summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpio-mmio.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--drivers/gpio/gpio-mmio.c806
1 files changed, 806 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mmio.c b/drivers/gpio/gpio-mmio.c
new file mode 100644
index 000000000..935292a30
--- /dev/null
+++ b/drivers/gpio/gpio-mmio.c
@@ -0,0 +1,806 @@
+/*
+ * Generic driver for memory-mapped GPIO controllers.
+ *
+ * Copyright 2008 MontaVista Software, Inc.
+ * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`.......
+ * ...`` ```````..
+ * ..The simplest form of a GPIO controller that the driver supports is``
+ * `.just a single "data" register, where GPIO state can be read and/or `
+ * `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.```````
+ * `````````
+ ___
+_/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...
+__________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .
+o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`
+ `....trivial..'~`.```.```
+ * ```````
+ * .```````~~~~`..`.``.``.
+ * . The driver supports `... ,..```.`~~~```````````````....````.``,,
+ * . big-endian notation, just`. .. A bit more sophisticated controllers ,
+ * . register the device with -be`. .with a pair of set/clear-bit registers ,
+ * `.. suffix. ```~~`````....`.` . affecting the data register and the .`
+ * ``.`.``...``` ```.. output pins are also supported.`
+ * ^^ `````.`````````.,``~``~``~~``````
+ * . ^^
+ * ,..`.`.`...````````````......`.`.`.`.`.`..`.`.`..
+ * .. The expectation is that in at least some cases . ,-~~~-,
+ * .this will be used with roll-your-own ASIC/FPGA .` \ /
+ * .logic in Verilog or VHDL. ~~~`````````..`````~~` \ /
+ * ..````````......``````````` \o_
+ * |
+ * ^^ / \
+ *
+ * ...`````~~`.....``.`..........``````.`.``.```........``.
+ * ` 8, 16, 32 and 64 bits registers are supported, and``.
+ * . the number of GPIOs is determined by the width of ~
+ * .. the registers. ,............```.`.`..`.`.~~~.`.`.`~
+ * `.......````.```
+ */
+
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/log2.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio/driver.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+static void bgpio_write8(void __iomem *reg, unsigned long data)
+{
+ writeb(data, reg);
+}
+
+static unsigned long bgpio_read8(void __iomem *reg)
+{
+ return readb(reg);
+}
+
+static void bgpio_write16(void __iomem *reg, unsigned long data)
+{
+ writew(data, reg);
+}
+
+static unsigned long bgpio_read16(void __iomem *reg)
+{
+ return readw(reg);
+}
+
+static void bgpio_write32(void __iomem *reg, unsigned long data)
+{
+ writel(data, reg);
+}
+
+static unsigned long bgpio_read32(void __iomem *reg)
+{
+ return readl(reg);
+}
+
+#if BITS_PER_LONG >= 64
+static void bgpio_write64(void __iomem *reg, unsigned long data)
+{
+ writeq(data, reg);
+}
+
+static unsigned long bgpio_read64(void __iomem *reg)
+{
+ return readq(reg);
+}
+#endif /* BITS_PER_LONG >= 64 */
+
+static void bgpio_write16be(void __iomem *reg, unsigned long data)
+{
+ iowrite16be(data, reg);
+}
+
+static unsigned long bgpio_read16be(void __iomem *reg)
+{
+ return ioread16be(reg);
+}
+
+static void bgpio_write32be(void __iomem *reg, unsigned long data)
+{
+ iowrite32be(data, reg);
+}
+
+static unsigned long bgpio_read32be(void __iomem *reg)
+{
+ return ioread32be(reg);
+}
+
+static unsigned long bgpio_line2mask(struct gpio_chip *gc, unsigned int line)
+{
+ if (gc->be_bits)
+ return BIT(gc->bgpio_bits - 1 - line);
+ return BIT(line);
+}
+
+static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio)
+{
+ unsigned long pinmask = bgpio_line2mask(gc, gpio);
+ bool dir = !!(gc->bgpio_dir & pinmask);
+
+ /*
+ * If the direction is OUT we read the value from the SET
+ * register, and if the direction is IN we read the value
+ * from the DAT register.
