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4bbbc1ad JY |
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 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/clk.h> | |
f37e4580 ID |
16 | #include <linux/ioport.h> |
17 | #include <linux/spinlock.h> | |
4bbbc1ad JY |
18 | |
19 | #include <asm/io.h> | |
7f245162 | 20 | #include <asm/mach-types.h> |
4bbbc1ad JY |
21 | #include <asm/arch/gpmc.h> |
22 | ||
23 | #undef DEBUG | |
24 | ||
25 | #define GPMC_BASE 0x6800a000 | |
26 | #define GPMC_REVISION 0x00 | |
27 | #define GPMC_SYSCONFIG 0x10 | |
28 | #define GPMC_SYSSTATUS 0x14 | |
29 | #define GPMC_IRQSTATUS 0x18 | |
30 | #define GPMC_IRQENABLE 0x1c | |
31 | #define GPMC_TIMEOUT_CONTROL 0x40 | |
32 | #define GPMC_ERR_ADDRESS 0x44 | |
33 | #define GPMC_ERR_TYPE 0x48 | |
34 | #define GPMC_CONFIG 0x50 | |
35 | #define GPMC_STATUS 0x54 | |
36 | #define GPMC_PREFETCH_CONFIG1 0x1e0 | |
37 | #define GPMC_PREFETCH_CONFIG2 0x1e4 | |
38 | #define GPMC_PREFETCH_CONTROL 0x1e8 | |
39 | #define GPMC_PREFETCH_STATUS 0x1f0 | |
40 | #define GPMC_ECC_CONFIG 0x1f4 | |
41 | #define GPMC_ECC_CONTROL 0x1f8 | |
42 | #define GPMC_ECC_SIZE_CONFIG 0x1fc | |
43 | ||
44 | #define GPMC_CS0 0x60 | |
45 | #define GPMC_CS_SIZE 0x30 | |
46 | ||
f37e4580 ID |
47 | #define GPMC_CS_NUM 8 |
48 | #define GPMC_MEM_START 0x00000000 | |
49 | #define GPMC_MEM_END 0x3FFFFFFF | |
50 | #define BOOT_ROM_SPACE 0x100000 /* 1MB */ | |
51 | ||
52 | #define GPMC_CHUNK_SHIFT 24 /* 16 MB */ | |
53 | #define GPMC_SECTION_SHIFT 28 /* 128 MB */ | |
54 | ||
55 | static struct resource gpmc_mem_root; | |
56 | static struct resource gpmc_cs_mem[GPMC_CS_NUM]; | |
57 | static spinlock_t gpmc_mem_lock = SPIN_LOCK_UNLOCKED; | |
58 | static unsigned gpmc_cs_map; | |
59 | ||
4bbbc1ad JY |
60 | static void __iomem *gpmc_base = |
61 | (void __iomem *) IO_ADDRESS(GPMC_BASE); | |
62 | static void __iomem *gpmc_cs_base = | |
63 | (void __iomem *) IO_ADDRESS(GPMC_BASE) + GPMC_CS0; | |
64 | ||
65 | static struct clk *gpmc_l3_clk; | |
66 | ||
67 | static void gpmc_write_reg(int idx, u32 val) | |
68 | { | |
69 | __raw_writel(val, gpmc_base + idx); | |
70 | } | |
71 | ||
72 | static u32 gpmc_read_reg(int idx) | |
73 | { | |
74 | return __raw_readl(gpmc_base + idx); | |
75 | } | |
76 | ||
77 | void gpmc_cs_write_reg(int cs, int idx, u32 val) | |
78 | { | |
79 | void __iomem *reg_addr; | |
80 | ||
81 | reg_addr = gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx; | |
82 | __raw_writel(val, reg_addr); | |
83 | } | |
84 | ||
85 | u32 gpmc_cs_read_reg(int cs, int idx) | |
86 | { | |
87 | return __raw_readl(gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx); | |
88 | } | |
89 | ||
90 | /* TODO: Add support for gpmc_fck to clock framework and use it */ | |
91 | static unsigned long gpmc_get_fclk_period(void) | |
92 | { | |
93 | /* In picoseconds */ | |
94 | return 1000000000 / ((clk_get_rate(gpmc_l3_clk)) / 1000); | |
95 | } | |
96 | ||
97 | unsigned int gpmc_ns_to_ticks(unsigned int time_ns) | |
98 | { | |
99 | unsigned long tick_ps; | |
100 | ||
101 | /* Calculate in picosecs to yield more exact results */ | |
102 | tick_ps = gpmc_get_fclk_period(); | |
103 | ||
104 | return (time_ns * 1000 + tick_ps - 1) / tick_ps; | |
105 | } | |
106 | ||
107 | #ifdef DEBUG | |
108 | static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, | |
2aab6468 | 109 | int time, const char *name) |
4bbbc1ad JY |
110 | #else |
111 | static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, | |
112 | int time) | |
113 | #endif | |
114 | { | |
115 | u32 l; | |
116 | int ticks, mask, nr_bits; | |
117 | ||
118 | if (time == 0) | |
119 | ticks = 0; | |
120 | else | |
121 | ticks = gpmc_ns_to_ticks(time); | |
122 | nr_bits = end_bit - st_bit + 1; | |
123 | if (ticks >= 1 << nr_bits) | |
124 | return -1; | |
125 | ||
126 | mask = (1 << nr_bits) - 1; | |
127 | l = gpmc_cs_read_reg(cs, reg); | |
128 | #ifdef DEBUG | |
129 | printk(KERN_INFO "GPMC CS%d: %-10s: %d ticks, %3lu ns (was %i ticks)\n", | |
2aab6468 | 130 | cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000, |
4bbbc1ad JY |
131 | (l >> st_bit) & mask); |
132 | #endif | |
133 | l &= ~(mask << st_bit); | |
