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