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 void pm_iowrite(u8 reg, u8 value) 36 { 37 pmio_write_index(PM_INDEX, reg, value); 38 } 39 EXPORT_SYMBOL(pm_iowrite); 40 41 u8 pm_ioread(u8 reg) 42 { 43 return pmio_read_index(PM_INDEX, reg); 44 } 45 EXPORT_SYMBOL(pm_ioread); 46 47 void pm2_iowrite(u8 reg, u8 value) 48 { 49 pmio_write_index(PM2_INDEX, reg, value); 50 } 51 EXPORT_SYMBOL(pm2_iowrite); 52 53 u8 pm2_ioread(u8 reg) 54 { 55 return pmio_read_index(PM2_INDEX, reg); 56 } 57 EXPORT_SYMBOL(pm2_ioread); 58 59 static void acpi_hw_clear_status(void) 60 { 61 u16 value; 62 63 /* PMStatus: Clear WakeStatus/PwrBtnStatus */ 64 value = inw(ACPI_PM_EVT_BLK); 65 value |= (1 << 8 | 1 << 15); 66 outw(value, ACPI_PM_EVT_BLK); 67 68 /* GPEStatus: Clear all generated events */ 69 outl(inl(ACPI_GPE0_BLK), ACPI_GPE0_BLK); 70 } 71 72 void acpi_registers_setup(void) 73 { 74 u32 value; 75 76 /* PM Status Base */ 77 pm_iowrite(0x20, ACPI_PM_EVT_BLK & 0xff); 78 pm_iowrite(0x21, ACPI_PM_EVT_BLK >> 8); 79 80 /* PM Control Base */ 81 pm_iowrite(0x22, ACPI_PM_CNT_BLK & 0xff); 82 pm_iowrite(0x23, ACPI_PM_CNT_BLK >> 8); 83 84 /* GPM Base */ 85 pm_iowrite(0x28, ACPI_GPE0_BLK & 0xff); 86 pm_iowrite(0x29, ACPI_GPE0_BLK >> 8); 87 88 /* ACPI End */ 89 pm_iowrite(0x2e, ACPI_END & 0xff); 90 pm_iowrite(0x2f, ACPI_END >> 8); 91 92 /* IO Decode: When AcpiDecodeEnable set, South-Bridge uses the contents 93 * of the PM registers at index 0x20~0x2B to decode ACPI I/O address. */ 94 pm_iowrite(0x0e, 1 << 3); 95 96 /* SCI_EN set */ 97 outw(1, ACPI_PM_CNT_BLK); 98 99 /* Enable to generate SCI */ 100 pm_iowrite(0x10, pm_ioread(0x10) | 1); 101 102 /* GPM3/GPM9 enable */ 103 value = inl(ACPI_GPE0_BLK + 4); 104 outl(value | (1 << 14) | (1 << 22), ACPI_GPE0_BLK + 4); 105 106 /* Set GPM9 as input */ 107 pm_iowrite(0x8d, pm_ioread(0x8d) & (~(1 << 1))); 108 109 /* Set GPM9 as non-output */ 110 pm_iowrite(0x94, pm_ioread(0x94) | (1 << 3)); 111 112 /* GPM3 config ACPI trigger SCIOUT */ 113 pm_iowrite(0x33, pm_ioread(0x33) & (~(3 << 4))); 114 115 /* GPM9 config ACPI trigger SCIOUT */ 116 pm_iowrite(0x3d, pm_ioread(0x3d) & (~(3 << 2))); 117 118 /* GPM3 config falling edge trigger */ 119 pm_iowrite(0x37, pm_ioread(0x37) & (~(1 << 6))); 120 121 /* No wait for STPGNT# in ACPI Sx state */ 122 pm_iowrite(0x7c, pm_ioread(0x7c) | (1 << 6)); 123 124 /* Set GPM3 pull-down enable */ 125 value = pm2_ioread(0xf6); 126 value |= ((1 << 7) | (1 << 3)); 127 pm2_iowrite(0xf6, value); 128 129 /* Set GPM9 pull-down enable */ 130 value = pm2_ioread(0xf8); 131 value |= ((1 << 5) | (1 << 1)); 132 pm2_iowrite(0xf8, value); 133 } 134 135 static int rs780e_acpi_probe(struct platform_device *pdev) 136 { 137 struct resource *res; 138 139 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 140 if (!res) 141 return -ENODEV; 142 143 /* SCI interrupt need acpi space, allocate here */ 144 if (!request_region(res->start, resource_size(res), "acpi")) { 145 pr_err("RS780E-ACPI: Failed to request IO Region\n"); 146 return -EBUSY; 147 } 148 149 acpi_iobase = res->start; 150 151 acpi_registers_setup(); 152 acpi_hw_clear_status(); 153 154 return 0; 155 } 156 157 static const struct of_device_id rs780e_acpi_match[] = { 158 { .compatible = "loongson,rs780e-acpi" }, 159 {}, 160 }; 161 162 static struct platform_driver rs780e_acpi_driver = { 163 .probe = rs780e_acpi_probe, 164 .driver = { 165 .name = "RS780E-ACPI", 166 .of_match_table = rs780e_acpi_match, 167 }, 168 }; 169 builtin_platform_driver(rs780e_acpi_driver); 170