ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
-@@ -282,6 +282,10 @@ config I2C_POWERMAC
+@@ -284,6 +284,10 @@ config I2C_POWERMAC
comment "I2C system bus drivers (mostly embedded / system-on-chip)"
depends on ARCH_AT91 && EXPERIMENTAL && BROKEN
--- /dev/null
+++ b/drivers/i2c/busses/i2c-falcon.c
-@@ -0,0 +1,803 @@
+@@ -0,0 +1,815 @@
+/*
-+ * 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.
++ * Lantiq FALC(tm) ON - I2C bus adapter
+ *
-+ * 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.
++ * Parts based on i2c-designware.c and other i2c drivers from Linux 2.6.33
+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
++ * 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.
+ */
+
+/* #define DEBUG */
+
++#include <linux/kernel.h>
+#include <linux/module.h>
-+#include <linux/ioport.h>
-+#include <linux/init.h>
-+#include <linux/platform_device.h>
++#include <linux/delay.h>
++#include <linux/slab.h> /* for kzalloc, kfree */
+#include <linux/i2c.h>
-+#include <linux/interrupt.h>
-+#include <linux/spinlock.h>
-+#include <linux/io.h>
+#include <linux/clk.h>
++#include <linux/errno.h>
++#include <linux/sched.h>
+#include <linux/err.h>
-+#include <linux/slab.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/gpio.h>
++
++#include <falcon/lantiq_soc.h>
+
+/* CURRENT ISSUES:
+ * - no high speed support
-+ * - rx issue with "address mode" & "tx end" interrupts
-+ * - ten bit mode is not tested
++ * - supports only master mode
++ * - ten bit mode is not tested (no slave devices)
+ */
+
+/* mapping for access macros */
+#define i2c (priv->membase)
+#include <falcon/i2c_reg.h>
+
-+/* enable hacks to overcome current issue */
-+#define FALCON_FIX_ME
-+
-+#define FALCON_I2C_ADDR 0x00
-+#define FALCON_I2C_READY_TIMEOUT 1000
-+#define FALCON_I2C_WAIT_TIMEOUT 10
-+
+#define DRV_NAME "i2c-falcon"
++#define DRV_VERSION "1.01"
+
-+#if defined(DEBUG)
-+#define static /* no static functions for better debugging */
++#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...) printk(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)
-+#define FALCON_I2C_BURST_REQ (1 << 6)
-+#define FALCON_I2C_RX (1 << 7)
-+#define FALCON_I2C_TX_END (1 << 8)
-+#define FALCON_I2C_ADDR_MATCH (1 << 9) /* doesn't trigger */
+
+struct falcon_i2c {
-+ spinlock_t lock;
++ struct mutex mutex;
+
+ enum {
+ FALCON_I2C_MODE_100 = 1,
+ FALCON_I2C_MODE_3400 = 3
+ } mode; /* current speed mode */
+
-+ int ten_bit; /* current address mode */
-+ unsigned long status; /* bus events holder */
+ 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 completion done;
++
+ struct i2c_adapter adap;
+ struct device *dev;
-+};
+
-+#define FALCON_I2C_ERROR_MASK (FALCON_I2C_NACK \
-+ | FALCON_I2C_ARB_LOST \
-+ | FALCON_I2C_RX_OFL \
-+ | FALCON_I2C_RX_UFL \
-+ | FALCON_I2C_TX_OFL \
-+ | FALCON_I2C_TX_UFL)
++ 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;
++};
+
-+#define FALCON_I2C_ERROR(priv) (priv->status & FALCON_I2C_ERROR_MASK)
-+#define FALCON_I2C_ERROR_CLEAR(priv) do { \
-+ priv->status &= \
-+ ~FALCON_I2C_ERROR_MASK; \
-+ } while (0)
++static irqreturn_t falcon_i2c_isr(int irq, void *dev_id);
+
-+static void falcon_addr_configure(struct falcon_i2c *priv, int ten_bit)
++static inline void enable_burst_irq(struct falcon_i2c *priv)
+{
