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bb772094 TL |
1 | /* |
2 | * | |
3 | * OMAP SRAM detection and management | |
4 | * | |
5 | * Copyright (C) 2005 Nokia Corporation | |
6 | * Written by Tony Lindgren <tony@atomide.com> | |
7 | * | |
8 | * Copyright (C) 2009-2012 Texas Instruments | |
9 | * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/io.h> | |
20 | ||
21 | #include <asm/fncpy.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/cacheflush.h> | |
24 | ||
25 | #include <asm/mach/map.h> | |
26 | ||
27 | #include "soc.h" | |
28 | #include "iomap.h" | |
29 | #include "prm2xxx_3xxx.h" | |
30 | #include "sdrc.h" | |
31 | #include "sram.h" | |
32 | ||
33 | #define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800) | |
34 | #define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000) | |
bb772094 TL |
35 | |
36 | #define SRAM_BOOTLOADER_SZ 0x00 | |
37 | ||
38 | #define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048) | |
39 | #define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050) | |
40 | #define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058) | |
41 | ||
42 | #define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848) | |
43 | #define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850) | |
44 | #define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858) | |
45 | #define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880) | |
46 | #define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048) | |
47 | ||
48 | #define GP_DEVICE 0x300 | |
49 | ||
50 | #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1))) | |
51 | ||
52 | static unsigned long omap_sram_start; | |
53 | static unsigned long omap_sram_skip; | |
54 | static unsigned long omap_sram_size; | |
55 | ||
56 | /* | |
57 | * Depending on the target RAMFS firewall setup, the public usable amount of | |
58 | * SRAM varies. The default accessible size for all device types is 2k. A GP | |
59 | * device allows ARM11 but not other initiators for full size. This | |
60 | * functionality seems ok until some nice security API happens. | |
61 | */ | |
62 | static int is_sram_locked(void) | |
63 | { | |
64 | if (OMAP2_DEVICE_TYPE_GP == omap_type()) { | |
65 | /* RAMFW: R/W access to all initiators for all qualifier sets */ | |
66 | if (cpu_is_omap242x()) { | |
edfaf05c VK |
67 | writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */ |
68 | writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */ | |
69 | writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */ | |
bb772094 TL |
70 | } |
71 | if (cpu_is_omap34xx()) { | |
edfaf05c VK |
72 | writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */ |
73 | writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */ | |
74 | writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */ | |
75 | writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2); | |
76 | writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0); | |
bb772094 TL |
77 | } |
78 | return 0; | |
79 | } else | |
80 | return 1; /* assume locked with no PPA or security driver */ | |
81 | } | |
82 | ||
83 | /* | |
84 | * The amount of SRAM depends on the core type. | |
85 | * Note that we cannot try to test for SRAM here because writes | |
86 | * to secure SRAM will hang the system. Also the SRAM is not | |
87 | * yet mapped at this point. | |
88 | */ | |
89 | static void __init omap_detect_sram(void) | |
90 | { | |
91 | omap_sram_skip = SRAM_BOOTLOADER_SZ; | |
92 | if (is_sram_locked()) { | |
93 | if (cpu_is_omap34xx()) { | |
94 | omap_sram_start = OMAP3_SRAM_PUB_PA; | |
95 | if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) || | |
96 | (omap_type() == OMAP2_DEVICE_TYPE_SEC)) { | |
97 | omap_sram_size = 0x7000; /* 28K */ | |
98 | omap_sram_skip += SZ_16K; | |
99 | } else { | |
100 | omap_sram_size = 0x8000; /* 32K */ | |
101 | } | |
bb772094 TL |
102 | } else { |
103 | omap_sram_start = OMAP2_SRAM_PUB_PA; | |
104 | omap_sram_size = 0x800; /* 2K */ | |
105 | } | |
106 | } else { | |
8b9a2810 | 107 | if (cpu_is_omap34xx()) { |
bb772094 TL |
108 | omap_sram_start = OMAP3_SRAM_PA; |
109 | omap_sram_size = 0x10000; /* 64K */ | |
bb772094 TL |
110 | } else { |
