1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AppliedMicro X-Gene SoC GPIO-Standby Driver 4 * 5 * Copyright (c) 2014, Applied Micro Circuits Corporation 6 * Author: Tin Huynh <tnhuynh@apm.com>. 7 * Y Vo <yvo@apm.com>. 8 * Quan Nguyen <qnguyen@apm.com>. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/io.h> 13 #include <linux/platform_device.h> 14 #include <linux/of_gpio.h> 15 #include <linux/gpio/driver.h> 16 #include <linux/acpi.h> 17 18 #include "gpiolib.h" 19 20 /* Common property names */ 21 #define XGENE_NIRQ_PROPERTY "apm,nr-irqs" 22 #define XGENE_NGPIO_PROPERTY "apm,nr-gpios" 23 #define XGENE_IRQ_START_PROPERTY "apm,irq-start" 24 25 #define XGENE_DFLT_MAX_NGPIO 22 26 #define XGENE_DFLT_MAX_NIRQ 6 27 #define XGENE_DFLT_IRQ_START_PIN 8 28 #define GPIO_MASK(x) (1U << ((x) % 32)) 29 30 #define MPA_GPIO_INT_LVL 0x0290 31 #define MPA_GPIO_OE_ADDR 0x029c 32 #define MPA_GPIO_OUT_ADDR 0x02a0 33 #define MPA_GPIO_IN_ADDR 0x02a4 34 #define MPA_GPIO_SEL_LO 0x0294 35 36 #define GPIO_INT_LEVEL_H 0x000001 37 #define GPIO_INT_LEVEL_L 0x000000 38 39 /** 40 * struct xgene_gpio_sb - GPIO-Standby private data structure. 41 * @gc: memory-mapped GPIO controllers. 42 * @regs: GPIO register base offset 43 * @irq_domain: GPIO interrupt domain 44 * @irq_start: GPIO pin that start support interrupt 45 * @nirq: Number of GPIO pins that supports interrupt 46 * @parent_irq_base: Start parent HWIRQ 47 */ 48 struct xgene_gpio_sb { 49 struct gpio_chip gc; 50 void __iomem *regs; 51 struct irq_domain *irq_domain; 52 u16 irq_start; 53 u16 nirq; 54 u16 parent_irq_base; 55 }; 56 57 #define HWIRQ_TO_GPIO(priv, hwirq) ((hwirq) + (priv)->irq_start) 58 #define GPIO_TO_HWIRQ(priv, gpio) ((gpio) - (priv)->irq_start) 59 60 static void xgene_gpio_set_bit(struct gpio_chip *gc, 61 void __iomem *reg, u32 gpio, int val) 62 { 63 u32 data; 64 65 data = gc->read_reg(reg); 66 if (val) 67 data |= GPIO_MASK(gpio); 68 else 69 data &= ~GPIO_MASK(gpio); 70 gc->write_reg(reg, data); 71 } 72 73 static int xgene_gpio_sb_irq_set_type(struct irq_data *d, unsigned int type) 74 { 75 struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d); 76 int gpio = HWIRQ_TO_GPIO(priv, d->hwirq); 77 int lvl_type = GPIO_INT_LEVEL_H; 78 79 switch (type & IRQ_TYPE_SENSE_MASK) { 80 case IRQ_TYPE_EDGE_RISING: 81 case IRQ_TYPE_LEVEL_HIGH: 82 lvl_type = GPIO_INT_LEVEL_H; 83 break; 84 case IRQ_TYPE_EDGE_FALLING: 85 case IRQ_TYPE_LEVEL_LOW: 86 lvl_type = GPIO_INT_LEVEL_L; 87 break; 88 default: 89 break; 90 } 91 92 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, 93 gpio * 2, 1); 94 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_INT_LVL, 95 d->hwirq, lvl_type); 96 97 /* Propagate IRQ type setting to parent */ 98 if (type & IRQ_TYPE_EDGE_BOTH) 99 return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING); 100 else 101 return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH); 102 } 103 104 static struct irq_chip xgene_gpio_sb_irq_chip = { 105 .name = "sbgpio", 106 .irq_eoi = irq_chip_eoi_parent, 107 .irq_mask = irq_chip_mask_parent, 108 .irq_unmask = irq_chip_unmask_parent, 109 .irq_set_type = xgene_gpio_sb_irq_set_type, 110 }; 111 112 static int xgene_gpio_sb_to_irq(struct gpio_chip *gc, u32 gpio) 113 { 114 struct xgene_gpio_sb *priv = gpiochip_get_data(gc); 115 struct irq_fwspec fwspec; 116 117 if ((gpio < priv->irq_start) || 118 (gpio > HWIRQ_TO_GPIO(priv, priv->nirq))) 119 return -ENXIO; 120 121 fwspec.fwnode = gc->parent->fwnode; 122 fwspec.param_count = 2; 123 fwspec.param[0] = GPIO_TO_HWIRQ(priv, gpio); 124 fwspec.param[1] = IRQ_TYPE_NONE; 125 return irq_create_fwspec_mapping(&fwspec); 126 } 127 128 static int xgene_gpio_sb_domain_activate(struct irq_domain *d, 129 struct irq_data *irq_data, 130 bool reserve) 131 { 132 struct xgene_gpio_sb *priv = d->host_data; 133 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq); 134 int ret; 135 136 ret = gpiochip_lock_as_irq(&priv->gc, gpio); 137 if (ret) { 138 dev_err(priv->gc.parent, 139 "Unable to configure XGene GPIO standby pin %d as IRQ\n", 140 gpio); 141 return ret; 142 } 143 144 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, 145 gpio * 2, 1); 146 return 0; 147 } 148 149 static void xgene_gpio_sb_domain_deactivate(struct irq_domain *d, 150 struct irq_data *irq_data) 151 { 152 struct xgene_gpio_sb *priv = d->host_data; 153 u32 gpio = HWIRQ_TO_GPIO(priv, irq_data->hwirq); 154 155 gpiochip_unlock_as_irq(&priv->gc, gpio); 156 xgene_gpio_set_bit(&priv->gc, priv->regs + MPA_GPIO_SEL_LO, 157 gpio * 2, 0); 158 } 159 160 static int xgene_gpio_sb_domain_translate(struct irq_domain *d, 161 struct irq_fwspec *fwspec, 162 unsigned long *hwirq, 163 unsigned int *type) 164 { 165 struct xgene_gpio_sb *priv = d->host_data; 166 167 if ((fwspec->param_count != 2) || 168 (fwspec->param[0] >= priv->nirq)) 169 return -EINVAL; 170 *hwirq = fwspec->param[0]; 171 *type = fwspec->param[1]; 172 return 0; 173 } 174 175 static int xgene_gpio_sb_domain_alloc(struct irq_domain *domain, 176 unsigned int virq, 177 unsigned int nr_irqs, void *data) 178 { 179 struct irq_fwspec *fwspec = data; 180 struct irq_fwspec parent_fwspec; 181 struct xgene_gpio_sb *priv = domain->host_data; 182 irq_hw_number_t hwirq; 183 unsigned int i; 184 185 hwirq = fwspec->param[0]; 186 for (i = 0; i < nr_irqs; i++) 187 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, 188 &xgene_gpio_sb_irq_chip, priv); 189 190 parent_fwspec.fwnode = domain->parent->fwnode; 191 if (is_of_node(parent_fwspec.fwnode)) { 192 parent_fwspec.param_count = 3; 193 parent_fwspec.param[0] = 0;/* SPI */ 194 /* Skip SGIs and PPIs*/ 195 parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32; 196 parent_fwspec.param[2] = fwspec->param[1]; 197 } else if (is_fwnode_irqchip(parent_fwspec.fwnode)) { 198 parent_fwspec.param_count = 2; 199 parent_fwspec.param[0] = hwirq + priv->parent_irq_base; 200 parent_fwspec.param[1] = fwspec->param[1]; 201 } else 202 return -EINVAL; 203 204 return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, 205 &parent_fwspec); 206 } 207 208 static const struct irq_domain_ops xgene_gpio_sb_domain_ops = { 209 .translate = xgene_gpio_sb_domain_translate, 210 .alloc = xgene_gpio_sb_domain_alloc, 211 .free = irq_domain_free_irqs_common, 212 .activate = xgene_gpio_sb_domain_activate, 213 .deactivate = xgene_gpio_sb_domain_deactivate, 214 }; 215 216 static int xgene_gpio_sb_probe(struct platform_device *pdev) 217 { 218 struct xgene_gpio_sb *priv; 219 int ret; 220 void __iomem *regs; 221 struct irq_domain *parent_domain = NULL; 222 u32 val32; 223 224 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 225 if (!priv) 226 return -ENOMEM; 227 228 regs = devm_platform_ioremap_resource(pdev, 0); 229 if (IS_ERR(regs)) 230 return PTR_ERR(regs); 231 232 priv->regs = regs; 233 234 ret = platform_get_irq(pdev, 0); 235 if (ret > 0) { 236 priv->parent_irq_base = irq_get_irq_data(ret)->hwirq; 237 parent_domain = irq_get_irq_data(ret)->domain; 238 } 239 if (!parent_domain) { 240 dev_err(&pdev->dev, "unable to obtain parent domain\n"); 241 return -ENODEV; 242 } 243 244 ret = bgpio_init(&priv->gc, &pdev->dev, 4, 245 regs + MPA_GPIO_IN_ADDR, 246 regs + MPA_GPIO_OUT_ADDR, NULL, 247 regs + MPA_GPIO_OE_ADDR, NULL, 0); 248 if (ret) 249 return ret; 250 251 priv->gc.to_irq = xgene_gpio_sb_to_irq; 252 253 /* Retrieve start irq pin, use default if property not found */ 254 priv->irq_start = XGENE_DFLT_IRQ_START_PIN; 255 if (!device_property_read_u32(&pdev->dev, 256 XGENE_IRQ_START_PROPERTY, &val32)) 257 priv->irq_start = val32; 258 259 /* Retrieve number irqs, use default if property not found */ 260 priv->nirq = XGENE_DFLT_MAX_NIRQ; 261 if (!device_property_read_u32(&pdev->dev, XGENE_NIRQ_PROPERTY, &val32)) 262 priv->nirq = val32; 263 264 /* Retrieve number gpio, use default if property not found */ 265 priv->gc.ngpio = XGENE_DFLT_MAX_NGPIO; 266 if (!device_property_read_u32(&pdev->dev, XGENE_NGPIO_PROPERTY, &val32)) 267 priv->gc.ngpio = val32; 268 269 dev_info(&pdev->dev, "Support %d gpios, %d irqs start from pin %d\n", 270 priv->gc.ngpio, priv->nirq, priv->irq_start); 271 272 platform_set_drvdata(pdev, priv); 273 274 priv->irq_domain = irq_domain_create_hierarchy(parent_domain, 275 0, priv->nirq, pdev->dev.fwnode, 276 &xgene_gpio_sb_domain_ops, priv); 277 if (!priv->irq_domain) 278 return -ENODEV; 279 280 priv->gc.irq.domain = priv->irq_domain; 281 282 ret = devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv); 283 if (ret) { 284 dev_err(&pdev->dev, 285 "failed to register X-Gene GPIO Standby driver\n"); 286 irq_domain_remove(priv->irq_domain); 287 return ret; 288 } 289 290 dev_info(&pdev->dev, "X-Gene GPIO Standby driver registered\n"); 291 292 if (priv->nirq > 0) { 293 /* Register interrupt handlers for gpio signaled acpi events */ 294 acpi_gpiochip_request_interrupts(&priv->gc); 295 } 296 297 return ret; 298 } 299 300 static int xgene_gpio_sb_remove(struct platform_device *pdev) 301 { 302 struct xgene_gpio_sb *priv = platform_get_drvdata(pdev); 303 304 if (priv->nirq > 0) { 305 acpi_gpiochip_free_interrupts(&priv->gc); 306 } 307 308 irq_domain_remove(priv->irq_domain); 309 310 return 0; 311 } 312 313 static const struct of_device_id xgene_gpio_sb_of_match[] = { 314 {.compatible = "apm,xgene-gpio-sb", }, 315 {}, 316 }; 317 MODULE_DEVICE_TABLE(of, xgene_gpio_sb_of_match); 318 319 #ifdef CONFIG_ACPI 320 static const struct acpi_device_id xgene_gpio_sb_acpi_match[] = { 321 {"APMC0D15", 0}, 322 {}, 323 }; 324 MODULE_DEVICE_TABLE(acpi, xgene_gpio_sb_acpi_match); 325 #endif 326 327 static struct platform_driver xgene_gpio_sb_driver = { 328 .driver = { 329 .name = "xgene-gpio-sb", 330 .of_match_table = xgene_gpio_sb_of_match, 331 .acpi_match_table = ACPI_PTR(xgene_gpio_sb_acpi_match), 332 }, 333 .probe = xgene_gpio_sb_probe, 334 .remove = xgene_gpio_sb_remove, 335 }; 336 module_platform_driver(xgene_gpio_sb_driver); 337 338 MODULE_AUTHOR("AppliedMicro"); 339 MODULE_DESCRIPTION("APM X-Gene GPIO Standby driver"); 340 MODULE_LICENSE("GPL"); 341