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/*
* Atheros AR71xx built-in ethernet mac driver
*
* Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* Based on Atheros' AG7100 driver
*
* 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 "ag71xx.h"
#define AG71XX_MDIO_RETRY 1000
#define AG71XX_MDIO_DELAY 5
static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
u32 value)
{
void __iomem *r;
r = am->mdio_base + reg;
__raw_writel(value, r);
/* flush write */
(void) __raw_readl(r);
}
static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
{
return __raw_readl(am->mdio_base + reg);
}
static void ag71xx_mdio_dump_regs(struct ag71xx_mdio *am)
{
DBG("%s: mii_cfg=%08x, mii_cmd=%08x, mii_addr=%08x\n",
am->mii_bus->name,
ag71xx_mdio_rr(am, AG71XX_REG_MII_CFG),
ag71xx_mdio_rr(am, AG71XX_REG_MII_CMD),
ag71xx_mdio_rr(am, AG71XX_REG_MII_ADDR));
DBG("%s: mii_ctrl=%08x, mii_status=%08x, mii_ind=%08x\n",
am->mii_bus->name,
ag71xx_mdio_rr(am, AG71XX_REG_MII_CTRL),
ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS),
ag71xx_mdio_rr(am, AG71XX_REG_MII_IND));
}
static int ag71xx_mdio_wait_busy(struct ag71xx_mdio *am)
{
int i;
for (i = 0; i < AG71XX_MDIO_RETRY; i++) {
u32 busy;
udelay(AG71XX_MDIO_DELAY);
busy = ag71xx_mdio_rr(am, AG71XX_REG_MII_IND);
if (!busy)
return 0;
udelay(AG71XX_MDIO_DELAY);
}
pr_err("%s: MDIO operation timed out\n", am->mii_bus->name);
return -ETIMEDOUT;
}
int ag71xx_mdio_mii_read(struct ag71xx_mdio *am, int addr, int reg)
{
int err;
int ret;
err = ag71xx_mdio_wait_busy(am);
if (err)
return 0xffff;
ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
err = ag71xx_mdio_wait_busy(am);
if (err)
return 0xffff;
ret = ag71xx_mdio_rr(am, AG71XX_REG_MII_STATUS) & 0xffff;
ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
DBG("mii_read: addr=%04x, reg=%04x, value=%04x\n", addr, reg, ret);
return ret;
}
void ag71xx_mdio_mii_write(struct ag71xx_mdio *am, int addr, int reg, u16 val)
{
DBG("mii_write: addr=%04x, reg=%04x, value=%04x\n", addr, reg, val);
ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
ag71xx_mdio_wait_busy(am);
}
static const u32 ar71xx_mdio_div_table[] = {
4, 4, 6, 8, 10, 14, 20, 28,
};
static const u32 ar7240_mdio_div_table[] = {
2, 2, 4, 6, 8, 12, 18, 26, 32, 40, 48, 56, 62, 70, 78, 96,
};
static const u32 ar933x_mdio_div_table[] = {
4, 4, 6, 8, 10, 14, 20, 28, 34, 42, 50, 58, 66, 74, 82, 98,
};
static int ag71xx_mdio_get_divider(struct ag71xx_mdio *am, u32 *div)
{
unsigned long ref_clock, mdio_clock;
const u32 *table;
int ndivs;
int i;
ref_clock = am->pdata->ref_clock;
mdio_clock = am->pdata->mdio_clock;
if (!ref_clock || !mdio_clock)
return -EINVAL;
if (am->pdata->is_ar9330 || am->pdata->is_ar934x) {
table = ar933x_mdio_div_table;
ndivs = ARRAY_SIZE(ar933x_mdio_div_table);
} else if (am->pdata->is_ar7240) {
table = ar7240_mdio_div_table;
ndivs = ARRAY_SIZE(ar7240_mdio_div_table);
} else {
table = ar71xx_mdio_div_table;
ndivs = ARRAY_SIZE(ar71xx_mdio_div_table);
}
for (i = 0; i < ndivs; i++) {
unsigned long t;
t = ref_clock / table[i];
if (t <= mdio_clock) {
*div = i;
return 0;
}
}
dev_err(&am->mii_bus->dev, "no divider found for %lu/%lu\n",
ref_clock, mdio_clock);
return -ENOENT;
}
