1 /*
2 * GPMC support functions
3 *
4 * Copyright (C) 2005-2006 Nokia Corporation
5 *
6 * Author: Juha Yrjola
7 *
8 * Copyright (C) 2009 Texas Instruments
9 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15 #undef DEBUG
16
17 #include <linux/irq.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/err.h>
21 #include <linux/clk.h>
22 #include <linux/ioport.h>
23 #include <linux/spinlock.h>
24 #include <linux/io.h>
25 #include <linux/module.h>
26 #include <linux/interrupt.h>
27
28 #include <asm/mach-types.h>
29 #include <plat/gpmc.h>
30
31 #include <plat/sdrc.h>
32
33 /* GPMC register offsets */
34 #define GPMC_REVISION 0x00
35 #define GPMC_SYSCONFIG 0x10
36 #define GPMC_SYSSTATUS 0x14
37 #define GPMC_IRQSTATUS 0x18
38 #define GPMC_IRQENABLE 0x1c
39 #define GPMC_TIMEOUT_CONTROL 0x40
40 #define GPMC_ERR_ADDRESS 0x44
41 #define GPMC_ERR_TYPE 0x48
42 #define GPMC_CONFIG 0x50
43 #define GPMC_STATUS 0x54
44 #define GPMC_PREFETCH_CONFIG1 0x1e0
45 #define GPMC_PREFETCH_CONFIG2 0x1e4
46 #define GPMC_PREFETCH_CONTROL 0x1ec
47 #define GPMC_PREFETCH_STATUS 0x1f0
48 #define GPMC_ECC_CONFIG 0x1f4
49 #define GPMC_ECC_CONTROL 0x1f8
50 #define GPMC_ECC_SIZE_CONFIG 0x1fc
51 #define GPMC_ECC1_RESULT 0x200
52
53 #define GPMC_CS0_OFFSET 0x60
54 #define GPMC_CS_SIZE 0x30
55
56 #define GPMC_MEM_START 0x00000000
57 #define GPMC_MEM_END 0x3FFFFFFF
58 #define BOOT_ROM_SPACE 0x100000 /* 1MB */
59
60 #define GPMC_CHUNK_SHIFT 24 /* 16 MB */
61 #define GPMC_SECTION_SHIFT 28 /* 128 MB */
62
63 #define CS_NUM_SHIFT 24
64 #define ENABLE_PREFETCH (0x1 << 7)
65 #define DMA_MPU_MODE 2
66
67 /* Structure to save gpmc cs context */
68 struct gpmc_cs_config {
69 u32 config1;
70 u32 config2;
71 u32 config3;
72 u32 config4;
73 u32 config5;
74 u32 config6;
75 u32 config7;
76 int is_valid;
77 };
78
79 /*
80 * Structure to save/restore gpmc context
81 * to support core off on OMAP3
82 */
83 struct omap3_gpmc_regs {
84 u32 sysconfig;
85 u32 irqenable;
86 u32 timeout_ctrl;
87 u32 config;
88 u32 prefetch_config1;
89 u32 prefetch_config2;
90 u32 prefetch_control;
91 struct gpmc_cs_config cs_context[GPMC_CS_NUM];
92 };
93
94 static struct resource gpmc_mem_root;
95 static struct resource gpmc_cs_mem[GPMC_CS_NUM];
96 static DEFINE_SPINLOCK(gpmc_mem_lock);
97 static unsigned int gpmc_cs_map; /* flag for cs which are initialized */
98 static int gpmc_ecc_used = -EINVAL; /* cs using ecc engine */
99
100 static void __iomem *gpmc_base;
101
102 static struct clk *gpmc_l3_clk;
103
104 static irqreturn_t gpmc_handle_irq(int irq, void *dev);
105
gpmc_write_reg(int idx,u32 val)106 static void gpmc_write_reg(int idx, u32 val)
107 {
108 __raw_writel(val, gpmc_base + idx);
109 }
110
gpmc_read_reg(int idx)111 static u32 gpmc_read_reg(int idx)
112 {
113 return __raw_readl(gpmc_base + idx);
114 }
115
gpmc_cs_write_byte(int cs,int idx,u8 val)116 static void gpmc_cs_write_byte(int cs, int idx, u8 val)
117 {
118 void __iomem *reg_addr;
119
120 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
121 __raw_writeb(val, reg_addr);
122 }
123
gpmc_cs_read_byte(int cs,int idx)124 static u8 gpmc_cs_read_byte(int cs, int idx)
125 {
126 void __iomem *reg_addr;
127
128 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
129 return __raw_readb(reg_addr);
130 }
131
gpmc_cs_write_reg(int cs,int idx,u32 val)132 void gpmc_cs_write_reg(int cs, int idx, u32 val)
133 {
134 void __iomem *reg_addr;
135
136 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
