drivers/gpio/gpio-vf610.c

   1 /*
   2  * Freescale vf610 GPIO support through PORT and GPIO
   3  *
   4  * Copyright (c) 2014 Toradex AG.
   5  *
   6  * Author: Stefan Agner <stefan@agner.ch>.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/bitops.h>
  19 #include <linux/err.h>
  20 #include <linux/gpio.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/io.h>
  24 #include <linux/ioport.h>
  25 #include <linux/irq.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/of.h>
  28 #include <linux/of_device.h>
  29 #include <linux/of_irq.h>
  30
  31 #define VF610_GPIO_PER_PORT             32
  32
  33 struct fsl_gpio_soc_data {
  34         /* SoCs has a Port Data Direction Register (PDDR) */
  35         bool have_paddr;
  36 };
  37
  38 struct vf610_gpio_port {
  39         struct gpio_chip gc;
  40         void __iomem *base;
  41         void __iomem *gpio_base;
  42         const struct fsl_gpio_soc_data *sdata;
  43         u8 irqc[VF610_GPIO_PER_PORT];
  44         int irq;
  45 };
  46
  47 #define GPIO_PDOR               0x00
  48 #define GPIO_PSOR               0x04
  49 #define GPIO_PCOR               0x08
  50 #define GPIO_PTOR               0x0c
  51 #define GPIO_PDIR               0x10
  52 #define GPIO_PDDR               0x14
  53
  54 #define PORT_PCR(n)             ((n) * 0x4)
  55 #define PORT_PCR_IRQC_OFFSET    16
  56
  57 #define PORT_ISFR               0xa0
  58 #define PORT_DFER               0xc0
  59 #define PORT_DFCR               0xc4
  60 #define PORT_DFWR               0xc8
  61
  62 #define PORT_INT_OFF            0x0
  63 #define PORT_INT_LOGIC_ZERO     0x8
  64 #define PORT_INT_RISING_EDGE    0x9
  65 #define PORT_INT_FALLING_EDGE   0xa
  66 #define PORT_INT_EITHER_EDGE    0xb
  67 #define PORT_INT_LOGIC_ONE      0xc
  68
  69 static struct irq_chip vf610_gpio_irq_chip;
  70
  71 static const struct fsl_gpio_soc_data imx_data = {
  72         .have_paddr = true,
  73 };
  74
  75 static const struct of_device_id vf610_gpio_dt_ids[] = {
  76         { .compatible = "fsl,vf610-gpio",       .data = NULL, },
  77         { .compatible = "fsl,imx7ulp-gpio",     .data = &imx_data, },
  78         { /* sentinel */ }
  79 };
  80
  81 static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
  82 {
  83         writel_relaxed(val, reg);
  84 }
  85
  86 static inline u32 vf610_gpio_readl(void __iomem *reg)
  87 {
  88         return readl_relaxed(reg);
  89 }
  90
  91 static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  92 {
  93         struct vf610_gpio_port *port = gpiochip_get_data(gc);
  94         unsigned long mask = BIT(gpio);
  95         void __iomem *addr;
  96
  97         if (port->sdata && port->sdata->have_paddr) {
  98                 mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
  99                 addr = mask ? port->gpio_base + GPIO_PDOR :
 100                               port->gpio_base + GPIO_PDIR;
 101                 return !!(vf610_gpio_readl(addr) & BIT(gpio));
 102         } else {
 103                 return !!(vf610_gpio_readl(port->gpio_base + GPIO_PDIR)
 104                                            & BIT(gpio));
 105         }
 106 }
 107
 108 static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 109 {
 110         struct vf610_gpio_port *port = gpiochip_get_data(gc);
 111         unsigned long mask = BIT(gpio);
 112
 113         if (val)
 114                 vf610_gpio_writel(mask, port->gpio_base + GPIO_PSOR);
 115         else
 116                 vf610_gpio_writel(mask, port->gpio_base + GPIO_PCOR);
 117 }
 118
 119 static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 120 {
 121         struct vf610_gpio_port *port = gpiochip_get_data(chip);
