arch/arm/mach-s3c24xx/common.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  * Common code for S3C24XX machines
   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 #include <linux/delay.h>
  32 #include <linux/io.h>
  33
  34 #include <mach/hardware.h>
  35 #include <mach/regs-clock.h>
  36 #include <asm/irq.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/system_info.h>
  39 #include <asm/system_misc.h>
  40
  41 #include <asm/mach/arch.h>
  42 #include <asm/mach/map.h>
  43
  44 #include <mach/regs-gpio.h>
  45 #include <plat/regs-serial.h>
  46
  47 #include <plat/cpu.h>
  48 #include <plat/devs.h>
  49 #include <plat/clock.h>
  50 #include <plat/s3c2410.h>
  51 #include <plat/s3c2412.h>
  52 #include <plat/s3c2416.h>
  53 #include <plat/s3c244x.h>
  54 #include <plat/s3c2443.h>
  55 #include <plat/cpu-freq.h>
  56 #include <plat/pll.h>
  57
  58 /* table of supported CPUs */
  59
  60 static const char name_s3c2410[]  = "S3C2410";
  61 static const char name_s3c2412[]  = "S3C2412";
  62 static const char name_s3c2416[]  = "S3C2416/S3C2450";
  63 static const char name_s3c2440[]  = "S3C2440";
  64 static const char name_s3c2442[]  = "S3C2442";
  65 static const char name_s3c2442b[]  = "S3C2442B";
  66 static const char name_s3c2443[]  = "S3C2443";
  67 static const char name_s3c2410a[] = "S3C2410A";
  68 static const char name_s3c2440a[] = "S3C2440A";
  69
  70 static struct cpu_table cpu_ids[] __initdata = {
  71         {
  72                 .idcode         = 0x32410000,
  73                 .idmask         = 0xffffffff,
  74                 .map_io         = s3c2410_map_io,
  75                 .init_clocks    = s3c2410_init_clocks,
  76                 .init_uarts     = s3c2410_init_uarts,
  77                 .init           = s3c2410_init,
  78                 .name           = name_s3c2410
  79         },
  80         {
  81                 .idcode         = 0x32410002,
  82                 .idmask         = 0xffffffff,
  83                 .map_io         = s3c2410_map_io,
  84                 .init_clocks    = s3c2410_init_clocks,
  85                 .init_uarts     = s3c2410_init_uarts,
  86                 .init           = s3c2410a_init,
  87                 .name           = name_s3c2410a
  88         },
  89         {
  90                 .idcode         = 0x32440000,
  91                 .idmask         = 0xffffffff,
  92                 .map_io         = s3c2440_map_io,
  93                 .init_clocks    = s3c244x_init_clocks,
  94                 .init_uarts     = s3c244x_init_uarts,
  95                 .init           = s3c2440_init,
  96                 .name           = name_s3c2440
  97         },
  98         {
  99                 .idcode         = 0x32440001,
 100                 .idmask         = 0xffffffff,
 101                 .map_io         = s3c2440_map_io,
 102                 .init_clocks    = s3c244x_init_clocks,
 103                 .init_uarts     = s3c244x_init_uarts,
 104                 .init           = s3c2440_init,
 105                 .name           = name_s3c2440a
 106         },
 107         {
 108                 .idcode         = 0x32440aaa,
 109                 .idmask         = 0xffffffff,
 110                 .map_io         = s3c2442_map_io,
 111                 .init_clocks    = s3c244x_init_clocks,
 112                 .init_uarts     = s3c244x_init_uarts,
 113                 .init           = s3c2442_init,
 114                 .name           = name_s3c2442
 115         },
 116         {
 117                 .idcode         = 0x32440aab,
 118                 .idmask         = 0xffffffff,
 119                 .map_io         = s3c2442_map_io,
 120                 .init_clocks    = s3c244x_init_clocks,
 121                 .init_uarts     = s3c244x_init_uarts,
 122                 .init           = s3c2442_init,
 123                 .name           = name_s3c2442b
 124         },
 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         },
 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         },
 143         {                       /* a strange version of the s3c2416 */
 144                 .idcode         = 0x32450003,
 145                 .idmask         = 0xffffffff,
 146                 .map_io         = s3c2416_map_io,
 147                 .init_clocks    = s3c2416_init_clocks,
 148                 .init_uarts     = s3c2416_init_uarts,
 149                 .init           = s3c2416_init,
 150                 .name           = name_s3c2416,
 151         },
 152         {
 153                 .idcode         = 0x32443001,
 154                 .idmask         = 0xffffffff,
 155                 .map_io         = s3c2443_map_io,
 156                 .init_clocks    = s3c2443_init_clocks,
 157                 .init_uarts     = s3c2443_init_uarts,
 158                 .init           = s3c2443_init,
 159                 .name           = name_s3c2443,
 160         },
 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 /* read cpu identificaiton code */
 173
 174 static unsigned long s3c24xx_read_idcode_v5(void)
 175 {
 176 #if defined(CONFIG_CPU_S3C2416)
 177         /* s3c2416 is v5, with S3C24XX_GSTATUS1 instead of S3C2412_GSTATUS1 */
 178
 179         u32 gs = __raw_readl(S3C24XX_GSTATUS1);
 180
 181         /* test for s3c2416 or similar device */
 182         if ((gs >> 16) == 0x3245)
 183                 return gs;
 184 #endif
 185
 186 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
 187         return __raw_readl(S3C2412_GSTATUS1);
 188 #else
 189         return 1UL;     /* don't look like an 2400 */
 190 #endif
 191 }
 192
 193 static unsigned long s3c24xx_read_idcode_v4(void)
 194 {
 195         return __raw_readl(S3C2410_GSTATUS1);
 196 }
 197
 198 static void s3c24xx_default_idle(void)
 199 {
 200         unsigned long tmp = 0;
 201         int i;
 202
 203         /* idle the system by using the idle mode which will wait for an
 204          * interrupt to happen before restarting the system.
