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> 23308f3f8dSSuman Tripathi #include <linux/of_device.h> 2491aa3661SShawn Lin #include <linux/phy/phy.h> 25e3ec3a3dSSoren Brinkmann #include "sdhci-pltfm.h" 26e3ec3a3dSSoren Brinkmann 27e3ec3a3dSSoren Brinkmann #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c 28e3ec3a3dSSoren Brinkmann 29e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_SHIFT 16 30e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT) 31e3ec3a3dSSoren Brinkmann #define CLK_CTRL_TIMEOUT_MIN_EXP 13 32e3ec3a3dSSoren Brinkmann 33e3ec3a3dSSoren Brinkmann /** 34e3ec3a3dSSoren Brinkmann * struct sdhci_arasan_data 35e3ec3a3dSSoren Brinkmann * @clk_ahb: Pointer to the AHB clock 3691aa3661SShawn Lin * @phy: Pointer to the generic phy 37e3ec3a3dSSoren Brinkmann */ 38e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data { 39e3ec3a3dSSoren Brinkmann struct clk *clk_ahb; 4091aa3661SShawn Lin struct phy *phy; 41e3ec3a3dSSoren Brinkmann }; 42e3ec3a3dSSoren Brinkmann 43e3ec3a3dSSoren Brinkmann static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host) 44e3ec3a3dSSoren Brinkmann { 45e3ec3a3dSSoren Brinkmann u32 div; 46e3ec3a3dSSoren Brinkmann unsigned long freq; 47e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 48e3ec3a3dSSoren Brinkmann 49e3ec3a3dSSoren Brinkmann div = readl(host->ioaddr + SDHCI_ARASAN_CLK_CTRL_OFFSET); 50e3ec3a3dSSoren Brinkmann div = (div & CLK_CTRL_TIMEOUT_MASK) >> CLK_CTRL_TIMEOUT_SHIFT; 51e3ec3a3dSSoren Brinkmann 52e3ec3a3dSSoren Brinkmann freq = clk_get_rate(pltfm_host->clk); 53e3ec3a3dSSoren Brinkmann freq /= 1 << (CLK_CTRL_TIMEOUT_MIN_EXP + div); 54e3ec3a3dSSoren Brinkmann 55e3ec3a3dSSoren Brinkmann return freq; 56e3ec3a3dSSoren Brinkmann } 57e3ec3a3dSSoren Brinkmann 58802ac39aSShawn Lin static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) 59802ac39aSShawn Lin { 60802ac39aSShawn Lin struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 61802ac39aSShawn Lin struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); 62802ac39aSShawn Lin bool ctrl_phy = false; 63802ac39aSShawn Lin 64802ac39aSShawn Lin if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy))) 65802ac39aSShawn Lin ctrl_phy = true; 66802ac39aSShawn Lin 67802ac39aSShawn Lin if (ctrl_phy) { 68802ac39aSShawn Lin spin_unlock_irq(&host->lock); 69802ac39aSShawn Lin phy_power_off(sdhci_arasan->phy); 70802ac39aSShawn Lin spin_lock_irq(&host->lock); 71802ac39aSShawn Lin } 72802ac39aSShawn Lin 73802ac39aSShawn Lin sdhci_set_clock(host, clock); 74802ac39aSShawn Lin 75802ac39aSShawn Lin if (ctrl_phy) { 76802ac39aSShawn Lin spin_unlock_irq(&host->lock); 77802ac39aSShawn Lin phy_power_on(sdhci_arasan->phy); 78802ac39aSShawn Lin spin_lock_irq(&host->lock); 79802ac39aSShawn Lin } 80802ac39aSShawn Lin } 81802ac39aSShawn Lin 82e3ec3a3dSSoren Brinkmann static struct sdhci_ops sdhci_arasan_ops = { 83802ac39aSShawn