1 /* linux/arch/arm/plat-s3c24xx/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/serial_core.h>
30 #include <linux/platform_device.h>
31 #include <linux/delay.h>
33 #include <linux/delay.h>
35 #include <mach/hardware.h>
37 #include <asm/cacheflush.h>
39 #include <asm/mach/arch.h>
40 #include <asm/mach/map.h>
42 #include <mach/system-reset.h>
44 #include <mach/regs-gpio.h>
45 #include <plat/regs-serial.h>
48 #include <plat/devs.h>
49 #include <plat/clock.h>
50 #include <plat/s3c2400.h>
51 #include <plat/s3c2410.h>
52 #include <plat/s3c2412.h>
54 #include <plat/s3c2440.h>
55 #include <plat/s3c2442.h>
56 #include <plat/s3c2443.h>
61 void (*map_io)(struct map_desc *mach_desc, int size);
62 void (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
63 void (*init_clocks)(int xtal);
68 /* table of supported CPUs */
70 static const char name_s3c2400[] = "S3C2400";
71 static const char name_s3c2410[] = "S3C2410";
72 static const char name_s3c2412[] = "S3C2412";
73 static const char name_s3c2440[] = "S3C2440";
74 static const char name_s3c2442[] = "S3C2442";
75 static const char name_s3c2443[] = "S3C2443";
76 static const char name_s3c2410a[] = "S3C2410A";
77 static const char name_s3c2440a[] = "S3C2440A";
79 static struct cpu_table cpu_ids[] __initdata = {
83 .map_io = s3c2410_map_io,
84 .init_clocks = s3c2410_init_clocks,
85 .init_uarts = s3c2410_init_uarts,
92 .map_io = s3c2410_map_io,
93 .init_clocks = s3c2410_init_clocks,
94 .init_uarts = s3c2410_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,
108 .idcode = 0x32440001,
109 .idmask = 0xffffffff,
110 .map_io = s3c244x_map_io,
111 .init_clocks = s3c244x_init_clocks,
112 .init_uarts = s3c244x_init_uarts,
113 .init = s3c2440_init,
114 .name = name_s3c2440a
117 .idcode = 0x32440aaa,
118 .idmask = 0xffffffff,
119 .map_io = s3c244x_map_io,
120 .init_clocks = s3c244x_init_clocks,
121 .init_uarts = s3c244x_init_uarts,
122 .init = s3c2442_init,
126 .idcode = 0x32412001,
127 .idmask = 0xffffffff,
128 .map_io = s3c2412_map_io,
129 .init_clocks = s3c2412_init_clocks,
130 .init_uarts = s3c2412_init_uarts,
131 .init = s3c2412_init,
132 .name = name_s3c2412,
134 { /* a newer version of the s3c2412 */
135 .idcode = 0x32412003,
136 .idmask = 0xffffffff,
137 .map_io = s3c2412_map_io,
138 .init_clocks = s3c2412_init_clocks,
139 .init_uarts = s3c2412_init_uarts,
140 .init = s3c2412_init,
141 .name = name_s3c2412,
144 .idcode = 0x32443001,
145 .idmask = 0xffffffff,
146 .map_io = s3c2443_map_io,
147 .init_clocks = s3c2443_init_clocks,
148 .init_uarts = s3c2443_init_uarts,
149 .init = s3c2443_init,
150 .name = name_s3c2443,
153 .idcode = 0x0, /* S3C2400 doesn't have an idcode */
154 .idmask = 0xffffffff,
155 .map_io = s3c2400_map_io,
156 .init_clocks = s3c2400_init_clocks,
157 .init_uarts = s3c2400_init_uarts,
158 .init = s3c2400_init,
163 /* minimal IO mapping */
165 static struct map_desc s3c_iodesc[] __initdata = {
172 static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode)
174 struct cpu_table *tab;
178 for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
179 if ((idcode & tab->idmask) == tab->idcode)
186 /* cpu information */
188 static struct cpu_table *cpu;
190 static unsigned long s3c24xx_read_idcode_v5(void)
192 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
193 return __raw_readl(S3C2412_GSTATUS1);
195 return 1UL; /* don't look like an 2400 */
199 static unsigned long s3c24xx_read_idcode_v4(void)
201 #ifndef CONFIG_CPU_S3C2400
202 return __raw_readl(S3C2410_GSTATUS1);
208 /* Hook for arm_pm_restart to ensure we execute the reset code
209 * with the caches enabled. It seems at least the S3C2440 has a problem
210 * resetting if there is bus activity interrupted by the reset.
212 static void s3c24xx_pm_restart(char mode)
217 local_irq_save(flags);
218 __cpuc_flush_kern_all();
219 __cpuc_flush_user_all();
222 local_irq_restore(flags);
225 /* fallback, or unhandled */
226 arm_machine_restart(mode);
229 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
231 unsigned long idcode = 0x0;
233 /* initialise the io descriptors we need for initialisation */
234 iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
236 if (cpu_architecture() >= CPU_ARCH_ARMv5) {
237 idcode = s3c24xx_read_idcode_v5();
239 idcode = s3c24xx_read_idcode_v4();
242 cpu = s3c_lookup_cpu(idcode);
245 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
246 panic("Unknown S3C24XX CPU");
249 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
251 if (cpu->map_io == NULL || cpu->init == NULL) {
252 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
253 panic("Unsupported S3C24XX CPU");
256 arm_pm_restart = s3c24xx_pm_restart;
258 (cpu->map_io)(mach_desc, size);
261 /* s3c24xx_init_clocks
263 * Initialise the clock subsystem and associated information from the
264 * given master crystal value.
266 * xtal = 0 -> use default PLL crystal value (normally 12MHz)
267 * != 0 -> PLL crystal value in Hz
270 void __init s3c24xx_init_clocks(int xtal)
276 panic("s3c24xx_init_clocks: no cpu setup?\n");
278 if (cpu->init_clocks == NULL)
279 panic("s3c24xx_init_clocks: cpu has no clock init\n");
281 (cpu->init_clocks)(xtal);
284 /* uart management */
286 static int nr_uarts __initdata = 0;
288 static struct s3c2410_uartcfg uart_cfgs[3];
290 /* s3c24xx_init_uartdevs
292 * copy the specified platform data and configuration into our central
293 * set of devices, before the data is thrown away after the init process.
295 * This also fills in the array passed to the serial driver for the
296 * early initialisation of the console.
299 void __init s3c24xx_init_uartdevs(char *name,
300 struct s3c24xx_uart_resources *res,
301 struct s3c2410_uartcfg *cfg, int no)
303 struct platform_device *platdev;
304 struct s3c2410_uartcfg *cfgptr = uart_cfgs;
305 struct s3c24xx_uart_resources *resp;
308 memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
310 for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
311 platdev = s3c24xx_uart_src[cfgptr->hwport];
313 resp = res + cfgptr->hwport;
315 s3c24xx_uart_devs[uart] = platdev;
317 platdev->name = name;
318 platdev->resource = resp->resources;
319 platdev->num_resources = resp->nr_resources;
321 platdev->dev.platform_data = cfgptr;
327 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
332 if (cpu->init_uarts == NULL) {
333 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
335 (cpu->init_uarts)(cfg, no);
338 static int __init s3c_arch_init(void)
342 // do the correct init for cpu
345 panic("s3c_arch_init: NULL cpu\n");
351 ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
355 arch_initcall(s3c_arch_init);