-+ u32 ten_bit_mask = ten_bit ? I2C_ADDR_CFG_TBAM_10bit : 0;
-+
-+ /* 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 */
-+ | ten_bit_mask
-+ | FALCON_I2C_ADDR, /* our address */
-+ addr_cfg);
++ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
+}
-+
-+static irqreturn_t falcon_i2c_isr(int irq, void *dev_id)
++static inline void disable_burst_irq(struct falcon_i2c *priv)
+{
-+ u32 i_raw, i_pro, i_err;
-+ struct falcon_i2c *priv = dev_id;
-+ unsigned long flags;
-+ unsigned int old_status;
-+
-+ spin_lock_irqsave(&priv->lock, flags);
-+
-+ old_status = (unsigned int)priv->status;
-+
-+ i_raw = i2c_r32(mis);
-+
-+ /* protocol interrupt */
-+ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC) {
-+ i_pro = i2c_r32(p_irqss);
++ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
++}
+
-+ /* tx -> rx switch */
-+ if (i_pro & I2C_P_IRQSS_RX)
-+ priv->status |= FALCON_I2C_RX;
++static void prepare_msg_send_addr(struct falcon_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;
+
-+ /* tx end */
-+ if (i_pro & I2C_P_IRQSS_TX_END)
-+ priv->status |= FALCON_I2C_TX_END;
++ /* 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);
++}
+
-+ /* not acknowledge */
-+ if (i_pro & I2C_P_IRQSS_NACK)
-+ priv->status |= FALCON_I2C_NACK;
++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;
+
-+ /* arbitration lost */
-+ if (i_pro & I2C_P_IRQSS_AL)
-+ priv->status |= FALCON_I2C_ARB_LOST;
++ PRINTK("set_tx_len %cX\n", (msg->flags & I2C_M_RD)?'R':'T');
+
-+ /* address match */
-+ if (i_pro & I2C_P_IRQSS_AM)
-+ priv->status |= FALCON_I2C_ADDR_MATCH;
++ priv->status = STATUS_ADDR;
+
-+ i2c_w32(i_pro, p_irqsc);
++ 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);
++}
+
-+ /* error interrupt */
-+ if (i_raw & I2C_RIS_I2C_ERR_INT_INTOCC) {
-+ i_err = i2c_r32(err_irqss);
-+
-+ /* tx fifo overflow */
-+ if (i_err & I2C_ERR_IRQSS_TXF_OFL)
-+ priv->status |= FALCON_I2C_TX_OFL;
-+
-+ /* tx fifo underflow */
-+ if (i_err & I2C_ERR_IRQSS_TXF_UFL)
-+ priv->status |= FALCON_I2C_TX_UFL;
-+
-+ /* rx fifo overflow */
-+ if (i_err & I2C_ERR_IRQSS_RXF_OFL)
-+ priv->status |= FALCON_I2C_RX_OFL;
-+
-+ /* rx fifo underflow */
-+ if (i_err & I2C_ERR_IRQSS_RXF_UFL)
-+ priv->status |= FALCON_I2C_RX_UFL;
++static int falcon_i2c_hw_init(struct i2c_adapter *adap)
++{
++ struct falcon_i2c *priv = i2c_get_adapdata(adap);
+
-+ i2c_w32(i_err, err_irqsc);
-+ }
++ /* disable bus */
++ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
+
-+ /* burst request */
-+ if (i_raw & I2C_RIS_BREQ_INT_INTOCC) {
-+ i2c_w32_mask(I2C_IMSC_BREQ_INT_EN, 0, imsc);
-+ i2c_w32_mask(0, I2C_ICR_BREQ_INT_CLR, icr);
++#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
+
-+ priv->status |= FALCON_I2C_BURST_REQ;
++ /* 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;
+ }
+
-+ /* last burst request */
-+ if (i_raw & I2C_RIS_LBREQ_INT_INTOCC) {
-+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN, 0, imsc);
-+ i2c_w32_mask(0, I2C_ICR_LBREQ_INT_CLR, icr);
-+
-+ priv->status |= FALCON_I2C_BURST_REQ;
-+ }
++ /* 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);
+
-+ if (old_status != (unsigned int)priv->status)
-+ complete(&priv->done);
++ /* 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);
+
-+ spin_unlock_irqrestore(&priv->lock, flags);
++ /* enable bus */
++ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
+
-+ return IRQ_HANDLED;
++ return 0;
+}
+
-+static int falcon_i2c_ready(struct falcon_i2c *priv)
++static int falcon_i2c_wait_bus_not_busy(struct falcon_i2c *priv)
+{
-+ int timeout;
-+ u32 bus_stat;
-+ unsigned long flags;
-+ int ret;
-+
-+ for (timeout = 0; timeout < FALCON_I2C_READY_TIMEOUT; timeout++) {
-+ bus_stat = i2c_r32(bus_stat);
-+
-+ if (bus_stat & I2C_BUS_STAT_BS_SC) {
-+ cpu_relax();
-+ } else {
-+ spin_lock_irqsave(&priv->lock, flags);
++ int timeout = FALCON_I2C_BUSY_TIMEOUT;
+
-+ if (FALCON_I2C_ERROR(priv)) {
-+ ret = priv->status;
-+
-+ dev_dbg(priv->dev, "bus ready wait error 0x%08lx\n", priv->status);
-+
-+ FALCON_I2C_ERROR_CLEAR(priv);
-+ } else {
-+ ret = 0;
-+ }
-+
-+ spin_unlock_irqrestore(&priv->lock, flags);
-+
-+ return ret;
++ 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);
+ }
+
-+ dev_dbg(priv->dev, "bus ready wait timeout\n");
-+
-+ return -ETIME;
++ return 0;
+}
+
-+static int falcon_i2c_wait(struct falcon_i2c *priv, unsigned long status)
++static void falcon_i2c_tx(struct falcon_i2c *priv, int last)
+{
-+ int ret = 0;
-+ unsigned long flags;
-+ unsigned int timeout;
-+
-+ spin_lock_irqsave(&priv->lock, flags);
-+
-+ priv->status &= FALCON_I2C_BURST_REQ;
-+
-+ /* check if the event already occurred */
-+ if ((priv->status & status) == status) {
-+ priv->status &= ~status;
-+ spin_unlock_irqrestore(&priv->lock, flags);
-+
-+ return 0;
++ 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);
+ }
++}
+
-+ spin_unlock_irqrestore(&priv->lock, flags);
-+
-+ /* unmask burst interrupts */
-+ i2c_w32_mask(0, I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, imsc);
-+
-+ for (timeout = 0; timeout < FALCON_I2C_WAIT_TIMEOUT; timeout++) {
-+ /* wait for the data request */
-+ wait_for_completion_timeout(&priv->done, HZ / 10);
-+
-+ /* handle errors */
-+ spin_lock_irqsave(&priv->lock, flags);
-+
-+ if (FALCON_I2C_ERROR(priv)) {
-+ dev_dbg(priv->dev, "wait error 0x%08lx (waiting for 0x%08lx)\n",
-+ priv->status,
-+ status);
-+
-+ if (priv->status & FALCON_I2C_NACK)
-+ ret = -ENXIO;
-+ else
-+ ret = -EREMOTEIO;
-+
-+ FALCON_I2C_ERROR_CLEAR(priv);
-+ } else {
-+ if ((priv->status & status) == status) {
-+ priv->status &= ~status;
-+ spin_unlock_irqrestore(&priv->lock, flags);
-+
-+ return 0;
++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;
+ }
-+
-+ spin_unlock_irqrestore(&priv->lock, flags);
-+
-+ if (ret)
-+ return ret;
+ }
-+
-+ dev_dbg(priv->dev, "wait timeout error 0x%08lx (waiting for 0x%08lx)\n",
-+ priv->status,
-+ status);
-+
-+ return -ETIME;
+}
+
-+static int falcon_i2c_tx(struct falcon_i2c *priv, int ten_bit, u16 addr,
-+ u8 *buf, int len)
++static void falcon_i2c_xfer_init(struct falcon_i2c *priv)
+{
-+ int i;
-+ int ret;
-+
-+ dev_dbg(priv->dev, "%s\n", __func__);
-+
-+ /* tell fifo the number of bytes we are going to send */
-+ i2c_w32(len + (ten_bit ? 2 : 1), tps_ctrl);
-+
-+ /* wait for the data request */
-+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
-+ if (ret)
-+ return ret;
-+
-+ /* send slave address */
-+ if (ten_bit) {
-+ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd);
-+ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 0, txd);
-+ } else {
-+ i2c_w32((addr << 1) | 0, txd);
-+ }
++ /* enable interrupts */
