212e22ee0215c6ff617ede8a024f78ebcf1e1fc1
[oweals/u-boot.git] / drivers / mmc / pic32_sdhci.c
1 /*
2  * Support of SDHCI for Microchip PIC32 SoC.
3  *
4  * Copyright (C) 2015 Microchip Technology Inc.
5  * Andrei Pistirica <andrei.pistirica@microchip.com>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <dm.h>
12 #include <sdhci.h>
13 #include <linux/errno.h>
14 #include <mach/pic32.h>
15
16 DECLARE_GLOBAL_DATA_PTR;
17
18 static int pic32_sdhci_get_cd(struct sdhci_host *host)
19 {
20         /* PIC32 SDHCI CD errata:
21          * - set CD_TEST and clear CD_TEST_INS bit
22          */
23         sdhci_writeb(host, SDHCI_CTRL_CD_TEST, SDHCI_HOST_CONTROL);
24
25         return 0;
26 }
27
28 static const struct sdhci_ops pic32_sdhci_ops = {
29         .get_cd = pic32_sdhci_get_cd,
30 };
31
32 static int pic32_sdhci_probe(struct udevice *dev)
33 {
34         struct sdhci_host *host = dev_get_priv(dev);
35         const void *fdt = gd->fdt_blob;
36         u32 f_min_max[2];
37         fdt_addr_t addr;
38         fdt_size_t size;
39         int ret;
40
41         addr = fdtdec_get_addr_size(fdt, dev_of_offset(dev), "reg", &size);
42         if (addr == FDT_ADDR_T_NONE)
43                 return -EINVAL;
44
45         host->ioaddr    = ioremap(addr, size);
46         host->name      = dev->name;
47         host->quirks    = SDHCI_QUIRK_NO_HISPD_BIT;
48         host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
49                                         "bus-width", 4);
50         host->ops = &pic32_sdhci_ops;
51
52         ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
53                                    "clock-freq-min-max", f_min_max, 2);
54         if (ret) {
55                 printf("sdhci: clock-freq-min-max not found\n");
56                 return ret;
57         }
58
59         host->max_clk   = f_min_max[1];
60
61         ret = add_sdhci(host, 0, f_min_max[0]);
62         if (ret)
63                 return ret;
64         host->mmc->dev = dev;
65
66         return 0;
67 }
68
69 static const struct udevice_id pic32_sdhci_ids[] = {
70         { .compatible = "microchip,pic32mzda-sdhci" },
71         { }
72 };
73
74 U_BOOT_DRIVER(pic32_sdhci_drv) = {
75         .name                   = "pic32_sdhci",
76         .id                     = UCLASS_MMC,
77         .of_match               = pic32_sdhci_ids,
78         .probe                  = pic32_sdhci_probe,
79         .priv_auto_alloc_size   = sizeof(struct sdhci_host),
80 };