gpio: Move GE GPIO driver to reside within GPIO subsystem

The GE GPIO driver provides basic support (set direction, read/write state)
for the GPIO provided on some GE single board computers. This patch moves
the driver from the 86xx specific platform directrory to the GPIO subsystem
so that it can be used on non-86xx boards.

Signed-off-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-ge.c b/drivers/gpio/gpio-ge.c
new file mode 100644
index 000000000000..f8e628952921
--- /dev/null
+++ b/drivers/gpio/gpio-ge.c
@@ -0,0 +1,171 @@
+/*
+ * Driver for GE FPGA based GPIO
+ *
+ * Author: Martyn Welch <martyn.welch@ge.com>
+ *
+ * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
+ *
+ * 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.
+ */
+
+/* TODO
+ *
+ * Configuration of output modes (totem-pole/open-drain)
+ * Interrupt configuration - interrupts are always generated the FPGA relies on
+ * the I/O interrupt controllers mask to stop them propergating
+ */
+
+#include <linux/kernel.h>
+#include <linux/compiler.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#define GEF_GPIO_DIRECT         0x00
+#define GEF_GPIO_IN             0x04
+#define GEF_GPIO_OUT            0x08
+#define GEF_GPIO_TRIG           0x0C
+#define GEF_GPIO_POLAR_A        0x10
+#define GEF_GPIO_POLAR_B        0x14
+#define GEF_GPIO_INT_STAT       0x18
+#define GEF_GPIO_OVERRUN        0x1C
+#define GEF_GPIO_MODE           0x20
+
+static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
+{
+        unsigned int data;
+
+        data = ioread32be(reg);
+        /* value: 0=low; 1=high */
+        if (value & 0x1)
+                data = data | (0x1 << offset);
+        else
+                data = data & ~(0x1 << offset);
+
+        iowrite32be(data, reg);
+}
+
+
+static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
+{
+        unsigned int data;
+        struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
+
+        data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
+        data = data | (0x1 << offset);
+        iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
+
+        return 0;
+}
+
+static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
+{
+        unsigned int data;
+        struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
+
+        /* Set direction before switching to input */
+        _gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
+
+        data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
+        data = data & ~(0x1 << offset);
+        iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
+
+        return 0;
+}
+
+static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+        unsigned int data;
+        int state = 0;
+        struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
+
+        data = ioread32be(mmchip->regs + GEF_GPIO_IN);
+        state = (int)((data >> offset) & 0x1);
+
+        return state;
+}
+
+static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+        struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
+
+        _gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
+}
+
+static int __init gef_gpio_init(void)
+{
+        struct device_node *np;
+        int retval;
+        struct of_mm_gpio_chip *gef_gpio_chip;
+
+        for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
+
+                pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
+
+                /* Allocate chip structure */
+                gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
+                if (!gef_gpio_chip) {
+                        pr_err("%s: Unable to allocate structure\n",
+                                np->full_name);
+                        continue;
+                }
+
+                /* Setup pointers to chip functions */
+                gef_gpio_chip->gc.of_gpio_n_cells = 2;
+                gef_gpio_chip->gc.ngpio = 19;
+                gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
+                gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
+                gef_gpio_chip->gc.get = gef_gpio_get;
+                gef_gpio_chip->gc.set = gef_gpio_set;
+
+                /* This function adds a memory mapped GPIO chip */
+                retval = of_mm_gpiochip_add(np, gef_gpio_chip);
+                if (retval) {
+                        kfree(gef_gpio_chip);
+                        pr_err("%s: Unable to add GPIO\n", np->full_name);
+                }
+        }
+
+        for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
+
+                pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
+
+                /* Allocate chip structure */
+                gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
+                if (!gef_gpio_chip) {
+                        pr_err("%s: Unable to allocate structure\n",
+                                np->full_name);
+                        continue;
+                }
+
+                /* Setup pointers to chip functions */
+                gef_gpio_chip->gc.of_gpio_n_cells = 2;
+                gef_gpio_chip->gc.ngpio = 6;
+                gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
+                gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
+                gef_gpio_chip->gc.get = gef_gpio_get;
+                gef_gpio_chip->gc.set = gef_gpio_set;
+
+                /* This function adds a memory mapped GPIO chip */
+                retval = of_mm_gpiochip_add(np, gef_gpio_chip);
+                if (retval) {
+                        kfree(gef_gpio_chip);
+                        pr_err("%s: Unable to add GPIO\n", np->full_name);
+                }
+        }
+
+        return 0;
+};
+arch_initcall(gef_gpio_init);
+
+MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
+MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
+MODULE_LICENSE("GPL");