1 | /* |
2 | * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> |
3 | * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> |
4 | * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> |
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> |
28 | #include <linux/types.h> |
29 | #include <linux/kernel.h> |
30 | #include <linux/memblock.h> |
31 | #include <linux/spinlock.h> |
32 | #include <linux/ssb/ssb_driver_chipcommon.h> |
33 | #include <linux/ssb/ssb_regs.h> |
34 | #include <linux/smp.h> |
35 | #include <asm/bootinfo.h> |
36 | #include <bcm47xx.h> |
37 | #include <bcm47xx_board.h> |
38 | |
39 | static char bcm47xx_system_type[20] = "Broadcom BCM47XX" ; |
40 | |
41 | const char *get_system_type(void) |
42 | { |
43 | return bcm47xx_system_type; |
44 | } |
45 | |
46 | __init void bcm47xx_set_system_type(u16 chip_id) |
47 | { |
48 | snprintf(buf: bcm47xx_system_type, size: sizeof(bcm47xx_system_type), |
49 | fmt: (chip_id > 0x9999) ? "Broadcom BCM%d" : |
50 | "Broadcom BCM%04X" , |
51 | chip_id); |
52 | } |
53 | |
54 | static unsigned long lowmem __initdata; |
55 | |
56 | static __init void prom_init_mem(void) |
57 | { |
58 | unsigned long mem; |
59 | unsigned long max; |
60 | unsigned long off; |
61 | struct cpuinfo_mips *c = ¤t_cpu_data; |
62 | |
63 | /* Figure out memory size by finding aliases. |
64 | * |
65 | * We should theoretically use the mapping from CFE using cfe_enummem(). |
66 | * However as the BCM47XX is mostly used on low-memory systems, we |
67 | * want to reuse the memory used by CFE (around 4MB). That means cfe_* |
68 | * functions stop to work at some point during the boot, we should only |
69 | * call them at the beginning of the boot. |
70 | * |
71 | * BCM47XX uses 128MB for addressing the ram, if the system contains |
72 | * less than that amount of ram it remaps the ram more often into the |
73 | * available space. |
74 | */ |
75 | |
76 | /* Physical address, without mapping to any kernel segment */ |
77 | off = CPHYSADDR((unsigned long)prom_init); |
78 | |
79 | /* Accessing memory after 128 MiB will cause an exception */ |
80 | max = 128 << 20; |
81 | |
82 | for (mem = 1 << 20; mem < max; mem += 1 << 20) { |
83 | /* Loop condition may be not enough, off may be over 1 MiB */ |
84 | if (off + mem >= max) { |
85 | mem = max; |
86 | pr_debug("Assume 128MB RAM\n" ); |
87 | break; |
88 | } |
89 | if (!memcmp((void *)prom_init, (void *)prom_init + mem, 32)) |
90 | break; |
91 | } |
92 | lowmem = mem; |
93 | |
94 | /* Ignoring the last page when ddr size is 128M. Cached |
95 | * accesses to last page is causing the processor to prefetch |
96 | * using address above 128M stepping out of the ddr address |
97 | * space. |
98 | */ |
99 | if (c->cputype == CPU_74K && (mem == (128 << 20))) |
100 | mem -= 0x1000; |
101 | memblock_add(base: 0, size: mem); |
102 | } |
103 | |
104 | /* |
105 | * This is the first serial on the chip common core, it is at this position |
106 | * for sb (ssb) and ai (bcma) bus. |
107 | */ |
108 | #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA) |
109 | |
110 | void __init prom_init(void) |
111 | { |
112 | prom_init_mem(); |
113 | setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0); |
114 | } |
115 | |
116 | #if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) |
117 | |
118 | #define EXTVBASE 0xc0000000 |
119 | #define ENTRYLO(x) ((pte_val(pfn_pte((x) >> PFN_PTE_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1) |
120 | |
121 | #include <asm/tlbflush.h> |
122 | |
123 | /* Stripped version of tlb_init, with the call to build_tlb_refill_handler |
124 | * dropped. Calling it at this stage causes a hang. |
125 | */ |
126 | void early_tlb_init(void) |
127 | { |
128 | write_c0_pagemask(PM_DEFAULT_MASK); |
129 | write_c0_wired(0); |
130 | temp_tlb_entry = current_cpu_data.tlbsize - 1; |
131 | local_flush_tlb_all(); |
132 | } |
133 | |
134 | void __init bcm47xx_prom_highmem_init(void) |
135 | { |
136 | unsigned long off = (unsigned long)prom_init; |
137 | unsigned long extmem = 0; |
138 | bool highmem_region = false; |
139 | |
140 | if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA)) |
141 | return; |
142 | |
143 | if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) |
144 | highmem_region = true; |
145 | |
146 | if (lowmem != 128 << 20 || !highmem_region) |
147 | return; |
148 | |
149 | early_tlb_init(); |
150 | |
151 | /* Add one temporary TLB entry to map SDRAM Region 2. |
152 | * Physical Virtual |
153 | * 0x80000000 0xc0000000 (1st: 256MB) |
154 | * 0x90000000 0xd0000000 (2nd: 256MB) |
155 | */ |
156 | add_temporary_entry(ENTRYLO(0x80000000), |
157 | ENTRYLO(0x80000000 + (256 << 20)), |
158 | EXTVBASE, PM_256M); |
159 | |
160 | off = EXTVBASE + __pa(off); |
161 | for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) { |
162 | if (!memcmp((void *)prom_init, (void *)(off + extmem), 16)) |
163 | break; |
164 | } |
165 | extmem -= lowmem; |
166 | |
167 | early_tlb_init(); |
168 | |
169 | if (!extmem) |
170 | return; |
171 | |
172 | pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n" , |
173 | extmem >> 20); |
174 | |
175 | /* TODO: Register extra memory */ |
176 | } |
177 | |
178 | #endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */ |
179 | |