zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-pnx.c b/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-pnx.c
new file mode 100644
index 0000000..eb8ad53
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/i2c/busses/i2c-pnx.c
@@ -0,0 +1,733 @@
+/*
+ * Provides I2C support for Philips PNX010x/PNX4008 boards.
+ *
+ * Authors: Dennis Kovalev <dkovalev@ru.mvista.com>
+ * Vitaly Wool <vwool@ru.mvista.com>
+ *
+ * 2004-2006 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/timer.h>
+#include <linux/completion.h>
+#include <linux/platform_device.h>
+#include <linux/i2c-pnx.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+#include <mach/hardware.h>
+#include <mach/i2c.h>
+
+#define I2C_PNX_TIMEOUT 10 /* msec */
+#define I2C_PNX_SPEED_KHZ 100
+#define I2C_PNX_REGION_SIZE 0x100
+
+static inline int wait_timeout(long timeout, struct i2c_pnx_algo_data *data)
+{
+ while (timeout > 0 &&
+ (ioread32(I2C_REG_STS(data)) & mstatus_active)) {
+ mdelay(1);
+ timeout--;
+ }
+ return (timeout <= 0);
+}
+
+static inline int wait_reset(long timeout, struct i2c_pnx_algo_data *data)
+{
+ while (timeout > 0 &&
+ (ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) {
+ mdelay(1);
+ timeout--;
+ }
+ return (timeout <= 0);
+}
+
+static inline void i2c_pnx_arm_timer(struct i2c_pnx_algo_data *alg_data)
+{
+ struct timer_list *timer = &alg_data->mif.timer;
+ unsigned long expires = msecs_to_jiffies(I2C_PNX_TIMEOUT);
+
+ if (expires <= 1)
+ expires = 2;
+
+ del_timer_sync(timer);
+
+ dev_dbg(&alg_data->adapter.dev, "Timer armed at %lu plus %lu jiffies.\n",
+ jiffies, expires);
+
+ timer->expires = jiffies + expires;
+ timer->data = (unsigned long)alg_data;
+
+ add_timer(timer);
+}
+
+/**
+ * i2c_pnx_start - start a device
+ * @slave_addr: slave address
+ * @adap: pointer to adapter structure
+ *
+ * Generate a START signal in the desired mode.
+ */
+static int i2c_pnx_start(unsigned char slave_addr,
+ struct i2c_pnx_algo_data *alg_data)
+{
+ dev_dbg(&alg_data->adapter.dev, "%s(): addr 0x%x mode %d\n", __func__,
+ slave_addr, alg_data->mif.mode);
+
+ /* Check for 7 bit slave addresses only */
+ if (slave_addr & ~0x7f) {
+ dev_err(&alg_data->adapter.dev,
+ "%s: Invalid slave address %x. Only 7-bit addresses are supported\n",
+ alg_data->adapter.name, slave_addr);
+ return -EINVAL;
+ }
+
+ /* First, make sure bus is idle */
+ if (wait_timeout(I2C_PNX_TIMEOUT, alg_data)) {
+ /* Somebody else is monopolizing the bus */
+ dev_err(&alg_data->adapter.dev,
+ "%s: Bus busy. Slave addr = %02x, cntrl = %x, stat = %x\n",
+ alg_data->adapter.name, slave_addr,
+ ioread32(I2C_REG_CTL(alg_data)),
+ ioread32(I2C_REG_STS(alg_data)));
+ return -EBUSY;
+ } else if (ioread32(I2C_REG_STS(alg_data)) & mstatus_afi) {
+ /* Sorry, we lost the bus */
+ dev_err(&alg_data->adapter.dev,
+ "%s: Arbitration failure. Slave addr = %02x\n",
+ alg_data->adapter.name, slave_addr);
+ return -EIO;
+ }
+
+ /*
+ * OK, I2C is enabled and we have the bus.
+ * Clear the current TDI and AFI status flags.
+ */
+ iowrite32(ioread32(I2C_REG_STS(alg_data)) | mstatus_tdi | mstatus_afi,
+ I2C_REG_STS(alg_data));
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): sending %#x\n", __func__,
+ (slave_addr << 1) | start_bit | alg_data->mif.mode);
+
+ /* Write the slave address, START bit and R/W bit */
+ iowrite32((slave_addr << 1) | start_bit | alg_data->mif.mode,
+ I2C_REG_TX(alg_data));
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): exit\n", __func__);
+
+ return 0;
+}
+
+/**
+ * i2c_pnx_stop - stop a device
+ * @adap: pointer to I2C adapter structure
+ *
+ * Generate a STOP signal to terminate the master transaction.
+ */
+static void i2c_pnx_stop(struct i2c_pnx_algo_data *alg_data)
+{
+ /* Only 1 msec max timeout due to interrupt context */
+ long timeout = 1000;
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ /* Write a STOP bit to TX FIFO */
+ iowrite32(0xff | stop_bit, I2C_REG_TX(alg_data));
+
+ /* Wait until the STOP is seen. */
+ while (timeout > 0 &&
+ (ioread32(I2C_REG_STS(alg_data)) & mstatus_active)) {
+ /* may be called from interrupt context */
+ udelay(1);
+ timeout--;
+ }
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+}
+
+/**
+ * i2c_pnx_master_xmit - transmit data to slave
+ * @adap: pointer to I2C adapter structure
+ *
+ * Sends one byte of data to the slave
+ */
+static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
+{
+ u32 val;
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ if (alg_data->mif.len > 0) {
+ /* We still have something to talk about... */
+ val = *alg_data->mif.buf++;
+
+ if (alg_data->mif.len == 1)
+ val |= stop_bit;
+
+ alg_data->mif.len--;
+ iowrite32(val, I2C_REG_TX(alg_data));
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): xmit %#x [%d]\n",
+ __func__, val, alg_data->mif.len + 1);
+
+ if (alg_data->mif.len == 0) {
+ if (alg_data->last) {
+ /* Wait until the STOP is seen. */
+ if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
+ dev_err(&alg_data->adapter.dev,
+ "The bus is still active after timeout\n");
+ }
+ /* Disable master interrupts */
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) &
+ ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie),
+ I2C_REG_CTL(alg_data));
+
+ del_timer_sync(&alg_data->mif.timer);
+
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): Waking up xfer routine.\n",
+ __func__);
+
+ complete(&alg_data->mif.complete);
+ }
+ } else if (alg_data->mif.len == 0) {
+ /* zero-sized transfer */
+ i2c_pnx_stop(alg_data);
+
+ /* Disable master interrupts. */
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) &
+ ~(mcntrl_afie | mcntrl_naie | mcntrl_drmie),
+ I2C_REG_CTL(alg_data));
+
+ /* Stop timer. */
+ del_timer_sync(&alg_data->mif.timer);
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): Waking up xfer routine after zero-xfer.\n",
+ __func__);
+
+ complete(&alg_data->mif.complete);
+ }
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ return 0;
+}
+
+/**
+ * i2c_pnx_master_rcv - receive data from slave
+ * @adap: pointer to I2C adapter structure
+ *
+ * Reads one byte data from the slave
+ */
+static int i2c_pnx_master_rcv(struct i2c_pnx_algo_data *alg_data)
+{
+ unsigned int val = 0;
+ u32 ctl = 0;
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): entering: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ /* Check, whether there is already data,
+ * or we didn't 'ask' for it yet.
+ */
+ if (ioread32(I2C_REG_STS(alg_data)) & mstatus_rfe) {
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): Write dummy data to fill Rx-fifo...\n",
+ __func__);
+
+ if (alg_data->mif.len == 1) {
+ /* Last byte, do not acknowledge next rcv. */
+ val |= stop_bit;
+
+ /*
+ * Enable interrupt RFDAIE (data in Rx fifo),
+ * and disable DRMIE (need data for Tx)
+ */
+ ctl = ioread32(I2C_REG_CTL(alg_data));
+ ctl |= mcntrl_rffie | mcntrl_daie;
+ ctl &= ~mcntrl_drmie;
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+ }
+
+ /*
+ * Now we'll 'ask' for data:
+ * For each byte we want to receive, we must
+ * write a (dummy) byte to the Tx-FIFO.
