xref: /openbmc/u-boot/drivers/mmc/rockchip_sdhci.c (revision 3c03f492)
1 /*
2  * (C) Copyright 2016 Fuzhou Rockchip Electronics Co., Ltd
3  *
4  * Rockchip SD Host Controller Interface
5  *
6  * SPDX-License-Identifier:	GPL-2.0+
7  */
8 
9 #include <common.h>
10 #include <dm.h>
11 #include <fdtdec.h>
12 #include <libfdt.h>
13 #include <malloc.h>
14 #include <sdhci.h>
15 #include <clk.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 /* 400KHz is max freq for card ID etc. Use that as min */
19 #define EMMC_MIN_FREQ	400000
20 
21 struct rockchip_sdhc_plat {
22 	struct mmc_config cfg;
23 	struct mmc mmc;
24 };
25 
26 struct rockchip_sdhc {
27 	struct sdhci_host host;
28 	void *base;
29 };
30 
31 static int arasan_sdhci_probe(struct udevice *dev)
32 {
33 	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
34 	struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
35 	struct rockchip_sdhc *prv = dev_get_priv(dev);
36 	struct sdhci_host *host = &prv->host;
37 	int max_frequency, ret;
38 	struct clk clk;
39 
40 
41 	max_frequency = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
42 			"max-frequency", 0);
43 	ret = clk_get_by_index(dev, 0, &clk);
44 	if (!ret) {
45 		ret = clk_set_rate(&clk, max_frequency);
46 		if (IS_ERR_VALUE(ret))
47 			printf("%s clk set rate fail!\n", __func__);
48 	} else {
49 		printf("%s fail to get clk\n", __func__);
50 	}
51 
52 	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
53 	host->max_clk = max_frequency;
54 
55 	ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
56 
57 	host->mmc = &plat->mmc;
58 	if (ret)
59 		return ret;
60 	host->mmc->priv = &prv->host;
61 	host->mmc->dev = dev;
62 	upriv->mmc = host->mmc;
63 
64 	return sdhci_probe(dev);
65 }
66 
67 static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
68 {
69 	struct sdhci_host *host = dev_get_priv(dev);
70 
71 	host->name = dev->name;
72 	host->ioaddr = dev_get_addr_ptr(dev);
73 
74 	return 0;
75 }
76 
77 static int rockchip_sdhci_bind(struct udevice *dev)
78 {
79 	struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
80 
81 	return sdhci_bind(dev, &plat->mmc, &plat->cfg);
82 }
83 
84 static const struct udevice_id arasan_sdhci_ids[] = {
85 	{ .compatible = "arasan,sdhci-5.1" },
86 	{ }
87 };
88 
89 U_BOOT_DRIVER(arasan_sdhci_drv) = {
90 	.name		= "arasan_sdhci",
91 	.id		= UCLASS_MMC,
92 	.of_match	= arasan_sdhci_ids,
93 	.ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
94 	.ops		= &sdhci_ops,
95 	.bind		= rockchip_sdhci_bind,
96 	.probe		= arasan_sdhci_probe,
97 	.priv_auto_alloc_size = sizeof(struct rockchip_sdhc),
98 	.platdata_auto_alloc_size = sizeof(struct rockchip_sdhc_plat),
99 };
100