1 files changed, 157 insertions, 0 deletions

diff --git a/arch/arm/plat-stmp3xxx/include/mach/pinmux.h b/arch/arm/plat-stmp3xxx/include/mach/pinmux.h
new file mode 100644
index 000000000000..cc5af82279ad
--- /dev/null
+++ b/arch/arm/plat-stmp3xxx/include/mach/pinmux.h
@@ -0,0 +1,157 @@
+/*
+ * Freescale STMP37XX/STMP378X Pin Multiplexing
+ *
+ * Author: Vladislav Buzov <vbuzov@embeddedalley.com>
+ *
+ * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#ifndef __PINMUX_H
+#define __PINMUX_H
+
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/gpio.h>
+#include <asm-generic/gpio.h>
+
+/* Pin definitions */
+#include "pins.h"
+#include <mach/pins.h>
+
+/*
+ * Each pin may be routed up to four different HW interfaces
+ * including GPIO
+ */
+enum pin_fun {
+        PIN_FUN1 = 0,
+        PIN_FUN2,
+        PIN_FUN3,
+        PIN_GPIO,
+};
+
+/*
+ * Each pin may have different output drive strength in range from
+ * 4mA to 20mA. The most common case is 4, 8 and 12 mA strengths.
+ */
+enum pin_strength {
+        PIN_4MA = 0,
+        PIN_8MA,
+        PIN_12MA,
+        PIN_16MA,
+        PIN_20MA,
+};
+
+/*
+ * Each pin can be programmed for 1.8V or 3.3V
+ */
+enum pin_voltage {
+        PIN_1_8V = 0,
+        PIN_3_3V,
+};
+
+/*
+ * Structure to define a group of pins and their parameters
+ */
+struct pin_desc {
+        unsigned id;
+        enum pin_fun fun;
+        enum pin_strength strength;
+        enum pin_voltage voltage;
+        unsigned pullup:1;
+};
+
+struct pin_group {
+        struct pin_desc *pins;
+        int nr_pins;
+};
+
+/* Set pin drive strength */
+void stmp3xxx_pin_strength(unsigned id, enum pin_strength strength,
+                           const char *label);
+
+/* Set pin voltage */
+void stmp3xxx_pin_voltage(unsigned id, enum pin_voltage voltage,
+                           const char *label);
+
+/* Enable pull-up resistor for a pin */
+void stmp3xxx_pin_pullup(unsigned id, int enable, const char *label);
+
+/*
+ * Request a pin ownership, only one module (identified by @label)
+ * may own a pin.
+ */
+int stmp3xxx_request_pin(unsigned id, enum pin_fun fun, const char *label);
+
+/* Release pin */
+void stmp3xxx_release_pin(unsigned id, const char *label);
+
+void stmp3xxx_set_pin_type(unsigned id, enum pin_fun fun);
+
+/*
+ * Each bank is associated with a number of registers to control
+ * pin function, drive strength, voltage and pull-up reigster. The
+ * number of registers of a given type depends on the number of bits
+ * describin particular pin.
+ */
+#define HW_MUXSEL_NUM           2       /* registers per bank */
+#define HW_MUXSEL_PIN_LEN       2       /* bits per pin */
+#define HW_MUXSEL_PIN_NUM       16      /* pins per register */
+#define HW_MUXSEL_PINFUN_MASK   0x3     /* pin function mask */
+#define HW_MUXSEL_PINFUN_NUM    4       /* four options for a pin */
+
+#define HW_DRIVE_NUM            4       /* registers per bank */
+#define HW_DRIVE_PIN_LEN        4       /* bits per pin */
+#define HW_DRIVE_PIN_NUM        8       /* pins per register */
+#define HW_DRIVE_PINDRV_MASK    0x3     /* pin strength mask - 2 bits */
+#define HW_DRIVE_PINDRV_NUM     5       /* five possible strength values */
+#define HW_DRIVE_PINV_MASK      0x4     /* pin voltage mask - 1 bit */
+
+
+struct stmp3xxx_pinmux_bank {
+        struct gpio_chip chip;
+
+        /* Pins allocation map */
+        unsigned long pin_map;
+
+        /* Pin owner names */
+        const char *pin_labels[32];
+
+        /* Bank registers */
+        void __iomem *hw_muxsel[HW_MUXSEL_NUM];
+        void __iomem *hw_drive[HW_DRIVE_NUM];
+        void __iomem *hw_pull;
+
+        void __iomem *pin2irq,
+                *irqlevel,
+                *irqpolarity,
+                *irqen,
+                *irqstat;
+
+        /* HW MUXSEL register function bit values */
+        u8 functions[HW_MUXSEL_PINFUN_NUM];
+
+        /*
+         * HW DRIVE register strength bit values:
+         * 0xff - requested strength is not supported for this bank
+         */
+        u8 strengths[HW_DRIVE_PINDRV_NUM];
+
+        /* GPIO things */
+        void __iomem *hw_gpio_in,
+                     *hw_gpio_out,
+                     *hw_gpio_doe;
+        int irq, virq;
+};
+
+int __init stmp3xxx_pinmux_init(int virtual_irq_start);
+
+#endif /* __PINMUX_H */