--- /dev/null
+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
+@@ -729,6 +729,16 @@ 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
+@@ -73,6 +73,7 @@ obj-$(CONFIG_I2C_IMX_LPI2C) += i2c-imx-l
+ obj-$(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 <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 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 = <q_i2c_algorithm;
++ adap->dev.parent = &pdev->dev;
++ adap->dev.of_node = pdev->dev.of_node;
++
++ 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_ioremap_resource(&pdev->dev, mmres);
++ if (IS_ERR(priv->membase))
++ return PTR_ERR(priv->membase);
++
++ 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);
++ goto out;
++ } else {
++ dev_info(&pdev->dev, "version %s\n", DRV_VERSION);
++ }
++
++out:
++ /* if init failed, we need to deactivate the clock gate */
++ if (ret)
++ clk_deactivate(priv->clk_gate);
++
++ return ret;
++}
++
++static int 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 = 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 */
projects / openwrt / staging / mkresin.git / blobdiff