Release 4.7 drivers/i2c/busses/i2c-pnx.c

/*
 * 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 <linux/of.h>


#define I2C_PNX_TIMEOUT_DEFAULT		10 
/* msec */

#define I2C_PNX_SPEED_KHZ_DEFAULT	100

#define I2C_PNX_REGION_SIZE		0x100

enum {
	
mstatus_tdi = 0x00000001,
	
mstatus_afi = 0x00000002,
	
mstatus_nai = 0x00000004,
	
mstatus_drmi = 0x00000008,
	
mstatus_active = 0x00000020,
	
mstatus_scl = 0x00000040,
	
mstatus_sda = 0x00000080,
	
mstatus_rff = 0x00000100,
	
mstatus_rfe = 0x00000200,
	
mstatus_tff = 0x00000400,
	
mstatus_tfe = 0x00000800,
};

enum {
	
mcntrl_tdie = 0x00000001,
	
mcntrl_afie = 0x00000002,
	
mcntrl_naie = 0x00000004,
	
mcntrl_drmie = 0x00000008,
	
mcntrl_drsie = 0x00000010,
	
mcntrl_rffie = 0x00000020,
	
mcntrl_daie = 0x00000040,
	
mcntrl_tffie = 0x00000080,
	
mcntrl_reset = 0x00000100,
	
mcntrl_cdbmode = 0x00000400,
};

enum {
	
rw_bit = 1 << 0,
	
start_bit = 1 << 8,
	
stop_bit = 1 << 9,
};


#define I2C_REG_RX(a)	((a)->ioaddr)		
/* Rx FIFO reg (RO) */

#define I2C_REG_TX(a)	((a)->ioaddr)		
/* Tx FIFO reg (WO) */

#define I2C_REG_STS(a)	((a)->ioaddr + 0x04)	
/* Status reg (RO) */

#define I2C_REG_CTL(a)	((a)->ioaddr + 0x08)	
/* Ctl reg */

#define I2C_REG_CKL(a)	((a)->ioaddr + 0x0c)	
/* Clock divider low */

#define I2C_REG_CKH(a)	((a)->ioaddr + 0x10)	
/* Clock divider high */

#define I2C_REG_ADR(a)	((a)->ioaddr + 0x14)	
/* I2C address */

#define I2C_REG_RFL(a)	((a)->ioaddr + 0x18)	
/* Rx FIFO level (RO) */

#define I2C_REG_TFL(a)	((a)->ioaddr + 0x1c)	
/* Tx FIFO level (RO) */

#define I2C_REG_RXB(a)	((a)->ioaddr + 0x20)	
/* Num of bytes Rx-ed (RO) */

#define I2C_REG_TXB(a)	((a)->ioaddr + 0x24)	
/* Num of bytes Tx-ed (RO) */

#define I2C_REG_TXS(a)	((a)->ioaddr + 0x28)	
/* Tx slave FIFO (RO) */

#define I2C_REG_STFL(a)	((a)->ioaddr + 0x2c)	
/* Tx slave FIFO level (RO) */



static inline int wait_timeout(struct i2c_pnx_algo_data *data)
{
	long timeout = data->timeout;
	while (timeout > 0 &&
			(ioread32(I2C_REG_STS(data)) & mstatus_active)) {
		mdelay(1);
		timeout--;
	}
	return (timeout <= 0);
}

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static inline int wait_reset(struct i2c_pnx_algo_data *data)
{
	long timeout = data->timeout;
	while (timeout > 0 &&
			(ioread32(I2C_REG_CTL(data)) & mcntrl_reset)) {
		mdelay(1);
		timeout--;
	}
	return (timeout <= 0);
}

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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(alg_data->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);
}

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/**
 * 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(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;
}

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/**
 * 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)));
}

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/**
 * 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(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;
}

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/**
 * 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) {
		/* 'Asking' is done asynchronously, e.g. dummy TX of several
                 * bytes is done before the first actual RX arrives in FIFO.
                 * Therefore, ordered bytes (via TX) are counted separately.
                 */
		if (alg_data->mif.order) {
			dev_dbg(&alg_data->adapter.dev,
				"%s(): Write dummy data to fill Rx-fifo...\n",
				__func__);

			if (alg_data->mif.order == 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));
			alg_data->mif.order--;
		}
		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(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;
}

