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15302800 RZ |
1 | /* |
2 | * Copyright 2012 Freescale Semiconductor, Inc. | |
3 | * Copyright (C) 2012 Marek Vasut <marex@denx.de> | |
4 | * on behalf of DENX Software Engineering GmbH | |
5 | * | |
6 | * The code contained herein is licensed under the GNU General Public | |
7 | * License. You may obtain a copy of the GNU General Public License | |
8 | * Version 2 or later at the following locations: | |
9 | * | |
10 | * http://www.opensource.org/licenses/gpl-license.html | |
11 | * http://www.gnu.org/copyleft/gpl.html | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/of_platform.h> | |
16 | #include <linux/of_gpio.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/pm_runtime.h> | |
19 | #include <linux/dma-mapping.h> | |
20 | #include <linux/usb/chipidea.h> | |
21 | #include <linux/clk.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | ||
24 | #include "ci.h" | |
25 | ||
26 | #define pdev_to_phy(pdev) \ | |
27 | ((struct usb_phy *)platform_get_drvdata(pdev)) | |
28 | ||
29 | struct ci13xxx_imx_data { | |
30 | struct device_node *phy_np; | |
31 | struct usb_phy *phy; | |
32 | struct platform_device *ci_pdev; | |
33 | struct clk *clk; | |
34 | struct regulator *reg_vbus; | |
35 | }; | |
36 | ||
37 | static struct ci13xxx_platform_data ci13xxx_imx_platdata __devinitdata = { | |
38 | .name = "ci13xxx_imx", | |
39 | .flags = CI13XXX_REQUIRE_TRANSCEIVER | | |
40 | CI13XXX_PULLUP_ON_VBUS | | |
41 | CI13XXX_DISABLE_STREAMING, | |
42 | .capoffset = DEF_CAPOFFSET, | |
43 | }; | |
44 | ||
45 | static int __devinit ci13xxx_imx_probe(struct platform_device *pdev) | |
46 | { | |
47 | struct ci13xxx_imx_data *data; | |
48 | struct platform_device *plat_ci, *phy_pdev; | |
49 | struct device_node *phy_np; | |
50 | struct resource *res; | |
51 | struct regulator *reg_vbus; | |
52 | int ret; | |
53 | ||
54 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
55 | if (!data) { | |
56 | dev_err(&pdev->dev, "Failed to allocate CI13xxx-IMX data!\n"); | |
57 | return -ENOMEM; | |
58 | } | |
59 | ||
60 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
61 | if (!res) { | |
62 | dev_err(&pdev->dev, "Can't get device resources!\n"); | |
63 | return -ENOENT; | |
64 | } | |
65 | ||
66 | data->clk = devm_clk_get(&pdev->dev, NULL); | |
67 | if (IS_ERR(data->clk)) { | |
68 | dev_err(&pdev->dev, | |
69 | "Failed to get clock, err=%ld\n", PTR_ERR(data->clk)); | |
70 | return PTR_ERR(data->clk); | |
71 | } | |
72 | ||
73 | ret = clk_prepare_enable(data->clk); | |
74 | if (ret) { | |
75 | dev_err(&pdev->dev, | |
76 | "Failed to prepare or enable clock, err=%d\n", ret); | |
77 | return ret; | |
78 | } | |
79 | ||
80 | phy_np = of_parse_phandle(pdev->dev.of_node, "fsl,usbphy", 0); | |
81 | if (phy_np) { | |
82 | data->phy_np = phy_np; | |
83 | phy_pdev = of_find_device_by_node(phy_np); | |
84 | if (phy_pdev) { | |
85 | struct usb_phy *phy; | |
86 | phy = pdev_to_phy(phy_pdev); | |
87 | if (phy && | |
88 | try_module_get(phy_pdev->dev.driver->owner)) { | |
89 | usb_phy_init(phy); | |
90 | data->phy = phy; | |
91 | } | |
92 | } | |
93 | } | |
94 | ||
95 | /* we only support host now, so enable vbus here */ | |
