2 * GPMC support functions
4 * Copyright (C) 2005-2006 Nokia Corporation
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/clk.h>
16 #include <linux/ioport.h>
17 #include <linux/spinlock.h>
20 #include <asm/mach-types.h>
21 #include <asm/arch/gpmc.h>
25 #ifdef CONFIG_ARCH_OMAP2420
26 #define GPMC_BASE 0x6800a000
29 #ifdef CONFIG_ARCH_OMAP2430
30 #define GPMC_BASE 0x6E000000
33 #define GPMC_REVISION 0x00
34 #define GPMC_SYSCONFIG 0x10
35 #define GPMC_SYSSTATUS 0x14
36 #define GPMC_IRQSTATUS 0x18
37 #define GPMC_IRQENABLE 0x1c
38 #define GPMC_TIMEOUT_CONTROL 0x40
39 #define GPMC_ERR_ADDRESS 0x44
40 #define GPMC_ERR_TYPE 0x48
41 #define GPMC_CONFIG 0x50
42 #define GPMC_STATUS 0x54
43 #define GPMC_PREFETCH_CONFIG1 0x1e0
44 #define GPMC_PREFETCH_CONFIG2 0x1e4
45 #define GPMC_PREFETCH_CONTROL 0x1e8
46 #define GPMC_PREFETCH_STATUS 0x1f0
47 #define GPMC_ECC_CONFIG 0x1f4
48 #define GPMC_ECC_CONTROL 0x1f8
49 #define GPMC_ECC_SIZE_CONFIG 0x1fc
52 #define GPMC_CS_SIZE 0x30
55 #define GPMC_MEM_START 0x00000000
56 #define GPMC_MEM_END 0x3FFFFFFF
57 #define BOOT_ROM_SPACE 0x100000 /* 1MB */
59 #define GPMC_CHUNK_SHIFT 24 /* 16 MB */
60 #define GPMC_SECTION_SHIFT 28 /* 128 MB */
62 static struct resource gpmc_mem_root;
63 static struct resource gpmc_cs_mem[GPMC_CS_NUM];
64 static DEFINE_SPINLOCK(gpmc_mem_lock);
65 static unsigned gpmc_cs_map;
67 static void __iomem *gpmc_base =
68 (void __iomem *) IO_ADDRESS(GPMC_BASE);
69 static void __iomem *gpmc_cs_base =
70 (void __iomem *) IO_ADDRESS(GPMC_BASE) + GPMC_CS0;
72 static struct clk *gpmc_fck;
74 static void gpmc_write_reg(int idx, u32 val)
76 __raw_writel(val, gpmc_base + idx);
79 static u32 gpmc_read_reg(int idx)
81 return __raw_readl(gpmc_base + idx);
84 void gpmc_cs_write_reg(int cs, int idx, u32 val)
86 void __iomem *reg_addr;
88 reg_addr = gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx;
89 __raw_writel(val, reg_addr);
92 u32 gpmc_cs_read_reg(int cs, int idx)
94 return __raw_readl(gpmc_cs_base + (cs * GPMC_CS_SIZE) + idx);
97 unsigned long gpmc_get_fclk_period(void)
100 return 1000000000 / ((clk_get_rate(gpmc_fck)) / 1000);
103 unsigned int gpmc_ns_to_ticks(unsigned int time_ns)
105 unsigned long tick_ps;
107 /* Calculate in picosecs to yield more exact results */
108 tick_ps = gpmc_get_fclk_period();
110 return (time_ns * 1000 + tick_ps - 1) / tick_ps;
113 unsigned int gpmc_round_ns_to_ticks(unsigned int time_ns)
115 unsigned long ticks = gpmc_ns_to_ticks(time_ns);
117 return ticks * gpmc_get_fclk_period() / 1000;
121 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
122 int time, const char *name)
124 static int set_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit,
129 int ticks, mask, nr_bits;
134 ticks = gpmc_ns_to_ticks(time);
135 nr_bits = end_bit - st_bit + 1;
136 if (ticks >= 1 << nr_bits) {
