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 #ifdef CONFIG_PM_SLEEP 25 26 static int sdhci_brcmstb_suspend(struct device *dev) 27 { 28 struct sdhci_host *host = dev_get_drvdata(dev); 29 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 30 int res; 31 32 if (host->tuning_mode != SDHCI_TUNING_MODE_3) 33 mmc_retune_needed(host->mmc); 34 35 res = sdhci_suspend_host(host); 36 if (res) 37 return res; 38 clk_disable_unprepare(pltfm_host->clk); 39 return res; 40 } 41 42 static int sdhci_brcmstb_resume(struct device *dev) 43 { 44 struct sdhci_host *host = dev_get_drvdata(dev); 45 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 46 int err; 47 48 err = clk_prepare_enable(pltfm_host->clk); 49 if (err) 50 return err; 51 return sdhci_resume_host(host); 52 } 53 54 #endif /* CONFIG_PM_SLEEP */ 55 56 static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend, 57 sdhci_brcmstb_resume); 58 59 static const struct sdhci_ops sdhci_brcmstb_ops = { 60 .set_clock = sdhci_set_clock, 61 .set_bus_width = sdhci_set_bus_width, 62 .reset = sdhci_reset, 63 .set_uhs_signaling = sdhci_set_uhs_signaling, 64 }; 65 66 static struct sdhci_pltfm_data sdhci_brcmstb_pdata = { 67 .ops = &sdhci_brcmstb_ops, 68 }; 69 70 static int sdhci_brcmstb_probe(struct platform_device *pdev) 71 { 72 struct sdhci_host *host; 73 struct sdhci_pltfm_host *pltfm_host; 74 struct clk *clk; 75 int res; 76 77 clk = devm_clk_get(&pdev->dev, NULL); 78 if (IS_ERR(clk)) { 79 dev_err(&pdev->dev, "Clock not found in Device Tree\n"); 80 clk = NULL; 81 } 82 res = clk_prepare_enable(clk); 83 if (res) 84 return res; 85 86 host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0); 87 if (IS_ERR(host)) { 88 res = PTR_ERR(host); 89 goto err_clk; 90 } 91 92 /* Enable MMC_CAP2_HC_ERASE_SZ for better max discard calculations */ 93 host->mmc->caps2 |= MMC_CAP2_HC_ERASE_SZ; 94 95 sdhci_get_of_property(pdev); 96 mmc_of_parse(host->mmc); 97 98 /* 99 * Supply the existing CAPS, but clear the UHS modes. This 100 * will allow these modes to be specified by device tree 101 * properties through mmc_of_parse(). 102 */ 103 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES); 104 if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci")) 105 host->caps &= ~SDHCI_CAN_64BIT; 106 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); 107 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 | 108 SDHCI_SUPPORT_DDR50); 109 host->quirks |= SDHCI_QUIRK_MISSING_CAPS | 110 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; 111 112 res = sdhci_add_host(host); 113 if (res) 114 goto err; 115 116 pltfm_host = sdhci_priv(host); 117 pltfm_host->clk = clk; 118 return res; 119 120 err: 121 sdhci_pltfm_free(pdev); 122 err_clk: 123 clk_disable_unprepare(clk); 124 return res; 125 } 126 127 static const struct of_device_id sdhci_brcm_of_match[] = { 128 { .compatible = "brcm,bcm7425-sdhci" }, 129 { .compatible = "brcm,bcm7445-sdhci" }, 130 {}, 131 }; 132 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match); 133 134 static struct platform_driver sdhci_brcmstb_driver = { 135 .driver = { 136 .name = "sdhci-brcmstb", 137 .pm = &sdhci_brcmstb_pmops, 138 .of_match_table = of_match_ptr(sdhci_brcm_of_match), 139 }, 140 .probe = sdhci_brcmstb_probe, 141 .remove = sdhci_pltfm_unregister, 142 }; 143 144 module_platform_driver(sdhci_brcmstb_driver); 145 146 MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs"); 147 MODULE_AUTHOR("Broadcom"); 148 MODULE_LICENSE("GPL v2"); 149