ARM: 6155/1: nomadik-gpio: add pin configuration API

Add a pin configuration API to all pin-related configuration to be
specified with a single macro and groups of pins to be configured
at one go.  Based on the PXA MFP implementation.

Cc: Alessandro Rubini <rubini@unipv.it>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 72 insertions, 0 deletions

diff --git a/arch/arm/plat-nomadik/include/plat/pincfg.h b/arch/arm/plat-nomadik/include/plat/pincfg.h
new file mode 100644
index 000000000000..7eed11c1038d
--- /dev/null
+++ b/arch/arm/plat-nomadik/include/plat/pincfg.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License terms: GNU General Public License, version 2
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ *
+ * Based on arch/arm/mach-pxa/include/mach/mfp.h:
+ *   Copyright (C) 2007 Marvell International Ltd.
+ *   eric miao <eric.miao@marvell.com>
+ */
+
+#ifndef __PLAT_PINCFG_H
+#define __PLAT_PINCFG_H
+
+/*
+ * pin configurations are represented by 32-bit integers:
+ *
+ *      bit  0.. 8 - Pin Number (512 Pins Maximum)
+ *      bit  9..10 - Alternate Function Selection
+ *      bit 11..12 - Pull up/down state
+ *      bit     13 - Sleep mode behaviour
+ *
+ * to facilitate the definition, the following macros are provided
+ *
+ * PIN_CFG_DEFAULT - default config (0):
+ *                   pull up/down = disabled
+ *                   sleep mode = input
+ *
+ * PIN_CFG         - default config with alternate function
+ * PIN_CFG_PULL    - default config with alternate function and pull up/down
+ */
+
+typedef unsigned long pin_cfg_t;
+
+#define PIN_NUM_MASK            0x1ff
+#define PIN_NUM(x)              ((x) & PIN_NUM_MASK)
+
+#define PIN_ALT_SHIFT           9
+#define PIN_ALT_MASK            (0x3 << PIN_ALT_SHIFT)
+#define PIN_ALT(x)              (((x) & PIN_ALT_MASK) >> PIN_ALT_SHIFT)
+#define PIN_GPIO                (NMK_GPIO_ALT_GPIO << PIN_ALT_SHIFT)
+#define PIN_ALT_A               (NMK_GPIO_ALT_A << PIN_ALT_SHIFT)
+#define PIN_ALT_B               (NMK_GPIO_ALT_B << PIN_ALT_SHIFT)
+#define PIN_ALT_C               (NMK_GPIO_ALT_C << PIN_ALT_SHIFT)
+
+#define PIN_PULL_SHIFT          11
+#define PIN_PULL_MASK           (0x3 << PIN_PULL_SHIFT)
+#define PIN_PULL(x)             (((x) & PIN_PULL_MASK) >> PIN_PULL_SHIFT)
+#define PIN_PULL_NONE           (NMK_GPIO_PULL_NONE << PIN_PULL_SHIFT)
+#define PIN_PULL_UP             (NMK_GPIO_PULL_UP << PIN_PULL_SHIFT)
+#define PIN_PULL_DOWN           (NMK_GPIO_PULL_DOWN << PIN_PULL_SHIFT)
+
+#define PIN_SLPM_SHIFT          13
+#define PIN_SLPM_MASK           (0x1 << PIN_SLPM_SHIFT)
+#define PIN_SLPM(x)             (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT)
+#define PIN_SLPM_INPUT          (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT)
+#define PIN_SLPM_NOCHANGE       (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT)
+
+#define PIN_CFG_DEFAULT         (PIN_PULL_NONE | PIN_SLPM_INPUT)
+
+#define PIN_CFG(num, alt)               \
+        (PIN_CFG_DEFAULT |\
+         (PIN_NUM(num) | PIN_##alt))
+
+#define PIN_CFG_PULL(num, alt, pull)    \
+        ((PIN_CFG_DEFAULT & ~PIN_PULL_MASK) |\
+         (PIN_NUM(num) | PIN_##alt | PIN_PULL_##pull))
+
+extern int nmk_config_pin(pin_cfg_t cfg);
+extern int nmk_config_pins(pin_cfg_t *cfgs, int num);
+
+#endif