Commit | Line | Data |
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b43d65f7 | 1 | /* |
b43d65f7 LW |
2 | * A driver for the ARM PL022 PrimeCell SSP/SPI bus master. |
3 | * | |
aeef9915 | 4 | * Copyright (C) 2008-2012 ST-Ericsson AB |
b43d65f7 LW |
5 | * Copyright (C) 2006 STMicroelectronics Pvt. Ltd. |
6 | * | |
7 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
8 | * | |
9 | * Initial version inspired by: | |
10 | * linux-2.6.17-rc3-mm1/drivers/spi/pxa2xx_spi.c | |
11 | * Initial adoption to PL022 by: | |
12 | * Sachin Verma <sachin.verma@st.com> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | */ | |
24 | ||
b43d65f7 LW |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/ioport.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/spi/spi.h> | |
b43d65f7 LW |
32 | #include <linux/delay.h> |
33 | #include <linux/clk.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/amba/bus.h> | |
36 | #include <linux/amba/pl022.h> | |
37 | #include <linux/io.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
b1b6b9aa LW |
39 | #include <linux/dmaengine.h> |
40 | #include <linux/dma-mapping.h> | |
41 | #include <linux/scatterlist.h> | |
bcda6ff8 | 42 | #include <linux/pm_runtime.h> |
f6f46de1 | 43 | #include <linux/gpio.h> |
6d3952a7 | 44 | #include <linux/of_gpio.h> |
4f5e1b37 | 45 | #include <linux/pinctrl/consumer.h> |
b43d65f7 LW |
46 | |
47 | /* | |
48 | * This macro is used to define some register default values. | |
49 | * reg is masked with mask, the OR:ed with an (again masked) | |
50 | * val shifted sb steps to the left. | |
51 | */ | |
52 | #define SSP_WRITE_BITS(reg, val, mask, sb) \ | |
53 | ((reg) = (((reg) & ~(mask)) | (((val)<<(sb)) & (mask)))) | |
54 | ||
55 | /* | |
56 | * This macro is also used to define some default values. | |
57 | * It will just shift val by sb steps to the left and mask | |
58 | * the result with mask. | |
59 | */ | |
60 | #define GEN_MASK_BITS(val, mask, sb) \ | |
61 | (((val)<<(sb)) & (mask)) | |
62 | ||
63 | #define DRIVE_TX 0 | |
64 | #define DO_NOT_DRIVE_TX 1 | |
65 | ||
66 | #define DO_NOT_QUEUE_DMA 0 | |
67 | #define QUEUE_DMA 1 | |
68 | ||
69 | #define RX_TRANSFER 1 | |
70 | #define TX_TRANSFER 2 | |
71 | ||
72 | /* | |
73 | * Macros to access SSP Registers with their offsets | |
74 | */ | |
75 | #define SSP_CR0(r) (r + 0x000) | |
76 | #define SSP_CR1(r) (r + 0x004) | |
77 | #define SSP_DR(r) (r + 0x008) | |
78 | #define SSP_SR(r) (r + 0x00C) | |
79 | #define SSP_CPSR(r) (r + 0x010) | |
80 | #define SSP_IMSC(r) (r + 0x014) | |
81 | #define SSP_RIS(r) (r + 0x018) | |
82 | #define SSP_MIS(r) (r + 0x01C) | |
83 | #define SSP_ICR(r) (r + 0x020) | |
84 | #define SSP_DMACR(r) (r + 0x024) | |
db4fa45e | 85 | #define SSP_CSR(r) (r + 0x030) /* vendor extension */ |
b43d65f7 LW |
86 | #define SSP_ITCR(r) (r + 0x080) |
87 | #define SSP_ITIP(r) (r + 0x084) | |
88 | #define SSP_ITOP(r) (r + 0x088) | |
89 | #define SSP_TDR(r) (r + 0x08C) | |
90 | ||
91 | #define SSP_PID0(r) (r + 0xFE0) | |
92 | #define SSP_PID1(r) (r + 0xFE4) | |
93 | #define SSP_PID2(r) (r + 0xFE8) | |
94 | #define SSP_PID3(r) (r + 0xFEC) | |
95 | ||
96 | #define SSP_CID0(r) (r + 0xFF0) | |
97 | #define SSP_CID1(r) (r + 0xFF4) | |
98 | #define SSP_CID2(r) (r + 0xFF8) | |
99 | #define SSP_CID3(r) (r + 0xFFC) | |
100 | ||
101 | /* | |
102 | * SSP Control Register 0 - SSP_CR0 | |
103 | */ | |
556f4aeb LW |
104 | #define SSP_CR0_MASK_DSS (0x0FUL << 0) |
105 | #define SSP_CR0_MASK_FRF (0x3UL << 4) | |
b43d65f7 LW |
106 | #define SSP_CR0_MASK_SPO (0x1UL << 6) |
107 | #define SSP_CR0_MASK_SPH (0x1UL << 7) | |
108 | #define SSP_CR0_MASK_SCR (0xFFUL << 8) | |
556f4aeb LW |
109 | |
110 | /* | |
111 | * The ST version of this block moves som bits | |
112 | * in SSP_CR0 and extends it to 32 bits | |
113 | */ | |
114 | #define SSP_CR0_MASK_DSS_ST (0x1FUL << 0) | |
115 | #define SSP_CR0_MASK_HALFDUP_ST (0x1UL << 5) | |
116 | #define SSP_CR0_MASK_CSS_ST (0x1FUL << 16) | |
117 | #define SSP_CR0_MASK_FRF_ST (0x3UL << 21) | |
118 | ||
b43d65f7 LW |
119 | /* |
120 | * SSP Control Register 0 - SSP_CR1 | |
121 | */ | |
122 | #define SSP_CR1_MASK_LBM (0x1UL << 0) | |
123 | #define SSP_CR1_MASK_SSE (0x1UL << 1) | |
124 | #define SSP_CR1_MASK_MS (0x1UL << 2) | |
125 | #define SSP_CR1_MASK_SOD (0x1UL << 3) | |
b43d65f7 LW |
126 | |
127 | /* | |
556f4aeb LW |
128 | * The ST version of this block adds some bits |
129 | * in SSP_CR1 | |
b43d65f7 | 130 | */ |
556f4aeb LW |
131 | #define SSP_CR1_MASK_RENDN_ST (0x1UL << 4) |
132 | #define SSP_CR1_MASK_TENDN_ST (0x1UL << 5) | |
133 | #define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6) | |
134 | #define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7) | |
135 | #define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10) | |
781c7b12 LW |
136 | /* This one is only in the PL023 variant */ |
137 | #define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13) | |
b43d65f7 LW |
138 | |
139 | /* | |
140 | * SSP Status Register - SSP_SR | |
141 | */ | |
142 | #define SSP_SR_MASK_TFE (0x1UL << 0) /* Transmit FIFO empty */ | |
143 | #define SSP_SR_MASK_TNF (0x1UL << 1) /* Transmit FIFO not full */ | |
144 | #define SSP_SR_MASK_RNE (0x1UL << 2) /* Receive FIFO not empty */ | |
556f4aeb | 145 | #define SSP_SR_MASK_RFF (0x1UL << 3) /* Receive FIFO full */ |
b43d65f7 LW |
146 | #define SSP_SR_MASK_BSY (0x1UL << 4) /* Busy Flag */ |
147 | ||
148 | /* | |
149 | * SSP Clock Prescale Register - SSP_CPSR | |
150 | */ | |
151 | #define SSP_CPSR_MASK_CPSDVSR (0xFFUL << 0) | |
152 | ||
153 | /* | |
154 | * SSP Interrupt Mask Set/Clear Register - SSP_IMSC | |
155 | */ | |
156 | #define SSP_IMSC_MASK_RORIM (0x1UL << 0) /* Receive Overrun Interrupt mask */ | |
157 | #define SSP_IMSC_MASK_RTIM (0x1UL << 1) /* Receive timeout Interrupt mask */ | |
158 | #define SSP_IMSC_MASK_RXIM (0x1UL << 2) /* Receive FIFO Interrupt mask */ | |
159 | #define SSP_IMSC_MASK_TXIM (0x1UL << 3) /* Transmit FIFO Interrupt mask */ | |
160 | ||
161 | /* | |
162 | * SSP Raw Interrupt Status Register - SSP_RIS | |
163 | */ | |
164 | /* Receive Overrun Raw Interrupt status */ | |
165 | #define SSP_RIS_MASK_RORRIS (0x1UL << 0) | |
166 | /* Receive Timeout Raw Interrupt status */ | |
167 | #define SSP_RIS_MASK_RTRIS (0x1UL << 1) | |
168 | /* Receive FIFO Raw Interrupt status */ | |
169 | #define SSP_RIS_MASK_RXRIS (0x1UL << 2) | |
170 | /* Transmit FIFO Raw Interrupt status */ | |
171 | #define SSP_RIS_MASK_TXRIS (0x1UL << 3) | |
172 | ||
173 | /* | |
174 | * SSP Masked Interrupt Status Register - SSP_MIS | |
175 | */ | |
176 | /* Receive Overrun Masked Interrupt status */ | |
177 | #define SSP_MIS_MASK_RORMIS (0x1UL << 0) | |
178 | /* Receive Timeout Masked Interrupt status */ | |
179 | #define SSP_MIS_MASK_RTMIS (0x1UL << 1) | |
180 | /* Receive FIFO Masked Interrupt status */ | |
181 | #define SSP_MIS_MASK_RXMIS (0x1UL << 2) | |
182 | /* Transmit FIFO Masked Interrupt status */ | |
183 | #define SSP_MIS_MASK_TXMIS (0x1UL << 3) | |
184 | ||
185 | /* | |
186 | * SSP Interrupt Clear Register - SSP_ICR | |
187 | */ | |
188 | /* Receive Overrun Raw Clear Interrupt bit */ | |
189 | #define SSP_ICR_MASK_RORIC (0x1UL << 0) | |
190 | /* Receive Timeout Clear Interrupt bit */ | |
191 | #define SSP_ICR_MASK_RTIC (0x1UL << 1) | |
192 | ||
193 | /* | |
194 | * SSP DMA Control Register - SSP_DMACR | |
195 | */ | |
196 | /* Receive DMA Enable bit */ | |
197 | #define SSP_DMACR_MASK_RXDMAE (0x1UL << 0) | |
198 | /* Transmit DMA Enable bit */ | |
199 | #define SSP_DMACR_MASK_TXDMAE (0x1UL << 1) | |
200 | ||
db4fa45e AB |
201 | /* |
202 | * SSP Chip Select Control Register - SSP_CSR | |
203 | * (vendor extension) | |
204 | */ | |
205 | #define SSP_CSR_CSVALUE_MASK (0x1FUL << 0) | |
206 | ||
b43d65f7 LW |
207 | /* |
208 | * SSP Integration Test control Register - SSP_ITCR | |
209 | */ | |
210 | #define SSP_ITCR_MASK_ITEN (0x1UL << 0) | |
211 | #define SSP_ITCR_MASK_TESTFIFO (0x1UL << 1) | |
212 | ||
213 | /* | |
214 | * SSP Integration Test Input Register - SSP_ITIP | |
215 | */ | |
216 | #define ITIP_MASK_SSPRXD (0x1UL << 0) | |
217 | #define ITIP_MASK_SSPFSSIN (0x1UL << 1) | |
218 | #define ITIP_MASK_SSPCLKIN (0x1UL << 2) | |
219 | #define ITIP_MASK_RXDMAC (0x1UL << 3) | |
220 | #define ITIP_MASK_TXDMAC (0x1UL << 4) | |
221 | #define ITIP_MASK_SSPTXDIN (0x1UL << 5) | |
222 | ||
223 | /* | |
224 | * SSP Integration Test output Register - SSP_ITOP | |
225 | */ | |
226 | #define ITOP_MASK_SSPTXD (0x1UL << 0) | |
227 | #define ITOP_MASK_SSPFSSOUT (0x1UL << 1) | |
228 | #define ITOP_MASK_SSPCLKOUT (0x1UL << 2) | |
229 | #define ITOP_MASK_SSPOEn (0x1UL << 3) | |
230 | #define ITOP_MASK_SSPCTLOEn (0x1UL << 4) | |
231 | #define ITOP_MASK_RORINTR (0x1UL << 5) | |
232 | #define ITOP_MASK_RTINTR (0x1UL << 6) | |
233 | #define ITOP_MASK_RXINTR (0x1UL << 7) | |
234 | #define ITOP_MASK_TXINTR (0x1UL << 8) | |
235 | #define ITOP_MASK_INTR (0x1UL << 9) | |
236 | #define ITOP_MASK_RXDMABREQ (0x1UL << 10) | |
237 | #define ITOP_MASK_RXDMASREQ (0x1UL << 11) | |
238 | #define ITOP_MASK_TXDMABREQ (0x1UL << 12) | |
239 | #define ITOP_MASK_TXDMASREQ (0x1UL << 13) | |
240 | ||
241 | /* | |
242 | * SSP Test Data Register - SSP_TDR | |
243 | */ | |
556f4aeb | 244 | #define TDR_MASK_TESTDATA (0xFFFFFFFF) |
b43d65f7 LW |
245 | |
246 | /* | |
247 | * Message State | |
248 | * we use the spi_message.state (void *) pointer to | |
249 | * hold a single state value, that's why all this | |
250 | * (void *) casting is done here. | |
251 | */ | |
556f4aeb LW |
252 | #define STATE_START ((void *) 0) |
253 | #define STATE_RUNNING ((void *) 1) | |
254 | #define STATE_DONE ((void *) 2) | |
255 | #define STATE_ERROR ((void *) -1) | |
b43d65f7 | 256 | |
b43d65f7 LW |
257 | /* |
258 | * SSP State - Whether Enabled or Disabled | |
259 | */ | |
556f4aeb LW |
260 | #define SSP_DISABLED (0) |
261 | #define SSP_ENABLED (1) | |
b43d65f7 LW |
262 | |
263 | /* | |
264 | * SSP DMA State - Whether DMA Enabled or Disabled | |
265 | */ | |
556f4aeb LW |
266 | #define SSP_DMA_DISABLED (0) |
267 | #define SSP_DMA_ENABLED (1) | |
b43d65f7 LW |
268 | |
269 | /* | |
270 | * SSP Clock Defaults | |
271 | */ | |
556f4aeb LW |
272 | #define SSP_DEFAULT_CLKRATE 0x2 |
273 | #define SSP_DEFAULT_PRESCALE 0x40 | |
b43d65f7 LW |
274 | |
275 | /* | |
276 | * SSP Clock Parameter ranges | |
277 | */ | |
278 | #define CPSDVR_MIN 0x02 | |
279 | #define CPSDVR_MAX 0xFE | |
280 | #define SCR_MIN 0x00 | |
281 | #define SCR_MAX 0xFF | |
282 | ||
283 | /* | |
284 | * SSP Interrupt related Macros | |
285 | */ | |
286 | #define DEFAULT_SSP_REG_IMSC 0x0UL | |
287 | #define DISABLE_ALL_INTERRUPTS DEFAULT_SSP_REG_IMSC | |
85fa4e1f AS |
288 | #define ENABLE_ALL_INTERRUPTS ( \ |
289 | SSP_IMSC_MASK_RORIM | \ | |
290 | SSP_IMSC_MASK_RTIM | \ | |
291 | SSP_IMSC_MASK_RXIM | \ | |
292 | SSP_IMSC_MASK_TXIM \ | |
293 | ) | |
b43d65f7 LW |
294 | |
295 | #define CLEAR_ALL_INTERRUPTS 0x3 | |
296 | ||
a18c266f MT |
297 | #define SPI_POLLING_TIMEOUT 1000 |
298 | ||
b43d65f7 LW |
299 | /* |
300 | * The type of reading going on on this chip | |
301 | */ | |
302 | enum ssp_reading { | |
303 | READING_NULL, | |
304 | READING_U8, | |
305 | READING_U16, | |
306 | READING_U32 | |
307 | }; | |
308 | ||
309 | /** | |
310 | * The type of writing going on on this chip | |
311 | */ | |
312 | enum ssp_writing { | |
313 | WRITING_NULL, | |
314 | WRITING_U8, | |
315 | WRITING_U16, | |
316 | WRITING_U32 | |
317 | }; | |
318 | ||
319 | /** | |
320 | * struct vendor_data - vendor-specific config parameters | |
321 | * for PL022 derivates | |
322 | * @fifodepth: depth of FIFOs (both) | |
323 | * @max_bpw: maximum number of bits per word | |
324 | * @unidir: supports unidirection transfers | |
556f4aeb LW |
325 | * @extended_cr: 32 bit wide control register 0 with extra |
326 | * features and extra features in CR1 as found in the ST variants | |
781c7b12 | 327 | * @pl023: supports a subset of the ST extensions called "PL023" |
db4fa45e | 328 | * @internal_cs_ctrl: supports chip select control register |
b43d65f7 LW |
329 | */ |
330 | struct vendor_data { | |
331 | int fifodepth; | |
332 | int max_bpw; | |
333 | bool unidir; | |
556f4aeb | 334 | bool extended_cr; |
781c7b12 | 335 | bool pl023; |
06fb01fd | 336 | bool loopback; |
db4fa45e | 337 | bool internal_cs_ctrl; |
