lantiq: Add support for linux 4.4

The following patches were dropped because they are already applied
upstream:
- 0038-MIPS-lantiq-fpi-on-ar9.patch
- 0039-MIPS-lantiq-initialize-usb-on-boot.patch
- 0042-USB-DWC2-big-endian-support.patch
- 0043-gpio-stp-xway-fix-phy-mask.patch

All other patches were simply refreshed, except the following:
- 0001-MIPS-lantiq-add-pcie-driver.patch
  Changes to arch/mips/lantiq/xway/sysctrl.c (these changes disabled
  some PMU gates for the vrx200 / VR9 SoCs) were removed since the
  upstream kernel disables unused PMU gates automatically (since
  95135bfa7ead1becc2879230f72583dde2b71a0c
  "MIPS: Lantiq: Deactivate most of the devices by default").
- 0025-NET-MIPS-lantiq-adds-xrx200-net.patch
  Since OpenWrt commit 55ba20afcc2fe785146316e5be2c2473cb329885 drivers
  should use of_get_mac_address(). of_get_mac_address_mtd is not
  available for drivers anymore since it's called automatically within
  of_get_mac_address().
- 0028-NET-lantiq-various-etop-fixes.patch
  Same changes as in 0025-NET-MIPS-lantiq-adds-xrx200-net.patch

While refreshing the kernel configuration SPI support had to be moved to
config-4.4 because otherwise M25P80 was disabled.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

SVN-Revision: 48307

1 files changed, 1034 insertions, 0 deletions

diff --git a/target/linux/lantiq/patches-4.4/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch b/target/linux/lantiq/patches-4.4/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch
new file mode 100644
index 0000000000..a9ae084a60
--- /dev/null
+++ b/target/linux/lantiq/patches-4.4/0031-I2C-MIPS-lantiq-add-FALC-ON-i2c-bus-master.patch
@@ -0,0 +1,1034 @@
+From f17e50f67fa3c77624edf2ca03fae0d50f0ce39b Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Thu, 7 Aug 2014 18:26:42 +0200
+Subject: [PATCH 31/36] I2C: MIPS: lantiq: add FALC-ON i2c bus master
+
+This patch adds the driver needed to make the I2C bus work on FALC-ON SoCs.
+
+Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/i2c/busses/Kconfig      |   10 +
+ drivers/i2c/busses/Makefile     |    1 +
+ drivers/i2c/busses/i2c-lantiq.c |  747 +++++++++++++++++++++++++++++++++++++++
+ drivers/i2c/busses/i2c-lantiq.h |  234 ++++++++++++
+ 4 files changed, 992 insertions(+)
+ create mode 100644 drivers/i2c/busses/i2c-lantiq.c
+ create mode 100644 drivers/i2c/busses/i2c-lantiq.h
+
+--- a/drivers/i2c/busses/Kconfig
++++ b/drivers/i2c/busses/Kconfig
+@@ -639,6 +639,16 @@ config I2C_MESON
+ 	  If you say yes to this option, support will be included for the
+ 	  I2C interface on the Amlogic Meson family of SoCs.
+ 
++config I2C_LANTIQ
++	tristate "Lantiq I2C interface"
++	depends on LANTIQ && SOC_FALCON
++	help
++	  If you say yes to this option, support will be included for the
++	  Lantiq I2C core.
++
++	  This driver can also be built as a module. If so, the module
++	  will be called i2c-lantiq.
++
+ config I2C_MPC
+ 	tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
+ 	depends on PPC
+--- a/drivers/i2c/busses/Makefile
++++ b/drivers/i2c/busses/Makefile
+@@ -59,6 +59,7 @@ obj-$(CONFIG_I2C_IMX)		+= i2c-imx.o
+ obj-$(CONFIG_I2C_IOP3XX)	+= i2c-iop3xx.o
+ obj-$(CONFIG_I2C_JZ4780)	+= i2c-jz4780.o
+ obj-$(CONFIG_I2C_KEMPLD)	+= i2c-kempld.o
++obj-$(CONFIG_I2C_LANTIQ)	+= i2c-lantiq.o
+ obj-$(CONFIG_I2C_LPC2K)		+= i2c-lpc2k.o
+ obj-$(CONFIG_I2C_MESON)		+= i2c-meson.o
+ obj-$(CONFIG_I2C_MPC)		+= i2c-mpc.o
+--- /dev/null
++++ b/drivers/i2c/busses/i2c-lantiq.c
+@@ -0,0 +1,747 @@
++
++/*
++ * Lantiq I2C bus adapter
++ *
++ * Parts based on i2c-designware.c and other i2c drivers from Linux 2.6.33
++ *
++ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
++ *
