diff options
Diffstat (limited to 'arch/ppc/syslib/m8260_setup.c')
| -rw-r--r-- | arch/ppc/syslib/m8260_setup.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/arch/ppc/syslib/m8260_setup.c b/arch/ppc/syslib/m8260_setup.c new file mode 100644 index 000000000000..23ea3f694de2 --- /dev/null +++ b/arch/ppc/syslib/m8260_setup.c @@ -0,0 +1,264 @@ +/* + * arch/ppc/syslib/m8260_setup.c + * + * Copyright (C) 1995 Linus Torvalds + * Adapted from 'alpha' version by Gary Thomas + * Modified by Cort Dougan (cort@cs.nmt.edu) + * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net) + * Further modified for generic 8xx and 8260 by Dan. + */ + +#include <linux/config.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/stddef.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/initrd.h> +#include <linux/root_dev.h> +#include <linux/seq_file.h> +#include <linux/irq.h> + +#include <asm/mmu.h> +#include <asm/io.h> +#include <asm/pgtable.h> +#include <asm/mpc8260.h> +#include <asm/immap_cpm2.h> +#include <asm/machdep.h> +#include <asm/bootinfo.h> +#include <asm/time.h> + +#include "cpm2_pic.h" + +unsigned char __res[sizeof(bd_t)]; + +extern void cpm2_reset(void); +extern void m8260_find_bridges(void); +extern void idma_pci9_init(void); + +/* Place-holder for board-specific init */ +void __attribute__ ((weak)) __init +m82xx_board_setup(void) +{ +} + +static void __init +m8260_setup_arch(void) +{ + /* Print out Vendor and Machine info. */ + printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE); + + /* Reset the Communication Processor Module. */ + cpm2_reset(); +#ifdef CONFIG_8260_PCI9 + /* Initialise IDMA for PCI erratum workaround */ + idma_pci9_init(); +#endif +#ifdef CONFIG_PCI_8260 + m8260_find_bridges(); +#endif +#ifdef CONFIG_BLK_DEV_INITRD + if (initrd_start) + ROOT_DEV = Root_RAM0; +#endif + m82xx_board_setup(); +} + +/* The decrementer counts at the system (internal) clock frequency + * divided by four. + */ +static void __init +m8260_calibrate_decr(void) +{ + bd_t *binfo = (bd_t *)__res; + int freq, divisor; + + freq = binfo->bi_busfreq; + divisor = 4; + tb_ticks_per_jiffy = freq / HZ / divisor; + tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000); +} + +/* The 8260 has an internal 1-second timer update register that + * we should use for this purpose. + */ +static uint rtc_time; + +static int +m8260_set_rtc_time(unsigned long time) +{ + rtc_time = time; + + return(0); +} + +static unsigned long +m8260_get_rtc_time(void) +{ + /* Get time from the RTC. + */ + return((unsigned long)rtc_time); +} + +#ifndef BOOTROM_RESTART_ADDR +#warning "Using default BOOTROM_RESTART_ADDR!" +#define BOOTROM_RESTART_ADDR 0xff000104 +#endif + +static void +m8260_restart(char *cmd) +{ + extern void m8260_gorom(bd_t *bi, uint addr); + uint startaddr; + + /* Most boot roms have a warmstart as the second instruction + * of the reset vector. If that doesn't work for you, change this + * or the reboot program to send a proper address. + */ + startaddr = BOOTROM_RESTART_ADDR; + if (cmd != NULL) { + if (!strncmp(cmd, "startaddr=", 10)) + startaddr = simple_strtoul(&cmd[10], NULL, 0); + } + + m8260_gorom((void*)__pa(__res), startaddr); +} + +static void +m8260_halt(void) +{ + local_irq_disable(); + while (1); +} + +static void +m8260_power_off(void) +{ + m8260_halt(); +} + +static int +m8260_show_cpuinfo(struct seq_file *m) +{ + bd_t *bp = (bd_t *)__res; + + seq_printf(m, "vendor\t\t: %s\n" + "machine\t\t: %s\n" + "\n" + "mem size\t\t: 0x%08x\n" + "console baud\t\t: %d\n" + "\n" + "core clock\t: %u MHz\n" + "CPM clock\t: %u MHz\n" + "bus clock\t: %u MHz\n", + CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize, + bp->bi_baudrate, bp->bi_intfreq / 1000000, + bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000); + return 0; +} + +/* Initialize the internal interrupt controller. The number of + * interrupts supported can vary with the processor type, and the + * 8260 family can have up to 64. + * External interrupts can be either edge or level triggered, and + * need to be initialized by the appropriate driver. + */ +static void __init +m8260_init_IRQ(void) +{ + cpm2_init_IRQ(); + + /* Initialize the default interrupt mapping priorities, + * in case the boot rom changed something on us. + */ + cpm2_immr->im_intctl.ic_siprr = 0x05309770; +} + +/* + * Same hack as 8xx + */ +static unsigned long __init +m8260_find_end_of_memory(void) +{ + bd_t *binfo = (bd_t *)__res; + + return binfo->bi_memsize; +} + +/* Map the IMMR, plus anything else we can cover + * in that upper space according to the memory controller + * chip select mapping. Grab another bunch of space + * below that for stuff we can't cover in the upper. + */ +static void __init +m8260_map_io(void) +{ + uint addr; + + /* Map IMMR region to a 256MB BAT */ + addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR; + io_block_mapping(addr, addr, 0x10000000, _PAGE_IO); + + /* Map I/O region to a 256MB BAT */ + io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO); +} + +/* Place-holder for board-specific ppc_md hooking */ +void __attribute__ ((weak)) __init +m82xx_board_init(void) +{ +} + +/* Inputs: + * r3 - Optional pointer to a board information structure. + * r4 - Optional pointer to the physical starting address of the init RAM + * disk. + * r5 - Optional pointer to the physical ending address of the init RAM + * disk. + * r6 - Optional pointer to the physical starting address of any kernel + * command-line parameters. + * r7 - Optional pointer to the physical ending address of any kernel + * command-line parameters. + */ +void __init +platform_init(unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, unsigned long r7) +{ + parse_bootinfo(find_bootinfo()); + + if ( r3 ) + memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) ); + +#ifdef CONFIG_BLK_DEV_INITRD + /* take care of initrd if we have one */ + if ( r4 ) { + initrd_start = r4 + KERNELBASE; + initrd_end = r5 + KERNELBASE; + } +#endif /* CONFIG_BLK_DEV_INITRD */ + /* take care of cmd line */ + if ( r6 ) { + *(char *)(r7+KERNELBASE) = 0; + strcpy(cmd_line, (char *)(r6+KERNELBASE)); + } + + ppc_md.setup_arch = m8260_setup_arch; + ppc_md.show_cpuinfo = m8260_show_cpuinfo; + ppc_md.init_IRQ = m8260_init_IRQ; + ppc_md.get_irq = cpm2_get_irq; + + ppc_md.restart = m8260_restart; + ppc_md.power_off = m8260_power_off; + ppc_md.halt = m8260_halt; + + ppc_md.set_rtc_time = m8260_set_rtc_time; + ppc_md.get_rtc_time = m8260_get_rtc_time; + ppc_md.calibrate_decr = m8260_calibrate_decr; + + ppc_md.find_end_of_memory = m8260_find_end_of_memory; + ppc_md.setup_io_mappings = m8260_map_io; + + /* Call back for board-specific settings and overrides. */ + m82xx_board_init(); +} |
