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754ce4f2 HS |
1 | /* |
2 | * Driver for Atmel AT32 and AT91 SPI Controllers | |
3 | * | |
4 | * Copyright (C) 2006 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
754ce4f2 HS |
12 | #include <linux/clk.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/dma-mapping.h> | |
1ccc404a | 17 | #include <linux/dmaengine.h> |
754ce4f2 HS |
18 | #include <linux/err.h> |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/spi/spi.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
bcd2360c | 22 | #include <linux/platform_data/atmel.h> |
1ccc404a | 23 | #include <linux/platform_data/dma-atmel.h> |
850a5b67 | 24 | #include <linux/of.h> |
754ce4f2 | 25 | |
d4820b74 WY |
26 | #include <linux/io.h> |
27 | #include <linux/gpio.h> | |
5bdfd491 | 28 | #include <linux/pinctrl/consumer.h> |
ce0c4caf | 29 | #include <linux/pm_runtime.h> |
bb2d1c36 | 30 | |
ca632f55 GL |
31 | /* SPI register offsets */ |
32 | #define SPI_CR 0x0000 | |
33 | #define SPI_MR 0x0004 | |
34 | #define SPI_RDR 0x0008 | |
35 | #define SPI_TDR 0x000c | |
36 | #define SPI_SR 0x0010 | |
37 | #define SPI_IER 0x0014 | |
38 | #define SPI_IDR 0x0018 | |
39 | #define SPI_IMR 0x001c | |
40 | #define SPI_CSR0 0x0030 | |
41 | #define SPI_CSR1 0x0034 | |
42 | #define SPI_CSR2 0x0038 | |
43 | #define SPI_CSR3 0x003c | |
11f2764f CP |
44 | #define SPI_FMR 0x0040 |
45 | #define SPI_FLR 0x0044 | |
d4820b74 | 46 | #define SPI_VERSION 0x00fc |
ca632f55 GL |
47 | #define SPI_RPR 0x0100 |
48 | #define SPI_RCR 0x0104 | |
49 | #define SPI_TPR 0x0108 | |
50 | #define SPI_TCR 0x010c | |
51 | #define SPI_RNPR 0x0110 | |
52 | #define SPI_RNCR 0x0114 | |
53 | #define SPI_TNPR 0x0118 | |
54 | #define SPI_TNCR 0x011c | |
55 | #define SPI_PTCR 0x0120 | |
56 | #define SPI_PTSR 0x0124 | |
57 | ||
58 | /* Bitfields in CR */ | |
59 | #define SPI_SPIEN_OFFSET 0 | |
60 | #define SPI_SPIEN_SIZE 1 | |
61 | #define SPI_SPIDIS_OFFSET 1 | |
62 | #define SPI_SPIDIS_SIZE 1 | |
63 | #define SPI_SWRST_OFFSET 7 | |
64 | #define SPI_SWRST_SIZE 1 | |
65 | #define SPI_LASTXFER_OFFSET 24 | |
66 | #define SPI_LASTXFER_SIZE 1 | |
11f2764f CP |
67 | #define SPI_TXFCLR_OFFSET 16 |
68 | #define SPI_TXFCLR_SIZE 1 | |
69 | #define SPI_RXFCLR_OFFSET 17 | |
70 | #define SPI_RXFCLR_SIZE 1 | |
71 | #define SPI_FIFOEN_OFFSET 30 | |
72 | #define SPI_FIFOEN_SIZE 1 | |
73 | #define SPI_FIFODIS_OFFSET 31 | |
74 | #define SPI_FIFODIS_SIZE 1 | |
ca632f55 GL |
75 | |
76 | /* Bitfields in MR */ | |
77 | #define SPI_MSTR_OFFSET 0 | |
78 | #define SPI_MSTR_SIZE 1 | |
79 | #define SPI_PS_OFFSET 1 | |
80 | #define SPI_PS_SIZE 1 | |
81 | #define SPI_PCSDEC_OFFSET 2 | |
82 | #define SPI_PCSDEC_SIZE 1 | |
83 | #define SPI_FDIV_OFFSET 3 | |
84 | #define SPI_FDIV_SIZE 1 | |
85 | #define SPI_MODFDIS_OFFSET 4 | |
86 | #define SPI_MODFDIS_SIZE 1 | |
d4820b74 WY |
87 | #define SPI_WDRBT_OFFSET 5 |
88 | #define SPI_WDRBT_SIZE 1 | |
ca632f55 GL |
89 | #define SPI_LLB_OFFSET 7 |
90 | #define SPI_LLB_SIZE 1 | |
91 | #define SPI_PCS_OFFSET 16 | |
92 | #define SPI_PCS_SIZE 4 | |
93 | #define SPI_DLYBCS_OFFSET 24 | |
94 | #define SPI_DLYBCS_SIZE 8 | |
95 | ||
96 | /* Bitfields in RDR */ | |
97 | #define SPI_RD_OFFSET 0 | |
98 | #define SPI_RD_SIZE 16 | |
99 | ||
100 | /* Bitfields in TDR */ | |
101 | #define SPI_TD_OFFSET 0 | |
102 | #define SPI_TD_SIZE 16 | |
103 | ||
104 | /* Bitfields in SR */ | |
105 | #define SPI_RDRF_OFFSET 0 | |
106 | #define SPI_RDRF_SIZE 1 | |
107 | #define SPI_TDRE_OFFSET 1 | |
108 | #define SPI_TDRE_SIZE 1 | |
109 | #define SPI_MODF_OFFSET 2 | |
110 | #define SPI_MODF_SIZE 1 | |
111 | #define SPI_OVRES_OFFSET 3 | |
112 | #define SPI_OVRES_SIZE 1 | |
113 | #define SPI_ENDRX_OFFSET 4 | |
114 | #define SPI_ENDRX_SIZE 1 | |
115 | #define SPI_ENDTX_OFFSET 5 | |
116 | #define SPI_ENDTX_SIZE 1 | |
117 | #define SPI_RXBUFF_OFFSET 6 | |
118 | #define SPI_RXBUFF_SIZE 1 | |
119 | #define SPI_TXBUFE_OFFSET 7 | |
120 | #define SPI_TXBUFE_SIZE 1 | |
121 | #define SPI_NSSR_OFFSET 8 | |
122 | #define SPI_NSSR_SIZE 1 | |
123 | #define SPI_TXEMPTY_OFFSET 9 | |
124 | #define SPI_TXEMPTY_SIZE 1 | |
125 | #define SPI_SPIENS_OFFSET 16 | |
126 | #define SPI_SPIENS_SIZE 1 | |
11f2764f CP |
127 | #define SPI_TXFEF_OFFSET 24 |
128 | #define SPI_TXFEF_SIZE 1 | |
129 | #define SPI_TXFFF_OFFSET 25 | |
130 | #define SPI_TXFFF_SIZE 1 | |
131 | #define SPI_TXFTHF_OFFSET 26 | |
132 | #define SPI_TXFTHF_SIZE 1 | |
133 | #define SPI_RXFEF_OFFSET 27 | |
134 | #define SPI_RXFEF_SIZE 1 | |
135 | #define SPI_RXFFF_OFFSET 28 | |
136 | #define SPI_RXFFF_SIZE 1 | |
137 | #define SPI_RXFTHF_OFFSET 29 | |
138 | #define SPI_RXFTHF_SIZE 1 | |
139 | #define SPI_TXFPTEF_OFFSET 30 | |
140 | #define SPI_TXFPTEF_SIZE 1 | |
141 | #define SPI_RXFPTEF_OFFSET 31 | |
142 | #define SPI_RXFPTEF_SIZE 1 | |
ca632f55 GL |
143 | |
144 | /* Bitfields in CSR0 */ | |
145 | #define SPI_CPOL_OFFSET 0 | |
146 | #define SPI_CPOL_SIZE 1 | |
147 | #define SPI_NCPHA_OFFSET 1 | |
148 | #define SPI_NCPHA_SIZE 1 | |
149 | #define SPI_CSAAT_OFFSET 3 | |
150 | #define SPI_CSAAT_SIZE 1 | |
151 | #define SPI_BITS_OFFSET 4 | |
152 | #define SPI_BITS_SIZE 4 | |
153 | #define SPI_SCBR_OFFSET 8 | |
154 | #define SPI_SCBR_SIZE 8 | |
155 | #define SPI_DLYBS_OFFSET 16 | |
156 | #define SPI_DLYBS_SIZE 8 | |
157 | #define SPI_DLYBCT_OFFSET 24 | |
158 | #define SPI_DLYBCT_SIZE 8 | |
159 | ||
160 | /* Bitfields in RCR */ | |
161 | #define SPI_RXCTR_OFFSET 0 | |
162 | #define SPI_RXCTR_SIZE 16 | |
163 | ||
164 | /* Bitfields in TCR */ | |
165 | #define SPI_TXCTR_OFFSET 0 | |
166 | #define SPI_TXCTR_SIZE 16 | |
167 | ||
168 | /* Bitfields in RNCR */ | |
169 | #define SPI_RXNCR_OFFSET 0 | |
170 | #define SPI_RXNCR_SIZE 16 | |
171 | ||
172 | /* Bitfields in TNCR */ | |
173 | #define SPI_TXNCR_OFFSET 0 | |
174 | #define SPI_TXNCR_SIZE 16 | |
175 | ||
176 | /* Bitfields in PTCR */ | |
177 | #define SPI_RXTEN_OFFSET 0 | |
178 | #define SPI_RXTEN_SIZE 1 | |
179 | #define SPI_RXTDIS_OFFSET 1 | |
180 | #define SPI_RXTDIS_SIZE 1 | |
181 | #define SPI_TXTEN_OFFSET 8 | |
182 | #define SPI_TXTEN_SIZE 1 | |
183 | #define SPI_TXTDIS_OFFSET 9 | |
184 | #define SPI_TXTDIS_SIZE 1 | |
185 | ||
11f2764f CP |
186 | /* Bitfields in FMR */ |
187 | #define SPI_TXRDYM_OFFSET 0 | |
188 | #define SPI_TXRDYM_SIZE 2 | |
189 | #define SPI_RXRDYM_OFFSET 4 | |
190 | #define SPI_RXRDYM_SIZE 2 | |
191 | #define SPI_TXFTHRES_OFFSET 16 | |
192 | #define SPI_TXFTHRES_SIZE 6 | |
193 | #define SPI_RXFTHRES_OFFSET 24 | |
194 | #define SPI_RXFTHRES_SIZE 6 | |
195 | ||
196 | /* Bitfields in FLR */ | |
197 | #define SPI_TXFL_OFFSET 0 | |
198 | #define SPI_TXFL_SIZE 6 | |
199 | #define SPI_RXFL_OFFSET 16 | |
200 | #define SPI_RXFL_SIZE 6 | |
201 | ||
ca632f55 GL |
202 | /* Constants for BITS */ |
203 | #define SPI_BITS_8_BPT 0 | |
204 | #define SPI_BITS_9_BPT 1 | |
205 | #define SPI_BITS_10_BPT 2 | |
206 | #define SPI_BITS_11_BPT 3 | |
207 | #define SPI_BITS_12_BPT 4 | |
208 | #define SPI_BITS_13_BPT 5 | |
209 | #define SPI_BITS_14_BPT 6 | |
210 | #define SPI_BITS_15_BPT 7 | |
211 | #define SPI_BITS_16_BPT 8 | |
11f2764f CP |
212 | #define SPI_ONE_DATA 0 |
213 | #define SPI_TWO_DATA 1 | |
214 | #define SPI_FOUR_DATA 2 | |
ca632f55 GL |
215 | |
216 | /* Bit manipulation macros */ | |
217 | #define SPI_BIT(name) \ | |
218 | (1 << SPI_##name##_OFFSET) | |
a536d765 | 219 | #define SPI_BF(name, value) \ |
ca632f55 | 220 | (((value) & ((1 << SPI_##name##_SIZE) - 1)) << SPI_##name##_OFFSET) |
a536d765 | 221 | #define SPI_BFEXT(name, value) \ |
ca632f55 | 222 | (((value) >> SPI_##name##_OFFSET) & ((1 << SPI_##name##_SIZE) - 1)) |
a536d765 SK |
223 | #define SPI_BFINS(name, value, old) \ |
224 | (((old) & ~(((1 << SPI_##name##_SIZE) - 1) << SPI_##name##_OFFSET)) \ | |
225 | | SPI_BF(name, value)) | |
ca632f55 GL |
226 | |
227 | /* Register access macros */ | |
ea467326 | 228 | #ifdef CONFIG_AVR32 |
a536d765 | 229 | #define spi_readl(port, reg) \ |
ca632f55 | 230 | __raw_readl((port)->regs + SPI_##reg) |
a536d765 | 231 | #define spi_writel(port, reg, value) \ |
ca632f55 | 232 | __raw_writel((value), (port)->regs + SPI_##reg) |
11f2764f CP |
233 | |
234 | #define spi_readw(port, reg) \ | |
235 | __raw_readw((port)->regs + SPI_##reg) | |
236 | #define spi_writew(port, reg, value) \ | |
237 | __raw_writew((value), (port)->regs + SPI_##reg) | |
238 | ||