++ * Copyright (C) 2012 Thomas Langer <thomas.langer@lantiq.com>
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/delay.h>
++#include <linux/slab.h> /* for kzalloc, kfree */
++#include <linux/i2c.h>
++#include <linux/errno.h>
++#include <linux/completion.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/of_irq.h>
++#include <linux/of_i2c.h>
++
++#include <lantiq_soc.h>
++#include "i2c-lantiq.h"
++
++/*
++ * CURRENT ISSUES:
++ * - no high speed support
++ * - ten bit mode is not tested (no slave devices)
++ */
++
++/* access macros */
++#define i2c_r32(reg)	\
++	__raw_readl(&(priv->membase)->reg)
++#define i2c_w32(val, reg)	\
++	__raw_writel(val, &(priv->membase)->reg)
++#define i2c_w32_mask(clear, set, reg)	\
++	i2c_w32((i2c_r32(reg) & ~(clear)) | (set), reg)
++
++#define DRV_NAME "i2c-lantiq"
++#define DRV_VERSION "1.00"
++
++#define LTQ_I2C_BUSY_TIMEOUT		20 /* ms */
++
++#ifdef DEBUG
++#define LTQ_I2C_XFER_TIMEOUT		(25*HZ)
++#else
++#define LTQ_I2C_XFER_TIMEOUT		HZ
++#endif
++
++#define LTQ_I2C_IMSC_DEFAULT_MASK	(I2C_IMSC_I2C_P_INT_EN | \
++					 I2C_IMSC_I2C_ERR_INT_EN)
++
++#define LTQ_I2C_ARB_LOST		(1 << 0)
++#define LTQ_I2C_NACK			(1 << 1)
++#define LTQ_I2C_RX_UFL			(1 << 2)
++#define LTQ_I2C_RX_OFL			(1 << 3)
++#define LTQ_I2C_TX_UFL			(1 << 4)
++#define LTQ_I2C_TX_OFL			(1 << 5)
++
++struct ltq_i2c {
++	struct mutex mutex;
++
++
++	/* active clock settings */
++	unsigned int input_clock;	/* clock input for i2c hardware block */
++	unsigned int i2c_clock;		/* approximated bus clock in kHz */
++
++	struct clk *clk_gate;
++	struct clk *clk_input;
++
++
++	/* resources (memory and interrupts) */
++	int irq_lb;				/* last burst irq */
++
++	struct lantiq_reg_i2c __iomem *membase;	/* base of mapped registers */
++
++	struct i2c_adapter adap;
++	struct device *dev;
++
++	struct completion cmd_complete;
++
++
++	/* message transfer data */
++	struct i2c_msg *current_msg;	/* current message */
++	int msgs_num;		/* number of messages to handle */
++	u8 *msg_buf;		/* current buffer */
++	u32 msg_buf_len;	/* remaining length of current buffer */
++	int msg_err;		/* error status of the current transfer */
++
++
++	/* master status codes */
++	enum {
++		STATUS_IDLE,
++		STATUS_ADDR,	/* address phase */
++		STATUS_WRITE,
++		STATUS_READ,
++		STATUS_READ_END,
++		STATUS_STOP
++	} status;
++};
++
++static irqreturn_t ltq_i2c_isr(int irq, void *dev_id);
++
++static inline void enable_burst_irq(struct ltq_i2c *priv)
++{
++	i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
++}
++static inline void disable_burst_irq(struct ltq_i2c *priv)
++{
++	i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
++}
++
++static void prepare_msg_send_addr(struct ltq_i2c *priv)
++{
++	struct i2c_msg *msg = priv->current_msg;
++	int rd = !!(msg->flags & I2C_M_RD);	/* extends to 0 or 1 */
++	u16 addr = msg->addr;
++
++	/* new i2c_msg */
++	priv->msg_buf = msg->buf;
++	priv->msg_buf_len = msg->len;
++	if (rd)
++		priv->status = STATUS_READ;
++	else
++		priv->status = STATUS_WRITE;
++
++	/* send slave address */
++	if (msg->flags & I2C_M_TEN) {
++		i2c_w32(0xf0 | ((addr & 0x300) >> 7) | rd, txd);
++		i2c_w32(addr & 0xff, txd);
++	} else {
++		i2c_w32((addr & 0x7f) << 1 | rd, txd);
++	}
++}
++
++static void ltq_i2c_set_tx_len(struct ltq_i2c *priv)
++{
++	struct i2c_msg *msg = priv->current_msg;
++	int len = (msg->flags & I2C_M_TEN) ? 2 : 1;
++
++	pr_debug("set_tx_len %cX\n", (msg->flags & I2C_M_RD) ? 'R' : 'T');
++
++	priv->status = STATUS_ADDR;
++
++	if (!(msg->flags & I2C_M_RD))
++		len += msg->len;
++	else
++		/* set maximum received packet size (before rx int!) */
++		i2c_w32(msg->len, mrps_ctrl);
++	i2c_w32(len, tps_ctrl);
