1 /*
2 * Copyright 2008 Cavium Networks
3 *
4 * This file is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, Version 2, as
6 * published by the Free Software Foundation.
7 */
8
9 #include <linux/platform_device.h>
10 #include <linux/atomic.h>
11 #include <mach/cns3xxx.h>
12 #include <mach/pm.h>
13
14 static int __devinit
cns3xxx_ohci_start(struct usb_hcd * hcd)15 cns3xxx_ohci_start(struct usb_hcd *hcd)
16 {
17 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
18 int ret;
19
20 /*
21 * EHCI and OHCI share the same clock and power,
22 * resetting twice would cause the 1st controller been reset.
23 * Therefore only do power up at the first up device, and
24 * power down at the last down device.
25 *
26 * Set USB AHB INCR length to 16
27 */
28 if (atomic_inc_return(&usb_pwr_ref) == 1) {
29 cns3xxx_pwr_power_up(1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_PLL_USB);
30 cns3xxx_pwr_clk_en(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
31 cns3xxx_pwr_soft_rst(1 << PM_SOFT_RST_REG_OFFST_USB_HOST);
32 __raw_writel((__raw_readl(MISC_CHIP_CONFIG_REG) | (0X2 << 24)),
33 MISC_CHIP_CONFIG_REG);
34 }
35
36 ret = ohci_init(ohci);
37 if (ret < 0)
38 return ret;
39
40 ohci->num_ports = 1;
41
42 ret = ohci_run(ohci);
43 if (ret < 0) {
44 err("can't start %s", hcd->self.bus_name);
45 ohci_stop(hcd);
46 return ret;
47 }
48 return 0;
49 }
50
51 static const struct hc_driver cns3xxx_ohci_hc_driver = {
52 .description = hcd_name,
53 .product_desc = "CNS3XXX OHCI Host controller",
54 .hcd_priv_size = sizeof(struct ohci_hcd),
55 .irq = ohci_irq,
56 .flags = HCD_USB11 | HCD_MEMORY,
57 .start = cns3xxx_ohci_start,
58 .stop = ohci_stop,
59 .shutdown = ohci_shutdown,
60 .urb_enqueue = ohci_urb_enqueue,
61 .urb_dequeue = ohci_urb_dequeue,
62 .endpoint_disable = ohci_endpoint_disable,
63 .get_frame_number = ohci_get_frame,
64 .hub_status_data = ohci_hub_status_data,
65 .hub_control = ohci_hub_control,
66 #ifdef CONFIG_PM
67 .bus_suspend = ohci_bus_suspend,
68 .bus_resume = ohci_bus_resume,
69 #endif
70 .start_port_reset = ohci_start_port_reset,
71 };
72
cns3xxx_ohci_probe(struct platform_device * pdev)73 static int cns3xxx_ohci_probe(struct platform_device *pdev)
74 {
75 struct device *dev = &pdev->dev;
76 struct usb_hcd *hcd;
77 const struct hc_driver *driver = &cns3xxx_ohci_hc_driver;
78 struct resource *res;
79 int irq;
80 int retval;
81
82 if (usb_disabled())
83 return -ENODEV;
84
85 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
86 if (!res) {
87 dev_err(dev, "Found HC with no IRQ.\n");
88 return -ENODEV;
89 }
90 irq = res->start;
91
92 hcd = usb_create_hcd(driver, dev, dev_name(dev));
93 if (!hcd)
94 return -ENOMEM;
95
96 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
97 if (!res) {
98 dev_err(dev, "Found HC with no register addr.\n");
99 retval = -ENODEV;
100 goto err1;
101 }
102 hcd->rsrc_start = res->start;
103 hcd->rsrc_len = resource_size(res);
104
105 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
106 driver->description)) {
107 dev_dbg(dev, "controller already in use\n");
108 retval = -EBUSY;
109 goto err1;
110 }
111
112 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
113 if (!hcd->regs) {
114 dev_dbg(dev, "error mapping memory\n");
115 retval = -EFAULT;
116 goto err2;
117 }
118
119 ohci_hcd_init(hcd_to_ohci(hcd));
120
121 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
122 if (retval == 0)
123 return retval;
124
125 iounmap(hcd->regs);
126 err2:
127 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
128 err1:
129 usb_put_hcd(hcd);
130 return retval;
131 }
132
cns3xxx_ohci_remove(struct platform_device * pdev)133 static int cns3xxx_ohci_remove(struct platform_device *pdev)
134 {
135 struct usb_hcd *hcd = platform_get_drvdata(pdev);
136
137 usb_remove_hcd(hcd);
138 iounmap(hcd->regs);
139 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
140
141 /*
142 * EHCI and OHCI share the same clock and power,
143 * resetting twice would cause the 1st controller been reset.
144 * Therefore only do power up at the first up device, and
145 * power down at the last down device.
146 */
147 if (atomic_dec_return(&usb_pwr_ref) == 0)
148 cns3xxx_pwr_clk_dis(1 << PM_CLK_GATE_REG_OFFSET_USB_HOST);
149
150 usb_put_hcd(hcd);
151
152 platform_set_drvdata(pdev, NULL);
153
154 return 0;
155 }
156
157 MODULE_ALIAS("platform:cns3xxx-ohci");
158
159 static struct platform_driver ohci_hcd_cns3xxx_driver = {
160 .probe = cns3xxx_ohci_probe,
161 .remove = cns3xxx_ohci_remove,
162 .driver = {
163 .name = "cns3xxx-ohci",
164 },
165 };
166