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59899843 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
dfe11a11 RW |
2 | /* |
3 | * Xilinx Zynq UltraScale+ MPSoC Quad-SPI (QSPI) controller driver | |
4 | * (master mode only) | |
5 | * | |
6 | * Copyright (C) 2009 - 2015 Xilinx, Inc. | |
dfe11a11 RW |
7 | */ |
8 | ||
9 | #include <linux/clk.h> | |
10 | #include <linux/delay.h> | |
11 | #include <linux/dma-mapping.h> | |
12 | #include <linux/dmaengine.h> | |
ab7b7c71 | 13 | #include <linux/firmware/xlnx-zynqmp.h> |
dfe11a11 RW |
14 | #include <linux/interrupt.h> |
15 | #include <linux/io.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_irq.h> | |
18 | #include <linux/of_address.h> | |
19 | #include <linux/platform_device.h> | |
9e3a0003 | 20 | #include <linux/pm_runtime.h> |
dfe11a11 RW |
21 | #include <linux/spi/spi.h> |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/workqueue.h> | |
1c26372e | 24 | #include <linux/spi/spi-mem.h> |
dfe11a11 RW |
25 | |
26 | /* Generic QSPI register offsets */ | |
27 | #define GQSPI_CONFIG_OFST 0x00000100 | |
28 | #define GQSPI_ISR_OFST 0x00000104 | |
29 | #define GQSPI_IDR_OFST 0x0000010C | |
30 | #define GQSPI_IER_OFST 0x00000108 | |
31 | #define GQSPI_IMASK_OFST 0x00000110 | |
32 | #define GQSPI_EN_OFST 0x00000114 | |
33 | #define GQSPI_TXD_OFST 0x0000011C | |
34 | #define GQSPI_RXD_OFST 0x00000120 | |
35 | #define GQSPI_TX_THRESHOLD_OFST 0x00000128 | |
36 | #define GQSPI_RX_THRESHOLD_OFST 0x0000012C | |
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 | ||
52 | /* GQSPI register bit masks */ | |
53 | #define GQSPI_SEL_MASK 0x00000001 | |
54 | #define GQSPI_EN_MASK 0x00000001 | |
55 | #define GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK 0x00000020 | |
56 | #define GQSPI_ISR_WR_TO_CLR_MASK 0x00000002 | |
57 | #define GQSPI_IDR_ALL_MASK 0x00000FBE | |
58 | #define GQSPI_CFG_MODE_EN_MASK 0xC0000000 | |
59 | #define GQSPI_CFG_GEN_FIFO_START_MODE_MASK 0x20000000 | |
60 | #define GQSPI_CFG_ENDIAN_MASK 0x04000000 | |
61 | #define GQSPI_CFG_EN_POLL_TO_MASK 0x00100000 | |
62 | #define GQSPI_CFG_WP_HOLD_MASK 0x00080000 | |
63 | #define GQSPI_CFG_BAUD_RATE_DIV_MASK 0x00000038 | |
64 | #define GQSPI_CFG_CLK_PHA_MASK 0x00000004 | |
65 | #define GQSPI_CFG_CLK_POL_MASK 0x00000002 | |
66 | #define GQSPI_CFG_START_GEN_FIFO_MASK 0x10000000 | |
67 | #define GQSPI_GENFIFO_IMM_DATA_MASK 0x000000FF | |
68 | #define GQSPI_GENFIFO_DATA_XFER 0x00000100 | |
69 | #define GQSPI_GENFIFO_EXP 0x00000200 | |
70 | #define GQSPI_GENFIFO_MODE_SPI 0x00000400 | |
71 | #define GQSPI_GENFIFO_MODE_DUALSPI 0x00000800 | |
72 | #define GQSPI_GENFIFO_MODE_QUADSPI 0x00000C00 | |
73 | #define GQSPI_GENFIFO_MODE_MASK 0x00000C00 | |
74 | #define GQSPI_GENFIFO_CS_LOWER 0x00001000 | |
75 | #define GQSPI_GENFIFO_CS_UPPER 0x00002000 | |
76 | #define GQSPI_GENFIFO_BUS_LOWER 0x00004000 | |
77 | #define GQSPI_GENFIFO_BUS_UPPER 0x00008000 | |
78 | #define GQSPI_GENFIFO_BUS_BOTH 0x0000C000 | |
79 | #define GQSPI_GENFIFO_BUS_MASK 0x0000C000 | |
80 | #define GQSPI_GENFIFO_TX 0x00010000 | |
81 | #define GQSPI_GENFIFO_RX 0x00020000 | |
82 | #define GQSPI_GENFIFO_STRIPE 0x00040000 | |
83 | #define GQSPI_GENFIFO_POLL 0x00080000 | |
84 | #define GQSPI_GENFIFO_EXP_START 0x00000100 | |
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 | ||
9e3a0003 | 137 | #define SPI_AUTOSUSPEND_TIMEOUT 3000 |
dfe11a11 RW |
138 | enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; |
139 | ||
140 | /** | |
141 | * struct zynqmp_qspi - Defines qspi driver instance | |
142 | * @regs: Virtual address of the QSPI controller registers | |
143 | * @refclk: Pointer to the peripheral clock | |
144 | * @pclk: Pointer to the APB clock | |
145 | * @irq: IRQ number | |
146 | * @dev: Pointer to struct device | |
147 | * @txbuf: Pointer to the TX buffer | |
148 | * @rxbuf: Pointer to the RX buffer | |
149 | * @bytes_to_transfer: Number of bytes left to transfer | |
150 | * @bytes_to_receive: Number of bytes left to receive | |
151 | * @genfifocs: Used for chip select | |
152 | * @genfifobus: Used to select the upper or lower bus | |
153 | * @dma_rx_bytes: Remaining bytes to receive by DMA mode | |
154 | * @dma_addr: DMA address after mapping the kernel buffer | |
155 | * @genfifoentry: Used for storing the genfifoentry instruction. | |
156 | * @mode: Defines the mode in which QSPI is operating | |
1c26372e | 157 | * @data_completion: completion structure |
dfe11a11 RW |
158 | */ |
159 | struct zynqmp_qspi { | |
160 | void __iomem *regs; | |
161 | struct clk *refclk; | |
162 | struct clk *pclk; | |
163 | int irq; | |
164 | struct device *dev; | |
165 | const void *txbuf; | |
166 | void *rxbuf; | |
167 | int bytes_to_transfer; | |
168 | int bytes_to_receive; | |
169 | u32 genfifocs; | |
170 | u32 genfifobus; | |
171 | u32 dma_rx_bytes; | |
172 | dma_addr_t dma_addr; | |
173 | u32 genfifoentry; | |
174 | enum mode_type mode; | |
1c26372e | 175 | struct completion data_completion; |
dfe11a11 RW |
176 | }; |
177 | ||
178 | /** | |
91af6eb0 | 179 | * zynqmp_gqspi_read - For GQSPI controller read operation |
dfe11a11 RW |
180 | * @xqspi: Pointer to the zynqmp_qspi structure |
181 | * @offset: Offset from where to read | |
91af6eb0 | 182 | * Return: Value at the offset |
dfe11a11 RW |
183 | */ |
184 | static u32 zynqmp_gqspi_read(struct zynqmp_qspi *xqspi, u32 offset) | |
185 | { | |
186 | return readl_relaxed(xqspi->regs + offset); | |
187 | } | |
188 | ||
189 | /** | |
91af6eb0 | 190 | * zynqmp_gqspi_write - For GQSPI controller write operation |
dfe11a11 RW |
191 | * @xqspi: Pointer to the zynqmp_qspi structure |
192 | * @offset: Offset where to write | |
193 | * @val: Value to be written | |
194 | */ | |
195 | static inline void zynqmp_gqspi_write(struct zynqmp_qspi *xqspi, u32 offset, | |
196 | u32 val) | |
197 | { | |
198 | writel_relaxed(val, (xqspi->regs + offset)); | |
199 | } | |
200 | ||
201 | /** | |
91af6eb0 | 202 | * zynqmp_gqspi_selectslave - For selection of slave device |
dfe11a11 | 203 | * @instanceptr: Pointer to the zynqmp_qspi structure |
4b42b0b4 LJ |
204 | * @slavecs: For chip select |
205 | * @slavebus: To check which bus is selected- upper or lower | |
dfe11a11 RW |
206 | */ |
207 | static void zynqmp_gqspi_selectslave(struct zynqmp_qspi *instanceptr, | |
208 | u8 slavecs, u8 slavebus) | |
209 | { | |
210 | /* | |
211 | * Bus and CS lines selected here will be updated in the instance and | |
212 | * used for subsequent GENFIFO entries during transfer. | |
213 | */ | |
214 | ||
215 | /* Choose slave select line */ | |
216 | switch (slavecs) { | |
217 | case GQSPI_SELECT_FLASH_CS_BOTH: | |
218 | instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER | | |
219 | GQSPI_GENFIFO_CS_UPPER; | |
861a481c | 220 | break; |
dfe11a11 RW |
221 | case GQSPI_SELECT_FLASH_CS_UPPER: |
222 | instanceptr->genfifocs = GQSPI_GENFIFO_CS_UPPER; | |
223 | break; | |
224 | case GQSPI_SELECT_FLASH_CS_LOWER: | |
225 | instanceptr->genfifocs = GQSPI_GENFIFO_CS_LOWER; | |
226 | break; | |
227 | default: | |
228 | dev_warn(instanceptr->dev, "Invalid slave select\n"); | |
229 | } | |
230 | ||
231 | /* Choose the bus */ | |
232 | switch (slavebus) { | |
233 | case GQSPI_SELECT_FLASH_BUS_BOTH: | |
234 | instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER | | |
235 | GQSPI_GENFIFO_BUS_UPPER; | |
236 | break; | |
237 | case GQSPI_SELECT_FLASH_BUS_UPPER: | |
238 | instanceptr->genfifobus = GQSPI_GENFIFO_BUS_UPPER; | |
239 | break; | |
240 | case GQSPI_SELECT_FLASH_BUS_LOWER: | |
241 | instanceptr->genfifobus = GQSPI_GENFIFO_BUS_LOWER; | |
242 | break; | |
243 | default: | |
244 | dev_warn(instanceptr->dev, "Invalid slave bus\n"); | |
245 | } | |
246 | } | |
247 | ||
248 | /** | |
91af6eb0 | 249 | * zynqmp_qspi_init_hw - Initialize the hardware |
dfe11a11 RW |
250 | * @xqspi: Pointer to the zynqmp_qspi structure |
251 | * | |
252 | * The default settings of the QSPI controller's configurable parameters on | |
253 | * reset are | |
254 | * - Master mode | |
255 | * - TX threshold set to 1 | |
256 | * - RX threshold set to 1 | |
257 | * - Flash memory interface mode enabled | |
258 | * This function performs the following actions | |
259 | * - Disable and clear all the interrupts | |
260 | * - Enable manual slave select | |
261 | * - Enable manual start | |
262 | * - Deselect all the chip select lines | |
263 | * - Set the little endian mode of TX FIFO and | |
264 | * - Enable the QSPI controller | |
265 | */ | |
266 | static void zynqmp_qspi_init_hw(struct zynqmp_qspi *xqspi) | |
267 | { | |
268 | u32 config_reg; | |
269 | ||
270 | /* Select the GQSPI mode */ | |
271 | zynqmp_gqspi_write(xqspi, GQSPI_SEL_OFST, GQSPI_SEL_MASK); | |
272 | /* Clear and disable interrupts */ | |
273 | zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, | |
274 | zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST) | | |
275 | GQSPI_ISR_WR_TO_CLR_MASK); | |
276 | /* Clear the DMA STS */ | |
277 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, | |
278 | zynqmp_gqspi_read(xqspi, | |
279 | GQSPI_QSPIDMA_DST_I_STS_OFST)); | |
280 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_STS_OFST, | |
281 | zynqmp_gqspi_read(xqspi, | |
282 | GQSPI_QSPIDMA_DST_STS_OFST) | | |
283 | GQSPI_QSPIDMA_DST_STS_WTC); | |
284 | zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_IDR_ALL_MASK); | |
285 | zynqmp_gqspi_write(xqspi, | |
286 | GQSPI_QSPIDMA_DST_I_DIS_OFST, | |
287 | GQSPI_QSPIDMA_DST_INTR_ALL_MASK); | |
288 | /* Disable the GQSPI */ | |
289 | zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); | |
290 | config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); | |
291 | config_reg &= ~GQSPI_CFG_MODE_EN_MASK; | |
292 | /* Manual start */ | |
293 | config_reg |= GQSPI_CFG_GEN_FIFO_START_MODE_MASK; | |
294 | /* Little endian by default */ | |
295 | config_reg &= ~GQSPI_CFG_ENDIAN_MASK; | |
296 | /* Disable poll time out */ | |
297 | config_reg &= ~GQSPI_CFG_EN_POLL_TO_MASK; | |
298 | /* Set hold bit */ | |
299 | config_reg |= GQSPI_CFG_WP_HOLD_MASK; | |
300 | /* Clear pre-scalar by default */ | |
301 | config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; | |
302 | /* CPHA 0 */ | |
303 | config_reg &= ~GQSPI_CFG_CLK_PHA_MASK; | |
304 | /* CPOL 0 */ | |
305 | config_reg &= ~GQSPI_CFG_CLK_POL_MASK; | |
306 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); | |
307 | ||
308 | /* Clear the TX and RX FIFO */ | |
309 | zynqmp_gqspi_write(xqspi, GQSPI_FIFO_CTRL_OFST, | |
310 | GQSPI_FIFO_CTRL_RST_RX_FIFO_MASK | | |
311 | GQSPI_FIFO_CTRL_RST_TX_FIFO_MASK | | |
312 | GQSPI_FIFO_CTRL_RST_GEN_FIFO_MASK); | |
313 | /* Set by default to allow for high frequencies */ | |
314 | zynqmp_gqspi_write(xqspi, GQSPI_LPBK_DLY_ADJ_OFST, | |
315 | zynqmp_gqspi_read(xqspi, GQSPI_LPBK_DLY_ADJ_OFST) | | |
316 | GQSPI_LPBK_DLY_ADJ_USE_LPBK_MASK); | |
317 | /* Reset thresholds */ | |
318 | zynqmp_gqspi_write(xqspi, GQSPI_TX_THRESHOLD_OFST, | |
319 | GQSPI_TX_FIFO_THRESHOLD_RESET_VAL); | |
320 | zynqmp_gqspi_write(xqspi, GQSPI_RX_THRESHOLD_OFST, | |
321 | GQSPI_RX_FIFO_THRESHOLD); | |
322 | zynqmp_gqspi_write(xqspi, GQSPI_GF_THRESHOLD_OFST, | |
323 | GQSPI_GEN_FIFO_THRESHOLD_RESET_VAL); | |
324 | zynqmp_gqspi_selectslave(xqspi, | |
325 | GQSPI_SELECT_FLASH_CS_LOWER, | |
326 | GQSPI_SELECT_FLASH_BUS_LOWER); | |
327 | /* Initialize DMA */ | |
328 | zynqmp_gqspi_write(xqspi, | |
f09a433b AKM |
329 | GQSPI_QSPIDMA_DST_CTRL_OFST, |
330 | GQSPI_QSPIDMA_DST_CTRL_RESET_VAL); | |
dfe11a11 RW |
331 | |
332 | /* Enable the GQSPI */ | |
333 | zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); | |
334 | } | |
335 | ||
336 | /** | |
91af6eb0 | 337 | * zynqmp_qspi_copy_read_data - Copy data to RX buffer |
dfe11a11 RW |
338 | * @xqspi: Pointer to the zynqmp_qspi structure |
339 | * @data: The variable where data is stored | |
340 | * @size: Number of bytes to be copied from data to RX buffer | |
341 | */ | |