138 printk(KERN_INFO "GPMC CS%d: %-10s* %3d ns, %3d ticks >= %d\n",
139 cs, name, time, ticks, 1 << nr_bits);
144 mask = (1 << nr_bits) - 1;
145 l = gpmc_cs_read_reg(cs, reg);
148 "GPMC CS%d: %-10s: %3d ticks, %3lu ns (was %3i ticks) %3d ns\n",
149 cs, name, ticks, gpmc_get_fclk_period() * ticks / 1000,
150 (l >> st_bit) & mask, time);
152 l &= ~(mask << st_bit);
153 l |= ticks << st_bit;
154 gpmc_cs_write_reg(cs, reg, l);
160 #define GPMC_SET_ONE(reg, st, end, field) \
161 if (set_gpmc_timing_reg(cs, (reg), (st), (end), \
162 t->field, #field) < 0) \
165 #define GPMC_SET_ONE(reg, st, end, field) \
166 if (set_gpmc_timing_reg(cs, (reg), (st), (end), t->field) < 0) \
170 int gpmc_cs_calc_divider(int cs, unsigned int sync_clk)
175 l = sync_clk * 1000 + (gpmc_get_fclk_period() - 1);
176 div = l / gpmc_get_fclk_period();
185 int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
190 div = gpmc_cs_calc_divider(cs, t->sync_clk);
194 GPMC_SET_ONE(GPMC_CS_CONFIG2, 0, 3, cs_on);
195 GPMC_SET_ONE(GPMC_CS_CONFIG2, 8, 12, cs_rd_off);
196 GPMC_SET_ONE(GPMC_CS_CONFIG2, 16, 20, cs_wr_off);
198 GPMC_SET_ONE(GPMC_CS_CONFIG3, 0, 3, adv_on);
199 GPMC_SET_ONE(GPMC_CS_CONFIG3, 8, 12, adv_rd_off);
200 GPMC_SET_ONE(GPMC_CS_CONFIG3, 16, 20, adv_wr_off);
202 GPMC_SET_ONE(GPMC_CS_CONFIG4, 0, 3, oe_on);
203 GPMC_SET_ONE(GPMC_CS_CONFIG4, 8, 12, oe_off);
204 GPMC_SET_ONE(GPMC_CS_CONFIG4, 16, 19, we_on);
205 GPMC_SET_ONE(GPMC_CS_CONFIG4, 24, 28, we_off);
207 GPMC_SET_ONE(GPMC_CS_CONFIG5, 0, 4, rd_cycle);
208 GPMC_SET_ONE(GPMC_CS_CONFIG5, 8, 12, wr_cycle);
209 GPMC_SET_ONE(GPMC_CS_CONFIG5, 16, 20, access);
211 GPMC_SET_ONE(GPMC_CS_CONFIG5, 24, 27, page_burst_access);
213 /* caller is expected to have initialized CONFIG1 to cover
214 * at least sync vs async
216 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
217 if (l & (GPMC_CONFIG1_READTYPE_SYNC | GPMC_CONFIG1_WRITETYPE_SYNC)) {
219 printk(KERN_INFO "GPMC CS%d CLK period is %lu ns (div %d)\n",
220 cs, (div * gpmc_get_fclk_period()) / 1000, div);
224 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, l);
230 static void gpmc_cs_enable_mem(int cs, u32 base, u32 size)
235 mask = (1 << GPMC_SECTION_SHIFT) - size;
236 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
238 l = (base >> GPMC_CHUNK_SHIFT) & 0x3f;
240 l |= ((mask >> GPMC_CHUNK_SHIFT) & 0x0f) << 8;
241 l |= 1 << 6; /* CSVALID */
242 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
245 static void gpmc_cs_disable_mem(int cs)
249 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
250 l &= ~(1 << 6); /* CSVALID */
251 gpmc_cs_write_reg(cs, GPMC_CS_CONFIG7, l);
254 static void gpmc_cs_get_memconf(int cs, u32 *base, u32 *size)
259 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
260 *base = (l & 0x3f) << GPMC_CHUNK_SHIFT;
261 mask = (l >> 8) & 0x0f;
262 *size = (1 << GPMC_SECTION_SHIFT) - (mask << GPMC_CHUNK_SHIFT);
