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1 | /* |
2 | * Copyright (c) 2013 Linaro Ltd. | |
3 | * Copyright (c) 2013 Hisilicon Limited. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/clk.h> | |
14 | #include <linux/mmc/host.h> | |
15 | #include <linux/mmc/dw_mmc.h> | |
16 | #include <linux/of_address.h> | |
17 | ||
18 | #include "dw_mmc.h" | |
19 | #include "dw_mmc-pltfm.h" | |
20 | ||
21 | #define MAX_NUMS 10 | |
22 | struct dw_mci_k3_priv_data { | |
23 | u32 clk_table[MAX_NUMS]; | |
24 | }; | |
25 | ||
26 | static void dw_mci_k3_set_ios(struct dw_mci *host, struct mmc_ios *ios) | |
27 | { | |
28 | struct dw_mci_k3_priv_data *priv = host->priv; | |
29 | u32 rate = priv->clk_table[ios->timing]; | |
30 | int ret; | |
31 | ||
32 | if (!rate) { | |
33 | dev_warn(host->dev, | |
34 | "no specified rate in timing %u\n", ios->timing); | |
35 | return; | |
36 | } | |
37 | ||
38 | ret = clk_set_rate(host->ciu_clk, rate); | |
39 | if (ret) | |
40 | dev_warn(host->dev, "failed to set clock rate %uHz\n", rate); | |
41 | ||
42 | host->bus_hz = clk_get_rate(host->ciu_clk); | |
43 | } | |
44 | ||
45 | static int dw_mci_k3_parse_dt(struct dw_mci *host) | |
46 | { | |
47 | struct dw_mci_k3_priv_data *priv; | |
48 | struct device_node *node = host->dev->of_node; | |
49 | struct property *prop; | |
50 | const __be32 *cur; | |
51 | u32 val, num = 0; | |
52 | ||
53 | priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); | |
54 | if (!priv) { | |
55 | dev_err(host->dev, "mem alloc failed for private data\n"); | |
56 | return -ENOMEM; | |
57 | } | |
58 | host->priv = priv; | |
59 | ||
60 | of_property_for_each_u32(node, "clock-freq-table", prop, cur, val) { | |
61 | if (num >= MAX_NUMS) | |
62 | break; | |
63 | priv->clk_table[num++] = val; | |
64 | } | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static const struct dw_mci_drv_data k3_drv_data = { | |
69 | .set_ios = dw_mci_k3_set_ios, | |
70 | .parse_dt = dw_mci_k3_parse_dt, | |
71 | }; | |
72 | ||
73 | static const struct of_device_id dw_mci_k3_match[] = { | |
74 | { .compatible = "hisilicon,hi4511-dw-mshc", .data = &k3_drv_data, }, | |
75 | {}, | |
76 | }; | |
77 | MODULE_DEVICE_TABLE(of, dw_mci_k3_match); | |
78 | ||
79 | static int dw_mci_k3_probe(struct platform_device *pdev) | |
80 | { | |
81 | const struct dw_mci_drv_data *drv_data; | |
82 | const struct of_device_id *match; | |
83 | ||
84 | match = of_match_node(dw_mci_k3_match, pdev->dev.of_node); | |
85 | drv_data = match->data; | |
86 | ||
87 | return dw_mci_pltfm_register(pdev, drv_data); | |
88 | } | |
89 | ||
90 | static int dw_mci_k3_suspend(struct device *dev) | |
91 | { | |
92 | struct dw_mci *host = dev_get_drvdata(dev); | |
93 | int ret; | |
94 | ||
95 | ret = dw_mci_suspend(host); | |
96 | if (!ret) | |
97 | clk_disable_unprepare(host->ciu_clk); | |
98 | ||
99 | return ret; | |
100 | } | |
101 | ||
102 | static int dw_mci_k3_resume(struct device *dev) | |
103 | { | |
104 | struct dw_mci *host = dev_get_drvdata(dev); | |
105 | int ret; | |
106 | ||
107 | ret = clk_prepare_enable(host->ciu_clk); | |
108 | if (ret) { | |
109 | dev_err(host->dev, "failed to enable ciu clock\n"); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | return dw_mci_resume(host); | |
114 | } | |
115 | ||
116 | SIMPLE_DEV_PM_OPS(dw_mci_k3_pmops, dw_mci_k3_suspend, dw_mci_k3_resume); | |
117 | ||
118 | static struct platform_driver dw_mci_k3_pltfm_driver = { | |
119 | .probe = dw_mci_k3_probe, | |
120 | .remove = dw_mci_pltfm_remove, | |
121 | .driver = { | |
122 | .name = "dwmmc_k3", | |
123 | .of_match_table = dw_mci_k3_match, | |
124 | .pm = &dw_mci_k3_pmops, | |
125 | }, | |
126 | }; | |
127 | ||
128 | module_platform_driver(dw_mci_k3_pltfm_driver); | |
129 | ||
130 | MODULE_DESCRIPTION("K3 Specific DW-MSHC Driver Extension"); | |
131 | MODULE_LICENSE("GPL v2"); | |
132 | MODULE_ALIAS("platform:dwmmc-k3"); |