![Linus Torvalds](/assets/img/avatar_default.png)
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
350 lines
8.1 KiB
C
350 lines
8.1 KiB
C
/*
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* SAMSUNG EXYNOS USB HOST EHCI Controller
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*
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* Copyright (C) 2011 Samsung Electronics Co.Ltd
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* Author: Jingoo Han <jg1.han@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ehci.h"
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#define DRIVER_DESC "EHCI EXYNOS driver"
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#define EHCI_INSNREG00(base) (base + 0x90)
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#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
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#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
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#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
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#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
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#define EHCI_INSNREG00_ENABLE_DMA_BURST \
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(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
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EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
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static const char hcd_name[] = "ehci-exynos";
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static struct hc_driver __read_mostly exynos_ehci_hc_driver;
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#define PHY_NUMBER 3
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struct exynos_ehci_hcd {
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struct clk *clk;
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struct phy *phy[PHY_NUMBER];
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};
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#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
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static int exynos_ehci_get_phy(struct device *dev,
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struct exynos_ehci_hcd *exynos_ehci)
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{
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struct device_node *child;
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struct phy *phy;
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int phy_number;
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int ret;
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/* Get PHYs for the controller */
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for_each_available_child_of_node(dev->of_node, child) {
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ret = of_property_read_u32(child, "reg", &phy_number);
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if (ret) {
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dev_err(dev, "Failed to parse device tree\n");
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of_node_put(child);
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return ret;
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}
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if (phy_number >= PHY_NUMBER) {
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dev_err(dev, "Invalid number of PHYs\n");
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of_node_put(child);
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return -EINVAL;
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}
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phy = devm_of_phy_get(dev, child, NULL);
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exynos_ehci->phy[phy_number] = phy;
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if (IS_ERR(phy)) {
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ret = PTR_ERR(phy);
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if (ret == -EPROBE_DEFER) {
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return ret;
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} else if (ret != -ENOSYS && ret != -ENODEV) {
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dev_err(dev,
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"Error retrieving usb2 phy: %d\n", ret);
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return ret;
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}
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}
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}
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return 0;
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}
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static int exynos_ehci_phy_enable(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
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int i;
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int ret = 0;
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for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
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if (!IS_ERR(exynos_ehci->phy[i]))
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ret = phy_power_on(exynos_ehci->phy[i]);
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if (ret)
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for (i--; i >= 0; i--)
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if (!IS_ERR(exynos_ehci->phy[i]))
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phy_power_off(exynos_ehci->phy[i]);
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return ret;
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}
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static void exynos_ehci_phy_disable(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
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int i;
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for (i = 0; i < PHY_NUMBER; i++)
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if (!IS_ERR(exynos_ehci->phy[i]))
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phy_power_off(exynos_ehci->phy[i]);
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}
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static void exynos_setup_vbus_gpio(struct device *dev)
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{
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int err;
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int gpio;
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if (!dev->of_node)
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return;
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gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
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if (!gpio_is_valid(gpio))
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return;
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err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
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"ehci_vbus_gpio");
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if (err)
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dev_err(dev, "can't request ehci vbus gpio %d", gpio);
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}
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static int exynos_ehci_probe(struct platform_device *pdev)
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{
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struct exynos_ehci_hcd *exynos_ehci;
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct resource *res;
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int irq;
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int err;
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we move to full device tree support this will vanish off.
