Commit | Line | Data |
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501c9c08 NF |
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> | |
97736961 MG |
15 | #include <linux/dma-mapping.h> |
16 | #include <linux/io.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
9475375a | 19 | #include <linux/of.h> |
9d843003 | 20 | #include <linux/of_platform.h> |
97736961 MG |
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"; | |
501c9c08 NF |
30 | |
31 | /* interface and function clocks */ | |
7baddacb SR |
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; | |
7baddacb SR |
37 | struct clk *uclk; |
38 | bool clocked; | |
39 | }; | |
40 | ||
41 | static struct hc_driver __read_mostly ehci_atmel_hc_driver; | |
42 | ||
43 | static const struct ehci_driver_overrides ehci_atmel_drv_overrides __initconst = { | |
44 | .extra_priv_size = sizeof(struct atmel_ehci_priv), | |
45 | }; | |
501c9c08 NF |
46 | |
47 | /*-------------------------------------------------------------------------*/ | |
48 | ||
7baddacb | 49 | static void atmel_start_clock(struct atmel_ehci_priv *atmel_ehci) |
501c9c08 | 50 | { |
7baddacb | 51 | if (atmel_ehci->clocked) |
ca2c1dc0 | 52 | return; |
e32643a7 BB |
53 | |
54 | clk_prepare_enable(atmel_ehci->uclk); | |
7baddacb | 55 | clk_prepare_enable(atmel_ehci->iclk); |
7baddacb | 56 | atmel_ehci->clocked = true; |
501c9c08 NF |
57 | } |
58 | ||
7baddacb | 59 | static void atmel_stop_clock(struct atmel_ehci_priv *atmel_ehci) |
501c9c08 | 60 | { |
7baddacb | 61 | if (!atmel_ehci->clocked) |
ca2c1dc0 | 62 | return; |
e32643a7 | 63 | |
7baddacb | 64 | clk_disable_unprepare(atmel_ehci->iclk); |
e32643a7 | 65 | clk_disable_unprepare(atmel_ehci->uclk); |
7baddacb | 66 | atmel_ehci->clocked = false; |
501c9c08 NF |
67 | } |
68 | ||
69 | static void atmel_start_ehci(struct platform_device *pdev) | |
70 | { | |
7baddacb SR |
71 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
72 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); | |
73 | ||
501c9c08 | 74 | dev_dbg(&pdev->dev, "start\n"); |
7baddacb | 75 | atmel_start_clock(atmel_ehci); |
501c9c08 NF |
76 | } |
77 | ||
78 | static void atmel_stop_ehci(struct platform_device *pdev) | |
79 | { | |
7baddacb SR |
80 | struct usb_hcd *hcd = platform_get_drvdata(pdev); |
81 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); | |
82 | ||
501c9c08 | 83 | dev_dbg(&pdev->dev, "stop\n"); |
7baddacb | 84 | atmel_stop_clock(atmel_ehci); |
501c9c08 NF |
85 | } |
86 | ||
87 | /*-------------------------------------------------------------------------*/ | |
88 | ||
41ac7b3a | 89 | static int ehci_atmel_drv_probe(struct platform_device *pdev) |
501c9c08 NF |
90 | { |
91 | struct usb_hcd *hcd; | |
92 | const struct hc_driver *driver = &ehci_atmel_hc_driver; | |
93 | struct resource *res; | |
97736961 | 94 | struct ehci_hcd *ehci; |
7baddacb | 95 | struct atmel_ehci_priv *atmel_ehci; |
501c9c08 NF |
96 | int irq; |
97 | int retval; | |
98 | ||
99 | if (usb_disabled()) | |
100 | return -ENODEV; | |
101 | ||
102 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); | |
103 | ||
104 | irq = platform_get_irq(pdev, 0); | |
105 | if (irq <= 0) { | |
106 | dev_err(&pdev->dev, | |
107 | "Found HC with no IRQ. Check %s setup!\n", | |
108 | dev_name(&pdev->dev)); | |
109 | retval = -ENODEV; | |
110 | goto fail_create_hcd; | |
111 | } | |
112 | ||
9d843003 JCPV |
113 | /* Right now device-tree probed devices don't get dma_mask set. |
114 | * Since shared usb code relies on it, set it here for now. | |
115 | * Once we have dma capability bindings this can go away. | |
116 | */ | |
e1fd7341 | 117 | retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
22d9d8e8 RK |
118 | if (retval) |
119 | goto fail_create_hcd; | |
9d843003 | 120 | |
501c9c08 NF |
121 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
122 | if (!hcd) { | |
123 | retval = -ENOMEM; | |
124 | goto fail_create_hcd; | |
125 | } | |
7baddacb | 126 | atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
501c9c08 NF |
127 | |
128 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
148e1134 TR |
129 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
130 | if (IS_ERR(hcd->regs)) { | |
131 | retval = PTR_ERR(hcd->regs); | |
97983431 | 132 | goto fail_request_resource; |
501c9c08 NF |
133 | } |
134 | ||
0fb5f700 VB |
