1 files changed, 104 insertions, 61 deletions

diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
index a0b5089b3274..046e8100dd08 100644
--- a/drivers/mmc/host/sdhci-xenon.c
+++ b/drivers/mmc/host/sdhci-xenon.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for Marvell Xenon SDHC as a platform device
  *
@@ -6,20 +7,19 @@
  * Author:	Hu Ziji <huziji@marvell.com>
  * Date:	2016-8-24
  *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
  * Inspired by Jisheng Zhang <jszhang@marvell.com>
  * Special thanks to Video BG4 project team.
  */
 
+#include <linux/acpi.h>
 #include <linux/delay.h>
 #include <linux/ktime.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
 
 #include "sdhci-pltfm.h"
 #include "sdhci-xenon.h"
@@ -170,7 +170,12 @@ static void xenon_reset_exit(struct sdhci_host *host,
 	/* Disable tuning request and auto-retuning again */
 	xenon_retune_setup(host);
 
-	xenon_set_acg(host, true);
+	/*
+	 * The ACG should be turned off at the early init time, in order
+	 * to solve a possible issues with the 1.8V regulator stabilization.
+	 * The feature is enabled in later stage.
+	 */
+	xenon_set_acg(host, false);
 
 	xenon_set_sdclk_off_idle(host, sdhc_id, false);
 
@@ -240,6 +245,16 @@ static void xenon_voltage_switch(struct sdhci_host *host)
 	usleep_range(5000, 5500);
 }
 
+static unsigned int xenon_get_max_clock(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+
+	if (pltfm_host->clk)
+		return sdhci_pltfm_clk_get_max_clock(host);
+	else
+		return pltfm_host->clock;
+}
+
 static const struct sdhci_ops sdhci_xenon_ops = {
 	.voltage_switch		= xenon_voltage_switch,
 	.set_clock		= sdhci_set_clock,
@@ -247,7 +262,7 @@ static const struct sdhci_ops sdhci_xenon_ops = {
 	.set_bus_width		= sdhci_set_bus_width,
 	.reset			= xenon_reset,
 	.set_uhs_signaling	= xenon_set_uhs_signaling,
-	.get_max_clock		= sdhci_pltfm_clk_get_max_clock,
+	.get_max_clock		= xenon_get_max_clock,
 };
 
 static const struct sdhci_pltfm_data sdhci_xenon_pdata = {
@@ -400,22 +415,23 @@ static void xenon_replace_mmc_host_ops(struct sdhci_host *host)
  *	    Refer to XENON_SYS_CFG_INFO register
  * tun-count: the interval between re-tuning
  */
-static int xenon_probe_dt(struct platform_device *pdev)
+static int xenon_probe_params(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct mmc_host *mmc = host->mmc;
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
 	u32 sdhc_id, nr_sdhc;
 	u32 tuning_count;
+	struct sysinfo si;
 
 	/* Disable HS200 on Armada AP806 */
-	if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))
+	if (priv->hw_version == XENON_AP806)
 		host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
 
 	sdhc_id = 0x0;
-	if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {
+	if (!device_property_read_u32(dev, "marvell,xenon-sdhc-id", &sdhc_id)) {
 		nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);
 		nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK;
 		if (unlikely(sdhc_id > nr_sdhc)) {
@@ -427,8 +443,8 @@ static int xenon_probe_dt(struct platform_device *pdev)
 	priv->sdhc_id = sdhc_id;
 
 	tuning_count = XENON_DEF_TUNING_COUNT;
-	if (!of_property_read_u32(np, "marvell,xenon-tun-count",
-				  &tuning_count)) {
+	if (!device_property_read_u32(dev, "marvell,xenon-tun-count",
+				      &tuning_count)) {
 		if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) {
 			dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",
 				XENON_DEF_TUNING_COUNT);
@@ -437,7 +453,24 @@ static int xenon_probe_dt(struct platform_device *pdev)
 	}
 	priv->tuning_count = tuning_count;
 
