make mdio-gpio work with non OpenFirmware gpio implementation.
Aditional changes to mdio-gpio:
- use gpio_request() and gpio_free()
- place irq[] array in struct mdio_gpio_info
- add module description, author and license
- add note about compiling this driver as module
- rename mdc and mdio function (were ugly names)
- change MII to MDIO in bus name
- add __init __exit to module (un)loading functions
- probe fails if no phys added to the bus
- kzalloc bitbang with sizeof(*bitbang)
Changes since v3:
- keep bus naming "%x" to be compatible with existing drivers.
Changes since v2:
- more #ifdefs reduction
- platform driver will be registered on OF platforms also
- unified platform and OF bus_id to phy%i
Changes since v1:
- removed NO_IRQ
- reduced #idefs
Laurent, please test this driver under OF.
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Mike Frysinger <vapier.adi@xxxxxxxxx>
---
drivers/net/phy/Kconfig | 5 +
drivers/net/phy/mdio-gpio.c | 232 ++++++++++++++++++++++++++++++-------------
include/linux/mdio-gpio.h | 25 +++++
3 files changed, 191 insertions(+), 71 deletions(-)
create mode 100644 include/linux/mdio-gpio.h
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 0318077..c4c5a2f 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -86,8 +86,11 @@ config MDIO_BITBANG
config MDIO_GPIO
tristate "Support for GPIO lib-based bitbanged MDIO buses"
- depends on MDIO_BITBANG && OF_GPIO
+ depends on MDIO_BITBANG && GENERIC_GPIO
---help---
Supports GPIO lib-based MDIO busses.
+ To compile this driver as a module, choose M here: the module
+ will be called mdio-gpio.
+
endif # PHYLIB
diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
index 2ff9775..a439ebe 100644
--- a/drivers/net/phy/mdio-gpio.c
+++ b/drivers/net/phy/mdio-gpio.c
@@ -1,9 +1,12 @@
/*
- * OpenFirmware GPIO based MDIO bitbang driver.
+ * GPIO based MDIO bitbang driver.
+ * Supports OpenFirmware.
*
* Copyright (c) 2008 CSE Semaphore Belgium.
* by Laurent Pinchart <laurentp@xxxxxxxxxxxxxxxxx>
*
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
+ *
* Based on earlier work by
*
* Copyright (c) 2003 Intracom S.A.
@@ -21,9 +24,14 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
-#include <linux/mdio-bitbang.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/mdio-gpio.h>
+
+#ifdef CONFIG_OF_GPIO
#include <linux/of_gpio.h>
#include <linux/of_platform.h>
+#endif
struct mdio_gpio_info {
struct mdiobb_ctrl ctrl;
@@ -41,7 +49,7 @@ static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
gpio_direction_input(bitbang->mdio);
}
-static int mdio_read(struct mdiobb_ctrl *ctrl)
+static int mdio_get(struct mdiobb_ctrl *ctrl)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
@@ -49,7 +57,7 @@ static int mdio_read(struct mdiobb_ctrl *ctrl)
return gpio_get_value(bitbang->mdio);
}
-static void mdio(struct mdiobb_ctrl *ctrl, int what)
+static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
@@ -57,7 +65,7 @@ static void mdio(struct mdiobb_ctrl *ctrl, int what)
gpio_set_value(bitbang->mdio, what);
}
-static void mdc(struct mdiobb_ctrl *ctrl, int what)
+static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
@@ -67,93 +75,69 @@ static void mdc(struct mdiobb_ctrl *ctrl, int what)
static struct mdiobb_ops mdio_gpio_ops = {
.owner = THIS_MODULE,
- .set_mdc = mdc,
+ .set_mdc = mdc_set,
.set_mdio_dir = mdio_dir,
- .set_mdio_data = mdio,