static int ag71xx_mdio_reset(struct mii_bus *bus)
{
struct ag71xx_mdio *am = bus->priv;
u32 t;
int err;
err = ag71xx_mdio_get_divider(am, &t);
if (err) {
/* fallback */
if (am->pdata->is_ar7240)
t = MII_CFG_CLK_DIV_6;
else if (am->pdata->builtin_switch && !am->pdata->is_ar934x)
t = MII_CFG_CLK_DIV_10;
else if (!am->pdata->builtin_switch && am->pdata->is_ar934x)
t = MII_CFG_CLK_DIV_58;
else
t = MII_CFG_CLK_DIV_28;
}
ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t | MII_CFG_RESET);
udelay(100);
ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, t);
udelay(100);
return 0;
}
static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
{
struct ag71xx_mdio *am = bus->priv;
if (am->pdata->builtin_switch)
return ar7240sw_phy_read(bus, addr, reg);
else
return ag71xx_mdio_mii_read(am, addr, reg);
}
static int ag71xx_mdio_write(struct mii_bus *bus, int addr, int reg, u16 val)
{
struct ag71xx_mdio *am = bus->priv;
if (am->pdata->builtin_switch)
ar7240sw_phy_write(bus, addr, reg, val);
else
ag71xx_mdio_mii_write(am, addr, reg, val);
return 0;
}
static int __devinit ag71xx_mdio_probe(struct platform_device *pdev)
{
struct ag71xx_mdio_platform_data *pdata;
struct ag71xx_mdio *am;
struct resource *res;
int i;
int err;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data specified\n");
return -EINVAL;
}
am = kzalloc(sizeof(*am), GFP_KERNEL);
if (!am) {
err = -ENOMEM;
goto err_out;
}
am->pdata = pdata;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no iomem resource found\n");
err = -ENXIO;
goto err_out;
}
am->mdio_base = ioremap_nocache(res->start, res->end - res->start + 1);
if (!am->mdio_base) {
dev_err(&pdev->dev, "unable to ioremap registers\n");
err = -ENOMEM;
goto err_free_mdio;
}
am->mii_bus = mdiobus_alloc();
if (am->mii_bus == NULL) {
err = -ENOMEM;
goto err_iounmap;
}
am->mii_bus->name = "ag71xx_mdio";
am->mii_bus->read = ag71xx_mdio_read;
am->mii_bus->write = ag71xx_mdio_write;
am->mii_bus->reset = ag71xx_mdio_reset;
am->mii_bus->irq = am->mii_irq;
am->mii_bus->priv = am;
am->mii_bus->parent = &pdev->dev;
snprintf(am->mii_bus->id, MII_BUS_ID_SIZE, "%s", dev_name(&pdev->dev));
am->mii_bus->phy_mask = pdata->phy_mask;
for (i = 0; i < PHY_MAX_ADDR; i++)
am->mii_irq[i] = PHY_POLL;
ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);
err = mdiobus_register(am->mii_bus);
if (err)
goto err_free_bus;
ag71xx_mdio_dump_regs(am);
platform_set_drvdata(pdev, am);
return 0;
err_free_bus:
mdiobus_free(am->mii_bus);
err_iounmap:
iounmap(am->mdio_base);
err_free_mdio:
kfree(am);
err_out:
return err;
}
static int __devexit ag71xx_mdio_remove(struct platform_device *pdev)
{
struct ag71xx_mdio *am = platform_get_drvdata(pdev);
if (am) {
mdiobus_unregister(am->mii_bus);
mdiobus_free(am->mii_bus);
iounmap(am->mdio_base);
kfree(am);
platform_set_drvdata(pdev, NULL);
}
return 0;
}
static struct platform_driver ag71xx_mdio_driver = {
.probe = ag71xx_mdio_probe,
.remove = __exit_p(ag71xx_mdio_remove),
.driver = {
.name = "ag71xx-mdio",
}
};
int __init ag71xx_mdio_driver_init(void)
{
return platform_driver_register(&ag71xx_mdio_driver);
}
void ag71xx_mdio_driver_exit(void)
{
platform_driver_unregister(&ag71xx_mdio_driver);
}
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