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