Useful for machines where PHY control is connected to GPIO.
This driver also supports interrupts from PHY.
Changes since v2:
- add module author, description and license
- add module alias for udev
- rename mdc and mdio function (were ugly names)
- don't BUG kernel if phy address is invalid
- change MII to MDIO in name
- add __init __exit to module loading functions
- some cosmetic changes
Changes since v1:
- fixed releasing of gpio (thanks to Sascha Hauer)
- fixed compiling due to bus->dev to bus->parent change
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
---
drivers/net/phy/Kconfig | 9 ++
drivers/net/phy/Makefile | 1
drivers/net/phy/mdio-gpio.c | 200 +++++++++++++++++++++++++++++++++++++++++++
include/linux/mdio-gpio.h | 40 +++++++++
4 files changed, 250 insertions(+), 0 deletions(-)
create mode 100644 drivers/net/phy/mdio-gpio.c
create mode 100644 include/linux/mdio-gpio.h
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index d55932a..610fd88 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -84,6 +84,15 @@ config MDIO_BITBANG
If in doubt, say N.
+config MDIO_GPIO
+ tristate "Support for GPIO bitbanged MDIO buses"
+ depends on MDIO_BITBANG && GENERIC_GPIO
+ help
+ Supports MDIO busses connected to GPIO.
+
+ To compile this driver as a module, choose M here: the module
+ will be called mdio-gpio.
+
config MDIO_OF_GPIO
tristate "Support for GPIO lib-based bitbanged MDIO buses"
depends on MDIO_BITBANG && OF_GPIO
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index eee329f..8629b09 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -15,4 +15,5 @@ obj-$(CONFIG_ICPLUS_PHY) += icplus.o
obj-$(CONFIG_REALTEK_PHY) += realtek.o
obj-$(CONFIG_FIXED_PHY) += fixed.o
obj-$(CONFIG_MDIO_BITBANG) += mdio-bitbang.o
+obj-$(CONFIG_MDIO_GPIO) += mdio-gpio.o
obj-$(CONFIG_MDIO_OF_GPIO) += mdio-ofgpio.o
diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
new file mode 100644
index 0000000..c860468
--- /dev/null
+++ b/drivers/net/phy/mdio-gpio.c
@@ -0,0 +1,200 @@
+/*
+ * GPIO based MDIO bitbang driver.
+ *
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
+ *
+ * Based on mdio-ofgpio.c:
+ *
+ * Copyright (c) 2008 CSE Semaphore Belgium.
+ * by Laurent Pinchart <laurentp@xxxxxxxxxxxxxxxxx>
+ *
+ * Copyright (c) 2003 Intracom S.A.
+ * by Pantelis Antoniou <panto@xxxxxxxxxxx>
+ *
+ * 2005 (c) MontaVista Software, Inc.
+ * Vitaly Bordug <vbordug@xxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/mdio-bitbang.h>
+#include <linux/mdio-gpio.h>
+
+struct mdio_gpio_info {
+ struct mdiobb_ctrl ctrl;
+ unsigned int mdc, mdio;
+};
+
+static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
+{
+ struct mdio_gpio_info *bitbang =
+ container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+ if (dir)
+ gpio_direction_output(bitbang->mdio, 1);
+ else
+ gpio_direction_input(bitbang->mdio);
+}
+
+static int mdio_get(struct mdiobb_ctrl *ctrl)
+{
+ struct mdio_gpio_info *bitbang =
+ container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+ return gpio_get_value(bitbang->mdio);
+}
+
+static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
+{
+ struct mdio_gpio_info *bitbang =
+ container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+ gpio_set_value(bitbang->mdio, what);
+}
+
+static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
+{
+ struct mdio_gpio_info *bitbang =
+ container_of(ctrl, struct mdio_gpio_info, ctrl);
+
+ gpio_set_value(bitbang->mdc, what);
+}
+
+static struct mdiobb_ops mdio_gpio_ops = {
