From: David Daney <david.da...@cavium.com>
Cavium ThunderX and OCTEON-TX are arm64 based SoCs. Add driver for
the on-chip GPIO pins.
Signed-off-by: David Daney <david.da...@cavium.com>
---
drivers/gpio/Kconfig | 8 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-thunderx.c | 487 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 496 insertions(+)
create mode 100644 drivers/gpio/gpio-thunderx.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d5d3654..e691a5e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -421,6 +421,14 @@ config GPIO_TS4800
help
This driver support TS-4800 FPGA GPIO controllers.
+config GPIO_THUNDERX
+ tristate "Cavium ThunderX/OCTEON-TX GPIO"
+ depends on ARCH_THUNDER || (64BIT && COMPILE_TEST)
+ select GPIOLIB_IRQCHIP
+ help
+ Say yes here to support the on-chip GPIO lines on the ThunderX
+ and OCTEON-TX families of SoCs.
+
config GPIO_TZ1090
bool "Toumaz Xenif TZ1090 GPIO support"
depends on SOC_TZ1090
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index a7676b8..c62bc72 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_GPIO_SYSCON) += gpio-syscon.o
obj-$(CONFIG_GPIO_TB10X) += gpio-tb10x.o
obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
obj-$(CONFIG_GPIO_TEGRA) += gpio-tegra.o
+obj-$(CONFIG_GPIO_THUNDERX) += gpio-thunderx.o
obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
diff --git a/drivers/gpio/gpio-thunderx.c b/drivers/gpio/gpio-thunderx.c
new file mode 100644
index 0000000..089d8d4
--- /dev/null
+++ b/drivers/gpio/gpio-thunderx.c
@@ -0,0 +1,487 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2016, 2017 Cavium Inc.
+ */
+
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+
+
+#define GPIO_RX_DAT 0x0
+#define GPIO_TX_SET 0x8
+#define GPIO_TX_CLR 0x10
+#define GPIO_CONST 0x90
+#define GPIO_CONST_GPIOS_MASK 0xff
+#define GPIO_BIT_CFG 0x400
+#define GPIO_BIT_CFG_TX_OE BIT(0)
+#define GPIO_BIT_CFG_PIN_XOR BIT(1)
+#define GPIO_BIT_CFG_INT_EN BIT(2)
+#define GPIO_BIT_CFG_INT_TYPE BIT(3)
+#define GPIO_BIT_CFG_FIL_CNT_SHIFT 4
+#define GPIO_BIT_CFG_FIL_SEL_SHIFT 8
+#define GPIO_BIT_CFG_TX_OD BIT(12)
+#define GPIO_BIT_CFG_PIN_SEL_MASK GENMASK(25, 16)
+#define GPIO_INTR 0x800
+#define GPIO_INTR_INTR BIT(0)
+#define GPIO_INTR_INTR_W1S BIT(1)
+#define GPIO_INTR_ENA_W1C BIT(2)
+#define GPIO_INTR_ENA_W1S BIT(3)
+#define GPIO_2ND_BANK 0x1400
+
+#define GLITCH_FILTER_400NS ((4ull << GPIO_BIT_CFG_FIL_SEL_SHIFT) | \
+ (9ull << GPIO_BIT_CFG_FIL_CNT_SHIFT))
+
+static unsigned int bit_cfg_reg(unsigned int line)
+{
+ return 8 * line + GPIO_BIT_CFG;
+}
+
+static unsigned int intr_reg(unsigned int line)
+{
+ return 8 * line + GPIO_INTR;
+}
+
+struct thunderx_gpio;
+
+struct thunderx_irqdev {
+ struct thunderx_gpio *gpio;
+ char *name;
+ unsigned int line;
+};
+
+struct thunderx_gpio {
+ struct gpio_chip chip;
+ u8 __iomem *register_base;
+ struct msix_entry *msix_entries;
+ struct thunderx_irqdev *irqdev_entries;
+ raw_spinlock_t lock;
+ unsigned long invert_mask[2];
+ unsigned long od_mask[2];
+ int base_msi;
+};
+
+
+/*
+ * Check (and WARN) that the pin is available for GPIO. We will not
+ * allow modification of the state of non-GPIO pins from this driver.