239 | #define spi_readb(port, reg) \ | |
240 | __raw_readb((port)->regs + SPI_##reg) | |
241 | #define spi_writeb(port, reg, value) \ | |
242 | __raw_writeb((value), (port)->regs + SPI_##reg) | |
ea467326 BD |
243 | #else |
244 | #define spi_readl(port, reg) \ | |
245 | readl_relaxed((port)->regs + SPI_##reg) | |
246 | #define spi_writel(port, reg, value) \ | |
247 | writel_relaxed((value), (port)->regs + SPI_##reg) | |
11f2764f CP |
248 | |
249 | #define spi_readw(port, reg) \ | |
250 | readw_relaxed((port)->regs + SPI_##reg) | |
251 | #define spi_writew(port, reg, value) \ | |
252 | writew_relaxed((value), (port)->regs + SPI_##reg) | |
253 | ||
254 | #define spi_readb(port, reg) \ | |
255 | readb_relaxed((port)->regs + SPI_##reg) | |
256 | #define spi_writeb(port, reg, value) \ | |
257 | writeb_relaxed((value), (port)->regs + SPI_##reg) | |
ea467326 | 258 | #endif |
1ccc404a NF |
259 | /* use PIO for small transfers, avoiding DMA setup/teardown overhead and |
260 | * cache operations; better heuristics consider wordsize and bitrate. | |
261 | */ | |
262 | #define DMA_MIN_BYTES 16 | |
263 | ||
8090d6d1 WY |
264 | #define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) |
265 | ||
ce0c4caf WY |
266 | #define AUTOSUSPEND_TIMEOUT 2000 |
267 | ||
1ccc404a NF |
268 | struct atmel_spi_dma { |
269 | struct dma_chan *chan_rx; | |
270 | struct dma_chan *chan_tx; | |
271 | struct scatterlist sgrx; | |
272 | struct scatterlist sgtx; | |
273 | struct dma_async_tx_descriptor *data_desc_rx; | |
274 | struct dma_async_tx_descriptor *data_desc_tx; | |
275 | ||
276 | struct at_dma_slave dma_slave; | |
277 | }; | |
278 | ||
d4820b74 WY |
279 | struct atmel_spi_caps { |
280 | bool is_spi2; | |
281 | bool has_wdrbt; | |
282 | bool has_dma_support; | |
283 | }; | |
754ce4f2 HS |
284 | |
285 | /* | |
286 | * The core SPI transfer engine just talks to a register bank to set up | |
287 | * DMA transfers; transfer queue progress is driven by IRQs. The clock | |
288 | * framework provides the base clock, subdivided for each spi_device. | |
754ce4f2 HS |
289 | */ |
290 | struct atmel_spi { | |
291 | spinlock_t lock; | |
8aad7924 | 292 | unsigned long flags; |
754ce4f2 | 293 | |
dfab30ee | 294 | phys_addr_t phybase; |
754ce4f2 HS |
295 | void __iomem *regs; |
296 | int irq; | |
297 | struct clk *clk; | |
298 | struct platform_device *pdev; | |
754ce4f2 | 299 | |
754ce4f2 | 300 | struct spi_transfer *current_transfer; |
0c3b9748 | 301 | int current_remaining_bytes; |
823cd045 | 302 | int done_status; |
754ce4f2 | 303 | |
8090d6d1 WY |
304 | struct completion xfer_completion; |
305 | ||
1ccc404a | 306 | /* scratch buffer */ |
754ce4f2 HS |
307 | void *buffer; |
308 | dma_addr_t buffer_dma; | |
d4820b74 WY |
309 | |
310 | struct atmel_spi_caps caps; | |
1ccc404a NF |
311 | |
312 | bool use_dma; | |
313 | bool use_pdc; | |
48203034 | 314 | bool use_cs_gpios; |
1ccc404a NF |
315 | /* dmaengine data */ |
316 | struct atmel_spi_dma dma; | |
8090d6d1 WY |
317 | |
318 | bool keep_cs; | |
319 | bool cs_active; | |
11f2764f CP |
320 | |
321 | u32 fifo_size; | |
754ce4f2 HS |
322 | }; |
323 | ||
5ee36c98 HS |
324 | /* Controller-specific per-slave state */ |
325 | struct atmel_spi_device { | |
326 | unsigned int npcs_pin; | |
327 | u32 csr; | |
328 | }; | |
329 | ||
754ce4f2 HS |
330 | #define BUFFER_SIZE PAGE_SIZE |
331 | #define INVALID_DMA_ADDRESS 0xffffffff | |
332 | ||
5bfa26ca HS |
333 | /* |
334 | * Version 2 of the SPI controller has | |
335 | * - CR.LASTXFER | |
336 | * - SPI_MR.DIV32 may become FDIV or must-be-zero (here: always zero) | |
337 | * - SPI_SR.TXEMPTY, SPI_SR.NSSR (and corresponding irqs) | |
338 | * - SPI_CSRx.CSAAT | |
339 | * - SPI_CSRx.SBCR allows faster clocking | |
5bfa26ca | 340 | */ |
d4820b74 | 341 | static bool atmel_spi_is_v2(struct atmel_spi *as) |
5bfa26ca | 342 | { |
d4820b74 | 343 | return as->caps.is_spi2; |
5bfa26ca HS |
344 | } |
345 | ||
754ce4f2 HS |
346 | /* |
347 | * Earlier SPI controllers (e.g. on at91rm9200) have a design bug whereby | |
348 | * they assume that spi slave device state will not change on deselect, so | |
defbd3b4 DB |
349 | * that automagic deselection is OK. ("NPCSx rises if no data is to be |
350 | * transmitted") Not so! Workaround uses nCSx pins as GPIOs; or newer | |
351 | * controllers have CSAAT and friends. | |
754ce4f2 | 352 | * |
defbd3b4 DB |
353 | * Since the CSAAT functionality is a bit weird on newer controllers as |
354 | * well, we use GPIO to control nCSx pins on all controllers, updating | |
355 | * MR.PCS to avoid confusing the controller. Using GPIOs also lets us | |
356 | * support active-high chipselects despite the controller's belief that | |
357 | * only active-low devices/systems exists. | |
358 | * | |
359 | * However, at91rm9200 has a second erratum whereby nCS0 doesn't work | |
360 | * right when driven with GPIO. ("Mode Fault does not allow more than one | |
361 | * Master on Chip Select 0.") No workaround exists for that ... so for | |
362 | * nCS0 on that chip, we (a) don't use the GPIO, (b) can't support CS_HIGH, | |
363 | * and (c) will trigger that first erratum in some cases. | |
754ce4f2 HS |
364 | */ |
365 | ||
defbd3b4 | 366 | static void cs_activate(struct atmel_spi *as, struct spi_device *spi) |
754ce4f2 | 367 | { |
5ee36c98 | 368 | struct atmel_spi_device *asd = spi->controller_state; |
754ce4f2 | 369 | unsigned active = spi->mode & SPI_CS_HIGH; |
defbd3b4 DB |
370 | u32 mr; |
371 | ||
d4820b74 | 372 | if (atmel_spi_is_v2(as)) { |
97ed465b WY |
373 | spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr); |
374 | /* For the low SPI version, there is a issue that PDC transfer | |
375 | * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS | |
5ee36c98 HS |
376 | */ |
377 | spi_writel(as, CSR0, asd->csr); | |
d4820b74 | 378 | if (as->caps.has_wdrbt) { |
97ed465b WY |
379 | spi_writel(as, MR, |
380 | SPI_BF(PCS, ~(0x01 << spi->chip_select)) | |
381 | | SPI_BIT(WDRBT) | |
382 | | SPI_BIT(MODFDIS) | |
383 | | SPI_BIT(MSTR)); | |
d4820b74 | 384 | } else { |
97ed465b WY |
385 | spi_writel(as, MR, |
386 | SPI_BF(PCS, ~(0x01 << spi->chip_select)) | |
387 | | SPI_BIT(MODFDIS) | |
388 | | SPI_BIT(MSTR)); | |
d4820b74 | 389 | } |
1ccc404a | 390 | |
5ee36c98 | 391 | mr = spi_readl(as, MR); |
48203034 CP |
392 | if (as->use_cs_gpios) |
393 | gpio_set_value(asd->npcs_pin, active); | |
5ee36c98 HS |
394 | } else { |
395 | u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0; | |
396 | int i; | |
397 | u32 csr; | |
398 | ||
399 | /* Make sure clock polarity is correct */ | |
400 | for (i = 0; i < spi->master->num_chipselect; i++) { | |
401 | csr = spi_readl(as, CSR0 + 4 * i); | |
402 | if ((csr ^ cpol) & SPI_BIT(CPOL)) | |
403 | spi_writel(as, CSR0 + 4 * i, | |
404 | csr ^ SPI_BIT(CPOL)); | |
405 | } | |
406 | ||
407 | mr = spi_readl(as, MR); | |
408 | mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr); | |
48203034 | 409 | if (as->use_cs_gpios && spi->chip_select != 0) |
5ee36c98 HS |
410 | gpio_set_value(asd->npcs_pin, active); |
411 | spi_writel(as, MR, mr); | |
412 | } | |
defbd3b4 DB |
413 | |
414 | dev_dbg(&spi->dev, "activate %u%s, mr %08x\n", | |
5ee36c98 | 415 | asd->npcs_pin, active ? " (high)" : "", |
defbd3b4 | 416 | mr); |
754ce4f2 HS |
417 | } |
418 | ||
defbd3b4 | 419 | static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi) |
754ce4f2 | 420 | { |
5ee36c98 | 421 | struct atmel_spi_device *asd = spi->controller_state; |
754ce4f2 | 422 | unsigned active = spi->mode & SPI_CS_HIGH; |
defbd3b4 DB |
423 | u32 mr; |
424 | ||
425 | /* only deactivate *this* device; sometimes transfers to | |
426 | * another device may be active when this routine is called. | |
427 | */ | |
428 | mr = spi_readl(as, MR); | |
429 | if (~SPI_BFEXT(PCS, mr) & (1 << spi->chip_select)) { | |
430 | mr = SPI_BFINS(PCS, 0xf, mr); | |
431 | spi_writel(as, MR, mr); | |
432 | } | |
754ce4f2 | 433 | |
defbd3b4 | 434 | dev_dbg(&spi->dev, "DEactivate %u%s, mr %08x\n", |
5ee36c98 | 435 | asd->npcs_pin, active ? " (low)" : "", |
defbd3b4 DB |
436 | mr); |
437 | ||
48203034 CP |
438 | if (!as->use_cs_gpios) |
439 | spi_writel(as, CR, SPI_BIT(LASTXFER)); | |
440 | else if (atmel_spi_is_v2(as) || spi->chip_select != 0) | |
5ee36c98 | 441 | gpio_set_value(asd->npcs_pin, !active); |
754ce4f2 HS |
442 | } |
443 | ||