++	enable_burst_irq(priv);
++}
++
++static int ltq_i2c_hw_set_clock(struct i2c_adapter *adap)
++{
++	struct ltq_i2c *priv = i2c_get_adapdata(adap);
++	unsigned int input_clock = clk_get_rate(priv->clk_input);
++	u32 dec, inc = 1;
++
++	/* clock changed? */
++	if (priv->input_clock == input_clock)
++		return 0;
++
++	/*
++	 * this formula is only an approximation, found by the recommended
++	 * values in the "I2C Architecture Specification 1.7.1"
++	 */
++	dec = input_clock / (priv->i2c_clock * 2);
++	if (dec <= 6)
++		return -ENXIO;
++
++	i2c_w32(0, fdiv_high_cfg);
++	i2c_w32((inc << I2C_FDIV_CFG_INC_OFFSET) |
++		(dec << I2C_FDIV_CFG_DEC_OFFSET),
++		fdiv_cfg);
++
++	dev_info(priv->dev, "setup clocks (in %d kHz, bus %d kHz, dec=%d)\n",
++		input_clock, priv->i2c_clock, dec);
++
++	priv->input_clock = input_clock;
++	return 0;
++}
++
++static int ltq_i2c_hw_init(struct i2c_adapter *adap)
++{
++	int ret = 0;
++	struct ltq_i2c *priv = i2c_get_adapdata(adap);
++
++	/* disable bus */
++	i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
++
++#ifndef DEBUG
++	/* set normal operation clock divider */
++	i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc);
++#else
++	/* for debugging a higher divider value! */
++	i2c_w32(0xF0 << I2C_CLC_RMC_OFFSET, clc);
++#endif
++
++	/* setup clock */
++	ret = ltq_i2c_hw_set_clock(adap);
++	if (ret != 0) {
++		dev_warn(priv->dev, "invalid clock settings\n");
++		return ret;
++	}
++
++	/* configure fifo */
++	i2c_w32(I2C_FIFO_CFG_TXFC | /* tx fifo as flow controller */
++		I2C_FIFO_CFG_RXFC | /* rx fifo as flow controller */
++		I2C_FIFO_CFG_TXFA_TXFA2 | /* tx fifo 4-byte aligned */
++		I2C_FIFO_CFG_RXFA_RXFA2 | /* rx fifo 4-byte aligned */
++		I2C_FIFO_CFG_TXBS_TXBS0 | /* tx fifo burst size is 1 word */
++		I2C_FIFO_CFG_RXBS_RXBS0,  /* rx fifo burst size is 1 word */
++		fifo_cfg);
++
++	/* configure address */
++	i2c_w32(I2C_ADDR_CFG_SOPE_EN |	/* generate stop when no more data in
++					   the fifo */
++		I2C_ADDR_CFG_SONA_EN |	/* generate stop when NA received */
++		I2C_ADDR_CFG_MnS_EN |	/* we are master device */
++		0,			/* our slave address (not used!) */
++		addr_cfg);
++
++	/* enable bus */
++	i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
++
++	return 0;
++}
++
++static int ltq_i2c_wait_bus_not_busy(struct ltq_i2c *priv)
++{
++	unsigned long timeout;
++
++	timeout = jiffies + msecs_to_jiffies(LTQ_I2C_BUSY_TIMEOUT);
++
++	do {
++		u32 stat = i2c_r32(bus_stat);
++
++		if ((stat & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_FREE)
++			return 0;
++
++		cond_resched();
++	} while (!time_after_eq(jiffies, timeout));
++
++	dev_err(priv->dev, "timeout waiting for bus ready\n");
++	return -ETIMEDOUT;
++}
++
++static void ltq_i2c_tx(struct ltq_i2c *priv, int last)
++{
++	if (priv->msg_buf_len && priv->msg_buf) {
++		i2c_w32(*priv->msg_buf, txd);
++
++		if (--priv->msg_buf_len)
++			priv->msg_buf++;
++		else
++			priv->msg_buf = NULL;
++	} else {
++		last = 1;
++	}
++
++	if (last)
++		disable_burst_irq(priv);
++}
++
++static void ltq_i2c_rx(struct ltq_i2c *priv, int last)
++{
++	u32 fifo_stat, timeout;
++	if (priv->msg_buf_len && priv->msg_buf) {
++		timeout = 5000000;
++		do {
++			fifo_stat = i2c_r32(ffs_stat);
++		} while (!fifo_stat && --timeout);
++		if (!timeout) {
++			last = 1;
++			pr_debug("\nrx timeout\n");
++			goto err;
++		}
++		while (fifo_stat) {
++			*priv->msg_buf = i2c_r32(rxd);
++			if (--priv->msg_buf_len) {
++				priv->msg_buf++;
++			} else {
++				priv->msg_buf = NULL;
++				last = 1;
++				break;
++			}
++			/*
++			 * do not read more than burst size, otherwise no "last
++			 * burst" is generated and the transaction is blocked!
