1 files changed, 445 insertions, 0 deletions

diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c
new file mode 100644
index 000000000..f9640e37b
--- /dev/null
+++ b/drivers/dma/qcom/hidma_mgmt.c
@@ -0,0 +1,445 @@
+/*
+ * Qualcomm Technologies HIDMA DMA engine Management interface
+ *
+ * Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/dmaengine.h>
+#include <linux/acpi.h>
+#include <linux/of.h>
+#include <linux/property.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/module.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/bitops.h>
+#include <linux/dma-mapping.h>
+
+#include "hidma_mgmt.h"
+
+#define HIDMA_QOS_N_OFFSET		0x700
+#define HIDMA_CFG_OFFSET		0x400
+#define HIDMA_MAX_BUS_REQ_LEN_OFFSET	0x41C
+#define HIDMA_MAX_XACTIONS_OFFSET	0x420
+#define HIDMA_HW_VERSION_OFFSET	0x424
+#define HIDMA_CHRESET_TIMEOUT_OFFSET	0x418
+
+#define HIDMA_MAX_WR_XACTIONS_MASK	GENMASK(4, 0)
+#define HIDMA_MAX_RD_XACTIONS_MASK	GENMASK(4, 0)
+#define HIDMA_WEIGHT_MASK		GENMASK(6, 0)
+#define HIDMA_MAX_BUS_REQ_LEN_MASK	GENMASK(15, 0)
+#define HIDMA_CHRESET_TIMEOUT_MASK	GENMASK(19, 0)
+
+#define HIDMA_MAX_WR_XACTIONS_BIT_POS	16
+#define HIDMA_MAX_BUS_WR_REQ_BIT_POS	16
+#define HIDMA_WRR_BIT_POS		8
+#define HIDMA_PRIORITY_BIT_POS		15
+
+#define HIDMA_AUTOSUSPEND_TIMEOUT	2000
+#define HIDMA_MAX_CHANNEL_WEIGHT	15
+
+static unsigned int max_write_request;
+module_param(max_write_request, uint, 0644);
+MODULE_PARM_DESC(max_write_request,
+		"maximum write burst (default: ACPI/DT value)");
+
+static unsigned int max_read_request;
+module_param(max_read_request, uint, 0644);
+MODULE_PARM_DESC(max_read_request,
+		"maximum read burst (default: ACPI/DT value)");
+
+static unsigned int max_wr_xactions;
+module_param(max_wr_xactions, uint, 0644);
+MODULE_PARM_DESC(max_wr_xactions,
+	"maximum number of write transactions (default: ACPI/DT value)");
+
+static unsigned int max_rd_xactions;
+module_param(max_rd_xactions, uint, 0644);
+MODULE_PARM_DESC(max_rd_xactions,
+	"maximum number of read transactions (default: ACPI/DT value)");
+
+int hidma_mgmt_setup(struct hidma_mgmt_dev *mgmtdev)
+{
+	unsigned int i;
+	u32 val;
+
+	if (!is_power_of_2(mgmtdev->max_write_request) ||
+	    (mgmtdev->max_write_request < 128) ||
+	    (mgmtdev->max_write_request > 1024)) {
+		dev_err(&mgmtdev->pdev->dev, "invalid write request %d\n",
+			mgmtdev->max_write_request);
+		return -EINVAL;
+	}
+
+	if (!is_power_of_2(mgmtdev->max_read_request) ||
+	    (mgmtdev->max_read_request < 128) ||
+	    (mgmtdev->max_read_request > 1024)) {
+		dev_err(&mgmtdev->pdev->dev, "invalid read request %d\n",
+			mgmtdev->max_read_request);
+		return -EINVAL;
+	}
+
+	if (mgmtdev->max_wr_xactions > HIDMA_MAX_WR_XACTIONS_MASK) {
+		dev_err(&mgmtdev->pdev->dev,
+			"max_wr_xactions cannot be bigger than %ld\n",
+			HIDMA_MAX_WR_XACTIONS_MASK);
+		return -EINVAL;
+	}
+
+	if (mgmtdev->max_rd_xactions > HIDMA_MAX_RD_XACTIONS_MASK) {
+		dev_err(&mgmtdev->pdev->dev,
+			"max_rd_xactions cannot be bigger than %ld\n",
+			HIDMA_MAX_RD_XACTIONS_MASK);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < mgmtdev->dma_channels; i++) {
+		if (mgmtdev->priority[i] > 1) {
+			dev_err(&mgmtdev->pdev->dev,
+				"priority can be 0 or 1\n");
