--- /dev/null
+/*
+ * GPIO driver for Marvell SoCs
+ *
+ * Copyright (C) 2012 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ * Andrew Lunn <andrew@lunn.ch>
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ *
+ * This driver is a fairly straightforward GPIO driver for the
+ * complete family of Marvell EBU SoC platforms (Orion, Dove,
+ * Kirkwood, Discovery, Armada 370/XP). The only complexity of this
+ * driver is the different register layout that exists between the
+ * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
+ * platforms (MV78200 from the Discovery family and the Armada
+ * XP). Therefore, this driver handles three variants of the GPIO
+ * block:
+ * - the basic variant, called "orion-gpio", with the simplest
+ * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
+ * non-SMP Discovery systems
+ * - the mv78200 variant for MV78200 Discovery systems. This variant
+ * turns the edge mask and level mask registers into CPU0 edge
+ * mask/level mask registers, and adds CPU1 edge mask/level mask
+ * registers.
+ * - the armadaxp variant for Armada XP systems. This variant keeps
+ * the normal cause/edge mask/level mask registers when the global
+ * interrupts are used, but adds per-CPU cause/edge mask/level mask
+ * registers n a separate memory area for the per-CPU GPIO
+ * interrupts.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/irqdomain.h>
+#include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/irqchip/chained_irq.h>
+
+/*
+ * GPIO unit register offsets.
+ */
+#define GPIO_OUT_OFF 0x0000
+#define GPIO_IO_CONF_OFF 0x0004
+#define GPIO_BLINK_EN_OFF 0x0008
+#define GPIO_IN_POL_OFF 0x000c
+#define GPIO_DATA_IN_OFF 0x0010
+#define GPIO_EDGE_CAUSE_OFF 0x0014
+#define GPIO_EDGE_MASK_OFF 0x0018
+#define GPIO_LEVEL_MASK_OFF 0x001c
+
+/* The MV78200 has per-CPU registers for edge mask and level mask */
+#define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
+#define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
+
+/* The Armada XP has per-CPU registers for interrupt cause, interrupt
+ * mask and interrupt level mask. Those are relative to the
+ * percpu_membase. */
+#define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
+#define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
+#define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
+
+#define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
+#define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
+#define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
+
+#define MVEBU_MAX_GPIO_PER_BANK 32
+
+struct mvebu_gpio_chip {
+ struct gpio_chip chip;
+ spinlock_t lock;
+ void __iomem *membase;
+ void __iomem *percpu_membase;
+ int irqbase;
+ struct irq_domain *domain;
+ int soc_variant;
+
+ /* Used to preserve GPIO registers across suspend/resume */
+ u32 out_reg;
+ u32 io_conf_reg;
+ u32 blink_en_reg;
+ u32 in_pol_reg;
+ u32 edge_mask_regs[4];
+ u32 level_mask_regs[4];
+};
+
+/*
+ * Functions returning addresses of individual registers for a given
+ * GPIO controller.
