Commit | Line | Data |
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e8b17b5b MO |
1 | /* |
2 | * SPI bus driver for the Topcliff PCH used by Intel SoCs | |
65308c46 | 3 | * |
2b246283 | 4 | * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. |
e8b17b5b MO |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
65308c46 | 20 | #include <linux/delay.h> |
e8b17b5b MO |
21 | #include <linux/pci.h> |
22 | #include <linux/wait.h> | |
23 | #include <linux/spi/spi.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/spi/spidev.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/device.h> | |
f016aeb6 | 29 | #include <linux/platform_device.h> |
e8b17b5b | 30 | |
c37f3c27 TM |
31 | #include <linux/dmaengine.h> |
32 | #include <linux/pch_dma.h> | |
33 | ||
e8b17b5b MO |
34 | /* Register offsets */ |
35 | #define PCH_SPCR 0x00 /* SPI control register */ | |
36 | #define PCH_SPBRR 0x04 /* SPI baud rate register */ | |
37 | #define PCH_SPSR 0x08 /* SPI status register */ | |
38 | #define PCH_SPDWR 0x0C /* SPI write data register */ | |
39 | #define PCH_SPDRR 0x10 /* SPI read data register */ | |
40 | #define PCH_SSNXCR 0x18 /* SSN Expand Control Register */ | |
41 | #define PCH_SRST 0x1C /* SPI reset register */ | |
c37f3c27 | 42 | #define PCH_ADDRESS_SIZE 0x20 |
e8b17b5b MO |
43 | |
44 | #define PCH_SPSR_TFD 0x000007C0 | |
45 | #define PCH_SPSR_RFD 0x0000F800 | |
46 | ||
47 | #define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11) | |
48 | #define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6) | |
49 | ||
50 | #define PCH_RX_THOLD 7 | |
51 | #define PCH_RX_THOLD_MAX 15 | |
e8b17b5b | 52 | |
f3e03e2e TM |
53 | #define PCH_TX_THOLD 2 |
54 | ||
e8b17b5b MO |
55 | #define PCH_MAX_BAUDRATE 5000000 |
56 | #define PCH_MAX_FIFO_DEPTH 16 | |
57 | ||
58 | #define STATUS_RUNNING 1 | |
59 | #define STATUS_EXITING 2 | |
60 | #define PCH_SLEEP_TIME 10 | |
61 | ||
e8b17b5b | 62 | #define SSN_LOW 0x02U |
8b7aa961 | 63 | #define SSN_HIGH 0x03U |
e8b17b5b MO |
64 | #define SSN_NO_CONTROL 0x00U |
65 | #define PCH_MAX_CS 0xFF | |
66 | #define PCI_DEVICE_ID_GE_SPI 0x8816 | |
67 | ||
68 | #define SPCR_SPE_BIT (1 << 0) | |
69 | #define SPCR_MSTR_BIT (1 << 1) | |
70 | #define SPCR_LSBF_BIT (1 << 4) | |
71 | #define SPCR_CPHA_BIT (1 << 5) | |
72 | #define SPCR_CPOL_BIT (1 << 6) | |
73 | #define SPCR_TFIE_BIT (1 << 8) | |
74 | #define SPCR_RFIE_BIT (1 << 9) | |
75 | #define SPCR_FIE_BIT (1 << 10) | |
76 | #define SPCR_ORIE_BIT (1 << 11) | |
77 | #define SPCR_MDFIE_BIT (1 << 12) | |
78 | #define SPCR_FICLR_BIT (1 << 24) | |
79 | #define SPSR_TFI_BIT (1 << 0) | |
80 | #define SPSR_RFI_BIT (1 << 1) | |
81 | #define SPSR_FI_BIT (1 << 2) | |
c37f3c27 | 82 | #define SPSR_ORF_BIT (1 << 3) |
e8b17b5b MO |
83 | #define SPBRR_SIZE_BIT (1 << 10) |
84 | ||
f016aeb6 TM |
85 | #define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\ |
86 | SPCR_ORIE_BIT|SPCR_MDFIE_BIT) | |
65308c46 | 87 | |
e8b17b5b MO |
88 | #define SPCR_RFIC_FIELD 20 |
89 | #define SPCR_TFIC_FIELD 16 | |
90 | ||
c37f3c27 TM |
91 | #define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1) |
92 | #define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD) | |
93 | #define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD) | |
e8b17b5b MO |
94 | |
95 | #define PCH_CLOCK_HZ 50000000 | |
96 | #define PCH_MAX_SPBR 1023 | |
97 | ||
2b246283 | 98 | /* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */ |
f016aeb6 TM |
99 | #define PCI_VENDOR_ID_ROHM 0x10DB |
100 | #define PCI_DEVICE_ID_ML7213_SPI 0x802c | |
2e2de2e3 | 101 | #define PCI_DEVICE_ID_ML7223_SPI 0x800F |
92b3a5c1 | 102 | #define PCI_DEVICE_ID_ML7831_SPI 0x8816 |
f016aeb6 TM |
103 | |
104 | /* | |
105 | * Set the number of SPI instance max | |
106 | * Intel EG20T PCH : 1ch | |
2b246283 TM |
107 | * LAPIS Semiconductor ML7213 IOH : 2ch |
108 | * LAPIS Semiconductor ML7223 IOH : 1ch | |
109 | * LAPIS Semiconductor ML7831 IOH : 1ch | |
f016aeb6 TM |
110 | */ |
111 | #define PCH_SPI_MAX_DEV 2 | |
e8b17b5b | 112 | |
c37f3c27 TM |
113 | #define PCH_BUF_SIZE 4096 |
114 | #define PCH_DMA_TRANS_SIZE 12 | |
115 | ||
116 | static int use_dma = 1; | |
117 | ||
118 | struct pch_spi_dma_ctrl { | |
119 | struct dma_async_tx_descriptor *desc_tx; | |
120 | struct dma_async_tx_descriptor *desc_rx; | |
121 | struct pch_dma_slave param_tx; | |
122 | struct pch_dma_slave param_rx; | |
123 | struct dma_chan *chan_tx; | |
124 | struct dma_chan *chan_rx; | |
125 | struct scatterlist *sg_tx_p; | |
126 | struct scatterlist *sg_rx_p; | |
127 | struct scatterlist sg_tx; | |
128 | struct scatterlist sg_rx; | |
129 | int nent; | |
130 | void *tx_buf_virt; | |
131 | void *rx_buf_virt; | |
132 | dma_addr_t tx_buf_dma; | |
133 | dma_addr_t rx_buf_dma; | |
134 | }; | |
e8b17b5b MO |
135 | /** |
136 | * struct pch_spi_data - Holds the SPI channel specific details | |
137 | * @io_remap_addr: The remapped PCI base address | |
138 | * @master: Pointer to the SPI master structure | |
139 | * @work: Reference to work queue handler | |
140 | * @wk: Workqueue for carrying out execution of the | |
141 | * requests | |
142 | * @wait: Wait queue for waking up upon receiving an | |
143 | * interrupt. | |
144 | * @transfer_complete: Status of SPI Transfer | |
145 | * @bcurrent_msg_processing: Status flag for message processing | |
146 | * @lock: Lock for protecting this structure | |
147 | * @queue: SPI Message queue | |
148 | * @status: Status of the SPI driver | |
149 | * @bpw_len: Length of data to be transferred in bits per | |
150 | * word | |
151 | * @transfer_active: Flag showing active transfer | |
152 | * @tx_index: Transmit data count; for bookkeeping during | |
153 | * transfer | |
154 | * @rx_index: Receive data count; for bookkeeping during | |
155 | * transfer | |
156 | * @tx_buff: Buffer for data to be transmitted | |
157 | * @rx_index: Buffer for Received data | |
158 | * @n_curnt_chip: The chip number that this SPI driver currently | |
159 | * operates on | |
160 | * @current_chip: Reference to the current chip that this SPI | |
161 | * driver currently operates on | |
162 | * @current_msg: The current message that this SPI driver is | |
163 | * handling | |
164 | * @cur_trans: The current transfer that this SPI driver is | |
165 | * handling | |
166 | * @board_dat: Reference to the SPI device data structure | |
f016aeb6 TM |
167 | * @plat_dev: platform_device structure |
168 | * @ch: SPI channel number | |
169 | * @irq_reg_sts: Status of IRQ registration | |
e8b17b5b MO |
170 | */ |
171 | struct pch_spi_data { | |
172 | void __iomem *io_remap_addr; | |
c37f3c27 | 173 | unsigned long io_base_addr; |
e8b17b5b MO |
174 | struct spi_master *master; |
175 | struct work_struct work; | |
176 | struct workqueue_struct *wk; | |
177 | wait_queue_head_t wait; | |
178 | u8 transfer_complete; | |
179 | u8 bcurrent_msg_processing; | |
180 | spinlock_t lock; | |
181 | struct list_head queue; | |
182 | u8 status; | |
183 | u32 bpw_len; | |
184 | u8 transfer_active; | |
185 | u32 tx_index; | |
186 | u32 rx_index; | |
187 | u16 *pkt_tx_buff; | |
188 | u16 *pkt_rx_buff; | |
189 | u8 n_curnt_chip; | |
190 | struct spi_device *current_chip; | |
191 | struct spi_message *current_msg; | |
192 | struct spi_transfer *cur_trans; | |
193 | struct pch_spi_board_data *board_dat; | |
f016aeb6 TM |
194 | struct platform_device *plat_dev; |
195 | int ch; | |
c37f3c27 TM |
196 | struct pch_spi_dma_ctrl dma; |
197 | int use_dma; | |
f016aeb6 | 198 | u8 irq_reg_sts; |
7d05b3e8 | 199 | int save_total_len; |
e8b17b5b MO |
200 | }; |
201 | ||
202 | /** | |
203 | * struct pch_spi_board_data - Holds the SPI device specific details | |
204 | * @pdev: Pointer to the PCI device | |
e8b17b5b | 205 | * @suspend_sts: Status of suspend |
f016aeb6 | 206 | * @num: The number of SPI device instance |
e8b17b5b MO |
207 | */ |
208 | struct pch_spi_board_data { | |
209 | struct pci_dev *pdev; | |
e8b17b5b | 210 | u8 suspend_sts; |
f016aeb6 TM |
211 | int num; |
212 | }; | |
213 | ||
214 | struct pch_pd_dev_save { | |
215 | int num; | |
216 | struct platform_device *pd_save[PCH_SPI_MAX_DEV]; | |
217 | struct pch_spi_board_data *board_dat; | |
e8b17b5b MO |
218 | }; |
219 | ||
9a21e477 | 220 | static const struct pci_device_id pch_spi_pcidev_id[] = { |
f016aeb6 TM |
221 | { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, }, |
222 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, }, | |
2e2de2e3 | 223 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, }, |
92b3a5c1 | 224 | { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, }, |
f016aeb6 | 225 | { } |
e8b17b5b MO |
226 | }; |
227 | ||
e8b17b5b MO |
228 | /** |
