arch/arm/mach-s3c/s3c2412.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2006 Simtec Electronics
   4 //      Ben Dooks <ben@simtec.co.uk>
   5 //
   6 // http://armlinux.simtec.co.uk/.
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/list.h>
  12 #include <linux/timer.h>
  13 #include <linux/init.h>
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/syscore_ops.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/serial_s3c.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/io.h>
  22 #include <linux/reboot.h>
  23
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <asm/proc-fns.h>
  29 #include <asm/irq.h>
  30 #include <asm/system_misc.h>
  31
  32 #include "map.h"
  33 #include "regs-clock.h"
  34 #include "regs-gpio.h"
  35
  36 #include "cpu.h"
  37 #include "devs.h"
  38 #include "pm.h"
  39
  40 #include "s3c24xx.h"
  41 #include "nand-core-s3c24xx.h"
  42 #include "regs-dsc-s3c24xx.h"
  43 #include "s3c2412-power.h"
  44
  45 #ifndef CONFIG_CPU_S3C2412_ONLY
  46 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
  47
  48 static inline void s3c2412_init_gpio2(void)
  49 {
  50         s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
  51 }
  52 #else
  53 #define s3c2412_init_gpio2() do { } while(0)
  54 #endif
  55
  56 /* Initial IO mappings */
  57
  58 static struct map_desc s3c2412_iodesc[] __initdata __maybe_unused = {
  59         IODESC_ENT(CLKPWR),
  60         IODESC_ENT(TIMER),
  61         IODESC_ENT(WATCHDOG),
  62         {
  63                 .virtual = (unsigned long)S3C2412_VA_SSMC,
  64                 .pfn     = __phys_to_pfn(S3C2412_PA_SSMC),
  65                 .length  = SZ_1M,
  66                 .type    = MT_DEVICE,
  67         },
  68         {
  69                 .virtual = (unsigned long)S3C2412_VA_EBI,
  70                 .pfn     = __phys_to_pfn(S3C2412_PA_EBI),
  71                 .length  = SZ_1M,
  72                 .type    = MT_DEVICE,
  73         },
  74 };
  75
  76 /* uart registration process */
  77
  78 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  79 {
  80         s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
  81
  82         /* rename devices that are s3c2412/s3c2413 specific */
  83         s3c_device_sdi.name  = "s3c2412-sdi";
  84         s3c_device_lcd.name  = "s3c2412-lcd";
  85         s3c_nand_setname("s3c2412-nand");
  86
  87         /* alter IRQ of SDI controller */
  88
  89         s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
  90         s3c_device_sdi.resource[1].end   = IRQ_S3C2412_SDI;
  91
  92         /* spi channel related changes, s3c2412/13 specific */
  93         s3c_device_spi0.name = "s3c2412-spi";
  94         s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
  95         s3c_device_spi1.name = "s3c2412-spi";
  96         s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
  97         s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
  98
  99 }
 100
 101 /* s3c2412_idle
 102  *
 103  * use the standard idle call by ensuring the idle mode
 104  * in power config, then issuing the idle co-processor
 105  * instruction
 106 */
 107
 108 static void s3c2412_idle(void)
 109 {
 110         unsigned long tmp;
 111
 112         /* ensure our idle mode is to go to idle */
 113
 114         tmp = __raw_readl(S3C2412_PWRCFG);
 115         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 116         tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
 117         __raw_writel(tmp, S3C2412_PWRCFG);
 118
 119         cpu_do_idle();
 120 }
 121
 122 /* s3c2412_map_io
 123  *
 124  * register the standard cpu IO areas, and any passed in from the
 125  * machine specific initialisation.
 126 */
 127
 128 void __init s3c2412_map_io(void)
 129 {
 130         /* move base of IO */
 131
 132         s3c2412_init_gpio2();
 133
 134         /* set our idle function */
 135
 136         arm_pm_idle = s3c2412_idle;
 137
 138         /* register our io-tables */
 139
 140         iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
 141 }
 142
 143 /* need to register the subsystem before we actually register the device, and
 144  * we also need to ensure that it has been initialised before any of the
 145  * drivers even try to use it (even if not on an s3c2412 based system)
 146  * as a driver which may support both 2410 and 2440 may try and use it.
 147 */
 148
 149 struct bus_type s3c2412_subsys = {
 150         .name = "s3c2412-core",
 151         .dev_name = "s3c2412-core",
 152 };
 153
 154 static int __init s3c2412_core_init(void)
 155 {
 156         return subsys_system_register(&s3c2412_subsys, NULL);
 157 }
 158
 159 core_initcall(s3c2412_core_init);
 160
 161 static struct device s3c2412_dev = {
 162         .bus            = &s3c2412_subsys,
 163 };
 164
 165 int __init s3c2412_init(void)
 166 {
 167         printk("S3C2412: Initialising architecture\n");
 168
 169 #ifdef CONFIG_PM_SLEEP
 170         register_syscore_ops(&s3c2412_pm_syscore_ops);
 171         register_syscore_ops(&s3c24xx_irq_syscore_ops);
 172 #endif
 173
 174         return device_register(&s3c2412_dev);
 175 }