++			 */
++			fifo_stat = 0;
++		}
++	} else {
++		last = 1;
++	}
++err:
++	if (last) {
++		disable_burst_irq(priv);
++
++		if (priv->status == STATUS_READ_END) {
++			/* 
++			 * do the STATUS_STOP and complete() here, as sometimes
++			 * the tx_end is already seen before this is finished
++			 */
++			priv->status = STATUS_STOP;
++			complete(&priv->cmd_complete);
++		} else {
++			i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl);
++			priv->status = STATUS_READ_END;
++		}
++	}
++}
++
++static void ltq_i2c_xfer_init(struct ltq_i2c *priv)
++{
++	/* enable interrupts */
++	i2c_w32(LTQ_I2C_IMSC_DEFAULT_MASK, imsc);
++
++	/* trigger transfer of first msg */
++	ltq_i2c_set_tx_len(priv);
++}
++
++static void dump_msgs(struct i2c_msg msgs[], int num, int rx)
++{
++#if defined(DEBUG)
++	int i, j;
++	pr_debug("Messages %d %s\n", num, rx ? "out" : "in");
++	for (i = 0; i < num; i++) {
++		pr_debug("%2d %cX Msg(%d) addr=0x%X: ", i,
++			(msgs[i].flags & I2C_M_RD) ? 'R' : 'T',
++			msgs[i].len, msgs[i].addr);
++		if (!(msgs[i].flags & I2C_M_RD) || rx) {
++			for (j = 0; j < msgs[i].len; j++)
++				pr_debug("%02X ", msgs[i].buf[j]);
++		}
++		pr_debug("\n");
++	}
++#endif
++}
++
++static void ltq_i2c_release_bus(struct ltq_i2c *priv)
++{
++	if ((i2c_r32(bus_stat) & I2C_BUS_STAT_BS_MASK) == I2C_BUS_STAT_BS_BM)
++		i2c_w32(I2C_ENDD_CTRL_SETEND, endd_ctrl);
++}
++
++static int ltq_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
++			   int num)
++{
++	struct ltq_i2c *priv = i2c_get_adapdata(adap);
++	int ret;
++
++	dev_dbg(priv->dev, "xfer %u messages\n", num);
++	dump_msgs(msgs, num, 0);
++
++	mutex_lock(&priv->mutex);
++
++	init_completion(&priv->cmd_complete);
++	priv->current_msg = msgs;
++	priv->msgs_num = num;
++	priv->msg_err = 0;
++	priv->status = STATUS_IDLE;
++
++	/* wait for the bus to become ready */
++	ret = ltq_i2c_wait_bus_not_busy(priv);
++	if (ret)
++		goto done;
++
++	while (priv->msgs_num) {
++		/* start the transfers */
++		ltq_i2c_xfer_init(priv);
++
++		/* wait for transfers to complete */
++		ret = wait_for_completion_interruptible_timeout(
++			&priv->cmd_complete, LTQ_I2C_XFER_TIMEOUT);
++		if (ret == 0) {
++			dev_err(priv->dev, "controller timed out\n");
++			ltq_i2c_hw_init(adap);
++			ret = -ETIMEDOUT;
++			goto done;
++		} else if (ret < 0)
++			goto done;
++
++		if (priv->msg_err) {
++			if (priv->msg_err & LTQ_I2C_NACK)
++				ret = -ENXIO;
++			else
++				ret = -EREMOTEIO;
++			goto done;
++		}
++		if (--priv->msgs_num)
++			priv->current_msg++;
++	}
++	/* no error? */
++	ret = num;
++
++done:
++	ltq_i2c_release_bus(priv);
++
++	mutex_unlock(&priv->mutex);
++
++	if (ret >= 0)
++		dump_msgs(msgs, num, 1);
++
++	pr_debug("XFER ret %d\n", ret);
++	return ret;
++}
++
++static irqreturn_t ltq_i2c_isr_burst(int irq, void *dev_id)
++{
++	struct ltq_i2c *priv = dev_id;
++	struct i2c_msg *msg = priv->current_msg;
++	int last = (irq == priv->irq_lb);
++
++	if (last)
++		pr_debug("LB ");
++	else
++		pr_debug("B ");
++
++	if (msg->flags & I2C_M_RD) {
++		switch (priv->status) {
++		case STATUS_ADDR:
++			pr_debug("X");
++			prepare_msg_send_addr(priv);
++			disable_burst_irq(priv);
++			break;
++		case STATUS_READ:
++		case STATUS_READ_END:
++			pr_debug("R");
++			ltq_i2c_rx(priv, last);
++			break;
++		default:
++			disable_burst_irq(priv);
++			pr_warn("Status R %d\n", priv->status);
++			break;
++		}
++	} else {
++		switch (priv->status) {
++		case STATUS_ADDR:
++			pr_debug("x");
++			prepare_msg_send_addr(priv);
++			break;
++		case STATUS_WRITE:
++			pr_debug("w");
++			ltq_i2c_tx(priv, last);
++			break;
++		default:
++			disable_burst_irq(priv);
++			pr_warn("Status W %d\n", priv->status);
++			break;
++		}
++	}
++
++	i2c_w32(I2C_ICR_BREQ_INT_CLR | I2C_ICR_LBREQ_INT_CLR, icr);
++	return IRQ_HANDLED;
++}
++
++static void ltq_i2c_isr_prot(struct ltq_i2c *priv)
++{
++	u32 i_pro = i2c_r32(p_irqss);
++
++	pr_debug("i2c-p");
++
++	/* not acknowledge */
++	if (i_pro & I2C_P_IRQSS_NACK) {
++		priv->msg_err |= LTQ_I2C_NACK;
++		pr_debug(" nack");
++	}
++
++	/* arbitration lost */
++	if (i_pro & I2C_P_IRQSS_AL) {
++		priv->msg_err |= LTQ_I2C_ARB_LOST;
++		pr_debug(" arb-lost");
++	}
++	/* tx -> rx switch */
++	if (i_pro & I2C_P_IRQSS_RX)
