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 * Copyright (C) 2009 Texas Instruments
10 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
24 #include <asm/cacheflush.h>
26 #include <asm/mach/map.h>
28 #include <plat/sram.h>
29 #include <plat/board.h>
34 /* XXX These "sideways" includes will disappear when sram.c becomes a driver */
35 #include "../mach-omap2/iomap.h"
36 #include "../mach-omap2/prm2xxx_3xxx.h"
37 #include "../mach-omap2/sdrc.h"
39 #define OMAP1_SRAM_PA 0x20000000
40 #define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800)
41 #define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000)
42 #ifdef CONFIG_OMAP4_ERRATA_I688
43 #define OMAP4_SRAM_PUB_PA OMAP4_SRAM_PA
45 #define OMAP4_SRAM_PUB_PA (OMAP4_SRAM_PA + 0x4000)
48 #if defined(CONFIG_ARCH_OMAP2PLUS)
49 #define SRAM_BOOTLOADER_SZ 0x00
51 #define SRAM_BOOTLOADER_SZ 0x80
54 #define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048)
55 #define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050)
56 #define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058)
58 #define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848)
59 #define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850)
60 #define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858)
61 #define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880)
62 #define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048)
64 #define GP_DEVICE 0x300
66 #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
68 static unsigned long omap_sram_start;
69 static void __iomem *omap_sram_base;
70 static unsigned long omap_sram_size;
71 static void __iomem *omap_sram_ceil;
74 * Depending on the target RAMFS firewall setup, the public usable amount of
75 * SRAM varies. The default accessible size for all device types is 2k. A GP
76 * device allows ARM11 but not other initiators for full size. This
77 * functionality seems ok until some nice security API happens.
79 static int is_sram_locked(void)
81 if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
82 /* RAMFW: R/W access to all initiators for all qualifier sets */
83 if (cpu_is_omap242x()) {
84 __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
85 __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
86 __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
88 if (cpu_is_omap34xx() && !cpu_is_am33xx()) {
89 __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
90 __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
91 __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
92 __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
93 __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
97 return 1; /* assume locked with no PPA or security driver */
101 * The amount of SRAM depends on the core type.
102 * Note that we cannot try to test for SRAM here because writes
103 * to secure SRAM will hang the system. Also the SRAM is not
104 * yet mapped at this point.
106 static void __init omap_detect_sram(void)
108 if (cpu_class_is_omap2()) {
109 if (is_sram_locked()) {
110 if (cpu_is_omap34xx()) {
111 omap_sram_start = OMAP3_SRAM_PUB_PA;
112 if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
113 (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
114 omap_sram_size = 0x7000; /* 28K */
116 omap_sram_size = 0x8000; /* 32K */
118 } else if (cpu_is_omap44xx()) {
119 omap_sram_start = OMAP4_SRAM_PUB_PA;
120 omap_sram_size = 0xa000; /* 40K */
122 omap_sram_start = OMAP2_SRAM_PUB_PA;
123 omap_sram_size = 0x800; /* 2K */
126 if (cpu_is_am33xx()) {
127 omap_sram_start = AM33XX_SRAM_PA;
128 omap_sram_size = 0x10000; /* 64K */
129 } else if (cpu_is_omap34xx()) {
130 omap_sram_start = OMAP3_SRAM_PA;
131 omap_sram_size = 0x10000; /* 64K */
132 } else if (cpu_is_omap44xx()) {
133 omap_sram_start = OMAP4_SRAM_PA;
134 omap_sram_size = 0xe000; /* 56K */
136 omap_sram_start = OMAP2_SRAM_PA;
137 if (cpu_is_omap242x())
138 omap_sram_size = 0xa0000; /* 640K */
139 else if (cpu_is_omap243x())
140 omap_sram_size = 0x10000; /* 64K */
144 omap_sram_start = OMAP1_SRAM_PA;
146 if (cpu_is_omap7xx())
147 omap_sram_size = 0x32000; /* 200K */
148 else if (cpu_is_omap15xx())
149 omap_sram_size = 0x30000; /* 192K */
150 else if (cpu_is_omap1610() || cpu_is_omap1611() ||
151 cpu_is_omap1621() || cpu_is_omap1710())
152 omap_sram_size = 0x4000; /* 16K */
154 pr_err("Could not detect SRAM size\n");
155 omap_sram_size = 0x4000;
161 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
163 static void __init omap_map_sram(void)
167 if (omap_sram_size == 0)
170 #ifdef CONFIG_OMAP4_ERRATA_I688
171 omap_sram_start += PAGE_SIZE;
172 omap_sram_size -= SZ_16K;
174 if (cpu_is_omap34xx()) {
176 * SRAM must be marked as non-cached on OMAP3 since the
177 * CORE DPLL M2 divider change code (in SRAM) runs with the
178 * SDRAM controller disabled, and if it is marked cached,
179 * the ARM may attempt to write cache lines back to SDRAM
180 * which will cause the system to hang.
