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cpu.c
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cpu.c
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/* linux/arch/arm/mach-wpcm450/cpu.c
*
* Copyright (c) 2006 Winbond Electronics
* shirley yu <clyu2@winbond.com>
*
* WPCM450 CPU Support
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include "cpu.h"
#include "clock.h"
#include "wpcm450.h"
struct cpu_table {
unsigned long idcode;
unsigned long idmask;
void (*map_io)(struct map_desc *mach_desc, int size);
void (*init_uarts)(struct wpcm450_uartcfg *cfg, int no);
void (*init_clocks)(int xtal);
int (*init)(void);
const char *name;
};
/* table of supported CPUs */
static const char name_wpcm450[] = "WPCM450";
static struct cpu_table cpu_ids[] __initdata = {
{
.idcode = 0x01900910,
.idmask = 0xffffffff,
.map_io = wpcm450_map_io,
.init_clocks = wpcm450_init_clocks,
.init_uarts = wpcm450_init_uarts,
.init = wpcm450_init,
.name = name_wpcm450
},
};
/* minimal IO mapping */
static struct map_desc wpcm450_iodesc[] __initdata = {
IODESC_ENT(IRQ),
IODESC_USER(B000),
IODESC_USER(B001),
IODESC_USER(B800),
IODESC_USER(VCD_MEM)
// ,IODESC_USER(USB_MEM)
};
static struct cpu_table *
wpcm_lookup_cpu(unsigned long idcode)
{
struct cpu_table *tab;
int count;
tab = cpu_ids;
for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
if ((idcode & tab->idmask) == tab->idcode)
return tab;
}
return NULL;
}
/* board information */
static struct wpcm450_board *board;
void wpcm450_set_board(struct wpcm450_board *b)
{
int i;
board = b;
if (b->clocks_count != 0) {
struct clk **ptr = b->clocks;
for (i = b->clocks_count; i > 0; i--, ptr++)
wpcm450_register_clock(*ptr);
}
}
/* cpu information */
static struct cpu_table *cpu;
void __init wpcm450_init_io(struct map_desc *mach_desc, int size)
{
unsigned long idcode = 0x01900910;
/* initialise the io descriptors we need for initialisation */
iotable_init(wpcm450_iodesc, ARRAY_SIZE(wpcm450_iodesc));
//idcode = __raw_readl(WPCM450_GCR_PDID);
cpu = wpcm_lookup_cpu(idcode);
if (cpu == NULL) {
printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
panic("Unknown WPCM450 CPU");
}
if (cpu->map_io == NULL || cpu->init == NULL) {
printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
panic("Unsupported WPCM450 CPU");
}
printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
(cpu->map_io)(mach_desc, size);
}
/* wpcm450_init_clocks
*
* Initialise the clock subsystem and associated information from the
* given master crystal value.
*
* xtal = 0 -> use default PLL crystal value (normally 15MHz)
* != 0 -> PLL crystal value in Hz
*/
void __init wpcm4xx_init_clocks(int xtal)
{
if (xtal == 0)
xtal = 14318000;//15*1000*1000;
if (cpu == NULL)
panic("wpcm4xx_init_clocks: no cpu setup?\n");
if (cpu->init_clocks == NULL)
panic("wpcm4xx_init_clocks: cpu has no clock init\n");
else
(cpu->init_clocks)(xtal);
}
void __init wpcm4xx_init_uarts(struct wpcm450_uartcfg *cfg, int no)
{
if (cpu == NULL)
return;
if (cpu->init_uarts == NULL) {
printk(KERN_ERR "wpcm4xx_init_uarts: cpu has no uart init\n");
} else
(cpu->init_uarts)(cfg, no);
}
static int __init wpcm_arch_init(void)
{
int ret;
// do the correct init for cpu
if (cpu == NULL)
panic("wpcm_arch_init: NULL cpu\n");
ret = (cpu->init)();
if (ret != 0)
return ret;
if (board != NULL) {
struct platform_device **ptr = board->devices;
int i;
for (i = 0; i < board->devices_count; i++, ptr++) {
ret = platform_device_register(*ptr);
if (ret) {
printk(KERN_ERR "wpcm450: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
}
}
/* mask any error, we may not need all these board
* devices */
ret = 0;
}
return ret;
}
arch_initcall(wpcm_arch_init);