+ */
+ iowrite32(val, I2C_REG_TX(alg_data));
+
+ return 0;
+ }
+
+ /* Handle data. */
+ if (alg_data->mif.len > 0) {
+ val = ioread32(I2C_REG_RX(alg_data));
+ *alg_data->mif.buf++ = (u8) (val & 0xff);
+ dev_dbg(&alg_data->adapter.dev, "%s(): rcv 0x%x [%d]\n",
+ __func__, val, alg_data->mif.len);
+
+ alg_data->mif.len--;
+ if (alg_data->mif.len == 0) {
+ if (alg_data->last)
+ /* Wait until the STOP is seen. */
+ if (wait_timeout(I2C_PNX_TIMEOUT, alg_data))
+ dev_err(&alg_data->adapter.dev,
+ "The bus is still active after timeout\n");
+
+ /* Disable master interrupts */
+ ctl = ioread32(I2C_REG_CTL(alg_data));
+ ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
+ mcntrl_drmie | mcntrl_daie);
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+
+ /* Kill timer. */
+ del_timer_sync(&alg_data->mif.timer);
+ complete(&alg_data->mif.complete);
+ }
+ }
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): exiting: stat = %04x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ return 0;
+}
+
+static irqreturn_t i2c_pnx_interrupt(int irq, void *dev_id)
+{
+ struct i2c_pnx_algo_data *alg_data = dev_id;
+ u32 stat, ctl;
+
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): mstat = %x mctrl = %x, mode = %d\n",
+ __func__,
+ ioread32(I2C_REG_STS(alg_data)),
+ ioread32(I2C_REG_CTL(alg_data)),
+ alg_data->mif.mode);
+ stat = ioread32(I2C_REG_STS(alg_data));
+
+ /* let's see what kind of event this is */
+ if (stat & mstatus_afi) {
+ /* We lost arbitration in the midst of a transfer */
+ alg_data->mif.ret = -EIO;
+
+ /* Disable master interrupts. */
+ ctl = ioread32(I2C_REG_CTL(alg_data));
+ ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
+ mcntrl_drmie);
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+
+ /* Stop timer, to prevent timeout. */
+ del_timer_sync(&alg_data->mif.timer);
+ complete(&alg_data->mif.complete);
+ } else if (stat & mstatus_nai) {
+ /* Slave did not acknowledge, generate a STOP */
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): Slave did not acknowledge, generating a STOP.\n",
+ __func__);
+ i2c_pnx_stop(alg_data);
+
+ /* Disable master interrupts. */
+ ctl = ioread32(I2C_REG_CTL(alg_data));
+ ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie |
+ mcntrl_drmie);
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+
+ /* Our return value. */
+ alg_data->mif.ret = -EIO;
+
+ /* Stop timer, to prevent timeout. */
+ del_timer_sync(&alg_data->mif.timer);
+ complete(&alg_data->mif.complete);
+ } else {
+ /*
+ * Two options:
+ * - Master Tx needs data.
+ * - There is data in the Rx-fifo
+ * The latter is only the case if we have requested for data,
+ * via a dummy write. (See 'i2c_pnx_master_rcv'.)
+ * We therefore check, as a sanity check, whether that interrupt
+ * has been enabled.
