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a21765a7 | 1 | /* linux/arch/arm/plat-s3c24xx/cpu.c |
1da177e4 LT |
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> | |
b6d1f542 | 29 | #include <linux/serial_core.h> |
d052d1be | 30 | #include <linux/platform_device.h> |
3c7d9c81 | 31 | #include <linux/delay.h> |
1da177e4 | 32 | |
a09e64fb | 33 | #include <mach/hardware.h> |
1da177e4 LT |
34 | #include <asm/irq.h> |
35 | #include <asm/io.h> | |
36 | #include <asm/delay.h> | |
3c7d9c81 | 37 | #include <asm/cacheflush.h> |
1da177e4 LT |
38 | |
39 | #include <asm/mach/arch.h> | |
40 | #include <asm/mach/map.h> | |
41 | ||
a09e64fb | 42 | #include <mach/system-reset.h> |
3c7d9c81 | 43 | |
a09e64fb | 44 | #include <mach/regs-gpio.h> |
531b617c | 45 | #include <asm/plat-s3c/regs-serial.h> |
1da177e4 | 46 | |
a21765a7 BD |
47 | #include <asm/plat-s3c24xx/cpu.h> |
48 | #include <asm/plat-s3c24xx/devs.h> | |
49 | #include <asm/plat-s3c24xx/clock.h> | |
50 | #include <asm/plat-s3c24xx/s3c2400.h> | |
51 | #include <asm/plat-s3c24xx/s3c2410.h> | |
52 | #include <asm/plat-s3c24xx/s3c2412.h> | |
96ce2385 | 53 | #include "s3c244x.h" |
a21765a7 BD |
54 | #include <asm/plat-s3c24xx/s3c2440.h> |
55 | #include <asm/plat-s3c24xx/s3c2442.h> | |
e4d06e39 | 56 | #include <asm/plat-s3c24xx/s3c2443.h> |
1da177e4 LT |
57 | |
58 | struct cpu_table { | |
59 | unsigned long idcode; | |
60 | unsigned long idmask; | |
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); | |
64 | int (*init)(void); | |
65 | const char *name; | |
66 | }; | |
67 | ||
68 | /* table of supported CPUs */ | |
69 | ||
83f755f5 | 70 | static const char name_s3c2400[] = "S3C2400"; |
1da177e4 | 71 | static const char name_s3c2410[] = "S3C2410"; |
68d9ab39 | 72 | static const char name_s3c2412[] = "S3C2412"; |
1da177e4 | 73 | static const char name_s3c2440[] = "S3C2440"; |
96ce2385 | 74 | static const char name_s3c2442[] = "S3C2442"; |
e4d06e39 | 75 | static const char name_s3c2443[] = "S3C2443"; |
1da177e4 LT |
76 | static const char name_s3c2410a[] = "S3C2410A"; |
77 | static const char name_s3c2440a[] = "S3C2440A"; | |
78 | ||
79 | static struct cpu_table cpu_ids[] __initdata = { | |
80 | { | |
81 | .idcode = 0x32410000, | |
82 | .idmask = 0xffffffff, | |
83 | .map_io = s3c2410_map_io, | |
84 | .init_clocks = s3c2410_init_clocks, | |
85 | .init_uarts = s3c2410_init_uarts, | |
86 | .init = s3c2410_init, | |
87 | .name = name_s3c2410 | |
88 | }, | |
89 | { | |
90 | .idcode = 0x32410002, | |
91 | .idmask = 0xffffffff, | |
92 | .map_io = s3c2410_map_io, | |
93 | .init_clocks = s3c2410_init_clocks, | |
94 | .init_uarts = s3c2410_init_uarts, | |
95 | .init = s3c2410_init, | |
96 | .name = name_s3c2410a | |
97 | }, | |
98 | { | |
99 | .idcode = 0x32440000, | |
100 | .idmask = 0xffffffff, | |
96ce2385 BD |
101 | .map_io = s3c244x_map_io, |
102 | .init_clocks = s3c244x_init_clocks, | |
103 | .init_uarts = s3c244x_init_uarts, | |
1da177e4 LT |
104 | .init = s3c2440_init, |
105 | .name = name_s3c2440 | |
106 | }, | |
107 | { | |
108 | .idcode = 0x32440001, | |
109 | .idmask = 0xffffffff, | |
96ce2385 BD |
110 | .map_io = s3c244x_map_io, |
111 | .init_clocks = s3c244x_init_clocks, | |
112 | .init_uarts = s3c244x_init_uarts, | |
1da177e4 LT |
113 | .init = s3c2440_init, |
114 | .name = name_s3c2440a | |
83f755f5 | 115 | }, |
96ce2385 BD |