++ i2c_w32(FALCON_I2C_IMSC_DEFAULT_MASK, imsc);
+
-+ /* fill fifo */
-+ for (i = 0; i < len; i++) {
-+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
-+ if (ret)
-+ return ret;
++ /* trigger transfer of first msg */
++ set_tx_len(priv);
++}
+
-+ i2c_w32(buf[i], txd);
++static void dump_msgs(struct i2c_msg msgs[], int num, int rx)
++{
++#if defined(DEBUG)
++ int i, j;
++ printk("Messages %d %s\n", num, rx ? "out" : "in");
++ for (i = 0; i < num; i++) {
++ printk("%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
++}
+
-+ return falcon_i2c_wait(priv, FALCON_I2C_TX_END);
++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_rx(struct falcon_i2c *priv, int ten_bit, u16 addr,
-+ u8 *buf, int len)
++static int falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
++ int num)
+{
-+ int i;
++ struct falcon_i2c *priv = i2c_get_adapdata(adap);
+ int ret;
+
-+ dev_dbg(priv->dev, "%s\n", __func__);
++ dev_dbg(priv->dev, "xfer %u messages\n", num);
++ dump_msgs(msgs, num, 0);
+
-+ /* we need to transmit address only */
-+ i2c_w32(ten_bit ? 2 : 1, tps_ctrl);
++ mutex_lock(&priv->mutex);
+
-+ /* set maximum received packet size */
-+ i2c_w32(len, mrps_ctrl);
++ INIT_COMPLETION(priv->cmd_complete);
++ priv->current_msg = msgs;
++ priv->msgs_num = num;
++ priv->msg_err = 0;
++ priv->status = STATUS_IDLE;
+
-+ /* wait for the data request */
-+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
++ /* wait for the bus to become ready */
++ ret = falcon_i2c_wait_bus_not_busy(priv);
+ if (ret)
-+ return ret;
-+
-+ /* write down the address */
-+ if (ten_bit) {
-+ i2c_w32(0x78 | ((addr >> 7) & 0x7), txd);
-+ i2c_w32(0x78 | ((addr & 0x7f) << 1) | 1, txd);
-+ } else {
-+ i2c_w32((addr << 1) | 1, txd);
++ 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;
+
-+ /* wait for the read request */
-+ ret = falcon_i2c_wait(priv, FALCON_I2C_TX_END
-+#ifndef FALCON_FIX_ME
-+ | FALCON_I2C_ADDR_MATCH
-+#endif
-+ | FALCON_I2C_RX);
++done:
++ falcon_i2c_release_bus(priv);
+
-+ if (ret)
-+ return ret;
++ mutex_unlock(&priv->mutex);
+
-+ /* read bytes */
-+ for (i = 0; i < len; i++) {
-+#ifdef FALCON_FIX_ME
-+ while (i2c_r32(rps_stat) == 0)
-+ cpu_relax();
-+#else
-+ ret = falcon_i2c_wait(priv, FALCON_I2C_BURST_REQ);
-+
-+ if (ret)
-+ return ret;
-+#endif
-+
-+ buf[i] = i2c_r32(rxd);
-+ }
++ if (ret>=0)
++ dump_msgs(msgs, num, 1);
+
-+#ifndef FALCON_FIX_ME
-+ /* wait for transmission end */
-+ return falcon_i2c_wait(priv, FALCON_I2C_TX_END);
-+#else
-+ return 0;
-+#endif
++ PRINTK("XFER ret %d\n", ret);
++ return ret;
+}
+
-+static int falcon_i2c_xfer_msg(struct falcon_i2c *priv, struct i2c_msg *msg)
++static irqreturn_t falcon_i2c_isr_burst(int irq, void *dev_id)
+{
-+ int ret;
-+ int ten_bit;
-+ unsigned long flags;
-+
-+ dev_dbg(priv->dev, "%s %u byte(s) %s 0x%02x\n",
-+ (msg->flags & I2C_M_RD) ? "read" : "write", msg->len,
-+ (msg->flags & I2C_M_RD) ? "from" : "to", msg->addr);
++ struct falcon_i2c *priv = dev_id;
++ struct i2c_msg *msg = priv->current_msg;
++ int last = (irq == priv->irq_lb);
+
-+ if (msg->flags & I2C_M_TEN)
-+ ten_bit = 1;
++ if (last)
++ PRINTK("LB ");
+ else
-+ ten_bit = 0;
++ 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;
++ }
++ }
+
-+ /* reconfigure bus if need to send message in different address mode */
