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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-2.6-block.git] / drivers / spi / spi-zynqmp-gqspi.c
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver
4 * (host mode only)
5 *
6 * Copyright (C) 2009 - 2015 Xilinx, Inc.
7 */
8
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/dma-mapping.h>
12#include <linux/dmaengine.h>
13#include <linux/firmware/xlnx-zynqmp.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm_runtime.h>
20#include <linux/spi/spi.h>
21#include <linux/spinlock.h>
22#include <linux/workqueue.h>
23#include <linux/spi/spi-mem.h>
24
25/* Generic QSPI register offsets */
26#define GQSPI_CONFIG_OFST 0x00000100
27#define GQSPI_ISR_OFST 0x00000104
28#define GQSPI_IDR_OFST 0x0000010C
29#define GQSPI_IER_OFST 0x00000108
30#define GQSPI_IMASK_OFST 0x00000110
31#define GQSPI_EN_OFST 0x00000114
32#define GQSPI_TXD_OFST 0x0000011C
33#define GQSPI_RXD_OFST 0x00000120
34#define GQSPI_TX_THRESHOLD_OFST 0x00000128
35#define GQSPI_RX_THRESHOLD_OFST 0x0000012C
36#define IOU_TAPDLY_BYPASS_OFST 0x0000003C
37#define GQSPI_LPBK_DLY_ADJ_OFST 0x00000138
38#define GQSPI_GEN_FIFO_OFST 0x00000140
39#define GQSPI_SEL_OFST 0x00000144
40#define GQSPI_GF_THRESHOLD_OFST 0x00000150
41#define GQSPI_FIFO_CTRL_OFST 0x0000014C
42#define GQSPI_QSPIDMA_DST_CTRL_OFST 0x0000080C
43#define GQSPI_QSPIDMA_DST_SIZE_OFST 0x00000804
44#define GQSPI_QSPIDMA_DST_STS_OFST 0x00000808
45#define GQSPI_QSPIDMA_DST_I_STS_OFST 0x00000814
46#define GQSPI_QSPIDMA_DST_I_EN_OFST 0x00000818
47#define GQSPI_QSPIDMA_DST_I_DIS_OFST 0x0000081C
48#define GQSPI_QSPIDMA_DST_I_MASK_OFST 0x00000820
49#define GQSPI_QSPIDMA_DST_ADDR_OFST 0x00000800
50#define GQSPI_QSPIDMA_DST_ADDR_MSB_OFST 0x00000828
51#define GQSPI_DATA_DLY_ADJ_OFST 0x000001F8
52
53/* GQSPI register bit masks */
54#define GQSPI_SEL_MASK 0x00000001
55#define GQSPI_EN_MASK 0x00000001
56#define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK 0x00000020
57#define GQSPI_ISR_WR_TO_CLR_MASK 0x00000002
58#define GQSPI_IDR_ALL_MASK 0x00000FBE
59#define GQSPI_CFG_MODE_EN_MASK 0xC0000000
60#define GQSPI_CFG_GEN_FIFO_START_MODE_MASK 0x20000000
61#define GQSPI_CFG_ENDIAN_MASK 0x04000000
62#define GQSPI_CFG_EN_POLL_TO_MASK 0x00100000
63#define GQSPI_CFG_WP_HOLD_MASK 0x00080000
64#define GQSPI_CFG_BAUD_RATE_DIV_MASK 0x00000038
65#define GQSPI_CFG_CLK_PHA_MASK 0x00000004
66#define GQSPI_CFG_CLK_POL_MASK 0x00000002
67#define GQSPI_CFG_START_GEN_FIFO_MASK 0x10000000
68#define GQSPI_GENFIFO_IMM_DATA_MASK 0x000000FF
69#define GQSPI_GENFIFO_DATA_XFER 0x00000100
70#define GQSPI_GENFIFO_EXP 0x00000200
71#define GQSPI_GENFIFO_MODE_SPI 0x00000400
72#define GQSPI_GENFIFO_MODE_DUALSPI 0x00000800
73#define GQSPI_GENFIFO_MODE_QUADSPI 0x00000C00
74#define GQSPI_GENFIFO_MODE_MASK 0x00000C00
75#define GQSPI_GENFIFO_CS_LOWER 0x00001000
76#define GQSPI_GENFIFO_CS_UPPER 0x00002000
77#define GQSPI_GENFIFO_BUS_LOWER 0x00004000
78#define GQSPI_GENFIFO_BUS_UPPER 0x00008000
79#define GQSPI_GENFIFO_BUS_BOTH 0x0000C000
80#define GQSPI_GENFIFO_BUS_MASK 0x0000C000
81#define GQSPI_GENFIFO_TX 0x00010000
82#define GQSPI_GENFIFO_RX 0x00020000
83#define GQSPI_GENFIFO_STRIPE 0x00040000
84#define GQSPI_GENFIFO_POLL 0x00080000
85#define GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK 0x00000004
86#define GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK 0x00000002
87#define GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK 0x00000001
88#define GQSPI_ISR_RXEMPTY_MASK 0x00000800
89#define GQSPI_ISR_GENFIFOFULL_MASK 0x00000400
90#define GQSPI_ISR_GENFIFONOT_FULL_MASK 0x00000200
91#define GQSPI_ISR_TXEMPTY_MASK 0x00000100
92#define GQSPI_ISR_GENFIFOEMPTY_MASK 0x00000080
93#define GQSPI_ISR_RXFULL_MASK 0x00000020
94#define GQSPI_ISR_RXNEMPTY_MASK 0x00000010
95#define GQSPI_ISR_TXFULL_MASK 0x00000008
96#define GQSPI_ISR_TXNOT_FULL_MASK 0x00000004
97#define GQSPI_ISR_POLL_TIME_EXPIRE_MASK 0x00000002
98#define GQSPI_IER_TXNOT_FULL_MASK 0x00000004
99#define GQSPI_IER_RXEMPTY_MASK 0x00000800
100#define GQSPI_IER_POLL_TIME_EXPIRE_MASK 0x00000002
101#define GQSPI_IER_RXNEMPTY_MASK 0x00000010
102#define GQSPI_IER_GENFIFOEMPTY_MASK 0x00000080
103#define GQSPI_IER_TXEMPTY_MASK 0x00000100
104#define GQSPI_QSPIDMA_DST_INTR_ALL_MASK 0x000000FE
105#define GQSPI_QSPIDMA_DST_STS_WTC 0x0000E000
106#define GQSPI_CFG_MODE_EN_DMA_MASK 0x80000000
107#define GQSPI_ISR_IDR_MASK 0x00000994
108#define GQSPI_QSPIDMA_DST_I_EN_DONE_MASK 0x00000002
109#define GQSPI_QSPIDMA_DST_I_STS_DONE_MASK 0x00000002
110#define GQSPI_IRQ_MASK 0x00000980
111
112#define GQSPI_CFG_BAUD_RATE_DIV_SHIFT 3
113#define GQSPI_GENFIFO_CS_SETUP 0x4
114#define GQSPI_GENFIFO_CS_HOLD 0x3
115#define GQSPI_TXD_DEPTH 64
