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169 lines
3.9 KiB
169 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/io.h> |
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#include <linux/init.h> |
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#include <linux/ioport.h> |
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#include <linux/export.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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static unsigned long acpi_iobase; |
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#define ACPI_PM_EVT_BLK (acpi_iobase + 0x00) /* 4 bytes */ |
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#define ACPI_PM_CNT_BLK (acpi_iobase + 0x04) /* 2 bytes */ |
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#define ACPI_PMA_CNT_BLK (acpi_iobase + 0x0F) /* 1 byte */ |
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#define ACPI_PM_TMR_BLK (acpi_iobase + 0x18) /* 4 bytes */ |
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#define ACPI_GPE0_BLK (acpi_iobase + 0x10) /* 8 bytes */ |
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#define ACPI_END (acpi_iobase + 0x80) |
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#define PM_INDEX 0xCD6 |
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#define PM_DATA 0xCD7 |
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#define PM2_INDEX 0xCD0 |
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#define PM2_DATA 0xCD1 |
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static void pmio_write_index(u16 index, u8 reg, u8 value) |
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{ |
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outb(reg, index); |
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outb(value, index + 1); |
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} |
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static u8 pmio_read_index(u16 index, u8 reg) |
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{ |
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outb(reg, index); |
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return inb(index + 1); |
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} |
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void pm_iowrite(u8 reg, u8 value) |
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{ |
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pmio_write_index(PM_INDEX, reg, value); |
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} |
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EXPORT_SYMBOL(pm_iowrite); |
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u8 pm_ioread(u8 reg) |
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{ |
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return pmio_read_index(PM_INDEX, reg); |
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} |
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EXPORT_SYMBOL(pm_ioread); |
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void pm2_iowrite(u8 reg, u8 value) |
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{ |
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pmio_write_index(PM2_INDEX, reg, value); |
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} |
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EXPORT_SYMBOL(pm2_iowrite); |
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u8 pm2_ioread(u8 reg) |
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{ |
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return pmio_read_index(PM2_INDEX, reg); |
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} |
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EXPORT_SYMBOL(pm2_ioread); |
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static void acpi_hw_clear_status(void) |
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{ |
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u16 value; |
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/* PMStatus: Clear WakeStatus/PwrBtnStatus */ |
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value = inw(ACPI_PM_EVT_BLK); |
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value |= (1 << 8 | 1 << 15); |
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outw(value, ACPI_PM_EVT_BLK); |
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/* GPEStatus: Clear all generated events */ |
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outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK); |
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} |
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static void acpi_registers_setup(void) |
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{ |
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u32 value; |
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/* PM Status Base */ |
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pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff); |
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pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8); |
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/* PM Control Base */ |
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pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff); |
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pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8); |
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/* GPM Base */ |
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pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff); |
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pm_iowrite(0x29, ACPI_GPE0_BLK >> 8); |
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/* ACPI End */ |
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pm_iowrite(0x2e, ACPI_END & 0xff); |
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pm_iowrite(0x2f, ACPI_END >> 8); |
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/* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents |
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* of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */ |
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pm_iowrite(0x0e, 1 << 3); |
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/* SCI_EN set */ |
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outw(1, ACPI_PM_CNT_BLK); |
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/* Enable to generate SCI */ |
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pm_iowrite(0x10, pm_ioread(0x10) | 1); |
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/* GPM3/GPM9 enable */ |
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value = inl(ACPI_GPE0_BLK + 4); |
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outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4); |
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/* Set GPM9 as input */ |
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pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1))); |
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/* Set GPM9 as non-output */ |
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pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3)); |
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/* GPM3 config ACPI trigger SCIOUT */ |
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pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4))); |
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/* GPM9 config ACPI trigger SCIOUT */ |
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pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2))); |
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/* GPM3 config falling edge trigger */ |
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pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6))); |
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/* No wait for STPGNT# in ACPI Sx state */ |
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pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6)); |
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/* Set GPM3 pull-down enable */ |
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value = pm2_ioread(0xf6); |
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value |= ((1 << 7) | (1 << 3)); |
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pm2_iowrite(0xf6, value); |
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/* Set GPM9 pull-down enable */ |
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value = pm2_ioread(0xf8); |
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value |= ((1 << 5) | (1 << 1)); |
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pm2_iowrite(0xf8, value); |
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} |
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static int rs780e_acpi_probe(struct platform_device *pdev) |
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{ |
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struct resource *res; |
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res = platform_get_resource(pdev, IORESOURCE_IO, 0); |
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if (!res) |
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return -ENODEV; |
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/* SCI interrupt need acpi space, allocate here */ |
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if (!request_region(res->start, resource_size(res), "acpi")) { |
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pr_err("RS780E-ACPI: Failed to request IO Region\n"); |
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return -EBUSY; |
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} |
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acpi_iobase = res->start; |
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acpi_registers_setup(); |
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acpi_hw_clear_status(); |
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return 0; |
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} |
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static const struct of_device_id rs780e_acpi_match[] = { |
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{ .compatible = "loongson,rs780e-acpi" }, |
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{}, |
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}; |
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static struct platform_driver rs780e_acpi_driver = { |
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.probe = rs780e_acpi_probe, |
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.driver = { |
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.name = "RS780E-ACPI", |
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.of_match_table = rs780e_acpi_match, |
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}, |
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}; |
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builtin_platform_driver(rs780e_acpi_driver);
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