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520010668a
sparse report build warning as follows: drivers/platform/mips/rs780e-acpi.c:72:6: warning: symbol 'acpi_registers_setup' was not declared. Should it be static? And function acpi_registers_setup() is not used outside of this file, so marks it static. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
// 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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