--- /dev/null
+/*
+ * Lantiq FALC(tm) ON - 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) 2010 Thomas Langer <thomas.langer@lantiq.com>
+ */
+
+/*
+ * CURRENT ISSUES:
+ * - no high speed support
+ * - supports only master mode
+ * - ten bit mode is not tested (no slave devices)
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/clk.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+
+#include <lantiq_soc.h>
+
+/* 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
+
+/* 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
+
+/* I2C Bus Status Register */
+/* Bus Status */
+#define I2C_BUS_STAT_BS_MASK 0x00000003
+/* 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
+
+/* I2C Interrupt Clear Register */
+/* Clear */
+#define I2C_ICR_BREQ_INT_CLR 0x00000008
+/* Clear */
+#define I2C_ICR_LBREQ_INT_CLR 0x00000004
+
+/* I2C RUN Control Register */
+/* Enable */
+#define I2C_RUN_CTRL_RUN_EN 0x00000001
+
+/* I2C Kernel Clock Control Register */
+/* field offset */
+#define I2C_CLC_RMC_OFFSET 8
+/* Enable */
+#define I2C_IMSC_I2C_P_INT_EN 0x00000020
+/* Enable */
+#define I2C_IMSC_I2C_ERR_INT_EN 0x00000010
+/* Enable */
+#define I2C_IMSC_BREQ_INT_EN 0x00000008
+/* Enable */
+#define I2C_IMSC_LBREQ_INT_EN 0x00000004
+
+/* I2C Fractional Divider Configuration Register */
+/* field offset */
+#define I2C_FDIV_CFG_INC_OFFSET 16
+/* field offset */
+#define I2C_FDIV_CFG_DEC_OFFSET 0
+
+/* I2C Fractional Divider (highspeed mode) Configuration Register */
+/* field offset */
+#define I2C_FDIV_HIGH_CFG_INC_OFFSET 16
+/* field offset */
+#define I2C_FDIV_HIGH_CFG_DEC_OFFSET 0
+
+/* I2C Address Register */
+/* Enable */
+#define I2C_ADDR_CFG_SOPE_EN 0x00200000
+/* Enable */
+#define I2C_ADDR_CFG_SONA_EN 0x00100000
+/* Enable */
+#define I2C_ADDR_CFG_MnS_EN 0x00080000
+
+/* I2C Protocol Interrupt Request Source Status Register */
+/* RX */
+#define I2C_P_IRQSS_RX 0x00000040
+/* TX_END */
+#define I2C_P_IRQSS_TX_END 0x00000020
+/* NACK */
+#define I2C_P_IRQSS_NACK 0x00000010
+/* AL */
+#define I2C_P_IRQSS_AL 0x00000008
+
+/* I2C Raw Interrupt Status Register */
+/* Read: Interrupt occurred. */
+#define I2C_RIS_I2C_P_INT_INTOCC 0x00000020
+/* Read: Interrupt occurred. */
+#define I2C_RIS_I2C_ERR_INT_INTOCC 0x00000010
+
+/* 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
+/* 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
+/* 1 word */
+#define I2C_FIFO_CFG_RXBS_RXBS0 0x00000000
+
+
+/* I2C register structure */
+struct gpon_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 */
+};
+
+/* mapping for access macros */
+#define i2c ((struct gpon_reg_i2c *)priv->membase)
+#define reg_r32(reg) __raw_readl(reg)
+#define reg_w32(val, reg) __raw_writel(val, reg)
+#define reg_w32_mask(clear, set, reg) \
+ reg_w32((reg_r32(reg) & ~(clear)) | (set), reg)
+#define reg_r32_table(reg, idx) reg_r32(&((uint32_t *)®)[idx])
+#define reg_w32_table(val, reg, idx) reg_w32(val, &((uint32_t *)®)[idx])
+
+#define i2c_r32(reg) reg_r32(&i2c->reg)
+#define i2c_w32(val, reg) reg_w32(val, &i2c->reg)
+#define i2c_w32_mask(clear, set, reg) reg_w32_mask(clear, set, &i2c->reg)
+
+#define DRV_NAME "i2c-falcon"
+#define DRV_VERSION "1.01"
+
+#define FALCON_I2C_BUSY_TIMEOUT 20 /* ms */
+
+#ifdef DEBUG
+#define FALCON_I2C_XFER_TIMEOUT (25 * HZ)
+#else
+#define FALCON_I2C_XFER_TIMEOUT HZ
+#endif
+#if defined(DEBUG) && 0
+#define PRINTK(arg...) pr_info(arg)
+#else
