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/smp.h> 32 #include <asm/bootinfo.h> 33 #include <asm/fw/cfe/cfe_api.h> 34 #include <asm/fw/cfe/cfe_error.h> 35 #include <bcm47xx.h> 36 #include <bcm47xx_board.h> 37 38 static int cfe_cons_handle; 39 40 static u16 get_chip_id(void) 41 { 42 switch (bcm47xx_bus_type) { 43 #ifdef CONFIG_BCM47XX_SSB 44 case BCM47XX_BUS_TYPE_SSB: 45 return bcm47xx_bus.ssb.chip_id; 46 #endif 47 #ifdef CONFIG_BCM47XX_BCMA 48 case BCM47XX_BUS_TYPE_BCMA: 49 return bcm47xx_bus.bcma.bus.chipinfo.id; 50 #endif 51 } 52 return 0; 53 } 54 55 const char *get_system_type(void) 56 { 57 static char buf[50]; 58 u16 chip_id = get_chip_id(); 59 60 snprintf(buf, sizeof(buf), 61 (chip_id > 0x9999) ? "Broadcom BCM%d (%s)" : 62 "Broadcom BCM%04X (%s)", 63 chip_id, bcm47xx_board_get_name()); 64 65 return buf; 66 } 67 68 void prom_putchar(char c) 69 { 70 while (cfe_write(cfe_cons_handle, &c, 1) == 0) 71 ; 72 } 73 74 static __init void prom_init_cfe(void) 75 { 76 uint32_t cfe_ept; 77 uint32_t cfe_handle; 78 uint32_t cfe_eptseal; 79 int argc = fw_arg0; 80 char **envp = (char **) fw_arg2; 81 int *prom_vec = (int *) fw_arg3; 82 83 /* 84 * Check if a loader was used; if NOT, the 4 arguments are 85 * what CFE gives us (handle, 0, EPT and EPTSEAL) 86 */ 87 if (argc < 0) { 88 cfe_handle = (uint32_t)argc; 89 cfe_ept = (uint32_t)envp; 90 cfe_eptseal = (uint32_t)prom_vec; 91 } else { 92 if ((int)prom_vec < 0) { 93 /* 94 * Old loader; all it gives us is the handle, 95 * so use the "known" entrypoint and assume 96 * the seal. 97 */ 98 cfe_handle = (uint32_t)prom_vec; 99 cfe_ept = 0xBFC00500; 100 cfe_eptseal = CFE_EPTSEAL; 101 } else { 102 /* 103 * Newer loaders bundle the handle/ept/eptseal 104 * Note: prom_vec is in the loader's useg 105 * which is still alive in the TLB. 106 */ 107 cfe_handle = prom_vec[0]; 108 cfe_ept = prom_vec[2]; 109 cfe_eptseal = prom_vec[3]; 110 } 111 } 112 113 if (cfe_eptseal != CFE_EPTSEAL) { 114 /* too early for panic to do any good */ 115 printk(KERN_ERR "CFE's entrypoint seal doesn't match."); 116 while (1) ; 117 } 118 119 cfe_init(cfe_handle, cfe_ept); 120 } 121 122 static __init void prom_init_console(void) 123 { 124 /* Initialize CFE console */ 125 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); 126 } 127 128 static __init void prom_init_cmdline(void) 129 { 130 static char buf[COMMAND_LINE_SIZE] __initdata; 131 132 /* Get the kernel command line from CFE */ 133 if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) { 134 buf[COMMAND_LINE_SIZE - 1] = 0; 135 strcpy(arcs_cmdline, buf); 136 } 137 138 /* Force a console handover by adding a console= argument if needed, 139 * as CFE is not available anymore later in the boot process. */ 140 if ((strstr(arcs_cmdline, "console=")) == NULL) { 141 /* Try to read the default serial port used by CFE */ 142 if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0) 143 || (strncmp("uart", buf, 4))) 144 /* Default to uart0 */ 145 strcpy(buf, "uart0"); 146 147 /* Compute the new command line */ 148 snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200", 149 arcs_cmdline, buf[4]); 150 } 151 } 152 153 static __init void prom_init_mem(void) 154 { 155 unsigned long mem; 156 unsigned long max; 157 unsigned long off; 158 struct cpuinfo_mips *c = ¤t_cpu_data; 159 160 /* Figure out memory size by finding aliases. 161 * 162 * We should theoretically use the mapping from CFE using cfe_enummem(). 163 * However as the BCM47XX is mostly used on low-memory systems, we 164 * want to reuse the memory used by CFE (around 4MB). That means cfe_* 165 * functions stop to work at some point during the boot, we should only 166 * call them at the beginning of the boot. 167 * 168 * BCM47XX uses 128MB for addressing the ram, if the system contains 169 * less that that amount of ram it remaps the ram more often into the 170 * available space. 171 * Accessing memory after 128MB will cause an exception. 172 * max contains the biggest possible address supported by the platform. 173 * If the method wants to try something above we assume 128MB ram. 174 */ 175 off = (unsigned long)prom_init; 176 max = off | ((128 << 20) - 1); 177 for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { 178 if ((off + mem) > max) { 179 mem = (128 << 20); 180 printk(KERN_DEBUG "assume 128MB RAM\n"); 181 break; 182 } 183 if (!memcmp(prom_init, prom_init + mem, 32)) 184 break; 185 } 186 187 /* Ignoring the last page when ddr size is 128M. Cached 188 * accesses to last page is causing the processor to prefetch 189 * using address above 128M stepping out of the ddr address 190 * space. 191 */ 192 if (c->cputype == CPU_74K && (mem == (128 << 20))) 193 mem -= 0x1000; 194 195 add_memory_region(0, mem, BOOT_MEM_RAM); 196 } 197 198 void __init prom_init(void) 199 { 200 prom_init_cfe(); 201 prom_init_console(); 202 prom_init_cmdline(); 203 prom_init_mem(); 204 } 205 206 void __init prom_free_prom_memory(void) 207 { 208 } 209