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e7300d04 MB |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> | |
7 | * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org> | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/cpu.h> | |
602977b0 | 13 | #include <asm/cpu.h> |
2b5b9b78 | 14 | #include <asm/cpu-info.h> |
602977b0 | 15 | #include <asm/mipsregs.h> |
e7300d04 MB |
16 | #include <bcm63xx_cpu.h> |
17 | #include <bcm63xx_regs.h> | |
18 | #include <bcm63xx_io.h> | |
19 | #include <bcm63xx_irq.h> | |
20 | ||
21 | const unsigned long *bcm63xx_regs_base; | |
22 | EXPORT_SYMBOL(bcm63xx_regs_base); | |
23 | ||
24 | const int *bcm63xx_irqs; | |
25 | EXPORT_SYMBOL(bcm63xx_irqs); | |
26 | ||
27 | static u16 bcm63xx_cpu_id; | |
28 | static u16 bcm63xx_cpu_rev; | |
29 | static unsigned int bcm63xx_cpu_freq; | |
30 | static unsigned int bcm63xx_memory_size; | |
31 | ||
ec68c520 MB |
32 | static const unsigned long bcm6338_regs_base[] = { |
33 | __GEN_CPU_REGS_TABLE(6338) | |
e7300d04 MB |
34 | }; |
35 | ||
ec68c520 MB |
36 | static const int bcm6338_irqs[] = { |
37 | __GEN_CPU_IRQ_TABLE(6338) | |
e7300d04 MB |
38 | }; |
39 | ||
ec68c520 MB |
40 | static const unsigned long bcm6345_regs_base[] = { |
41 | __GEN_CPU_REGS_TABLE(6345) | |
e7300d04 MB |
42 | }; |
43 | ||
ec68c520 MB |
44 | static const int bcm6345_irqs[] = { |
45 | __GEN_CPU_IRQ_TABLE(6345) | |
e7300d04 MB |
46 | }; |
47 | ||
ec68c520 MB |
48 | static const unsigned long bcm6348_regs_base[] = { |
49 | __GEN_CPU_REGS_TABLE(6348) | |
e7300d04 MB |
50 | }; |
51 | ||
ec68c520 MB |
52 | static const int bcm6348_irqs[] = { |
53 | __GEN_CPU_IRQ_TABLE(6348) | |
54 | ||
e7300d04 MB |
55 | }; |
56 | ||
ec68c520 MB |
57 | static const unsigned long bcm6358_regs_base[] = { |
58 | __GEN_CPU_REGS_TABLE(6358) | |
e7300d04 MB |
59 | }; |
60 | ||
ec68c520 MB |
61 | static const int bcm6358_irqs[] = { |
62 | __GEN_CPU_IRQ_TABLE(6358) | |
63 | ||
e7300d04 MB |
64 | }; |
65 | ||
04712f3f MB |
66 | static const unsigned long bcm6368_regs_base[] = { |
67 | __GEN_CPU_REGS_TABLE(6368) | |
68 | }; | |
69 | ||
70 | static const int bcm6368_irqs[] = { | |
71 | __GEN_CPU_IRQ_TABLE(6368) | |
72 | ||
73 | }; | |
74 | ||
e7300d04 MB |
75 | u16 __bcm63xx_get_cpu_id(void) |
76 | { | |
77 | return bcm63xx_cpu_id; | |
78 | } | |
79 | ||
80 | EXPORT_SYMBOL(__bcm63xx_get_cpu_id); | |
81 | ||
82 | u16 bcm63xx_get_cpu_rev(void) | |
83 | { | |
84 | return bcm63xx_cpu_rev; | |
85 | } | |
86 | ||
87 | EXPORT_SYMBOL(bcm63xx_get_cpu_rev); | |
88 | ||
89 | unsigned int bcm63xx_get_cpu_freq(void) | |
90 | { | |
91 | return bcm63xx_cpu_freq; | |
92 | } | |
93 | ||
94 | unsigned int bcm63xx_get_memory_size(void) | |
95 | { | |
96 | return bcm63xx_memory_size; | |
97 | } | |
98 | ||
99 | static unsigned int detect_cpu_clock(void) | |
100 | { | |
04712f3f MB |
101 | switch (bcm63xx_get_cpu_id()) { |
102 | case BCM6338_CPU_ID: | |
103 | /* BCM6338 has a fixed 240 Mhz frequency */ | |
e7300d04 MB |
104 | return 240000000; |
105 | ||
04712f3f MB |
106 | case BCM6345_CPU_ID: |
107 | /* BCM6345 has a fixed 140Mhz frequency */ | |
