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openwrt-xburst/target/linux/coldfire/files-2.6.31/arch/m68k/coldfire/m547x/config.c
kaloz 12a0868f92 [coldfire]: 2.6.31 support (WiP) 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24087 3c298f89-4303-0410-b956-a3cf2f4a3e73
2010-11-22 13:29:58 +00:00

436 lines
11 KiB
C
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/*
* linux/arch/m68k/coldfire/config.c
*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
* Kurt Mahan kmahan@freescale.com
* Matt Waddel Matt.Waddel@freescale.com
* Shrek Wu b16972@freescale.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/clockchips.h>
#include <asm/bootinfo.h>
#include <asm/machdep.h>
#include <asm/coldfire.h>
#include <asm/cfcache.h>
#include <asm/cacheflush.h>
#include <linux/io.h>
#include <asm/cfmmu.h>
#include <asm/setup.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/movs.h>
#include <asm/movs.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/mcfsim.h>
#define UBOOT_PCI
#include <asm/bootinfo.h>
#include <asm/m5485gpt.h>
extern int get_irq_list(struct seq_file *p, void *v);
extern char _text, _end;
extern char _etext, _edata, __init_begin, __init_end;
extern struct console mcfrs_console;
extern char m68k_command_line[CL_SIZE];
extern unsigned long availmem;
static int irq_enable[NR_IRQS];
unsigned long num_pages;
/* cf dma physical addresses */
unsigned long cf_dma_base;
unsigned long cf_dma_end;
unsigned long cf_dma_size;
EXPORT_SYMBOL(cf_dma_base);
EXPORT_SYMBOL(cf_dma_end);
EXPORT_SYMBOL(cf_dma_size);
/* ethernet mac addresses from uboot */
unsigned char uboot_enet0[6];
unsigned char uboot_enet1[6];
void coldfire_sort_memrec(void)
{
int i, j;
/* Sort the m68k_memory records by address */
for (i = 0; i < m68k_num_memory; ++i) {
for (j = i + 1; j < m68k_num_memory; ++j) {
if (m68k_memory[i].addr > m68k_memory[j].addr) {
struct mem_info tmp;
tmp = m68k_memory[i];
m68k_memory[i] = m68k_memory[j];
m68k_memory[j] = tmp;
}
}
}
/* Trim off discontiguous bits */
for (i = 1; i < m68k_num_memory; ++i) {
if ((m68k_memory[i-1].addr + m68k_memory[i-1].size) !=
m68k_memory[i].addr) {
printk(KERN_DEBUG "m68k_parse_bootinfo: "
"addr gap between 0x%lx & 0x%lx\n",
m68k_memory[i-1].addr+m68k_memory[i-1].size,
m68k_memory[i].addr);
m68k_num_memory = i;
break;
}
}
}
/*
* UBoot Handler
*/
int __init uboot_commandline(char *bootargs)
{
int len = 0, cmd_line_len;
static struct uboot_record uboot_info;
u32 offset = PAGE_OFFSET_RAW - PHYS_OFFSET;
extern unsigned long uboot_info_stk;
/* validate address */
if ((uboot_info_stk < PAGE_OFFSET_RAW) ||
(uboot_info_stk >= (PAGE_OFFSET_RAW + CONFIG_SDRAM_SIZE)))
return 0;
/* Add offset to get post-remapped kernel memory location */
uboot_info.bdi = (struct bd_info *)((*(u32 *)(uboot_info_stk))
+ offset);
uboot_info.initrd_start = (*(u32 *)(uboot_info_stk+4)) + offset;
uboot_info.initrd_end = (*(u32 *)(uboot_info_stk+8)) + offset;
uboot_info.cmd_line_start = (*(u32 *)(uboot_info_stk+12)) + offset;
uboot_info.cmd_line_stop = (*(u32 *)(uboot_info_stk+16)) + offset;
/* copy over mac addresses */
memcpy(uboot_enet0, uboot_info.bdi->bi_enet0addr, 6);
memcpy(uboot_enet1, uboot_info.bdi->bi_enet1addr, 6);
/* copy command line */
cmd_line_len = uboot_info.cmd_line_stop - uboot_info.cmd_line_start;
if ((cmd_line_len > 0) && (cmd_line_len < CL_SIZE-1))
len = (int)strncpy(bootargs, (char *)uboot_info.cmd_line_start,\
cmd_line_len);
return len;
}
/*
* This routine does things not done in the bootloader.
