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/*
* Atheros AR71xx built-in ethernet mac driver
*
* Copyright (C) 2008 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
struct ag71xx_mdio *ag71xx_mdio_bus;
static inline void ag71xx_mdio_wr(struct ag71xx_mdio *am, unsigned reg,
u32 value)
{
__raw_writel(value, am->mdio_base + reg - AG71XX_REG_MII_CFG);
}
static inline u32 ag71xx_mdio_rr(struct ag71xx_mdio *am, unsigned reg)
{
return __raw_readl(am->mdio_base + reg - AG71XX_REG_MII_CFG);
}
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_mii_read(struct ag71xx_mdio *am, int addr, int reg)
{
int ret;
int i;
ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_WRITE);
ag71xx_mdio_wr(am, AG71XX_REG_MII_ADDR,
((addr & 0xff) << MII_ADDR_S) | (reg & 0xff));
ag71xx_mdio_wr(am, AG71XX_REG_MII_CMD, MII_CMD_READ);
i = AG71XX_MDIO_RETRY;
while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
if (i-- == 0) {
printk(KERN_ERR "%s: mii_read timed out\n",
am->mii_bus.name);
ret = 0xffff;
goto out;
}
udelay(AG71XX_MDIO_DELAY);
}
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);
out:
return ret;
}
static void ag71xx_mdio_mii_write(struct ag71xx_mdio *am,
int addr, int reg, u16 val)
{
int i;
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_S) | (reg & 0xff));
ag71xx_mdio_wr(am, AG71XX_REG_MII_CTRL, val);
i = AG71XX_MDIO_RETRY;
while (ag71xx_mdio_rr(am, AG71XX_REG_MII_IND) & MII_IND_BUSY) {
if (i-- == 0) {
printk(KERN_ERR "%s: mii_write timed out\n",
am->mii_bus.name);
break;
}
udelay(AG71XX_MDIO_DELAY);
}
}
static int ag71xx_mdio_reset(struct mii_bus *bus)
{
struct ag71xx_mdio *am = bus->priv;
ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_RESET);
udelay(100);
ag71xx_mdio_wr(am, AG71XX_REG_MII_CFG, MII_CFG_CLK_DIV_28);
udelay(100);
return 0;
}
static int ag71xx_mdio_read(struct mii_bus *bus, int addr, int reg)
{
struct ag71xx_mdio *am = bus->priv;
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;
ag71xx_mdio_mii_write(am, addr, reg, val);
return 0;
}
static int __init ag71xx_mdio_probe(struct platform_device *pdev)
{
struct ag71xx_mdio_platform_data *pdata;
struct ag71xx_mdio *am;
struct resource *res;
int i;
int err;
if (ag71xx_mdio_bus)
return -EBUSY;
am = kzalloc(sizeof(*am), GFP_KERNEL);
if (!am) {
err = -ENOMEM;
goto err_out;
}
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.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;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
am->mii_bus.id = 0;
#else
snprintf(am->mii_bus.id, MII_BUS_ID_SIZE, "%x", 0);
#endif
am->mii_bus.priv = am;
am->mii_bus.dev = &pdev->dev;
pdata = pdev->dev.platform_data;
if (pdata)
am->mii_bus.phy_mask = pdata->phy_mask;
for (i = 0; i < PHY_MAX_ADDR; i++)
am->mii_irq[i] = PHY_POLL;
err = mdiobus_register(&am->mii_bus);
if (err)
goto err_iounmap;
ag71xx_mdio_dump_regs(am);
platform_set_drvdata(pdev, am);
ag71xx_mdio_bus = am;
return 0;
err_iounmap:
iounmap(am->mdio_base);
err_free_mdio:
kfree(am);
err_out:
return err;
}
static int __exit ag71xx_mdio_remove(struct platform_device *pdev)
{
struct ag71xx_mdio *am = platform_get_drvdata(pdev);
if (am) {
ag71xx_mdio_bus = NULL;
mdiobus_unregister(&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 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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