+			return -EINVAL;
+		}
+
+		if (mgmtdev->weight[i] > HIDMA_MAX_CHANNEL_WEIGHT) {
+			dev_err(&mgmtdev->pdev->dev,
+				"max value of weight can be %d.\n",
+				HIDMA_MAX_CHANNEL_WEIGHT);
+			return -EINVAL;
+		}
+
+		/* weight needs to be at least one */
+		if (mgmtdev->weight[i] == 0)
+			mgmtdev->weight[i] = 1;
+	}
+
+	pm_runtime_get_sync(&mgmtdev->pdev->dev);
+	val = readl(mgmtdev->virtaddr + HIDMA_MAX_BUS_REQ_LEN_OFFSET);
+	val &= ~(HIDMA_MAX_BUS_REQ_LEN_MASK << HIDMA_MAX_BUS_WR_REQ_BIT_POS);
+	val |= mgmtdev->max_write_request << HIDMA_MAX_BUS_WR_REQ_BIT_POS;
+	val &= ~HIDMA_MAX_BUS_REQ_LEN_MASK;
+	val |= mgmtdev->max_read_request;
+	writel(val, mgmtdev->virtaddr + HIDMA_MAX_BUS_REQ_LEN_OFFSET);
+
+	val = readl(mgmtdev->virtaddr + HIDMA_MAX_XACTIONS_OFFSET);
+	val &= ~(HIDMA_MAX_WR_XACTIONS_MASK << HIDMA_MAX_WR_XACTIONS_BIT_POS);
+	val |= mgmtdev->max_wr_xactions << HIDMA_MAX_WR_XACTIONS_BIT_POS;
+	val &= ~HIDMA_MAX_RD_XACTIONS_MASK;
+	val |= mgmtdev->max_rd_xactions;
+	writel(val, mgmtdev->virtaddr + HIDMA_MAX_XACTIONS_OFFSET);
+
+	mgmtdev->hw_version =
+	    readl(mgmtdev->virtaddr + HIDMA_HW_VERSION_OFFSET);
+	mgmtdev->hw_version_major = (mgmtdev->hw_version >> 28) & 0xF;
+	mgmtdev->hw_version_minor = (mgmtdev->hw_version >> 16) & 0xF;
+
+	for (i = 0; i < mgmtdev->dma_channels; i++) {
+		u32 weight = mgmtdev->weight[i];
+		u32 priority = mgmtdev->priority[i];
+
+		val = readl(mgmtdev->virtaddr + HIDMA_QOS_N_OFFSET + (4 * i));
+		val &= ~(1 << HIDMA_PRIORITY_BIT_POS);
+		val |= (priority & 0x1) << HIDMA_PRIORITY_BIT_POS;
+		val &= ~(HIDMA_WEIGHT_MASK << HIDMA_WRR_BIT_POS);
+		val |= (weight & HIDMA_WEIGHT_MASK) << HIDMA_WRR_BIT_POS;
+		writel(val, mgmtdev->virtaddr + HIDMA_QOS_N_OFFSET + (4 * i));
+	}
+
+	val = readl(mgmtdev->virtaddr + HIDMA_CHRESET_TIMEOUT_OFFSET);
+	val &= ~HIDMA_CHRESET_TIMEOUT_MASK;
+	val |= mgmtdev->chreset_timeout_cycles & HIDMA_CHRESET_TIMEOUT_MASK;
+	writel(val, mgmtdev->virtaddr + HIDMA_CHRESET_TIMEOUT_OFFSET);
+
+	pm_runtime_mark_last_busy(&mgmtdev->pdev->dev);
+	pm_runtime_put_autosuspend(&mgmtdev->pdev->dev);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hidma_mgmt_setup);
+
+static int hidma_mgmt_probe(struct platform_device *pdev)
+{
+	struct hidma_mgmt_dev *mgmtdev;
+	struct resource *res;
+	void __iomem *virtaddr;
+	int irq;
+	int rc;
+	u32 val;
+
+	pm_runtime_set_autosuspend_delay(&pdev->dev, HIDMA_AUTOSUSPEND_TIMEOUT);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	virtaddr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(virtaddr)) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "irq resources not found\n");
+		rc = irq;
+		goto out;
+	}
+
+	mgmtdev = devm_kzalloc(&pdev->dev, sizeof(*mgmtdev), GFP_KERNEL);
+	if (!mgmtdev) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	mgmtdev->pdev = pdev;
+	mgmtdev->addrsize = resource_size(res);
+	mgmtdev->virtaddr = virtaddr;
+
+	rc = device_property_read_u32(&pdev->dev, "dma-channels",
+				      &mgmtdev->dma_channels);
+	if (rc) {
+		dev_err(&pdev->dev, "number of channels missing\n");
+		goto out;
+	}
+
+	rc = device_property_read_u32(&pdev->dev,
+				      "channel-reset-timeout-cycles",
+				      &mgmtdev->chreset_timeout_cycles);
+	if (rc) {
