diff options
Diffstat (limited to 'drivers/platform/mips/rs780e-acpi.c')
| -rw-r--r-- | drivers/platform/mips/rs780e-acpi.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/platform/mips/rs780e-acpi.c b/drivers/platform/mips/rs780e-acpi.c new file mode 100644 index 0000000000..bb0e8ae0ee --- /dev/null +++ b/drivers/platform/mips/rs780e-acpi.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/io.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/export.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +static unsigned long acpi_iobase; + +#define ACPI_PM_EVT_BLK (acpi_iobase + 0x00) /* 4 bytes */ +#define ACPI_PM_CNT_BLK (acpi_iobase + 0x04) /* 2 bytes */ +#define ACPI_PMA_CNT_BLK (acpi_iobase + 0x0F) /* 1 byte */ +#define ACPI_PM_TMR_BLK (acpi_iobase + 0x18) /* 4 bytes */ +#define ACPI_GPE0_BLK (acpi_iobase + 0x10) /* 8 bytes */ +#define ACPI_END (acpi_iobase + 0x80) + +#define PM_INDEX 0xCD6 +#define PM_DATA 0xCD7 +#define PM2_INDEX 0xCD0 +#define PM2_DATA 0xCD1 + +static void pmio_write_index(u16 index, u8 reg, u8 value) +{ + outb(reg, index); + outb(value, index + 1); +} + +static u8 pmio_read_index(u16 index, u8 reg) +{ + outb(reg, index); + return inb(index + 1); +} + +void pm_iowrite(u8 reg, u8 value) +{ + pmio_write_index(PM_INDEX, reg, value); +} +EXPORT_SYMBOL(pm_iowrite); + +u8 pm_ioread(u8 reg) +{ + return pmio_read_index(PM_INDEX, reg); +} +EXPORT_SYMBOL(pm_ioread); + +void pm2_iowrite(u8 reg, u8 value) +{ + pmio_write_index(PM2_INDEX, reg, value); +} +EXPORT_SYMBOL(pm2_iowrite); + +u8 pm2_ioread(u8 reg) +{ + return pmio_read_index(PM2_INDEX, reg); +} +EXPORT_SYMBOL(pm2_ioread); + +static void acpi_hw_clear_status(void) +{ + u16 value; + + /* PMStatus: Clear WakeStatus/PwrBtnStatus */ + value = inw(ACPI_PM_EVT_BLK); + value |= (1 << 8 | 1 << 15); + outw(value, ACPI_PM_EVT_BLK); + + /* GPEStatus: Clear all generated events */ + outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK); +} + +static void acpi_registers_setup(void) +{ + u32 value; + + /* PM Status Base */ + pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff); + pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8); + + /* PM Control Base */ + pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff); + pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8); + + /* GPM Base */ + pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff); + pm_iowrite(0x29, ACPI_GPE0_BLK >> 8); + + /* ACPI End */ + pm_iowrite(0x2e, ACPI_END & 0xff); + pm_iowrite(0x2f, ACPI_END >> 8); + + /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents + * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */ + pm_iowrite(0x0e, 1 << 3); + + /* SCI_EN set */ + outw(1, ACPI_PM_CNT_BLK); + + /* Enable to generate SCI */ + pm_iowrite(0x10, pm_ioread(0x10) | 1); + + /* GPM3/GPM9 enable */ + value = inl(ACPI_GPE0_BLK + 4); + outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4); + + /* Set GPM9 as input */ + pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1))); + + /* Set GPM9 as non-output */ + pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3)); + + /* GPM3 config ACPI trigger SCIOUT */ + pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4))); + + /* GPM9 config ACPI trigger SCIOUT */ + pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2))); + + /* GPM3 config falling edge trigger */ + pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6))); + + /* No wait for STPGNT# in ACPI Sx state */ + pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6)); + + /* Set GPM3 pull-down enable */ + value = pm2_ioread(0xf6); + value |= ((1 << 7) | (1 << 3)); + pm2_iowrite(0xf6, value); + + /* Set GPM9 pull-down enable */ + value = pm2_ioread(0xf8); + value |= ((1 << 5) | (1 << 1)); + pm2_iowrite(0xf8, value); +} + +static int rs780e_acpi_probe(struct platform_device *pdev) +{ + struct resource *res; + + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!res) + return -ENODEV; + + /* SCI interrupt need acpi space, allocate here */ + if (!request_region(res->start, resource_size(res), "acpi")) { + pr_err("RS780E-ACPI: Failed to request IO Region\n"); + return -EBUSY; + } + + acpi_iobase = res->start; + + acpi_registers_setup(); + acpi_hw_clear_status(); + + return 0; +} + +static const struct of_device_id rs780e_acpi_match[] = { + { .compatible = "loongson,rs780e-acpi" }, + {}, +}; + +static struct platform_driver rs780e_acpi_driver = { + .probe = rs780e_acpi_probe, + .driver = { + .name = "RS780E-ACPI", + .of_match_table = rs780e_acpi_match, + }, +}; +builtin_platform_driver(rs780e_acpi_driver); |