-+ spin_lock_irqsave(&priv->lock, flags);
-+ if (ten_bit != priv->ten_bit) {
++ i2c_w32(I2C_ICR_BREQ_INT_CLR | I2C_ICR_LBREQ_INT_CLR, icr);
++ return IRQ_HANDLED;
++}
+
-+ /* disable bus */
-+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
++static void falcon_i2c_isr_prot(struct falcon_i2c *priv)
++{
++ u32 i_pro = i2c_r32(p_irqss);
+
-+ /* reconfigure address */
-+ falcon_addr_configure(priv, ten_bit);
++ PRINTK("i2c-p");
+
-+ /* enable bus */
-+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
++ /* not acknowledge */
++ if (i_pro & I2C_P_IRQSS_NACK) {
++ priv->msg_err |= FALCON_I2C_NACK;
++ PRINTK(" nack");
++ }
+
-+ priv->ten_bit = ten_bit;
++ /* arbitration lost */
++ if (i_pro & I2C_P_IRQSS_AL) {
++ priv->msg_err |= FALCON_I2C_ARB_LOST;
++ PRINTK(" arb-lost");
+ }
-+ spin_unlock_irqrestore(&priv->lock, flags);
++ /* tx -> rx switch */
++ if (i_pro & I2C_P_IRQSS_RX)
++ PRINTK(" rx");
+
-+ /* read/write actual message */
-+ if (msg->flags & I2C_M_RD)
-+ ret = falcon_i2c_rx(priv, ten_bit, msg->addr, msg->buf,
-+ msg->len);
-+ else
-+ ret = falcon_i2c_tx(priv, ten_bit, msg->addr, msg->buf,
-+ msg->len);
++ /* tx end */
++ if (i_pro & I2C_P_IRQSS_TX_END)
++ PRINTK(" txend");
++ PRINTK("\n");
+
-+ if (ret)
-+ return ret;
++ 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;
++ }
++ }
++ }
+
-+ return 0;
++ i2c_w32(i_pro, p_irqsc);
+}
+
-+static int falcon_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
-+ int num)
++static irqreturn_t falcon_i2c_isr(int irq, void *dev_id)
+{
-+ int i;
-+ int ret;
-+ unsigned long flags;
-+ struct falcon_i2c *priv = i2c_get_adapdata(adap);
++ u32 i_raw, i_err=0;
++ struct falcon_i2c *priv = dev_id;
+
-+ dev_dbg(priv->dev, "xfer %u messages\n", num);
++ i_raw = i2c_r32(mis);
++ PRINTK("i_raw 0x%08X\n", i_raw);
+
-+ /* transfer each message */
-+ for (i = 0; i < num; i++) {
-+#ifdef FALCON_FIX_ME
-+ /* disable bus */
-+ i2c_w32_mask(I2C_RUN_CTRL_RUN_EN, 0, run_ctrl);
-+ /* enable bus */
-+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
-+#endif
++ /* 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));
+
-+ /* clear bus status */
-+ spin_lock_irqsave(&priv->lock, flags);
-+ priv->status = 0;
-+ spin_unlock_irqrestore(&priv->lock, flags);
++ /* tx fifo overflow (8) */
++ if (i_err & I2C_ERR_IRQSS_TXF_OFL)
++ priv->msg_err |= FALCON_I2C_TX_OFL;
+
-+ /* wait for the bus to become ready */
-+ ret = falcon_i2c_ready(priv);
-+ if (ret)
-+ return ret;
++ /* tx fifo underflow (4) */
++ if (i_err & I2C_ERR_IRQSS_TXF_UFL)
++ priv->msg_err |= FALCON_I2C_TX_UFL;
+
-+ /* transfer message */
-+ ret = falcon_i2c_xfer_msg(priv, &msg[i]);
++ /* rx fifo overflow (2) */
++ if (i_err & I2C_ERR_IRQSS_RXF_OFL)
++ priv->msg_err |= FALCON_I2C_RX_OFL;
+
-+ if (ret)
-+ return ret;
++ /* rx fifo underflow (1) */
++ if (i_err & I2C_ERR_IRQSS_RXF_UFL)
++ priv->msg_err |= FALCON_I2C_RX_UFL;
+
-+ /* check for unhandled errors */
-+ spin_lock_irqsave(&priv->lock, flags);
-+ if (FALCON_I2C_ERROR(priv))
-+ ret = priv->status;
-+ spin_unlock_irqrestore(&priv->lock, flags);
++ i2c_w32(i_err, err_irqsc);
++ }
+
-+ if (ret) {
-+ dev_warn(priv->dev, "message %u unhandled error 0x%x\n",
-+ i, ret);
++ /* protocol interrupt */
++ if (i_raw & I2C_RIS_I2C_P_INT_INTOCC)
++ falcon_i2c_isr_prot(priv);
