Commit | Line | Data |
---|---|---|
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> | |
15 | #include <linux/platform_device.h> | |
9475375a | 16 | #include <linux/of.h> |
9d843003 | 17 | #include <linux/of_platform.h> |
501c9c08 NF |
18 | |
19 | /* interface and function clocks */ | |
20 | static struct clk *iclk, *fclk; | |
21 | static int clocked; | |
22 | ||
23 | /*-------------------------------------------------------------------------*/ | |
24 | ||
25 | static void atmel_start_clock(void) | |
26 | { | |
27 | clk_enable(iclk); | |
28 | clk_enable(fclk); | |
29 | clocked = 1; | |
30 | } | |
31 | ||
32 | static void atmel_stop_clock(void) | |
33 | { | |
34 | clk_disable(fclk); | |
35 | clk_disable(iclk); | |
36 | clocked = 0; | |
37 | } | |
38 | ||
39 | static void atmel_start_ehci(struct platform_device *pdev) | |
40 | { | |
41 | dev_dbg(&pdev->dev, "start\n"); | |
42 | atmel_start_clock(); | |
43 | } | |
44 | ||
45 | static void atmel_stop_ehci(struct platform_device *pdev) | |
46 | { | |
47 | dev_dbg(&pdev->dev, "stop\n"); | |
48 | atmel_stop_clock(); | |
49 | } | |
50 | ||
51 | /*-------------------------------------------------------------------------*/ | |
52 | ||
53 | static int ehci_atmel_setup(struct usb_hcd *hcd) | |
54 | { | |
55 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
501c9c08 NF |
56 | |
57 | /* registers start at offset 0x0 */ | |
58 | ehci->caps = hcd->regs; | |
501c9c08 | 59 | |
c73cee71 | 60 | return ehci_setup(hcd); |
501c9c08 NF |
61 | } |
62 | ||
63 | static const struct hc_driver ehci_atmel_hc_driver = { | |
64 | .description = hcd_name, | |
65 | .product_desc = "Atmel EHCI UHP HS", | |
66 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
67 | ||
68 | /* generic hardware linkage */ | |
69 | .irq = ehci_irq, | |
70 | .flags = HCD_MEMORY | HCD_USB2, | |
71 | ||
72 | /* basic lifecycle operations */ | |
73 | .reset = ehci_atmel_setup, | |
74 | .start = ehci_run, | |
75 | .stop = ehci_stop, | |
76 | .shutdown = ehci_shutdown, | |
77 | ||
78 | /* managing i/o requests and associated device resources */ | |
79 | .urb_enqueue = ehci_urb_enqueue, | |
80 | .urb_dequeue = ehci_urb_dequeue, | |
81 | .endpoint_disable = ehci_endpoint_disable, | |
b48d7f50 | 82 | .endpoint_reset = ehci_endpoint_reset, |
501c9c08 NF |
83 | |
84 | /* scheduling support */ | |
85 | .get_frame_number = ehci_get_frame, | |
86 | ||
87 | /* root hub support */ | |
88 | .hub_status_data = ehci_hub_status_data, | |
89 | .hub_control = ehci_hub_control, | |
90 | .bus_suspend = ehci_bus_suspend, | |
91 | .bus_resume = ehci_bus_resume, | |
92 | .relinquish_port = ehci_relinquish_port, | |
93 | .port_handed_over = ehci_port_handed_over, | |
b48d7f50 PM |
94 | |
95 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
501c9c08 NF |
96 | }; |
97 | ||
9d843003 JCPV |
98 | static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32); |
99 | ||
41ac7b3a | 100 | static int ehci_atmel_drv_probe(struct platform_device *pdev) |
501c9c08 NF |
101 | { |
102 | struct usb_hcd *hcd; | |
103 | const struct hc_driver *driver = &ehci_atmel_hc_driver; | |
104 | struct resource *res; | |
105 | int irq; | |
106 | int retval; | |
107 | ||
108 | if (usb_disabled()) | |
109 | return -ENODEV; | |
110 | ||
111 | pr_debug("Initializing Atmel-SoC USB Host Controller\n"); | |
112 | ||
113 | irq = platform_get_irq(pdev, 0); | |
114 | if (irq <= 0) { | |
115 | dev_err(&pdev->dev, | |
116 | "Found HC with no IRQ. Check %s setup!\n", | |