b43d65f7 LW |
338 | }; |
339 | ||
340 | /** | |
341 | * struct pl022 - This is the private SSP driver data structure | |
342 | * @adev: AMBA device model hookup | |
12e8b325 LW |
343 | * @vendor: vendor data for the IP block |
344 | * @phybase: the physical memory where the SSP device resides | |
345 | * @virtbase: the virtual memory where the SSP is mapped | |
346 | * @clk: outgoing clock "SPICLK" for the SPI bus | |
b43d65f7 LW |
347 | * @master: SPI framework hookup |
348 | * @master_info: controller-specific data from machine setup | |
b43d65f7 LW |
349 | * @pump_transfers: Tasklet used in Interrupt Transfer mode |
350 | * @cur_msg: Pointer to current spi_message being processed | |
351 | * @cur_transfer: Pointer to current spi_transfer | |
352 | * @cur_chip: pointer to current clients chip(assigned from controller_state) | |
8b8d7191 VS |
353 | * @next_msg_cs_active: the next message in the queue has been examined |
354 | * and it was found that it uses the same chip select as the previous | |
355 | * message, so we left it active after the previous transfer, and it's | |
356 | * active already. | |
b43d65f7 LW |
357 | * @tx: current position in TX buffer to be read |
358 | * @tx_end: end position in TX buffer to be read | |
359 | * @rx: current position in RX buffer to be written | |
360 | * @rx_end: end position in RX buffer to be written | |
12e8b325 LW |
361 | * @read: the type of read currently going on |
362 | * @write: the type of write currently going on | |
363 | * @exp_fifo_level: expected FIFO level | |
364 | * @dma_rx_channel: optional channel for RX DMA | |
365 | * @dma_tx_channel: optional channel for TX DMA | |
366 | * @sgt_rx: scattertable for the RX transfer | |
367 | * @sgt_tx: scattertable for the TX transfer | |
368 | * @dummypage: a dummy page used for driving data on the bus with DMA | |
f6f46de1 RS |
369 | * @cur_cs: current chip select (gpio) |
370 | * @chipselects: list of chipselects (gpios) | |
b43d65f7 LW |
371 | */ |
372 | struct pl022 { | |
373 | struct amba_device *adev; | |
374 | struct vendor_data *vendor; | |
375 | resource_size_t phybase; | |
376 | void __iomem *virtbase; | |
377 | struct clk *clk; | |
378 | struct spi_master *master; | |
379 | struct pl022_ssp_controller *master_info; | |
ffbbdd21 | 380 | /* Message per-transfer pump */ |
b43d65f7 LW |
381 | struct tasklet_struct pump_transfers; |
382 | struct spi_message *cur_msg; | |
383 | struct spi_transfer *cur_transfer; | |
384 | struct chip_data *cur_chip; | |
8b8d7191 | 385 | bool next_msg_cs_active; |
b43d65f7 LW |
386 | void *tx; |
387 | void *tx_end; | |
388 | void *rx; | |
389 | void *rx_end; | |
390 | enum ssp_reading read; | |
391 | enum ssp_writing write; | |
fc05475f | 392 | u32 exp_fifo_level; |
083be3f0 LW |
393 | enum ssp_rx_level_trig rx_lev_trig; |
394 | enum ssp_tx_level_trig tx_lev_trig; | |
b1b6b9aa LW |
395 | /* DMA settings */ |
396 | #ifdef CONFIG_DMA_ENGINE | |
397 | struct dma_chan *dma_rx_channel; | |
398 | struct dma_chan *dma_tx_channel; | |
399 | struct sg_table sgt_rx; | |
400 | struct sg_table sgt_tx; | |
401 | char *dummypage; | |
ffbbdd21 | 402 | bool dma_running; |
b1b6b9aa | 403 | #endif |
f6f46de1 RS |
404 | int cur_cs; |
405 | int *chipselects; | |
b43d65f7 LW |
406 | }; |
407 | ||
408 | /** | |
409 | * struct chip_data - To maintain runtime state of SSP for each client chip | |
556f4aeb LW |
410 | * @cr0: Value of control register CR0 of SSP - on later ST variants this |
411 | * register is 32 bits wide rather than just 16 | |
b43d65f7 LW |
412 | * @cr1: Value of control register CR1 of SSP |
413 | * @dmacr: Value of DMA control Register of SSP | |
414 | * @cpsr: Value of Clock prescale register | |
415 | * @n_bytes: how many bytes(power of 2) reqd for a given data width of client | |
416 | * @enable_dma: Whether to enable DMA or not | |
b43d65f7 | 417 | * @read: function ptr to be used to read when doing xfer for this chip |
12e8b325 | 418 | * @write: function ptr to be used to write when doing xfer for this chip |
b43d65f7 LW |
419 | * @cs_control: chip select callback provided by chip |
420 | * @xfer_type: polling/interrupt/DMA | |
421 | * | |
422 | * Runtime state of the SSP controller, maintained per chip, | |
423 | * This would be set according to the current message that would be served | |
424 | */ | |
425 | struct chip_data { | |
556f4aeb | 426 | u32 cr0; |
b43d65f7 LW |
427 | u16 cr1; |
428 | u16 dmacr; | |
429 | u16 cpsr; | |
430 | u8 n_bytes; | |
b1b6b9aa | 431 | bool enable_dma; |
b43d65f7 LW |
432 | enum ssp_reading read; |
433 | enum ssp_writing write; | |
434 | void (*cs_control) (u32 command); | |
435 | int xfer_type; | |
436 | }; | |
437 | ||
438 | /** | |
439 | * null_cs_control - Dummy chip select function | |
440 | * @command: select/delect the chip | |
441 | * | |
442 | * If no chip select function is provided by client this is used as dummy | |
443 | * chip select | |
444 | */ | |
445 | static void null_cs_control(u32 command) | |
446 | { | |
447 | pr_debug("pl022: dummy chip select control, CS=0x%x\n", command); | |
448 | } | |
449 | ||
db4fa45e AB |
450 | /** |
451 | * internal_cs_control - Control chip select signals via SSP_CSR. | |
452 | * @pl022: SSP driver private data structure | |
453 | * @command: select/delect the chip | |
454 | * | |
455 | * Used on controller with internal chip select control via SSP_CSR register | |
456 | * (vendor extension). Each of the 5 LSB in the register controls one chip | |
457 | * select signal. | |
458 | */ | |
459 | static void internal_cs_control(struct pl022 *pl022, u32 command) | |
460 | { | |
461 | u32 tmp; | |
462 | ||
463 | tmp = readw(SSP_CSR(pl022->virtbase)); | |
464 | if (command == SSP_CHIP_SELECT) | |
465 | tmp &= ~BIT(pl022->cur_cs); | |
466 | else | |
467 | tmp |= BIT(pl022->cur_cs); | |
468 | writew(tmp, SSP_CSR(pl022->virtbase)); | |
469 | } | |
470 | ||
f6f46de1 RS |
471 | static void pl022_cs_control(struct pl022 *pl022, u32 command) |
472 | { | |
db4fa45e AB |
473 | if (pl022->vendor->internal_cs_ctrl) |
474 | internal_cs_control(pl022, command); | |
475 | else if (gpio_is_valid(pl022->cur_cs)) | |
f6f46de1 RS |
476 | gpio_set_value(pl022->cur_cs, command); |
477 | else | |
478 | pl022->cur_chip->cs_control(command); | |
479 | } | |
480 | ||
b43d65f7 LW |
481 | /** |
482 | * giveback - current spi_message is over, schedule next message and call | |
483 | * callback of this message. Assumes that caller already | |
484 | * set message->status; dma and pio irqs are blocked | |
485 | * @pl022: SSP driver private data structure | |
486 | */ | |
487 | static void giveback(struct pl022 *pl022) | |
488 | { | |
489 | struct spi_transfer *last_transfer; | |
8b8d7191 | 490 | pl022->next_msg_cs_active = false; |
b43d65f7 | 491 | |
23e2c2aa AL |
492 | last_transfer = list_last_entry(&pl022->cur_msg->transfers, |
493 | struct spi_transfer, transfer_list); | |
b43d65f7 LW |
494 | |
495 | /* Delay if requested before any change in chip select */ | |
496 | if (last_transfer->delay_usecs) | |
497 | /* | |
498 | * FIXME: This runs in interrupt context. | |
499 | * Is this really smart? | |
500 | */ | |
501 | udelay(last_transfer->delay_usecs); | |
502 | ||
8b8d7191 | 503 | if (!last_transfer->cs_change) { |
b43d65f7 LW |
504 | struct spi_message *next_msg; |
505 | ||
8b8d7191 VS |
506 | /* |
507 | * cs_change was not set. We can keep the chip select | |
508 | * enabled if there is message in the queue and it is | |
509 | * for the same spi device. | |
b43d65f7 LW |
510 | * |
511 | * We cannot postpone this until pump_messages, because | |
512 | * after calling msg->complete (below) the driver that | |
513 | * sent the current message could be unloaded, which | |
514 | * could invalidate the cs_control() callback... | |
515 | */ | |
b43d65f7 | 516 | /* get a pointer to the next message, if any */ |
ffbbdd21 | 517 | next_msg = spi_get_next_queued_message(pl022->master); |
b43d65f7 | 518 | |
8b8d7191 VS |
519 | /* |
520 | * see if the next and current messages point | |
521 | * to the same spi device. | |
b43d65f7 | 522 | */ |
8b8d7191 | 523 | if (next_msg && next_msg->spi != pl022->cur_msg->spi) |
b43d65f7 | 524 | next_msg = NULL; |
8b8d7191 | 525 | if (!next_msg || pl022->cur_msg->state == STATE_ERROR) |
f6f46de1 | 526 | pl022_cs_control(pl022, SSP_CHIP_DESELECT); |
8b8d7191 VS |
527 | else |
528 | pl022->next_msg_cs_active = true; | |
ffbbdd21 | 529 | |
b43d65f7 | 530 | } |
8b8d7191 | 531 | |
8b8d7191 VS |
532 | pl022->cur_msg = NULL; |
533 | pl022->cur_transfer = NULL; | |
534 | pl022->cur_chip = NULL; | |
fd316941 VS |
535 | |
536 | /* disable the SPI/SSP operation */ | |
537 | writew((readw(SSP_CR1(pl022->virtbase)) & | |
538 | (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); | |
539 | ||
cd6fa8d2 | 540 | spi_finalize_current_message(pl022->master); |
b43d65f7 LW |
541 | } |
542 | ||
543 | /** | |
544 | * flush - flush the FIFO to reach a clean state | |
545 | * @pl022: SSP driver private data structure | |
546 | */ | |
547 | static int flush(struct pl022 *pl022) | |
548 | { | |
549 | unsigned long limit = loops_per_jiffy << 1; | |
550 | ||
551 | dev_dbg(&pl022->adev->dev, "flush\n"); | |
552 | do { | |
553 | while (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
554 | readw(SSP_DR(pl022->virtbase)); | |
555 | } while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_BSY) && limit--); | |
fc05475f LW |
556 | |
557 | pl022->exp_fifo_level = 0; | |
558 | ||
b43d65f7 LW |
559 | return limit; |
560 | } | |
561 | ||
562 | /** | |
563 | * restore_state - Load configuration of current chip | |
564 | * @pl022: SSP driver private data structure | |
565 | */ | |
566 | static void restore_state(struct pl022 *pl022) | |
567 | { | |
568 | struct chip_data *chip = pl022->cur_chip; | |
569 | ||
556f4aeb LW |
570 | if (pl022->vendor->extended_cr) |
571 | writel(chip->cr0, SSP_CR0(pl022->virtbase)); | |
572 | else | |
573 | writew(chip->cr0, SSP_CR0(pl022->virtbase)); | |
b43d65f7 LW |
574 | writew(chip->cr1, SSP_CR1(pl022->virtbase)); |
575 | writew(chip->dmacr, SSP_DMACR(pl022->virtbase)); | |
576 | writew(chip->cpsr, SSP_CPSR(pl022->virtbase)); | |
577 | writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); | |
578 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
579 | } | |
580 | ||
b43d65f7 LW |
581 | /* |
582 | * Default SSP Register Values | |
583 | */ | |
584 | #define DEFAULT_SSP_REG_CR0 ( \ | |
585 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS, 0) | \ | |
556f4aeb LW |
586 | GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF, 4) | \ |
587 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ | |
588 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ | |
589 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ | |
590 | ) | |
591 | ||
592 | /* ST versions have slightly different bit layout */ | |
593 | #define DEFAULT_SSP_REG_CR0_ST ( \ | |
594 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ | |
595 | GEN_MASK_BITS(SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, SSP_CR0_MASK_HALFDUP_ST, 5) | \ | |
b43d65f7 | 596 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ |
ee2b805c | 597 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ |
556f4aeb LW |
598 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) | \ |
599 | GEN_MASK_BITS(SSP_BITS_8, SSP_CR0_MASK_CSS_ST, 16) | \ | |
600 | GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \ | |
b43d65f7 LW |
601 | ) |
602 | ||
781c7b12 LW |
603 | /* The PL023 version is slightly different again */ |
604 | #define DEFAULT_SSP_REG_CR0_ST_PL023 ( \ | |
605 | GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \ | |
606 | GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \ | |
607 | GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \ | |
608 | GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \ | |
609 | ) | |
610 | ||
b43d65f7 LW |
611 | #define DEFAULT_SSP_REG_CR1 ( \ |
612 | GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \ | |
613 | GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ | |
614 | GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ | |
556f4aeb | 615 | GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) \ |
b43d65f7 LW |
616 | ) |
617 | ||
556f4aeb LW |
