1 /* 2 * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's 3 * 4 * Copyright (C) 2015 Broadcom Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 */ 16 17 #include <linux/io.h> 18 #include <linux/mmc/host.h> 19 #include <linux/module.h> 20 #include <linux/of.h> 21 22 #include "sdhci-pltfm.h" 23 24 static const struct sdhci_ops sdhci_brcmstb_ops = { 25 .set_clock = sdhci_set_clock, 26 .set_bus_width = sdhci_set_bus_width, 27 .reset = sdhci_reset, 28 .set_uhs_signaling = sdhci_set_uhs_signaling, 29 }; 30 31 static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = { 32 .ops = &sdhci_brcmstb_ops, 33 }; 34 35 static int sdhci_brcmstb_probe(struct platform_device *pdev) 36 { 37 struct sdhci_host *host; 38 struct sdhci_pltfm_host *pltfm_host; 39 struct clk *clk; 40 int res; 41 42 clk = devm_clk_get(&pdev->dev, NULL); 43 if (IS_ERR(clk)) { 44 dev_err(&pdev->dev, "Clock not found in Device Tree\n"); 45 clk = NULL; 46 } 47 res = clk_prepare_enable(clk); 48 if (res) 49 return res; 50 51 host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0); 52 if (IS_ERR(host)) { 53 res = PTR_ERR(host); 54 goto err_clk; 55 } 56 57 sdhci_get_of_property(pdev); 58 mmc_of_parse(host->mmc); 59 60 /* 61 * Supply the existing CAPS, but clear the UHS modes. This 62 * will allow these modes to be specified by device tree 63 * properties through mmc_of_parse(). 64 */ 65 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); 66 if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci")) 67 host->caps &= ~SDHCI_CAN_64BIT; 68 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); 69 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 | 70 SDHCI_SUPPORT_DDR50); 71 host->quirks |= SDHCI_QUIRK_MISSING_CAPS | 72 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 73 74 res = sdhci_add_host(host); 75 if (res) 76 goto err; 77 78 pltfm_host = sdhci_priv(host); 79 pltfm_host->clk = clk; 80 return res; 81 82 err: 83 sdhci_pltfm_free(pdev); 84 err_clk: 85 clk_disable_unprepare(clk); 86 return res; 87 } 88 89 static const struct of_device_id sdhci_brcm_of_match[] = { 90 { .compatible = "brcm,bcm7425-sdhci" }, 91 { .compatible = "brcm,bcm7445-sdhci" }, 92 {}, 93 }; 94 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match); 95 96 static struct platform_driver sdhci_brcmstb_driver = { 97 .driver = { 98 .name = "sdhci-brcmstb", 99 .pm = &sdhci_pltfm_pmops, 100 .of_match_table = of_match_ptr(sdhci_brcm_of_match), 101 }, 102 .probe = sdhci_brcmstb_probe, 103 .remove = sdhci_pltfm_unregister, 104 }; 105 106 module_platform_driver(sdhci_brcmstb_driver); 107 108 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs"); 109 MODULE_AUTHOR("Broadcom"); 110 MODULE_LICENSE("GPL v2"); 111