projects / openwrt.git / blob
? search:


829fcf02055eb49c4e83cb3ac076d9199877189c
[openwrt.git] / target / linux / brcm63xx / patches-2.6.38 / 240-spi.patch
1 --- a/arch/mips/bcm63xx/cpu.c
2 +++ b/arch/mips/bcm63xx/cpu.c
3 @@ -58,6 +58,7 @@ static const unsigned long bcm96338_regs
4
5 static const int bcm96338_irqs[] = {
6 [IRQ_TIMER] = BCM_6338_TIMER_IRQ,
7 + [IRQ_SPI] = BCM_6338_SPI_IRQ,
8 [IRQ_UART0] = BCM_6338_UART0_IRQ,
9 [IRQ_DSL] = BCM_6338_DSL_IRQ,
10 [IRQ_ENET0] = BCM_6338_ENET0_IRQ,
11 @@ -132,6 +133,7 @@ static const unsigned long bcm96348_regs
12
13 static const int bcm96348_irqs[] = {
14 [IRQ_TIMER] = BCM_6348_TIMER_IRQ,
15 + [IRQ_SPI] = BCM_6348_SPI_IRQ,
16 [IRQ_UART0] = BCM_6348_UART0_IRQ,
17 [IRQ_DSL] = BCM_6348_DSL_IRQ,
18 [IRQ_ENET0] = BCM_6348_ENET0_IRQ,
19 @@ -175,6 +177,7 @@ static const unsigned long bcm96358_regs
20
21 static const int bcm96358_irqs[] = {
22 [IRQ_TIMER] = BCM_6358_TIMER_IRQ,
23 + [IRQ_SPI] = BCM_6358_SPI_IRQ,
24 [IRQ_UART0] = BCM_6358_UART0_IRQ,
25 [IRQ_UART1] = BCM_6358_UART1_IRQ,
26 [IRQ_DSL] = BCM_6358_DSL_IRQ,
27 --- /dev/null
28 +++ b/arch/mips/bcm63xx/dev-spi.c
29 @@ -0,0 +1,128 @@
30 +/*
31 + * This file is subject to the terms and conditions of the GNU General Public
32 + * License. See the file "COPYING" in the main directory of this archive
33 + * for more details.
34 + *
35 + * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
36 + * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
37 + */
38 +
39 +#include <linux/init.h>
40 +#include <linux/kernel.h>
41 +#include <linux/platform_device.h>
42 +
43 +#include <bcm63xx_cpu.h>
44 +#include <bcm63xx_dev_spi.h>
45 +#include <bcm63xx_regs.h>
46 +
47 +#ifdef BCMCPU_RUNTIME_DETECT
48 +/*
49 + * register offsets
50 + */
51 +static const unsigned long bcm96338_regs_spi[] = {
52 + [SPI_CMD] = SPI_BCM_6338_SPI_CMD,
53 + [SPI_INT_STATUS] = SPI_BCM_6338_SPI_INT_STATUS,
54 + [SPI_INT_MASK_ST] = SPI_BCM_6338_SPI_MASK_INT_ST,
55 + [SPI_INT_MASK] = SPI_BCM_6338_SPI_INT_MASK,
56 + [SPI_ST] = SPI_BCM_6338_SPI_ST,
57 + [SPI_CLK_CFG] = SPI_BCM_6338_SPI_CLK_CFG,
58 + [SPI_FILL_BYTE] = SPI_BCM_6338_SPI_FILL_BYTE,
59 + [SPI_MSG_TAIL] = SPI_BCM_6338_SPI_MSG_TAIL,
60 + [SPI_RX_TAIL] = SPI_BCM_6338_SPI_RX_TAIL,
61 + [SPI_MSG_CTL] = SPI_BCM_6338_SPI_MSG_CTL,
62 + [SPI_MSG_DATA] = SPI_BCM_6338_SPI_MSG_DATA,
63 + [SPI_RX_DATA] = SPI_BCM_6338_SPI_RX_DATA,
64 +};
65 +
66 +static const unsigned long bcm96348_regs_spi[] = {
67 + [SPI_CMD] = SPI_BCM_6348_SPI_CMD,
68 + [SPI_INT_STATUS] = SPI_BCM_6348_SPI_INT_STATUS,
69 + [SPI_INT_MASK_ST] = SPI_BCM_6348_SPI_MASK_INT_ST,
70 + [SPI_INT_MASK] = SPI_BCM_6348_SPI_INT_MASK,
71 + [SPI_ST] = SPI_BCM_6348_SPI_ST,
72 + [SPI_CLK_CFG] = SPI_BCM_6348_SPI_CLK_CFG,
73 + [SPI_FILL_BYTE] = SPI_BCM_6348_SPI_FILL_BYTE,
74 + [SPI_MSG_TAIL] = SPI_BCM_6348_SPI_MSG_TAIL,
75 + [SPI_RX_TAIL] = SPI_BCM_6348_SPI_RX_TAIL,
76 + [SPI_MSG_CTL] = SPI_BCM_6348_SPI_MSG_CTL,
77 + [SPI_MSG_DATA] = SPI_BCM_6348_SPI_MSG_DATA,
78 + [SPI_RX_DATA] = SPI_BCM_6348_SPI_RX_DATA,
79 +};
80 +
81 +static const unsigned long bcm96358_regs_spi[] = {
82 + [SPI_CMD] = SPI_BCM_6358_SPI_CMD,
83 + [SPI_INT_STATUS] = SPI_BCM_6358_SPI_INT_STATUS,
84 + [SPI_INT_MASK_ST] = SPI_BCM_6358_SPI_MASK_INT_ST,
85 + [SPI_INT_MASK] = SPI_BCM_6358_SPI_INT_MASK,
86 + [SPI_ST] = SPI_BCM_6358_SPI_STATUS,
87 + [SPI_CLK_CFG] = SPI_BCM_6358_SPI_CLK_CFG,
88 + [SPI_FILL_BYTE] = SPI_BCM_6358_SPI_FILL_BYTE,
89 + [SPI_MSG_TAIL] = SPI_BCM_6358_SPI_MSG_TAIL,
90 + [SPI_RX_TAIL] = SPI_BCM_6358_SPI_RX_TAIL,
91 + [SPI_MSG_CTL] = SPI_BCM_6358_MSG_CTL,
92 + [SPI_MSG_DATA] = SPI_BCM_6358_SPI_MSG_DATA,
93 + [SPI_RX_DATA] = SPI_BCM_6358_SPI_RX_DATA,
94 +};
95 +
96 +const unsigned long *bcm63xx_regs_spi;
97 +EXPORT_SYMBOL(bcm63xx_regs_spi);
98 +
99 +static __init void bcm63xx_spi_regs_init(void)
100 +{
101 + if (BCMCPU_IS_6338())
102 + bcm63xx_regs_spi = bcm96338_regs_spi;
