[PATCH 07/10] gpio: ptxpmb-cpld: Add support for PTXPMB CPLD's GPIO
Pantelis Antoniou
pantelis.antoniou at konsulko.com
Fri Oct 7 08:17:28 PDT 2016
From: Guenter Roeck <groeck at juniper.net>
Support the GPIO block which is located in PTXPMB CPLDs
on relevant Juniper platforms.
Signed-off-by: Georgi Vlaev <gvlaev at juniper.net>
Signed-off-by: Guenter Roeck <groeck at juniper.net>
Signed-off-by: Rajat Jain <rajatjain at juniper.net>
[Ported from Juniper kernel]
Signed-off-by: Pantelis Antoniou <pantelis.antoniou at konsulko.com>
---
drivers/gpio/Kconfig | 11 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-ptxpmb-cpld.c | 177 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 189 insertions(+)
create mode 100644 drivers/gpio/gpio-ptxpmb-cpld.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 26ee00f..9c91de6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -360,6 +360,17 @@ config GPIO_PL061
help
Say yes here to support the PrimeCell PL061 GPIO device
+config GPIO_PTXPMB_CPLD
+ tristate "PTXPMB CPLD GPIO"
+ depends on MFD_JUNIPER_CPLD
+ default y if MFD_JUNIPER_CPLD
+ help
+ This driver supports the GPIO interfaces on the PTXPMB CPLD which is
+ present on the relevant Juniper platforms.
+
+ This driver can also be built as a module. If so, the module
+ will be called gpio-ptxpmb-cpld.
+
config GPIO_PXA
bool "PXA GPIO support"
depends on ARCH_PXA || ARCH_MMP
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ab28a2d..d397ea5 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -90,6 +90,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o
obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
+obj-$(CONFIG_GPIO_PTXPMB_CPLD) += gpio-ptxpmb-cpld.o
obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
diff --git a/drivers/gpio/gpio-ptxpmb-cpld.c b/drivers/gpio/gpio-ptxpmb-cpld.c
new file mode 100644
index 0000000..e6fab7c
--- /dev/null
+++ b/drivers/gpio/gpio-ptxpmb-cpld.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2012 Juniper networks
+ *
+ * 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; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/gpio.h>
+#include <linux/errno.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+#include <linux/mfd/ptxpmb_cpld.h>
+
+/**
+ * struct ptxpmb_cpld_gpio - GPIO private data structure.
+ * @base: PCI base address of Memory mapped I/O register.
+ * @dev: Pointer to device structure.
+ * @gpio: Data for GPIO infrastructure.
+ */
+struct ptxpmb_cpld_gpio {
+ void __iomem *base;
+ struct device *dev;
+ struct gpio_chip gpio;
+ struct mutex lock;
+};
+
+static u8 *ptxpmb_cpld_gpio_get_addr(struct pmb_boot_cpld *cpld,
+ unsigned int nr)
+{
+ if (nr < 8) /* 0..7: reset */
+ return &cpld->reset;
+ else if (nr < 16) /* 8..15: control */
+ return &cpld->control;
+ else if (nr < 24) /* 16..23: gpio1 */
+ return &cpld->gpio_1;
+ else if (nr < 32) /* 24..31: gpio2 */
+ return &cpld->gpio_2;
+ else if (nr < 40) /* 32..39: gp_reset1 */
+ return &cpld->gp_reset1;
+ return &cpld->thermal_status; /* 40..41: thermal status */
+}
+
+static void ptxpmb_cpld_gpio_set(struct gpio_chip *gpio, unsigned int nr,
+ int val)
+{
+ u32 reg;
+ u8 bit = 1 << (nr & 7);
+ struct ptxpmb_cpld_gpio *chip =
+ container_of(gpio, struct ptxpmb_cpld_gpio, gpio);
+ u8 *addr = ptxpmb_cpld_gpio_get_addr(chip->base, nr);
+
+ mutex_lock(&chip->lock);
+ reg = ioread8(addr);
+ if (val)
+ reg |= bit;
+ else
+ reg &= ~bit;
+
+ iowrite8(reg, addr);
+ mutex_unlock(&chip->lock);
+}
+
+static int ptxpmb_cpld_gpio_get(struct gpio_chip *gpio, unsigned int nr)
+{
+ struct ptxpmb_cpld_gpio *chip = container_of(gpio,
+ struct ptxpmb_cpld_gpio,
+ gpio);
+ u8 *addr = ptxpmb_cpld_gpio_get_addr(chip->base, nr);
+ u8 bit = 1 << (nr & 7);
+
+ return !!(ioread8(addr) & bit);
+}
+
+static int ptxpmb_cpld_gpio_direction_output(struct gpio_chip *gpio,
+ unsigned int nr, int val)
+{
+ return 0;
+}
+
+static int ptxpmb_cpld_gpio_direction_input(struct gpio_chip *gpio,
+ unsigned int nr)
+{
+ return 0;
+}
+
+static void ptxpmb_cpld_gpio_setup(struct ptxpmb_cpld_gpio *chip)
+{
+ struct gpio_chip *gpio = &chip->gpio;
+
+ gpio->label = dev_name(chip->dev);
+ gpio->owner = THIS_MODULE;
+ gpio->direction_input = ptxpmb_cpld_gpio_direction_input;
+ gpio->get = ptxpmb_cpld_gpio_get;
+ gpio->direction_output = ptxpmb_cpld_gpio_direction_output;
+ gpio->set = ptxpmb_cpld_gpio_set;
+ gpio->dbg_show = NULL;
+ gpio->base = -1;
+ gpio->ngpio = 48;
+ gpio->can_sleep = 0;
+#ifdef CONFIG_OF_GPIO
+ gpio->of_node = chip->dev->of_node;
+#endif
+}
+
+static int ptxpmb_cpld_gpio_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct ptxpmb_cpld_gpio *chip;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (chip == NULL)
+ return -ENOMEM;
+
+ chip->dev = dev;
+ platform_set_drvdata(pdev, chip);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ chip->base = devm_ioremap_nocache(dev, res->start, resource_size(res));
+ if (!chip->base)
+ return -ENOMEM;
+
+ mutex_init(&chip->lock);
+ ptxpmb_cpld_gpio_setup(chip);
+ ret = gpiochip_add(&chip->gpio);
+ if (ret) {
+ dev_err(dev, "CPLD gpio: Failed to register GPIO\n");
+ return ret;
+ }
+ return 0;
+}
+
+static int ptxpmb_cpld_gpio_remove(struct platform_device *pdev)
+{
+ struct ptxpmb_cpld_gpio *chip = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&chip->gpio);
+
+ return 0;
+}
+
+static const struct of_device_id ptxpmb_cpld_gpio_ids[] = {
+ { .compatible = "jnx,gpio-ptxpmb-cpld", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ptxpmb_cpld_gpio_ids);
+
+static struct platform_driver ptxpmb_cpld_gpio_driver = {
+ .driver = {
+ .name = "gpio-ptxpmb-cpld",
+ .owner = THIS_MODULE,
+ .of_match_table = ptxpmb_cpld_gpio_ids,
+ },
+ .probe = ptxpmb_cpld_gpio_probe,
+ .remove = ptxpmb_cpld_gpio_remove,
+};
+
+module_platform_driver(ptxpmb_cpld_gpio_driver);
+
+MODULE_DESCRIPTION("CPLD FPGA GPIO Driver");
+MODULE_LICENSE("GPL");
--
1.9.1
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