Commit | Line | Data |
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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> | |
e7ae8d17 | 30 | #include <linux/memblock.h> |
25e5fb97 | 31 | #include <linux/spinlock.h> |
e1ccbb65 HM |
32 | #include <linux/ssb/ssb_driver_chipcommon.h> |
33 | #include <linux/ssb/ssb_regs.h> | |
d3dce3d6 | 34 | #include <linux/smp.h> |
a5c05453 | 35 | #include <asm/bmips.h> |
1c0c13eb | 36 | #include <asm/bootinfo.h> |
84e8bb5e HM |
37 | #include <bcm47xx.h> |
38 | #include <bcm47xx_board.h> | |
34059321 | 39 | #include "bcm47xx_private.h" |
25e5fb97 | 40 | |
dd573285 | 41 | static char bcm47xx_system_type[20] = "Broadcom BCM47XX"; |
84e8bb5e | 42 | |
1c0c13eb AJ |
43 | const char *get_system_type(void) |
44 | { | |
dd573285 HM |
45 | return bcm47xx_system_type; |
46 | } | |
84e8bb5e | 47 | |
dd573285 HM |
48 | __init void bcm47xx_set_system_type(u16 chip_id) |
49 | { | |
50 | snprintf(bcm47xx_system_type, sizeof(bcm47xx_system_type), | |
51 | (chip_id > 0x9999) ? "Broadcom BCM%d" : | |
52 | "Broadcom BCM%04X", | |
53 | chip_id); | |
1c0c13eb AJ |
54 | } |
55 | ||
6ee1d934 RM |
56 | static unsigned long lowmem __initdata; |
57 | ||
25e5fb97 | 58 | static __init void prom_init_mem(void) |
1c0c13eb AJ |
59 | { |
60 | unsigned long mem; | |
aec92225 | 61 | unsigned long max; |
c47cc20c | 62 | unsigned long off; |
d3dce3d6 | 63 | struct cpuinfo_mips *c = ¤t_cpu_data; |
1c0c13eb | 64 | |
25e5fb97 AJ |
65 | /* Figure out memory size by finding aliases. |
66 | * | |
67 | * We should theoretically use the mapping from CFE using cfe_enummem(). | |
68 | * However as the BCM47XX is mostly used on low-memory systems, we | |
69 | * want to reuse the memory used by CFE (around 4MB). That means cfe_* | |
70 | * functions stop to work at some point during the boot, we should only | |
71 | * call them at the beginning of the boot. | |
aec92225 HM |
72 | * |
73 | * BCM47XX uses 128MB for addressing the ram, if the system contains | |
b8295e44 | 74 | * less than that amount of ram it remaps the ram more often into the |
aec92225 | 75 | * available space. |
25e5fb97 | 76 | */ |
96a8123e RM |
77 | |
78 | /* Physical address, without mapping to any kernel segment */ | |
79 | off = CPHYSADDR((unsigned long)prom_init); | |
80 | ||
81 | /* Accessing memory after 128 MiB will cause an exception */ | |
82 | max = 128 << 20; | |
83 | ||
84 | for (mem = 1 << 20; mem < max; mem += 1 << 20) { | |
85 | /* Loop condition may be not enough, off may be over 1 MiB */ | |
86 | if (off + mem >= max) { | |
87 | mem = max; | |
d548ca6b | 88 | pr_debug("Assume 128MB RAM\n"); |
aec92225 HM |
89 | break; |
90 | } | |
0dedcf6e | 91 | if (!memcmp((void *)prom_init, (void *)prom_init + mem, 32)) |
1c0c13eb AJ |
92 | break; |
93 | } | |
6ee1d934 | 94 | lowmem = mem; |
1c0c13eb | 95 | |
d3dce3d6 HM |
96 | /* Ignoring the last page when ddr size is 128M. Cached |
97 | * accesses to last page is causing the processor to prefetch | |
98 | * using address above 128M stepping out of the ddr address | |
99 | * space. | |
100 | */ | |
101 | if (c->cputype == CPU_74K && (mem == (128 << 20))) | |
102 | mem -= 0x1000; | |
e7ae8d17 | 103 | memblock_add(0, mem); |
1c0c13eb AJ |
104 | } |
105 | ||
e1ccbb65 HM |
106 | /* |
107 | * This is the first serial on the chip common core, it is at this position | |
108 | * for sb (ssb) and ai (bcma) bus. | |
109 | */ | |
110 | #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA) | |
111 | ||
25e5fb97 AJ |
112 | void __init prom_init(void) |
113 | { | |
a5c05453 CM |
114 | /* Cache CBR addr before CPU/DMA setup */ |
115 | bmips_cbr_addr = BMIPS_GET_CBR(); | |
25e5fb97 | 116 | prom_init_mem(); |
e1ccbb65 | 117 | setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0); |
25e5fb97 AJ |
118 | } |
119 | ||
6ee1d934 RM |
120 | #if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) |
121 | ||
122 | #define EXTVBASE 0xc0000000 | |
15fa3e8e | 123 | #define ENTRYLO(x) ((pte_val(pfn_pte((x) >> PFN_PTE_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1) |
6ee1d934 RM |
124 | |
125 | #include <asm/tlbflush.h> | |
126 | ||
127 | /* Stripped version of tlb_init, with the call to build_tlb_refill_handler | |
128 | * dropped. Calling it at this stage causes a hang. | |
129 | */ | |
d18419cd | 130 | static void early_tlb_init(void) |
6ee1d934 RM |
131 | { |
132 | write_c0_pagemask(PM_DEFAULT_MASK); | |
133 | write_c0_wired(0); | |
134 | temp_tlb_entry = current_cpu_data.tlbsize - 1; | |
135 | local_flush_tlb_all(); | |
136 | } | |
137 | ||
138 | void __init bcm47xx_prom_highmem_init(void) | |
139 | { | |
140 | unsigned long off = (unsigned long)prom_init; | |
141 | unsigned long extmem = 0; | |
142 | bool highmem_region = false; | |
143 | ||
144 | if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA)) | |
145 | return; | |
146 | ||
147 | if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) | |
148 | highmem_region = true; | |
149 | ||
150 | if (lowmem != 128 << 20 || !highmem_region) | |
151 | return; | |
152 | ||
153 | early_tlb_init(); | |
154 | ||
155 | /* Add one temporary TLB entry to map SDRAM Region 2. | |
156 | * Physical Virtual | |
157 | * 0x80000000 0xc0000000 (1st: 256MB) | |
158 | * 0x90000000 0xd0000000 (2nd: 256MB) | |
159 | */ | |
160 | add_temporary_entry(ENTRYLO(0x80000000), | |
161 | ENTRYLO(0x80000000 + (256 << 20)), | |
162 | EXTVBASE, PM_256M); | |
163 | ||
164 | off = EXTVBASE + __pa(off); | |
165 | for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) { | |
0dedcf6e | 166 | if (!memcmp((void *)prom_init, (void *)(off + extmem), 16)) |
6ee1d934 RM |
167 | break; |
168 | } | |
169 | extmem -= lowmem; | |
170 | ||
171 | early_tlb_init(); | |
172 | ||
173 | if (!extmem) | |
174 | return; | |
175 | ||
176 | pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n", | |
177 | extmem >> 20); | |
178 | ||
179 | /* TODO: Register extra memory */ | |
180 | } | |
181 | ||
182 | #endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */ |