Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for EHCI UHP on Atmel chips |
| 3 | * |
| 4 | * Copyright (C) 2009 Atmel Corporation, |
| 5 | * Nicolas Ferre <nicolas.ferre@atmel.com> |
| 6 | * |
| 7 | * Based on various ehci-*.c drivers |
| 8 | * |
| 9 | * This file is subject to the terms and conditions of the GNU General Public |
| 10 | * License. See the file COPYING in the main directory of this archive for |
| 11 | * more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/clk.h> |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 15 | #include <linux/dma-mapping.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
Nicolas Ferre | 9475375 | 2012-03-27 18:23:31 +0200 | [diff] [blame] | 19 | #include <linux/of.h> |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 20 | #include <linux/of_platform.h> |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/usb.h> |
| 23 | #include <linux/usb/hcd.h> |
| 24 | |
| 25 | #include "ehci.h" |
| 26 | |
| 27 | #define DRIVER_DESC "EHCI Atmel driver" |
| 28 | |
| 29 | static const char hcd_name[] = "ehci-atmel"; |
| 30 | static struct hc_driver __read_mostly ehci_atmel_hc_driver; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 31 | |
| 32 | /* interface and function clocks */ |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 33 | static struct clk *iclk, *fclk, *uclk; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 34 | static int clocked; |
| 35 | |
| 36 | /*-------------------------------------------------------------------------*/ |
| 37 | |
| 38 | static void atmel_start_clock(void) |
| 39 | { |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 40 | if (IS_ENABLED(CONFIG_COMMON_CLK)) { |
| 41 | clk_set_rate(uclk, 48000000); |
| 42 | clk_prepare_enable(uclk); |
| 43 | } |
Boris BREZILLON | cfafb62 | 2013-06-19 13:20:09 +0200 | [diff] [blame] | 44 | clk_prepare_enable(iclk); |
| 45 | clk_prepare_enable(fclk); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 46 | clocked = 1; |
| 47 | } |
| 48 | |
| 49 | static void atmel_stop_clock(void) |
| 50 | { |
Boris BREZILLON | cfafb62 | 2013-06-19 13:20:09 +0200 | [diff] [blame] | 51 | clk_disable_unprepare(fclk); |
| 52 | clk_disable_unprepare(iclk); |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 53 | if (IS_ENABLED(CONFIG_COMMON_CLK)) |
| 54 | clk_disable_unprepare(uclk); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 55 | clocked = 0; |
| 56 | } |
| 57 | |
| 58 | static void atmel_start_ehci(struct platform_device *pdev) |
| 59 | { |
| 60 | dev_dbg(&pdev->dev, "start\n"); |
| 61 | atmel_start_clock(); |
| 62 | } |
| 63 | |
| 64 | static void atmel_stop_ehci(struct platform_device *pdev) |
| 65 | { |
| 66 | dev_dbg(&pdev->dev, "stop\n"); |
| 67 | atmel_stop_clock(); |
| 68 | } |
| 69 | |
| 70 | /*-------------------------------------------------------------------------*/ |
| 71 | |
Bill Pemberton | 41ac7b3 | 2012-11-19 13:21:48 -0500 | [diff] [blame] | 72 | static int ehci_atmel_drv_probe(struct platform_device *pdev) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 73 | { |
| 74 | struct usb_hcd *hcd; |
| 75 | const struct hc_driver *driver = &ehci_atmel_hc_driver; |
| 76 | struct resource *res; |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 77 | struct ehci_hcd *ehci; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 78 | int irq; |
| 79 | int retval; |
| 80 | |
| 81 | if (usb_disabled()) |
| 82 | return -ENODEV; |
| 83 | |
| 84 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); |
| 85 | |
| 86 | irq = platform_get_irq(pdev, 0); |
| 87 | if (irq <= 0) { |
| 88 | dev_err(&pdev->dev, |
| 89 | "Found HC with no IRQ. Check %s setup!\n", |
| 90 | dev_name(&pdev->dev)); |
| 91 | retval = -ENODEV; |
| 92 | goto fail_create_hcd; |
| 93 | } |
| 94 | |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 95 | /* Right now device-tree probed devices don't get dma_mask set. |
| 96 | * Since shared usb code relies on it, set it here for now. |
| 97 | * Once we have dma capability bindings this can go away. |
| 98 | */ |
Russell King | e1fd734 | 2013-06-27 12:36:37 +0100 | [diff] [blame] | 99 | retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
Russell King | 22d9d8e | 2013-06-10 16:28:49 +0100 | [diff] [blame] | 100 | if (retval) |
| 101 | goto fail_create_hcd; |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 102 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 103 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| 104 | if (!hcd) { |
| 105 | retval = -ENOMEM; |
| 106 | goto fail_create_hcd; |
| 107 | } |
| 108 | |
| 109 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 148e113 | 2013-01-21 11:09:22 +0100 | [diff] [blame] | 110 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| 111 | if (IS_ERR(hcd->regs)) { |
