TLK10232_phy.c

#include "tn40.h"
#include "TLK10232_phy.h"
int bdx_speed_set(struct bdx_priv *priv, u32 speed);
void sff_reset(struct bdx_priv *priv);
int sff_read_str(struct bdx_priv *priv, unsigned char sfp_adr,
		 unsigned char addr, int len, char *buf);
int sff_write_str(struct bdx_priv *priv, unsigned char sfp_adr,
		  unsigned char addr, int len, char *buf);
int i2c_write_byte(struct bdx_priv *priv, int send_start, int send_stop,
		   unsigned char byte);
unsigned char i2c_read_byte(struct bdx_priv *priv, int nack, int send_stop);
int i2c_read_bit(struct bdx_priv *priv);
int i2c_write_bit(struct bdx_priv *priv, int bit);
int i2c_start_cond(struct bdx_priv *priv, int I2C_started);
int i2c_stop_cond(struct bdx_priv *priv);
int i2c_SCL_stretch(struct bdx_priv *priv);
int read_sfp_id(struct bdx_priv *priv);
void set_GPIO(struct bdx_priv *priv);
void clear_GPIO_N(struct bdx_priv *priv, u32 n);
u32 read_GPIO_N(struct bdx_priv *priv, u32 n);
int TLK10232_phy_config(struct bdx_priv *priv);
int TLK10232_mdio_reset(struct bdx_priv *priv, int port, unsigned short phy);
u32 TLK10232_get_link_speed(struct bdx_priv *priv);
u32 TLK10232_link_changed(struct bdx_priv *priv);
void TLK10232_leds(struct bdx_priv *priv, enum PHY_LEDS_OP op);

#define LINK_LOOP_MAX   (80)

void TLK10232_register_settings(struct bdx_priv *priv);

enum _SFP_MOD_TYPE {
	SFP_ABS = 0,
	SFP_NA,
	SFP_1G,
	SFP_10G,
	SFP_10G_DA
};

#define TEST_SFP_OM

#ifdef TEST_SFP_OM

#define SCL_GPIO 4
#define SDA_GPIO 5
#define TX_DISABLE_GPIO 1
#define MOD_ABS_GPIO 2

#define I2C_delay(priv)  udelay(8)
#define RWDELAY(priv)  udelay(1)

#define WRITE_GPOI_REG(priv,reg,val) do{\
 WRITE_REG(priv, 0x51E0,0x30010000|((reg&0xf)));\
READ_REG(priv, 0x5030); WRITE_REG(priv, 0x51F0, ( val) );\
} while(0)

#define READ_GPOI_REG(priv,reg,val) do{\
 WRITE_REG(priv, 0x51E0,0x30000000|((reg&0xf)));\
 READ_REG(priv, 0x5030); val=READ_REG(priv, 0x51F0);\
} while(0)

#define	LOG_I2C	pr_debug

u32 read_GPIO_N(struct bdx_priv *priv, u32 n)
{
	u32 ret, rw, i, msk = (1 << (n & 0x7));
	/* get current GPIO state */
	READ_GPOI_REG(priv, 6, rw);
	/* set to input GPIO N */
	WRITE_GPOI_REG(priv, 6, rw | msk);
	RWDELAY(priv);
	/* read */
	READ_GPOI_REG(priv, 4, i);
	ret = (i & msk) ? 1 : 0;
	LOG_I2C("read_GPIO_N(%x) 4= %x 6=(%x | %x) ret=%x) \n", n, i, rw, msk,
		ret);

	return ret;

}

void clear_GPIO_N(struct bdx_priv *priv, u32 n)
{
	u32 rw, msk = ~(1 << (n & 0x7));
	/* get current GPIO state */
	READ_GPOI_REG(priv, 6, rw);
	/* set to output GPIO N */
	WRITE_GPOI_REG(priv, 6, (rw & msk));
	RWDELAY(priv);
	LOG_I2C("clear_GPIO_N(%x)  6=(%x & %x)\n", n, rw, msk);