185 omap_sram_start = ROUND_DOWN(omap_sram_start, PAGE_SIZE);
186 omap_sram_base = __arm_ioremap_exec(omap_sram_start, omap_sram_size,
188 if (!omap_sram_base) {
189 pr_err("SRAM: Could not map\n");
193 omap_sram_ceil = omap_sram_base + omap_sram_size;
196 * Looks like we need to preserve some bootloader code at the
197 * beginning of SRAM for jumping to flash for reboot to work...
199 memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
200 omap_sram_size - SRAM_BOOTLOADER_SZ);
204 * Memory allocator for SRAM: calculates the new ceiling address
205 * for pushing a function using the fncpy API.
207 * Note that fncpy requires the returned address to be aligned
208 * to an 8-byte boundary.
210 void *omap_sram_push_address(unsigned long size)
212 unsigned long available, new_ceil = (unsigned long)omap_sram_ceil;
214 available = omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ);
216 if (size > available) {
217 pr_err("Not enough space in SRAM\n");
222 new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
223 omap_sram_ceil = IOMEM(new_ceil);
225 return (void *)omap_sram_ceil;
228 #ifdef CONFIG_ARCH_OMAP1
230 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
232 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
234 BUG_ON(!_omap_sram_reprogram_clock);
235 /* On 730, bit 13 must always be 1 */
236 if (cpu_is_omap7xx())
238 _omap_sram_reprogram_clock(dpllctl, ckctl);
241 static int __init omap1_sram_init(void)
243 _omap_sram_reprogram_clock =
244 omap_sram_push(omap1_sram_reprogram_clock,
245 omap1_sram_reprogram_clock_sz);
251 #define omap1_sram_init() do {} while (0)
254 #if defined(CONFIG_ARCH_OMAP2)
256 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
257 u32 base_cs, u32 force_unlock);
259 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
260 u32 base_cs, u32 force_unlock)
262 BUG_ON(!_omap2_sram_ddr_init);
263 _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
264 base_cs, force_unlock);
267 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
270 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
272 BUG_ON(!_omap2_sram_reprogram_sdrc);
273 _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
276 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
278 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
280 BUG_ON(!_omap2_set_prcm);
281 return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
285 #ifdef CONFIG_SOC_OMAP2420
286 static int __init omap242x_sram_init(void)
288 _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
289 omap242x_sram_ddr_init_sz);
291 _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
292 omap242x_sram_reprogram_sdrc_sz);
294 _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
295 omap242x_sram_set_prcm_sz);
300 static inline int omap242x_sram_init(void)
306 #ifdef CONFIG_SOC_OMAP2430
307 static int __init omap243x_sram_init(void)
309 _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
310 omap243x_sram_ddr_init_sz);
312 _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
313 omap243x_sram_reprogram_sdrc_sz);
315 _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
316 omap243x_sram_set_prcm_sz);
321 static inline int omap243x_sram_init(void)
327 #ifdef CONFIG_ARCH_OMAP3
329 static u32 (*_omap3_sram_configure_core_dpll)(
330 u32 m2, u32 unlock_dll, u32 f, u32 inc,
331 u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
332 u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
333 u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
334 u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
336 u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
337 u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
338 u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
339 u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
340 u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
342 BUG_ON(!_omap3_sram_configure_core_dpll);
343 return _omap3_sram_configure_core_dpll(
344 m2, unlock_dll, f, inc,
345 sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
346 sdrc_actim_ctrl_b_0, sdrc_mr_0,
347 sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
348 sdrc_actim_ctrl_b_1, sdrc_mr_1);
351 void omap3_sram_restore_context(void)
353 omap_sram_ceil = omap_sram_base + omap_sram_size;
355 _omap3_sram_configure_core_dpll =
356 omap_sram_push(omap3_sram_configure_core_dpll,
357 omap3_sram_configure_core_dpll_sz);
358 omap_push_sram_idle();
361 static inline int omap34xx_sram_init(void)
363 omap3_sram_restore_context();
367 static inline int omap34xx_sram_init(void)
371 #endif /* CONFIG_ARCH_OMAP3 */
373 static inline int am33xx_sram_init(void)
378 int __init omap_sram_init(void)
383 if (!(cpu_class_is_omap2()))
385 else if (cpu_is_omap242x())
386 omap242x_sram_init();
387 else if (cpu_is_omap2430())
388 omap243x_sram_init();
389 else if (cpu_is_am33xx())
391 else if (cpu_is_omap34xx())
392 omap34xx_sram_init();