Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu> |
| 4 | * |
| 5 | * Module name: oak.c |
| 6 | * |
| 7 | * Description: |
| 8 | * Architecture- / platform-specific boot-time initialization code for |
| 9 | * the IBM PowerPC 403GCX "Oak" evaluation board. Adapted from original |
| 10 | * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek |
| 11 | * <dan@net4x.com>. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/smp.h> |
| 18 | #include <linux/threads.h> |
| 19 | #include <linux/param.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/initrd.h> |
| 22 | #include <linux/irq.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | |
| 25 | #include <asm/board.h> |
| 26 | #include <asm/machdep.h> |
| 27 | #include <asm/page.h> |
| 28 | #include <asm/bootinfo.h> |
| 29 | #include <asm/ppc4xx_pic.h> |
| 30 | #include <asm/time.h> |
| 31 | |
| 32 | #include "oak.h" |
| 33 | |
| 34 | /* Function Prototypes */ |
| 35 | |
| 36 | extern void abort(void); |
| 37 | |
| 38 | /* Global Variables */ |
| 39 | |
| 40 | unsigned char __res[sizeof(bd_t)]; |
| 41 | |
| 42 | |
| 43 | /* |
| 44 | * void __init oak_init() |
| 45 | * |
| 46 | * Description: |
| 47 | * This routine... |
| 48 | * |
| 49 | * Input(s): |
| 50 | * r3 - Optional pointer to a board information structure. |
| 51 | * r4 - Optional pointer to the physical starting address of the init RAM |
| 52 | * disk. |
| 53 | * r5 - Optional pointer to the physical ending address of the init RAM |
| 54 | * disk. |
| 55 | * r6 - Optional pointer to the physical starting address of any kernel |
| 56 | * command-line parameters. |
| 57 | * r7 - Optional pointer to the physical ending address of any kernel |
| 58 | * command-line parameters. |
| 59 | * |
| 60 | * Output(s): |
| 61 | * N/A |
| 62 | * |
| 63 | * Returns: |
| 64 | * N/A |
| 65 | * |
| 66 | */ |
| 67 | void __init |
| 68 | platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
| 69 | unsigned long r6, unsigned long r7) |
| 70 | { |
| 71 | parse_bootinfo(find_bootinfo()); |
| 72 | |
| 73 | /* |
| 74 | * If we were passed in a board information, copy it into the |
| 75 | * residual data area. |
| 76 | */ |
| 77 | if (r3) { |
| 78 | memcpy((void *)__res, (void *)(r3 + KERNELBASE), sizeof(bd_t)); |
| 79 | } |
| 80 | |
| 81 | #if defined(CONFIG_BLK_DEV_INITRD) |
| 82 | /* |
| 83 | * If the init RAM disk has been configured in, and there's a valid |
| 84 | * starting address for it, set it up. |
| 85 | */ |
| 86 | if (r4) { |
| 87 | initrd_start = r4 + KERNELBASE; |
| 88 | initrd_end = r5 + KERNELBASE; |
| 89 | } |
| 90 | #endif /* CONFIG_BLK_DEV_INITRD */ |
| 91 | |
| 92 | /* Copy the kernel command line arguments to a safe place. */ |
| 93 | |
| 94 | if (r6) { |
| 95 | *(char *)(r7 + KERNELBASE) = 0; |
| 96 | strcpy(cmd_line, (char *)(r6 + KERNELBASE)); |
| 97 | } |
| 98 | |
| 99 | /* Initialize machine-dependency vectors */ |
| 100 | |
| 101 | ppc_md.setup_arch = oak_setup_arch; |
| 102 | ppc_md.show_percpuinfo = oak_show_percpuinfo; |
| 103 | ppc_md.irq_canonicalize = NULL; |
| 104 | ppc_md.init_IRQ = ppc4xx_pic_init; |
| 105 | ppc_md.get_irq = NULL; /* Set in ppc4xx_pic_init() */ |
| 106 | ppc_md.init = NULL; |
| 107 | |
| 108 | ppc_md.restart = oak_restart; |
| 109 | ppc_md.power_off = oak_power_off; |
| 110 | ppc_md.halt = oak_halt; |
| 111 | |
| 112 | ppc_md.time_init = oak_time_init; |
| 113 | ppc_md.set_rtc_time = oak_set_rtc_time; |
| 114 | ppc_md.get_rtc_time = oak_get_rtc_time; |
