Linux-libre 4.2-gnu

1 files changed, 257 insertions, 0 deletions

diff --git a/drivers/remoteproc/wkup_m3_rproc.c b/drivers/remoteproc/wkup_m3_rproc.c
new file mode 100644
index 000000000..edf81819c
--- /dev/null
+++ b/drivers/remoteproc/wkup_m3_rproc.c
@@ -0,0 +1,257 @@
+/*
+ * TI AMx3 Wakeup M3 Remote Processor driver
+ *
+ * Copyright (C) 2014-2015 Texas Instruments, Inc.
+ *
+ * Dave Gerlach <d-gerlach@ti.com>
+ * Suman Anna <s-anna@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * 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/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/remoteproc.h>
+
+#include <linux/platform_data/wkup_m3.h>
+
+#include "remoteproc_internal.h"
+
+#define WKUPM3_MEM_MAX	2
+
+/**
+ * struct wkup_m3_mem - WkupM3 internal memory structure
+ * @cpu_addr: MPU virtual address of the memory region
+ * @bus_addr: Bus address used to access the memory region
+ * @dev_addr: Device address from Wakeup M3 view
+ * @size: Size of the memory region
+ */
+struct wkup_m3_mem {
+	void __iomem *cpu_addr;
+	phys_addr_t bus_addr;
+	u32 dev_addr;
+	size_t size;
+};
+
+/**
+ * struct wkup_m3_rproc - WkupM3 remote processor state
+ * @rproc: rproc handle
+ * @pdev: pointer to platform device
+ * @mem: WkupM3 memory information
+ */
+struct wkup_m3_rproc {
+	struct rproc *rproc;
+	struct platform_device *pdev;
+	struct wkup_m3_mem mem[WKUPM3_MEM_MAX];
+};
+
+static int wkup_m3_rproc_start(struct rproc *rproc)
+{
+	struct wkup_m3_rproc *wkupm3 = rproc->priv;
+	struct platform_device *pdev = wkupm3->pdev;
+	struct device *dev = &pdev->dev;
+	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
+
+	if (pdata->deassert_reset(pdev, pdata->reset_name)) {
+		dev_err(dev, "Unable to reset wkup_m3!\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int wkup_m3_rproc_stop(struct rproc *rproc)
+{
+	struct wkup_m3_rproc *wkupm3 = rproc->priv;
+	struct platform_device *pdev = wkupm3->pdev;
+	struct device *dev = &pdev->dev;
+	struct wkup_m3_platform_data *pdata = dev_get_platdata(dev);
+
+	if (pdata->assert_reset(pdev, pdata->reset_name)) {
+		dev_err(dev, "Unable to assert reset of wkup_m3!\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+	struct wkup_m3_rproc *wkupm3 = rproc->priv;
+	void *va = NULL;
+	int i;
+	u32 offset;
+
+	if (len <= 0)
+		return NULL;
+
+	for (i = 0; i < WKUPM3_MEM_MAX; i++) {
+		if (da >= wkupm3->mem[i].dev_addr && da + len <=
+		    wkupm3->mem[i].dev_addr +  wkupm3->mem[i].size) {
+			offset = da -  wkupm3->mem[i].dev_addr;
+			/* __force to make sparse happy with type conversion */
+			va = (__force void *)(wkupm3->mem[i].cpu_addr + offset);
+			break;
+		}
+	}
+
+	return va;
+}
+
+static struct rproc_ops wkup_m3_rproc_ops = {
+	.start		= wkup_m3_rproc_start,
+	.stop		= wkup_m3_rproc_stop,
+	.da_to_va	= wkup_m3_rproc_da_to_va,
+};
+
+static const struct of_device_id wkup_m3_rproc_of_match[] = {
+	{ .compatible = "ti,am3352-wkup-m3", },
+	{ .compatible = "ti,am4372-wkup-m3", },
+	{},
+};
+
+static int wkup_m3_rproc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct wkup_m3_platform_data *pdata = dev->platform_data;
+	/* umem always needs to be processed first */
+	const char *mem_names[WKUPM3_MEM_MAX] = { "umem", "dmem" };
+	struct wkup_m3_rproc *wkupm3;
+	const char *fw_name;
+	struct rproc *rproc;
+	struct resource *res;
+	const __be32 *addrp;
+	u32 l4_offset = 0;
+	u64 size;
+	int ret;
+	int i;
+
+	if (!(pdata && pdata->deassert_reset && pdata->assert_reset &&
+	      pdata->reset_name)) {
+		dev_err(dev, "Platform data missing!\n");
+		return -ENODEV;
+	}
+
+	ret = of_property_read_string(dev->of_node, "ti,pm-firmware",
+				      &fw_name);
+	if (ret) {
+		dev_err(dev, "No firmware filename given\n");
+		return -ENODEV;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
+		goto err;
+	}
+
+	rproc = rproc_alloc(dev, "wkup_m3", &wkup_m3_rproc_ops,
+			    fw_name, sizeof(*wkupm3));
+	if (!rproc) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	wkupm3 = rproc->priv;
+	wkupm3->rproc = rproc;
+	wkupm3->pdev = pdev;
+
+	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+						   mem_names[i]);
+		wkupm3->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
+		if (IS_ERR(wkupm3->mem[i].cpu_addr)) {
+			dev_err(&pdev->dev, "devm_ioremap_resource failed for resource %d\n",
+				i);
+			ret = PTR_ERR(wkupm3->mem[i].cpu_addr);
+			goto err;
+		}
+		wkupm3->mem[i].bus_addr = res->start;
+		wkupm3->mem[i].size = resource_size(res);
+		addrp = of_get_address(dev->of_node, i, &size, NULL);
+		/*
+		 * The wkupm3 has umem at address 0 in its view, so the device
+		 * addresses for each memory region is computed as a relative
+		 * offset of the bus address for umem, and therefore needs to be
+		 * processed first.
+		 */
+		if (!strcmp(mem_names[i], "umem"))
+			l4_offset = be32_to_cpu(*addrp);
+		wkupm3->mem[i].dev_addr = be32_to_cpu(*addrp) - l4_offset;
+	}
+
+	dev_set_drvdata(dev, rproc);
+
+	ret = rproc_add(rproc);
+	if (ret) {
+		dev_err(dev, "rproc_add failed\n");
+		goto err_put_rproc;
+	}
+
+	return 0;
+
+err_put_rproc:
+	rproc_put(rproc);
+err:
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
+	return ret;
+}
+
+static int wkup_m3_rproc_remove(struct platform_device *pdev)
+{
+	struct rproc *rproc = platform_get_drvdata(pdev);
+
+	rproc_del(rproc);
+	rproc_put(rproc);
+	pm_runtime_put_sync(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int wkup_m3_rpm_suspend(struct device *dev)
+{
+	return -EBUSY;
+}
+
+static int wkup_m3_rpm_resume(struct device *dev)
+{
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops wkup_m3_rproc_pm_ops = {
+	SET_RUNTIME_PM_OPS(wkup_m3_rpm_suspend, wkup_m3_rpm_resume, NULL)
+};
+
+static struct platform_driver wkup_m3_rproc_driver = {
+	.probe = wkup_m3_rproc_probe,
+	.remove = wkup_m3_rproc_remove,
+	.driver = {
+		.name = "wkup_m3_rproc",
+		.of_match_table = wkup_m3_rproc_of_match,
+		.pm = &wkup_m3_rproc_pm_ops,
+	},
+};
+
+module_platform_driver(wkup_m3_rproc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TI Wakeup M3 remote processor control driver");
+MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");