1/* 2 * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> 3 * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 * 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 13 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 14 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 15 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 16 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 17 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 18 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 19 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 20 * 21 * You should have received a copy of the GNU General Public License along 22 * with this program; if not, write to the Free Software Foundation, Inc., 23 * 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26#include <linux/init.h> 27#include <linux/types.h> 28#include <linux/kernel.h> 29#include <linux/spinlock.h> 30#include <asm/bootinfo.h> 31#include <asm/fw/cfe/cfe_api.h> 32#include <asm/fw/cfe/cfe_error.h> 33 34static int cfe_cons_handle; 35 36const char *get_system_type(void) 37{ 38 return "Broadcom BCM47XX"; 39} 40 41void prom_putchar(char c) 42{ 43 while (cfe_write(cfe_cons_handle, &c, 1) == 0) 44 ; 45} 46 47static __init void prom_init_cfe(void) 48{ 49 uint32_t cfe_ept; 50 uint32_t cfe_handle; 51 uint32_t cfe_eptseal; 52 int argc = fw_arg0; 53 char **envp = (char **) fw_arg2; 54 int *prom_vec = (int *) fw_arg3; 55 56 /* 57 * Check if a loader was used; if NOT, the 4 arguments are 58 * what CFE gives us (handle, 0, EPT and EPTSEAL) 59 */ 60 if (argc < 0) { 61 cfe_handle = (uint32_t)argc; 62 cfe_ept = (uint32_t)envp; 63 cfe_eptseal = (uint32_t)prom_vec; 64 } else { 65 if ((int)prom_vec < 0) { 66 /* 67 * Old loader; all it gives us is the handle, 68 * so use the "known" entrypoint and assume 69 * the seal. 70 */ 71 cfe_handle = (uint32_t)prom_vec; 72 cfe_ept = 0xBFC00500; 73 cfe_eptseal = CFE_EPTSEAL; 74 } else { 75 /* 76 * Newer loaders bundle the handle/ept/eptseal 77 * Note: prom_vec is in the loader's useg 78 * which is still alive in the TLB. 79 */ 80 cfe_handle = prom_vec[0]; 81 cfe_ept = prom_vec[2]; 82 cfe_eptseal = prom_vec[3]; 83 } 84 } 85 86 if (cfe_eptseal != CFE_EPTSEAL) { 87 /* too early for panic to do any good */ 88 printk(KERN_ERR "CFE's entrypoint seal doesn't match."); 89 while (1) ; 90 } 91 92 cfe_init(cfe_handle, cfe_ept); 93} 94 95static __init void prom_init_console(void) 96{ 97 /* Initialize CFE console */ 98 cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); 99} 100 101static __init void prom_init_cmdline(void) 102{ 103 static char buf[COMMAND_LINE_SIZE] __initdata; 104 105 /* Get the kernel command line from CFE */ 106 if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) { 107 buf[COMMAND_LINE_SIZE - 1] = 0; 108 strcpy(arcs_cmdline, buf); 109 } 110 111 /* Force a console handover by adding a console= argument if needed, 112 * as CFE is not available anymore later in the boot process. */ 113 if ((strstr(arcs_cmdline, "console=")) == NULL) { 114 /* Try to read the default serial port used by CFE */ 115 if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0) 116 || (strncmp("uart", buf, 4))) 117 /* Default to uart0 */ 118 strcpy(buf, "uart0"); 119 120 /* Compute the new command line */ 121 snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200", 122 arcs_cmdline, buf[4]); 123 } 124} 125 126static __init void prom_init_mem(void) 127{ 128 unsigned long mem; 129 unsigned long max; 130 131 /* Figure out memory size by finding aliases. 132 * 133 * We should theoretically use the mapping from CFE using cfe_enummem(). 134 * However as the BCM47XX is mostly used on low-memory systems, we 135 * want to reuse the memory used by CFE (around 4MB). That means cfe_* 136 * functions stop to work at some point during the boot, we should only 137 * call them at the beginning of the boot. 138 * 139 * BCM47XX uses 128MB for addressing the ram, if the system contains 140 * less that that amount of ram it remaps the ram more often into the 141 * available space. 142 * Accessing memory after 128MB will cause an exception. 143 * max contains the biggest possible address supported by the platform. 144 * If the method wants to try something above we assume 128MB ram. 145 */ 146 max = ((unsigned long)(prom_init) | ((128 << 20) - 1)); 147 for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { 148 if (((unsigned long)(prom_init) + mem) > max) { 149 mem = (128 << 20); 150 printk(KERN_DEBUG "assume 128MB RAM\n"); 151 break; 152 } 153 if (*(unsigned long *)((unsigned long)(prom_init) + mem) == 154 *(unsigned long *)(prom_init)) 155 break; 156 } 157 158 add_memory_region(0, mem, BOOT_MEM_RAM); 159} 160 161void __init prom_init(void) 162{ 163 prom_init_cfe(); 164 prom_init_console(); 165 prom_init_cmdline(); 166 prom_init_mem(); 167} 168 169void __init prom_free_prom_memory(void) 170{ 171} 172