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Linux/arch/arm/plat-omap/sram.c

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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 
 23 #include <asm/tlb.h>
 24 #include <asm/cacheflush.h>
 25 
 26 #include <asm/mach/map.h>
 27 
 28 #include <mach/sram.h>
 29 #include <mach/board.h>
 30 #include <mach/cpu.h>
 31 
 32 #include <mach/control.h>
 33 
 34 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 35 # include "../mach-omap2/prm.h"
 36 # include "../mach-omap2/cm.h"
 37 # include "../mach-omap2/sdrc.h"
 38 #endif
 39 
 40 #define OMAP1_SRAM_PA           0x20000000
 41 #define OMAP1_SRAM_VA           VMALLOC_END
 42 #define OMAP2_SRAM_PA           0x40200000
 43 #define OMAP2_SRAM_PUB_PA       0x4020f800
 44 #define OMAP2_SRAM_VA           0xe3000000
 45 #define OMAP2_SRAM_PUB_VA       (OMAP2_SRAM_VA + 0x800)
 46 #define OMAP3_SRAM_PA           0x40200000
 47 #define OMAP3_SRAM_VA           0xe3000000
 48 #define OMAP3_SRAM_PUB_PA       0x40208000
 49 #define OMAP3_SRAM_PUB_VA       (OMAP3_SRAM_VA + 0x8000)
 50 #define OMAP4_SRAM_PA           0x40200000              /*0x402f0000*/
 51 #define OMAP4_SRAM_VA           0xd7000000              /*0xd70f0000*/
 52 
 53 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
 54 #define SRAM_BOOTLOADER_SZ      0x00
 55 #else
 56 #define SRAM_BOOTLOADER_SZ      0x80
 57 #endif
 58 
 59 #define OMAP24XX_VA_REQINFOPERM0        OMAP2_IO_ADDRESS(0x68005048)
 60 #define OMAP24XX_VA_READPERM0           OMAP2_IO_ADDRESS(0x68005050)
 61 #define OMAP24XX_VA_WRITEPERM0          OMAP2_IO_ADDRESS(0x68005058)
 62 
 63 #define OMAP34XX_VA_REQINFOPERM0        OMAP2_IO_ADDRESS(0x68012848)
 64 #define OMAP34XX_VA_READPERM0           OMAP2_IO_ADDRESS(0x68012850)
 65 #define OMAP34XX_VA_WRITEPERM0          OMAP2_IO_ADDRESS(0x68012858)
 66 #define OMAP34XX_VA_ADDR_MATCH2         OMAP2_IO_ADDRESS(0x68012880)
 67 #define OMAP34XX_VA_SMS_RG_ATT0         OMAP2_IO_ADDRESS(0x6C000048)
 68 #define OMAP34XX_VA_CONTROL_STAT        OMAP2_IO_ADDRESS(0x480022F0)
 69 
 70 #define GP_DEVICE               0x300
 71 
 72 #define ROUND_DOWN(value,boundary)      ((value) & (~((boundary)-1)))
 73 
 74 static unsigned long omap_sram_start;
 75 static unsigned long omap_sram_base;
 76 static unsigned long omap_sram_size;
 77 static unsigned long omap_sram_ceil;
 78 
 79 extern unsigned long omapfb_reserve_sram(unsigned long sram_pstart,
 80                                          unsigned long sram_vstart,
 81                                          unsigned long sram_size,
 82                                          unsigned long pstart_avail,
 83                                          unsigned long size_avail);
 84 
 85 /*
 86  * Depending on the target RAMFS firewall setup, the public usable amount of
 87  * SRAM varies.  The default accessible size for all device types is 2k. A GP
 88  * device allows ARM11 but not other initiators for full size. This
 89  * functionality seems ok until some nice security API happens.
