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760efe69 ML |
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 | |
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 | ||
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 = res->end - res->start + 1; | |
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 | ||
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 | }; |