1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * NPCM SDHC MMC host controller driver.
4 *
5 * Copyright (c) 2023 Nuvoton Technology corporation.
6 */
7
8 #include <linux/clk.h>
9 #include <linux/err.h>
10 #include <linux/io.h>
11 #include <linux/mmc/host.h>
12 #include <linux/mmc/mmc.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16
17 #include "sdhci-pltfm.h"
18
19 static const struct sdhci_pltfm_data npcm7xx_sdhci_pdata = {
20 .quirks = SDHCI_QUIRK_DELAY_AFTER_POWER,
21 .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC |
22 SDHCI_QUIRK2_NO_1_8_V,
23 };
24
25 static const struct sdhci_pltfm_data npcm8xx_sdhci_pdata = {
26 .quirks = SDHCI_QUIRK_DELAY_AFTER_POWER,
27 .quirks2 = SDHCI_QUIRK2_STOP_WITH_TC,
28 };
29
npcm_sdhci_probe(struct platform_device * pdev)30 static int npcm_sdhci_probe(struct platform_device *pdev)
31 {
32 const struct sdhci_pltfm_data *data;
33 struct sdhci_pltfm_host *pltfm_host;
34 struct device *dev = &pdev->dev;
35 struct sdhci_host *host;
36 u32 caps;
37 int ret;
38
39 data = of_device_get_match_data(dev);
40 if (!data)
41 return -EINVAL;
42
43 host = sdhci_pltfm_init(pdev, data, 0);
44 if (IS_ERR(host))
45 return PTR_ERR(host);
46
47 pltfm_host = sdhci_priv(host);
48
49 pltfm_host->clk = devm_clk_get_optional_enabled(dev, NULL);
50 if (IS_ERR(pltfm_host->clk)) {
51 ret = PTR_ERR(pltfm_host->clk);
52 goto err_sdhci;
53 }
54
55 caps = sdhci_readl(host, SDHCI_CAPABILITIES);
56 if (caps & SDHCI_CAN_DO_8BIT)
57 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
58
59 ret = mmc_of_parse(host->mmc);
60 if (ret)
61 goto err_sdhci;
62
63 ret = sdhci_add_host(host);
64 if (ret)
65 goto err_sdhci;
66
67 return 0;
68
69 err_sdhci:
70 sdhci_pltfm_free(pdev);
71 return ret;
72 }
73
74 static const struct of_device_id npcm_sdhci_of_match[] = {
75 { .compatible = "nuvoton,npcm750-sdhci", .data = &npcm7xx_sdhci_pdata },
76 { .compatible = "nuvoton,npcm845-sdhci", .data = &npcm8xx_sdhci_pdata },
77 { }
78 };
79 MODULE_DEVICE_TABLE(of, npcm_sdhci_of_match);
80
81 static struct platform_driver npcm_sdhci_driver = {
82 .driver = {
83 .name = "npcm-sdhci",
84 .of_match_table = npcm_sdhci_of_match,
85 .pm = &sdhci_pltfm_pmops,
86 },
87 .probe = npcm_sdhci_probe,
88 .remove_new = sdhci_pltfm_remove,
89 };
90 module_platform_driver(npcm_sdhci_driver);
91
92 MODULE_DESCRIPTION("NPCM Secure Digital Host Controller Interface driver");
93 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
94 MODULE_LICENSE("GPL");
95