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/spinlock.h> 31 #include <linux/ssb/ssb_driver_chipcommon.h> 32 #include <linux/ssb/ssb_regs.h> 33 #include <linux/smp.h> 34 #include <asm/bootinfo.h> 35 #include <bcm47xx.h> 36 #include <bcm47xx_board.h> 37 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(bcm47xx_system_type, sizeof(bcm47xx_system_type), 49 (chip_id > 0x9999) ? "Broadcom BCM%d" : 50 "Broadcom BCM%04X", 51 chip_id); 52 } 53 54 static __init void prom_init_mem(void) 55 { 56 unsigned long mem; 57 unsigned long max; 58 unsigned long off; 59 struct cpuinfo_mips *c = ¤t_cpu_data; 60 61 /* Figure out memory size by finding aliases. 62 * 63 * We should theoretically use the mapping from CFE using cfe_enummem(). 64 * However as the BCM47XX is mostly used on low-memory systems, we 65 * want to reuse the memory used by CFE (around 4MB). That means cfe_* 66 * functions stop to work at some point during the boot, we should only 67 * call them at the beginning of the boot. 68 * 69 * BCM47XX uses 128MB for addressing the ram, if the system contains 70 * less that that amount of ram it remaps the ram more often into the 71 * available space. 72 * Accessing memory after 128MB will cause an exception. 73 * max contains the biggest possible address supported by the platform. 74 * If the method wants to try something above we assume 128MB ram. 75 */ 76 off = (unsigned long)prom_init; 77 max = off | ((128 << 20) - 1); 78 for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { 79 if ((off + mem) > max) { 80 mem = (128 << 20); 81 printk(KERN_DEBUG "assume 128MB RAM\n"); 82 break; 83 } 84 if (!memcmp(prom_init, prom_init + mem, 32)) 85 break; 86 } 87 88 /* Ignoring the last page when ddr size is 128M. Cached 89 * accesses to last page is causing the processor to prefetch 90 * using address above 128M stepping out of the ddr address 91 * space. 92 */ 93 if (c->cputype == CPU_74K && (mem == (128 << 20))) 94 mem -= 0x1000; 95 96 add_memory_region(0, mem, BOOT_MEM_RAM); 97 } 98 99 /* 100 * This is the first serial on the chip common core, it is at this position 101 * for sb (ssb) and ai (bcma) bus. 102 */ 103 #define BCM47XX_SERIAL_ADDR (SSB_ENUM_BASE + SSB_CHIPCO_UART0_DATA) 104 105 void __init prom_init(void) 106 { 107 prom_init_mem(); 108 setup_8250_early_printk_port(CKSEG1ADDR(BCM47XX_SERIAL_ADDR), 0, 0); 109 } 110 111 void __init prom_free_prom_memory(void) 112 { 113 } 114