+#define PRINTK(arg...) do {} while (0)
+#endif
+
+#define FALCON_I2C_IMSC_DEFAULT_MASK (I2C_IMSC_I2C_P_INT_EN | \
+ I2C_IMSC_I2C_ERR_INT_EN)
+
+#define FALCON_I2C_ARB_LOST (1 << 0)
+#define FALCON_I2C_NACK (1 << 1)
+#define FALCON_I2C_RX_UFL (1 << 2)
+#define FALCON_I2C_RX_OFL (1 << 3)
+#define FALCON_I2C_TX_UFL (1 << 4)
+#define FALCON_I2C_TX_OFL (1 << 5)
+
+struct falcon_i2c {
+ struct mutex mutex;
+
+ enum {
+ FALCON_I2C_MODE_100 = 1,
+ FALCON_I2C_MODE_400 = 2,
+ FALCON_I2C_MODE_3400 = 3
+ } mode; /* current speed mode */
+
+ struct clk *clk; /* clock input for i2c hardware block */
+ struct gpon_reg_i2c __iomem *membase; /* base of mapped registers */
+ int irq_lb, irq_b, irq_err, irq_p; /* last burst, burst, error,
+ protocol IRQs */
+
+ struct i2c_adapter adap;
+ struct device *dev;
+
+ struct completion cmd_complete;
+
+ /* message transfer data */
+ /* current message */
+ struct i2c_msg *current_msg;
+ /* number of messages to handle */
+ int msgs_num;
+ /* current buffer */
+ u8 *msg_buf;
+ /* remaining length of current buffer */
+ u32 msg_buf_len;
+ /* error status of the current transfer */
+ int msg_err;
+
+ /* master status codes */
+ enum {
+ STATUS_IDLE,
+ STATUS_ADDR, /* address phase */
+ STATUS_WRITE,
+ STATUS_READ,
+ STATUS_READ_END,
+ STATUS_STOP
+ } status;
+};
+
+static irqreturn_t falcon_i2c_isr(int irq, void *dev_id);
+
+static inline void enable_burst_irq(struct falcon_i2c *priv)
+{
+ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
+}
+static inline void disable_burst_irq(struct falcon_i2c *priv)
+{
+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
+}
+
+static void prepare_msg_send_addr(struct falcon_i2c *priv)
+{
+ struct i2c_msg *msg = priv->current_msg;
+ int rd = !!(msg->flags & I2C_M_RD);
+ 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 set_tx_len(struct falcon_i2c *priv)
+{
+ struct i2c_msg *msg = priv->current_msg;
+ int len = (msg->flags & I2C_M_TEN) ? 2 : 1;
+
+ PRINTK("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 falcon_i2c_hw_init(struct i2c_adapter *adap)
+{
+ struct falcon_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
+
+ /* set frequency */
+ if (priv->mode == FALCON_I2C_MODE_100) {
+ dev_dbg(priv->dev, "set standard mode (100 kHz)\n");
+ i2c_w32(0, fdiv_high_cfg);
+ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET) |
+ (499 << I2C_FDIV_CFG_DEC_OFFSET),
+ fdiv_cfg);
+ } else if (priv->mode == FALCON_I2C_MODE_400) {
+ dev_dbg(priv->dev, "set fast mode (400 kHz)\n");
+ i2c_w32(0, fdiv_high_cfg);
+ i2c_w32((1 << I2C_FDIV_CFG_INC_OFFSET) |
+ (124 << I2C_FDIV_CFG_DEC_OFFSET),
+ fdiv_cfg);
+ } else if (priv->mode == FALCON_I2C_MODE_3400) {
+ dev_dbg(priv->dev, "set high mode (3.4 MHz)\n");
+ i2c_w32(0, fdiv_cfg);
+ /* TODO recalculate value for 100MHz input */
+ i2c_w32((41 << I2C_FDIV_HIGH_CFG_INC_OFFSET) |
+ (152 << I2C_FDIV_HIGH_CFG_DEC_OFFSET),
+ fdiv_high_cfg);
+ } else {
+ dev_warn(priv->dev, "unknown mode\n");
+ return -ENODEV;
+ }
+
+ /* 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 falcon_i2c_wait_bus_not_busy(struct falcon_i2c *priv)
+{
+ int timeout = FALCON_I2C_BUSY_TIMEOUT;
+
+ while ((i2c_r32(bus_stat) & I2C_BUS_STAT_BS_MASK)
+ != I2C_BUS_STAT_BS_FREE) {
+ if (timeout <= 0) {
+ dev_warn(priv->dev, "timeout waiting for bus ready\n");
+ return -ETIMEDOUT;
+ }
+ timeout--;
+ mdelay(1);
+ }
+
+ return 0;
+}
+