-	return xenon_phy_parse_dt(np, host);
+	/*
+	 * AC5/X/IM HW has only 31-bits passed in the crossbar switch.
+	 * If we have more than 2GB of memory, this means we might pass
+	 * memory pointers which are above 2GB and which cannot be properly
+	 * represented. In this case, disable ADMA, 64-bit DMA and allow only SDMA.
+	 * This effectively will enable bounce buffer quirk in the
+	 * generic SDHCI driver, which will make sure DMA is only done
+	 * from supported memory regions:
+	 */
+	if (priv->hw_version == XENON_AC5) {
+		si_meminfo(&si);
+		if (si.totalram * si.mem_unit > SZ_2G) {
+			host->quirks |= SDHCI_QUIRK_BROKEN_ADMA;
+			host->quirks2 |= SDHCI_QUIRK2_BROKEN_64_BIT_DMA;
+		}
+	}
+
+	return xenon_phy_parse_params(dev, host);
 }
 
 static int xenon_sdhc_prepare(struct sdhci_host *host)
@@ -476,6 +509,7 @@ static void xenon_sdhc_unprepare(struct sdhci_host *host)
 static int xenon_probe(struct platform_device *pdev)
 {
 	struct sdhci_pltfm_host *pltfm_host;
+	struct device *dev = &pdev->dev;
 	struct sdhci_host *host;
 	struct xenon_priv *priv;
 	int err;
@@ -488,43 +522,46 @@ static int xenon_probe(struct platform_device *pdev)
 	pltfm_host = sdhci_priv(host);
 	priv = sdhci_pltfm_priv(pltfm_host);
 
+	priv->hw_version = (unsigned long)device_get_match_data(&pdev->dev);
+
 	/*
 	 * Link Xenon specific mmc_host_ops function,
 	 * to replace standard ones in sdhci_ops.
 	 */
 	xenon_replace_mmc_host_ops(host);
 
-	pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
-	if (IS_ERR(pltfm_host->clk)) {
-		err = PTR_ERR(pltfm_host->clk);
-		dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
-		goto free_pltfm;
-	}
-	err = clk_prepare_enable(pltfm_host->clk);
-	if (err)
-		goto free_pltfm;
+	if (dev->of_node) {
+		pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
+		if (IS_ERR(pltfm_host->clk))
+			return dev_err_probe(&pdev->dev, PTR_ERR(pltfm_host->clk),
+					     "Failed to setup input clk.\n");
 
-	priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
-	if (IS_ERR(priv->axi_clk)) {
-		err = PTR_ERR(priv->axi_clk);
-		if (err == -EPROBE_DEFER)
-			goto err_clk;
-	} else {
-		err = clk_prepare_enable(priv->axi_clk);
+		err = clk_prepare_enable(pltfm_host->clk);
 		if (err)
-			goto err_clk;
+			return err;
+
+		priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
+		if (IS_ERR(priv->axi_clk)) {
+			err = PTR_ERR(priv->axi_clk);
+			if (err == -EPROBE_DEFER)
+				goto err_clk;
+		} else {
+			err = clk_prepare_enable(priv->axi_clk);
+			if (err)
+				goto err_clk;
+		}
 	}
 
 	err = mmc_of_parse(host->mmc);
 	if (err)
 		goto err_clk_axi;
 
-	sdhci_get_of_property(pdev);
+	sdhci_get_property(pdev);
 
 	xenon_set_acg(host, false);
 
-	/* Xenon specific dt parse */
-	err = xenon_probe_dt(pdev);
+	/* Xenon specific parameters parse */
+	err = xenon_probe_params(pdev);
 	if (err)
 		goto err_clk_axi;
 
@@ -544,6 +581,16 @@ static int xenon_probe(struct platform_device *pdev)
 		goto remove_sdhc;
 
 	pm_runtime_put_autosuspend(&pdev->dev);
+	/*
+	 * If we previously detected AC5 with over 2GB of memory,
+	 * then we disable ADMA and 64-bit DMA.
+	 * This means generic SDHCI driver has set the DMA mask to
+	 * 32-bit. Since DDR starts at 0x2_0000_0000, we must use
+	 * 34-bit DMA mask to access this DDR memory:
+	 */
+	if (priv->hw_version == XENON_AC5 &&
+	    host->quirks2 & SDHCI_QUIRK2_BROKEN_64_BIT_DMA)
+		dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(34));
 
 	return 0;
 
