2 * linux/arch/arm/plat-omap/sram.c
4 * OMAP SRAM detection and management
6 * Copyright (C) 2005 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
20 #include <asm/cacheflush.h>
22 #include <asm/mach/map.h>
24 #include <asm/arch/sram.h>
25 #include <asm/arch/board.h>
27 #define OMAP1_SRAM_PA 0x20000000
28 #define OMAP1_SRAM_VA 0xd0000000
29 #define OMAP2_SRAM_PA 0x40200000
30 #define OMAP2_SRAM_PUB_PA 0x4020f800
31 #define OMAP2_SRAM_VA 0xd0000000
32 #define OMAP2_SRAM_PUB_VA 0xd0000800
34 #if defined(CONFIG_ARCH_OMAP24XX)
35 #define SRAM_BOOTLOADER_SZ 0x00
37 #define SRAM_BOOTLOADER_SZ 0x80
40 #define VA_REQINFOPERM0 IO_ADDRESS(0x68005048)
41 #define VA_READPERM0 IO_ADDRESS(0x68005050)
42 #define VA_WRITEPERM0 IO_ADDRESS(0x68005058)
43 #define VA_CONTROL_STAT IO_ADDRESS(0x480002F8)
44 #define GP_DEVICE 0x300
45 #define TYPE_MASK 0x700
47 #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
49 static unsigned long omap_sram_start;
50 static unsigned long omap_sram_base;
51 static unsigned long omap_sram_size;
52 static unsigned long omap_sram_ceil;
54 int omap_fb_sram_plane = -1;
55 int omap_fb_sram_valid;
57 /* Depending on the target RAMFS firewall setup, the public usable amount of
58 * SRAM varies. The default accessable size for all device types is 2k. A GP
59 * device allows ARM11 but not other initators for full size. This
60 * functionality seems ok until some nice security API happens.
62 static int is_sram_locked(void)
66 if (cpu_is_omap242x())
67 type = __raw_readl(VA_CONTROL_STAT) & TYPE_MASK;
69 if (type == GP_DEVICE) {
70 /* RAMFW: R/W access to all initators for all qualifier sets */
71 if (cpu_is_omap242x()) {
72 __raw_writel(0xFF, VA_REQINFOPERM0); /* all q-vects */
73 __raw_writel(0xCFDE, VA_READPERM0); /* all i-read */
74 __raw_writel(0xCFDE, VA_WRITEPERM0); /* all i-write */
78 return 1; /* assume locked with no PPA or security driver */
81 static int get_fb_sram_conf(unsigned long start_avail, unsigned size_avail,
82 unsigned long *start, int *plane_idx)
84 const struct omap_fbmem_config *fbmem_conf;
85 unsigned long size = 0;
91 while ((fbmem_conf = omap_get_nr_config(OMAP_TAG_FBMEM,
92 struct omap_fbmem_config, i)) != NULL) {
95 paddr = fbmem_conf->start;
96 end = fbmem_conf->start + fbmem_conf->size;
97 if (paddr > omap_sram_start &&
98 paddr < omap_sram_start + omap_sram_size) {
99 if (*plane_idx != -1 || paddr < start_avail ||
101 end > start_avail + size_avail) {
102 printk(KERN_ERR "invalid FB SRAM configuration");
107 *start = fbmem_conf->start;
108 size = fbmem_conf->size;
114 pr_info("Reserving %lu bytes SRAM frame buffer "
115 "for plane %d\n", size, *plane_idx);
121 * The amount of SRAM depends on the core type.
122 * Note that we cannot try to test for SRAM here because writes
123 * to secure SRAM will hang the system. Also the SRAM is not
124 * yet mapped at this point.