++		pr_debug(" rx");
++
++	/* tx end */
++	if (i_pro & I2C_P_IRQSS_TX_END)
++		pr_debug(" txend");
++	pr_debug("\n");
++
++	if (!priv->msg_err) {
++		/* tx -> rx switch */
++		if (i_pro & I2C_P_IRQSS_RX) {
++			priv->status = STATUS_READ;
++			enable_burst_irq(priv);
++		}
++		if (i_pro & I2C_P_IRQSS_TX_END) {
++			if (priv->status == STATUS_READ)
++				priv->status = STATUS_READ_END;
++			else {
++				disable_burst_irq(priv);
++				priv->status = STATUS_STOP;
++			}
++		}
++	}
++
++	i2c_w32(i_pro, p_irqsc);
++}
++
++static irqreturn_t ltq_i2c_isr(int irq, void *dev_id)
++{
++	u32 i_raw, i_err = 0;
++	struct ltq_i2c *priv = dev_id;
++
++	i_raw = i2c_r32(mis);
++	pr_debug("i_raw 0x%08X\n", i_raw);
++
++	/* error interrupt */
++	if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) {
++		i_err = i2c_r32(err_irqss);
++		pr_debug("i_err 0x%08X bus_stat 0x%04X\n",
++			i_err, i2c_r32(bus_stat));
++
++		/* tx fifo overflow (8) */
++		if (i_err & I2C_ERR_IRQSS_TXF_OFL)
++			priv->msg_err |= LTQ_I2C_TX_OFL;
++
++		/* tx fifo underflow (4) */
++		if (i_err & I2C_ERR_IRQSS_TXF_UFL)
++			priv->msg_err |= LTQ_I2C_TX_UFL;
++
++		/* rx fifo overflow (2) */
++		if (i_err & I2C_ERR_IRQSS_RXF_OFL)
++			priv->msg_err |= LTQ_I2C_RX_OFL;
++
++		/* rx fifo underflow (1) */
++		if (i_err & I2C_ERR_IRQSS_RXF_UFL)
++			priv->msg_err |= LTQ_I2C_RX_UFL;
++
++		i2c_w32(i_err, err_irqsc);
++	}
++
++	/* protocol interrupt */
++	if (i_raw & I2C_RIS_I2C_P_INT_INTOCC)
++		ltq_i2c_isr_prot(priv);
++
++	if ((priv->msg_err) || (priv->status == STATUS_STOP))
++		complete(&priv->cmd_complete);
++
++	return IRQ_HANDLED;
++}
++
++static u32 ltq_i2c_functionality(struct i2c_adapter *adap)
++{
++	return	I2C_FUNC_I2C |
++		I2C_FUNC_10BIT_ADDR |
++		I2C_FUNC_SMBUS_EMUL;
++}
++
++static struct i2c_algorithm ltq_i2c_algorithm = {
++	.master_xfer	= ltq_i2c_xfer,
++	.functionality	= ltq_i2c_functionality,
++};
++
++static int __devinit ltq_i2c_probe(struct platform_device *pdev)
++{
++	struct device_node *node = pdev->dev.of_node;
++	struct ltq_i2c *priv;
++	struct i2c_adapter *adap;
++	struct resource *mmres, irqres[4];
++	int ret = 0;
++
++	dev_dbg(&pdev->dev, "probing\n");
++
++	mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	ret = of_irq_to_resource_table(node, irqres, 4);
++	if (!mmres || (ret != 4)) {
++		dev_err(&pdev->dev, "no resources\n");
++		return -ENODEV;
++	}
++
++	/* allocate private data */
++	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
++	if (!priv) {
++		dev_err(&pdev->dev, "can't allocate private data\n");
++		return -ENOMEM;
++	}
++
++	adap = &priv->adap;
++	i2c_set_adapdata(adap, priv);
++	adap->owner = THIS_MODULE;
++	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
++	strlcpy(adap->name, DRV_NAME "-adapter", sizeof(adap->name));
++	adap->algo = &ltq_i2c_algorithm;
++
++	if (of_property_read_u32(node, "clock-frequency", &priv->i2c_clock)) {
++		dev_warn(&pdev->dev, "No I2C speed selected, using 100kHz\n");
++		priv->i2c_clock = 100000;
++	}
++
++	init_completion(&priv->cmd_complete);
++	mutex_init(&priv->mutex);
++
++	priv->membase = devm_request_and_ioremap(&pdev->dev, mmres);
++	if (priv->membase == NULL)
++		return -ENOMEM;
++
++	priv->dev = &pdev->dev;
++	priv->irq_lb = irqres[0].start;
++
++	ret = devm_request_irq(&pdev->dev, irqres[0].start, ltq_i2c_isr_burst,
++		0x0, "i2c lb", priv);
++	if (ret) {
++		dev_err(&pdev->dev, "can't get last burst IRQ %d\n",
++			irqres[0].start);
++		return -ENODEV;
++	}
++
++	ret = devm_request_irq(&pdev->dev, irqres[1].start, ltq_i2c_isr_burst,
++		0x0, "i2c b", priv);
++	if (ret) {
++		dev_err(&pdev->dev, "can't get burst IRQ %d\n",
++			irqres[1].start);
++		return -ENODEV;
++	}
++
++	ret = devm_request_irq(&pdev->dev, irqres[2].start, ltq_i2c_isr,
++		0x0, "i2c err", priv);
++	if (ret) {
++		dev_err(&pdev->dev, "can't get error IRQ %d\n",
++			irqres[2].start);
++		return -ENODEV;
++	}
++
++	ret = devm_request_irq(&pdev->dev, irqres[3].start, ltq_i2c_isr,
++		0x0, "i2c p", priv);
++	if (ret) {
++		dev_err(&pdev->dev, "can't get protocol IRQ %d\n",
++			irqres[3].start);
++		return -ENODEV;
++	}
++
++	dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase);
++	dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres[0].start,