+ *
+ * If the direction bits are inverted, naturally this gets
+ * inverted too.
+ */
+ if (gc->bgpio_dir_inverted)
+ dir = !dir;
+
+ if (dir)
+ return !!(gc->read_reg(gc->reg_set) & pinmask);
+ else
+ return !!(gc->read_reg(gc->reg_dat) & pinmask);
+}
+
+/*
+ * This assumes that the bits in the GPIO register are in native endianness.
+ * We only assign the function pointer if we have that.
+ */
+static int bgpio_get_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ unsigned long get_mask = 0;
+ unsigned long set_mask = 0;
+
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+
+ /* Exploit the fact that we know which directions are set */
+ if (gc->bgpio_dir_inverted) {
+ set_mask = *mask & ~gc->bgpio_dir;
+ get_mask = *mask & gc->bgpio_dir;
+ } else {
+ set_mask = *mask & gc->bgpio_dir;
+ get_mask = *mask & ~gc->bgpio_dir;
+ }
+
+ if (set_mask)
+ *bits |= gc->read_reg(gc->reg_set) & set_mask;
+ if (get_mask)
+ *bits |= gc->read_reg(gc->reg_dat) & get_mask;
+
+ return 0;
+}
+
+static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ return !!(gc->read_reg(gc->reg_dat) & bgpio_line2mask(gc, gpio));
+}
+
+/*
+ * This only works if the bits in the GPIO register are in native endianness.
+ */
+static int bgpio_get_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+ *bits |= gc->read_reg(gc->reg_dat) & *mask;
+ return 0;
+}
+
+/*
+ * With big endian mirrored bit order it becomes more tedious.
+ */
+static int bgpio_get_multiple_be(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ unsigned long readmask = 0;
+ unsigned long val;
+ int bit;
+
+ /* Make sure we first clear any bits that are zero when we read the register */
+ *bits &= ~*mask;
+
+ /* Create a mirrored mask */
+ bit = -1;
+ while ((bit = find_next_bit(mask, gc->ngpio, bit + 1)) < gc->ngpio)
+ readmask |= bgpio_line2mask(gc, bit);
+
+ /* Read the register */
+ val = gc->read_reg(gc->reg_dat) & readmask;
+
+ /*
+ * Mirror the result into the "bits" result, this will give line 0
+ * in bit 0 ... line 31 in bit 31 for a 32bit register.
+ */
+ bit = -1;
+ while ((bit = find_next_bit(&val, gc->ngpio, bit + 1)) < gc->ngpio)
+ *bits |= bgpio_line2mask(gc, bit);
+
+ return 0;
+}
+
+static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+}
+
+static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ unsigned long mask = bgpio_line2mask(gc, gpio);
+ unsigned long flags;
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ if (val)
+ gc->bgpio_data |= mask;
+ else
+ gc->bgpio_data &= ~mask;
+
+ gc->write_reg(gc->reg_dat, gc->bgpio_data);
+
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ unsigned long mask = bgpio_line2mask(gc, gpio);
+
+ if (val)
+ gc->write_reg(gc->reg_set, mask);
+ else
+ gc->write_reg(gc->reg_clr, mask);
+}
+
+static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ unsigned long mask = bgpio_line2mask(gc, gpio);
+ unsigned long flags;
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ if (val)
+ gc->bgpio_data |= mask;
+ else
+ gc->bgpio_data &= ~mask;
+
+ gc->write_reg(gc->reg_set, gc->bgpio_data);
+
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void bgpio_multiple_get_masks(struct gpio_chip *gc,
+ unsigned long *mask, unsigned long *bits,
+ unsigned long *set_mask,
+ unsigned long *clear_mask)
+{
+ int i;
+
+ *set_mask = 0;
+ *clear_mask = 0;
+
+ for (i = 0; i < gc->bgpio_bits; i++) {
+ if (*mask == 0)
+ break;
+ if (__test_and_clear_bit(i, mask)) {
+ if (test_bit(i, bits))
+ *set_mask |= bgpio_line2mask(gc, i);
