1e3ec3a3dSSoren Brinkmann /* 2e3ec3a3dSSoren Brinkmann * Arasan Secure Digital Host Controller Interface. 3e3ec3a3dSSoren Brinkmann * Copyright (C) 2011 - 2012 Michal Simek <monstr@monstr.eu> 4e3ec3a3dSSoren Brinkmann * Copyright (c) 2012 Wind River Systems, Inc. 5e3ec3a3dSSoren Brinkmann * Copyright (C) 2013 Pengutronix e.K. 6e3ec3a3dSSoren Brinkmann * Copyright (C) 2013 Xilinx Inc. 7e3ec3a3dSSoren Brinkmann * 8e3ec3a3dSSoren Brinkmann * Based on sdhci-of-esdhc.c 9e3ec3a3dSSoren Brinkmann * 10e3ec3a3dSSoren Brinkmann * Copyright (c) 2007 Freescale Semiconductor, Inc. 11e3ec3a3dSSoren Brinkmann * Copyright (c) 2009 MontaVista Software, Inc. 12e3ec3a3dSSoren Brinkmann * 13e3ec3a3dSSoren Brinkmann * Authors: Xiaobo Xie <X.Xie@freescale.com> 14e3ec3a3dSSoren Brinkmann * Anton Vorontsov <avorontsov@ru.mvista.com> 15e3ec3a3dSSoren Brinkmann * 16e3ec3a3dSSoren Brinkmann * This program is free software; you can redistribute it and/or modify 17e3ec3a3dSSoren Brinkmann * it under the terms of the GNU General Public License as published by 18e3ec3a3dSSoren Brinkmann * the Free Software Foundation; either version 2 of the License, or (at 19e3ec3a3dSSoren Brinkmann * your option) any later version. 20e3ec3a3dSSoren Brinkmann */ 21e3ec3a3dSSoren Brinkmann 22e3ec3a3dSSoren Brinkmann #include <linux/module.h> 23e3ec3a3dSSoren Brinkmann #include "sdhci-pltfm.h" 24e3ec3a3dSSoren Brinkmann 25e3ec3a3dSSoren Brinkmann #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c 26e3ec3a3dSSoren Brinkmann 27e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_SHIFT 16 28e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT) 29e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_MIN_EXP 13 30e3ec3a3dSSoren Brinkmann 31e3ec3a3dSSoren Brinkmann /** 32e3ec3a3dSSoren Brinkmann * struct sdhci_arasan_data 33e3ec3a3dSSoren Brinkmann * @clk_ahb: Pointer to the AHB clock 34e3ec3a3dSSoren Brinkmann */ 35e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data { 36e3ec3a3dSSoren Brinkmann struct clk *clk_ahb; 37e3ec3a3dSSoren Brinkmann }; 38e3ec3a3dSSoren Brinkmann 39e3ec3a3dSSoren Brinkmann static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host) 40e3ec3a3dSSoren Brinkmann { 41e3ec3a3dSSoren Brinkmann u32 div; 42e3ec3a3dSSoren Brinkmann unsigned long freq; 43e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 44e3ec3a3dSSoren Brinkmann 45e3ec3a3dSSoren Brinkmann div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET); 46e3ec3a3dSSoren Brinkmann div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT; 47e3ec3a3dSSoren Brinkmann 48e3ec3a3dSSoren Brinkmann freq = clk_get_rate(pltfm_host->clk); 49e3ec3a3dSSoren Brinkmann freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div); 50e3ec3a3dSSoren Brinkmann 51e3ec3a3dSSoren Brinkmann return freq; 52e3ec3a3dSSoren Brinkmann } 53e3ec3a3dSSoren Brinkmann 54e3ec3a3dSSoren Brinkmann static struct sdhci_ops sdhci_arasan_ops = { 551771059cSRussell King .set_clock = sdhci_set_clock, 56e3ec3a3dSSoren Brinkmann .get_max_clock = sdhci_pltfm_clk_get_max_clock, 57e3ec3a3dSSoren Brinkmann .get_timeout_clock = sdhci_arasan_get_timeout_clock, 582317f56cSRussell King .set_bus_width = sdhci_set_bus_width, 5903231f9bSRussell King .reset = sdhci_reset, 6096d7b78cSRussell King .set_uhs_signaling = sdhci_set_uhs_signaling, 61e3ec3a3dSSoren Brinkmann }; 62e3ec3a3dSSoren Brinkmann 63e3ec3a3dSSoren Brinkmann static struct sdhci_pltfm_data sdhci_arasan_pdata = { 64e3ec3a3dSSoren Brinkmann .ops = &sdhci_arasan_ops, 65e3ec3a3dSSoren Brinkmann }; 66e3ec3a3dSSoren Brinkmann 67e3ec3a3dSSoren Brinkmann #ifdef CONFIG_PM_SLEEP 68e3ec3a3dSSoren Brinkmann /** 69e3ec3a3dSSoren Brinkmann * sdhci_arasan_suspend - Suspend method for the driver 70e3ec3a3dSSoren Brinkmann * @dev: Address of the device structure 71e3ec3a3dSSoren Brinkmann * Returns 0 on success and error value on error 72e3ec3a3dSSoren Brinkmann * 73e3ec3a3dSSoren Brinkmann * Put the device in a low power state. 74e3ec3a3dSSoren Brinkmann */ 75e3ec3a3dSSoren Brinkmann static int sdhci_arasan_suspend(struct device *dev) 76e3ec3a3dSSoren Brinkmann { 77e3ec3a3dSSoren Brinkmann struct platform_device *pdev = to_platform_device(dev); 78e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 79e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 80e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv; 81e3ec3a3dSSoren Brinkmann int ret; 82e3ec3a3dSSoren Brinkmann 83e3ec3a3dSSoren Brinkmann ret = sdhci_suspend_host(host); 84e3ec3a3dSSoren Brinkmann if (ret) 85e3ec3a3dSSoren Brinkmann return ret; 86e3ec3a3dSSoren Brinkmann 87e3ec3a3dSSoren Brinkmann clk_disable(pltfm_host->clk); 88e3ec3a3dSSoren Brinkmann clk_disable(sdhci_arasan->clk_ahb); 89e3ec3a3dSSoren Brinkmann 90e3ec3a3dSSoren Brinkmann return 0; 91e3ec3a3dSSoren Brinkmann } 92e3ec3a3dSSoren Brinkmann 93e3ec3a3dSSoren Brinkmann /** 94e3ec3a3dSSoren Brinkmann * sdhci_arasan_resume - Resume method for the driver 95e3ec3a3dSSoren Brinkmann * @dev: Address of the device structure 96e3ec3a3dSSoren Brinkmann * Returns 0 on success and error value on error 97e3ec3a3dSSoren Brinkmann * 98e3ec3a3dSSoren Brinkmann * Resume operation after suspend 99e3ec3a3dSSoren Brinkmann */ 100e3ec3a3dSSoren Brinkmann static int sdhci_arasan_resume(struct device *dev) 101e3ec3a3dSSoren Brinkmann { 102e3ec3a3dSSoren Brinkmann struct platform_device *pdev = to_platform_device(dev); 103e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 104e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 105e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv; 106e3ec3a3dSSoren Brinkmann int ret; 107e3ec3a3dSSoren Brinkmann 108e3ec3a3dSSoren Brinkmann ret = clk_enable(sdhci_arasan->clk_ahb); 109e3ec3a3dSSoren Brinkmann if (ret) { 110e3ec3a3dSSoren Brinkmann dev_err(dev, "Cannot enable AHB clock.