xref: /openbmc/linux/drivers/usb/host/ehci-atmel.c (revision d0b73b48)
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>
16 #include <linux/of.h>
17 #include <linux/of_platform.h>
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);
56 
57 	/* registers start at offset 0x0 */
58 	ehci->caps = hcd->regs;
59 
60 	return ehci_setup(hcd);
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,
82 	.endpoint_reset		= ehci_endpoint_reset,
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,
94 
95 	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
96 };
97 
98 static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
99 
100 static int ehci_atmel_drv_probe(struct platform_device *pdev)
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 
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 
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;
144 	hcd->rsrc_len = resource_size(res);
145 
146 	hcd->regs = devm_request_and_ioremap(&pdev->dev, res);
147 	if (hcd->regs == NULL) {
148 		dev_dbg(&pdev->dev, "error mapping memory\n");
149 		retval = -EFAULT;
150 		goto fail_request_resource;
151 	}
152 
153 	iclk = devm_clk_get(&pdev->dev, "ehci_clk");
154 	if (IS_ERR(iclk)) {
155 		dev_err(&pdev->dev, "Error getting interface clock\n");
156 		retval = -ENOENT;
157 		goto fail_request_resource;
158 	}
159 	fclk = devm_clk_get(&pdev->dev, "uhpck");
160 	if (IS_ERR(fclk)) {
161 		dev_err(&pdev->dev, "Error getting function clock\n");
162 		retval = -ENOENT;
163 		goto fail_request_resource;
164 	}
165 
166 	atmel_start_ehci(pdev);
167 
168 	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
169 	if (retval)
170 		goto fail_add_hcd;
171 
172 	return retval;
173 
174 fail_add_hcd:
175 	atmel_stop_ehci(pdev);
176 fail_request_resource:
177 	usb_put_hcd(hcd);
178 fail_create_hcd:
179 	dev_err(&pdev->dev, "init %s fail, %d\n",
180 		dev_name(&pdev->dev), retval);
181 
182 	return retval;
183 }
184 
185 static int ehci_atmel_drv_remove(struct platform_device *pdev)
186 {
187 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
188 
189 	ehci_shutdown(hcd);
190 	usb_remove_hcd(hcd);
191 	usb_put_hcd(hcd);
192 
193 	atmel_stop_ehci(pdev);
194 	fclk = iclk = NULL;
195 
196 	return 0;
197 }
198 
199 #ifdef CONFIG_OF
200 static const struct of_device_id atmel_ehci_dt_ids[] = {
201 	{ .compatible = "atmel,at91sam9g45-ehci" },
202 	{ /* sentinel */ }
203 };
204 
205 MODULE_DEVICE_TABLE(of, atmel_ehci_dt_ids);
206 #endif
207 
208 static struct platform_driver ehci_atmel_driver = {
209 	.probe		= ehci_atmel_drv_probe,
210 	.remove		= ehci_atmel_drv_remove,
211 	.shutdown	= usb_hcd_platform_shutdown,
212 	.driver		= {
213 		.name	= "atmel-ehci",
214 		.of_match_table	= of_match_ptr(atmel_ehci_dt_ids),
215 	},
216 };
217