*/
#define DEFAULT_COMMAND_LINE \
"debug root=/dev/nfs rw \
nfsroot=172.27.155.1:/tftpboot/rigo/rootfs/ \
ip=172.27.155.75:172.27.155.1"
asmlinkage void __init cf_early_init(void)
{
struct bi_record *record = (struct bi_record *) &_end;
extern char _end;
SET_VBR((void *)MCF_RAMBAR0);
/* Mask all interrupts */
MCF_IMRL = 0xFFFFFFFF;
MCF_IMRH = 0xFFFFFFFF;
m68k_machtype = MACH_CFMMU;
m68k_fputype = FPU_CFV4E;
m68k_mmutype = MMU_CFV4E;
m68k_cputype = CPU_CFV4E;
m68k_num_memory = 0;
m68k_memory[m68k_num_memory].addr = CONFIG_SDRAM_BASE;
m68k_memory[m68k_num_memory++].size = CONFIG_SDRAM_SIZE;
if (!uboot_commandline(m68k_command_line)) {
#if defined(CONFIG_BOOTPARAM)
strncpy(m68k_command_line, CONFIG_BOOTPARAM_STRING, CL_SIZE-1);
#else
strcpy(m68k_command_line, DEFAULT_COMMAND_LINE);
#endif
}
#if defined(CONFIG_BLK_DEV_INITRD)
/* add initrd image */
record = (struct bi_record *) ((void *)record + record->size);
record->tag = BI_RAMDISK;
record->size = sizeof(record->tag) + sizeof(record->size)
+ sizeof(record->data[0]) + sizeof(record->data[1]);
#endif
/* Mark end of tags. */
record = (struct bi_record *) ((void *) record + record->size);
record->tag = 0;
record->data[0] = 0;
record->data[1] = 0;
record->size = sizeof(record->tag) + sizeof(record->size)
+ sizeof(record->data[0]) + sizeof(record->data[1]);
/* Invalidate caches via CACR */
flush_bcache();
cacr_set(CACHE_DISABLE_MODE);
/* Turn on caches via CACR, enable EUSP */
cacr_set(CACHE_INITIAL_MODE);
}
/* Assembler routines */
asmlinkage void buserr(void);
asmlinkage void trap(void);
asmlinkage void system_call(void);
asmlinkage void inthandler(void);
void __init coldfire_trap_init(void)
{
int i = 0;
e_vector *vectors;
vectors = (e_vector *)MCF_RAMBAR0;
/*
* There is a common trap handler and common interrupt
* handler that handle almost every vector. We treat
* the system call and bus error special, they get their
* own first level handlers.
*/
for (i = 3; (i <= 23); i++)
vectors[i] = trap;
for (i = 33; (i <= 63); i++)
vectors[i] = trap;
for (i = 24; (i <= 31); i++)
vectors[i] = inthandler;
for (i = 64; (i < 255); i++)
vectors[i] = inthandler;
vectors[255] = 0;
vectors[2] = buserr;
vectors[32] = system_call;
}
#ifndef CONFIG_GENERIC_CLOCKEVENTS
void coldfire_tick(void)
{
/* Reset the ColdFire timer */
MCF_SSR(0) = MCF_SSR_ST;
}
void __init coldfire_sched_init(irq_handler_t handler)
{
int irq = ISC_SLTn(0);
MCF_SCR(0) = 0;
MCF_ICR(irq) = ILP_SLT0;
request_irq(64 + irq, handler, IRQF_DISABLED, "ColdFire Timer 0", NULL);
MCF_SLTCNT(0) = MCF_BUSCLK / HZ;
MCF_SCR(0) |= MCF_SCR_TEN | MCF_SCR_IEN | MCF_SCR_RUN;
}
unsigned long coldfire_gettimeoffset(void)
{
volatile unsigned long trr, tcn, offset;
trr = MCF_SLTCNT(0);
tcn = MCF_SCNT(0);
offset = (trr - tcn) * ((1000000 >> 3) / HZ) / (trr >> 3);
if (MCF_SSR(0) & MCF_SSR_ST)
offset += 1000000 / HZ;
return offset;
}
#else
static unsigned long long sched_dtim_clk_val;
unsigned long long sched_clock(void)
{
unsigned long flags;
unsigned long long cycles;
volatile unsigned long trr, tcn, offset;
local_irq_save(flags);
trr = MCF_SLTCNT(0);
tcn = MCF_SCNT(0);
offset = (trr - tcn);
cycles = sched_dtim_clk_val;
local_irq_restore(flags);
return cycles + offset;
}
unsigned long long sys_dtim2_read(void)
{
unsigned long flags;
unsigned long long cycles;
volatile unsigned long trr, tcn, offset;
local_irq_save(flags);
trr = MCF_SLTCNT(0);
tcn = MCF_SCNT(0);
offset = (trr - tcn);
cycles = sched_dtim_clk_val;
local_irq_restore(flags);
return cycles + offset;
}
static irqreturn_t coldfire_dtim_clk_irq(int irq, void *dev)
{
struct clock_event_device *evt =
(struct clock_event_device *)dev;
MCF_SSR(0) = MCF_SSR_ST;
sched_dtim_clk_val += (MCF_BUSCLK) / HZ;;
