1 /*
2 * GPMC support functions
3 *
4 * Copyright (C) 2005-2006 Nokia Corporation
5 *
6 * Author: Juha Yrjola
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #undef DEBUG
13
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/err.h>
17 #include <linux/clk.h>
18 #include <linux/ioport.h>
19 #include <linux/spinlock.h>
20 #include <linux/io.h>
21 #include <linux/module.h>
22
23 #include <asm/mach-types.h>
24 #include <mach/gpmc.h>
25
26 #include <mach/sdrc.h>
27
28 /* GPMC register offsets */
29 #define GPMC_REVISION 0x00
30 #define GPMC_SYSCONFIG 0x10
31 #define GPMC_SYSSTATUS 0x14
32 #define GPMC_IRQSTATUS 0x18
33 #define GPMC_IRQENABLE 0x1c
34 #define GPMC_TIMEOUT_CONTROL 0x40
35 #define GPMC_ERR_ADDRESS 0x44
36 #define GPMC_ERR_TYPE 0x48
37 #define GPMC_CONFIG 0x50
38 #define GPMC_STATUS 0x54
39 #define GPMC_PREFETCH_CONFIG1 0x1e0
40 #define GPMC_PREFETCH_CONFIG2 0x1e4
41 #define GPMC_PREFETCH_CONTROL 0x1ec
42 #define GPMC_PREFETCH_STATUS 0x1f0
43 #define GPMC_ECC_CONFIG 0x1f4
44 #define GPMC_ECC_CONTROL 0x1f8
45 #define GPMC_ECC_SIZE_CONFIG 0x1fc
46
47 #define GPMC_CS0 0x60
48 #define GPMC_CS_SIZE 0x30
49
50 #define GPMC_MEM_START 0x00000000
51 #define GPMC_MEM_END 0x3FFFFFFF
52 #define BOOT_ROM_SPACE 0x100000 /* 1MB */
53
54 #define GPMC_CHUNK_SHIFT 24 /* 16 MB */
55 #define GPMC_SECTION_SHIFT 28 /* 128 MB */
56
57 static struct resource gpmc_mem_root;
58 static struct resource gpmc_cs_mem[GPMC_CS_NUM];
59 static DEFINE_SPINLOCK(gpmc_mem_lock);
60 static unsigned gpmc_cs_map;
61
62 static void __iomem *gpmc_base;
63
64 static struct clk *gpmc_l3_clk;
65
gpmc_write_reg(int idx,u32 val)66 static void gpmc_write_reg(int idx, u32 val)
67 {
68 __raw_writel(val, gpmc_base + idx);
69 }
70
gpmc_read_reg(int idx)71 static u32 gpmc_read_reg(int idx)
72 {
73 return __raw_readl(gpmc_base + idx);
74 }
75
gpmc_cs_write_reg(int cs,int idx,u32 val)76 void gpmc_cs_write_reg(int cs, int idx, u32 val)
77 {
78 void __iomem *reg_addr;
79
80 reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
81 __raw_writel(val, reg_addr);
82 }
83
gpmc_cs_read_reg(int cs,int idx)84 u32 gpmc_cs_read_reg(int cs, int idx)
85 {
86 void __iomem *reg_addr;
87
88 reg_addr = gpmc_base + GPMC_CS0 + (cs * GPMC_CS_SIZE) + idx;
89 return __raw_readl(reg_addr);
90 }
91
92 /* TODO: Add support for gpmc_fck to clock framework and use it */
gpmc_get_fclk_period(void)93 unsigned long gpmc_get_fclk_period(void)
94 {
95 unsigned long rate = clk_get_rate(gpmc_l3_clk);
96
97 if (rate == 0) {
98 printk(KERN_WARNING "gpmc_l3_clk not enabled\n");
99 return 0;
100 }
101
102 rate /= 1000;
103 rate = 1000000000 / rate; /* In picoseconds */
104
105 return rate;
106 }
107
gpmc_ns_to_ticks(unsigned int time_ns)108 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
109 {
110 unsigned long tick_ps;
111
112 /* Calculate in picosecs to yield more exact results */
113 tick_ps = gpmc_get_fclk_period();
114
115 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
116 }
117
gpmc_ticks_to_ns(unsigned int ticks)118 unsigned int gpmc_ticks_to_ns(unsigned int ticks)
119 {
120 return ticks * gpmc_get_fclk_period() / 1000;
121 }
122
gpmc_round_ns_to_ticks(unsigned int time_ns)123 unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
124 {
125 unsigned long ticks = gpmc_ns_to_ticks(time_ns);
126
127 return ticks * gpmc_get_fclk_period() / 1000;
128 }
129
130 #ifdef DEBUG
set_gpmc_timing_reg(int cs,int reg,int st_bit,int end_bit,int time,const char * name)131 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
132 int time, const char *name)
133 #else
134 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
135 int time)
136 #endif
137 {
138 u32 l;
139 int ticks, mask, nr_bits;
140
141 if (time == 0)
142 ticks = 0;
143 else
144 ticks = gpmc_ns_to_ticks(time);
145 nr_bits = end_bit - st_bit + 1;
146 if (ticks >= 1 << nr_bits) {
147 #ifdef DEBUG
148 printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
149 cs, name, time, ticks, 1 << nr_bits);
150 #endif
151 return -1;
152 }
153
154 mask = (1 << nr_bits) - 1;
155 l = gpmc_cs_read_reg(cs, reg);
156 #ifdef DEBUG
157 printk(KERN_INFO