+static void falcon_i2c_tx(struct falcon_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 falcon_i2c_rx(struct falcon_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;
+ PRINTK("\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;
+ }
+ #if 0
+ fifo_stat = i2c_r32(ffs_stat);
+ #else
+ /* do not read more than burst size, otherwise no "last
+ burst" is generated and the transaction is blocked! */
+ fifo_stat = 0;
+ #endif
+ }
+ } 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 falcon_i2c_xfer_init(struct falcon_i2c *priv)
+{
+ /* enable interrupts */
+ i2c_w32(FALCON_I2C_IMSC_DEFAULT_MASK, imsc);
+
+ /* trigger transfer of first msg */
+ set_tx_len(priv);
+}
+
+static void dump_msgs(struct i2c_msg msgs[], int num, int rx)
+{
+#if defined(DEBUG)
+ int i, j;
+ pr_info("Messages %d %s\n", num, rx ? "out" : "in");
+ for (i = 0; i < num; i++) {
+ pr_info("%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++)
+ printk("%02X ", msgs[i].buf[j]);
+ }
+ printk("\n");
+ }
+#endif
+}
+
+static void falcon_i2c_release_bus(struct falcon_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 falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
+ int num)
+{
+ struct falcon_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 = falcon_i2c_wait_bus_not_busy(priv);
+ if (ret)
+ goto done;
+
+ while (priv->msgs_num) {
+ /* start the transfers */
+ falcon_i2c_xfer_init(priv);
+
+ /* wait for transfers to complete */
+ ret = wait_for_completion_interruptible_timeout(
+ &priv->cmd_complete, FALCON_I2C_XFER_TIMEOUT);
+ if (ret == 0) {
+ dev_err(priv->dev, "controller timed out\n");
+ falcon_i2c_hw_init(adap);
+ ret = -ETIMEDOUT;
+ goto done;
+ } else if (ret < 0)
+ goto done;
+
+ if (priv->msg_err) {
+ if (priv->msg_err & FALCON_I2C_NACK)
+ ret = -ENXIO;
+ else
+ ret = -EREMOTEIO;
+ goto done;
+ }
+ if (--priv->msgs_num)
+ priv->current_msg++;
+ }
+ /* no error? */
+ ret = num;
+
+done:
+ falcon_i2c_release_bus(priv);
+
+ mutex_unlock(&priv->mutex);
+
+ if (ret >= 0)
+ dump_msgs(msgs, num, 1);
+
+ PRINTK("XFER ret %d\n", ret);
+ return ret;
+}
+
+static irqreturn_t falcon_i2c_isr_burst(int irq, void *dev_id)
+{
+ struct falcon_i2c *priv = dev_id;
+ struct i2c_msg *msg = priv->current_msg;
+ int last = (irq == priv->irq_lb);
+
+ if (last)
+ PRINTK("LB ");
+ else
+ PRINTK("B ");
+
+ if (msg->flags & I2C_M_RD) {
+ switch (priv->status) {
+ case STATUS_ADDR:
+ PRINTK("X");
+ prepare_msg_send_addr(priv);
+ disable_burst_irq(priv);
+ break;
+ case STATUS_READ:
+ case STATUS_READ_END:
+ PRINTK("R");
+ falcon_i2c_rx(priv, last);
+ break;
+ default:
+ disable_burst_irq(priv);
+ PRINTK("Status R %d\n", priv->status);
+ break;
+ }
+ } else {
+ switch (priv->status) {
+ case STATUS_ADDR:
+ PRINTK("x");
+ prepare_msg_send_addr(priv);
+ break;
+ case STATUS_WRITE:
+ PRINTK("w");
+ falcon_i2c_tx(priv, last);
+ break;
+ default:
+ disable_burst_irq(priv);
+ PRINTK("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 falcon_i2c_isr_prot(struct falcon_i2c *priv)
+{
+ u32 i_pro = i2c_r32(p_irqss);
+
+ PRINTK("i2c-p");
+
+ /* not acknowledge */
+ if (i_pro & I2C_P_IRQSS_NACK) {
+ priv->msg_err |= FALCON_I2C_NACK;
+ PRINTK(" nack");
+ }
+
+ /* arbitration lost */
+ if (i_pro & I2C_P_IRQSS_AL) {
+ priv->msg_err |= FALCON_I2C_ARB_LOST;
+ PRINTK(" arb-lost");
+ }
+ /* tx -> rx switch */
+ if (i_pro & I2C_P_IRQSS_RX)
+ PRINTK(" rx");
+
+ /* tx end */
+ if (i_pro & I2C_P_IRQSS_TX_END)