618 | /* ST versions extend this register to use all 16 bits */ |
619 | #define DEFAULT_SSP_REG_CR1_ST ( \ | |
620 | DEFAULT_SSP_REG_CR1 | \ | |
621 | GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ | |
622 | GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ | |
623 | GEN_MASK_BITS(SSP_MWIRE_WAIT_ZERO, SSP_CR1_MASK_MWAIT_ST, 6) |\ | |
624 | GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ | |
625 | GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \ | |
626 | ) | |
627 | ||
781c7b12 LW |
628 | /* |
629 | * The PL023 variant has further differences: no loopback mode, no microwire | |
630 | * support, and a new clock feedback delay setting. | |
631 | */ | |
632 | #define DEFAULT_SSP_REG_CR1_ST_PL023 ( \ | |
633 | GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \ | |
634 | GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \ | |
635 | GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \ | |
636 | GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \ | |
637 | GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \ | |
638 | GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \ | |
639 | GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \ | |
640 | GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \ | |
641 | ) | |
556f4aeb | 642 | |
b43d65f7 | 643 | #define DEFAULT_SSP_REG_CPSR ( \ |
556f4aeb | 644 | GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \ |
b43d65f7 LW |
645 | ) |
646 | ||
647 | #define DEFAULT_SSP_REG_DMACR (\ | |
648 | GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_RXDMAE, 0) | \ | |
649 | GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \ | |
650 | ) | |
651 | ||
781c7b12 LW |
652 | /** |
653 | * load_ssp_default_config - Load default configuration for SSP | |
654 | * @pl022: SSP driver private data structure | |
655 | */ | |
b43d65f7 LW |
656 | static void load_ssp_default_config(struct pl022 *pl022) |
657 | { | |
781c7b12 LW |
658 | if (pl022->vendor->pl023) { |
659 | writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase)); | |
660 | writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase)); | |
661 | } else if (pl022->vendor->extended_cr) { | |
556f4aeb LW |
662 | writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase)); |
663 | writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase)); | |
664 | } else { | |
665 | writew(DEFAULT_SSP_REG_CR0, SSP_CR0(pl022->virtbase)); | |
666 | writew(DEFAULT_SSP_REG_CR1, SSP_CR1(pl022->virtbase)); | |
667 | } | |
b43d65f7 LW |
668 | writew(DEFAULT_SSP_REG_DMACR, SSP_DMACR(pl022->virtbase)); |
669 | writew(DEFAULT_SSP_REG_CPSR, SSP_CPSR(pl022->virtbase)); | |
670 | writew(DISABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase)); | |
671 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
672 | } | |
673 | ||
674 | /** | |
675 | * This will write to TX and read from RX according to the parameters | |
676 | * set in pl022. | |
677 | */ | |
678 | static void readwriter(struct pl022 *pl022) | |
679 | { | |
680 | ||
681 | /* | |
25985edc | 682 | * The FIFO depth is different between primecell variants. |
b43d65f7 LW |
683 | * I believe filling in too much in the FIFO might cause |
684 | * errons in 8bit wide transfers on ARM variants (just 8 words | |
685 | * FIFO, means only 8x8 = 64 bits in FIFO) at least. | |
686 | * | |
fc05475f LW |
687 | * To prevent this issue, the TX FIFO is only filled to the |
688 | * unused RX FIFO fill length, regardless of what the TX | |
689 | * FIFO status flag indicates. | |
b43d65f7 LW |
690 | */ |
691 | dev_dbg(&pl022->adev->dev, | |
692 | "%s, rx: %p, rxend: %p, tx: %p, txend: %p\n", | |
693 | __func__, pl022->rx, pl022->rx_end, pl022->tx, pl022->tx_end); | |
694 | ||
695 | /* Read as much as you can */ | |
696 | while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
697 | && (pl022->rx < pl022->rx_end)) { | |
698 | switch (pl022->read) { | |
699 | case READING_NULL: | |
700 | readw(SSP_DR(pl022->virtbase)); | |
701 | break; | |
702 | case READING_U8: | |
703 | *(u8 *) (pl022->rx) = | |
704 | readw(SSP_DR(pl022->virtbase)) & 0xFFU; | |
705 | break; | |
706 | case READING_U16: | |
707 | *(u16 *) (pl022->rx) = | |
708 | (u16) readw(SSP_DR(pl022->virtbase)); | |
709 | break; | |
710 | case READING_U32: | |
711 | *(u32 *) (pl022->rx) = | |
712 | readl(SSP_DR(pl022->virtbase)); | |
713 | break; | |
714 | } | |
715 | pl022->rx += (pl022->cur_chip->n_bytes); | |
fc05475f | 716 | pl022->exp_fifo_level--; |
b43d65f7 LW |
717 | } |
718 | /* | |
fc05475f | 719 | * Write as much as possible up to the RX FIFO size |
b43d65f7 | 720 | */ |
fc05475f | 721 | while ((pl022->exp_fifo_level < pl022->vendor->fifodepth) |
b43d65f7 LW |
722 | && (pl022->tx < pl022->tx_end)) { |
723 | switch (pl022->write) { | |
724 | case WRITING_NULL: | |
725 | writew(0x0, SSP_DR(pl022->virtbase)); | |
726 | break; | |
727 | case WRITING_U8: | |
728 | writew(*(u8 *) (pl022->tx), SSP_DR(pl022->virtbase)); | |
729 | break; | |
730 | case WRITING_U16: | |
731 | writew((*(u16 *) (pl022->tx)), SSP_DR(pl022->virtbase)); | |
732 | break; | |
733 | case WRITING_U32: | |
734 | writel(*(u32 *) (pl022->tx), SSP_DR(pl022->virtbase)); | |
735 | break; | |
736 | } | |
737 | pl022->tx += (pl022->cur_chip->n_bytes); | |
fc05475f | 738 | pl022->exp_fifo_level++; |
b43d65f7 LW |
739 | /* |
740 | * This inner reader takes care of things appearing in the RX | |
741 | * FIFO as we're transmitting. This will happen a lot since the | |
742 | * clock starts running when you put things into the TX FIFO, | |
25985edc | 743 | * and then things are continuously clocked into the RX FIFO. |
b43d65f7 LW |
744 | */ |
745 | while ((readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RNE) | |
746 | && (pl022->rx < pl022->rx_end)) { | |
747 | switch (pl022->read) { | |
748 | case READING_NULL: | |
749 | readw(SSP_DR(pl022->virtbase)); | |
750 | break; | |
751 | case READING_U8: | |
752 | *(u8 *) (pl022->rx) = | |
753 | readw(SSP_DR(pl022->virtbase)) & 0xFFU; | |
754 | break; | |
755 | case READING_U16: | |
756 | *(u16 *) (pl022->rx) = | |
757 | (u16) readw(SSP_DR(pl022->virtbase)); | |
758 | break; | |
759 | case READING_U32: | |
760 | *(u32 *) (pl022->rx) = | |
761 | readl(SSP_DR(pl022->virtbase)); | |
762 | break; | |
763 | } | |
764 | pl022->rx += (pl022->cur_chip->n_bytes); | |
fc05475f | 765 | pl022->exp_fifo_level--; |
b43d65f7 LW |
766 | } |
767 | } | |
768 | /* | |
769 | * When we exit here the TX FIFO should be full and the RX FIFO | |
770 | * should be empty | |
771 | */ | |
772 | } | |
773 | ||
b43d65f7 LW |
774 | /** |
775 | * next_transfer - Move to the Next transfer in the current spi message | |
776 | * @pl022: SSP driver private data structure | |
777 | * | |
778 | * This function moves though the linked list of spi transfers in the | |
779 | * current spi message and returns with the state of current spi | |
780 | * message i.e whether its last transfer is done(STATE_DONE) or | |
781 | * Next transfer is ready(STATE_RUNNING) | |
782 | */ | |
783 | static void *next_transfer(struct pl022 *pl022) | |
784 | { | |
785 | struct spi_message *msg = pl022->cur_msg; | |
786 | struct spi_transfer *trans = pl022->cur_transfer; | |
787 | ||
788 | /* Move to next transfer */ | |
789 | if (trans->transfer_list.next != &msg->transfers) { | |
790 | pl022->cur_transfer = | |
791 | list_entry(trans->transfer_list.next, | |
792 | struct spi_transfer, transfer_list); | |
793 | return STATE_RUNNING; | |
794 | } | |
795 | return STATE_DONE; | |
796 | } | |
b1b6b9aa LW |
797 | |
798 | /* | |
799 | * This DMA functionality is only compiled in if we have | |
800 | * access to the generic DMA devices/DMA engine. | |
801 | */ | |
802 | #ifdef CONFIG_DMA_ENGINE | |
803 | static void unmap_free_dma_scatter(struct pl022 *pl022) | |
804 | { | |
805 | /* Unmap and free the SG tables */ | |
b7298896 | 806 | dma_unmap_sg(pl022->dma_tx_channel->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa | 807 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
b7298896 | 808 | dma_unmap_sg(pl022->dma_rx_channel->device->dev, pl022->sgt_rx.sgl, |
b1b6b9aa LW |
809 | pl022->sgt_rx.nents, DMA_FROM_DEVICE); |
810 | sg_free_table(&pl022->sgt_rx); | |
811 | sg_free_table(&pl022->sgt_tx); | |
812 | } | |
813 | ||
814 | static void dma_callback(void *data) | |
815 | { | |
816 | struct pl022 *pl022 = data; | |
817 | struct spi_message *msg = pl022->cur_msg; | |
818 | ||
819 | BUG_ON(!pl022->sgt_rx.sgl); | |
820 | ||
821 | #ifdef VERBOSE_DEBUG | |
822 | /* | |
823 | * Optionally dump out buffers to inspect contents, this is | |
824 | * good if you want to convince yourself that the loopback | |
825 | * read/write contents are the same, when adopting to a new | |
826 | * DMA engine. | |
827 | */ | |
828 | { | |
829 | struct scatterlist *sg; | |
830 | unsigned int i; | |
831 | ||
832 | dma_sync_sg_for_cpu(&pl022->adev->dev, | |
833 | pl022->sgt_rx.sgl, | |
834 | pl022->sgt_rx.nents, | |
835 | DMA_FROM_DEVICE); | |
836 | ||
837 | for_each_sg(pl022->sgt_rx.sgl, sg, pl022->sgt_rx.nents, i) { | |
838 | dev_dbg(&pl022->adev->dev, "SPI RX SG ENTRY: %d", i); | |
839 | print_hex_dump(KERN_ERR, "SPI RX: ", | |
840 | DUMP_PREFIX_OFFSET, | |
841 | 16, | |
842 | 1, | |
843 | sg_virt(sg), | |
844 | sg_dma_len(sg), | |
845 | 1); | |
846 | } | |
847 | for_each_sg(pl022->sgt_tx.sgl, sg, pl022->sgt_tx.nents, i) { | |
848 | dev_dbg(&pl022->adev->dev, "SPI TX SG ENTRY: %d", i); | |
849 | print_hex_dump(KERN_ERR, "SPI TX: ", | |
850 | DUMP_PREFIX_OFFSET, | |
851 | 16, | |
852 | 1, | |
853 | sg_virt(sg), | |
854 | sg_dma_len(sg), | |
855 | 1); | |
856 | } | |
857 | } | |
858 | #endif | |
859 | ||
860 | unmap_free_dma_scatter(pl022); | |
861 | ||
25985edc | 862 | /* Update total bytes transferred */ |
b1b6b9aa LW |
863 | msg->actual_length += pl022->cur_transfer->len; |
864 | if (pl022->cur_transfer->cs_change) | |
f6f46de1 | 865 | pl022_cs_control(pl022, SSP_CHIP_DESELECT); |
b1b6b9aa LW |
866 | |
867 | /* Move to next transfer */ | |
868 | msg->state = next_transfer(pl022); | |
869 | tasklet_schedule(&pl022->pump_transfers); | |
870 | } | |
871 | ||
872 | static void setup_dma_scatter(struct pl022 *pl022, | |
873 | void *buffer, | |
874 | unsigned int length, | |
875 | struct sg_table *sgtab) | |
876 | { | |
877 | struct scatterlist *sg; | |
878 | int bytesleft = length; | |
879 | void *bufp = buffer; | |
880 | int mapbytes; | |
881 | int i; | |
882 | ||
883 | if (buffer) { | |
884 | for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { | |
885 | /* | |
886 | * If there are less bytes left than what fits | |
887 | * in the current page (plus page alignment offset) | |
888 | * we just feed in this, else we stuff in as much | |
889 | * as we can. | |
890 | */ | |
891 | if (bytesleft < (PAGE_SIZE - offset_in_page(bufp))) | |
892 | mapbytes = bytesleft; | |
893 | else | |
894 | mapbytes = PAGE_SIZE - offset_in_page(bufp); | |
895 | sg_set_page(sg, virt_to_page(bufp), | |
896 | mapbytes, offset_in_page(bufp)); | |
897 | bufp += mapbytes; | |
898 | bytesleft -= mapbytes; | |
899 | dev_dbg(&pl022->adev->dev, | |
900 | "set RX/TX target page @ %p, %d bytes, %d left\n", | |
901 | bufp, mapbytes, bytesleft); | |
902 | } | |
903 | } else { | |
904 | /* Map the dummy buffer on every page */ | |
905 | for_each_sg(sgtab->sgl, sg, sgtab->nents, i) { | |
906 | if (bytesleft < PAGE_SIZE) | |
907 | mapbytes = bytesleft; | |
908 | else | |
909 | mapbytes = PAGE_SIZE; | |
910 | sg_set_page(sg, virt_to_page(pl022->dummypage), | |
911 | mapbytes, 0); | |
912 | bytesleft -= mapbytes; | |
913 | dev_dbg(&pl022->adev->dev, | |
914 | "set RX/TX to dummy page %d bytes, %d left\n", | |
915 | mapbytes, bytesleft); | |
916 | ||
917 | } | |
918 | } | |
919 | BUG_ON(bytesleft); | |
920 | } | |
921 | ||
922 | /** | |
923 | * configure_dma - configures the channels for the next transfer | |
924 | * @pl022: SSP driver's private data structure | |
925 | */ | |
926 | static int configure_dma(struct pl022 *pl022) | |
927 | { | |
928 | struct dma_slave_config rx_conf = { | |
929 | .src_addr = SSP_DR(pl022->phybase), | |
a485df4b | 930 | .direction = DMA_DEV_TO_MEM, |
258aea76 | 931 | .device_fc = false, |
b1b6b9aa LW |
932 | }; |
933 | struct dma_slave_config tx_conf = { | |
934 | .dst_addr = SSP_DR(pl022->phybase), | |