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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;
}

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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(alg_data);
	alg_data->mif.ret = -EIO;
	complete(&alg_data->mif.complete);
}

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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(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(alg_data);
	} else if (stat & mstatus_nai) {
		iowrite32(ioread32(I2C_REG_CTL(alg_data)) | mcntrl_reset,
			  I2C_REG_CTL(alg_data));
		wait_reset(alg_data);
	}
}

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/**
 * 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;

	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.order = 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;
	alg_data->mif.order = 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;
}

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vitaly wool
vitaly wool
452
88.98%
1
25.00%
russell king
russell king
34
6.69%
1
25.00%
roland stigge
roland stigge
18
3.54%
1
25.00%
harvey harrison
harvey harrison
4
0.79%
1
25.00%
Total
508
100.00%
4
100.00%



static u32 i2c_pnx_func(struct i2c_adapter *adapter)
{
	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}

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16
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1
100.00%


static struct i2c_algorithm pnx_algorithm = {
	.master_xfer = i2c_pnx_xfer,
	.functionality = i2c_pnx_func,
};

#ifdef CONFIG_PM_SLEEP


static int i2c_pnx_controller_suspend(struct device *dev)
{
	struct i2c_pnx_algo_data *alg_data = dev_get_drvdata(dev);

	clk_disable_unprepare(alg_data->clk);

	return 0;
}

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vitaly wool
vitaly wool
18
58.06%
1
20.00%
russell king
russell king
8
25.81%
2
40.00%
rafael j. wysocki
rafael j. wysocki
4
12.90%
1
20.00%
vladimir zapolskiy
vladimir zapolskiy
1
3.23%
1
20.00%
Total
31
100.00%
5
100.00%



static int i2c_pnx_controller_resume(struct device *dev)
{
	struct i2c_pnx_algo_data *alg_data = dev_get_drvdata(dev);

	return clk_prepare_enable(alg_data->clk);
}

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vitaly wool
vitaly wool
18
62.07%
1
16.67%
russell king
russell king
6
20.69%
3
50.00%
rafael j. wysocki
rafael j. wysocki
4
13.79%
1
16.67%
vladimir zapolskiy
vladimir zapolskiy
1
3.45%
1
16.67%
Total
29
100.00%
6
100.00%

static SIMPLE_DEV_PM_OPS(i2c_pnx_pm,
			 i2c_pnx_controller_suspend, i2c_pnx_controller_resume);

#define PNX_I2C_PM	(&i2c_pnx_pm)
#else

#define PNX_I2C_PM	NULL
#endif



static int i2c_pnx_probe(struct platform_device *pdev)
{
	unsigned long tmp;
	int ret = 0;
	struct i2c_pnx_algo_data *alg_data;
	unsigned long freq;
	struct resource *res;
	u32 speed = I2C_PNX_SPEED_KHZ_DEFAULT * 1000;

	alg_data = devm_kzalloc(&pdev->dev, sizeof(*alg_data), GFP_KERNEL);
	if (!alg_data)
		return -ENOMEM;

	platform_set_drvdata(pdev, alg_data);

	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->timeout = I2C_PNX_TIMEOUT_DEFAULT;
#ifdef CONFIG_OF
	alg_data->adapter.dev.of_node = of_node_get(pdev->dev.of_node);
	if (pdev->dev.of_node) {
		of_property_read_u32(pdev->dev.of_node, "clock-frequency",
				     &speed);
		/*
                 * At this point, it is planned to add an OF timeout property.
                 * As soon as there is a consensus about how to call and handle
                 * this, sth. like the following can be put here:
                 *
                 * of_property_read_u32(pdev->dev.of_node, "timeout",
                 *                      &alg_data->timeout);
                 */
	}
#endif
	alg_data->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(alg_data->clk))
		return PTR_ERR(alg_data->clk);

	setup_timer(&alg_data->mif.timer, i2c_pnx_timeout,
			(unsigned long)alg_data);

	snprintf(alg_data->adapter.name, sizeof(alg_data->adapter.name),
		 "%s", pdev->name);

