Merge branch 'linux-2.6'
[linux-2.6] / arch / arm / plat-s3c24xx / cpu.c
1 /* linux/arch/arm/plat-s3c24xx/cpu.c
2  *
3  * Copyright (c) 2004-2005 Simtec Electronics
4  *      http://www.simtec.co.uk/products/SWLINUX/
5  *      Ben Dooks <ben@simtec.co.uk>
6  *
7  * S3C24XX CPU Support
8  *
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.
13  *
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.
18  *
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
22 */
23
24
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
32 #include <asm/hardware.h>
33 #include <asm/irq.h>
34 #include <asm/io.h>
35 #include <asm/delay.h>
36
37 #include <asm/mach/arch.h>
38 #include <asm/mach/map.h>
39
40 #include <asm/arch/regs-gpio.h>
41 #include <asm/arch/regs-serial.h>
42
43 #include <asm/plat-s3c24xx/cpu.h>
44 #include <asm/plat-s3c24xx/devs.h>
45 #include <asm/plat-s3c24xx/clock.h>
46 #include <asm/plat-s3c24xx/s3c2400.h>
47 #include <asm/plat-s3c24xx/s3c2410.h>
48 #include <asm/plat-s3c24xx/s3c2412.h>
49 #include "s3c244x.h"
50 #include <asm/plat-s3c24xx/s3c2440.h>
51 #include <asm/plat-s3c24xx/s3c2442.h>
52 #include <asm/plat-s3c24xx/s3c2443.h>
53
54 struct cpu_table {
55         unsigned long   idcode;
56         unsigned long   idmask;
57         void            (*map_io)(struct map_desc *mach_desc, int size);
58         void            (*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
59         void            (*init_clocks)(int xtal);
60         int             (*init)(void);
61         const char      *name;
62 };
63
64 /* table of supported CPUs */
65
66 static const char name_s3c2400[]  = "S3C2400";
67 static const char name_s3c2410[]  = "S3C2410";
68 static const char name_s3c2412[]  = "S3C2412";
69 static const char name_s3c2440[]  = "S3C2440";
70 static const char name_s3c2442[]  = "S3C2442";
71 static const char name_s3c2443[]  = "S3C2443";
72 static const char name_s3c2410a[] = "S3C2410A";
73 static const char name_s3c2440a[] = "S3C2440A";
74
75 static struct cpu_table cpu_ids[] __initdata = {
76         {
77                 .idcode         = 0x32410000,
78                 .idmask         = 0xffffffff,
79                 .map_io         = s3c2410_map_io,
80                 .init_clocks    = s3c2410_init_clocks,
81                 .init_uarts     = s3c2410_init_uarts,
82                 .init           = s3c2410_init,
83                 .name           = name_s3c2410
84         },
85         {
86                 .idcode         = 0x32410002,
87                 .idmask         = 0xffffffff,
88                 .map_io         = s3c2410_map_io,
89                 .init_clocks    = s3c2410_init_clocks,
90                 .init_uarts     = s3c2410_init_uarts,
91                 .init           = s3c2410_init,
92                 .name           = name_s3c2410a
93         },
94         {
95                 .idcode         = 0x32440000,
96                 .idmask         = 0xffffffff,
97                 .map_io         = s3c244x_map_io,
98                 .init_clocks    = s3c244x_init_clocks,
99                 .init_uarts     = s3c244x_init_uarts,
100                 .init           = s3c2440_init,
101                 .name           = name_s3c2440
102         },
103         {
104                 .idcode         = 0x32440001,
105                 .idmask         = 0xffffffff,
106                 .map_io         = s3c244x_map_io,
107                 .init_clocks    = s3c244x_init_clocks,
108                 .init_uarts     = s3c244x_init_uarts,
109                 .init           = s3c2440_init,
110                 .name           = name_s3c2440a
111         },
112         {
113                 .idcode         = 0x32440aaa,
114                 .idmask         = 0xffffffff,
115                 .map_io         = s3c244x_map_io,
116                 .init_clocks    = s3c244x_init_clocks,
117                 .init_uarts     = s3c244x_init_uarts,
118                 .init           = s3c2442_init,
119                 .name           = name_s3c2442
120         },
121         {
122                 .idcode         = 0x32412001,
123                 .idmask         = 0xffffffff,
124                 .map_io         = s3c2412_map_io,
125                 .init_clocks    = s3c2412_init_clocks,
126                 .init_uarts     = s3c2412_init_uarts,
127                 .init           = s3c2412_init,
128                 .name           = name_s3c2412,
129         },
130         {                       /* a newer version of the s3c2412 */
131                 .idcode         = 0x32412003,
132                 .idmask         = 0xffffffff,
133                 .map_io         = s3c2412_map_io,
134                 .init_clocks    = s3c2412_init_clocks,
135                 .init_uarts     = s3c2412_init_uarts,
136                 .init           = s3c2412_init,
137                 .name           = name_s3c2412,
138         },
139         {
140                 .idcode         = 0x32443001,
141                 .idmask         = 0xffffffff,
142                 .map_io         = s3c2443_map_io,
143                 .init_clocks    = s3c2443_init_clocks,
144                 .init_uarts     = s3c2443_init_uarts,
145                 .init           = s3c2443_init,
146                 .name           = name_s3c2443,
147         },
148         {
149                 .idcode         = 0x0,   /* S3C2400 doesn't have an idcode */