+ */
+ if ((stat & mstatus_drmi) || !(stat & mstatus_rfe)) {
+ if (alg_data->mif.mode == I2C_SMBUS_WRITE) {
+ i2c_pnx_master_xmit(alg_data);
+ } else if (alg_data->mif.mode == I2C_SMBUS_READ) {
+ i2c_pnx_master_rcv(alg_data);
+ }
+ }
+ }
+
+ /* Clear TDI and AFI bits */
+ stat = ioread32(I2C_REG_STS(alg_data));
+ iowrite32(stat | mstatus_tdi | mstatus_afi, I2C_REG_STS(alg_data));
+
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): exiting, stat = %x ctrl = %x.\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)),
+ ioread32(I2C_REG_CTL(alg_data)));
+
+ return IRQ_HANDLED;
+}
+
+static void i2c_pnx_timeout(unsigned long data)
+{
+ struct i2c_pnx_algo_data *alg_data = (struct i2c_pnx_algo_data *)data;
+ u32 ctl;
+
+ dev_err(&alg_data->adapter.dev,
+ "Master timed out. stat = %04x, cntrl = %04x. Resetting master...\n",
+ ioread32(I2C_REG_STS(alg_data)),
+ ioread32(I2C_REG_CTL(alg_data)));
+
+ /* Reset master and disable interrupts */
+ ctl = ioread32(I2C_REG_CTL(alg_data));
+ ctl &= ~(mcntrl_afie | mcntrl_naie | mcntrl_rffie | mcntrl_drmie);
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+
+ ctl |= mcntrl_reset;
+ iowrite32(ctl, I2C_REG_CTL(alg_data));
+ wait_reset(I2C_PNX_TIMEOUT, alg_data);
+ alg_data->mif.ret = -EIO;
+ complete(&alg_data->mif.complete);
+}
+
+static inline void bus_reset_if_active(struct i2c_pnx_algo_data *alg_data)
+{
+ u32 stat;
+
+ if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_active) {
+ dev_err(&alg_data->adapter.dev,
+ "%s: Bus is still active after xfer. Reset it...\n",
+ alg_data->adapter.name);
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
+ I2C_REG_CTL(alg_data));
+ wait_reset(I2C_PNX_TIMEOUT, alg_data);
+ } else if (!(stat & mstatus_rfe) || !(stat & mstatus_tfe)) {
+ /* If there is data in the fifo's after transfer,
+ * flush fifo's by reset.
+ */
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
+ I2C_REG_CTL(alg_data));
+ wait_reset(I2C_PNX_TIMEOUT, alg_data);
+ } else if (stat & mstatus_nai) {
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
+ I2C_REG_CTL(alg_data));
+ wait_reset(I2C_PNX_TIMEOUT, alg_data);
+ }
+}
+
+/**
+ * i2c_pnx_xfer - generic transfer entry point
+ * @adap: pointer to I2C adapter structure
+ * @msgs: array of messages
+ * @num: number of messages
+ *
+ * Initiates the transfer
+ */
+static int
+i2c_pnx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+ struct i2c_msg *pmsg;
+ int rc = 0, completed = 0, i;
+ struct i2c_pnx_algo_data *alg_data = adap->algo_data;
+ u32 stat = ioread32(I2C_REG_STS(alg_data));
+
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): entering: %d messages, stat = %04x.\n",
+ __func__, num, ioread32(I2C_REG_STS(alg_data)));
+
+ bus_reset_if_active(alg_data);
+
+ /* Process transactions in a loop. */
+ for (i = 0; rc >= 0 && i < num; i++) {
+ u8 addr;
+
+ pmsg = &msgs[i];
+ addr = pmsg->addr;
+
+ if (pmsg->flags & I2C_M_TEN) {
+ dev_err(&alg_data->adapter.dev,
+ "%s: 10 bits addr not supported!\n",
+ alg_data->adapter.name);
+ rc = -EINVAL;
+ break;
+ }
+
+ alg_data->mif.buf = pmsg->buf;
+ alg_data->mif.len = pmsg->len;
+ alg_data->mif.mode = (pmsg->flags & I2C_M_RD) ?