+		dev_err(&pdev->dev, "channel reset timeout missing\n");
+		goto out;
+	}
+
+	rc = device_property_read_u32(&pdev->dev, "max-write-burst-bytes",
+				      &mgmtdev->max_write_request);
+	if (rc) {
+		dev_err(&pdev->dev, "max-write-burst-bytes missing\n");
+		goto out;
+	}
+
+	if (max_write_request &&
+			(max_write_request != mgmtdev->max_write_request)) {
+		dev_info(&pdev->dev, "overriding max-write-burst-bytes: %d\n",
+			max_write_request);
+		mgmtdev->max_write_request = max_write_request;
+	} else
+		max_write_request = mgmtdev->max_write_request;
+
+	rc = device_property_read_u32(&pdev->dev, "max-read-burst-bytes",
+				      &mgmtdev->max_read_request);
+	if (rc) {
+		dev_err(&pdev->dev, "max-read-burst-bytes missing\n");
+		goto out;
+	}
+	if (max_read_request &&
+			(max_read_request != mgmtdev->max_read_request)) {
+		dev_info(&pdev->dev, "overriding max-read-burst-bytes: %d\n",
+			max_read_request);
+		mgmtdev->max_read_request = max_read_request;
+	} else
+		max_read_request = mgmtdev->max_read_request;
+
+	rc = device_property_read_u32(&pdev->dev, "max-write-transactions",
+				      &mgmtdev->max_wr_xactions);
+	if (rc) {
+		dev_err(&pdev->dev, "max-write-transactions missing\n");
+		goto out;
+	}
+	if (max_wr_xactions &&
+			(max_wr_xactions != mgmtdev->max_wr_xactions)) {
+		dev_info(&pdev->dev, "overriding max-write-transactions: %d\n",
+			max_wr_xactions);
+		mgmtdev->max_wr_xactions = max_wr_xactions;
+	} else
+		max_wr_xactions = mgmtdev->max_wr_xactions;
+
+	rc = device_property_read_u32(&pdev->dev, "max-read-transactions",
+				      &mgmtdev->max_rd_xactions);
+	if (rc) {
+		dev_err(&pdev->dev, "max-read-transactions missing\n");
+		goto out;
+	}
+	if (max_rd_xactions &&
+			(max_rd_xactions != mgmtdev->max_rd_xactions)) {
+		dev_info(&pdev->dev, "overriding max-read-transactions: %d\n",
+			max_rd_xactions);
+		mgmtdev->max_rd_xactions = max_rd_xactions;
+	} else
+		max_rd_xactions = mgmtdev->max_rd_xactions;
+
+	mgmtdev->priority = devm_kcalloc(&pdev->dev,
+					 mgmtdev->dma_channels,
+					 sizeof(*mgmtdev->priority),
+					 GFP_KERNEL);
+	if (!mgmtdev->priority) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	mgmtdev->weight = devm_kcalloc(&pdev->dev,
+				       mgmtdev->dma_channels,
+				       sizeof(*mgmtdev->weight), GFP_KERNEL);
+	if (!mgmtdev->weight) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	rc = hidma_mgmt_setup(mgmtdev);
+	if (rc) {
+		dev_err(&pdev->dev, "setup failed\n");
+		goto out;
+	}
+
+	/* start the HW */
+	val = readl(mgmtdev->virtaddr + HIDMA_CFG_OFFSET);
+	val |= 1;
+	writel(val, mgmtdev->virtaddr + HIDMA_CFG_OFFSET);
+
+	rc = hidma_mgmt_init_sys(mgmtdev);
+	if (rc) {
+		dev_err(&pdev->dev, "sysfs setup failed\n");
+		goto out;
+	}
+
+	dev_info(&pdev->dev,
+		 "HW rev: %d.%d @ %pa with %d physical channels\n",
+		 mgmtdev->hw_version_major, mgmtdev->hw_version_minor,
+		 &res->start, mgmtdev->dma_channels);
+
+	platform_set_drvdata(pdev, mgmtdev);
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+	return 0;
+out:
+	pm_runtime_put_sync_suspend(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	return rc;
+}
+
+#if IS_ENABLED(CONFIG_ACPI)
+static const struct acpi_device_id hidma_mgmt_acpi_ids[] = {
+	{"QCOM8060"},