}

/* Set SCL as input and return current level of line, 0 or 1 */
#define read_SCL(p) read_GPIO_N((p),SCL_GPIO)
/* Set SDA as input and return current level of line, 0 or 1 */
#define read_SDA(p)  read_GPIO_N((p),SDA_GPIO)
/* Actively drive SCL signal low */
#define  clear_SCL(p) clear_GPIO_N((p),SCL_GPIO)
/* Actively drive SDA signal low */
#define  clear_SDA(p) clear_GPIO_N((p),SDA_GPIO)

/*return 0-ok 1-CLK==0 */

int i2c_SCL_stretch(struct bdx_priv *priv)
{
	int i;
	for (i = 50; i; i--) {
		if (read_SCL(priv))
			break;
		udelay(1);
	}

	return (i) ? 0 : 1;

}

int i2c_start_cond(struct bdx_priv *priv, int I2C_started)
{
	int ret = 0;
	LOG_I2C("TLK10232 i2c_start_cond start=====================\n");
	I2C_delay(priv);
	I2C_delay(priv);
	if (I2C_started) {
		read_SDA(priv);
		I2C_delay(priv);
		ret = i2c_SCL_stretch(priv);
		if (ret) {
			LOG_I2C("TLK10232 i2c_start_cond failed SCL==0\n");
		}
		I2C_delay(priv);
	}

	if (read_SDA(priv) == 0) {
		LOG_I2C("TLK10232 i2c_start_cond failed SDA==0\n");
		ret = 1;
	}
	/* SCL is high, set SDA from 1 to 0. */
	clear_SDA(priv);
	I2C_delay(priv);
	clear_SCL(priv);
	LOG_I2C("TLK10232 i2c_start_cond " "%s======================\n",
		ret ? "Failed " : "OK");

	return ret;

}

int i2c_stop_cond(struct bdx_priv *priv)
{
	int ret = 0;
	LOG_I2C("TLK10232 i2c_stop_cond start===================\n");
	clear_SCL(priv);
	/* set SDA to 0 */
	clear_SDA(priv);
	I2C_delay(priv);
	/* Clock stretching */
	ret = i2c_SCL_stretch(priv);
	if (ret) {
		LOG_I2C("TLK10232 i2c_stop_cond failed SCL==0\n");
		ret = 1;
	}
	/* Stop bit setup time, minimum 4us */
	I2C_delay(priv);
	/* SCL is high, set SDA from 0 to 1 */
	if (read_SDA(priv) == 0) {
		LOG_I2C("TLK10232 i2c_stop_cond failed SDA==0\n");
		ret = 1;
	}
	I2C_delay(priv);
	LOG_I2C("TLK10232 i2c_stop_cond end===================\n");

	return ret;

}

/* Write a bit to I2C bus */
int i2c_write_bit(struct bdx_priv *priv, int bit)
{
	int ret = 0;
	LOG_I2C("TLK10232 i2c_write_bit ==%x start \n", bit);
	if (bit) {
		read_SDA(priv);
	} else {
		clear_SDA(priv);
	}
	i2c_SCL_stretch(priv);
	I2C_delay(priv);
	/* SCL is high, now data is valid */
	/* If SDA is high, check that nobody else is driving SDA */
	if (bit)
		if (read_SDA(priv) == 0) {

			ret = 1;
		}
	I2C_delay(priv);
	clear_SCL(priv);
	LOG_I2C("TLK10232 i2c_write_bit %s\n", ret ? "failed" : "OK");

	return ret;

}

/* Read a bit from I2C bus */
int i2c_read_bit(struct bdx_priv *priv)
{
	int bit;
	LOG_I2C("TLK10232 i2c_read_bit start \n");
	/* Let the slave drive data */
	read_SDA(priv);
	i2c_SCL_stretch(priv);
	I2C_delay(priv);
	/* SCL is high, now data is valid */
	bit = read_SDA(priv);
	I2C_delay(priv);
	clear_SCL(priv);
	LOG_I2C("TLK10232 i2c_read_bit %x \n", bit);

	return bit ? 1 : 0;

