a6dbba77a9
This patch adds on-chip PCI bridge support for the PQ2 family. The incomplete existent code is updated with interrupt handling stuff and board-specific bits for 8272ADS and PQ2FADS; the related files were renamed (from m8260_pci to m82xx_pci) to be of more generic fashion. This is tested with 8266ADS and 8272ADS, should work on PQ2FADS as well. Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
272 lines
6.4 KiB
C
272 lines
6.4 KiB
C
/*
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* arch/ppc/syslib/m8260_setup.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Adapted from 'alpha' version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
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* Further modified for generic 8xx and 8260 by Dan.
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/root_dev.h>
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#include <linux/seq_file.h>
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#include <linux/irq.h>
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#include <asm/mmu.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/mpc8260.h>
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#include <asm/immap_cpm2.h>
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#include <asm/machdep.h>
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#include <asm/bootinfo.h>
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#include <asm/time.h>
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#include "cpm2_pic.h"
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unsigned char __res[sizeof(bd_t)];
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extern void cpm2_reset(void);
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extern void pq2_find_bridges(void);
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extern void pq2pci_init_irq(void);
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extern void idma_pci9_init(void);
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/* Place-holder for board-specific init */
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void __attribute__ ((weak)) __init
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m82xx_board_setup(void)
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{
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}
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static void __init
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m8260_setup_arch(void)
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{
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/* Print out Vendor and Machine info. */
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printk(KERN_INFO "%s %s port\n", CPUINFO_VENDOR, CPUINFO_MACHINE);
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/* Reset the Communication Processor Module. */
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cpm2_reset();
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#ifdef CONFIG_8260_PCI9
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/* Initialise IDMA for PCI erratum workaround */
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idma_pci9_init();
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#endif
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#ifdef CONFIG_PCI_8260
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pq2_find_bridges();
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start)
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ROOT_DEV = Root_RAM0;
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#endif
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m82xx_board_setup();
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}
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/* The decrementer counts at the system (internal) clock frequency
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* divided by four.
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*/
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static void __init
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m8260_calibrate_decr(void)
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{
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bd_t *binfo = (bd_t *)__res;
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int freq, divisor;
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freq = binfo->bi_busfreq;
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divisor = 4;
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tb_ticks_per_jiffy = freq / HZ / divisor;
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tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
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}
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/* The 8260 has an internal 1-second timer update register that
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* we should use for this purpose.
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*/
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static uint rtc_time;
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static int
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m8260_set_rtc_time(unsigned long time)
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{
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rtc_time = time;
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return(0);
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}
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static unsigned long
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m8260_get_rtc_time(void)
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{
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/* Get time from the RTC.
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*/
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return((unsigned long)rtc_time);
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}
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#ifndef BOOTROM_RESTART_ADDR
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#warning "Using default BOOTROM_RESTART_ADDR!"
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#define BOOTROM_RESTART_ADDR 0xff000104
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#endif
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static void
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m8260_restart(char *cmd)
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{
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extern void m8260_gorom(bd_t *bi, uint addr);
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uint startaddr;
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/* Most boot roms have a warmstart as the second instruction
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* of the reset vector. If that doesn't work for you, change this
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* or the reboot program to send a proper address.
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*/
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startaddr = BOOTROM_RESTART_ADDR;
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if (cmd != NULL) {
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if (!strncmp(cmd, "startaddr=", 10))
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startaddr = simple_strtoul(&cmd[10], NULL, 0);
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}
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m8260_gorom((void*)__pa(__res), startaddr);
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}
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static void
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m8260_halt(void)
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{
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local_irq_disable();
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while (1);
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}
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static void
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m8260_power_off(void)
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{
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m8260_halt();
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}
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static int
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m8260_show_cpuinfo(struct seq_file *m)
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{
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bd_t *bp = (bd_t *)__res;
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seq_printf(m, "vendor\t\t: %s\n"
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"machine\t\t: %s\n"
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"\n"
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"mem size\t\t: 0x%08x\n"
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"console baud\t\t: %d\n"
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"\n"
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"core clock\t: %u MHz\n"
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"CPM clock\t: %u MHz\n"
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"bus clock\t: %u MHz\n",
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CPUINFO_VENDOR, CPUINFO_MACHINE, bp->bi_memsize,
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bp->bi_baudrate, bp->bi_intfreq / 1000000,
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bp->bi_cpmfreq / 1000000, bp->bi_busfreq / 1000000);
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return 0;
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}
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/* Initialize the internal interrupt controller. The number of
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* interrupts supported can vary with the processor type, and the
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* 8260 family can have up to 64.
