Merge tag 'gpio-v4.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "This is the bulk of GPIO changes for the v4.17 kernel cycle:

  New drivers:

   - Nintendo Wii GameCube GPIO, known as "Hollywood"

   - Raspberry Pi mailbox service GPIO expander

   - Spreadtrum main SC9860 SoC and IEC GPIO controllers.

  Improvements:

   - Implemented .get_multiple() callback for most of the
     high-performance industrial GPIO cards for the ISA bus.

   - ISA GPIO drivers now select the ISA_BUS_API instead of depending on
     it. This is merged with the same pattern for all the ISA drivers
     and some other Kconfig cleanups related to this.

  Cleanup:

   - Delete the TZ1090 GPIO drivers following the deletion of this SoC
     from the ARM tree.

   - Move the documentation over to driver-api to conform with the rest
     of the kernel documentation build.

   - Continue to make the GPIO drivers include only
     <linux/gpio/driver.h> and not the too broad <linux/gpio.h> that we
     want to get rid of.

   - Managed to remove VLA allocation from two drivers pending more
     fixes in this area for the next merge window.

   - Misc janitorial fixes"

* tag 'gpio-v4.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (77 commits)
  gpio: Add Spreadtrum PMIC EIC driver support
  gpio: Add Spreadtrum EIC driver support
  dt-bindings: gpio: Add Spreadtrum EIC controller documentation
  gpio: ath79: Fix potential NULL dereference in ath79_gpio_probe()
  pinctrl: qcom: Don't allow protected pins to be requested
  gpiolib: Support 'gpio-reserved-ranges' property
  gpiolib: Change bitmap allocation to kmalloc_array
  gpiolib: Extract mask allocation into subroutine
  dt-bindings: gpio: Add a gpio-reserved-ranges property
  gpio: mockup: fix a potential crash when creating debugfs entries
  gpio: pca953x: add compatibility for pcal6524 and pcal9555a
  gpio: dwapb: Add support for a bus clock
  gpio: Remove VLA from xra1403 driver
  gpio: Remove VLA from MAX3191X driver
  gpio: ws16c48: Implement get_multiple callback
  gpio: gpio-mm: Implement get_multiple callback
  gpio: 104-idi-48: Implement get_multiple callback
  gpio: 104-dio-48e: Implement get_multiple callback
  gpio: pcie-idio-24: Implement get_multiple/set_multiple callbacks
  gpio: pci-idio-16: Implement get_multiple callback
  ...

1 files changed, 117 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pcie-idio-24.c b/drivers/gpio/gpio-pcie-idio-24.c
index f666e2e69074..835607ecf658 100644
--- a/drivers/gpio/gpio-pcie-idio-24.c
+++ b/drivers/gpio/gpio-pcie-idio-24.c
@@ -15,6 +15,7 @@
  * This driver supports the following ACCES devices: PCIe-IDIO-24,
  * PCIe-IDI-24, PCIe-IDO-24, and PCIe-IDIO-12.
  */
+#include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/device.h>
 #include <linux/errno.h>
@@ -193,6 +194,61 @@ static int idio_24_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	return !!(ioread8(&idio24gpio->reg->ttl_in0_7) & offset_mask);
 }
 
+static int idio_24_gpio_get_multiple(struct gpio_chip *chip,
+	unsigned long *mask, unsigned long *bits)
+{
+	struct idio_24_gpio *const idio24gpio = gpiochip_get_data(chip);
+	size_t i;
+	const unsigned int gpio_reg_size = 8;
+	unsigned int bits_offset;
+	size_t word_index;
+	unsigned int word_offset;
+	unsigned long word_mask;
+	const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+	unsigned long port_state;
+	u8 __iomem ports[] = {
+		idio24gpio->reg->out0_7, idio24gpio->reg->out8_15,
+		idio24gpio->reg->out16_23, idio24gpio->reg->in0_7,
+		idio24gpio->reg->in8_15, idio24gpio->reg->in16_23,
+	};
+	const unsigned long out_mode_mask = BIT(1);
+
+	/* clear bits array to a clean slate */
+	bitmap_zero(bits, chip->ngpio);
+
+	/* get bits are evaluated a gpio port register at a time */
+	for (i = 0; i < ARRAY_SIZE(ports); i++) {
+		/* gpio offset in bits array */
+		bits_offset = i * gpio_reg_size;
+
+		/* word index for bits array */
+		word_index = BIT_WORD(bits_offset);
+
+		/* gpio offset within current word of bits array */
+		word_offset = bits_offset % BITS_PER_LONG;
+
+		/* mask of get bits for current gpio within current word */
+		word_mask = mask[word_index] & (port_mask << word_offset);
+		if (!word_mask) {
+			/* no get bits in this port so skip to next one */
+			continue;
+		}
+
+		/* read bits from current gpio port (port 6 is TTL GPIO) */
+		if (i < 6)
+			port_state = ioread8(ports + i);
+		else if (ioread8(&idio24gpio->reg->ctl) & out_mode_mask)
+			port_state = ioread8(&idio24gpio->reg->ttl_out0_7);
+		else
+			port_state = ioread8(&idio24gpio->reg->ttl_in0_7);
+
+		/* store acquired bits at respective bits array offset */
+		bits[word_index] |= port_state << word_offset;
+	}
+
+	return 0;
+}
+
 static void idio_24_gpio_set(struct gpio_chip *chip, unsigned int offset,
 	int value)
 {
@@ -234,6 +290,65 @@ static void idio_24_gpio_set(struct gpio_chip *chip, unsigned int offset,
 	raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
 }
 
