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/*
* Realtek RTL8366 SMI interface driver
*
* Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include "rtl8366_smi.h"
#define RTL8366_SMI_ACK_RETRY_COUNT 5
#define RTL8366_SMI_CLK_DELAY 10 /* nsec */
static inline void rtl8366_smi_clk_delay(struct rtl8366_smi *smi)
{
ndelay(RTL8366_SMI_CLK_DELAY);
}
static void rtl8366_smi_start(struct rtl8366_smi *smi)
{
unsigned int sda = smi->gpio_sda;
unsigned int sck = smi->gpio_sck;
/*
* Set GPIO pins to output mode, with initial state:
* SCK = 0, SDA = 1
*/
gpio_direction_output(sck, 0);
gpio_direction_output(sda, 1);
rtl8366_smi_clk_delay(smi);
/* CLK 1: 0 -> 1, 1 -> 0 */
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 0);
rtl8366_smi_clk_delay(smi);
/* CLK 2: */
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sda, 0);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 0);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sda, 1);
}
static void rtl8366_smi_stop(struct rtl8366_smi *smi)
{
unsigned int sda = smi->gpio_sda;
unsigned int sck = smi->gpio_sck;
rtl8366_smi_clk_delay(smi);
gpio_set_value(sda, 0);
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sda, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 0);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 1);
/* add a click */
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 0);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 1);
/* set GPIO pins to input mode */
gpio_direction_input(sda);
gpio_direction_input(sck);
}
static void rtl8366_smi_write_bits(struct rtl8366_smi *smi, u32 data, u32 len)
{
unsigned int sda = smi->gpio_sda;
unsigned int sck = smi->gpio_sck;
for (; len > 0; len--) {
rtl8366_smi_clk_delay(smi);
/* prepare data */
gpio_set_value(sda, !!(data & ( 1 << (len - 1))));
rtl8366_smi_clk_delay(smi);
/* clocking */
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
gpio_set_value(sck, 0);
}
}
static void rtl8366_smi_read_bits(struct rtl8366_smi *smi, u32 len, u32 *data)
{
unsigned int sda = smi->gpio_sda;
unsigned int sck = smi->gpio_sck;
gpio_direction_input(sda);
for (*data = 0; len > 0; len--) {
u32 u;
rtl8366_smi_clk_delay(smi);
/* clocking */
gpio_set_value(sck, 1);
rtl8366_smi_clk_delay(smi);
u = !!gpio_get_value(sda);
gpio_set_value(sck, 0);
*data |= (u << (len - 1));
}
gpio_direction_output(sda, 0);
}
static int rtl8366_smi_wait_for_ack(struct rtl8366_smi *smi)
{
int retry_cnt;
retry_cnt = 0;
do {
u32 ack;
rtl8366_smi_read_bits(smi, 1, &ack);
if (ack == 0)
break;
if (++retry_cnt > RTL8366_SMI_ACK_RETRY_COUNT)
return -EIO;
} while (1);
return 0;
}
static int rtl8366_smi_write_byte(struct rtl8366_smi *smi, u8 data)
{
rtl8366_smi_write_bits(smi, data, 8);
return rtl8366_smi_wait_for_ack(smi);
}
static int rtl8366_smi_read_byte0(struct rtl8366_smi *smi, u8 *data)
{
u32 t;
/* read data */
rtl8366_smi_read_bits(smi, 8, &t);
*data = (t & 0xff);
/* send an ACK */
rtl8366_smi_write_bits(smi, 0x00, 1);
return 0;
}
static int rtl8366_smi_read_byte1(struct rtl8366_smi *smi, u8 *data)
{
u32 t;
/* read data */
rtl8366_smi_read_bits(smi, 8, &t);
*data = (t & 0xff);
/* send an ACK */
rtl8366_smi_write_bits(smi, 0x01, 1);
return 0;
}
int rtl8366_smi_read_reg(struct rtl8366_smi *smi, u32 addr, u32 *data)
{
unsigned long flags;
u8 lo = 0;
u8 hi = 0;
int ret;
spin_lock_irqsave(&smi->lock, flags);
rtl8366_smi_start(smi);
/* send READ command */
ret = rtl8366_smi_write_byte(smi, 0x0a << 4 | 0x04 << 1 | 0x01);
if (ret)
goto out;
/* set ADDR[7:0] */