137 __raw_writel(val, reg_addr);
138 }
139
gpmc_cs_read_reg(int cs,int idx)140 u32 gpmc_cs_read_reg(int cs, int idx)
141 {
142 void __iomem *reg_addr;
143
144 reg_addr = gpmc_base + GPMC_CS0_OFFSET + (cs * GPMC_CS_SIZE) + idx;
145 return __raw_readl(reg_addr);
146 }
147
148 /* TODO: Add support for gpmc_fck to clock framework and use it */
gpmc_get_fclk_period(void)149 unsigned long gpmc_get_fclk_period(void)
150 {
151 unsigned long rate = clk_get_rate(gpmc_l3_clk);
152
153 if (rate == 0) {
154 printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
155 return 0;
156 }
157
158 rate /= 1000;
159 rate = 1000000000 / rate; /* In picoseconds */
160
161 return rate;
162 }
163
gpmc_ns_to_ticks(unsigned int time_ns)164 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
165 {
166 unsigned long tick_ps;
167
168 /* Calculate in picosecs to yield more exact results */
169 tick_ps = gpmc_get_fclk_period();
170
171 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
172 }
173
gpmc_ps_to_ticks(unsigned int time_ps)174 unsigned int gpmc_ps_to_ticks(unsigned int time_ps)
175 {
176 unsigned long tick_ps;
177
178 /* Calculate in picosecs to yield more exact results */
179 tick_ps = gpmc_get_fclk_period();
180
181 return (time_ps + tick_ps - 1) / tick_ps;
182 }
183
gpmc_ticks_to_ns(unsigned int ticks)184 unsigned int gpmc_ticks_to_ns(unsigned int ticks)
185 {
186 return ticks * gpmc_get_fclk_period() / 1000;
187 }
188
gpmc_round_ns_to_ticks(unsigned int time_ns)189 unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
190 {
191 unsigned long ticks = gpmc_ns_to_ticks(time_ns);
192
193 return ticks * gpmc_get_fclk_period() / 1000;
194 }
195
196 #ifdef DEBUG
set_gpmc_timing_reg(int cs,int reg,int st_bit,int end_bit,int time,const char * name)197 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
198 int time, const char *name)
199 #else
200 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
201 int time)
202 #endif
203 {
204 u32 l;
205 int ticks, mask, nr_bits;
206
207 if (time == 0)
208 ticks = 0;
209 else
210 ticks = gpmc_ns_to_ticks(time);
211 nr_bits = end_bit - st_bit + 1;
212 if (ticks >= 1 << nr_bits) {
213 #ifdef DEBUG
214 printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
215 cs, name, time, ticks, 1 << nr_bits);
216 #endif
217 return -1;
218 }
219
220 mask = (1 << nr_bits) - 1;
221 l = gpmc_cs_read_reg(cs, reg);
222 #ifdef DEBUG
223 printk(KERN_INFO
224 "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
225 cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
226 (l >> st_bit) & mask, time);
227 #endif
228 l &= ~(mask << st_bit);
229 l |= ticks << st_bit;
230 gpmc_cs_write_reg(cs, reg, l);
231
232 return 0;
233 }
234
235 #ifdef DEBUG
236 #define GPMC_SET_ONE(reg, st, end, field) \
237 if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
238 t->field, #field) < 0) \
239 return -1
240 #else
241 #define GPMC_SET_ONE(reg, st, end, field) \
242 if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
243 return -1
244 #endif
245
gpmc_cs_calc_divider(int cs,unsigned int sync_clk)246 int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
247 {
248 int div;
249 u32 l;
250
251 l = sync_clk + (gpmc_get_fclk_period() - 1);
252 div = l / gpmc_get_fclk_period();
253 if (div > 4)
254 return -1;
255 if (div <= 0)
256 div = 1;
257
258 return div;
259 }
260
gpmc_cs_set_timings(int cs,const struct gpmc_timings * t)261 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
262 {
263 int div;
264 u32 l;
