1 /* 1
2 * Copyright (C) 2004 Florian Schirmer <jolt@
3 * Copyright (C) 2007 Aurelien Jarno <aurelie
4 * Copyright (C) 2010-2012 Hauke Mehrtens <ha
5 *
6 * This program is free software; you can red
7 * under the terms of the GNU General Publ
8 * Free Software Foundation; either version
9 * option) any later version.
10 *
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' A
12 * WARRANTIES, INCLUDING, BUT NOT LIMITED
13 * MERCHANTABILITY AND FITNESS FOR A PARTICUL
14 * NO EVENT SHALL THE AUTHOR BE LIABL
15 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQU
16 * NOT LIMITED TO, PROCUREMENT OF SUBSTITU
17 * USE, DATA, OR PROFITS; OR BUSINESS INTER
18 * ANY THEORY OF LIABILITY, WHETHER IN CONTR
19 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISIN
20 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSS
21 *
22 * You should have received a copy of the GN
23 * with this program; if not, write to the F
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/bmips.h>
36 #include <asm/bootinfo.h>
37 #include <bcm47xx.h>
38 #include <bcm47xx_board.h>
39 #include "bcm47xx_private.h"
40
41 static char bcm47xx_system_type[20] = "Broadco
42
43 const char *get_system_type(void)
44 {
45 return bcm47xx_system_type;
46 }
47
48 __init void bcm47xx_set_system_type(u16 chip_i
49 {
50 snprintf(bcm47xx_system_type, sizeof(b
51 (chip_id > 0x9999) ? "Broadco
52 "Broadco
53 chip_id);
54 }
55
56 static unsigned long lowmem __initdata;
57
58 static __init void prom_init_mem(void)
59 {
60 unsigned long mem;
61 unsigned long max;
62 unsigned long off;
63 struct cpuinfo_mips *c = ¤t_cpu_
64
65 /* Figure out memory size by finding a
66 *
67 * We should theoretically use the map
68 * However as the BCM47XX is mostly us
69 * want to reuse the memory used by CF
70 * functions stop to work at some poin
71 * call them at the beginning of the b
72 *
73 * BCM47XX uses 128MB for addressing t
74 * less than that amount of ram it rem
75 * available space.
76 */
77
78 /* Physical address, without mapping t
79 off = CPHYSADDR((unsigned long)prom_in
80
81 /* Accessing memory after 128 MiB will
82 max = 128 << 20;
83
84 for (mem = 1 << 20; mem < max; mem +=
85 /* Loop condition may be not e
86 if (off + mem >= max) {
87 mem = max;
88 pr_debug("Assume 128MB
89 break;
90 }
91 if (!memcmp((void *)prom_init,
92 break;
93 }
94 lowmem = mem;
95
96 /* Ignoring the last page when ddr siz
97 * accesses to last page is causing th
98 * using address above 128M stepping o
99 * space.
100 */
101 if (c->cputype == CPU_74K && (mem == (
102 mem -= 0x1000;
103 memblock_add(0, mem);
104 }
105
106 /*
107 * This is the first serial on the chip common
108 * for sb (ssb) and ai (bcma) bus.
109 */
110 #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + S
111
112 void __init prom_init(void)
113 {
114 /* Cache CBR addr before CPU/DMA setup
115 bmips_cbr_addr = BMIPS_GET_CBR();
116 prom_init_mem();
117 setup_8250_early_printk_port(CKSEG1ADD
118 }
119
120 #if defined(CONFIG_BCM47XX_BCMA) && defined(CO
121
122 #define EXTVBASE 0xc0000000
123 #define ENTRYLO(x) ((pte_val(pfn_pte((x)
124
125 #include <asm/tlbflush.h>
126
127 /* Stripped version of tlb_init, with the call
128 * dropped. Calling it at this stage causes a
129 */
130 static void early_tlb_init(void)
131 {
132 write_c0_pagemask(PM_DEFAULT_MASK);
133 write_c0_wired(0);
134 temp_tlb_entry = current_cpu_data.tlbs
135 local_flush_tlb_all();
136 }
137
138 void __init bcm47xx_prom_highmem_init(void)
139 {
140 unsigned long off = (unsigned long)pro
141 unsigned long extmem = 0;
142 bool highmem_region = false;
143
144 if (WARN_ON(bcm47xx_bus_type != BCM47X
145 return;
146
147 if (bcm47xx_bus.bcma.bus.chipinfo.id =
148 highmem_region = true;
149
150 if (lowmem != 128 << 20 || !highmem_re
151 return;
152
153 early_tlb_init();
154
155 /* Add one temporary TLB entry to map
156 * Physical Virtual
157 * 0x80000000 0xc0000000
158 * 0x90000000 0xd0000000
159 */
160 add_temporary_entry(ENTRYLO(0x80000000
161 ENTRYLO(0x80000000
162 EXTVBASE, PM_256M)
163
164 off = EXTVBASE + __pa(off);
165 for (extmem = 128 << 20; extmem < 512
166 if (!memcmp((void *)prom_init,
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
177 extmem >> 20);
178
179 /* TODO: Register extra memory */
180 }
181
182 #endif /* defined(CONFIG_BCM47XX_BCMA) && defi
183
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