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1// SPDX-License-Identifier: GPL-2.02#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 9static 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 0xCD619#define PM_DATA 0xCD720#define PM2_INDEX 0xCD021#define PM2_DATA 0xCD122 23static void pmio_write_index(u16 index, u8 reg, u8 value)24{25 outb(reg, index);26 outb(value, index + 1);27}28 29static u8 pmio_read_index(u16 index, u8 reg)30{31 outb(reg, index);32 return inb(index + 1);33}34 35static void pm_iowrite(u8 reg, u8 value)36{37 pmio_write_index(PM_INDEX, reg, value);38}39 40static u8 pm_ioread(u8 reg)41{42 return pmio_read_index(PM_INDEX, reg);43}44 45static void pm2_iowrite(u8 reg, u8 value)46{47 pmio_write_index(PM2_INDEX, reg, value);48}49 50static u8 pm2_ioread(u8 reg)51{52 return pmio_read_index(PM2_INDEX, reg);53}54 55static void acpi_hw_clear_status(void)56{57 u16 value;58 59 /* PMStatus: Clear WakeStatus/PwrBtnStatus */60 value = inw(ACPI_PM_EVT_BLK);61 value |= (1 << 8 | 1 << 15);62 outw(value, ACPI_PM_EVT_BLK);63 64 /* GPEStatus: Clear all generated events */65 outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK);66}67 68static void acpi_registers_setup(void)69{70 u32 value;71 72 /* PM Status Base */73 pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff);74 pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8);75 76 /* PM Control Base */77 pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff);78 pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8);79 80 /* GPM Base */81 pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff);82 pm_iowrite(0x29, ACPI_GPE0_BLK >> 8);83 84 /* ACPI End */85 pm_iowrite(0x2e, ACPI_END & 0xff);86 pm_iowrite(0x2f, ACPI_END >> 8);87 88 /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents89 * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */90 pm_iowrite(0x0e, 1 << 3);91 92 /* SCI_EN set */93 outw(1, ACPI_PM_CNT_BLK);94 95 /* Enable to generate SCI */96 pm_iowrite(0x10, pm_ioread(0x10) | 1);97 98 /* GPM3/GPM9 enable */99 value = inl(ACPI_GPE0_BLK + 4);100 outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4);101 102 /* Set GPM9 as input */103 pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1)));104 105 /* Set GPM9 as non-output */106 pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3));107 108 /* GPM3 config ACPI trigger SCIOUT */109 pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4)));110 111 /* GPM9 config ACPI trigger SCIOUT */112 pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2)));113 114 /* GPM3 config falling edge trigger */115 pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6)));116 117 /* No wait for STPGNT# in ACPI Sx state */118 pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6));119 120 /* Set GPM3 pull-down enable */121 value = pm2_ioread(0xf6);122 value |= ((1 << 7) | (1 << 3));123 pm2_iowrite(0xf6, value);124 125 /* Set GPM9 pull-down enable */126 value = pm2_ioread(0xf8);127 value |= ((1 << 5) | (1 << 1));128 pm2_iowrite(0xf8, value);129}130 131static int rs780e_acpi_probe(struct platform_device *pdev)132{133 struct resource *res;134 135 res = platform_get_resource(pdev, IORESOURCE_IO, 0);136 if (!res)137 return -ENODEV;138 139 /* SCI interrupt need acpi space, allocate here */140 if (!request_region(res->start, resource_size(res), "acpi")) {141 pr_err("RS780E-ACPI: Failed to request IO Region\n");142 return -EBUSY;143 }144 145 acpi_iobase = res->start;146 147 acpi_registers_setup();148 acpi_hw_clear_status();149 150 return 0;151}152 153static const struct of_device_id rs780e_acpi_match[] = {154 { .compatible = "loongson,rs780e-acpi" },155 {},156};157 158static struct platform_driver rs780e_acpi_driver = {159 .probe = rs780e_acpi_probe,160 .driver = {161 .name = "RS780E-ACPI",162 .of_match_table = rs780e_acpi_match,163 },164};165builtin_platform_driver(rs780e_acpi_driver);166