+ */
+static bool thunderx_gpio_is_gpio(struct thunderx_gpio *gpio,
+ unsigned int line)
+{
+ u64 bit_cfg = readq(gpio->register_base + bit_cfg_reg(line));
+ bool rv = (bit_cfg & GPIO_BIT_CFG_PIN_SEL_MASK) == 0;
+
+ WARN_RATELIMIT(!rv, "Pin %d not available for GPIO\n", line);
+
+ return rv;
+}
+
+static int thunderx_gpio_dir_in(struct gpio_chip *chip, unsigned int line)
+{
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+
+ if (!thunderx_gpio_is_gpio(gpio, line))
+ return -EIO;
+
+ raw_spin_lock(&gpio->lock);
+ clear_bit(line, gpio->invert_mask);
+ clear_bit(line, gpio->od_mask);
+ writeq(GLITCH_FILTER_400NS, gpio->register_base + bit_cfg_reg(line));
+ raw_spin_unlock(&gpio->lock);
+ return 0;
+}
+
+static void thunderx_gpio_set(struct gpio_chip *chip, unsigned int line,
+ int value)
+{
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ int bank = line / 64;
+ int bank_bit = line % 64;
+
+ void __iomem *reg = gpio->register_base +
+ (bank * GPIO_2ND_BANK) + (value ? GPIO_TX_SET : GPIO_TX_CLR);
+
+ writeq(1ull << bank_bit, reg);
+}
+
+static int thunderx_gpio_dir_out(struct gpio_chip *chip, unsigned int line,
+ int value)
+{
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ u64 bit_cfg = GPIO_BIT_CFG_TX_OE;
+
+ if (!thunderx_gpio_is_gpio(gpio, line))
+ return -EIO;
+
+ raw_spin_lock(&gpio->lock);
+
+ thunderx_gpio_set(chip, line, value);
+
+ if (test_bit(line, gpio->invert_mask))
+ bit_cfg |= GPIO_BIT_CFG_PIN_XOR;
+
+ if (test_bit(line, gpio->od_mask))
+ bit_cfg |= GPIO_BIT_CFG_TX_OD;
+
+ writeq(bit_cfg, gpio->register_base + bit_cfg_reg(line));
+
+ raw_spin_unlock(&gpio->lock);
+ return 0;
+}
+
+/*
+ * Weird, setting open-drain mode causes signal inversion. Note this
+ * so we can compensate in the dir_out function.
+ */
+static int thunderx_gpio_set_single_ended(struct gpio_chip *chip,
+ unsigned int line,
+ enum single_ended_mode mode)
+{
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+
+ if (mode == LINE_MODE_OPEN_SOURCE)
+ return -ENOTSUPP;
+
+ if (!thunderx_gpio_is_gpio(gpio, line))
+ return -EIO;
+
+ raw_spin_lock(&gpio->lock);
+ if (mode == LINE_MODE_OPEN_DRAIN) {
+ set_bit(line, gpio->invert_mask);
+ set_bit(line, gpio->od_mask);
+ } else {
+ clear_bit(line, gpio->invert_mask);
+ clear_bit(line, gpio->od_mask);
+ }
+ raw_spin_unlock(&gpio->lock);
+
+ return 0;
+}
+
+static int thunderx_gpio_get(struct gpio_chip *chip, unsigned int line)
+{
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ int bank = line / 64;
+ int bank_bit = line % 64;
+ u64 read_bits = readq(gpio->register_base + (bank * GPIO_2ND_BANK) +
GPIO_RX_DAT);
+
+ read_bits >>= bank_bit;
+
+ if (test_bit(line, gpio->invert_mask))
+ return !(read_bits & 1);
+ else
+ return read_bits & 1;
+}
+
+static void thunderx_gpio_set_multiple(struct gpio_chip *chip,
+ unsigned long *mask,
+ unsigned long *bits)
+{
+ int bank;
+ u64 set_bits, clear_bits;
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+
+ for (bank = 0; bank <= chip->ngpio / 64; bank++) {
+ set_bits = bits[bank] & mask[bank];
+ clear_bits = ~bits[bank] & mask[bank];
+ writeq(set_bits, gpio->register_base + (bank * GPIO_2ND_BANK) +
GPIO_TX_SET);
+ writeq(clear_bits, gpio->register_base + (bank * GPIO_2ND_BANK)
+ GPIO_TX_CLR);
+ }
+}
+
+static irqreturn_t thunderx_gpio_chain_handler(int irq, void *dev)
+{
