1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <mmc.h>
10 #include <reset-uclass.h>
11 #include <sdhci.h>
12 #include <asm/arch/sdhci.h>
13
14 DECLARE_GLOBAL_DATA_PTR;
15
16 struct sti_sdhci_plat {
17 struct mmc_config cfg;
18 struct mmc mmc;
19 struct reset_ctl reset;
20 int instance;
21 };
22
23 /**
24 * sti_mmc_core_config: configure the Arasan HC
25 * @dev : udevice
26 *
27 * Description: this function is to configure the Arasan MMC HC.
28 * This should be called when the system starts in case of, on the SoC,
29 * it is needed to configure the host controller.
30 * This happens on some SoCs, i.e. StiH410, where the MMC0 inside the flashSS
31 * needs to be configured as MMC 4.5 to have full capabilities.
32 * W/o these settings the SDHCI could configure and use the embedded controller
33 * with limited features.
34 */
sti_mmc_core_config(struct udevice * dev)35 static int sti_mmc_core_config(struct udevice *dev)
36 {
37 struct sti_sdhci_plat *plat = dev_get_platdata(dev);
38 struct sdhci_host *host = dev_get_priv(dev);
39 int ret;
40
41 /* only MMC1 has a reset line */
42 if (plat->instance) {
43 ret = reset_deassert(&plat->reset);
44 if (ret < 0) {
45 pr_err("MMC1 deassert failed: %d", ret);
46 return ret;
47 }
48 }
49
50 writel(STI_FLASHSS_MMC_CORE_CONFIG_1,
51 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_1);
52
53 if (plat->instance) {
54 writel(STI_FLASHSS_MMC_CORE_CONFIG2,
55 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2);
56 writel(STI_FLASHSS_MMC_CORE_CONFIG3,
57 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3);
58 } else {
59 writel(STI_FLASHSS_SDCARD_CORE_CONFIG2,
60 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_2);
61 writel(STI_FLASHSS_SDCARD_CORE_CONFIG3,
62 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_3);
63 }
64 writel(STI_FLASHSS_MMC_CORE_CONFIG4,
65 host->ioaddr + FLASHSS_MMC_CORE_CONFIG_4);
66
67 return 0;
68 }
69
sti_sdhci_probe(struct udevice * dev)70 static int sti_sdhci_probe(struct udevice *dev)
71 {
72 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
73 struct sti_sdhci_plat *plat = dev_get_platdata(dev);
74 struct sdhci_host *host = dev_get_priv(dev);
75 int ret;
76
77 /*
78 * identify current mmc instance, mmc1 has a reset, not mmc0
79 * MMC0 is wired to the SD slot,
80 * MMC1 is wired on the high speed connector
81 */
82 ret = reset_get_by_index(dev, 0, &plat->reset);
83 if (!ret)
84 plat->instance = 1;
85 else
86 if (ret == -ENOENT)
87 plat->instance = 0;
88 else
89 return ret;
90
91 ret = sti_mmc_core_config(dev);
92 if (ret)
93 return ret;
94
95 host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
96 SDHCI_QUIRK_32BIT_DMA_ADDR |
97 SDHCI_QUIRK_NO_HISPD_BIT;
98
99 host->host_caps = MMC_MODE_DDR_52MHz;
100
101 ret = sdhci_setup_cfg(&plat->cfg, host, 50000000, 400000);
102 if (ret)
103 return ret;
104
105 host->mmc = &plat->mmc;
106 host->mmc->priv = host;
107 host->mmc->dev = dev;
108 upriv->mmc = host->mmc;
109
110 return sdhci_probe(dev);
111 }
112
sti_sdhci_ofdata_to_platdata(struct udevice * dev)113 static int sti_sdhci_ofdata_to_platdata(struct udevice *dev)
114 {
115 struct sdhci_host *host = dev_get_priv(dev);
116
117 host->name = strdup(dev->name);
118 host->ioaddr = (void *)devfdt_get_addr(dev);
119
120 host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
121 "bus-width", 4);
122
123 return 0;
124 }
125
sti_sdhci_bind(struct udevice * dev)126 static int sti_sdhci_bind(struct udevice *dev)
127 {
128 struct sti_sdhci_plat *plat = dev_get_platdata(dev);
129
130 return sdhci_bind(dev, &plat->mmc, &plat->cfg);
131 }
132
133 static const struct udevice_id sti_sdhci_ids[] = {
134 { .compatible = "st,sdhci" },
135 { }
136 };
137
138 U_BOOT_DRIVER(sti_mmc) = {
139 .name = "sti_sdhci",
140 .id = UCLASS_MMC,
141 .of_match = sti_sdhci_ids,
142 .bind = sti_sdhci_bind,
143 .ops = &sdhci_ops,
144 .ofdata_to_platdata = sti_sdhci_ofdata_to_platdata,
145 .probe = sti_sdhci_probe,
146 .priv_auto_alloc_size = sizeof(struct sdhci_host),
147 .platdata_auto_alloc_size = sizeof(struct sti_sdhci_plat),
148 };
149