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* External interrupts can be either edge or level triggered, and
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* need to be initialized by the appropriate driver.
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*/
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static void __init
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m8260_init_IRQ(void)
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{
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cpm2_init_IRQ();
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/* Initialize the default interrupt mapping priorities,
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* in case the boot rom changed something on us.
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*/
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cpm2_immr->im_intctl.ic_siprr = 0x05309770;
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#if defined(CONFIG_PCI) && (defined(CONFIG_ADS8272) || defined(CONFIG_PQ2FADS))
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/* Initialize stuff for the 82xx CPLD IC and install demux */
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pq2pci_init_irq();
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#endif
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}
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/*
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* Same hack as 8xx
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*/
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static unsigned long __init
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m8260_find_end_of_memory(void)
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{
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bd_t *binfo = (bd_t *)__res;
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return binfo->bi_memsize;
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}
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/* Map the IMMR, plus anything else we can cover
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* in that upper space according to the memory controller
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* chip select mapping. Grab another bunch of space
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* below that for stuff we can't cover in the upper.
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*/
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static void __init
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m8260_map_io(void)
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{
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uint addr;
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/* Map IMMR region to a 256MB BAT */
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addr = (cpm2_immr != NULL) ? (uint)cpm2_immr : CPM_MAP_ADDR;
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io_block_mapping(addr, addr, 0x10000000, _PAGE_IO);
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/* Map I/O region to a 256MB BAT */
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io_block_mapping(IO_VIRT_ADDR, IO_PHYS_ADDR, 0x10000000, _PAGE_IO);
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}
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/* Place-holder for board-specific ppc_md hooking */
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void __attribute__ ((weak)) __init
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m82xx_board_init(void)
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{
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}
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/* Inputs:
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* r3 - Optional pointer to a board information structure.
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* r4 - Optional pointer to the physical starting address of the init RAM
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* disk.
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* r5 - Optional pointer to the physical ending address of the init RAM
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* disk.
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* r6 - Optional pointer to the physical starting address of any kernel
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* command-line parameters.
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* r7 - Optional pointer to the physical ending address of any kernel
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* command-line parameters.
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*/
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void __init
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platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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parse_bootinfo(find_bootinfo());
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if ( r3 )
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memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
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#ifdef CONFIG_BLK_DEV_INITRD
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/* take care of initrd if we have one */
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if ( r4 ) {
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initrd_start = r4 + KERNELBASE;
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initrd_end = r5 + KERNELBASE;
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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/* take care of cmd line */
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if ( r6 ) {
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*(char *)(r7+KERNELBASE) = 0;
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strcpy(cmd_line, (char *)(r6+KERNELBASE));
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}
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ppc_md.setup_arch = m8260_setup_arch;
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ppc_md.show_cpuinfo = m8260_show_cpuinfo;
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ppc_md.init_IRQ = m8260_init_IRQ;
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ppc_md.get_irq = cpm2_get_irq;
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ppc_md.restart = m8260_restart;
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ppc_md.power_off = m8260_power_off;
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ppc_md.halt = m8260_halt;
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ppc_md.set_rtc_time = m8260_set_rtc_time;
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ppc_md.get_rtc_time = m8260_get_rtc_time;
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ppc_md.calibrate_decr = m8260_calibrate_decr;
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ppc_md.find_end_of_memory = m8260_find_end_of_memory;
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ppc_md.setup_io_mappings = m8260_map_io;
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/* Call back for board-specific settings and overrides. */
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m82xx_board_init();
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}
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