+ else
+ *clear_mask |= bgpio_line2mask(gc, i);
+ }
+ }
+}
+
+static void bgpio_set_multiple_single_reg(struct gpio_chip *gc,
+ unsigned long *mask,
+ unsigned long *bits,
+ void __iomem *reg)
+{
+ unsigned long flags;
+ unsigned long set_mask, clear_mask;
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ bgpio_multiple_get_masks(gc, mask, bits, &set_mask, &clear_mask);
+
+ gc->bgpio_data |= set_mask;
+ gc->bgpio_data &= ~clear_mask;
+
+ gc->write_reg(reg, gc->bgpio_data);
+
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+
+static void bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_dat);
+}
+
+static void bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_set);
+}
+
+static void bgpio_set_multiple_with_clear(struct gpio_chip *gc,
+ unsigned long *mask,
+ unsigned long *bits)
+{
+ unsigned long set_mask, clear_mask;
+
+ bgpio_multiple_get_masks(gc, mask, bits, &set_mask, &clear_mask);
+
+ if (set_mask)
+ gc->write_reg(gc->reg_set, set_mask);
+ if (clear_mask)
+ gc->write_reg(gc->reg_clr, clear_mask);
+}
+
+static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ return 0;
+}
+
+static int bgpio_dir_out_err(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ return -EINVAL;
+}
+
+static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ gc->set(gc, gpio, val);
+
+ return 0;
+}
+
+static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ if (gc->bgpio_dir_inverted)
+ gc->bgpio_dir |= bgpio_line2mask(gc, gpio);
+ else
+ gc->bgpio_dir &= ~bgpio_line2mask(gc, gpio);
+ gc->write_reg(gc->reg_dir, gc->bgpio_dir);
+
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ return 0;
+}
+
+static int bgpio_get_dir(struct gpio_chip *gc, unsigned int gpio)
+{
+ /* Return 0 if output, 1 of input */
+ if (gc->bgpio_dir_inverted)
+ return !!(gc->read_reg(gc->reg_dir) & bgpio_line2mask(gc, gpio));
+ else
+ return !(gc->read_reg(gc->reg_dir) & bgpio_line2mask(gc, gpio));
+}
+
+static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ unsigned long flags;
+
+ gc->set(gc, gpio, val);
+
+ spin_lock_irqsave(&gc->bgpio_lock, flags);
+
+ if (gc->bgpio_dir_inverted)
+ gc->bgpio_dir &= ~bgpio_line2mask(gc, gpio);
+ else
+ gc->bgpio_dir |= bgpio_line2mask(gc, gpio);
+ gc->write_reg(gc->reg_dir, gc->bgpio_dir);
+
+ spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+
+ return 0;
+}
+
+static int bgpio_setup_accessors(struct device *dev,
+ struct gpio_chip *gc,
+ bool byte_be)
+{
+
+ switch (gc->bgpio_bits) {
+ case 8:
+ gc->read_reg = bgpio_read8;
+ gc->write_reg = bgpio_write8;
+ break;
+ case 16:
+ if (byte_be) {
+ gc->read_reg = bgpio_read16be;
+ gc->write_reg = bgpio_write16be;
+ } else {
+ gc->read_reg = bgpio_read16;
+ gc->write_reg = bgpio_write16;
+ }
+ break;
+ case 32:
+ if (byte_be) {
+ gc->read_reg = bgpio_read32be;
+ gc->write_reg = bgpio_write32be;
+ } else {
+ gc->read_reg = bgpio_read32;
+ gc->write_reg = bgpio_write32;
+ }
+ break;
+#if BITS_PER_LONG >= 64
+ case 64:
+ if (byte_be) {
+ dev_err(dev,
+ "64 bit big endian byte order unsupported\n");
+ return -EINVAL;
+ } else {
+ gc->read_reg = bgpio_read64;
+ gc->write_reg = bgpio_write64;
+ }
+ break;
+#endif /* BITS_PER_LONG >= 64 */
+ default:
+ dev_err(dev, "unsupported data width %u bits\n", gc->bgpio_bits);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Create the device and allocate the resources. For setting GPIO's there are
+ * three supported configurations:
+ *
+ * - single input/output register resource (named "dat").
