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