229 | * pch_spi_writereg() - Performs register writes | |
230 | * @master: Pointer to struct spi_master. | |
231 | * @idx: Register offset. | |
232 | * @val: Value to be written to register. | |
233 | */ | |
234 | static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val) | |
235 | { | |
e8b17b5b | 236 | struct pch_spi_data *data = spi_master_get_devdata(master); |
e8b17b5b MO |
237 | iowrite32(val, (data->io_remap_addr + idx)); |
238 | } | |
239 | ||
240 | /** | |
241 | * pch_spi_readreg() - Performs register reads | |
242 | * @master: Pointer to struct spi_master. | |
243 | * @idx: Register offset. | |
244 | */ | |
245 | static inline u32 pch_spi_readreg(struct spi_master *master, int idx) | |
246 | { | |
247 | struct pch_spi_data *data = spi_master_get_devdata(master); | |
e8b17b5b MO |
248 | return ioread32(data->io_remap_addr + idx); |
249 | } | |
250 | ||
e8b17b5b MO |
251 | static inline void pch_spi_setclr_reg(struct spi_master *master, int idx, |
252 | u32 set, u32 clr) | |
253 | { | |
254 | u32 tmp = pch_spi_readreg(master, idx); | |
255 | tmp = (tmp & ~clr) | set; | |
256 | pch_spi_writereg(master, idx, tmp); | |
257 | } | |
258 | ||
e8b17b5b MO |
259 | static void pch_spi_set_master_mode(struct spi_master *master) |
260 | { | |
261 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0); | |
262 | } | |
263 | ||
264 | /** | |
265 | * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs | |
266 | * @master: Pointer to struct spi_master. | |
267 | */ | |
268 | static void pch_spi_clear_fifo(struct spi_master *master) | |
269 | { | |
270 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0); | |
271 | pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT); | |
272 | } | |
273 | ||
e8b17b5b MO |
274 | static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, |
275 | void __iomem *io_remap_addr) | |
276 | { | |
277 | u32 n_read, tx_index, rx_index, bpw_len; | |
278 | u16 *pkt_rx_buffer, *pkt_tx_buff; | |
279 | int read_cnt; | |
280 | u32 reg_spcr_val; | |
281 | void __iomem *spsr; | |
282 | void __iomem *spdrr; | |
283 | void __iomem *spdwr; | |
284 | ||
285 | spsr = io_remap_addr + PCH_SPSR; | |
286 | iowrite32(reg_spsr_val, spsr); | |
287 | ||
288 | if (data->transfer_active) { | |
289 | rx_index = data->rx_index; | |
290 | tx_index = data->tx_index; | |
291 | bpw_len = data->bpw_len; | |
292 | pkt_rx_buffer = data->pkt_rx_buff; | |
293 | pkt_tx_buff = data->pkt_tx_buff; | |
294 | ||
295 | spdrr = io_remap_addr + PCH_SPDRR; | |
296 | spdwr = io_remap_addr + PCH_SPDWR; | |
297 | ||
298 | n_read = PCH_READABLE(reg_spsr_val); | |
299 | ||
300 | for (read_cnt = 0; (read_cnt < n_read); read_cnt++) { | |
301 | pkt_rx_buffer[rx_index++] = ioread32(spdrr); | |
302 | if (tx_index < bpw_len) | |
303 | iowrite32(pkt_tx_buff[tx_index++], spdwr); | |
304 | } | |
305 | ||
306 | /* disable RFI if not needed */ | |
307 | if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) { | |
308 | reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR); | |
65308c46 | 309 | reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ |
e8b17b5b MO |
310 | |
311 | /* reset rx threshold */ | |
c37f3c27 | 312 | reg_spcr_val &= ~MASK_RFIC_SPCR_BITS; |
e8b17b5b | 313 | reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD); |
c37f3c27 TM |
314 | |
315 | iowrite32(reg_spcr_val, (io_remap_addr + PCH_SPCR)); | |
e8b17b5b MO |
316 | } |
317 | ||
318 | /* update counts */ | |
319 | data->tx_index = tx_index; | |
320 | data->rx_index = rx_index; | |
321 | ||
de3bd7e6 DK |
322 | /* if transfer complete interrupt */ |
323 | if (reg_spsr_val & SPSR_FI_BIT) { | |
324 | if ((tx_index == bpw_len) && (rx_index == tx_index)) { | |
325 | /* disable interrupts */ | |
326 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, | |
327 | PCH_ALL); | |
328 | ||
329 | /* transfer is completed; | |
330 | inform pch_spi_process_messages */ | |
331 | data->transfer_complete = true; | |
332 | data->transfer_active = false; | |
333 | wake_up(&data->wait); | |
334 | } else { | |
335 | dev_err(&data->master->dev, | |
336 | "%s : Transfer is not completed", | |
337 | __func__); | |
338 | } | |
373b0eb6 | 339 | } |
e8b17b5b MO |
340 | } |
341 | } | |
342 | ||
e8b17b5b MO |
343 | /** |
344 | * pch_spi_handler() - Interrupt handler | |
345 | * @irq: The interrupt number. | |
346 | * @dev_id: Pointer to struct pch_spi_board_data. | |
347 | */ | |
348 | static irqreturn_t pch_spi_handler(int irq, void *dev_id) | |
349 | { | |
350 | u32 reg_spsr_val; | |
e8b17b5b MO |
351 | void __iomem *spsr; |
352 | void __iomem *io_remap_addr; | |
353 | irqreturn_t ret = IRQ_NONE; | |
f016aeb6 TM |
354 | struct pch_spi_data *data = dev_id; |
355 | struct pch_spi_board_data *board_dat = data->board_dat; | |
e8b17b5b MO |
356 | |
357 | if (board_dat->suspend_sts) { | |
358 | dev_dbg(&board_dat->pdev->dev, | |
359 | "%s returning due to suspend\n", __func__); | |
360 | return IRQ_NONE; | |
361 | } | |
362 | ||
e8b17b5b MO |
363 | io_remap_addr = data->io_remap_addr; |
364 | spsr = io_remap_addr + PCH_SPSR; | |
365 | ||
366 | reg_spsr_val = ioread32(spsr); | |
367 | ||
25e803f9 TM |
368 | if (reg_spsr_val & SPSR_ORF_BIT) { |
369 | dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__); | |
f5d8ee3f | 370 | if (data->current_msg->complete) { |
25e803f9 TM |
371 | data->transfer_complete = true; |
372 | data->current_msg->status = -EIO; | |
373 | data->current_msg->complete(data->current_msg->context); | |
374 | data->bcurrent_msg_processing = false; | |
375 | data->current_msg = NULL; | |
376 | data->cur_trans = NULL; | |
377 | } | |
378 | } | |
379 | ||
380 | if (data->use_dma) | |
381 | return IRQ_NONE; | |
c37f3c27 | 382 | |
e8b17b5b | 383 | /* Check if the interrupt is for SPI device */ |
e8b17b5b MO |
384 | if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) { |
385 | pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr); | |
386 | ret = IRQ_HANDLED; | |
387 | } | |
388 | ||
389 | dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n", | |
390 | __func__, ret); | |
391 | ||
392 | return ret; | |
393 | } | |
394 | ||
395 | /** | |
396 | * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR | |
397 | * @master: Pointer to struct spi_master. | |
398 | * @speed_hz: Baud rate. | |
399 | */ | |
400 | static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz) | |
401 | { | |
65308c46 | 402 | u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2); |
e8b17b5b MO |
403 | |
404 | /* if baud rate is less than we can support limit it */ | |
e8b17b5b MO |
405 | if (n_spbr > PCH_MAX_SPBR) |
406 | n_spbr = PCH_MAX_SPBR; | |
407 | ||
c37f3c27 | 408 | pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, MASK_SPBRR_SPBR_BITS); |
e8b17b5b MO |
409 | } |
410 | ||
411 | /** | |
412 | * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR | |
413 | * @master: Pointer to struct spi_master. | |
414 | * @bits_per_word: Bits per word for SPI transfer. | |
415 | */ | |
416 | static void pch_spi_set_bits_per_word(struct spi_master *master, | |
417 | u8 bits_per_word) | |
418 | { | |
419 | if (bits_per_word == 8) | |
420 | pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT); | |
421 | else | |
422 | pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0); | |
423 | } | |
424 | ||
425 | /** | |
426 | * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer | |
427 | * @spi: Pointer to struct spi_device. | |
428 | */ | |
429 | static void pch_spi_setup_transfer(struct spi_device *spi) | |
430 | { | |
65308c46 | 431 | u32 flags = 0; |
e8b17b5b MO |
432 | |
433 | dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n", | |
434 | __func__, pch_spi_readreg(spi->master, PCH_SPBRR), | |
435 | spi->max_speed_hz); | |
e8b17b5b MO |
436 | pch_spi_set_baud_rate(spi->master, spi->max_speed_hz); |
437 | ||
438 | /* set bits per word */ | |
439 | pch_spi_set_bits_per_word(spi->master, spi->bits_per_word); | |
440 | ||
65308c46 GL |
441 | if (!(spi->mode & SPI_LSB_FIRST)) |
442 | flags |= SPCR_LSBF_BIT; | |
e8b17b5b | 443 | if (spi->mode & SPI_CPOL) |
65308c46 | 444 | flags |= SPCR_CPOL_BIT; |
e8b17b5b | 445 | if (spi->mode & SPI_CPHA) |
65308c46 GL |
446 | flags |= SPCR_CPHA_BIT; |
447 | pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, | |
448 | (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT)); | |
e8b17b5b MO |
449 | |
450 | /* Clear the FIFO by toggling FICLR to 1 and back to 0 */ | |
451 | pch_spi_clear_fifo(spi->master); | |
452 | } | |
453 | ||
e8b17b5b MO |
454 | /** |
455 | * pch_spi_reset() - Clears SPI registers | |
456 | * @master: Pointer to struct spi_master. | |
457 | */ | |