158 "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
159 cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
160 (l >> st_bit) & mask, time);
161 #endif
162 l &= ~(mask << st_bit);
163 l |= ticks << st_bit;
164 gpmc_cs_write_reg(cs, reg, l);
165
166 return 0;
167 }
168
169 #ifdef DEBUG
170 #define GPMC_SET_ONE(reg, st, end, field) \
171 if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
172 t->field, #field) < 0) \
173 return -1
174 #else
175 #define GPMC_SET_ONE(reg, st, end, field) \
176 if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
177 return -1
178 #endif
179
gpmc_cs_calc_divider(int cs,unsigned int sync_clk)180 int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
181 {
182 int div;
183 u32 l;
184
185 l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1);
186 div = l / gpmc_get_fclk_period();
187 if (div > 4)
188 return -1;
189 if (div <= 0)
190 div = 1;
191
192 return div;
193 }
194
gpmc_cs_set_timings(int cs,const struct gpmc_timings * t)195 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
196 {
197 int div;
198 u32 l;
199
200 div = gpmc_cs_calc_divider(cs, t->sync_clk);
201 if (div < 0)
202 return -1;
203
204 GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
205 GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
206 GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
207
208 GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
209 GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
210 GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
211
212 GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
213 GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
214 GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
215 GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
216
217 GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
218 GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
219 GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
220
221 GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
222
223 if (cpu_is_omap34xx()) {
224 GPMC_SET_ONE(GPMC_CS_CONFIG6, 16, 19, wr_data_mux_bus);
225 GPMC_SET_ONE(GPMC_CS_CONFIG6, 24, 28, wr_access);
226 }
227
228 /* caller is expected to have initialized CONFIG1 to cover
229 * at least sync vs async
230 */
231 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
232 if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
233 #ifdef DEBUG
234 printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
235 cs, (div * gpmc_get_fclk_period()) / 1000, div);
236 #endif
237 l &= ~0x03;
238 l |= (div - 1);
239 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
240 }
241
242 return 0;
243 }
244
gpmc_cs_enable_mem(int cs,u32 base,u32 size)245 static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
246 {
247 u32 l;
248 u32 mask;
249
250 mask = (1 << GPMC_SECTION_SHIFT) - size;
251 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
252 l &= ~0x3f;
253 l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
254 l &= ~(0x0f << 8);
255 l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
256 l |= 1 << 6; /* CSVALID */
257 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
258 }
259
gpmc_cs_disable_mem(int cs)260 static void gpmc_cs_disable_mem(int cs)
261 {
262 u32 l;
263
264 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
265 l &= ~(1 << 6); /* CSVALID */
266 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
267 }
268
gpmc_cs_get_memconf(int cs,u32 * base,u32 * size)269 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
270 {
271 u32 l;
272 u32 mask;
273
274 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
275 *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
276 mask = (l >> 8) & 0x0f;
277 *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
278 }
279
gpmc_cs_mem_enabled(int cs)280 static int gpmc_cs_mem_enabled(int cs)
281 {
282 u32 l;
283
284 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
285 return l & (1 << 6);
286 }
287
gpmc_cs_set_reserved(int cs,int reserved)288 int gpmc_cs_set_reserved(int cs, int reserved)
289 {
290 if (cs > GPMC_CS_NUM)
291 return -ENODEV;
