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"; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 30 | |
| 31 | /* interface and function clocks */ |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 32 | #define hcd_to_atmel_ehci_priv(h) \ |
| 33 | ((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv) |
| 34 | |
| 35 | struct atmel_ehci_priv { |
| 36 | struct clk *iclk; |
| 37 | struct clk *fclk; |
| 38 | struct clk *uclk; |
| 39 | bool clocked; |
| 40 | }; |
| 41 | |
| 42 | static struct hc_driver __read_mostly ehci_atmel_hc_driver; |
| 43 | |
| 44 | static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = { |
| 45 | .extra_priv_size = sizeof(struct atmel_ehci_priv), |
| 46 | }; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 47 | |
| 48 | /*-------------------------------------------------------------------------*/ |
| 49 | |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 50 | static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 51 | { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 52 | if (atmel_ehci->clocked) |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 53 | return; |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 54 | if (IS_ENABLED(CONFIG_COMMON_CLK)) { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 55 | clk_set_rate(atmel_ehci->uclk, 48000000); |
| 56 | clk_prepare_enable(atmel_ehci->uclk); |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 57 | } |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 58 | clk_prepare_enable(atmel_ehci->iclk); |
| 59 | clk_prepare_enable(atmel_ehci->fclk); |
| 60 | atmel_ehci->clocked = true; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 63 | static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 64 | { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 65 | if (!atmel_ehci->clocked) |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 66 | return; |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 67 | clk_disable_unprepare(atmel_ehci->fclk); |
| 68 | clk_disable_unprepare(atmel_ehci->iclk); |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 69 | if (IS_ENABLED(CONFIG_COMMON_CLK)) |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 70 | clk_disable_unprepare(atmel_ehci->uclk); |
| 71 | atmel_ehci->clocked = false; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static void atmel_start_ehci(struct platform_device *pdev) |
| 75 | { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 76 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 77 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
| 78 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 79 | dev_dbg(&pdev->dev, "start\n"); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 80 | atmel_start_clock(atmel_ehci); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | static void atmel_stop_ehci(struct platform_device *pdev) |
| 84 | { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 85 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 86 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
| 87 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 88 | dev_dbg(&pdev->dev, "stop\n"); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 89 | atmel_stop_clock(atmel_ehci); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | /*-------------------------------------------------------------------------*/ |
| 93 | |
Bill Pemberton | 41ac7b3 | 2012-11-19 13:21:48 -0500 | [diff] [blame] | 94 | static int ehci_atmel_drv_probe(struct platform_device *pdev) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 95 | { |
| 96 | struct usb_hcd *hcd; |
| 97 | const struct hc_driver *driver = &ehci_atmel_hc_driver; |
| 98 | struct resource *res; |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 99 | struct ehci_hcd *ehci; |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 100 | struct atmel_ehci_priv *atmel_ehci; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 101 | int irq; |
| 102 | int retval; |
| 103 | |
| 104 | if (usb_disabled()) |
| 105 | return -ENODEV; |
| 106 | |
| 107 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); |
| 108 | |
| 109 | irq = platform_get_irq(pdev, 0); |
| 110 | if (irq <= 0) { |
| 111 | dev_err(&pdev->dev, |
| 112 | "Found HC with no IRQ. Check %s setup!\n", |
| 113 | dev_name(&pdev->dev)); |
| 114 | retval = -ENODEV; |
| 115 | goto fail_create_hcd; |
| 116 | } |
| 117 | |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 118 | /* Right now device-tree probed devices don't get dma_mask set. |
| 119 | * Since shared usb code relies on it, set it here for now. |
| 120 | * Once we have dma capability bindings this can go away. |
| 121 | */ |
Russell King | e1fd734 | 2013-06-27 12:36:37 +0100 | [diff] [blame] | 122 | retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
Russell King | 22d9d8e | 2013-06-10 16:28:49 +0100 | [diff] [blame] | 123 | if (retval) |
| 124 | goto fail_create_hcd; |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 125 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 126 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
| 127 | if (!hcd) { |
| 128 | retval = -ENOMEM; |
| 129 | goto fail_create_hcd; |
| 130 | } |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 131 | atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 132 | |
| 133 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Thierry Reding | 148e113 | 2013-01-21 11:09:22 +0100 | [diff] [blame] | 134 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
| 135 | if (IS_ERR(hcd->regs)) { |
| 136 | retval = PTR_ERR(hcd->regs); |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 137 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Varka Bhadram | 0fb5f70 | 2014-11-04 07:51:08 +0530 | [diff] [blame] | 140 | hcd->rsrc_start = res->start; |
| 141 | hcd->rsrc_len = resource_size(res); |
| 142 | |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 143 | atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
| 144 | if (IS_ERR(atmel_ehci->iclk)) { |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 145 | dev_err(&pdev->dev, "Error getting interface clock\n"); |