 122         unsigned long mask = BIT(gpio);
 123         u32 val;
 124
 125         if (port->sdata && port->sdata->have_paddr) {
 126                 val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
 127                 val &= ~mask;
 128                 vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
 129         }
 130
 131         return pinctrl_gpio_direction_input(chip->base + gpio);
 132 }
 133
 134 static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
 135                                        int value)
 136 {
 137         struct vf610_gpio_port *port = gpiochip_get_data(chip);
 138         unsigned long mask = BIT(gpio);
 139
 140         if (port->sdata && port->sdata->have_paddr)
 141                 vf610_gpio_writel(mask, port->gpio_base + GPIO_PDDR);
 142
 143         vf610_gpio_set(chip, gpio, value);
 144
 145         return pinctrl_gpio_direction_output(chip->base + gpio);
 146 }
 147
 148 static void vf610_gpio_irq_handler(struct irq_desc *desc)
 149 {
 150         struct vf610_gpio_port *port =
 151                 gpiochip_get_data(irq_desc_get_handler_data(desc));
 152         struct irq_chip *chip = irq_desc_get_chip(desc);
 153         int pin;
 154         unsigned long irq_isfr;
 155
 156         chained_irq_enter(chip, desc);
 157
 158         irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
 159
 160         for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
 161                 vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
 162
 163                 generic_handle_irq(irq_find_mapping(port->gc.irqdomain, pin));
 164         }
 165
 166         chained_irq_exit(chip, desc);
 167 }
 168
 169 static void vf610_gpio_irq_ack(struct irq_data *d)
 170 {
 171         struct vf610_gpio_port *port =
 172                 gpiochip_get_data(irq_data_get_irq_chip_data(d));
 173         int gpio = d->hwirq;
 174
 175         vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
 176 }
 177
 178 static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
 179 {
 180         struct vf610_gpio_port *port =
 181                 gpiochip_get_data(irq_data_get_irq_chip_data(d));
 182         u8 irqc;
 183
 184         switch (type) {
 185         case IRQ_TYPE_EDGE_RISING:
 186                 irqc = PORT_INT_RISING_EDGE;
 187                 break;
 188         case IRQ_TYPE_EDGE_FALLING:
 189                 irqc = PORT_INT_FALLING_EDGE;
 190                 break;
 191         case IRQ_TYPE_EDGE_BOTH:
 192                 irqc = PORT_INT_EITHER_EDGE;
 193                 break;
 194         case IRQ_TYPE_LEVEL_LOW:
 195                 irqc = PORT_INT_LOGIC_ZERO;
 196                 break;
 197         case IRQ_TYPE_LEVEL_HIGH:
 198                 irqc = PORT_INT_LOGIC_ONE;
 199                 break;
 200         default:
 201                 return -EINVAL;
 202         }
 203
 204         port->irqc[d->hwirq] = irqc;
 205
 206         if (type & IRQ_TYPE_LEVEL_MASK)
 207                 irq_set_handler_locked(d, handle_level_irq);
 208         else
 209                 irq_set_handler_locked(d, handle_edge_irq);
 210
 211         return 0;
 212 }
 213
 214 static void vf610_gpio_irq_mask(struct irq_data *d)
 215 {
 216         struct vf610_gpio_port *port =
 217                 gpiochip_get_data(irq_data_get_irq_chip_data(d));
 218         void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
 219
 220         vf610_gpio_writel(0, pcr_base);
 221 }
 222
 223 static void vf610_gpio_irq_unmask(struct irq_data *d)
 224 {
 225         struct vf610_gpio_port *port =
 226                 gpiochip_get_data(irq_data_get_irq_chip_data(d));
 227         void __iomem *pcr_base = port->base + PORT_PCR(d->hwirq);
 228