6c07ef29 | 444 | static void atmel_spi_lock(struct atmel_spi *as) __acquires(&as->lock) |
8aad7924 NF |
445 | { |
446 | spin_lock_irqsave(&as->lock, as->flags); | |
447 | } | |
448 | ||
6c07ef29 | 449 | static void atmel_spi_unlock(struct atmel_spi *as) __releases(&as->lock) |
8aad7924 NF |
450 | { |
451 | spin_unlock_irqrestore(&as->lock, as->flags); | |
452 | } | |
453 | ||
1ccc404a NF |
454 | static inline bool atmel_spi_use_dma(struct atmel_spi *as, |
455 | struct spi_transfer *xfer) | |
456 | { | |
457 | return as->use_dma && xfer->len >= DMA_MIN_BYTES; | |
458 | } | |
459 | ||
1ccc404a NF |
460 | static int atmel_spi_dma_slave_config(struct atmel_spi *as, |
461 | struct dma_slave_config *slave_config, | |
462 | u8 bits_per_word) | |
463 | { | |
464 | int err = 0; | |
465 | ||
466 | if (bits_per_word > 8) { | |
467 | slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
468 | slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
469 | } else { | |
470 | slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
471 | slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
472 | } | |
473 | ||
474 | slave_config->dst_addr = (dma_addr_t)as->phybase + SPI_TDR; | |
475 | slave_config->src_addr = (dma_addr_t)as->phybase + SPI_RDR; | |
476 | slave_config->src_maxburst = 1; | |
477 | slave_config->dst_maxburst = 1; | |
478 | slave_config->device_fc = false; | |
479 | ||
11f2764f CP |
480 | /* |
481 | * This driver uses fixed peripheral select mode (PS bit set to '0' in | |
482 | * the Mode Register). | |
483 | * So according to the datasheet, when FIFOs are available (and | |
484 | * enabled), the Transmit FIFO operates in Multiple Data Mode. | |
485 | * In this mode, up to 2 data, not 4, can be written into the Transmit | |
486 | * Data Register in a single access. | |
487 | * However, the first data has to be written into the lowest 16 bits and | |
488 | * the second data into the highest 16 bits of the Transmit | |
489 | * Data Register. For 8bit data (the most frequent case), it would | |
490 | * require to rework tx_buf so each data would actualy fit 16 bits. | |
491 | * So we'd rather write only one data at the time. Hence the transmit | |
492 | * path works the same whether FIFOs are available (and enabled) or not. | |
493 | */ | |
1ccc404a NF |
494 | slave_config->direction = DMA_MEM_TO_DEV; |
495 | if (dmaengine_slave_config(as->dma.chan_tx, slave_config)) { | |
496 | dev_err(&as->pdev->dev, | |
497 | "failed to configure tx dma channel\n"); | |
498 | err = -EINVAL; | |
499 | } | |
500 | ||
11f2764f CP |
501 | /* |
502 | * This driver configures the spi controller for master mode (MSTR bit | |
503 | * set to '1' in the Mode Register). | |
504 | * So according to the datasheet, when FIFOs are available (and | |
505 | * enabled), the Receive FIFO operates in Single Data Mode. | |
506 | * So the receive path works the same whether FIFOs are available (and | |
507 | * enabled) or not. | |
508 | */ | |
1ccc404a NF |
509 | slave_config->direction = DMA_DEV_TO_MEM; |
510 | if (dmaengine_slave_config(as->dma.chan_rx, slave_config)) { | |
511 | dev_err(&as->pdev->dev, | |
512 | "failed to configure rx dma channel\n"); | |
513 | err = -EINVAL; | |
514 | } | |
515 | ||
516 | return err; | |
517 | } | |
518 | ||
1ccc404a NF |
519 | static int atmel_spi_configure_dma(struct atmel_spi *as) |
520 | { | |
1ccc404a | 521 | struct dma_slave_config slave_config; |
2f767a9f | 522 | struct device *dev = &as->pdev->dev; |
1ccc404a NF |
523 | int err; |
524 | ||
2f767a9f RG |
525 | dma_cap_mask_t mask; |
526 | dma_cap_zero(mask); | |
527 | dma_cap_set(DMA_SLAVE, mask); | |
1ccc404a | 528 | |
5e9af37e LD |
529 | as->dma.chan_tx = dma_request_slave_channel_reason(dev, "tx"); |
530 | if (IS_ERR(as->dma.chan_tx)) { | |
531 | err = PTR_ERR(as->dma.chan_tx); | |
532 | if (err == -EPROBE_DEFER) { | |
533 | dev_warn(dev, "no DMA channel available at the moment\n"); | |
534 | return err; | |
535 | } | |
2f767a9f RG |
536 | dev_err(dev, |
537 | "DMA TX channel not available, SPI unable to use DMA\n"); | |
538 | err = -EBUSY; | |
539 | goto error; | |
1ccc404a | 540 | } |
2f767a9f | 541 | |
5e9af37e LD |
542 | /* |
543 | * No reason to check EPROBE_DEFER here since we have already requested | |
544 | * tx channel. If it fails here, it's for another reason. | |
545 | */ | |
7758e390 | 546 | as->dma.chan_rx = dma_request_slave_channel(dev, "rx"); |
2f767a9f RG |
547 | |
548 | if (!as->dma.chan_rx) { | |
549 | dev_err(dev, | |
550 | "DMA RX channel not available, SPI unable to use DMA\n"); | |
1ccc404a NF |
551 | err = -EBUSY; |
552 | goto error; | |
553 | } | |
554 | ||
555 | err = atmel_spi_dma_slave_config(as, &slave_config, 8); | |
556 | if (err) | |
557 | goto error; | |
558 | ||
559 | dev_info(&as->pdev->dev, | |
560 | "Using %s (tx) and %s (rx) for DMA transfers\n", | |
561 | dma_chan_name(as->dma.chan_tx), | |
562 | dma_chan_name(as->dma.chan_rx)); | |
563 | return 0; | |
564 | error: | |
565 | if (as->dma.chan_rx) | |
566 | dma_release_channel(as->dma.chan_rx); | |
5e9af37e | 567 | if (!IS_ERR(as->dma.chan_tx)) |
1ccc404a NF |
568 | dma_release_channel(as->dma.chan_tx); |
569 | return err; | |
570 | } | |
571 | ||
572 | static void atmel_spi_stop_dma(struct atmel_spi *as) | |
573 | { | |
574 | if (as->dma.chan_rx) | |
5398ad68 | 575 | dmaengine_terminate_all(as->dma.chan_rx); |
1ccc404a | 576 | if (as->dma.chan_tx) |
5398ad68 | 577 | dmaengine_terminate_all(as->dma.chan_tx); |
1ccc404a NF |
578 | } |
579 | ||
580 | static void atmel_spi_release_dma(struct atmel_spi *as) | |
581 | { | |
582 | if (as->dma.chan_rx) | |
583 | dma_release_channel(as->dma.chan_rx); | |
584 | if (as->dma.chan_tx) | |
585 | dma_release_channel(as->dma.chan_tx); | |
586 | } | |
587 | ||
588 | /* This function is called by the DMA driver from tasklet context */ | |
589 | static void dma_callback(void *data) | |
590 | { | |
591 | struct spi_master *master = data; | |
592 | struct atmel_spi *as = spi_master_get_devdata(master); | |
593 | ||
8090d6d1 | 594 | complete(&as->xfer_completion); |
1ccc404a NF |
595 | } |
596 | ||
597 | /* | |
11f2764f | 598 | * Next transfer using PIO without FIFO. |
1ccc404a | 599 | */ |
11f2764f CP |
600 | static void atmel_spi_next_xfer_single(struct spi_master *master, |
601 | struct spi_transfer *xfer) | |
1ccc404a NF |
602 | { |
603 | struct atmel_spi *as = spi_master_get_devdata(master); | |
8090d6d1 | 604 | unsigned long xfer_pos = xfer->len - as->current_remaining_bytes; |
1ccc404a NF |
605 | |
606 | dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_pio\n"); | |
607 | ||
1ccc404a NF |
608 | /* Make sure data is not remaining in RDR */ |
609 | spi_readl(as, RDR); | |
610 | while (spi_readl(as, SR) & SPI_BIT(RDRF)) { | |
611 | spi_readl(as, RDR); | |
612 | cpu_relax(); | |
613 | } | |
614 | ||
8090d6d1 | 615 | if (xfer->tx_buf) { |
f557c98b | 616 | if (xfer->bits_per_word > 8) |
8090d6d1 | 617 | spi_writel(as, TDR, *(u16 *)(xfer->tx_buf + xfer_pos)); |
f557c98b | 618 | else |
8090d6d1 WY |
619 | spi_writel(as, TDR, *(u8 *)(xfer->tx_buf + xfer_pos)); |
620 | } else { | |
1ccc404a | 621 | spi_writel(as, TDR, 0); |
8090d6d1 | 622 | } |
1ccc404a NF |
623 | |
624 | dev_dbg(master->dev.parent, | |
f557c98b RG |
625 | " start pio xfer %p: len %u tx %p rx %p bitpw %d\n", |
626 | xfer, xfer->len, xfer->tx_buf, xfer->rx_buf, | |
627 | xfer->bits_per_word); | |
1ccc404a NF |
628 | |
629 | /* Enable relevant interrupts */ | |
630 | spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES)); | |
631 | } | |
632 | ||
11f2764f CP |
633 | /* |
634 | * Next transfer using PIO with FIFO. | |
635 | */ | |
636 | static void atmel_spi_next_xfer_fifo(struct spi_master *master, | |
637 | struct spi_transfer *xfer) | |
638 | { | |
639 | struct atmel_spi *as = spi_master_get_devdata(master); | |
640 | u32 current_remaining_data, num_data; | |
641 | u32 offset = xfer->len - as->current_remaining_bytes; | |
642 | const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset); | |
643 | const u8 *bytes = (const u8 *)((u8 *)xfer->tx_buf + offset); | |
644 | u16 td0, td1; | |
645 | u32 fifomr; | |
646 | ||
647 | dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n"); | |
648 | ||
649 | /* Compute the number of data to transfer in the current iteration */ | |
650 | current_remaining_data = ((xfer->bits_per_word > 8) ? | |
651 | ((u32)as->current_remaining_bytes >> 1) : | |