458 | static void pch_spi_reset(struct spi_master *master) | |
459 | { | |
460 | /* write 1 to reset SPI */ | |
461 | pch_spi_writereg(master, PCH_SRST, 0x1); | |
462 | ||
463 | /* clear reset */ | |
464 | pch_spi_writereg(master, PCH_SRST, 0x0); | |
465 | } | |
466 | ||
467 | static int pch_spi_setup(struct spi_device *pspi) | |
468 | { | |
469 | /* check bits per word */ | |
65308c46 | 470 | if (pspi->bits_per_word == 0) { |
e8b17b5b MO |
471 | pspi->bits_per_word = 8; |
472 | dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__); | |
473 | } | |
474 | ||
e8b17b5b MO |
475 | /* Check baud rate setting */ |
476 | /* if baud rate of chip is greater than | |
477 | max we can support,return error */ | |
478 | if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE) | |
479 | pspi->max_speed_hz = PCH_MAX_BAUDRATE; | |
480 | ||
481 | dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__, | |
65308c46 | 482 | (pspi->mode) & (SPI_CPOL | SPI_CPHA)); |
e8b17b5b MO |
483 | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) | |
488 | { | |
489 | ||
490 | struct spi_transfer *transfer; | |
491 | struct pch_spi_data *data = spi_master_get_devdata(pspi->master); | |
492 | int retval; | |
493 | unsigned long flags; | |
494 | ||
495 | /* validate spi message and baud rate */ | |
65308c46 GL |
496 | if (unlikely(list_empty(&pmsg->transfers) == 1)) { |
497 | dev_err(&pspi->dev, "%s list empty\n", __func__); | |
498 | retval = -EINVAL; | |
499 | goto err_out; | |
500 | } | |
e8b17b5b | 501 | |
65308c46 | 502 | if (unlikely(pspi->max_speed_hz == 0)) { |
886db6ac | 503 | dev_err(&pspi->dev, "%s pch_spi_transfer maxspeed=%d\n", |
65308c46 | 504 | __func__, pspi->max_speed_hz); |
e8b17b5b MO |
505 | retval = -EINVAL; |
506 | goto err_out; | |
507 | } | |
508 | ||
f6bd03a7 JN |
509 | dev_dbg(&pspi->dev, |
510 | "%s Transfer List not empty. Transfer Speed is set.\n", __func__); | |
e8b17b5b | 511 | |
c37f3c27 | 512 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b MO |
513 | /* validate Tx/Rx buffers and Transfer length */ |
514 | list_for_each_entry(transfer, &pmsg->transfers, transfer_list) { | |
65308c46 | 515 | if (!transfer->tx_buf && !transfer->rx_buf) { |
e8b17b5b MO |
516 | dev_err(&pspi->dev, |
517 | "%s Tx and Rx buffer NULL\n", __func__); | |
518 | retval = -EINVAL; | |
c37f3c27 | 519 | goto err_return_spinlock; |
e8b17b5b MO |
520 | } |
521 | ||
65308c46 | 522 | if (!transfer->len) { |
e8b17b5b MO |
523 | dev_err(&pspi->dev, "%s Transfer length invalid\n", |
524 | __func__); | |
525 | retval = -EINVAL; | |
c37f3c27 | 526 | goto err_return_spinlock; |
e8b17b5b MO |
527 | } |
528 | ||
f6bd03a7 JN |
529 | dev_dbg(&pspi->dev, |
530 | "%s Tx/Rx buffer valid. Transfer length valid\n", | |
531 | __func__); | |
e8b17b5b | 532 | |
c37f3c27 | 533 | /* if baud rate has been specified validate the same */ |
65308c46 GL |
534 | if (transfer->speed_hz > PCH_MAX_BAUDRATE) |
535 | transfer->speed_hz = PCH_MAX_BAUDRATE; | |
e8b17b5b | 536 | } |
c37f3c27 | 537 | spin_unlock_irqrestore(&data->lock, flags); |
e8b17b5b | 538 | |
65308c46 GL |
539 | /* We won't process any messages if we have been asked to terminate */ |
540 | if (data->status == STATUS_EXITING) { | |
e8b17b5b MO |
541 | dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); |
542 | retval = -ESHUTDOWN; | |
c37f3c27 | 543 | goto err_out; |
e8b17b5b MO |
544 | } |
545 | ||
546 | /* If suspended ,return -EINVAL */ | |
547 | if (data->board_dat->suspend_sts) { | |
65308c46 | 548 | dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); |
e8b17b5b | 549 | retval = -EINVAL; |
c37f3c27 | 550 | goto err_out; |
e8b17b5b MO |
551 | } |
552 | ||
553 | /* set status of message */ | |
554 | pmsg->actual_length = 0; | |
e8b17b5b MO |
555 | dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); |
556 | ||
557 | pmsg->status = -EINPROGRESS; | |
c37f3c27 | 558 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b MO |
559 | /* add message to queue */ |
560 | list_add_tail(&pmsg->queue, &data->queue); | |
c37f3c27 TM |
561 | spin_unlock_irqrestore(&data->lock, flags); |
562 | ||
e8b17b5b MO |
563 | dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__); |
564 | ||
565 | /* schedule work queue to run */ | |
566 | queue_work(data->wk, &data->work); | |
e8b17b5b MO |
567 | dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__); |
568 | ||
569 | retval = 0; | |
570 | ||
e8b17b5b MO |
571 | err_out: |
572 | dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); | |
573 | return retval; | |
c37f3c27 TM |
574 | err_return_spinlock: |
575 | dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); | |
576 | spin_unlock_irqrestore(&data->lock, flags); | |
577 | return retval; | |
e8b17b5b MO |
578 | } |
579 | ||
580 | static inline void pch_spi_select_chip(struct pch_spi_data *data, | |
581 | struct spi_device *pspi) | |
582 | { | |
65308c46 GL |
583 | if (data->current_chip != NULL) { |
584 | if (pspi->chip_select != data->n_curnt_chip) { | |
585 | dev_dbg(&pspi->dev, "%s : different slave\n", __func__); | |
e8b17b5b MO |
586 | data->current_chip = NULL; |
587 | } | |
588 | } | |
589 | ||
590 | data->current_chip = pspi; | |
591 | ||
592 | data->n_curnt_chip = data->current_chip->chip_select; | |
593 | ||
594 | dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__); | |
595 | pch_spi_setup_transfer(pspi); | |
596 | } | |
597 | ||
c37f3c27 | 598 | static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw) |
e8b17b5b | 599 | { |
e8b17b5b MO |
600 | int size; |
601 | u32 n_writes; | |
602 | int j; | |
cd8d984f | 603 | struct spi_message *pmsg, *tmp; |
e8b17b5b MO |
604 | const u8 *tx_buf; |
605 | const u16 *tx_sbuf; | |
606 | ||
e8b17b5b MO |
607 | /* set baud rate if needed */ |
608 | if (data->cur_trans->speed_hz) { | |
65308c46 GL |
609 | dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); |
610 | pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); | |
e8b17b5b MO |
611 | } |
612 | ||
613 | /* set bits per word if needed */ | |
65308c46 GL |
614 | if (data->cur_trans->bits_per_word && |
615 | (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) { | |
616 | dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); | |
e8b17b5b | 617 | pch_spi_set_bits_per_word(data->master, |
65308c46 | 618 | data->cur_trans->bits_per_word); |
e8b17b5b MO |
619 | *bpw = data->cur_trans->bits_per_word; |
620 | } else { | |
621 | *bpw = data->current_msg->spi->bits_per_word; | |
622 | } | |
623 | ||
624 | /* reset Tx/Rx index */ | |
625 | data->tx_index = 0; | |
626 | data->rx_index = 0; | |
627 | ||
628 | data->bpw_len = data->cur_trans->len / (*bpw / 8); | |
e8b17b5b MO |
629 | |
630 | /* find alloc size */ | |
65308c46 GL |
631 | size = data->cur_trans->len * sizeof(*data->pkt_tx_buff); |
632 | ||
e8b17b5b MO |
633 | /* allocate memory for pkt_tx_buff & pkt_rx_buffer */ |
634 | data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); | |
e8b17b5b MO |
635 | if (data->pkt_tx_buff != NULL) { |
636 | data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); | |
65308c46 | 637 | if (!data->pkt_rx_buff) |
e8b17b5b | 638 | kfree(data->pkt_tx_buff); |
e8b17b5b MO |
639 | } |
640 | ||
65308c46 | 641 | if (!data->pkt_rx_buff) { |
e8b17b5b | 642 | /* flush queue and set status of all transfers to -ENOMEM */ |
65308c46 | 643 | dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__); |
cd8d984f | 644 | list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { |
e8b17b5b MO |
645 | pmsg->status = -ENOMEM; |
646 | ||
f5d8ee3f | 647 | if (pmsg->complete) |
e8b17b5b MO |
648 | pmsg->complete(pmsg->context); |
649 | ||
650 | /* delete from queue */ | |
651 | list_del_init(&pmsg->queue); | |
652 | } | |
e8b17b5b MO |
653 | return; |
654 | } | |
655 | ||
656 | /* copy Tx Data */ | |
65308c46 | 657 | if (data->cur_trans->tx_buf != NULL) { |
e8b17b5b | 658 | if (*bpw == 8) { |
65308c46 GL |
659 | tx_buf = data->cur_trans->tx_buf; |
660 | for (j = 0; j < data->bpw_len; j++) | |
661 | data->pkt_tx_buff[j] = *tx_buf++; | |
e8b17b5b | 662 | } else { |
65308c46 GL |
663 | tx_sbuf = data->cur_trans->tx_buf; |
664 | for (j = 0; j < data->bpw_len; j++) | |
665 | data->pkt_tx_buff[j] = *tx_sbuf++; | |
e8b17b5b MO |
666 | } |
667 | } | |
668 | ||
669 | /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */ | |
65308c46 GL |
670 | n_writes = data->bpw_len; |
671 | if (n_writes > PCH_MAX_FIFO_DEPTH) | |
e8b17b5b | 672 | n_writes = PCH_MAX_FIFO_DEPTH; |
e8b17b5b | 673 | |
65308c46 | 674 | dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " |
e8b17b5b MO |
675 | "0x2 to SSNXCR\n", __func__); |
676 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); | |
677 | ||
65308c46 GL |
678 | for (j = 0; j < n_writes; j++) |
679 | pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]); | |
e8b17b5b MO |
680 | |
681 | /* update tx_index */ | |
682 | data->tx_index = j; | |
683 | ||
684 | /* reset transfer complete flag */ | |
685 | data->transfer_complete = false; | |
686 | data->transfer_active = true; | |
687 | } | |
688 | ||
c37f3c27 | 689 | static void pch_spi_nomore_transfer(struct pch_spi_data *data) |
e8b17b5b | 690 | { |
cd8d984f | 691 | struct spi_message *pmsg, *tmp; |
65308c46 | 692 | dev_dbg(&data->master->dev, "%s called\n", __func__); |
e8b17b5b | 693 | /* Invoke complete callback |
65308c46 | 694 | * [To the spi core..indicating end of transfer] */ |
e8b17b5b MO |
695 | data->current_msg->status = 0; |
696 | ||
f5d8ee3f | 697 | if (data->current_msg->complete) { |
e8b17b5b MO |
698 | dev_dbg(&data->master->dev, |
699 | "%s:Invoking callback of SPI core\n", __func__); | |
700 | data->current_msg->complete(data->current_msg->context); | |
701 | } | |
702 | ||
703 | /* update status in global variable */ | |
704 | data->bcurrent_msg_processing = false; | |
705 | ||
706 | dev_dbg(&data->master->dev, | |
707 | "%s:data->bcurrent_msg_processing = false\n", __func__); | |
708 | ||
709 | data->current_msg = NULL; | |
710 | data->cur_trans = NULL; | |
711 | ||
65308c46 GL |
712 | /* check if we have items in list and not suspending |
713 | * return 1 if list empty */ | |
e8b17b5b | 714 | if ((list_empty(&data->queue) == 0) && |
65308c46 GL |
715 | (!data->board_dat->suspend_sts) && |
716 | (data->status != STATUS_EXITING)) { | |
e8b17b5b | 717 | /* We have some more work to do (either there is more tranint |
65308c46 GL |
718 | * bpw;sfer requests in the current message or there are |
719 | *more messages) | |
720 | */ | |
721 | dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__); | |
e8b17b5b | 722 | queue_work(data->wk, &data->work); |
65308c46 GL |
723 | } else if (data->board_dat->suspend_sts || |
724 | data->status == STATUS_EXITING) { | |
e8b17b5b MO |
725 | dev_dbg(&data->master->dev, |
726 | "%s suspend/remove initiated, flushing queue\n", | |
727 | __func__); | |
cd8d984f | 728 | list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { |
e8b17b5b MO |
729 | pmsg->status = -EIO; |
730 | ||
65308c46 | 731 | if (pmsg->complete) |
e8b17b5b MO |
732 | pmsg->complete(pmsg->context); |
733 | ||
734 | /* delete from queue */ | |
735 | list_del_init(&pmsg->queue); | |
736 | } | |
737 | } | |
738 | } | |
739 | ||
740 | static void pch_spi_set_ir(struct pch_spi_data *data) | |
741 | { | |
c37f3c27 TM |
742 | /* enable interrupts, set threshold, enable SPI */ |
743 | if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) | |
77e58efd | 744 | /* set receive threshold to PCH_RX_THOLD */ |
65308c46 | 745 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
c37f3c27 TM |
746 | PCH_RX_THOLD << SPCR_RFIC_FIELD | |
747 | SPCR_FIE_BIT | SPCR_RFIE_BIT | | |
748 | SPCR_ORIE_BIT | SPCR_SPE_BIT, | |
749 | MASK_RFIC_SPCR_BITS | PCH_ALL); | |
750 | else | |
77e58efd | 751 | /* set receive threshold to maximum */ |
65308c46 | 752 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
c37f3c27 TM |
753 | PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD | |
754 | SPCR_FIE_BIT | SPCR_ORIE_BIT | | |
755 | SPCR_SPE_BIT, | |
756 | MASK_RFIC_SPCR_BITS | PCH_ALL); | |
e8b17b5b MO |
757 | |
758 | /* Wait until the transfer completes; go to sleep after | |
759 | initiating the transfer. */ | |
760 | dev_dbg(&data->master->dev, | |
761 | "%s:waiting for transfer to get over\n", __func__); | |
762 | ||
763 | wait_event_interruptible(data->wait, data->transfer_complete); | |
764 | ||
e8b17b5b MO |
765 | /* clear all interrupts */ |
766 | pch_spi_writereg(data->master, PCH_SPSR, | |
65308c46 | 767 | pch_spi_readreg(data->master, PCH_SPSR)); |
c37f3c27 TM |
768 | /* Disable interrupts and SPI transfer */ |
769 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT); | |
770 | /* clear FIFO */ | |
771 | pch_spi_clear_fifo(data->master); | |
e8b17b5b MO |
772 | } |
773 | ||
774 | static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) | |
775 | { | |
776 | int j; | |
777 | u8 *rx_buf; | |
778 | u16 *rx_sbuf; | |
779 | ||
780 | /* copy Rx Data */ | |
65308c46 | 781 | if (!data->cur_trans->rx_buf) |
e8b17b5b MO |
782 | return; |
783 | ||
784 | if (bpw == 8) { | |
65308c46 GL |
785 | rx_buf = data->cur_trans->rx_buf; |
786 | for (j = 0; j < data->bpw_len; j++) | |
787 | *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; | |
e8b17b5b | 788 | } else { |
65308c46 GL |
789 | rx_sbuf = data->cur_trans->rx_buf; |
790 | for (j = 0; j < data->bpw_len; j++) | |
791 | *rx_sbuf++ = data->pkt_rx_buff[j]; | |
e8b17b5b MO |
792 | } |
793 | } | |
794 | ||
c37f3c27 TM |
795 | static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) |
796 | { | |
797 | int j; | |
798 | u8 *rx_buf; | |
799 | u16 *rx_sbuf; | |
800 | const u8 *rx_dma_buf; | |
801 | const u16 *rx_dma_sbuf; | |
802 | ||
803 | /* copy Rx Data */ | |
804 | if (!data->cur_trans->rx_buf) | |
805 | return; | |
806 | ||
807 | if (bpw == 8) { | |
808 | rx_buf = data->cur_trans->rx_buf; | |
809 | rx_dma_buf = data->dma.rx_buf_virt; | |
810 | for (j = 0; j < data->bpw_len; j++) | |
811 | *rx_buf++ = *rx_dma_buf++ & 0xFF; | |
7d05b3e8 | 812 | data->cur_trans->rx_buf = rx_buf; |
c37f3c27 TM |
813 | } else { |
814 | rx_sbuf = data->cur_trans->rx_buf; | |
815 | rx_dma_sbuf = data->dma.rx_buf_virt; | |
816 | for (j = 0; j < data->bpw_len; j++) | |
817 | *rx_sbuf++ = *rx_dma_sbuf++; | |
7d05b3e8 | 818 | data->cur_trans->rx_buf = rx_sbuf; |
c37f3c27 TM |
819 | } |
820 | } | |
821 | ||
25e803f9 | 822 | static int pch_spi_start_transfer(struct pch_spi_data *data) |
c37f3c27 TM |
823 | { |
824 | struct pch_spi_dma_ctrl *dma; | |
825 | unsigned long flags; | |
25e803f9 | 826 | int rtn; |
c37f3c27 TM |
827 | |
828 | dma = &data->dma; | |
829 | ||
830 | spin_lock_irqsave(&data->lock, flags); | |
831 | ||
832 | /* disable interrupts, SPI set enable */ | |
833 | pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL); | |
834 | ||
835 | spin_unlock_irqrestore(&data->lock, flags); | |
836 | ||
837 | /* Wait until the transfer completes; go to sleep after | |
838 | initiating the transfer. */ | |
839 | dev_dbg(&data->master->dev, | |
840 | "%s:waiting for transfer to get over\n", __func__); | |
25e803f9 TM |
841 | rtn = wait_event_interruptible_timeout(data->wait, |
842 | data->transfer_complete, | |
843 | msecs_to_jiffies(2 * HZ)); | |
7d05b3e8 TM |
844 | if (!rtn) |
845 | dev_err(&data->master->dev, | |
846 | "%s wait-event timeout\n", __func__); | |
c37f3c27 TM |
847 | |
848 | dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, | |
849 | DMA_FROM_DEVICE); | |
27504be5 TM |
850 | |
851 | dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent, | |
852 | DMA_FROM_DEVICE); | |
853 | memset(data->dma.tx_buf_virt, 0, PAGE_SIZE); | |
854 | ||
c37f3c27 TM |
855 | async_tx_ack(dma->desc_rx); |
856 | async_tx_ack(dma->desc_tx); | |
857 | kfree(dma->sg_tx_p); | |
858 | kfree(dma->sg_rx_p); | |
859 | ||
860 | spin_lock_irqsave(&data->lock, flags); | |
c37f3c27 TM |
861 | |
862 | /* clear fifo threshold, disable interrupts, disable SPI transfer */ | |
863 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, | |
864 | MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL | | |
865 | SPCR_SPE_BIT); | |
866 | /* clear all interrupts */ | |
867 | pch_spi_writereg(data->master, PCH_SPSR, | |
868 | pch_spi_readreg(data->master, PCH_SPSR)); | |
869 | /* clear FIFO */ | |
870 | pch_spi_clear_fifo(data->master); | |
871 | ||
872 | spin_unlock_irqrestore(&data->lock, flags); | |
25e803f9 TM |
873 | |
874 | return rtn; | |
c37f3c27 TM |
875 | } |
876 | ||
877 | static void pch_dma_rx_complete(void *arg) | |
878 | { | |
879 | struct pch_spi_data *data = arg; | |
880 | ||
881 | /* transfer is completed;inform pch_spi_process_messages_dma */ | |
882 | data->transfer_complete = true; | |
883 | wake_up_interruptible(&data->wait); | |
884 | } | |
885 | ||
886 | static bool pch_spi_filter(struct dma_chan *chan, void *slave) | |
887 | { | |
888 | struct pch_dma_slave *param = slave; | |
889 | ||
890 | if ((chan->chan_id == param->chan_id) && | |
891 | (param->dma_dev == chan->device->dev)) { | |
892 | chan->private = param; | |
893 | return true; | |
894 | } else { | |
895 | return false; | |
896 | } | |
897 | } | |
898 | ||
899 | static void pch_spi_request_dma(struct pch_spi_data *data, int bpw) | |
900 | { | |
901 | dma_cap_mask_t mask; | |
902 | struct dma_chan *chan; | |
903 | struct pci_dev *dma_dev; | |
904 | struct pch_dma_slave *param; | |
