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1c0c13eb AJ |
1 | /* |
2 | * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> | |
25e5fb97 | 3 | * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> |
c47cc20c | 4 | * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> |
1c0c13eb AJ |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2 of the License, or (at your | |
9 | * option) any later version. | |
10 | * | |
11 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
12 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
14 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
15 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
16 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
17 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
18 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
19 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
20 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
25 | */ | |
26 | ||
27 | #include <linux/init.h> | |
25e5fb97 AJ |
28 | #include <linux/types.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/spinlock.h> | |
e1ccbb65 HM |
31 | #include <linux/ssb/ssb_driver_chipcommon.h> |
32 | #include <linux/ssb/ssb_regs.h> | |
d3dce3d6 | 33 | #include <linux/smp.h> |
1c0c13eb | 34 | #include <asm/bootinfo.h> |
84e8bb5e HM |
35 | #include <bcm47xx.h> |
36 | #include <bcm47xx_board.h> | |
25e5fb97 | 37 | |
dd573285 | 38 | static char bcm47xx_system_type[20] = "Broadcom BCM47XX"; |
84e8bb5e | 39 | |
1c0c13eb AJ |
40 | const char *get_system_type(void) |
41 | { | |
dd573285 HM |
42 | return bcm47xx_system_type; |
43 | } | |
84e8bb5e | 44 | |
dd573285 HM |
45 | __init void bcm47xx_set_system_type(u16 chip_id) |
46 | { | |
47 | snprintf(bcm47xx_system_type, sizeof(bcm47xx_system_type), | |
48 | (chip_id > 0x9999) ? "Broadcom BCM%d" : | |
49 | "Broadcom BCM%04X", | |
50 | chip_id); | |
1c0c13eb AJ |
51 | } |
52 | ||
6ee1d934 RM |
53 | static unsigned long lowmem __initdata; |
54 | ||
25e5fb97 | 55 | static __init void prom_init_mem(void) |
1c0c13eb AJ |
56 | { |
57 | unsigned long mem; | |
aec92225 | 58 | unsigned long max; |
c47cc20c | 59 | unsigned long off; |
d3dce3d6 | 60 | struct cpuinfo_mips *c = ¤t_cpu_data; |
1c0c13eb | 61 | |
25e5fb97 AJ |
62 | /* Figure out memory size by finding aliases. |
63 | * | |
64 | * We should theoretically use the mapping from CFE using cfe_enummem(). | |
65 | * However as the BCM47XX is mostly used on low-memory systems, we | |
66 | * want to reuse the memory used by CFE (around 4MB). That means cfe_* | |
67 | * functions stop to work at some point during the boot, we should only | |
68 | * call them at the beginning of the boot. | |
aec92225 HM |
69 | * |
70 | * BCM47XX uses 128MB for addressing the ram, if the system contains | |
71 | * less that that amount of ram it remaps the ram more often into the | |
72 | * available space. | |
25e5fb97 | 73 | */ |
96a8123e RM |
74 | |
75 | /* Physical address, without mapping to any kernel segment */ | |
76 | off = CPHYSADDR((unsigned long)prom_init); | |
77 | ||
78 | /* Accessing memory after 128 MiB will cause an exception */ | |
79 | max = 128 << 20; | |
80 | ||
81 | for (mem = 1 << 20; mem < max; mem += 1 << 20) { | |
82 | /* Loop condition may be not enough, off may be over 1 MiB */ | |
83 | if (off + mem >= max) { | |
84 | mem = max; | |
d548ca6b | 85 | pr_debug("Assume 128MB RAM\n"); |
aec92225 HM |
86 | break; |
87 | } | |
c47cc20c | 88 | if (!memcmp(prom_init, prom_init + mem, 32)) |
1c0c13eb AJ |
89 | break; |
90 | } | |
6ee1d934 | 91 | lowmem = mem; |
1c0c13eb | 92 | |
d3dce3d6 HM |
93 | /* Ignoring the last page when ddr size is 128M. Cached |
94 | * accesses to last page is causing the processor to prefetch | |
95 | * using address above 128M stepping out of the ddr address | |
96 | * space. | |
97 | */ | |
98 | if (c->cputype == CPU_74K && (mem == (128 << 20))) | |
99 | mem -= 0x1000; | |
1c0c13eb AJ |
100 | add_memory_region(0, mem, BOOT_MEM_RAM); |
101 | } | |
102 | ||
e1ccbb65 HM |
103 | /* |
104 | * This is the first serial on the chip common core, it is at this position | |
105 | * for sb (ssb) and ai (bcma) bus. | |
106 | */ | |
107 | #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA) | |
108 | ||
25e5fb97 AJ |
109 | void __init prom_init(void) |
110 | { | |
25e5fb97 | 111 | prom_init_mem(); |
e1ccbb65 | 112 | setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0); |
25e5fb97 AJ |
113 | } |
114 | ||
1c0c13eb AJ |
115 | void __init prom_free_prom_memory(void) |
116 | { | |
117 | } | |
6ee1d934 RM |
118 | |
119 | #if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) | |
120 | ||
121 | #define EXTVBASE 0xc0000000 | |
122 | #define ENTRYLO(x) ((pte_val(pfn_pte((x) >> _PFN_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1) | |
123 | ||
124 | #include <asm/tlbflush.h> | |
125 | ||
126 | /* Stripped version of tlb_init, with the call to build_tlb_refill_handler | |
127 | * dropped. Calling it at this stage causes a hang. | |
128 | */ | |
b1f7e112 | 129 | void early_tlb_init(void) |
6ee1d934 RM |
130 | { |
131 | write_c0_pagemask(PM_DEFAULT_MASK); | |
132 | write_c0_wired(0); | |
133 | temp_tlb_entry = current_cpu_data.tlbsize - 1; | |
134 | local_flush_tlb_all(); | |
135 | } | |
136 | ||
137 | void __init bcm47xx_prom_highmem_init(void) | |
138 | { | |
139 | unsigned long off = (unsigned long)prom_init; | |
140 | unsigned long extmem = 0; | |
141 | bool highmem_region = false; | |
142 | ||
143 | if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA)) | |
144 | return; | |
145 | ||
146 | if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) | |
147 | highmem_region = true; | |
148 | ||
149 | if (lowmem != 128 << 20 || !highmem_region) | |
150 | return; | |
151 | ||
152 | early_tlb_init(); | |
153 | ||
154 | /* Add one temporary TLB entry to map SDRAM Region 2. | |
155 | * Physical Virtual | |
156 | * 0x80000000 0xc0000000 (1st: 256MB) | |
157 | * 0x90000000 0xd0000000 (2nd: 256MB) | |
158 | */ | |
159 | add_temporary_entry(ENTRYLO(0x80000000), | |
160 | ENTRYLO(0x80000000 + (256 << 20)), | |
161 | EXTVBASE, PM_256M); | |
162 | ||
163 | off = EXTVBASE + __pa(off); | |
164 | for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) { | |
165 | if (!memcmp(prom_init, (void *)(off + extmem), 16)) | |
166 | break; | |
167 | } | |
168 | extmem -= lowmem; | |
169 | ||
170 | early_tlb_init(); | |
171 | ||
172 | if (!extmem) | |
173 | return; | |
174 | ||
175 | pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n", | |
176 | extmem >> 20); | |
177 | ||
178 | /* TODO: Register extra memory */ | |
179 | } | |
180 | ||
181 | #endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */ |