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path: root/drivers/gpio/xilinx_gpio.c
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Diffstat (limited to 'drivers/gpio/xilinx_gpio.c')
-rw-r--r--drivers/gpio/xilinx_gpio.c364
1 files changed, 364 insertions, 0 deletions
diff --git a/drivers/gpio/xilinx_gpio.c b/drivers/gpio/xilinx_gpio.c
new file mode 100644
index 000000000..37fb0c50b
--- /dev/null
+++ b/drivers/gpio/xilinx_gpio.c
@@ -0,0 +1,364 @@
+/*
+ * Copyright (c) 2013 Xilinx, Michal Simek
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <linux/list.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+static LIST_HEAD(gpio_list);
+
+enum gpio_direction {
+ GPIO_DIRECTION_OUT = 0,
+ GPIO_DIRECTION_IN = 1,
+};
+
+/* Gpio simple map */
+struct gpio_regs {
+ u32 gpiodata;
+ u32 gpiodir;
+};
+
+#define GPIO_NAME_SIZE 10
+
+struct gpio_names {
+ char name[GPIO_NAME_SIZE];
+};
+
+/* Initialized, rxbd_current, rx_first_buf must be 0 after init */
+struct xilinx_gpio_priv {
+ struct gpio_regs *regs;
+ u32 gpio_min;
+ u32 gpio_max;
+ u32 gpiodata_store;
+ char name[GPIO_NAME_SIZE];
+ struct list_head list;
+ struct gpio_names *gpio_name;
+};
+
+/* Store number of allocated gpio pins */
+static u32 xilinx_gpio_max;
+
+/* Get associated gpio controller */
+static struct xilinx_gpio_priv *gpio_get_controller(unsigned gpio)
+{
+ struct list_head *entry;
+ struct xilinx_gpio_priv *priv = NULL;
+
+ list_for_each(entry, &gpio_list) {
+ priv = list_entry(entry, struct xilinx_gpio_priv, list);
+ if (gpio >= priv->gpio_min && gpio <= priv->gpio_max) {
+ debug("%s: reg: %x, min-max: %d-%d\n", __func__,
+ (u32)priv->regs, priv->gpio_min, priv->gpio_max);
+ return priv;
+ }
+ }
+ puts("!!!Can't get gpio controller!!!\n");
+ return NULL;
+}
+
+/* Get gpio pin name if used/setup */
+static char *get_name(unsigned gpio)
+{
+ u32 gpio_priv;
+ struct xilinx_gpio_priv *priv;
+
+ debug("%s\n", __func__);
+
+ priv = gpio_get_controller(gpio);
+ if (priv) {
+ gpio_priv = gpio - priv->gpio_min;
+
+ return *priv->gpio_name[gpio_priv].name ?
+ priv->gpio_name[gpio_priv].name : "UNKNOWN";
+ }
+ return "UNKNOWN";
+}
+
+/* Get output value */
+static int gpio_get_output_value(unsigned gpio)
+{
+ u32 val, gpio_priv;
+ struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
+
+ if (priv) {
+ gpio_priv = gpio - priv->gpio_min;
+ val = !!(priv->gpiodata_store & (1 << gpio_priv));
+ debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
+ (u32)priv->regs, gpio_priv, val);
+
+ return val;
+ }
+ return -1;
+}
+
+/* Get input value */
+static int gpio_get_input_value(unsigned gpio)
+{
+ u32 val, gpio_priv;
+ struct gpio_regs *regs;
+ struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
+
+ if (priv) {
+ regs = priv->regs;
+ gpio_priv = gpio - priv->gpio_min;
+ val = readl(&regs->gpiodata);
+ val = !!(val & (1 << gpio_priv));
+ debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
+ (u32)priv->regs, gpio_priv, val);
+
+ return val;
+ }
+ return -1;
+}
+
+/* Set gpio direction */
+static int gpio_set_direction(unsigned gpio, enum gpio_direction direction)
+{
+ u32 val, gpio_priv;
+ struct gpio_regs *regs;
+ struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
+
+ if (priv) {
+ regs = priv->regs;
+ val = readl(&regs->gpiodir);
+
+ gpio_priv = gpio - priv->gpio_min;
+ if (direction == GPIO_DIRECTION_OUT)
+ val &= ~(1 << gpio_priv);
+ else
+ val |= 1 << gpio_priv;
+
+ writel(val, &regs->gpiodir);
+ debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
+ (u32)priv->regs, gpio_priv, val);
+
+ return 0;
+ }
+
+ return -1;
+}
+
+/* Get gpio direction */
+static int gpio_get_direction(unsigned gpio)
+{
+ u32 val, gpio_priv;
+ struct gpio_regs *regs;
+ struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
+
+ if (priv) {
+ regs = priv->regs;
+ gpio_priv = gpio - priv->gpio_min;
+ val = readl(&regs->gpiodir);
+ val = !!(val & (1 << gpio_priv));
+ debug("%s: reg: %x, gpio_no: %d, dir: %d\n", __func__,
+ (u32)priv->regs, gpio_priv, val);
+
+ return val;
+ }
+
+ return -1;
+}
+
+/*
+ * Get input value
+ * for example gpio setup to output only can't get input value
+ * which is breaking gpio toggle command
+ */
+int gpio_get_value(unsigned gpio)
+{
+ u32 val;
+
+ if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
+ val = gpio_get_output_value(gpio);
+ else
+ val = gpio_get_input_value(gpio);
+
+ return val;
+}
+
+/* Set output value */
+static int gpio_set_output_value(unsigned gpio, int value)
+{
+ u32 val, gpio_priv;
+ struct gpio_regs *regs;
+ struct xilinx_gpio_priv *priv = gpio_get_controller(gpio);
+
+ if (priv) {
+ regs = priv->regs;
+ gpio_priv = gpio - priv->gpio_min;
+ val = priv->gpiodata_store;
+ if (value)
+ val |= 1 << gpio_priv;
+ else
+ val &= ~(1 << gpio_priv);
+
+ writel(val, &regs->gpiodata);
+ debug("%s: reg: %x, gpio_no: %d, output_val: %d\n", __func__,
+ (u32)priv->regs, gpio_priv, val);
+ priv->gpiodata_store = val;
+
+ return 0;
+ }
+
+ return -1;
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+ if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
+ return gpio_set_output_value(gpio, value);
+
+ return -1;
+}
+
+/* Set GPIO as input */
+int gpio_direction_input(unsigned gpio)
+{
+ debug("%s\n", __func__);
+ return gpio_set_direction(gpio, GPIO_DIRECTION_IN);
+}
+
+/* Setup GPIO as output and set output value */
+int gpio_direction_output(unsigned gpio, int value)
+{
+ int ret = gpio_set_direction(gpio, GPIO_DIRECTION_OUT);
+
+ debug("%s\n", __func__);
+
+ if (ret < 0)
+ return ret;
+
+ return gpio_set_output_value(gpio, value);
+}
+
+/* Show gpio status */
+void gpio_info(void)
+{
+ unsigned gpio;
+
+ struct list_head *entry;
+ struct xilinx_gpio_priv *priv = NULL;
+
+ list_for_each(entry, &gpio_list) {
+ priv = list_entry(entry, struct xilinx_gpio_priv, list);
+ printf("\n%s: %s/%x (%d-%d)\n", __func__, priv->name,
+ (u32)priv->regs, priv->gpio_min, priv->gpio_max);
+
+ for (gpio = priv->gpio_min; gpio <= priv->gpio_max; gpio++) {
+ printf("GPIO_%d:\t%s is an ", gpio, get_name(gpio));
+ if (gpio_get_direction(gpio) == GPIO_DIRECTION_OUT)
+ printf("OUTPUT value = %d\n",
+ gpio_get_output_value(gpio));
+ else
+ printf("INPUT value = %d\n",
+ gpio_get_input_value(gpio));
+ }
+ }
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+ u32 gpio_priv;
+ struct xilinx_gpio_priv *priv;
+
+ if (gpio >= xilinx_gpio_max)
+ return -EINVAL;
+
+ priv = gpio_get_controller(gpio);
+ if (priv) {
+ gpio_priv = gpio - priv->gpio_min;
+
+ if (label != NULL) {
+ strncpy(priv->gpio_name[gpio_priv].name, label,
+ GPIO_NAME_SIZE);
+ priv->gpio_name[gpio_priv].name[GPIO_NAME_SIZE - 1] =
+ '\0';
+ }
+ return 0;
+ }
+
+ return -1;
+}
+
+int gpio_free(unsigned gpio)
+{
+ u32 gpio_priv;
+ struct xilinx_gpio_priv *priv;
+
+ if (gpio >= xilinx_gpio_max)
+ return -EINVAL;
+
+ priv = gpio_get_controller(gpio);
+ if (priv) {
+ gpio_priv = gpio - priv->gpio_min;
+ priv->gpio_name[gpio_priv].name[0] = '\0';
+
+ /* Do nothing here */
+ return 0;
+ }
+
+ return -1;
+}
+
+int gpio_alloc(u32 baseaddr, const char *name, u32 gpio_no)
+{
+ struct xilinx_gpio_priv *priv;
+
+ priv = calloc(1, sizeof(struct xilinx_gpio_priv));
+
+ /* Setup gpio name */
+ if (name != NULL) {
+ strncpy(priv->name, name, GPIO_NAME_SIZE);
+ priv->name[GPIO_NAME_SIZE - 1] = '\0';
+ }
+ priv->regs = (struct gpio_regs *)baseaddr;
+
+ priv->gpio_min = xilinx_gpio_max;
+ xilinx_gpio_max = priv->gpio_min + gpio_no;
+ priv->gpio_max = xilinx_gpio_max - 1;
+
+ priv->gpio_name = calloc(gpio_no, sizeof(struct gpio_names));
+
+ INIT_LIST_HEAD(&priv->list);
+ list_add_tail(&priv->list, &gpio_list);
+
+ printf("%s: Add %s (%d-%d)\n", __func__, name,
+ priv->gpio_min, priv->gpio_max);
+
+ /* Return the first gpio allocated for this device */
+ return priv->gpio_min;
+}
+
+/* Dual channel gpio is one IP with two independent channels */
+int gpio_alloc_dual(u32 baseaddr, const char *name, u32 gpio_no0, u32 gpio_no1)
+{
+ int ret;
+
+ ret = gpio_alloc(baseaddr, name, gpio_no0);
+ gpio_alloc(baseaddr + 8, strcat((char *)name, "_1"), gpio_no1);
+
+ /* Return the first gpio allocated for this device */
+ return ret;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-10-31 02:52:27 +0000