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, hidma_mgmt_acpi_ids);
+#endif
+
+static const struct of_device_id hidma_mgmt_match[] = {
+	{.compatible = "qcom,hidma-mgmt-1.0",},
+	{},
+};
+MODULE_DEVICE_TABLE(of, hidma_mgmt_match);
+
+static struct platform_driver hidma_mgmt_driver = {
+	.probe = hidma_mgmt_probe,
+	.driver = {
+		   .name = "hidma-mgmt",
+		   .of_match_table = hidma_mgmt_match,
+		   .acpi_match_table = ACPI_PTR(hidma_mgmt_acpi_ids),
+	},
+};
+
+#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
+static int object_counter;
+
+static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
+{
+	struct platform_device *pdev_parent = of_find_device_by_node(np);
+	struct platform_device_info pdevinfo;
+	struct device_node *child;
+	struct resource *res;
+	int ret = 0;
+
+	/* allocate a resource array */
+	res = kcalloc(3, sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return -ENOMEM;
+
+	for_each_available_child_of_node(np, child) {
+		struct platform_device *new_pdev;
+
+		ret = of_address_to_resource(child, 0, &res[0]);
+		if (!ret)
+			goto out;
+
+		ret = of_address_to_resource(child, 1, &res[1]);
+		if (!ret)
+			goto out;
+
+		ret = of_irq_to_resource(child, 0, &res[2]);
+		if (ret <= 0)
+			goto out;
+
+		memset(&pdevinfo, 0, sizeof(pdevinfo));
+		pdevinfo.fwnode = &child->fwnode;
+		pdevinfo.parent = pdev_parent ? &pdev_parent->dev : NULL;
+		pdevinfo.name = child->name;
+		pdevinfo.id = object_counter++;
+		pdevinfo.res = res;
+		pdevinfo.num_res = 3;
+		pdevinfo.data = NULL;
+		pdevinfo.size_data = 0;
+		pdevinfo.dma_mask = DMA_BIT_MASK(64);
+		new_pdev = platform_device_register_full(&pdevinfo);
+		if (IS_ERR(new_pdev)) {
+			ret = PTR_ERR(new_pdev);
+			goto out;
+		}
+		of_node_get(child);
+		new_pdev->dev.of_node = child;
+		of_dma_configure(&new_pdev->dev, child, true);
+		/*
+		 * It is assumed that calling of_msi_configure is safe on
+		 * platforms with or without MSI support.
+		 */
+		of_msi_configure(&new_pdev->dev, child);
+		of_node_put(child);
+	}
+out:
+	kfree(res);
+
+	return ret;
+}
+#endif
+
+static int __init hidma_mgmt_init(void)
+{
+#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
+	struct device_node *child;
+
+	for_each_matching_node(child, hidma_mgmt_match) {
+		/* device tree based firmware here */
+		hidma_mgmt_of_populate_channels(child);
+	}
+#endif
+	/*
+	 * We do not check for return value here, as it is assumed that
+	 * platform_driver_register must not fail. The reason for this is that
+	 * the (potential) hidma_mgmt_of_populate_channels calls above are not
+	 * cleaned up if it does fail, and to do this work is quite
+	 * complicated. In particular, various calls of of_address_to_resource,
+	 * of_irq_to_resource, platform_device_register_full, of_dma_configure,
+	 * and of_msi_configure which then call other functions and so on, must
+	 * be cleaned up - this is not a trivial exercise.
+	 *
+	 * Currently, this module is not intended to be unloaded, and there is
+	 * no module_exit function defined which does the needed cleanup. For
+	 * this reason, we have to assume success here.
+	 */
+	platform_driver_register(&hidma_mgmt_driver);
+
+	return 0;
+}
+module_init(hidma_mgmt_init);
+MODULE_LICENSE("GPL v2");