a485df4b | 935 | .direction = DMA_MEM_TO_DEV, |
258aea76 | 936 | .device_fc = false, |
b1b6b9aa LW |
937 | }; |
938 | unsigned int pages; | |
939 | int ret; | |
082086f2 | 940 | int rx_sglen, tx_sglen; |
b1b6b9aa LW |
941 | struct dma_chan *rxchan = pl022->dma_rx_channel; |
942 | struct dma_chan *txchan = pl022->dma_tx_channel; | |
943 | struct dma_async_tx_descriptor *rxdesc; | |
944 | struct dma_async_tx_descriptor *txdesc; | |
b1b6b9aa LW |
945 | |
946 | /* Check that the channels are available */ | |
947 | if (!rxchan || !txchan) | |
948 | return -ENODEV; | |
949 | ||
083be3f0 LW |
950 | /* |
951 | * If supplied, the DMA burstsize should equal the FIFO trigger level. | |
952 | * Notice that the DMA engine uses one-to-one mapping. Since we can | |
953 | * not trigger on 2 elements this needs explicit mapping rather than | |
954 | * calculation. | |
955 | */ | |
956 | switch (pl022->rx_lev_trig) { | |
957 | case SSP_RX_1_OR_MORE_ELEM: | |
958 | rx_conf.src_maxburst = 1; | |
959 | break; | |
960 | case SSP_RX_4_OR_MORE_ELEM: | |
961 | rx_conf.src_maxburst = 4; | |
962 | break; | |
963 | case SSP_RX_8_OR_MORE_ELEM: | |
964 | rx_conf.src_maxburst = 8; | |
965 | break; | |
966 | case SSP_RX_16_OR_MORE_ELEM: | |
967 | rx_conf.src_maxburst = 16; | |
968 | break; | |
969 | case SSP_RX_32_OR_MORE_ELEM: | |
970 | rx_conf.src_maxburst = 32; | |
971 | break; | |
972 | default: | |
973 | rx_conf.src_maxburst = pl022->vendor->fifodepth >> 1; | |
974 | break; | |
975 | } | |
976 | ||
977 | switch (pl022->tx_lev_trig) { | |
978 | case SSP_TX_1_OR_MORE_EMPTY_LOC: | |
979 | tx_conf.dst_maxburst = 1; | |
980 | break; | |
981 | case SSP_TX_4_OR_MORE_EMPTY_LOC: | |
982 | tx_conf.dst_maxburst = 4; | |
983 | break; | |
984 | case SSP_TX_8_OR_MORE_EMPTY_LOC: | |
985 | tx_conf.dst_maxburst = 8; | |
986 | break; | |
987 | case SSP_TX_16_OR_MORE_EMPTY_LOC: | |
988 | tx_conf.dst_maxburst = 16; | |
989 | break; | |
990 | case SSP_TX_32_OR_MORE_EMPTY_LOC: | |
991 | tx_conf.dst_maxburst = 32; | |
992 | break; | |
993 | default: | |
994 | tx_conf.dst_maxburst = pl022->vendor->fifodepth >> 1; | |
995 | break; | |
996 | } | |
997 | ||
b1b6b9aa LW |
998 | switch (pl022->read) { |
999 | case READING_NULL: | |
1000 | /* Use the same as for writing */ | |
1001 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
1002 | break; | |
1003 | case READING_U8: | |
1004 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1005 | break; | |
1006 | case READING_U16: | |
1007 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
1008 | break; | |
1009 | case READING_U32: | |
1010 | rx_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | switch (pl022->write) { | |
1015 | case WRITING_NULL: | |
1016 | /* Use the same as for reading */ | |
1017 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; | |
1018 | break; | |
1019 | case WRITING_U8: | |
1020 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
1021 | break; | |
1022 | case WRITING_U16: | |
1023 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
1024 | break; | |
1025 | case WRITING_U32: | |
bc3f67a3 | 1026 | tx_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
b1b6b9aa LW |
1027 | break; |
1028 | } | |
1029 | ||
1030 | /* SPI pecularity: we need to read and write the same width */ | |
1031 | if (rx_conf.src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
1032 | rx_conf.src_addr_width = tx_conf.dst_addr_width; | |
1033 | if (tx_conf.dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
1034 | tx_conf.dst_addr_width = rx_conf.src_addr_width; | |
1035 | BUG_ON(rx_conf.src_addr_width != tx_conf.dst_addr_width); | |
1036 | ||
ecd442fd LW |
1037 | dmaengine_slave_config(rxchan, &rx_conf); |
1038 | dmaengine_slave_config(txchan, &tx_conf); | |
b1b6b9aa LW |
1039 | |
1040 | /* Create sglists for the transfers */ | |
b181565e | 1041 | pages = DIV_ROUND_UP(pl022->cur_transfer->len, PAGE_SIZE); |
b1b6b9aa LW |
1042 | dev_dbg(&pl022->adev->dev, "using %d pages for transfer\n", pages); |
1043 | ||
538a18dc | 1044 | ret = sg_alloc_table(&pl022->sgt_rx, pages, GFP_ATOMIC); |
b1b6b9aa LW |
1045 | if (ret) |
1046 | goto err_alloc_rx_sg; | |
1047 | ||
538a18dc | 1048 | ret = sg_alloc_table(&pl022->sgt_tx, pages, GFP_ATOMIC); |
b1b6b9aa LW |
1049 | if (ret) |
1050 | goto err_alloc_tx_sg; | |
1051 | ||
1052 | /* Fill in the scatterlists for the RX+TX buffers */ | |
1053 | setup_dma_scatter(pl022, pl022->rx, | |
1054 | pl022->cur_transfer->len, &pl022->sgt_rx); | |
1055 | setup_dma_scatter(pl022, pl022->tx, | |
1056 | pl022->cur_transfer->len, &pl022->sgt_tx); | |
1057 | ||
1058 | /* Map DMA buffers */ | |
082086f2 | 1059 | rx_sglen = dma_map_sg(rxchan->device->dev, pl022->sgt_rx.sgl, |
b1b6b9aa | 1060 | pl022->sgt_rx.nents, DMA_FROM_DEVICE); |
082086f2 | 1061 | if (!rx_sglen) |
b1b6b9aa LW |
1062 | goto err_rx_sgmap; |
1063 | ||
082086f2 | 1064 | tx_sglen = dma_map_sg(txchan->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa | 1065 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
082086f2 | 1066 | if (!tx_sglen) |
b1b6b9aa LW |
1067 | goto err_tx_sgmap; |
1068 | ||
1069 | /* Send both scatterlists */ | |
16052827 | 1070 | rxdesc = dmaengine_prep_slave_sg(rxchan, |
b1b6b9aa | 1071 | pl022->sgt_rx.sgl, |
082086f2 | 1072 | rx_sglen, |
a485df4b | 1073 | DMA_DEV_TO_MEM, |
b1b6b9aa LW |
1074 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1075 | if (!rxdesc) | |
1076 | goto err_rxdesc; | |
1077 | ||
16052827 | 1078 | txdesc = dmaengine_prep_slave_sg(txchan, |
b1b6b9aa | 1079 | pl022->sgt_tx.sgl, |
082086f2 | 1080 | tx_sglen, |
a485df4b | 1081 | DMA_MEM_TO_DEV, |
b1b6b9aa LW |
1082 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1083 | if (!txdesc) | |
1084 | goto err_txdesc; | |
1085 | ||
1086 | /* Put the callback on the RX transfer only, that should finish last */ | |
1087 | rxdesc->callback = dma_callback; | |
1088 | rxdesc->callback_param = pl022; | |
1089 | ||
1090 | /* Submit and fire RX and TX with TX last so we're ready to read! */ | |
ecd442fd LW |
1091 | dmaengine_submit(rxdesc); |
1092 | dmaengine_submit(txdesc); | |
1093 | dma_async_issue_pending(rxchan); | |
1094 | dma_async_issue_pending(txchan); | |
ffbbdd21 | 1095 | pl022->dma_running = true; |
b1b6b9aa LW |
1096 | |
1097 | return 0; | |
1098 | ||
b1b6b9aa | 1099 | err_txdesc: |
ecd442fd | 1100 | dmaengine_terminate_all(txchan); |
b1b6b9aa | 1101 | err_rxdesc: |
ecd442fd | 1102 | dmaengine_terminate_all(rxchan); |
b7298896 | 1103 | dma_unmap_sg(txchan->device->dev, pl022->sgt_tx.sgl, |
b1b6b9aa LW |
1104 | pl022->sgt_tx.nents, DMA_TO_DEVICE); |
1105 | err_tx_sgmap: | |
b7298896 | 1106 | dma_unmap_sg(rxchan->device->dev, pl022->sgt_rx.sgl, |
3ffa6158 | 1107 | pl022->sgt_rx.nents, DMA_FROM_DEVICE); |
b1b6b9aa LW |
1108 | err_rx_sgmap: |
1109 | sg_free_table(&pl022->sgt_tx); | |
1110 | err_alloc_tx_sg: | |
1111 | sg_free_table(&pl022->sgt_rx); | |
1112 | err_alloc_rx_sg: | |
1113 | return -ENOMEM; | |
1114 | } | |
1115 | ||
fd4a319b | 1116 | static int pl022_dma_probe(struct pl022 *pl022) |
b1b6b9aa LW |
1117 | { |
1118 | dma_cap_mask_t mask; | |
1119 | ||
1120 | /* Try to acquire a generic DMA engine slave channel */ | |
1121 | dma_cap_zero(mask); | |
1122 | dma_cap_set(DMA_SLAVE, mask); | |
1123 | /* | |
1124 | * We need both RX and TX channels to do DMA, else do none | |
1125 | * of them. | |
1126 | */ | |
1127 | pl022->dma_rx_channel = dma_request_channel(mask, | |
1128 | pl022->master_info->dma_filter, | |
1129 | pl022->master_info->dma_rx_param); | |
1130 | if (!pl022->dma_rx_channel) { | |
43c64015 | 1131 | dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n"); |
b1b6b9aa LW |
1132 | goto err_no_rxchan; |
1133 | } | |
1134 | ||
1135 | pl022->dma_tx_channel = dma_request_channel(mask, | |
1136 | pl022->master_info->dma_filter, | |
1137 | pl022->master_info->dma_tx_param); | |
1138 | if (!pl022->dma_tx_channel) { | |
43c64015 | 1139 | dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n"); |
b1b6b9aa LW |
1140 | goto err_no_txchan; |
1141 | } | |
1142 | ||
1143 | pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
77538f4a | 1144 | if (!pl022->dummypage) |
b1b6b9aa | 1145 | goto err_no_dummypage; |
b1b6b9aa LW |
1146 | |
1147 | dev_info(&pl022->adev->dev, "setup for DMA on RX %s, TX %s\n", | |
1148 | dma_chan_name(pl022->dma_rx_channel), | |
1149 | dma_chan_name(pl022->dma_tx_channel)); | |
1150 | ||
1151 | return 0; | |
1152 | ||
1153 | err_no_dummypage: | |
1154 | dma_release_channel(pl022->dma_tx_channel); | |
1155 | err_no_txchan: | |
1156 | dma_release_channel(pl022->dma_rx_channel); | |
1157 | pl022->dma_rx_channel = NULL; | |
1158 | err_no_rxchan: | |
43c64015 VK |
1159 | dev_err(&pl022->adev->dev, |
1160 | "Failed to work in dma mode, work without dma!\n"); | |
b1b6b9aa LW |
1161 | return -ENODEV; |
1162 | } | |
1163 | ||
dc715452 AB |
1164 | static int pl022_dma_autoprobe(struct pl022 *pl022) |
1165 | { | |
1166 | struct device *dev = &pl022->adev->dev; | |
f3d4bb33 RV |
1167 | struct dma_chan *chan; |
1168 | int err; | |
dc715452 AB |
1169 | |
1170 | /* automatically configure DMA channels from platform, normally using DT */ | |
f3d4bb33 RV |
1171 | chan = dma_request_slave_channel_reason(dev, "rx"); |
1172 | if (IS_ERR(chan)) { | |
1173 | err = PTR_ERR(chan); | |
dc715452 | 1174 | goto err_no_rxchan; |
f3d4bb33 RV |
1175 | } |
1176 | ||
1177 | pl022->dma_rx_channel = chan; | |
dc715452 | 1178 | |
f3d4bb33 RV |
1179 | chan = dma_request_slave_channel_reason(dev, "tx"); |
1180 | if (IS_ERR(chan)) { | |
1181 | err = PTR_ERR(chan); | |
dc715452 | 1182 | goto err_no_txchan; |
f3d4bb33 RV |
1183 | } |
1184 | ||
1185 | pl022->dma_tx_channel = chan; | |
dc715452 AB |
1186 | |
1187 | pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
f3d4bb33 RV |
1188 | if (!pl022->dummypage) { |
1189 | err = -ENOMEM; | |
dc715452 | 1190 | goto err_no_dummypage; |
f3d4bb33 | 1191 | } |
dc715452 AB |
1192 | |
1193 | return 0; | |
1194 | ||
1195 | err_no_dummypage: | |
1196 | dma_release_channel(pl022->dma_tx_channel); | |
1197 | pl022->dma_tx_channel = NULL; | |
1198 | err_no_txchan: | |
1199 | dma_release_channel(pl022->dma_rx_channel); | |
1200 | pl022->dma_rx_channel = NULL; | |
1201 | err_no_rxchan: | |
f3d4bb33 | 1202 | return err; |
dc715452 AB |
1203 | } |
1204 | ||
b1b6b9aa LW |
1205 | static void terminate_dma(struct pl022 *pl022) |
1206 | { | |
1207 | struct dma_chan *rxchan = pl022->dma_rx_channel; | |
1208 | struct dma_chan *txchan = pl022->dma_tx_channel; | |
1209 | ||
ecd442fd LW |
1210 | dmaengine_terminate_all(rxchan); |
1211 | dmaengine_terminate_all(txchan); | |
b1b6b9aa | 1212 | unmap_free_dma_scatter(pl022); |
ffbbdd21 | 1213 | pl022->dma_running = false; |
b1b6b9aa LW |
1214 | } |
1215 | ||
1216 | static void pl022_dma_remove(struct pl022 *pl022) | |
1217 | { | |
ffbbdd21 | 1218 | if (pl022->dma_running) |
b1b6b9aa LW |
1219 | terminate_dma(pl022); |
1220 | if (pl022->dma_tx_channel) | |
1221 | dma_release_channel(pl022->dma_tx_channel); | |
1222 | if (pl022->dma_rx_channel) | |
1223 | dma_release_channel(pl022->dma_rx_channel); | |
1224 | kfree(pl022->dummypage); | |
1225 | } | |
1226 | ||
1227 | #else | |
1228 | static inline int configure_dma(struct pl022 *pl022) | |
1229 | { | |
1230 | return -ENODEV; | |
1231 | } | |
1232 | ||
dc715452 AB |
1233 | static inline int pl022_dma_autoprobe(struct pl022 *pl022) |
1234 | { | |
1235 | return 0; | |
1236 | } | |
1237 | ||
b1b6b9aa LW |
1238 | static inline int pl022_dma_probe(struct pl022 *pl022) |
1239 | { | |
1240 | return 0; | |
1241 | } | |
1242 | ||
1243 | static inline void pl022_dma_remove(struct pl022 *pl022) | |
1244 | { | |
1245 | } | |
1246 | #endif | |
1247 | ||
b43d65f7 LW |
1248 | /** |
1249 | * pl022_interrupt_handler - Interrupt handler for SSP controller | |
1250 | * | |
1251 | * This function handles interrupts generated for an interrupt based transfer. | |
1252 | * If a receive overrun (ROR) interrupt is there then we disable SSP, flag the | |
1253 | * current message's state as STATE_ERROR and schedule the tasklet | |
1254 | * pump_transfers which will do the postprocessing of the current message by | |
1255 | * calling giveback(). Otherwise it reads data from RX FIFO till there is no | |
1256 | * more data, and writes data in TX FIFO till it is not full. If we complete | |