652 | (u32)as->current_remaining_bytes); | |
653 | num_data = min(current_remaining_data, as->fifo_size); | |
654 | ||
655 | /* Flush RX and TX FIFOs */ | |
656 | spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR)); | |
657 | while (spi_readl(as, FLR)) | |
658 | cpu_relax(); | |
659 | ||
660 | /* Set RX FIFO Threshold to the number of data to transfer */ | |
661 | fifomr = spi_readl(as, FMR); | |
662 | spi_writel(as, FMR, SPI_BFINS(RXFTHRES, num_data, fifomr)); | |
663 | ||
664 | /* Clear FIFO flags in the Status Register, especially RXFTHF */ | |
665 | (void)spi_readl(as, SR); | |
666 | ||
667 | /* Fill TX FIFO */ | |
668 | while (num_data >= 2) { | |
669 | if (xfer->tx_buf) { | |
670 | if (xfer->bits_per_word > 8) { | |
671 | td0 = *words++; | |
672 | td1 = *words++; | |
673 | } else { | |
674 | td0 = *bytes++; | |
675 | td1 = *bytes++; | |
676 | } | |
677 | } else { | |
678 | td0 = 0; | |
679 | td1 = 0; | |
680 | } | |
681 | ||
682 | spi_writel(as, TDR, (td1 << 16) | td0); | |
683 | num_data -= 2; | |
684 | } | |
685 | ||
686 | if (num_data) { | |
687 | if (xfer->tx_buf) { | |
688 | if (xfer->bits_per_word > 8) | |
689 | td0 = *words++; | |
690 | else | |
691 | td0 = *bytes++; | |
692 | } else { | |
693 | td0 = 0; | |
694 | } | |
695 | ||
696 | spi_writew(as, TDR, td0); | |
697 | num_data--; | |
698 | } | |
699 | ||
700 | dev_dbg(master->dev.parent, | |
701 | " start fifo xfer %p: len %u tx %p rx %p bitpw %d\n", | |
702 | xfer, xfer->len, xfer->tx_buf, xfer->rx_buf, | |
703 | xfer->bits_per_word); | |
704 | ||
705 | /* | |
706 | * Enable RX FIFO Threshold Flag interrupt to be notified about | |
707 | * transfer completion. | |
708 | */ | |
709 | spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES)); | |
710 | } | |
711 | ||
712 | /* | |
713 | * Next transfer using PIO. | |
714 | */ | |
715 | static void atmel_spi_next_xfer_pio(struct spi_master *master, | |
716 | struct spi_transfer *xfer) | |
717 | { | |
718 | struct atmel_spi *as = spi_master_get_devdata(master); | |
719 | ||
720 | if (as->fifo_size) | |
721 | atmel_spi_next_xfer_fifo(master, xfer); | |
722 | else | |
723 | atmel_spi_next_xfer_single(master, xfer); | |
724 | } | |
725 | ||
1ccc404a NF |
726 | /* |
727 | * Submit next transfer for DMA. | |
1ccc404a NF |
728 | */ |
729 | static int atmel_spi_next_xfer_dma_submit(struct spi_master *master, | |
730 | struct spi_transfer *xfer, | |
731 | u32 *plen) | |
732 | { | |
733 | struct atmel_spi *as = spi_master_get_devdata(master); | |
734 | struct dma_chan *rxchan = as->dma.chan_rx; | |
735 | struct dma_chan *txchan = as->dma.chan_tx; | |
736 | struct dma_async_tx_descriptor *rxdesc; | |
737 | struct dma_async_tx_descriptor *txdesc; | |
738 | struct dma_slave_config slave_config; | |
739 | dma_cookie_t cookie; | |
740 | u32 len = *plen; | |
741 | ||
742 | dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_dma_submit\n"); | |
743 | ||
744 | /* Check that the channels are available */ | |
745 | if (!rxchan || !txchan) | |
746 | return -ENODEV; | |
747 | ||
748 | /* release lock for DMA operations */ | |
749 | atmel_spi_unlock(as); | |
750 | ||
751 | /* prepare the RX dma transfer */ | |
752 | sg_init_table(&as->dma.sgrx, 1); | |
753 | if (xfer->rx_buf) { | |
754 | as->dma.sgrx.dma_address = xfer->rx_dma + xfer->len - *plen; | |
755 | } else { | |
756 | as->dma.sgrx.dma_address = as->buffer_dma; | |
757 | if (len > BUFFER_SIZE) | |
758 | len = BUFFER_SIZE; | |
759 | } | |
760 | ||
761 | /* prepare the TX dma transfer */ | |
762 | sg_init_table(&as->dma.sgtx, 1); | |
763 | if (xfer->tx_buf) { | |
764 | as->dma.sgtx.dma_address = xfer->tx_dma + xfer->len - *plen; | |
765 | } else { | |
766 | as->dma.sgtx.dma_address = as->buffer_dma; | |
767 | if (len > BUFFER_SIZE) | |
768 | len = BUFFER_SIZE; | |
769 | memset(as->buffer, 0, len); | |
770 | } | |
771 | ||
772 | sg_dma_len(&as->dma.sgtx) = len; | |
773 | sg_dma_len(&as->dma.sgrx) = len; | |
774 | ||
775 | *plen = len; | |
776 | ||
777 | if (atmel_spi_dma_slave_config(as, &slave_config, 8)) | |
778 | goto err_exit; | |
779 | ||
780 | /* Send both scatterlists */ | |
ef40eb39 GU |
781 | rxdesc = dmaengine_prep_slave_sg(rxchan, &as->dma.sgrx, 1, |
782 | DMA_FROM_DEVICE, | |
783 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1ccc404a NF |
784 | if (!rxdesc) |
785 | goto err_dma; | |
786 | ||
ef40eb39 GU |
787 | txdesc = dmaengine_prep_slave_sg(txchan, &as->dma.sgtx, 1, |
788 | DMA_TO_DEVICE, | |
789 | DMA_PREP_INTERRUPT | DMA_CTRL_ACK); | |
1ccc404a NF |
790 | if (!txdesc) |
791 | goto err_dma; | |
792 | ||
793 | dev_dbg(master->dev.parent, | |
2de024b7 EG |
794 | " start dma xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", |
795 | xfer, xfer->len, xfer->tx_buf, (unsigned long long)xfer->tx_dma, | |
796 | xfer->rx_buf, (unsigned long long)xfer->rx_dma); | |
1ccc404a NF |
797 | |
798 | /* Enable relevant interrupts */ | |
799 | spi_writel(as, IER, SPI_BIT(OVRES)); | |
800 | ||
801 | /* Put the callback on the RX transfer only, that should finish last */ | |
802 | rxdesc->callback = dma_callback; | |
803 | rxdesc->callback_param = master; | |
804 | ||
805 | /* Submit and fire RX and TX with TX last so we're ready to read! */ | |
806 | cookie = rxdesc->tx_submit(rxdesc); | |
807 | if (dma_submit_error(cookie)) | |
808 | goto err_dma; | |
809 | cookie = txdesc->tx_submit(txdesc); | |
810 | if (dma_submit_error(cookie)) | |
811 | goto err_dma; | |
812 | rxchan->device->device_issue_pending(rxchan); | |
813 | txchan->device->device_issue_pending(txchan); | |
814 | ||
815 | /* take back lock */ | |
816 | atmel_spi_lock(as); | |
817 | return 0; | |
818 | ||
819 | err_dma: | |
820 | spi_writel(as, IDR, SPI_BIT(OVRES)); | |
821 | atmel_spi_stop_dma(as); | |
822 | err_exit: | |
823 | atmel_spi_lock(as); | |
824 | return -ENOMEM; | |
825 | } | |
826 | ||
154443c7 SE |
827 | static void atmel_spi_next_xfer_data(struct spi_master *master, |
828 | struct spi_transfer *xfer, | |
829 | dma_addr_t *tx_dma, | |
830 | dma_addr_t *rx_dma, | |
831 | u32 *plen) | |
832 | { | |
833 | struct atmel_spi *as = spi_master_get_devdata(master); | |
834 | u32 len = *plen; | |
835 | ||
836 | /* use scratch buffer only when rx or tx data is unspecified */ | |
837 | if (xfer->rx_buf) | |
6aed4ee9 | 838 | *rx_dma = xfer->rx_dma + xfer->len - *plen; |
154443c7 SE |
839 | else { |
840 | *rx_dma = as->buffer_dma; | |
841 | if (len > BUFFER_SIZE) | |
842 | len = BUFFER_SIZE; | |
843 | } | |
1ccc404a | 844 | |
154443c7 | 845 | if (xfer->tx_buf) |
6aed4ee9 | 846 | *tx_dma = xfer->tx_dma + xfer->len - *plen; |
154443c7 SE |
847 | else { |
848 | *tx_dma = as->buffer_dma; | |
849 | if (len > BUFFER_SIZE) | |
850 | len = BUFFER_SIZE; | |
851 | memset(as->buffer, 0, len); | |
852 | dma_sync_single_for_device(&as->pdev->dev, | |
853 | as->buffer_dma, len, DMA_TO_DEVICE); | |
854 | } | |
855 | ||
856 | *plen = len; | |
857 | } | |
858 | ||
d3b72c7e RG |
859 | static int atmel_spi_set_xfer_speed(struct atmel_spi *as, |
860 | struct spi_device *spi, | |
861 | struct spi_transfer *xfer) | |
862 | { | |
863 | u32 scbr, csr; | |
864 | unsigned long bus_hz; | |
865 | ||
866 | /* v1 chips start out at half the peripheral bus speed. */ | |
867 | bus_hz = clk_get_rate(as->clk); | |
868 | if (!atmel_spi_is_v2(as)) | |
869 | bus_hz /= 2; | |
870 | ||
871 | /* | |
872 | * Calculate the lowest divider that satisfies the | |
873 | * constraint, assuming div32/fdiv/mbz == 0. | |
874 | */ | |
875 | if (xfer->speed_hz) | |
876 | scbr = DIV_ROUND_UP(bus_hz, xfer->speed_hz); | |
877 | else | |
878 | /* | |
879 | * This can happend if max_speed is null. | |
880 | * In this case, we set the lowest possible speed | |
881 | */ | |
882 | scbr = 0xff; | |
883 | ||
884 | /* | |
885 | * If the resulting divider doesn't fit into the | |
886 | * register bitfield, we can't satisfy the constraint. | |
887 | */ | |
888 | if (scbr >= (1 << SPI_SCBR_SIZE)) { | |
889 | dev_err(&spi->dev, | |
890 | "setup: %d Hz too slow, scbr %u; min %ld Hz\n", | |
891 | xfer->speed_hz, scbr, bus_hz/255); | |
892 | return -EINVAL; | |
893 | } | |
894 | if (scbr == 0) { | |
895 | dev_err(&spi->dev, | |
896 | "setup: %d Hz too high, scbr %u; max %ld Hz\n", | |
897 | xfer->speed_hz, scbr, bus_hz); | |
898 | return -EINVAL; | |
899 | } | |
900 | csr = spi_readl(as, CSR0 + 4 * spi->chip_select); | |