	/* Register I/O resource */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	alg_data->ioaddr = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(alg_data->ioaddr))
		return PTR_ERR(alg_data->ioaddr);

	ret = clk_prepare_enable(alg_data->clk);
	if (ret)
		return ret;

	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 / speed) / 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(alg_data)) {
		ret = -ENODEV;
		goto out_clock;
	}
	init_completion(&alg_data->mif.complete);

	alg_data->irq = platform_get_irq(pdev, 0);
	if (alg_data->irq < 0) {
		dev_err(&pdev->dev, "Failed to get IRQ from platform resource\n");
		ret = alg_data->irq;
		goto out_clock;
	}
	ret = devm_request_irq(&pdev->dev, alg_data->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_clock;
	}

	dev_dbg(&pdev->dev, "%s: Master at %#8x, irq %d.\n",
		alg_data->adapter.name, res->start, alg_data->irq);

	return 0;

out_clock:
	clk_disable_unprepare(alg_data->clk);
	return ret;
}

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vitaly wool
vitaly wool
210
39.55%
1
6.67%
roland stigge
roland stigge
138
25.99%
2
13.33%
russell king
russell king
127
23.92%
6
40.00%
jingoo han
jingoo han
32
6.03%
1
6.67%
kevin wells
kevin wells
11
2.07%
2
13.33%
wei yongjun
wei yongjun
7
1.32%
1
6.67%
muhammad falak r wani
muhammad falak r wani
4
0.75%
1
6.67%
vladimir zapolskiy
vladimir zapolskiy
2
0.38%
1
6.67%
Total
531
100.00%
15
100.00%



static int i2c_pnx_remove(struct platform_device *pdev)
{
	struct i2c_pnx_algo_data *alg_data = platform_get_drvdata(pdev);

	i2c_del_adapter(&alg_data->adapter);
	clk_disable_unprepare(alg_data->clk);

	return 0;
}

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1
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russell king
9
23.08%
2
50.00%
vladimir zapolskiy
vladimir zapolskiy
1
2.56%
1
25.00%
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39
100.00%
4
100.00%

#ifdef CONFIG_OF

static const struct of_device_id i2c_pnx_of_match[] = {
	{ .compatible = "nxp,pnx-i2c" },
	{ },
};
MODULE_DEVICE_TABLE(of, i2c_pnx_of_match);
#endif


static struct platform_driver i2c_pnx_driver = {
	.driver = {
		.name = "pnx-i2c",
		.of_match_table = of_match_ptr(i2c_pnx_of_match),
		.pm = PNX_I2C_PM,
        },
	.probe = i2c_pnx_probe,
	.remove = i2c_pnx_remove,
};



static int __init i2c_adap_pnx_init(void)
{
	return platform_driver_register(&i2c_pnx_driver);
}

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static void __exit i2c_adap_pnx_exit(void)
{
	platform_driver_unregister(&i2c_pnx_driver);
}

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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);
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vitaly wool
vitaly wool
2520
73.15%
1
3.23%
roland stigge
roland stigge
447
12.98%
5
16.13%
russell king
russell king
328
9.52%
10
32.26%
kevin wells
kevin wells
43
1.25%
5
16.13%
jingoo han
jingoo han
33
0.96%
2
6.45%
rafael j. wysocki
rafael j. wysocki
28
0.81%
1
3.23%
harvey harrison
harvey harrison
21
0.61%
1
3.23%
wei yongjun
wei yongjun
7
0.20%
1
3.23%
kay sievers
kay sievers
5
0.15%
1
3.23%
vladimir zapolskiy
vladimir zapolskiy
5
0.15%
1
3.23%
muhammad falak r wani
muhammad falak r wani
4
0.12%
1
3.23%
sachin kamat
sachin kamat
3
0.09%
1
3.23%
tejun heo
tejun heo
1
0.03%
1
3.23%
Total
3445
100.00%
31
100.00%
  
Directory: drivers/i2c/busses

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