3 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
6 * Helper routines for i.MX3x SoCs from Freescale, needed by the fsl_usb2_udc.c
7 * driver to function correctly on these systems.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/fsl_devices.h>
18 #include <linux/platform_device.h>
20 #include <mach/hardware.h>
22 static struct clk *mxc_ahb_clk;
23 static struct clk *mxc_usb_clk;
25 int fsl_udc_clk_init(struct platform_device *pdev)
27 struct fsl_usb2_platform_data *pdata;
31 pdata = pdev->dev.platform_data;
33 if (!cpu_is_mx35() && !cpu_is_mx25()) {
34 mxc_ahb_clk = clk_get(&pdev->dev, "usb_ahb");
35 if (IS_ERR(mxc_ahb_clk))
36 return PTR_ERR(mxc_ahb_clk);
38 ret = clk_enable(mxc_ahb_clk);
40 dev_err(&pdev->dev, "clk_enable(\"usb_ahb\") failed\n");
45 /* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */
46 mxc_usb_clk = clk_get(&pdev->dev, "usb");
47 if (IS_ERR(mxc_usb_clk)) {
48 dev_err(&pdev->dev, "clk_get(\"usb\") failed\n");
49 ret = PTR_ERR(mxc_usb_clk);
54 freq = clk_get_rate(mxc_usb_clk);
55 if (pdata->phy_mode != FSL_USB2_PHY_ULPI &&
56 (freq < 59999000 || freq > 60001000)) {
57 dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq);
63 ret = clk_enable(mxc_usb_clk);
65 dev_err(&pdev->dev, "clk_enable(\"usb_clk\") failed\n");
77 clk_disable(mxc_ahb_clk);
84 void fsl_udc_clk_finalize(struct platform_device *pdev)
86 struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
88 /* ULPI transceivers don't need usbpll */
89 if (pdata->phy_mode == FSL_USB2_PHY_ULPI) {
90 clk_disable(mxc_usb_clk);
96 void fsl_udc_clk_release(void)
99 clk_disable(mxc_usb_clk);
100 clk_put(mxc_usb_clk);
102 if (!cpu_is_mx35()) {
103 clk_disable(mxc_ahb_clk);
104 clk_put(mxc_ahb_clk);