1257 | * the transfer we move to the next transfer and schedule the tasklet. | |
1258 | */ | |
1259 | static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id) | |
1260 | { | |
1261 | struct pl022 *pl022 = dev_id; | |
1262 | struct spi_message *msg = pl022->cur_msg; | |
1263 | u16 irq_status = 0; | |
b43d65f7 LW |
1264 | |
1265 | if (unlikely(!msg)) { | |
1266 | dev_err(&pl022->adev->dev, | |
1267 | "bad message state in interrupt handler"); | |
1268 | /* Never fail */ | |
1269 | return IRQ_HANDLED; | |
1270 | } | |
1271 | ||
1272 | /* Read the Interrupt Status Register */ | |
1273 | irq_status = readw(SSP_MIS(pl022->virtbase)); | |
1274 | ||
1275 | if (unlikely(!irq_status)) | |
1276 | return IRQ_NONE; | |
1277 | ||
b1b6b9aa LW |
1278 | /* |
1279 | * This handles the FIFO interrupts, the timeout | |
1280 | * interrupts are flatly ignored, they cannot be | |
1281 | * trusted. | |
1282 | */ | |
b43d65f7 LW |
1283 | if (unlikely(irq_status & SSP_MIS_MASK_RORMIS)) { |
1284 | /* | |
1285 | * Overrun interrupt - bail out since our Data has been | |
1286 | * corrupted | |
1287 | */ | |
b1b6b9aa | 1288 | dev_err(&pl022->adev->dev, "FIFO overrun\n"); |
b43d65f7 LW |
1289 | if (readw(SSP_SR(pl022->virtbase)) & SSP_SR_MASK_RFF) |
1290 | dev_err(&pl022->adev->dev, | |
1291 | "RXFIFO is full\n"); | |
b43d65f7 LW |
1292 | |
1293 | /* | |
1294 | * Disable and clear interrupts, disable SSP, | |
1295 | * mark message with bad status so it can be | |
1296 | * retried. | |
1297 | */ | |
1298 | writew(DISABLE_ALL_INTERRUPTS, | |
1299 | SSP_IMSC(pl022->virtbase)); | |
1300 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
1301 | writew((readw(SSP_CR1(pl022->virtbase)) & | |
1302 | (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); | |
1303 | msg->state = STATE_ERROR; | |
1304 | ||
1305 | /* Schedule message queue handler */ | |
1306 | tasklet_schedule(&pl022->pump_transfers); | |
1307 | return IRQ_HANDLED; | |
1308 | } | |
1309 | ||
1310 | readwriter(pl022); | |
1311 | ||
7183d1eb | 1312 | if (pl022->tx == pl022->tx_end) { |
172289df CB |
1313 | /* Disable Transmit interrupt, enable receive interrupt */ |
1314 | writew((readw(SSP_IMSC(pl022->virtbase)) & | |
1315 | ~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM, | |
b43d65f7 LW |
1316 | SSP_IMSC(pl022->virtbase)); |
1317 | } | |
1318 | ||
1319 | /* | |
1320 | * Since all transactions must write as much as shall be read, | |
1321 | * we can conclude the entire transaction once RX is complete. | |
1322 | * At this point, all TX will always be finished. | |
1323 | */ | |
1324 | if (pl022->rx >= pl022->rx_end) { | |
1325 | writew(DISABLE_ALL_INTERRUPTS, | |
1326 | SSP_IMSC(pl022->virtbase)); | |
1327 | writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase)); | |
1328 | if (unlikely(pl022->rx > pl022->rx_end)) { | |
1329 | dev_warn(&pl022->adev->dev, "read %u surplus " | |
1330 | "bytes (did you request an odd " | |
1331 | "number of bytes on a 16bit bus?)\n", | |
1332 | (u32) (pl022->rx - pl022->rx_end)); | |
1333 | } | |
25985edc | 1334 | /* Update total bytes transferred */ |
b43d65f7 LW |
1335 | msg->actual_length += pl022->cur_transfer->len; |
1336 | if (pl022->cur_transfer->cs_change) | |
f6f46de1 | 1337 | pl022_cs_control(pl022, SSP_CHIP_DESELECT); |
b43d65f7 LW |
1338 | /* Move to next transfer */ |
1339 | msg->state = next_transfer(pl022); | |
1340 | tasklet_schedule(&pl022->pump_transfers); | |
1341 | return IRQ_HANDLED; | |
1342 | } | |
1343 | ||
1344 | return IRQ_HANDLED; | |
1345 | } | |
1346 | ||
1347 | /** | |
1348 | * This sets up the pointers to memory for the next message to | |
1349 | * send out on the SPI bus. | |
1350 | */ | |
1351 | static int set_up_next_transfer(struct pl022 *pl022, | |
1352 | struct spi_transfer *transfer) | |
1353 | { | |
1354 | int residue; | |
1355 | ||
1356 | /* Sanity check the message for this bus width */ | |
1357 | residue = pl022->cur_transfer->len % pl022->cur_chip->n_bytes; | |
1358 | if (unlikely(residue != 0)) { | |
1359 | dev_err(&pl022->adev->dev, | |
1360 | "message of %u bytes to transmit but the current " | |
1361 | "chip bus has a data width of %u bytes!\n", | |
1362 | pl022->cur_transfer->len, | |
1363 | pl022->cur_chip->n_bytes); | |
1364 | dev_err(&pl022->adev->dev, "skipping this message\n"); | |
1365 | return -EIO; | |
1366 | } | |
1367 | pl022->tx = (void *)transfer->tx_buf; | |
1368 | pl022->tx_end = pl022->tx + pl022->cur_transfer->len; | |
1369 | pl022->rx = (void *)transfer->rx_buf; | |
1370 | pl022->rx_end = pl022->rx + pl022->cur_transfer->len; | |
1371 | pl022->write = | |
1372 | pl022->tx ? pl022->cur_chip->write : WRITING_NULL; | |
1373 | pl022->read = pl022->rx ? pl022->cur_chip->read : READING_NULL; | |
1374 | return 0; | |
1375 | } | |
1376 | ||
1377 | /** | |
b1b6b9aa LW |
1378 | * pump_transfers - Tasklet function which schedules next transfer |
1379 | * when running in interrupt or DMA transfer mode. | |
b43d65f7 LW |
1380 | * @data: SSP driver private data structure |
1381 | * | |
1382 | */ | |
1383 | static void pump_transfers(unsigned long data) | |
1384 | { | |
1385 | struct pl022 *pl022 = (struct pl022 *) data; | |
1386 | struct spi_message *message = NULL; | |
1387 | struct spi_transfer *transfer = NULL; | |
1388 | struct spi_transfer *previous = NULL; | |
1389 | ||
1390 | /* Get current state information */ | |
1391 | message = pl022->cur_msg; | |
1392 | transfer = pl022->cur_transfer; | |
1393 | ||
1394 | /* Handle for abort */ | |
1395 | if (message->state == STATE_ERROR) { | |
1396 | message->status = -EIO; | |
1397 | giveback(pl022); | |
1398 | return; | |
1399 | } | |
1400 | ||
1401 | /* Handle end of message */ | |
1402 | if (message->state == STATE_DONE) { | |
1403 | message->status = 0; | |
1404 | giveback(pl022); | |
1405 | return; | |
1406 | } | |
1407 | ||
1408 | /* Delay if requested at end of transfer before CS change */ | |
1409 | if (message->state == STATE_RUNNING) { | |
1410 | previous = list_entry(transfer->transfer_list.prev, | |
1411 | struct spi_transfer, | |
1412 | transfer_list); | |
1413 | if (previous->delay_usecs) | |
1414 | /* | |
1415 | * FIXME: This runs in interrupt context. | |
1416 | * Is this really smart? | |
1417 | */ | |
1418 | udelay(previous->delay_usecs); | |
1419 | ||
8b8d7191 | 1420 | /* Reselect chip select only if cs_change was requested */ |
b43d65f7 | 1421 | if (previous->cs_change) |
f6f46de1 | 1422 | pl022_cs_control(pl022, SSP_CHIP_SELECT); |
b43d65f7 LW |
1423 | } else { |
1424 | /* STATE_START */ | |
1425 | message->state = STATE_RUNNING; | |
1426 | } | |
1427 | ||
1428 | if (set_up_next_transfer(pl022, transfer)) { | |
1429 | message->state = STATE_ERROR; | |
1430 | message->status = -EIO; | |
1431 | giveback(pl022); | |
1432 | return; | |
1433 | } | |
1434 | /* Flush the FIFOs and let's go! */ | |
1435 | flush(pl022); | |
b43d65f7 | 1436 | |
b1b6b9aa LW |
1437 | if (pl022->cur_chip->enable_dma) { |
1438 | if (configure_dma(pl022)) { | |
1439 | dev_dbg(&pl022->adev->dev, | |
1440 | "configuration of DMA failed, fall back to interrupt mode\n"); | |
1441 | goto err_config_dma; | |
1442 | } | |
b43d65f7 LW |
1443 | return; |
1444 | } | |
b43d65f7 | 1445 | |
b1b6b9aa | 1446 | err_config_dma: |
172289df CB |
1447 | /* enable all interrupts except RX */ |
1448 | writew(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM, SSP_IMSC(pl022->virtbase)); | |
b43d65f7 LW |
1449 | } |
1450 | ||
b1b6b9aa | 1451 | static void do_interrupt_dma_transfer(struct pl022 *pl022) |
b43d65f7 | 1452 | { |
172289df CB |
1453 | /* |
1454 | * Default is to enable all interrupts except RX - | |
1455 | * this will be enabled once TX is complete | |
1456 | */ | |
d555ea05 | 1457 | u32 irqflags = (u32)(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM); |
b43d65f7 | 1458 | |
8b8d7191 VS |
1459 | /* Enable target chip, if not already active */ |
1460 | if (!pl022->next_msg_cs_active) | |
f6f46de1 | 1461 | pl022_cs_control(pl022, SSP_CHIP_SELECT); |
b43d65f7 | 1462 | |
b43d65f7 LW |
1463 | if (set_up_next_transfer(pl022, pl022->cur_transfer)) { |
1464 | /* Error path */ | |
1465 | pl022->cur_msg->state = STATE_ERROR; | |
1466 | pl022->cur_msg->status = -EIO; | |
1467 | giveback(pl022); | |
1468 | return; | |
1469 | } | |
b1b6b9aa LW |
1470 | /* If we're using DMA, set up DMA here */ |
1471 | if (pl022->cur_chip->enable_dma) { | |
1472 | /* Configure DMA transfer */ | |
1473 | if (configure_dma(pl022)) { | |
1474 | dev_dbg(&pl022->adev->dev, | |
1475 | "configuration of DMA failed, fall back to interrupt mode\n"); | |
1476 | goto err_config_dma; | |
1477 | } | |
1478 | /* Disable interrupts in DMA mode, IRQ from DMA controller */ | |
1479 | irqflags = DISABLE_ALL_INTERRUPTS; | |
1480 | } | |
1481 | err_config_dma: | |
b43d65f7 LW |
1482 | /* Enable SSP, turn on interrupts */ |
1483 | writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), | |
1484 | SSP_CR1(pl022->virtbase)); | |
b1b6b9aa | 1485 | writew(irqflags, SSP_IMSC(pl022->virtbase)); |
b43d65f7 LW |
1486 | } |
1487 | ||
b1b6b9aa | 1488 | static void do_polling_transfer(struct pl022 *pl022) |
b43d65f7 | 1489 | { |
b43d65f7 LW |
1490 | struct spi_message *message = NULL; |
1491 | struct spi_transfer *transfer = NULL; | |
1492 | struct spi_transfer *previous = NULL; | |
1493 | struct chip_data *chip; | |
a18c266f | 1494 | unsigned long time, timeout; |
b43d65f7 LW |
1495 | |
1496 | chip = pl022->cur_chip; | |
1497 | message = pl022->cur_msg; | |
1498 | ||
1499 | while (message->state != STATE_DONE) { | |
1500 | /* Handle for abort */ | |
1501 | if (message->state == STATE_ERROR) | |
1502 | break; | |
1503 | transfer = pl022->cur_transfer; | |
1504 | ||
1505 | /* Delay if requested at end of transfer */ | |
1506 | if (message->state == STATE_RUNNING) { | |
1507 | previous = | |
1508 | list_entry(transfer->transfer_list.prev, | |
1509 | struct spi_transfer, transfer_list); | |
1510 | if (previous->delay_usecs) | |
1511 | udelay(previous->delay_usecs); | |
1512 | if (previous->cs_change) | |
f6f46de1 | 1513 | pl022_cs_control(pl022, SSP_CHIP_SELECT); |
b43d65f7 LW |
1514 | } else { |
1515 | /* STATE_START */ | |
1516 | message->state = STATE_RUNNING; | |
8b8d7191 | 1517 | if (!pl022->next_msg_cs_active) |
f6f46de1 | 1518 | pl022_cs_control(pl022, SSP_CHIP_SELECT); |
b43d65f7 LW |
1519 | } |
1520 | ||
1521 | /* Configuration Changing Per Transfer */ | |
1522 | if (set_up_next_transfer(pl022, transfer)) { | |
1523 | /* Error path */ | |
1524 | message->state = STATE_ERROR; | |
1525 | break; | |
1526 | } | |
1527 | /* Flush FIFOs and enable SSP */ | |
1528 | flush(pl022); | |
1529 | writew((readw(SSP_CR1(pl022->virtbase)) | SSP_CR1_MASK_SSE), | |
1530 | SSP_CR1(pl022->virtbase)); | |
1531 | ||
556f4aeb | 1532 | dev_dbg(&pl022->adev->dev, "polling transfer ongoing ...\n"); |
a18c266f MT |
1533 | |
1534 | timeout = jiffies + msecs_to_jiffies(SPI_POLLING_TIMEOUT); | |
1535 | while (pl022->tx < pl022->tx_end || pl022->rx < pl022->rx_end) { | |
1536 | time = jiffies; | |
b43d65f7 | 1537 | readwriter(pl022); |
a18c266f MT |
1538 | if (time_after(time, timeout)) { |
1539 | dev_warn(&pl022->adev->dev, | |
1540 | "%s: timeout!\n", __func__); | |
1541 | message->state = STATE_ERROR; | |
1542 | goto out; | |
1543 | } | |
521999bd | 1544 | cpu_relax(); |
a18c266f | 1545 | } |
b43d65f7 | 1546 | |
25985edc | 1547 | /* Update total byte transferred */ |
b43d65f7 LW |
1548 | message->actual_length += pl022->cur_transfer->len; |
1549 | if (pl022->cur_transfer->cs_change) | |
f6f46de1 | 1550 | pl022_cs_control(pl022, SSP_CHIP_DESELECT); |
b43d65f7 LW |
1551 | /* Move to next transfer */ |
1552 | message->state = next_transfer(pl022); | |
1553 | } | |
a18c266f | 1554 | out: |
b43d65f7 LW |
1555 | /* Handle end of message */ |
1556 | if (message->state == STATE_DONE) | |
1557 | message->status = 0; | |
1558 | else | |
1559 | message->status = -EIO; | |
1560 | ||
1561 | giveback(pl022); | |
1562 | return; | |
1563 | } | |
1564 | ||
ffbbdd21 LW |
1565 | static int pl022_transfer_one_message(struct spi_master *master, |
1566 | struct spi_message *msg) | |
b43d65f7 | 1567 | { |
ffbbdd21 | 1568 | struct pl022 *pl022 = spi_master_get_devdata(master); |
b43d65f7 LW |
1569 | |
1570 | /* Initial message state */ | |
ffbbdd21 LW |
1571 | pl022->cur_msg = msg; |