342 | static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi, | |
343 | ulong data, u8 size) | |
344 | { | |
345 | memcpy(xqspi->rxbuf, &data, size); | |
346 | xqspi->rxbuf += size; | |
347 | xqspi->bytes_to_receive -= size; | |
348 | } | |
349 | ||
dfe11a11 | 350 | /** |
91af6eb0 | 351 | * zynqmp_qspi_chipselect - Select or deselect the chip select line |
dfe11a11 RW |
352 | * @qspi: Pointer to the spi_device structure |
353 | * @is_high: Select(0) or deselect (1) the chip select line | |
354 | */ | |
355 | static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high) | |
356 | { | |
357 | struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master); | |
358 | ulong timeout; | |
1c26372e | 359 | u32 genfifoentry = 0, statusreg; |
dfe11a11 RW |
360 | |
361 | genfifoentry |= GQSPI_GENFIFO_MODE_SPI; | |
dfe11a11 RW |
362 | |
363 | if (!is_high) { | |
1c26372e AKM |
364 | xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER; |
365 | xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER; | |
366 | genfifoentry |= xqspi->genfifobus; | |
dfe11a11 RW |
367 | genfifoentry |= xqspi->genfifocs; |
368 | genfifoentry |= GQSPI_GENFIFO_CS_SETUP; | |
369 | } else { | |
370 | genfifoentry |= GQSPI_GENFIFO_CS_HOLD; | |
371 | } | |
372 | ||
373 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); | |
374 | ||
dfe11a11 RW |
375 | /* Manually start the generic FIFO command */ |
376 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
f09a433b AKM |
377 | zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | |
378 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
dfe11a11 RW |
379 | |
380 | timeout = jiffies + msecs_to_jiffies(1000); | |
381 | ||
382 | /* Wait until the generic FIFO command is empty */ | |
383 | do { | |
384 | statusreg = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); | |
385 | ||
386 | if ((statusreg & GQSPI_ISR_GENFIFOEMPTY_MASK) && | |
f09a433b | 387 | (statusreg & GQSPI_ISR_TXEMPTY_MASK)) |
dfe11a11 | 388 | break; |
f09a433b | 389 | cpu_relax(); |
dfe11a11 RW |
390 | } while (!time_after_eq(jiffies, timeout)); |
391 | ||
392 | if (time_after_eq(jiffies, timeout)) | |
393 | dev_err(xqspi->dev, "Chip select timed out\n"); | |
394 | } | |
395 | ||
396 | /** | |
1c26372e AKM |
397 | * zynqmp_qspi_selectspimode - Selects SPI mode - x1 or x2 or x4. |
398 | * @xqspi: xqspi is a pointer to the GQSPI instance | |
399 | * @spimode: spimode - SPI or DUAL or QUAD. | |
400 | * Return: Mask to set desired SPI mode in GENFIFO entry. | |
401 | */ | |
402 | static inline u32 zynqmp_qspi_selectspimode(struct zynqmp_qspi *xqspi, | |
403 | u8 spimode) | |
404 | { | |
405 | u32 mask = 0; | |
406 | ||
407 | switch (spimode) { | |
408 | case GQSPI_SELECT_MODE_DUALSPI: | |
409 | mask = GQSPI_GENFIFO_MODE_DUALSPI; | |
410 | break; | |
411 | case GQSPI_SELECT_MODE_QUADSPI: | |
412 | mask = GQSPI_GENFIFO_MODE_QUADSPI; | |
413 | break; | |
414 | case GQSPI_SELECT_MODE_SPI: | |
415 | mask = GQSPI_GENFIFO_MODE_SPI; | |
416 | break; | |
417 | default: | |
418 | dev_warn(xqspi->dev, "Invalid SPI mode\n"); | |
419 | } | |
420 | ||
421 | return mask; | |
422 | } | |
423 | ||
424 | /** | |
425 | * zynqmp_qspi_config_op - Configure QSPI controller for specified | |
dfe11a11 | 426 | * transfer |
1c26372e | 427 | * @xqspi: Pointer to the zynqmp_qspi structure |
dfe11a11 | 428 | * @qspi: Pointer to the spi_device structure |
dfe11a11 RW |
429 | * |
430 | * Sets the operational mode of QSPI controller for the next QSPI transfer and | |
431 | * sets the requested clock frequency. | |
432 | * | |
433 | * Return: Always 0 | |
434 | * | |
435 | * Note: | |
436 | * If the requested frequency is not an exact match with what can be | |
437 | * obtained using the pre-scalar value, the driver sets the clock | |
438 | * frequency which is lower than the requested frequency (maximum lower) | |
439 | * for the transfer. | |
440 | * | |
441 | * If the requested frequency is higher or lower than that is supported | |
442 | * by the QSPI controller the driver will set the highest or lowest | |
443 | * frequency supported by controller. | |
444 | */ | |
1c26372e AKM |
445 | static int zynqmp_qspi_config_op(struct zynqmp_qspi *xqspi, |
446 | struct spi_device *qspi) | |
dfe11a11 | 447 | { |
dfe11a11 | 448 | ulong clk_rate; |
1c26372e | 449 | u32 config_reg, baud_rate_val = 0; |
dfe11a11 RW |
450 | |
451 | /* Set the clock frequency */ | |
452 | /* If req_hz == 0, default to lowest speed */ | |
453 | clk_rate = clk_get_rate(xqspi->refclk); | |
454 | ||
455 | while ((baud_rate_val < GQSPI_BAUD_DIV_MAX) && | |
456 | (clk_rate / | |
1c26372e | 457 | (GQSPI_BAUD_DIV_SHIFT << baud_rate_val)) > qspi->max_speed_hz) |
dfe11a11 RW |
458 | baud_rate_val++; |
459 | ||
460 | config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); | |
461 | ||
462 | /* Set the QSPI clock phase and clock polarity */ | |
463 | config_reg &= (~GQSPI_CFG_CLK_PHA_MASK) & (~GQSPI_CFG_CLK_POL_MASK); | |
464 | ||
465 | if (qspi->mode & SPI_CPHA) | |
466 | config_reg |= GQSPI_CFG_CLK_PHA_MASK; | |
467 | if (qspi->mode & SPI_CPOL) | |
468 | config_reg |= GQSPI_CFG_CLK_POL_MASK; | |
469 | ||
470 | config_reg &= ~GQSPI_CFG_BAUD_RATE_DIV_MASK; | |
471 | config_reg |= (baud_rate_val << GQSPI_CFG_BAUD_RATE_DIV_SHIFT); | |
472 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /** | |
1c26372e | 477 | * zynqmp_qspi_setup_op - Configure the QSPI controller |
dfe11a11 RW |
478 | * @qspi: Pointer to the spi_device structure |
479 | * | |
480 | * Sets the operational mode of QSPI controller for the next QSPI transfer, | |
481 | * baud rate and divisor value to setup the requested qspi clock. | |
482 | * | |
483 | * Return: 0 on success; error value otherwise. | |
484 | */ | |
1c26372e | 485 | static int zynqmp_qspi_setup_op(struct spi_device *qspi) |
dfe11a11 | 486 | { |
1c26372e AKM |
487 | struct spi_controller *ctlr = qspi->master; |
488 | struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr); | |