126 void __init omap_detect_sram(void)
128 unsigned long fb_sram_start;
130 if (cpu_is_omap24xx()) {
131 if (is_sram_locked()) {
132 omap_sram_base = OMAP2_SRAM_PUB_VA;
133 omap_sram_start = OMAP2_SRAM_PUB_PA;
134 omap_sram_size = 0x800; /* 2K */
136 omap_sram_base = OMAP2_SRAM_VA;
137 omap_sram_start = OMAP2_SRAM_PA;
138 if (cpu_is_omap242x())
139 omap_sram_size = 0xa0000; /* 640K */
140 else if (cpu_is_omap243x())
141 omap_sram_size = 0x10000; /* 64K */
144 omap_sram_base = OMAP1_SRAM_VA;
145 omap_sram_start = OMAP1_SRAM_PA;
147 if (cpu_is_omap730())
148 omap_sram_size = 0x32000; /* 200K */
149 else if (cpu_is_omap15xx())
150 omap_sram_size = 0x30000; /* 192K */
151 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
153 omap_sram_size = 0x4000; /* 16K */
154 else if (cpu_is_omap1611())
155 omap_sram_size = 0x3e800; /* 250K */
157 printk(KERN_ERR "Could not detect SRAM size\n");
158 omap_sram_size = 0x4000;
161 if (get_fb_sram_conf(omap_sram_start + SRAM_BOOTLOADER_SZ,
162 omap_sram_size - SRAM_BOOTLOADER_SZ,
163 &fb_sram_start, &omap_fb_sram_plane) == 0)
164 omap_fb_sram_valid = 1;
165 if (omap_fb_sram_valid && omap_fb_sram_plane >= 0)
166 omap_sram_size -= omap_sram_start + omap_sram_size -
168 omap_sram_ceil = omap_sram_base + omap_sram_size;
171 static struct map_desc omap_sram_io_desc[] __initdata = {
172 { /* .length gets filled in at runtime */
173 .virtual = OMAP1_SRAM_VA,
174 .pfn = __phys_to_pfn(OMAP1_SRAM_PA),
180 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
182 void __init omap_map_sram(void)
186 if (omap_sram_size == 0)
189 if (cpu_is_omap24xx()) {
190 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
192 base = OMAP2_SRAM_PA;
193 base = ROUND_DOWN(base, PAGE_SIZE);
194 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
197 omap_sram_io_desc[0].length = 1024 * 1024; /* Use section desc */
198 iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
200 printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
201 __pfn_to_phys(omap_sram_io_desc[0].pfn),
202 omap_sram_io_desc[0].virtual,
203 omap_sram_io_desc[0].length);
206 * Normally devicemaps_init() would flush caches and tlb after
207 * mdesc->map_io(), but since we're called from map_io(), we
210 local_flush_tlb_all();
214 * Looks like we need to preserve some bootloader code at the
215 * beginning of SRAM for jumping to flash for reboot to work...
217 memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
218 omap_sram_size - SRAM_BOOTLOADER_SZ);
221 void * omap_sram_push(void * start, unsigned long size)
223 if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
224 printk(KERN_ERR "Not enough space in SRAM\n");
228 omap_sram_ceil -= size;
229 omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
230 memcpy((void *)omap_sram_ceil, start, size);
232 return (void *)omap_sram_ceil;
235 static void omap_sram_error(void)
237 panic("Uninitialized SRAM function\n");
240 #ifdef CONFIG_ARCH_OMAP1
242 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
244 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
246 if (!_omap_sram_reprogram_clock)
249 return _omap_sram_reprogram_clock(dpllctl, ckctl);
252 int __init omap1_sram_init(void)
254 _omap_sram_reprogram_clock = omap_sram_push(sram_reprogram_clock,
255 sram_reprogram_clock_sz);
261 #define omap1_sram_init() do {} while (0)
264 #ifdef CONFIG_ARCH_OMAP2
266 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
267 u32 base_cs, u32 force_unlock);
269 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
270 u32 base_cs, u32 force_unlock)
272 if (!_omap2_sram_ddr_init)
275 return _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
276 base_cs, force_unlock);
279 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
282 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
284 if (!_omap2_sram_reprogram_sdrc)
287 return _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
290 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
292 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
294 if (!_omap2_set_prcm)
297 return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
300 int __init omap2_sram_init(void)
302 _omap2_sram_ddr_init = omap_sram_push(sram_ddr_init, sram_ddr_init_sz);
304 _omap2_sram_reprogram_sdrc = omap_sram_push(sram_reprogram_sdrc,
305 sram_reprogram_sdrc_sz);
306 _omap2_set_prcm = omap_sram_push(sram_set_prcm, sram_set_prcm_sz);
311 #define omap2_sram_init() do {} while (0)
314 int __init omap_sram_init(void)
319 if (!cpu_is_omap24xx())