1572 | msg->state = STATE_START; | |
1573 | ||
1574 | pl022->cur_transfer = list_entry(msg->transfers.next, | |
1575 | struct spi_transfer, transfer_list); | |
b43d65f7 LW |
1576 | |
1577 | /* Setup the SPI using the per chip configuration */ | |
ffbbdd21 | 1578 | pl022->cur_chip = spi_get_ctldata(msg->spi); |
f6f46de1 | 1579 | pl022->cur_cs = pl022->chipselects[msg->spi->chip_select]; |
d4b6af2e | 1580 | |
b43d65f7 LW |
1581 | restore_state(pl022); |
1582 | flush(pl022); | |
1583 | ||
1584 | if (pl022->cur_chip->xfer_type == POLLING_TRANSFER) | |
1585 | do_polling_transfer(pl022); | |
b43d65f7 | 1586 | else |
b1b6b9aa | 1587 | do_interrupt_dma_transfer(pl022); |
b43d65f7 LW |
1588 | |
1589 | return 0; | |
1590 | } | |
1591 | ||
ffbbdd21 | 1592 | static int pl022_unprepare_transfer_hardware(struct spi_master *master) |
b43d65f7 | 1593 | { |
ffbbdd21 | 1594 | struct pl022 *pl022 = spi_master_get_devdata(master); |
b43d65f7 | 1595 | |
ffbbdd21 LW |
1596 | /* nothing more to do - disable spi/ssp and power off */ |
1597 | writew((readw(SSP_CR1(pl022->virtbase)) & | |
1598 | (~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase)); | |
b43d65f7 | 1599 | |
b43d65f7 LW |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | static int verify_controller_parameters(struct pl022 *pl022, | |
f9d629c7 | 1604 | struct pl022_config_chip const *chip_info) |
b43d65f7 | 1605 | { |
b43d65f7 LW |
1606 | if ((chip_info->iface < SSP_INTERFACE_MOTOROLA_SPI) |
1607 | || (chip_info->iface > SSP_INTERFACE_UNIDIRECTIONAL)) { | |
5a1c98be | 1608 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1609 | "interface is configured incorrectly\n"); |
1610 | return -EINVAL; | |
1611 | } | |
1612 | if ((chip_info->iface == SSP_INTERFACE_UNIDIRECTIONAL) && | |
1613 | (!pl022->vendor->unidir)) { | |
5a1c98be | 1614 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1615 | "unidirectional mode not supported in this " |
1616 | "hardware version\n"); | |
1617 | return -EINVAL; | |
1618 | } | |
1619 | if ((chip_info->hierarchy != SSP_MASTER) | |
1620 | && (chip_info->hierarchy != SSP_SLAVE)) { | |
5a1c98be | 1621 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1622 | "hierarchy is configured incorrectly\n"); |
1623 | return -EINVAL; | |
1624 | } | |
b43d65f7 LW |
1625 | if ((chip_info->com_mode != INTERRUPT_TRANSFER) |
1626 | && (chip_info->com_mode != DMA_TRANSFER) | |
1627 | && (chip_info->com_mode != POLLING_TRANSFER)) { | |
5a1c98be | 1628 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1629 | "Communication mode is configured incorrectly\n"); |
1630 | return -EINVAL; | |
1631 | } | |
78b2b911 LW |
1632 | switch (chip_info->rx_lev_trig) { |
1633 | case SSP_RX_1_OR_MORE_ELEM: | |
1634 | case SSP_RX_4_OR_MORE_ELEM: | |
1635 | case SSP_RX_8_OR_MORE_ELEM: | |
1636 | /* These are always OK, all variants can handle this */ | |
1637 | break; | |
1638 | case SSP_RX_16_OR_MORE_ELEM: | |
1639 | if (pl022->vendor->fifodepth < 16) { | |
1640 | dev_err(&pl022->adev->dev, | |
1641 | "RX FIFO Trigger Level is configured incorrectly\n"); | |
1642 | return -EINVAL; | |
1643 | } | |
1644 | break; | |
1645 | case SSP_RX_32_OR_MORE_ELEM: | |
1646 | if (pl022->vendor->fifodepth < 32) { | |
1647 | dev_err(&pl022->adev->dev, | |
1648 | "RX FIFO Trigger Level is configured incorrectly\n"); | |
1649 | return -EINVAL; | |
1650 | } | |
1651 | break; | |
1652 | default: | |
5a1c98be | 1653 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1654 | "RX FIFO Trigger Level is configured incorrectly\n"); |
1655 | return -EINVAL; | |
1656 | } | |
78b2b911 LW |
1657 | switch (chip_info->tx_lev_trig) { |
1658 | case SSP_TX_1_OR_MORE_EMPTY_LOC: | |
1659 | case SSP_TX_4_OR_MORE_EMPTY_LOC: | |
1660 | case SSP_TX_8_OR_MORE_EMPTY_LOC: | |
1661 | /* These are always OK, all variants can handle this */ | |
1662 | break; | |
1663 | case SSP_TX_16_OR_MORE_EMPTY_LOC: | |
1664 | if (pl022->vendor->fifodepth < 16) { | |
1665 | dev_err(&pl022->adev->dev, | |
1666 | "TX FIFO Trigger Level is configured incorrectly\n"); | |
1667 | return -EINVAL; | |
1668 | } | |
1669 | break; | |
1670 | case SSP_TX_32_OR_MORE_EMPTY_LOC: | |
1671 | if (pl022->vendor->fifodepth < 32) { | |
1672 | dev_err(&pl022->adev->dev, | |
1673 | "TX FIFO Trigger Level is configured incorrectly\n"); | |
1674 | return -EINVAL; | |
1675 | } | |
1676 | break; | |
1677 | default: | |
5a1c98be | 1678 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1679 | "TX FIFO Trigger Level is configured incorrectly\n"); |
1680 | return -EINVAL; | |
1681 | } | |
b43d65f7 LW |
1682 | if (chip_info->iface == SSP_INTERFACE_NATIONAL_MICROWIRE) { |
1683 | if ((chip_info->ctrl_len < SSP_BITS_4) | |
1684 | || (chip_info->ctrl_len > SSP_BITS_32)) { | |
5a1c98be | 1685 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1686 | "CTRL LEN is configured incorrectly\n"); |
1687 | return -EINVAL; | |
1688 | } | |
1689 | if ((chip_info->wait_state != SSP_MWIRE_WAIT_ZERO) | |
1690 | && (chip_info->wait_state != SSP_MWIRE_WAIT_ONE)) { | |
5a1c98be | 1691 | dev_err(&pl022->adev->dev, |
b43d65f7 LW |
1692 | "Wait State is configured incorrectly\n"); |
1693 | return -EINVAL; | |
1694 | } | |
556f4aeb LW |
1695 | /* Half duplex is only available in the ST Micro version */ |
1696 | if (pl022->vendor->extended_cr) { | |
1697 | if ((chip_info->duplex != | |
1698 | SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) | |
1699 | && (chip_info->duplex != | |
4a4fd471 | 1700 | SSP_MICROWIRE_CHANNEL_HALF_DUPLEX)) { |
5a1c98be | 1701 | dev_err(&pl022->adev->dev, |
556f4aeb LW |
1702 | "Microwire duplex mode is configured incorrectly\n"); |
1703 | return -EINVAL; | |
4a4fd471 | 1704 | } |
556f4aeb LW |
1705 | } else { |
1706 | if (chip_info->duplex != SSP_MICROWIRE_CHANNEL_FULL_DUPLEX) | |
5a1c98be | 1707 | dev_err(&pl022->adev->dev, |
556f4aeb LW |
1708 | "Microwire half duplex mode requested," |
1709 | " but this is only available in the" | |
1710 | " ST version of PL022\n"); | |
b43d65f7 LW |
1711 | return -EINVAL; |
1712 | } | |
1713 | } | |
b43d65f7 LW |
1714 | return 0; |
1715 | } | |
1716 | ||
0379b2a3 VK |
1717 | static inline u32 spi_rate(u32 rate, u16 cpsdvsr, u16 scr) |
1718 | { | |
1719 | return rate / (cpsdvsr * (1 + scr)); | |
1720 | } | |
1721 | ||
1722 | static int calculate_effective_freq(struct pl022 *pl022, int freq, struct | |
1723 | ssp_clock_params * clk_freq) | |
b43d65f7 LW |
1724 | { |
1725 | /* Lets calculate the frequency parameters */ | |
0379b2a3 VK |
1726 | u16 cpsdvsr = CPSDVR_MIN, scr = SCR_MIN; |
1727 | u32 rate, max_tclk, min_tclk, best_freq = 0, best_cpsdvsr = 0, | |
1728 | best_scr = 0, tmp, found = 0; | |
b43d65f7 LW |
1729 | |
1730 | rate = clk_get_rate(pl022->clk); | |
1731 | /* cpsdvscr = 2 & scr 0 */ | |
0379b2a3 | 1732 | max_tclk = spi_rate(rate, CPSDVR_MIN, SCR_MIN); |
b43d65f7 | 1733 | /* cpsdvsr = 254 & scr = 255 */ |
0379b2a3 VK |
1734 | min_tclk = spi_rate(rate, CPSDVR_MAX, SCR_MAX); |
1735 | ||
ea505bc9 VK |
1736 | if (freq > max_tclk) |
1737 | dev_warn(&pl022->adev->dev, | |
1738 | "Max speed that can be programmed is %d Hz, you requested %d\n", | |
1739 | max_tclk, freq); | |
1740 | ||
1741 | if (freq < min_tclk) { | |
b43d65f7 | 1742 | dev_err(&pl022->adev->dev, |
ea505bc9 VK |
1743 | "Requested frequency: %d Hz is less than minimum possible %d Hz\n", |
1744 | freq, min_tclk); | |
b43d65f7 LW |
1745 | return -EINVAL; |
1746 | } | |
0379b2a3 VK |
1747 | |
1748 | /* | |
1749 | * best_freq will give closest possible available rate (<= requested | |
1750 | * freq) for all values of scr & cpsdvsr. | |
1751 | */ | |
1752 | while ((cpsdvsr <= CPSDVR_MAX) && !found) { | |
1753 | while (scr <= SCR_MAX) { | |
1754 | tmp = spi_rate(rate, cpsdvsr, scr); | |
1755 | ||
5eb806a3 VK |
1756 | if (tmp > freq) { |
1757 | /* we need lower freq */ | |
0379b2a3 | 1758 | scr++; |
5eb806a3 VK |
1759 | continue; |
1760 | } | |
1761 | ||
0379b2a3 | 1762 | /* |
5eb806a3 VK |
1763 | * If found exact value, mark found and break. |
1764 | * If found more closer value, update and break. | |
0379b2a3 | 1765 | */ |
5eb806a3 | 1766 | if (tmp > best_freq) { |
0379b2a3 VK |
1767 | best_freq = tmp; |
1768 | best_cpsdvsr = cpsdvsr; | |
1769 | best_scr = scr; | |
1770 | ||
1771 | if (tmp == freq) | |
5eb806a3 | 1772 | found = 1; |
0379b2a3 | 1773 | } |
5eb806a3 VK |
1774 | /* |
1775 | * increased scr will give lower rates, which are not | |
1776 | * required | |
1777 | */ | |
1778 | break; | |
0379b2a3 VK |
1779 | } |
1780 | cpsdvsr += 2; | |
1781 | scr = SCR_MIN; | |
1782 | } | |
1783 | ||
5eb806a3 VK |
1784 | WARN(!best_freq, "pl022: Matching cpsdvsr and scr not found for %d Hz rate \n", |
1785 | freq); | |
1786 | ||
0379b2a3 VK |
1787 | clk_freq->cpsdvsr = (u8) (best_cpsdvsr & 0xFF); |
1788 | clk_freq->scr = (u8) (best_scr & 0xFF); | |
1789 | dev_dbg(&pl022->adev->dev, | |
1790 | "SSP Target Frequency is: %u, Effective Frequency is %u\n", | |
1791 | freq, best_freq); | |
1792 | dev_dbg(&pl022->adev->dev, "SSP cpsdvsr = %d, scr = %d\n", | |
1793 | clk_freq->cpsdvsr, clk_freq->scr); | |
1794 | ||
b43d65f7 LW |
1795 | return 0; |
1796 | } | |
1797 | ||
f9d629c7 LW |
1798 | /* |
1799 | * A piece of default chip info unless the platform | |
1800 | * supplies it. | |
1801 | */ | |
1802 | static const struct pl022_config_chip pl022_default_chip_info = { | |
1803 | .com_mode = POLLING_TRANSFER, | |
1804 | .iface = SSP_INTERFACE_MOTOROLA_SPI, | |
1805 | .hierarchy = SSP_SLAVE, | |
1806 | .slave_tx_disable = DO_NOT_DRIVE_TX, | |
1807 | .rx_lev_trig = SSP_RX_1_OR_MORE_ELEM, | |
1808 | .tx_lev_trig = SSP_TX_1_OR_MORE_EMPTY_LOC, | |
1809 | .ctrl_len = SSP_BITS_8, | |
1810 | .wait_state = SSP_MWIRE_WAIT_ZERO, | |
1811 | .duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX, | |
1812 | .cs_control = null_cs_control, | |
1813 | }; | |
1814 | ||
b43d65f7 LW |
1815 | /** |
1816 | * pl022_setup - setup function registered to SPI master framework | |
1817 | * @spi: spi device which is requesting setup | |
1818 | * | |
1819 | * This function is registered to the SPI framework for this SPI master | |
1820 | * controller. If it is the first time when setup is called by this device, | |
1821 | * this function will initialize the runtime state for this chip and save | |
1822 | * the same in the device structure. Else it will update the runtime info | |
1823 | * with the updated chip info. Nothing is really being written to the | |
1824 | * controller hardware here, that is not done until the actual transfer | |
1825 | * commence. | |
1826 | */ | |
b43d65f7 LW |
1827 | static int pl022_setup(struct spi_device *spi) |
1828 | { | |
f9d629c7 | 1829 | struct pl022_config_chip const *chip_info; |
6d3952a7 | 1830 | struct pl022_config_chip chip_info_dt; |
b43d65f7 | 1831 | struct chip_data *chip; |
c4a47843 | 1832 | struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0}; |
b43d65f7 LW |
1833 | int status = 0; |
1834 | struct pl022 *pl022 = spi_master_get_devdata(spi->master); | |
bde435a9 KW |
1835 | unsigned int bits = spi->bits_per_word; |
1836 | u32 tmp; | |
6d3952a7 | 1837 | struct device_node *np = spi->dev.of_node; |
b43d65f7 LW |
1838 | |
1839 | if (!spi->max_speed_hz) | |
1840 | return -EINVAL; | |
1841 | ||
1842 | /* Get controller_state if one is supplied */ | |
1843 | chip = spi_get_ctldata(spi); | |
1844 | ||
1845 | if (chip == NULL) { | |
1846 | chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); | |
77538f4a | 1847 | if (!chip) |
b43d65f7 | 1848 | return -ENOMEM; |
b43d65f7 LW |
1849 | dev_dbg(&spi->dev, |
1850 | "allocated memory for controller's runtime state\n"); | |
1851 | } | |
1852 | ||
1853 | /* Get controller data if one is supplied */ | |
1854 | chip_info = spi->controller_data; | |
1855 | ||
1856 | if (chip_info == NULL) { | |
6d3952a7 RS |
1857 | if (np) { |
1858 | chip_info_dt = pl022_default_chip_info; | |
1859 | ||
1860 | chip_info_dt.hierarchy = SSP_MASTER; | |
1861 | of_property_read_u32(np, "pl022,interface", | |
1862 | &chip_info_dt.iface); | |
1863 | of_property_read_u32(np, "pl022,com-mode", | |
1864 | &chip_info_dt.com_mode); | |
1865 | of_property_read_u32(np, "pl022,rx-level-trig", | |
1866 | &chip_info_dt.rx_lev_trig); | |
1867 | of_property_read_u32(np, "pl022,tx-level-trig", | |
1868 | &chip_info_dt.tx_lev_trig); | |