489 | struct device *dev = &ctlr->dev; | |
490 | int ret; | |
491 | ||
492 | if (ctlr->busy) | |
dfe11a11 | 493 | return -EBUSY; |
1c26372e AKM |
494 | |
495 | ret = clk_enable(xqspi->refclk); | |
496 | if (ret) { | |
497 | dev_err(dev, "Cannot enable device clock.\n"); | |
498 | return ret; | |
499 | } | |
500 | ||
501 | ret = clk_enable(xqspi->pclk); | |
502 | if (ret) { | |
503 | dev_err(dev, "Cannot enable APB clock.\n"); | |
504 | clk_disable(xqspi->refclk); | |
505 | return ret; | |
506 | } | |
507 | zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); | |
508 | ||
dfe11a11 RW |
509 | return 0; |
510 | } | |
511 | ||
512 | /** | |
91af6eb0 | 513 | * zynqmp_qspi_filltxfifo - Fills the TX FIFO as long as there is room in |
dfe11a11 RW |
514 | * the FIFO or the bytes required to be |
515 | * transmitted. | |
516 | * @xqspi: Pointer to the zynqmp_qspi structure | |
517 | * @size: Number of bytes to be copied from TX buffer to TX FIFO | |
518 | */ | |
519 | static void zynqmp_qspi_filltxfifo(struct zynqmp_qspi *xqspi, int size) | |
520 | { | |
521 | u32 count = 0, intermediate; | |
522 | ||
523 | while ((xqspi->bytes_to_transfer > 0) && (count < size)) { | |
524 | memcpy(&intermediate, xqspi->txbuf, 4); | |
525 | zynqmp_gqspi_write(xqspi, GQSPI_TXD_OFST, intermediate); | |
526 | ||
527 | if (xqspi->bytes_to_transfer >= 4) { | |
528 | xqspi->txbuf += 4; | |
529 | xqspi->bytes_to_transfer -= 4; | |
530 | } else { | |
531 | xqspi->txbuf += xqspi->bytes_to_transfer; | |
532 | xqspi->bytes_to_transfer = 0; | |
533 | } | |
534 | count++; | |
535 | } | |
536 | } | |
537 | ||
538 | /** | |
91af6eb0 | 539 | * zynqmp_qspi_readrxfifo - Fills the RX FIFO as long as there is room in |
dfe11a11 RW |
540 | * the FIFO. |
541 | * @xqspi: Pointer to the zynqmp_qspi structure | |
542 | * @size: Number of bytes to be copied from RX buffer to RX FIFO | |
543 | */ | |
544 | static void zynqmp_qspi_readrxfifo(struct zynqmp_qspi *xqspi, u32 size) | |
545 | { | |
546 | ulong data; | |
547 | int count = 0; | |
548 | ||
549 | while ((count < size) && (xqspi->bytes_to_receive > 0)) { | |
550 | if (xqspi->bytes_to_receive >= 4) { | |
f09a433b | 551 | (*(u32 *)xqspi->rxbuf) = |
dfe11a11 RW |
552 | zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); |
553 | xqspi->rxbuf += 4; | |
554 | xqspi->bytes_to_receive -= 4; | |
555 | count += 4; | |
556 | } else { | |
557 | data = zynqmp_gqspi_read(xqspi, GQSPI_RXD_OFST); | |
558 | count += xqspi->bytes_to_receive; | |
559 | zynqmp_qspi_copy_read_data(xqspi, data, | |
560 | xqspi->bytes_to_receive); | |
561 | xqspi->bytes_to_receive = 0; | |
562 | } | |
563 | } | |
564 | } | |
565 | ||
1c26372e AKM |
566 | /** |
567 | * zynqmp_qspi_fillgenfifo - Fills the GENFIFO. | |
568 | * @xqspi: Pointer to the zynqmp_qspi structure | |
569 | * @nbits: Transfer/Receive buswidth. | |
570 | * @genfifoentry: Variable in which GENFIFO mask is saved | |
571 | */ | |
572 | static void zynqmp_qspi_fillgenfifo(struct zynqmp_qspi *xqspi, u8 nbits, | |
573 | u32 genfifoentry) | |
574 | { | |
575 | u32 transfer_len = 0; | |
576 | ||
577 | if (xqspi->txbuf) { | |
578 | genfifoentry &= ~GQSPI_GENFIFO_RX; | |
579 | genfifoentry |= GQSPI_GENFIFO_DATA_XFER; | |
580 | genfifoentry |= GQSPI_GENFIFO_TX; | |
581 | transfer_len = xqspi->bytes_to_transfer; | |
582 | } else { | |
583 | genfifoentry &= ~GQSPI_GENFIFO_TX; | |
584 | genfifoentry |= GQSPI_GENFIFO_DATA_XFER; | |
585 | genfifoentry |= GQSPI_GENFIFO_RX; | |
586 | if (xqspi->mode == GQSPI_MODE_DMA) | |
587 | transfer_len = xqspi->dma_rx_bytes; | |
588 | else | |
589 | transfer_len = xqspi->bytes_to_receive; | |
590 | } | |
591 | genfifoentry |= zynqmp_qspi_selectspimode(xqspi, nbits); | |
592 | xqspi->genfifoentry = genfifoentry; | |
593 | ||
594 | if ((transfer_len) < GQSPI_GENFIFO_IMM_DATA_MASK) { | |
595 | genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; | |
596 | genfifoentry |= transfer_len; | |
597 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); | |
598 | } else { | |
599 | int tempcount = transfer_len; | |
600 | u32 exponent = 8; /* 2^8 = 256 */ | |
601 | u8 imm_data = tempcount & 0xFF; | |
602 | ||
603 | tempcount &= ~(tempcount & 0xFF); | |
604 | /* Immediate entry */ | |
605 | if (tempcount != 0) { | |
606 | /* Exponent entries */ | |
607 | genfifoentry |= GQSPI_GENFIFO_EXP; | |
608 | while (tempcount != 0) { | |
609 | if (tempcount & GQSPI_GENFIFO_EXP_START) { | |
610 | genfifoentry &= | |
611 | ~GQSPI_GENFIFO_IMM_DATA_MASK; | |
612 | genfifoentry |= exponent; | |
613 | zynqmp_gqspi_write(xqspi, | |
614 | GQSPI_GEN_FIFO_OFST, | |
615 | genfifoentry); | |
616 | } | |
617 | tempcount = tempcount >> 1; | |
618 | exponent++; | |
619 | } | |
620 | } | |
621 | if (imm_data != 0) { | |
622 | genfifoentry &= ~GQSPI_GENFIFO_EXP; | |
623 | genfifoentry &= ~GQSPI_GENFIFO_IMM_DATA_MASK; | |
624 | genfifoentry |= (u8)(imm_data & 0xFF); | |
625 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, | |
626 | genfifoentry); | |
627 | } | |
628 | } | |
629 | if (xqspi->mode == GQSPI_MODE_IO && xqspi->rxbuf) { | |
630 | /* Dummy generic FIFO entry */ | |
631 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); | |
632 | } | |
633 | } | |
634 | ||
dfe11a11 | 635 | /** |
91af6eb0 | 636 | * zynqmp_process_dma_irq - Handler for DMA done interrupt of QSPI |
dfe11a11 RW |
637 | * controller |
638 | * @xqspi: zynqmp_qspi instance pointer | |
639 | * | |
640 | * This function handles DMA interrupt only. | |
641 | */ | |
642 | static void zynqmp_process_dma_irq(struct zynqmp_qspi *xqspi) | |
643 | { | |
644 | u32 config_reg, genfifoentry; | |
645 | ||
646 | dma_unmap_single(xqspi->dev, xqspi->dma_addr, | |
f09a433b | 647 | xqspi->dma_rx_bytes, DMA_FROM_DEVICE); |
dfe11a11 RW |
648 | xqspi->rxbuf += xqspi->dma_rx_bytes; |
649 | xqspi->bytes_to_receive -= xqspi->dma_rx_bytes; | |
650 | xqspi->dma_rx_bytes = 0; | |
651 | ||
652 | /* Disabling the DMA interrupts */ | |