+
-+ return ret;
-+ }
-+ }
++ if ((priv->msg_err) || (priv->status == STATUS_STOP))
++ complete(&priv->cmd_complete);
+
-+ return 0;
++ return IRQ_HANDLED;
+}
+
-+static u32 falcon_i2c_func(struct i2c_adapter *adap)
++static u32 falcon_i2c_functionality(struct i2c_adapter *adap)
+{
-+ return I2C_FUNC_I2C | I2C_FUNC_10BIT_ADDR | I2C_FUNC_SMBUS_EMUL;
++ 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_func,
++ .functionality = falcon_i2c_functionality,
+};
+
-+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);
-+
-+ /* set normal operation clock divider */
-+ i2c_w32(1 << I2C_CLC_RMC_OFFSET, clc);
-+
-+ /* 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_CFG_INC_OFFSET)
-+ | (152 << I2C_FDIV_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 */
-+ falcon_addr_configure(priv, priv->ten_bit);
-+
-+ /* enable bus */
-+ i2c_w32_mask(0, I2C_RUN_CTRL_RUN_EN, run_ctrl);
-+
-+ /* mask burst interrupts */
-+ i2c_w32_mask(I2C_IMSC_LBREQ_INT_EN | I2C_IMSC_BREQ_INT_EN, 0, imsc);
-+
-+ /* enable interrupts */
-+ i2c_w32(I2C_IMSC_LBREQ_INT_EN
-+ | I2C_IMSC_BREQ_INT_EN
-+ | I2C_IMSC_I2C_P_INT_EN
-+ | I2C_IMSC_I2C_ERR_INT_EN,
-+ imsc);
-+
-+ return 0;
-+}
-+
+static int __devinit falcon_i2c_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ strlcpy(adap->name, DRV_NAME "-adapter", sizeof(adap->name));
+ adap->algo = &falcon_i2c_algorithm;
+
-+ priv->ten_bit = 0;
+ priv->mode = FALCON_I2C_MODE_100;
+ priv->clk = clk;
+ priv->dev = &pdev->dev;
+
-+ spin_lock_init(&priv->lock);
++ init_completion(&priv->cmd_complete);
++ mutex_init(&priv->mutex);
++
++ ret = ltq_gpio_request(107, 0, 0, 0, DRV_NAME":sda");
++ if (ret) {
++ dev_err(&pdev->dev, "I2C gpio 107 (sda) not available\n");
++ ret = -ENXIO;
++ goto err_free_priv;
++ }
++ ret = ltq_gpio_request(108, 0, 0, 0, DRV_NAME":scl");
++ if (ret) {
++ gpio_free(107);
++ dev_err(&pdev->dev, "I2C gpio 108 (scl) 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_priv;
++ goto err_free_gpio;
+ }
+
+ /* map memory */
+ }
+
+ priv->irq_lb = irqres_lb->start;
-+ ret = request_irq(priv->irq_lb, falcon_i2c_isr, IRQF_DISABLED,
++ 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);
+ }
+
+ priv->irq_b = irqres_b->start;
-+ ret = request_irq(priv->irq_b, falcon_i2c_isr, IRQF_DISABLED,
++ 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);
+ (i2c_r32(id) & I2C_ID_ID_MASK) >> I2C_ID_ID_OFFSET,
+ (i2c_r32(id) & I2C_ID_REV_MASK) >> I2C_ID_REV_OFFSET);
+
-+ init_completion(&priv->done);
-+
+ /* initialize HW */
+ ret = falcon_i2c_hw_init(adap);
+ if (ret) {
+ goto err_remove_adapter;
+ }
+
++ dev_info(&pdev->dev, "version %s\n", DRV_VERSION);
++
+ return 0;
+
+err_remove_adapter:
+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);
+
+ 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);
+ ret = platform_driver_register(&falcon_i2c_driver);
+
+ if (ret)
-+ printk(KERN_DEBUG DRV_NAME ": can't register platform driver");
++ pr_debug(DRV_NAME ": can't register platform driver\n");
+
+ return ret;
+}
+module_exit(falcon_i2c_exit);
+
+MODULE_DESCRIPTION("Lantiq FALC(tm) ON - I2C bus adapter");
-+MODULE_ALIAS("platform:i2c_falcon");
++MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_LICENSE("GPL");
++MODULE_VERSION(DRV_VERSION);
projects / oweals / openwrt.git / blobdiff