+ .owner = THIS_MODULE,
+ .set_mdc = mdc_set,
+ .set_mdio_dir = mdio_dir,
+ .set_mdio_data = mdio_set,
+ .get_mdio_data = mdio_get,
+};
+
+static int __devinit mdio_gpio_probe(struct platform_device *pdev)
+{
+ struct mii_bus *new_bus;
+ struct mdio_gpio_info *bitbang;
+ struct mdio_gpio_platform_data *pdata;
+ int ret = -ENOMEM;
+ int i;
+
+ pdata = pdev->dev.platform_data;
+ if (pdata == NULL)
+ goto out;
+
+ bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
+ if (!bitbang)
+ goto out;
+
+ bitbang->ctrl.ops = &mdio_gpio_ops;
+ bitbang->mdc = pdata->mdc;
+ bitbang->mdio = pdata->mdio;
+
+ if (gpio_request(bitbang->mdc, "mdc"))
+ goto out_free_bitbang;
+
+ if (gpio_request(bitbang->mdio, "mdio"))
+ goto out_free_mdc;
+
+ new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+ if (!new_bus)
+ goto out_free_gpio;
+
+ new_bus->name = "GPIO Bitbanged MDIO",
+ snprintf(new_bus->id, MII_BUS_ID_SIZE, "phy%i", pdev->id);
+
+ new_bus->phy_mask = ~0;
+ new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+ if (!new_bus->irq)
+ goto out_free_bus;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++)
+ new_bus->irq[i] = PHY_POLL;
+
+ for (i = 0; i < pdata->nr_phys; i++) {
+ unsigned int phy_addr = pdata->phys[i].addr;
+
+ if (phy_addr >= PHY_MAX_ADDR) {
+ dev_err(&pdev->dev,
+ "Failed to add phy with invalid address: 0x%x",
+ phy_addr);
+ continue;
+ }
+
+ new_bus->phy_mask &= ~(1 << phy_addr);
+ new_bus->irq[phy_addr] = pdata->phys[i].irq;
+ }
+
+ if (new_bus->phy_mask == ~0)
+ goto out_free_irq;
+
+ new_bus->parent = &pdev->dev;
+ platform_set_drvdata(pdev, new_bus);
+
+ ret = mdiobus_register(new_bus);
+ if (ret)
+ goto out_free_all;
+
+ return 0;
+
+out_free_all:
+ platform_set_drvdata(pdev, NULL);
+out_free_irq:
+ kfree(new_bus->irq);
+out_free_bus:
+ free_mdio_bitbang(new_bus);
+out_free_gpio:
+ gpio_free(bitbang->mdio);
+out_free_mdc:
+ gpio_free(bitbang->mdc);
+out_free_bitbang:
+ kfree(bitbang);
+out:
+ return ret;
+}
+
+static int __devexit mdio_gpio_remove(struct platform_device *pdev)
+{
+ struct mii_bus *bus = platform_get_drvdata(pdev);
+ struct mdio_gpio_info *bitbang = bus->priv;
+
+ mdiobus_unregister(bus);
+ kfree(bus->irq);
+ free_mdio_bitbang(bus);
+ platform_set_drvdata(pdev, NULL);
+ gpio_free(bitbang->mdc);
+ gpio_free(bitbang->mdio);
+ kfree(bitbang);
+
+ return 0;
+}
+
+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)
+{
+ return platform_driver_register(&mdio_gpio_driver);
+}
+module_init(mdio_gpio_init);
+
+static void __exit mdio_gpio_exit(void)
+{
+ platform_driver_unregister(&mdio_gpio_driver);
+}
+module_exit(mdio_gpio_exit);
+
+MODULE_ALIAS("platform:mdio-gpio");
+MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>");
+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..82d5fa4
--- /dev/null
+++ b/include/linux/mdio-gpio.h
@@ -0,0 +1,40 @@
+/*
+ * MDIO-GPIO bus platform data structures
+ *
+ * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __LINUX_MDIO_GPIO_H
+#define __LINUX_MDIO_GPIO_H
+
+struct mdio_gpio_phy {
+ /* PHY address on MDIO bus */
+ unsigned int addr;
+ /* preconfigured irq connected to PHY or -1 if no irq */
+ int irq;
+};
+
+struct mdio_gpio_platform_data {
+ /* GPIO numbers for bus pins */
+ unsigned int mdc;
+ unsigned int mdio;
+
+ unsigned int nr_phys;
+ struct mdio_gpio_phy *phys;
+};
+
+#endif /* __LINUX_MDIO_GPIO_H */
--
To unsubscribe from this list: send the line "unsubscribe linux-embedded" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
