arch/mips/loongson64/acpi_init.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/io.h>
   3 #include <linux/init.h>
   4 #include <linux/ioport.h>
   5 #include <linux/export.h>
   6
   7 #define SBX00_ACPI_IO_BASE 0x800
   8 #define SBX00_ACPI_IO_SIZE 0x100
   9
  10 #define ACPI_PM_EVT_BLK         (SBX00_ACPI_IO_BASE + 0x00) /* 4 bytes */
  11 #define ACPI_PM_CNT_BLK         (SBX00_ACPI_IO_BASE + 0x04) /* 2 bytes */
  12 #define ACPI_PMA_CNT_BLK        (SBX00_ACPI_IO_BASE + 0x0F) /* 1 byte */
  13 #define ACPI_PM_TMR_BLK         (SBX00_ACPI_IO_BASE + 0x18) /* 4 bytes */
  14 #define ACPI_GPE0_BLK           (SBX00_ACPI_IO_BASE + 0x10) /* 8 bytes */
  15 #define ACPI_END                (SBX00_ACPI_IO_BASE + 0x80)
  16
  17 #define PM_INDEX        0xCD6
  18 #define PM_DATA         0xCD7
  19 #define PM2_INDEX       0xCD0
  20 #define PM2_DATA        0xCD1
  21
  22 /*
  23  * SCI interrupt need acpi space, allocate here
  24  */
  25
  26 static int __init register_acpi_resource(void)
  27 {
  28         request_region(SBX00_ACPI_IO_BASE, SBX00_ACPI_IO_SIZE, "acpi");
  29         return 0;
  30 }
  31
  32 static void pmio_write_index(u16 index, u8 reg, u8 value)
  33 {
  34         outb(reg, index);
  35         outb(value, index + 1);
  36 }
  37
  38 static u8 pmio_read_index(u16 index, u8 reg)
  39 {
  40         outb(reg, index);
  41         return inb(index + 1);
  42 }
  43
  44 void pm_iowrite(u8 reg, u8 value)
  45 {
  46         pmio_write_index(PM_INDEX, reg, value);
  47 }
  48 EXPORT_SYMBOL(pm_iowrite);
  49
  50 u8 pm_ioread(u8 reg)
  51 {
  52         return pmio_read_index(PM_INDEX, reg);
  53 }
  54 EXPORT_SYMBOL(pm_ioread);
  55
  56 void pm2_iowrite(u8 reg, u8 value)
  57 {
  58         pmio_write_index(PM2_INDEX, reg, value);
  59 }
  60 EXPORT_SYMBOL(pm2_iowrite);
  61
  62 u8 pm2_ioread(u8 reg)
  63 {
  64         return pmio_read_index(PM2_INDEX, reg);
  65 }
  66 EXPORT_SYMBOL(pm2_ioread);
  67
  68 static void acpi_hw_clear_status(void)
  69 {
  70         u16 value;
  71
  72         /* PMStatus: Clear WakeStatus/PwrBtnStatus */
  73         value = inw(ACPI_PM_EVT_BLK);
  74         value |= (1 << 8 | 1 << 15);
  75         outw(value, ACPI_PM_EVT_BLK);
  76
  77         /* GPEStatus: Clear all generated events */
  78         outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);
  79 }
  80
  81 void acpi_registers_setup(void)
  82 {
  83         u32 value;
  84
  85         /* PM Status Base */
  86         pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);
  87         pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);
  88
  89         /* PM Control Base */
  90         pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);
  91         pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);
  92
  93         /* GPM Base */
  94         pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);
  95         pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);
  96
  97         /* ACPI End */
  98         pm_iowrite(0x2e, ACPI_END & 0xff);
  99         pm_iowrite(0x2f, ACPI_END >> 8);
 100
 101         /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents
 102          * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */
 103         pm_iowrite(0x0e, 1 << 3);
 104
 105         /* SCI_EN set */
 106         outw(1, ACPI_PM_CNT_BLK);
 107
 108         /* Enable to generate SCI */
 109         pm_iowrite(0x10, pm_ioread(0x10) | 1);
 110
 111         /* GPM3/GPM9 enable */
 112         value = inl(ACPI_GPE0_BLK + 4);
 113         outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);
 114
 115         /* Set GPM9 as input */
 116         pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));
 117
 118         /* Set GPM9 as non-output */
 119         pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));
 120
 121         /* GPM3 config ACPI trigger SCIOUT */
 122         pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));
 123
 124         /* GPM9 config ACPI trigger SCIOUT */
 125         pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));
 126
 127         /* GPM3 config falling edge trigger */
 128         pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));
 129
 130         /* No wait for STPGNT# in ACPI Sx state */
 131         pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));
 132
 133         /* Set GPM3 pull-down enable */
 134         value = pm2_ioread(0xf6);
 135         value |= ((1 << 7) | (1 << 3));
 136         pm2_iowrite(0xf6, value);
 137
 138         /* Set GPM9 pull-down enable */
 139         value = pm2_ioread(0xf8);
 140         value |= ((1 << 5) | (1 << 1));
 141         pm2_iowrite(0xf8, value);
 142 }
 143
 144 int __init sbx00_acpi_init(void)
 145 {
 146         register_acpi_resource();
 147         acpi_registers_setup();
 148         acpi_hw_clear_status();
 149
 150         return 0;
 151 }