platform/mips/rs780e-acpi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/io.h>
0003 #include <linux/init.h>
0004 #include <linux/ioport.h>
0005 #include <linux/export.h>
0006 #include <linux/of.h>
0007 #include <linux/platform_device.h>
0008
0009 static unsigned long acpi_iobase;
0010
0011 #define ACPI_PM_EVT_BLK         (acpi_iobase + 0x00) /* 4 bytes */
0012 #define ACPI_PM_CNT_BLK         (acpi_iobase + 0x04) /* 2 bytes */
0013 #define ACPI_PMA_CNT_BLK        (acpi_iobase + 0x0F) /* 1 byte */
0014 #define ACPI_PM_TMR_BLK         (acpi_iobase + 0x18) /* 4 bytes */
0015 #define ACPI_GPE0_BLK           (acpi_iobase + 0x10) /* 8 bytes */
0016 #define ACPI_END                (acpi_iobase + 0x80)
0017
0018 #define PM_INDEX        0xCD6
0019 #define PM_DATA         0xCD7
0020 #define PM2_INDEX       0xCD0
0021 #define PM2_DATA        0xCD1
0022
0023 static void pmio_write_index(u16 index, u8 reg, u8 value)
0024 {
0025     outb(reg, index);
0026     outb(value, index + 1);
0027 }
0028
0029 static u8 pmio_read_index(u16 index, u8 reg)
0030 {
0031     outb(reg, index);
0032     return inb(index + 1);
0033 }
0034
0035 void pm_iowrite(u8 reg, u8 value)
0036 {
0037     pmio_write_index(PM_INDEX, reg, value);
0038 }
0039 EXPORT_SYMBOL(pm_iowrite);
0040
0041 u8 pm_ioread(u8 reg)
0042 {
0043     return pmio_read_index(PM_INDEX, reg);
0044 }
0045 EXPORT_SYMBOL(pm_ioread);
0046
0047 void pm2_iowrite(u8 reg, u8 value)
0048 {
0049     pmio_write_index(PM2_INDEX, reg, value);
0050 }
0051 EXPORT_SYMBOL(pm2_iowrite);
0052
0053 u8 pm2_ioread(u8 reg)
0054 {
0055     return pmio_read_index(PM2_INDEX, reg);
0056 }
0057 EXPORT_SYMBOL(pm2_ioread);
0058
0059 static void acpi_hw_clear_status(void)
0060 {
0061     u16 value;
0062
0063     /* PMStatus: Clear WakeStatus/PwrBtnStatus */
0064     value = inw(ACPI_PM_EVT_BLK);
0065     value |= (1 << 8 | 1 << 15);
0066     outw(value, ACPI_PM_EVT_BLK);
0067
0068     /* GPEStatus: Clear all generated events */
0069     outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);
0070 }
0071
0072 static void acpi_registers_setup(void)
0073 {
0074     u32 value;
0075
0076     /* PM Status Base */
0077     pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);
0078     pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);
0079
0080     /* PM Control Base */
0081     pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);
0082     pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);
0083
0084     /* GPM Base */
0085     pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);
0086     pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);
0087
0088     /* ACPI End */
0089     pm_iowrite(0x2e, ACPI_END & 0xff);
0090     pm_iowrite(0x2f, ACPI_END >> 8);
0091
0092     /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents
0093      * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */
0094     pm_iowrite(0x0e, 1 << 3);
0095
0096     /* SCI_EN set */
0097     outw(1, ACPI_PM_CNT_BLK);
0098
0099     /* Enable to generate SCI */
0100     pm_iowrite(0x10, pm_ioread(0x10) | 1);
0101
0102     /* GPM3/GPM9 enable */
0103     value = inl(ACPI_GPE0_BLK + 4);
0104     outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);
0105
0106     /* Set GPM9 as input */
0107     pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));
0108
0109     /* Set GPM9 as non-output */
0110     pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));
0111
0112     /* GPM3 config ACPI trigger SCIOUT */
0113     pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));
0114
0115     /* GPM9 config ACPI trigger SCIOUT */
0116     pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));
0117
0118     /* GPM3 config falling edge trigger */
0119     pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));
0120
0121     /* No wait for STPGNT# in ACPI Sx state */
0122     pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));
0123
0124     /* Set GPM3 pull-down enable */
0125     value = pm2_ioread(0xf6);
0126     value |= ((1 << 7) | (1 << 3));
0127     pm2_iowrite(0xf6, value);
0128
0129     /* Set GPM9 pull-down enable */
0130     value = pm2_ioread(0xf8);
0131     value |= ((1 << 5) | (1 << 1));
0132     pm2_iowrite(0xf8, value);
0133 }
0134
0135 static int rs780e_acpi_probe(struct platform_device *pdev)
0136 {
0137     struct resource *res;
0138
0139     res = platform_get_resource(pdev, IORESOURCE_IO, 0);
0140     if (!res)
0141         return -ENODEV;
0142
0143     /* SCI interrupt need acpi space, allocate here */
0144     if (!request_region(res->start, resource_size(res), "acpi")) {
0145         pr_err("RS780E-ACPI: Failed to request IO Region\n");
0146         return -EBUSY;
0147     }
0148
0149     acpi_iobase = res->start;
0150
0151     acpi_registers_setup();
0152     acpi_hw_clear_status();
0153
0154     return 0;
0155 }
0156
0157 static const struct of_device_id rs780e_acpi_match[] = {
0158     { .compatible = "loongson,rs780e-acpi" },
0159     {},
0160 };
0161
0162 static struct platform_driver rs780e_acpi_driver = {
0163     .probe = rs780e_acpi_probe,
0164     .driver = {
0165         .name = "RS780E-ACPI",
0166         .of_match_table = rs780e_acpi_match,
0167     },
0168 };
0169 builtin_platform_driver(rs780e_acpi_driver);