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[u-boot] / drivers / mmc / rockchip_sdhci.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2016 Fuzhou Rockchip Electronics Co., Ltd
4  *
5  * Rockchip SD Host Controller Interface
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <dt-structs.h>
11 #include <linux/libfdt.h>
12 #include <malloc.h>
13 #include <mapmem.h>
14 #include <sdhci.h>
15 #include <clk.h>
16
17 /* 400KHz is max freq for card ID etc. Use that as min */
18 #define EMMC_MIN_FREQ   400000
19
20 struct rockchip_sdhc_plat {
21 #if CONFIG_IS_ENABLED(OF_PLATDATA)
22         struct dtd_rockchip_rk3399_sdhci_5_1 dtplat;
23 #endif
24         struct mmc_config cfg;
25         struct mmc mmc;
26 };
27
28 struct rockchip_sdhc {
29         struct sdhci_host host;
30         void *base;
31 };
32
33 static int arasan_sdhci_probe(struct udevice *dev)
34 {
35         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
36         struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
37         struct rockchip_sdhc *prv = dev_get_priv(dev);
38         struct sdhci_host *host = &prv->host;
39         int max_frequency, ret;
40         struct clk clk;
41
42 #if CONFIG_IS_ENABLED(OF_PLATDATA)
43         struct dtd_rockchip_rk3399_sdhci_5_1 *dtplat = &plat->dtplat;
44
45         host->name = dev->name;
46         host->ioaddr = map_sysmem(dtplat->reg[0], dtplat->reg[1]);
47         max_frequency = dtplat->max_frequency;
48         ret = clk_get_by_index_platdata(dev, 0, dtplat->clocks, &clk);
49 #else
50         max_frequency = dev_read_u32_default(dev, "max-frequency", 0);
51         ret = clk_get_by_index(dev, 0, &clk);
52 #endif
53         if (!ret) {
54                 ret = clk_set_rate(&clk, max_frequency);
55                 if (IS_ERR_VALUE(ret))
56                         printf("%s clk set rate fail!\n", __func__);
57         } else {
58                 printf("%s fail to get clk\n", __func__);
59         }
60
61         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
62         host->max_clk = max_frequency;
63         /*
64          * The sdhci-driver only supports 4bit and 8bit, as sdhci_setup_cfg
65          * doesn't allow us to clear MMC_MODE_4BIT.  Consequently, we don't
66          * check for other bus-width values.
67          */
68         if (host->bus_width == 8)
69                 host->host_caps |= MMC_MODE_8BIT;
70
71         ret = sdhci_setup_cfg(&plat->cfg, host, 0, EMMC_MIN_FREQ);
72
73         host->mmc = &plat->mmc;
74         if (ret)
75                 return ret;
76         host->mmc->priv = &prv->host;
77         host->mmc->dev = dev;
78         upriv->mmc = host->mmc;
79
80         return sdhci_probe(dev);
81 }
82
83 static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
84 {
85 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
86         struct sdhci_host *host = dev_get_priv(dev);
87
88         host->name = dev->name;
89         host->ioaddr = dev_read_addr_ptr(dev);
90         host->bus_width = dev_read_u32_default(dev, "bus-width", 4);
91 #endif
92
93         return 0;
94 }
95
96 static int rockchip_sdhci_bind(struct udevice *dev)
97 {
98         struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
99
100         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
101 }
102
103 static const struct udevice_id arasan_sdhci_ids[] = {
104         { .compatible = "arasan,sdhci-5.1" },
105         { }
106 };
107
108 U_BOOT_DRIVER(arasan_sdhci_drv) = {
109         .name           = "rockchip_rk3399_sdhci_5_1",
110         .id             = UCLASS_MMC,
111         .of_match       = arasan_sdhci_ids,
112         .ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
113         .ops            = &sdhci_ops,
114         .bind           = rockchip_sdhci_bind,
115         .probe          = arasan_sdhci_probe,
116         .priv_auto_alloc_size = sizeof(struct rockchip_sdhc),
117         .platdata_auto_alloc_size = sizeof(struct rockchip_sdhc_plat),
118 };