| 146 | retval = -ENOENT; |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 147 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 148 | } |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 149 | atmel_ehci->fclk = devm_clk_get(&pdev->dev, "uhpck"); |
| 150 | if (IS_ERR(atmel_ehci->fclk)) { |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 151 | dev_err(&pdev->dev, "Error getting function clock\n"); |
| 152 | retval = -ENOENT; |
Julia Lawall | 9798343 | 2012-07-29 21:46:05 +0200 | [diff] [blame] | 153 | goto fail_request_resource; |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 154 | } |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 155 | if (IS_ENABLED(CONFIG_COMMON_CLK)) { |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 156 | atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk"); |
| 157 | if (IS_ERR(atmel_ehci->uclk)) { |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 158 | dev_err(&pdev->dev, "failed to get uclk\n"); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 159 | retval = PTR_ERR(atmel_ehci->uclk); |
Boris BREZILLON | 0d768fcf | 2013-10-18 21:26:51 +0200 | [diff] [blame] | 160 | goto fail_request_resource; |
| 161 | } |
| 162 | } |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 163 | |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 164 | ehci = hcd_to_ehci(hcd); |
| 165 | /* registers start at offset 0x0 */ |
| 166 | ehci->caps = hcd->regs; |
| 167 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 168 | atmel_start_ehci(pdev); |
| 169 | |
| 170 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); |
| 171 | if (retval) |
| 172 | goto fail_add_hcd; |
Peter Chen | 3c9740a | 2013-11-05 10:46:02 +0800 | [diff] [blame] | 173 | device_wakeup_enable(hcd->self.controller); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 174 | |
| 175 | return retval; |
| 176 | |
| 177 | fail_add_hcd: |
| 178 | atmel_stop_ehci(pdev); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 179 | fail_request_resource: |
| 180 | usb_put_hcd(hcd); |
| 181 | fail_create_hcd: |
| 182 | dev_err(&pdev->dev, "init %s fail, %d\n", |
| 183 | dev_name(&pdev->dev), retval); |
| 184 | |
| 185 | return retval; |
| 186 | } |
| 187 | |
Bill Pemberton | fb4e98a | 2012-11-19 13:26:20 -0500 | [diff] [blame] | 188 | static int ehci_atmel_drv_remove(struct platform_device *pdev) |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 189 | { |
| 190 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
| 191 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 192 | usb_remove_hcd(hcd); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 193 | usb_put_hcd(hcd); |
| 194 | |
| 195 | atmel_stop_ehci(pdev); |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 200 | #ifdef CONFIG_PM |
| 201 | static int ehci_atmel_drv_suspend(struct device *dev) |
| 202 | { |
| 203 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 204 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 205 | int ret; |
| 206 | |
| 207 | ret = ehci_suspend(hcd, false); |
| 208 | if (ret) |
| 209 | return ret; |
| 210 | |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 211 | atmel_stop_clock(atmel_ehci); |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static int ehci_atmel_drv_resume(struct device *dev) |
| 216 | { |
| 217 | struct usb_hcd *hcd = dev_get_drvdata(dev); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 218 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 219 | |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 220 | atmel_start_clock(atmel_ehci); |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 221 | return ehci_resume(hcd, false); |
| 222 | } |
| 223 | #endif |
| 224 | |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 225 | #ifdef CONFIG_OF |
| 226 | static const struct of_device_id atmel_ehci_dt_ids[] = { |
| 227 | { .compatible = "atmel,at91sam9g45-ehci" }, |
| 228 | { /* sentinel */ } |
| 229 | }; |
| 230 | |
| 231 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); |
| 232 | #endif |
| 233 | |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 234 | static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend, |
| 235 | ehci_atmel_drv_resume); |
| 236 | |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 237 | static struct platform_driver ehci_atmel_driver = { |
| 238 | .probe = ehci_atmel_drv_probe, |
Bill Pemberton | 7690417 | 2012-11-19 13:21:08 -0500 | [diff] [blame] | 239 | .remove = ehci_atmel_drv_remove, |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 240 | .shutdown = usb_hcd_platform_shutdown, |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 241 | .driver = { |
| 242 | .name = "atmel-ehci", |
Sylvain Rochet | ca2c1dc | 2015-01-20 14:38:59 +0100 | [diff] [blame] | 243 | .pm = &ehci_atmel_pm_ops, |
Jean-Christophe PLAGNIOL-VILLARD | 9d84300 | 2011-11-22 12:11:13 +0800 | [diff] [blame] | 244 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), |
| 245 | }, |
Nicolas Ferre | 501c9c0 | 2009-07-27 14:47:40 -0700 | [diff] [blame] | 246 | }; |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 247 | |
| 248 | static int __init ehci_atmel_init(void) |
| 249 | { |
| 250 | if (usb_disabled()) |
| 251 | return -ENODEV; |
| 252 | |
| 253 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); |
Sylvain Rochet | 7baddac | 2015-01-20 14:39:01 +0100 | [diff] [blame] | 254 | ehci_init_driver(&ehci_atmel_hc_driver, &ehci_atmel_drv_overrides); |
Manjunath Goudar | 9773696 | 2013-04-02 18:24:02 +0200 | [diff] [blame] | 255 | return platform_driver_register(&ehci_atmel_driver); |
| 256 | } |
| 257 | module_init(ehci_atmel_init); |
| 258 | |
| 259 | static void __exit ehci_atmel_cleanup(void) |
| 260 | { |
| 261 | platform_driver_unregister(&ehci_atmel_driver); |
| 262 | } |
| 263 | module_exit(ehci_atmel_cleanup); |
| 264 | |
| 265 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 266 | MODULE_ALIAS("platform:atmel-ehci"); |
| 267 | MODULE_AUTHOR("Nicolas Ferre"); |
| 268 | MODULE_LICENSE("GPL"); |