+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * STMicroelectronics ConneXt (STA2X11) GPIO driver
- *
- * Copyright 2012 ST Microelectronics (Alessandro Rubini)
- * Based on gpio-ml-ioh.c, Copyright 2010 OKI Semiconductors Ltd.
- * Also based on previous sta2x11 work, Copyright 2011 Wind River Systems, Inc.
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/gpio/driver.h>
-#include <linux/bitops.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/mfd/sta2x11-mfd.h>
-
-struct gsta_regs {
- u32 dat; /* 0x00 */
- u32 dats;
- u32 datc;
- u32 pdis;
- u32 dir; /* 0x10 */
- u32 dirs;
- u32 dirc;
- u32 unused_1c;
- u32 afsela; /* 0x20 */
- u32 unused_24[7];
- u32 rimsc; /* 0x40 */
- u32 fimsc;
- u32 is;
- u32 ic;
-};
-
-struct gsta_gpio {
- spinlock_t lock;
- struct device *dev;
- void __iomem *reg_base;
- struct gsta_regs __iomem *regs[GSTA_NR_BLOCKS];
- struct gpio_chip gpio;
- int irq_base;
- /* FIXME: save the whole config here (AF, ...) */
- unsigned irq_type[GSTA_NR_GPIO];
-};
-
-/*
- * gpio methods
- */
-
-static void gsta_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
-{
- struct gsta_gpio *chip = gpiochip_get_data(gpio);
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
-
- if (val)
- writel(bit, ®s->dats);
- else
- writel(bit, ®s->datc);
-}
-
-static int gsta_gpio_get(struct gpio_chip *gpio, unsigned nr)
-{
- struct gsta_gpio *chip = gpiochip_get_data(gpio);
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
-
- return !!(readl(®s->dat) & bit);
-}
-
-static int gsta_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
- int val)
-{
- struct gsta_gpio *chip = gpiochip_get_data(gpio);
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
-
- writel(bit, ®s->dirs);
- /* Data register after direction, otherwise pullup/down is selected */
- if (val)
- writel(bit, ®s->dats);
- else
- writel(bit, ®s->datc);
- return 0;
-}
-
-static int gsta_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
-{
- struct gsta_gpio *chip = gpiochip_get_data(gpio);
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
-
- writel(bit, ®s->dirc);
- return 0;
-}
-
-static int gsta_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
-{
- struct gsta_gpio *chip = gpiochip_get_data(gpio);
- return chip->irq_base + offset;
-}
-
-static void gsta_gpio_setup(struct gsta_gpio *chip) /* called from probe */
-{
- struct gpio_chip *gpio = &chip->gpio;
-
- /*
- * ARCH_NR_GPIOS is currently 256 and dynamic allocation starts
- * from the end. However, for compatibility, we need the first
- * ConneXt device to start from gpio 0: it's the main chipset
- * on most boards so documents and drivers assume gpio0..gpio127
- */
- static int gpio_base;
-
- gpio->label = dev_name(chip->dev);
- gpio->owner = THIS_MODULE;
- gpio->direction_input = gsta_gpio_direction_input;
- gpio->get = gsta_gpio_get;
- gpio->direction_output = gsta_gpio_direction_output;
- gpio->set = gsta_gpio_set;
- gpio->dbg_show = NULL;
- gpio->base = gpio_base;
- gpio->ngpio = GSTA_NR_GPIO;
- gpio->can_sleep = false;
- gpio->to_irq = gsta_gpio_to_irq;
-
- /*
- * After the first device, turn to dynamic gpio numbers.
- * For example, with ARCH_NR_GPIOS = 256 we can fit two cards
- */
- if (!gpio_base)
- gpio_base = -1;
-}
-
-/*
- * Special method: alternate functions and pullup/pulldown. This is only
- * invoked on startup to configure gpio's according to platform data.
- * FIXME : this functionality shall be managed (and exported to other drivers)
- * via the pin control subsystem.