103 + if (BCMCPU_IS_6348())
104 + bcm63xx_regs_spi = bcm96348_regs_spi;
105 + if (BCMCPU_IS_6358())
106 + bcm63xx_regs_spi = bcm96358_regs_spi;
107 +}
108 +#else
109 +static __init void bcm63xx_spi_regs_init(void) { }
110 +#endif
111 +
112 +static struct resource spi_resources[] = {
113 + {
114 + .start = -1, /* filled at runtime */
115 + .end = -1, /* filled at runtime */
116 + .flags = IORESOURCE_MEM,
117 + },
118 + {
119 + .start = -1, /* filled at runtime */
120 + .flags = IORESOURCE_IRQ,
121 + },
122 +};
123 +
124 +static struct bcm63xx_spi_pdata spi_pdata = {
125 + .bus_num = 0,
126 + .num_chipselect = 8,
127 + .speed_hz = 50000000, /* Fclk */
128 +};
129 +
130 +static struct platform_device bcm63xx_spi_device = {
131 + .name = "bcm63xx-spi",
132 + .id = 0,
133 + .num_resources = ARRAY_SIZE(spi_resources),
134 + .resource = spi_resources,
135 + .dev = {
136 + .platform_data = &spi_pdata,
137 + },
138 +};
139 +
140 +int __init bcm63xx_spi_register(void)
141 +{
142 + spi_resources[0].start = bcm63xx_regset_address(RSET_SPI);
143 + spi_resources[0].end = spi_resources[0].start;
144 + spi_resources[0].end += RSET_SPI_SIZE - 1;
145 + spi_resources[1].start = bcm63xx_get_irq_number(IRQ_SPI);
146 +
147 + /* Fill in platform data */
148 + if (BCMCPU_IS_6338() || BCMCPU_IS_6348())
149 + spi_pdata.fifo_size = SPI_BCM_6338_SPI_MSG_DATA_SIZE;
150 +
151 + if (BCMCPU_IS_6358())
152 + spi_pdata.fifo_size = SPI_BCM_6358_SPI_MSG_DATA_SIZE;
153 +
154 + bcm63xx_spi_regs_init();
155 +
156 + return platform_device_register(&bcm63xx_spi_device);
157 +}
158 --- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
159 +++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_cpu.h
160 @@ -109,6 +109,7 @@ enum bcm63xx_regs_set {
161 #define RSET_WDT_SIZE 12
162 #define RSET_ENET_SIZE 2048
163 #define RSET_ENETDMA_SIZE 2048
164 +#define RSET_SPI_SIZE 256
165 #define RSET_UART_SIZE 24
166 #define RSET_UDC_SIZE 256
167 #define RSET_OHCI_SIZE 256
168 @@ -214,7 +215,7 @@ enum bcm63xx_regs_set {
169 #define BCM_6358_UART0_BASE (0xfffe0100)
170 #define BCM_6358_UART1_BASE (0xfffe0120)
171 #define BCM_6358_GPIO_BASE (0xfffe0080)
172 -#define BCM_6358_SPI_BASE (0xdeadbeef)
173 +#define BCM_6358_SPI_BASE (0xfffe0800)
174 #define BCM_6358_UDC0_BASE (0xfffe0400)
175 #define BCM_6358_OHCI0_BASE (0xfffe1400)
176 #define BCM_6358_OHCI_PRIV_BASE (0xdeadbeef)
177 @@ -441,6 +442,7 @@ static inline unsigned long bcm63xx_regs
178 */
179 enum bcm63xx_irq {
180 IRQ_TIMER = 0,
181 + IRQ_SPI,
182 IRQ_UART0,
183 IRQ_UART1,
184 IRQ_DSL,
185 @@ -507,6 +509,7 @@ enum bcm63xx_irq {
186 * 6348 irqs
187 */
188 #define BCM_6348_TIMER_IRQ (IRQ_INTERNAL_BASE + 0)
189 +#define BCM_6348_SPI_IRQ (IRQ_INTERNAL_BASE + 1)
190 #define BCM_6348_UART0_IRQ (IRQ_INTERNAL_BASE + 2)
191 #define BCM_6348_DSL_IRQ (IRQ_INTERNAL_BASE + 4)
192 #define BCM_6348_UDC0_IRQ (IRQ_INTERNAL_BASE + 6)
193 @@ -531,6 +534,7 @@ enum bcm63xx_irq {
194 * 6358 irqs
195 */
196 #define BCM_6358_TIMER_IRQ (IRQ_INTERNAL_BASE + 0)
197 +#define BCM_6358_SPI_IRQ (IRQ_INTERNAL_BASE + 1)
198 #define BCM_6358_UART0_IRQ (IRQ_INTERNAL_BASE + 2)
199 #define BCM_6358_UART1_IRQ (IRQ_INTERNAL_BASE + 3)
200 #define BCM_6358_OHCI0_IRQ (IRQ_INTERNAL_BASE + 5)
201 --- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
202 +++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_regs.h
203 @@ -771,4 +771,116 @@
204 #define DMIPSPLLCFG_N2_SHIFT 29
205 #define DMIPSPLLCFG_N2_MASK (0x7 << DMIPSPLLCFG_N2_SHIFT)
206
207 +/*************************************************************************
208 + * _REG relative to RSET_SPI
209 + *************************************************************************/
210 +
211 +/* BCM 6338 SPI core */
212 +#define SPI_BCM_6338_SPI_CMD 0x00 /* 16-bits register */
213 +#define SPI_BCM_6338_SPI_INT_STATUS 0x02
214 +#define SPI_BCM_6338_SPI_MASK_INT_ST 0x03
215 +#define SPI_BCM_6338_SPI_INT_MASK 0x04
