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1/*
2 * linux/arch/arm/plat-omap/sram.c
3 *
4 * OMAP SRAM detection and management
5 *
6 * Copyright (C) 2005 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
8 *
9 * Copyright (C) 2009 Texas Instruments
10 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
11 *
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.
15 */
16#undef DEBUG
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/io.h>
22#include <linux/omapfb.h>
23
24#include <asm/tlb.h>
25#include <asm/cacheflush.h>
26
27#include <asm/mach/map.h>
28
29#include <plat/sram.h>
30#include <plat/board.h>
31#include <plat/cpu.h>
32#include <plat/vram.h>
33
34#include "sram.h"
35#include "fb.h"
36
37/* XXX These "sideways" includes are a sign that something is wrong */
38#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
39# include "../mach-omap2/prm2xxx_3xxx.h"
40# include "../mach-omap2/sdrc.h"
41#endif
42
43#define OMAP1_SRAM_PA 0x20000000
44#define OMAP1_SRAM_VA VMALLOC_END
45#define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800)
46#define OMAP2_SRAM_VA 0xfe400000
47#define OMAP2_SRAM_PUB_VA (OMAP2_SRAM_VA + 0x800)
48#define OMAP3_SRAM_VA 0xfe400000
49#define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000)
50#define OMAP3_SRAM_PUB_VA (OMAP3_SRAM_VA + 0x8000)
51#define OMAP4_SRAM_VA 0xfe400000
52#define OMAP4_SRAM_PUB_PA (OMAP4_SRAM_PA + 0x4000)
53#define OMAP4_SRAM_PUB_VA (OMAP4_SRAM_VA + 0x4000)
54
55#if defined(CONFIG_ARCH_OMAP2PLUS)
56#define SRAM_BOOTLOADER_SZ 0x00
57#else
58#define SRAM_BOOTLOADER_SZ 0x80
59#endif
60
61#define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048)
62#define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050)
63#define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058)
64
65#define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848)
66#define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850)
67#define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858)
68#define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880)
69#define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048)
70
71#define GP_DEVICE 0x300
72
73#define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
74
75static unsigned long omap_sram_start;
76static unsigned long omap_sram_base;
77static unsigned long omap_sram_size;
78static unsigned long omap_sram_ceil;
79
80/*
81 * Depending on the target RAMFS firewall setup, the public usable amount of
82 * SRAM varies. The default accessible size for all device types is 2k. A GP
83 * device allows ARM11 but not other initiators for full size. This
84 * functionality seems ok until some nice security API happens.
85 */
86static int is_sram_locked(void)
87{
88 if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
89 /* RAMFW: R/W access to all initiators for all qualifier sets */
90 if (cpu_is_omap242x()) {
91 __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
92 __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
93 __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
94 }
95 if (cpu_is_omap34xx()) {
96 __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
97 __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
98 __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
99 __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
100 __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
101 }
102 return 0;
103 } else
104 return 1; /* assume locked with no PPA or security driver */
105}
106
107/*
108 * The amount of SRAM depends on the core type.
109 * Note that we cannot try to test for SRAM here because writes
110 * to secure SRAM will hang the system. Also the SRAM is not
111 * yet mapped at this point.