}

/* Write a byte to I2C bus. Return 0 if ack by the slave. */
int i2c_write_byte(struct bdx_priv *priv, int send_start,
		   int send_stop, unsigned char byte)
{
	unsigned bit;
	int nack;
	LOG_I2C("i2c_write_byte 0x%x start\n", byte);
	if (send_start) {
		i2c_start_cond(priv, (send_start == 2) ? 1 : 0);
	}
	for (bit = 0; bit < 8; bit++) {
		i2c_write_bit(priv, (byte & 0x80) != 0);
		byte <<= 1;
	}
	nack = i2c_read_bit(priv);
	if (send_stop) {
		i2c_stop_cond(priv);
	}
	LOG_I2C("i2c_write_byte end nack=%x\n", nack);

	return nack;

}

/* Read a byte from I2C bus */
unsigned char i2c_read_byte(struct bdx_priv *priv, int nack, int send_stop)
{
	unsigned char byte = 0;
	unsigned bit;
	LOG_I2C("i2c_read_byte start nack=%x\n", nack);
	for (bit = 0; bit < 8; bit++) {
		byte = (byte << 1);
		byte |= i2c_read_bit(priv);
	}
	i2c_write_bit(priv, nack);
	if (send_stop) {
		i2c_stop_cond(priv);
	}
	LOG_I2C("i2c_read_byte stop byte=%x\n", byte);

	return byte;

}

void sff_reset(struct bdx_priv *priv)
{
	int i;

	for (i = 0; i < 9; i++) {
		i2c_read_bit(priv);
	}
	i2c_start_cond(priv, 0);
	I2C_delay(priv);
	read_SDA(priv);

}

/*
Return len or 0 on error
*/
int sff_read_str(struct bdx_priv *priv, unsigned char sfp_adr,
		 unsigned char addr, int len, char *buf)
{
	unsigned char data;
	int i = 0, err = 0;

	if (buf == 0)
		return 0;
	if (len == 0)
		return 0;
	if (len & 0xff00)
		return 0;

	pr_debug("TLK10232 sff_read_str sfp_adr=%x addr=%x start \n", sfp_adr,
		 addr);

	do {
		err = i2c_write_byte(priv, /*send_start */ 1, /*send_stop */ 0,
				     sfp_adr & 0xfe);
		if (err) {
			err = 1;
			break;
		}

		err = i2c_write_byte(priv, /*send_start */ 0, /*send_stop */ 1,
				     addr & 0xff);
		if (err) {
			err = 2;
			break;
		}

		err = i2c_write_byte(priv, /*send_start */ 1, /*send_stop */ 0,
				     sfp_adr | 1);
		if (err) {
			err = 3;
			break;
		}

		len--;
		for (i = 0; i < len; i++) {
			data =
			    i2c_read_byte(priv, /*nack */ 0, /*send_stop */ 0);
			buf[i] = data;
		}
		data = i2c_read_byte(priv, /*nack */ 1, /*send_stop */ 1);
		buf[i] = data;
		i++;
		pr_debug("TLK10232 sff_read_str sfp_adr=%x addr=%x end \n",
			 sfp_adr, addr);
	} while (0);
	if (err) {
		pr_debug("TLK10232 sff_read step %u failed\n", err);
		i = 0;
		i2c_stop_cond(priv);
	}

	return i;

}

int sff_write_str(struct bdx_priv *priv, unsigned char sfp_adr,
		  unsigned char addr, int len, char *buf)
{
	int i = 0, err = 0;

	if (buf == 0)
		return 0;
	if (len == 0)
		return 0;
	if (len > 8)
		return 0;	/* not more then 7 bytes by SFF spec */
	if (len & 0xff00)
		return 0;

	pr_debug("TLK10232 sff_write_str sfp_adr=%x addr=%x start \n", sfp_adr,
		 addr);

	do {
		err = i2c_write_byte(priv, /*send_start */ 1, /*send_stop */ 0,
				     sfp_adr & 0xfe);
		if (err) {
			err = 1;
			break;
		}

		err = i2c_write_byte(priv, /*send_start */ 0, /*send_stop */ 0,
				     addr & 0xff);
		if (err) {
			err = 2;
			break;
		}