265 static int gpmc_cs_mem_enabled(int cs)
269 l = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG7);
273 int gpmc_cs_set_reserved(int cs, int reserved)
275 if (cs > GPMC_CS_NUM)
278 gpmc_cs_map &= ~(1 << cs);
279 gpmc_cs_map |= (reserved ? 1 : 0) << cs;
284 int gpmc_cs_reserved(int cs)
286 if (cs > GPMC_CS_NUM)
289 return gpmc_cs_map & (1 << cs);
292 static unsigned long gpmc_mem_align(unsigned long size)
296 size = (size - 1) >> (GPMC_CHUNK_SHIFT - 1);
297 order = GPMC_CHUNK_SHIFT - 1;
306 static int gpmc_cs_insert_mem(int cs, unsigned long base, unsigned long size)
308 struct resource *res = &gpmc_cs_mem[cs];
311 size = gpmc_mem_align(size);
312 spin_lock(&gpmc_mem_lock);
314 res->end = base + size - 1;
315 r = request_resource(&gpmc_mem_root, res);
316 spin_unlock(&gpmc_mem_lock);
321 int gpmc_cs_request(int cs, unsigned long size, unsigned long *base)
323 struct resource *res = &gpmc_cs_mem[cs];
326 if (cs > GPMC_CS_NUM)
329 size = gpmc_mem_align(size);
330 if (size > (1 << GPMC_SECTION_SHIFT))
333 spin_lock(&gpmc_mem_lock);
334 if (gpmc_cs_reserved(cs)) {
338 if (gpmc_cs_mem_enabled(cs))
339 r = adjust_resource(res, res->start & ~(size - 1), size);
341 r = allocate_resource(&gpmc_mem_root, res, size, 0, ~0,
346 gpmc_cs_enable_mem(cs, res->start, res->end - res->start + 1);
348 gpmc_cs_set_reserved(cs, 1);
350 spin_unlock(&gpmc_mem_lock);
354 void gpmc_cs_free(int cs)
356 spin_lock(&gpmc_mem_lock);
357 if (cs >= GPMC_CS_NUM || !gpmc_cs_reserved(cs)) {
358 printk(KERN_ERR "Trying to free non-reserved GPMC CS%d\n", cs);
360 spin_unlock(&gpmc_mem_lock);
363 gpmc_cs_disable_mem(cs);
364 release_resource(&gpmc_cs_mem[cs]);
365 gpmc_cs_set_reserved(cs, 0);
366 spin_unlock(&gpmc_mem_lock);
369 void __init gpmc_mem_init(void)
372 unsigned long boot_rom_space = 0;
374 /* never allocate the first page, to facilitate bug detection;
375 * even if we didn't boot from ROM.
377 boot_rom_space = BOOT_ROM_SPACE;
378 /* In apollon the CS0 is mapped as 0x0000 0000 */
379 if (machine_is_omap_apollon())
381 gpmc_mem_root.start = GPMC_MEM_START + boot_rom_space;
382 gpmc_mem_root.end = GPMC_MEM_END;
384 /* Reserve all regions that has been set up by bootloader */
385 for (cs = 0; cs < GPMC_CS_NUM; cs++) {
388 if (!gpmc_cs_mem_enabled(cs))
390 gpmc_cs_get_memconf(cs, &base, &size);
391 if (gpmc_cs_insert_mem(cs, base, size) < 0)
396 void __init gpmc_init(void)
400 gpmc_fck = clk_get(NULL, "gpmc_fck"); /* Always on ENABLE_ON_INIT */
401 if (IS_ERR(gpmc_fck))
404 clk_enable(gpmc_fck);
406 l = gpmc_read_reg(GPMC_REVISION);
407 printk(KERN_INFO "GPMC revision %d.%d\n", (l >> 4) & 0x0f, l & 0x0f);
408 /* Set smart idle mode and automatic L3 clock gating */
409 l = gpmc_read_reg(GPMC_SYSCONFIG);
411 l |= (0x02 << 3) | (1 << 0);
412 gpmc_write_reg(GPMC_SYSCONFIG, l);