134 | l |= ticks << st_bit; | |
135 | gpmc_cs_write_reg(cs, reg, l); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | #ifdef DEBUG | |
141 | #define GPMC_SET_ONE(reg, st, end, field) \ | |
142 | if (set_gpmc_timing_reg(cs, (reg), (st), (end), \ | |
143 | t->field, #field) < 0) \ | |
144 | return -1 | |
145 | #else | |
146 | #define GPMC_SET_ONE(reg, st, end, field) \ | |
147 | if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \ | |
148 | return -1 | |
149 | #endif | |
150 | ||
151 | int gpmc_cs_calc_divider(int cs, unsigned int sync_clk) | |
152 | { | |
153 | int div; | |
154 | u32 l; | |
155 | ||
156 | l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1); | |
157 | div = l / gpmc_get_fclk_period(); | |
158 | if (div > 4) | |
159 | return -1; | |
160 | if (div < 0) | |
161 | div = 1; | |
162 | ||
163 | return div; | |
164 | } | |
165 | ||
166 | int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t) | |
167 | { | |
168 | int div; | |
169 | u32 l; | |
170 | ||
171 | div = gpmc_cs_calc_divider(cs, t->sync_clk); | |
172 | if (div < 0) | |
173 | return -1; | |
174 | ||
175 | GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on); | |
176 | GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off); | |
177 | GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off); | |
178 | ||
179 | GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on); | |
180 | GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off); | |
181 | GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off); | |
182 | ||
183 | GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on); | |
184 | GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off); | |
185 | GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on); | |
186 | GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off); | |
187 | ||
188 | GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle); | |
189 | GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle); | |
190 | GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access); | |
191 | ||
192 | GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access); | |
193 | ||
194 | #ifdef DEBUG | |
2aab6468 JY |
195 | printk(KERN_INFO "GPMC CS%d CLK period is %lu (div %d)\n", |
196 | cs, gpmc_get_fclk_period(), div); | |
4bbbc1ad JY |
197 | #endif |
198 | ||
199 | l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1); | |
200 | l &= ~0x03; | |
201 | l |= (div - 1); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
f37e4580 ID |
206 | static void gpmc_cs_enable_mem(int cs, u32 base, u32 size) |
207 | { | |
208 | u32 l; | |
209 | u32 mask; | |
210 | ||
211 | mask = (1 << GPMC_SECTION_SHIFT) - size; | |
212 | l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); | |
213 | l &= ~0x3f; | |
214 | l = (base >> GPMC_CHUNK_SHIFT) & 0x3f; | |
215 | l &= ~(0x0f << 8); | |
216 | l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8; | |
217 | l |= 1 << 6; /* CSVALID */ | |
218 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); | |
219 | } | |
220 | ||
221 | static void gpmc_cs_disable_mem(int cs) | |
222 | { | |
223 | u32 l; | |
224 | ||
225 | l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); | |
226 | l &= ~(1 << 6); /* CSVALID */ | |
227 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l); | |
228 | } | |
229 | ||
230 | static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size) | |
231 | { | |
232 | u32 l; | |
233 | u32 mask; | |
234 | ||
235 | l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); | |
236 | *base = (l & 0x3f) << GPMC_CHUNK_SHIFT; | |
237 | mask = (l >> 8) & 0x0f; | |
238 | *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT); | |
239 | } | |
240 | ||
241 | static int gpmc_cs_mem_enabled(int cs) | |
242 | { | |
243 | u32 l; | |
244 | ||
245 | l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7); | |
246 | return l & (1 << 6); | |
247 | } | |
248 | ||
c40fae95 | 249 | int gpmc_cs_set_reserved(int cs, int reserved) |
4bbbc1ad | 250 | { |
c40fae95 TL |
251 | if (cs > GPMC_CS_NUM) |
252 | return -ENODEV; | |
253 | ||
f37e4580 ID |
254 | gpmc_cs_map &= ~(1 << cs); |
255 | gpmc_cs_map |= (reserved ? 1 : 0) << cs; | |