+ */
+static inline void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
+{
+ return mvchip->membase + GPIO_OUT_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
+{
+ return mvchip->membase + GPIO_BLINK_EN_OFF;
+}
+
+static inline void __iomem *
+mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
+{
+ return mvchip->membase + GPIO_IO_CONF_OFF;
+}
+
+static inline void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
+{
+ return mvchip->membase + GPIO_IN_POL_OFF;
+}
+
+static inline void __iomem *
+mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
+{
+ return mvchip->membase + GPIO_DATA_IN_OFF;
+}
+
+static inline void __iomem *
+mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
+{
+ int cpu;
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ cpu = smp_processor_id();
+ return mvchip->percpu_membase +
+ GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
+ default:
+ BUG();
+ }
+}
+
+static inline void __iomem *
+mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
+{
+ int cpu;
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ return mvchip->membase + GPIO_EDGE_MASK_OFF;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ cpu = smp_processor_id();
+ return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ cpu = smp_processor_id();
+ return mvchip->percpu_membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
+ default:
+ BUG();
+ }
+}
+
+static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
+{
+ int cpu;
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ return mvchip->membase + GPIO_LEVEL_MASK_OFF;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ cpu = smp_processor_id();
+ return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ cpu = smp_processor_id();
+ return mvchip->percpu_membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
+ default:
+ BUG();
+ }
+}
+
+/*
+ * Functions implementing the gpio_chip methods
+ */
+
+static int mvebu_gpio_request(struct gpio_chip *chip, unsigned pin)
+{
+ return pinctrl_request_gpio(chip->base + pin);
+}
+
+static void mvebu_gpio_free(struct gpio_chip *chip, unsigned pin)
+{
+ pinctrl_free_gpio(chip->base + pin);
+}
+
+static void mvebu_gpio_set(struct gpio_chip *chip, unsigned pin, int value)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ unsigned long flags;
+ u32 u;
+
+ spin_lock_irqsave(&mvchip->lock, flags);
+ u = readl_relaxed(mvebu_gpioreg_out(mvchip));
+ if (value)
+ u |= 1 << pin;
+ else
+ u &= ~(1 << pin);
+ writel_relaxed(u, mvebu_gpioreg_out(mvchip));
+ spin_unlock_irqrestore(&mvchip->lock, flags);
+}
+
+static int mvebu_gpio_get(struct gpio_chip *chip, unsigned pin)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ u32 u;
+
+ if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin)) {
+ u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
+ readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ } else {
+ u = readl_relaxed(mvebu_gpioreg_out(mvchip));
+ }
+
+ return (u >> pin) & 1;
+}
+
+static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned pin, int value)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ unsigned long flags;
+ u32 u;
+
+ spin_lock_irqsave(&mvchip->lock, flags);
+ u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
+ if (value)
+ u |= 1 << pin;
+ else
+ u &= ~(1 << pin);
+ writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
+ spin_unlock_irqrestore(&mvchip->lock, flags);
+}
+
+static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ unsigned long flags;
+ int ret;
+ u32 u;
+
+ /* Check with the pinctrl driver whether this pin is usable as
+ * an input GPIO */
+ ret = pinctrl_gpio_direction_input(chip->base + pin);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&mvchip->lock, flags);
+ u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+ u |= 1 << pin;
+ writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
+ spin_unlock_irqrestore(&mvchip->lock, flags);
+
+ return 0;
+}
+
+static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned pin,
+ int value)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ unsigned long flags;
+ int ret;
+ u32 u;
+
+ /* Check with the pinctrl driver whether this pin is usable as
+ * an output GPIO */
+ ret = pinctrl_gpio_direction_output(chip->base + pin);
+ if (ret)
+ return ret;
+
+ mvebu_gpio_blink(chip, pin, 0);
+ mvebu_gpio_set(chip, pin, value);
+
+ spin_lock_irqsave(&mvchip->lock, flags);
+ u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+ u &= ~(1 << pin);
+ writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
+ spin_unlock_irqrestore(&mvchip->lock, flags);
+
+ return 0;
+}
+
+static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ return irq_create_mapping(mvchip->domain, pin);
+}
+
+/*
+ * Functions implementing the irq_chip methods
+ */
+static void mvebu_gpio_irq_ack(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ u32 mask = ~(1 << (d->irq - gc->irq_base));
+
+ irq_gc_lock(gc);
+ writel_relaxed(mask, mvebu_gpioreg_edge_cause(mvchip));
+ irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ u32 mask = 1 << (d->irq - gc->irq_base);
+
+ irq_gc_lock(gc);
+ ct->mask_cache_priv &= ~mask;
+
+ writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
+ irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+ u32 mask = 1 << (d->irq - gc->irq_base);
+
+ irq_gc_lock(gc);
+ ct->mask_cache_priv |= mask;
+ writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
+ irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_level_irq_mask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+ u32 mask = 1 << (d->irq - gc->irq_base);
+
+ irq_gc_lock(gc);
+ ct->mask_cache_priv &= ~mask;
+ writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
+ irq_gc_unlock(gc);
+}
+
+static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+ u32 mask = 1 << (d->irq - gc->irq_base);
+
+ irq_gc_lock(gc);
+ ct->mask_cache_priv |= mask;
+ writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
+ irq_gc_unlock(gc);
+}
+
+/*****************************************************************************
+ * MVEBU GPIO IRQ
+ *
+ * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
+ * value of the line or the opposite value.