++		irqres[1].start, irqres[2].start, irqres[3].start);
++
++	priv->clk_gate = devm_clk_get(&pdev->dev, NULL);
++	if (IS_ERR(priv->clk_gate)) {
++		dev_err(&pdev->dev, "failed to get i2c clk\n");
++		return -ENOENT;
++	}
++
++	/* this is a static clock, which has no refcounting */
++	priv->clk_input = clk_get_fpi();
++	if (IS_ERR(priv->clk_input)) {
++		dev_err(&pdev->dev, "failed to get fpi clk\n");
++		return -ENOENT;
++	}
++
++	clk_activate(priv->clk_gate);
++
++	/* add our adapter to the i2c stack */
++	ret = i2c_add_numbered_adapter(adap);
++	if (ret) {
++		dev_err(&pdev->dev, "can't register I2C adapter\n");
++		goto out;
++	}
++
++	platform_set_drvdata(pdev, priv);
++	i2c_set_adapdata(adap, priv);
++
++	/* print module version information */
++	dev_dbg(&pdev->dev, "module id=%u revision=%u\n",
++		(i2c_r32(id) & I2C_ID_ID_MASK) >> I2C_ID_ID_OFFSET,
++		(i2c_r32(id) & I2C_ID_REV_MASK) >> I2C_ID_REV_OFFSET);
++
++	/* initialize HW */
++	ret = ltq_i2c_hw_init(adap);
++	if (ret) {
++		dev_err(&pdev->dev, "can't configure adapter\n");
++		i2c_del_adapter(adap);
++		platform_set_drvdata(pdev, NULL);
++	} else {
++		dev_info(&pdev->dev, "version %s\n", DRV_VERSION);
++	}
++
++	of_i2c_register_devices(adap);
++
++out:
++	/* if init failed, we need to deactivate the clock gate */
++	if (ret)
++		clk_deactivate(priv->clk_gate);
++
++	return ret;
++}
++
++static int __devexit ltq_i2c_remove(struct platform_device *pdev)
++{
++	struct ltq_i2c *priv = platform_get_drvdata(pdev);
++
++	/* disable bus */
++	i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
++
++	/* power down the core */
++	clk_deactivate(priv->clk_gate);
++
++	/* remove driver */
++	i2c_del_adapter(&priv->adap);
++	kfree(priv);
++
++	dev_dbg(&pdev->dev, "removed\n");
++	platform_set_drvdata(pdev, NULL);
++
++	return 0;
++}
++static const struct of_device_id ltq_i2c_match[] = {
++	{ .compatible = "lantiq,lantiq-i2c" },
++	{},
++};
++MODULE_DEVICE_TABLE(of, ltq_i2c_match);
++
++static struct platform_driver ltq_i2c_driver = {
++	.probe	= ltq_i2c_probe,
++	.remove	= __devexit_p(ltq_i2c_remove),
++	.driver	= {
++		.name	= DRV_NAME,
++		.owner	= THIS_MODULE,
++		.of_match_table = ltq_i2c_match,
++	},
++};
++
++module_platform_driver(ltq_i2c_driver);
++
++MODULE_DESCRIPTION("Lantiq I2C bus adapter");
++MODULE_AUTHOR("Thomas Langer <thomas.langer@lantiq.com>");
++MODULE_ALIAS("platform:" DRV_NAME);
++MODULE_LICENSE("GPL");
++MODULE_VERSION(DRV_VERSION);
+--- /dev/null
++++ b/drivers/i2c/busses/i2c-lantiq.h
+@@ -0,0 +1,234 @@
++#ifndef I2C_LANTIQ_H
++#define I2C_LANTIQ_H
++
++/* I2C register structure */
++struct lantiq_reg_i2c {
++	/* I2C Kernel Clock Control Register */
++	unsigned int clc; /* 0x00000000 */
++	/* Reserved */
++	unsigned int res_0; /* 0x00000004 */
++	/* I2C Identification Register */
++	unsigned int id; /* 0x00000008 */
++	/* Reserved */
++	unsigned int res_1; /* 0x0000000C */
++	/*
++	 * I2C RUN Control Register
++	 * This register enables and disables the I2C peripheral. Before
++	 * enabling, the I2C has to be configured properly. After enabling
++	 * no configuration is possible
++	 */
++	unsigned int run_ctrl; /* 0x00000010 */
++	/*
++	 * I2C End Data Control Register
++	 * This register is used to either turn around the data transmission
++	 * direction or to address another slave without sending a stop
++	 * condition. Also the software can stop the slave-transmitter by
++	 * sending a not-accolade when working as master-receiver or even
++	 * stop data transmission immediately when operating as
++	 * master-transmitter. The writing to the bits of this control
++	 * register is only effective when in MASTER RECEIVES BYTES, MASTER
++	 * TRANSMITS BYTES, MASTER RESTART or SLAVE RECEIVE BYTES state
++	 */
++	unsigned int endd_ctrl; /* 0x00000014 */
++	/*
++	 * I2C Fractional Divider Configuration Register
++	 * These register is used to program the fractional divider of the I2C
++	 * bus. Before the peripheral is switched on by setting the RUN-bit the
++	 * two (fixed) values for the two operating frequencies are programmed
++	 * into these (configuration) registers. The Register FDIV_HIGH_CFG has
++	 * the same layout as I2C_FDIV_CFG.