901 | csr = SPI_BFINS(SCBR, scbr, csr); | |
902 | spi_writel(as, CSR0 + 4 * spi->chip_select, csr); | |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
754ce4f2 | 907 | /* |
1ccc404a | 908 | * Submit next transfer for PDC. |
754ce4f2 HS |
909 | * lock is held, spi irq is blocked |
910 | */ | |
1ccc404a | 911 | static void atmel_spi_pdc_next_xfer(struct spi_master *master, |
8090d6d1 WY |
912 | struct spi_message *msg, |
913 | struct spi_transfer *xfer) | |
754ce4f2 HS |
914 | { |
915 | struct atmel_spi *as = spi_master_get_devdata(master); | |
8090d6d1 | 916 | u32 len; |
754ce4f2 HS |
917 | dma_addr_t tx_dma, rx_dma; |
918 | ||
8090d6d1 | 919 | spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); |
754ce4f2 | 920 | |
8090d6d1 WY |
921 | len = as->current_remaining_bytes; |
922 | atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len); | |
923 | as->current_remaining_bytes -= len; | |
754ce4f2 | 924 | |
8090d6d1 WY |
925 | spi_writel(as, RPR, rx_dma); |
926 | spi_writel(as, TPR, tx_dma); | |
754ce4f2 | 927 | |
8090d6d1 WY |
928 | if (msg->spi->bits_per_word > 8) |
929 | len >>= 1; | |
930 | spi_writel(as, RCR, len); | |
931 | spi_writel(as, TCR, len); | |
754ce4f2 | 932 | |
8090d6d1 WY |
933 | dev_dbg(&msg->spi->dev, |
934 | " start xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", | |
935 | xfer, xfer->len, xfer->tx_buf, | |
936 | (unsigned long long)xfer->tx_dma, xfer->rx_buf, | |
937 | (unsigned long long)xfer->rx_dma); | |
dc329442 | 938 | |
8090d6d1 WY |
939 | if (as->current_remaining_bytes) { |
940 | len = as->current_remaining_bytes; | |
154443c7 | 941 | atmel_spi_next_xfer_data(master, xfer, &tx_dma, &rx_dma, &len); |
8090d6d1 | 942 | as->current_remaining_bytes -= len; |
754ce4f2 | 943 | |
154443c7 SE |
944 | spi_writel(as, RNPR, rx_dma); |
945 | spi_writel(as, TNPR, tx_dma); | |
754ce4f2 | 946 | |
154443c7 SE |
947 | if (msg->spi->bits_per_word > 8) |
948 | len >>= 1; | |
949 | spi_writel(as, RNCR, len); | |
950 | spi_writel(as, TNCR, len); | |
8bacb219 HS |
951 | |
952 | dev_dbg(&msg->spi->dev, | |
2de024b7 EG |
953 | " next xfer %p: len %u tx %p/%08llx rx %p/%08llx\n", |
954 | xfer, xfer->len, xfer->tx_buf, | |
955 | (unsigned long long)xfer->tx_dma, xfer->rx_buf, | |
956 | (unsigned long long)xfer->rx_dma); | |
154443c7 SE |
957 | } |
958 | ||
76e1d14b | 959 | /* REVISIT: We're waiting for RXBUFF before we start the next |
754ce4f2 | 960 | * transfer because we need to handle some difficult timing |
76e1d14b TF |
961 | * issues otherwise. If we wait for TXBUFE in one transfer and |
962 | * then starts waiting for RXBUFF in the next, it's difficult | |
963 | * to tell the difference between the RXBUFF interrupt we're | |
964 | * actually waiting for and the RXBUFF interrupt of the | |
754ce4f2 HS |
965 | * previous transfer. |
966 | * | |
967 | * It should be doable, though. Just not now... | |
968 | */ | |
76e1d14b | 969 | spi_writel(as, IER, SPI_BIT(RXBUFF) | SPI_BIT(OVRES)); |
754ce4f2 HS |
970 | spi_writel(as, PTCR, SPI_BIT(TXTEN) | SPI_BIT(RXTEN)); |
971 | } | |
972 | ||
8da0859a DB |
973 | /* |
974 | * For DMA, tx_buf/tx_dma have the same relationship as rx_buf/rx_dma: | |
975 | * - The buffer is either valid for CPU access, else NULL | |
b595076a | 976 | * - If the buffer is valid, so is its DMA address |
8da0859a | 977 | * |
b595076a | 978 | * This driver manages the dma address unless message->is_dma_mapped. |
8da0859a DB |
979 | */ |
980 | static int | |
754ce4f2 HS |
981 | atmel_spi_dma_map_xfer(struct atmel_spi *as, struct spi_transfer *xfer) |
982 | { | |
8da0859a DB |
983 | struct device *dev = &as->pdev->dev; |
984 | ||
754ce4f2 | 985 | xfer->tx_dma = xfer->rx_dma = INVALID_DMA_ADDRESS; |
8da0859a | 986 | if (xfer->tx_buf) { |
214b574a JCPV |
987 | /* tx_buf is a const void* where we need a void * for the dma |
988 | * mapping */ | |
989 | void *nonconst_tx = (void *)xfer->tx_buf; | |
990 | ||
8da0859a | 991 | xfer->tx_dma = dma_map_single(dev, |
214b574a | 992 | nonconst_tx, xfer->len, |
754ce4f2 | 993 | DMA_TO_DEVICE); |
8d8bb39b | 994 | if (dma_mapping_error(dev, xfer->tx_dma)) |
8da0859a DB |
995 | return -ENOMEM; |
996 | } | |
997 | if (xfer->rx_buf) { | |
998 | xfer->rx_dma = dma_map_single(dev, | |
754ce4f2 HS |
999 | xfer->rx_buf, xfer->len, |
1000 | DMA_FROM_DEVICE); | |
8d8bb39b | 1001 | if (dma_mapping_error(dev, xfer->rx_dma)) { |
8da0859a DB |
1002 | if (xfer->tx_buf) |
1003 | dma_unmap_single(dev, | |
1004 | xfer->tx_dma, xfer->len, | |
1005 | DMA_TO_DEVICE); | |
1006 | return -ENOMEM; | |
1007 | } | |
1008 | } | |
1009 | return 0; | |
754ce4f2 HS |
1010 | } |
1011 | ||
1012 | static void atmel_spi_dma_unmap_xfer(struct spi_master *master, | |
1013 | struct spi_transfer *xfer) | |
1014 | { | |
1015 | if (xfer->tx_dma != INVALID_DMA_ADDRESS) | |
49dce689 | 1016 | dma_unmap_single(master->dev.parent, xfer->tx_dma, |
754ce4f2 HS |
1017 | xfer->len, DMA_TO_DEVICE); |
1018 | if (xfer->rx_dma != INVALID_DMA_ADDRESS) | |
49dce689 | 1019 | dma_unmap_single(master->dev.parent, xfer->rx_dma, |
754ce4f2 HS |
1020 | xfer->len, DMA_FROM_DEVICE); |
1021 | } | |
1022 | ||
1ccc404a NF |
1023 | static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as) |
1024 | { | |
1025 | spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); | |
1026 | } | |
1027 | ||
1ccc404a | 1028 | static void |
11f2764f | 1029 | atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer) |
1ccc404a | 1030 | { |
1ccc404a | 1031 | u8 *rxp; |
f557c98b | 1032 | u16 *rxp16; |
1ccc404a NF |
1033 | unsigned long xfer_pos = xfer->len - as->current_remaining_bytes; |
1034 | ||
1035 | if (xfer->rx_buf) { | |
f557c98b RG |
1036 | if (xfer->bits_per_word > 8) { |
1037 | rxp16 = (u16 *)(((u8 *)xfer->rx_buf) + xfer_pos); | |
1038 | *rxp16 = spi_readl(as, RDR); | |
1039 | } else { | |
1040 | rxp = ((u8 *)xfer->rx_buf) + xfer_pos; | |
1041 | *rxp = spi_readl(as, RDR); | |
1042 | } | |
1ccc404a NF |
1043 | } else { |
1044 | spi_readl(as, RDR); | |
1045 | } | |
f557c98b | 1046 | if (xfer->bits_per_word > 8) { |
b112f058 AB |
1047 | if (as->current_remaining_bytes > 2) |
1048 | as->current_remaining_bytes -= 2; | |
1049 | else | |
f557c98b RG |
1050 | as->current_remaining_bytes = 0; |
1051 | } else { | |
1052 | as->current_remaining_bytes--; | |
1053 | } | |
1ccc404a NF |
1054 | } |
1055 | ||
11f2764f CP |
1056 | static void |
1057 | atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer) | |
1058 | { | |
1059 | u32 fifolr = spi_readl(as, FLR); | |
1060 | u32 num_bytes, num_data = SPI_BFEXT(RXFL, fifolr); | |
1061 | u32 offset = xfer->len - as->current_remaining_bytes; | |
1062 | u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset); | |
1063 | u8 *bytes = (u8 *)((u8 *)xfer->rx_buf + offset); | |
1064 | u16 rd; /* RD field is the lowest 16 bits of RDR */ | |
1065 | ||
1066 | /* Update the number of remaining bytes to transfer */ | |
1067 | num_bytes = ((xfer->bits_per_word > 8) ? | |
1068 | (num_data << 1) : | |
1069 | num_data); | |
1070 | ||
1071 | if (as->current_remaining_bytes > num_bytes) | |
1072 | as->current_remaining_bytes -= num_bytes; | |
1073 | else | |
1074 | as->current_remaining_bytes = 0; | |
1075 | ||
1076 | /* Handle odd number of bytes when data are more than 8bit width */ | |
1077 | if (xfer->bits_per_word > 8) | |
1078 | as->current_remaining_bytes &= ~0x1; | |
1079 | ||
1080 | /* Read data */ | |
1081 | while (num_data) { | |
1082 | rd = spi_readl(as, RDR); | |
1083 | if (xfer->rx_buf) { | |
1084 | if (xfer->bits_per_word > 8) | |
1085 | *words++ = rd; | |
1086 | else | |
1087 | *bytes++ = rd; | |
1088 | } | |
1089 | num_data--; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /* Called from IRQ | |
1094 | * | |
1095 | * Must update "current_remaining_bytes" to keep track of data | |
1096 | * to transfer. | |
1097 | */ | |
1098 | static void | |
1099 | atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer) | |
1100 | { | |
1101 | if (as->fifo_size) | |
1102 | atmel_spi_pump_fifo_data(as, xfer); | |
1103 | else | |
1104 | atmel_spi_pump_single_data(as, xfer); | |
1105 | } | |
1106 | ||
1ccc404a NF |
1107 | /* Interrupt |
1108 | * | |
1109 | * No need for locking in this Interrupt handler: done_status is the | |
8090d6d1 | 1110 | * only information modified. |
1ccc404a NF |
1111 | */ |
1112 | static irqreturn_t | |