265
266 div = gpmc_cs_calc_divider(cs, t->sync_clk);
267 if (div < 0)
268 return -1;
269
270 GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
271 GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
272 GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
273
274 GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
275 GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
276 GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
277
278 GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
279 GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
280 GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
281 GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
282
283 GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
284 GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
285 GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
286
287 GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
288
289 if (cpu_is_omap34xx()) {
290 GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
291 GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
292 }
293
294 /* caller is expected to have initialized CONFIG1 to cover
295 * at least sync vs async
296 */
297 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
298 if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
299 #ifdef DEBUG
300 printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
301 cs, (div * gpmc_get_fclk_period()) / 1000, div);
302 #endif
303 l &= ~0x03;
304 l |= (div - 1);
305 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
306 }
307
308 return 0;
309 }
310
gpmc_cs_enable_mem(int cs,u32 base,u32 size)311 static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
312 {
313 u32 l;
314 u32 mask;
315
316 mask = (1 << GPMC_SECTION_SHIFT) - size;
317 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
318 l &= ~0x3f;
319 l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
320 l &= ~(0x0f << 8);
321 l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
322 l |= GPMC_CONFIG7_CSVALID;
323 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
324 }
325
gpmc_cs_disable_mem(int cs)326 static void gpmc_cs_disable_mem(int cs)
327 {
328 u32 l;
329
330 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
331 l &= ~GPMC_CONFIG7_CSVALID;
332 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
333 }
334
gpmc_cs_get_memconf(int cs,u32 * base,u32 * size)335 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
336 {
337 u32 l;
338 u32 mask;
339
340 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
341 *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
342 mask = (l >> 8) & 0x0f;
343 *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
344 }
345
gpmc_cs_mem_enabled(int cs)346 static int gpmc_cs_mem_enabled(int cs)
347 {
348 u32 l;
349
350 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
351 return l & GPMC_CONFIG7_CSVALID;
352 }
353
gpmc_cs_set_reserved(int cs,int reserved)354 int gpmc_cs_set_reserved(int cs, int reserved)
355 {
356 if (cs > GPMC_CS_NUM)
357 return -ENODEV;
358
359 gpmc_cs_map &= ~(1 << cs);
360 gpmc_cs_map |= (reserved ? 1 : 0) << cs;
361
362 return 0;
363 }
364
gpmc_cs_reserved(int cs)365 int gpmc_cs_reserved(int cs)
366 {
367 if (cs > GPMC_CS_NUM)
368 return -ENODEV;
369
370 return gpmc_cs_map & (1 << cs);
371 }
372
gpmc_mem_align(unsigned long size)373 static unsigned long gpmc_mem_align(unsigned long size)
374 {
375 int order;
376
377 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