Lin .set_clock = sdhci_arasan_set_clock, 84e3ec3a3dSSoren Brinkmann .get_max_clock = sdhci_pltfm_clk_get_max_clock, 85e3ec3a3dSSoren Brinkmann .get_timeout_clock = sdhci_arasan_get_timeout_clock, 862317f56cSRussell King .set_bus_width = sdhci_set_bus_width, 8703231f9bSRussell King .reset = sdhci_reset, 8896d7b78cSRussell King .set_uhs_signaling = sdhci_set_uhs_signaling, 89e3ec3a3dSSoren Brinkmann }; 90e3ec3a3dSSoren Brinkmann 91e3ec3a3dSSoren Brinkmann static struct sdhci_pltfm_data sdhci_arasan_pdata = { 92e3ec3a3dSSoren Brinkmann .ops = &sdhci_arasan_ops, 932d532d45SSuneel Garapati .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, 942d532d45SSuneel Garapati .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN | 952d532d45SSuneel Garapati SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN, 96e3ec3a3dSSoren Brinkmann }; 97e3ec3a3dSSoren Brinkmann 98e3ec3a3dSSoren Brinkmann #ifdef CONFIG_PM_SLEEP 99e3ec3a3dSSoren Brinkmann /** 100e3ec3a3dSSoren Brinkmann * sdhci_arasan_suspend - Suspend method for the driver 101e3ec3a3dSSoren Brinkmann * @dev: Address of the device structure 102e3ec3a3dSSoren Brinkmann * Returns 0 on success and error value on error 103e3ec3a3dSSoren Brinkmann * 104e3ec3a3dSSoren Brinkmann * Put the device in a low power state. 105e3ec3a3dSSoren Brinkmann */ 106e3ec3a3dSSoren Brinkmann static int sdhci_arasan_suspend(struct device *dev) 107e3ec3a3dSSoren Brinkmann { 108e3ec3a3dSSoren Brinkmann struct platform_device *pdev = to_platform_device(dev); 109e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 110e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 11189211418SJisheng Zhang struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); 112e3ec3a3dSSoren Brinkmann int ret; 113e3ec3a3dSSoren Brinkmann 114e3ec3a3dSSoren Brinkmann ret = sdhci_suspend_host(host); 115e3ec3a3dSSoren Brinkmann if (ret) 116e3ec3a3dSSoren Brinkmann return ret; 117e3ec3a3dSSoren Brinkmann 11891aa3661SShawn Lin if (!IS_ERR(sdhci_arasan->phy)) { 11991aa3661SShawn Lin ret = phy_power_off(sdhci_arasan->phy); 12091aa3661SShawn Lin if (ret) { 12191aa3661SShawn Lin dev_err(dev, "Cannot power off phy.\n"); 12291aa3661SShawn Lin sdhci_resume_host(host); 12391aa3661SShawn Lin return ret; 12491aa3661SShawn Lin } 12591aa3661SShawn Lin } 12691aa3661SShawn Lin 127e3ec3a3dSSoren Brinkmann clk_disable(pltfm_host->clk); 128e3ec3a3dSSoren Brinkmann clk_disable(sdhci_arasan->clk_ahb); 129e3ec3a3dSSoren Brinkmann 130e3ec3a3dSSoren Brinkmann return 0; 131e3ec3a3dSSoren Brinkmann } 132e3ec3a3dSSoren Brinkmann 133e3ec3a3dSSoren Brinkmann /** 134e3ec3a3dSSoren Brinkmann * sdhci_arasan_resume - Resume method for the driver 135e3ec3a3dSSoren Brinkmann * @dev: Address of the device structure 136e3ec3a3dSSoren Brinkmann * Returns 0 on success and error value on error 137e3ec3a3dSSoren Brinkmann * 138e3ec3a3dSSoren Brinkmann * Resume operation after suspend 139e3ec3a3dSSoren Brinkmann */ 140e3ec3a3dSSoren Brinkmann static int sdhci_arasan_resume(struct device *dev) 141e3ec3a3dSSoren Brinkmann { 142e3ec3a3dSSoren Brinkmann struct platform_device *pdev = to_platform_device(dev); 143e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 144e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 14589211418SJisheng Zhang struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); 146e3ec3a3dSSoren Brinkmann int ret; 147e3ec3a3dSSoren Brinkmann 148e3ec3a3dSSoren Brinkmann ret = clk_enable(sdhci_arasan->clk_ahb); 149e3ec3a3dSSoren Brinkmann if (ret) { 150e3ec3a3dSSoren Brinkmann dev_err(dev, "Cannot enable AHB clock.\n"); 151e3ec3a3dSSoren Brinkmann return ret; 152e3ec3a3dSSoren Brinkmann } 153e3ec3a3dSSoren Brinkmann 154e3ec3a3dSSoren Brinkmann ret = clk_enable(pltfm_host->clk); 155e3ec3a3dSSoren Brinkmann if (ret) { 156e3ec3a3dSSoren Brinkmann dev_err(dev, "Cannot enable SD clock.\n"); 157e3ec3a3dSSoren Brinkmann return ret; 158e3ec3a3dSSoren Brinkmann } 159e3ec3a3dSSoren Brinkmann 16091aa3661SShawn Lin if (!IS_ERR(sdhci_arasan->phy)) { 16191aa3661SShawn Lin ret = phy_power_on(sdhci_arasan->phy); 16291aa3661SShawn Lin if (ret) { 16391aa3661SShawn Lin dev_err(dev, "Cannot power on phy.\n"); 16491aa3661SShawn Lin return ret; 16591aa3661SShawn Lin } 16691aa3661SShawn Lin } 16791aa3661SShawn Lin 168e3ec3a3dSSoren Brinkmann return sdhci_resume_host(host); 169e3ec3a3dSSoren Brinkmann } 170e3ec3a3dSSoren Brinkmann #endif /* ! CONFIG_PM_SLEEP */ 171e3ec3a3dSSoren Brinkmann 172e3ec3a3dSSoren Brinkmann static SIMPLE_DEV_PM_OPS(sdhci_arasan_dev_pm_ops, sdhci_arasan_suspend, 173e3ec3a3dSSoren Brinkmann sdhci_arasan_resume); 174e3ec3a3dSSoren Brinkmann 175e3ec3a3dSSoren Brinkmann static int sdhci_arasan_probe(struct platform_device *pdev) 176e3ec3a3dSSoren Brinkmann { 177e3ec3a3dSSoren Brinkmann int ret; 178e3ec3a3dSSoren Brinkmann struct clk *clk_xin; 179e3ec3a3dSSoren Brinkmann struct sdhci_host *host; 180e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host; 181e3ec3a3dSSoren Brinkmann struct sdhci_arasan_data *sdhci_arasan; 182e3ec3a3dSSoren Brinkmann 18389211418SJisheng Zhang host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, 18489211418SJisheng Zhang sizeof(*sdhci_arasan)); 18589211418SJisheng Zhang if (IS_ERR(host)) 18689211418SJisheng Zhang return PTR_ERR(host); 18789211418SJisheng Zhang 18889211418SJisheng Zhang pltfm_host = sdhci_priv(host); 18989211418SJisheng Zhang sdhci_arasan = sdhci_pltfm_priv(pltfm_host); 190e3ec3a3dSSoren Brinkmann 191e3ec3a3dSSoren Brinkmann sdhci_arasan->clk_ahb = devm_clk_get(&pdev->dev, "clk_ahb"); 192e3ec3a3dSSoren Brinkmann if (IS_ERR(sdhci_arasan->clk_ahb)) { 193e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "clk_ahb clock not found.