ret = rtl8366_smi_write_byte(smi, addr & 0xff);
if (ret)
goto out;
/* set ADDR[15:8] */
ret = rtl8366_smi_write_byte(smi, addr >> 8);
if (ret)
goto out;
/* read DATA[7:0] */
rtl8366_smi_read_byte0(smi, &lo);
/* read DATA[15:8] */
rtl8366_smi_read_byte1(smi, &hi);
*data = ((u32) lo) | (((u32) hi) << 8);
ret = 0;
out:
rtl8366_smi_stop(smi);
spin_unlock_irqrestore(&smi->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(rtl8366_smi_read_reg);
int rtl8366_smi_write_reg(struct rtl8366_smi *smi, u32 addr, u32 data)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&smi->lock, flags);
rtl8366_smi_start(smi);
/* send WRITE command */
ret = rtl8366_smi_write_byte(smi, 0x0a << 4 | 0x04 << 1 | 0x00);
if (ret)
goto out;
/* set ADDR[7:0] */
ret = rtl8366_smi_write_byte(smi, addr & 0xff);
if (ret)
goto out;
/* set ADDR[15:8] */
ret = rtl8366_smi_write_byte(smi, addr >> 8);
if (ret)
goto out;
/* write DATA[7:0] */
ret = rtl8366_smi_write_byte(smi, data & 0xff);
if (ret)
goto out;
/* write DATA[15:8] */
ret = rtl8366_smi_write_byte(smi, data >> 8);
if (ret)
goto out;
ret = 0;
out:
rtl8366_smi_stop(smi);
spin_unlock_irqrestore(&smi->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(rtl8366_smi_write_reg);
int rtl8366_smi_rmwr(struct rtl8366_smi *smi, u32 addr, u32 mask, u32 data)
{
u32 t;
int err;
err = rtl8366_smi_read_reg(smi, addr, &t);
if (err)
return err;
err = rtl8366_smi_write_reg(smi, addr, (t & ~mask) | data);
return err;
}
EXPORT_SYMBOL_GPL(rtl8366_smi_rmwr);
static int rtl8366_smi_mii_init(struct rtl8366_smi *smi)
{
int ret;
int i;
smi->mii_bus = mdiobus_alloc();
if (smi->mii_bus == NULL) {
ret = -ENOMEM;
goto err;
}
smi->mii_bus->priv = (void *) smi;
smi->mii_bus->name = dev_name(smi->parent);
smi->mii_bus->read = smi->ops->mii_read;
smi->mii_bus->write = smi->ops->mii_write;
snprintf(smi->mii_bus->id, MII_BUS_ID_SIZE, "%s",
dev_name(smi->parent));
smi->mii_bus->parent = smi->parent;
smi->mii_bus->phy_mask = ~(0x1f);
smi->mii_bus->irq = smi->mii_irq;
for (i = 0; i < PHY_MAX_ADDR; i++)
smi->mii_irq[i] = PHY_POLL;
ret = mdiobus_register(smi->mii_bus);
if (ret)
goto err_free;
return 0;
err_free:
mdiobus_free(smi->mii_bus);
err:
return ret;
}
static void rtl8366_smi_mii_cleanup(struct rtl8366_smi *smi)
{
mdiobus_unregister(smi->mii_bus);
mdiobus_free(smi->mii_bus);
}
int rtl8366_smi_init(struct rtl8366_smi *smi)
{
int err;
if (!smi->parent)
return -EINVAL;
if (!smi->ops)
return -EINVAL;
err = gpio_request(smi->gpio_sda, dev_name(smi->parent));
if (err) {
dev_err(smi->parent, "gpio_request failed for %u, err=%d\n",
smi->gpio_sda, err);
goto err_out;
}
err = gpio_request(smi->gpio_sck, dev_name(smi->parent));
if (err) {
dev_err(smi->parent, "gpio_request failed for %u, err=%d\n",
smi->gpio_sck, err);
goto err_free_sda;
}
spin_lock_init(&smi->lock);
dev_info(smi->parent, "using GPIO pins %u (SDA) and %u (SCK)\n",
smi->gpio_sda, smi->gpio_sck);
err = smi->ops->detect(smi);
if (err) {
dev_err(smi->parent, "chip detection failed, err=%d\n", err);
goto err_free_sck;
}
err = rtl8366_smi_mii_init(smi);
if (err)
goto err_free_sck;
return 0;
err_free_sck:
gpio_free(smi->gpio_sck);
err_free_sda:
gpio_free(smi->gpio_sda);
err_out:
return err;
}
EXPORT_SYMBOL_GPL(rtl8366_smi_init);
void rtl8366_smi_cleanup(struct rtl8366_smi *smi)
{
rtl8366_smi_mii_cleanup(smi);
gpio_free(smi->gpio_sck);
gpio_free(smi->gpio_sda);
}
EXPORT_SYMBOL_GPL(rtl8366_smi_cleanup);
MODULE_DESCRIPTION("Realtek RTL8366 SMI interface driver");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_LICENSE("GPL v2");
|