- */
-static void gsta_set_config(struct gsta_gpio *chip, int nr, unsigned cfg)
-{
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- unsigned long flags;
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
- u32 val;
- int err = 0;
-
- pr_info("%s: %p %i %i\n", __func__, chip, nr, cfg);
-
- if (cfg == PINMUX_TYPE_NONE)
- return;
-
- /* Alternate function or not? */
- spin_lock_irqsave(&chip->lock, flags);
- val = readl(®s->afsela);
- if (cfg == PINMUX_TYPE_FUNCTION)
- val |= bit;
- else
- val &= ~bit;
- writel(val | bit, ®s->afsela);
- if (cfg == PINMUX_TYPE_FUNCTION) {
- spin_unlock_irqrestore(&chip->lock, flags);
- return;
- }
-
- /* not alternate function: set details */
- switch (cfg) {
- case PINMUX_TYPE_OUTPUT_LOW:
- writel(bit, ®s->dirs);
- writel(bit, ®s->datc);
- break;
- case PINMUX_TYPE_OUTPUT_HIGH:
- writel(bit, ®s->dirs);
- writel(bit, ®s->dats);
- break;
- case PINMUX_TYPE_INPUT:
- writel(bit, ®s->dirc);
- val = readl(®s->pdis) | bit;
- writel(val, ®s->pdis);
- break;
- case PINMUX_TYPE_INPUT_PULLUP:
- writel(bit, ®s->dirc);
- val = readl(®s->pdis) & ~bit;
- writel(val, ®s->pdis);
- writel(bit, ®s->dats);
- break;
- case PINMUX_TYPE_INPUT_PULLDOWN:
- writel(bit, ®s->dirc);
- val = readl(®s->pdis) & ~bit;
- writel(val, ®s->pdis);
- writel(bit, ®s->datc);
- break;
- default:
- err = 1;
- }
- spin_unlock_irqrestore(&chip->lock, flags);
- if (err)
- pr_err("%s: chip %p, pin %i, cfg %i is invalid\n",
- __func__, chip, nr, cfg);
-}
-
-/*
- * Irq methods
- */
-
-static void gsta_irq_disable(struct irq_data *data)
-{
- struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
- struct gsta_gpio *chip = gc->private;
- int nr = data->irq - chip->irq_base;
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
- u32 val;
- unsigned long flags;
-
- spin_lock_irqsave(&chip->lock, flags);
- if (chip->irq_type[nr] & IRQ_TYPE_EDGE_RISING) {
- val = readl(®s->rimsc) & ~bit;
- writel(val, ®s->rimsc);
- }
- if (chip->irq_type[nr] & IRQ_TYPE_EDGE_FALLING) {
- val = readl(®s->fimsc) & ~bit;
- writel(val, ®s->fimsc);
- }
- spin_unlock_irqrestore(&chip->lock, flags);
- return;
-}
-
-static void gsta_irq_enable(struct irq_data *data)
-{
- struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
- struct gsta_gpio *chip = gc->private;
- int nr = data->irq - chip->irq_base;
- struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK];
- u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK);
- u32 val;
- int type;
- unsigned long flags;
-
- type = chip->irq_type[nr];
-
- spin_lock_irqsave(&chip->lock, flags);
- val = readl(®s->rimsc);
- if (type & IRQ_TYPE_EDGE_RISING)
- writel(val | bit, ®s->rimsc);
- else
- writel(val & ~bit, ®s->rimsc);
- val = readl(®s->rimsc);
- if (type & IRQ_TYPE_EDGE_FALLING)
- writel(val | bit, ®s->fimsc);
- else
- writel(val & ~bit, ®s->fimsc);
- spin_unlock_irqrestore(&chip->lock, flags);
- return;
-}
-
-static int gsta_irq_type(struct irq_data *d, unsigned int type)
-{
- struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- struct gsta_gpio *chip = gc->private;
- int nr = d->irq - chip->irq_base;
-
- /* We only support edge interrupts */
- if (!(type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))) {
- pr_debug("%s: unsupported type 0x%x\n", __func__, type);
- return -EINVAL;
- }
-
- chip->irq_type[nr] = type; /* used for enable/disable */
-
- gsta_irq_enable(d);
- return 0;
-}
-
-static irqreturn_t gsta_gpio_handler(int irq, void *dev_id)
-{