116 | { |
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, | |
123 | .name = name_s3c2442 | |
124 | }, | |
68d9ab39 BD |
125 | { |
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, | |
133 | }, | |
d9bc55fa BD |
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, | |
142 | }, | |
e4d06e39 BD |
143 | { |
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, | |
151 | }, | |
83f755f5 LCVR |
152 | { |
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, | |
159 | .name = name_s3c2400 | |
160 | }, | |
1da177e4 LT |
161 | }; |
162 | ||
163 | /* minimal IO mapping */ | |
164 | ||
165 | static struct map_desc s3c_iodesc[] __initdata = { | |
166 | IODESC_ENT(GPIO), | |
167 | IODESC_ENT(IRQ), | |
168 | IODESC_ENT(MEMCTRL), | |
169 | IODESC_ENT(UART) | |
170 | }; | |
171 | ||
172 | ||
173 | static struct cpu_table * | |
174 | s3c_lookup_cpu(unsigned long idcode) | |
175 | { | |
176 | struct cpu_table *tab; | |
177 | int count; | |
178 | ||
179 | tab = cpu_ids; | |
180 | for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) { | |
181 | if ((idcode & tab->idmask) == tab->idcode) | |
182 | return tab; | |
183 | } | |
184 | ||
185 | return NULL; | |
186 | } | |
187 | ||
1da177e4 LT |
188 | /* cpu information */ |
189 | ||
190 | static struct cpu_table *cpu; | |
191 | ||
68d9ab39 BD |
192 | static unsigned long s3c24xx_read_idcode_v5(void) |
193 | { | |
194 | #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413) | |
195 | return __raw_readl(S3C2412_GSTATUS1); | |
196 | #else | |
197 | return 1UL; /* don't look like an 2400 */ | |
198 | #endif | |
199 | } | |
200 | ||
201 | static unsigned long s3c24xx_read_idcode_v4(void) | |
202 | { | |
203 | #ifndef CONFIG_CPU_S3C2400 | |
204 | return __raw_readl(S3C2410_GSTATUS1); | |
205 | #else | |
206 | return 0UL; | |
207 | #endif | |
208 | } | |
209 | ||
3c7d9c81 BD |
210 | /* Hook for arm_pm_restart to ensure we execute the reset code |
211 | * with the caches enabled. It seems at least the S3C2440 has a problem | |
212 | * resetting if there is bus activity interrupted by the reset. | |
213 | */ | |
214 | static void s3c24xx_pm_restart(char mode) | |
215 | { | |
216 | if (mode != 's') { | |
217 | unsigned long flags; | |
218 | ||
219 | local_irq_save(flags); | |
220 | __cpuc_flush_kern_all(); | |
221 | __cpuc_flush_user_all(); | |
222 | ||
223 | arch_reset(mode); | |
224 | local_irq_restore(flags); | |
225 | } | |
226 | ||
227 | /* fallback, or unhandled */ | |
228 | arm_machine_restart(mode); | |
229 | } | |
230 | ||
1da177e4 LT |
231 | void __init s3c24xx_init_io(struct map_desc *mach_desc, int size) |
232 | { | |
83f755f5 | 233 | unsigned long idcode = 0x0; |
1da177e4 LT |
234 | |
235 | /* initialise the io descriptors we need for initialisation */ | |
236 | iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc)); | |
237 | ||
68d9ab39 BD |
238 | if (cpu_architecture() >= CPU_ARCH_ARMv5) { |
239 | idcode = s3c24xx_read_idcode_v5(); | |
240 | } else { | |
241 | idcode = s3c24xx_read_idcode_v4(); | |
242 | } | |
83f755f5 | 243 | |
1da177e4 LT |
244 | cpu = s3c_lookup_cpu(idcode); |
245 | ||
246 | if (cpu == NULL) { | |
247 | printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode); | |
248 | panic("Unknown S3C24XX CPU"); | |
249 | } | |
250 | ||
36fe6a83 BD |
251 | printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode); |