116#define GQSPI_RX_FIFO_THRESHOLD 32
117#define GQSPI_RX_FIFO_FILL (GQSPI_RX_FIFO_THRESHOLD * 4)
118#define GQSPI_TX_FIFO_THRESHOLD_RESET_VAL 32
119#define GQSPI_TX_FIFO_FILL (GQSPI_TXD_DEPTH -\
120 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL)
121#define GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL 0X10
122#define GQSPI_QSPIDMA_DST_CTRL_RESET_VAL 0x803FFA00
123#define GQSPI_SELECT_FLASH_CS_LOWER 0x1
124#define GQSPI_SELECT_FLASH_CS_UPPER 0x2
125#define GQSPI_SELECT_FLASH_CS_BOTH 0x3
126#define GQSPI_SELECT_FLASH_BUS_LOWER 0x1
127#define GQSPI_SELECT_FLASH_BUS_UPPER 0x2
128#define GQSPI_SELECT_FLASH_BUS_BOTH 0x3
129#define GQSPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */
130#define GQSPI_BAUD_DIV_SHIFT 2 /* Baud rate divisor shift */
131#define GQSPI_SELECT_MODE_SPI 0x1
132#define GQSPI_SELECT_MODE_DUALSPI 0x2
133#define GQSPI_SELECT_MODE_QUADSPI 0x4
134#define GQSPI_DMA_UNALIGN 0x3
135#define GQSPI_DEFAULT_NUM_CS 1 /* Default number of chip selects */
136
137#define GQSPI_MAX_NUM_CS 2 /* Maximum number of chip selects */
138
139#define GQSPI_USE_DATA_DLY 0x1
140#define GQSPI_USE_DATA_DLY_SHIFT 31
141#define GQSPI_DATA_DLY_ADJ_VALUE 0x2
142#define GQSPI_DATA_DLY_ADJ_SHIFT 28
143#define GQSPI_LPBK_DLY_ADJ_DLY_1 0x1
144#define GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT 0x3
145#define TAP_DLY_BYPASS_LQSPI_RX_VALUE 0x1
146#define TAP_DLY_BYPASS_LQSPI_RX_SHIFT 0x2
147
148/* set to differentiate versal from zynqmp, 1=versal, 0=zynqmp */
149#define QSPI_QUIRK_HAS_TAPDELAY BIT(0)
150
151#define GQSPI_FREQ_37_5MHZ 37500000
152#define GQSPI_FREQ_40MHZ 40000000
153#define GQSPI_FREQ_100MHZ 100000000
154#define GQSPI_FREQ_150MHZ 150000000
155
156#define SPI_AUTOSUSPEND_TIMEOUT 3000
157enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA};
158
159/**
160 * struct qspi_platform_data - zynqmp qspi platform data structure
161 * @quirks: Flags is used to identify the platform
162 */
163struct qspi_platform_data {
164 u32 quirks;
165};
166
167/**
168 * struct zynqmp_qspi - Defines qspi driver instance
169 * @ctlr: Pointer to the spi controller information
170 * @regs: Virtual address of the QSPI controller registers
171 * @refclk: Pointer to the peripheral clock
172 * @pclk: Pointer to the APB clock
173 * @irq: IRQ number
174 * @dev: Pointer to struct device
175 * @txbuf: Pointer to the TX buffer
176 * @rxbuf: Pointer to the RX buffer
177 * @bytes_to_transfer: Number of bytes left to transfer
178 * @bytes_to_receive: Number of bytes left to receive
179 * @genfifocs: Used for chip select
180 * @genfifobus: Used to select the upper or lower bus
181 * @dma_rx_bytes: Remaining bytes to receive by DMA mode
182 * @dma_addr: DMA address after mapping the kernel buffer
183 * @genfifoentry: Used for storing the genfifoentry instruction.
184 * @mode: Defines the mode in which QSPI is operating
185 * @data_completion: completion structure
186 * @op_lock: Operational lock
187 * @speed_hz: Current SPI bus clock speed in hz
188 * @has_tapdelay: Used for tapdelay register available in qspi
189 */
190struct zynqmp_qspi {
191 struct spi_controller *ctlr;
192 void __iomem *regs;
193 struct clk *refclk;
194 struct clk *pclk;
195 int irq;
196 struct device *dev;
197 const void *txbuf;
198 void *rxbuf;
199 int bytes_to_transfer;
200 int bytes_to_receive;
201 u32 genfifocs;
202 u32 genfifobus;
203 u32 dma_rx_bytes;
204 dma_addr_t dma_addr;
205 u32 genfifoentry;
206 enum mode_type mode;
207 struct completion data_completion;
208 struct mutex op_lock;
209 u32 speed_hz;
210 bool has_tapdelay;
211};
212
213/**
214 * zynqmp_gqspi_read - For GQSPI controller read operation
215 * @xqspi: Pointer to the zynqmp_qspi structure
216 * @offset: Offset from where to read
217 * Return: Value at the offset
218 */
219static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset)
220{
221 return readl_relaxed(xqspi->regs + offset);
222}
223
224/**
225 * zynqmp_gqspi_write - For GQSPI controller write operation
226 * @xqspi: Pointer to the zynqmp_qspi structure
227 * @offset: Offset where to write
228 * @val: Value to be written
229 */
230static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset,
231 u32 val)
232{
233 writel_relaxed(val, (xqspi->regs + offset));
234}
235
236/**
237 * zynqmp_gqspi_selecttarget - For selection of target device
238 * @instanceptr: Pointer to the zynqmp_qspi structure
239 * @targetcs: For chip select
240 * @targetbus: To check which bus is selected- upper or lower
241 */
242static void zynqmp_gqspi_selecttarget(struct zynqmp_qspi *instanceptr,
243 u8 targetcs, u8 targetbus)
244{
245 /*
246 * Bus and CS lines selected here will be updated in the instance and
247 * used for subsequent GENFIFO entries during transfer.