216 +#define SPI_BCM_6338_SPI_ST 0x05
217 +#define SPI_BCM_6338_SPI_CLK_CFG 0x06
218 +#define SPI_BCM_6338_SPI_FILL_BYTE 0x07
219 +#define SPI_BCM_6338_SPI_MSG_TAIL 0x09
220 +#define SPI_BCM_6338_SPI_RX_TAIL 0x0b
221 +#define SPI_BCM_6338_SPI_MSG_CTL 0x40
222 +#define SPI_BCM_6338_SPI_MSG_DATA 0x41
223 +#define SPI_BCM_6338_SPI_MSG_DATA_SIZE 0x3f
224 +#define SPI_BCM_6338_SPI_RX_DATA 0x80
225 +#define SPI_BCM_6338_SPI_RX_DATA_SIZE 0x3f
226 +
227 +/* BCM 6348 SPI core */
228 +#define SPI_BCM_6348_SPI_MASK_INT_ST 0x00
229 +#define SPI_BCM_6348_SPI_INT_STATUS 0x01
230 +#define SPI_BCM_6348_SPI_CMD 0x02 /* 16-bits register */
231 +#define SPI_BCM_6348_SPI_FILL_BYTE 0x04
232 +#define SPI_BCM_6348_SPI_CLK_CFG 0x05
233 +#define SPI_BCM_6348_SPI_ST 0x06
234 +#define SPI_BCM_6348_SPI_INT_MASK 0x07
235 +#define SPI_BCM_6348_SPI_RX_TAIL 0x08
236 +#define SPI_BCM_6348_SPI_MSG_TAIL 0x10
237 +#define SPI_BCM_6348_SPI_MSG_DATA 0x40
238 +#define SPI_BCM_6348_SPI_MSG_CTL 0x42
239 +#define SPI_BCM_6348_SPI_MSG_DATA_SIZE 0x3f
240 +#define SPI_BCM_6348_SPI_RX_DATA 0x80
241 +#define SPI_BCM_6348_SPI_RX_DATA_SIZE 0x3f
242 +
243 +/* BCM 6358 SPI core */
244 +#define SPI_BCM_6358_MSG_CTL 0x00 /* 16-bits register */
245 +
246 +#define SPI_BCM_6358_SPI_MSG_DATA 0x02
247 +#define SPI_BCM_6358_SPI_MSG_DATA_SIZE 0x21e
248 +
249 +#define SPI_BCM_6358_SPI_RX_DATA 0x400
250 +#define SPI_BCM_6358_SPI_RX_DATA_SIZE 0x220
251 +
252 +#define SPI_BCM_6358_SPI_CMD 0x700 /* 16-bits register */
253 +
254 +#define SPI_BCM_6358_SPI_INT_STATUS 0x702
255 +#define SPI_BCM_6358_SPI_MASK_INT_ST 0x703
256 +
257 +#define SPI_BCM_6358_SPI_INT_MASK 0x704
258 +
259 +#define SPI_BCM_6358_SPI_STATUS 0x705
260 +
261 +#define SPI_BCM_6358_SPI_CLK_CFG 0x706
262 +
263 +#define SPI_BCM_6358_SPI_FILL_BYTE 0x707
264 +#define SPI_BCM_6358_SPI_MSG_TAIL 0x709
265 +#define SPI_BCM_6358_SPI_RX_TAIL 0x70B
266 +
267 +/* Shared SPI definitions */
268 +
269 +/* Message configuration */
270 +#define SPI_FD_RW 0x00
271 +#define SPI_HD_W 0x01
272 +#define SPI_HD_R 0x02
273 +#define SPI_BYTE_CNT_SHIFT 0
274 +#define SPI_MSG_TYPE_SHIFT 14
275 +
276 +/* Command */
277 +#define SPI_CMD_NOOP 0x01
278 +#define SPI_CMD_SOFT_RESET 0x02
279 +#define SPI_CMD_HARD_RESET 0x04
280 +#define SPI_CMD_START_IMMEDIATE 0x08
281 +#define SPI_CMD_COMMAND_SHIFT 0
282 +#define SPI_CMD_COMMAND_MASK 0x000f
283 +#define SPI_CMD_DEVICE_ID_SHIFT 4
284 +#define SPI_CMD_PREPEND_BYTE_CNT_SHIFT 8
285 +#define SPI_CMD_ONE_BYTE_SHIFT 11
286 +#define SPI_CMD_ONE_WIRE_SHIFT 12
287 +#define SPI_DEV_ID_0 0
288 +#define SPI_DEV_ID_1 1
289 +#define SPI_DEV_ID_2 2
290 +#define SPI_DEV_ID_3 3
291 +
292 +/* Interrupt mask */
293 +#define SPI_INTR_CMD_DONE 0x01
294 +#define SPI_INTR_RX_OVERFLOW 0x02
295 +#define SPI_INTR_TX_UNDERFLOW 0x04
296 +#define SPI_INTR_TX_OVERFLOW 0x08
297 +#define SPI_INTR_RX_UNDERFLOW 0x10
298 +#define SPI_INTR_CLEAR_ALL 0x1f
299 +
300 +/* Status */
301 +#define SPI_RX_EMPTY 0x02
302 +#define SPI_CMD_BUSY 0x04
303 +#define SPI_SERIAL_BUSY 0x08
304 +
305 +/* Clock configuration */
306 +#define SPI_CLK_20MHZ 0x00
307 +#define SPI_CLK_0_391MHZ 0x01
308 +#define SPI_CLK_0_781MHZ 0x02 /* default */
309 +#define SPI_CLK_1_563MHZ 0x03
310 +#define SPI_CLK_3_125MHZ 0x04
311 +#define SPI_CLK_6_250MHZ 0x05
312 +#define SPI_CLK_12_50MHZ 0x06
313 +#define SPI_CLK_25MHZ 0x07
314 +#define SPI_CLK_MASK 0x07
315 +#define SPI_SSOFFTIME_MASK 0x38
316 +#define SPI_SSOFFTIME_SHIFT 3
317 +#define SPI_BYTE_SWAP 0x80
318 +
319 #endif /* BCM63XX_REGS_H_ */
320 --- /dev/null
321 +++ b/drivers/spi/bcm63xx_spi.c
322 @@ -0,0 +1,496 @@
323 +/*
324 + * Broadcom BCM63xx SPI controller support
325 + *
326 + * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
327 + * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
328 + *
329 + * This program is free software; you can redistribute it and/or