\n"); 194278d0962SShawn Lin ret = PTR_ERR(sdhci_arasan->clk_ahb); 195278d0962SShawn Lin goto err_pltfm_free; 196e3ec3a3dSSoren Brinkmann } 197e3ec3a3dSSoren Brinkmann 198e3ec3a3dSSoren Brinkmann clk_xin = devm_clk_get(&pdev->dev, "clk_xin"); 199e3ec3a3dSSoren Brinkmann if (IS_ERR(clk_xin)) { 200e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "clk_xin clock not found.\n"); 201278d0962SShawn Lin ret = PTR_ERR(clk_xin); 202278d0962SShawn Lin goto err_pltfm_free; 203e3ec3a3dSSoren Brinkmann } 204e3ec3a3dSSoren Brinkmann 205e3ec3a3dSSoren Brinkmann ret = clk_prepare_enable(sdhci_arasan->clk_ahb); 206e3ec3a3dSSoren Brinkmann if (ret) { 207e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "Unable to enable AHB clock.\n"); 208278d0962SShawn Lin goto err_pltfm_free; 209e3ec3a3dSSoren Brinkmann } 210e3ec3a3dSSoren Brinkmann 211e3ec3a3dSSoren Brinkmann ret = clk_prepare_enable(clk_xin); 212e3ec3a3dSSoren Brinkmann if (ret) { 213e3ec3a3dSSoren Brinkmann dev_err(&pdev->dev, "Unable to enable SD clock.\n"); 214e3ec3a3dSSoren Brinkmann goto clk_dis_ahb; 215e3ec3a3dSSoren Brinkmann } 216e3ec3a3dSSoren Brinkmann 217e3ec3a3dSSoren Brinkmann sdhci_get_of_property(pdev); 218e3ec3a3dSSoren Brinkmann pltfm_host->clk = clk_xin; 219e3ec3a3dSSoren Brinkmann 22016b23787SMichal Simek ret = mmc_of_parse(host->mmc); 22116b23787SMichal Simek if (ret) { 22216b23787SMichal Simek dev_err(&pdev->dev, "parsing dt failed (%u)\n", ret); 22316b23787SMichal Simek goto clk_disable_all; 22416b23787SMichal Simek } 22516b23787SMichal Simek 22691aa3661SShawn Lin sdhci_arasan->phy = ERR_PTR(-ENODEV); 22791aa3661SShawn Lin if (of_device_is_compatible(pdev->dev.of_node, 22891aa3661SShawn Lin "arasan,sdhci-5.1")) { 22991aa3661SShawn Lin sdhci_arasan->phy = devm_phy_get(&pdev->dev, 23091aa3661SShawn Lin "phy_arasan"); 23191aa3661SShawn Lin if (IS_ERR(sdhci_arasan->phy)) { 23291aa3661SShawn Lin ret = PTR_ERR(sdhci_arasan->phy); 23391aa3661SShawn Lin dev_err(&pdev->dev, "No phy for arasan,sdhci-5.1.\n"); 23491aa3661SShawn Lin goto clk_disable_all; 23591aa3661SShawn Lin } 23691aa3661SShawn Lin 23791aa3661SShawn Lin ret = phy_init(sdhci_arasan->phy); 23891aa3661SShawn Lin if (ret < 0) { 23991aa3661SShawn Lin dev_err(&pdev->dev, "phy_init err.\n"); 24091aa3661SShawn Lin goto clk_disable_all; 24191aa3661SShawn Lin } 24291aa3661SShawn Lin 24391aa3661SShawn Lin ret = phy_power_on(sdhci_arasan->phy); 24491aa3661SShawn Lin if (ret < 0) { 24591aa3661SShawn Lin dev_err(&pdev->dev, "phy_power_on err.\n"); 24691aa3661SShawn Lin goto err_phy_power; 24791aa3661SShawn Lin } 24891aa3661SShawn Lin } 24991aa3661SShawn Lin 250e3ec3a3dSSoren Brinkmann ret = sdhci_add_host(host); 251b1df9de7SMike Looijmans if (ret) 25291aa3661SShawn Lin goto err_add_host; 253e3ec3a3dSSoren Brinkmann 254e3ec3a3dSSoren Brinkmann return 0; 255e3ec3a3dSSoren Brinkmann 25691aa3661SShawn Lin err_add_host: 25791aa3661SShawn Lin if (!IS_ERR(sdhci_arasan->phy)) 25891aa3661SShawn