ARM: tegra: add nvec driver

Adopted version of nvec driver from linux kernel with
keyboard support only.

Signed-off-by: Andrey Danin <danindrey@mail.ru>
[squashed, forward ported, and cleaned up]
Signed-off-by: Marc Dietrich <marvin24@gmx.de>

Author: marvintwentyfour

arch/arm/include/asm/arch-tegra/tegra_nvec.h

@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2013
+ * Andrey Danin <andreydanin@mail.ru>
+ *
+ * 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
+ */
+
+#ifndef _TEGRA_NVEC_H_
+#define _TEGRA_NVEC_H_
+
+#define I2C_CNFG			0x00
+#define I2C_CNFG_PACKET_MODE_EN		(1<<10)
+#define I2C_CNFG_NEW_MASTER_SFM		(1<<11)
+#define I2C_CNFG_DEBOUNCE_CNT_SHIFT	12
+
+#define I2C_SL_CNFG		0x20
+#define I2C_SL_NEWSL		(1<<2)
+#define I2C_SL_NACK		(1<<1)
+#define I2C_SL_RESP		(1<<0)
+#define I2C_SL_IRQ		(1<<3)
+#define END_TRANS		(1<<4)
+#define RCVD			(1<<2)
+#define RNW			(1<<1)
+
+#define I2C_SL_RCVD		0x24
+#define I2C_SL_STATUS		0x28
+#define I2C_SL_ADDR1		0x2c
+#define I2C_SL_ADDR2		0x30
+#define I2C_SL_DELAY_COUNT	0x3c
+
+
+enum nvec_msg_type {
+	NVEC_KEYBOARD = 0,
+	NVEC_SYS = 1,
+	NVEC_BAT,
+	NVEC_GPIO,
+	NVEC_SLEEP,
+	NVEC_KBD,
+	NVEC_PS2,
+	NVEC_CNTL,
+	NVEC_OEM0 = 0x0d,
+	NVEC_KB_EVT = 0x80,
+	NVEC_PS2_EVT,
+};
+
+enum nvec_event_size {
+	NVEC_2BYTES,
+	NVEC_3BYTES,
+	NVEC_VAR_SIZE,
+};
+
+enum sys_subcmds {
+	SYS_GET_STATUS,
+	SYS_CNFG_EVENT_REPORTING,
+	SYS_ACK_STATUS,
+	SYS_CNFG_WAKE = 0xfd,
+};
+
+enum kbd_subcmds {
+	CNFG_WAKE = 3,
+	CNFG_WAKE_KEY_REPORTING,
+	SET_LEDS = 0xed,
+	ENABLE_KBD = 0xf4,
+	DISABLE_KBD,
+};
+
+enum cntl_subcmds {
+	CNTL_RESET_EC = 0x00,
+	CNTL_SELF_TEST = 0x01,
+	CNTL_NOOP = 0x02,
+	CNTL_GET_EC_SPEC_VER = 0x10,
+	CNTL_GET_FIRMWARE_VERSION = 0x15,
+};
+
+enum nvec_sleep_subcmds {
+	GLOBAL_EVENTS,
+	AP_PWR_DOWN,
+	AP_SUSPEND,
+};
+
+#define MOUSE_SEND_CMD 0x01
+#define MOUSE_RESET 0xff
+
+
+int board_nvec_init(void);
+
+int nvec_msg_is_event(const unsigned char *msg);
+int nvec_msg_event_type(const unsigned char *msg);
+
+/**
+ * Send request and read response. If write or read failed
+ * operation will be repeated NVEC_ATTEMPTS_MAX times.
+ *
+ * @param buf		request data
+ * @param size		request data size
+ * @return 0 if ok, -1 on error
+ */
+int nvec_do_request(char *buf, int size);
+
+
+#endif /* _TEGRA_NVEC_H_ */

arch/arm/include/asm/arch-tegra/tegra_nvec_events.h

@@ -0,0 +1,31 @@
+/*
+ * (C) Copyright 2013
+ * Andrey Danin <andreydanin@mail.ru>
+ *
+ * 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
+ */
+
+#ifndef _TEGRA_NVEC_EVENTS_H_
+#define _TEGRA_NVEC_EVENTS_H_
+
+
+int nvec_read_events(void);
+
+
+#endif /* _TEGRA_NVEC_EVENTS_H_ */

drivers/i2c/Kconfig

@@ -696,6 +696,11 @@ config SYS_I2C_IHS
         help
           Support for gdsys IHS I2C driver on FPGA bus.
 
+config TEGRA_NVEC
+       bool "Enable Tegra 2 NVEC driver"
+       help
+         Support for Tegra 2 I2C NVEC keyboard.
+
 source "drivers/i2c/muxes/Kconfig"
 
 endif

drivers/i2c/Makefile

@@ -11,6 +11,7 @@ obj-$(CONFIG_$(SPL_)I2C_CROS_EC_TUNNEL) += cros_ec_tunnel.o
 obj-$(CONFIG_$(SPL_)I2C_CROS_EC_LDO) += cros_ec_ldo.o
 
 obj-$(CONFIG_$(SPL_)SYS_I2C_LEGACY) += i2c_core.o
+obj-$(CONFIG_TEGRA_NVEC) += tegra_nvec.o
 obj-$(CONFIG_SYS_I2C_ASPEED) += ast_i2c.o
 obj-$(CONFIG_SYS_I2C_AT91) += at91_i2c.o
 obj-$(CONFIG_SYS_I2C_CADENCE) += i2c-cdns.o