+ struct thunderx_irqdev *irqdev = dev;
+ int chained_irq;
+ int ret;
+
+ chained_irq = irq_find_mapping(irqdev->gpio->chip.irqdomain,
+ irqdev->line);
+ if (!chained_irq)
+ return IRQ_NONE;
+
+ ret = generic_handle_irq(chained_irq);
+
+ return ret ? IRQ_NONE : IRQ_HANDLED;
+}
+
+static int thunderx_gpio_irq_request_resources(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+ struct thunderx_irqdev *irqdev;
+ int err;
+
+ if (!thunderx_gpio_is_gpio(gpio, line))
+ return -EIO;
+
+ irqdev = gpio->irqdev_entries + line;
+
+ irqdev->gpio = gpio;
+ irqdev->line = line;
+ irqdev->name = devm_kasprintf(chip->parent, GFP_KERNEL,
+ "gpio-%d", line + chip->base);
+
+ writeq(GPIO_INTR_ENA_W1C, gpio->register_base + intr_reg(line));
+
+ err = devm_request_irq(chip->parent, gpio->msix_entries[line].vector,
+ thunderx_gpio_chain_handler, IRQF_NO_THREAD,
irqdev->name, irqdev);
+ return err;
+}
+
+static void thunderx_gpio_irq_release_resources(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+ struct thunderx_irqdev *irqdev;
+
+ irqdev = gpio->irqdev_entries + line;
+
+ /*
+ * The request_resources/release_resources functions may be
+ * called multiple times in the lifitime of the driver, so we
+ * need to clean up the devm_* things to avoid a resource
+ * leak.
+ */
+ devm_free_irq(chip->parent, gpio->msix_entries[line].vector, irqdev);
+
+ writeq(GPIO_INTR_ENA_W1C, gpio->register_base + intr_reg(line));
+
+ devm_kfree(chip->parent, irqdev->name);
+}
+
+static void thunderx_gpio_irq_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+
+ writeq(GPIO_INTR_INTR,
+ gpio->register_base + intr_reg(line));
+}
+
+static void thunderx_gpio_irq_mask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+
+ writeq(GPIO_INTR_ENA_W1C, gpio->register_base + intr_reg(line));
+}
+
+static void thunderx_gpio_irq_mask_ack(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+
+ writeq(GPIO_INTR_ENA_W1C | GPIO_INTR_INTR,
+ gpio->register_base + intr_reg(line));
+}
+
+static void thunderx_gpio_irq_unmask(struct irq_data *data)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+
+ writeq(GPIO_INTR_ENA_W1S, gpio->register_base + intr_reg(line));
+}
+
+static int thunderx_gpio_irq_set_type(struct irq_data *data,
+ unsigned int flow_type)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+ struct thunderx_gpio *gpio = container_of(chip, struct thunderx_gpio,
chip);
+ unsigned int line = data->hwirq;
+ u64 bit_cfg;
+
+ irqd_set_trigger_type(data, flow_type);
+
+ bit_cfg = GLITCH_FILTER_400NS | GPIO_BIT_CFG_INT_EN;
+
+ if (flow_type & IRQ_TYPE_EDGE_BOTH) {
+ irq_set_handler_locked(data, handle_edge_irq);
+ bit_cfg |= GPIO_BIT_CFG_INT_TYPE;
+ } else {
+ irq_set_handler_locked(data, handle_level_irq);
+ }
+
+ raw_spin_lock(&gpio->lock);
+ if (flow_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)) {
+ bit_cfg |= GPIO_BIT_CFG_PIN_XOR;
+ set_bit(line, gpio->invert_mask);
+ } else {
+ clear_bit(line, gpio->invert_mask);
+ }
+ clear_bit(line, gpio->od_mask);
+ writeq(bit_cfg, gpio->register_base + bit_cfg_reg(line));
+ raw_spin_unlock(&gpio->lock);
+
+ return IRQ_SET_MASK_OK;
+}
+
+/*
+ * Interrupts are chained from underlying MSI-X vectors. We have
+ * these irq_chip functions to be able to handle level triggering
+ * semantics and other acknowledgment tasks associated with the GPIO
+ * mechanism.