378 order = GPMC_CHUNK_SHIFT - 1;
379 do {
380 size >>= 1;
381 order++;
382 } while (size);
383 size = 1 << order;
384 return size;
385 }
386
gpmc_cs_insert_mem(int cs,unsigned long base,unsigned long size)387 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
388 {
389 struct resource *res = &gpmc_cs_mem[cs];
390 int r;
391
392 size = gpmc_mem_align(size);
393 spin_lock(&gpmc_mem_lock);
394 res->start = base;
395 res->end = base + size - 1;
396 r = request_resource(&gpmc_mem_root, res);
397 spin_unlock(&gpmc_mem_lock);
398
399 return r;
400 }
401
gpmc_cs_request(int cs,unsigned long size,unsigned long * base)402 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
403 {
404 struct resource *res = &gpmc_cs_mem[cs];
405 int r = -1;
406
407 if (cs > GPMC_CS_NUM)
408 return -ENODEV;
409
410 size = gpmc_mem_align(size);
411 if (size > (1 << GPMC_SECTION_SHIFT))
412 return -ENOMEM;
413
414 spin_lock(&gpmc_mem_lock);
415 if (gpmc_cs_reserved(cs)) {
416 r = -EBUSY;
417 goto out;
418 }
419 if (gpmc_cs_mem_enabled(cs))
420 r = adjust_resource(res, res->start & ~(size - 1), size);
421 if (r < 0)
422 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
423 size, NULL, NULL);
424 if (r < 0)
425 goto out;
426
427 gpmc_cs_enable_mem(cs, res->start, resource_size(res));
428 *base = res->start;
429 gpmc_cs_set_reserved(cs, 1);
430 out:
431 spin_unlock(&gpmc_mem_lock);
432 return r;
433 }
434 EXPORT_SYMBOL(gpmc_cs_request);
435
gpmc_cs_free(int cs)436 void gpmc_cs_free(int cs)
437 {
438 spin_lock(&gpmc_mem_lock);
439 if (cs >= GPMC_CS_NUM || cs < 0 || !gpmc_cs_reserved(cs)) {
440 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
441 BUG();
442 spin_unlock(&gpmc_mem_lock);
443 return;
444 }
445 gpmc_cs_disable_mem(cs);
446 release_resource(&gpmc_cs_mem[cs]);
447 gpmc_cs_set_reserved(cs, 0);
448 spin_unlock(&gpmc_mem_lock);
449 }
450 EXPORT_SYMBOL(gpmc_cs_free);
451
452 /**
453 * gpmc_read_status - read access request to get the different gpmc status
454 * @cmd: command type
455 * @return status
456 */
gpmc_read_status(int cmd)457 int gpmc_read_status(int cmd)
458 {
459 int status = -EINVAL;
460 u32 regval = 0;
461
462 switch (cmd) {
463 case GPMC_GET_IRQ_STATUS:
464 status = gpmc_read_reg(GPMC_IRQSTATUS);
465 break;
466
467 case GPMC_PREFETCH_FIFO_CNT:
468 regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
469 status = GPMC_PREFETCH_STATUS_FIFO_CNT(regval);
470 break;
471
472 case GPMC_PREFETCH_COUNT:
473 regval = gpmc_read_reg(GPMC_PREFETCH_STATUS);
474 status = GPMC_PREFETCH_STATUS_COUNT(regval);
475 break;
476
477 case GPMC_STATUS_BUFFER:
478 regval = gpmc_read_reg(GPMC_STATUS);
479 /* 1 : buffer is available to write */
480 status = regval & GPMC_STATUS_BUFF_EMPTY;
481 break;
482
483 default:
484 printk(KERN_ERR "gpmc_read_status: Not supported\n");
485 }
486 return status;
487 }
488 EXPORT_SYMBOL(gpmc_read_status);
489
490 /**
491 * gpmc_cs_configure - write request to configure gpmc
492 * @cs: chip select number
493 * @cmd: command type
494 * @wval: value to write
495 * @return status of the operation
496 */
gpmc_cs_configure(int cs,int cmd,int wval)497 int gpmc_cs_configure(int cs, int cmd, int wval)
498 {
499 int err = 0;
500 u32 regval = 0;
501
502 switch (cmd) {
503 case GPMC_ENABLE_IRQ:
504 gpmc_write_reg(GPMC_IRQENABLE, wval);
505 break;
506
507 case GPMC_SET_IRQ_STATUS:
508 gpmc_write_reg(GPMC_IRQSTATUS, wval);
509 break;
510
511 case GPMC_CONFIG_WP:
