gpio-uclass.c: Fix comparison of unsigned expression warning
[platform/kernel/u-boot.git] / drivers / mmc / sti_sdhci.c
1 /*
2  *  Copyright (c) 2017
3  *  Patrice Chotard <patrice.chotard@st.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <mmc.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 };
20
21 /*
22  * used to get access to MMC1 reset,
23  * will be removed when STi reset driver will be available
24  */
25 #define STIH410_SYSCONF5_BASE           0x092b0000
26
27 /**
28  * sti_mmc_core_config: configure the Arasan HC
29  * @regbase: base address
30  * @mmc_instance: mmc instance id
31  * Description: this function is to configure the Arasan MMC HC.
32  * This should be called when the system starts in case of, on the SoC,
33  * it is needed to configure the host controller.
34  * This happens on some SoCs, i.e. StiH410, where the MMC0 inside the flashSS
35  * needs to be configured as MMC 4.5 to have full capabilities.
36  * W/o these settings the SDHCI could configure and use the embedded controller
37  * with limited features.
38  */
39 static void sti_mmc_core_config(const u32 regbase, int mmc_instance)
40 {
41         unsigned long *sysconf;
42
43         /* only MMC1 has a reset line */
44         if (mmc_instance) {
45                 sysconf = (unsigned long *)(STIH410_SYSCONF5_BASE +
46                           ST_MMC_CCONFIG_REG_5);
47                 generic_set_bit(SYSCONF_MMC1_ENABLE_BIT, sysconf);
48         }
49
50         writel(STI_FLASHSS_MMC_CORE_CONFIG_1,
51                regbase + FLASHSS_MMC_CORE_CONFIG_1);
52
53         if (mmc_instance) {
54                 writel(STI_FLASHSS_MMC_CORE_CONFIG2,
55                        regbase + FLASHSS_MMC_CORE_CONFIG_2);
56                 writel(STI_FLASHSS_MMC_CORE_CONFIG3,
57                        regbase + FLASHSS_MMC_CORE_CONFIG_3);
58         } else {
59                 writel(STI_FLASHSS_SDCARD_CORE_CONFIG2,
60                        regbase + FLASHSS_MMC_CORE_CONFIG_2);
61                 writel(STI_FLASHSS_SDCARD_CORE_CONFIG3,
62                        regbase + FLASHSS_MMC_CORE_CONFIG_3);
63         }
64         writel(STI_FLASHSS_MMC_CORE_CONFIG4,
65                regbase + FLASHSS_MMC_CORE_CONFIG_4);
66 }
67
68 static int sti_sdhci_probe(struct udevice *dev)
69 {
70         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
71         struct sti_sdhci_plat *plat = dev_get_platdata(dev);
72         struct sdhci_host *host = dev_get_priv(dev);
73         int ret, mmc_instance;
74
75         /*
76          * identify current mmc instance, mmc1 has a reset, not mmc0
77          * MMC0 is wired to the SD slot,
78          * MMC1 is wired on the high speed connector
79          */
80
81         if (fdt_getprop(gd->fdt_blob, dev_of_offset(dev), "resets", NULL))
82                 mmc_instance = 1;
83         else
84                 mmc_instance = 0;
85
86         sti_mmc_core_config((const u32) host->ioaddr, mmc_instance);
87
88         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
89                        SDHCI_QUIRK_32BIT_DMA_ADDR |
90                        SDHCI_QUIRK_NO_HISPD_BIT;
91
92         host->host_caps = MMC_MODE_DDR_52MHz;
93
94         ret = sdhci_setup_cfg(&plat->cfg, host, 50000000, 400000);
95         if (ret)
96                 return ret;
97
98         host->mmc = &plat->mmc;
99         host->mmc->priv = host;
100         host->mmc->dev = dev;
101         upriv->mmc = host->mmc;
102
103         return sdhci_probe(dev);
104 }
105
106 static int sti_sdhci_ofdata_to_platdata(struct udevice *dev)
107 {
108         struct sdhci_host *host = dev_get_priv(dev);
109
110         host->name = strdup(dev->name);
111         host->ioaddr = (void *)dev_get_addr(dev);
112
113         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
114                                          "bus-width", 4);
115
116         return 0;
117 }
118
119 static int sti_sdhci_bind(struct udevice *dev)
120 {
121         struct sti_sdhci_plat *plat = dev_get_platdata(dev);
122
123         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
124 }
125
126 static const struct udevice_id sti_sdhci_ids[] = {
127         { .compatible = "st,sdhci" },
128         { }
129 };
130
131 U_BOOT_DRIVER(sti_mmc) = {
132         .name = "sti_sdhci",
133         .id = UCLASS_MMC,
134         .of_match = sti_sdhci_ids,
135         .bind = sti_sdhci_bind,
136         .ops = &sdhci_ops,
137         .ofdata_to_platdata = sti_sdhci_ofdata_to_platdata,
138         .probe = sti_sdhci_probe,
139         .priv_auto_alloc_size = sizeof(struct sdhci_host),
140         .platdata_auto_alloc_size = sizeof(struct sti_sdhci_plat),
141 };