1113 | atmel_spi_pio_interrupt(int irq, void *dev_id) | |
1114 | { | |
1115 | struct spi_master *master = dev_id; | |
1116 | struct atmel_spi *as = spi_master_get_devdata(master); | |
1117 | u32 status, pending, imr; | |
1118 | struct spi_transfer *xfer; | |
1119 | int ret = IRQ_NONE; | |
1120 | ||
1121 | imr = spi_readl(as, IMR); | |
1122 | status = spi_readl(as, SR); | |
1123 | pending = status & imr; | |
1124 | ||
1125 | if (pending & SPI_BIT(OVRES)) { | |
1126 | ret = IRQ_HANDLED; | |
1127 | spi_writel(as, IDR, SPI_BIT(OVRES)); | |
1128 | dev_warn(master->dev.parent, "overrun\n"); | |
1129 | ||
1130 | /* | |
1131 | * When we get an overrun, we disregard the current | |
1132 | * transfer. Data will not be copied back from any | |
1133 | * bounce buffer and msg->actual_len will not be | |
1134 | * updated with the last xfer. | |
1135 | * | |
1136 | * We will also not process any remaning transfers in | |
1137 | * the message. | |
1ccc404a NF |
1138 | */ |
1139 | as->done_status = -EIO; | |
1140 | smp_wmb(); | |
1141 | ||
1142 | /* Clear any overrun happening while cleaning up */ | |
1143 | spi_readl(as, SR); | |
1144 | ||
8090d6d1 | 1145 | complete(&as->xfer_completion); |
1ccc404a | 1146 | |
11f2764f | 1147 | } else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) { |
1ccc404a NF |
1148 | atmel_spi_lock(as); |
1149 | ||
1150 | if (as->current_remaining_bytes) { | |
1151 | ret = IRQ_HANDLED; | |
1152 | xfer = as->current_transfer; | |
1153 | atmel_spi_pump_pio_data(as, xfer); | |
8090d6d1 | 1154 | if (!as->current_remaining_bytes) |
1ccc404a | 1155 | spi_writel(as, IDR, pending); |
8090d6d1 WY |
1156 | |
1157 | complete(&as->xfer_completion); | |
1ccc404a NF |
1158 | } |
1159 | ||
1160 | atmel_spi_unlock(as); | |
1161 | } else { | |
1162 | WARN_ONCE(pending, "IRQ not handled, pending = %x\n", pending); | |
1163 | ret = IRQ_HANDLED; | |
1164 | spi_writel(as, IDR, pending); | |
1165 | } | |
1166 | ||
1167 | return ret; | |
754ce4f2 HS |
1168 | } |
1169 | ||
1170 | static irqreturn_t | |
1ccc404a | 1171 | atmel_spi_pdc_interrupt(int irq, void *dev_id) |
754ce4f2 HS |
1172 | { |
1173 | struct spi_master *master = dev_id; | |
1174 | struct atmel_spi *as = spi_master_get_devdata(master); | |
754ce4f2 HS |
1175 | u32 status, pending, imr; |
1176 | int ret = IRQ_NONE; | |
1177 | ||
754ce4f2 HS |
1178 | imr = spi_readl(as, IMR); |
1179 | status = spi_readl(as, SR); | |
1180 | pending = status & imr; | |
1181 | ||
1182 | if (pending & SPI_BIT(OVRES)) { | |
754ce4f2 HS |
1183 | |
1184 | ret = IRQ_HANDLED; | |
1185 | ||
dc329442 | 1186 | spi_writel(as, IDR, (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX) |
754ce4f2 HS |
1187 | | SPI_BIT(OVRES))); |
1188 | ||
754ce4f2 HS |
1189 | /* Clear any overrun happening while cleaning up */ |
1190 | spi_readl(as, SR); | |
1191 | ||
823cd045 | 1192 | as->done_status = -EIO; |
8090d6d1 WY |
1193 | |
1194 | complete(&as->xfer_completion); | |
1195 | ||
dc329442 | 1196 | } else if (pending & (SPI_BIT(RXBUFF) | SPI_BIT(ENDRX))) { |
754ce4f2 HS |
1197 | ret = IRQ_HANDLED; |
1198 | ||
1199 | spi_writel(as, IDR, pending); | |
1200 | ||
8090d6d1 | 1201 | complete(&as->xfer_completion); |
754ce4f2 HS |
1202 | } |
1203 | ||
754ce4f2 HS |
1204 | return ret; |
1205 | } | |
1206 | ||
754ce4f2 HS |
1207 | static int atmel_spi_setup(struct spi_device *spi) |
1208 | { | |
1209 | struct atmel_spi *as; | |
5ee36c98 | 1210 | struct atmel_spi_device *asd; |
d3b72c7e | 1211 | u32 csr; |
754ce4f2 | 1212 | unsigned int bits = spi->bits_per_word; |
754ce4f2 HS |
1213 | unsigned int npcs_pin; |
1214 | int ret; | |
1215 | ||
1216 | as = spi_master_get_devdata(spi->master); | |
1217 | ||
defbd3b4 | 1218 | /* see notes above re chipselect */ |
d4820b74 | 1219 | if (!atmel_spi_is_v2(as) |
defbd3b4 DB |
1220 | && spi->chip_select == 0 |
1221 | && (spi->mode & SPI_CS_HIGH)) { | |
1222 | dev_dbg(&spi->dev, "setup: can't be active-high\n"); | |
1223 | return -EINVAL; | |
1224 | } | |
1225 | ||
d3b72c7e | 1226 | csr = SPI_BF(BITS, bits - 8); |
754ce4f2 HS |
1227 | if (spi->mode & SPI_CPOL) |
1228 | csr |= SPI_BIT(CPOL); | |
1229 | if (!(spi->mode & SPI_CPHA)) | |
1230 | csr |= SPI_BIT(NCPHA); | |
48203034 CP |
1231 | if (!as->use_cs_gpios) |
1232 | csr |= SPI_BIT(CSAAT); | |
754ce4f2 | 1233 | |
1eed29df HS |
1234 | /* DLYBS is mostly irrelevant since we manage chipselect using GPIOs. |
1235 | * | |
1236 | * DLYBCT would add delays between words, slowing down transfers. | |
1237 | * It could potentially be useful to cope with DMA bottlenecks, but | |
1238 | * in those cases it's probably best to just use a lower bitrate. | |
1239 | */ | |
1240 | csr |= SPI_BF(DLYBS, 0); | |
1241 | csr |= SPI_BF(DLYBCT, 0); | |
754ce4f2 HS |
1242 | |
1243 | /* chipselect must have been muxed as GPIO (e.g. in board setup) */ | |
67f08d69 | 1244 | npcs_pin = (unsigned long)spi->controller_data; |
850a5b67 | 1245 | |
48203034 CP |
1246 | if (!as->use_cs_gpios) |
1247 | npcs_pin = spi->chip_select; | |
1248 | else if (gpio_is_valid(spi->cs_gpio)) | |
850a5b67 JCPV |
1249 | npcs_pin = spi->cs_gpio; |
1250 | ||
5ee36c98 HS |
1251 | asd = spi->controller_state; |
1252 | if (!asd) { | |
1253 | asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL); | |
1254 | if (!asd) | |
1255 | return -ENOMEM; | |
1256 | ||
48203034 CP |
1257 | if (as->use_cs_gpios) { |
1258 | ret = gpio_request(npcs_pin, dev_name(&spi->dev)); | |
1259 | if (ret) { | |
1260 | kfree(asd); | |
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | gpio_direction_output(npcs_pin, | |
1265 | !(spi->mode & SPI_CS_HIGH)); | |
5ee36c98 HS |
1266 | } |
1267 | ||
1268 | asd->npcs_pin = npcs_pin; | |
1269 | spi->controller_state = asd; | |
754ce4f2 HS |
1270 | } |
1271 | ||
5ee36c98 HS |
1272 | asd->csr = csr; |
1273 | ||
754ce4f2 | 1274 | dev_dbg(&spi->dev, |
d3b72c7e RG |
1275 | "setup: bpw %u mode 0x%x -> csr%d %08x\n", |
1276 | bits, spi->mode, spi->chip_select, csr); | |
754ce4f2 | 1277 | |
d4820b74 | 1278 | if (!atmel_spi_is_v2(as)) |
5ee36c98 | 1279 | spi_writel(as, CSR0 + 4 * spi->chip_select, csr); |
754ce4f2 HS |
1280 | |
1281 | return 0; | |
1282 | } | |
1283 | ||
8090d6d1 WY |
1284 | static int atmel_spi_one_transfer(struct spi_master *master, |
1285 | struct spi_message *msg, | |
1286 | struct spi_transfer *xfer) | |
754ce4f2 HS |
1287 | { |
1288 | struct atmel_spi *as; | |
8090d6d1 | 1289 | struct spi_device *spi = msg->spi; |
b9d228f9 | 1290 | u8 bits; |
8090d6d1 | 1291 | u32 len; |
b9d228f9 | 1292 | struct atmel_spi_device *asd; |
8090d6d1 WY |
1293 | int timeout; |
1294 | int ret; | |
1369dea6 | 1295 | unsigned long dma_timeout; |
754ce4f2 | 1296 | |
8090d6d1 | 1297 | as = spi_master_get_devdata(master); |
754ce4f2 | 1298 | |
8090d6d1 WY |
1299 | if (!(xfer->tx_buf || xfer->rx_buf) && xfer->len) { |
1300 | dev_dbg(&spi->dev, "missing rx or tx buf\n"); | |
754ce4f2 | 1301 | return -EINVAL; |
8090d6d1 | 1302 | } |
754ce4f2 | 1303 | |
8090d6d1 WY |
1304 | if (xfer->bits_per_word) { |
1305 | asd = spi->controller_state; | |
1306 | bits = (asd->csr >> 4) & 0xf; | |
1307 | if (bits != xfer->bits_per_word - 8) { | |
1308 | dev_dbg(&spi->dev, | |
1309 | "you can't yet change bits_per_word in transfers\n"); | |
1310 | return -ENOPROTOOPT; | |
1311 | } | |
1312 | } | |
754ce4f2 | 1313 | |
8090d6d1 WY |
1314 | /* |
1315 | * DMA map early, for performance (empties dcache ASAP) and | |
1316 | * better fault reporting. | |
1317 | */ | |
1318 | if ((!msg->is_dma_mapped) | |
1319 | && (atmel_spi_use_dma(as, xfer) || as->use_pdc)) { | |
1320 | if (atmel_spi_dma_map_xfer(as, xfer) < 0) | |
1321 | return -ENOMEM; | |
1322 | } | |
1323 | ||
1324 | atmel_spi_set_xfer_speed(as, msg->spi, xfer); | |
754ce4f2 | 1325 | |
8090d6d1 WY |
1326 | as->done_status = 0; |
1327 | as->current_transfer = xfer; | |
1328 | as->current_remaining_bytes = xfer->len; | |
1329 | while (as->current_remaining_bytes) { | |
1330 | reinit_completion(&as->xfer_completion); | |
1331 | ||
1332 | if (as->use_pdc) { | |
1333 | atmel_spi_pdc_next_xfer(master, msg, xfer); | |
1334 | } else if (atmel_spi_use_dma(as, xfer)) { | |
1335 | len = as->current_remaining_bytes; | |
1336 | ret = atmel_spi_next_xfer_dma_submit(master, | |
1337 | xfer, &len); | |
1338 | if (ret) { | |
1339 | dev_err(&spi->dev, | |
1340 | "unable to use DMA, fallback to PIO\n"); | |
