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Add support for resetting the PHY via GPIO.

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Submitted by:		Emmanuel Vadot <manu@bidouilliste.com>
Reviewed by:		andrew, jmcneill
Approved by:		adrian (mentor)
Differential Revision:	https://reviews.freebsd.org/D5505
This commit is contained in:
Jared McNeill 2016-03-03 22:26:36 +00:00
parent 7bf46e12dd
commit d7acb49aee
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=296365
1 changed files with 64 additions and 0 deletions
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64
sys/dev/dwc/if_dwc.c
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@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/gpio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
@ -70,6 +71,7 @@ __FBSDID("$FreeBSD$");
#include <dev/ofw/ofw_bus_subr.h>
#include "if_dwc_if.h"
#include "gpio_if.h"
#include "miibus_if.h"
#define READ4(_sc, _reg) \
@ -1010,6 +1012,62 @@ dwc_get_hwaddr(struct dwc_softc *sc, uint8_t *hwaddr)
return (0);
}
#define GPIO_ACTIVE_LOW 1
static int
dwc_reset(device_t dev)
{
pcell_t gpio_prop[4];
pcell_t delay_prop[3];
phandle_t node, gpio_node;
device_t gpio;
uint32_t pin, flags;
uint32_t pin_value;
node = ofw_bus_get_node(dev);
if (OF_getencprop(node, "snps,reset-gpio",
gpio_prop, sizeof(gpio_prop)) <= 0)
return (0);
if (OF_getencprop(node, "snps,reset-delays-us",
delay_prop, sizeof(delay_prop)) <= 0) {
device_printf(dev,
"Wrong property for snps,reset-delays-us");
return (ENXIO);
}
gpio_node = OF_node_from_xref(gpio_prop[0]);
if ((gpio = OF_device_from_xref(gpio_prop[0])) == NULL) {
device_printf(dev,
"Can't find gpio controller for phy reset\n");
return (ENXIO);
}
if (GPIO_MAP_GPIOS(gpio, node, gpio_node,
sizeof(gpio_prop) / sizeof(gpio_prop[0]) - 1,
gpio_prop + 1, &pin, &flags) != 0) {
device_printf(dev, "Can't map gpio for phy reset\n");
return (ENXIO);
}
pin_value = GPIO_PIN_LOW;
if (OF_hasprop(node, "snps,reset-active-low"))
pin_value = GPIO_PIN_HIGH;
if (flags & GPIO_ACTIVE_LOW)
pin_value = !pin_value;
GPIO_PIN_SETFLAGS(gpio, pin, GPIO_PIN_OUTPUT);
GPIO_PIN_SET(gpio, pin, pin_value);
DELAY(delay_prop[0]);
GPIO_PIN_SET(gpio, pin, !pin_value);
DELAY(delay_prop[1]);
GPIO_PIN_SET(gpio, pin, pin_value);
DELAY(delay_prop[2]);
return (0);
}
static int
dwc_probe(device_t dev)
{
@ -1058,6 +1116,12 @@ dwc_attach(device_t dev)
return (ENXIO);
}
/* Reset the PHY if needed */
if (dwc_reset(dev) != 0) {
device_printf(dev, "Can't reset the PHY\n");
return (ENXIO);
}
/* Reset */
reg = READ4(sc, BUS_MODE);
reg |= (BUS_MODE_SWR);