 205          */
 206
 207         /* Warning: going into idle state upsets jtag scanning */
 208
 209         __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
 210                      S3C2410_CLKCON);
 211
 212         /* the samsung port seems to do a loop and then unset idle.. */
 213         for (i = 0; i < 50; i++)
 214                 tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
 215
 216         /* this bit is not cleared on re-start... */
 217
 218         __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
 219                      S3C2410_CLKCON);
 220 }
 221
 222 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
 223 {
 224         arm_pm_idle = s3c24xx_default_idle;
 225
 226         /* initialise the io descriptors we need for initialisation */
 227         iotable_init(mach_desc, size);
 228         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 229
 230         if (cpu_architecture() >= CPU_ARCH_ARMv5) {
 231                 samsung_cpu_id = s3c24xx_read_idcode_v5();
 232         } else {
 233                 samsung_cpu_id = s3c24xx_read_idcode_v4();
 234         }
 235         s3c24xx_init_cpu();
 236
 237         s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 238 }
 239
 240 /* Serial port registrations */
 241
 242 static struct resource s3c2410_uart0_resource[] = {
 243         [0] = DEFINE_RES_MEM(S3C2410_PA_UART0, SZ_16K),
 244         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX0, \
 245                         IRQ_S3CUART_ERR0 - IRQ_S3CUART_RX0 + 1, \
 246                         NULL, IORESOURCE_IRQ)
 247 };
 248
 249 static struct resource s3c2410_uart1_resource[] = {
 250         [0] = DEFINE_RES_MEM(S3C2410_PA_UART1, SZ_16K),
 251         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX1, \
 252                         IRQ_S3CUART_ERR1 - IRQ_S3CUART_RX1 + 1, \
 253                         NULL, IORESOURCE_IRQ)
 254 };
 255
 256 static struct resource s3c2410_uart2_resource[] = {
 257         [0] = DEFINE_RES_MEM(S3C2410_PA_UART2, SZ_16K),
 258         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX2, \
 259                         IRQ_S3CUART_ERR2 - IRQ_S3CUART_RX2 + 1, \
 260                         NULL, IORESOURCE_IRQ)
 261 };
 262
 263 static struct resource s3c2410_uart3_resource[] = {
 264         [0] = DEFINE_RES_MEM(S3C2443_PA_UART3, SZ_16K),
 265         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX3, \
 266                         IRQ_S3CUART_ERR3 - IRQ_S3CUART_RX3 + 1, \
 267                         NULL, IORESOURCE_IRQ)
 268 };
 269
 270 struct s3c24xx_uart_resources s3c2410_uart_resources[] __initdata = {
 271         [0] = {
 272                 .resources      = s3c2410_uart0_resource,
 273                 .nr_resources   = ARRAY_SIZE(s3c2410_uart0_resource),
 274         },
 275         [1] = {
 276                 .resources      = s3c2410_uart1_resource,
 277                 .nr_resources   = ARRAY_SIZE(s3c2410_uart1_resource),
 278         },
 279         [2] = {
 280                 .resources      = s3c2410_uart2_resource,
 281                 .nr_resources   = ARRAY_SIZE(s3c2410_uart2_resource),
 282         },
 283         [3] = {
 284                 .resources      = s3c2410_uart3_resource,
 285                 .nr_resources   = ARRAY_SIZE(s3c2410_uart3_resource),
 286         },
 287 };
 288
 289 /* initialise all the clocks */
 290
 291 void __init_or_cpufreq s3c24xx_setup_clocks(unsigned long fclk,
 292                                            unsigned long hclk,
 293                                            unsigned long pclk)
 294 {
 295         clk_upll.rate = s3c24xx_get_pll(__raw_readl(S3C2410_UPLLCON),
 296                                         clk_xtal.rate);
 297
 298         clk_mpll.rate = fclk;
 299         clk_h.rate = hclk;
 300         clk_p.rate = pclk;
 301         clk_f.rate = fclk;
 302 }