| 112 | retval = PTR_ERR(hcd->regs); |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 113 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 114 | } |
| 115 | |
Varka Bhadram | 0fb5f70 | 2014-11-04 07:51:08 +0530 | [diff] [blame] | 116 | hcd->rsrc_start = res->start; |
| 117 | hcd->rsrc_len = resource_size(res); |
| 118 | |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 119 | iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 120 | if (IS_ERR(iclk)) { |
| 121 | dev_err(&pdev->dev, "Error getting interface clock\n"); |
| 122 | retval = -ENOENT; |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 123 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 124 | } |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 125 | fclk = devm_clk_get(&pdev->dev, "uhpck"); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 126 | if (IS_ERR(fclk)) { |
| 127 | dev_err(&pdev->dev, "Error getting function clock\n"); |
| 128 | retval = -ENOENT; |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 129 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 130 | } |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 131 | if (IS_ENABLED(CONFIG_COMMON_CLK)) { |
| 132 | uclk = devm_clk_get(&pdev->dev, "usb_clk"); |
| 133 | if (IS_ERR(uclk)) { |
| 134 | dev_err(&pdev->dev, "failed to get uclk\n"); |
| 135 | retval = PTR_ERR(uclk); |
| 136 | goto fail_request_resource; |
| 137 | } |
| 138 | } |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 139 | |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 140 | ehci = hcd_to_ehci(hcd); |
| 141 | /* registers start at offset 0x0 */ |
| 142 | ehci->caps = hcd->regs; |
| 143 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 144 | atmel_start_ehci(pdev); |
| 145 | |
| 146 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| 147 | if (retval) |
| 148 | goto fail_add_hcd; |
Peter Chen | 3c9740a | 2013-11-05 10:46:02 +0800 | [diff] [blame] | 149 | device_wakeup_enable(hcd->self.controller); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 150 | |
| 151 | return retval; |
| 152 | |
| 153 | fail_add_hcd: |
| 154 | atmel_stop_ehci(pdev); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 155 | fail_request_resource: |
| 156 | usb_put_hcd(hcd); |
| 157 | fail_create_hcd: |
| 158 | dev_err(&pdev->dev, "init %s fail, %d\n", |
| 159 | dev_name(&pdev->dev), retval); |
| 160 | |
| 161 | return retval; |
| 162 | } |
| 163 | |
Bill Pemberton | fb4e98a | 2012-11-19 13:26:20 -0500 | [diff] [blame] | 164 | static int ehci_atmel_drv_remove(struct platform_device *pdev) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 165 | { |
| 166 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 167 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 168 | usb_remove_hcd(hcd); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 169 | usb_put_hcd(hcd); |
| 170 | |
| 171 | atmel_stop_ehci(pdev); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 172 | fclk = iclk = NULL; |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 177 | #ifdef CONFIG_OF |
| 178 | static const struct of_device_id atmel_ehci_dt_ids[] = { |
| 179 | { .compatible = "atmel,at91sam9g45-ehci" }, |
| 180 | { /* sentinel */ } |
| 181 | }; |
| 182 | |
| 183 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); |
| 184 | #endif |
| 185 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 186 | static struct platform_driver ehci_atmel_driver = { |
| 187 | .probe = ehci_atmel_drv_probe, |
Bill Pemberton | 7690417 | 2012-11-19 13:21:08 -0500 | [diff] [blame] | 188 | .remove = ehci_atmel_drv_remove, |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 189 | .shutdown = usb_hcd_platform_shutdown, |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 190 | .driver = { |
| 191 | .name = "atmel-ehci", |
| 192 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), |
| 193 | }, |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 194 | }; |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 195 | |
| 196 | static int __init ehci_atmel_init(void) |
| 197 | { |
| 198 | if (usb_disabled()) |
| 199 | return -ENODEV; |
| 200 | |
| 201 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
| 202 | ehci_init_driver(&ehci_atmel_hc_driver, NULL); |
| 203 | return platform_driver_register(&ehci_atmel_driver); |
| 204 | } |
| 205 | module_init(ehci_atmel_init); |
| 206 | |
| 207 | static void __exit ehci_atmel_cleanup(void) |
| 208 | { |
| 209 | platform_driver_unregister(&ehci_atmel_driver); |
| 210 | } |
| 211 | module_exit(ehci_atmel_cleanup); |
| 212 | |
| 213 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 214 | MODULE_ALIAS("platform:atmel-ehci"); |
| 215 | MODULE_AUTHOR("Nicolas Ferre"); |
| 216 | MODULE_LICENSE("GPL"); |