cpu.c 7.8 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
/* linux/arch/arm/mach-s3c2410/cpu.c
 *
 * Copyright (c) 2004-2005 Simtec Electronics
 *	http://www.simtec.co.uk/products/SWLINUX/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C24XX CPU Support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
29
#include <linux/platform_device.h>
Linus Torvalds's avatar
Linus Torvalds committed
30 31 32 33 34 35 36 37 38 39

#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/delay.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include <asm/arch/regs-gpio.h>
40
#include <asm/arch/regs-serial.h>
Linus Torvalds's avatar
Linus Torvalds committed
41 42

#include "cpu.h"
43
#include "devs.h"
Linus Torvalds's avatar
Linus Torvalds committed
44
#include "clock.h"
45
#include "s3c2400.h"
Linus Torvalds's avatar
Linus Torvalds committed
46
#include "s3c2410.h"
47
#include "s3c2412.h"
48
#include "s3c244x.h"
Linus Torvalds's avatar
Linus Torvalds committed
49
#include "s3c2440.h"
50
#include "s3c2442.h"
Linus Torvalds's avatar
Linus Torvalds committed
51 52 53 54 55 56 57 58 59 60 61 62 63

struct cpu_table {
	unsigned long	idcode;
	unsigned long	idmask;
	void		(*map_io)(struct map_desc *mach_desc, int size);
	void		(*init_uarts)(struct s3c2410_uartcfg *cfg, int no);
	void		(*init_clocks)(int xtal);
	int		(*init)(void);
	const char	*name;
};

/* table of supported CPUs */

64
static const char name_s3c2400[]  = "S3C2400";
Linus Torvalds's avatar
Linus Torvalds committed
65
static const char name_s3c2410[]  = "S3C2410";
66
static const char name_s3c2412[]  = "S3C2412";
Linus Torvalds's avatar
Linus Torvalds committed
67
static const char name_s3c2440[]  = "S3C2440";
68
static const char name_s3c2442[]  = "S3C2442";
Linus Torvalds's avatar
Linus Torvalds committed
69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
static const char name_s3c2410a[] = "S3C2410A";
static const char name_s3c2440a[] = "S3C2440A";

static struct cpu_table cpu_ids[] __initdata = {
	{
		.idcode		= 0x32410000,
		.idmask		= 0xffffffff,
		.map_io		= s3c2410_map_io,
		.init_clocks	= s3c2410_init_clocks,
		.init_uarts	= s3c2410_init_uarts,
		.init		= s3c2410_init,
		.name		= name_s3c2410
	},
	{
		.idcode		= 0x32410002,
		.idmask		= 0xffffffff,
		.map_io		= s3c2410_map_io,
		.init_clocks	= s3c2410_init_clocks,
		.init_uarts	= s3c2410_init_uarts,
		.init		= s3c2410_init,
		.name		= name_s3c2410a
	},
	{
		.idcode		= 0x32440000,
		.idmask		= 0xffffffff,
94 95 96
		.map_io		= s3c244x_map_io,
		.init_clocks	= s3c244x_init_clocks,
		.init_uarts	= s3c244x_init_uarts,
Linus Torvalds's avatar
Linus Torvalds committed
97 98 99 100 101 102
		.init		= s3c2440_init,
		.name		= name_s3c2440
	},
	{
		.idcode		= 0x32440001,
		.idmask		= 0xffffffff,
103 104 105
		.map_io		= s3c244x_map_io,
		.init_clocks	= s3c244x_init_clocks,
		.init_uarts	= s3c244x_init_uarts,
Linus Torvalds's avatar
Linus Torvalds committed
106 107
		.init		= s3c2440_init,
		.name		= name_s3c2440a
108
	},
109 110 111 112 113 114 115 116 117
	{
		.idcode		= 0x32440aaa,
		.idmask		= 0xffffffff,
		.map_io		= s3c244x_map_io,
		.init_clocks	= s3c244x_init_clocks,
		.init_uarts	= s3c244x_init_uarts,
		.init		= s3c2442_init,
		.name		= name_s3c2442
	},
118 119 120 121 122 123 124 125 126
	{
		.idcode		= 0x32412001,
		.idmask		= 0xffffffff,
		.map_io		= s3c2412_map_io,
		.init_clocks	= s3c2412_init_clocks,
		.init_uarts	= s3c2412_init_uarts,
		.init		= s3c2412_init,
		.name		= name_s3c2412,
	},
127 128 129 130 131 132 133 134 135
	{
		.idcode		= 0x0,   /* S3C2400 doesn't have an idcode */
		.idmask		= 0xffffffff,
		.map_io		= s3c2400_map_io,
		.init_clocks	= s3c2400_init_clocks,
		.init_uarts	= s3c2400_init_uarts,
		.init		= s3c2400_init,
		.name		= name_s3c2400
	},
Linus Torvalds's avatar
Linus Torvalds committed
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173
};

