ARM: k2g: Add support for pin mux configuration

Add api for configuring pin mux.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

arch/arm/mach-keystone/include/mach/mux-k2g.h

@@ -0,0 +1,58 @@
+/*
+ * K2G: Pinmux configuration
+ *
+ * (C) Copyright 2015
+ *     Texas Instruments Incorporated, <www.ti.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_MUX_K2G_H
+#define __ASM_ARCH_MUX_K2G_H
+
+#include <common.h>
+#include <asm/io.h>
+
+#define K2G_PADCFG_REG	(KS2_DEVICE_STATE_CTRL_BASE + 0x1000)
+
+/*
+ * 20:19 - buffer class RW fixed
+ * 18    - rxactive (Input enabled for the pad ) 0 - Di; 1 - En;
+ * 17    - pulltypesel (0 - PULLDOWN; 1 - PULLUP);
+ * 16    - pulluden (0 - PULLUP/DOWN EN; 1 - DI);
+ * 3:0   - muxmode (available modes 0:5)
+ */
+
+#define PIN_IEN	(1 << 18) /* pin input enabled */
+#define PIN_PDIS	(1 << 16) /* pull up/down disabled */
+#define PIN_PTU	(1 << 17) /* pull up */
+#define PIN_PTD	(0 << 17) /* pull down */
+
+#define MODE(m)	((m) & 0x7)
+#define MAX_PIN_N	260
+
+#define MUX_CFG(value, index)  \
+	__raw_writel(\
+		     (value) | \
+		     (__raw_readl(K2G_PADCFG_REG + (index << 2)) & \
+		      (0x3 << 19)),\
+		     (K2G_PADCFG_REG + (index << 2))\
+		    );
+
+struct pin_cfg {
+	int	reg_inx;
+	u32	val;
+};
+
+static inline void configure_pin_mux(struct pin_cfg *pin_mux)
+{
+	if (!pin_mux)
+		return;
+
+	while ((pin_mux->reg_inx >= 0) && (pin_mux->reg_inx < MAX_PIN_N)) {
+		MUX_CFG(pin_mux->val, pin_mux->reg_inx);
+		pin_mux++;
+	}
+}
+
+#endif /* __ASM_ARCH_MUX_K2G_H */