![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
242 lines
5.3 KiB
C
242 lines
5.3 KiB
C
/* linux/arch/arm/mach-s3c2410/cpu.c
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*
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* Copyright (c) 2004-2005 Simtec Electronics
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* http://www.simtec.co.uk/products/SWLINUX/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX CPU Support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/device.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/delay.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/arch/regs-gpio.h>
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#include "cpu.h"
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#include "clock.h"
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#include "s3c2410.h"
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#include "s3c2440.h"
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struct cpu_table {
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unsigned long idcode;
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unsigned long idmask;
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void (*map_io)(struct map_desc *mach_desc, int size);
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void (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
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void (*init_clocks)(int xtal);
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int (*init)(void);
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const char *name;
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};
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/* table of supported CPUs */
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static const char name_s3c2410[] = "S3C2410";
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static const char name_s3c2440[] = "S3C2440";
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static const char name_s3c2410a[] = "S3C2410A";
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static const char name_s3c2440a[] = "S3C2440A";
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static struct cpu_table cpu_ids[] __initdata = {
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{
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.idcode = 0x32410000,
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.idmask = 0xffffffff,
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.map_io = s3c2410_map_io,
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.init_clocks = s3c2410_init_clocks,
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.init_uarts = s3c2410_init_uarts,
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.init = s3c2410_init,
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.name = name_s3c2410
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},
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{
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.idcode = 0x32410002,
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.idmask = 0xffffffff,
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.map_io = s3c2410_map_io,
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.init_clocks = s3c2410_init_clocks,
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.init_uarts = s3c2410_init_uarts,
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.init = s3c2410_init,
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.name = name_s3c2410a
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},
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{
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.idcode = 0x32440000,
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.idmask = 0xffffffff,
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.map_io = s3c2440_map_io,
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.init_clocks = s3c2440_init_clocks,
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.init_uarts = s3c2440_init_uarts,
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.init = s3c2440_init,
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.name = name_s3c2440
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},
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{
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.idcode = 0x32440001,
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.idmask = 0xffffffff,
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.map_io = s3c2440_map_io,
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.init_clocks = s3c2440_init_clocks,
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.init_uarts = s3c2440_init_uarts,
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.init = s3c2440_init,
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.name = name_s3c2440a
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}
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};
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/* minimal IO mapping */
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static struct map_desc s3c_iodesc[] __initdata = {
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IODESC_ENT(GPIO),
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IODESC_ENT(IRQ),
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IODESC_ENT(MEMCTRL),
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IODESC_ENT(UART)
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};
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static struct cpu_table *
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s3c_lookup_cpu(unsigned long idcode)
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{
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struct cpu_table *tab;
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int count;
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tab = cpu_ids;
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for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
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if ((idcode & tab->idmask) == tab->idcode)
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return tab;
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}
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return NULL;
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}
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/* board information */
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static struct s3c24xx_board *board;
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void s3c24xx_set_board(struct s3c24xx_board *b)
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{
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int i;
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board = b;
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if (b->clocks_count != 0) {
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struct clk **ptr = b->clocks;;
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for (i = b->clocks_count; i > 0; i--, ptr++)
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s3c24xx_register_clock(*ptr);
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}
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}
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/* cpu information */
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static struct cpu_table *cpu;
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void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
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{
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unsigned long idcode;
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/* initialise the io descriptors we need for initialisation */
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iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
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idcode = __raw_readl(S3C2410_GSTATUS1);
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cpu = s3c_lookup_cpu(idcode);
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if (cpu == NULL) {
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printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
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panic("Unknown S3C24XX CPU");
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}
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if (cpu->map_io == NULL || cpu->init == NULL) {
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printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
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panic("Unsupported S3C24XX CPU");
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}
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printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
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(cpu->map_io)(mach_desc, size);
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}
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/* s3c24xx_init_clocks
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*
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* Initialise the clock subsystem and associated information from the
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* given master crystal value.
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*
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* xtal = 0 -> use default PLL crystal value (normally 12MHz)
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* != 0 -> PLL crystal value in Hz
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*/
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void __init s3c24xx_init_clocks(int xtal)
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{
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if (xtal == 0)
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xtal = 12*1000*1000;
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if (cpu == NULL)
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panic("s3c24xx_init_clocks: no cpu setup?\n");
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if (cpu->init_clocks == NULL)
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panic("s3c24xx_init_clocks: cpu has no clock init\n");
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else
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(cpu->init_clocks)(xtal);
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}
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void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
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{
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if (cpu == NULL)
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return;
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if (cpu->init_uarts == NULL) {
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printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
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} else
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(cpu->init_uarts)(cfg, no);
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}
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static int __init s3c_arch_init(void)
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{
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int ret;
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// do the correct init for cpu
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if (cpu == NULL)
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panic("s3c_arch_init: NULL cpu\n");
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ret = (cpu->init)();
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if (ret != 0)
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return ret;
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if (board != NULL) {
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struct platform_device **ptr = board->devices;
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int i;
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for (i = 0; i < board->devices_count; i++, ptr++) {
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ret = platform_device_register(*ptr);
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if (ret) {
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printk(KERN_ERR "s3c24xx: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
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}
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}
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/* mask any error, we may not need all these board
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* devices */
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ret = 0;
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}
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return ret;
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}
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arch_initcall(s3c_arch_init);
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