@@ -555,12 +602,10 @@ err_clk_axi:
 	clk_disable_unprepare(priv->axi_clk);
 err_clk:
 	clk_disable_unprepare(pltfm_host->clk);
-free_pltfm:
-	sdhci_pltfm_free(pdev);
 	return err;
 }
 
-static int xenon_remove(struct platform_device *pdev)
+static void xenon_remove(struct platform_device *pdev)
 {
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -575,13 +620,8 @@ static int xenon_remove(struct platform_device *pdev)
 	xenon_sdhc_unprepare(host);
 	clk_disable_unprepare(priv->axi_clk);
 	clk_disable_unprepare(pltfm_host->clk);
-
-	sdhci_pltfm_free(pdev);
-
-	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int xenon_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
@@ -594,19 +634,14 @@ static int xenon_suspend(struct device *dev)
 	priv->restore_needed = true;
 	return ret;
 }
-#endif
 
-#ifdef CONFIG_PM
 static int xenon_runtime_suspend(struct device *dev)
 {
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
-	int ret;
 
-	ret = sdhci_runtime_suspend_host(host);
-	if (ret)
-		return ret;
+	sdhci_runtime_suspend_host(host);
 
 	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
 		mmc_retune_needed(host->mmc);
@@ -641,40 +676,48 @@ static int xenon_runtime_resume(struct device *dev)
 		priv->restore_needed = false;
 	}
 
-	ret = sdhci_runtime_resume_host(host);
-	if (ret)
-		goto out;
+	sdhci_runtime_resume_host(host, 0);
 	return 0;
 out:
 	clk_disable_unprepare(pltfm_host->clk);
 	return ret;
 }
-#endif /* CONFIG_PM */
 
 static const struct dev_pm_ops sdhci_xenon_dev_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(xenon_suspend,
-				pm_runtime_force_resume)
-	SET_RUNTIME_PM_OPS(xenon_runtime_suspend,
-			   xenon_runtime_resume,
-			   NULL)
+	SYSTEM_SLEEP_PM_OPS(xenon_suspend, pm_runtime_force_resume)
+	RUNTIME_PM_OPS(xenon_runtime_suspend, xenon_runtime_resume, NULL)
 };
 
 static const struct of_device_id sdhci_xenon_dt_ids[] = {
-	{ .compatible = "marvell,armada-ap806-sdhci",},
-	{ .compatible = "marvell,armada-cp110-sdhci",},
-	{ .compatible = "marvell,armada-3700-sdhci",},
+	{ .compatible = "marvell,armada-ap806-sdhci", .data = (void *)XENON_AP806},
+	{ .compatible = "marvell,armada-ap807-sdhci", .data = (void *)XENON_AP807},
+	{ .compatible = "marvell,armada-cp110-sdhci", .data =  (void *)XENON_CP110},
+	{ .compatible = "marvell,armada-3700-sdhci", .data =  (void *)XENON_A3700},
+	{ .compatible = "marvell,ac5-sdhci",	     .data =  (void *)XENON_AC5},
 	{}
 };
 MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id sdhci_xenon_acpi_ids[] = {
+	{ .id = "MRVL0002", XENON_AP806},
+	{ .id = "MRVL0003", XENON_AP807},
+	{ .id = "MRVL0004", XENON_CP110},
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, sdhci_xenon_acpi_ids);
+#endif
+
 static struct platform_driver sdhci_xenon_driver = {
 	.driver	= {
 		.name	= "xenon-sdhci",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		.of_match_table = sdhci_xenon_dt_ids,
-		.pm = &sdhci_xenon_dev_pm_ops,
+		.acpi_match_table = ACPI_PTR(sdhci_xenon_acpi_ids),
+		.pm = pm_ptr(&sdhci_xenon_dev_pm_ops),
 	},
 	.probe	= xenon_probe,
-	.remove	= xenon_remove,
+	.remove = xenon_remove,
 };
 
 module_platform_driver(sdhci_xenon_driver);