+ I2C_SMBUS_READ : I2C_SMBUS_WRITE;
+ alg_data->mif.ret = 0;
+ alg_data->last = (i == num - 1);
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): mode %d, %d bytes\n",
+ __func__, alg_data->mif.mode, alg_data->mif.len);
+
+ i2c_pnx_arm_timer(alg_data);
+
+ /* initialize the completion var */
+ init_completion(&alg_data->mif.complete);
+
+ /* Enable master interrupt */
+ iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_afie |
+ mcntrl_naie | mcntrl_drmie,
+ I2C_REG_CTL(alg_data));
+
+ /* Put start-code and slave-address on the bus. */
+ rc = i2c_pnx_start(addr, alg_data);
+ if (rc < 0)
+ break;
+
+ /* Wait for completion */
+ wait_for_completion(&alg_data->mif.complete);
+
+ if (!(rc = alg_data->mif.ret))
+ completed++;
+ dev_dbg(&alg_data->adapter.dev,
+ "%s(): Complete, return code = %d.\n",
+ __func__, rc);
+
+ /* Clear TDI and AFI bits in case they are set. */
+ if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_tdi) {
+ dev_dbg(&alg_data->adapter.dev,
+ "%s: TDI still set... clearing now.\n",
+ alg_data->adapter.name);
+ iowrite32(stat, I2C_REG_STS(alg_data));
+ }
+ if ((stat = ioread32(I2C_REG_STS(alg_data))) & mstatus_afi) {
+ dev_dbg(&alg_data->adapter.dev,
+ "%s: AFI still set... clearing now.\n",
+ alg_data->adapter.name);
+ iowrite32(stat, I2C_REG_STS(alg_data));
+ }
+ }
+
+ bus_reset_if_active(alg_data);
+
+ /* Cleanup to be sure... */
+ alg_data->mif.buf = NULL;
+ alg_data->mif.len = 0;
+
+ dev_dbg(&alg_data->adapter.dev, "%s(): exiting, stat = %x\n",
+ __func__, ioread32(I2C_REG_STS(alg_data)));
+
+ if (completed != num)
+ return ((rc < 0) ? rc : -EREMOTEIO);
+
+ return num;
+}
+
+static u32 i2c_pnx_func(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static struct i2c_algorithm pnx_algorithm = {
+ .master_xfer = i2c_pnx_xfer,
+ .functionality = i2c_pnx_func,
+};
+
+#ifdef CONFIG_PM
+static int i2c_pnx_controller_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);
+
+ clk_disable(alg_data->clk);
+
+ return 0;
+}
+
+static int i2c_pnx_controller_resume(struct platform_device *pdev)
+{
+ struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);
+
+ return clk_enable(alg_data->clk);
+}
+#else
+#define i2c_pnx_controller_suspend NULL
+#define i2c_pnx_controller_resume NULL
+#endif
+
+static int __devinit i2c_pnx_probe(struct platform_device *pdev)
+{
+ unsigned long tmp;
+ int ret = 0;
+ struct i2c_pnx_algo_data *alg_data;
+ unsigned long freq;
+ struct i2c_pnx_data *i2c_pnx = pdev->dev.platform_data;
+
+ if (!i2c_pnx || !i2c_pnx->name) {
+ dev_err(&pdev->dev, "%s: no platform data supplied\n",
+ __func__);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ alg_data = kzalloc(sizeof(*alg_data), GFP_KERNEL);
+ if (!alg_data) {
+ ret = -ENOMEM;
+ goto err_kzalloc;
+ }
+
+ platform_set_drvdata(pdev, alg_data);
+
+ strlcpy(alg_data->adapter.name, i2c_pnx->name,
+ sizeof(alg_data->adapter.name));
+ alg_data->adapter.dev.parent = &pdev->dev;
+ alg_data->adapter.algo = &pnx_algorithm;
+ alg_data->adapter.algo_data = alg_data;
+ alg_data->adapter.nr = pdev->id;
+ alg_data->i2c_pnx = i2c_pnx;
+
+ alg_data->clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(alg_data->clk)) {
+ ret = PTR_ERR(alg_data->clk);
+ goto out_drvdata;
+ }
+
+ init_timer(&alg_data->mif.timer);
+ alg_data->mif.timer.function = i2c_pnx_timeout;
+ alg_data->mif.timer.data = (unsigned long)alg_data;
+
+ /* Register I/O resource */
+ if (!request_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE,
+ pdev->name)) {
+ dev_err(&pdev->dev,
+ "I/O region 0x%08x for I2C already in use.\n",
+ i2c_pnx->base);
+ ret = -ENODEV;
+ goto out_clkget;
+ }
+
+ alg_data->ioaddr = ioremap(i2c_pnx->base, I2C_PNX_REGION_SIZE);
+ if (!alg_data->ioaddr) {
+ dev_err(&pdev->dev, "Couldn't ioremap I2C I/O region\n");
+ ret = -ENOMEM;
+ goto out_release;
+ }
+
+ ret = clk_enable(alg_data->clk);
+ if (ret)
+ goto out_unmap;
+
+ freq = clk_get_rate(alg_data->clk);
+
+ /*
+ * Clock Divisor High This value is the number of system clocks
+ * the serial clock (SCL) will be high.