| 115 | ppc_md.calibrate_decr = oak_calibrate_decr; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Document me. |
| 120 | */ |
| 121 | void __init |
| 122 | oak_setup_arch(void) |
| 123 | { |
| 124 | /* XXX - Implement me */ |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * int oak_show_percpuinfo() |
| 129 | * |
| 130 | * Description: |
| 131 | * This routine pretty-prints the platform's internal CPU and bus clock |
| 132 | * frequencies into the buffer for usage in /proc/cpuinfo. |
| 133 | * |
| 134 | * Input(s): |
| 135 | * *buffer - Buffer into which CPU and bus clock frequencies are to be |
| 136 | * printed. |
| 137 | * |
| 138 | * Output(s): |
| 139 | * *buffer - Buffer with the CPU and bus clock frequencies. |
| 140 | * |
| 141 | * Returns: |
| 142 | * The number of bytes copied into 'buffer' if OK, otherwise zero or less |
| 143 | * on error. |
| 144 | */ |
| 145 | int |
| 146 | oak_show_percpuinfo(struct seq_file *m, int i) |
| 147 | { |
| 148 | bd_t *bp = (bd_t *)__res; |
| 149 | |
| 150 | seq_printf(m, "clock\t\t: %dMHz\n" |
| 151 | "bus clock\t\t: %dMHz\n", |
| 152 | bp->bi_intfreq / 1000000, |
| 153 | bp->bi_busfreq / 1000000); |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Document me. |
| 160 | */ |
| 161 | void |
| 162 | oak_restart(char *cmd) |
| 163 | { |
| 164 | abort(); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Document me. |
| 169 | */ |
| 170 | void |
| 171 | oak_power_off(void) |
| 172 | { |
| 173 | oak_restart(NULL); |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Document me. |
| 178 | */ |
| 179 | void |
| 180 | oak_halt(void) |
| 181 | { |
| 182 | oak_restart(NULL); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * Document me. |
| 187 | */ |
| 188 | long __init |
| 189 | oak_time_init(void) |
| 190 | { |
| 191 | /* XXX - Implement me */ |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Document me. |
| 197 | */ |
| 198 | int __init |
| 199 | oak_set_rtc_time(unsigned long time) |
| 200 | { |
| 201 | /* XXX - Implement me */ |
| 202 | |
| 203 | return (0); |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Document me. |
| 208 | */ |
| 209 | unsigned long __init |
| 210 | oak_get_rtc_time(void) |
| 211 | { |
| 212 | /* XXX - Implement me */ |
| 213 | |
| 214 | return (0); |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * void __init oak_calibrate_decr() |
| 219 | * |
| 220 | * Description: |
| 221 | * This routine retrieves the internal processor frequency from the board |
| 222 | * information structure, sets up the kernel timer decrementer based on |
| 223 | * that value, enables the 403 programmable interval timer (PIT) and sets |
| 224 | * it up for auto-reload. |
| 225 | * |
| 226 | * Input(s): |
| 227 | * N/A |
| 228 | * |
| 229 | * Output(s): |
| 230 | * N/A |
| 231 | * |
| 232 | * Returns: |
| 233 | * N/A |
| 234 | * |
| 235 | */ |
| 236 | void __init |
| 237 | oak_calibrate_decr(void) |
| 238 | { |
| 239 | unsigned int freq; |
| 240 | bd_t *bip = (bd_t *)__res; |
| 241 | |
| 242 | freq = bip->bi_intfreq; |
| 243 | |
| 244 | decrementer_count = freq / HZ; |
| 245 | count_period_num = 1; |
| 246 | count_period_den = freq; |
| 247 | |
| 248 | /* Enable the PIT and set auto-reload of its value */ |
| 249 | |
| 250 | mtspr(SPRN_TCR, TCR_PIE | TCR_ARE); |
| 251 | |
| 252 | /* Clear any pending timer interrupts */ |
| 253 | |
| 254 | mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS); |
| 255 | } |