512 regval = gpmc_read_reg(GPMC_CONFIG);
513 if (wval)
514 regval &= ~GPMC_CONFIG_WRITEPROTECT; /* WP is ON */
515 else
516 regval |= GPMC_CONFIG_WRITEPROTECT; /* WP is OFF */
517 gpmc_write_reg(GPMC_CONFIG, regval);
518 break;
519
520 case GPMC_CONFIG_RDY_BSY:
521 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
522 if (wval)
523 regval |= WR_RD_PIN_MONITORING;
524 else
525 regval &= ~WR_RD_PIN_MONITORING;
526 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
527 break;
528
529 case GPMC_CONFIG_DEV_SIZE:
530 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
531
532 /* clear 2 target bits */
533 regval &= ~GPMC_CONFIG1_DEVICESIZE(3);
534
535 /* set the proper value */
536 regval |= GPMC_CONFIG1_DEVICESIZE(wval);
537
538 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
539 break;
540
541 case GPMC_CONFIG_DEV_TYPE:
542 regval = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
543 regval |= GPMC_CONFIG1_DEVICETYPE(wval);
544 if (wval == GPMC_DEVICETYPE_NOR)
545 regval |= GPMC_CONFIG1_MUXADDDATA;
546 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, regval);
547 break;
548
549 default:
550 printk(KERN_ERR "gpmc_configure_cs: Not supported\n");
551 err = -EINVAL;
552 }
553
554 return err;
555 }
556 EXPORT_SYMBOL(gpmc_cs_configure);
557
558 /**
559 * gpmc_nand_read - nand specific read access request
560 * @cs: chip select number
561 * @cmd: command type
562 */
gpmc_nand_read(int cs,int cmd)563 int gpmc_nand_read(int cs, int cmd)
564 {
565 int rval = -EINVAL;
566
567 switch (cmd) {
568 case GPMC_NAND_DATA:
569 rval = gpmc_cs_read_byte(cs, GPMC_CS_NAND_DATA);
570 break;
571
572 default:
573 printk(KERN_ERR "gpmc_read_nand_ctrl: Not supported\n");
574 }
575 return rval;
576 }
577 EXPORT_SYMBOL(gpmc_nand_read);
578
579 /**
580 * gpmc_nand_write - nand specific write request
581 * @cs: chip select number
582 * @cmd: command type
583 * @wval: value to write
584 */
gpmc_nand_write(int cs,int cmd,int wval)585 int gpmc_nand_write(int cs, int cmd, int wval)
586 {
587 int err = 0;
588
589 switch (cmd) {
590 case GPMC_NAND_COMMAND:
591 gpmc_cs_write_byte(cs, GPMC_CS_NAND_COMMAND, wval);
592 break;
593
594 case GPMC_NAND_ADDRESS:
595 gpmc_cs_write_byte(cs, GPMC_CS_NAND_ADDRESS, wval);
596 break;
597
598 case GPMC_NAND_DATA:
599 gpmc_cs_write_byte(cs, GPMC_CS_NAND_DATA, wval);
600
601 default:
602 printk(KERN_ERR "gpmc_write_nand_ctrl: Not supported\n");
603 err = -EINVAL;
604 }
605 return err;
606 }
607 EXPORT_SYMBOL(gpmc_nand_write);
608
609
610
611 /**
612 * gpmc_prefetch_enable - configures and starts prefetch transfer
613 * @cs: cs (chip select) number
614 * @fifo_th: fifo threshold to be used for read/ write
615 * @dma_mode: dma mode enable (1) or disable (0)
616 * @u32_count: number of bytes to be transferred
617 * @is_write: prefetch read(0) or write post(1) mode
618 */
gpmc_prefetch_enable(int cs,int fifo_th,int dma_mode,unsigned int u32_count,int is_write)619 int gpmc_prefetch_enable(int cs, int fifo_th, int dma_mode,
620 unsigned int u32_count, int is_write)
621 {
622
623 if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX) {
624 pr_err("gpmc: fifo threshold is not supported\n");
625 return -1;
626 } else if (!(gpmc_read_reg(GPMC_PREFETCH_CONTROL))) {
627 /* Set the amount of bytes to be prefetched */
628 gpmc_write_reg(GPMC_PREFETCH_CONFIG2, u32_count);
629
630 /* Set dma/mpu mode, the prefetch read / post write and
631 * enable the engine. Set which cs is has requested for.