+ *
+ * Level IRQ handlers: DATA_IN is used directly as cause register.
+ * Interrupt are masked by LEVEL_MASK registers.
+ * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
+ * Interrupt are masked by EDGE_MASK registers.
+ * Both-edge handlers: Similar to regular Edge handlers, but also swaps
+ * the polarity to catch the next line transaction.
+ * This is a race condition that might not perfectly
+ * work on some use cases.
+ *
+ * Every eight GPIO lines are grouped (OR'ed) before going up to main
+ * cause register.
+ *
+ * EDGE cause mask
+ * data-in /--------| |-----| |----\
+ * -----| |----- ---- to main cause reg
+ * X \----------------| |----/
+ * polarity LEVEL mask
+ *
+ ****************************************************************************/
+
+static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+ struct mvebu_gpio_chip *mvchip = gc->private;
+ int pin;
+ u32 u;
+
+ pin = d->hwirq;
+
+ u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & (1 << pin);
+ if (!u)
+ return -EINVAL;
+
+ type &= IRQ_TYPE_SENSE_MASK;
+ if (type == IRQ_TYPE_NONE)
+ return -EINVAL;
+
+ /* Check if we need to change chip and handler */
+ if (!(ct->type & type))
+ if (irq_setup_alt_chip(d, type))
+ return -EINVAL;
+
+ /*
+ * Configure interrupt polarity.
+ */
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ case IRQ_TYPE_LEVEL_HIGH:
+ u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ u &= ~(1 << pin);
+ writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ case IRQ_TYPE_LEVEL_LOW:
+ u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ u |= 1 << pin;
+ writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+ break;
+ case IRQ_TYPE_EDGE_BOTH: {
+ u32 v;
+
+ v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
+ readl_relaxed(mvebu_gpioreg_data_in(mvchip));
+
+ /*
+ * set initial polarity based on current input level
+ */
+ u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ if (v & (1 << pin))
+ u |= 1 << pin; /* falling */
+ else
+ u &= ~(1 << pin); /* rising */
+ writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
+ break;
+ }
+ }
+ return 0;
+}
+
+static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ struct mvebu_gpio_chip *mvchip = irq_get_handler_data(irq);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ u32 cause, type;
+ int i;
+
+ if (mvchip == NULL)
+ return;
+
+ chained_irq_enter(chip, desc);
+
+ cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
+ readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
+ cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
+ readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
+
+ for (i = 0; i < mvchip->chip.ngpio; i++) {
+ int irq;
+
+ irq = mvchip->irqbase + i;
+
+ if (!(cause & (1 << i)))
+ continue;
+
+ type = irq_get_trigger_type(irq);
+ if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
+ /* Swap polarity (race with GPIO line) */
+ u32 polarity;
+
+ polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ polarity ^= 1 << i;
+ writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
+ }
+
+ generic_handle_irq(irq);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/seq_file.h>
+
+static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+ struct mvebu_gpio_chip *mvchip =
+ container_of(chip, struct mvebu_gpio_chip, chip);
+ u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
+ int i;
+
+ out = readl_relaxed(mvebu_gpioreg_out(mvchip));
+ io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
+ blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
+ in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
+ data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
+ cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
+ edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
+ lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
+
+ for (i = 0; i < chip->ngpio; i++) {
+ const char *label;
+ u32 msk;
+ bool is_out;
+
+ label = gpiochip_is_requested(chip, i);
+ if (!label)
+ continue;
+
+ msk = 1 << i;
+ is_out = !(io_conf & msk);
+
+ seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
