1 // SPDX-License-Identifier: GPL-2.0 2 #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 9 static 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 0xCD6 19 #define PM_DATA 0xCD7 20 #define PM2_INDEX 0xCD0 21 #define PM2_DATA 0xCD1 22 23 static void pmio_write_index(u16 index, u8 reg, u8 value) 24 { 25 outb(reg, index); 26 outb(value, index + 1); 27 } 28 29 static u8 pmio_read_index(u16 index, u8 reg) 30 { 31 outb(reg, index); 32 return inb(index + 1); 33 } 34 35 static void pm_iowrite(u8 reg, u8 value) 36 { 37 pmio_write_index(PM_INDEX, reg, value); 38 } 39 40 static u8 pm_ioread(u8 reg) 41 { 42 return pmio_read_index(PM_INDEX, reg); 43 } 44 45 static void pm2_iowrite(u8 reg, u8 value) 46 { 47 pmio_write_index(PM2_INDEX, reg, value); 48 } 49 50 static u8 pm2_ioread(u8 reg) 51 { 52 return pmio_read_index(PM2_INDEX, reg); 53 } 54 55 static 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 68 static 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 contents 89 * 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 } 130 131 static 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 } 152 153 static const struct of_device_id rs780e_acpi_match[] = { 154 { .compatible = "loongson,rs780e-acpi" }, 155 {}, 156 }; 157 158 static 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 }; 165 builtin_platform_driver(rs780e_acpi_driver); 166