248 */
249
250 /* Choose target select line */
251 switch (targetcs) {
252 case GQSPI_SELECT_FLASH_CS_BOTH:
253 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER |
254 GQSPI_GENFIFO_CS_UPPER;
255 break;
256 case GQSPI_SELECT_FLASH_CS_UPPER:
257 instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER;
258 break;
259 case GQSPI_SELECT_FLASH_CS_LOWER:
260 instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER;
261 break;
262 default:
263 dev_warn(instanceptr->dev, "Invalid target select\n");
264 }
265
266 /* Choose the bus */
267 switch (targetbus) {
268 case GQSPI_SELECT_FLASH_BUS_BOTH:
269 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER |
270 GQSPI_GENFIFO_BUS_UPPER;
271 break;
272 case GQSPI_SELECT_FLASH_BUS_UPPER:
273 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
274 break;
275 case GQSPI_SELECT_FLASH_BUS_LOWER:
276 instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
277 break;
278 default:
279 dev_warn(instanceptr->dev, "Invalid target bus\n");
280 }
281}
282
283/**
284 * zynqmp_qspi_set_tapdelay: To configure qspi tap delays
285 * @xqspi: Pointer to the zynqmp_qspi structure
286 * @baudrateval: Buadrate to configure
287 */
288static void zynqmp_qspi_set_tapdelay(struct zynqmp_qspi *xqspi, u32 baudrateval)
289{
290 u32 tapdlybypass = 0, lpbkdlyadj = 0, datadlyadj = 0, clk_rate;
291 u32 reqhz = 0;
292
293 clk_rate = clk_get_rate(xqspi->refclk);
294 reqhz = (clk_rate / (GQSPI_BAUD_DIV_SHIFT << baudrateval));
295
296 if (!xqspi->has_tapdelay) {
297 if (reqhz <= GQSPI_FREQ_40MHZ) {
298 zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
299 PM_TAPDELAY_BYPASS_ENABLE);
300 } else if (reqhz <= GQSPI_FREQ_100MHZ) {
301 zynqmp_pm_set_tapdelay_bypass(PM_TAPDELAY_QSPI,
302 PM_TAPDELAY_BYPASS_ENABLE);
303 lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
304 datadlyadj |= ((GQSPI_USE_DATA_DLY <<
305 GQSPI_USE_DATA_DLY_SHIFT)
306 | (GQSPI_DATA_DLY_ADJ_VALUE <<
307 GQSPI_DATA_DLY_ADJ_SHIFT));
308 } else if (reqhz <= GQSPI_FREQ_150MHZ) {
309 lpbkdlyadj |= GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK;
310 }
311 } else {
312 if (reqhz <= GQSPI_FREQ_37_5MHZ) {
313 tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
314 TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
315 } else if (reqhz <= GQSPI_FREQ_100MHZ) {
316 tapdlybypass |= (TAP_DLY_BYPASS_LQSPI_RX_VALUE <<
317 TAP_DLY_BYPASS_LQSPI_RX_SHIFT);
318 lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK);
319 datadlyadj |= (GQSPI_USE_DATA_DLY <<
320 GQSPI_USE_DATA_DLY_SHIFT);
321 } else if (reqhz <= GQSPI_FREQ_150MHZ) {
322 lpbkdlyadj |= (GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK
323 | (GQSPI_LPBK_DLY_ADJ_DLY_1 <<
324 GQSPI_LPBK_DLY_ADJ_DLY_1_SHIFT));
325 }
326 zynqmp_gqspi_write(xqspi,
327 IOU_TAPDLY_BYPASS_OFST, tapdlybypass);
328 }
329 zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, lpbkdlyadj);
330 zynqmp_gqspi_write(xqspi, GQSPI_DATA_DLY_ADJ_OFST, datadlyadj);
331}
332
333/**
334 * zynqmp_qspi_init_hw - Initialize the hardware
335 * @xqspi: Pointer to the zynqmp_qspi structure
336 *
337 * The default settings of the QSPI controller's configurable parameters on
338 * reset are
339 * - Host mode
340 * - TX threshold set to 1
341 * - RX threshold set to 1
342 * - Flash memory interface mode enabled
343 * This function performs the following actions
344 * - Disable and clear all the interrupts
345 * - Enable manual target select
346 * - Enable manual start
347 * - Deselect all the chip select lines
348 * - Set the little endian mode of TX FIFO
349 * - Set clock phase
350 * - Set clock polarity and
351 * - Enable the QSPI controller
352 */
353static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi)
354{
355 u32 config_reg, baud_rate_val = 0;
356 ulong clk_rate;
357
358 /* Select the GQSPI mode */
359 zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK);
360 /* Clear and disable interrupts */
361 zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST,
362 zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) |
363 GQSPI_ISR_WR_TO_CLR_MASK);
364 /* Clear the DMA STS */
365 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
366 zynqmp_gqspi_read(xqspi,
367 GQSPI_QSPIDMA_DST_I_STS_OFST));
368 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST,
369 zynqmp_gqspi_read(xqspi,
370 GQSPI_QSPIDMA_DST_STS_OFST) |
371 GQSPI_QSPIDMA_DST_STS_WTC);
372 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK);
373 zynqmp_gqspi_write(xqspi,
374 GQSPI_QSPIDMA_DST_I_DIS_OFST,
375 GQSPI_QSPIDMA_DST_INTR_ALL_MASK);
376 /* Disable the GQSPI */
377 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
378 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
379 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
380 /* Manual start */
381 config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK;
382 /* Little endian by default */
383 config_reg &= ~GQSPI_CFG_ENDIAN_MASK;
384 /* Disable poll time out */
385 config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK;
386 /* Set hold bit */
387 config_reg |= GQSPI_CFG_WP_HOLD_MASK;
388 /* Clear pre-scalar by default */
389 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
390 /* Set CPHA */
391 if (xqspi->ctlr->mode_bits & SPI_CPHA)
392 config_reg |= GQSPI_CFG_CLK_PHA_MASK;
393 else
394 config_reg &= ~GQSPI_CFG_CLK_PHA_MASK;
395 /* Set CPOL */
396 if (xqspi->ctlr->mode_bits & SPI_CPOL)
397 config_reg |= GQSPI_CFG_CLK_POL_MASK;
398 else
399 config_reg &= ~GQSPI_CFG_CLK_POL_MASK;
400
401 /* Set the clock frequency */
402 clk_rate = clk_get_rate(xqspi->refclk);
403 while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
404 (clk_rate /
405 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > xqspi->speed_hz)
406 baud_rate_val++;
407
408 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
409 config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
410
411 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
412
413 /* Set the tapdelay for clock frequency */
414 zynqmp_qspi_set_tapdelay(xqspi, baud_rate_val);
415
416 /* Clear the TX and RX FIFO */
417 zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST,
418 GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK |
419 GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK |
420 GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK);
421 /* Reset thresholds */
422 zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST,
423 GQSPI_TX_FIFO_THRESHOLD_RESET_VAL);
424 zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST,
425 GQSPI_RX_FIFO_THRESHOLD);
426 zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST,
427 GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL);
