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>
40 #include <asm/arch/regs-serial.h>
54 void (*map_io)(struct map_desc *mach_desc, int size);
55 void (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
56 void (*init_clocks)(int xtal);
61 /* table of supported CPUs */
63 static const char name_s3c2400[] = "S3C2400";
64 static const char name_s3c2410[] = "S3C2410";
65 static const char name_s3c2440[] = "S3C2440";
66 static const char name_s3c2442[] = "S3C2442";
67 static const char name_s3c2410a[] = "S3C2410A";
68 static const char name_s3c2440a[] = "S3C2440A";
70 static struct cpu_table cpu_ids[] __initdata = {
74 .map_io = s3c2410_map_io,
75 .init_clocks = s3c2410_init_clocks,
76 .init_uarts = s3c2410_init_uarts,
83 .map_io = s3c2410_map_io,
84 .init_clocks = s3c2410_init_clocks,
85 .init_uarts = s3c2410_init_uarts,
92 .map_io = s3c244x_map_io,
93 .init_clocks = s3c244x_init_clocks,
94 .init_uarts = s3c244x_init_uarts,
100 .idmask = 0xffffffff,
101 .map_io = s3c244x_map_io,
102 .init_clocks = s3c244x_init_clocks,
103 .init_uarts = s3c244x_init_uarts,
104 .init = s3c2440_init,
105 .name = name_s3c2440a
108 .idcode = 0x32440aaa,
109 .idmask = 0xffffffff,
110 .map_io = s3c244x_map_io,
111 .init_clocks = s3c244x_init_clocks,
112 .init_uarts = s3c244x_init_uarts,
113 .init = s3c2442_init,
117 .idcode = 0x0, /* S3C2400 doesn't have an idcode */
118 .idmask = 0xffffffff,
119 .map_io = s3c2400_map_io,
120 .init_clocks = s3c2400_init_clocks,
121 .init_uarts = s3c2400_init_uarts,
122 .init = s3c2400_init,
127 /* minimal IO mapping */
129 static struct map_desc s3c_iodesc[] __initdata = {
137 static struct cpu_table *
138 s3c_lookup_cpu(unsigned long idcode)
140 struct cpu_table *tab;
144 for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
145 if ((idcode & tab->idmask) == tab->idcode)
152 /* board information */
154 static struct s3c24xx_board *board;
156 void s3c24xx_set_board(struct s3c24xx_board *b)
162 if (b->clocks_count != 0) {
163 struct clk **ptr = b->clocks;
165 for (i = b->clocks_count; i > 0; i--, ptr++)
166 s3c24xx_register_clock(*ptr);
170 /* cpu information */
172 static struct cpu_table *cpu;
174 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
176 unsigned long idcode = 0x0;
178 /* initialise the io descriptors we need for initialisation */
179 iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
181 #ifndef CONFIG_CPU_S3C2400
182 idcode = __raw_readl(S3C2410_GSTATUS1);
185 cpu = s3c_lookup_cpu(idcode);
188 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
189 panic("Unknown S3C24XX CPU");
192 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
194 if (cpu->map_io == NULL || cpu->init == NULL) {
195 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
196 panic("Unsupported S3C24XX CPU");
199 (cpu->map_io)(mach_desc, size);
202 /* s3c24xx_init_clocks
204 * Initialise the clock subsystem and associated information from the
205 * given master crystal value.
207 * xtal = 0 -> use default PLL crystal value (normally 12MHz)
208 * != 0 -> PLL crystal value in Hz
211 void __init s3c24xx_init_clocks(int xtal)
217 panic("s3c24xx_init_clocks: no cpu setup?\n");
219 if (cpu->init_clocks == NULL)
220 panic("s3c24xx_init_clocks: cpu has no clock init\n");
222 (cpu->init_clocks)(xtal);
225 /* uart management */
227 static int nr_uarts __initdata = 0;
229 static struct s3c2410_uartcfg uart_cfgs[3];
231 /* s3c24xx_init_uartdevs
233 * copy the specified platform data and configuration into our central
234 * set of devices, before the data is thrown away after the init process.
236 * This also fills in the array passed to the serial driver for the
237 * early initialisation of the console.
240 void __init s3c24xx_init_uartdevs(char *name,
241 struct s3c24xx_uart_resources *res,
242 struct s3c2410_uartcfg *cfg, int no)
244 struct platform_device *platdev;
245 struct s3c2410_uartcfg *cfgptr = uart_cfgs;
246 struct s3c24xx_uart_resources *resp;
249 memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
251 for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
252 platdev = s3c24xx_uart_src[cfgptr->hwport];
254 resp = res + cfgptr->hwport;
256 s3c24xx_uart_devs[uart] = platdev;
258 platdev->name = name;
259 platdev->resource = resp->resources;
260 platdev->num_resources = resp->nr_resources;
262 platdev->dev.platform_data = cfgptr;
268 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
273 if (cpu->init_uarts == NULL) {
274 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
276 (cpu->init_uarts)(cfg, no);
279 static int __init s3c_arch_init(void)
283 // do the correct init for cpu
286 panic("s3c_arch_init: NULL cpu\n");
292 ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
297 struct platform_device **ptr = board->devices;
300 for (i = 0; i < board->devices_count; i++, ptr++) {
301 ret = platform_device_register(*ptr);
304 printk(KERN_ERR "s3c24xx: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
308 /* mask any error, we may not need all these board
316 arch_initcall(s3c_arch_init);