1341 | atmel_spi_next_xfer_pio(master, xfer); | |
1342 | } else { | |
1343 | as->current_remaining_bytes -= len; | |
0c3b9748 AL |
1344 | if (as->current_remaining_bytes < 0) |
1345 | as->current_remaining_bytes = 0; | |
b9d228f9 | 1346 | } |
8090d6d1 WY |
1347 | } else { |
1348 | atmel_spi_next_xfer_pio(master, xfer); | |
b9d228f9 MB |
1349 | } |
1350 | ||
1676014e AS |
1351 | /* interrupts are disabled, so free the lock for schedule */ |
1352 | atmel_spi_unlock(as); | |
1369dea6 NMG |
1353 | dma_timeout = wait_for_completion_timeout(&as->xfer_completion, |
1354 | SPI_DMA_TIMEOUT); | |
1676014e | 1355 | atmel_spi_lock(as); |
1369dea6 NMG |
1356 | if (WARN_ON(dma_timeout == 0)) { |
1357 | dev_err(&spi->dev, "spi transfer timeout\n"); | |
8090d6d1 | 1358 | as->done_status = -EIO; |
f557c98b RG |
1359 | } |
1360 | ||
8090d6d1 WY |
1361 | if (as->done_status) |
1362 | break; | |
1363 | } | |
1364 | ||
1365 | if (as->done_status) { | |
1366 | if (as->use_pdc) { | |
1367 | dev_warn(master->dev.parent, | |
1368 | "overrun (%u/%u remaining)\n", | |
1369 | spi_readl(as, TCR), spi_readl(as, RCR)); | |
1370 | ||
1371 | /* | |
1372 | * Clean up DMA registers and make sure the data | |
1373 | * registers are empty. | |
1374 | */ | |
1375 | spi_writel(as, RNCR, 0); | |
1376 | spi_writel(as, TNCR, 0); | |
1377 | spi_writel(as, RCR, 0); | |
1378 | spi_writel(as, TCR, 0); | |
1379 | for (timeout = 1000; timeout; timeout--) | |
1380 | if (spi_readl(as, SR) & SPI_BIT(TXEMPTY)) | |
1381 | break; | |
1382 | if (!timeout) | |
1383 | dev_warn(master->dev.parent, | |
1384 | "timeout waiting for TXEMPTY"); | |
1385 | while (spi_readl(as, SR) & SPI_BIT(RDRF)) | |
1386 | spi_readl(as, RDR); | |
1387 | ||
1388 | /* Clear any overrun happening while cleaning up */ | |
1389 | spi_readl(as, SR); | |
1390 | ||
1391 | } else if (atmel_spi_use_dma(as, xfer)) { | |
1392 | atmel_spi_stop_dma(as); | |
1393 | } | |
1394 | ||
1395 | if (!msg->is_dma_mapped | |
1396 | && (atmel_spi_use_dma(as, xfer) || as->use_pdc)) | |
1397 | atmel_spi_dma_unmap_xfer(master, xfer); | |
1398 | ||
1399 | return 0; | |
1400 | ||
1401 | } else { | |
1402 | /* only update length if no error */ | |
1403 | msg->actual_length += xfer->len; | |
1404 | } | |
1405 | ||
1406 | if (!msg->is_dma_mapped | |
1407 | && (atmel_spi_use_dma(as, xfer) || as->use_pdc)) | |
1408 | atmel_spi_dma_unmap_xfer(master, xfer); | |
1409 | ||
1410 | if (xfer->delay_usecs) | |
1411 | udelay(xfer->delay_usecs); | |
1412 | ||
1413 | if (xfer->cs_change) { | |
1414 | if (list_is_last(&xfer->transfer_list, | |
1415 | &msg->transfers)) { | |
1416 | as->keep_cs = true; | |
1417 | } else { | |
1418 | as->cs_active = !as->cs_active; | |
1419 | if (as->cs_active) | |
1420 | cs_activate(as, msg->spi); | |
1421 | else | |
1422 | cs_deactivate(as, msg->spi); | |
8da0859a | 1423 | } |
754ce4f2 HS |
1424 | } |
1425 | ||
8090d6d1 WY |
1426 | return 0; |
1427 | } | |
1428 | ||
1429 | static int atmel_spi_transfer_one_message(struct spi_master *master, | |
1430 | struct spi_message *msg) | |
1431 | { | |
1432 | struct atmel_spi *as; | |
1433 | struct spi_transfer *xfer; | |
1434 | struct spi_device *spi = msg->spi; | |
1435 | int ret = 0; | |
1436 | ||
1437 | as = spi_master_get_devdata(master); | |
1438 | ||
1439 | dev_dbg(&spi->dev, "new message %p submitted for %s\n", | |
1440 | msg, dev_name(&spi->dev)); | |
1441 | ||
8090d6d1 WY |
1442 | atmel_spi_lock(as); |
1443 | cs_activate(as, spi); | |
1444 | ||
1445 | as->cs_active = true; | |
1446 | as->keep_cs = false; | |
1447 | ||
1448 | msg->status = 0; | |
1449 | msg->actual_length = 0; | |
1450 | ||
1451 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { | |
1452 | ret = atmel_spi_one_transfer(master, msg, xfer); | |
1453 | if (ret) | |
1454 | goto msg_done; | |
1455 | } | |
1456 | ||
1457 | if (as->use_pdc) | |
1458 | atmel_spi_disable_pdc_transfer(as); | |
1459 | ||
754ce4f2 | 1460 | list_for_each_entry(xfer, &msg->transfers, transfer_list) { |
8090d6d1 | 1461 | dev_dbg(&spi->dev, |
54f4c51c | 1462 | " xfer %p: len %u tx %p/%pad rx %p/%pad\n", |
754ce4f2 | 1463 | xfer, xfer->len, |
54f4c51c RD |
1464 | xfer->tx_buf, &xfer->tx_dma, |
1465 | xfer->rx_buf, &xfer->rx_dma); | |
754ce4f2 HS |
1466 | } |
1467 | ||
8090d6d1 WY |
1468 | msg_done: |
1469 | if (!as->keep_cs) | |
1470 | cs_deactivate(as, msg->spi); | |
754ce4f2 | 1471 | |
8aad7924 | 1472 | atmel_spi_unlock(as); |
754ce4f2 | 1473 | |
8090d6d1 WY |
1474 | msg->status = as->done_status; |
1475 | spi_finalize_current_message(spi->master); | |
1476 | ||
1477 | return ret; | |
754ce4f2 HS |
1478 | } |
1479 | ||
bb2d1c36 | 1480 | static void atmel_spi_cleanup(struct spi_device *spi) |
754ce4f2 | 1481 | { |
5ee36c98 | 1482 | struct atmel_spi_device *asd = spi->controller_state; |
67f08d69 | 1483 | unsigned gpio = (unsigned long) spi->controller_data; |
defbd3b4 | 1484 | |
5ee36c98 | 1485 | if (!asd) |
defbd3b4 DB |
1486 | return; |
1487 | ||
5ee36c98 | 1488 | spi->controller_state = NULL; |
defbd3b4 | 1489 | gpio_free(gpio); |
5ee36c98 | 1490 | kfree(asd); |
754ce4f2 HS |
1491 | } |
1492 | ||
d4820b74 WY |
1493 | static inline unsigned int atmel_get_version(struct atmel_spi *as) |
1494 | { | |
1495 | return spi_readl(as, VERSION) & 0x00000fff; | |
1496 | } | |
1497 | ||
1498 | static void atmel_get_caps(struct atmel_spi *as) | |
1499 | { | |
1500 | unsigned int version; | |
1501 | ||
1502 | version = atmel_get_version(as); | |
1503 | dev_info(&as->pdev->dev, "version: 0x%x\n", version); | |
1504 | ||
1505 | as->caps.is_spi2 = version > 0x121; | |
1506 | as->caps.has_wdrbt = version >= 0x210; | |
1507 | as->caps.has_dma_support = version >= 0x212; | |
1508 | } | |
1509 | ||
754ce4f2 HS |
1510 | /*-------------------------------------------------------------------------*/ |
1511 | ||
fd4a319b | 1512 | static int atmel_spi_probe(struct platform_device *pdev) |
754ce4f2 HS |
1513 | { |
1514 | struct resource *regs; | |
1515 | int irq; | |
1516 | struct clk *clk; | |
1517 | int ret; | |
1518 | struct spi_master *master; | |
1519 | struct atmel_spi *as; | |
1520 | ||
5bdfd491 WY |
1521 | /* Select default pin state */ |
1522 | pinctrl_pm_select_default_state(&pdev->dev); | |
1523 | ||
754ce4f2 HS |
1524 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
1525 | if (!regs) | |
1526 | return -ENXIO; | |
1527 | ||
1528 | irq = platform_get_irq(pdev, 0); | |
1529 | if (irq < 0) | |
1530 | return irq; | |
1531 | ||
9f87d6f2 | 1532 | clk = devm_clk_get(&pdev->dev, "spi_clk"); |
754ce4f2 HS |
1533 | if (IS_ERR(clk)) |
1534 | return PTR_ERR(clk); | |
1535 | ||
1536 | /* setup spi core then atmel-specific driver state */ | |
1537 | ret = -ENOMEM; | |
a536d765 | 1538 | master = spi_alloc_master(&pdev->dev, sizeof(*as)); |
754ce4f2 HS |
1539 | if (!master) |
1540 | goto out_free; | |
1541 | ||
e7db06b5 DB |
1542 | /* the spi->mode bits understood by this driver: */ |
1543 | master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; | |
24778be2 | 1544 | master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 16); |
850a5b67 | 1545 | master->dev.of_node = pdev->dev.of_node; |
754ce4f2 | 1546 | master->bus_num = pdev->id; |
850a5b67 | 1547 | master->num_chipselect = master->dev.of_node ? 0 : 4; |
754ce4f2 | 1548 | master->setup = atmel_spi_setup; |
8090d6d1 | 1549 | master->transfer_one_message = atmel_spi_transfer_one_message; |
754ce4f2 | 1550 | master->cleanup = atmel_spi_cleanup; |
ce0c4caf | 1551 | master->auto_runtime_pm = true; |
754ce4f2 HS |
1552 | platform_set_drvdata(pdev, master); |
1553 | ||
1554 | as = spi_master_get_devdata(master); | |
1555 | ||
8da0859a DB |
1556 | /* |
1557 | * Scratch buffer is used for throwaway rx and tx data. | |
1558 | * It's coherent to minimize dcache pollution. | |
1559 | */ | |
754ce4f2 HS |
1560 | as->buffer = dma_alloc_coherent(&pdev->dev, BUFFER_SIZE, |
1561 | &as->buffer_dma, GFP_KERNEL); | |
1562 | if (!as->buffer) | |
1563 | goto out_free; | |
1564 | ||
1565 | spin_lock_init(&as->lock); | |
1ccc404a | 1566 | |
754ce4f2 | 1567 | as->pdev = pdev; |
31407478 | 1568 | as->regs = devm_ioremap_resource(&pdev->dev, regs); |
543c954d WY |
1569 | if (IS_ERR(as->regs)) { |
1570 | ret = PTR_ERR(as->regs); | |
754ce4f2 | 1571 | goto out_free_buffer; |
543c954d | 1572 | } |
dfab30ee | 1573 | as->phybase = regs->start; |
754ce4f2 HS |
1574 | as->irq = irq; |
