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https://github.com/adulau/aha.git
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phylib: make mdio-gpio work without OF (v4)
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@teltonika.lt> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paulius Zaleckas
David S. Miller
parent
72af187f21
commit
f004f3ea34
3 changed files with 196 additions and 76 deletions
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@ -86,8 +86,11 @@ config MDIO_BITBANG
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config MDIO_GPIO
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tristate "Support for GPIO lib-based bitbanged MDIO buses"
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depends on MDIO_BITBANG && OF_GPIO
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depends on MDIO_BITBANG && GENERIC_GPIO
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---help---
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Supports GPIO lib-based MDIO busses.
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To compile this driver as a module, choose M here: the module
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will be called mdio-gpio.
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endif # PHYLIB
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@ -1,9 +1,12 @@
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/*
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* OpenFirmware GPIO based MDIO bitbang driver.
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* GPIO based MDIO bitbang driver.
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* Supports OpenFirmware.
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*
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* Copyright (c) 2008 CSE Semaphore Belgium.
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* by Laurent Pinchart <laurentp@cse-semaphore.com>
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*
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* Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* Based on earlier work by
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*
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* Copyright (c) 2003 Intracom S.A.
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@ -21,9 +24,14 @@
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/mdio-bitbang.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/mdio-gpio.h>
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#ifdef CONFIG_OF_GPIO
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#include <linux/of_gpio.h>
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#include <linux/of_platform.h>
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#endif
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struct mdio_gpio_info {
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struct mdiobb_ctrl ctrl;
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@ -41,7 +49,7 @@ static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
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gpio_direction_input(bitbang->mdio);
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}
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static int mdio_read(struct mdiobb_ctrl *ctrl)
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static int mdio_get(struct mdiobb_ctrl *ctrl)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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@ -49,7 +57,7 @@ static int mdio_read(struct mdiobb_ctrl *ctrl)
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return gpio_get_value(bitbang->mdio);
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}
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static void mdio(struct mdiobb_ctrl *ctrl, int what)
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static void mdio_set(struct mdiobb_ctrl *ctrl, int what)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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@ -57,7 +65,7 @@ static void mdio(struct mdiobb_ctrl *ctrl, int what)
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gpio_set_value(bitbang->mdio, what);
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}
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static void mdc(struct mdiobb_ctrl *ctrl, int what)
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static void mdc_set(struct mdiobb_ctrl *ctrl, int what)
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{
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struct mdio_gpio_info *bitbang =
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container_of(ctrl, struct mdio_gpio_info, ctrl);
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@ -67,28 +75,110 @@ static void mdc(struct mdiobb_ctrl *ctrl, int what)
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static struct mdiobb_ops mdio_gpio_ops = {
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.owner = THIS_MODULE,
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.set_mdc = mdc,
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.set_mdc = mdc_set,
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.set_mdio_dir = mdio_dir,
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.set_mdio_data = mdio,
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.get_mdio_data = mdio_read,
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.set_mdio_data = mdio_set,
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.get_mdio_data = mdio_get,
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};
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static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
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struct device_node *np)
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static int __devinit mdio_gpio_bus_init(struct device *dev,
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struct mdio_gpio_platform_data *pdata,
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int bus_id)
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{
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struct mii_bus *new_bus;
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struct mdio_gpio_info *bitbang;
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int ret = -ENOMEM;
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int i;
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bitbang = kzalloc(sizeof(*bitbang), GFP_KERNEL);
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if (!bitbang)
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goto out;
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bitbang->ctrl.ops = &mdio_gpio_ops;
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bitbang->mdc = pdata->mdc;
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bitbang->mdio = pdata->mdio;
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new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
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if (!new_bus)
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goto out_free_bitbang;
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new_bus->name = "GPIO Bitbanged MDIO",
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ret = -ENODEV;
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new_bus->phy_mask = pdata->phy_mask;
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new_bus->irq = pdata->irqs;
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new_bus->parent = dev;
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if (new_bus->phy_mask == ~0)
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goto out_free_bus;
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for (i = 0; i < PHY_MAX_ADDR; i++)
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if (!new_bus->irq[i])
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new_bus->irq[i] = PHY_POLL;
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snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", bus_id);
