]>
Commit | Line | Data |
---|---|---|
1789e52a KM |
1 | /* |
2 | * Renesas R-Car USB phy driver | |
3 | * | |
4 | * Copyright (C) 2012 Renesas Solutions Corp. | |
5 | * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/delay.h> | |
13 | #include <linux/io.h> | |
14 | #include <linux/usb/otg.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/module.h> | |
18 | ||
19 | /* USBH common register */ | |
20 | #define USBPCTRL0 0x0800 | |
21 | #define USBPCTRL1 0x0804 | |
22 | #define USBST 0x0808 | |
23 | #define USBEH0 0x080C | |
24 | #define USBOH0 0x081C | |
25 | #define USBCTL0 0x0858 | |
26 | #define EIIBC1 0x0094 | |
27 | #define EIIBC2 0x009C | |
28 | ||
29 | /* USBPCTRL1 */ | |
30 | #define PHY_RST (1 << 2) | |
31 | #define PLL_ENB (1 << 1) | |
32 | #define PHY_ENB (1 << 0) | |
33 | ||
34 | /* USBST */ | |
35 | #define ST_ACT (1 << 31) | |
36 | #define ST_PLL (1 << 30) | |
37 | ||
38 | struct rcar_usb_phy_priv { | |
39 | struct usb_phy phy; | |
40 | spinlock_t lock; | |
41 | ||
42 | void __iomem *reg0; | |
43 | void __iomem *reg1; | |
44 | int counter; | |
45 | }; | |
46 | ||
47 | #define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy) | |
48 | ||
49 | ||
50 | /* | |
51 | * USB initial/install operation. | |
52 | * | |
53 | * This function setup USB phy. | |
54 | * The used value and setting order came from | |
55 | * [USB :: Initial setting] on datasheet. | |
56 | */ | |
57 | static int rcar_usb_phy_init(struct usb_phy *phy) | |
58 | { | |
59 | struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy); | |
60 | struct device *dev = phy->dev; | |
61 | void __iomem *reg0 = priv->reg0; | |
62 | void __iomem *reg1 = priv->reg1; | |
63 | int i; | |
64 | u32 val; | |
65 | unsigned long flags; | |
66 | ||
67 | spin_lock_irqsave(&priv->lock, flags); | |
68 | if (priv->counter++ == 0) { | |
69 | ||
70 | /* | |
71 | * USB phy start-up | |
72 | */ | |
73 | ||
74 | /* (1) USB-PHY standby release */ | |
75 | iowrite32(PHY_ENB, (reg0 + USBPCTRL1)); | |
76 | ||
77 | /* (2) start USB-PHY internal PLL */ | |
78 | iowrite32(PHY_ENB | PLL_ENB, (reg0 + USBPCTRL1)); | |
79 | ||
80 | /* (3) USB module status check */ | |
81 | for (i = 0; i < 1024; i++) { | |
82 | udelay(10); | |
83 | val = ioread32(reg0 + USBST); | |
84 | if (val == (ST_ACT | ST_PLL)) | |
85 | break; | |
86 | } | |
87 | ||
88 | if (val != (ST_ACT | ST_PLL)) { | |
89 | dev_err(dev, "USB phy not ready\n"); | |
90 | goto phy_init_end; | |
91 | } | |
92 | ||
93 | /* (4) USB-PHY reset clear */ | |
94 | iowrite32(PHY_ENB | PLL_ENB | PHY_RST, (reg0 + USBPCTRL1)); | |
95 | ||
96 | /* set platform specific port settings */ | |
97 | iowrite32(0x00000000, (reg0 + USBPCTRL0)); | |
98 | ||
99 | /* | |
100 | * EHCI IP internal buffer setting | |
101 | * EHCI IP internal buffer enable | |
102 | * | |
103 | * These are recommended value of a datasheet | |
104 | * see [USB :: EHCI internal buffer setting] | |
105 | */ | |
106 | iowrite32(0x00ff0040, (reg0 + EIIBC1)); | |
107 | iowrite32(0x00ff0040, (reg1 + EIIBC1)); | |
108 | ||
109 | iowrite32(0x00000001, (reg0 + EIIBC2)); | |
110 | iowrite32(0x00000001, (reg1 + EIIBC2)); | |
111 | ||
112 | /* | |
113 | * Bus alignment settings | |
114 | */ | |
115 | ||
116 | /* (1) EHCI bus alignment (little endian) */ | |
117 | iowrite32(0x00000000, (reg0 + USBEH0)); | |
118 | ||