135 | hcd->rsrc_start = res->start; |
136 | hcd->rsrc_len = resource_size(res); | |
137 | ||
7baddacb SR |
138 | atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
139 | if (IS_ERR(atmel_ehci->iclk)) { | |
501c9c08 NF |
140 | dev_err(&pdev->dev, "Error getting interface clock\n"); |
141 | retval = -ENOENT; | |
97983431 | 142 | goto fail_request_resource; |
501c9c08 | 143 | } |
e32643a7 BB |
144 | |
145 | atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk"); | |
146 | if (IS_ERR(atmel_ehci->uclk)) { | |
147 | dev_err(&pdev->dev, "failed to get uclk\n"); | |
148 | retval = PTR_ERR(atmel_ehci->uclk); | |
97983431 | 149 | goto fail_request_resource; |
501c9c08 NF |
150 | } |
151 | ||
97736961 MG |
152 | ehci = hcd_to_ehci(hcd); |
153 | /* registers start at offset 0x0 */ | |
154 | ehci->caps = hcd->regs; | |
155 | ||
501c9c08 NF |
156 | atmel_start_ehci(pdev); |
157 | ||
158 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
159 | if (retval) | |
160 | goto fail_add_hcd; | |
3c9740a1 | 161 | device_wakeup_enable(hcd->self.controller); |
501c9c08 NF |
162 | |
163 | return retval; | |
164 | ||
165 | fail_add_hcd: | |
166 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
167 | fail_request_resource: |
168 | usb_put_hcd(hcd); | |
169 | fail_create_hcd: | |
170 | dev_err(&pdev->dev, "init %s fail, %d\n", | |
171 | dev_name(&pdev->dev), retval); | |
172 | ||
173 | return retval; | |
174 | } | |
175 | ||
fb4e98ab | 176 | static int ehci_atmel_drv_remove(struct platform_device *pdev) |
501c9c08 NF |
177 | { |
178 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
179 | ||
501c9c08 | 180 | usb_remove_hcd(hcd); |
501c9c08 NF |
181 | usb_put_hcd(hcd); |
182 | ||
183 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
184 | |
185 | return 0; | |
186 | } | |
187 | ||
ca2c1dc0 SR |
188 | #ifdef CONFIG_PM |
189 | static int ehci_atmel_drv_suspend(struct device *dev) | |
190 | { | |
191 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
7baddacb | 192 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
ca2c1dc0 SR |
193 | int ret; |
194 | ||
195 | ret = ehci_suspend(hcd, false); | |
196 | if (ret) | |
197 | return ret; | |
198 | ||
7baddacb | 199 | atmel_stop_clock(atmel_ehci); |
ca2c1dc0 SR |
200 | return 0; |
201 | } | |
202 | ||
203 | static int ehci_atmel_drv_resume(struct device *dev) | |
204 | { | |
205 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
7baddacb | 206 | struct atmel_ehci_priv *atmel_ehci = hcd_to_atmel_ehci_priv(hcd); |
ca2c1dc0 | 207 | |
7baddacb | 208 | atmel_start_clock(atmel_ehci); |
ca2c1dc0 SR |
209 | return ehci_resume(hcd, false); |
210 | } | |
211 | #endif | |
212 | ||
9d843003 JCPV |
213 | #ifdef CONFIG_OF |
214 | static const struct of_device_id atmel_ehci_dt_ids[] = { | |
215 | { .compatible = "atmel,at91sam9g45-ehci" }, | |
216 | { /* sentinel */ } | |
217 | }; | |
218 | ||
219 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); | |
220 | #endif | |
221 | ||
ca2c1dc0 SR |
222 | static SIMPLE_DEV_PM_OPS(ehci_atmel_pm_ops, ehci_atmel_drv_suspend, |
223 | ehci_atmel_drv_resume); | |
224 | ||
501c9c08 NF |
225 | static struct platform_driver ehci_atmel_driver = { |
226 | .probe = ehci_atmel_drv_probe, | |
7690417d | 227 | .remove = ehci_atmel_drv_remove, |
501c9c08 | 228 | .shutdown = usb_hcd_platform_shutdown, |
9d843003 JCPV |
229 | .driver = { |
230 | .name = "atmel-ehci", | |
ca2c1dc0 | 231 | .pm = &ehci_atmel_pm_ops, |
9d843003 JCPV |
232 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), |
233 | }, | |
501c9c08 | 234 | }; |
97736961 MG |
235 | |
236 | static int __init ehci_atmel_init(void) | |
237 | { | |
238 | if (usb_disabled()) | |
239 | return -ENODEV; | |
240 | ||
241 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
7baddacb | 242 | ehci_init_driver(&ehci_atmel_hc_driver, &ehci_atmel_drv_overrides); |
97736961 MG |
243 | return platform_driver_register(&ehci_atmel_driver); |
244 | } | |
245 | module_init(ehci_atmel_init); | |
246 | ||
247 | static void __exit ehci_atmel_cleanup(void) | |
248 | { | |
249 | platform_driver_unregister(&ehci_atmel_driver); | |
250 | } | |
251 | module_exit(ehci_atmel_cleanup); | |
252 | ||
253 | MODULE_DESCRIPTION(DRIVER_DESC); | |
254 | MODULE_ALIAS("platform:atmel-ehci"); | |
255 | MODULE_AUTHOR("Nicolas Ferre"); | |
256 | MODULE_LICENSE("GPL"); |