905 | struct pch_spi_dma_ctrl *dma; | |
906 | unsigned int width; | |
907 | ||
908 | if (bpw == 8) | |
909 | width = PCH_DMA_WIDTH_1_BYTE; | |
910 | else | |
911 | width = PCH_DMA_WIDTH_2_BYTES; | |
912 | ||
913 | dma = &data->dma; | |
914 | dma_cap_zero(mask); | |
915 | dma_cap_set(DMA_SLAVE, mask); | |
916 | ||
917 | /* Get DMA's dev information */ | |
ee2ece52 TM |
918 | dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number, |
919 | PCI_DEVFN(12, 0)); | |
c37f3c27 TM |
920 | |
921 | /* Set Tx DMA */ | |
922 | param = &dma->param_tx; | |
923 | param->dma_dev = &dma_dev->dev; | |
924 | param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */ | |
925 | param->tx_reg = data->io_base_addr + PCH_SPDWR; | |
926 | param->width = width; | |
927 | chan = dma_request_channel(mask, pch_spi_filter, param); | |
928 | if (!chan) { | |
929 | dev_err(&data->master->dev, | |
930 | "ERROR: dma_request_channel FAILS(Tx)\n"); | |
931 | data->use_dma = 0; | |
932 | return; | |
933 | } | |
934 | dma->chan_tx = chan; | |
935 | ||
936 | /* Set Rx DMA */ | |
937 | param = &dma->param_rx; | |
938 | param->dma_dev = &dma_dev->dev; | |
939 | param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */ | |
940 | param->rx_reg = data->io_base_addr + PCH_SPDRR; | |
941 | param->width = width; | |
942 | chan = dma_request_channel(mask, pch_spi_filter, param); | |
943 | if (!chan) { | |
944 | dev_err(&data->master->dev, | |
945 | "ERROR: dma_request_channel FAILS(Rx)\n"); | |
946 | dma_release_channel(dma->chan_tx); | |
947 | dma->chan_tx = NULL; | |
948 | data->use_dma = 0; | |
949 | return; | |
950 | } | |
951 | dma->chan_rx = chan; | |
952 | } | |
953 | ||
954 | static void pch_spi_release_dma(struct pch_spi_data *data) | |
955 | { | |
956 | struct pch_spi_dma_ctrl *dma; | |
957 | ||
958 | dma = &data->dma; | |
959 | if (dma->chan_tx) { | |
960 | dma_release_channel(dma->chan_tx); | |
961 | dma->chan_tx = NULL; | |
962 | } | |
963 | if (dma->chan_rx) { | |
964 | dma_release_channel(dma->chan_rx); | |
965 | dma->chan_rx = NULL; | |
966 | } | |
967 | return; | |
968 | } | |
969 | ||
970 | static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) | |
971 | { | |
972 | const u8 *tx_buf; | |
973 | const u16 *tx_sbuf; | |
974 | u8 *tx_dma_buf; | |
975 | u16 *tx_dma_sbuf; | |
976 | struct scatterlist *sg; | |
977 | struct dma_async_tx_descriptor *desc_tx; | |
978 | struct dma_async_tx_descriptor *desc_rx; | |
979 | int num; | |
980 | int i; | |
981 | int size; | |
982 | int rem; | |
7d05b3e8 | 983 | int head; |
c37f3c27 TM |
984 | unsigned long flags; |
985 | struct pch_spi_dma_ctrl *dma; | |
986 | ||
987 | dma = &data->dma; | |
988 | ||
989 | /* set baud rate if needed */ | |
990 | if (data->cur_trans->speed_hz) { | |
991 | dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); | |
992 | spin_lock_irqsave(&data->lock, flags); | |
993 | pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); | |
994 | spin_unlock_irqrestore(&data->lock, flags); | |
995 | } | |
996 | ||
997 | /* set bits per word if needed */ | |
998 | if (data->cur_trans->bits_per_word && | |
999 | (data->current_msg->spi->bits_per_word != | |
1000 | data->cur_trans->bits_per_word)) { | |
1001 | dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); | |
1002 | spin_lock_irqsave(&data->lock, flags); | |
1003 | pch_spi_set_bits_per_word(data->master, | |
1004 | data->cur_trans->bits_per_word); | |
1005 | spin_unlock_irqrestore(&data->lock, flags); | |
1006 | *bpw = data->cur_trans->bits_per_word; | |
1007 | } else { | |
1008 | *bpw = data->current_msg->spi->bits_per_word; | |
1009 | } | |
1010 | data->bpw_len = data->cur_trans->len / (*bpw / 8); | |
1011 | ||
7d05b3e8 TM |
1012 | if (data->bpw_len > PCH_BUF_SIZE) { |
1013 | data->bpw_len = PCH_BUF_SIZE; | |
1014 | data->cur_trans->len -= PCH_BUF_SIZE; | |
1015 | } | |
1016 | ||
c37f3c27 TM |
1017 | /* copy Tx Data */ |
1018 | if (data->cur_trans->tx_buf != NULL) { | |
1019 | if (*bpw == 8) { | |
1020 | tx_buf = data->cur_trans->tx_buf; | |
1021 | tx_dma_buf = dma->tx_buf_virt; | |
1022 | for (i = 0; i < data->bpw_len; i++) | |
1023 | *tx_dma_buf++ = *tx_buf++; | |
1024 | } else { | |
1025 | tx_sbuf = data->cur_trans->tx_buf; | |
1026 | tx_dma_sbuf = dma->tx_buf_virt; | |
1027 | for (i = 0; i < data->bpw_len; i++) | |
1028 | *tx_dma_sbuf++ = *tx_sbuf++; | |
1029 | } | |
1030 | } | |
7d05b3e8 TM |
1031 | |
1032 | /* Calculate Rx parameter for DMA transmitting */ | |
c37f3c27 | 1033 | if (data->bpw_len > PCH_DMA_TRANS_SIZE) { |
7d05b3e8 TM |
1034 | if (data->bpw_len % PCH_DMA_TRANS_SIZE) { |
1035 | num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; | |
1036 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE; | |
1037 | } else { | |
1038 | num = data->bpw_len / PCH_DMA_TRANS_SIZE; | |
1039 | rem = PCH_DMA_TRANS_SIZE; | |
1040 | } | |
c37f3c27 | 1041 | size = PCH_DMA_TRANS_SIZE; |
c37f3c27 TM |
1042 | } else { |
1043 | num = 1; | |
1044 | size = data->bpw_len; | |
1045 | rem = data->bpw_len; | |
1046 | } | |
1047 | dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n", | |
1048 | __func__, num, size, rem); | |
1049 | spin_lock_irqsave(&data->lock, flags); | |
1050 | ||
1051 | /* set receive fifo threshold and transmit fifo threshold */ | |
1052 | pch_spi_setclr_reg(data->master, PCH_SPCR, | |
1053 | ((size - 1) << SPCR_RFIC_FIELD) | | |
f3e03e2e | 1054 | (PCH_TX_THOLD << SPCR_TFIC_FIELD), |
c37f3c27 TM |
1055 | MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS); |
1056 | ||
1057 | spin_unlock_irqrestore(&data->lock, flags); | |
1058 | ||
1059 | /* RX */ | |
1060 | dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); | |
1061 | sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */ | |
1062 | /* offset, length setting */ | |
1063 | sg = dma->sg_rx_p; | |
1064 | for (i = 0; i < num; i++, sg++) { | |
f3e03e2e TM |
1065 | if (i == (num - 2)) { |
1066 | sg->offset = size * i; | |
1067 | sg->offset = sg->offset * (*bpw / 8); | |
c37f3c27 TM |
1068 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem, |
1069 | sg->offset); | |
1070 | sg_dma_len(sg) = rem; | |
f3e03e2e TM |
1071 | } else if (i == (num - 1)) { |
1072 | sg->offset = size * (i - 1) + rem; | |
1073 | sg->offset = sg->offset * (*bpw / 8); | |
1074 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, | |
1075 | sg->offset); | |
1076 | sg_dma_len(sg) = size; | |
c37f3c27 | 1077 | } else { |
f3e03e2e | 1078 | sg->offset = size * i; |
c37f3c27 TM |
1079 | sg->offset = sg->offset * (*bpw / 8); |
1080 | sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, | |
1081 | sg->offset); | |
1082 | sg_dma_len(sg) = size; | |
1083 | } | |
1084 | sg_dma_address(sg) = dma->rx_buf_dma + sg->offset; | |
1085 | } | |
1086 | sg = dma->sg_rx_p; | |
16052827 | 1087 | desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg, |
a485df4b | 1088 | num, DMA_DEV_TO_MEM, |
c37f3c27 TM |
1089 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1090 | if (!desc_rx) { | |
1091 | dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", | |
1092 | __func__); | |
1093 | return; | |
1094 | } | |
1095 | dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE); | |
1096 | desc_rx->callback = pch_dma_rx_complete; | |
1097 | desc_rx->callback_param = data; | |
1098 | dma->nent = num; | |
1099 | dma->desc_rx = desc_rx; | |
1100 | ||
7d05b3e8 TM |
1101 | /* Calculate Tx parameter for DMA transmitting */ |
1102 | if (data->bpw_len > PCH_MAX_FIFO_DEPTH) { | |
1103 | head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE; | |
1104 | if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) { | |
1105 | num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; | |
1106 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head; | |
1107 | } else { | |
1108 | num = data->bpw_len / PCH_DMA_TRANS_SIZE; | |
1109 | rem = data->bpw_len % PCH_DMA_TRANS_SIZE + | |
1110 | PCH_DMA_TRANS_SIZE - head; | |
1111 | } | |
f3e03e2e | 1112 | size = PCH_DMA_TRANS_SIZE; |
f3e03e2e TM |
1113 | } else { |
1114 | num = 1; | |
1115 | size = data->bpw_len; | |
1116 | rem = data->bpw_len; | |
7d05b3e8 | 1117 | head = 0; |
f3e03e2e TM |
1118 | } |
1119 | ||
c37f3c27 TM |
1120 | dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); |
1121 | sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */ | |
1122 | /* offset, length setting */ | |
1123 | sg = dma->sg_tx_p; | |
1124 | for (i = 0; i < num; i++, sg++) { | |
1125 | if (i == 0) { | |
1126 | sg->offset = 0; | |
7d05b3e8 TM |
1127 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head, |
1128 | sg->offset); | |
1129 | sg_dma_len(sg) = size + head; | |
1130 | } else if (i == (num - 1)) { | |