119 | /* (1) OHCI bus alignment (little endian) */ | |
120 | iowrite32(0x00000000, (reg0 + USBOH0)); | |
121 | } | |
122 | ||
123 | phy_init_end: | |
124 | spin_unlock_irqrestore(&priv->lock, flags); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static void rcar_usb_phy_shutdown(struct usb_phy *phy) | |
130 | { | |
131 | struct rcar_usb_phy_priv *priv = usb_phy_to_priv(phy); | |
132 | void __iomem *reg0 = priv->reg0; | |
133 | unsigned long flags; | |
134 | ||
135 | spin_lock_irqsave(&priv->lock, flags); | |
136 | ||
137 | if (priv->counter-- == 1) { /* last user */ | |
138 | iowrite32(0x00000000, (reg0 + USBPCTRL0)); | |
139 | iowrite32(0x00000000, (reg0 + USBPCTRL1)); | |
140 | } | |
141 | ||
142 | spin_unlock_irqrestore(&priv->lock, flags); | |
143 | } | |
144 | ||
41ac7b3a | 145 | static int rcar_usb_phy_probe(struct platform_device *pdev) |
1789e52a KM |
146 | { |
147 | struct rcar_usb_phy_priv *priv; | |
148 | struct resource *res0, *res1; | |
149 | struct device *dev = &pdev->dev; | |
150 | void __iomem *reg0, *reg1; | |
151 | int ret; | |
152 | ||
153 | res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
154 | res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
155 | if (!res0 || !res1) { | |
156 | dev_err(dev, "Not enough platform resources\n"); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | /* | |
161 | * CAUTION | |
162 | * | |
163 | * Because this phy address is also mapped under OHCI/EHCI address area, | |
164 | * this driver can't use devm_request_and_ioremap(dev, res) here | |
165 | */ | |
166 | reg0 = devm_ioremap_nocache(dev, res0->start, resource_size(res0)); | |
167 | reg1 = devm_ioremap_nocache(dev, res1->start, resource_size(res1)); | |
168 | if (!reg0 || !reg1) { | |
169 | dev_err(dev, "ioremap error\n"); | |
170 | return -ENOMEM; | |
171 | } | |
172 | ||
173 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
174 | if (!priv) { | |
175 | dev_err(dev, "priv data allocation error\n"); | |
176 | return -ENOMEM; | |
177 | } | |
178 | ||
179 | priv->reg0 = reg0; | |
180 | priv->reg1 = reg1; | |
181 | priv->counter = 0; | |
182 | priv->phy.dev = dev; | |
183 | priv->phy.label = dev_name(dev); | |
184 | priv->phy.init = rcar_usb_phy_init; | |
185 | priv->phy.shutdown = rcar_usb_phy_shutdown; | |
186 | spin_lock_init(&priv->lock); | |
187 | ||
188 | ret = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2); | |
189 | if (ret < 0) { | |
190 | dev_err(dev, "usb phy addition error\n"); | |
191 | return ret; | |
192 | } | |
193 | ||
194 | platform_set_drvdata(pdev, priv); | |
195 | ||
196 | return ret; | |
197 | } | |
198 | ||
fb4e98ab | 199 | static int rcar_usb_phy_remove(struct platform_device *pdev) |
1789e52a KM |
200 | { |
201 | struct rcar_usb_phy_priv *priv = platform_get_drvdata(pdev); | |
202 | ||
203 | usb_remove_phy(&priv->phy); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static struct platform_driver rcar_usb_phy_driver = { | |
209 | .driver = { | |
210 | .name = "rcar_usb_phy", | |
211 | }, | |
212 | .probe = rcar_usb_phy_probe, | |
7690417d | 213 | .remove = rcar_usb_phy_remove, |
1789e52a KM |
214 | }; |
215 | ||
216 | module_platform_driver(rcar_usb_phy_driver); | |
217 | ||
218 | MODULE_LICENSE("GPL v2"); | |
219 | MODULE_DESCRIPTION("Renesas R-Car USB phy"); | |
220 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |