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>
34 #include <mach/hardware.h>
36 #include <asm/cacheflush.h>
38 #include <asm/mach/arch.h>
39 #include <asm/mach/map.h>
41 #include <mach/system-reset.h>
43 #include <mach/regs-gpio.h>
44 #include <plat/regs-serial.h>
47 #include <plat/devs.h>
48 #include <plat/clock.h>
49 #include <plat/s3c2400.h>
50 #include <plat/s3c2410.h>
51 #include <plat/s3c2412.h>
53 #include <plat/s3c2440.h>
54 #include <plat/s3c2442.h>
55 #include <plat/s3c2443.h>
57 /* table of supported CPUs */
59 static const char name_s3c2400
[] = "S3C2400";
60 static const char name_s3c2410
[] = "S3C2410";
61 static const char name_s3c2412
[] = "S3C2412";
62 static const char name_s3c2440
[] = "S3C2440";
63 static const char name_s3c2442
[] = "S3C2442";
64 static const char name_s3c2443
[] = "S3C2443";
65 static const char name_s3c2410a
[] = "S3C2410A";
66 static const char name_s3c2440a
[] = "S3C2440A";
68 static struct cpu_table cpu_ids
[] __initdata
= {
72 .map_io
= s3c2410_map_io
,
73 .init_clocks
= s3c2410_init_clocks
,
74 .init_uarts
= s3c2410_init_uarts
,
81 .map_io
= s3c2410_map_io
,
82 .init_clocks
= s3c2410_init_clocks
,
83 .init_uarts
= s3c2410_init_uarts
,
90 .map_io
= s3c244x_map_io
,
91 .init_clocks
= s3c244x_init_clocks
,
92 .init_uarts
= s3c244x_init_uarts
,
99 .map_io
= s3c244x_map_io
,
100 .init_clocks
= s3c244x_init_clocks
,
101 .init_uarts
= s3c244x_init_uarts
,
102 .init
= s3c2440_init
,
103 .name
= name_s3c2440a
106 .idcode
= 0x32440aaa,
107 .idmask
= 0xffffffff,
108 .map_io
= s3c244x_map_io
,
109 .init_clocks
= s3c244x_init_clocks
,
110 .init_uarts
= s3c244x_init_uarts
,
111 .init
= s3c2442_init
,
115 .idcode
= 0x32412001,
116 .idmask
= 0xffffffff,
117 .map_io
= s3c2412_map_io
,
118 .init_clocks
= s3c2412_init_clocks
,
119 .init_uarts
= s3c2412_init_uarts
,
120 .init
= s3c2412_init
,
121 .name
= name_s3c2412
,
123 { /* a newer version of the s3c2412 */
124 .idcode
= 0x32412003,
125 .idmask
= 0xffffffff,
126 .map_io
= s3c2412_map_io
,
127 .init_clocks
= s3c2412_init_clocks
,
128 .init_uarts
= s3c2412_init_uarts
,
129 .init
= s3c2412_init
,
130 .name
= name_s3c2412
,
133 .idcode
= 0x32443001,
134 .idmask
= 0xffffffff,
135 .map_io
= s3c2443_map_io
,
136 .init_clocks
= s3c2443_init_clocks
,
137 .init_uarts
= s3c2443_init_uarts
,
138 .init
= s3c2443_init
,
139 .name
= name_s3c2443
,
142 .idcode
= 0x0, /* S3C2400 doesn't have an idcode */
143 .idmask
= 0xffffffff,
144 .map_io
= s3c2400_map_io
,
145 .init_clocks
= s3c2400_init_clocks
,
146 .init_uarts
= s3c2400_init_uarts
,
147 .init
= s3c2400_init
,
152 /* minimal IO mapping */
154 static struct map_desc s3c_iodesc
[] __initdata
= {
161 /* read cpu identificaiton code */
163 static unsigned long s3c24xx_read_idcode_v5(void)
165 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
166 return __raw_readl(S3C2412_GSTATUS1
);
168 return 1UL; /* don't look like an 2400 */
172 static unsigned long s3c24xx_read_idcode_v4(void)
174 #ifndef CONFIG_CPU_S3C2400
175 return __raw_readl(S3C2410_GSTATUS1
);
181 /* Hook for arm_pm_restart to ensure we execute the reset code
182 * with the caches enabled. It seems at least the S3C2440 has a problem
183 * resetting if there is bus activity interrupted by the reset.
185 static void s3c24xx_pm_restart(char mode
, const char *cmd
)
190 local_irq_save(flags
);
191 __cpuc_flush_kern_all();
192 __cpuc_flush_user_all();
194 arch_reset(mode
, cmd
);
195 local_irq_restore(flags
);
198 /* fallback, or unhandled */
199 arm_machine_restart(mode
, cmd
);
202 void __init
s3c24xx_init_io(struct map_desc
*mach_desc
, int size
)
204 unsigned long idcode
= 0x0;
206 /* initialise the io descriptors we need for initialisation */
207 iotable_init(mach_desc
, size
);
208 iotable_init(s3c_iodesc
, ARRAY_SIZE(s3c_iodesc
));
210 if (cpu_architecture() >= CPU_ARCH_ARMv5
) {
211 idcode
= s3c24xx_read_idcode_v5();
213 idcode
= s3c24xx_read_idcode_v4();
216 arm_pm_restart
= s3c24xx_pm_restart
;
218 s3c_init_cpu(idcode
, cpu_ids
, ARRAY_SIZE(cpu_ids
));