/* minimal IO mapping */

static struct map_desc s3c_iodesc[] __initdata = {
	IODESC_ENT(GPIO),
	IODESC_ENT(IRQ),
	IODESC_ENT(MEMCTRL),
	IODESC_ENT(UART)
};


static struct cpu_table *
s3c_lookup_cpu(unsigned long idcode)
{
	struct cpu_table *tab;
	int count;

	tab = cpu_ids;
	for (count = 0; count < ARRAY_SIZE(cpu_ids); count++, tab++) {
		if ((idcode & tab->idmask) == tab->idcode)
			return tab;
	}

	return NULL;
}

/* board information */

static struct s3c24xx_board *board;

void s3c24xx_set_board(struct s3c24xx_board *b)
{
	int i;

	board = b;

	if (b->clocks_count != 0) {
Alexey Dobriyan's avatar
Alexey Dobriyan committed
174
		struct clk **ptr = b->clocks;
Linus Torvalds's avatar
Linus Torvalds committed
175 176 177 178 179 180 181 182 183 184

		for (i = b->clocks_count; i > 0; i--, ptr++)
			s3c24xx_register_clock(*ptr);
	}
}

/* cpu information */

static struct cpu_table *cpu;

185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
static unsigned long s3c24xx_read_idcode_v5(void)
{
#if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
	return __raw_readl(S3C2412_GSTATUS1);
#else
	return 1UL;	/* don't look like an 2400 */
#endif
}

static unsigned long s3c24xx_read_idcode_v4(void)
{
#ifndef CONFIG_CPU_S3C2400
	return __raw_readl(S3C2410_GSTATUS1);
#else
	return 0UL;
#endif
}

Linus Torvalds's avatar
Linus Torvalds committed
203 204
void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
{
205
	unsigned long idcode = 0x0;
Linus Torvalds's avatar
Linus Torvalds committed
206 207 208 209

	/* initialise the io descriptors we need for initialisation */
	iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));

210 211 212 213 214
	if (cpu_architecture() >= CPU_ARCH_ARMv5) {
		idcode = s3c24xx_read_idcode_v5();
	} else {
		idcode = s3c24xx_read_idcode_v4();
	}
215

Linus Torvalds's avatar
Linus Torvalds committed
216 217 218 219 220 221 222
	cpu = s3c_lookup_cpu(idcode);

	if (cpu == NULL) {
		printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode);
		panic("Unknown S3C24XX CPU");
	}

223 224
	printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode);

Linus Torvalds's avatar
Linus Torvalds committed
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
	if (cpu->map_io == NULL || cpu->init == NULL) {
		printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
		panic("Unsupported S3C24XX CPU");
	}

	(cpu->map_io)(mach_desc, size);
}

/* s3c24xx_init_clocks
 *
 * Initialise the clock subsystem and associated information from the
 * given master crystal value.
 *
 * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
 *      != 0 -> PLL crystal value in Hz
*/

void __init s3c24xx_init_clocks(int xtal)
{
	if (xtal == 0)
		xtal = 12*1000*1000;

	if (cpu == NULL)
		panic("s3c24xx_init_clocks: no cpu setup?\n");

	if (cpu->init_clocks == NULL)
		panic("s3c24xx_init_clocks: cpu has no clock init\n");
	else
		(cpu->init_clocks)(xtal);
}

256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
/* uart management */

static int nr_uarts __initdata = 0;

static struct s3c2410_uartcfg uart_cfgs[3];

/* s3c24xx_init_uartdevs
 *
 * copy the specified platform data and configuration into our central
 * set of devices, before the data is thrown away after the init process.
 *
 * This also fills in the array passed to the serial driver for the
 * early initialisation of the console.
*/

void __init s3c24xx_init_uartdevs(char *name,
				  struct s3c24xx_uart_resources *res,
				  struct s3c2410_uartcfg *cfg, int no)
{
	struct platform_device *platdev;
	struct s3c2410_uartcfg *cfgptr = uart_cfgs;
	struct s3c24xx_uart_resources *resp;
	int uart;

	memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);

	for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
		platdev = s3c24xx_uart_src[cfgptr->hwport];

		resp = res + cfgptr->hwport;

		s3c24xx_uart_devs[uart] = platdev;

		platdev->name = name;
		platdev->resource = resp->resources;
		platdev->num_resources = resp->nr_resources;

		platdev->dev.platform_data = cfgptr;
	}

	nr_uarts = no;
}

Linus Torvalds's avatar
Linus Torvalds committed
299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322
void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
	if (cpu == NULL)
		return;

	if (cpu->init_uarts == NULL) {
		printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
	} else
		(cpu->init_uarts)(cfg, no);
}

static int __init s3c_arch_init(void)
{
	int ret;

	// do the correct init for cpu

	if (cpu == NULL)
		panic("s3c_arch_init: NULL cpu\n");

	ret = (cpu->init)();
	if (ret != 0)
		return ret;

323 324 325 326
	ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
	if (ret != 0)
		return ret;

Linus Torvalds's avatar
Linus Torvalds committed
327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347
	if (board != NULL) {
		struct platform_device **ptr = board->devices;
		int i;

		for (i = 0; i < board->devices_count; i++, ptr++) {
			ret = platform_device_register(*ptr);

			if (ret) {
				printk(KERN_ERR "s3c24xx: failed to add board device %s (%d) @%p\n", (*ptr)->name, ret, *ptr);
			}
		}

		/* mask any error, we may not need all these board
		 * devices */
		ret = 0;
	}

	return ret;
}

arch_initcall(s3c_arch_init);