 229         vf610_gpio_writel(port->irqc[d->hwirq] << PORT_PCR_IRQC_OFFSET,
 230                           pcr_base);
 231 }
 232
 233 static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
 234 {
 235         struct vf610_gpio_port *port =
 236                 gpiochip_get_data(irq_data_get_irq_chip_data(d));
 237
 238         if (enable)
 239                 enable_irq_wake(port->irq);
 240         else
 241                 disable_irq_wake(port->irq);
 242
 243         return 0;
 244 }
 245
 246 static struct irq_chip vf610_gpio_irq_chip = {
 247         .name           = "gpio-vf610",
 248         .irq_ack        = vf610_gpio_irq_ack,
 249         .irq_mask       = vf610_gpio_irq_mask,
 250         .irq_unmask     = vf610_gpio_irq_unmask,
 251         .irq_set_type   = vf610_gpio_irq_set_type,
 252         .irq_set_wake   = vf610_gpio_irq_set_wake,
 253 };
 254
 255 static int vf610_gpio_probe(struct platform_device *pdev)
 256 {
 257         const struct of_device_id *of_id = of_match_device(vf610_gpio_dt_ids,
 258                                                            &pdev->dev);
 259         struct device *dev = &pdev->dev;
 260         struct device_node *np = dev->of_node;
 261         struct vf610_gpio_port *port;
 262         struct resource *iores;
 263         struct gpio_chip *gc;
 264         int ret;
 265
 266         port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
 267         if (!port)
 268                 return -ENOMEM;
 269
 270         port->sdata = of_id->data;
 271         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 272         port->base = devm_ioremap_resource(dev, iores);
 273         if (IS_ERR(port->base))
 274                 return PTR_ERR(port->base);
 275
 276         iores = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 277         port->gpio_base = devm_ioremap_resource(dev, iores);
 278         if (IS_ERR(port->gpio_base))
 279                 return PTR_ERR(port->gpio_base);
 280
 281         port->irq = platform_get_irq(pdev, 0);
 282         if (port->irq < 0)
 283                 return port->irq;
 284
 285         gc = &port->gc;
 286         gc->of_node = np;
 287         gc->parent = dev;
 288         gc->label = "vf610-gpio";
 289         gc->ngpio = VF610_GPIO_PER_PORT;
 290         gc->base = of_alias_get_id(np, "gpio") * VF610_GPIO_PER_PORT;
 291
 292         gc->request = gpiochip_generic_request;
 293         gc->free = gpiochip_generic_free;
 294         gc->direction_input = vf610_gpio_direction_input;
 295         gc->get = vf610_gpio_get;
 296         gc->direction_output = vf610_gpio_direction_output;
 297         gc->set = vf610_gpio_set;
 298
 299         ret = gpiochip_add_data(gc, port);
 300         if (ret < 0)
 301                 return ret;
 302
 303         /* Clear the interrupt status register for all GPIO's */
 304         vf610_gpio_writel(~0, port->base + PORT_ISFR);
 305
 306         ret = gpiochip_irqchip_add(gc, &vf610_gpio_irq_chip, 0,
 307                                    handle_edge_irq, IRQ_TYPE_NONE);
 308         if (ret) {
 309                 dev_err(dev, "failed to add irqchip\n");
 310                 gpiochip_remove(gc);
 311                 return ret;
 312         }
 313         gpiochip_set_chained_irqchip(gc, &vf610_gpio_irq_chip, port->irq,
 314                                      vf610_gpio_irq_handler);
 315
 316         return 0;
 317 }
 318
 319 static struct platform_driver vf610_gpio_driver = {
 320         .driver         = {
 321                 .name   = "gpio-vf610",
 322                 .of_match_table = vf610_gpio_dt_ids,
 323         },
 324         .probe          = vf610_gpio_probe,
 325 };
 326
 327 builtin_platform_driver(vf610_gpio_driver);