++	 */
++	unsigned int fdiv_cfg; /* 0x00000018 */
++	/*
++	 * I2C Fractional Divider (highspeed mode) Configuration Register
++	 * These register is used to program the fractional divider of the I2C
++	 * bus. Before the peripheral is switched on by setting the RUN-bit the
++	 * two (fixed) values for the two operating frequencies are programmed
++	 * into these (configuration) registers. The Register FDIV_CFG has the
++	 * same layout as I2C_FDIV_CFG.
++	 */
++	unsigned int fdiv_high_cfg; /* 0x0000001C */
++	/* I2C Address Configuration Register */
++	unsigned int addr_cfg; /* 0x00000020 */
++	/* I2C Bus Status Register
++	 * This register gives a status information of the I2C. This additional
++	 * information can be used by the software to start proper actions.
++	 */
++	unsigned int bus_stat; /* 0x00000024 */
++	/* I2C FIFO Configuration Register */
++	unsigned int fifo_cfg; /* 0x00000028 */
++	/* I2C Maximum Received Packet Size Register */
++	unsigned int mrps_ctrl; /* 0x0000002C */
++	/* I2C Received Packet Size Status Register */
++	unsigned int rps_stat; /* 0x00000030 */
++	/* I2C Transmit Packet Size Register */
++	unsigned int tps_ctrl; /* 0x00000034 */
++	/* I2C Filled FIFO Stages Status Register */
++	unsigned int ffs_stat; /* 0x00000038 */
++	/* Reserved */
++	unsigned int res_2; /* 0x0000003C */
++	/* I2C Timing Configuration Register */
++	unsigned int tim_cfg; /* 0x00000040 */
++	/* Reserved */
++	unsigned int res_3[7]; /* 0x00000044 */
++	/* I2C Error Interrupt Request Source Mask Register */
++	unsigned int err_irqsm; /* 0x00000060 */
++	/* I2C Error Interrupt Request Source Status Register */
++	unsigned int err_irqss; /* 0x00000064 */
++	/* I2C Error Interrupt Request Source Clear Register */
++	unsigned int err_irqsc; /* 0x00000068 */
++	/* Reserved */
++	unsigned int res_4; /* 0x0000006C */
++	/* I2C Protocol Interrupt Request Source Mask Register */
++	unsigned int p_irqsm; /* 0x00000070 */
++	/* I2C Protocol Interrupt Request Source Status Register */
++	unsigned int p_irqss; /* 0x00000074 */
++	/* I2C Protocol Interrupt Request Source Clear Register */
++	unsigned int p_irqsc; /* 0x00000078 */
++	/* Reserved */
++	unsigned int res_5; /* 0x0000007C */
++	/* I2C Raw Interrupt Status Register */
++	unsigned int ris; /* 0x00000080 */
++	/* I2C Interrupt Mask Control Register */
++	unsigned int imsc; /* 0x00000084 */
++	/* I2C Masked Interrupt Status Register */
++	unsigned int mis; /* 0x00000088 */
++	/* I2C Interrupt Clear Register */
++	unsigned int icr; /* 0x0000008C */
++	/* I2C Interrupt Set Register */
++	unsigned int isr; /* 0x00000090 */
++	/* I2C DMA Enable Register */
++	unsigned int dmae; /* 0x00000094 */
++	/* Reserved */
++	unsigned int res_6[8154]; /* 0x00000098 */
++	/* I2C Transmit Data Register */
++	unsigned int txd; /* 0x00008000 */
++	/* Reserved */
++	unsigned int res_7[4095]; /* 0x00008004 */
++	/* I2C Receive Data Register */
++	unsigned int rxd; /* 0x0000C000 */
++	/* Reserved */
++	unsigned int res_8[4095]; /* 0x0000C004 */
++};
++
++/*
++ * Clock Divider for Normal Run Mode
++ * Max 8-bit divider value. IF RMC is 0 the module is disabled. Note: As long
++ * as the new divider value RMC is not valid, the register returns 0x0000 00xx
++ * on reading.
