mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
327 lines
7.5 KiB
327 lines
7.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* SAMSUNG EXYNOS USB HOST OHCI Controller |
|
* |
|
* Copyright (C) 2011 Samsung Electronics Co.Ltd |
|
* Author: Jingoo Han <[email protected]> |
|
*/ |
|
|
|
#include <linux/clk.h> |
|
#include <linux/dma-mapping.h> |
|
#include <linux/io.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/of.h> |
|
#include <linux/platform_device.h> |
|
#include <linux/phy/phy.h> |
|
#include <linux/usb.h> |
|
#include <linux/usb/hcd.h> |
|
|
|
#include "ohci.h" |
|
|
|
#define DRIVER_DESC "OHCI Exynos driver" |
|
|
|
static const char hcd_name[] = "ohci-exynos"; |
|
static struct hc_driver __read_mostly exynos_ohci_hc_driver; |
|
|
|
#define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) |
|
|
|
#define PHY_NUMBER 3 |
|
|
|
struct exynos_ohci_hcd { |
|
struct clk *clk; |
|
struct device_node *of_node; |
|
struct phy *phy[PHY_NUMBER]; |
|
bool legacy_phy; |
|
}; |
|
|
|
static int exynos_ohci_get_phy(struct device *dev, |
|
struct exynos_ohci_hcd *exynos_ohci) |
|
{ |
|
struct device_node *child; |
|
struct phy *phy; |
|
int phy_number, num_phys; |
|
int ret; |
|
|
|
/* Get PHYs for the controller */ |
|
num_phys = of_count_phandle_with_args(dev->of_node, "phys", |
|
"#phy-cells"); |
|
for (phy_number = 0; phy_number < num_phys; phy_number++) { |
|
phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number); |
|
if (IS_ERR(phy)) |
|
return PTR_ERR(phy); |
|
exynos_ohci->phy[phy_number] = phy; |
|
} |
|
if (num_phys > 0) |
|
return 0; |
|
|
|
/* Get PHYs using legacy bindings */ |
|
for_each_available_child_of_node(dev->of_node, child) { |
|
ret = of_property_read_u32(child, "reg", &phy_number); |
|
if (ret) { |
|
dev_err(dev, "Failed to parse device tree\n"); |
|
of_node_put(child); |
|
return ret; |
|
} |
|
|
|
if (phy_number >= PHY_NUMBER) { |
|
dev_err(dev, "Invalid number of PHYs\n"); |
|
of_node_put(child); |
|
return -EINVAL; |
|
} |
|
|
|
phy = devm_of_phy_get(dev, child, NULL); |
|
exynos_ohci->phy[phy_number] = phy; |
|
if (IS_ERR(phy)) { |
|
ret = PTR_ERR(phy); |
|
if (ret == -EPROBE_DEFER) { |
|
of_node_put(child); |
|
return ret; |
|
} else if (ret != -ENOSYS && ret != -ENODEV) { |
|
dev_err(dev, |
|
"Error retrieving usb2 phy: %d\n", ret); |
|
of_node_put(child); |
|
return ret; |
|
} |
|
} |
|
} |
|
|
|
exynos_ohci->legacy_phy = true; |
|
return 0; |
|
} |
|
|
|
static int exynos_ohci_phy_enable(struct device *dev) |
|
{ |
|
struct usb_hcd *hcd = dev_get_drvdata(dev); |
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
|
int i; |
|
int ret = 0; |
|
|
|
for (i = 0; ret == 0 && i < PHY_NUMBER; i++) |
|
if (!IS_ERR(exynos_ohci->phy[i])) |
|
ret = phy_power_on(exynos_ohci->phy[i]); |
|
if (ret) |
|
for (i--; i >= 0; i--) |
|
if (!IS_ERR(exynos_ohci->phy[i])) |
|
phy_power_off(exynos_ohci->phy[i]); |
|
|
|
return ret; |
|
} |
|
|
|
static void exynos_ohci_phy_disable(struct device *dev) |
|
{ |
|
struct usb_hcd *hcd = dev_get_drvdata(dev); |
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
|
int i; |
|
|
|
for (i = 0; i < PHY_NUMBER; i++) |
|
if (!IS_ERR(exynos_ohci->phy[i])) |
|
phy_power_off(exynos_ohci->phy[i]); |
|
} |
|
|
|
static int exynos_ohci_probe(struct platform_device *pdev) |
|
{ |
|
struct exynos_ohci_hcd *exynos_ohci; |
|
struct usb_hcd *hcd; |
|
struct resource *res; |
|
int irq; |
|
int err; |
|
|
|
/* |
|
* Right now device-tree probed devices don't get dma_mask set. |
|
* Since shared usb code relies on it, set it here for now. |
|
* Once we move to full device tree support this will vanish off. |
|
*/ |
|
err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
|
if (err) |
|
return err; |
|
|
|
hcd = usb_create_hcd(&exynos_ohci_hc_driver, |
|
&pdev->dev, dev_name(&pdev->dev)); |
|
if (!hcd) { |
|
dev_err(&pdev->dev, "Unable to create HCD\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
exynos_ohci = to_exynos_ohci(hcd); |
|
|
|
err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); |
|
if (err) |
|
goto fail_clk; |
|
|
|
exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); |
|
|
|
if (IS_ERR(exynos_ohci->clk)) { |
|
dev_err(&pdev->dev, "Failed to get usbhost clock\n"); |
|
err = PTR_ERR(exynos_ohci->clk); |
|
goto fail_clk; |
|