330 + * modify it under the terms of the GNU General Public License
331 + * as published by the Free Software Foundation; either version 2
332 + * of the License, or (at your option) any later version.
333 + *
334 + * This program is distributed in the hope that it will be useful,
335 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
336 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
337 + * GNU General Public License for more details.
338 + *
339 + * You should have received a copy of the GNU General Public License
340 + * along with this program; if not, write to the
341 + * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
342 + */
343 +
344 +#include <linux/kernel.h>
345 +#include <linux/init.h>
346 +#include <linux/clk.h>
347 +#include <linux/module.h>
348 +#include <linux/platform_device.h>
349 +#include <linux/delay.h>
350 +#include <linux/interrupt.h>
351 +#include <linux/spi/spi.h>
352 +#include <linux/completion.h>
353 +#include <linux/err.h>
354 +
355 +#include <bcm63xx_dev_spi.h>
356 +
357 +#define PFX KBUILD_MODNAME
358 +#define DRV_VER "0.1.2"
359 +
360 +struct bcm63xx_spi {
361 + spinlock_t lock;
362 + int stopping;
363 + struct completion done;
364 +
365 + void __iomem *regs;
366 + int irq;
367 +
368 + /* Platform data */
369 + u32 speed_hz;
370 + unsigned fifo_size;
371 +
372 + /* Data buffers */
373 + const unsigned char *tx_ptr;
374 + unsigned char *rx_ptr;
375 +
376 + /* data iomem */
377 + u8 __iomem *tx_io;
378 + const u8 __iomem *rx_io;
379 +
380 + int remaining_bytes;
381 +
382 + struct clk *clk;
383 + struct platform_device *pdev;
384 +};
385 +
386 +static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs,
387 + unsigned int offset)
388 +{
389 + return bcm_readw(bs->regs + bcm63xx_spireg(offset));
390 +}
391 +
392 +static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs,
393 + unsigned int offset)
394 +{
395 + return bcm_readw(bs->regs + bcm63xx_spireg(offset));
396 +}
397 +
398 +static inline void bcm_spi_writeb(struct bcm63xx_spi *bs,
399 + u8 value, unsigned int offset)
400 +{
401 + bcm_writeb(value, bs->regs + bcm63xx_spireg(offset));
402 +}
403 +
404 +static inline void bcm_spi_writew(struct bcm63xx_spi *bs,
405 + u16 value, unsigned int offset)
406 +{
407 + bcm_writew(value, bs->regs + bcm63xx_spireg(offset));
408 +}
409 +
410 +static int bcm63xx_spi_setup_transfer(struct spi_device *spi,
411 + struct spi_transfer *t)
412 +{
413 + u8 bits_per_word;
414 + u8 clk_cfg;
415 + u32 hz;
416 + unsigned int div;
417 +
418 + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
419 +
420 + bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
421 + hz = (t) ? t->speed_hz : spi->max_speed_hz;
422 + if (bits_per_word != 8) {
423 + dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
424 + __func__, bits_per_word);
425 + return -EINVAL;
426 + }
427 +
428 + if (spi->chip_select > spi->master->num_chipselect) {
429 + dev_err(&spi->dev, "%s, unsupported slave %d\n",
430 + __func__, spi->chip_select);
431 + return -EINVAL;
432 + }
433 +
434 + /* Check clock setting */
435 + div = (bs->speed_hz / hz);
436 + switch (div) {
437 + case 2:
438 + clk_cfg = SPI_CLK_25MHZ;
439 + break;
440 + case 4:
441 + clk_cfg = SPI_CLK_12_50MHZ;
442 + break;
443 + case 8:
444 + clk_cfg = SPI_CLK_6_250MHZ;
445 + break;
446 + case 16:
447 + clk_cfg = SPI_CLK_3_125MHZ;
448 + break;
449 + case 32:
450 + clk_cfg = SPI_CLK_1_563MHZ;
451 + break;
452 + case 64:
453 + clk_cfg = SPI_CLK_0_781MHZ;
454 + break;
455 + case 128:
456 + default:
457 + /* Set to slowest mode for compatibility */
458 + clk_cfg = SPI_CLK_0_391MHZ;
459 + break;
460 + }
461 +
462 + bcm_spi_writeb(bs, clk_cfg, SPI_CLK_CFG);
463 + dev_dbg(&spi->dev, "Setting clock register to %d (hz %d, cmd %02x)\n",
464 + div, hz, clk_cfg);
465 +
466 + return 0;
467 +}
468 +
469 +/* the spi->mode bits understood by this driver: */
470 +#define MODEBITS (SPI_CPOL | SPI_CPHA)
471 +