1131 | sg->offset = head + size * i; | |
1132 | sg->offset = sg->offset * (*bpw / 8); | |
c37f3c27 TM |
1133 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, |
1134 | sg->offset); | |
1135 | sg_dma_len(sg) = rem; | |
1136 | } else { | |
7d05b3e8 | 1137 | sg->offset = head + size * i; |
c37f3c27 TM |
1138 | sg->offset = sg->offset * (*bpw / 8); |
1139 | sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, | |
1140 | sg->offset); | |
1141 | sg_dma_len(sg) = size; | |
1142 | } | |
1143 | sg_dma_address(sg) = dma->tx_buf_dma + sg->offset; | |
1144 | } | |
1145 | sg = dma->sg_tx_p; | |
16052827 | 1146 | desc_tx = dmaengine_prep_slave_sg(dma->chan_tx, |
a485df4b | 1147 | sg, num, DMA_MEM_TO_DEV, |
c37f3c27 TM |
1148 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); |
1149 | if (!desc_tx) { | |
1150 | dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", | |
1151 | __func__); | |
1152 | return; | |
1153 | } | |
1154 | dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE); | |
1155 | desc_tx->callback = NULL; | |
1156 | desc_tx->callback_param = data; | |
1157 | dma->nent = num; | |
1158 | dma->desc_tx = desc_tx; | |
1159 | ||
1160 | dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " | |
1161 | "0x2 to SSNXCR\n", __func__); | |
1162 | ||
1163 | spin_lock_irqsave(&data->lock, flags); | |
1164 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); | |
1165 | desc_rx->tx_submit(desc_rx); | |
1166 | desc_tx->tx_submit(desc_tx); | |
1167 | spin_unlock_irqrestore(&data->lock, flags); | |
1168 | ||
1169 | /* reset transfer complete flag */ | |
1170 | data->transfer_complete = false; | |
1171 | } | |
e8b17b5b MO |
1172 | |
1173 | static void pch_spi_process_messages(struct work_struct *pwork) | |
1174 | { | |
cd8d984f | 1175 | struct spi_message *pmsg, *tmp; |
65308c46 | 1176 | struct pch_spi_data *data; |
e8b17b5b MO |
1177 | int bpw; |
1178 | ||
65308c46 | 1179 | data = container_of(pwork, struct pch_spi_data, work); |
8e41b527 | 1180 | dev_dbg(&data->master->dev, "%s data initialized\n", __func__); |
e8b17b5b MO |
1181 | |
1182 | spin_lock(&data->lock); | |
e8b17b5b | 1183 | /* check if suspend has been initiated;if yes flush queue */ |
65308c46 | 1184 | if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) { |
f6bd03a7 JN |
1185 | dev_dbg(&data->master->dev, |
1186 | "%s suspend/remove initiated, flushing queue\n", __func__); | |
cd8d984f | 1187 | list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) { |
e8b17b5b MO |
1188 | pmsg->status = -EIO; |
1189 | ||
f5d8ee3f | 1190 | if (pmsg->complete) { |
e8b17b5b MO |
1191 | spin_unlock(&data->lock); |
1192 | pmsg->complete(pmsg->context); | |
1193 | spin_lock(&data->lock); | |
1194 | } | |
1195 | ||
1196 | /* delete from queue */ | |
1197 | list_del_init(&pmsg->queue); | |
1198 | } | |
1199 | ||
1200 | spin_unlock(&data->lock); | |
1201 | return; | |
1202 | } | |
1203 | ||
1204 | data->bcurrent_msg_processing = true; | |
1205 | dev_dbg(&data->master->dev, | |
1206 | "%s Set data->bcurrent_msg_processing= true\n", __func__); | |
1207 | ||
1208 | /* Get the message from the queue and delete it from there. */ | |
65308c46 GL |
1209 | data->current_msg = list_entry(data->queue.next, struct spi_message, |
1210 | queue); | |
e8b17b5b MO |
1211 | |
1212 | list_del_init(&data->current_msg->queue); | |
1213 | ||
1214 | data->current_msg->status = 0; | |
1215 | ||
1216 | pch_spi_select_chip(data, data->current_msg->spi); | |
1217 | ||
1218 | spin_unlock(&data->lock); | |
1219 | ||
c37f3c27 TM |
1220 | if (data->use_dma) |
1221 | pch_spi_request_dma(data, | |
1222 | data->current_msg->spi->bits_per_word); | |
8b7aa961 | 1223 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); |
e8b17b5b | 1224 | do { |
7d05b3e8 | 1225 | int cnt; |
e8b17b5b MO |
1226 | /* If we are already processing a message get the next |
1227 | transfer structure from the message otherwise retrieve | |
1228 | the 1st transfer request from the message. */ | |
1229 | spin_lock(&data->lock); | |
e8b17b5b MO |
1230 | if (data->cur_trans == NULL) { |
1231 | data->cur_trans = | |
c37f3c27 TM |
1232 | list_entry(data->current_msg->transfers.next, |
1233 | struct spi_transfer, transfer_list); | |
1234 | dev_dbg(&data->master->dev, "%s " | |
1235 | ":Getting 1st transfer message\n", __func__); | |
e8b17b5b MO |
1236 | } else { |
1237 | data->cur_trans = | |
c37f3c27 TM |
1238 | list_entry(data->cur_trans->transfer_list.next, |
1239 | struct spi_transfer, transfer_list); | |
1240 | dev_dbg(&data->master->dev, "%s " | |
1241 | ":Getting next transfer message\n", __func__); | |
e8b17b5b | 1242 | } |
e8b17b5b MO |
1243 | spin_unlock(&data->lock); |
1244 | ||
7d05b3e8 TM |
1245 | if (!data->cur_trans->len) |
1246 | goto out; | |
1247 | cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1; | |
1248 | data->save_total_len = data->cur_trans->len; | |
c37f3c27 | 1249 | if (data->use_dma) { |
7d05b3e8 TM |
1250 | int i; |
1251 | char *save_rx_buf = data->cur_trans->rx_buf; | |
1252 | for (i = 0; i < cnt; i ++) { | |
1253 | pch_spi_handle_dma(data, &bpw); | |
0f57e168 TM |
1254 | if (!pch_spi_start_transfer(data)) { |
1255 | data->transfer_complete = true; | |
1256 | data->current_msg->status = -EIO; | |
1257 | data->current_msg->complete | |
1258 | (data->current_msg->context); | |
1259 | data->bcurrent_msg_processing = false; | |
1260 | data->current_msg = NULL; | |
1261 | data->cur_trans = NULL; | |
7d05b3e8 | 1262 | goto out; |
0f57e168 | 1263 | } |
7d05b3e8 TM |
1264 | pch_spi_copy_rx_data_for_dma(data, bpw); |
1265 | } | |
1266 | data->cur_trans->rx_buf = save_rx_buf; | |
c37f3c27 TM |
1267 | } else { |
1268 | pch_spi_set_tx(data, &bpw); | |
1269 | pch_spi_set_ir(data); | |
1270 | pch_spi_copy_rx_data(data, bpw); | |
1271 | kfree(data->pkt_rx_buff); | |
1272 | data->pkt_rx_buff = NULL; | |
1273 | kfree(data->pkt_tx_buff); | |
1274 | data->pkt_tx_buff = NULL; | |
1275 | } | |
e8b17b5b | 1276 | /* increment message count */ |
7d05b3e8 | 1277 | data->cur_trans->len = data->save_total_len; |
e8b17b5b MO |
1278 | data->current_msg->actual_length += data->cur_trans->len; |
1279 | ||
1280 | dev_dbg(&data->master->dev, | |
1281 | "%s:data->current_msg->actual_length=%d\n", | |
1282 | __func__, data->current_msg->actual_length); | |
1283 | ||
1284 | /* check for delay */ | |
1285 | if (data->cur_trans->delay_usecs) { | |
1286 | dev_dbg(&data->master->dev, "%s:" | |
1287 | "delay in usec=%d\n", __func__, | |
1288 | data->cur_trans->delay_usecs); | |
1289 | udelay(data->cur_trans->delay_usecs); | |
1290 | } | |
1291 | ||
1292 | spin_lock(&data->lock); | |
1293 | ||
1294 | /* No more transfer in this message. */ | |
1295 | if ((data->cur_trans->transfer_list.next) == | |
1296 | &(data->current_msg->transfers)) { | |
c37f3c27 | 1297 | pch_spi_nomore_transfer(data); |
e8b17b5b MO |
1298 | } |
1299 | ||
1300 | spin_unlock(&data->lock); | |
1301 | ||
65308c46 | 1302 | } while (data->cur_trans != NULL); |
c37f3c27 | 1303 | |
25e803f9 | 1304 | out: |
8b7aa961 | 1305 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); |
c37f3c27 TM |
1306 | if (data->use_dma) |
1307 | pch_spi_release_dma(data); | |
e8b17b5b MO |
1308 | } |
1309 | ||
f016aeb6 TM |
1310 | static void pch_spi_free_resources(struct pch_spi_board_data *board_dat, |
1311 | struct pch_spi_data *data) | |
e8b17b5b MO |
1312 | { |
1313 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); | |
1314 | ||
1315 | /* free workqueue */ | |
f016aeb6 TM |
1316 | if (data->wk != NULL) { |
1317 | destroy_workqueue(data->wk); | |
1318 | data->wk = NULL; | |
e8b17b5b MO |
1319 | dev_dbg(&board_dat->pdev->dev, |
1320 | "%s destroy_workqueue invoked successfully\n", | |
1321 | __func__); | |
1322 | } | |
e8b17b5b MO |
1323 | } |
1324 | ||
f016aeb6 TM |
1325 | static int pch_spi_get_resources(struct pch_spi_board_data *board_dat, |
1326 | struct pch_spi_data *data) | |
e8b17b5b | 1327 | { |
f016aeb6 TM |
1328 | int retval = 0; |
1329 | ||
e8b17b5b MO |
1330 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); |
1331 | ||
e8b17b5b | 1332 | /* create workqueue */ |
f016aeb6 TM |
1333 | data->wk = create_singlethread_workqueue(KBUILD_MODNAME); |
1334 | if (!data->wk) { | |
e8b17b5b MO |
1335 | dev_err(&board_dat->pdev->dev, |
1336 | "%s create_singlet hread_workqueue failed\n", __func__); | |
1337 | retval = -EBUSY; | |
1338 | goto err_return; | |
1339 | } | |
1340 | ||
e8b17b5b | 1341 | /* reset PCH SPI h/w */ |
f016aeb6 | 1342 | pch_spi_reset(data->master); |
e8b17b5b MO |
1343 | dev_dbg(&board_dat->pdev->dev, |
1344 | "%s pch_spi_reset invoked successfully\n", __func__); | |
1345 | ||