+
+ if (is_out) {
+ seq_printf(s, " out %s %s\n",
+ out & msk ? "hi" : "lo",
+ blink & msk ? "(blink )" : "");
+ continue;
+ }
+
+ seq_printf(s, " in %s (act %s) - IRQ",
+ (data_in ^ in_pol) & msk ? "hi" : "lo",
+ in_pol & msk ? "lo" : "hi");
+ if (!((edg_msk | lvl_msk) & msk)) {
+ seq_puts(s, " disabled\n");
+ continue;
+ }
+ if (edg_msk & msk)
+ seq_puts(s, " edge ");
+ if (lvl_msk & msk)
+ seq_puts(s, " level");
+ seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
+ }
+}
+#else
+#define mvebu_gpio_dbg_show NULL
+#endif
+
+static const struct of_device_id mvebu_gpio_of_match[] = {
+ {
+ .compatible = "marvell,orion-gpio",
+ .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
+ },
+ {
+ .compatible = "marvell,mv78200-gpio",
+ .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
+ },
+ {
+ .compatible = "marvell,armadaxp-gpio",
+ .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
+ },
+ {
+ /* sentinel */
+ },
+};
+MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
+
+static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
+ mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
+ mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
+ mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ mvchip->edge_mask_regs[0] =
+ readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
+ mvchip->level_mask_regs[0] =
+ readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_MV78200_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static int mvebu_gpio_resume(struct platform_device *pdev)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
+ writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
+ writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
+ writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ writel(mvchip->edge_mask_regs[0],
+ mvchip->membase + GPIO_EDGE_MASK_OFF);
+ writel(mvchip->level_mask_regs[0],
+ mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static int mvebu_gpio_probe(struct platform_device *pdev)
+{
+ struct mvebu_gpio_chip *mvchip;
+ const struct of_device_id *match;
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *res;
+ struct irq_chip_generic *gc;
+ struct irq_chip_type *ct;
+ struct clk *clk;
+ unsigned int ngpios;
+ int soc_variant;
+ int i, cpu, id;
+ int err;
+
+ match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
+ if (match)
+ soc_variant = (int) match->data;
+ else
+ soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
+
+ mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
+ GFP_KERNEL);
+ if (!mvchip)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, mvchip);
+
+ if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
+ dev_err(&pdev->dev, "Missing ngpios OF property\n");
+ return -ENODEV;
+ }
+
+ id = of_alias_get_id(pdev->dev.of_node, "gpio");
+ if (id < 0) {
+ dev_err(&pdev->dev, "Couldn't get OF id\n");
+ return id;
+ }
+
+ clk = devm_clk_get(&pdev->dev, NULL);
+ /* Not all SoCs require a clock.*/
+ if (!IS_ERR(clk))
+ clk_prepare_enable(clk);
+
+ mvchip->soc_variant = soc_variant;
+ mvchip->chip.label = dev_name(&pdev->dev);
+ mvchip->chip.dev = &pdev->dev;
+ mvchip->chip.request = mvebu_gpio_request;
+ mvchip->chip.free = mvebu_gpio_free;
+ mvchip->chip.direction_input = mvebu_gpio_direction_input;
+ mvchip->chip.get = mvebu_gpio_get;
+ mvchip->chip.direction_output = mvebu_gpio_direction_output;
+ mvchip->chip.set = mvebu_gpio_set;
+ mvchip->chip.to_irq = mvebu_gpio_to_irq;
+ mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
+ mvchip->chip.ngpio = ngpios;
+ mvchip->chip.can_sleep = false;
+ mvchip->chip.of_node = np;
+ mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
+
+ spin_lock_init(&mvchip->lock);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(mvchip->membase))
+ return PTR_ERR(mvchip->membase);
+
+ /* The Armada XP has a second range of registers for the
+ * per-CPU registers */
+ if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
+ res);
+ if (IS_ERR(mvchip->percpu_membase))
+ return PTR_ERR(mvchip->percpu_membase);
+ }
+
+ /*
+ * Mask and clear GPIO interrupts.