428 zynqmp_gqspi_selecttarget(xqspi,
429 GQSPI_SELECT_FLASH_CS_LOWER,
430 GQSPI_SELECT_FLASH_BUS_LOWER);
431 /* Initialize DMA */
432 zynqmp_gqspi_write(xqspi,
433 GQSPI_QSPIDMA_DST_CTRL_OFST,
434 GQSPI_QSPIDMA_DST_CTRL_RESET_VAL);
435
436 /* Enable the GQSPI */
437 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
438}
439
440/**
441 * zynqmp_qspi_copy_read_data - Copy data to RX buffer
442 * @xqspi: Pointer to the zynqmp_qspi structure
443 * @data: The variable where data is stored
444 * @size: Number of bytes to be copied from data to RX buffer
445 */
446static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi,
447 ulong data, u8 size)
448{
449 memcpy(xqspi->rxbuf, &data, size);
450 xqspi->rxbuf += size;
451 xqspi->bytes_to_receive -= size;
452}
453
454/**
455 * zynqmp_qspi_chipselect - Select or deselect the chip select line
456 * @qspi: Pointer to the spi_device structure
457 * @is_high: Select(0) or deselect (1) the chip select line
458 */
459static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high)
460{
461 struct zynqmp_qspi *xqspi = spi_controller_get_devdata(qspi->controller);
462 ulong timeout;
463 u32 genfifoentry = 0, statusreg;
464
465 genfifoentry |= GQSPI_GENFIFO_MODE_SPI;
466
467 if (!is_high) {
468 if (!spi_get_chipselect(qspi, 0)) {
469 xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER;
470 xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER;
471 } else {
472 xqspi->genfifobus = GQSPI_GENFIFO_BUS_UPPER;
473 xqspi->genfifocs = GQSPI_GENFIFO_CS_UPPER;
474 }
475 genfifoentry |= xqspi->genfifobus;
476 genfifoentry |= xqspi->genfifocs;
477 genfifoentry |= GQSPI_GENFIFO_CS_SETUP;
478 } else {
479 genfifoentry |= GQSPI_GENFIFO_CS_HOLD;
480 }
481
482 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
483
484 /* Manually start the generic FIFO command */
485 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
486 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
487 GQSPI_CFG_START_GEN_FIFO_MASK);
488
489 timeout = jiffies + msecs_to_jiffies(1000);
490
491 /* Wait until the generic FIFO command is empty */
492 do {
493 statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
494
495 if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) &&
496 (statusreg & GQSPI_ISR_TXEMPTY_MASK))
497 break;
498 cpu_relax();
499 } while (!time_after_eq(jiffies, timeout));
500
501 if (time_after_eq(jiffies, timeout))
502 dev_err(xqspi->dev, "Chip select timed out\n");
503}
504
505/**
506 * zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4.
507 * @xqspi: xqspi is a pointer to the GQSPI instance
508 * @spimode: spimode - SPI or DUAL or QUAD.
509 * Return: Mask to set desired SPI mode in GENFIFO entry.
510 */
511static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi,
512 u8 spimode)
513{
514 u32 mask = 0;
515
516 switch (spimode) {
517 case GQSPI_SELECT_MODE_DUALSPI:
518 mask = GQSPI_GENFIFO_MODE_DUALSPI;
519 break;
520 case GQSPI_SELECT_MODE_QUADSPI:
521 mask = GQSPI_GENFIFO_MODE_QUADSPI;
522 break;
523 case GQSPI_SELECT_MODE_SPI:
524 mask = GQSPI_GENFIFO_MODE_SPI;
525 break;
526 default:
527 dev_warn(xqspi->dev, "Invalid SPI mode\n");
528 }
529
530 return mask;
531}
532
533/**
534 * zynqmp_qspi_config_op - Configure QSPI controller for specified
535 * transfer
536 * @xqspi: Pointer to the zynqmp_qspi structure
537 * @op: The memory operation to execute
538 *
539 * Sets the operational mode of QSPI controller for the next QSPI transfer and
540 * sets the requested clock frequency.
541 *
542 * Return: Always 0
543 *
544 * Note:
545 * If the requested frequency is not an exact match with what can be
546 * obtained using the pre-scalar value, the driver sets the clock
547 * frequency which is lower than the requested frequency (maximum lower)
548 * for the transfer.
549 *
550 * If the requested frequency is higher or lower than that is supported
551 * by the QSPI controller the driver will set the highest or lowest
552 * frequency supported by controller.
553 */
554static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi,
555 const struct spi_mem_op *op)
556{
557 ulong clk_rate;
558 u32 config_reg, req_speed_hz, baud_rate_val = 0;
559
560 req_speed_hz = op->max_freq;
561
562 if (xqspi->speed_hz != req_speed_hz) {
563 xqspi->speed_hz = req_speed_hz;
564
565 /* Set the clock frequency */
566 /* If req_speed_hz == 0, default to lowest speed */
567 clk_rate = clk_get_rate(xqspi->refclk);
568
569 while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) &&
570 (clk_rate /
571 (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) >
572 req_speed_hz)
573 baud_rate_val++;
574
575 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
576
577 config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK;
578 config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT);
579 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
580 zynqmp_qspi_set_tapdelay(xqspi, baud_rate_val);
581 }
582
583 dev_dbg(xqspi->dev, "config speed %u\n", req_speed_hz);
584 return 0;
585}
586
587/**
588 * zynqmp_qspi_setup_op - Configure the QSPI controller
589 * @qspi: Pointer to the spi_device structure
590 *
591 * Sets the operational mode of QSPI controller for the next QSPI transfer,
592 * baud rate and divisor value to setup the requested qspi clock.
593 *
594 * Return: 0 on success; error value otherwise.
595 */
596static int zynqmp_qspi_setup_op(struct spi_device *qspi)
597{
598 struct spi_controller *ctlr = qspi->controller;
599 struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr);
600
601 if (ctlr->busy)
602 return -EBUSY;
603
604 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
605
606 return 0;
607}
608
609/**
610 * zynqmp_qspi_filltxfifo - Fills the TX FIFO as long as there is room in
611 * the FIFO or the bytes required to be
612 * transmitted.
613 * @xqspi: Pointer to the zynqmp_qspi structure
614 * @size: Number of bytes to be copied from TX buffer to TX FIFO
615 */
616static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size)
617{
618 u32 count = 0, intermediate;
619
620 while ((xqspi->bytes_to_transfer > 0) && (count < size) && (xqspi->txbuf)) {
621 if (xqspi->bytes_to_transfer >= 4) {
622 memcpy(&intermediate, xqspi->txbuf, 4);
623 xqspi->txbuf += 4;
624 xqspi->bytes_to_transfer -= 4;
625 count += 4;
626 } else {
627 memcpy(&intermediate, xqspi->txbuf,
628 xqspi->bytes_to_transfer);
629 xqspi->txbuf += xqspi->bytes_to_transfer;
630 xqspi->bytes_to_transfer = 0;
631 count += xqspi->bytes_to_transfer;
632 }
633 zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate);
634 }
635}
636
637/**
638 * zynqmp_qspi_readrxfifo - Fills the RX FIFO as long as there is room in
639 * the FIFO.
