1/* 2 * Copyright (C) 1995 Linus Torvalds 3 * Adapted from 'alpha' version by Gary Thomas 4 * Modified by Cort Dougan (cort@cs.nmt.edu) 5 * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net) 6 * Further modified for generic 8xx and 8260 by Dan. 7 */ 8 9#include <linux/sched.h> 10#include <linux/kernel.h> 11#include <linux/mm.h> 12#include <linux/stddef.h> 13#include <linux/slab.h> 14#include <linux/init.h> 15#include <linux/initrd.h> 16#include <linux/root_dev.h> 17#include <linux/seq_file.h> 18#include <linux/irq.h> 19 20#include <asm/mmu.h> 21#include <asm/io.h> 22#include <asm/pgtable.h> 23#include <asm/mpc8260.h> 24#include <asm/cpm2.h> 25#include <asm/machdep.h> 26#include <asm/bootinfo.h> 27#include <asm/time.h> 28 29#include "cpm2_pic.h" 30 31unsigned char __res[sizeof(bd_t)]; 32 33extern void pq2_find_bridges(void); 34extern void pq2pci_init_irq(void); 35extern void idma_pci9_init(void); 36 37/* Place-holder for board-specific init */ 38void __attribute__ ((weak)) __init 39m82xx_board_setup(void) 40{ 41} 42 43static void __init 44m8260_setup_arch(void) 45{ 46 /* Print out Vendor and Machine info. */ 47 printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE); 48 49 /* Reset the Communication Processor Module. */ 50 cpm2_reset(); 51#ifdef CONFIG_8260_PCI9 52 idma_pci9_init(); 53#endif 54#ifdef CONFIG_PCI_8260 55 pq2_find_bridges(); 56#endif 57#ifdef CONFIG_BLK_DEV_INITRD 58 if (initrd_start) 59 ROOT_DEV = Root_RAM0; 60#endif 61 62 identify_ppc_sys_by_name_and_id(BOARD_CHIP_NAME, 63 in_be32(CPM_MAP_ADDR + CPM_IMMR_OFFSET)); 64 65 m82xx_board_setup(); 66} 67 68/* The decrementer counts at the system (internal) clock frequency 69 * divided by four. 70 */ 71static void __init 72m8260_calibrate_decr(void) 73{ 74 bd_t *binfo = (bd_t *)__res; 75 int freq, divisor; 76 77 freq = binfo->bi_busfreq; 78 divisor = 4; 79 tb_ticks_per_jiffy = freq / HZ / divisor; 80 tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000); 81} 82 83/* The 8260 has an internal 1-second timer update register that 84 * we should use for this purpose. 85 */ 86static uint rtc_time; 87 88static int 89m8260_set_rtc_time(unsigned long time) 90{ 91 rtc_time = time; 92 93 return(0); 94} 95 96static unsigned long 97m8260_get_rtc_time(void) 98{ 99 /* Get time from the RTC. 100 */ 101 return((unsigned long)rtc_time); 102} 103 104#ifndef BOOTROM_RESTART_ADDR 105#warning "Using default BOOTROM_RESTART_ADDR!" 106#define BOOTROM_RESTART_ADDR 0xff000104 107#endif 108 109static void 110m8260_restart(char *cmd) 111{ 112 extern void m8260_gorom(bd_t *bi, uint addr); 113 uint startaddr; 114 115 /* Most boot roms have a warmstart as the second instruction 116 * of the reset vector. If that doesn't work for you, change this 117 * or the reboot program to send a proper address. 118 */ 119 startaddr = BOOTROM_RESTART_ADDR; 120 if (cmd != NULL) { 121 if (!strncmp(cmd, "startaddr=", 10)) 122 startaddr = simple_strtoul(&cmd[10], NULL, 0); 123 } 124 125 m8260_gorom((void*)__pa(__res), startaddr); 126} 127 128static void 129m8260_halt(void) 130{ 131 local_irq_disable(); 132 while (1); 133} 134 135static void 136m8260_power_off(void) 137{ 138 m8260_halt(); 139} 140 141static int 142m8260_show_cpuinfo(struct seq_file *m) 143{ 144 bd_t *bp = (bd_t *)__res; 145 146 seq_printf(m, "vendor\t\t: %s\n" 147 "machine\t\t: %s\n" 148 "\n" 149 "mem size\t\t: 0x%08x\n" 150 "console baud\t\t: %d\n" 151 "\n" 152 "core clock\t: %u MHz\n" 153 "CPM clock\t: %u MHz\n" 154 "bus clock\t: %u MHz\n", 155 CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize, 156 bp->bi_baudrate, bp->bi_intfreq / 1000000, 157 bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000); 158 return 0; 159} 160 161/* Initialize the internal interrupt controller. The number of 162 * interrupts supported can vary with the processor type, and the 163 * 8260 family can have up to 64. 