2 * Renesas R-Car USB phy driver
4 * Copyright (C) 2012-2013 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 * Copyright (C) 2013 Cogent Embedded, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/delay.h>
15 #include <linux/usb/otg.h>
16 #include <linux/platform_device.h>
17 #include <linux/spinlock.h>
18 #include <linux/module.h>
19 #include <linux/platform_data/usb-rcar-phy.h>
22 #define USBPCTRL0 0x00
23 #define USBPCTRL1 0x04
29 /* High-speed signal quality characteristic control registers (R8A7778 only) */
34 #define OVC2 (1 << 10) /* (R8A7779 only) */
35 /* Switches the OVC input pin for port 2: */
36 /* 1: USB_OVC2, 0: OVC2 */
37 #define OVC1_VBUS1 (1 << 9) /* Switches the OVC input pin for port 1: */
38 /* 1: USB_OVC1, 0: OVC1/VBUS1 */
39 /* Function mode: set to 0 */
40 #define OVC0 (1 << 8) /* Switches the OVC input pin for port 0: */
41 /* 1: USB_OVC0 pin, 0: OVC0 */
42 #define OVC2_ACT (1 << 6) /* (R8A7779 only) */
43 /* Host mode: OVC2 polarity: */
44 /* 1: active-high, 0: active-low */
45 #define PENC (1 << 4) /* Function mode: output level of PENC1 pin: */
47 #define OVC0_ACT (1 << 3) /* Host mode: OVC0 polarity: */
48 /* 1: active-high, 0: active-low */
49 #define OVC1_ACT (1 << 1) /* Host mode: OVC1 polarity: */
50 /* 1: active-high, 0: active-low */
51 /* Function mode: be sure to set to 1 */
52 #define PORT1 (1 << 0) /* Selects port 1 mode: */
53 /* 1: function, 0: host */
55 #define PHY_RST (1 << 2)
56 #define PLL_ENB (1 << 1)
57 #define PHY_ENB (1 << 0)
60 #define ST_ACT (1 << 31)
61 #define ST_PLL (1 << 30)
63 struct rcar_usb_phy_priv
{
72 #define usb_phy_to_priv(p) container_of(p, struct rcar_usb_phy_priv, phy)
76 * USB initial/install operation.
78 * This function setup USB phy.
79 * The used value and setting order came from
80 * [USB :: Initial setting] on datasheet.
82 static int rcar_usb_phy_init(struct usb_phy
*phy
)
84 struct rcar_usb_phy_priv
*priv
= usb_phy_to_priv(phy
);
85 struct device
*dev
= phy
->dev
;
86 struct rcar_phy_platform_data
*pdata
= dev
->platform_data
;
87 void __iomem
*reg0
= priv
->reg0
;
88 void __iomem
*reg1
= priv
->reg1
;
89 static const u8 ovcn_act
[] = { OVC0_ACT
, OVC1_ACT
, OVC2_ACT
};
94 spin_lock_irqsave(&priv
->lock
, flags
);
95 if (priv
->counter
++ == 0) {
101 /* (1) USB-PHY standby release */
102 iowrite32(PHY_ENB
, (reg0
+ USBPCTRL1
));
104 /* (2) start USB-PHY internal PLL */
105 iowrite32(PHY_ENB
| PLL_ENB
, (reg0
+ USBPCTRL1
));
107 /* (3) set USB-PHY in accord with the conditions of usage */
109 u32 hsqctl1
= pdata
->ferrite_bead
? 0x41 : 0;
110 u32 hsqctl2
= pdata
->ferrite_bead
? 0x0d : 7;
112 iowrite32(hsqctl1
, reg1
+ HSQCTL1
);
113 iowrite32(hsqctl2
, reg1
+ HSQCTL2
);
116 /* (4) USB module status check */
117 for (i
= 0; i
< 1024; i
++) {
119 val
= ioread32(reg0
+ USBST
);
120 if (val
== (ST_ACT
| ST_PLL
))
124 if (val
!= (ST_ACT
| ST_PLL
)) {
125 dev_err(dev
, "USB phy not ready\n");
129 /* (5) USB-PHY reset clear */
130 iowrite32(PHY_ENB
| PLL_ENB
| PHY_RST
, (reg0
+ USBPCTRL1
));
132 /* Board specific port settings */
134 if (pdata
->port1_func
)
138 for (i
= 0; i
< 3; i
++) {
139 /* OVCn bits follow each other in the right order */
140 if (pdata
->ovc_pin
[i
].select_3_3v
)
142 /* OVCn_ACT bits are spaced by irregular intervals */
143 if (pdata
->ovc_pin
[i
].active_high
)
146 iowrite32(val
, (reg0
+ USBPCTRL0
));
149 * Bus alignment settings
152 /* (1) EHCI bus alignment (little endian) */
153 iowrite32(0x00000000, (reg0
+ USBEH0
));
155 /* (1) OHCI bus alignment (little endian) */
156 iowrite32(0x00000000, (reg0
+ USBOH0
));
160 spin_unlock_irqrestore(&priv
->lock
, flags
);
165 static void rcar_usb_phy_shutdown(struct usb_phy
*phy
)
167 struct rcar_usb_phy_priv
*priv
= usb_phy_to_priv(phy
);
168 void __iomem
*reg0
= priv
->reg0
;
171 spin_lock_irqsave(&priv
->lock
, flags
);
173 if (priv
->counter
-- == 1) /* last user */
174 iowrite32(0x00000000, (reg0
+ USBPCTRL1
));
176 spin_unlock_irqrestore(&priv
->lock
, flags
);
179 static int rcar_usb_phy_probe(struct platform_device
*pdev
)
181 struct rcar_usb_phy_priv
*priv
;
182 struct resource
*res0
, *res1
;
183 struct device
*dev
= &pdev
->dev
;
184 void __iomem
*reg0
, *reg1
= NULL
;
187 if (!pdev
->dev
.platform_data
) {
188 dev_err(dev
, "No platform data\n");
192 res0
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
194 dev_err(dev
, "Not enough platform resources\n");
198 reg0
= devm_ioremap_resource(dev
, res0
);
200 return PTR_ERR(reg0
);
202 res1
= platform_get_resource(pdev
, IORESOURCE_MEM
, 1);
204 reg1
= devm_ioremap_resource(dev
, res1
);
206 return PTR_ERR(reg1
);
209 priv
= devm_kzalloc(dev
, sizeof(*priv
), GFP_KERNEL
);
211 dev_err(dev
, "priv data allocation error\n");
219 priv
->phy
.label
= dev_name(dev
);
220 priv
->phy
.init
= rcar_usb_phy_init
;
221 priv
->phy
.shutdown
= rcar_usb_phy_shutdown
;
222 spin_lock_init(&priv
->lock
);
224 ret
= usb_add_phy(&priv
->phy
, USB_PHY_TYPE_USB2
);
226 dev_err(dev
, "usb phy addition error\n");
230 platform_set_drvdata(pdev
, priv
);
235 static int rcar_usb_phy_remove(struct platform_device
*pdev
)
237 struct rcar_usb_phy_priv
*priv
= platform_get_drvdata(pdev
);
239 usb_remove_phy(&priv
->phy
);
244 static struct platform_driver rcar_usb_phy_driver
= {
246 .name
= "rcar_usb_phy",
248 .probe
= rcar_usb_phy_probe
,
249 .remove
= rcar_usb_phy_remove
,
252 module_platform_driver(rcar_usb_phy_driver
);
254 MODULE_LICENSE("GPL v2");
255 MODULE_DESCRIPTION("Renesas R-Car USB phy");
256 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");