c40fae95 TL |
256 | |
257 | return 0; | |
f37e4580 ID |
258 | } |
259 | ||
c40fae95 | 260 | int gpmc_cs_reserved(int cs) |
f37e4580 | 261 | { |
c40fae95 TL |
262 | if (cs > GPMC_CS_NUM) |
263 | return -ENODEV; | |
264 | ||
f37e4580 ID |
265 | return gpmc_cs_map & (1 << cs); |
266 | } | |
267 | ||
268 | static unsigned long gpmc_mem_align(unsigned long size) | |
269 | { | |
270 | int order; | |
271 | ||
272 | size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1); | |
273 | order = GPMC_CHUNK_SHIFT - 1; | |
274 | do { | |
275 | size >>= 1; | |
276 | order++; | |
277 | } while (size); | |
278 | size = 1 << order; | |
279 | return size; | |
280 | } | |
281 | ||
282 | static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size) | |
283 | { | |
284 | struct resource *res = &gpmc_cs_mem[cs]; | |
285 | int r; | |
286 | ||
287 | size = gpmc_mem_align(size); | |
288 | spin_lock(&gpmc_mem_lock); | |
289 | res->start = base; | |
290 | res->end = base + size - 1; | |
291 | r = request_resource(&gpmc_mem_root, res); | |
292 | spin_unlock(&gpmc_mem_lock); | |
293 | ||
294 | return r; | |
295 | } | |
296 | ||
297 | int gpmc_cs_request(int cs, unsigned long size, unsigned long *base) | |
298 | { | |
299 | struct resource *res = &gpmc_cs_mem[cs]; | |
300 | int r = -1; | |
301 | ||
302 | if (cs > GPMC_CS_NUM) | |
303 | return -ENODEV; | |
304 | ||
305 | size = gpmc_mem_align(size); | |
306 | if (size > (1 << GPMC_SECTION_SHIFT)) | |
307 | return -ENOMEM; | |
308 | ||
309 | spin_lock(&gpmc_mem_lock); | |
310 | if (gpmc_cs_reserved(cs)) { | |
311 | r = -EBUSY; | |
312 | goto out; | |
313 | } | |
314 | if (gpmc_cs_mem_enabled(cs)) | |
315 | r = adjust_resource(res, res->start & ~(size - 1), size); | |
316 | if (r < 0) | |
317 | r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0, | |
318 | size, NULL, NULL); | |
319 | if (r < 0) | |
320 | goto out; | |
321 | ||
322 | gpmc_cs_enable_mem(cs, res->start, res->end - res->start + 1); | |
323 | *base = res->start; | |
324 | gpmc_cs_set_reserved(cs, 1); | |
325 | out: | |
326 | spin_unlock(&gpmc_mem_lock); | |
327 | return r; | |
328 | } | |
329 | ||
330 | void gpmc_cs_free(int cs) | |
331 | { | |
332 | spin_lock(&gpmc_mem_lock); | |
333 | if (cs >= GPMC_CS_NUM || !gpmc_cs_reserved(cs)) { | |
334 | printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs); | |
335 | BUG(); | |
336 | spin_unlock(&gpmc_mem_lock); | |
337 | return; | |
338 | } | |
339 | gpmc_cs_disable_mem(cs); | |
340 | release_resource(&gpmc_cs_mem[cs]); | |
341 | gpmc_cs_set_reserved(cs, 0); | |
342 | spin_unlock(&gpmc_mem_lock); | |
343 | } | |
344 | ||
345 | void __init gpmc_mem_init(void) | |
346 | { | |
347 | int cs; | |
348 | unsigned long boot_rom_space = 0; | |
349 | ||
7f245162 KP |
350 | /* never allocate the first page, to facilitate bug detection; |
351 | * even if we didn't boot from ROM. | |
352 | */ | |
353 | boot_rom_space = BOOT_ROM_SPACE; | |
354 | /* In apollon the CS0 is mapped as 0x0000 0000 */ | |
355 | if (machine_is_omap_apollon()) | |
356 | boot_rom_space = 0; | |
f37e4580 ID |
357 | gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space; |
358 | gpmc_mem_root.end = GPMC_MEM_END; | |
359 | ||
360 | /* Reserve all regions that has been set up by bootloader */ | |
361 | for (cs = 0; cs < GPMC_CS_NUM; cs++) { | |
362 | u32 base, size; | |
363 | ||
364 | if (!gpmc_cs_mem_enabled(cs)) | |
365 | continue; | |
366 | gpmc_cs_get_memconf(cs, &base, &size); | |
367 | if (gpmc_cs_insert_mem(cs, base, size) < 0) | |
368 | BUG(); | |
369 | } | |
4bbbc1ad JY |
370 | } |
371 | ||
372 | void __init gpmc_init(void) | |
373 | { | |
374 | u32 l; | |
375 | ||
376 | gpmc_l3_clk = clk_get(NULL, "core_l3_ck"); | |
377 | BUG_ON(IS_ERR(gpmc_l3_clk)); | |
378 | ||
379 | l = gpmc_read_reg(GPMC_REVISION); | |
380 | printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f); | |
381 | /* Set smart idle mode and automatic L3 clock gating */ | |
382 | l = gpmc_read_reg(GPMC_SYSCONFIG); | |
383 | l &= 0x03 << 3; | |
384 | l |= (0x02 << 3) | (1 << 0); | |
385 | gpmc_write_reg(GPMC_SYSCONFIG, l); | |
f37e4580 ID |
386 | |
387 | gpmc_mem_init(); | |
4bbbc1ad | 388 | } |