 90  */
 91 static int is_sram_locked(void)
 92 {
 93         int type = 0;
 94 
 95         if (cpu_is_omap44xx())
 96                 /* Not yet supported */
 97                 return 0;
 98 
 99         if (cpu_is_omap242x())
100                 type = omap_rev() & OMAP2_DEVICETYPE_MASK;
101 
102         if (type == GP_DEVICE) {
103                 /* RAMFW: R/W access to all initiators for all qualifier sets */
104                 if (cpu_is_omap242x()) {
105                         __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
106                         __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
107                         __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
108                 }
109                 if (cpu_is_omap34xx()) {
110                         __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
111                         __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
112                         __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
113                         __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
114                         __raw_writel(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
115                 }
116                 return 0;
117         } else
118                 return 1; /* assume locked with no PPA or security driver */
119 }
120 
121 /*
122  * The amount of SRAM depends on the core type.
123  * Note that we cannot try to test for SRAM here because writes
124  * to secure SRAM will hang the system. Also the SRAM is not
125  * yet mapped at this point.
126  */
127 void __init omap_detect_sram(void)
128 {
129         unsigned long reserved;
130 
131         if (cpu_class_is_omap2()) {
132                 if (is_sram_locked()) {
133                         if (cpu_is_omap34xx()) {
134                                 omap_sram_base = OMAP3_SRAM_PUB_VA;
135                                 omap_sram_start = OMAP3_SRAM_PUB_PA;
136                                 if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
137                                     (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
138                                         omap_sram_size = 0x7000; /* 28K */
139                                 } else {
140                                         omap_sram_size = 0x8000; /* 32K */
141                                 }
142                         } else {
143                                 omap_sram_base = OMAP2_SRAM_PUB_VA;
144                                 omap_sram_start = OMAP2_SRAM_PUB_PA;
145                                 omap_sram_size = 0x800; /* 2K */
146                         }
147                 } else {
148                         if (cpu_is_omap34xx()) {
149                                 omap_sram_base = OMAP3_SRAM_VA;
150                                 omap_sram_start = OMAP3_SRAM_PA;
151                                 omap_sram_size = 0x10000; /* 64K */
152                         } else if (cpu_is_omap44xx()) {
153                                 omap_sram_base = OMAP4_SRAM_VA;
154                                 omap_sram_start = OMAP4_SRAM_PA;
155                                 omap_sram_size = 0x8000; /* 32K */
156                         } else {
157                                 omap_sram_base = OMAP2_SRAM_VA;
158                                 omap_sram_start = OMAP2_SRAM_PA;
159                                 if (cpu_is_omap242x())
160                                         omap_sram_size = 0xa0000; /* 640K */
161                                 else if (cpu_is_omap243x())
162                                         omap_sram_size = 0x10000; /* 64K */
163                         }
164                 }
165         } else {
166                 omap_sram_base = OMAP1_SRAM_VA;
167                 omap_sram_start = OMAP1_SRAM_PA;
168 
169                 if (cpu_is_omap7xx())
170                         omap_sram_size = 0x32000;       /* 200K */
171                 else if (cpu_is_omap15xx())
172                         omap_sram_size = 0x30000;       /* 192K */
173                 else if (cpu_is_omap1610() || cpu_is_omap1621() ||
174                      cpu_is_omap1710())
175                         omap_sram_size = 0x4000;        /* 16K */
176                 else if (cpu_is_omap1611())
177                         omap_sram_size = 0x3e800;       /* 250K */
178                 else {
179                         printk(KERN_ERR "Could not detect SRAM size\n");
180                         omap_sram_size = 0x4000;
181                 }
182         }
183         reserved = omapfb_reserve_sram(omap_sram_start, omap_sram_base,
184                                        omap_sram_size,