96 | reg_vbus = devm_regulator_get(&pdev->dev, "vbus"); | |
97 | if (!IS_ERR(reg_vbus)) { | |
98 | ret = regulator_enable(reg_vbus); | |
99 | if (ret) { | |
100 | dev_err(&pdev->dev, | |
101 | "Failed to enable vbus regulator, err=%d\n", | |
102 | ret); | |
103 | goto put_np; | |
104 | } | |
105 | data->reg_vbus = reg_vbus; | |
106 | } else { | |
107 | reg_vbus = NULL; | |
108 | } | |
109 | ||
110 | ci13xxx_imx_platdata.phy = data->phy; | |
111 | ||
112 | if (!pdev->dev.dma_mask) { | |
113 | pdev->dev.dma_mask = devm_kzalloc(&pdev->dev, | |
114 | sizeof(*pdev->dev.dma_mask), GFP_KERNEL); | |
115 | if (!pdev->dev.dma_mask) { | |
116 | ret = -ENOMEM; | |
117 | dev_err(&pdev->dev, "Failed to alloc dma_mask!\n"); | |
118 | goto err; | |
119 | } | |
120 | *pdev->dev.dma_mask = DMA_BIT_MASK(32); | |
121 | dma_set_coherent_mask(&pdev->dev, *pdev->dev.dma_mask); | |
122 | } | |
123 | plat_ci = ci13xxx_add_device(&pdev->dev, | |
124 | pdev->resource, pdev->num_resources, | |
125 | &ci13xxx_imx_platdata); | |
126 | if (IS_ERR(plat_ci)) { | |
127 | ret = PTR_ERR(plat_ci); | |
128 | dev_err(&pdev->dev, | |
129 | "Can't register ci_hdrc platform device, err=%d\n", | |
130 | ret); | |
131 | goto err; | |
132 | } | |
133 | ||
134 | data->ci_pdev = plat_ci; | |
135 | platform_set_drvdata(pdev, data); | |
136 | ||
137 | pm_runtime_no_callbacks(&pdev->dev); | |
138 | pm_runtime_enable(&pdev->dev); | |
139 | ||
140 | return 0; | |
141 | ||
142 | err: | |
143 | if (reg_vbus) | |
144 | regulator_disable(reg_vbus); | |
145 | put_np: | |
146 | if (phy_np) | |
147 | of_node_put(phy_np); | |
148 | clk_disable_unprepare(data->clk); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static int __devexit ci13xxx_imx_remove(struct platform_device *pdev) | |
153 | { | |
154 | struct ci13xxx_imx_data *data = platform_get_drvdata(pdev); | |
155 | ||
156 | pm_runtime_disable(&pdev->dev); | |
157 | ci13xxx_remove_device(data->ci_pdev); | |
158 | ||
159 | if (data->reg_vbus) | |
160 | regulator_disable(data->reg_vbus); | |
161 | ||
162 | if (data->phy) { | |
163 | usb_phy_shutdown(data->phy); | |
164 | module_put(data->phy->dev->driver->owner); | |
165 | } | |
166 | ||
167 | of_node_put(data->phy_np); | |
168 | ||
169 | clk_disable_unprepare(data->clk); | |
170 | ||
171 | platform_set_drvdata(pdev, NULL); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | static const struct of_device_id ci13xxx_imx_dt_ids[] = { | |
177 | { .compatible = "fsl,imx27-usb", }, | |
178 | { /* sentinel */ } | |
179 | }; | |
180 | MODULE_DEVICE_TABLE(of, ci13xxx_imx_dt_ids); | |
181 | ||
182 | static struct platform_driver ci13xxx_imx_driver = { | |
183 | .probe = ci13xxx_imx_probe, | |
184 | .remove = __devexit_p(ci13xxx_imx_remove), | |
185 | .driver = { | |
186 | .name = "imx_usb", | |
187 | .owner = THIS_MODULE, | |
188 | .of_match_table = ci13xxx_imx_dt_ids, | |
189 | }, | |
190 | }; | |
191 | ||
192 | module_platform_driver(ci13xxx_imx_driver); | |
193 | ||
194 | MODULE_ALIAS("platform:imx-usb"); | |
195 | MODULE_LICENSE("GPL v2"); | |
196 | MODULE_DESCRIPTION("CI13xxx i.MX USB binding"); | |
197 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); | |
198 | MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); |