1 /*
2 * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
3 *
4 * Copyright (C) 2015 Broadcom Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <linux/io.h>
18 #include <linux/mmc/host.h>
19 #include <linux/module.h>
20 #include <linux/of.h>
21
22 #include "sdhci-pltfm.h"
23
24 #ifdef CONFIG_PM_SLEEP
25
sdhci_brcmstb_suspend(struct device * dev)26 static int sdhci_brcmstb_suspend(struct device *dev)
27 {
28 struct sdhci_host *host = dev_get_drvdata(dev);
29 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
30 int res;
31
32 res = sdhci_suspend_host(host);
33 if (res)
34 return res;
35 clk_disable_unprepare(pltfm_host->clk);
36 return res;
37 }
38
sdhci_brcmstb_resume(struct device * dev)39 static int sdhci_brcmstb_resume(struct device *dev)
40 {
41 struct sdhci_host *host = dev_get_drvdata(dev);
42 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
43 int err;
44
45 err = clk_prepare_enable(pltfm_host->clk);
46 if (err)
47 return err;
48 return sdhci_resume_host(host);
49 }
50
51 #endif /* CONFIG_PM_SLEEP */
52
53 static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend,
54 sdhci_brcmstb_resume);
55
56 static const struct sdhci_ops sdhci_brcmstb_ops = {
57 .set_clock = sdhci_set_clock,
58 .set_bus_width = sdhci_set_bus_width,
59 .reset = sdhci_reset,
60 .set_uhs_signaling = sdhci_set_uhs_signaling,
61 };
62
63 static struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
64 .ops = &sdhci_brcmstb_ops,
65 };
66
sdhci_brcmstb_probe(struct platform_device * pdev)67 static int sdhci_brcmstb_probe(struct platform_device *pdev)
68 {
69 struct sdhci_host *host;
70 struct sdhci_pltfm_host *pltfm_host;
71 struct clk *clk;
72 int res;
73
74 clk = devm_clk_get(&pdev->dev, NULL);
75 if (IS_ERR(clk)) {
76 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
77 clk = NULL;
78 }
79 res = clk_prepare_enable(clk);
80 if (res)
81 return res;
82
83 host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
84 if (IS_ERR(host)) {
85 res = PTR_ERR(host);
86 goto err_clk;
87 }
88
89 /* Enable MMC_CAP2_HC_ERASE_SZ for better max discard calculations */
90 host->mmc->caps2 |= MMC_CAP2_HC_ERASE_SZ;
91
92 sdhci_get_of_property(pdev);
93 mmc_of_parse(host->mmc);
94
95 /*
96 * Supply the existing CAPS, but clear the UHS modes. This
97 * will allow these modes to be specified by device tree
98 * properties through mmc_of_parse().
99 */
100 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
101 if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
102 host->caps &= ~SDHCI_CAN_64BIT;
103 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
104 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
105 SDHCI_SUPPORT_DDR50);
106 host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
107 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
108
109 res = sdhci_add_host(host);
110 if (res)
111 goto err;
112
113 pltfm_host = sdhci_priv(host);
114 pltfm_host->clk = clk;
115 return res;
116
117 err:
118 sdhci_pltfm_free(pdev);
119 err_clk:
120 clk_disable_unprepare(clk);
121 return res;
122 }
123
124 static const struct of_device_id sdhci_brcm_of_match[] = {
125 { .compatible = "brcm,bcm7425-sdhci" },
126 { .compatible = "brcm,bcm7445-sdhci" },
127 {},
128 };
129 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
130
131 static struct platform_driver sdhci_brcmstb_driver = {
132 .driver = {
133 .name = "sdhci-brcmstb",
134 .pm = &sdhci_brcmstb_pmops,
135 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
136 },
137 .probe = sdhci_brcmstb_probe,
138 .remove = sdhci_pltfm_unregister,
139 };
140
141 module_platform_driver(sdhci_brcmstb_driver);
142
143 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
144 MODULE_AUTHOR("Broadcom");
145 MODULE_LICENSE("GPL v2");
146