185                                        omap_sram_start + SRAM_BOOTLOADER_SZ,
186                                        omap_sram_size - SRAM_BOOTLOADER_SZ);
187         omap_sram_size -= reserved;
188         omap_sram_ceil = omap_sram_base + omap_sram_size;
189 }
190 
191 static struct map_desc omap_sram_io_desc[] __initdata = {
192         {       /* .length gets filled in at runtime */
193                 .virtual        = OMAP1_SRAM_VA,
194                 .pfn            = __phys_to_pfn(OMAP1_SRAM_PA),
195                 .type           = MT_MEMORY
196         }
197 };
198 
199 /*
200  * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
201  */
202 void __init omap_map_sram(void)
203 {
204         unsigned long base;
205 
206         if (omap_sram_size == 0)
207                 return;
208 
209         if (cpu_is_omap24xx()) {
210                 omap_sram_io_desc[0].virtual = OMAP2_SRAM_VA;
211 
212                 base = OMAP2_SRAM_PA;
213                 base = ROUND_DOWN(base, PAGE_SIZE);
214                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
215         }
216 
217         if (cpu_is_omap34xx()) {
218                 omap_sram_io_desc[0].virtual = OMAP3_SRAM_VA;
219                 base = OMAP3_SRAM_PA;
220                 base = ROUND_DOWN(base, PAGE_SIZE);
221                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
222 
223                 /*
224                  * SRAM must be marked as non-cached on OMAP3 since the
225                  * CORE DPLL M2 divider change code (in SRAM) runs with the
226                  * SDRAM controller disabled, and if it is marked cached,
227                  * the ARM may attempt to write cache lines back to SDRAM
228                  * which will cause the system to hang.
229                  */
230                 omap_sram_io_desc[0].type = MT_MEMORY_NONCACHED;
231         }
232 
233         if (cpu_is_omap44xx()) {
234                 omap_sram_io_desc[0].virtual = OMAP4_SRAM_VA;
235                 base = OMAP4_SRAM_PA;
236                 base = ROUND_DOWN(base, PAGE_SIZE);
237                 omap_sram_io_desc[0].pfn = __phys_to_pfn(base);
238         }
239         omap_sram_io_desc[0].length = 1024 * 1024;      /* Use section desc */
240         iotable_init(omap_sram_io_desc, ARRAY_SIZE(omap_sram_io_desc));
241 
242         printk(KERN_INFO "SRAM: Mapped pa 0x%08lx to va 0x%08lx size: 0x%lx\n",
243         __pfn_to_phys(omap_sram_io_desc[0].pfn),
244         omap_sram_io_desc[0].virtual,
245                omap_sram_io_desc[0].length);
246 
247         /*
248          * Normally devicemaps_init() would flush caches and tlb after
249          * mdesc->map_io(), but since we're called from map_io(), we
250          * must do it here.
251          */
252         local_flush_tlb_all();
253         flush_cache_all();
254 
255         /*
256          * Looks like we need to preserve some bootloader code at the
257          * beginning of SRAM for jumping to flash for reboot to work...
258          */
259         memset((void *)omap_sram_base + SRAM_BOOTLOADER_SZ, 0,
260                omap_sram_size - SRAM_BOOTLOADER_SZ);
261 }
262 
263 void * omap_sram_push(void * start, unsigned long size)
264 {
265         if (size > (omap_sram_ceil - (omap_sram_base + SRAM_BOOTLOADER_SZ))) {
266                 printk(KERN_ERR "Not enough space in SRAM\n");
267                 return NULL;
268         }
269 
270         omap_sram_ceil -= size;
271         omap_sram_ceil = ROUND_DOWN(omap_sram_ceil, sizeof(void *));
272         memcpy((void *)omap_sram_ceil, start, size);
273         flush_icache_range((unsigned long)omap_sram_ceil,
274                 (unsigned long)(omap_sram_ceil + size));
275 
276         return (void *)omap_sram_ceil;
277 }
278 
279 #ifdef CONFIG_ARCH_OMAP1
280 
281 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
282 
283 void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
284 {
285         BUG_ON(!_omap_sram_reprogram_clock);
286         _omap_sram_reprogram_clock(dpllctl, ckctl);
287 }
288 
289 int __init omap1_sram_init(void)
290 {
291         _omap_sram_reprogram_clock =
292                         omap_sram_push(omap1_sram_reprogram_clock,
293                                         omap1_sram_reprogram_clock_sz);
294 
295         return 0;
296 }
297 
298 #else
299 #define omap1_sram_init()       do {} while (0)
300 #endif
301 
302 #if defined(CONFIG_ARCH_OMAP2)
303 
304 static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
305                               u32 base_cs, u32 force_unlock);
306 
307 void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
308                    u32 base_cs, u32 force_unlock)
309 {
