diff options
Diffstat (limited to 'drivers/usb/chipidea/ci_hdrc_imx.c')
| -rw-r--r-- | drivers/usb/chipidea/ci_hdrc_imx.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c new file mode 100644 index 000000000000..37fdae5106ae --- /dev/null +++ b/drivers/usb/chipidea/ci_hdrc_imx.c @@ -0,0 +1,254 @@ +/* + * Copyright 2012 Freescale Semiconductor, Inc. + * Copyright (C) 2012 Marek Vasut <marex@denx.de> + * on behalf of DENX Software Engineering GmbH + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/of_gpio.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/dma-mapping.h> +#include <linux/usb/chipidea.h> +#include <linux/clk.h> +#include <linux/regulator/consumer.h> + +#include "ci.h" +#include "ci_hdrc_imx.h" + +#define pdev_to_phy(pdev) \ + ((struct usb_phy *)platform_get_drvdata(pdev)) + +struct ci_hdrc_imx_data { + struct usb_phy *phy; + struct platform_device *ci_pdev; + struct clk *clk; + struct regulator *reg_vbus; +}; + +static const struct usbmisc_ops *usbmisc_ops; + +/* Common functions shared by usbmisc drivers */ + +int usbmisc_set_ops(const struct usbmisc_ops *ops) +{ + if (usbmisc_ops) + return -EBUSY; + + usbmisc_ops = ops; + + return 0; +} +EXPORT_SYMBOL_GPL(usbmisc_set_ops); + +void usbmisc_unset_ops(const struct usbmisc_ops *ops) +{ + usbmisc_ops = NULL; +} +EXPORT_SYMBOL_GPL(usbmisc_unset_ops); + +int usbmisc_get_init_data(struct device *dev, struct usbmisc_usb_device *usbdev) +{ + struct device_node *np = dev->of_node; + struct of_phandle_args args; + int ret; + + usbdev->dev = dev; + + ret = of_parse_phandle_with_args(np, "fsl,usbmisc", "#index-cells", + 0, &args); + if (ret) { + dev_err(dev, "Failed to parse property fsl,usbmisc, errno %d\n", + ret); + memset(usbdev, 0, sizeof(*usbdev)); + return ret; + } + usbdev->index = args.args[0]; + of_node_put(args.np); + + if (of_find_property(np, "disable-over-current", NULL)) + usbdev->disable_oc = 1; + + if (of_find_property(np, "external-vbus-divider", NULL)) + usbdev->evdo = 1; + + return 0; +} +EXPORT_SYMBOL_GPL(usbmisc_get_init_data); + +/* End of common functions shared by usbmisc drivers*/ + +static int ci_hdrc_imx_probe(struct platform_device *pdev) +{ + struct ci_hdrc_imx_data *data; + struct ci_hdrc_platform_data pdata = { + .name = "ci_hdrc_imx", + .capoffset = DEF_CAPOFFSET, + .flags = CI_HDRC_REQUIRE_TRANSCEIVER | + CI_HDRC_PULLUP_ON_VBUS | + CI_HDRC_DISABLE_STREAMING, + }; + struct resource *res; + int ret; + struct usb_phy *phy; + + if (of_find_property(pdev->dev.of_node, "fsl,usbmisc", NULL) + && !usbmisc_ops) + return -EPROBE_DEFER; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) { + dev_err(&pdev->dev, "Failed to allocate ci_hdrc-imx data!\n"); + return -ENOMEM; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Can't get device resources!\n"); + return -ENOENT; + } + + data->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(data->clk)) { + dev_err(&pdev->dev, + "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); + return PTR_ERR(data->clk); + } + + ret = clk_prepare_enable(data->clk); + if (ret) { + dev_err(&pdev->dev, + "Failed to prepare or enable clock, err=%d\n", ret); + return ret; + } + + phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0); + if (!IS_ERR(phy)) { + ret = usb_phy_init(phy); + if (ret) { + dev_err(&pdev->dev, "unable to init phy: %d\n", ret); + goto err_clk; + } + } else if (PTR_ERR(phy) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_clk; + } + + /* we only support host now, so enable vbus here */ + data->reg_vbus = devm_regulator_get(&pdev->dev, "vbus"); + if (!IS_ERR(data->reg_vbus)) { + ret = regulator_enable(data->reg_vbus); + if (ret) { + dev_err(&pdev->dev, + "Failed to enable vbus regulator, err=%d\n", + ret); + goto err_clk; + } + } else { + data->reg_vbus = NULL; + } + + pdata.phy = data->phy; + + if (!pdev->dev.dma_mask) + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + if (!pdev->dev.coherent_dma_mask) + pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); + + if (usbmisc_ops && usbmisc_ops->init) { + ret = usbmisc_ops->init(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, + "usbmisc init failed, ret=%d\n", ret); + goto err; + } + } + + data->ci_pdev = ci_hdrc_add_device(&pdev->dev, + pdev->resource, pdev->num_resources, + &pdata); + if (IS_ERR(data->ci_pdev)) { + ret = PTR_ERR(data->ci_pdev); + dev_err(&pdev->dev, + "Can't register ci_hdrc platform device, err=%d\n", + ret); + goto err; + } + + if (usbmisc_ops && usbmisc_ops->post) { + ret = usbmisc_ops->post(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, + "usbmisc post failed, ret=%d\n", ret); + goto disable_device; + } + } + + platform_set_drvdata(pdev, data); + + pm_runtime_no_callbacks(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + return 0; + +disable_device: + ci_hdrc_remove_device(data->ci_pdev); +err: + if (data->reg_vbus) + regulator_disable(data->reg_vbus); +err_clk: + clk_disable_unprepare(data->clk); + return ret; +} + +static int ci_hdrc_imx_remove(struct platform_device *pdev) +{ + struct ci_hdrc_imx_data *data = platform_get_drvdata(pdev); + + pm_runtime_disable(&pdev->dev); + ci_hdrc_remove_device(data->ci_pdev); + + if (data->reg_vbus) + regulator_disable(data->reg_vbus); + + if (data->phy) { + usb_phy_shutdown(data->phy); + module_put(data->phy->dev->driver->owner); + } + + clk_disable_unprepare(data->clk); + + return 0; +} + +static const struct of_device_id ci_hdrc_imx_dt_ids[] = { + { .compatible = "fsl,imx27-usb", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids); + +static struct platform_driver ci_hdrc_imx_driver = { + .probe = ci_hdrc_imx_probe, + .remove = ci_hdrc_imx_remove, + .driver = { + .name = "imx_usb", + .owner = THIS_MODULE, + .of_match_table = ci_hdrc_imx_dt_ids, + }, +}; + +module_platform_driver(ci_hdrc_imx_driver); + +MODULE_ALIAS("platform:imx-usb"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("CI HDRC i.MX USB binding"); +MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); +MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); |