1869 | of_property_read_u32(np, "pl022,ctrl-len", | |
1870 | &chip_info_dt.ctrl_len); | |
1871 | of_property_read_u32(np, "pl022,wait-state", | |
1872 | &chip_info_dt.wait_state); | |
1873 | of_property_read_u32(np, "pl022,duplex", | |
1874 | &chip_info_dt.duplex); | |
1875 | ||
1876 | chip_info = &chip_info_dt; | |
1877 | } else { | |
1878 | chip_info = &pl022_default_chip_info; | |
1879 | /* spi_board_info.controller_data not is supplied */ | |
1880 | dev_dbg(&spi->dev, | |
1881 | "using default controller_data settings\n"); | |
1882 | } | |
f9d629c7 | 1883 | } else |
b43d65f7 LW |
1884 | dev_dbg(&spi->dev, |
1885 | "using user supplied controller_data settings\n"); | |
b43d65f7 LW |
1886 | |
1887 | /* | |
1888 | * We can override with custom divisors, else we use the board | |
1889 | * frequency setting | |
1890 | */ | |
1891 | if ((0 == chip_info->clk_freq.cpsdvsr) | |
1892 | && (0 == chip_info->clk_freq.scr)) { | |
1893 | status = calculate_effective_freq(pl022, | |
1894 | spi->max_speed_hz, | |
f9d629c7 | 1895 | &clk_freq); |
b43d65f7 LW |
1896 | if (status < 0) |
1897 | goto err_config_params; | |
1898 | } else { | |
f9d629c7 LW |
1899 | memcpy(&clk_freq, &chip_info->clk_freq, sizeof(clk_freq)); |
1900 | if ((clk_freq.cpsdvsr % 2) != 0) | |
1901 | clk_freq.cpsdvsr = | |
1902 | clk_freq.cpsdvsr - 1; | |
b43d65f7 | 1903 | } |
f9d629c7 LW |
1904 | if ((clk_freq.cpsdvsr < CPSDVR_MIN) |
1905 | || (clk_freq.cpsdvsr > CPSDVR_MAX)) { | |
e3f88ae9 | 1906 | status = -EINVAL; |
f9d629c7 LW |
1907 | dev_err(&spi->dev, |
1908 | "cpsdvsr is configured incorrectly\n"); | |
1909 | goto err_config_params; | |
1910 | } | |
1911 | ||
b43d65f7 LW |
1912 | status = verify_controller_parameters(pl022, chip_info); |
1913 | if (status) { | |
1914 | dev_err(&spi->dev, "controller data is incorrect"); | |
1915 | goto err_config_params; | |
1916 | } | |
f9d629c7 | 1917 | |
083be3f0 LW |
1918 | pl022->rx_lev_trig = chip_info->rx_lev_trig; |
1919 | pl022->tx_lev_trig = chip_info->tx_lev_trig; | |
1920 | ||
b43d65f7 LW |
1921 | /* Now set controller state based on controller data */ |
1922 | chip->xfer_type = chip_info->com_mode; | |
f9d629c7 LW |
1923 | if (!chip_info->cs_control) { |
1924 | chip->cs_control = null_cs_control; | |
f6f46de1 RS |
1925 | if (!gpio_is_valid(pl022->chipselects[spi->chip_select])) |
1926 | dev_warn(&spi->dev, | |
1927 | "invalid chip select\n"); | |
f9d629c7 LW |
1928 | } else |
1929 | chip->cs_control = chip_info->cs_control; | |
b43d65f7 | 1930 | |
eb798c64 VS |
1931 | /* Check bits per word with vendor specific range */ |
1932 | if ((bits <= 3) || (bits > pl022->vendor->max_bpw)) { | |
bde435a9 | 1933 | status = -ENOTSUPP; |
eb798c64 VS |
1934 | dev_err(&spi->dev, "illegal data size for this controller!\n"); |
1935 | dev_err(&spi->dev, "This controller can only handle 4 <= n <= %d bit words\n", | |
1936 | pl022->vendor->max_bpw); | |
bde435a9 KW |
1937 | goto err_config_params; |
1938 | } else if (bits <= 8) { | |
1939 | dev_dbg(&spi->dev, "4 <= n <=8 bits per word\n"); | |
b43d65f7 LW |
1940 | chip->n_bytes = 1; |
1941 | chip->read = READING_U8; | |
1942 | chip->write = WRITING_U8; | |
bde435a9 | 1943 | } else if (bits <= 16) { |
b43d65f7 LW |
1944 | dev_dbg(&spi->dev, "9 <= n <= 16 bits per word\n"); |
1945 | chip->n_bytes = 2; | |
1946 | chip->read = READING_U16; | |
1947 | chip->write = WRITING_U16; | |
1948 | } else { | |
eb798c64 VS |
1949 | dev_dbg(&spi->dev, "17 <= n <= 32 bits per word\n"); |
1950 | chip->n_bytes = 4; | |
1951 | chip->read = READING_U32; | |
1952 | chip->write = WRITING_U32; | |
b43d65f7 LW |
1953 | } |
1954 | ||
1955 | /* Now Initialize all register settings required for this chip */ | |
1956 | chip->cr0 = 0; | |
1957 | chip->cr1 = 0; | |
1958 | chip->dmacr = 0; | |
1959 | chip->cpsr = 0; | |
1960 | if ((chip_info->com_mode == DMA_TRANSFER) | |
1961 | && ((pl022->master_info)->enable_dma)) { | |
b1b6b9aa | 1962 | chip->enable_dma = true; |
b43d65f7 | 1963 | dev_dbg(&spi->dev, "DMA mode set in controller state\n"); |
b43d65f7 LW |
1964 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, |
1965 | SSP_DMACR_MASK_RXDMAE, 0); | |
1966 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_ENABLED, | |
1967 | SSP_DMACR_MASK_TXDMAE, 1); | |
1968 | } else { | |
b1b6b9aa | 1969 | chip->enable_dma = false; |
b43d65f7 LW |
1970 | dev_dbg(&spi->dev, "DMA mode NOT set in controller state\n"); |
1971 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, | |
1972 | SSP_DMACR_MASK_RXDMAE, 0); | |
1973 | SSP_WRITE_BITS(chip->dmacr, SSP_DMA_DISABLED, | |
1974 | SSP_DMACR_MASK_TXDMAE, 1); | |
1975 | } | |
1976 | ||
f9d629c7 | 1977 | chip->cpsr = clk_freq.cpsdvsr; |
b43d65f7 | 1978 | |
556f4aeb LW |
1979 | /* Special setup for the ST micro extended control registers */ |
1980 | if (pl022->vendor->extended_cr) { | |
bde435a9 KW |
1981 | u32 etx; |
1982 | ||
781c7b12 LW |
1983 | if (pl022->vendor->pl023) { |
1984 | /* These bits are only in the PL023 */ | |
1985 | SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay, | |
1986 | SSP_CR1_MASK_FBCLKDEL_ST, 13); | |
1987 | } else { | |
1988 | /* These bits are in the PL022 but not PL023 */ | |
1989 | SSP_WRITE_BITS(chip->cr0, chip_info->duplex, | |
1990 | SSP_CR0_MASK_HALFDUP_ST, 5); | |
1991 | SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len, | |
1992 | SSP_CR0_MASK_CSS_ST, 16); | |
1993 | SSP_WRITE_BITS(chip->cr0, chip_info->iface, | |
1994 | SSP_CR0_MASK_FRF_ST, 21); | |
1995 | SSP_WRITE_BITS(chip->cr1, chip_info->wait_state, | |
1996 | SSP_CR1_MASK_MWAIT_ST, 6); | |
1997 | } | |
bde435a9 | 1998 | SSP_WRITE_BITS(chip->cr0, bits - 1, |
556f4aeb | 1999 | SSP_CR0_MASK_DSS_ST, 0); |
bde435a9 KW |
2000 | |
2001 | if (spi->mode & SPI_LSB_FIRST) { | |
2002 | tmp = SSP_RX_LSB; | |
2003 | etx = SSP_TX_LSB; | |
2004 | } else { | |
2005 | tmp = SSP_RX_MSB; | |
2006 | etx = SSP_TX_MSB; | |
2007 | } | |
2008 | SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_RENDN_ST, 4); | |
2009 | SSP_WRITE_BITS(chip->cr1, etx, SSP_CR1_MASK_TENDN_ST, 5); | |
556f4aeb LW |
2010 | SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig, |
2011 | SSP_CR1_MASK_RXIFLSEL_ST, 7); | |
2012 | SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig, | |
2013 | SSP_CR1_MASK_TXIFLSEL_ST, 10); | |
2014 | } else { | |
bde435a9 | 2015 | SSP_WRITE_BITS(chip->cr0, bits - 1, |
556f4aeb LW |
2016 | SSP_CR0_MASK_DSS, 0); |
2017 | SSP_WRITE_BITS(chip->cr0, chip_info->iface, | |
2018 | SSP_CR0_MASK_FRF, 4); | |
2019 | } | |
bde435a9 | 2020 | |
556f4aeb | 2021 | /* Stuff that is common for all versions */ |
bde435a9 KW |
2022 | if (spi->mode & SPI_CPOL) |
2023 | tmp = SSP_CLK_POL_IDLE_HIGH; | |
2024 | else | |
2025 | tmp = SSP_CLK_POL_IDLE_LOW; | |
2026 | SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPO, 6); | |
2027 | ||
2028 | if (spi->mode & SPI_CPHA) | |
2029 | tmp = SSP_CLK_SECOND_EDGE; | |
2030 | else | |
2031 | tmp = SSP_CLK_FIRST_EDGE; | |
2032 | SSP_WRITE_BITS(chip->cr0, tmp, SSP_CR0_MASK_SPH, 7); | |
2033 | ||
f9d629c7 | 2034 | SSP_WRITE_BITS(chip->cr0, clk_freq.scr, SSP_CR0_MASK_SCR, 8); |
781c7b12 | 2035 | /* Loopback is available on all versions except PL023 */ |
06fb01fd | 2036 | if (pl022->vendor->loopback) { |
bde435a9 KW |
2037 | if (spi->mode & SPI_LOOP) |
2038 | tmp = LOOPBACK_ENABLED; | |
2039 | else | |
2040 | tmp = LOOPBACK_DISABLED; | |
2041 | SSP_WRITE_BITS(chip->cr1, tmp, SSP_CR1_MASK_LBM, 0); | |
2042 | } | |
b43d65f7 LW |
2043 | SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1); |
2044 | SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2); | |
f1e45f86 VK |
2045 | SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, |
2046 | 3); | |
b43d65f7 LW |
2047 | |
2048 | /* Save controller_state */ | |
2049 | spi_set_ctldata(spi, chip); | |
2050 | return status; | |
2051 | err_config_params: | |
bde435a9 | 2052 | spi_set_ctldata(spi, NULL); |
b43d65f7 LW |
2053 | kfree(chip); |
2054 | return status; | |
2055 | } | |
2056 | ||
2057 | /** | |
2058 | * pl022_cleanup - cleanup function registered to SPI master framework | |
2059 | * @spi: spi device which is requesting cleanup | |
2060 | * | |
2061 | * This function is registered to the SPI framework for this SPI master | |
2062 | * controller. It will free the runtime state of chip. | |
2063 | */ | |
2064 | static void pl022_cleanup(struct spi_device *spi) | |
2065 | { | |
2066 | struct chip_data *chip = spi_get_ctldata(spi); | |
2067 | ||
2068 | spi_set_ctldata(spi, NULL); | |
2069 | kfree(chip); | |
2070 | } | |
2071 | ||
39a6ac11 RS |
2072 | static struct pl022_ssp_controller * |
2073 | pl022_platform_data_dt_get(struct device *dev) | |
2074 | { | |
2075 | struct device_node *np = dev->of_node; | |
2076 | struct pl022_ssp_controller *pd; | |
849794c5 | 2077 | u32 tmp = 0; |
39a6ac11 RS |
2078 | |
2079 | if (!np) { | |
2080 | dev_err(dev, "no dt node defined\n"); | |
2081 | return NULL; | |
2082 | } | |
2083 | ||
2084 | pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL); | |
77538f4a | 2085 | if (!pd) |
39a6ac11 | 2086 | return NULL; |
39a6ac11 RS |
2087 | |
2088 | pd->bus_id = -1; | |
dbd897b9 | 2089 | pd->enable_dma = 1; |
39a6ac11 RS |
2090 | of_property_read_u32(np, "num-cs", &tmp); |
2091 | pd->num_chipselect = tmp; | |
2092 | of_property_read_u32(np, "pl022,autosuspend-delay", | |
2093 | &pd->autosuspend_delay); | |
2094 | pd->rt = of_property_read_bool(np, "pl022,rt"); | |
2095 | ||
2096 | return pd; | |
2097 | } | |
2098 | ||
fd4a319b | 2099 | static int pl022_probe(struct amba_device *adev, const struct amba_id *id) |
b43d65f7 LW |
2100 | { |
2101 | struct device *dev = &adev->dev; | |
8074cf06 JH |
2102 | struct pl022_ssp_controller *platform_info = |
2103 | dev_get_platdata(&adev->dev); | |
b43d65f7 LW |
2104 | struct spi_master *master; |
2105 | struct pl022 *pl022 = NULL; /*Data for this driver */ | |
6d3952a7 RS |
2106 | struct device_node *np = adev->dev.of_node; |
2107 | int status = 0, i, num_cs; | |
b43d65f7 LW |
2108 | |
2109 | dev_info(&adev->dev, | |
2110 | "ARM PL022 driver, device ID: 0x%08x\n", adev->periphid); | |
39a6ac11 RS |
2111 | if (!platform_info && IS_ENABLED(CONFIG_OF)) |
2112 | platform_info = pl022_platform_data_dt_get(dev); | |
2113 | ||
2114 | if (!platform_info) { | |
2115 | dev_err(dev, "probe: no platform data defined\n"); | |
aeef9915 | 2116 | return -ENODEV; |
b43d65f7 LW |
2117 | } |
2118 | ||
6d3952a7 RS |
2119 | if (platform_info->num_chipselect) { |
2120 | num_cs = platform_info->num_chipselect; | |
6d3952a7 | 2121 | } else { |
39a6ac11 | 2122 | dev_err(dev, "probe: no chip select defined\n"); |
aeef9915 | 2123 | return -ENODEV; |
6d3952a7 RS |
2124 | } |
2125 | ||
b43d65f7 | 2126 | /* Allocate master with space for data */ |
b4b84826 | 2127 | master = spi_alloc_master(dev, sizeof(struct pl022)); |
b43d65f7 LW |
2128 | if (master == NULL) { |
2129 | dev_err(&adev->dev, "probe - cannot alloc SPI master\n"); | |
aeef9915 | 2130 | return -ENOMEM; |
b43d65f7 LW |
2131 | } |
2132 | ||
2133 | pl022 = spi_master_get_devdata(master); | |
2134 | pl022->master = master; | |
2135 | pl022->master_info = platform_info; | |
2136 | pl022->adev = adev; | |
2137 | pl022->vendor = id->data; | |
b4b84826 RS |
2138 | pl022->chipselects = devm_kzalloc(dev, num_cs * sizeof(int), |
2139 | GFP_KERNEL); | |
73e3f1eb KP |
2140 | if (!pl022->chipselects) { |
2141 | status = -ENOMEM; | |
2142 | goto err_no_mem; | |
2143 | } | |
b43d65f7 LW |
2144 | |
2145 | /* | |
2146 | * Bus Number Which has been Assigned to this SSP controller | |
2147 | * on this board | |
2148 | */ | |
2149 | master->bus_num = platform_info->bus_id; | |
6d3952a7 | 2150 | master->num_chipselect = num_cs; |
b43d65f7 LW |
2151 | master->cleanup = pl022_cleanup; |
2152 | master->setup = pl022_setup; | |
29b6e906 | 2153 | master->auto_runtime_pm = true; |
ffbbdd21 LW |
2154 | master->transfer_one_message = pl022_transfer_one_message; |
2155 | master->unprepare_transfer_hardware = pl022_unprepare_transfer_hardware; | |
2156 | master->rt = platform_info->rt; | |
6d3952a7 | 2157 | master->dev.of_node = dev->of_node; |
b43d65f7 | 2158 | |
6d3952a7 RS |
2159 | if (platform_info->num_chipselect && platform_info->chipselects) { |
2160 | for (i = 0; i < num_cs; i++) | |
f6f46de1 | 2161 | pl022->chipselects[i] = platform_info->chipselects[i]; |