111 | omap_sram_start = OMAP2_SRAM_PA; | |
112 | if (cpu_is_omap242x()) | |
113 | omap_sram_size = 0xa0000; /* 640K */ | |
114 | else if (cpu_is_omap243x()) | |
115 | omap_sram_size = 0x10000; /* 64K */ | |
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | /* | |
121 | * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early. | |
122 | */ | |
123 | static void __init omap2_map_sram(void) | |
124 | { | |
125 | int cached = 1; | |
126 | ||
bb772094 TL |
127 | if (cpu_is_omap34xx()) { |
128 | /* | |
129 | * SRAM must be marked as non-cached on OMAP3 since the | |
130 | * CORE DPLL M2 divider change code (in SRAM) runs with the | |
131 | * SDRAM controller disabled, and if it is marked cached, | |
132 | * the ARM may attempt to write cache lines back to SDRAM | |
133 | * which will cause the system to hang. | |
134 | */ | |
135 | cached = 0; | |
136 | } | |
137 | ||
138 | omap_map_sram(omap_sram_start, omap_sram_size, | |
139 | omap_sram_skip, cached); | |
140 | } | |
141 | ||
142 | static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, | |
143 | u32 base_cs, u32 force_unlock); | |
144 | ||
145 | void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl, | |
146 | u32 base_cs, u32 force_unlock) | |
147 | { | |
148 | BUG_ON(!_omap2_sram_ddr_init); | |
149 | _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl, | |
150 | base_cs, force_unlock); | |
151 | } | |
152 | ||
153 | static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val, | |
154 | u32 mem_type); | |
155 | ||
156 | void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type) | |
157 | { | |
158 | BUG_ON(!_omap2_sram_reprogram_sdrc); | |
159 | _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type); | |
160 | } | |
161 | ||
162 | static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass); | |
163 | ||
164 | u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass) | |
165 | { | |
166 | BUG_ON(!_omap2_set_prcm); | |
167 | return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass); | |
168 | } | |
169 | ||
170 | #ifdef CONFIG_SOC_OMAP2420 | |
171 | static int __init omap242x_sram_init(void) | |
172 | { | |
173 | _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init, | |
174 | omap242x_sram_ddr_init_sz); | |
175 | ||
176 | _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc, | |
177 | omap242x_sram_reprogram_sdrc_sz); | |
178 | ||
179 | _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm, | |
180 | omap242x_sram_set_prcm_sz); | |
181 | ||
182 | return 0; | |
183 | } | |
184 | #else | |
185 | static inline int omap242x_sram_init(void) | |
186 | { | |
187 | return 0; | |
188 | } | |
189 | #endif | |
190 | ||
191 | #ifdef CONFIG_SOC_OMAP2430 | |
192 | static int __init omap243x_sram_init(void) | |
193 | { | |
194 | _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init, | |
195 | omap243x_sram_ddr_init_sz); | |
196 | ||
197 | _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc, | |
198 | omap243x_sram_reprogram_sdrc_sz); | |
199 | ||
200 | _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm, | |
201 | omap243x_sram_set_prcm_sz); | |
202 | ||
203 | return 0; | |
204 | } | |
205 | #else | |
206 | static inline int omap243x_sram_init(void) | |
207 | { | |
208 | return 0; | |
209 | } | |
210 | #endif | |
211 | ||
212 | #ifdef CONFIG_ARCH_OMAP3 | |
213 | ||
bb772094 TL |
214 | void omap3_sram_restore_context(void) |
215 | { | |
216 | omap_sram_reset(); | |
217 | ||
bb772094 TL |
218 | omap_push_sram_idle(); |
219 | } | |
220 | ||
221 | static inline int omap34xx_sram_init(void) | |
222 | { | |
223 | omap3_sram_restore_context(); | |
224 | return 0; | |
225 | } | |
226 | #else | |
227 | static inline int omap34xx_sram_init(void) | |
228 | { | |
229 | return 0; | |
230 | } | |
231 | #endif /* CONFIG_ARCH_OMAP3 */ | |
232 | ||
bb772094 TL |
233 | int __init omap_sram_init(void) |
234 | { | |
235 | omap_detect_sram(); | |
236 | omap2_map_sram(); | |
237 | ||
238 | if (cpu_is_omap242x()) | |
239 | omap242x_sram_init(); | |
240 | else if (cpu_is_omap2430()) | |
241 | omap243x_sram_init(); | |
bb772094 TL |
242 | else if (cpu_is_omap34xx()) |
243 | omap34xx_sram_init(); | |
244 | ||
245 | return 0; | |
246 | } |