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