640 * @xqspi: Pointer to the zynqmp_qspi structure
641 * @size: Number of bytes to be copied from RX buffer to RX FIFO
642 */
643static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size)
644{
645 ulong data;
646 int count = 0;
647
648 while ((count < size) && (xqspi->bytes_to_receive > 0)) {
649 if (xqspi->bytes_to_receive >= 4) {
650 (*(u32 *)xqspi->rxbuf) =
651 zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
652 xqspi->rxbuf += 4;
653 xqspi->bytes_to_receive -= 4;
654 count += 4;
655 } else {
656 data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST);
657 count += xqspi->bytes_to_receive;
658 zynqmp_qspi_copy_read_data(xqspi, data,
659 xqspi->bytes_to_receive);
660 xqspi->bytes_to_receive = 0;
661 }
662 }
663}
664
665/**
666 * zynqmp_qspi_fillgenfifo - Fills the GENFIFO.
667 * @xqspi: Pointer to the zynqmp_qspi structure
668 * @nbits: Transfer/Receive buswidth.
669 * @genfifoentry: Variable in which GENFIFO mask is saved
670 */
671static void zynqmp_qspi_fillgenfifo(struct zynqmp_qspi *xqspi, u8 nbits,
672 u32 genfifoentry)
673{
674 u32 transfer_len, tempcount, exponent;
675 u8 imm_data;
676
677 genfifoentry |= GQSPI_GENFIFO_DATA_XFER;
678 if (xqspi->rxbuf) {
679 genfifoentry |= GQSPI_GENFIFO_RX;
680 if (xqspi->mode == GQSPI_MODE_DMA)
681 transfer_len = xqspi->dma_rx_bytes;
682 else
683 transfer_len = xqspi->bytes_to_receive;
684 } else {
685 transfer_len = xqspi->bytes_to_transfer;
686 }
687
688 if (xqspi->txbuf)
689 genfifoentry |= GQSPI_GENFIFO_TX;
690
691 genfifoentry |= zynqmp_qspi_selectspimode(xqspi, nbits);
692 xqspi->genfifoentry = genfifoentry;
693 dev_dbg(xqspi->dev, "genfifo %05x transfer_len %u\n",
694 genfifoentry, transfer_len);
695
696 /* Exponent entries */
697 imm_data = transfer_len;
698 tempcount = transfer_len >> 8;
699 exponent = 8;
700 genfifoentry |= GQSPI_GENFIFO_EXP;
701 while (tempcount) {
702 if (tempcount & 1)
703 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST,
704 genfifoentry | exponent);
705 tempcount >>= 1;
706 exponent++;
707 }
708
709 /* Immediate entry */
710 genfifoentry &= ~GQSPI_GENFIFO_EXP;
711 if (imm_data)
712 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST,
713 genfifoentry | imm_data);
714
715 /* Dummy generic FIFO entry */
716 if (xqspi->mode == GQSPI_MODE_IO && xqspi->rxbuf)
717 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0);
718}
719
720/**
721 * zynqmp_qspi_disable_dma() - Disable DMA mode
722 * @xqspi: GQSPI instance
723 */
724static void zynqmp_qspi_disable_dma(struct zynqmp_qspi *xqspi)
725{
726 u32 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
727
728 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
729 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
730 xqspi->mode = GQSPI_MODE_IO;
731}
732
733/**
734 * zynqmp_qspi_enable_dma() - Enable DMA mode
735 * @xqspi: GQSPI instance
736 */
737static void zynqmp_qspi_enable_dma(struct zynqmp_qspi *xqspi)
738{
739 u32 config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST);
740
741 config_reg &= ~GQSPI_CFG_MODE_EN_MASK;
742 config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK;
743 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg);
744 xqspi->mode = GQSPI_MODE_DMA;
745}
746
747/**
748 * zynqmp_process_dma_irq - Handler for DMA done interrupt of QSPI
749 * controller
750 * @xqspi: zynqmp_qspi instance pointer
751 *
752 * This function handles DMA interrupt only.
753 */
754static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi)
755{
756 u32 genfifoentry;
757
758 dma_unmap_single(xqspi->dev, xqspi->dma_addr,
759 xqspi->dma_rx_bytes, DMA_FROM_DEVICE);
760 xqspi->rxbuf += xqspi->dma_rx_bytes;
761 xqspi->bytes_to_receive -= xqspi->dma_rx_bytes;
762 xqspi->dma_rx_bytes = 0;
763
764 /* Disabling the DMA interrupts */
765 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST,
766 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
767
768 if (xqspi->bytes_to_receive > 0) {
769 /* Switch to IO mode,for remaining bytes to receive */
770 zynqmp_qspi_disable_dma(xqspi);
771
772 /* Initiate the transfer of remaining bytes */
773 genfifoentry = xqspi->genfifoentry;
774 genfifoentry |= xqspi->bytes_to_receive;
775 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry);
776
777 /* Dummy generic FIFO entry */
778 zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0);
779
780 /* Manual start */
781 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
782 (zynqmp_gqspi_read(xqspi,
783 GQSPI_CONFIG_OFST) |
784 GQSPI_CFG_START_GEN_FIFO_MASK));
785
786 /* Enable the RX interrupts for IO mode */
787 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
788 GQSPI_IER_GENFIFOEMPTY_MASK |
789 GQSPI_IER_RXNEMPTY_MASK |
790 GQSPI_IER_RXEMPTY_MASK);
791 }
792}
793
794/**
795 * zynqmp_qspi_irq - Interrupt service routine of the QSPI controller
796 * @irq: IRQ number
797 * @dev_id: Pointer to the xqspi structure
798 *
799 * This function handles TX empty only.
800 * On TX empty interrupt this function reads the received data from RX FIFO
801 * and fills the TX FIFO if there is any data remaining to be transferred.
802 *
803 * Return: IRQ_HANDLED when interrupt is handled
804 * IRQ_NONE otherwise.
805 */
806static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id)
807{
808 struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id;
809 u32 status, mask, dma_status = 0;
810
811 status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST);
812 zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status);
813 mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST)));
814
815 /* Read and clear DMA status */
816 if (xqspi->mode == GQSPI_MODE_DMA) {
817 dma_status =
818 zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST);
819 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST,
820 dma_status);
821 }
822
823 if (!mask && !dma_status)
824 return IRQ_NONE;
825
826 if (mask & GQSPI_ISR_TXNOT_FULL_MASK)
827 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL);
828
829 if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK)
830 zynqmp_process_dma_irq(xqspi);
831 else if (!(mask & GQSPI_IER_RXEMPTY_MASK) &&
832 (mask & GQSPI_IER_GENFIFOEMPTY_MASK))
833 zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL);
834
835 if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 &&
836 ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) {
837 zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK);
838 complete(&xqspi->data_completion);
839 }
840 return IRQ_HANDLED;
841}
842
843/**
844 * zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation
845 * @xqspi: xqspi is a pointer to the GQSPI instance.