472 +static int bcm63xx_spi_setup(struct spi_device *spi)
473 +{
474 + struct bcm63xx_spi *bs;
475 + int ret;
476 +
477 + bs = spi_master_get_devdata(spi->master);
478 +
479 + if (bs->stopping)
480 + return -ESHUTDOWN;
481 +
482 + if (!spi->bits_per_word)
483 + spi->bits_per_word = 8;
484 +
485 + if (spi->mode & ~MODEBITS) {
486 + dev_err(&spi->dev, "%s, unsupported mode bits %x\n",
487 + __func__, spi->mode & ~MODEBITS);
488 + return -EINVAL;
489 + }
490 +
491 + ret = bcm63xx_spi_setup_transfer(spi, NULL);
492 + if (ret < 0) {
493 + dev_err(&spi->dev, "setup: unsupported mode bits %x\n",
494 + spi->mode & ~MODEBITS);
495 + return ret;
496 + }
497 +
498 + dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n",
499 + __func__, spi->mode & MODEBITS, spi->bits_per_word, 0);
500 +
501 + return 0;
502 +}
503 +
504 +/* Fill the TX FIFO with as many bytes as possible */
505 +static void bcm63xx_spi_fill_tx_fifo(struct bcm63xx_spi *bs)
506 +{
507 + u8 size;
508 +
509 + /* Fill the Tx FIFO with as many bytes as possible */
510 + size = bs->remaining_bytes < bs->fifo_size ? bs->remaining_bytes :
511 + bs->fifo_size;
512 + memcpy_toio(bs->tx_io, bs->tx_ptr, size);
513 + bs->remaining_bytes -= size;
514 +}
515 +
516 +static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
517 +{
518 + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
519 + u16 msg_ctl;
520 + u16 cmd;
521 +
522 + dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
523 + t->tx_buf, t->rx_buf, t->len);
524 +
525 + /* Transmitter is inhibited */
526 + bs->tx_ptr = t->tx_buf;
527 + bs->rx_ptr = t->rx_buf;
528 + init_completion(&bs->done);
529 +
530 + if (t->tx_buf) {
531 + bs->remaining_bytes = t->len;
532 + bcm63xx_spi_fill_tx_fifo(bs);
533 + }
534 +
535 + /* Enable the command done interrupt which
536 + * we use to determine completion of a command */
537 + bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
538 +
539 + /* Fill in the Message control register */
540 + msg_ctl = (t->len << SPI_BYTE_CNT_SHIFT);
541 +
542 + if (t->rx_buf && t->tx_buf)
543 + msg_ctl |= (SPI_FD_RW << SPI_MSG_TYPE_SHIFT);
544 + else if (t->rx_buf)
545 + msg_ctl |= (SPI_HD_R << SPI_MSG_TYPE_SHIFT);
546 + else if (t->tx_buf)
547 + msg_ctl |= (SPI_HD_W << SPI_MSG_TYPE_SHIFT);
548 +
549 + bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL);
550 +
551 + /* Issue the transfer */
552 + cmd = SPI_CMD_START_IMMEDIATE;
553 + cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
554 + cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT);
555 + bcm_spi_writew(bs, cmd, SPI_CMD);
556 + wait_for_completion(&bs->done);
557 +
558 + /* Disable the CMD_DONE interrupt */
559 + bcm_spi_writeb(bs, 0, SPI_INT_MASK);
560 +
561 + return t->len - bs->remaining_bytes;
562 +}
563 +
564 +static int bcm63xx_transfer(struct spi_device *spi, struct spi_message *m)
565 +{
566 + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master);
567 + struct spi_transfer *t;
568 + int ret = 0;
569 +
570 + if (unlikely(list_empty(&m->transfers)))
571 + return -EINVAL;
572 +
573 + if (bs->stopping)
574 + return -ESHUTDOWN;
575 +
576 + list_for_each_entry(t, &m->transfers, transfer_list) {
577 + ret += bcm63xx_txrx_bufs(spi, t);
578 + }
579 +
580 + m->complete(m->context);
581 +
582 + return ret;
583 +}
584 +
585 +/* This driver supports single master mode only. Hence
586 + * CMD_DONE is the only interrupt we care about
587 + */
588 +static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id)
589 +{
590 + struct spi_master *master = (struct spi_master *)dev_id;
591 + struct bcm63xx_spi *bs = spi_master_get_devdata(master);
592 + u8 intr;
593 + u16 cmd;
594 +
595 + /* Read interupts and clear them immediately */
596 + intr = bcm_spi_readb(bs, SPI_INT_STATUS);
597 + bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
598 + bcm_spi_writeb(bs, 0, SPI_INT_MASK);
599 +
600 + /* A tansfer completed */