+static void idio_24_gpio_set_multiple(struct gpio_chip *chip,
+	unsigned long *mask, unsigned long *bits)
+{
+	struct idio_24_gpio *const idio24gpio = gpiochip_get_data(chip);
+	size_t i;
+	unsigned long bits_offset;
+	unsigned long gpio_mask;
+	const unsigned int gpio_reg_size = 8;
+	const unsigned long port_mask = GENMASK(gpio_reg_size, 0);
+	unsigned long flags;
+	unsigned int out_state;
+	u8 __iomem ports[] = {
+		idio24gpio->reg->out0_7, idio24gpio->reg->out8_15,
+		idio24gpio->reg->out16_23
+	};
+	const unsigned long out_mode_mask = BIT(1);
+	const unsigned int ttl_offset = 48;
+	const size_t ttl_i = BIT_WORD(ttl_offset);
+	const unsigned int word_offset = ttl_offset % BITS_PER_LONG;
+	const unsigned long ttl_mask = (mask[ttl_i] >> word_offset) & port_mask;
+	const unsigned long ttl_bits = (bits[ttl_i] >> word_offset) & ttl_mask;
+
+	/* set bits are processed a gpio port register at a time */
+	for (i = 0; i < ARRAY_SIZE(ports); i++) {
+		/* gpio offset in bits array */
+		bits_offset = i * gpio_reg_size;
+
+		/* check if any set bits for current port */
+		gpio_mask = (*mask >> bits_offset) & port_mask;
+		if (!gpio_mask) {
+			/* no set bits for this port so move on to next port */
+			continue;
+		}
+
+		raw_spin_lock_irqsave(&idio24gpio->lock, flags);
+
+		/* process output lines */
+		out_state = ioread8(ports + i) & ~gpio_mask;
+		out_state |= (*bits >> bits_offset) & gpio_mask;
+		iowrite8(out_state, ports + i);
+
+		raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
+	}
+
+	/* check if setting TTL lines and if they are in output mode */
+	if (!ttl_mask || !(ioread8(&idio24gpio->reg->ctl) & out_mode_mask))
+		return;
+
+	/* handle TTL output */
+	raw_spin_lock_irqsave(&idio24gpio->lock, flags);
+
+	/* process output lines */
+	out_state = ioread8(&idio24gpio->reg->ttl_out0_7) & ~ttl_mask;
+	out_state |= ttl_bits;
+	iowrite8(out_state, &idio24gpio->reg->ttl_out0_7);
+
+	raw_spin_unlock_irqrestore(&idio24gpio->lock, flags);
+}
+
 static void idio_24_irq_ack(struct irq_data *data)
 {
 }
@@ -397,7 +512,9 @@ static int idio_24_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	idio24gpio->chip.direction_input = idio_24_gpio_direction_input;
 	idio24gpio->chip.direction_output = idio_24_gpio_direction_output;
 	idio24gpio->chip.get = idio_24_gpio_get;
+	idio24gpio->chip.get_multiple = idio_24_gpio_get_multiple;
 	idio24gpio->chip.set = idio_24_gpio_set;
+	idio24gpio->chip.set_multiple = idio_24_gpio_set_multiple;
 
 	raw_spin_lock_init(&idio24gpio->lock);