} |
|
|
|
err = clk_prepare_enable(exynos_ohci->clk); |
|
if (err) |
|
goto fail_clk; |
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
|
if (IS_ERR(hcd->regs)) { |
|
err = PTR_ERR(hcd->regs); |
|
goto fail_io; |
|
} |
|
hcd->rsrc_start = res->start; |
|
hcd->rsrc_len = resource_size(res); |
|
|
|
irq = platform_get_irq(pdev, 0); |
|
if (irq < 0) { |
|
err = irq; |
|
goto fail_io; |
|
} |
|
|
|
platform_set_drvdata(pdev, hcd); |
|
|
|
err = exynos_ohci_phy_enable(&pdev->dev); |
|
if (err) { |
|
dev_err(&pdev->dev, "Failed to enable USB phy\n"); |
|
goto fail_io; |
|
} |
|
|
|
/* |
|
* Workaround: reset of_node pointer to avoid conflict between legacy |
|
* Exynos OHCI port subnodes and generic USB device bindings |
|
*/ |
|
exynos_ohci->of_node = pdev->dev.of_node; |
|
if (exynos_ohci->legacy_phy) |
|
pdev->dev.of_node = NULL; |
|
|
|
err = usb_add_hcd(hcd, irq, IRQF_SHARED); |
|
if (err) { |
|
dev_err(&pdev->dev, "Failed to add USB HCD\n"); |
|
goto fail_add_hcd; |
|
} |
|
device_wakeup_enable(hcd->self.controller); |
|
return 0; |
|
|
|
fail_add_hcd: |
|
exynos_ohci_phy_disable(&pdev->dev); |
|
pdev->dev.of_node = exynos_ohci->of_node; |
|
fail_io: |
|
clk_disable_unprepare(exynos_ohci->clk); |
|
fail_clk: |
|
usb_put_hcd(hcd); |
|
return err; |
|
} |
|
|
|
static int exynos_ohci_remove(struct platform_device *pdev) |
|
{ |
|
struct usb_hcd *hcd = platform_get_drvdata(pdev); |
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
|
|
|
pdev->dev.of_node = exynos_ohci->of_node; |
|
|
|
usb_remove_hcd(hcd); |
|
|
|
exynos_ohci_phy_disable(&pdev->dev); |
|
|
|
clk_disable_unprepare(exynos_ohci->clk); |
|
|
|
usb_put_hcd(hcd); |
|
|
|
return 0; |
|
} |
|
|
|
static void exynos_ohci_shutdown(struct platform_device *pdev) |
|
{ |
|
struct usb_hcd *hcd = platform_get_drvdata(pdev); |
|
|
|
if (hcd->driver->shutdown) |
|
hcd->driver->shutdown(hcd); |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
static int exynos_ohci_suspend(struct device *dev) |
|
{ |
|
struct usb_hcd *hcd = dev_get_drvdata(dev); |
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
|
bool do_wakeup = device_may_wakeup(dev); |
|
int rc = ohci_suspend(hcd, do_wakeup); |
|
|
|
if (rc) |
|
return rc; |
|
|
|
exynos_ohci_phy_disable(dev); |
|
|
|
clk_disable_unprepare(exynos_ohci->clk); |
|
|
|
return 0; |
|
} |
|
|
|
static int exynos_ohci_resume(struct device *dev) |
|
{ |
|
struct usb_hcd *hcd = dev_get_drvdata(dev); |
|
struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); |
|
int ret; |
|
|
|
clk_prepare_enable(exynos_ohci->clk); |
|
|
|
ret = exynos_ohci_phy_enable(dev); |
|
if (ret) { |
|
dev_err(dev, "Failed to enable USB phy\n"); |
|
clk_disable_unprepare(exynos_ohci->clk); |
|
return ret; |
|
} |
|
|
|
ohci_resume(hcd, false); |
|
|
|
return 0; |
|
} |
|
#else |
|
#define exynos_ohci_suspend NULL |
|
#define exynos_ohci_resume NULL |
|
#endif |
|
|
|
static const struct ohci_driver_overrides exynos_overrides __initconst = { |
|
.extra_priv_size = sizeof(struct exynos_ohci_hcd), |
|
}; |
|
|
|
static const struct dev_pm_ops exynos_ohci_pm_ops = { |
|
.suspend = exynos_ohci_suspend, |
|
.resume = exynos_ohci_resume, |
|
}; |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id exynos_ohci_match[] = { |
|
{ .compatible = "samsung,exynos4210-ohci" }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, exynos_ohci_match); |
|
#endif |
|
|
|
static struct platform_driver exynos_ohci_driver = { |
|
.probe = exynos_ohci_probe, |
|
.remove = exynos_ohci_remove, |
|
.shutdown = exynos_ohci_shutdown, |
|
.driver = { |
|
.name = "exynos-ohci", |
|
.pm = &exynos_ohci_pm_ops, |
|
.of_match_table = of_match_ptr(exynos_ohci_match), |
|
} |
|
}; |
|
static int __init ohci_exynos_init(void) |
|
{ |
|
if (usb_disabled()) |
|
return -ENODEV; |
|
|
|
pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
|
ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides); |
|
return platform_driver_register(&exynos_ohci_driver); |
|
} |
|
module_init(ohci_exynos_init); |
|
|
|
static void __exit ohci_exynos_cleanup(void) |
|
{ |
|
platform_driver_unregister(&exynos_ohci_driver); |
|
} |
|
module_exit(ohci_exynos_cleanup); |
|
|
|
MODULE_ALIAS("platform:exynos-ohci"); |
|
MODULE_AUTHOR("Jingoo Han <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|