117 | dev_name(&pdev->dev)); | |
118 | retval = -ENODEV; | |
119 | goto fail_create_hcd; | |
120 | } | |
121 | ||
9d843003 JCPV |
122 | /* Right now device-tree probed devices don't get dma_mask set. |
123 | * Since shared usb code relies on it, set it here for now. | |
124 | * Once we have dma capability bindings this can go away. | |
125 | */ | |
126 | if (!pdev->dev.dma_mask) | |
127 | pdev->dev.dma_mask = &at91_ehci_dma_mask; | |
128 | ||
501c9c08 NF |
129 | hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); |
130 | if (!hcd) { | |
131 | retval = -ENOMEM; | |
132 | goto fail_create_hcd; | |
133 | } | |
134 | ||
135 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
136 | if (!res) { | |
137 | dev_err(&pdev->dev, | |
138 | "Found HC with no register addr. Check %s setup!\n", | |
139 | dev_name(&pdev->dev)); | |
140 | retval = -ENODEV; | |
141 | goto fail_request_resource; | |
142 | } | |
143 | hcd->rsrc_start = res->start; | |
f65c3540 | 144 | hcd->rsrc_len = resource_size(res); |
501c9c08 | 145 | |
148e1134 TR |
146 | hcd->regs = devm_ioremap_resource(&pdev->dev, res); |
147 | if (IS_ERR(hcd->regs)) { | |
148 | retval = PTR_ERR(hcd->regs); | |
97983431 | 149 | goto fail_request_resource; |
501c9c08 NF |
150 | } |
151 | ||
97983431 | 152 | iclk = devm_clk_get(&pdev->dev, "ehci_clk"); |
501c9c08 NF |
153 | if (IS_ERR(iclk)) { |
154 | dev_err(&pdev->dev, "Error getting interface clock\n"); | |
155 | retval = -ENOENT; | |
97983431 | 156 | goto fail_request_resource; |
501c9c08 | 157 | } |
97983431 | 158 | fclk = devm_clk_get(&pdev->dev, "uhpck"); |
501c9c08 NF |
159 | if (IS_ERR(fclk)) { |
160 | dev_err(&pdev->dev, "Error getting function clock\n"); | |
161 | retval = -ENOENT; | |
97983431 | 162 | goto fail_request_resource; |
501c9c08 NF |
163 | } |
164 | ||
165 | atmel_start_ehci(pdev); | |
166 | ||
167 | retval = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
168 | if (retval) | |
169 | goto fail_add_hcd; | |
170 | ||
171 | return retval; | |
172 | ||
173 | fail_add_hcd: | |
174 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
175 | fail_request_resource: |
176 | usb_put_hcd(hcd); | |
177 | fail_create_hcd: | |
178 | dev_err(&pdev->dev, "init %s fail, %d\n", | |
179 | dev_name(&pdev->dev), retval); | |
180 | ||
181 | return retval; | |
182 | } | |
183 | ||
fb4e98ab | 184 | static int ehci_atmel_drv_remove(struct platform_device *pdev) |
501c9c08 NF |
185 | { |
186 | struct usb_hcd *hcd = platform_get_drvdata(pdev); | |
187 | ||
188 | ehci_shutdown(hcd); | |
189 | usb_remove_hcd(hcd); | |
501c9c08 NF |
190 | usb_put_hcd(hcd); |
191 | ||
192 | atmel_stop_ehci(pdev); | |
501c9c08 NF |
193 | fclk = iclk = NULL; |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
9d843003 JCPV |
198 | #ifdef CONFIG_OF |
199 | static const struct of_device_id atmel_ehci_dt_ids[] = { | |
200 | { .compatible = "atmel,at91sam9g45-ehci" }, | |
201 | { /* sentinel */ } | |
202 | }; | |
203 | ||
204 | MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids); | |
205 | #endif | |
206 | ||
501c9c08 NF |
207 | static struct platform_driver ehci_atmel_driver = { |
208 | .probe = ehci_atmel_drv_probe, | |
7690417d | 209 | .remove = ehci_atmel_drv_remove, |
501c9c08 | 210 | .shutdown = usb_hcd_platform_shutdown, |
9d843003 JCPV |
211 | .driver = { |
212 | .name = "atmel-ehci", | |
213 | .of_match_table = of_match_ptr(atmel_ehci_dt_ids), | |
214 | }, | |
501c9c08 | 215 | }; |