653 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_DIS_OFST, | |
f09a433b | 654 | GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); |
dfe11a11 RW |
655 | |
656 | if (xqspi->bytes_to_receive > 0) { | |
657 | /* Switch to IO mode,for remaining bytes to receive */ | |
658 | config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); | |
659 | config_reg &= ~GQSPI_CFG_MODE_EN_MASK; | |
660 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); | |
661 | ||
662 | /* Initiate the transfer of remaining bytes */ | |
663 | genfifoentry = xqspi->genfifoentry; | |
664 | genfifoentry |= xqspi->bytes_to_receive; | |
665 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, genfifoentry); | |
666 | ||
667 | /* Dummy generic FIFO entry */ | |
668 | zynqmp_gqspi_write(xqspi, GQSPI_GEN_FIFO_OFST, 0x0); | |
669 | ||
670 | /* Manual start */ | |
671 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
f09a433b AKM |
672 | (zynqmp_gqspi_read(xqspi, |
673 | GQSPI_CONFIG_OFST) | | |
674 | GQSPI_CFG_START_GEN_FIFO_MASK)); | |
dfe11a11 RW |
675 | |
676 | /* Enable the RX interrupts for IO mode */ | |
677 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
f09a433b AKM |
678 | GQSPI_IER_GENFIFOEMPTY_MASK | |
679 | GQSPI_IER_RXNEMPTY_MASK | | |
680 | GQSPI_IER_RXEMPTY_MASK); | |
dfe11a11 RW |
681 | } |
682 | } | |
683 | ||
684 | /** | |
91af6eb0 | 685 | * zynqmp_qspi_irq - Interrupt service routine of the QSPI controller |
dfe11a11 RW |
686 | * @irq: IRQ number |
687 | * @dev_id: Pointer to the xqspi structure | |
688 | * | |
689 | * This function handles TX empty only. | |
690 | * On TX empty interrupt this function reads the received data from RX FIFO | |
691 | * and fills the TX FIFO if there is any data remaining to be transferred. | |
692 | * | |
693 | * Return: IRQ_HANDLED when interrupt is handled | |
694 | * IRQ_NONE otherwise. | |
695 | */ | |
696 | static irqreturn_t zynqmp_qspi_irq(int irq, void *dev_id) | |
697 | { | |
1c26372e AKM |
698 | struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_id; |
699 | irqreturn_t ret = IRQ_NONE; | |
dfe11a11 RW |
700 | u32 status, mask, dma_status = 0; |
701 | ||
702 | status = zynqmp_gqspi_read(xqspi, GQSPI_ISR_OFST); | |
703 | zynqmp_gqspi_write(xqspi, GQSPI_ISR_OFST, status); | |
704 | mask = (status & ~(zynqmp_gqspi_read(xqspi, GQSPI_IMASK_OFST))); | |
705 | ||
706 | /* Read and clear DMA status */ | |
707 | if (xqspi->mode == GQSPI_MODE_DMA) { | |
708 | dma_status = | |
709 | zynqmp_gqspi_read(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST); | |
710 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_I_STS_OFST, | |
f09a433b | 711 | dma_status); |
dfe11a11 RW |
712 | } |
713 | ||
714 | if (mask & GQSPI_ISR_TXNOT_FULL_MASK) { | |
715 | zynqmp_qspi_filltxfifo(xqspi, GQSPI_TX_FIFO_FILL); | |
716 | ret = IRQ_HANDLED; | |
717 | } | |
718 | ||
719 | if (dma_status & GQSPI_QSPIDMA_DST_I_STS_DONE_MASK) { | |
720 | zynqmp_process_dma_irq(xqspi); | |
721 | ret = IRQ_HANDLED; | |
722 | } else if (!(mask & GQSPI_IER_RXEMPTY_MASK) && | |
723 | (mask & GQSPI_IER_GENFIFOEMPTY_MASK)) { | |
724 | zynqmp_qspi_readrxfifo(xqspi, GQSPI_RX_FIFO_FILL); | |
725 | ret = IRQ_HANDLED; | |
726 | } | |
727 | ||
f09a433b AKM |
728 | if (xqspi->bytes_to_receive == 0 && xqspi->bytes_to_transfer == 0 && |
729 | ((status & GQSPI_IRQ_MASK) == GQSPI_IRQ_MASK)) { | |
dfe11a11 | 730 | zynqmp_gqspi_write(xqspi, GQSPI_IDR_OFST, GQSPI_ISR_IDR_MASK); |
1c26372e | 731 | complete(&xqspi->data_completion); |
dfe11a11 RW |
732 | ret = IRQ_HANDLED; |
733 | } | |
734 | return ret; | |
735 | } | |
736 | ||
737 | /** | |
1c26372e | 738 | * zynqmp_qspi_setuprxdma - This function sets up the RX DMA operation |
dfe11a11 RW |
739 | * @xqspi: xqspi is a pointer to the GQSPI instance. |
740 | */ | |
1c26372e | 741 | static void zynqmp_qspi_setuprxdma(struct zynqmp_qspi *xqspi) |
dfe11a11 RW |
742 | { |
743 | u32 rx_bytes, rx_rem, config_reg; | |
744 | dma_addr_t addr; | |
745 | u64 dma_align = (u64)(uintptr_t)xqspi->rxbuf; | |
746 | ||
f09a433b AKM |
747 | if (xqspi->bytes_to_receive < 8 || |
748 | ((dma_align & GQSPI_DMA_UNALIGN) != 0x0)) { | |
dfe11a11 RW |
749 | /* Setting to IO mode */ |
750 | config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); | |
751 | config_reg &= ~GQSPI_CFG_MODE_EN_MASK; | |
752 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); | |
753 | xqspi->mode = GQSPI_MODE_IO; | |
754 | xqspi->dma_rx_bytes = 0; | |
755 | return; | |
756 | } | |
757 | ||
758 | rx_rem = xqspi->bytes_to_receive % 4; | |
759 | rx_bytes = (xqspi->bytes_to_receive - rx_rem); | |
760 | ||
761 | addr = dma_map_single(xqspi->dev, (void *)xqspi->rxbuf, | |
f09a433b | 762 | rx_bytes, DMA_FROM_DEVICE); |
dfe11a11 RW |
763 | if (dma_mapping_error(xqspi->dev, addr)) |
764 | dev_err(xqspi->dev, "ERR:rxdma:memory not mapped\n"); | |
765 | ||
766 | xqspi->dma_rx_bytes = rx_bytes; | |
767 | xqspi->dma_addr = addr; | |
768 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_OFST, | |
f09a433b | 769 | (u32)(addr & 0xffffffff)); |
dfe11a11 RW |
770 | addr = ((addr >> 16) >> 16); |
771 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_ADDR_MSB_OFST, | |
f09a433b | 772 | ((u32)addr) & 0xfff); |
dfe11a11 RW |
773 | |
774 | /* Enabling the DMA mode */ | |
775 | config_reg = zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST); | |
776 | config_reg &= ~GQSPI_CFG_MODE_EN_MASK; | |
777 | config_reg |= GQSPI_CFG_MODE_EN_DMA_MASK; | |
778 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, config_reg); | |
779 | ||
780 | /* Switch to DMA mode */ | |
781 | xqspi->mode = GQSPI_MODE_DMA; | |
782 | ||
783 | /* Write the number of bytes to transfer */ | |
784 | zynqmp_gqspi_write(xqspi, GQSPI_QSPIDMA_DST_SIZE_OFST, rx_bytes); | |
785 | } | |
786 | ||
787 | /** | |
1c26372e AKM |
788 | * zynqmp_qspi_write_op - This function sets up the GENFIFO entries, |
789 | * TX FIFO, and fills the TX FIFO with as many | |