846 *
847 * Return: 0 on success; error value otherwise.
848 */
849static int zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi)
850{
851 u32 rx_bytes, rx_rem;
852 dma_addr_t addr;
853 u64 dma_align = (u64)(uintptr_t)xqspi->rxbuf;
854
855 if (xqspi->bytes_to_receive < 8 ||
856 ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) {
857 /* Setting to IO mode */
858 zynqmp_qspi_disable_dma(xqspi);
859 xqspi->dma_rx_bytes = 0;
860 return 0;
861 }
862
863 rx_rem = xqspi->bytes_to_receive % 4;
864 rx_bytes = (xqspi->bytes_to_receive - rx_rem);
865
866 addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf,
867 rx_bytes, DMA_FROM_DEVICE);
868 if (dma_mapping_error(xqspi->dev, addr)) {
869 dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n");
870 return -ENOMEM;
871 }
872
873 xqspi->dma_rx_bytes = rx_bytes;
874 xqspi->dma_addr = addr;
875 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST,
876 (u32)(addr & 0xffffffff));
877 addr = ((addr >> 16) >> 16);
878 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST,
879 ((u32)addr) & 0xfff);
880
881 zynqmp_qspi_enable_dma(xqspi);
882
883 /* Write the number of bytes to transfer */
884 zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes);
885
886 return 0;
887}
888
889/**
890 * zynqmp_qspi_write_op - This function sets up the GENFIFO entries,
891 * TX FIFO, and fills the TX FIFO with as many
892 * bytes as possible.
893 * @xqspi: Pointer to the GQSPI instance.
894 * @tx_nbits: Transfer buswidth.
895 * @genfifoentry: Variable in which GENFIFO mask is returned
896 * to calling function
897 */
898static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits,
899 u32 genfifoentry)
900{
901 zynqmp_qspi_fillgenfifo(xqspi, tx_nbits, genfifoentry);
902 zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH);
903 if (xqspi->mode == GQSPI_MODE_DMA)
904 zynqmp_qspi_disable_dma(xqspi);
905}
906
907/**
908 * zynqmp_qspi_read_op - This function sets up the GENFIFO entries and
909 * RX DMA operation.
910 * @xqspi: xqspi is a pointer to the GQSPI instance.
911 * @rx_nbits: Receive buswidth.
912 * @genfifoentry: genfifoentry is pointer to the variable in which
913 * GENFIFO mask is returned to calling function
914 *
915 * Return: 0 on success; error value otherwise.
916 */
917static int zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits,
918 u32 genfifoentry)
919{
920 int ret;
921
922 ret = zynqmp_qspi_setuprxdma(xqspi);
923 if (ret)
924 return ret;
925 zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry);
926
927 return 0;
928}
929
930/**
931 * zynqmp_qspi_suspend - Suspend method for the QSPI driver
932 * @dev: Address of the platform_device structure
933 *
934 * This function stops the QSPI driver queue and disables the QSPI controller
935 *
936 * Return: Always 0
937 */
938static int __maybe_unused zynqmp_qspi_suspend(struct device *dev)
939{
940 struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
941 struct spi_controller *ctlr = xqspi->ctlr;
942 int ret;
943
944 ret = spi_controller_suspend(ctlr);
945 if (ret)
946 return ret;
947
948 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
949
950 return 0;
951}
952
953/**
954 * zynqmp_qspi_resume - Resume method for the QSPI driver
955 * @dev: Address of the platform_device structure
956 *
957 * The function starts the QSPI driver queue and initializes the QSPI
958 * controller
959 *
960 * Return: 0 on success; error value otherwise
961 */
962static int __maybe_unused zynqmp_qspi_resume(struct device *dev)
963{
964 struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
965 struct spi_controller *ctlr = xqspi->ctlr;
966
967 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK);
968
969 spi_controller_resume(ctlr);
970
971 return 0;
972}
973
974/**
975 * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver
976 * @dev: Address of the platform_device structure
977 *
978 * This function disables the clocks
979 *
980 * Return: Always 0
981 */
982static int __maybe_unused zynqmp_runtime_suspend(struct device *dev)
983{
984 struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
985
986 clk_disable_unprepare(xqspi->refclk);
987 clk_disable_unprepare(xqspi->pclk);
988
989 return 0;
990}
991
992/**
993 * zynqmp_runtime_resume - Runtime resume method for the SPI driver
994 * @dev: Address of the platform_device structure
995 *
996 * This function enables the clocks
997 *
998 * Return: 0 on success and error value on error
999 */
1000static int __maybe_unused zynqmp_runtime_resume(struct device *dev)
1001{
1002 struct zynqmp_qspi *xqspi = dev_get_drvdata(dev);
1003 int ret;
1004
1005 ret = clk_prepare_enable(xqspi->pclk);
1006 if (ret) {
1007 dev_err(dev, "Cannot enable APB clock.\n");
1008 return ret;
1009 }
1010
1011 ret = clk_prepare_enable(xqspi->refclk);
1012 if (ret) {
1013 dev_err(dev, "Cannot enable device clock.\n");
1014 clk_disable_unprepare(xqspi->pclk);
1015 return ret;
1016 }
1017
1018 return 0;
1019}
1020
1021static unsigned long zynqmp_qspi_timeout(struct zynqmp_qspi *xqspi, u8 bits,
1022 unsigned long bytes)
1023{
1024 unsigned long timeout;
1025
1026 /* Assume we are at most 2x slower than the nominal bus speed */
1027 timeout = mult_frac(bytes, 2 * 8 * MSEC_PER_SEC,
1028 bits * xqspi->speed_hz);
1029 /* And add 100 ms for scheduling delays */
1030 return msecs_to_jiffies(timeout + 100);
1031}
1032
1033/**
1034 * zynqmp_qspi_exec_op() - Initiates the QSPI transfer
1035 * @mem: The SPI memory
1036 * @op: The memory operation to execute
1037 *
1038 * Executes a memory operation.
1039 *
1040 * This function first selects the chip and starts the memory operation.
1041 *
1042 * Return: 0 in case of success, a negative error code otherwise.