252 | ||
1da177e4 LT |
253 | if (cpu->map_io == NULL || cpu->init == NULL) { |
254 | printk(KERN_ERR "CPU %s support not enabled\n", cpu->name); | |
255 | panic("Unsupported S3C24XX CPU"); | |
256 | } | |
257 | ||
3c7d9c81 BD |
258 | arm_pm_restart = s3c24xx_pm_restart; |
259 | ||
1da177e4 LT |
260 | (cpu->map_io)(mach_desc, size); |
261 | } | |
262 | ||
263 | /* s3c24xx_init_clocks | |
264 | * | |
265 | * Initialise the clock subsystem and associated information from the | |
266 | * given master crystal value. | |
267 | * | |
268 | * xtal = 0 -> use default PLL crystal value (normally 12MHz) | |
269 | * != 0 -> PLL crystal value in Hz | |
270 | */ | |
271 | ||
272 | void __init s3c24xx_init_clocks(int xtal) | |
273 | { | |
274 | if (xtal == 0) | |
275 | xtal = 12*1000*1000; | |
276 | ||
277 | if (cpu == NULL) | |
278 | panic("s3c24xx_init_clocks: no cpu setup?\n"); | |
279 | ||
280 | if (cpu->init_clocks == NULL) | |
281 | panic("s3c24xx_init_clocks: cpu has no clock init\n"); | |
282 | else | |
283 | (cpu->init_clocks)(xtal); | |
284 | } | |
285 | ||
66a9b49a BD |
286 | /* uart management */ |
287 | ||
288 | static int nr_uarts __initdata = 0; | |
289 | ||
290 | static struct s3c2410_uartcfg uart_cfgs[3]; | |
291 | ||
292 | /* s3c24xx_init_uartdevs | |
293 | * | |
294 | * copy the specified platform data and configuration into our central | |
295 | * set of devices, before the data is thrown away after the init process. | |
296 | * | |
297 | * This also fills in the array passed to the serial driver for the | |
298 | * early initialisation of the console. | |
299 | */ | |
300 | ||
301 | void __init s3c24xx_init_uartdevs(char *name, | |
302 | struct s3c24xx_uart_resources *res, | |
303 | struct s3c2410_uartcfg *cfg, int no) | |
304 | { | |
305 | struct platform_device *platdev; | |
306 | struct s3c2410_uartcfg *cfgptr = uart_cfgs; | |
307 | struct s3c24xx_uart_resources *resp; | |
308 | int uart; | |
309 | ||
310 | memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no); | |
311 | ||
312 | for (uart = 0; uart < no; uart++, cfg++, cfgptr++) { | |
313 | platdev = s3c24xx_uart_src[cfgptr->hwport]; | |
314 | ||
315 | resp = res + cfgptr->hwport; | |
316 | ||
317 | s3c24xx_uart_devs[uart] = platdev; | |
318 | ||
319 | platdev->name = name; | |
320 | platdev->resource = resp->resources; | |
321 | platdev->num_resources = resp->nr_resources; | |
322 | ||
323 | platdev->dev.platform_data = cfgptr; | |
324 | } | |
325 | ||
326 | nr_uarts = no; | |
327 | } | |
328 | ||
1da177e4 LT |
329 | void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no) |
330 | { | |
331 | if (cpu == NULL) | |
332 | return; | |
333 | ||
334 | if (cpu->init_uarts == NULL) { | |
335 | printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n"); | |
336 | } else | |
337 | (cpu->init_uarts)(cfg, no); | |
338 | } | |
339 | ||
340 | static int __init s3c_arch_init(void) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | // do the correct init for cpu | |
345 | ||
346 | if (cpu == NULL) | |
347 | panic("s3c_arch_init: NULL cpu\n"); | |
348 | ||
349 | ret = (cpu->init)(); | |
350 | if (ret != 0) | |
351 | return ret; | |
352 | ||
66a9b49a | 353 | ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts); |
1da177e4 LT |
354 | return ret; |
355 | } | |
356 | ||
357 | arch_initcall(s3c_arch_init); |