1 /* linux/arch/arm/mach-s3c2410/cpu.c
3 * Copyright (c) 2004-2005 Simtec Electronics
4 * http://www.simtec.co.uk/products/SWLINUX/
5 * Ben Dooks <ben@simtec.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/interrupt.h>
28 #include <linux/ioport.h>
29 #include <linux/platform_device.h>
31 #include <asm/hardware.h>
34 #include <asm/delay.h>
36 #include <asm/mach/arch.h>
37 #include <asm/mach/map.h>
39 #include <asm/arch/regs-gpio.h>
50 void (*map_io)(struct map_desc *mach_desc, int size);
51 void (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
52 void (*init_clocks)(int xtal);
57 /* table of supported CPUs */
59 static const char name_s3c2400[] = "S3C2400";
60 static const char name_s3c2410[] = "S3C2410";
61 static const char name_s3c2440[] = "S3C2440";
62 static const char name_s3c2410a[] = "S3C2410A";
63 static const char name_s3c2440a[] = "S3C2440A";
65 static struct cpu_table cpu_ids[] __initdata = {
69 .map_io = s3c2410_map_io,
70 .init_clocks = s3c2410_init_clocks,
71 .init_uarts = s3c2410_init_uarts,
78 .map_io = s3c2410_map_io,
79 .init_clocks = s3c2410_init_clocks,
80 .init_uarts = s3c2410_init_uarts,
87 .map_io = s3c2440_map_io,
88 .init_clocks = s3c2440_init_clocks,
89 .init_uarts = s3c2440_init_uarts,
96 .map_io = s3c2440_map_io,
97 .init_clocks = s3c2440_init_clocks,
98 .init_uarts = s3c2440_init_uarts,
100 .name = name_s3c2440a
103 .idcode = 0x0, /* S3C2400 doesn't have an idcode */
104 .idmask = 0xffffffff,
105 .map_io = s3c2400_map_io,
106 .init_clocks = s3c2400_init_clocks,
107 .init_uarts = s3c2400_init_uarts,
108 .init = s3c2400_init,
113 /* minimal IO mapping */
115 static struct map_desc s3c_iodesc[] __initdata = {
123 static struct cpu_table *
124 s3c_lookup_cpu(unsigned long idcode)
126 struct cpu_table *tab;
130 for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
131 if ((idcode & tab->idmask) == tab->idcode)
138 /* board information */
140 static struct s3c24xx_board *board;
142 void s3c24xx_set_board(struct s3c24xx_board *b)
148 if (b->clocks_count != 0) {
149 struct clk **ptr = b->clocks;
151 for (i = b->clocks_count; i > 0; i--, ptr++)
152 s3c24xx_register_clock(*ptr);
156 /* cpu information */
158 static struct cpu_table *cpu;
160 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
162 unsigned long idcode = 0x0;
164 /* initialise the io descriptors we need for initialisation */
165 iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
167 #ifndef CONFIG_CPU_S3C2400
168 idcode = __raw_readl(S3C2410_GSTATUS1);
171 cpu = s3c_lookup_cpu(idcode);
174 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
175 panic("Unknown S3C24XX CPU");
178 if (cpu->map_io == NULL || cpu->init == NULL) {
179 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
180 panic("Unsupported S3C24XX CPU");
183 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
185 (cpu->map_io)(mach_desc, size);
188 /* s3c24xx_init_clocks
190 * Initialise the clock subsystem and associated information from the
191 * given master crystal value.
193 * xtal = 0 -> use default PLL crystal value (normally 12MHz)
194 * != 0 -> PLL crystal value in Hz
197 void __init s3c24xx_init_clocks(int xtal)
203 panic("s3c24xx_init_clocks: no cpu setup?\n");
205 if (cpu->init_clocks == NULL)
206 panic("s3c24xx_init_clocks: cpu has no clock init\n");
208 (cpu->init_clocks)(xtal);
211 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
216 if (cpu->init_uarts == NULL) {
217 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
219 (cpu->init_uarts)(cfg, no);
222 static int __init s3c_arch_init(void)
226 // do the correct init for cpu
229 panic("s3c_arch_init: NULL cpu\n");
236 struct platform_device **ptr = board->devices;
239 for (i = 0; i < board->devices_count; i++, ptr++) {
240 ret = platform_device_register(*ptr);
243 printk(KERN_ERR "s3c24xx: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
247 /* mask any error, we may not need all these board
255 arch_initcall(s3c_arch_init);