164 * External interrupts can be either edge or level triggered, and 165 * need to be initialized by the appropriate driver. 166 */ 167static void __init 168m8260_init_IRQ(void) 169{ 170 cpm2_init_IRQ(); 171 172 /* Initialize the default interrupt mapping priorities, 173 * in case the boot rom changed something on us. 174 */ 175 cpm2_immr->im_intctl.ic_siprr = 0x05309770; 176 177#if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS)) 178 /* Initialize stuff for the 82xx CPLD IC and install demux */ 179 pq2pci_init_irq(); 180#endif 181 182} 183 184/* 185 * Same hack as 8xx 186 */ 187static unsigned long __init 188m8260_find_end_of_memory(void) 189{ 190 bd_t *binfo = (bd_t *)__res; 191 192 return binfo->bi_memsize; 193} 194 195/* Map the IMMR, plus anything else we can cover 196 * in that upper space according to the memory controller 197 * chip select mapping. Grab another bunch of space 198 * below that for stuff we can't cover in the upper. 199 */ 200static void __init 201m8260_map_io(void) 202{ 203 uint addr; 204 205 /* Map IMMR region to a 256MB BAT */ 206 addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR; 207 io_block_mapping(addr, addr, 0x10000000, _PAGE_IO); 208 209 /* Map I/O region to a 256MB BAT */ 210 io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO); 211} 212 213/* Place-holder for board-specific ppc_md hooking */ 214void __attribute__ ((weak)) __init 215m82xx_board_init(void) 216{ 217} 218 219/* Inputs: 220 * r3 - Optional pointer to a board information structure. 221 * r4 - Optional pointer to the physical starting address of the init RAM 222 * disk. 223 * r5 - Optional pointer to the physical ending address of the init RAM 224 * disk. 225 * r6 - Optional pointer to the physical starting address of any kernel 226 * command-line parameters. 227 * r7 - Optional pointer to the physical ending address of any kernel 228 * command-line parameters. 229 */ 230void __init 231platform_init(unsigned long r3, unsigned long r4, unsigned long r5, 232 unsigned long r6, unsigned long r7) 233{ 234 parse_bootinfo(find_bootinfo()); 235 236 if ( r3 ) 237 memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) ); 238 239#ifdef CONFIG_BLK_DEV_INITRD 240 /* take care of initrd if we have one */ 241 if ( r4 ) { 242 initrd_start = r4 + KERNELBASE; 243 initrd_end = r5 + KERNELBASE; 244 } 245#endif /* CONFIG_BLK_DEV_INITRD */ 246 /* take care of cmd line */ 247 if ( r6 ) { 248 *(char *)(r7+KERNELBASE) = 0; 249 strcpy(cmd_line, (char *)(r6+KERNELBASE)); 250 } 251 252 ppc_md.setup_arch = m8260_setup_arch; 253 ppc_md.show_cpuinfo = m8260_show_cpuinfo; 254 ppc_md.init_IRQ = m8260_init_IRQ; 255 ppc_md.get_irq = cpm2_get_irq; 256 257 ppc_md.restart = m8260_restart; 258 ppc_md.power_off = m8260_power_off; 259 ppc_md.halt = m8260_halt; 260 261 ppc_md.set_rtc_time = m8260_set_rtc_time; 262 ppc_md.get_rtc_time = m8260_get_rtc_time; 263 ppc_md.calibrate_decr = m8260_calibrate_decr; 264 265 ppc_md.find_end_of_memory = m8260_find_end_of_memory; 266 ppc_md.setup_io_mappings = m8260_map_io; 267 268 /* Call back for board-specific settings and overrides. */ 269 m82xx_board_init(); 270} 271