		len--;
		for (i = 0; i < len; i++) {
			err = i2c_write_byte(priv, /*send_start */ 0,
					     /*send_stop */ 0, buf[i]);
			if (err) {
				err = 4;
				break;
			}
		}
		if (err) {
			err = 4;
			break;
		}
		err = i2c_write_byte(priv, /*send_start */ 0, /*send_stop */ 1,
				     buf[i]);
		i++;
		pr_debug("TLK10232 sff_write_str sfp_adr=%x addr=%x end \n",
			 sfp_adr, addr);
	} while (0);
	if (err) {
		pr_err("TLK10232 sff_write step %u failed\n", err);
		i = 0;
		i2c_stop_cond(priv);
	}

	return i;

}

void set_GPIO(struct bdx_priv *priv)
{
	u32 input_msk =
	    (1 << 11) | (1 << SCL_GPIO) | (1 << SDA_GPIO) | (1 << MOD_ABS_GPIO);
	WRITE_GPOI_REG(priv, 4, 0);
	WRITE_GPOI_REG(priv, 6, input_msk);

}

int read_sfp_id(struct bdx_priv *priv)
{
	char buff[10];
	int i, ret;
	int sff_addr = 0xa0;
	int addr = 0x3;
	int len = 6;

	set_GPIO(priv);
	i = read_GPIO_N(priv, MOD_ABS_GPIO);
	pr_debug("MOD_ABS_GPIO=%u  \n", i);
	if (i)
		return SFP_ABS;
	ret = sff_read_str(priv, sff_addr, addr, len, buff);
	pr_debug("sff_read_str(0x%x,0x%x,0x%x)=%x  \n", sff_addr, addr, len,
		 ret);
#if 0
	for (i = 0; i < ret; i++) {
		pr_err("sff_read_str buf[%u]=0x%x \n", i, buff[i] & 0xff);
	}
#endif
	if (buff[5] & 0xF)
		return SFP_10G_DA;
	if (buff[0])
		return SFP_10G;
	if (buff[3] & 0xF)
		return SFP_1G;

	return SFP_10G;

}

#else
#define read_sfp_id(p) (SFP_10G)
#endif

int TLK10232_phy_config(struct bdx_priv *priv)
{
	int regVal, j = 0;
	int port = priv->phy_mdio_port;

	u32 sfp_mod_type = priv->sfp_mod_type;
	if (sfp_mod_type == SFP_ABS)
		return 0;

	switch (sfp_mod_type) {
	default:
	case SFP_10G:
		BDX_MDIO_WRITE(priv, 0x1e, CHANNEL_CONTROL_1, 0x0B00);
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_2, 0xA848);	/*reg 1e.3 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_3, 0x9518);	/*reg 1e.4 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_4, 0x3300);	/*reg 1e.5 */
		break;

	case SFP_10G_DA:
		BDX_MDIO_WRITE(priv, 0x1e, CHANNEL_CONTROL_1, 0x0B00);
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_2, 0xF848);	/*reg 1e.3 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_3, 0x1500);	/*reg 1e.4 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_4, 0x2000);	/*reg 1e.5 */
		break;

	case SFP_1G:
		BDX_MDIO_WRITE(priv, 0x1e, CHANNEL_CONTROL_1, 0x0300);
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_2, 0xA848);	/*reg 1e.3 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_3, 0x9518);	/*reg 1e.4 */
		BDX_MDIO_WRITE(priv, 0x1e, HS_SERDES_CONTROL_4, 0x3300);	/*reg 1e.5 */

		break;
	}

	/* Datapath reset */
	do {
		udelay(25);
		BDX_MDIO_WRITE(priv, 0x1e, RESET_CONTROL, 0x8);
		BDX_MDIO_WRITE(priv, 0x1e, RESET_CONTROL, 0x0);
		udelay(25);
		regVal = bdx_mdio_read(priv, 0x1e, port, CHANNEL_STATUS_1);
		regVal = bdx_mdio_read(priv, 0x1e, port, CHANNEL_STATUS_1);
		pr_debug
		    ("TLK10232_phy_config() CHANNEL_STATUS_1 = 0x%x Fail:%x loops:%d (Fail mask 0x0100)\n",
		     regVal, (regVal & 0x0100), j);
	} while ((regVal & 0x0100) && (j++ < 100));

	return 0;
}

int TLK10232_mdio_reset(struct bdx_priv *priv, int port, unsigned short phy)
{
	int regVal;
	priv->sfp_mod_type = 0;