632 */
633 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, ((cs << CS_NUM_SHIFT) |
634 PREFETCH_FIFOTHRESHOLD(fifo_th) |
635 ENABLE_PREFETCH |
636 (dma_mode << DMA_MPU_MODE) |
637 (0x1 & is_write)));
638
639 /* Start the prefetch engine */
640 gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x1);
641 } else {
642 return -EBUSY;
643 }
644
645 return 0;
646 }
647 EXPORT_SYMBOL(gpmc_prefetch_enable);
648
649 /**
650 * gpmc_prefetch_reset - disables and stops the prefetch engine
651 */
gpmc_prefetch_reset(int cs)652 int gpmc_prefetch_reset(int cs)
653 {
654 u32 config1;
655
656 /* check if the same module/cs is trying to reset */
657 config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
658 if (((config1 >> CS_NUM_SHIFT) & 0x7) != cs)
659 return -EINVAL;
660
661 /* Stop the PFPW engine */
662 gpmc_write_reg(GPMC_PREFETCH_CONTROL, 0x0);
663
664 /* Reset/disable the PFPW engine */
665 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, 0x0);
666
667 return 0;
668 }
669 EXPORT_SYMBOL(gpmc_prefetch_reset);
670
gpmc_mem_init(void)671 static void __init gpmc_mem_init(void)
672 {
673 int cs;
674 unsigned long boot_rom_space = 0;
675
676 /* never allocate the first page, to facilitate bug detection;
677 * even if we didn't boot from ROM.
678 */
679 boot_rom_space = BOOT_ROM_SPACE;
680 /* In apollon the CS0 is mapped as 0x0000 0000 */
681 if (machine_is_omap_apollon())
682 boot_rom_space = 0;
683 gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
684 gpmc_mem_root.end = GPMC_MEM_END;
685
686 /* Reserve all regions that has been set up by bootloader */
687 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
688 u32 base, size;
689
690 if (!gpmc_cs_mem_enabled(cs))
691 continue;
692 gpmc_cs_get_memconf(cs, &base, &size);
693 if (gpmc_cs_insert_mem(cs, base, size) < 0)
694 BUG();
695 }
696 }
697
gpmc_init(void)698 static int __init gpmc_init(void)
699 {
700 u32 l, irq;
701 int cs, ret = -EINVAL;
702 int gpmc_irq;
703 char *ck = NULL;
704
705 if (cpu_is_omap24xx()) {
706 ck = "core_l3_ck";
707 if (cpu_is_omap2420())
708 l = OMAP2420_GPMC_BASE;
709 else
710 l = OMAP34XX_GPMC_BASE;
711 gpmc_irq = INT_34XX_GPMC_IRQ;
712 } else if (cpu_is_omap34xx()) {
713 ck = "gpmc_fck";
714 l = OMAP34XX_GPMC_BASE;
715 gpmc_irq = INT_34XX_GPMC_IRQ;
716 } else if (cpu_is_omap44xx()) {
717 ck = "gpmc_ck";
718 l = OMAP44XX_GPMC_BASE;
719 gpmc_irq = OMAP44XX_IRQ_GPMC;
720 }
721
722 if (WARN_ON(!ck))
723 return ret;
724
725 gpmc_l3_clk = clk_get(NULL, ck);
726 if (IS_ERR(gpmc_l3_clk)) {
727 printk(KERN_ERR "Could not get GPMC clock %s\n", ck);
728 BUG();
729 }
730
731 gpmc_base = ioremap(l, SZ_4K);
732 if (!gpmc_base) {
733 clk_put(gpmc_l3_clk);
734 printk(KERN_ERR "Could not get GPMC register memory\n");
735 BUG();
736 }
737
738 clk_enable(gpmc_l3_clk);
739
740 l = gpmc_read_reg(GPMC_REVISION);
741 printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
742 /* Set smart idle mode and automatic L3 clock gating */
743 l = gpmc_read_reg(GPMC_SYSCONFIG);
744 l &= 0x03 << 3;
745 l |= (0x02 << 3) | (1 << 0);