790 | * bytes as possible. | |
791 | * @xqspi: Pointer to the GQSPI instance. | |
792 | * @tx_nbits: Transfer buswidth. | |
793 | * @genfifoentry: Variable in which GENFIFO mask is returned | |
794 | * to calling function | |
dfe11a11 | 795 | */ |
1c26372e AKM |
796 | static void zynqmp_qspi_write_op(struct zynqmp_qspi *xqspi, u8 tx_nbits, |
797 | u32 genfifoentry) | |
dfe11a11 RW |
798 | { |
799 | u32 config_reg; | |
800 | ||
1c26372e AKM |
801 | zynqmp_qspi_fillgenfifo(xqspi, tx_nbits, genfifoentry); |
802 | zynqmp_qspi_filltxfifo(xqspi, GQSPI_TXD_DEPTH); | |
803 | if (xqspi->mode == GQSPI_MODE_DMA) { | |
804 | config_reg = zynqmp_gqspi_read(xqspi, | |
805 | GQSPI_CONFIG_OFST); | |
806 | config_reg &= ~GQSPI_CFG_MODE_EN_MASK; | |
807 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
808 | config_reg); | |
809 | xqspi->mode = GQSPI_MODE_IO; | |
dfe11a11 RW |
810 | } |
811 | } | |
812 | ||
813 | /** | |
1c26372e AKM |
814 | * zynqmp_qspi_read_op - This function sets up the GENFIFO entries and |
815 | * RX DMA operation. | |
816 | * @xqspi: xqspi is a pointer to the GQSPI instance. | |
817 | * @rx_nbits: Receive buswidth. | |
818 | * @genfifoentry: genfifoentry is pointer to the variable in which | |
819 | * GENFIFO mask is returned to calling function | |
dfe11a11 | 820 | */ |
1c26372e AKM |
821 | static void zynqmp_qspi_read_op(struct zynqmp_qspi *xqspi, u8 rx_nbits, |
822 | u32 genfifoentry) | |
dfe11a11 | 823 | { |
1c26372e AKM |
824 | zynqmp_qspi_fillgenfifo(xqspi, rx_nbits, genfifoentry); |
825 | zynqmp_qspi_setuprxdma(xqspi); | |
dfe11a11 RW |
826 | } |
827 | ||
828 | /** | |
91af6eb0 | 829 | * zynqmp_qspi_suspend - Suspend method for the QSPI driver |
4b42b0b4 | 830 | * @dev: Address of the platform_device structure |
dfe11a11 RW |
831 | * |
832 | * This function stops the QSPI driver queue and disables the QSPI controller | |
833 | * | |
834 | * Return: Always 0 | |
835 | */ | |
836 | static int __maybe_unused zynqmp_qspi_suspend(struct device *dev) | |
837 | { | |
1c26372e AKM |
838 | struct spi_controller *ctlr = dev_get_drvdata(dev); |
839 | struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr); | |
dfe11a11 | 840 | |
1c26372e | 841 | spi_controller_suspend(ctlr); |
dfe11a11 | 842 | |
1c26372e | 843 | zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); |
dfe11a11 RW |
844 | |
845 | return 0; | |
846 | } | |
847 | ||
848 | /** | |
91af6eb0 | 849 | * zynqmp_qspi_resume - Resume method for the QSPI driver |
dfe11a11 RW |
850 | * @dev: Address of the platform_device structure |
851 | * | |
852 | * The function starts the QSPI driver queue and initializes the QSPI | |
853 | * controller | |
854 | * | |
855 | * Return: 0 on success; error value otherwise | |
856 | */ | |
857 | static int __maybe_unused zynqmp_qspi_resume(struct device *dev) | |
858 | { | |
1c26372e AKM |
859 | struct spi_controller *ctlr = dev_get_drvdata(dev); |
860 | struct zynqmp_qspi *xqspi = spi_controller_get_devdata(ctlr); | |
dfe11a11 RW |
861 | int ret = 0; |
862 | ||
863 | ret = clk_enable(xqspi->pclk); | |
864 | if (ret) { | |
865 | dev_err(dev, "Cannot enable APB clock.\n"); | |
866 | return ret; | |
867 | } | |
868 | ||
869 | ret = clk_enable(xqspi->refclk); | |
870 | if (ret) { | |
871 | dev_err(dev, "Cannot enable device clock.\n"); | |
872 | clk_disable(xqspi->pclk); | |
873 | return ret; | |
874 | } | |
875 | ||
1c26372e | 876 | spi_controller_resume(ctlr); |
dfe11a11 | 877 | |
9e3a0003 NSR |
878 | clk_disable(xqspi->refclk); |
879 | clk_disable(xqspi->pclk); | |
dfe11a11 RW |
880 | return 0; |
881 | } | |
882 | ||
9e3a0003 NSR |
883 | /** |
884 | * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver | |
885 | * @dev: Address of the platform_device structure | |
886 | * | |
887 | * This function disables the clocks | |
888 | * | |
889 | * Return: Always 0 | |
890 | */ | |
891 | static int __maybe_unused zynqmp_runtime_suspend(struct device *dev) | |
892 | { | |
1c26372e | 893 | struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev); |
9e3a0003 NSR |
894 | |
895 | clk_disable(xqspi->refclk); | |
896 | clk_disable(xqspi->pclk); | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | /** | |
902 | * zynqmp_runtime_resume - Runtime resume method for the SPI driver | |
903 | * @dev: Address of the platform_device structure | |
904 | * | |
905 | * This function enables the clocks | |
906 | * | |
907 | * Return: 0 on success and error value on error | |
908 | */ | |
909 | static int __maybe_unused zynqmp_runtime_resume(struct device *dev) | |
910 | { | |
1c26372e | 911 | struct zynqmp_qspi *xqspi = (struct zynqmp_qspi *)dev_get_drvdata(dev); |
9e3a0003 NSR |
912 | int ret; |
913 | ||
914 | ret = clk_enable(xqspi->pclk); | |
915 | if (ret) { | |
916 | dev_err(dev, "Cannot enable APB clock.\n"); | |
917 | return ret; | |
918 | } | |
919 | ||
920 | ret = clk_enable(xqspi->refclk); | |
921 | if (ret) { | |
922 | dev_err(dev, "Cannot enable device clock.\n"); | |
923 | clk_disable(xqspi->pclk); | |
924 | return ret; | |
925 | } | |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
1c26372e AKM |
930 | /** |
931 | * zynqmp_qspi_exec_op() - Initiates the QSPI transfer | |
932 | * @mem: The SPI memory | |
933 | * @op: The memory operation to execute | |
934 | * | |
935 | * Executes a memory operation. | |
936 | * | |
937 | * This function first selects the chip and starts the memory operation. | |
938 | * | |
939 | * Return: 0 in case of success, a negative error code otherwise. | |
940 | */ | |
941 | static int zynqmp_qspi_exec_op(struct spi_mem *mem, | |
942 | const struct spi_mem_op *op) | |
943 | { | |
944 | struct zynqmp_qspi *xqspi = spi_controller_get_devdata | |
945 | (mem->spi->master); | |
946 | int err = 0, i; | |
947 | u8 *tmpbuf; | |
948 | u32 genfifoentry = 0; | |
949 | ||
950 | dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n", | |
951 | op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth, | |