evt->event_handler(evt);
return IRQ_HANDLED;
}
void sys_dtim2_init(struct clock_event_device *evt)
{
int irq = ISC_SLTn(0);
sched_dtim_clk_val = 0;
MCF_SCR(0) = 0;
MCF_ICR(irq) = ILP_SLT0;
request_irq(64 + irq, coldfire_dtim_clk_irq, IRQF_DISABLED,
"ColdFire Timer 0", (void *)evt);
MCF_SLTCNT(0) = MCF_BUSCLK / HZ;
MCF_SCR(0) |= MCF_SCR_TEN | MCF_SCR_IEN | MCF_SCR_RUN;
}
#endif
void coldfire_reboot(void)
{
/* disable interrupts and enable the watchdog */
printk(KERN_INFO "Rebooting\n");
asm("movew #0x2700, %sr\n");
MCF_GPT_GMS0 = MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4);
}
static void coldfire_get_model(char *model)
{
sprintf(model, "Version 4 ColdFire");
}
static void __init
coldfire_bootmem_alloc(unsigned long memory_start, unsigned long memory_end)
{
unsigned long base_pfn;
/* compute total pages in system */
num_pages = PAGE_ALIGN(memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
/* align start/end to page boundries */
memory_start = PAGE_ALIGN(memory_start);
memory_end = memory_end & PAGE_MASK;
/* page numbers */
base_pfn = __pa(PAGE_OFFSET) >> PAGE_SHIFT;
min_low_pfn = __pa(memory_start) >> PAGE_SHIFT;
max_low_pfn = __pa(memory_end) >> PAGE_SHIFT;
high_memory = (void *)memory_end;
availmem = memory_start;
/* setup bootmem data */
m68k_setup_node(0);
availmem += init_bootmem_node(NODE_DATA(0), min_low_pfn,
base_pfn, max_low_pfn);
availmem = PAGE_ALIGN(availmem);
printk(KERN_INFO "** availmem=0x%lx pa(am)=0x%lx\n",
availmem, __pa(availmem));
printk(KERN_INFO "** mstart=0x%lx mend=0x%lx\n",
memory_start, memory_end);
printk(KERN_INFO "bpfn=0x%lx minpfn=0x%lx maxpfn=0x%lx\n",
base_pfn, min_low_pfn, max_low_pfn);
/* turn over physram */
free_bootmem(__pa(availmem), memory_end - (availmem));
/* configure physical dma area */
cf_dma_base = __pa(PAGE_ALIGN(memory_start));
cf_dma_size = CONFIG_DMA_SIZE;
cf_dma_end = CONFIG_SDRAM_BASE + cf_dma_size - 1;
printk(KERN_INFO "dma: phys base=0x%lx phys end=0x%lx virt base=0x%x\n",
cf_dma_base, cf_dma_end, CONFIG_DMA_BASE);
printk(KERN_INFO "mdma=0x%x pa(mdma)=0x%lx\n",
MAX_DMA_ADDRESS, __pa(MAX_DMA_ADDRESS));
}
void __init config_coldfire(void)
{
unsigned long endmem, startmem;
int i;
/*
* Calculate endmem from m68k_memory, assume all are contiguous
*/
startmem = ((((int) &_end) + (PAGE_SIZE - 1)) & PAGE_MASK);
endmem = PAGE_OFFSET;
for (i = 0; i < m68k_num_memory; ++i)
endmem += m68k_memory[i].size;
printk(KERN_INFO "starting up linux startmem 0x%lx, endmem 0x%lx, \
size %luMB\n", startmem, endmem, (endmem - startmem) >> 20);
memset(irq_enable, 0, sizeof(irq_enable));
/*
* Setup coldfire mach-specific handlers
*/
mach_max_dma_address = 0xffffffff;
#ifndef CONFIG_GENERIC_CLOCKEVENTS
mach_sched_init = coldfire_sched_init;
mach_tick = coldfire_tick;
mach_gettimeoffset = coldfire_gettimeoffset;
#endif
mach_reset = coldfire_reboot;
/* mach_hwclk = coldfire_hwclk; to be done */
mach_get_model = coldfire_get_model;
coldfire_bootmem_alloc(startmem, endmem-1);
/*
* initrd setup
*/
/* #ifdef CONFIG_BLK_DEV_INITRD
if (m68k_ramdisk.size) {
reserve_bootmem (__pa(m68k_ramdisk.addr), m68k_ramdisk.size);
initrd_start = (unsigned long) m68k_ramdisk.addr;
initrd_end = initrd_start + m68k_ramdisk.size;
printk (KERN_DEBUG "initrd: %08lx - %08lx\n", initrd_start,
initrd_end);
}
#endif */
#if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_FRAMEBUFFER_CONSOLE)
conswitchp = &dummy_con;
#endif
#if defined(CONFIG_SERIAL_COLDFIRE)
/*
* This causes trouble when it is re-registered later.
* Currently this is fixed by conditionally commenting
* out the register_console in mcf_serial.c
*/
register_console(&mcfrs_console);
#endif
}
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