65308c46 | 1346 | dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); |
e8b17b5b MO |
1347 | |
1348 | err_return: | |
1349 | if (retval != 0) { | |
1350 | dev_err(&board_dat->pdev->dev, | |
1351 | "%s FAIL:invoking pch_spi_free_resources\n", __func__); | |
f016aeb6 | 1352 | pch_spi_free_resources(board_dat, data); |
e8b17b5b MO |
1353 | } |
1354 | ||
1355 | dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval); | |
1356 | ||
1357 | return retval; | |
1358 | } | |
1359 | ||
c37f3c27 TM |
1360 | static void pch_free_dma_buf(struct pch_spi_board_data *board_dat, |
1361 | struct pch_spi_data *data) | |
1362 | { | |
1363 | struct pch_spi_dma_ctrl *dma; | |
1364 | ||
1365 | dma = &data->dma; | |
1366 | if (dma->tx_buf_dma) | |
1367 | dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, | |
1368 | dma->tx_buf_virt, dma->tx_buf_dma); | |
1369 | if (dma->rx_buf_dma) | |
1370 | dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, | |
1371 | dma->rx_buf_virt, dma->rx_buf_dma); | |
1372 | return; | |
1373 | } | |
1374 | ||
1375 | static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat, | |
1376 | struct pch_spi_data *data) | |
1377 | { | |
1378 | struct pch_spi_dma_ctrl *dma; | |
1379 | ||
1380 | dma = &data->dma; | |
1381 | /* Get Consistent memory for Tx DMA */ | |
1382 | dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, | |
1383 | PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL); | |
1384 | /* Get Consistent memory for Rx DMA */ | |
1385 | dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, | |
1386 | PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL); | |
1387 | } | |
1388 | ||
fd4a319b | 1389 | static int pch_spi_pd_probe(struct platform_device *plat_dev) |
e8b17b5b | 1390 | { |
f016aeb6 | 1391 | int ret; |
e8b17b5b | 1392 | struct spi_master *master; |
f016aeb6 TM |
1393 | struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); |
1394 | struct pch_spi_data *data; | |
e8b17b5b | 1395 | |
c37f3c27 TM |
1396 | dev_dbg(&plat_dev->dev, "%s:debug\n", __func__); |
1397 | ||
f016aeb6 TM |
1398 | master = spi_alloc_master(&board_dat->pdev->dev, |
1399 | sizeof(struct pch_spi_data)); | |
1400 | if (!master) { | |
1401 | dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n", | |
1402 | plat_dev->id); | |
1403 | return -ENOMEM; | |
e8b17b5b MO |
1404 | } |
1405 | ||
f016aeb6 TM |
1406 | data = spi_master_get_devdata(master); |
1407 | data->master = master; | |
e8b17b5b | 1408 | |
f016aeb6 | 1409 | platform_set_drvdata(plat_dev, data); |
e8b17b5b | 1410 | |
c37f3c27 TM |
1411 | /* baseaddress + address offset) */ |
1412 | data->io_base_addr = pci_resource_start(board_dat->pdev, 1) + | |
1413 | PCH_ADDRESS_SIZE * plat_dev->id; | |
9553821e | 1414 | data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0); |
f016aeb6 TM |
1415 | if (!data->io_remap_addr) { |
1416 | dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__); | |
1417 | ret = -ENOMEM; | |
1418 | goto err_pci_iomap; | |
e8b17b5b | 1419 | } |
9553821e | 1420 | data->io_remap_addr += PCH_ADDRESS_SIZE * plat_dev->id; |
e8b17b5b | 1421 | |
f016aeb6 TM |
1422 | dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n", |
1423 | plat_dev->id, data->io_remap_addr); | |
e8b17b5b MO |
1424 | |
1425 | /* initialize members of SPI master */ | |
e8b17b5b MO |
1426 | master->num_chipselect = PCH_MAX_CS; |
1427 | master->setup = pch_spi_setup; | |
1428 | master->transfer = pch_spi_transfer; | |
f258b44e | 1429 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; |
24778be2 | 1430 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); |
e8b17b5b | 1431 | |
f016aeb6 TM |
1432 | data->board_dat = board_dat; |
1433 | data->plat_dev = plat_dev; | |
1434 | data->n_curnt_chip = 255; | |
1435 | data->status = STATUS_RUNNING; | |
1436 | data->ch = plat_dev->id; | |
c37f3c27 | 1437 | data->use_dma = use_dma; |
e8b17b5b | 1438 | |
f016aeb6 TM |
1439 | INIT_LIST_HEAD(&data->queue); |
1440 | spin_lock_init(&data->lock); | |
1441 | INIT_WORK(&data->work, pch_spi_process_messages); | |
1442 | init_waitqueue_head(&data->wait); | |
65308c46 | 1443 | |
f016aeb6 TM |
1444 | ret = pch_spi_get_resources(board_dat, data); |
1445 | if (ret) { | |
1446 | dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret); | |
e8b17b5b MO |
1447 | goto err_spi_get_resources; |
1448 | } | |
1449 | ||
f016aeb6 TM |
1450 | ret = request_irq(board_dat->pdev->irq, pch_spi_handler, |
1451 | IRQF_SHARED, KBUILD_MODNAME, data); | |
1452 | if (ret) { | |
1453 | dev_err(&plat_dev->dev, | |
1454 | "%s request_irq failed\n", __func__); | |
1455 | goto err_request_irq; | |
1456 | } | |
1457 | data->irq_reg_sts = true; | |
e8b17b5b | 1458 | |
e8b17b5b | 1459 | pch_spi_set_master_mode(master); |
e8b17b5b | 1460 | |
f016aeb6 TM |
1461 | ret = spi_register_master(master); |
1462 | if (ret != 0) { | |
1463 | dev_err(&plat_dev->dev, | |
e8b17b5b | 1464 | "%s spi_register_master FAILED\n", __func__); |
f016aeb6 | 1465 | goto err_spi_register_master; |
e8b17b5b MO |
1466 | } |
1467 | ||
c37f3c27 TM |
1468 | if (use_dma) { |
1469 | dev_info(&plat_dev->dev, "Use DMA for data transfers\n"); | |
1470 | pch_alloc_dma_buf(board_dat, data); | |
1471 | } | |
1472 | ||
e8b17b5b MO |
1473 | return 0; |
1474 | ||
f016aeb6 | 1475 | err_spi_register_master: |
e1e57628 | 1476 | free_irq(board_dat->pdev->irq, data); |
f016aeb6 TM |
1477 | err_request_irq: |
1478 | pch_spi_free_resources(board_dat, data); | |
e8b17b5b | 1479 | err_spi_get_resources: |
f016aeb6 TM |
1480 | pci_iounmap(board_dat->pdev, data->io_remap_addr); |
1481 | err_pci_iomap: | |
e8b17b5b | 1482 | spi_master_put(master); |
f016aeb6 TM |
1483 | |
1484 | return ret; | |
e8b17b5b MO |
1485 | } |
1486 | ||
fd4a319b | 1487 | static int pch_spi_pd_remove(struct platform_device *plat_dev) |
e8b17b5b | 1488 | { |
f016aeb6 TM |
1489 | struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); |
1490 | struct pch_spi_data *data = platform_get_drvdata(plat_dev); | |
65308c46 | 1491 | int count; |
c37f3c27 | 1492 | unsigned long flags; |
e8b17b5b | 1493 | |
f016aeb6 TM |
1494 | dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n", |
1495 | __func__, plat_dev->id, board_dat->pdev->irq); | |
c37f3c27 TM |
1496 | |
1497 | if (use_dma) | |
1498 | pch_free_dma_buf(board_dat, data); | |
1499 | ||
65308c46 GL |
1500 | /* check for any pending messages; no action is taken if the queue |
1501 | * is still full; but at least we tried. Unload anyway */ | |
1502 | count = 500; | |
c37f3c27 | 1503 | spin_lock_irqsave(&data->lock, flags); |
f016aeb6 TM |
1504 | data->status = STATUS_EXITING; |
1505 | while ((list_empty(&data->queue) == 0) && --count) { | |
65308c46 GL |
1506 | dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", |
1507 | __func__); | |
c37f3c27 | 1508 | spin_unlock_irqrestore(&data->lock, flags); |
65308c46 | 1509 | msleep(PCH_SLEEP_TIME); |
c37f3c27 | 1510 | spin_lock_irqsave(&data->lock, flags); |
e8b17b5b | 1511 | } |
c37f3c27 | 1512 | spin_unlock_irqrestore(&data->lock, flags); |
e8b17b5b | 1513 | |
f016aeb6 TM |
1514 | pch_spi_free_resources(board_dat, data); |
1515 | /* disable interrupts & free IRQ */ | |
1516 | if (data->irq_reg_sts) { | |
1517 | /* disable interrupts */ | |
1518 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); | |
1519 | data->irq_reg_sts = false; | |
1520 | free_irq(board_dat->pdev->irq, data); | |
1521 | } | |
e8b17b5b | 1522 | |
f016aeb6 TM |
1523 | pci_iounmap(board_dat->pdev, data->io_remap_addr); |
1524 | spi_unregister_master(data->master); | |
e8b17b5b | 1525 | |
f016aeb6 | 1526 | return 0; |
e8b17b5b | 1527 | } |
e8b17b5b | 1528 | #ifdef CONFIG_PM |
f016aeb6 TM |
1529 | static int pch_spi_pd_suspend(struct platform_device *pd_dev, |
1530 | pm_message_t state) | |
e8b17b5b MO |
1531 | { |
1532 | u8 count; | |
f016aeb6 TM |
1533 | struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); |
1534 | struct pch_spi_data *data = platform_get_drvdata(pd_dev); | |
e8b17b5b | 1535 | |
f016aeb6 | 1536 | dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__); |
e8b17b5b MO |
1537 | |
1538 | if (!board_dat) { | |
f016aeb6 | 1539 | dev_err(&pd_dev->dev, |
e8b17b5b MO |
1540 | "%s pci_get_drvdata returned NULL\n", __func__); |
1541 | return -EFAULT; | |
1542 | } | |
1543 | ||
e8b17b5b MO |
1544 | /* check if the current message is processed: |
1545 | Only after thats done the transfer will be suspended */ | |
1546 | count = 255; | |
c37f3c27 TM |
1547 | while ((--count) > 0) { |
1548 | if (!(data->bcurrent_msg_processing)) | |
e8b17b5b | 1549 | break; |
e8b17b5b MO |
1550 | msleep(PCH_SLEEP_TIME); |
1551 | } | |
1552 | ||
1553 | /* Free IRQ */ | |
f016aeb6 | 1554 | if (data->irq_reg_sts) { |
