linux/drivers/usb/phy/phy-keystone.c

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/*
* phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
*
* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
* 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.
*
* Author: WingMan Kwok <w-kwok2@ti.com>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/usb_phy_generic.h>
#include <linux/io.h>
#include <linux/of.h>
#include "phy-generic.h"
/* USB PHY control register offsets */
#define USB_PHY_CTL_UTMI 0x0000
#define USB_PHY_CTL_PIPE 0x0004
#define USB_PHY_CTL_PARAM_1 0x0008
#define USB_PHY_CTL_PARAM_2 0x000c
#define USB_PHY_CTL_CLOCK 0x0010
#define USB_PHY_CTL_PLL 0x0014
#define PHY_REF_SSP_EN BIT(29)
struct keystone_usbphy {
struct usb_phy_generic usb_phy_gen;
void __iomem *phy_ctrl;
};
static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
{
return readl(base + offset);
}
static inline void keystone_usbphy_writel(void __iomem *base,
u32 offset, u32 value)
{
writel(value, base + offset);
}
static int keystone_usbphy_init(struct usb_phy *phy)
{
struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
u32 val;
val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
val | PHY_REF_SSP_EN);
return 0;
}
static void keystone_usbphy_shutdown(struct usb_phy *phy)
{
struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
u32 val;
val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
val &= ~PHY_REF_SSP_EN);
}
static int keystone_usbphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct keystone_usbphy *k_phy;
struct resource *res;
int ret;
k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
if (!k_phy)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
if (IS_ERR(k_phy->phy_ctrl))
return PTR_ERR(k_phy->phy_ctrl);
Linux 3.13-rc4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iQEcBAABAgAGBQJSrhGrAAoJEHm+PkMAQRiGsNoH/jIK3CsQ2lbW7yRLXmfgtbzz i2Kep6D4SDvmaLpLYOVC8xNYTiE8jtTbSXHomwP5wMZ63MQDhBfnEWsEWqeZ9+D9 3Q46p0QWuoBgYu2VGkoxTfygkT6hhSpwWIi3SeImbY4fg57OHiUil/+YGhORM4Qc K4549OCTY3sIrgmWL77gzqjRUo+pQ4C73NKqZ3+5nlOmYBZC1yugk8mFwEpQkwhK 4NRNU760Fo+XIht/bINqRiPMddzC15p0mxvJy3cDW8bZa1tFSS9SB7AQUULBbcHL +2dFlFOEb5SV1sNiNPrJ0W+h2qUh2e7kPB0F8epaBppgbwVdyQoC2u4uuLV2ZN0= =lI2r -----END PGP SIGNATURE----- Merge tag 'v3.13-rc4' into next Linux 3.13-rc4 * tag 'v3.13-rc4': (1001 commits) Linux 3.13-rc4 null_blk: mem garbage on NUMA systems during init radeon_pm: fix oops in hwmon_attributes_visible() and radeon_hwmon_show_temp_thresh() Revert "selinux: consider filesystem subtype in policies" igb: Fix for issue where values could be too high for udelay function. i40e: fix null dereference ARM: fix asm/memory.h build error dm array: fix a reference counting bug in shadow_ablock dm space map: disallow decrementing a reference count below zero mm: memcg: do not allow task about to OOM kill to bypass the limit mm: memcg: fix race condition between memcg teardown and swapin thp: move preallocated PTE page table on move_huge_pmd() mfd/rtc: s5m: fix register updating by adding regmap for RTC rtc: s5m: enable IRQ wake during suspend rtc: s5m: limit endless loop waiting for register update rtc: s5m: fix unsuccesful IRQ request during probe drivers/rtc/rtc-s5m.c: fix info->rtc assignment include/linux/kernel.h: make might_fault() a nop for !MMU drivers/rtc/rtc-at91rm9200.c: correct alarm over day/month wrap procfs: also fix proc_reg_get_unmapped_area() for !MMU case ... Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-12-19 23:18:53 +08:00
ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL);
if (ret)
return ret;
k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
platform_set_drvdata(pdev, k_phy);
ret = usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
if (ret)
return ret;
return 0;
}
static int keystone_usbphy_remove(struct platform_device *pdev)
{
struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
usb_remove_phy(&k_phy->usb_phy_gen.phy);
return 0;
}
static const struct of_device_id keystone_usbphy_ids[] = {
{ .compatible = "ti,keystone-usbphy" },
{ }
};
MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
static struct platform_driver keystone_usbphy_driver = {
.probe = keystone_usbphy_probe,
.remove = keystone_usbphy_remove,
.driver = {
.name = "keystone-usbphy",
.owner = THIS_MODULE,
.of_match_table = keystone_usbphy_ids,
},
};
module_platform_driver(keystone_usbphy_driver);
MODULE_ALIAS("platform:keystone-usbphy");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_DESCRIPTION("Keystone USB phy driver");
MODULE_LICENSE("GPL v2");