+++ /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
-@@ -691,6 +691,16 @@ 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
-@@ -67,6 +67,7 @@ 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 / openwrt.git / blobdiff