Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 |
| 3 | * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> |
| 4 | * |
| 5 | * Description: |
| 6 | * Helper routines for i.MX3x SoCs from Freescale, needed by the fsl_usb2_udc.c |
| 7 | * driver to function correctly on these systems. |
| 8 | * |
| 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. |
| 13 | */ |
| 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> |
Fabio Estevam | 65cd5c4 | 2011-11-22 13:48:28 -0200 | [diff] [blame] | 19 | #include <linux/io.h> |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 20 | |
| 21 | static struct clk *mxc_ahb_clk; |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 22 | static struct clk *mxc_per_clk; |
| 23 | static struct clk *mxc_ipg_clk; |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 24 | |
Eric Bénard | 69cb1ec | 2010-10-15 14:30:58 +0200 | [diff] [blame] | 25 | /* workaround ENGcm09152 for i.MX35 */ |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 26 | #define MX35_USBPHYCTRL_OFFSET 0x600 |
| 27 | #define USBPHYCTRL_OTGBASE_OFFSET 0x8 |
Eric Bénard | 69cb1ec | 2010-10-15 14:30:58 +0200 | [diff] [blame] | 28 | #define USBPHYCTRL_EVDO (1 << 23) |
| 29 | |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 30 | int fsl_udc_clk_init(struct platform_device *pdev) |
| 31 | { |
| 32 | struct fsl_usb2_platform_data *pdata; |
| 33 | unsigned long freq; |
| 34 | int ret; |
| 35 | |
Jingoo Han | e01ee9f | 2013-07-30 17:00:51 +0900 | [diff] [blame] | 36 | pdata = dev_get_platdata(&pdev->dev); |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 37 | |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 38 | mxc_ipg_clk = devm_clk_get(&pdev->dev, "ipg"); |
| 39 | if (IS_ERR(mxc_ipg_clk)) { |
| 40 | dev_err(&pdev->dev, "clk_get(\"ipg\") failed\n"); |
| 41 | return PTR_ERR(mxc_ipg_clk); |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 42 | } |
| 43 | |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 44 | mxc_ahb_clk = devm_clk_get(&pdev->dev, "ahb"); |
| 45 | if (IS_ERR(mxc_ahb_clk)) { |
| 46 | dev_err(&pdev->dev, "clk_get(\"ahb\") failed\n"); |
| 47 | return PTR_ERR(mxc_ahb_clk); |
| 48 | } |
| 49 | |
| 50 | mxc_per_clk = devm_clk_get(&pdev->dev, "per"); |
| 51 | if (IS_ERR(mxc_per_clk)) { |
| 52 | dev_err(&pdev->dev, "clk_get(\"per\") failed\n"); |
| 53 | return PTR_ERR(mxc_per_clk); |
| 54 | } |
| 55 | |
| 56 | clk_prepare_enable(mxc_ipg_clk); |
| 57 | clk_prepare_enable(mxc_ahb_clk); |
| 58 | clk_prepare_enable(mxc_per_clk); |
| 59 | |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 60 | /* make sure USB_CLK is running at 60 MHz +/- 1000 Hz */ |
Peter Chen | f0ea883 | 2013-01-17 18:03:15 +0800 | [diff] [blame] | 61 | if (!strcmp(pdev->id_entry->name, "imx-udc-mx27")) { |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 62 | freq = clk_get_rate(mxc_per_clk); |
Dinh Nguyen | 73a0bd7 | 2010-05-10 11:21:57 -0500 | [diff] [blame] | 63 | if (pdata->phy_mode != FSL_USB2_PHY_ULPI && |
| 64 | (freq < 59999000 || freq > 60001000)) { |
| 65 | dev_err(&pdev->dev, "USB_CLK=%lu, should be 60MHz\n", freq); |
| 66 | ret = -EINVAL; |
| 67 | goto eclkrate; |
| 68 | } |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 69 | } |
| 70 | |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 71 | return 0; |
| 72 | |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 73 | eclkrate: |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 74 | clk_disable_unprepare(mxc_ipg_clk); |
| 75 | clk_disable_unprepare(mxc_ahb_clk); |
| 76 | clk_disable_unprepare(mxc_per_clk); |
| 77 | mxc_per_clk = NULL; |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 78 | return ret; |
| 79 | } |
| 80 | |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 81 | int fsl_udc_clk_finalize(struct platform_device *pdev) |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 82 | { |
Jingoo Han | e01ee9f | 2013-07-30 17:00:51 +0900 | [diff] [blame] | 83 | struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev); |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 84 | int ret = 0; |
Eric Bénard | 69cb1ec | 2010-10-15 14:30:58 +0200 | [diff] [blame] | 85 | |
Peter Chen | f0ea883 | 2013-01-17 18:03:15 +0800 | [diff] [blame] | 86 | /* workaround ENGcm09152 for i.MX35 */ |
| 87 | if (pdata->workaround & FLS_USB2_WORKAROUND_ENGCM09152) { |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 88 | unsigned int v; |
| 89 | struct resource *res = platform_get_resource |
| 90 | (pdev, IORESOURCE_MEM, 0); |
| 91 | void __iomem *phy_regs = ioremap(res->start + |
| 92 | MX35_USBPHYCTRL_OFFSET, 512); |
| 93 | if (!phy_regs) { |
| 94 | dev_err(&pdev->dev, "ioremap for phy address fails\n"); |
| 95 | ret = -EINVAL; |
| 96 | goto ioremap_err; |
| 97 | } |
| 98 | |
| 99 | v = readl(phy_regs + USBPHYCTRL_OTGBASE_OFFSET); |
Peter Chen | f0ea883 | 2013-01-17 18:03:15 +0800 | [diff] [blame] | 100 | writel(v | USBPHYCTRL_EVDO, |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 101 | phy_regs + USBPHYCTRL_OTGBASE_OFFSET); |
| 102 | |
| 103 | iounmap(phy_regs); |
Eric Bénard | 69cb1ec | 2010-10-15 14:30:58 +0200 | [diff] [blame] | 104 | } |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 105 | |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 106 | |
| 107 | ioremap_err: |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 108 | /* ULPI transceivers don't need usbpll */ |
| 109 | if (pdata->phy_mode == FSL_USB2_PHY_ULPI) { |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 110 | clk_disable_unprepare(mxc_per_clk); |
| 111 | mxc_per_clk = NULL; |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 112 | } |
Peter Chen | c2c9caa | 2013-01-17 18:03:16 +0800 | [diff] [blame] | 113 | |
| 114 | return ret; |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | void fsl_udc_clk_release(void) |
| 118 | { |
Fabio Estevam | ba78917 | 2012-06-15 18:39:02 -0300 | [diff] [blame] | 119 | if (mxc_per_clk) |
| 120 | clk_disable_unprepare(mxc_per_clk); |
| 121 | clk_disable_unprepare(mxc_ahb_clk); |
| 122 | clk_disable_unprepare(mxc_ipg_clk); |
Guennadi Liakhovetski | 54e4026b | 2009-04-15 14:25:33 +0200 | [diff] [blame] | 123 | } |