msm: add tlmm support for gpio.

GPIO support for Qualcomm SOCs requires interaction with the
radio (baseband processor). This API allows the different boards
to enable GPIO through the radio processor in a generic way.

Signed-off-by: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>

2 files changed, 227 insertions, 0 deletions

diff --git a/arch/arm/mach-msm/gpio.c b/arch/arm/mach-msm/gpio.c
new file mode 100644
index 000000000000..bc32c845c7b0
--- /dev/null
+++ b/arch/arm/mach-msm/gpio.c
@@ -0,0 +1,85 @@
+/* linux/arch/arm/mach-msm/gpio.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009, Code Aurora Forum. All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/module.h>
+#include <mach/gpio.h>
+#include "proc_comm.h"
+
+int gpio_tlmm_config(unsigned config, unsigned disable)
+{
+        return msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX, &config, &disable);
+}
+EXPORT_SYMBOL(gpio_tlmm_config);
+
+int msm_gpios_enable(const struct msm_gpio *table, int size)
+{
+        int rc;
+        int i;
+        const struct msm_gpio *g;
+        for (i = 0; i < size; i++) {
+                g = table + i;
+                rc = gpio_tlmm_config(g->gpio_cfg, GPIO_ENABLE);
+                if (rc) {
+                        pr_err("gpio_tlmm_config(0x%08x, GPIO_ENABLE)"
+                               " <%s> failed: %d\n",
+                               g->gpio_cfg, g->label ?: "?", rc);
+                        pr_err("pin %d func %d dir %d pull %d drvstr %d\n",
+                               GPIO_PIN(g->gpio_cfg), GPIO_FUNC(g->gpio_cfg),
+                               GPIO_DIR(g->gpio_cfg), GPIO_PULL(g->gpio_cfg),
+                               GPIO_DRVSTR(g->gpio_cfg));
+                        goto err;
+                }
+        }
+        return 0;
+err:
+        msm_gpios_disable(table, i);
+        return rc;
+}
+EXPORT_SYMBOL(msm_gpios_enable);
+
+void msm_gpios_disable(const struct msm_gpio *table, int size)
+{
+        int rc;
+        int i;
+        const struct msm_gpio *g;
+        for (i = size-1; i >= 0; i--) {
+                g = table + i;
+                rc = gpio_tlmm_config(g->gpio_cfg, GPIO_DISABLE);
+                if (rc) {
+                        pr_err("gpio_tlmm_config(0x%08x, GPIO_DISABLE)"
+                               " <%s> failed: %d\n",
+                               g->gpio_cfg, g->label ?: "?", rc);
+                        pr_err("pin %d func %d dir %d pull %d drvstr %d\n",
+                               GPIO_PIN(g->gpio_cfg), GPIO_FUNC(g->gpio_cfg),
+                               GPIO_DIR(g->gpio_cfg), GPIO_PULL(g->gpio_cfg),
+                               GPIO_DRVSTR(g->gpio_cfg));
+                }
+        }
+}
+EXPORT_SYMBOL(msm_gpios_disable);
+
+int msm_gpios_request_enable(const struct msm_gpio *table, int size)
+{
+        int rc = msm_gpios_enable(table, size);
+        return rc;
+}
+EXPORT_SYMBOL(msm_gpios_request_enable);
+
+void msm_gpios_disable_free(const struct msm_gpio *table, int size)
+{
+        msm_gpios_disable(table, size);
+}
+EXPORT_SYMBOL(msm_gpios_disable_free);
diff --git a/arch/arm/mach-msm/include/mach/gpio.h b/arch/arm/mach-msm/include/mach/gpio.h
new file mode 100644
index 000000000000..262b441b4374
--- /dev/null
+++ b/arch/arm/mach-msm/include/mach/gpio.h
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009-2010, Code Aurora Forum. All rights reserved.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+#ifndef __ASM_ARCH_MSM_GPIO_H
+#define __ASM_ARCH_MSM_GPIO_H
+
+/**
+ * struct msm_gpio - GPIO pin description
+ * @gpio_cfg - configuration bitmap, as per gpio_tlmm_config()
+ * @label - textual label
+ *
+ * Usually, GPIO's are operated by sets.
+ * This struct accumulate all GPIO information in single source
+ * and facilitete group operations provided by msm_gpios_xxx()
+ */
+struct msm_gpio {
+        u32 gpio_cfg;
+        const char *label;
+};
+
+/**
+ * msm_gpios_request_enable() - request and enable set of GPIOs
+ *
+ * Request and configure set of GPIO's
+ * In case of error, all operations rolled back.
+ * Return error code.
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+int msm_gpios_request_enable(const struct msm_gpio *table, int size);
+
+/**
+ * msm_gpios_disable_free() - disable and free set of GPIOs
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+void msm_gpios_disable_free(const struct msm_gpio *table, int size);
+
+/**
+ * msm_gpios_request() - request set of GPIOs
+ * In case of error, all operations rolled back.
+ * Return error code.
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+int msm_gpios_request(const struct msm_gpio *table, int size);
+
+/**
+ * msm_gpios_free() - free set of GPIOs
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+void msm_gpios_free(const struct msm_gpio *table, int size);
+
+/**
+ * msm_gpios_enable() - enable set of GPIOs
+ * In case of error, all operations rolled back.
+ * Return error code.
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+int msm_gpios_enable(const struct msm_gpio *table, int size);
+
+/**
+ * msm_gpios_disable() - disable set of GPIOs
+ *
+ * @table: GPIO table
+ * @size:  number of entries in @table
+ */
+void msm_gpios_disable(const struct msm_gpio *table, int size);
+
+/* GPIO TLMM (Top Level Multiplexing) Definitions */
+
+/* GPIO TLMM: Function -- GPIO specific */
+
+/* GPIO TLMM: Direction */
+enum {
+        GPIO_INPUT,
+        GPIO_OUTPUT,
+};
+
+/* GPIO TLMM: Pullup/Pulldown */
+enum {
+        GPIO_NO_PULL,
+        GPIO_PULL_DOWN,
+        GPIO_KEEPER,
+        GPIO_PULL_UP,
+};
+
+/* GPIO TLMM: Drive Strength */
+enum {
+        GPIO_2MA,
+        GPIO_4MA,
+        GPIO_6MA,
+        GPIO_8MA,
+        GPIO_10MA,
+        GPIO_12MA,
+        GPIO_14MA,
+        GPIO_16MA,
+};
+
+enum {
+        GPIO_ENABLE,
+        GPIO_DISABLE,
+};
+
+#define GPIO_CFG(gpio, func, dir, pull, drvstr) \
+        ((((gpio) & 0x3FF) << 4)        |         \
+         ((func) & 0xf)                  |        \
+         (((dir) & 0x1) << 14)           |        \
+         (((pull) & 0x3) << 15)          |        \
+         (((drvstr) & 0xF) << 17))
+
+/**
+ * extract GPIO pin from bit-field used for gpio_tlmm_config
+ */
+#define GPIO_PIN(gpio_cfg)    (((gpio_cfg) >>  4) & 0x3ff)
+#define GPIO_FUNC(gpio_cfg)   (((gpio_cfg) >>  0) & 0xf)
+#define GPIO_DIR(gpio_cfg)    (((gpio_cfg) >> 14) & 0x1)
+#define GPIO_PULL(gpio_cfg)   (((gpio_cfg) >> 15) & 0x3)
+#define GPIO_DRVSTR(gpio_cfg) (((gpio_cfg) >> 17) & 0xf)
+
+int gpio_tlmm_config(unsigned config, unsigned disable);
+
+#endif /* __ASM_ARCH_MSM_GPIO_H */