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/cpu-freq.h>
  51 #include <plat/pll.h>
  52
  53 #include "common.h"
  54
  55 /* table of supported CPUs */
  56
  57 static const char name_s3c2410[]  = "S3C2410";
  58 static const char name_s3c2412[]  = "S3C2412";
  59 static const char name_s3c2416[]  = "S3C2416/S3C2450";
  60 static const char name_s3c2440[]  = "S3C2440";
  61 static const char name_s3c2442[]  = "S3C2442";
  62 static const char name_s3c2442b[]  = "S3C2442B";
  63 static const char name_s3c2443[]  = "S3C2443";
  64 static const char name_s3c2410a[] = "S3C2410A";
  65 static const char name_s3c2440a[] = "S3C2440A";
  66
  67 static struct cpu_table cpu_ids[] __initdata = {
  68         {
  69                 .idcode         = 0x32410000,
  70                 .idmask         = 0xffffffff,
  71                 .map_io         = s3c2410_map_io,
  72                 .init_clocks    = s3c2410_init_clocks,
  73                 .init_uarts     = s3c2410_init_uarts,
  74                 .init           = s3c2410_init,
  75                 .name           = name_s3c2410
  76         },
  77         {
  78                 .idcode         = 0x32410002,
  79                 .idmask         = 0xffffffff,
  80                 .map_io         = s3c2410_map_io,
  81                 .init_clocks    = s3c2410_init_clocks,
  82                 .init_uarts     = s3c2410_init_uarts,
  83                 .init           = s3c2410a_init,
  84                 .name           = name_s3c2410a
  85         },
  86         {
  87                 .idcode         = 0x32440000,
  88                 .idmask         = 0xffffffff,
  89                 .map_io         = s3c2440_map_io,
  90                 .init_clocks    = s3c244x_init_clocks,
  91                 .init_uarts     = s3c244x_init_uarts,
  92                 .init           = s3c2440_init,
  93                 .name           = name_s3c2440
  94         },
  95         {
  96                 .idcode         = 0x32440001,
  97                 .idmask         = 0xffffffff,
  98                 .map_io         = s3c2440_map_io,
  99                 .init_clocks    = s3c244x_init_clocks,
 100                 .init_uarts     = s3c244x_init_uarts,
 101                 .init           = s3c2440_init,
 102                 .name           = name_s3c2440a
 103         },
 104         {
 105                 .idcode         = 0x32440aaa,
 106                 .idmask         = 0xffffffff,
 107                 .map_io         = s3c2442_map_io,
 108                 .init_clocks    = s3c244x_init_clocks,
 109                 .init_uarts     = s3c244x_init_uarts,
 110                 .init           = s3c2442_init,
 111                 .name           = name_s3c2442
 112         },
 113         {
 114                 .idcode         = 0x32440aab,
 115                 .idmask         = 0xffffffff,
 116                 .map_io         = s3c2442_map_io,
 117                 .init_clocks    = s3c244x_init_clocks,
 118                 .init_uarts     = s3c244x_init_uarts,
 119                 .init           = s3c2442_init,
 120                 .name           = name_s3c2442b
 121         },
 122         {
 123                 .idcode         = 0x32412001,
 124                 .idmask         = 0xffffffff,
 125                 .map_io         = s3c2412_map_io,
 126                 .init_clocks    = s3c2412_init_clocks,
 127                 .init_uarts     = s3c2412_init_uarts,
 128                 .init           = s3c2412_init,
 129                 .name           = name_s3c2412,
 130         },
 131         {                       /* a newer version of the s3c2412 */
 132                 .idcode         = 0x32412003,
 133                 .idmask         = 0xffffffff,
 134                 .map_io         = s3c2412_map_io,
 135                 .init_clocks    = s3c2412_init_clocks,
 136                 .init_uarts     = s3c2412_init_uarts,
 137                 .init           = s3c2412_init,
 138                 .name           = name_s3c2412,
 139         },
 140         {                       /* a strange version of the s3c2416 */
 141                 .idcode         = 0x32450003,
 142                 .idmask         = 0xffffffff,
 143                 .map_io         = s3c2416_map_io,
 144                 .init_clocks    = s3c2416_init_clocks,
 145                 .init_uarts     = s3c2416_init_uarts,
 146                 .init           = s3c2416_init,
 147                 .name           = name_s3c2416,
 148         },
 149         {
 150                 .idcode         = 0x32443001,
 151                 .idmask         = 0xffffffff,
 152                 .map_io         = s3c2443_map_io,
 153                 .init_clocks    = s3c2443_init_clocks,
 154                 .init_uarts     = s3c2443_init_uarts,
 155                 .init           = s3c2443_init,
 156                 .name           = name_s3c2443,
 157         },
 158 };
 159
 160 /* minimal IO mapping */
 161
 162 static struct map_desc s3c_iodesc[] __initdata = {
 163         IODESC_ENT(GPIO),
 164         IODESC_ENT(IRQ),
 165         IODESC_ENT(MEMCTRL),
 166         IODESC_ENT(UART)
 167 };
 168
 169 /* read cpu identificaiton code */
 170
 171 static unsigned long s3c24xx_read_idcode_v5(void)
 172 {
 173 #if defined(CONFIG_CPU_S3C2416)
 174         /* s3c2416 is v5, with S3C24XX_GSTATUS1 instead of S3C2412_GSTATUS1 */
 175
 176         u32 gs = __raw_readl(S3C24XX_GSTATUS1);
 177
 178         /* test for s3c2416 or similar device */
 179         if ((gs >> 16) == 0x3245)
 180                 return gs;
 181 #endif
 182
 183 #if defined(CONFIG_CPU_S3C2412) || defined(CONFIG_CPU_S3C2413)
 184         return __raw_readl(S3C2412_GSTATUS1);
 185 #else
 186         return 1UL;     /* don't look like an 2400 */
 187 #endif
 188 }
 189
 190 static unsigned long s3c24xx_read_idcode_v4(void)
 191 {
 192         return __raw_readl(S3C2410_GSTATUS1);
 193 }
 194
 195 static void s3c24xx_default_idle(void)
 196 {
 197         unsigned long tmp = 0;
 198         int i;
 199
 200         /* idle the system by using the idle mode which will wait for an
 201          * interrupt to happen before restarting the system.