112 */
113static void __init omap_detect_sram(void)
114{
115 unsigned long reserved;
116
117 if (cpu_class_is_omap2()) {
118 if (is_sram_locked()) {
119 if (cpu_is_omap34xx()) {
120 omap_sram_base = OMAP3_SRAM_PUB_VA;
121 omap_sram_start = OMAP3_SRAM_PUB_PA;
122 if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
123 (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
124 omap_sram_size = 0x7000; /* 28K */
125 } else {
126 omap_sram_size = 0x8000; /* 32K */
127 }
128 } else if (cpu_is_omap44xx()) {
129 omap_sram_base = OMAP4_SRAM_PUB_VA;
130 omap_sram_start = OMAP4_SRAM_PUB_PA;
131 omap_sram_size = 0xa000; /* 40K */
132 } else {
133 omap_sram_base = OMAP2_SRAM_PUB_VA;
134 omap_sram_start = OMAP2_SRAM_PUB_PA;
135 omap_sram_size = 0x800; /* 2K */
136 }
137 } else {
138 if (cpu_is_omap34xx()) {
139 omap_sram_base = OMAP3_SRAM_VA;
140 omap_sram_start = OMAP3_SRAM_PA;
141 omap_sram_size = 0x10000; /* 64K */
142 } else if (cpu_is_omap44xx()) {
143 omap_sram_base = OMAP4_SRAM_VA;
144 omap_sram_start = OMAP4_SRAM_PA;
145 omap_sram_size = 0xe000; /* 56K */
146 } else {
147 omap_sram_base = OMAP2_SRAM_VA;
148 omap_sram_start = OMAP2_SRAM_PA;
149 if (cpu_is_omap242x())
150 omap_sram_size = 0xa0000; /* 640K */
151 else if (cpu_is_omap243x())
152 omap_sram_size = 0x10000; /* 64K */
153 }
154 }
155 } else {
156 omap_sram_base = OMAP1_SRAM_VA;
157 omap_sram_start = OMAP1_SRAM_PA;
158
159 if (cpu_is_omap7xx())
160 omap_sram_size = 0x32000; /* 200K */
161 else if (cpu_is_omap15xx())
162 omap_sram_size = 0x30000; /* 192K */
163 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
164 cpu_is_omap1710())
165 omap_sram_size = 0x4000; /* 16K */
166 else if (cpu_is_omap1611())
167 omap_sram_size = SZ_256K;
168 else {
169 pr_err("Could not detect SRAM size\n");
170 omap_sram_size = 0x4000;
171 }
172 }
173 reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
174 omap_sram_size,
175 omap_sram_start + SRAM_BOOTLOADER_SZ,
176 omap_sram_size - SRAM_BOOTLOADER_SZ);
177 omap_sram_size -= reserved;
178
179 reserved = omap_vram_reserve_sram(omap_sram_start, omap_sram_base,
180 omap_sram_size,
181 omap_sram_start + SRAM_BOOTLOADER_SZ,
182 omap_sram_size - SRAM_BOOTLOADER_SZ);
183 omap_sram_size -= reserved;
184
185 omap_sram_ceil = omap_sram_base + omap_sram_size;
186}
187
188static struct map_desc omap_sram_io_desc[] __initdata = {
189 { /* .length gets filled in at runtime */
190 .virtual = OMAP1_SRAM_VA,
191 .pfn = __phys_to_pfn(OMAP1_SRAM_PA),
192 .type = MT_MEMORY
193 }
194};
195
196/*
197 * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
198 */
199static void __init omap_map_sram(void)
200{
201 unsigned long base;
202
203 if (omap_sram_size == 0)
204 return;
205
206 if (cpu_is_omap34xx()) {
207 /*
208 * SRAM must be marked as non-cached on OMAP3 since the
209 * CORE DPLL M2 divider change code (in SRAM) runs with the
210 * SDRAM controller disabled, and if it is marked cached,
211 * the ARM may attempt to write cache lines back to SDRAM
212 * which will cause the system to hang.
213 */
214 omap_sram_io_desc[0].type = MT_MEMORY_NONCACHED;
215 }
216
217 omap_sram_io_desc[0].virtual = omap_sram_base;
218 base = omap_sram_start;
219 base = ROUND_DOWN(base, PAGE_SIZE);
220 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
221 omap_sram_io_desc[0].length = ROUND_DOWN(omap_sram_size, PAGE_SIZE);
222 iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
223
224 pr_info("SRAM: Mapped pa 0x%08llx to va 0x%08lx size: 0x%lx\n",
225 (long long) __pfn_to_phys(omap_sram_io_desc[0].pfn),
226 omap_sram_io_desc[0].virtual,
227 omap_sram_io_desc[0].length);
228
229 /*
230 * Normally devicemaps_init() would flush caches and tlb after
231 * mdesc->map_io(), but since we're called from map_io(), we
232 * must do it here.
233 */
234 local_flush_tlb_all();
235 flush_cache_all();
236
237 /*
238 * Looks like we need to preserve some bootloader code at the
239 * beginning of SRAM for jumping to flash for reboot to work...
240 */
241 memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
242 omap_sram_size - SRAM_BOOTLOADER_SZ);
243}
244
245/*
246 * Memory allocator for SRAM: calculates the new ceiling address
247 * for pushing a function using the fncpy API.
