2 * Allwinner sun4i USB phy driver
4 * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
7 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
9 * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
10 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
11 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
24 #include <linux/clk.h>
25 #include <linux/err.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
31 #include <linux/of_address.h>
32 #include <linux/phy/phy.h>
33 #include <linux/platform_device.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/reset.h>
38 #define REG_PHYCTL 0x04
39 #define REG_PHYBIST 0x08
40 #define REG_PHYTUNE 0x0c
42 #define PHYCTL_DATA BIT(7)
44 #define SUNXI_AHB_ICHR8_EN BIT(10)
45 #define SUNXI_AHB_INCR4_BURST_EN BIT(9)
46 #define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
47 #define SUNXI_ULPI_BYPASS_EN BIT(0)
49 /* Common Control Bits for Both PHYs */
50 #define PHY_PLL_BW 0x03
51 #define PHY_RES45_CAL_EN 0x0c
53 /* Private Control Bits for Each PHY */
54 #define PHY_TX_AMPLITUDE_TUNE 0x20
55 #define PHY_TX_SLEWRATE_TUNE 0x22
56 #define PHY_VBUSVALID_TH_SEL 0x25
57 #define PHY_PULLUP_RES_SEL 0x27
58 #define PHY_OTG_FUNC_EN 0x28
59 #define PHY_VBUS_DET_EN 0x29
60 #define PHY_DISCON_TH_SEL 0x2a
64 struct sun4i_usb_phy_data
{
69 struct sun4i_usb_phy
{
72 struct regulator
*vbus
;
73 struct reset_control
*reset
;
79 #define to_sun4i_usb_phy_data(phy) \
80 container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
82 static void sun4i_usb_phy_write(struct sun4i_usb_phy
*phy
, u32 addr
, u32 data
,
85 struct sun4i_usb_phy_data
*phy_data
= to_sun4i_usb_phy_data(phy
);
86 u32 temp
, usbc_bit
= BIT(phy
->index
* 2);
89 mutex_lock(&phy_data
->mutex
);
91 for (i
= 0; i
< len
; i
++) {
92 temp
= readl(phy_data
->base
+ REG_PHYCTL
);
94 /* clear the address portion */
98 temp
|= ((addr
+ i
) << 8);
99 writel(temp
, phy_data
->base
+ REG_PHYCTL
);
101 /* set the data bit and clear usbc bit*/
102 temp
= readb(phy_data
->base
+ REG_PHYCTL
);
106 temp
&= ~PHYCTL_DATA
;
108 writeb(temp
, phy_data
->base
+ REG_PHYCTL
);
111 temp
= readb(phy_data
->base
+ REG_PHYCTL
);
113 writeb(temp
, phy_data
->base
+ REG_PHYCTL
);
115 temp
= readb(phy_data
->base
+ REG_PHYCTL
);
117 writeb(temp
, phy_data
->base
+ REG_PHYCTL
);
121 mutex_unlock(&phy_data
->mutex
);
124 static void sun4i_usb_phy_passby(struct sun4i_usb_phy
*phy
, int enable
)
131 bits
= SUNXI_AHB_ICHR8_EN
| SUNXI_AHB_INCR4_BURST_EN
|
132 SUNXI_AHB_INCRX_ALIGN_EN
| SUNXI_ULPI_BYPASS_EN
;
134 reg_value
= readl(phy
->pmu
);
141 writel(reg_value
, phy
->pmu
);
144 static int sun4i_usb_phy_init(struct phy
*_phy
)
146 struct sun4i_usb_phy
*phy
= phy_get_drvdata(_phy
);
147 struct sun4i_usb_phy_data
*data
= to_sun4i_usb_phy_data(phy
);
150 ret
= clk_prepare_enable(phy
->clk
);
154 ret
= reset_control_deassert(phy
->reset
);
156 clk_disable_unprepare(phy
->clk
);
160 /* Adjust PHY's magnitude and rate */
161 sun4i_usb_phy_write(phy
, PHY_TX_AMPLITUDE_TUNE
, 0x14, 5);
163 /* Disconnect threshold adjustment */
164 sun4i_usb_phy_write(phy
, PHY_DISCON_TH_SEL
, data
->disc_thresh
, 2);
166 sun4i_usb_phy_passby(phy
, 1);
171 static int sun4i_usb_phy_exit(struct phy
*_phy
)
173 struct sun4i_usb_phy
*phy
= phy_get_drvdata(_phy
);
175 sun4i_usb_phy_passby(phy
, 0);
176 reset_control_assert(phy
->reset
);
177 clk_disable_unprepare(phy
->clk
);
182 static int sun4i_usb_phy_power_on(struct phy
*_phy
)
184 struct sun4i_usb_phy
*phy
= phy_get_drvdata(_phy
);
188 ret
= regulator_enable(phy
->vbus
);
193 static int sun4i_usb_phy_power_off(struct phy
*_phy
)
195 struct sun4i_usb_phy
*phy
= phy_get_drvdata(_phy
);
198 regulator_disable(phy
->vbus
);