+ PRINTK(" txend");
+ PRINTK("\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 falcon_i2c_isr(int irq, void *dev_id)
+{
+ u32 i_raw, i_err = 0;
+ struct falcon_i2c *priv = dev_id;
+
+ i_raw = i2c_r32(mis);
+ PRINTK("i_raw 0x%08X\n", i_raw);
+
+ /* error interrupt */
+ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) {
+ i_err = i2c_r32(err_irqss);
+ PRINTK("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 |= FALCON_I2C_TX_OFL;
+
+ /* tx fifo underflow (4) */
+ if (i_err & I2C_ERR_IRQSS_TXF_UFL)
+ priv->msg_err |= FALCON_I2C_TX_UFL;
+
+ /* rx fifo overflow (2) */
+ if (i_err & I2C_ERR_IRQSS_RXF_OFL)
+ priv->msg_err |= FALCON_I2C_RX_OFL;
+
+ /* rx fifo underflow (1) */
+ if (i_err & I2C_ERR_IRQSS_RXF_UFL)
+ priv->msg_err |= FALCON_I2C_RX_UFL;
+
+ i2c_w32(i_err, err_irqsc);
+ }
+
+ /* protocol interrupt */
+ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC)
+ falcon_i2c_isr_prot(priv);
+
+ if ((priv->msg_err) || (priv->status == STATUS_STOP))
+ complete(&priv->cmd_complete);
+
+ return IRQ_HANDLED;
+}
+
+static u32 falcon_i2c_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C |
+ I2C_FUNC_10BIT_ADDR |
+ I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm falcon_i2c_algorithm = {
+ .master_xfer = falcon_i2c_xfer,
+ .functionality = falcon_i2c_functionality,
+};
+
+static int __devinit falcon_i2c_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct falcon_i2c *priv;
+ struct i2c_adapter *adap;
+ struct resource *mmres, *ioarea,
+ *irqres_lb, *irqres_b, *irqres_err, *irqres_p;
+ struct clk *clk;
+
+ dev_dbg(&pdev->dev, "probing\n");
+
+ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irqres_lb = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ "i2c_lb");
+ irqres_b = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_b");
+ irqres_err = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ "i2c_err");
+ irqres_p = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "i2c_p");
+
+ if (!mmres || !irqres_lb || !irqres_b || !irqres_err || !irqres_p) {
+ dev_err(&pdev->dev, "no resources\n");
+ return -ENODEV;
+ }
+
+ clk = clk_get_fpi();
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to get fpi clk\n");
+ return -ENOENT;
+ }
+
+ if (clk_get_rate(clk) != 100000000) {
+ dev_err(&pdev->dev, "input clock is not 100MHz\n");
+ return -ENOENT;
+ }
+ clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "failed to get i2c clk\n");
+ return -ENOENT;
+ }
+ clk_activate(clk);
+ /* allocate private data */
+ priv = kzalloc(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 = &falcon_i2c_algorithm;
+
+ priv->mode = FALCON_I2C_MODE_100;
+ priv->clk = clk;
+ priv->dev = &pdev->dev;
+
+ init_completion(&priv->cmd_complete);
+ mutex_init(&priv->mutex);
+
+ if (ltq_gpio_request(&pdev->dev, 107, 0, 0, DRV_NAME":sda") ||
+ ltq_gpio_request(&pdev->dev, 108, 0, 0, DRV_NAME":scl"))
+ {
+ dev_err(&pdev->dev, "I2C gpios not available\n");
+ ret = -ENXIO;
+ goto err_free_priv;
+ }
+
+ ioarea = request_mem_region(mmres->start, resource_size(mmres),
+ pdev->name);
+
+ if (ioarea == NULL) {
+ dev_err(&pdev->dev, "I2C region already claimed\n");
+ ret = -ENXIO;
+ goto err_free_gpio;
+ }
+
+ /* map memory */
+ priv->membase = ioremap_nocache(mmres->start & ~KSEG1,
+ resource_size(mmres));
+ if (priv->membase == NULL) {
+ ret = -ENOMEM;
+ goto err_release_region;
+ }
+
+ priv->irq_lb = irqres_lb->start;