Lin phy_power_off(sdhci_arasan->phy); 25991aa3661SShawn Lin err_phy_power: 26091aa3661SShawn Lin if (!IS_ERR(sdhci_arasan->phy)) 26191aa3661SShawn Lin phy_exit(sdhci_arasan->phy); 262e3ec3a3dSSoren Brinkmann clk_disable_all: 263e3ec3a3dSSoren Brinkmann clk_disable_unprepare(clk_xin); 264e3ec3a3dSSoren Brinkmann clk_dis_ahb: 265e3ec3a3dSSoren Brinkmann clk_disable_unprepare(sdhci_arasan->clk_ahb); 266278d0962SShawn Lin err_pltfm_free: 267278d0962SShawn Lin sdhci_pltfm_free(pdev); 268e3ec3a3dSSoren Brinkmann return ret; 269e3ec3a3dSSoren Brinkmann } 270e3ec3a3dSSoren Brinkmann 271e3ec3a3dSSoren Brinkmann static int sdhci_arasan_remove(struct platform_device *pdev) 272e3ec3a3dSSoren Brinkmann { 2730c7fe32eSJisheng Zhang int ret; 274e3ec3a3dSSoren Brinkmann struct sdhci_host *host = platform_get_drvdata(pdev); 275e3ec3a3dSSoren Brinkmann struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); 27689211418SJisheng Zhang struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); 27789211418SJisheng Zhang struct clk *clk_ahb = sdhci_arasan->clk_ahb; 278e3ec3a3dSSoren Brinkmann 27991aa3661SShawn Lin if (!IS_ERR(sdhci_arasan->phy)) { 28091aa3661SShawn Lin phy_power_off(sdhci_arasan->phy); 28191aa3661SShawn Lin phy_exit(sdhci_arasan->phy); 28291aa3661SShawn Lin } 28391aa3661SShawn Lin 2840c7fe32eSJisheng Zhang ret = sdhci_pltfm_unregister(pdev); 2850c7fe32eSJisheng Zhang 28689211418SJisheng Zhang clk_disable_unprepare(clk_ahb); 287e3ec3a3dSSoren Brinkmann 2880c7fe32eSJisheng Zhang return ret; 289e3ec3a3dSSoren Brinkmann } 290e3ec3a3dSSoren Brinkmann 291e3ec3a3dSSoren Brinkmann static const struct of_device_id sdhci_arasan_of_match[] = { 292e3ec3a3dSSoren Brinkmann { .compatible = "arasan,sdhci-8.9a" }, 293da795ec2SShawn Lin { .compatible = "arasan,sdhci-5.1" }, 294308f3f8dSSuman Tripathi { .compatible = "arasan,sdhci-4.9a" }, 295e3ec3a3dSSoren Brinkmann { } 296e3ec3a3dSSoren Brinkmann }; 297e3ec3a3dSSoren Brinkmann MODULE_DEVICE_TABLE(of, sdhci_arasan_of_match); 298e3ec3a3dSSoren Brinkmann 299e3ec3a3dSSoren Brinkmann static struct platform_driver sdhci_arasan_driver = { 300e3ec3a3dSSoren Brinkmann .driver = { 301e3ec3a3dSSoren Brinkmann .name = "sdhci-arasan", 302e3ec3a3dSSoren Brinkmann .of_match_table = sdhci_arasan_of_match, 303e3ec3a3dSSoren Brinkmann .pm = &sdhci_arasan_dev_pm_ops, 304e3ec3a3dSSoren Brinkmann }, 305e3ec3a3dSSoren Brinkmann .probe = sdhci_arasan_probe, 306e3ec3a3dSSoren Brinkmann .remove = sdhci_arasan_remove, 307e3ec3a3dSSoren Brinkmann }; 308e3ec3a3dSSoren Brinkmann 309e3ec3a3dSSoren Brinkmann module_platform_driver(sdhci_arasan_driver); 310e3ec3a3dSSoren Brinkmann 311e3ec3a3dSSoren Brinkmann MODULE_DESCRIPTION("Driver for the Arasan SDHCI Controller"); 312e3ec3a3dSSoren Brinkmann MODULE_AUTHOR("Soeren Brinkmann <soren.brinkmann@xilinx.com>"); 313e3ec3a3dSSoren Brinkmann MODULE_LICENSE("GPL"); 314