\n"); 111e3ec3a3dSSoren Brinkmann return ret; 112e3ec3a3dSSoren Brinkmann } 113e3ec3a3dSSoren Brinkmann 114e3ec3a3dSSoren Brinkmann ret = clk_enable(pltfm_host->clk); 115e3ec3a3dSSoren Brinkmann if (ret) { 116e3ec3a3dSSoren Brinkmann dev_err(dev, "Cannot enable SD clock.\n"); 117e3ec3a3dSSoren Brinkmann clk_disable(sdhci_arasan->clk_ahb); 118e3ec3a3dSSoren Brinkmann return ret; 119e3ec3a3dSSoren Brinkmann } 120e3ec3a3dSSoren Brinkmann 121e3ec3a3dSSoren Brinkmann return sdhci_resume_host(host); 122e3ec3a3dSSoren Brinkmann } 123e3ec3a3dSSoren Brinkmann #endif /* ! CONFIG_PM_SLEEP */ 124e3ec3a3dSSoren Brinkmann 125e3ec3a3dSSoren Brinkmann static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend, 126e3ec3a3dSSoren Brinkmann sdhci_arasan_resume); 127e3ec3a3dSSoren Brinkmann 128e3ec3a3dSSoren Brinkmann static int sdhci_arasan_probe(struct platform_device *pdev) 129e3ec3a3dSSoren Brinkmann { 130e3ec3a3dSSoren Brinkmann int ret; 131e3ec3a3dSSoren Brinkmann struct clk *clk_xin; 132e3ec3a3dSSoren Brinkmann struct sdhci_host *host; 133e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host; 134e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data *sdhci_arasan; 135e3ec3a3dSSoren Brinkmann 136e3ec3a3dSSoren Brinkmann sdhci_arasan = devm_kzalloc(&pdev->dev, sizeof(*sdhci_arasan), 137e3ec3a3dSSoren Brinkmann GFP_KERNEL); 138e3ec3a3dSSoren Brinkmann if (!sdhci_arasan) 139e3ec3a3dSSoren Brinkmann return -ENOMEM; 140e3ec3a3dSSoren Brinkmann 141e3ec3a3dSSoren Brinkmann sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb"); 142e3ec3a3dSSoren Brinkmann if (IS_ERR(sdhci_arasan->clk_ahb)) { 143e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "clk_ahb clock not found.\n"); 144e3ec3a3dSSoren Brinkmann return PTR_ERR(sdhci_arasan->clk_ahb); 145e3ec3a3dSSoren Brinkmann } 146e3ec3a3dSSoren Brinkmann 147e3ec3a3dSSoren Brinkmann clk_xin = devm_clk_get(&pdev->dev, "clk_xin"); 148e3ec3a3dSSoren Brinkmann if (IS_ERR(clk_xin)) { 149e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "clk_xin clock not found.\n"); 150e3ec3a3dSSoren Brinkmann return PTR_ERR(clk_xin); 151e3ec3a3dSSoren Brinkmann } 152e3ec3a3dSSoren Brinkmann 153e3ec3a3dSSoren Brinkmann ret = clk_prepare_enable(sdhci_arasan->clk_ahb); 154e3ec3a3dSSoren Brinkmann if (ret) { 155e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "Unable to enable AHB clock.\n"); 156e3ec3a3dSSoren Brinkmann return ret; 157e3ec3a3dSSoren Brinkmann } 158e3ec3a3dSSoren Brinkmann 159e3ec3a3dSSoren Brinkmann ret = clk_prepare_enable(clk_xin); 160e3ec3a3dSSoren Brinkmann if (ret) { 161e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "Unable to enable SD clock.