746 gpmc_write_reg(GPMC_SYSCONFIG, l);
747 gpmc_mem_init();
748
749 /* initalize the irq_chained */
750 irq = OMAP_GPMC_IRQ_BASE;
751 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
752 irq_set_chip_and_handler(irq, &dummy_irq_chip,
753 handle_simple_irq);
754 set_irq_flags(irq, IRQF_VALID);
755 irq++;
756 }
757
758 ret = request_irq(gpmc_irq,
759 gpmc_handle_irq, IRQF_SHARED, "gpmc", gpmc_base);
760 if (ret)
761 pr_err("gpmc: irq-%d could not claim: err %d\n",
762 gpmc_irq, ret);
763 return ret;
764 }
765 postcore_initcall(gpmc_init);
766
gpmc_handle_irq(int irq,void * dev)767 static irqreturn_t gpmc_handle_irq(int irq, void *dev)
768 {
769 u8 cs;
770
771 /* check cs to invoke the irq */
772 cs = ((gpmc_read_reg(GPMC_PREFETCH_CONFIG1)) >> CS_NUM_SHIFT) & 0x7;
773 if (OMAP_GPMC_IRQ_BASE+cs <= OMAP_GPMC_IRQ_END)
774 generic_handle_irq(OMAP_GPMC_IRQ_BASE+cs);
775
776 return IRQ_HANDLED;
777 }
778
779 #ifdef CONFIG_ARCH_OMAP3
780 static struct omap3_gpmc_regs gpmc_context;
781
omap3_gpmc_save_context(void)782 void omap3_gpmc_save_context(void)
783 {
784 int i;
785
786 gpmc_context.sysconfig = gpmc_read_reg(GPMC_SYSCONFIG);
787 gpmc_context.irqenable = gpmc_read_reg(GPMC_IRQENABLE);
788 gpmc_context.timeout_ctrl = gpmc_read_reg(GPMC_TIMEOUT_CONTROL);
789 gpmc_context.config = gpmc_read_reg(GPMC_CONFIG);
790 gpmc_context.prefetch_config1 = gpmc_read_reg(GPMC_PREFETCH_CONFIG1);
791 gpmc_context.prefetch_config2 = gpmc_read_reg(GPMC_PREFETCH_CONFIG2);
792 gpmc_context.prefetch_control = gpmc_read_reg(GPMC_PREFETCH_CONTROL);
793 for (i = 0; i < GPMC_CS_NUM; i++) {
794 gpmc_context.cs_context[i].is_valid = gpmc_cs_mem_enabled(i);
795 if (gpmc_context.cs_context[i].is_valid) {
796 gpmc_context.cs_context[i].config1 =
797 gpmc_cs_read_reg(i, GPMC_CS_CONFIG1);
798 gpmc_context.cs_context[i].config2 =
799 gpmc_cs_read_reg(i, GPMC_CS_CONFIG2);
800 gpmc_context.cs_context[i].config3 =
801 gpmc_cs_read_reg(i, GPMC_CS_CONFIG3);
802 gpmc_context.cs_context[i].config4 =
803 gpmc_cs_read_reg(i, GPMC_CS_CONFIG4);
804 gpmc_context.cs_context[i].config5 =
805 gpmc_cs_read_reg(i, GPMC_CS_CONFIG5);
806 gpmc_context.cs_context[i].config6 =
807 gpmc_cs_read_reg(i, GPMC_CS_CONFIG6);
808 gpmc_context.cs_context[i].config7 =
809 gpmc_cs_read_reg(i, GPMC_CS_CONFIG7);
810 }
811 }
812 }
813
omap3_gpmc_restore_context(void)814 void omap3_gpmc_restore_context(void)
815 {
816 int i;
817
818 gpmc_write_reg(GPMC_SYSCONFIG, gpmc_context.sysconfig);
819 gpmc_write_reg(GPMC_IRQENABLE, gpmc_context.irqenable);
820 gpmc_write_reg(GPMC_TIMEOUT_CONTROL, gpmc_context.timeout_ctrl);
821 gpmc_write_reg(GPMC_CONFIG, gpmc_context.config);
822 gpmc_write_reg(GPMC_PREFETCH_CONFIG1, gpmc_context.prefetch_config1);
823 gpmc_write_reg(GPMC_PREFETCH_CONFIG2, gpmc_context.prefetch_config2);
824 gpmc_write_reg(GPMC_PREFETCH_CONTROL, gpmc_context.prefetch_control);
825 for (i = 0; i < GPMC_CS_NUM; i++) {
826 if (gpmc_context.cs_context[i].is_valid) {
827 gpmc_cs_write_reg(i, GPMC_CS_CONFIG1,
828 gpmc_context.cs_context[i].config1);
829 gpmc_cs_write_reg(i, GPMC_CS_CONFIG2,