952 | op->dummy.buswidth, op->data.buswidth); | |
953 | ||
954 | zynqmp_qspi_config_op(xqspi, mem->spi); | |
955 | zynqmp_qspi_chipselect(mem->spi, false); | |
956 | genfifoentry |= xqspi->genfifocs; | |
957 | genfifoentry |= xqspi->genfifobus; | |
958 | ||
959 | if (op->cmd.opcode) { | |
960 | tmpbuf = kzalloc(op->cmd.nbytes, GFP_KERNEL | GFP_DMA); | |
961 | if (!tmpbuf) | |
962 | return -ENOMEM; | |
963 | tmpbuf[0] = op->cmd.opcode; | |
964 | reinit_completion(&xqspi->data_completion); | |
965 | xqspi->txbuf = tmpbuf; | |
966 | xqspi->rxbuf = NULL; | |
967 | xqspi->bytes_to_transfer = op->cmd.nbytes; | |
968 | xqspi->bytes_to_receive = 0; | |
969 | zynqmp_qspi_write_op(xqspi, op->cmd.buswidth, genfifoentry); | |
970 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
971 | zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | | |
972 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
973 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
974 | GQSPI_IER_GENFIFOEMPTY_MASK | | |
975 | GQSPI_IER_TXNOT_FULL_MASK); | |
976 | if (!wait_for_completion_interruptible_timeout | |
977 | (&xqspi->data_completion, msecs_to_jiffies(1000))) { | |
978 | err = -ETIMEDOUT; | |
979 | kfree(tmpbuf); | |
980 | goto return_err; | |
981 | } | |
982 | kfree(tmpbuf); | |
983 | } | |
984 | ||
985 | if (op->addr.nbytes) { | |
986 | for (i = 0; i < op->addr.nbytes; i++) { | |
987 | *(((u8 *)xqspi->txbuf) + i) = op->addr.val >> | |
988 | (8 * (op->addr.nbytes - i - 1)); | |
989 | } | |
990 | ||
991 | reinit_completion(&xqspi->data_completion); | |
992 | xqspi->rxbuf = NULL; | |
993 | xqspi->bytes_to_transfer = op->addr.nbytes; | |
994 | xqspi->bytes_to_receive = 0; | |
995 | zynqmp_qspi_write_op(xqspi, op->addr.buswidth, genfifoentry); | |
996 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
997 | zynqmp_gqspi_read(xqspi, | |
998 | GQSPI_CONFIG_OFST) | | |
999 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
1000 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
1001 | GQSPI_IER_TXEMPTY_MASK | | |
1002 | GQSPI_IER_GENFIFOEMPTY_MASK | | |
1003 | GQSPI_IER_TXNOT_FULL_MASK); | |
1004 | if (!wait_for_completion_interruptible_timeout | |
1005 | (&xqspi->data_completion, msecs_to_jiffies(1000))) { | |
1006 | err = -ETIMEDOUT; | |
1007 | goto return_err; | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | if (op->dummy.nbytes) { | |
1012 | tmpbuf = kzalloc(op->dummy.nbytes, GFP_KERNEL | GFP_DMA); | |
1013 | if (!tmpbuf) | |
1014 | return -ENOMEM; | |
1015 | memset(tmpbuf, 0xff, op->dummy.nbytes); | |
1016 | reinit_completion(&xqspi->data_completion); | |
1017 | xqspi->txbuf = tmpbuf; | |
1018 | xqspi->rxbuf = NULL; | |
1019 | xqspi->bytes_to_transfer = op->dummy.nbytes; | |
1020 | xqspi->bytes_to_receive = 0; | |
1021 | zynqmp_qspi_write_op(xqspi, op->dummy.buswidth, | |
1022 | genfifoentry); | |
1023 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
1024 | zynqmp_gqspi_read(xqspi, GQSPI_CONFIG_OFST) | | |
1025 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
1026 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
1027 | GQSPI_IER_TXEMPTY_MASK | | |
1028 | GQSPI_IER_GENFIFOEMPTY_MASK | | |
1029 | GQSPI_IER_TXNOT_FULL_MASK); | |
1030 | if (!wait_for_completion_interruptible_timeout | |
1031 | (&xqspi->data_completion, msecs_to_jiffies(1000))) { | |
1032 | err = -ETIMEDOUT; | |
1033 | kfree(tmpbuf); | |
1034 | goto return_err; | |
1035 | } | |
1036 | ||
1037 | kfree(tmpbuf); | |
1038 | } | |
1039 | ||
1040 | if (op->data.nbytes) { | |
1041 | reinit_completion(&xqspi->data_completion); | |
1042 | if (op->data.dir == SPI_MEM_DATA_OUT) { | |
1043 | xqspi->txbuf = (u8 *)op->data.buf.out; | |
1044 | xqspi->rxbuf = NULL; | |
1045 | xqspi->bytes_to_transfer = op->data.nbytes; | |
1046 | xqspi->bytes_to_receive = 0; | |
1047 | zynqmp_qspi_write_op(xqspi, op->data.buswidth, | |
1048 | genfifoentry); | |
1049 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
1050 | zynqmp_gqspi_read | |
1051 | (xqspi, GQSPI_CONFIG_OFST) | | |
1052 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
1053 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
1054 | GQSPI_IER_TXEMPTY_MASK | | |
1055 | GQSPI_IER_GENFIFOEMPTY_MASK | | |
1056 | GQSPI_IER_TXNOT_FULL_MASK); | |
1057 | } else { | |
1058 | xqspi->txbuf = NULL; | |
1059 | xqspi->rxbuf = (u8 *)op->data.buf.in; | |
1060 | xqspi->bytes_to_receive = op->data.nbytes; | |
1061 | xqspi->bytes_to_transfer = 0; | |
1062 | zynqmp_qspi_read_op(xqspi, op->data.buswidth, | |
1063 | genfifoentry); | |
1064 | zynqmp_gqspi_write(xqspi, GQSPI_CONFIG_OFST, | |
1065 | zynqmp_gqspi_read | |
1066 | (xqspi, GQSPI_CONFIG_OFST) | | |
1067 | GQSPI_CFG_START_GEN_FIFO_MASK); | |
1068 | if (xqspi->mode == GQSPI_MODE_DMA) { | |
1069 | zynqmp_gqspi_write | |
1070 | (xqspi, GQSPI_QSPIDMA_DST_I_EN_OFST, | |
1071 | GQSPI_QSPIDMA_DST_I_EN_DONE_MASK); | |
1072 | } else { | |
1073 | zynqmp_gqspi_write(xqspi, GQSPI_IER_OFST, | |
1074 | GQSPI_IER_GENFIFOEMPTY_MASK | | |
1075 | GQSPI_IER_RXNEMPTY_MASK | | |
1076 | GQSPI_IER_RXEMPTY_MASK); | |
1077 | } | |
1078 | } | |
1079 | if (!wait_for_completion_interruptible_timeout | |
1080 | (&xqspi->data_completion, msecs_to_jiffies(1000))) | |
1081 | err = -ETIMEDOUT; | |
1082 | } | |
1083 | ||
1084 | return_err: | |
1085 | ||
1086 | zynqmp_qspi_chipselect(mem->spi, true); | |
1087 | ||
1088 | return err; | |
1089 | } | |
1090 | ||
9e3a0003 NSR |
1091 | static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = { |
1092 | SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend, | |
1093 | zynqmp_runtime_resume, NULL) | |
1094 | SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume) | |
1095 | }; | |
dfe11a11 | 1096 | |
1c26372e AKM |
1097 | static const struct spi_controller_mem_ops zynqmp_qspi_mem_ops = { |
1098 | .exec_op = zynqmp_qspi_exec_op, | |
1099 | }; | |
1100 | ||
dfe11a11 | 1101 | /** |
91af6eb0 | 1102 | * zynqmp_qspi_probe - Probe method for the QSPI driver |
dfe11a11 RW |