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if (gpio_request(bitbang->mdc, "mdc"))
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goto out_free_bus;
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if (gpio_request(bitbang->mdio, "mdio"))
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goto out_free_mdc;
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dev_set_drvdata(dev, new_bus);
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ret = mdiobus_register(new_bus);
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if (ret)
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goto out_free_all;
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return 0;
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out_free_all:
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dev_set_drvdata(dev, NULL);
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gpio_free(bitbang->mdio);
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out_free_mdc:
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gpio_free(bitbang->mdc);
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out_free_bus:
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free_mdio_bitbang(new_bus);
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out_free_bitbang:
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kfree(bitbang);
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out:
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return ret;
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}
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static void __devexit mdio_gpio_bus_destroy(struct device *dev)
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{
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struct mii_bus *bus = dev_get_drvdata(dev);
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struct mdio_gpio_info *bitbang = bus->priv;
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bitbang->mdc = of_get_gpio(np, 0);
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bitbang->mdio = of_get_gpio(np, 1);
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mdiobus_unregister(bus);
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free_mdio_bitbang(bus);
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dev_set_drvdata(dev, NULL);
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gpio_free(bitbang->mdc);
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gpio_free(bitbang->mdio);
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kfree(bitbang);
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}
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if (bitbang->mdc < 0 || bitbang->mdio < 0)
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static int __devinit mdio_gpio_probe(struct platform_device *pdev)
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{
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struct mdio_gpio_platform_data *pdata = pdev->dev.platform_data;
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if (!pdata)
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return -ENODEV;
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snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc);
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return mdio_gpio_bus_init(&pdev->dev, pdata, pdev->id);
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}
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static int __devexit mdio_gpio_remove(struct platform_device *pdev)
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{
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mdio_gpio_bus_destroy(&pdev->dev);
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return 0;
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}
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static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
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#ifdef CONFIG_OF_GPIO
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static void __devinit add_phy(struct mdio_gpio_platform_data *pdata,
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struct device_node *np)
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{
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const u32 *data;
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int len, id, irq;
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@ -98,80 +188,44 @@ static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
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return;
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id = *data;
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bus->phy_mask &= ~(1 << id);
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pdata->phy_mask &= ~(1 << id);
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irq = of_irq_to_resource(np, 0, NULL);
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if (irq != NO_IRQ)
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bus->irq[id] = irq;
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if (irq)
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pdata->irqs[id] = irq;
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}
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static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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struct device_node *np = NULL;
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struct mii_bus *new_bus;
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struct mdio_gpio_info *bitbang;
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int ret = -ENOMEM;
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int i;
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struct mdio_gpio_platform_data *pdata;
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bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
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if (!bitbang)
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goto out;
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pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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bitbang->ctrl.ops = &mdio_gpio_ops;
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pdata->mdc = of_get_gpio(ofdev->node, 0);
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pdata->mdio = of_get_gpio(ofdev->node, 1);
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new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
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if (!new_bus)
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goto out_free_bitbang;
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new_bus->name = "GPIO Bitbanged MII",
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ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node);
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if (ret)
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goto out_free_bus;
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new_bus->phy_mask = ~0;
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new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
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if (!new_bus->irq)
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goto out_free_bus;
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for (i = 0; i < PHY_MAX_ADDR; i++)
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new_bus->irq[i] = -1;
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if (pdata->mdc < 0 || pdata->mdio < 0)
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goto out_free;
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while ((np = of_get_next_child(ofdev->node, np)))
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if (!strcmp(np->type, "ethernet-phy"))
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add_phy(new_bus, np);
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add_phy(pdata, np);
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new_bus->parent = &ofdev->dev;