+ */
+ switch (soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+ writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
+ writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+ for (cpu = 0; cpu < 2; cpu++) {
+ writel_relaxed(0, mvchip->membase +
+ GPIO_EDGE_MASK_MV78200_OFF(cpu));
+ writel_relaxed(0, mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(cpu));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
+ writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
+ writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ for (cpu = 0; cpu < 4; cpu++) {
+ writel_relaxed(0, mvchip->percpu_membase +
+ GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
+ writel_relaxed(0, mvchip->percpu_membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
+ writel_relaxed(0, mvchip->percpu_membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ gpiochip_add(&mvchip->chip);
+
+ /* Some gpio controllers do not provide irq support */
+ if (!of_irq_count(np))
+ return 0;
+
+ /* Setup the interrupt handlers. Each chip can have up to 4
+ * interrupt handlers, with each handler dealing with 8 GPIO
+ * pins. */
+ for (i = 0; i < 4; i++) {
+ int irq = platform_get_irq(pdev, i);
+
+ if (irq < 0)
+ continue;
+ irq_set_handler_data(irq, mvchip);
+ irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
+ }
+
+ mvchip->irqbase = irq_alloc_descs(-1, 0, ngpios, -1);
+ if (mvchip->irqbase < 0) {
+ dev_err(&pdev->dev, "no irqs\n");
+ err = mvchip->irqbase;
+ goto err_gpiochip_add;
+ }
+
+ gc = irq_alloc_generic_chip("mvebu_gpio_irq", 2, mvchip->irqbase,
+ mvchip->membase, handle_level_irq);
+ if (!gc) {
+ dev_err(&pdev->dev, "Cannot allocate generic irq_chip\n");
+ err = -ENOMEM;
+ goto err_gpiochip_add;
+ }
+
+ gc->private = mvchip;
+ ct = &gc->chip_types[0];
+ ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
+ ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
+ ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
+ ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
+ ct->chip.name = mvchip->chip.label;
+
+ ct = &gc->chip_types[1];
+ ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+ ct->chip.irq_ack = mvebu_gpio_irq_ack;
+ ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
+ ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
+ ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
+ ct->handler = handle_edge_irq;
+ ct->chip.name = mvchip->chip.label;
+
+ irq_setup_generic_chip(gc, IRQ_MSK(ngpios), 0,
+ IRQ_NOREQUEST, IRQ_LEVEL | IRQ_NOPROBE);
+
+ /* Setup irq domain on top of the generic chip. */
+ mvchip->domain = irq_domain_add_simple(np, mvchip->chip.ngpio,
+ mvchip->irqbase,
+ &irq_domain_simple_ops,
+ mvchip);
+ if (!mvchip->domain) {
+ dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
+ mvchip->chip.label);
+ err = -ENODEV;
+ goto err_generic_chip;
+ }
+
+ return 0;
+
+err_generic_chip:
+ irq_remove_generic_chip(gc, IRQ_MSK(ngpios), IRQ_NOREQUEST,
+ IRQ_LEVEL | IRQ_NOPROBE);
+ kfree(gc);
+
+err_gpiochip_add:
+ gpiochip_remove(&mvchip->chip);
+
+ return err;
+}
+
+static struct platform_driver mvebu_gpio_driver = {
+ .driver = {
+ .name = "mvebu-gpio",
+ .of_match_table = mvebu_gpio_of_match,
+ },
+ .probe = mvebu_gpio_probe,
+ .suspend = mvebu_gpio_suspend,
+ .resume = mvebu_gpio_resume,
+};
+module_platform_driver(mvebu_gpio_driver);
Code Review / kvmfornfv.git / blobdiff