drivers/platform/mips/acpi_init.c

   1 #include <linux/io.h>
   2 #include <linux/init.h>
   3 #include <linux/ioport.h>
   4 #include <linux/export.h>
   5
   6 #define SBX00_ACPI_IO_BASE 0x800
   7 #define SBX00_ACPI_IO_SIZE 0x100
   8
   9 #define ACPI_PM_EVT_BLK         (SBX00_ACPI_IO_BASE + 0x00) /* 4 bytes */
  10 #define ACPI_PM_CNT_BLK         (SBX00_ACPI_IO_BASE + 0x04) /* 2 bytes */
  11 #define ACPI_PMA_CNT_BLK        (SBX00_ACPI_IO_BASE + 0x0F) /* 1 byte */
  12 #define ACPI_PM_TMR_BLK         (SBX00_ACPI_IO_BASE + 0x18) /* 4 bytes */
  13 #define ACPI_GPE0_BLK           (SBX00_ACPI_IO_BASE + 0x10) /* 8 bytes */
  14 #define ACPI_END                (SBX00_ACPI_IO_BASE + 0x80)
  15
  16 #define PM_INDEX        0xCD6
  17 #define PM_DATA         0xCD7
  18 #define PM2_INDEX       0xCD0
  19 #define PM2_DATA        0xCD1
  20
  21 /*
  22  * SCI interrupt need acpi space, allocate here
  23  */
  24
  25 static int __init register_acpi_resource(void)
  26 {
  27         request_region(SBX00_ACPI_IO_BASE, SBX00_ACPI_IO_SIZE, "acpi");
  28         return 0;
  29 }
  30
  31 static void pmio_write_index(u16 index, u8 reg, u8 value)
  32 {
  33         outb(reg, index);
  34         outb(value, index + 1);
  35 }
  36
  37 static u8 pmio_read_index(u16 index, u8 reg)
  38 {
  39         outb(reg, index);
  40         return inb(index + 1);
  41 }
  42
  43 void pm_iowrite(u8 reg, u8 value)
  44 {
  45         pmio_write_index(PM_INDEX, reg, value);
  46 }
  47 EXPORT_SYMBOL(pm_iowrite);
  48
  49 u8 pm_ioread(u8 reg)
  50 {
  51         return pmio_read_index(PM_INDEX, reg);
  52 }
  53 EXPORT_SYMBOL(pm_ioread);
  54
  55 void pm2_iowrite(u8 reg, u8 value)
  56 {
  57         pmio_write_index(PM2_INDEX, reg, value);
  58 }
  59 EXPORT_SYMBOL(pm2_iowrite);
  60
  61 u8 pm2_ioread(u8 reg)
  62 {
  63         return pmio_read_index(PM2_INDEX, reg);
  64 }
  65 EXPORT_SYMBOL(pm2_ioread);
  66
  67 static void acpi_hw_clear_status(void)
  68 {
  69         u16 value;
  70
  71         /* PMStatus: Clear WakeStatus/PwrBtnStatus */
  72         value = inw(ACPI_PM_EVT_BLK);
  73         value |= (1 << 8 | 1 << 15);
  74         outw(value, ACPI_PM_EVT_BLK);
  75
  76         /* GPEStatus: Clear all generated events */
  77         outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);
  78 }
  79
  80 void acpi_registers_setup(void)
  81 {
  82         u32 value;
  83
  84         /* PM Status Base */
  85         pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);
  86         pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);
  87
  88         /* PM Control Base */
  89         pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);
  90         pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);
  91
  92         /* GPM Base */
  93         pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);
  94         pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);
  95
  96         /* ACPI End */
  97         pm_iowrite(0x2e, ACPI_END & 0xff);
  98         pm_iowrite(0x2f, ACPI_END >> 8);
  99
 100         /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents
 101          * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */
 102         pm_iowrite(0x0e, 1 << 3);
 103
 104         /* SCI_EN set */
 105         outw(1, ACPI_PM_CNT_BLK);
 106
 107         /* Enable to generate SCI */
 108         pm_iowrite(0x10, pm_ioread(0x10) | 1);
 109
 110         /* GPM3/GPM9 enable */
 111         value = inl(ACPI_GPE0_BLK + 4);
 112         outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);
 113
 114         /* Set GPM9 as input */
 115         pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));
 116
 117         /* Set GPM9 as non-output */
 118         pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));
 119
 120         /* GPM3 config ACPI trigger SCIOUT */
 121         pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));
 122
 123         /* GPM9 config ACPI trigger SCIOUT */
 124         pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));
 125
 126         /* GPM3 config falling edge trigger */
 127         pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));
 128
 129         /* No wait for STPGNT# in ACPI Sx state */
 130         pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));
 131
 132         /* Set GPM3 pull-down enable */
 133         value = pm2_ioread(0xf6);
 134         value |= ((1 << 7) | (1 << 3));
 135         pm2_iowrite(0xf6, value);
 136
 137         /* Set GPM9 pull-down enable */
 138         value = pm2_ioread(0xf8);
 139         value |= ((1 << 5) | (1 << 1));
 140         pm2_iowrite(0xf8, value);
 141 }
 142
 143 int __init sbx00_acpi_init(void)
 144 {
 145         register_acpi_resource();
 146         acpi_registers_setup();
 147         acpi_hw_clear_status();
 148
 149         return 0;
 150 }