1043 */
1044static int zynqmp_qspi_exec_op(struct spi_mem *mem,
1045 const struct spi_mem_op *op)
1046{
1047 struct zynqmp_qspi *xqspi =
1048 spi_controller_get_devdata(mem->spi->controller);
1049 unsigned long timeout;
1050 int err = 0, i;
1051 u32 genfifoentry = 0;
1052 u16 opcode = op->cmd.opcode;
1053 u64 opaddr;
1054
1055 mutex_lock(&xqspi->op_lock);
1056 zynqmp_qspi_config_op(xqspi, op);
1057 zynqmp_qspi_chipselect(mem->spi, false);
1058 genfifoentry |= xqspi->genfifocs;
1059 genfifoentry |= xqspi->genfifobus;
1060
1061 if (op->cmd.opcode) {
1062 reinit_completion(&xqspi->data_completion);
1063 xqspi->txbuf = &opcode;
1064 xqspi->rxbuf = NULL;
1065 xqspi->bytes_to_transfer = op->cmd.nbytes;
1066 xqspi->bytes_to_receive = 0;
1067 zynqmp_qspi_write_op(xqspi, op->cmd.buswidth, genfifoentry);
1068 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1069 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
1070 GQSPI_CFG_START_GEN_FIFO_MASK);
1071 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1072 GQSPI_IER_GENFIFOEMPTY_MASK |
1073 GQSPI_IER_TXNOT_FULL_MASK);
1074 timeout = zynqmp_qspi_timeout(xqspi, op->cmd.buswidth,
1075 op->cmd.nbytes);
1076 if (!wait_for_completion_timeout(&xqspi->data_completion,
1077 timeout)) {
1078 err = -ETIMEDOUT;
1079 goto return_err;
1080 }
1081 }
1082
1083 if (op->addr.nbytes) {
1084 xqspi->txbuf = &opaddr;
1085 for (i = 0; i < op->addr.nbytes; i++) {
1086 *(((u8 *)xqspi->txbuf) + i) = op->addr.val >>
1087 (8 * (op->addr.nbytes - i - 1));
1088 }
1089
1090 reinit_completion(&xqspi->data_completion);
1091 xqspi->rxbuf = NULL;
1092 xqspi->bytes_to_transfer = op->addr.nbytes;
1093 xqspi->bytes_to_receive = 0;
1094 zynqmp_qspi_write_op(xqspi, op->addr.buswidth, genfifoentry);
1095 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1096 zynqmp_gqspi_read(xqspi,
1097 GQSPI_CONFIG_OFST) |
1098 GQSPI_CFG_START_GEN_FIFO_MASK);
1099 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1100 GQSPI_IER_TXEMPTY_MASK |
1101 GQSPI_IER_GENFIFOEMPTY_MASK |
1102 GQSPI_IER_TXNOT_FULL_MASK);
1103 timeout = zynqmp_qspi_timeout(xqspi, op->addr.buswidth,
1104 op->addr.nbytes);
1105 if (!wait_for_completion_timeout(&xqspi->data_completion,
1106 timeout)) {
1107 err = -ETIMEDOUT;
1108 goto return_err;
1109 }
1110 }
1111
1112 if (op->dummy.nbytes) {
1113 xqspi->txbuf = NULL;
1114 xqspi->rxbuf = NULL;
1115 /*
1116 * xqspi->bytes_to_transfer here represents the dummy circles
1117 * which need to be sent.
1118 */
1119 xqspi->bytes_to_transfer = op->dummy.nbytes * 8 / op->dummy.buswidth;
1120 xqspi->bytes_to_receive = 0;
1121 /*
1122 * Using op->data.buswidth instead of op->dummy.buswidth here because
1123 * we need to use it to configure the correct SPI mode.
1124 */
1125 zynqmp_qspi_write_op(xqspi, op->data.buswidth,
1126 genfifoentry);
1127 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1128 zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) |
1129 GQSPI_CFG_START_GEN_FIFO_MASK);
1130 }
1131
1132 if (op->data.nbytes) {
1133 reinit_completion(&xqspi->data_completion);
1134 if (op->data.dir == SPI_MEM_DATA_OUT) {
1135 xqspi->txbuf = (u8 *)op->data.buf.out;
1136 xqspi->rxbuf = NULL;
1137 xqspi->bytes_to_transfer = op->data.nbytes;
1138 xqspi->bytes_to_receive = 0;
1139 zynqmp_qspi_write_op(xqspi, op->data.buswidth,
1140 genfifoentry);
1141 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1142 zynqmp_gqspi_read
1143 (xqspi, GQSPI_CONFIG_OFST) |
1144 GQSPI_CFG_START_GEN_FIFO_MASK);
1145 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1146 GQSPI_IER_TXEMPTY_MASK |
1147 GQSPI_IER_GENFIFOEMPTY_MASK |
1148 GQSPI_IER_TXNOT_FULL_MASK);
1149 } else {
1150 xqspi->txbuf = NULL;
1151 xqspi->rxbuf = (u8 *)op->data.buf.in;
1152 xqspi->bytes_to_receive = op->data.nbytes;
1153 xqspi->bytes_to_transfer = 0;
1154 err = zynqmp_qspi_read_op(xqspi, op->data.buswidth,
1155 genfifoentry);
1156 if (err)
1157 goto return_err;
1158
1159 zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST,
1160 zynqmp_gqspi_read
1161 (xqspi, GQSPI_CONFIG_OFST) |
1162 GQSPI_CFG_START_GEN_FIFO_MASK);
1163 if (xqspi->mode == GQSPI_MODE_DMA) {
1164 zynqmp_gqspi_write
1165 (xqspi, GQSPI_QSPIDMA_DST_I_EN_OFST,
1166 GQSPI_QSPIDMA_DST_I_EN_DONE_MASK);
1167 } else {
1168 zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST,
1169 GQSPI_IER_GENFIFOEMPTY_MASK |
1170 GQSPI_IER_RXNEMPTY_MASK |
1171 GQSPI_IER_RXEMPTY_MASK);
1172 }
1173 }
1174 timeout = zynqmp_qspi_timeout(xqspi, op->data.buswidth,
1175 op->data.nbytes);
1176 if (!wait_for_completion_timeout(&xqspi->data_completion, timeout))
1177 err = -ETIMEDOUT;
1178 }
1179
1180return_err:
1181
1182 zynqmp_qspi_chipselect(mem->spi, true);
1183 mutex_unlock(&xqspi->op_lock);
1184
1185 return err;
1186}
1187
1188static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = {
1189 SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend,
1190 zynqmp_runtime_resume, NULL)
1191 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume)
1192};
1193
1194static const struct qspi_platform_data versal_qspi_def = {
1195 .quirks = QSPI_QUIRK_HAS_TAPDELAY,
1196};
1197
1198static const struct of_device_id zynqmp_qspi_of_match[] = {
1199 { .compatible = "xlnx,zynqmp-qspi-1.0"},
1200 { .compatible = "xlnx,versal-qspi-1.0", .data = &versal_qspi_def },
1201 { /* End of table */ }
1202};
1203
1204static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = {
1205 .exec_op = zynqmp_qspi_exec_op,
1206};
1207
1208static const struct spi_controller_mem_caps zynqmp_qspi_mem_caps = {
1209 .per_op_freq = true,
1210};
1211
1212/**
1213 * zynqmp_qspi_probe - Probe method for the QSPI driver
1214 * @pdev: Pointer to the platform_device structure
1215 *
1216 * This function initializes the driver data structures and the hardware.