1575 | as->clk = clk; | |
754ce4f2 | 1576 | |
8090d6d1 WY |
1577 | init_completion(&as->xfer_completion); |
1578 | ||
d4820b74 WY |
1579 | atmel_get_caps(as); |
1580 | ||
48203034 CP |
1581 | as->use_cs_gpios = true; |
1582 | if (atmel_spi_is_v2(as) && | |
1583 | !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) { | |
1584 | as->use_cs_gpios = false; | |
1585 | master->num_chipselect = 4; | |
1586 | } | |
1587 | ||
1ccc404a NF |
1588 | as->use_dma = false; |
1589 | as->use_pdc = false; | |
1590 | if (as->caps.has_dma_support) { | |
5e9af37e LD |
1591 | ret = atmel_spi_configure_dma(as); |
1592 | if (ret == 0) | |
1ccc404a | 1593 | as->use_dma = true; |
5e9af37e LD |
1594 | else if (ret == -EPROBE_DEFER) |
1595 | return ret; | |
1ccc404a NF |
1596 | } else { |
1597 | as->use_pdc = true; | |
1598 | } | |
1599 | ||
1600 | if (as->caps.has_dma_support && !as->use_dma) | |
1601 | dev_info(&pdev->dev, "Atmel SPI Controller using PIO only\n"); | |
1602 | ||
1603 | if (as->use_pdc) { | |
9f87d6f2 JH |
1604 | ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pdc_interrupt, |
1605 | 0, dev_name(&pdev->dev), master); | |
1ccc404a | 1606 | } else { |
9f87d6f2 JH |
1607 | ret = devm_request_irq(&pdev->dev, irq, atmel_spi_pio_interrupt, |
1608 | 0, dev_name(&pdev->dev), master); | |
1ccc404a | 1609 | } |
754ce4f2 HS |
1610 | if (ret) |
1611 | goto out_unmap_regs; | |
1612 | ||
1613 | /* Initialize the hardware */ | |
dfec4a6e BB |
1614 | ret = clk_prepare_enable(clk); |
1615 | if (ret) | |
de8cc234 | 1616 | goto out_free_irq; |
754ce4f2 | 1617 | spi_writel(as, CR, SPI_BIT(SWRST)); |
50d7d5bf | 1618 | spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ |
d4820b74 WY |
1619 | if (as->caps.has_wdrbt) { |
1620 | spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS) | |
1621 | | SPI_BIT(MSTR)); | |
1622 | } else { | |
1623 | spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS)); | |
1624 | } | |
1ccc404a NF |
1625 | |
1626 | if (as->use_pdc) | |
1627 | spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS)); | |
754ce4f2 HS |
1628 | spi_writel(as, CR, SPI_BIT(SPIEN)); |
1629 | ||
11f2764f CP |
1630 | as->fifo_size = 0; |
1631 | if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size", | |
1632 | &as->fifo_size)) { | |
1633 | dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size); | |
1634 | spi_writel(as, CR, SPI_BIT(FIFOEN)); | |
1635 | } | |
1636 | ||
754ce4f2 HS |
1637 | /* go! */ |
1638 | dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n", | |
1639 | (unsigned long)regs->start, irq); | |
1640 | ||
ce0c4caf WY |
1641 | pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT); |
1642 | pm_runtime_use_autosuspend(&pdev->dev); | |
1643 | pm_runtime_set_active(&pdev->dev); | |
1644 | pm_runtime_enable(&pdev->dev); | |
1645 | ||
9f87d6f2 | 1646 | ret = devm_spi_register_master(&pdev->dev, master); |
754ce4f2 | 1647 | if (ret) |
1ccc404a | 1648 | goto out_free_dma; |
754ce4f2 HS |
1649 | |
1650 | return 0; | |
1651 | ||
1ccc404a | 1652 | out_free_dma: |
ce0c4caf WY |
1653 | pm_runtime_disable(&pdev->dev); |
1654 | pm_runtime_set_suspended(&pdev->dev); | |
1655 | ||
1ccc404a NF |
1656 | if (as->use_dma) |
1657 | atmel_spi_release_dma(as); | |
1658 | ||
754ce4f2 | 1659 | spi_writel(as, CR, SPI_BIT(SWRST)); |
50d7d5bf | 1660 | spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ |
dfec4a6e | 1661 | clk_disable_unprepare(clk); |
de8cc234 | 1662 | out_free_irq: |
754ce4f2 | 1663 | out_unmap_regs: |
754ce4f2 HS |
1664 | out_free_buffer: |
1665 | dma_free_coherent(&pdev->dev, BUFFER_SIZE, as->buffer, | |
1666 | as->buffer_dma); | |
1667 | out_free: | |
754ce4f2 HS |
1668 | spi_master_put(master); |
1669 | return ret; | |
1670 | } | |
1671 | ||
fd4a319b | 1672 | static int atmel_spi_remove(struct platform_device *pdev) |
754ce4f2 HS |
1673 | { |
1674 | struct spi_master *master = platform_get_drvdata(pdev); | |
1675 | struct atmel_spi *as = spi_master_get_devdata(master); | |
754ce4f2 | 1676 | |
ce0c4caf WY |
1677 | pm_runtime_get_sync(&pdev->dev); |
1678 | ||
754ce4f2 HS |
1679 | /* reset the hardware and block queue progress */ |
1680 | spin_lock_irq(&as->lock); | |
1ccc404a NF |
1681 | if (as->use_dma) { |
1682 | atmel_spi_stop_dma(as); | |
1683 | atmel_spi_release_dma(as); | |
1684 | } | |
1685 | ||
754ce4f2 | 1686 | spi_writel(as, CR, SPI_BIT(SWRST)); |
50d7d5bf | 1687 | spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */ |
754ce4f2 HS |
1688 | spi_readl(as, SR); |
1689 | spin_unlock_irq(&as->lock); | |
1690 | ||
754ce4f2 HS |
1691 | dma_free_coherent(&pdev->dev, BUFFER_SIZE, as->buffer, |
1692 | as->buffer_dma); | |
1693 | ||
dfec4a6e | 1694 | clk_disable_unprepare(as->clk); |
754ce4f2 | 1695 | |
ce0c4caf WY |
1696 | pm_runtime_put_noidle(&pdev->dev); |
1697 | pm_runtime_disable(&pdev->dev); | |
1698 | ||
754ce4f2 HS |
1699 | return 0; |
1700 | } | |
1701 | ||
ce0c4caf | 1702 | #ifdef CONFIG_PM |
c1ee8f3f WY |
1703 | static int atmel_spi_runtime_suspend(struct device *dev) |
1704 | { | |
1705 | struct spi_master *master = dev_get_drvdata(dev); | |
1706 | struct atmel_spi *as = spi_master_get_devdata(master); | |
1707 | ||
1708 | clk_disable_unprepare(as->clk); | |
1709 | pinctrl_pm_select_sleep_state(dev); | |
1710 | ||
1711 | return 0; | |
1712 | } | |
1713 | ||
1714 | static int atmel_spi_runtime_resume(struct device *dev) | |
1715 | { | |
1716 | struct spi_master *master = dev_get_drvdata(dev); | |
1717 | struct atmel_spi *as = spi_master_get_devdata(master); | |
1718 | ||
1719 | pinctrl_pm_select_default_state(dev); | |
1720 | ||
1721 | return clk_prepare_enable(as->clk); | |
1722 | } | |
1723 | ||
ec60dd37 | 1724 | static int atmel_spi_suspend(struct device *dev) |
754ce4f2 | 1725 | { |
c1ee8f3f | 1726 | struct spi_master *master = dev_get_drvdata(dev); |
ba938f3a WY |
1727 | int ret; |
1728 | ||
1729 | /* Stop the queue running */ | |
1730 | ret = spi_master_suspend(master); | |
1731 | if (ret) { | |
1732 | dev_warn(dev, "cannot suspend master\n"); | |
1733 | return ret; | |
1734 | } | |
754ce4f2 | 1735 | |
c1ee8f3f WY |
1736 | if (!pm_runtime_suspended(dev)) |
1737 | atmel_spi_runtime_suspend(dev); | |
5bdfd491 | 1738 | |
754ce4f2 HS |
1739 | return 0; |
1740 | } | |
1741 | ||
ec60dd37 | 1742 | static int atmel_spi_resume(struct device *dev) |
754ce4f2 | 1743 | { |
c1ee8f3f | 1744 | struct spi_master *master = dev_get_drvdata(dev); |
ba938f3a | 1745 | int ret; |
754ce4f2 | 1746 | |
ce0c4caf | 1747 | if (!pm_runtime_suspended(dev)) { |
c1ee8f3f | 1748 | ret = atmel_spi_runtime_resume(dev); |
ce0c4caf WY |
1749 | if (ret) |
1750 | return ret; | |
1751 | } | |
ba938f3a WY |
1752 | |
1753 | /* Start the queue running */ | |
1754 | ret = spi_master_resume(master); | |
1755 | if (ret) | |
1756 | dev_err(dev, "problem starting queue (%d)\n", ret); | |
1757 | ||
1758 | return ret; | |
754ce4f2 | 1759 | } |
ce0c4caf WY |
1760 | |
1761 | static const struct dev_pm_ops atmel_spi_pm_ops = { | |
1762 | SET_SYSTEM_SLEEP_PM_OPS(atmel_spi_suspend, atmel_spi_resume) | |
1763 | SET_RUNTIME_PM_OPS(atmel_spi_runtime_suspend, | |
1764 | atmel_spi_runtime_resume, NULL) | |
1765 | }; | |
ec60dd37 | 1766 | #define ATMEL_SPI_PM_OPS (&atmel_spi_pm_ops) |
754ce4f2 | 1767 | #else |
ec60dd37 | 1768 | #define ATMEL_SPI_PM_OPS NULL |
754ce4f2 HS |
1769 | #endif |
1770 | ||
850a5b67 JCPV |
1771 | #if defined(CONFIG_OF) |
1772 | static const struct of_device_id atmel_spi_dt_ids[] = { | |
1773 | { .compatible = "atmel,at91rm9200-spi" }, | |
1774 | { /* sentinel */ } | |
1775 | }; | |
1776 | ||
1777 | MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids); | |
1778 | #endif | |
754ce4f2 HS |
1779 | |
1780 | static struct platform_driver atmel_spi_driver = { | |
1781 | .driver = { | |
1782 | .name = "atmel_spi", | |
ec60dd37 | 1783 | .pm = ATMEL_SPI_PM_OPS, |
850a5b67 | 1784 | .of_match_table = of_match_ptr(atmel_spi_dt_ids), |
754ce4f2 | 1785 | }, |
1cb201af | 1786 | .probe = atmel_spi_probe, |
2deff8d6 | 1787 | .remove = atmel_spi_remove, |
754ce4f2 | 1788 | }; |
940ab889 | 1789 | module_platform_driver(atmel_spi_driver); |
754ce4f2 HS |
1790 | |
1791 | MODULE_DESCRIPTION("Atmel AT32/AT91 SPI Controller driver"); | |
e05503ef | 1792 | MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); |
754ce4f2 | 1793 | MODULE_LICENSE("GPL"); |
7e38c3c4 | 1794 | MODULE_ALIAS("platform:atmel_spi"); |