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*/
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err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (err)
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return err;
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exynos_setup_vbus_gpio(&pdev->dev);
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hcd = usb_create_hcd(&exynos_ehci_hc_driver,
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&pdev->dev, dev_name(&pdev->dev));
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if (!hcd) {
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dev_err(&pdev->dev, "Unable to create HCD\n");
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return -ENOMEM;
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}
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exynos_ehci = to_exynos_ehci(hcd);
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if (of_device_is_compatible(pdev->dev.of_node,
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"samsung,exynos5440-ehci"))
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goto skip_phy;
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err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
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if (err)
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goto fail_clk;
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skip_phy:
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exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
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if (IS_ERR(exynos_ehci->clk)) {
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dev_err(&pdev->dev, "Failed to get usbhost clock\n");
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err = PTR_ERR(exynos_ehci->clk);
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goto fail_clk;
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}
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err = clk_prepare_enable(exynos_ehci->clk);
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if (err)
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goto fail_clk;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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err = PTR_ERR(hcd->regs);
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goto fail_io;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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irq = platform_get_irq(pdev, 0);
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if (!irq) {
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dev_err(&pdev->dev, "Failed to get IRQ\n");
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err = -ENODEV;
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goto fail_io;
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}
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err = exynos_ehci_phy_enable(&pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Failed to enable USB phy\n");
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goto fail_io;
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}
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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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/* DMA burst Enable */
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err) {
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dev_err(&pdev->dev, "Failed to add USB HCD\n");
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goto fail_add_hcd;
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}
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device_wakeup_enable(hcd->self.controller);
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platform_set_drvdata(pdev, hcd);
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return 0;
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fail_add_hcd:
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exynos_ehci_phy_disable(&pdev->dev);
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fail_io:
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clk_disable_unprepare(exynos_ehci->clk);
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fail_clk:
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usb_put_hcd(hcd);
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return err;
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}
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static int exynos_ehci_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
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usb_remove_hcd(hcd);
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exynos_ehci_phy_disable(&pdev->dev);
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clk_disable_unprepare(exynos_ehci->clk);
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usb_put_hcd(hcd);
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return 0;
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}
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#ifdef CONFIG_PM
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static int exynos_ehci_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
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bool do_wakeup = device_may_wakeup(dev);
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int rc;
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rc = ehci_suspend(hcd, do_wakeup);
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if (rc)
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return rc;
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exynos_ehci_phy_disable(dev);
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clk_disable_unprepare(exynos_ehci->clk);
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return rc;
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}
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static int exynos_ehci_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
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int ret;
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clk_prepare_enable(exynos_ehci->clk);
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ret = exynos_ehci_phy_enable(dev);
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if (ret) {
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dev_err(dev, "Failed to enable USB phy\n");
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clk_disable_unprepare(exynos_ehci->clk);
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return ret;
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}
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/* DMA burst Enable */
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writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
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ehci_resume(hcd, false);
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return 0;
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}
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#else
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#define exynos_ehci_suspend NULL
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#define exynos_ehci_resume NULL
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#endif
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static const struct dev_pm_ops exynos_ehci_pm_ops = {
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.suspend = exynos_ehci_suspend,
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.resume = exynos_ehci_resume,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id exynos_ehci_match[] = {
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{ .compatible = "samsung,exynos4210-ehci" },
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{ .compatible = "samsung,exynos5440-ehci" },
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{},
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};
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MODULE_DEVICE_TABLE(of, exynos_ehci_match);
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#endif
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static struct platform_driver exynos_ehci_driver = {
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.probe = exynos_ehci_probe,
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.remove = exynos_ehci_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "exynos-ehci",
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.pm = &exynos_ehci_pm_ops,
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.of_match_table = of_match_ptr(exynos_ehci_match),
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}
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};
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static const struct ehci_driver_overrides exynos_overrides __initdata = {
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.extra_priv_size = sizeof(struct exynos_ehci_hcd),
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};
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static int __init ehci_exynos_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
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return platform_driver_register(&exynos_ehci_driver);
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}
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module_init(ehci_exynos_init);
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static void __exit ehci_exynos_cleanup(void)
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{
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platform_driver_unregister(&exynos_ehci_driver);
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}
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module_exit(ehci_exynos_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_ALIAS("platform:exynos-ehci");
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MODULE_AUTHOR("Jingoo Han");
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MODULE_AUTHOR("Joonyoung Shim");
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MODULE_LICENSE("GPL v2");
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