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Message-Id: <1484864602-5266-1-git-send-email-sudipm.mukherjee@gmail.com>
Date: Thu, 19 Jan 2017 22:23:20 +0000
From: Sudip Mukherjee <sudipm.mukherjee@...il.com>
To: Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.com>,
Andy Shevchenko <andy.shevchenko@...il.com>,
gnomes@...rguk.ukuu.org.uk
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
linux-gpio@...r.kernel.org
Subject: [PATCH v10 1/3] gpio: exar: add gpio for exar cards
From: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
Exar XR17V352/354/358 chips have 16 multi-purpose inputs/outputs which
can be controlled using gpio interface.
Add the gpio specific code.
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
drivers/gpio/Kconfig | 7 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-exar.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 208 insertions(+)
create mode 100644 drivers/gpio/gpio-exar.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ed37e59..89033d6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -185,6 +185,13 @@ config GPIO_ETRAXFS
help
Say yes here to support the GPIO controller on Axis ETRAX FS SoCs.
+config GPIO_EXAR
+ tristate "Support for GPIO pins on XR17V352/354/358"
+ depends on SERIAL_8250_EXAR
+ help
+ Selecting this option will enable handling of GPIO pins present
+ on Exar XR17V352/354/358 chips.
+
config GPIO_GE_FPGA
bool "GE FPGA based GPIO"
depends on GE_FPGA
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d074c22..d4d44f8 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_GPIO_DWAPB) += gpio-dwapb.o
obj-$(CONFIG_GPIO_EM) += gpio-em.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
obj-$(CONFIG_GPIO_ETRAXFS) += gpio-etraxfs.o
+obj-$(CONFIG_GPIO_EXAR) += gpio-exar.o
obj-$(CONFIG_GPIO_F7188X) += gpio-f7188x.o
obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o
obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o
diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
new file mode 100644
index 0000000..05c8946
--- /dev/null
+++ b/drivers/gpio/gpio-exar.c
@@ -0,0 +1,200 @@
+/*
+ * GPIO driver for Exar XR17V35X chip
+ *
+ * Copyright (C) 2015 Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#define EXAR_OFFSET_MPIOLVL_LO 0x90
+#define EXAR_OFFSET_MPIOSEL_LO 0x93
+#define EXAR_OFFSET_MPIOLVL_HI 0x96
+#define EXAR_OFFSET_MPIOSEL_HI 0x99
+
+#define DRIVER_NAME "gpio_exar"
+
+static DEFINE_IDA(ida_index);
+
+struct exar_gpio_chip {
+ struct gpio_chip gpio_chip;
+ struct mutex lock;
+ int index;
+ void __iomem *regs;
+ char name[20];
+};
+
+static void exar_update(struct gpio_chip *chip, unsigned int reg, int val,
+ unsigned int offset)
+{
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ int temp;
+
+ mutex_lock(&exar_gpio->lock);
+ temp = readb(exar_gpio->regs + reg);
+ temp &= ~BIT(offset);
+ if (val)
+ temp |= BIT(offset);
+ writeb(temp, exar_gpio->regs + reg);
+ mutex_unlock(&exar_gpio->lock);
+}
+
+static int exar_set_direction(struct gpio_chip *chip, int direction,
+ unsigned int offset)
+{
+ unsigned int bank = offset / 8;
+ unsigned int addr;
+
+ addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
+ exar_update(chip, addr, direction, offset % 8);
+ return 0;
+}
+
+static int exar_direction_output(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ return exar_set_direction(chip, 0, offset);
+}
+
+static int exar_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+ return exar_set_direction(chip, 1, offset);
+}
+
+static int exar_get(struct gpio_chip *chip, unsigned int reg)
+{
+ struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
+ int value;
+
+ mutex_lock(&exar_gpio->lock);
+ value = readb(exar_gpio->regs + reg);
+ mutex_unlock(&exar_gpio->lock);
+
+ return !!value;
+}
+
+static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+ unsigned int bank = offset / 8;
+ unsigned int addr;
+ int val;
+
+ addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
+ val = exar_get(chip, addr) >> (offset % 8);
+
+ return !!val;
+}
+
+static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
+{
+ unsigned int bank = offset / 8;
+ unsigned int addr;
+ int val;
+
+ addr = bank ? EXAR_OFFSET_MPIOLVL_LO : EXAR_OFFSET_MPIOLVL_HI;
+ val = exar_get(chip, addr) >> (offset % 8);
+
+ return !!val;
+}
+
+static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ unsigned int bank = offset / 8;
+ unsigned int addr;
+
+ addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
+ exar_update(chip, addr, value, offset % 8);
+}
+
+static int gpio_exar_probe(struct platform_device *pdev)
+{
+ struct pci_dev *pcidev = platform_get_drvdata(pdev);
+ struct exar_gpio_chip *exar_gpio;
+ void __iomem *p;
+ int index, ret;
+
+ if (pcidev->vendor != PCI_VENDOR_ID_EXAR)
+ return -ENODEV;
+
+ /*
+ * Map the pci device to get the register addresses.
+ * We will need to read and write those registers to control
+ * the GPIO pins.
+ * Using managed functions will save us from unmaping on exit.
+ * As the device is enabled using managed functions by the
+ * UART driver we can also use managed functions here.
+ */
+ p = pcim_iomap(pcidev, 0, 0);
+ if (!p)
+ return -ENOMEM;
+
+ exar_gpio = devm_kzalloc(&pcidev->dev, sizeof(*exar_gpio), GFP_KERNEL);
+ if (!exar_gpio)
+ return -ENOMEM;
+
+ mutex_init(&exar_gpio->lock);
+
+ index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
+
+ sprintf(exar_gpio->name, "exar_gpio%d", index);
+ exar_gpio->gpio_chip.label = exar_gpio->name;
+ exar_gpio->gpio_chip.parent = &pcidev->dev;
+ exar_gpio->gpio_chip.direction_output = exar_direction_output;
+ exar_gpio->gpio_chip.direction_input = exar_direction_input;
+ exar_gpio->gpio_chip.get_direction = exar_get_direction;
+ exar_gpio->gpio_chip.get = exar_get_value;
+ exar_gpio->gpio_chip.set = exar_set_value;
+ exar_gpio->gpio_chip.base = -1;
+ exar_gpio->gpio_chip.ngpio = 16;
+ exar_gpio->regs = p;
+ exar_gpio->index = index;
+
+ ret = devm_gpiochip_add_data(&pcidev->dev,
+ &exar_gpio->gpio_chip, exar_gpio);
+ if (ret)
+ goto err_destroy;
+
+ platform_set_drvdata(pdev, exar_gpio);
+
+ return 0;
+
+err_destroy:
+ ida_simple_remove(&ida_index, index);
+ mutex_destroy(&exar_gpio->lock);
+ return ret;
+}
+
+static int gpio_exar_remove(struct platform_device *pdev)
+{
+ struct exar_gpio_chip *exar_gpio = platform_get_drvdata(pdev);
+
+ ida_simple_remove(&ida_index, exar_gpio->index);
+ mutex_destroy(&exar_gpio->lock);
+
+ return 0;
+}
+
+static struct platform_driver gpio_exar_driver = {
+ .probe = gpio_exar_probe,
+ .remove = gpio_exar_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+module_platform_driver(gpio_exar_driver);
+
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_DESCRIPTION("Exar GPIO driver");
+MODULE_AUTHOR("Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>");
+MODULE_LICENSE("GPL");
--
1.9.1
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