htc-pasic3.c (4987B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Core driver for HTC PASIC3 LED/DS1WM chip. 4 * 5 * Copyright (C) 2006 Philipp Zabel <philipp.zabel@gmail.com> 6 */ 7 8#include <linux/init.h> 9#include <linux/module.h> 10#include <linux/platform_device.h> 11 12#include <linux/gpio.h> 13#include <linux/io.h> 14#include <linux/irq.h> 15#include <linux/interrupt.h> 16#include <linux/mfd/core.h> 17#include <linux/mfd/ds1wm.h> 18#include <linux/mfd/htc-pasic3.h> 19#include <linux/slab.h> 20 21struct pasic3_data { 22 void __iomem *mapping; 23 unsigned int bus_shift; 24}; 25 26#define REG_ADDR 5 27#define REG_DATA 6 28 29#define READ_MODE 0x80 30 31/* 32 * write to a secondary register on the PASIC3 33 */ 34void pasic3_write_register(struct device *dev, u32 reg, u8 val) 35{ 36 struct pasic3_data *asic = dev_get_drvdata(dev); 37 int bus_shift = asic->bus_shift; 38 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); 39 void __iomem *data = asic->mapping + (REG_DATA << bus_shift); 40 41 __raw_writeb(~READ_MODE & reg, addr); 42 __raw_writeb(val, data); 43} 44EXPORT_SYMBOL(pasic3_write_register); /* for leds-pasic3 */ 45 46/* 47 * read from a secondary register on the PASIC3 48 */ 49u8 pasic3_read_register(struct device *dev, u32 reg) 50{ 51 struct pasic3_data *asic = dev_get_drvdata(dev); 52 int bus_shift = asic->bus_shift; 53 void __iomem *addr = asic->mapping + (REG_ADDR << bus_shift); 54 void __iomem *data = asic->mapping + (REG_DATA << bus_shift); 55 56 __raw_writeb(READ_MODE | reg, addr); 57 return __raw_readb(data); 58} 59EXPORT_SYMBOL(pasic3_read_register); /* for leds-pasic3 */ 60 61/* 62 * LEDs 63 */ 64 65static struct mfd_cell led_cell __initdata = { 66 .name = "leds-pasic3", 67}; 68 69/* 70 * DS1WM 71 */ 72 73static int ds1wm_enable(struct platform_device *pdev) 74{ 75 struct device *dev = pdev->dev.parent; 76 int c; 77 78 c = pasic3_read_register(dev, 0x28); 79 pasic3_write_register(dev, 0x28, c & 0x7f); 80 81 dev_dbg(dev, "DS1WM OWM_EN low (active) %02x\n", c & 0x7f); 82 return 0; 83} 84 85static int ds1wm_disable(struct platform_device *pdev) 86{ 87 struct device *dev = pdev->dev.parent; 88 int c; 89 90 c = pasic3_read_register(dev, 0x28); 91 pasic3_write_register(dev, 0x28, c | 0x80); 92 93 dev_dbg(dev, "DS1WM OWM_EN high (inactive) %02x\n", c | 0x80); 94 return 0; 95} 96 97static struct ds1wm_driver_data ds1wm_pdata = { 98 .active_high = 0, 99 .reset_recover_delay = 1, 100}; 101 102static struct resource ds1wm_resources[] __initdata = { 103 [0] = { 104 .start = 0, 105 .flags = IORESOURCE_MEM, 106 }, 107 [1] = { 108 .start = 0, 109 .end = 0, 110 .flags = IORESOURCE_IRQ, 111 }, 112}; 113 114static const struct mfd_cell ds1wm_cell __initconst = { 115 .name = "ds1wm", 116 .enable = ds1wm_enable, 117 .disable = ds1wm_disable, 118 .platform_data = &ds1wm_pdata, 119 .pdata_size = sizeof(ds1wm_pdata), 120 .num_resources = 2, 121 .resources = ds1wm_resources, 122}; 123 124static int __init pasic3_probe(struct platform_device *pdev) 125{ 126 struct pasic3_platform_data *pdata = dev_get_platdata(&pdev->dev); 127 struct device *dev = &pdev->dev; 128 struct pasic3_data *asic; 129 struct resource *r; 130 int ret; 131 int irq = 0; 132 133 r = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 134 if (r) { 135 ds1wm_resources[1].flags = IORESOURCE_IRQ | (r->flags & 136 (IORESOURCE_IRQ_HIGHEDGE | IORESOURCE_IRQ_LOWEDGE)); 137 irq = r->start; 138 } 139 140 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 141 if (!r) 142 return -ENXIO; 143 144 if (!request_mem_region(r->start, resource_size(r), "pasic3")) 145 return -EBUSY; 146 147 asic = devm_kzalloc(dev, sizeof(struct pasic3_data), GFP_KERNEL); 148 if (!asic) 149 return -ENOMEM; 150 151 platform_set_drvdata(pdev, asic); 152 153 asic->mapping = ioremap(r->start, resource_size(r)); 154 if (!asic->mapping) { 155 dev_err(dev, "couldn't ioremap PASIC3\n"); 156 return -ENOMEM; 157 } 158 159 /* calculate bus shift from mem resource */ 160 asic->bus_shift = (resource_size(r) - 5) >> 3; 161 162 if (pdata && pdata->clock_rate) { 163 ds1wm_pdata.clock_rate = pdata->clock_rate; 164 /* the first 5 PASIC3 registers control the DS1WM */ 165 ds1wm_resources[0].end = (5 << asic->bus_shift) - 1; 166 ret = mfd_add_devices(&pdev->dev, pdev->id, 167 &ds1wm_cell, 1, r, irq, NULL); 168 if (ret < 0) 169 dev_warn(dev, "failed to register DS1WM\n"); 170 } 171 172 if (pdata && pdata->led_pdata) { 173 led_cell.platform_data = pdata->led_pdata; 174 led_cell.pdata_size = sizeof(struct pasic3_leds_machinfo); 175 ret = mfd_add_devices(&pdev->dev, pdev->id, &led_cell, 1, r, 176 0, NULL); 177 if (ret < 0) 178 dev_warn(dev, "failed to register LED device\n"); 179 } 180 181 return 0; 182} 183 184static int pasic3_remove(struct platform_device *pdev) 185{ 186 struct pasic3_data *asic = platform_get_drvdata(pdev); 187 struct resource *r; 188 189 mfd_remove_devices(&pdev->dev); 190 191 iounmap(asic->mapping); 192 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 193 release_mem_region(r->start, resource_size(r)); 194 return 0; 195} 196 197MODULE_ALIAS("platform:pasic3"); 198 199static struct platform_driver pasic3_driver = { 200 .driver = { 201 .name = "pasic3", 202 }, 203 .remove = pasic3_remove, 204}; 205 206module_platform_driver_probe(pasic3_driver, pasic3_probe); 207 208MODULE_AUTHOR("Philipp Zabel <philipp.zabel@gmail.com>"); 209MODULE_DESCRIPTION("Core driver for HTC PASIC3"); 210MODULE_LICENSE("GPL");