150                 .idmask         = 0xffffffff,
151                 .map_io         = s3c2400_map_io,
152                 .init_clocks    = s3c2400_init_clocks,
153                 .init_uarts     = s3c2400_init_uarts,
154                 .init           = s3c2400_init,
155                 .name           = name_s3c2400
156         },
157 };
158
159 /* minimal IO mapping */
160
161 static struct map_desc s3c_iodesc[] __initdata = {
162         IODESC_ENT(GPIO),
163         IODESC_ENT(IRQ),
164         IODESC_ENT(MEMCTRL),
165         IODESC_ENT(UART)
166 };
167
168
169 static struct cpu_table *
170 s3c_lookup_cpu(unsigned long idcode)
171 {
172         struct cpu_table *tab;
173         int count;
174
175         tab = cpu_ids;
176         for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
177                 if ((idcode & tab->idmask) == tab->idcode)
178                         return tab;
179         }
180
181         return NULL;
182 }
183
184 /* cpu information */
185
186 static struct cpu_table *cpu;
187
188 static unsigned long s3c24xx_read_idcode_v5(void)
189 {
190 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
191         return __raw_readl(S3C2412_GSTATUS1);
192 #else
193         return 1UL;     /* don't look like an 2400 */
194 #endif
195 }
196
197 static unsigned long s3c24xx_read_idcode_v4(void)
198 {
199 #ifndef CONFIG_CPU_S3C2400
200         return __raw_readl(S3C2410_GSTATUS1);
201 #else
202         return 0UL;
203 #endif
204 }
205
206 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
207 {
208         unsigned long idcode = 0x0;
209
210         /* initialise the io descriptors we need for initialisation */
211         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
212
213         if (cpu_architecture() >= CPU_ARCH_ARMv5) {
214                 idcode = s3c24xx_read_idcode_v5();
215         } else {
216                 idcode = s3c24xx_read_idcode_v4();
217         }
218
219         cpu = s3c_lookup_cpu(idcode);
220
221         if (cpu == NULL) {
222                 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
223                 panic("Unknown S3C24XX CPU");
224         }
225
226         printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);
227
228         if (cpu->map_io == NULL || cpu->init == NULL) {
229                 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
230                 panic("Unsupported S3C24XX CPU");
231         }
232
233         (cpu->map_io)(mach_desc, size);
234 }
235
236 /* s3c24xx_init_clocks
237  *
238  * Initialise the clock subsystem and associated information from the
239  * given master crystal value.
240  *
241  * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
242  *      != 0 -> PLL crystal value in Hz
243 */
244
245 void __init s3c24xx_init_clocks(int xtal)
246 {
247         if (xtal == 0)
248                 xtal = 12*1000*1000;
249
250         if (cpu == NULL)
251                 panic("s3c24xx_init_clocks: no cpu setup?\n");
252
253         if (cpu->init_clocks == NULL)
254                 panic("s3c24xx_init_clocks: cpu has no clock init\n");
255         else
256                 (cpu->init_clocks)(xtal);
257 }
258
259 /* uart management */
260
261 static int nr_uarts __initdata = 0;
262
263 static struct s3c2410_uartcfg uart_cfgs[3];
264
265 /* s3c24xx_init_uartdevs
266  *
267  * copy the specified platform data and configuration into our central
268  * set of devices, before the data is thrown away after the init process.
269  *
270  * This also fills in the array passed to the serial driver for the
271  * early initialisation of the console.
272 */
273
274 void __init s3c24xx_init_uartdevs(char *name,
275                                   struct s3c24xx_uart_resources *res,
276                                   struct s3c2410_uartcfg *cfg, int no)
277 {
278         struct platform_device *platdev;
279         struct s3c2410_uartcfg *cfgptr = uart_cfgs;
280         struct s3c24xx_uart_resources *resp;
281         int uart;
282
283         memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
284
285         for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
286                 platdev = s3c24xx_uart_src[cfgptr->hwport];
287
288                 resp = res + cfgptr->hwport;
289
290                 s3c24xx_uart_devs[uart] = platdev;
291
292                 platdev->name = name;
293                 platdev->resource = resp->resources;
294                 platdev->num_resources = resp->nr_resources;
295
296                 platdev->dev.platform_data = cfgptr;
297         }
298
299         nr_uarts = no;
300 }
301
302 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
303 {
304         if (cpu == NULL)
305                 return;
306
307         if (cpu->init_uarts == NULL) {
308                 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
309         } else
310                 (cpu->init_uarts)(cfg, no);
311 }
312
313 static int __init s3c_arch_init(void)
314 {
315         int ret;
316
317         // do the correct init for cpu
318
319         if (cpu == NULL)
320                 panic("s3c_arch_init: NULL cpu\n");
321
322         ret = (cpu->init)();
323         if (ret != 0)
324                 return ret;
325
326         ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
327         return ret;
328 }
329
330 arch_initcall(s3c_arch_init);