Release 4.17 drivers/usb/gadget/udc/fsl_mxc_udc.c
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2009
* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
*
* Description:
* Helper routines for i.MX3x SoCs from Freescale, needed by the fsl_usb2_udc.c
* driver to function correctly on these systems.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fsl_devices.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include "fsl_usb2_udc.h"
static struct clk *mxc_ahb_clk;
static struct clk *mxc_per_clk;
static struct clk *mxc_ipg_clk;
/* workaround ENGcm09152 for i.MX35 */
#define MX35_USBPHYCTRL_OFFSET 0x600
#define USBPHYCTRL_OTGBASE_OFFSET 0x8
#define USBPHYCTRL_EVDO (1 << 23)
int fsl_udc_clk_init(struct platform_device *pdev)
{
struct fsl_usb2_platform_data *pdata;
unsigned long freq;
int ret;
pdata = dev_get_platdata(&pdev->dev);
mxc_ipg_clk = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(mxc_ipg_clk)) {
dev_err(&pdev->dev, "clk_get(\"ipg\") failed\n");
return PTR_ERR(mxc_ipg_clk);
}
mxc_ahb_clk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(mxc_ahb_clk)) {
dev_err(&pdev->dev, "clk_get(\"ahb\") failed\n");
return PTR_ERR(mxc_ahb_clk);
}
mxc_per_clk = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(mxc_per_clk)) {
dev_err(&pdev->dev, "clk_get(\"per\") failed\n");
return PTR_ERR(mxc_per_clk);
}
clk_prepare_enable(mxc_ipg_clk);
clk_prepare_enable(mxc_ahb_clk);
clk_prepare_enable(mxc_per_clk);
/* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */
if (!strcmp(pdev->id_entry->name, "imx-udc-mx27")) {
freq = clk_get_rate(mxc_per_clk);
if (pdata->phy_mode != FSL_USB2_PHY_ULPI &&
(freq < 59999000 || freq > 60001000)) {
dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq);
ret = -EINVAL;
goto eclkrate;
}
}
return 0;
eclkrate:
clk_disable_unprepare(mxc_ipg_clk);
clk_disable_unprepare(mxc_ahb_clk);
clk_disable_unprepare(mxc_per_clk);
mxc_per_clk = NULL;
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 153 | 61.45% | 1 | 14.29% |
| Fabio Estevam | 70 | 28.11% | 2 | 28.57% |
| Peter Chen | 10 | 4.02% | 1 | 14.29% |
| Dinh Nguyen | 6 | 2.41% | 1 | 14.29% |
| Sascha Hauer | 6 | 2.41% | 1 | 14.29% |
| Jingoo Han | 4 | 1.61% | 1 | 14.29% |
| Total | 249 | 100.00% | 7 | 100.00% |
int fsl_udc_clk_finalize(struct platform_device *pdev)
{
struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
int ret = 0;
/* workaround ENGcm09152 for i.MX35 */
if (pdata->workaround & FLS_USB2_WORKAROUND_ENGCM09152) {
unsigned int v;
struct resource *res = platform_get_resource
(pdev, IORESOURCE_MEM, 0);
void __iomem *phy_regs = ioremap(res->start +
MX35_USBPHYCTRL_OFFSET, 512);
if (!phy_regs) {
dev_err(&pdev->dev, "ioremap for phy address fails\n");
ret = -EINVAL;
goto ioremap_err;
}
v = readl(phy_regs + USBPHYCTRL_OTGBASE_OFFSET);
writel(v | USBPHYCTRL_EVDO,
phy_regs + USBPHYCTRL_OTGBASE_OFFSET);
iounmap(phy_regs);
}
ioremap_err:
/* ULPI transceivers don't need usbpll */
if (pdata->phy_mode == FSL_USB2_PHY_ULPI) {
clk_disable_unprepare(mxc_per_clk);
mxc_per_clk = NULL;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Peter Chen | 74 | 50.00% | 1 | 16.67% |
| Guennadi Liakhovetski | 35 | 23.65% | 1 | 16.67% |
| Eric Bénard | 32 | 21.62% | 1 | 16.67% |
| Jingoo Han | 4 | 2.70% | 1 | 16.67% |
| Fabio Estevam | 3 | 2.03% | 2 | 33.33% |
| Total | 148 | 100.00% | 6 | 100.00% |
void fsl_udc_clk_release(void)
{
if (mxc_per_clk)
clk_disable_unprepare(mxc_per_clk);
clk_disable_unprepare(mxc_ahb_clk);
clk_disable_unprepare(mxc_ipg_clk);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 20 | 76.92% | 1 | 33.33% |
| Fabio Estevam | 6 | 23.08% | 2 | 66.67% |
| Total | 26 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Guennadi Liakhovetski | 234 | 49.06% | 1 | 7.69% |
| Peter Chen | 89 | 18.66% | 2 | 15.38% |
| Fabio Estevam | 87 | 18.24% | 3 | 23.08% |
| Eric Bénard | 40 | 8.39% | 1 | 7.69% |
| Sascha Hauer | 8 | 1.68% | 1 | 7.69% |
| Jingoo Han | 8 | 1.68% | 1 | 7.69% |
| Dinh Nguyen | 6 | 1.26% | 1 | 7.69% |
| Felipe Balbi | 3 | 0.63% | 1 | 7.69% |
| Greg Kroah-Hartman | 2 | 0.42% | 2 | 15.38% |
| Total | 477 | 100.00% | 13 | 100.00% |
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