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dev_set_drvdata(&ofdev->dev, new_bus);
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return mdio_gpio_bus_init(&ofdev->dev, pdata, pdata->mdc);
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ret = mdiobus_register(new_bus);
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if (ret)
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goto out_free_irqs;
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return 0;
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out_free_irqs:
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dev_set_drvdata(&ofdev->dev, NULL);
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kfree(new_bus->irq);
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out_free_bus:
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free_mdio_bitbang(new_bus);
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out_free_bitbang:
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kfree(bitbang);
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out:
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return ret;
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out_free:
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kfree(pdata);
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return -ENODEV;
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}
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static int mdio_ofgpio_remove(struct of_device *ofdev)
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static int __devexit mdio_ofgpio_remove(struct of_device *ofdev)
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{
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struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
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struct mdio_gpio_info *bitbang = bus->priv;
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mdiobus_unregister(bus);
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kfree(bus->irq);
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free_mdio_bitbang(bus);
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dev_set_drvdata(&ofdev->dev, NULL);
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kfree(bitbang);
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mdio_gpio_bus_destroy(&ofdev->dev);
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kfree(ofdev->dev.platform_data);
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return 0;
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}
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@ -187,18 +241,56 @@ static struct of_platform_driver mdio_ofgpio_driver = {
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.name = "mdio-gpio",
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.match_table = mdio_ofgpio_match,
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.probe = mdio_ofgpio_probe,
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.remove = mdio_ofgpio_remove,
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.remove = __devexit_p(mdio_ofgpio_remove),
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};
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static int mdio_ofgpio_init(void)
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static inline int __init mdio_ofgpio_init(void)
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{
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return of_register_platform_driver(&mdio_ofgpio_driver);
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}
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static void mdio_ofgpio_exit(void)
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static inline void __exit mdio_ofgpio_exit(void)
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{
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of_unregister_platform_driver(&mdio_ofgpio_driver);
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}
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#else
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static inline int __init mdio_ofgpio_init(void) { return 0; }
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static inline void __exit mdio_ofgpio_exit(void) { }
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#endif /* CONFIG_OF_GPIO */
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module_init(mdio_ofgpio_init);
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module_exit(mdio_ofgpio_exit);
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static struct platform_driver mdio_gpio_driver = {
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.probe = mdio_gpio_probe,
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.remove = __devexit_p(mdio_gpio_remove),
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.driver = {
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.name = "mdio-gpio",
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.owner = THIS_MODULE,
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},
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};
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static int __init mdio_gpio_init(void)
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{
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int ret;
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ret = mdio_ofgpio_init();
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if (ret)
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return ret;
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ret = platform_driver_register(&mdio_gpio_driver);
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if (ret)
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mdio_ofgpio_exit();
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return ret;
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}
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module_init(mdio_gpio_init);
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static void __exit mdio_gpio_exit(void)
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{
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platform_driver_unregister(&mdio_gpio_driver);
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mdio_ofgpio_exit();
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}
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module_exit(mdio_gpio_exit);
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MODULE_ALIAS("platform:mdio-gpio");
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MODULE_AUTHOR("Laurent Pinchart, Paulius Zaleckas");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Generic driver for MDIO bus emulation using GPIO");
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25
include/linux/mdio-gpio.h
Normal file
25
include/linux/mdio-gpio.h
Normal file
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@ -0,0 +1,25 @@
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/*
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* MDIO-GPIO bus platform data structures
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*
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* Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#ifndef __LINUX_MDIO_GPIO_H
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#define __LINUX_MDIO_GPIO_H
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#include <linux/mdio-bitbang.h>
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struct mdio_gpio_platform_data {
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/* GPIO numbers for bus pins */
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unsigned int mdc;
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unsigned int mdio;
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unsigned int phy_mask;
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int irqs[PHY_MAX_ADDR];
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};
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#endif /* __LINUX_MDIO_GPIO_H */
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