 202          */
 203
 204         /* Warning: going into idle state upsets jtag scanning */
 205
 206         __raw_writel(__raw_readl(S3C2410_CLKCON) | S3C2410_CLKCON_IDLE,
 207                      S3C2410_CLKCON);
 208
 209         /* the samsung port seems to do a loop and then unset idle.. */
 210         for (i = 0; i < 50; i++)
 211                 tmp += __raw_readl(S3C2410_CLKCON); /* ensure loop not optimised out */
 212
 213         /* this bit is not cleared on re-start... */
 214
 215         __raw_writel(__raw_readl(S3C2410_CLKCON) & ~S3C2410_CLKCON_IDLE,
 216                      S3C2410_CLKCON);
 217 }
 218
 219 void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
 220 {
 221         arm_pm_idle = s3c24xx_default_idle;
 222
 223         /* initialise the io descriptors we need for initialisation */
 224         iotable_init(mach_desc, size);
 225         iotable_init(s3c_iodesc, ARRAY_SIZE(s3c_iodesc));
 226
 227         if (cpu_architecture() >= CPU_ARCH_ARMv5) {
 228                 samsung_cpu_id = s3c24xx_read_idcode_v5();
 229         } else {
 230                 samsung_cpu_id = s3c24xx_read_idcode_v4();
 231         }
 232         s3c24xx_init_cpu();
 233
 234         s3c_init_cpu(samsung_cpu_id, cpu_ids, ARRAY_SIZE(cpu_ids));
 235 }
 236
 237 /* Serial port registrations */
 238
 239 #define S3C2410_PA_UART0      (S3C24XX_PA_UART)
 240 #define S3C2410_PA_UART1      (S3C24XX_PA_UART + 0x4000 )
 241 #define S3C2410_PA_UART2      (S3C24XX_PA_UART + 0x8000 )
 242 #define S3C2443_PA_UART3      (S3C24XX_PA_UART + 0xC000 )
 243
 244 static struct resource s3c2410_uart0_resource[] = {
 245         [0] = DEFINE_RES_MEM(S3C2410_PA_UART0, SZ_16K),
 246         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX0, \
 247                         IRQ_S3CUART_ERR0 - IRQ_S3CUART_RX0 + 1, \
 248                         NULL, IORESOURCE_IRQ)
 249 };
 250
 251 static struct resource s3c2410_uart1_resource[] = {
 252         [0] = DEFINE_RES_MEM(S3C2410_PA_UART1, SZ_16K),
 253         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX1, \
 254                         IRQ_S3CUART_ERR1 - IRQ_S3CUART_RX1 + 1, \
 255                         NULL, IORESOURCE_IRQ)
 256 };
 257
 258 static struct resource s3c2410_uart2_resource[] = {
 259         [0] = DEFINE_RES_MEM(S3C2410_PA_UART2, SZ_16K),
 260         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX2, \
 261                         IRQ_S3CUART_ERR2 - IRQ_S3CUART_RX2 + 1, \
 262                         NULL, IORESOURCE_IRQ)
 263 };
 264
 265 static struct resource s3c2410_uart3_resource[] = {
 266         [0] = DEFINE_RES_MEM(S3C2443_PA_UART3, SZ_16K),
 267         [1] = DEFINE_RES_NAMED(IRQ_S3CUART_RX3, \
 268                         IRQ_S3CUART_ERR3 - IRQ_S3CUART_RX3 + 1, \
 269                         NULL, IORESOURCE_IRQ)
 270 };
 271
 272 struct s3c24xx_uart_resources s3c2410_uart_resources[] __initdata = {
 273         [0] = {
 274                 .resources      = s3c2410_uart0_resource,
 275                 .nr_resources   = ARRAY_SIZE(s3c2410_uart0_resource),
 276         },
 277         [1] = {
 278                 .resources      = s3c2410_uart1_resource,
 279                 .nr_resources   = ARRAY_SIZE(s3c2410_uart1_resource),
 280         },
 281         [2] = {
 282                 .resources      = s3c2410_uart2_resource,
 283                 .nr_resources   = ARRAY_SIZE(s3c2410_uart2_resource),
 284         },
 285         [3] = {
 286                 .resources      = s3c2410_uart3_resource,
 287                 .nr_resources   = ARRAY_SIZE(s3c2410_uart3_resource),
 288         },
 289 };
 290
 291 /* initialise all the clocks */
 292
 293 void __init_or_cpufreq s3c24xx_setup_clocks(unsigned long fclk,
 294                                            unsigned long hclk,
 295                                            unsigned long pclk)
 296 {
 297         clk_upll.rate = s3c24xx_get_pll(__raw_readl(S3C2410_UPLLCON),
 298                                         clk_xtal.rate);
 299
 300         clk_mpll.rate = fclk;
 301         clk_h.rate = hclk;
 302         clk_p.rate = pclk;
 303         clk_f.rate = fclk;
 304 }