+ * - set/clear pair (named "set" and "clr").
+ * - single output register resource and single input resource ("set" and
+ * dat").
+ *
+ * For the single output register, this drives a 1 by setting a bit and a zero
+ * by clearing a bit. For the set clr pair, this drives a 1 by setting a bit
+ * in the set register and clears it by setting a bit in the clear register.
+ * The configuration is detected by which resources are present.
+ *
+ * For setting the GPIO direction, there are three supported configurations:
+ *
+ * - simple bidirection GPIO that requires no configuration.
+ * - an output direction register (named "dirout") where a 1 bit
+ * indicates the GPIO is an output.
+ * - an input direction register (named "dirin") where a 1 bit indicates
+ * the GPIO is an input.
+ */
+static int bgpio_setup_io(struct gpio_chip *gc,
+ void __iomem *dat,
+ void __iomem *set,
+ void __iomem *clr,
+ unsigned long flags)
+{
+
+ gc->reg_dat = dat;
+ if (!gc->reg_dat)
+ return -EINVAL;
+
+ if (set && clr) {
+ gc->reg_set = set;
+ gc->reg_clr = clr;
+ gc->set = bgpio_set_with_clear;
+ gc->set_multiple = bgpio_set_multiple_with_clear;
+ } else if (set && !clr) {
+ gc->reg_set = set;
+ gc->set = bgpio_set_set;
+ gc->set_multiple = bgpio_set_multiple_set;
+ } else if (flags & BGPIOF_NO_OUTPUT) {
+ gc->set = bgpio_set_none;
+ gc->set_multiple = NULL;
+ } else {
+ gc->set = bgpio_set;
+ gc->set_multiple = bgpio_set_multiple;
+ }
+
+ if (!(flags & BGPIOF_UNREADABLE_REG_SET) &&
+ (flags & BGPIOF_READ_OUTPUT_REG_SET)) {
+ gc->get = bgpio_get_set;
+ if (!gc->be_bits)
+ gc->get_multiple = bgpio_get_set_multiple;
+ /*
+ * We deliberately avoid assigning the ->get_multiple() call
+ * for big endian mirrored registers which are ALSO reflecting
+ * their value in the set register when used as output. It is
+ * simply too much complexity, let the GPIO core fall back to
+ * reading each line individually in that fringe case.