292
293 gpmc_cs_map &= ~(1 << cs);
294 gpmc_cs_map |= (reserved ? 1 : 0) << cs;
295
296 return 0;
297 }
298
gpmc_cs_reserved(int cs)299 int gpmc_cs_reserved(int cs)
300 {
301 if (cs > GPMC_CS_NUM)
302 return -ENODEV;
303
304 return gpmc_cs_map & (1 << cs);
305 }
306
gpmc_mem_align(unsigned long size)307 static unsigned long gpmc_mem_align(unsigned long size)
308 {
309 int order;
310
311 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
312 order = GPMC_CHUNK_SHIFT - 1;
313 do {
314 size >>= 1;
315 order++;
316 } while (size);
317 size = 1 << order;
318 return size;
319 }
320
gpmc_cs_insert_mem(int cs,unsigned long base,unsigned long size)321 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
322 {
323 struct resource *res = &gpmc_cs_mem[cs];
324 int r;
325
326 size = gpmc_mem_align(size);
327 spin_lock(&gpmc_mem_lock);
328 res->start = base;
329 res->end = base + size - 1;
330 r = request_resource(&gpmc_mem_root, res);
331 spin_unlock(&gpmc_mem_lock);
332
333 return r;
334 }
335
gpmc_cs_request(int cs,unsigned long size,unsigned long * base)336 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
337 {
338 struct resource *res = &gpmc_cs_mem[cs];
339 int r = -1;
340
341 if (cs > GPMC_CS_NUM)
342 return -ENODEV;
343
344 size = gpmc_mem_align(size);
345 if (size > (1 << GPMC_SECTION_SHIFT))
346 return -ENOMEM;
347
348 spin_lock(&gpmc_mem_lock);
349 if (gpmc_cs_reserved(cs)) {
350 r = -EBUSY;
351 goto out;
352 }
353 if (gpmc_cs_mem_enabled(cs))
354 r = adjust_resource(res, res->start & ~(size - 1), size);
355 if (r < 0)
356 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
357 size, NULL, NULL);
358 if (r < 0)
359 goto out;
360
361 gpmc_cs_enable_mem(cs, res->start, res->end - res->start + 1);
362 *base = res->start;
363 gpmc_cs_set_reserved(cs, 1);
364 out:
365 spin_unlock(&gpmc_mem_lock);
366 return r;
367 }
368 EXPORT_SYMBOL(gpmc_cs_request);
369
gpmc_cs_free(int cs)370 void gpmc_cs_free(int cs)
371 {
372 spin_lock(&gpmc_mem_lock);
373 if (cs >= GPMC_CS_NUM || !gpmc_cs_reserved(cs)) {
374 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
375 BUG();
376 spin_unlock(&gpmc_mem_lock);
377 return;
378 }
379 gpmc_cs_disable_mem(cs);
380 release_resource(&gpmc_cs_mem[cs]);
381 gpmc_cs_set_reserved(cs, 0);
382 spin_unlock(&gpmc_mem_lock);
383 }
384 EXPORT_SYMBOL(gpmc_cs_free);
385
gpmc_mem_init(void)386 static void __init gpmc_mem_init(void)
387 {
388 int cs;
389 unsigned long boot_rom_space = 0;
390
391 /* never allocate the first page, to facilitate bug detection;
392 * even if we didn't boot from ROM.
393 */
394 boot_rom_space = BOOT_ROM_SPACE;
395 /* In apollon the CS0 is mapped as 0x0000 0000 */
396 if (machine_is_omap_apollon())
397 boot_rom_space = 0;
398 gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
399 gpmc_mem_root.end = GPMC_MEM_END;
400
401 /* Reserve all regions that has been set up by bootloader */
402 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
403 u32 base, size;
404
405 if (!gpmc_cs_mem_enabled(cs))
406 continue;
407 gpmc_cs_get_memconf(cs, &base, &size);
408 if (gpmc_cs_insert_mem(cs, base, size) < 0)
409 BUG();
410 }
411 }
412
gpmc_init(void)413 void __init gpmc_init(void)
414 {
415 u32 l;
416 char *ck;
417
418 if (cpu_is_omap24xx()) {
419 ck = "core_l3_ck";
420 if (cpu_is_omap2420())
421 l = OMAP2420_GPMC_BASE;
422 else
423 l = OMAP34XX_GPMC_BASE;
424 } else if (cpu_is_omap34xx()) {
425 ck = "gpmc_fck";
426 l = OMAP34XX_GPMC_BASE;
427 }
428
429 gpmc_l3_clk = clk_get(NULL, ck);
430 if (IS_ERR(gpmc_l3_clk)) {
431 printk(KERN_ERR "Could not get GPMC clock %s\n", ck);
432 BUG();
433 }
434
435 gpmc_base = ioremap(l, SZ_4K);
436 if (!gpmc_base) {
437 clk_put(gpmc_l3_clk);
438 printk(KERN_ERR "Could not get GPMC register memory\n");
439 BUG();
440 }
441
442 l = gpmc_read_reg(GPMC_REVISION);
443 printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
444 /* Set smart idle mode and automatic L3 clock gating */
445 l = gpmc_read_reg(GPMC_SYSCONFIG);
446 l &= 0x03 << 3;
447 l |= (0x02 << 3) | (1 << 0);
448 gpmc_write_reg(GPMC_SYSCONFIG, l);
449
450 gpmc_mem_init();
451 }
452