601 + if (intr & SPI_INTR_CMD_DONE) {
602 + u8 rx_tail;
603 +
604 + rx_tail = bcm_spi_readb(bs, SPI_RX_TAIL);
605 +
606 + /* Read out all the data */
607 + if (rx_tail)
608 + memcpy_fromio(bs->rx_ptr, bs->rx_io, rx_tail);
609 +
610 + /* See if there is more data to send */
611 + if (bs->remaining_bytes > 0) {
612 + bcm63xx_spi_fill_tx_fifo(bs);
613 +
614 + /* Start the transfer */
615 + bcm_spi_writew(bs, SPI_HD_W << SPI_MSG_TYPE_SHIFT,
616 + SPI_MSG_CTL);
617 + cmd = bcm_spi_readw(bs, SPI_CMD);
618 + cmd |= SPI_CMD_START_IMMEDIATE;
619 + cmd |= (0 << SPI_CMD_PREPEND_BYTE_CNT_SHIFT);
620 + bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK);
621 + bcm_spi_writew(bs, cmd, SPI_CMD);
622 + } else {
623 + complete(&bs->done);
624 + }
625 + }
626 +
627 + return IRQ_HANDLED;
628 +}
629 +
630 +
631 +static int __init bcm63xx_spi_probe(struct platform_device *pdev)
632 +{
633 + struct resource *r;
634 + struct device *dev = &pdev->dev;
635 + struct bcm63xx_spi_pdata *pdata = pdev->dev.platform_data;
636 + int irq;
637 + struct spi_master *master;
638 + struct clk *clk;
639 + struct bcm63xx_spi *bs;
640 + int ret;
641 +
642 + r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
643 + if (!r) {
644 + dev_err(dev, "no iomem\n");
645 + ret = -ENXIO;
646 + goto out;
647 + }
648 +
649 + irq = platform_get_irq(pdev, 0);
650 + if (irq < 0) {
651 + dev_err(dev, "no irq\n");
652 + ret = -ENXIO;
653 + goto out;
654 + }
655 +
656 + clk = clk_get(dev, "spi");
657 + if (IS_ERR(clk)) {
658 + dev_err(dev, "no clock for device\n");
659 + ret = -ENODEV;
660 + goto out;
661 + }
662 +
663 + master = spi_alloc_master(dev, sizeof(*bs));
664 + if (!master) {
665 + dev_err(dev, "out of memory\n");
666 + ret = -ENOMEM;
667 + goto out_free;
668 + }
669 +
670 + bs = spi_master_get_devdata(master);
671 + init_completion(&bs->done);
672 +
673 + platform_set_drvdata(pdev, master);
674 + bs->pdev = pdev;
675 +
676 + if (!request_mem_region(r->start, r->end - r->start, PFX)) {
677 + dev_err(dev, "iomem request failed\n");
678 + ret = -ENXIO;
679 + goto out_put_master;
680 + }
681 +
682 + bs->regs = ioremap_nocache(r->start, r->end - r->start);
683 + if (!bs->regs) {
684 + dev_err(dev, "unable to ioremap regs\n");
685 + ret = -ENOMEM;
686 + goto out_put_master;
687 + }
688 + bs->irq = irq;
689 + bs->clk = clk;
690 + bs->fifo_size = pdata->fifo_size;
691 +
692 + ret = request_irq(irq, bcm63xx_spi_interrupt, 0, pdev->name, master);
693 + if (ret) {
694 + dev_err(dev, "unable to request irq\n");
695 + goto out_unmap;
696 + }
697 +
698 + master->bus_num = pdata->bus_num;
699 + master->num_chipselect = pdata->num_chipselect;
700 + master->setup = bcm63xx_spi_setup;
701 + master->transfer = bcm63xx_transfer;
702 + bs->speed_hz = pdata->speed_hz;
703 + bs->stopping = 0;
704 + bs->tx_io = (u8*)(bs->regs + bcm63xx_spireg(SPI_MSG_DATA));
705 + bs->rx_io = (const u8*)(bs->regs + bcm63xx_spireg(SPI_RX_DATA));
706 + spin_lock_init(&bs->lock);
707 +
708 + /* Initialize hardware */
709 + clk_enable(bs->clk);
710 + bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS);
711 +
712 + /* register and we are done */
713 + ret = spi_register_master(master);
714 + if (ret) {
715 + dev_err(dev, "spi register failed\n");
716 + goto out_reset_hw;
717 + }
718 +
719 + dev_info(dev, "at 0x%08x (irq %d, FIFOs size %d) v%s\n",
720 + r->start, irq, bs->fifo_size, DRV_VER);
721 +
722 + return 0;
723 +
724 +out_reset_hw:
725 + clk_disable(clk);
726 + free_irq(irq, master);
727 +out_unmap:
728 + iounmap(bs->regs);
729 +out_put_master:
730 + spi_master_put(master);
731 +out_free:
732 + clk_put(clk);
733 +out:
734 + return ret;
735 +}
736 +
737 +static int __exit bcm63xx_spi_remove(struct platform_device *pdev)
738 +{
739 + struct spi_master *master = platform_get_drvdata(pdev);
740 + struct bcm63xx_spi *bs = spi_master_get_devdata(master);
741 + struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