1103 | * @pdev: Pointer to the platform_device structure |
1104 | * | |
1105 | * This function initializes the driver data structures and the hardware. | |
1106 | * | |
1107 | * Return: 0 on success; error value otherwise | |
1108 | */ | |
1109 | static int zynqmp_qspi_probe(struct platform_device *pdev) | |
1110 | { | |
1111 | int ret = 0; | |
1c26372e | 1112 | struct spi_controller *ctlr; |
dfe11a11 | 1113 | struct zynqmp_qspi *xqspi; |
dfe11a11 | 1114 | struct device *dev = &pdev->dev; |
1c26372e | 1115 | struct device_node *np = dev->of_node; |
dfe11a11 | 1116 | |
1c26372e AKM |
1117 | ctlr = spi_alloc_master(&pdev->dev, sizeof(*xqspi)); |
1118 | if (!ctlr) | |
dfe11a11 RW |
1119 | return -ENOMEM; |
1120 | ||
1c26372e AKM |
1121 | xqspi = spi_controller_get_devdata(ctlr); |
1122 | xqspi->dev = dev; | |
1123 | platform_set_drvdata(pdev, xqspi); | |
dfe11a11 | 1124 | |
214d1edb | 1125 | xqspi->regs = devm_platform_ioremap_resource(pdev, 0); |
dfe11a11 RW |
1126 | if (IS_ERR(xqspi->regs)) { |
1127 | ret = PTR_ERR(xqspi->regs); | |
1128 | goto remove_master; | |
1129 | } | |
1130 | ||
dfe11a11 RW |
1131 | xqspi->pclk = devm_clk_get(&pdev->dev, "pclk"); |
1132 | if (IS_ERR(xqspi->pclk)) { | |
1133 | dev_err(dev, "pclk clock not found.\n"); | |
1134 | ret = PTR_ERR(xqspi->pclk); | |
1135 | goto remove_master; | |
1136 | } | |
1137 | ||
1c26372e | 1138 | init_completion(&xqspi->data_completion); |
dfe11a11 RW |
1139 | |
1140 | xqspi->refclk = devm_clk_get(&pdev->dev, "ref_clk"); | |
1141 | if (IS_ERR(xqspi->refclk)) { | |
1142 | dev_err(dev, "ref_clk clock not found.\n"); | |
1143 | ret = PTR_ERR(xqspi->refclk); | |
1144 | goto clk_dis_pclk; | |
1145 | } | |
1146 | ||
1c26372e AKM |
1147 | ret = clk_prepare_enable(xqspi->pclk); |
1148 | if (ret) { | |
1149 | dev_err(dev, "Unable to enable APB clock.\n"); | |
1150 | goto remove_master; | |
1151 | } | |
1152 | ||
dfe11a11 RW |
1153 | ret = clk_prepare_enable(xqspi->refclk); |
1154 | if (ret) { | |
1155 | dev_err(dev, "Unable to enable device clock.\n"); | |
1156 | goto clk_dis_pclk; | |
1157 | } | |
1158 | ||
9e3a0003 NSR |
1159 | pm_runtime_use_autosuspend(&pdev->dev); |
1160 | pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); | |
1161 | pm_runtime_set_active(&pdev->dev); | |
1162 | pm_runtime_enable(&pdev->dev); | |
dfe11a11 RW |
1163 | /* QSPI controller initializations */ |
1164 | zynqmp_qspi_init_hw(xqspi); | |
1165 | ||
9e3a0003 NSR |
1166 | pm_runtime_mark_last_busy(&pdev->dev); |
1167 | pm_runtime_put_autosuspend(&pdev->dev); | |
dfe11a11 RW |
1168 | xqspi->irq = platform_get_irq(pdev, 0); |
1169 | if (xqspi->irq <= 0) { | |
1170 | ret = -ENXIO; | |
dfe11a11 RW |
1171 | goto clk_dis_all; |
1172 | } | |
1173 | ret = devm_request_irq(&pdev->dev, xqspi->irq, zynqmp_qspi_irq, | |
1c26372e | 1174 | 0, pdev->name, xqspi); |
dfe11a11 RW |
1175 | if (ret != 0) { |
1176 | ret = -ENXIO; | |
1177 | dev_err(dev, "request_irq failed\n"); | |
1178 | goto clk_dis_all; | |
1179 | } | |
1180 | ||
1c26372e AKM |
1181 | ctlr->bits_per_word_mask = SPI_BPW_MASK(8); |
1182 | ctlr->num_chipselect = GQSPI_DEFAULT_NUM_CS; | |
1183 | ctlr->mem_ops = &zynqmp_qspi_mem_ops; | |
1184 | ctlr->setup = zynqmp_qspi_setup_op; | |
1185 | ctlr->max_speed_hz = clk_get_rate(xqspi->refclk) / 2; | |
1186 | ctlr->bits_per_word_mask = SPI_BPW_MASK(8); | |
1187 | ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD | | |
dfe11a11 | 1188 | SPI_TX_DUAL | SPI_TX_QUAD; |
1c26372e | 1189 | ctlr->dev.of_node = np; |
dfe11a11 | 1190 | |
1c26372e AKM |
1191 | ret = devm_spi_register_controller(&pdev->dev, ctlr); |
1192 | if (ret) { | |
1193 | dev_err(&pdev->dev, "spi_register_controller failed\n"); | |
dfe11a11 | 1194 | goto clk_dis_all; |
1c26372e | 1195 | } |
dfe11a11 RW |
1196 | |
1197 | return 0; | |
1198 | ||
1199 | clk_dis_all: | |
9e3a0003 NSR |
1200 | pm_runtime_set_suspended(&pdev->dev); |
1201 | pm_runtime_disable(&pdev->dev); | |
dfe11a11 RW |
1202 | clk_disable_unprepare(xqspi->refclk); |
1203 | clk_dis_pclk: | |
1204 | clk_disable_unprepare(xqspi->pclk); | |
1205 | remove_master: | |
1c26372e | 1206 | spi_controller_put(ctlr); |
dfe11a11 RW |
1207 | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | /** | |
91af6eb0 | 1212 | * zynqmp_qspi_remove - Remove method for the QSPI driver |
dfe11a11 RW |
1213 | * @pdev: Pointer to the platform_device structure |
1214 | * | |
1215 | * This function is called if a device is physically removed from the system or | |
1216 | * if the driver module is being unloaded. It frees all resources allocated to | |
1217 | * the device. | |
1218 | * | |
1219 | * Return: 0 Always | |
1220 | */ | |
1221 | static int zynqmp_qspi_remove(struct platform_device *pdev) | |
1222 | { | |
1c26372e | 1223 | struct zynqmp_qspi *xqspi = platform_get_drvdata(pdev); |
dfe11a11 RW |
1224 | |
1225 | zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); | |
1226 | clk_disable_unprepare(xqspi->refclk); | |
1227 | clk_disable_unprepare(xqspi->pclk); | |
9e3a0003 NSR |
1228 | pm_runtime_set_suspended(&pdev->dev); |
1229 | pm_runtime_disable(&pdev->dev); | |
dfe11a11 | 1230 | |
dfe11a11 RW |
1231 | return 0; |
1232 | } | |
1233 | ||
1234 | static const struct of_device_id zynqmp_qspi_of_match[] = { | |
1235 | { .compatible = "xlnx,zynqmp-qspi-1.0", }, | |
1236 | { /* End of table */ } | |
1237 | }; | |
1238 | ||
1239 | MODULE_DEVICE_TABLE(of, zynqmp_qspi_of_match); | |
1240 | ||
1241 | static struct platform_driver zynqmp_qspi_driver = { | |
1242 | .probe = zynqmp_qspi_probe, | |
1243 | .remove = zynqmp_qspi_remove, | |
1244 | .driver = { | |
1245 | .name = "zynqmp-qspi", | |
1246 | .of_match_table = zynqmp_qspi_of_match, | |
1247 | .pm = &zynqmp_qspi_dev_pm_ops, | |
1248 | }, | |
1249 | }; | |
1250 | ||
1251 | module_platform_driver(zynqmp_qspi_driver); | |
1252 | ||
1253 | MODULE_AUTHOR("Xilinx, Inc."); | |
1254 | MODULE_DESCRIPTION("Xilinx Zynqmp QSPI driver"); | |
1255 | MODULE_LICENSE("GPL"); |