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kernel: b53: add support for GPIO reset

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This is needed for some switches used on bcm47xx SoCs like the one on the Asus RT-N66U.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 37645
This commit is contained in:
Hauke Mehrtens 2013-08-01 19:05:34 +00:00
parent 2363cb3893
commit e1127aca07
2 changed files with 43 additions and 0 deletions
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29
target/linux/generic/files/drivers/net/phy/b53/b53_common.c
View file

@ -20,6 +20,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/gpio.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/switch.h> #include <linux/switch.h>
@ -451,10 +452,30 @@ static int b53_apply(struct b53_device *dev)
return 0; return 0;
} }
void b53_switch_reset_gpio(struct b53_device *dev)
{
int gpio = dev->reset_gpio;
if (gpio < 0)
return;
gpio_set_value(gpio, 0);
gpio_direction_output(gpio, 1);
gpio_set_value(gpio, 0);
mdelay(50);
gpio_set_value(gpio, 1);
mdelay(20);
dev->current_page = 0xff;
}
static int b53_switch_reset(struct b53_device *dev) static int b53_switch_reset(struct b53_device *dev)
{ {
u8 mgmt; u8 mgmt;
b53_switch_reset_gpio(dev);
b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, &mgmt); b53_read8(dev, B53_CTRL_PAGE, B53_SWITCH_MODE, &mgmt);
if (!(mgmt & SM_SW_FWD_EN)) { if (!(mgmt & SM_SW_FWD_EN)) {
@ -1114,6 +1135,7 @@ int b53_switch_init(struct b53_device *dev)
{ {
struct switch_dev *sw_dev = &dev->sw_dev; struct switch_dev *sw_dev = &dev->sw_dev;
unsigned i; unsigned i;
int ret;
for (i = 0; i < ARRAY_SIZE(b53_switch_chips); i++) { for (i = 0; i < ARRAY_SIZE(b53_switch_chips); i++) {
const struct b53_chip_data *chip = &b53_switch_chips[i]; const struct b53_chip_data *chip = &b53_switch_chips[i];
@ -1192,6 +1214,13 @@ int b53_switch_init(struct b53_device *dev)
if (!dev->buf) if (!dev->buf)
return -ENOMEM; return -ENOMEM;
dev->reset_gpio = b53_switch_get_reset_gpio(dev);
if (dev->reset_gpio >= 0) {
ret = devm_gpio_request(dev->dev, dev->reset_gpio, "robo_reset");
if (ret)
return ret;
}
return b53_switch_reset(dev); return b53_switch_reset(dev);
} }

14
target/linux/generic/files/drivers/net/phy/b53/b53_priv.h
View file

@ -75,6 +75,7 @@ struct b53_device {
u8 duplex_reg; u8 duplex_reg;
u8 jumbo_pm_reg; u8 jumbo_pm_reg;
u8 jumbo_size_reg; u8 jumbo_size_reg;
int reset_gpio;
/* used ports mask */ /* used ports mask */
u16 enabled_ports; u16 enabled_ports;
@ -275,4 +276,17 @@ static inline int b53_write64(struct b53_device *dev, u8 page, u8 reg,
return ret; return ret;
} }
#ifdef CONFIG_BCM47XX
#include <bcm47xx_nvram.h>
static inline int b53_switch_get_reset_gpio(struct b53_device *dev)
{
return bcm47xx_nvram_gpio_pin("robo_reset");
}
#else
static inline int b53_switch_get_reset_gpio(struct b53_device *dev)
{
return -ENOENT;
}
#endif
#endif #endif