- struct gsta_gpio *chip = dev_id;
- struct gsta_regs __iomem *regs;
- u32 is;
- int i, nr, base;
- irqreturn_t ret = IRQ_NONE;
-
- for (i = 0; i < GSTA_NR_BLOCKS; i++) {
- regs = chip->regs[i];
- base = chip->irq_base + i * GSTA_GPIO_PER_BLOCK;
- while ((is = readl(®s->is))) {
- nr = __ffs(is);
- irq = base + nr;
- generic_handle_irq(irq);
- writel(1 << nr, ®s->ic);
- ret = IRQ_HANDLED;
- }
- }
- return ret;
-}
-
-static int gsta_alloc_irq_chip(struct gsta_gpio *chip)
-{
- struct irq_chip_generic *gc;
- struct irq_chip_type *ct;
- int rv;
-
- gc = devm_irq_alloc_generic_chip(chip->dev, KBUILD_MODNAME, 1,
- chip->irq_base,
- chip->reg_base, handle_simple_irq);
- if (!gc)
- return -ENOMEM;
-
- gc->private = chip;
- ct = gc->chip_types;
-
- ct->chip.irq_set_type = gsta_irq_type;
- ct->chip.irq_disable = gsta_irq_disable;
- ct->chip.irq_enable = gsta_irq_enable;
-
- /* FIXME: this makes at most 32 interrupts. Request 0 by now */
- rv = devm_irq_setup_generic_chip(chip->dev, gc,
- 0 /* IRQ_MSK(GSTA_GPIO_PER_BLOCK) */,
- 0, IRQ_NOREQUEST | IRQ_NOPROBE, 0);
- if (rv)
- return rv;
-
- /* Set up all 128 interrupts: code from setup_generic_chip */
- {
- struct irq_chip_type *ct = gc->chip_types;
- int i, j;
- for (j = 0; j < GSTA_NR_GPIO; j++) {
- i = chip->irq_base + j;
- irq_set_chip_and_handler(i, &ct->chip, ct->handler);
- irq_set_chip_data(i, gc);
- irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
- }
- gc->irq_cnt = i - gc->irq_base;
- }
-
- return 0;
-}
-
-/* The platform device used here is instantiated by the MFD device */
-static int gsta_probe(struct platform_device *dev)
-{
- int i, err;
- struct pci_dev *pdev;
- struct sta2x11_gpio_pdata *gpio_pdata;
- struct gsta_gpio *chip;
-
- pdev = *(struct pci_dev **)dev_get_platdata(&dev->dev);
- gpio_pdata = dev_get_platdata(&pdev->dev);
-
- if (gpio_pdata == NULL)
- dev_err(&dev->dev, "no gpio config\n");
- pr_debug("gpio config: %p\n", gpio_pdata);
-
- chip = devm_kzalloc(&dev->dev, sizeof(*chip), GFP_KERNEL);
- if (!chip)
- return -ENOMEM;
- chip->dev = &dev->dev;
- chip->reg_base = devm_platform_ioremap_resource(dev, 0);
- if (IS_ERR(chip->reg_base))
- return PTR_ERR(chip->reg_base);
-
- for (i = 0; i < GSTA_NR_BLOCKS; i++) {
- chip->regs[i] = chip->reg_base + i * 4096;
- /* disable all irqs */
- writel(0, &chip->regs[i]->rimsc);
- writel(0, &chip->regs[i]->fimsc);
- writel(~0, &chip->regs[i]->ic);
- }
- spin_lock_init(&chip->lock);
- gsta_gpio_setup(chip);
- if (gpio_pdata)
- for (i = 0; i < GSTA_NR_GPIO; i++)
- gsta_set_config(chip, i, gpio_pdata->pinconfig[i]);
-
- /* 384 was used in previous code: be compatible for other drivers */
- err = devm_irq_alloc_descs(&dev->dev, -1, 384,
- GSTA_NR_GPIO, NUMA_NO_NODE);
- if (err < 0) {
- dev_warn(&dev->dev, "sta2x11 gpio: Can't get irq base (%i)\n",
- -err);
- return err;
- }
- chip->irq_base = err;
-
- err = gsta_alloc_irq_chip(chip);
- if (err)
- return err;
-
- err = devm_request_irq(&dev->dev, pdev->irq, gsta_gpio_handler,
- IRQF_SHARED, KBUILD_MODNAME, chip);
- if (err < 0) {
- dev_err(&dev->dev, "sta2x11 gpio: Can't request irq (%i)\n",
- -err);
- return err;
- }
-
- return devm_gpiochip_add_data(&dev->dev, &chip->gpio, chip);
-}
-
-static struct platform_driver sta2x11_gpio_platform_driver = {
- .driver = {
- .name = "sta2x11-gpio",
- .suppress_bind_attrs = true,
- },
- .probe = gsta_probe,
-};
-builtin_platform_driver(sta2x11_gpio_platform_driver);
projects / linux-2.6-microblaze.git / blobdiff