+ */
+static struct irq_chip thunderx_gpio_irq_chip = {
+ .name = "GPIO",
+ .irq_enable = thunderx_gpio_irq_unmask,
+ .irq_disable = thunderx_gpio_irq_mask,
+ .irq_ack = thunderx_gpio_irq_ack,
+ .irq_mask = thunderx_gpio_irq_mask,
+ .irq_mask_ack = thunderx_gpio_irq_mask_ack,
+ .irq_unmask = thunderx_gpio_irq_unmask,
+ .irq_set_type = thunderx_gpio_irq_set_type,
+ .irq_request_resources = thunderx_gpio_irq_request_resources,
+ .irq_release_resources = thunderx_gpio_irq_release_resources,
+ .flags = IRQCHIP_SET_TYPE_MASKED
+};
+
+static int thunderx_gpio_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ void __iomem * const *tbl;
+ struct device *dev = &pdev->dev;
+ struct thunderx_gpio *gpio;
+ struct gpio_chip *chip;
+ int ngpio, i;
+ int err = 0;
+
+ gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ raw_spin_lock_init(&gpio->lock);
+ chip = &gpio->chip;
+
+ pci_set_drvdata(pdev, gpio);
+
+ err = pcim_enable_device(pdev);
+ if (err) {
+ dev_err(dev, "Failed to enable PCI device: err %d\n", err);
+ goto out;
+ }
+
+ err = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
+ if (err) {
+ dev_err(dev, "Failed to iomap PCI device: err %d\n", err);
+ goto out;
+ }
+
+ tbl = pcim_iomap_table(pdev);
+ gpio->register_base = tbl[0];
+ if (!gpio->register_base) {
+ dev_err(dev, "Cannot map PCI resource\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (pdev->subsystem_device == 0xa10a) {
+ /* CN88XX has no GPIO_CONST register*/
+ ngpio = 50;
+ gpio->base_msi = 48;
+ } else {
+ u64 c = readq(gpio->register_base + GPIO_CONST);
+
+ ngpio = c & GPIO_CONST_GPIOS_MASK;
+ gpio->base_msi = (c >> 8) & 0xff;
+ }
+
+ gpio->msix_entries = devm_kzalloc(dev,
+ sizeof(struct msix_entry) * ngpio,
+ GFP_KERNEL);
+ if (!gpio->msix_entries) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ gpio->irqdev_entries = devm_kzalloc(dev,
+ sizeof(struct thunderx_irqdev) *
ngpio,
+ GFP_KERNEL);
+ if (!gpio->irqdev_entries) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < ngpio; i++)
+ gpio->msix_entries[i].entry = gpio->base_msi + (2 * i);
+
+ err = pci_enable_msix(pdev, gpio->msix_entries, ngpio);
+ if (err < 0)
+ goto out;
+
+ chip->label = KBUILD_MODNAME;
+ chip->parent = dev;
+ chip->owner = THIS_MODULE;
+ chip->base = -1; /* System allocated */
+ chip->can_sleep = false;
+ chip->ngpio = ngpio;
+ chip->direction_input = thunderx_gpio_dir_in;
+ chip->get = thunderx_gpio_get;
+ chip->direction_output = thunderx_gpio_dir_out;
+ chip->set = thunderx_gpio_set;
+ chip->set_multiple = thunderx_gpio_set_multiple;
+ chip->set_single_ended = thunderx_gpio_set_single_ended;
+ err = gpiochip_add(chip);
+ if (err)
+ goto out;
+
+ err = gpiochip_irqchip_add(chip, &thunderx_gpio_irq_chip, 0,
+ handle_level_irq, IRQ_TYPE_NONE);
+ if (err) {
+ dev_err(dev, "gpiochip_irqchip_add failed: %d\n", err);
+ goto irqchip_out;
+ }
+
+ dev_info(dev, "ThunderX GPIO: %d lines with base %d.\n",
+ ngpio, chip->base);
+ return 0;
+
+irqchip_out:
+ gpiochip_remove(chip);
+out:
+ pci_set_drvdata(pdev, NULL);
+ return err;
+}
+
+static void thunderx_gpio_remove(struct pci_dev *pdev)
+{
+ struct thunderx_gpio *gpio = pci_get_drvdata(pdev);
+
+ gpiochip_remove(&gpio->chip);
+ pci_set_drvdata(pdev, NULL);
+}
+
+static const struct pci_device_id thunderx_gpio_id_table[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, 0xA00A) },
+ { 0, } /* end of table */
+};
+
+MODULE_DEVICE_TABLE(pci, thunderx_gpio_id_table);
+
+static struct pci_driver thunderx_gpio_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = thunderx_gpio_id_table,
+ .probe = thunderx_gpio_probe,
+ .remove = thunderx_gpio_remove,
+};
+
+module_pci_driver(thunderx_gpio_driver);
+
+MODULE_DESCRIPTION("Cavium Inc. ThunderX/OCTEON-TX GPIO Driver");
+MODULE_LICENSE("GPL");
--
1.8.3.1
