Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org> |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 3 | * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net> |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 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> |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 27 | #include <linux/types.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/spinlock.h> |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 30 | #include <asm/bootinfo.h> |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 31 | #include <asm/fw/cfe/cfe_api.h> |
| 32 | #include <asm/fw/cfe/cfe_error.h> |
| 33 | |
| 34 | static int cfe_cons_handle; |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 35 | |
| 36 | const char *get_system_type(void) |
| 37 | { |
| 38 | return "Broadcom BCM47XX"; |
| 39 | } |
| 40 | |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 41 | void prom_putchar(char c) |
| 42 | { |
| 43 | while (cfe_write(cfe_cons_handle, &c, 1) == 0) |
| 44 | ; |
| 45 | } |
| 46 | |
| 47 | static __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 | |
| 95 | static __init void prom_init_console(void) |
| 96 | { |
| 97 | /* Initialize CFE console */ |
| 98 | cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); |
| 99 | } |
| 100 | |
| 101 | static __init void prom_init_cmdline(void) |
| 102 | { |
Atsushi Nemoto | c4304529 | 2009-11-08 02:20:37 +0900 | [diff] [blame] | 103 | static char buf[CL_SIZE] __initdata; |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 104 | |
| 105 | /* Get the kernel command line from CFE */ |
| 106 | if (cfe_getenv("LINUX_CMDLINE", buf, CL_SIZE) >= 0) { |
| 107 | buf[CL_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, CL_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, CL_SIZE, "%s console=ttyS%c,115200", |
| 122 | arcs_cmdline, buf[4]); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static __init void prom_init_mem(void) |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 127 | { |
| 128 | unsigned long mem; |
| 129 | |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 130 | /* Figure out memory size by finding aliases. |
| 131 | * |
| 132 | * We should theoretically use the mapping from CFE using cfe_enummem(). |
| 133 | * However as the BCM47XX is mostly used on low-memory systems, we |
| 134 | * want to reuse the memory used by CFE (around 4MB). That means cfe_* |
| 135 | * functions stop to work at some point during the boot, we should only |
| 136 | * call them at the beginning of the boot. |
| 137 | */ |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 138 | for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) { |
| 139 | if (*(unsigned long *)((unsigned long)(prom_init) + mem) == |
| 140 | *(unsigned long *)(prom_init)) |
| 141 | break; |
| 142 | } |
| 143 | |
| 144 | add_memory_region(0, mem, BOOT_MEM_RAM); |
| 145 | } |
| 146 | |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 147 | void __init prom_init(void) |
| 148 | { |
| 149 | prom_init_cfe(); |
| 150 | prom_init_console(); |
| 151 | prom_init_cmdline(); |
| 152 | prom_init_mem(); |
| 153 | } |
| 154 | |
Aurelien Jarno | 1c0c13e | 2007-09-25 15:40:12 +0200 | [diff] [blame] | 155 | void __init prom_free_prom_memory(void) |
| 156 | { |
| 157 | } |
Aurelien Jarno | 25e5fb9 | 2007-09-25 15:41:24 +0200 | [diff] [blame] | 158 | |