drivers/platform/mips/rs780e-acpi.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 #include <linux/of.h>
   7 #include <linux/platform_device.h>
   8
   9 static unsigned long acpi_iobase;
  10
  11 #define ACPI_PM_EVT_BLK         (acpi_iobase + 0x00) /* 4 bytes */
  12 #define ACPI_PM_CNT_BLK         (acpi_iobase + 0x04) /* 2 bytes */
  13 #define ACPI_PMA_CNT_BLK        (acpi_iobase + 0x0F) /* 1 byte */
  14 #define ACPI_PM_TMR_BLK         (acpi_iobase + 0x18) /* 4 bytes */
  15 #define ACPI_GPE0_BLK           (acpi_iobase + 0x10) /* 8 bytes */
  16 #define ACPI_END                (acpi_iobase + 0x80)
  17
  18 #define PM_INDEX        0xCD6
  19 #define PM_DATA         0xCD7
  20 #define PM2_INDEX       0xCD0
  21 #define PM2_DATA        0xCD1
  22
  23 static void pmio_write_index(u16 index, u8 reg, u8 value)
  24 {
  25         outb(reg, index);
  26         outb(value, index + 1);
  27 }
  28
  29 static u8 pmio_read_index(u16 index, u8 reg)
  30 {
  31         outb(reg, index);
  32         return inb(index + 1);
  33 }
  34
  35 void pm_iowrite(u8 reg, u8 value)
  36 {
  37         pmio_write_index(PM_INDEX, reg, value);
  38 }
  39 EXPORT_SYMBOL(pm_iowrite);
  40
  41 u8 pm_ioread(u8 reg)
  42 {
  43         return pmio_read_index(PM_INDEX, reg);
  44 }
  45 EXPORT_SYMBOL(pm_ioread);
  46
  47 void pm2_iowrite(u8 reg, u8 value)
  48 {
  49         pmio_write_index(PM2_INDEX, reg, value);
  50 }
  51 EXPORT_SYMBOL(pm2_iowrite);
  52
  53 u8 pm2_ioread(u8 reg)
  54 {
  55         return pmio_read_index(PM2_INDEX, reg);
  56 }
  57 EXPORT_SYMBOL(pm2_ioread);
  58
  59 static void acpi_hw_clear_status(void)
  60 {
  61         u16 value;
  62
  63         /* PMStatus: Clear WakeStatus/PwrBtnStatus */
  64         value = inw(ACPI_PM_EVT_BLK);
  65         value |= (1 << 8 | 1 << 15);
  66         outw(value, ACPI_PM_EVT_BLK);
  67
  68         /* GPEStatus: Clear all generated events */
  69         outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);
  70 }
  71
  72 static void acpi_registers_setup(void)
  73 {
  74         u32 value;
  75
  76         /* PM Status Base */
  77         pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);
  78         pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);
  79
  80         /* PM Control Base */
  81         pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);
  82         pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);
  83
  84         /* GPM Base */
  85         pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);
  86         pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);
  87
  88         /* ACPI End */
  89         pm_iowrite(0x2e, ACPI_END & 0xff);
  90         pm_iowrite(0x2f, ACPI_END >> 8);
  91
  92         /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents
  93          * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */
  94         pm_iowrite(0x0e, 1 << 3);
  95
  96         /* SCI_EN set */
  97         outw(1, ACPI_PM_CNT_BLK);
  98
  99         /* Enable to generate SCI */
 100         pm_iowrite(0x10, pm_ioread(0x10) | 1);
 101
 102         /* GPM3/GPM9 enable */
 103         value = inl(ACPI_GPE0_BLK + 4);
 104         outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);
 105
 106         /* Set GPM9 as input */
 107         pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));
 108
 109         /* Set GPM9 as non-output */
 110         pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));
 111
 112         /* GPM3 config ACPI trigger SCIOUT */
 113         pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));
 114
 115         /* GPM9 config ACPI trigger SCIOUT */
 116         pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));
 117
 118         /* GPM3 config falling edge trigger */
 119         pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));
 120
 121         /* No wait for STPGNT# in ACPI Sx state */
 122         pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));
 123
 124         /* Set GPM3 pull-down enable */
 125         value = pm2_ioread(0xf6);
 126         value |= ((1 << 7) | (1 << 3));
 127         pm2_iowrite(0xf6, value);
 128
 129         /* Set GPM9 pull-down enable */
 130         value = pm2_ioread(0xf8);
 131         value |= ((1 << 5) | (1 << 1));
 132         pm2_iowrite(0xf8, value);
 133 }
 134
 135 static int rs780e_acpi_probe(struct platform_device *pdev)
 136 {
 137         struct resource *res;
 138
 139         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 140         if (!res)
 141                 return -ENODEV;
 142
 143         /* SCI interrupt need acpi space, allocate here */
 144         if (!request_region(res->start, resource_size(res), "acpi")) {
 145                 pr_err("RS780E-ACPI: Failed to request IO Region\n");
 146                 return -EBUSY;
 147         }
 148
 149         acpi_iobase = res->start;
 150
 151         acpi_registers_setup();
 152         acpi_hw_clear_status();
 153
 154         return 0;
 155 }
 156
 157 static const struct of_device_id rs780e_acpi_match[] = {
 158         { .compatible = "loongson,rs780e-acpi" },
 159         {},
 160 };
 161
 162 static struct platform_driver rs780e_acpi_driver = {
 163         .probe = rs780e_acpi_probe,
 164         .driver = {
 165                 .name = "RS780E-ACPI",
 166                 .of_match_table = rs780e_acpi_match,
 167         },
 168 };
 169 builtin_platform_driver(rs780e_acpi_driver);