db4fa45e AB |
2162 | } else if (pl022->vendor->internal_cs_ctrl) { |
2163 | for (i = 0; i < num_cs; i++) | |
2164 | pl022->chipselects[i] = i; | |
6d3952a7 RS |
2165 | } else if (IS_ENABLED(CONFIG_OF)) { |
2166 | for (i = 0; i < num_cs; i++) { | |
2167 | int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); | |
2168 | ||
2169 | if (cs_gpio == -EPROBE_DEFER) { | |
2170 | status = -EPROBE_DEFER; | |
2171 | goto err_no_gpio; | |
2172 | } | |
2173 | ||
2174 | pl022->chipselects[i] = cs_gpio; | |
2175 | ||
2176 | if (gpio_is_valid(cs_gpio)) { | |
aeef9915 | 2177 | if (devm_gpio_request(dev, cs_gpio, "ssp-pl022")) |
6d3952a7 RS |
2178 | dev_err(&adev->dev, |
2179 | "could not request %d gpio\n", | |
2180 | cs_gpio); | |
2181 | else if (gpio_direction_output(cs_gpio, 1)) | |
2182 | dev_err(&adev->dev, | |
61e89e65 | 2183 | "could not set gpio %d as output\n", |
6d3952a7 RS |
2184 | cs_gpio); |
2185 | } | |
2186 | } | |
2187 | } | |
f6f46de1 | 2188 | |
bde435a9 KW |
2189 | /* |
2190 | * Supports mode 0-3, loopback, and active low CS. Transfers are | |
2191 | * always MS bit first on the original pl022. | |
2192 | */ | |
2193 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; | |
2194 | if (pl022->vendor->extended_cr) | |
2195 | master->mode_bits |= SPI_LSB_FIRST; | |
2196 | ||
b43d65f7 LW |
2197 | dev_dbg(&adev->dev, "BUSNO: %d\n", master->bus_num); |
2198 | ||
2199 | status = amba_request_regions(adev, NULL); | |
2200 | if (status) | |
2201 | goto err_no_ioregion; | |
2202 | ||
b1b6b9aa | 2203 | pl022->phybase = adev->res.start; |
aeef9915 LW |
2204 | pl022->virtbase = devm_ioremap(dev, adev->res.start, |
2205 | resource_size(&adev->res)); | |
b43d65f7 LW |
2206 | if (pl022->virtbase == NULL) { |
2207 | status = -ENOMEM; | |
2208 | goto err_no_ioremap; | |
2209 | } | |
2c067509 JH |
2210 | dev_info(&adev->dev, "mapped registers from %pa to %p\n", |
2211 | &adev->res.start, pl022->virtbase); | |
b43d65f7 | 2212 | |
aeef9915 | 2213 | pl022->clk = devm_clk_get(&adev->dev, NULL); |
b43d65f7 LW |
2214 | if (IS_ERR(pl022->clk)) { |
2215 | status = PTR_ERR(pl022->clk); | |
2216 | dev_err(&adev->dev, "could not retrieve SSP/SPI bus clock\n"); | |
2217 | goto err_no_clk; | |
2218 | } | |
7ff6bcf0 | 2219 | |
6cac167b | 2220 | status = clk_prepare_enable(pl022->clk); |
71e63e74 UH |
2221 | if (status) { |
2222 | dev_err(&adev->dev, "could not enable SSP/SPI bus clock\n"); | |
2223 | goto err_no_clk_en; | |
2224 | } | |
2225 | ||
ffbbdd21 LW |
2226 | /* Initialize transfer pump */ |
2227 | tasklet_init(&pl022->pump_transfers, pump_transfers, | |
2228 | (unsigned long)pl022); | |
2229 | ||
b43d65f7 | 2230 | /* Disable SSP */ |
b43d65f7 LW |
2231 | writew((readw(SSP_CR1(pl022->virtbase)) & (~SSP_CR1_MASK_SSE)), |
2232 | SSP_CR1(pl022->virtbase)); | |
2233 | load_ssp_default_config(pl022); | |
b43d65f7 | 2234 | |
aeef9915 LW |
2235 | status = devm_request_irq(dev, adev->irq[0], pl022_interrupt_handler, |
2236 | 0, "pl022", pl022); | |
b43d65f7 LW |
2237 | if (status < 0) { |
2238 | dev_err(&adev->dev, "probe - cannot get IRQ (%d)\n", status); | |
2239 | goto err_no_irq; | |
2240 | } | |
b1b6b9aa | 2241 | |
dc715452 AB |
2242 | /* Get DMA channels, try autoconfiguration first */ |
2243 | status = pl022_dma_autoprobe(pl022); | |
f3d4bb33 RV |
2244 | if (status == -EPROBE_DEFER) { |
2245 | dev_dbg(dev, "deferring probe to get DMA channel\n"); | |
2246 | goto err_no_irq; | |
2247 | } | |
dc715452 AB |
2248 | |
2249 | /* If that failed, use channels from platform_info */ | |
2250 | if (status == 0) | |
2251 | platform_info->enable_dma = 1; | |
2252 | else if (platform_info->enable_dma) { | |
b1b6b9aa LW |
2253 | status = pl022_dma_probe(pl022); |
2254 | if (status != 0) | |
43c64015 | 2255 | platform_info->enable_dma = 0; |
b1b6b9aa LW |
2256 | } |
2257 | ||
b43d65f7 LW |
2258 | /* Register with the SPI framework */ |
2259 | amba_set_drvdata(adev, pl022); | |
35794a77 | 2260 | status = devm_spi_register_master(&adev->dev, master); |
b43d65f7 LW |
2261 | if (status != 0) { |
2262 | dev_err(&adev->dev, | |
2263 | "probe - problem registering spi master\n"); | |
2264 | goto err_spi_register; | |
2265 | } | |
25985edc | 2266 | dev_dbg(dev, "probe succeeded\n"); |
92b97f0a RK |
2267 | |
2268 | /* let runtime pm put suspend */ | |
53e4acea CB |
2269 | if (platform_info->autosuspend_delay > 0) { |
2270 | dev_info(&adev->dev, | |
2271 | "will use autosuspend for runtime pm, delay %dms\n", | |
2272 | platform_info->autosuspend_delay); | |
2273 | pm_runtime_set_autosuspend_delay(dev, | |
2274 | platform_info->autosuspend_delay); | |
2275 | pm_runtime_use_autosuspend(dev); | |
53e4acea | 2276 | } |
0df34994 UH |
2277 | pm_runtime_put(dev); |
2278 | ||
b43d65f7 LW |
2279 | return 0; |
2280 | ||
2281 | err_spi_register: | |
3e3ea716 VK |
2282 | if (platform_info->enable_dma) |
2283 | pl022_dma_remove(pl022); | |
b43d65f7 | 2284 | err_no_irq: |
6cac167b | 2285 | clk_disable_unprepare(pl022->clk); |
71e63e74 | 2286 | err_no_clk_en: |
b43d65f7 | 2287 | err_no_clk: |
b43d65f7 LW |
2288 | err_no_ioremap: |
2289 | amba_release_regions(adev); | |
2290 | err_no_ioregion: | |
6d3952a7 | 2291 | err_no_gpio: |
73e3f1eb | 2292 | err_no_mem: |
b43d65f7 | 2293 | spi_master_put(master); |
b43d65f7 LW |
2294 | return status; |
2295 | } | |
2296 | ||
fd4a319b | 2297 | static int |
b43d65f7 LW |
2298 | pl022_remove(struct amba_device *adev) |
2299 | { | |
2300 | struct pl022 *pl022 = amba_get_drvdata(adev); | |
50658b66 | 2301 | |
b43d65f7 LW |
2302 | if (!pl022) |
2303 | return 0; | |
2304 | ||
92b97f0a RK |
2305 | /* |
2306 | * undo pm_runtime_put() in probe. I assume that we're not | |
2307 | * accessing the primecell here. | |
2308 | */ | |
2309 | pm_runtime_get_noresume(&adev->dev); | |
2310 | ||
b43d65f7 | 2311 | load_ssp_default_config(pl022); |
3e3ea716 VK |
2312 | if (pl022->master_info->enable_dma) |
2313 | pl022_dma_remove(pl022); | |
2314 | ||
6cac167b | 2315 | clk_disable_unprepare(pl022->clk); |
b43d65f7 LW |
2316 | amba_release_regions(adev); |
2317 | tasklet_disable(&pl022->pump_transfers); | |
b43d65f7 LW |
2318 | return 0; |
2319 | } | |
2320 | ||
84a5dc41 | 2321 | #ifdef CONFIG_PM_SLEEP |
6cfa6279 | 2322 | static int pl022_suspend(struct device *dev) |
b43d65f7 | 2323 | { |
92b97f0a | 2324 | struct pl022 *pl022 = dev_get_drvdata(dev); |
ffbbdd21 | 2325 | int ret; |
b43d65f7 | 2326 | |
ffbbdd21 LW |
2327 | ret = spi_master_suspend(pl022->master); |
2328 | if (ret) { | |
2329 | dev_warn(dev, "cannot suspend master\n"); | |
2330 | return ret; | |
b43d65f7 | 2331 | } |
4964a26d | 2332 | |
84a5dc41 UH |
2333 | ret = pm_runtime_force_suspend(dev); |
2334 | if (ret) { | |
2335 | spi_master_resume(pl022->master); | |
2336 | return ret; | |
2337 | } | |
2338 | ||
2339 | pinctrl_pm_select_sleep_state(dev); | |
b43d65f7 | 2340 | |
6cfa6279 | 2341 | dev_dbg(dev, "suspended\n"); |
b43d65f7 LW |
2342 | return 0; |
2343 | } | |
2344 | ||
92b97f0a | 2345 | static int pl022_resume(struct device *dev) |
b43d65f7 | 2346 | { |
92b97f0a | 2347 | struct pl022 *pl022 = dev_get_drvdata(dev); |
ffbbdd21 | 2348 | int ret; |
b43d65f7 | 2349 | |
84a5dc41 UH |
2350 | ret = pm_runtime_force_resume(dev); |
2351 | if (ret) | |
2352 | dev_err(dev, "problem resuming\n"); | |
ada7aec7 | 2353 | |
b43d65f7 | 2354 | /* Start the queue running */ |
ffbbdd21 LW |
2355 | ret = spi_master_resume(pl022->master); |
2356 | if (ret) | |
2357 | dev_err(dev, "problem starting queue (%d)\n", ret); | |
b43d65f7 | 2358 | else |
92b97f0a | 2359 | dev_dbg(dev, "resumed\n"); |
b43d65f7 | 2360 | |
ffbbdd21 | 2361 | return ret; |
b43d65f7 | 2362 | } |
84a5dc41 | 2363 | #endif |
b43d65f7 | 2364 | |
736198b0 | 2365 | #ifdef CONFIG_PM |
92b97f0a RK |
2366 | static int pl022_runtime_suspend(struct device *dev) |
2367 | { | |
2368 | struct pl022 *pl022 = dev_get_drvdata(dev); | |
4f5e1b37 | 2369 | |
84a5dc41 UH |
2370 | clk_disable_unprepare(pl022->clk); |
2371 | pinctrl_pm_select_idle_state(dev); | |
2372 | ||
92b97f0a RK |
2373 | return 0; |
2374 | } | |
2375 | ||
2376 | static int pl022_runtime_resume(struct device *dev) | |
2377 | { | |
2378 | struct pl022 *pl022 = dev_get_drvdata(dev); | |
92b97f0a | 2379 | |
84a5dc41 UH |
2380 | pinctrl_pm_select_default_state(dev); |
2381 | clk_prepare_enable(pl022->clk); | |
2382 | ||
92b97f0a RK |
2383 | return 0; |
2384 | } | |
2385 | #endif | |
2386 | ||
2387 | static const struct dev_pm_ops pl022_dev_pm_ops = { | |
2388 | SET_SYSTEM_SLEEP_PM_OPS(pl022_suspend, pl022_resume) | |
6ed23b80 | 2389 | SET_RUNTIME_PM_OPS(pl022_runtime_suspend, pl022_runtime_resume, NULL) |
92b97f0a RK |
2390 | }; |
2391 | ||
b43d65f7 LW |
2392 | static struct vendor_data vendor_arm = { |
2393 | .fifodepth = 8, | |
2394 | .max_bpw = 16, | |
2395 | .unidir = false, | |
556f4aeb | 2396 | .extended_cr = false, |
781c7b12 | 2397 | .pl023 = false, |
06fb01fd | 2398 | .loopback = true, |
db4fa45e | 2399 | .internal_cs_ctrl = false, |
b43d65f7 LW |
2400 | }; |
2401 | ||
b43d65f7 LW |
2402 | static struct vendor_data vendor_st = { |
2403 | .fifodepth = 32, | |
2404 | .max_bpw = 32, | |
2405 | .unidir = false, | |
556f4aeb | 2406 | .extended_cr = true, |
781c7b12 | 2407 | .pl023 = false, |
06fb01fd | 2408 | .loopback = true, |
db4fa45e | 2409 | .internal_cs_ctrl = false, |
781c7b12 LW |
2410 | }; |
2411 | ||
2412 | static struct vendor_data vendor_st_pl023 = { | |
2413 | .fifodepth = 32, | |
2414 | .max_bpw = 32, | |
2415 | .unidir = false, | |
2416 | .extended_cr = true, | |
2417 | .pl023 = true, | |
06fb01fd | 2418 | .loopback = false, |
db4fa45e AB |
2419 | .internal_cs_ctrl = false, |
2420 | }; | |
2421 | ||
2422 | static struct vendor_data vendor_lsi = { | |
2423 | .fifodepth = 8, | |
2424 | .max_bpw = 16, | |
2425 | .unidir = false, | |
2426 | .extended_cr = false, | |
2427 | .pl023 = false, | |
2428 | .loopback = true, | |
2429 | .internal_cs_ctrl = true, | |
06fb01fd PL |
2430 | }; |
2431 | ||
b43d65f7 LW |
2432 | static struct amba_id pl022_ids[] = { |
2433 | { | |
2434 | /* | |
2435 | * ARM PL022 variant, this has a 16bit wide | |
2436 | * and 8 locations deep TX/RX FIFO | |
2437 | */ | |
2438 | .id = 0x00041022, | |
2439 | .mask = 0x000fffff, | |
2440 | .data = &vendor_arm, | |
2441 | }, | |
2442 | { | |
2443 | /* | |
2444 | * ST Micro derivative, this has 32bit wide | |
2445 | * and 32 locations deep TX/RX FIFO | |
2446 | */ | |
e89e04fc | 2447 | .id = 0x01080022, |
b43d65f7 LW |
2448 | .mask = 0xffffffff, |
2449 | .data = &vendor_st, | |
2450 | }, | |
781c7b12 LW |
2451 | { |
2452 | /* | |
2453 | * ST-Ericsson derivative "PL023" (this is not | |
2454 | * an official ARM number), this is a PL022 SSP block | |
2455 | * stripped to SPI mode only, it has 32bit wide | |
2456 | * and 32 locations deep TX/RX FIFO but no extended | |
2457 | * CR0/CR1 register | |
2458 | */ | |
f1e45f86 VK |
2459 | .id = 0x00080023, |
2460 | .mask = 0xffffffff, | |
2461 | .data = &vendor_st_pl023, | |
781c7b12 | 2462 | }, |
db4fa45e AB |
2463 | { |
2464 | /* | |
2465 | * PL022 variant that has a chip select control register whih | |
2466 | * allows control of 5 output signals nCS[0:4]. | |
2467 | */ | |
2468 | .id = 0x000b6022, | |
2469 | .mask = 0x000fffff, | |
2470 | .data = &vendor_lsi, | |
2471 | }, | |
b43d65f7 LW |
2472 | { 0, 0 }, |
2473 | }; | |
2474 | ||
7eeac71b DM |
2475 | MODULE_DEVICE_TABLE(amba, pl022_ids); |
2476 | ||
b43d65f7 LW |
2477 | static struct amba_driver pl022_driver = { |
2478 | .drv = { | |
2479 | .name = "ssp-pl022", | |
92b97f0a | 2480 | .pm = &pl022_dev_pm_ops, |
b43d65f7 LW |
2481 | }, |
2482 | .id_table = pl022_ids, | |
2483 | .probe = pl022_probe, | |
fd4a319b | 2484 | .remove = pl022_remove, |
b43d65f7 LW |
2485 | }; |
2486 | ||
b43d65f7 LW |
2487 | static int __init pl022_init(void) |
2488 | { | |
2489 | return amba_driver_register(&pl022_driver); | |
2490 | } | |
25c8e03b | 2491 | subsys_initcall(pl022_init); |
b43d65f7 LW |
2492 | |
2493 | static void __exit pl022_exit(void) | |
2494 | { | |
2495 | amba_driver_unregister(&pl022_driver); | |
2496 | } | |
b43d65f7 LW |
2497 | module_exit(pl022_exit); |
2498 | ||
2499 | MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); | |
2500 | MODULE_DESCRIPTION("PL022 SSP Controller Driver"); | |
2501 | MODULE_LICENSE("GPL"); |