+ * For example, if the system clock period is 50 ns and the maximum
+ * desired serial period is 10000 ns (100 kHz), then CLKHI would be
+ * set to 0.5*(f_sys/f_i2c)-2=0.5*(20e6/100e3)-2=98. The actual value
+ * programmed into CLKHI will vary from this slightly due to
+ * variations in the output pad's rise and fall times as well as
+ * the deglitching filter length.
+ */
+
+ tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
+ if (tmp > 0x3FF)
+ tmp = 0x3FF;
+ iowrite32(tmp, I2C_REG_CKH(alg_data));
+ iowrite32(tmp, I2C_REG_CKL(alg_data));
+
+ iowrite32(mcntrl_reset, I2C_REG_CTL(alg_data));
+ if (wait_reset(I2C_PNX_TIMEOUT, alg_data)) {
+ ret = -ENODEV;
+ goto out_clock;
+ }
+ init_completion(&alg_data->mif.complete);
+
+ ret = request_irq(i2c_pnx->irq, i2c_pnx_interrupt,
+ 0, pdev->name, alg_data);
+ if (ret)
+ goto out_clock;
+
+ /* Register this adapter with the I2C subsystem */
+ ret = i2c_add_numbered_adapter(&alg_data->adapter);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "I2C: Failed to add bus\n");
+ goto out_irq;
+ }
+
+ dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
+ alg_data->adapter.name, i2c_pnx->base, i2c_pnx->irq);
+
+ return 0;
+
+out_irq:
+ free_irq(i2c_pnx->irq, alg_data);
+out_clock:
+ clk_disable(alg_data->clk);
+out_unmap:
+ iounmap(alg_data->ioaddr);
+out_release:
+ release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE);
+out_clkget:
+ clk_put(alg_data->clk);
+out_drvdata:
+ kfree(alg_data);
+err_kzalloc:
+ platform_set_drvdata(pdev, NULL);
+out:
+ return ret;
+}
+
+static int __devexit i2c_pnx_remove(struct platform_device *pdev)
+{
+ struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);
+ struct i2c_pnx_data *i2c_pnx = alg_data->i2c_pnx;
+
+ free_irq(i2c_pnx->irq, alg_data);
+ i2c_del_adapter(&alg_data->adapter);
+ clk_disable(alg_data->clk);
+ iounmap(alg_data->ioaddr);
+ release_mem_region(i2c_pnx->base, I2C_PNX_REGION_SIZE);
+ clk_put(alg_data->clk);
+ kfree(alg_data);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver i2c_pnx_driver = {
+ .driver = {
+ .name = "pnx-i2c",
+ .owner = THIS_MODULE,
+ },
+ .probe = i2c_pnx_probe,
+ .remove = __devexit_p(i2c_pnx_remove),
+ .suspend = i2c_pnx_controller_suspend,
+ .resume = i2c_pnx_controller_resume,
+};
+
+static int __init i2c_adap_pnx_init(void)
+{
+ return platform_driver_register(&i2c_pnx_driver);
+}
+
+static void __exit i2c_adap_pnx_exit(void)
+{
+ platform_driver_unregister(&i2c_pnx_driver);
+}
+
+MODULE_AUTHOR("Vitaly Wool, Dennis Kovalev <source@mvista.com>");
+MODULE_DESCRIPTION("I2C driver for Philips IP3204-based I2C busses");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pnx-i2c");
+
+/* We need to make sure I2C is initialized before USB */
+subsys_initcall(i2c_adap_pnx_init);
+module_exit(i2c_adap_pnx_exit);