++ */
++#define I2C_CLC_RMC_MASK 0x0000FF00
++/* field offset */
++#define I2C_CLC_RMC_OFFSET 8
++
++/* Fields of "I2C Identification Register" */
++/* Module ID */
++#define I2C_ID_ID_MASK 0x0000FF00
++/* field offset */
++#define I2C_ID_ID_OFFSET 8
++/* Revision */
++#define I2C_ID_REV_MASK 0x000000FF
++/* field offset */
++#define I2C_ID_REV_OFFSET 0
++
++/* Fields of "I2C Interrupt Mask Control Register" */
++/* Enable */
++#define I2C_IMSC_BREQ_INT_EN 0x00000008
++/* Enable */
++#define I2C_IMSC_LBREQ_INT_EN 0x00000004
++
++/* Fields of "I2C Fractional Divider Configuration Register" */
++/* field offset */
++#define I2C_FDIV_CFG_INC_OFFSET 16
++
++/* Fields of "I2C Interrupt Mask Control Register" */
++/* Enable */
++#define I2C_IMSC_I2C_P_INT_EN 0x00000020
++/* Enable */
++#define I2C_IMSC_I2C_ERR_INT_EN 0x00000010
++
++/* Fields of "I2C Error Interrupt Request Source Status Register" */
++/* TXF_OFL */
++#define I2C_ERR_IRQSS_TXF_OFL 0x00000008
++/* TXF_UFL */
++#define I2C_ERR_IRQSS_TXF_UFL 0x00000004
++/* RXF_OFL */
++#define I2C_ERR_IRQSS_RXF_OFL 0x00000002
++/* RXF_UFL */
++#define I2C_ERR_IRQSS_RXF_UFL 0x00000001
++
++/* Fields of "I2C Raw Interrupt Status Register" */
++/* Read: Interrupt occurred. */
++#define I2C_RIS_I2C_ERR_INT_INTOCC 0x00000010
++/* Read: Interrupt occurred. */
++#define I2C_RIS_I2C_P_INT_INTOCC 0x00000020
++
++/* Fields of "I2C FIFO Configuration Register" */
++/* TX FIFO Flow Control */
++#define I2C_FIFO_CFG_TXFC 0x00020000
++/* RX FIFO Flow Control */
++#define I2C_FIFO_CFG_RXFC 0x00010000
++/* Word aligned (character alignment of four characters) */
++#define I2C_FIFO_CFG_TXFA_TXFA2 0x00002000
++/* Word aligned (character alignment of four characters) */
++#define I2C_FIFO_CFG_RXFA_RXFA2 0x00000200
++/* 1 word */
++#define I2C_FIFO_CFG_TXBS_TXBS0 0x00000000
++
++/* Fields of "I2C FIFO Configuration Register" */
++/* 1 word */
++#define I2C_FIFO_CFG_RXBS_RXBS0 0x00000000
++/* Stop on Packet End Enable */
++#define I2C_ADDR_CFG_SOPE_EN 0x00200000
++/* Stop on Not Acknowledge Enable */
++#define I2C_ADDR_CFG_SONA_EN 0x00100000
++/* Enable */
++#define I2C_ADDR_CFG_MnS_EN 0x00080000
++
++/* Fields of "I2C Interrupt Clear Register" */
++/* Clear */
++#define I2C_ICR_BREQ_INT_CLR 0x00000008
++/* Clear */
++#define I2C_ICR_LBREQ_INT_CLR 0x00000004
++
++/* Fields of "I2C Fractional Divider Configuration Register" */
++/* field offset */
++#define I2C_FDIV_CFG_DEC_OFFSET 0
++
++/* Fields of "I2C Bus Status Register" */
++/* Bus Status */
++#define I2C_BUS_STAT_BS_MASK 0x00000003
++/* Read from I2C Bus. */
++#define I2C_BUS_STAT_RNW_READ 0x00000004
++/* I2C Bus is free. */
++#define I2C_BUS_STAT_BS_FREE 0x00000000
++/*
++ * The device is working as master and has claimed the control on the
++ * I2C-bus (busy master).
++ */
++#define I2C_BUS_STAT_BS_BM 0x00000002
++
++/* Fields of "I2C RUN Control Register" */
++/* Enable */
++#define I2C_RUN_CTRL_RUN_EN 0x00000001
++
++/* Fields of "I2C End Data Control Register" */
++/*
++ * Set End of Transmission
++ * Note:Do not write '1' to this bit when bus is free. This will cause an
++ * abort after the first byte when a new transfer is started.
++ */
++#define I2C_ENDD_CTRL_SETEND 0x00000002
++
++/* Fields of "I2C Protocol Interrupt Request Source Status Register" */
++/* NACK */
++#define I2C_P_IRQSS_NACK 0x00000010
++/* AL */
++#define I2C_P_IRQSS_AL 0x00000008
++/* RX */
++#define I2C_P_IRQSS_RX 0x00000040
++/* TX_END */
++#define I2C_P_IRQSS_TX_END 0x00000020
++
++
++#endif /* I2C_LANTIQ_H */