\n"); 162e3ec3a3dSSoren Brinkmann goto clk_dis_ahb; 163e3ec3a3dSSoren Brinkmann } 164e3ec3a3dSSoren Brinkmann 165e3ec3a3dSSoren Brinkmann host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 0); 166e3ec3a3dSSoren Brinkmann if (IS_ERR(host)) { 167e3ec3a3dSSoren Brinkmann ret = PTR_ERR(host); 168e3ec3a3dSSoren Brinkmann goto clk_disable_all; 169e3ec3a3dSSoren Brinkmann } 170e3ec3a3dSSoren Brinkmann 171e3ec3a3dSSoren Brinkmann sdhci_get_of_property(pdev); 172e3ec3a3dSSoren Brinkmann pltfm_host = sdhci_priv(host); 173e3ec3a3dSSoren Brinkmann pltfm_host->priv = sdhci_arasan; 174e3ec3a3dSSoren Brinkmann pltfm_host->clk = clk_xin; 175e3ec3a3dSSoren Brinkmann 17616b23787SMichal Simek ret = mmc_of_parse(host->mmc); 17716b23787SMichal Simek if (ret) { 17816b23787SMichal Simek dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret); 17916b23787SMichal Simek goto clk_disable_all; 18016b23787SMichal Simek } 18116b23787SMichal Simek 182e3ec3a3dSSoren Brinkmann ret = sdhci_add_host(host); 183b1df9de7SMike Looijmans if (ret) 184e3ec3a3dSSoren Brinkmann goto err_pltfm_free; 185e3ec3a3dSSoren Brinkmann 186e3ec3a3dSSoren Brinkmann return 0; 187e3ec3a3dSSoren Brinkmann 188e3ec3a3dSSoren Brinkmann err_pltfm_free: 189e3ec3a3dSSoren Brinkmann sdhci_pltfm_free(pdev); 190e3ec3a3dSSoren Brinkmann clk_disable_all: 191e3ec3a3dSSoren Brinkmann clk_disable_unprepare(clk_xin); 192e3ec3a3dSSoren Brinkmann clk_dis_ahb: 193e3ec3a3dSSoren Brinkmann clk_disable_unprepare(sdhci_arasan->clk_ahb); 194e3ec3a3dSSoren Brinkmann 195e3ec3a3dSSoren Brinkmann return ret; 196e3ec3a3dSSoren Brinkmann } 197e3ec3a3dSSoren Brinkmann 198e3ec3a3dSSoren Brinkmann static int sdhci_arasan_remove(struct platform_device *pdev) 199e3ec3a3dSSoren Brinkmann { 200e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 201e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 202e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data *sdhci_arasan = pltfm_host->priv; 203e3ec3a3dSSoren Brinkmann 204e3ec3a3dSSoren Brinkmann clk_disable_unprepare(sdhci_arasan->clk_ahb); 205e3ec3a3dSSoren Brinkmann 206e3ec3a3dSSoren Brinkmann return sdhci_pltfm_unregister(pdev); 207e3ec3a3dSSoren Brinkmann } 208e3ec3a3dSSoren Brinkmann 209e3ec3a3dSSoren Brinkmann static const struct of_device_id sdhci_arasan_of_match[] = { 210e3ec3a3dSSoren Brinkmann { .compatible = "arasan,sdhci-8.9a" }, 211e3ec3a3dSSoren Brinkmann { } 212e3ec3a3dSSoren Brinkmann }; 213e3ec3a3dSSoren Brinkmann MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match); 214e3ec3a3dSSoren Brinkmann 215e3ec3a3dSSoren Brinkmann static struct platform_driver sdhci_arasan_driver = { 216e3ec3a3dSSoren Brinkmann .driver = { 217e3ec3a3dSSoren Brinkmann .name = "sdhci-arasan", 218e3ec3a3dSSoren Brinkmann .of_match_table = sdhci_arasan_of_match, 219e3ec3a3dSSoren Brinkmann .pm = &sdhci_arasan_dev_pm_ops, 220e3ec3a3dSSoren Brinkmann }, 221e3ec3a3dSSoren Brinkmann .probe = sdhci_arasan_probe, 222e3ec3a3dSSoren Brinkmann .remove = sdhci_arasan_remove, 223e3ec3a3dSSoren Brinkmann }; 224e3ec3a3dSSoren Brinkmann 225e3ec3a3dSSoren Brinkmann module_platform_driver(sdhci_arasan_driver); 226e3ec3a3dSSoren Brinkmann 227e3ec3a3dSSoren Brinkmann MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller"); 228e3ec3a3dSSoren Brinkmann MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>"); 229e3ec3a3dSSoren Brinkmann MODULE_LICENSE("GPL"); 230