+ */
+ } else {
+ gc->get = bgpio_get;
+ if (gc->be_bits)
+ gc->get_multiple = bgpio_get_multiple_be;
+ else
+ gc->get_multiple = bgpio_get_multiple;
+ }
+
+ return 0;
+}
+
+static int bgpio_setup_direction(struct gpio_chip *gc,
+ void __iomem *dirout,
+ void __iomem *dirin,
+ unsigned long flags)
+{
+ if (dirout && dirin) {
+ return -EINVAL;
+ } else if (dirout) {
+ gc->reg_dir = dirout;
+ gc->direction_output = bgpio_dir_out;
+ gc->direction_input = bgpio_dir_in;
+ gc->get_direction = bgpio_get_dir;
+ } else if (dirin) {
+ gc->reg_dir = dirin;
+ gc->direction_output = bgpio_dir_out;
+ gc->direction_input = bgpio_dir_in;
+ gc->get_direction = bgpio_get_dir;
+ gc->bgpio_dir_inverted = true;
+ } else {
+ if (flags & BGPIOF_NO_OUTPUT)
+ gc->direction_output = bgpio_dir_out_err;
+ else
+ gc->direction_output = bgpio_simple_dir_out;
+ gc->direction_input = bgpio_simple_dir_in;
+ }
+
+ return 0;
+}
+
+static int bgpio_request(struct gpio_chip *chip, unsigned gpio_pin)
+{
+ if (gpio_pin < chip->ngpio)
+ return 0;
+
+ return -EINVAL;
+}
+
+/**
+ * bgpio_init() - Initialize generic GPIO accessor functions
+ * @gc: the GPIO chip to set up
+ * @dev: the parent device of the new GPIO chip (compulsory)
+ * @sz: the size (width) of the MMIO registers in bytes, typically 1, 2 or 4
+ * @dat: MMIO address for the register to READ the value of the GPIO lines, it
+ * is expected that a 1 in the corresponding bit in this register means the
+ * line is asserted
+ * @set: MMIO address for the register to SET the value of the GPIO lines, it is
+ * expected that we write the line with 1 in this register to drive the GPIO line
+ * high.
+ * @clr: MMIO address for the register to CLEAR the value of the GPIO lines, it is
+ * expected that we write the line with 1 in this register to drive the GPIO line
+ * low. It is allowed to leave this address as NULL, in that case the SET register
+ * will be assumed to also clear the GPIO lines, by actively writing the line
+ * with 0.
+ * @dirout: MMIO address for the register to set the line as OUTPUT. It is assumed
+ * that setting a line to 1 in this register will turn that line into an
+ * output line. Conversely, setting the line to 0 will turn that line into
+ * an input. Either this or @dirin can be defined, but never both.
+ * @dirin: MMIO address for the register to set this line as INPUT. It is assumed
+ * that setting a line to 1 in this register will turn that line into an
+ * input line. Conversely, setting the line to 0 will turn that line into
+ * an output. Either this or @dirout can be defined, but never both.
+ * @flags: Different flags that will affect the behaviour of the device, such as
+ * endianness etc.
+ */
+int bgpio_init(struct gpio_chip *gc, struct device *dev,
+ unsigned long sz, void __iomem *dat, void __iomem *set,
+ void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
+ unsigned long flags)
+{
+ int ret;
+
+ if (!is_power_of_2(sz))
+ return -EINVAL;
+
+ gc->bgpio_bits = sz * 8;
+ if (gc->bgpio_bits > BITS_PER_LONG)
+ return -EINVAL;
+
+ spin_lock_init(&gc->bgpio_lock);
+ gc->parent = dev;
+ gc->label = dev_name(dev);
+ gc->base = -1;
+ gc->ngpio = gc->bgpio_bits;
+ gc->request = bgpio_request;
+ gc->be_bits = !!(flags & BGPIOF_BIG_ENDIAN);
+
+ ret = bgpio_setup_io(gc, dat, set, clr, flags);
+ if (ret)
+ return ret;
+
+ ret = bgpio_setup_accessors(dev, gc, flags & BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+ if (ret)
+ return ret;
+
+ ret = bgpio_setup_direction(gc, dirout, dirin, flags);
+ if (ret)
+ return ret;
+
+ gc->bgpio_data = gc->read_reg(gc->reg_dat);
+ if (gc->set == bgpio_set_set &&
+ !(flags & BGPIOF_UNREADABLE_REG_SET))
+ gc->bgpio_data = gc->read_reg(gc->reg_set);