742 +
743 + /* reset spi block */
744 + bcm_spi_writeb(bs, 0, SPI_INT_MASK);
745 + spin_lock(&bs->lock);
746 + bs->stopping = 1;
747 +
748 + /* HW shutdown */
749 + clk_disable(bs->clk);
750 + clk_put(bs->clk);
751 +
752 + spin_unlock(&bs->lock);
753 +
754 + free_irq(bs->irq, master);
755 + iounmap(bs->regs);
756 + release_mem_region(r->start, r->end - r->start);
757 + platform_set_drvdata(pdev, 0);
758 + spi_unregister_master(master);
759 +
760 + return 0;
761 +}
762 +
763 +#ifdef CONFIG_PM
764 +static int bcm63xx_spi_suspend(struct platform_device *pdev, pm_message_t mesg)
765 +{
766 + struct spi_master *master = platform_get_drvdata(pdev);
767 + struct bcm63xx_spi *bs = spi_master_get_devdata(master);
768 +
769 + clk_disable(bs->clk);
770 +
771 + return 0;
772 +}
773 +
774 +static int bcm63xx_spi_resume(struct platform_device *pdev)
775 +{
776 + struct spi_master *master = platform_get_drvdata(pdev);
777 + struct bcm63xx_spi *bs = spi_master_get_devdata(master);
778 +
779 + clk_enable(bs->clk);
780 +
781 + return 0;
782 +}
783 +#else
784 +#define bcm63xx_spi_suspend NULL
785 +#define bcm63xx_spi_resume NULL
786 +#endif
787 +
788 +static struct platform_driver bcm63xx_spi_driver = {
789 + .driver = {
790 + .name = "bcm63xx-spi",
791 + .owner = THIS_MODULE,
792 + },
793 + .probe = bcm63xx_spi_probe,
794 + .remove = __exit_p(bcm63xx_spi_remove),
795 + .suspend = bcm63xx_spi_suspend,
796 + .resume = bcm63xx_spi_resume,
797 +};
798 +
799 +
800 +static int __init bcm63xx_spi_init(void)
801 +{
802 + return platform_driver_register(&bcm63xx_spi_driver);
803 +}
804 +
805 +static void __exit bcm63xx_spi_exit(void)
806 +{
807 + platform_driver_unregister(&bcm63xx_spi_driver);
808 +}
809 +
810 +module_init(bcm63xx_spi_init);
811 +module_exit(bcm63xx_spi_exit);
812 +
813 +MODULE_ALIAS("platform:bcm63xx_spi");
814 +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
815 +MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>");
816 +MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver");
817 +MODULE_LICENSE("GPL");
818 +MODULE_VERSION(DRV_VER);
819 --- a/drivers/spi/Kconfig
820 +++ b/drivers/spi/Kconfig
821 @@ -68,6 +68,12 @@ config SPI_ATMEL
822 This selects a driver for the Atmel SPI Controller, present on
823 many AT32 (AVR32) and AT91 (ARM) chips.
824
825 +config SPI_BCM63XX
826 + tristate "Broadcom BCM63xx SPI controller"
827 + depends on BCM63XX
828 + help
829 + This is the SPI controller master driver for Broadcom BCM63xx SoC.
830 +
831 config SPI_BFIN
832 tristate "SPI controller driver for ADI Blackfin5xx"
833 depends on BLACKFIN
834 --- a/drivers/spi/Makefile
835 +++ b/drivers/spi/Makefile
836 @@ -51,6 +51,7 @@ obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.
837 obj-$(CONFIG_SPI_SH_MSIOF) += spi_sh_msiof.o
838 obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o
839 obj-$(CONFIG_SPI_NUC900) += spi_nuc900.o
840 +obj-$(CONFIG_SPI_BCM63XX) += bcm63xx_spi.o
841
842 # special build for s3c24xx spi driver with fiq support
843 spi_s3c24xx_hw-y := spi_s3c24xx.o
844 --- /dev/null
845 +++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_dev_spi.h
846 @@ -0,0 +1,126 @@
847 +#ifndef BCM63XX_DEV_SPI_H
848 +#define BCM63XX_DEV_SPI_H
849 +
850 +#include <linux/types.h>
851 +#include <bcm63xx_io.h>
852 +#include <bcm63xx_regs.h>
853 +
854 +int __init bcm63xx_spi_register(void);
855 +
856 +struct bcm63xx_spi_pdata {
857 + unsigned int fifo_size;
858 + int bus_num;
859 + int num_chipselect;
860 + u32 speed_hz;
861 +};
862 +
863 +enum bcm63xx_regs_spi {
864 + SPI_CMD,
865 + SPI_INT_STATUS,
866 + SPI_INT_MASK_ST,
867 + SPI_INT_MASK,
868 + SPI_ST,
869 + SPI_CLK_CFG,
870 + SPI_FILL_BYTE,
871 + SPI_MSG_TAIL,
872 + SPI_RX_TAIL,
873 + SPI_MSG_CTL,
874 + SPI_MSG_DATA,
875 + SPI_RX_DATA,
876 +};
877 +
878 +static inline unsigned long bcm63xx_spireg(enum bcm63xx_regs_spi reg)
879 +{
