3 files changed, 271 insertions, 0 deletions

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 5e343bab9458..28c711f0ac6b 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -41,6 +41,19 @@ config STE_MODEM_RPROC
           This can be either built-in or a loadable module.
           If unsure say N.
 
+config WKUP_M3_RPROC
+        tristate "AMx3xx Wakeup M3 remoteproc support"
+        depends on SOC_AM33XX || SOC_AM43XX
+        select REMOTEPROC
+        help
+          Say y here to support Wakeup M3 remote processor on TI AM33xx
+          and AM43xx family of SoCs.
+
+          Required for Suspend-to-RAM on AM33xx and AM43xx SoCs. Also needed
+          for deep CPUIdle states on AM33xx SoCs. Allows for loading of the
+          firmware onto these remote processors.
+          If unsure say N.
+
 config DA8XX_REMOTEPROC
         tristate "DA8xx/OMAP-L13x remoteproc support"
         depends on ARCH_DAVINCI_DA8XX
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index ac2ff75686d2..81b04d1e2e58 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -9,4 +9,5 @@ remoteproc-y				+= remoteproc_virtio.o
 remoteproc-y                            += remoteproc_elf_loader.o
 obj-$(CONFIG_OMAP_REMOTEPROC)           += omap_remoteproc.o
 obj-$(CONFIG_STE_MODEM_RPROC)           += ste_modem_rproc.o
+obj-$(CONFIG_WKUP_M3_RPROC)             += wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)          += da8xx_remoteproc.o
diff --git a/drivers/remoteproc/wkup_m3_rproc.c b/drivers/remoteproc/wkup_m3_rproc.c
new file mode 100644
index 000000000000..edf81819cce1
--- /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>");