![Julia Lawall](/assets/img/avatar_default.png)
Return a negative error code on failure. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e1,e2; @@ ( if (\(ret < 0\|ret != 0\)) { ... return ret; } | ret = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Felipe Balbi <balbi@ti.com>
198 lines
4.7 KiB
C
198 lines
4.7 KiB
C
/**
|
|
* dwc3-keystone.c - Keystone Specific Glue layer
|
|
*
|
|
* Copyright (C) 2010-2013 Texas Instruments Incorporated - http://www.ti.com
|
|
*
|
|
* Author: WingMan Kwok <w-kwok2@ti.com>
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 of
|
|
* the License as published by the Free Software Foundation.
|
|
*
|
|
* 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/clk.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
/* USBSS register offsets */
|
|
#define USBSS_REVISION 0x0000
|
|
#define USBSS_SYSCONFIG 0x0010
|
|
#define USBSS_IRQ_EOI 0x0018
|
|
#define USBSS_IRQSTATUS_RAW_0 0x0020
|
|
#define USBSS_IRQSTATUS_0 0x0024
|
|
#define USBSS_IRQENABLE_SET_0 0x0028
|
|
#define USBSS_IRQENABLE_CLR_0 0x002c
|
|
|
|
/* IRQ register bits */
|
|
#define USBSS_IRQ_EOI_LINE(n) BIT(n)
|
|
#define USBSS_IRQ_EVENT_ST BIT(0)
|
|
#define USBSS_IRQ_COREIRQ_EN BIT(0)
|
|
#define USBSS_IRQ_COREIRQ_CLR BIT(0)
|
|
|
|
static u64 kdwc3_dma_mask;
|
|
|
|
struct dwc3_keystone {
|
|
struct device *dev;
|
|
struct clk *clk;
|
|
void __iomem *usbss;
|
|
};
|
|
|
|
static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
|
|
{
|
|
return readl(base + offset);
|
|
}
|
|
|
|
static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
|
|
{
|
|
writel(value, base + offset);
|
|
}
|
|
|
|
static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
|
|
{
|
|
u32 val;
|
|
|
|
val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
|
|
val |= USBSS_IRQ_COREIRQ_EN;
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
|
|
}
|
|
|
|
static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
|
|
{
|
|
u32 val;
|
|
|
|
val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
|
|
val &= ~USBSS_IRQ_COREIRQ_EN;
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
|
|
}
|
|
|
|
static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
|
|
{
|
|
struct dwc3_keystone *kdwc = _kdwc;
|
|
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
|
|
kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int kdwc3_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct dwc3_keystone *kdwc;
|
|
struct resource *res;
|
|
int error, irq;
|
|
|
|
kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
|
|
if (!kdwc)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, kdwc);
|
|
|
|
kdwc->dev = dev;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
kdwc->usbss = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(kdwc->usbss))
|
|
return PTR_ERR(kdwc->usbss);
|
|
|
|
kdwc3_dma_mask = dma_get_mask(dev);
|
|
dev->dma_mask = &kdwc3_dma_mask;
|
|
|
|
kdwc->clk = devm_clk_get(kdwc->dev, "usb");
|
|
|
|
error = clk_prepare_enable(kdwc->clk);
|
|
if (error < 0) {
|
|
dev_dbg(kdwc->dev, "unable to enable usb clock, err %d\n",
|
|
error);
|
|
return error;
|
|
}
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
dev_err(&pdev->dev, "missing irq\n");
|
|
error = irq;
|
|
goto err_irq;
|
|
}
|
|
|
|
error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
|
|
dev_name(dev), kdwc);
|
|
if (error) {
|
|
dev_err(dev, "failed to request IRQ #%d --> %d\n",
|
|
irq, error);
|
|
goto err_irq;
|
|
}
|
|
|
|
kdwc3_enable_irqs(kdwc);
|
|
|
|
error = of_platform_populate(node, NULL, NULL, dev);
|
|
if (error) {
|
|
dev_err(&pdev->dev, "failed to create dwc3 core\n");
|
|
goto err_core;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_core:
|
|
kdwc3_disable_irqs(kdwc);
|
|
err_irq:
|
|
clk_disable_unprepare(kdwc->clk);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int kdwc3_remove_core(struct device *dev, void *c)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
platform_device_unregister(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kdwc3_remove(struct platform_device *pdev)
|
|
{
|
|
struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
|
|
|
|
kdwc3_disable_irqs(kdwc);
|
|
device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
|
|
clk_disable_unprepare(kdwc->clk);
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id kdwc3_of_match[] = {
|
|
{ .compatible = "ti,keystone-dwc3", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, kdwc3_of_match);
|
|
|
|
static struct platform_driver kdwc3_driver = {
|
|
.probe = kdwc3_probe,
|
|
.remove = kdwc3_remove,
|
|
.driver = {
|
|
.name = "keystone-dwc3",
|
|
.of_match_table = kdwc3_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(kdwc3_driver);
|
|
|
|
MODULE_ALIAS("platform:keystone-dwc3");
|
|
MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");
|