- .get_mdio_data = mdio_read,
+ .set_mdio_data = mdio_set,
+ .get_mdio_data = mdio_get,
};
-static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
- struct device_node *np)
-{
- struct mdio_gpio_info *bitbang = bus->priv;
-
- bitbang->mdc = of_get_gpio(np, 0);
- bitbang->mdio = of_get_gpio(np, 1);
-
- if (bitbang->mdc < 0 || bitbang->mdio < 0)
- return -ENODEV;
-
- snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc);
- return 0;
-}
-
-static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
+static int __devinit mdio_gpio_bus_init(struct device *dev,
+ struct mdio_gpio_platform_data *pdata,
+ int bus_id)
{
- const u32 *data;
- int len, id, irq;
-
- data = of_get_property(np, "reg", &len);
- if (!data || len != 4)
- return;
-
- id = *data;
- bus->phy_mask &= ~(1 << id);
-
- irq = of_irq_to_resource(np, 0, NULL);
- if (irq != NO_IRQ)
- bus->irq[id] = irq;
-}
-
-static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
- const struct of_device_id *match)
-{
- struct device_node *np = NULL;
struct mii_bus *new_bus;
struct mdio_gpio_info *bitbang;
int ret = -ENOMEM;
int i;
- bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
+ bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
if (!bitbang)
goto out;
bitbang->ctrl.ops = &mdio_gpio_ops;
+ bitbang->mdc = pdata->mdc;
+ bitbang->mdio = pdata->mdio;
new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
if (!new_bus)
goto out_free_bitbang;
- new_bus->name = "GPIO Bitbanged MII",
+ new_bus->name = "GPIO Bitbanged MDIO",
- ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node);
- if (ret)
- goto out_free_bus;
+ ret = -ENODEV;
- new_bus->phy_mask = ~0;
- new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
- if (!new_bus->irq)
+ new_bus->phy_mask = pdata->phy_mask;
+ new_bus->irq = pdata->irqs;
+ new_bus->parent = dev;
+
+ if (new_bus->phy_mask == ~0)
goto out_free_bus;
for (i = 0; i < PHY_MAX_ADDR; i++)
- new_bus->irq[i] = -1;
+ if (!new_bus->irq[i])
+ new_bus->irq[i] = PHY_POLL;
- while ((np = of_get_next_child(ofdev->node, np)))
- if (!strcmp(np->type, "ethernet-phy"))
- add_phy(new_bus, np);
+ snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", bus_id);
+
+ if (gpio_request(bitbang->mdc, "mdc"))
+ goto out_free_bus;
- new_bus->parent = &ofdev->dev;
- dev_set_drvdata(&ofdev->dev, new_bus);
+ if (gpio_request(bitbang->mdio, "mdio"))
+ goto out_free_mdc;
+
+ dev_set_drvdata(dev, new_bus);
ret = mdiobus_register(new_bus);
if (ret)
- goto out_free_irqs;
+ goto out_free_all;
return 0;
-out_free_irqs:
- dev_set_drvdata(&ofdev->dev, NULL);
- kfree(new_bus->irq);
+out_free_all:
+ dev_set_drvdata(dev, NULL);
+ gpio_free(bitbang->mdio);
+out_free_mdc:
+ gpio_free(bitbang->mdc);
out_free_bus:
free_mdio_bitbang(new_bus);
out_free_bitbang:
@@ -162,16 +146,86 @@ out:
return ret;
}
-static int mdio_ofgpio_remove(struct of_device *ofdev)
+static void __devexit mdio_gpio_bus_destroy(struct device *dev)
{
- struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
+ struct mii_bus *bus = dev_get_drvdata(dev);
struct mdio_gpio_info *bitbang = bus->priv;
mdiobus_unregister(bus);
- kfree(bus->irq);
free_mdio_bitbang(bus);
- dev_set_drvdata(&ofdev->dev, NULL);
+ dev_set_drvdata(dev, NULL);
+ gpio_free(bitbang->mdc);
+ gpio_free(bitbang->mdio);
kfree(bitbang);
+}
+
+static int __devinit mdio_gpio_probe(struct platform_device *pdev)
+{
+ struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return -ENODEV;
+
+ return mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
+}
+
+static int __devexit mdio_gpio_remove(struct platform_device *pdev)
+{
+ mdio_gpio_bus_destroy(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF_GPIO
+static void __devinit add_phy(struct mdio_gpio_platform_data *pdata,
+ struct device_node *np)
+{
+ const u32 *data;
+ int len, id, irq;
+
+ data = of_get_property(np, "reg", &len);
+ if (!data || len != 4)
+ return;
+
+ id = *data;
+ pdata->phy_mask &= ~(1 << id);
+
+ irq = of_irq_to_resource(np, 0, NULL);
+ if (irq)
+ pdata->irqs[id] = irq;
+}
+
+static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct device_node *np = NULL;
+ struct mdio_gpio_platform_data *pdata;
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->mdc = of_get_gpio(ofdev->node, 0);
+ pdata->mdio = of_get_gpio(ofdev->node, 1);
+
+ if (pdata->mdc < 0 || pdata->mdio < 0)
+ goto out_free;
+
+ while ((np = of_get_next_child(ofdev->node, np)))
+ if (!strcmp(np->type, "ethernet-phy"))
+ add_phy(pdata, np);
+
+ return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
+
+out_free:
+ kfree(pdata);
+ return -ENODEV;
+}
+
+static int __devexit mdio_ofgpio_remove(struct of_device *ofdev)
+{
+ mdio_gpio_bus_destroy(&ofdev->dev);
+ kfree(ofdev->dev.platform_data);
return 0;
}
@@ -187,18 +241,56 @@ static struct of_platform_driver mdio_ofgpio_driver = {
.name = "mdio-gpio",
.match_table = mdio_ofgpio_match,
.probe = mdio_ofgpio_probe,
- .remove = mdio_ofgpio_remove,
+ .remove = __devexit_p(mdio_ofgpio_remove),
};
-static int mdio_ofgpio_init(void)
+static inline int __init mdio_ofgpio_init(void)
{
return of_register_platform_driver(&mdio_ofgpio_driver);
}
-static void mdio_ofgpio_exit(void)
+static inline void __exit mdio_ofgpio_exit(void)
{
of_unregister_platform_driver(&mdio_ofgpio_driver);
}
+#else
+static inline int __init mdio_ofgpio_init(void) { return 0; }
+static inline void __exit mdio_ofgpio_exit(void) { }
+#endif /* CONFIG_OF_GPIO */
+
+static struct platform_driver mdio_gpio_driver = {
+ .probe = mdio_gpio_probe,
+ .remove = __devexit_p(mdio_gpio_remove),
+ .driver = {
+ .name = "mdio-gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init mdio_gpio_init(void)
+{
+ int ret;
+
+ ret = mdio_ofgpio_init();
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&mdio_gpio_driver);
+ if (ret)
+ mdio_ofgpio_exit();
+
+ return ret;
+}
+module_init(mdio_gpio_init);
+
+static void __exit mdio_gpio_exit(void)
+{
+ platform_driver_unregister(&mdio_gpio_driver);
+ mdio_ofgpio_exit();
+}
+module_exit(mdio_gpio_exit);
-module_init(mdio_ofgpio_init);
-module_exit(mdio_ofgpio_exit);
+MODULE_ALIAS("platform:mdio-gpio");
+MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
diff --git a/include/linux/mdio-gpio.h b/include/linux/mdio-gpio.h
new file mode 100644
index 0000000..e9d3fdf
--- /dev/null
+++ b/include/linux/mdio-gpio.h
@@ -0,0 +1,25 @@
+/*
+ * MDIO-GPIO bus platform data structures
+ *
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef __LINUX_MDIO_GPIO_H
+#define __LINUX_MDIO_GPIO_H
+
+#include <linux/mdio-bitbang.h>
+
+struct mdio_gpio_platform_data {
+ /* GPIO numbers for bus pins */
+ unsigned int mdc;
+ unsigned int mdio;
+
+ unsigned int phy_mask;
+ int irqs[PHY_MAX_ADDR];
+};
+
+#endif /* __LINUX_MDIO_GPIO_H */
--
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