+ ret = request_irq(priv->irq_lb, falcon_i2c_isr_burst, IRQF_DISABLED,
+ irqres_lb->name, priv);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get last burst IRQ %d\n",
+ irqres_lb->start);
+ ret = -ENODEV;
+ goto err_unmap_mem;
+ }
+
+ priv->irq_b = irqres_b->start;
+ ret = request_irq(priv->irq_b, falcon_i2c_isr_burst, IRQF_DISABLED,
+ irqres_b->name, priv);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get burst IRQ %d\n",
+ irqres_b->start);
+ ret = -ENODEV;
+ goto err_free_lb_irq;
+ }
+
+ priv->irq_err = irqres_err->start;
+ ret = request_irq(priv->irq_err, falcon_i2c_isr, IRQF_DISABLED,
+ irqres_err->name, priv);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get error IRQ %d\n",
+ irqres_err->start);
+ ret = -ENODEV;
+ goto err_free_b_irq;
+ }
+
+ priv->irq_p = irqres_p->start;
+ ret = request_irq(priv->irq_p, falcon_i2c_isr, IRQF_DISABLED,
+ irqres_p->name, priv);
+ if (ret) {
+ dev_err(&pdev->dev, "can't get protocol IRQ %d\n",
+ irqres_p->start);
+ ret = -ENODEV;
+ goto err_free_err_irq;
+ }
+
+ dev_dbg(&pdev->dev, "mapped io-space to %p\n", priv->membase);
+ dev_dbg(&pdev->dev, "use IRQs %d, %d, %d, %d\n", irqres_lb->start,
+ irqres_b->start, irqres_err->start, irqres_p->start);
+
+ /* 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 err_free_p_irq;
+ }
+
+ 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 = falcon_i2c_hw_init(adap);
+ if (ret) {
+ dev_err(&pdev->dev, "can't configure adapter\n");
+ goto err_remove_adapter;
+ }
+
+ dev_info(&pdev->dev, "version %s\n", DRV_VERSION);
+
+ return 0;
+
+err_remove_adapter:
+ i2c_del_adapter(adap);
+ platform_set_drvdata(pdev, NULL);
+
+err_free_p_irq:
+ free_irq(priv->irq_p, priv);
+
+err_free_err_irq:
+ free_irq(priv->irq_err, priv);
+
+err_free_b_irq:
+ free_irq(priv->irq_b, priv);
+
+err_free_lb_irq:
+ free_irq(priv->irq_lb, priv);
+
+err_unmap_mem:
+ iounmap(priv->membase);
+
+err_release_region:
+ release_mem_region(mmres->start, resource_size(mmres));
+
+err_free_gpio:
+ gpio_free(108);
+ gpio_free(107);
+
+err_free_priv:
+ kfree(priv);
+
+ return ret;
+}
+
+static int __devexit falcon_i2c_remove(struct platform_device *pdev)
+{
+ struct falcon_i2c *priv = platform_get_drvdata(pdev);
+ struct resource *mmres;
+
+ /* disable bus */
+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
+
+ /* remove driver */
+ platform_set_drvdata(pdev, NULL);
+ i2c_del_adapter(&priv->adap);
+
+ free_irq(priv->irq_lb, priv);
+ free_irq(priv->irq_b, priv);
+ free_irq(priv->irq_err, priv);
+ free_irq(priv->irq_p, priv);
+
+ iounmap(priv->membase);
+
+ gpio_free(108);
+ gpio_free(107);
+
+ kfree(priv);
+
+ mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(mmres->start, resource_size(mmres));
+
+ dev_dbg(&pdev->dev, "removed\n");
+
+ return 0;
+}
+
+static struct platform_driver falcon_i2c_driver = {
+ .probe = falcon_i2c_probe,
+ .remove = __devexit_p(falcon_i2c_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init falcon_i2c_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&falcon_i2c_driver);
+
+ if (ret)
+ pr_debug(DRV_NAME ": can't register platform driver\n");
+
+ return ret;
+}
+
+static void __exit falcon_i2c_exit(void)
+{
+ platform_driver_unregister(&falcon_i2c_driver);
+}
+
+module_init(falcon_i2c_init);
+module_exit(falcon_i2c_exit);
+
+MODULE_DESCRIPTION("Lantiq FALC(tm) ON - I2C bus adapter");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
projects / openwrt.git / blobdiff