1217 *
1218 * Return: 0 on success; error value otherwise
1219 */
1220static int zynqmp_qspi_probe(struct platform_device *pdev)
1221{
1222 int ret = 0;
1223 struct spi_controller *ctlr;
1224 struct zynqmp_qspi *xqspi;
1225 struct device *dev = &pdev->dev;
1226 struct device_node *np = dev->of_node;
1227 u32 num_cs;
1228 const struct qspi_platform_data *p_data;
1229
1230 ctlr = devm_spi_alloc_host(&pdev->dev, sizeof(*xqspi));
1231 if (!ctlr)
1232 return -ENOMEM;
1233
1234 xqspi = spi_controller_get_devdata(ctlr);
1235 xqspi->dev = dev;
1236 xqspi->ctlr = ctlr;
1237 platform_set_drvdata(pdev, xqspi);
1238
1239 p_data = of_device_get_match_data(&pdev->dev);
1240 if (p_data && (p_data->quirks & QSPI_QUIRK_HAS_TAPDELAY))
1241 xqspi->has_tapdelay = true;
1242
1243 xqspi->regs = devm_platform_ioremap_resource(pdev, 0);
1244 if (IS_ERR(xqspi->regs))
1245 return PTR_ERR(xqspi->regs);
1246
1247 xqspi->pclk = devm_clk_get(&pdev->dev, "pclk");
1248 if (IS_ERR(xqspi->pclk))
1249 return dev_err_probe(dev, PTR_ERR(xqspi->pclk),
1250 "pclk clock not found.\n");
1251
1252 xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk");
1253 if (IS_ERR(xqspi->refclk))
1254 return dev_err_probe(dev, PTR_ERR(xqspi->refclk),
1255 "ref_clk clock not found.\n");
1256
1257 ret = clk_prepare_enable(xqspi->pclk);
1258 if (ret)
1259 return dev_err_probe(dev, ret, "Unable to enable APB clock.\n");
1260
1261 ret = clk_prepare_enable(xqspi->refclk);
1262 if (ret) {
1263 dev_err(dev, "Unable to enable device clock.\n");
1264 goto clk_dis_pclk;
1265 }
1266
1267 init_completion(&xqspi->data_completion);
1268
1269 mutex_init(&xqspi->op_lock);
1270
1271 pm_runtime_use_autosuspend(&pdev->dev);
1272 pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT);
1273 pm_runtime_set_active(&pdev->dev);
1274 pm_runtime_enable(&pdev->dev);
1275
1276 ret = pm_runtime_get_sync(&pdev->dev);
1277 if (ret < 0) {
1278 dev_err(&pdev->dev, "Failed to pm_runtime_get_sync: %d\n", ret);
1279 goto clk_dis_all;
1280 }
1281
1282 ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
1283 SPI_TX_DUAL | SPI_TX_QUAD;
1284 ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2;
1285 xqspi->speed_hz = ctlr->max_speed_hz;
1286
1287 /* QSPI controller initializations */
1288 zynqmp_qspi_init_hw(xqspi);
1289
1290 xqspi->irq = platform_get_irq(pdev, 0);
1291 if (xqspi->irq < 0) {
1292 ret = xqspi->irq;
1293 goto clk_dis_all;
1294 }
1295 ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq,
1296 0, pdev->name, xqspi);
1297 if (ret != 0) {
1298 ret = -ENXIO;
1299 dev_err(dev, "request_irq failed\n");
1300 goto clk_dis_all;
1301 }
1302
1303 ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
1304 if (ret)
1305 goto clk_dis_all;
1306
1307 ret = of_property_read_u32(np, "num-cs", &num_cs);
1308 if (ret < 0) {
1309 ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS;
1310 } else if (num_cs > GQSPI_MAX_NUM_CS) {
1311 ret = -EINVAL;
1312 dev_err(&pdev->dev, "only %d chip selects are available\n",
1313 GQSPI_MAX_NUM_CS);
1314 goto clk_dis_all;
1315 } else {
1316 ctlr->num_chipselect = num_cs;
1317 }
1318
1319 ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
1320 ctlr->mem_ops = &zynqmp_qspi_mem_ops;
1321 ctlr->mem_caps = &zynqmp_qspi_mem_caps;
1322 ctlr->setup = zynqmp_qspi_setup_op;
1323 ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
1324 ctlr->dev.of_node = np;
1325 ctlr->auto_runtime_pm = true;
1326
1327 ret = devm_spi_register_controller(&pdev->dev, ctlr);
1328 if (ret) {
1329 dev_err(&pdev->dev, "spi_register_controller failed\n");
1330 goto clk_dis_all;
1331 }
1332
1333 pm_runtime_mark_last_busy(&pdev->dev);
1334 pm_runtime_put_autosuspend(&pdev->dev);
1335
1336 return 0;
1337
1338clk_dis_all:
1339 pm_runtime_disable(&pdev->dev);
1340 pm_runtime_dont_use_autosuspend(&pdev->dev);
1341 pm_runtime_put_noidle(&pdev->dev);
1342 pm_runtime_set_suspended(&pdev->dev);
1343 clk_disable_unprepare(xqspi->refclk);
1344clk_dis_pclk:
1345 clk_disable_unprepare(xqspi->pclk);
1346
1347 return ret;
1348}
1349
1350/**
1351 * zynqmp_qspi_remove - Remove method for the QSPI driver
1352 * @pdev: Pointer to the platform_device structure
1353 *
1354 * This function is called if a device is physically removed from the system or
1355 * if the driver module is being unloaded. It frees all resources allocated to
1356 * the device.
1357 *
1358 * Return: 0 Always
1359 */
1360static void zynqmp_qspi_remove(struct platform_device *pdev)
1361{
1362 struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev);
1363
1364 pm_runtime_get_sync(&pdev->dev);
1365
1366 zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0);
1367
1368 pm_runtime_disable(&pdev->dev);
1369 pm_runtime_dont_use_autosuspend(&pdev->dev);
1370 pm_runtime_put_noidle(&pdev->dev);
1371 pm_runtime_set_suspended(&pdev->dev);
1372 clk_disable_unprepare(xqspi->refclk);
1373 clk_disable_unprepare(xqspi->pclk);
1374}
1375
1376MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match);
1377
1378static struct platform_driver zynqmp_qspi_driver = {
1379 .probe = zynqmp_qspi_probe,
1380 .remove = zynqmp_qspi_remove,
1381 .driver = {
1382 .name = "zynqmp-qspi",
1383 .of_match_table = zynqmp_qspi_of_match,
1384 .pm = &zynqmp_qspi_dev_pm_ops,
1385 },
1386};
1387
1388module_platform_driver(zynqmp_qspi_driver);
1389
1390MODULE_AUTHOR("Xilinx, Inc.");
1391MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver");
1392MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)