830 gpmc_context.cs_context[i].config2);
831 gpmc_cs_write_reg(i, GPMC_CS_CONFIG3,
832 gpmc_context.cs_context[i].config3);
833 gpmc_cs_write_reg(i, GPMC_CS_CONFIG4,
834 gpmc_context.cs_context[i].config4);
835 gpmc_cs_write_reg(i, GPMC_CS_CONFIG5,
836 gpmc_context.cs_context[i].config5);
837 gpmc_cs_write_reg(i, GPMC_CS_CONFIG6,
838 gpmc_context.cs_context[i].config6);
839 gpmc_cs_write_reg(i, GPMC_CS_CONFIG7,
840 gpmc_context.cs_context[i].config7);
841 }
842 }
843 }
844 #endif /* CONFIG_ARCH_OMAP3 */
845
846 /**
847 * gpmc_enable_hwecc - enable hardware ecc functionality
848 * @cs: chip select number
849 * @mode: read/write mode
850 * @dev_width: device bus width(1 for x16, 0 for x8)
851 * @ecc_size: bytes for which ECC will be generated
852 */
gpmc_enable_hwecc(int cs,int mode,int dev_width,int ecc_size)853 int gpmc_enable_hwecc(int cs, int mode, int dev_width, int ecc_size)
854 {
855 unsigned int val;
856
857 /* check if ecc module is in used */
858 if (gpmc_ecc_used != -EINVAL)
859 return -EINVAL;
860
861 gpmc_ecc_used = cs;
862
863 /* clear ecc and enable bits */
864 val = ((0x00000001<<8) | 0x00000001);
865 gpmc_write_reg(GPMC_ECC_CONTROL, val);
866
867 /* program ecc and result sizes */
868 val = ((((ecc_size >> 1) - 1) << 22) | (0x0000000F));
869 gpmc_write_reg(GPMC_ECC_SIZE_CONFIG, val);
870
871 switch (mode) {
872 case GPMC_ECC_READ:
873 gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
874 break;
875 case GPMC_ECC_READSYN:
876 gpmc_write_reg(GPMC_ECC_CONTROL, 0x100);
877 break;
878 case GPMC_ECC_WRITE:
879 gpmc_write_reg(GPMC_ECC_CONTROL, 0x101);
880 break;
881 default:
882 printk(KERN_INFO "Error: Unrecognized Mode[%d]!\n", mode);
883 break;
884 }
885
886 /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
887 val = (dev_width << 7) | (cs << 1) | (0x1);
888 gpmc_write_reg(GPMC_ECC_CONFIG, val);
889 return 0;
890 }
891 EXPORT_SYMBOL_GPL(gpmc_enable_hwecc);
892
893 /**
894 * gpmc_calculate_ecc - generate non-inverted ecc bytes
895 * @cs: chip select number
896 * @dat: data pointer over which ecc is computed
897 * @ecc_code: ecc code buffer
898 *
899 * Using non-inverted ECC is considered ugly since writing a blank
900 * page (padding) will clear the ECC bytes. This is not a problem as long
901 * no one is trying to write data on the seemingly unused page. Reading
902 * an erased page will produce an ECC mismatch between generated and read
903 * ECC bytes that has to be dealt with separately.
904 */
gpmc_calculate_ecc(int cs,const u_char * dat,u_char * ecc_code)905 int gpmc_calculate_ecc(int cs, const u_char *dat, u_char *ecc_code)
906 {
907 unsigned int val = 0x0;
908
909 if (gpmc_ecc_used != cs)
910 return -EINVAL;
911
912 /* read ecc result */
913 val = gpmc_read_reg(GPMC_ECC1_RESULT);
914 *ecc_code++ = val; /* P128e, ..., P1e */
915 *ecc_code++ = val >> 16; /* P128o, ..., P1o */
916 /* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
917 *ecc_code++ = ((val >> 8) & 0x0f) | ((val >> 20) & 0xf0);
918
919 gpmc_ecc_used = -EINVAL;
920 return 0;
921 }
922 EXPORT_SYMBOL_GPL(gpmc_calculate_ecc);
923