248 *
249 * Note that fncpy requires the returned address to be aligned
250 * to an 8-byte boundary.
251 */
252void *omap_sram_push_address(unsigned long size)
253{
254 if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
255 pr_err("Not enough space in SRAM\n");
256 return NULL;
257 }
258
259 omap_sram_ceil -= size;
260 omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, FNCPY_ALIGN);
261
262 return (void *)omap_sram_ceil;
263}
264
265#ifdef CONFIG_ARCH_OMAP1
266
267static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
268
269void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
270{
271 BUG_ON(!_omap_sram_reprogram_clock);
272 _omap_sram_reprogram_clock(dpllctl, ckctl);
273}
274
275static int __init omap1_sram_init(void)
276{
277 _omap_sram_reprogram_clock =
278 omap_sram_push(omap1_sram_reprogram_clock,
279 omap1_sram_reprogram_clock_sz);
280
281 return 0;
282}
283
284#else
285#define omap1_sram_init() do {} while (0)
286#endif
287
288#if defined(CONFIG_ARCH_OMAP2)
289
290static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
291 u32 base_cs, u32 force_unlock);
292
293void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
294 u32 base_cs, u32 force_unlock)
295{
296 BUG_ON(!_omap2_sram_ddr_init);
297 _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
298 base_cs, force_unlock);
299}
300
301static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
302 u32 mem_type);
303
304void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
305{
306 BUG_ON(!_omap2_sram_reprogram_sdrc);
307 _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
308}
309
310static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
311
312u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
313{
314 BUG_ON(!_omap2_set_prcm);
315 return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
316}
317#endif
318
319#ifdef CONFIG_SOC_OMAP2420
320static int __init omap242x_sram_init(void)
321{
322 _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
323 omap242x_sram_ddr_init_sz);
324
325 _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
326 omap242x_sram_reprogram_sdrc_sz);
327
328 _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
329 omap242x_sram_set_prcm_sz);
330
331 return 0;
332}
333#else
334static inline int omap242x_sram_init(void)
335{
336 return 0;
337}
338#endif
339
340#ifdef CONFIG_SOC_OMAP2430
341static int __init omap243x_sram_init(void)
342{
343 _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
344 omap243x_sram_ddr_init_sz);
345
346 _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
347 omap243x_sram_reprogram_sdrc_sz);
348
349 _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
350 omap243x_sram_set_prcm_sz);
351
352 return 0;
353}
354#else
355static inline int omap243x_sram_init(void)
356{
357 return 0;
358}
359#endif
360
361#ifdef CONFIG_ARCH_OMAP3
362
363static u32 (*_omap3_sram_configure_core_dpll)(
364 u32 m2, u32 unlock_dll, u32 f, u32 inc,
365 u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
366 u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
367 u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
368 u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
369
370u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
371 u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
372 u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
373 u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
374 u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
375{
376 BUG_ON(!_omap3_sram_configure_core_dpll);
377 return _omap3_sram_configure_core_dpll(
378 m2, unlock_dll, f, inc,
379 sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
380 sdrc_actim_ctrl_b_0, sdrc_mr_0,
381 sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
382 sdrc_actim_ctrl_b_1, sdrc_mr_1);
383}
384
385#ifdef CONFIG_PM
386void omap3_sram_restore_context(void)
387{
388 omap_sram_ceil = omap_sram_base + omap_sram_size;
389
390 _omap3_sram_configure_core_dpll =
391 omap_sram_push(omap3_sram_configure_core_dpll,
392 omap3_sram_configure_core_dpll_sz);
393 omap_push_sram_idle();
394}
395#endif /* CONFIG_PM */
396
397#endif /* CONFIG_ARCH_OMAP3 */
398
399static inline int omap34xx_sram_init(void)
400{
401#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
402 omap3_sram_restore_context();
403#endif
404 return 0;
405}
406
407int __init omap_sram_init(void)
408{
409 omap_detect_sram();
410 omap_map_sram();
411
412 if (!(cpu_class_is_omap2()))
413 omap1_sram_init();
414 else if (cpu_is_omap242x())
415 omap242x_sram_init();
416 else if (cpu_is_omap2430())
417 omap243x_sram_init();
418 else if (cpu_is_omap34xx())
419 omap34xx_sram_init();
420
421 return 0;
422}