	/* Device reset */
	BDX_MDIO_WRITE(priv, 0x1e, GLOBAL_CONTROL_1, 0x8610);
	regVal = bdx_mdio_read(priv, 0x1e, port, GLOBAL_CONTROL_1);
	pr_debug("TLK10232_mdio_reset() GLOBAL_CONTROL_1 = 0x%x\n", regVal);
	msleep(100);

	BDX_MDIO_WRITE(priv, 0x7, AN_CONTROL, 0x2000);
	BDX_MDIO_WRITE(priv, 0x1, LT_TRAIN_CONTROL, 0x0);

	priv->link_speed = TLK10232_get_link_speed(priv);
	bdx_speed_set(priv, priv->link_speed);

	return 0;

}

u32 TLK10232_get_link_speed(struct bdx_priv *priv)
{
	u32 sfp_mod_type, speed;

	sfp_mod_type = read_sfp_id(priv);

	if (priv->sfp_mod_type != sfp_mod_type) {
		priv->sfp_mod_type = sfp_mod_type;
		TLK10232_phy_config(priv);
	}
	switch (sfp_mod_type) {
	case SFP_10G:
	case SFP_10G_DA:
		speed = SPEED_10000;
		break;
	case SFP_1G:
		/*speed=SPEED_1000; break; */
	default:
		speed = 0;
		break;
	}

	return speed;

}

u32 TLK10232_link_changed(struct bdx_priv *priv)
{
	u32 link = 0;

	link = READ_REG(priv, regMAC_LNK_STAT) & MAC_LINK_STAT;
	if (link) {
		priv->link_speed = TLK10232_get_link_speed(priv);
		link = priv->link_speed;
		pr_debug("TLK10232 link speed is %s\n",
			 (priv->link_speed == SPEED_10000) ? "10G" : "1G");
		WRITE_REG(priv, 0x5150, 0);	/*  stop timer */
	} else {
		if (priv->link_loop_cnt++ > LINK_LOOP_MAX) {
			pr_debug
			    ("TLK10232 trying to recover link after %d tries\n",
			     LINK_LOOP_MAX);
			priv->link_speed = TLK10232_get_link_speed(priv);
			/* MAC reset */
			bdx_speed_set(priv, 0);
			bdx_speed_set(priv, priv->link_speed);
			priv->link_loop_cnt = 0;
			priv->sfp_mod_type = SFP_ABS;
		}

		WRITE_REG(priv, 0x5150, 1000000);	/* 1/5 sec timeout */
	}

	return link;

}

void TLK10232_leds(struct bdx_priv *priv, enum PHY_LEDS_OP op)
{
	switch (op) {
	case PHY_LEDS_SAVE:
		break;

	case PHY_LEDS_RESTORE:
		break;

	case PHY_LEDS_ON:
		WRITE_REG(priv, regBLNK_LED, 4);
		break;

	case PHY_LEDS_OFF:
		WRITE_REG(priv, regBLNK_LED, 0);
		break;

	default:
		pr_debug("TLK10232_leds() unknown op 0x%x\n", op);
		break;

	}

}

__init enum PHY_TYPE TLK10232_register(struct bdx_priv *priv)
{
	priv->isr_mask =
	    IR_RX_FREE_0 | IR_LNKCHG0 | IR_PSE | IR_TMR0 | IR_RX_DESC_0 |
	    IR_TX_FREE_0;
	priv->phy_ops.mdio_reset = TLK10232_mdio_reset;
	priv->phy_ops.link_changed = TLK10232_link_changed;
	priv->phy_ops.ledset = TLK10232_leds;
	priv->phy_ops.mdio_speed = MDIO_SPEED_1MHZ;
	TLK10232_register_settings(priv);

	return PHY_TYPE_TLK10232;

}