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"; | |
30 | static struct hc_driver __read_mostly ehci_atmel_hc_driver; | |
501c9c08 NF |
31 | |
32 | /* interface and function clocks */ | |
33 | static struct clk *iclk, *fclk; | |
34 | static int clocked; | |
35 | ||
36 | /*-------------------------------------------------------------------------*/ | |
37 | ||
38 | static void atmel_start_clock(void) | |
39 | { | |
cfafb62f BB |
40 | clk_prepare_enable(iclk); |
41 | clk_prepare_enable(fclk); | |
501c9c08 NF |
42 | clocked = 1; |
43 | } | |
44 | ||
45 | static void atmel_stop_clock(void) | |
46 | { | |
cfafb62f BB |
47 | clk_disable_unprepare(fclk); |
48 | clk_disable_unprepare(iclk); | |
501c9c08 NF |
49 | clocked = 0; |
50 | } | |
51 | ||
52 | static void atmel_start_ehci(struct platform_device *pdev) | |
53 | { | |
54 | dev_dbg(&pdev->dev, "start\n"); | |
55 | atmel_start_clock(); | |
56 | } | |
57 | ||
58 | static void atmel_stop_ehci(struct platform_device *pdev) | |
59 | { | |
60 | dev_dbg(&pdev->dev, "stop\n"); | |
61 | atmel_stop_clock(); | |
62 | } | |
63 | ||
64 | /*-------------------------------------------------------------------------*/ | |
65 | ||
41ac7b3a | 66 | static int ehci_atmel_drv_probe(struct platform_device *pdev) |
501c9c08 NF |
67 | { |
68 | struct usb_hcd *hcd; | |
69 | const struct hc_driver *driver = &ehci_atmel_hc_driver; | |
70 | struct resource *res; | |
97736961 | 71 | struct ehci_hcd *ehci; |
501c9c08 NF |
72 | int irq; |
73 | int retval; | |
74 | ||
75 | if (usb_disabled()) | |
76 | return -ENODEV; | |
77 | ||
78 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); | |
79 | ||
80 | irq = platform_get_irq(pdev, 0); | |
81 | if (irq <= 0) { | |
82 | dev_err(&pdev->dev, | |
83 | "Found HC with no IRQ. Check %s setup!\n", | |
84 | dev_name(&pdev->dev)); | |
85 | retval = -ENODEV; | |
86 | goto fail_create_hcd; | |
87 | } | |
88 | ||
9d843003 JCPV |
89 | /* Right now device-tree probed devices don't get dma_mask set. |
90 | * Since shared usb code relies on it, set it here for now. | |
91 | * Once we have dma capability bindings this can go away. | |
92 | */ | |
93 | if (!pdev->dev.dma_mask) | |
3b9561e9 | 94 | pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; |
22d9d8e8 RK |
95 | retval = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); |
96 | if (retval) | |
97 | goto fail_create_hcd; | |
9d843003 | 98 | |
501c9c08 NF |
99 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
100 | if (!hcd) { | |
101 | retval = -ENOMEM; | |
102 | goto fail_create_hcd; | |
103 | } | |
104 | ||
105 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
106 | if (!res) { | |
107 | dev_err(&pdev->dev, | |
108 | "Found HC with no register addr. Check %s setup!\n", | |
109 | dev_name(&pdev->dev)); | |
110 | retval = -ENODEV; | |
111 | goto fail_request_resource; | |
112 | } | |
113 | hcd->rsrc_start = res->start; | |
f65c3540 | 114 | hcd->rsrc_len = resource_size(res); |
501c9c08 | 115 | |
148e1134 TR |
116 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
117 | if (IS_ERR(hcd->regs)) { | |
118 | retval = PTR_ERR(hcd->regs); | |
97983431 | 119 | goto fail_request_resource; |
501c9c08 NF |
120 | } |
121 | ||
97983431 | 122 | iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
501c9c08 NF |
123 | if (IS_ERR(iclk)) { |
124 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
125 | retval = -ENOENT; | |
97983431 | 126 | goto fail_request_resource; |
501c9c08 | 127 | } |
97983431 | 128 | fclk = devm_clk_get(&pdev->dev, "uhpck"); |
501c9c08 NF |
129 | if (IS_ERR(fclk)) { |
130 | dev_err(&pdev->dev, "Error getting function clock\n"); | |
131 | retval = -ENOENT; | |
97983431 | 132 | goto fail_request_resource; |
501c9c08 NF |
133 | } |
134 | ||
97736961 MG |
135 | ehci = hcd_to_ehci(hcd); |
136 | /* registers start at offset 0x0 */ | |
137 | ehci->caps = hcd->regs; | |
138 | ||
501c9c08 NF |
139 | atmel_start_ehci(pdev); |
140 | ||
141 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
142 | if (retval) | |
143 | goto fail_add_hcd; | |
144 | ||
145 | return retval; | |
146 | ||
147 | fail_add_hcd: | |
148 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
149 | fail_request_resource: |
150 | usb_put_hcd(hcd); | |
151 | fail_create_hcd: | |
152 | dev_err(&pdev->dev, "init %s fail, %d\n", | |
153 | dev_name(&pdev->dev), retval); | |
154 | ||
155 | return retval; | |
156 | } | |
157 | ||
fb4e98ab | 158 | static int ehci_atmel_drv_remove(struct platform_device *pdev) |
501c9c08 NF |
159 | { |
160 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
161 | ||
501c9c08 | 162 | usb_remove_hcd(hcd); |
501c9c08 NF |
163 | usb_put_hcd(hcd); |
164 | ||
165 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
166 | fclk = iclk = NULL; |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
9d843003 JCPV |
171 | #ifdef CONFIG_OF |
172 | static const struct of_device_id atmel_ehci_dt_ids[] = { | |
173 | { .compatible = "atmel,at91sam9g45-ehci" }, | |
174 | { /* sentinel */ } | |
175 | }; | |
176 | ||
177 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); | |
178 | #endif | |
179 | ||
501c9c08 NF |
180 | static struct platform_driver ehci_atmel_driver = { |
181 | .probe = ehci_atmel_drv_probe, | |
7690417d | 182 | .remove = ehci_atmel_drv_remove, |
501c9c08 | 183 | .shutdown = usb_hcd_platform_shutdown, |
9d843003 JCPV |
184 | .driver = { |
185 | .name = "atmel-ehci", | |
186 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), | |
187 | }, | |
501c9c08 | 188 | }; |
97736961 MG |
189 | |
190 | static int __init ehci_atmel_init(void) | |
191 | { | |
192 | if (usb_disabled()) | |
193 | return -ENODEV; | |
194 | ||
195 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
196 | ehci_init_driver(&ehci_atmel_hc_driver, NULL); | |
197 | return platform_driver_register(&ehci_atmel_driver); | |
198 | } | |
199 | module_init(ehci_atmel_init); | |
200 | ||
201 | static void __exit ehci_atmel_cleanup(void) | |
202 | { | |
203 | platform_driver_unregister(&ehci_atmel_driver); | |
204 | } | |
205 | module_exit(ehci_atmel_cleanup); | |
206 | ||
207 | MODULE_DESCRIPTION(DRIVER_DESC); | |
208 | MODULE_ALIAS("platform:atmel-ehci"); | |
209 | MODULE_AUTHOR("Nicolas Ferre"); | |
210 | MODULE_LICENSE("GPL"); |