arch/arm/mach-shark/core.c

   1 /*
   2  *  linux/arch/arm/mach-shark/arch.c
   3  *
   4  *  Architecture specific stuff.
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irq.h>
  10 #include <linux/sched.h>
  11 #include <linux/serial_8250.h>
  12 #include <linux/io.h>
  13 #include <linux/cpu.h>
  14 #include <linux/reboot.h>
  15
  16 #include <asm/setup.h>
  17 #include <asm/mach-types.h>
  18 #include <asm/param.h>
  19 #include <asm/system_misc.h>
  20
  21 #include <asm/mach/map.h>
  22 #include <asm/mach/arch.h>
  23 #include <asm/mach/time.h>
  24
  25 #define ROMCARD_SIZE            0x08000000
  26 #define ROMCARD_START           0x10000000
  27
  28 static void shark_restart(enum reboot_mode mode, const char *cmd)
  29 {
  30         short temp;
  31         /* Reset the Machine via pc[3] of the sequoia chipset */
  32         outw(0x09,0x24);
  33         temp=inw(0x26);
  34         temp = temp | (1<<3) | (1<<10);
  35         outw(0x09,0x24);
  36         outw(temp,0x26);
  37 }
  38
  39 static struct plat_serial8250_port serial_platform_data[] = {
  40         {
  41                 .iobase         = 0x3f8,
  42                 .irq            = 4,
  43                 .uartclk        = 1843200,
  44                 .regshift       = 0,
  45                 .iotype         = UPIO_PORT,
  46                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  47         },
  48         {
  49                 .iobase         = 0x2f8,
  50                 .irq            = 3,
  51                 .uartclk        = 1843200,
  52                 .regshift       = 0,
  53                 .iotype         = UPIO_PORT,
  54                 .flags          = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
  55         },
  56         { },
  57 };
  58
  59 static struct platform_device serial_device = {
  60         .name                   = "serial8250",
  61         .id                     = PLAT8250_DEV_PLATFORM,
  62         .dev                    = {
  63                 .platform_data  = serial_platform_data,
  64         },
  65 };
  66
  67 static struct resource rtc_resources[] = {
  68         [0] = {
  69                 .start  = 0x70,
  70                 .end    = 0x73,
  71                 .flags  = IORESOURCE_IO,
  72         },
  73         [1] = {
  74                 .start  = IRQ_ISA_RTC_ALARM,
  75                 .end    = IRQ_ISA_RTC_ALARM,
  76                 .flags  = IORESOURCE_IRQ,
  77         }
  78 };
  79
  80 static struct platform_device rtc_device = {
  81         .name           = "rtc_cmos",
  82         .id             = -1,
  83         .resource       = rtc_resources,
  84         .num_resources  = ARRAY_SIZE(rtc_resources),
  85 };
  86
  87 static int __init shark_init(void)
  88 {
  89         int ret;
  90
  91         if (machine_is_shark())
  92         {
  93                 ret = platform_device_register(&rtc_device);
  94                 if (ret) printk(KERN_ERR "Unable to register RTC device: %d\n", ret);
  95                 ret = platform_device_register(&serial_device);
  96                 if (ret) printk(KERN_ERR "Unable to register Serial device: %d\n", ret);
  97         }
  98         return 0;
  99 }
 100
 101 arch_initcall(shark_init);
 102
 103 extern void shark_init_irq(void);
 104
 105 #define IRQ_TIMER 0
 106 #define HZ_TIME ((1193180 + HZ/2) / HZ)
 107
 108 static irqreturn_t
 109 shark_timer_interrupt(int irq, void *dev_id)
 110 {
 111         timer_tick();
 112         return IRQ_HANDLED;
 113 }
 114
 115 static struct irqaction shark_timer_irq = {
 116         .name           = "Shark Timer Tick",
 117         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 118         .handler        = shark_timer_interrupt,
 119 };
 120
 121 /*
 122  * Set up timer interrupt, and return the current time in seconds.
 123  */
 124 static void __init shark_timer_init(void)
 125 {
 126         outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
 127         outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
 128         outb(HZ_TIME >> 8, 0x40);
 129
 130         setup_irq(IRQ_TIMER, &shark_timer_irq);
 131 }
 132
 133 static void shark_init_early(void)
 134 {
 135         cpu_idle_poll_ctrl(true);
 136 }
 137
 138 MACHINE_START(SHARK, "Shark")
 139         /* Maintainer: Alexander Schulz */
 140         .atag_offset    = 0x3000,
 141         .init_early     = shark_init_early,
 142         .init_irq       = shark_init_irq,
 143         .init_time      = shark_timer_init,
 144         .dma_zone_size  = SZ_4M,
 145         .restart        = shark_restart,
 146 MACHINE_END