880 +#ifdef BCMCPU_RUNTIME_DETECT
881 + extern const unsigned long *bcm63xx_regs_spi;
882 + return bcm63xx_regs_spi[reg];
883 +#else
884 +#ifdef CONFIG_BCM63XX_CPU_6338
885 +switch (reg) {
886 + case SPI_CMD:
887 + return SPI_BCM_6338_SPI_CMD;
888 + case SPI_INT_STATUS:
889 + return SPI_BCM_6338_SPI_INT_STATUS;
890 + case SPI_INT_MASK_ST:
891 + return SPI_BCM_6338_SPI_MASK_INT_ST;
892 + case SPI_INT_MASK:
893 + return SPI_BCM_6338_SPI_INT_MASK;
894 + case SPI_ST:
895 + return SPI_BCM_6338_SPI_ST;
896 + case SPI_CLK_CFG:
897 + return SPI_BCM_6338_SPI_CLK_CFG;
898 + case SPI_FILL_BYTE:
899 + return SPI_BCM_6338_SPI_FILL_BYTE;
900 + case SPI_MSG_TAIL:
901 + return SPI_BCM_6338_SPI_MSG_TAIL;
902 + case SPI_RX_TAIL:
903 + return SPI_BCM_6338_SPI_RX_TAIL;
904 + case SPI_MSG_CTL:
905 + return SPI_BCM_6338_SPI_MSG_CTL;
906 + case SPI_MSG_DATA:
907 + return SPI_BCM_6338_SPI_MSG_DATA;
908 + case SPI_RX_DATA:
909 + return SPI_BCM_6338_SPI_RX_DATA;
910 +}
911 +#endif
912 +#ifdef CONFIG_BCM63XX_CPU_6348
913 +switch (reg) {
914 + case SPI_CMD:
915 + return SPI_BCM_6348_SPI_CMD;
916 + case SPI_INT_MASK_ST:
917 + return SPI_BCM_6348_SPI_MASK_INT_ST;
918 + case SPI_INT_MASK:
919 + return SPI_BCM_6348_SPI_INT_MASK;
920 + case SPI_INT_STATUS:
921 + return SPI_BCM_6348_SPI_INT_STATUS;
922 + case SPI_ST:
923 + return SPI_BCM_6348_SPI_ST;
924 + case SPI_CLK_CFG:
925 + return SPI_BCM_6348_SPI_CLK_CFG;
926 + case SPI_FILL_BYTE:
927 + return SPI_BCM_6348_SPI_FILL_BYTE;
928 + case SPI_MSG_TAIL:
929 + return SPI_BCM_6348_SPI_MSG_TAIL;
930 + case SPI_RX_TAIL:
931 + return SPI_BCM_6348_SPI_RX_TAIL;
932 + case SPI_MSG_CTL:
933 + return SPI_BCM_6348_SPI_MSG_CTL;
934 + case SPI_MSG_DATA:
935 + return SPI_BCM_6348_SPI_MSG_DATA;
936 + case SPI_RX_DATA:
937 + return SPI_BCM_6348_SPI_RX_DATA;
938 +}
939 +#endif
940 +#ifdef CONFIG_BCM63XX_CPU_6358
941 +switch (reg) {
942 + case SPI_CMD:
943 + return SPI_BCM_6358_SPI_CMD;
944 + case SPI_INT_STATUS:
945 + return SPI_BCM_6358_SPI_INT_STATUS;
946 + case SPI_INT_MASK_ST:
947 + return SPI_BCM_6358_SPI_MASK_INT_ST;
948 + case SPI_INT_MASK:
949 + return SPI_BCM_6358_SPI_INT_MASK;
950 + case SPI_ST:
951 + return SPI_BCM_6358_SPI_STATUS;
952 + case SPI_CLK_CFG:
953 + return SPI_BCM_6358_SPI_CLK_CFG;
954 + case SPI_FILL_BYTE:
955 + return SPI_BCM_6358_SPI_FILL_BYTE;
956 + case SPI_MSG_TAIL:
957 + return SPI_BCM_6358_SPI_MSG_TAIL;
958 + case SPI_RX_TAIL:
959 + return SPI_BCM_6358_SPI_RX_TAIL;
960 + case SPI_MSG_CTL:
961 + return SPI_BCM_6358_MSG_CTL;
962 + case SPI_MSG_DATA:
963 + return SPI_BCM_6358_SPI_MSG_DATA;
964 + case SPI_RX_DATA:
965 + return SPI_BCM_6358_SPI_RX_DATA;
966 +}
967 +#endif
968 +#endif
969 + return 0;
970 +}
971 +
972 +#endif /* BCM63XX_DEV_SPI_H */
973 --- a/arch/mips/bcm63xx/Makefile
974 +++ b/arch/mips/bcm63xx/Makefile
975 @@ -1,6 +1,6 @@
976 obj-y += clk.o cpu.o cs.o gpio.o irq.o prom.o setup.o timer.o \
977 dev-dsp.o dev-enet.o dev-pcmcia.o dev-uart.o dev-wdt.o \
978 - dev-usb-ohci.o dev-usb-ehci.o dev-usb-udc.o
979 + dev-usb-ohci.o dev-usb-ehci.o dev-usb-udc.o dev-spi.o
980 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
981
982 obj-y += boards/
983 --- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
984 +++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
985 @@ -30,6 +30,7 @@
986 #include <bcm63xx_dev_usb_ohci.h>
987 #include <bcm63xx_dev_usb_ehci.h>
988 #include <bcm63xx_dev_usb_udc.h>
989 +#include <bcm63xx_dev_spi.h>
990 #include <board_bcm963xx.h>
991
992 #define PFX "board_bcm963xx: "
993 @@ -931,6 +932,9 @@ int __init board_register_devices(void)
994 if (board.num_spis)
995 spi_register_board_info(board.spis, board.num_spis);
996
997 + if (!BCMCPU_IS_6345())
998 + bcm63xx_spi_register();
999 +
1000 /* read base address of boot chip select (0) */
1001 if (BCMCPU_IS_6345())
1002 val = 0x1fc00000;
Personal OpenWRT clone
This page took 0.103745 seconds and 3 git commands to generate.