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