e7300d04 MB |
108 | return 140000000; |
109 | ||
04712f3f MB |
110 | case BCM6348_CPU_ID: |
111 | { | |
112 | unsigned int tmp, n1, n2, m1; | |
113 | ||
e7300d04 MB |
114 | /* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */ |
115 | tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG); | |
116 | n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT; | |
117 | n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT; | |
118 | m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT; | |
119 | n1 += 1; | |
120 | n2 += 2; | |
121 | m1 += 1; | |
04712f3f | 122 | return (16 * 1000000 * n1 * n2) / m1; |
e7300d04 MB |
123 | } |
124 | ||
04712f3f MB |
125 | case BCM6358_CPU_ID: |
126 | { | |
127 | unsigned int tmp, n1, n2, m1; | |
128 | ||
e7300d04 MB |
129 | /* 16MHz * N1 * N2 / M1_CPU */ |
130 | tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG); | |
131 | n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT; | |
132 | n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT; | |
133 | m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT; | |
04712f3f | 134 | return (16 * 1000000 * n1 * n2) / m1; |
e7300d04 MB |
135 | } |
136 | ||
04712f3f MB |
137 | case BCM6368_CPU_ID: |
138 | { | |
139 | unsigned int tmp, p1, p2, ndiv, m1; | |
140 | ||
141 | /* (64MHz / P1) * P2 * NDIV / M1_CPU */ | |
142 | tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_6368_REG); | |
143 | ||
144 | p1 = (tmp & DMIPSPLLCFG_6368_P1_MASK) >> | |
145 | DMIPSPLLCFG_6368_P1_SHIFT; | |
146 | ||
147 | p2 = (tmp & DMIPSPLLCFG_6368_P2_MASK) >> | |
148 | DMIPSPLLCFG_6368_P2_SHIFT; | |
149 | ||
150 | ndiv = (tmp & DMIPSPLLCFG_6368_NDIV_MASK) >> | |
151 | DMIPSPLLCFG_6368_NDIV_SHIFT; | |
152 | ||
153 | tmp = bcm_ddr_readl(DDR_DMIPSPLLDIV_6368_REG); | |
154 | m1 = (tmp & DMIPSPLLDIV_6368_MDIV_MASK) >> | |
155 | DMIPSPLLDIV_6368_MDIV_SHIFT; | |
156 | ||
157 | return (((64 * 1000000) / p1) * p2 * ndiv) / m1; | |
158 | } | |
159 | ||
160 | default: | |
161 | BUG(); | |
162 | } | |
e7300d04 MB |
163 | } |
164 | ||
165 | /* | |
166 | * attempt to detect the amount of memory installed | |
167 | */ | |
168 | static unsigned int detect_memory_size(void) | |
169 | { | |
170 | unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0; | |
171 | u32 val; | |
172 | ||
d61fcfe2 FF |
173 | if (BCMCPU_IS_6345()) { |
174 | val = bcm_sdram_readl(SDRAM_MBASE_REG); | |
175 | return (val * 8 * 1024 * 1024); | |
176 | } | |
e7300d04 MB |
177 | |
178 | if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) { | |
179 | val = bcm_sdram_readl(SDRAM_CFG_REG); | |
180 | rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT; | |
181 | cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT; | |
182 | is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0; | |
183 | banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1; | |
184 | } | |
185 | ||
04712f3f | 186 | if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) { |
e7300d04 MB |
187 | val = bcm_memc_readl(MEMC_CFG_REG); |
188 | rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT; | |
189 | cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT; | |