e8b17b5b | 1555 | /* disable all interrupts */ |
f016aeb6 TM |
1556 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); |
1557 | pch_spi_reset(data->master); | |
1558 | free_irq(board_dat->pdev->irq, data); | |
e8b17b5b | 1559 | |
f016aeb6 TM |
1560 | data->irq_reg_sts = false; |
1561 | dev_dbg(&pd_dev->dev, | |
e8b17b5b MO |
1562 | "%s free_irq invoked successfully.\n", __func__); |
1563 | } | |
1564 | ||
f016aeb6 TM |
1565 | return 0; |
1566 | } | |
1567 | ||
1568 | static int pch_spi_pd_resume(struct platform_device *pd_dev) | |
1569 | { | |
1570 | struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); | |
1571 | struct pch_spi_data *data = platform_get_drvdata(pd_dev); | |
1572 | int retval; | |
1573 | ||
1574 | if (!board_dat) { | |
1575 | dev_err(&pd_dev->dev, | |
1576 | "%s pci_get_drvdata returned NULL\n", __func__); | |
1577 | return -EFAULT; | |
1578 | } | |
1579 | ||
1580 | if (!data->irq_reg_sts) { | |
1581 | /* register IRQ */ | |
1582 | retval = request_irq(board_dat->pdev->irq, pch_spi_handler, | |
1583 | IRQF_SHARED, KBUILD_MODNAME, data); | |
1584 | if (retval < 0) { | |
1585 | dev_err(&pd_dev->dev, | |
1586 | "%s request_irq failed\n", __func__); | |
1587 | return retval; | |
1588 | } | |
1589 | ||
1590 | /* reset PCH SPI h/w */ | |
1591 | pch_spi_reset(data->master); | |
1592 | pch_spi_set_master_mode(data->master); | |
1593 | data->irq_reg_sts = true; | |
1594 | } | |
1595 | return 0; | |
1596 | } | |
1597 | #else | |
1598 | #define pch_spi_pd_suspend NULL | |
1599 | #define pch_spi_pd_resume NULL | |
1600 | #endif | |
1601 | ||
1602 | static struct platform_driver pch_spi_pd_driver = { | |
1603 | .driver = { | |
1604 | .name = "pch-spi", | |
1605 | .owner = THIS_MODULE, | |
1606 | }, | |
1607 | .probe = pch_spi_pd_probe, | |
fd4a319b | 1608 | .remove = pch_spi_pd_remove, |
f016aeb6 TM |
1609 | .suspend = pch_spi_pd_suspend, |
1610 | .resume = pch_spi_pd_resume | |
1611 | }; | |
1612 | ||
fd4a319b | 1613 | static int pch_spi_probe(struct pci_dev *pdev, |
f016aeb6 TM |
1614 | const struct pci_device_id *id) |
1615 | { | |
1616 | struct pch_spi_board_data *board_dat; | |
1617 | struct platform_device *pd_dev = NULL; | |
1618 | int retval; | |
1619 | int i; | |
1620 | struct pch_pd_dev_save *pd_dev_save; | |
1621 | ||
1622 | pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL); | |
1623 | if (!pd_dev_save) { | |
1624 | dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__); | |
1625 | return -ENOMEM; | |
1626 | } | |
1627 | ||
1628 | board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL); | |
1629 | if (!board_dat) { | |
1630 | dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__); | |
1631 | retval = -ENOMEM; | |
1632 | goto err_no_mem; | |
1633 | } | |
1634 | ||
1635 | retval = pci_request_regions(pdev, KBUILD_MODNAME); | |
1636 | if (retval) { | |
1637 | dev_err(&pdev->dev, "%s request_region failed\n", __func__); | |
1638 | goto pci_request_regions; | |
1639 | } | |
1640 | ||
1641 | board_dat->pdev = pdev; | |
1642 | board_dat->num = id->driver_data; | |
1643 | pd_dev_save->num = id->driver_data; | |
1644 | pd_dev_save->board_dat = board_dat; | |
1645 | ||
1646 | retval = pci_enable_device(pdev); | |
1647 | if (retval) { | |
1648 | dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__); | |
1649 | goto pci_enable_device; | |
1650 | } | |
1651 | ||
1652 | for (i = 0; i < board_dat->num; i++) { | |
1653 | pd_dev = platform_device_alloc("pch-spi", i); | |
1654 | if (!pd_dev) { | |
1655 | dev_err(&pdev->dev, "platform_device_alloc failed\n"); | |
bac902d5 | 1656 | retval = -ENOMEM; |
f016aeb6 TM |
1657 | goto err_platform_device; |
1658 | } | |
1659 | pd_dev_save->pd_save[i] = pd_dev; | |
1660 | pd_dev->dev.parent = &pdev->dev; | |
1661 | ||
1662 | retval = platform_device_add_data(pd_dev, board_dat, | |
1663 | sizeof(*board_dat)); | |
1664 | if (retval) { | |
1665 | dev_err(&pdev->dev, | |
1666 | "platform_device_add_data failed\n"); | |
1667 | platform_device_put(pd_dev); | |
1668 | goto err_platform_device; | |
1669 | } | |
1670 | ||
1671 | retval = platform_device_add(pd_dev); | |
1672 | if (retval) { | |
1673 | dev_err(&pdev->dev, "platform_device_add failed\n"); | |
1674 | platform_device_put(pd_dev); | |
1675 | goto err_platform_device; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | pci_set_drvdata(pdev, pd_dev_save); | |
1680 | ||
1681 | return 0; | |
1682 | ||
1683 | err_platform_device: | |
1684 | pci_disable_device(pdev); | |
1685 | pci_enable_device: | |
1686 | pci_release_regions(pdev); | |
1687 | pci_request_regions: | |
1688 | kfree(board_dat); | |
1689 | err_no_mem: | |
1690 | kfree(pd_dev_save); | |
1691 | ||
1692 | return retval; | |
1693 | } | |
1694 | ||
fd4a319b | 1695 | static void pch_spi_remove(struct pci_dev *pdev) |
f016aeb6 TM |
1696 | { |
1697 | int i; | |
1698 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); | |
1699 | ||
1700 | dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev); | |
1701 | ||
1702 | for (i = 0; i < pd_dev_save->num; i++) | |
1703 | platform_device_unregister(pd_dev_save->pd_save[i]); | |
1704 | ||
1705 | pci_disable_device(pdev); | |
1706 | pci_release_regions(pdev); | |
1707 | kfree(pd_dev_save->board_dat); | |
1708 | kfree(pd_dev_save); | |
1709 | } | |
1710 | ||
1711 | #ifdef CONFIG_PM | |
1712 | static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state) | |
1713 | { | |
1714 | int retval; | |
1715 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); | |
1716 | ||
1717 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); | |
1718 | ||
1719 | pd_dev_save->board_dat->suspend_sts = true; | |
1720 | ||
e8b17b5b MO |
1721 | /* save config space */ |
1722 | retval = pci_save_state(pdev); | |
e8b17b5b | 1723 | if (retval == 0) { |
e8b17b5b | 1724 | pci_enable_wake(pdev, PCI_D3hot, 0); |
e8b17b5b | 1725 | pci_disable_device(pdev); |
e8b17b5b | 1726 | pci_set_power_state(pdev, PCI_D3hot); |
e8b17b5b MO |
1727 | } else { |
1728 | dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__); | |
1729 | } | |
1730 | ||
e8b17b5b MO |
1731 | return retval; |
1732 | } | |
1733 | ||
1734 | static int pch_spi_resume(struct pci_dev *pdev) | |
1735 | { | |
1736 | int retval; | |
f016aeb6 | 1737 | struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); |
e8b17b5b MO |
1738 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
1739 | ||
e8b17b5b | 1740 | pci_set_power_state(pdev, PCI_D0); |
e8b17b5b MO |
1741 | pci_restore_state(pdev); |
1742 | ||
1743 | retval = pci_enable_device(pdev); | |
1744 | if (retval < 0) { | |
1745 | dev_err(&pdev->dev, | |
1746 | "%s pci_enable_device failed\n", __func__); | |
1747 | } else { | |
e8b17b5b MO |
1748 | pci_enable_wake(pdev, PCI_D3hot, 0); |
1749 | ||
f016aeb6 TM |
1750 | /* set suspend status to false */ |
1751 | pd_dev_save->board_dat->suspend_sts = false; | |
e8b17b5b MO |
1752 | } |
1753 | ||
e8b17b5b MO |
1754 | return retval; |
1755 | } | |
1756 | #else | |
1757 | #define pch_spi_suspend NULL | |
1758 | #define pch_spi_resume NULL | |
1759 | ||
1760 | #endif | |
1761 | ||
c88db233 | 1762 | static struct pci_driver pch_spi_pcidev_driver = { |
e8b17b5b MO |
1763 | .name = "pch_spi", |
1764 | .id_table = pch_spi_pcidev_id, | |
1765 | .probe = pch_spi_probe, | |
fd4a319b | 1766 | .remove = pch_spi_remove, |
e8b17b5b MO |
1767 | .suspend = pch_spi_suspend, |
1768 | .resume = pch_spi_resume, | |
1769 | }; | |
1770 | ||
1771 | static int __init pch_spi_init(void) | |
1772 | { | |
f016aeb6 TM |
1773 | int ret; |
1774 | ret = platform_driver_register(&pch_spi_pd_driver); | |
1775 | if (ret) | |
1776 | return ret; | |
1777 | ||
c88db233 | 1778 | ret = pci_register_driver(&pch_spi_pcidev_driver); |
0113f22e WY |
1779 | if (ret) { |
1780 | platform_driver_unregister(&pch_spi_pd_driver); | |
f016aeb6 | 1781 | return ret; |
0113f22e | 1782 | } |
f016aeb6 TM |
1783 | |
1784 | return 0; | |
e8b17b5b MO |
1785 | } |
1786 | module_init(pch_spi_init); | |
1787 | ||
e8b17b5b MO |
1788 | static void __exit pch_spi_exit(void) |
1789 | { | |
c88db233 | 1790 | pci_unregister_driver(&pch_spi_pcidev_driver); |
f016aeb6 | 1791 | platform_driver_unregister(&pch_spi_pd_driver); |
e8b17b5b MO |
1792 | } |
1793 | module_exit(pch_spi_exit); | |
1794 | ||
c37f3c27 TM |
1795 | module_param(use_dma, int, 0644); |
1796 | MODULE_PARM_DESC(use_dma, | |
1797 | "to use DMA for data transfers pass 1 else 0; default 1"); | |
1798 | ||
e8b17b5b | 1799 | MODULE_LICENSE("GPL"); |
2b246283 | 1800 | MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver"); |
2f1603c6 AS |
1801 | MODULE_DEVICE_TABLE(pci, pch_spi_pcidev_id); |
1802 |