310         BUG_ON(!_omap2_sram_ddr_init);
311         _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
312                              base_cs, force_unlock);
313 }
314 
315 static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
316                                           u32 mem_type);
317 
318 void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
319 {
320         BUG_ON(!_omap2_sram_reprogram_sdrc);
321         _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
322 }
323 
324 static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
325 
326 u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
327 {
328         BUG_ON(!_omap2_set_prcm);
329         return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
330 }
331 #endif
332 
333 #ifdef CONFIG_ARCH_OMAP2420
334 int __init omap242x_sram_init(void)
335 {
336         _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
337                                         omap242x_sram_ddr_init_sz);
338 
339         _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
340                                             omap242x_sram_reprogram_sdrc_sz);
341 
342         _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
343                                          omap242x_sram_set_prcm_sz);
344 
345         return 0;
346 }
347 #else
348 static inline int omap242x_sram_init(void)
349 {
350         return 0;
351 }
352 #endif
353 
354 #ifdef CONFIG_ARCH_OMAP2430
355 int __init omap243x_sram_init(void)
356 {
357         _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
358                                         omap243x_sram_ddr_init_sz);
359 
360         _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
361                                             omap243x_sram_reprogram_sdrc_sz);
362 
363         _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
364                                          omap243x_sram_set_prcm_sz);
365 
366         return 0;
367 }
368 #else
369 static inline int omap243x_sram_init(void)
370 {
371         return 0;
372 }
373 #endif
374 
375 #ifdef CONFIG_ARCH_OMAP3
376 
377 static u32 (*_omap3_sram_configure_core_dpll)(
378                         u32 m2, u32 unlock_dll, u32 f, u32 inc,
379                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
380                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
381                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
382                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
383 
384 u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
385                         u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
386                         u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
387                         u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
388                         u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
389 {
390         BUG_ON(!_omap3_sram_configure_core_dpll);
391         return _omap3_sram_configure_core_dpll(
392                         m2, unlock_dll, f, inc,
393                         sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
394                         sdrc_actim_ctrl_b_0, sdrc_mr_0,
395                         sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
396                         sdrc_actim_ctrl_b_1, sdrc_mr_1);
397 }
398 
399 /* REVISIT: Should this be same as omap34xx_sram_init() after off-idle? */
400 void restore_sram_functions(void)
401 {
402         omap_sram_ceil = omap_sram_base + omap_sram_size;
403 
404         _omap3_sram_configure_core_dpll =
405                 omap_sram_push(omap3_sram_configure_core_dpll,
406                                omap3_sram_configure_core_dpll_sz);
407 }
408 
409 int __init omap34xx_sram_init(void)
410 {
411         _omap3_sram_configure_core_dpll =
412                 omap_sram_push(omap3_sram_configure_core_dpll,
413                                omap3_sram_configure_core_dpll_sz);
414 
415         return 0;
416 }
417 #else
418 static inline int omap34xx_sram_init(void)
419 {
420         return 0;
421 }
422 #endif
423 
424 int __init omap_sram_init(void)
425 {
426         omap_detect_sram();
427         omap_map_sram();
428 
429         if (!(cpu_class_is_omap2()))
430                 omap1_sram_init();
431         else if (cpu_is_omap242x())
432                 omap242x_sram_init();
433         else if (cpu_is_omap2430())
434                 omap243x_sram_init();
435         else if (cpu_is_omap34xx())
436                 omap34xx_sram_init();
437         else if (cpu_is_omap44xx())
438                 omap34xx_sram_init(); /* FIXME: */
439 
440         return 0;
441 }
442 

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