190 | is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1; | |
191 | banks = 2; | |
192 | } | |
193 | ||
194 | /* 0 => 11 address bits ... 2 => 13 address bits */ | |
195 | rows += 11; | |
196 | ||
197 | /* 0 => 8 address bits ... 2 => 10 address bits */ | |
198 | cols += 8; | |
199 | ||
200 | return 1 << (cols + rows + (is_32bits + 1) + banks); | |
201 | } | |
202 | ||
203 | void __init bcm63xx_cpu_init(void) | |
204 | { | |
205 | unsigned int tmp, expected_cpu_id; | |
206 | struct cpuinfo_mips *c = ¤t_cpu_data; | |
2b5b9b78 | 207 | unsigned int cpu = smp_processor_id(); |
e7300d04 MB |
208 | |
209 | /* soc registers location depends on cpu type */ | |
210 | expected_cpu_id = 0; | |
211 | ||
212 | switch (c->cputype) { | |
602977b0 KC |
213 | case CPU_BMIPS3300: |
214 | if ((read_c0_prid() & 0xff00) == PRID_IMP_BMIPS3300_ALT) { | |
215 | expected_cpu_id = BCM6348_CPU_ID; | |
ec68c520 MB |
216 | bcm63xx_regs_base = bcm6348_regs_base; |
217 | bcm63xx_irqs = bcm6348_irqs; | |
602977b0 KC |
218 | } else { |
219 | __cpu_name[cpu] = "Broadcom BCM6338"; | |
220 | expected_cpu_id = BCM6338_CPU_ID; | |
ec68c520 MB |
221 | bcm63xx_regs_base = bcm6338_regs_base; |
222 | bcm63xx_irqs = bcm6338_irqs; | |
602977b0 | 223 | } |
e7300d04 | 224 | break; |
602977b0 | 225 | case CPU_BMIPS32: |
e7300d04 | 226 | expected_cpu_id = BCM6345_CPU_ID; |
ec68c520 MB |
227 | bcm63xx_regs_base = bcm6345_regs_base; |
228 | bcm63xx_irqs = bcm6345_irqs; | |
e7300d04 | 229 | break; |
602977b0 | 230 | case CPU_BMIPS4350: |
04712f3f MB |
231 | switch (read_c0_prid() & 0xf0) { |
232 | case 0x10: | |
233 | expected_cpu_id = BCM6358_CPU_ID; | |
234 | bcm63xx_regs_base = bcm6358_regs_base; | |
235 | bcm63xx_irqs = bcm6358_irqs; | |
236 | break; | |
237 | case 0x30: | |
238 | expected_cpu_id = BCM6368_CPU_ID; | |
239 | bcm63xx_regs_base = bcm6368_regs_base; | |
240 | bcm63xx_irqs = bcm6368_irqs; | |
241 | break; | |
242 | } | |
e7300d04 MB |
243 | break; |
244 | } | |
245 | ||
246 | /* | |
247 | * really early to panic, but delaying panic would not help since we | |
248 | * will never get any working console | |
249 | */ | |
250 | if (!expected_cpu_id) | |
251 | panic("unsupported Broadcom CPU"); | |
252 | ||
253 | /* | |
254 | * bcm63xx_regs_base is set, we can access soc registers | |
255 | */ | |
256 | ||
257 | /* double check CPU type */ | |
258 | tmp = bcm_perf_readl(PERF_REV_REG); | |
259 | bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT; | |
260 | bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT; | |
261 | ||
262 | if (bcm63xx_cpu_id != expected_cpu_id) | |
263 | panic("bcm63xx CPU id mismatch"); | |
264 | ||
265 | bcm63xx_cpu_freq = detect_cpu_clock(); | |
266 | bcm63xx_memory_size = detect_memory_size(); | |
267 | ||
268 | printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n", | |
269 | bcm63xx_cpu_id, bcm63xx_cpu_rev); | |
270 | printk(KERN_INFO "CPU frequency is %u MHz\n", | |
271 | bcm63xx_cpu_freq / 1000000); | |
272 | printk(KERN_INFO "%uMB of RAM installed\n", | |
273 | bcm63xx_memory_size >> 20); | |
274 | } |