+ if (gc->reg_dir && !(flags & BGPIOF_UNREADABLE_REG_DIR))
+ gc->bgpio_dir = gc->read_reg(gc->reg_dir);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(bgpio_init);
+
+#if IS_ENABLED(CONFIG_GPIO_GENERIC_PLATFORM)
+
+static void __iomem *bgpio_map(struct platform_device *pdev,
+ const char *name,
+ resource_size_t sane_sz)
+{
+ struct resource *r;
+ resource_size_t sz;
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
+ if (!r)
+ return NULL;
+
+ sz = resource_size(r);
+ if (sz != sane_sz)
+ return IOMEM_ERR_PTR(-EINVAL);
+
+ return devm_ioremap_resource(&pdev->dev, r);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id bgpio_of_match[] = {
+ { .compatible = "brcm,bcm6345-gpio" },
+ { .compatible = "wd,mbl-gpio" },
+ { .compatible = "ni,169445-nand-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bgpio_of_match);
+
+static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev,
+ unsigned long *flags)
+{
+ struct bgpio_pdata *pdata;
+
+ if (!of_match_device(bgpio_of_match, &pdev->dev))
+ return NULL;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(struct bgpio_pdata),
+ GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ pdata->base = -1;
+
+ if (of_device_is_big_endian(pdev->dev.of_node))
+ *flags |= BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+
+ if (of_property_read_bool(pdev->dev.of_node, "no-output"))
+ *flags |= BGPIOF_NO_OUTPUT;
+
+ return pdata;
+}
+#else
+static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev,
+ unsigned long *flags)
+{
+ return NULL;
+}
+#endif /* CONFIG_OF */
+
+static int bgpio_pdev_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *r;
+ void __iomem *dat;
+ void __iomem *set;
+ void __iomem *clr;
+ void __iomem *dirout;
+ void __iomem *dirin;
+ unsigned long sz;
+ unsigned long flags = 0;
+ int err;
+ struct gpio_chip *gc;
+ struct bgpio_pdata *pdata;
+
+ pdata = bgpio_parse_dt(pdev, &flags);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+
+ if (!pdata) {
+ pdata = dev_get_platdata(dev);
+ flags = pdev->id_entry->driver_data;
+ }
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
+ if (!r)
+ return -EINVAL;
+
+ sz = resource_size(r);
+
+ dat = bgpio_map(pdev, "dat", sz);
+ if (IS_ERR(dat))
+ return PTR_ERR(dat);
+
+ set = bgpio_map(pdev, "set", sz);
+ if (IS_ERR(set))
+ return PTR_ERR(set);
+
+ clr = bgpio_map(pdev, "clr", sz);
+ if (IS_ERR(clr))
+ return PTR_ERR(clr);
+
+ dirout = bgpio_map(pdev, "dirout", sz);
+ if (IS_ERR(dirout))
+ return PTR_ERR(dirout);
+
+ dirin = bgpio_map(pdev, "dirin", sz);
+ if (IS_ERR(dirin))
+ return PTR_ERR(dirin);
+
+ gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+ if (!gc)
+ return -ENOMEM;
+
+ err = bgpio_init(gc, dev, sz, dat, set, clr, dirout, dirin, flags);
+ if (err)
+ return err;
+
+ if (pdata) {
+ if (pdata->label)
+ gc->label = pdata->label;
+ gc->base = pdata->base;
+ if (pdata->ngpio > 0)
+ gc->ngpio = pdata->ngpio;
+ }
+
+ platform_set_drvdata(pdev, gc);
+
+ return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
+}
+
+static const struct platform_device_id bgpio_id_table[] = {
+ {
+ .name = "basic-mmio-gpio",
+ .driver_data = 0,
+ }, {
+ .name = "basic-mmio-gpio-be",
+ .driver_data = BGPIOF_BIG_ENDIAN,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, bgpio_id_table);
+
+static struct platform_driver bgpio_driver = {
+ .driver = {
+ .name = "basic-mmio-gpio",
+ .of_match_table = of_match_ptr(bgpio_of_match),
+ },
+ .id_table = bgpio_id_table,
+ .probe = bgpio_pdev_probe,
+};
+
+module_platform_driver(bgpio_driver);
+
+#endif /* CONFIG_GPIO_GENERIC_PLATFORM */
+
+MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers");
+MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 01:29:03 +0000