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 <dm.h> 11 #include <common.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 }; 81