203 static struct phy_ops sun4i_usb_phy_ops
= {
204 .init
= sun4i_usb_phy_init
,
205 .exit
= sun4i_usb_phy_exit
,
206 .power_on
= sun4i_usb_phy_power_on
,
207 .power_off
= sun4i_usb_phy_power_off
,
208 .owner
= THIS_MODULE
,
211 static struct phy
*sun4i_usb_phy_xlate(struct device
*dev
,
212 struct of_phandle_args
*args
)
214 struct sun4i_usb_phy_data
*data
= dev_get_drvdata(dev
);
216 if (WARN_ON(args
->args
[0] == 0 || args
->args
[0] >= data
->num_phys
))
217 return ERR_PTR(-ENODEV
);
219 return data
->phys
[args
->args
[0]].phy
;
222 static int sun4i_usb_phy_probe(struct platform_device
*pdev
)
224 struct sun4i_usb_phy_data
*data
;
225 struct device
*dev
= &pdev
->dev
;
226 struct device_node
*np
= dev
->of_node
;
227 struct phy_provider
*phy_provider
;
228 bool dedicated_clocks
;
229 struct resource
*res
;
232 data
= devm_kzalloc(dev
, sizeof(*data
), GFP_KERNEL
);
236 mutex_init(&data
->mutex
);
238 if (of_device_is_compatible(np
, "allwinner,sun5i-a13-usb-phy"))
243 if (of_device_is_compatible(np
, "allwinner,sun4i-a10-usb-phy"))
244 data
->disc_thresh
= 3;
246 data
->disc_thresh
= 2;
248 if (of_device_is_compatible(np
, "allwinner,sun6i-a31-usb-phy"))
249 dedicated_clocks
= true;
251 dedicated_clocks
= false;
253 res
= platform_get_resource_byname(pdev
, IORESOURCE_MEM
, "phy_ctrl");
254 data
->base
= devm_ioremap_resource(dev
, res
);
255 if (IS_ERR(data
->base
))
256 return PTR_ERR(data
->base
);
258 /* Skip 0, 0 is the phy for otg which is not yet supported. */
259 for (i
= 1; i
< data
->num_phys
; i
++) {
260 struct sun4i_usb_phy
*phy
= data
->phys
+ i
;
263 snprintf(name
, sizeof(name
), "usb%d_vbus", i
);
264 phy
->vbus
= devm_regulator_get_optional(dev
, name
);
265 if (IS_ERR(phy
->vbus
)) {
266 if (PTR_ERR(phy
->vbus
) == -EPROBE_DEFER
)
267 return -EPROBE_DEFER
;
271 if (dedicated_clocks
)
272 snprintf(name
, sizeof(name
), "usb%d_phy", i
);
274 strlcpy(name
, "usb_phy", sizeof(name
));
276 phy
->clk
= devm_clk_get(dev
, name
);
277 if (IS_ERR(phy
->clk
)) {
278 dev_err(dev
, "failed to get clock %s\n", name
);
279 return PTR_ERR(phy
->clk
);
282 snprintf(name
, sizeof(name
), "usb%d_reset", i
);
283 phy
->reset
= devm_reset_control_get(dev
, name
);
284 if (IS_ERR(phy
->reset
)) {
285 dev_err(dev
, "failed to get reset %s\n", name
);
286 return PTR_ERR(phy
->reset
);
289 if (i
) { /* No pmu for usbc0 */
290 snprintf(name
, sizeof(name
), "pmu%d", i
);
291 res
= platform_get_resource_byname(pdev
,
292 IORESOURCE_MEM
, name
);
293 phy
->pmu
= devm_ioremap_resource(dev
, res
);
294 if (IS_ERR(phy
->pmu
))
295 return PTR_ERR(phy
->pmu
);
298 phy
->phy
= devm_phy_create(dev
, NULL
, &sun4i_usb_phy_ops
, NULL
);
299 if (IS_ERR(phy
->phy
)) {
300 dev_err(dev
, "failed to create PHY %d\n", i
);
301 return PTR_ERR(phy
->phy
);
305 phy_set_drvdata(phy
->phy
, &data
->phys
[i
]);
308 dev_set_drvdata(dev
, data
);
309 phy_provider
= devm_of_phy_provider_register(dev
, sun4i_usb_phy_xlate
);
311 return PTR_ERR_OR_ZERO(phy_provider
);
314 static const struct of_device_id sun4i_usb_phy_of_match
[] = {
315 { .compatible
= "allwinner,sun4i-a10-usb-phy" },
316 { .compatible
= "allwinner,sun5i-a13-usb-phy" },
317 { .compatible
= "allwinner,sun6i-a31-usb-phy" },
318 { .compatible
= "allwinner,sun7i-a20-usb-phy" },
321 MODULE_DEVICE_TABLE(of
, sun4i_usb_phy_of_match
);
323 static struct platform_driver sun4i_usb_phy_driver
= {
324 .probe
= sun4i_usb_phy_probe
,
326 .of_match_table
= sun4i_usb_phy_of_match
,
327 .name
= "sun4i-usb-phy",
330 module_platform_driver(sun4i_usb_phy_driver
);
332 MODULE_DESCRIPTION("Allwinner sun4i USB phy driver");
333 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
334 MODULE_LICENSE("GPL v2");