@@ -101,6 +101,17 @@ config TI_K3_SOCINFO
platforms to provide information about the SoC family and
variant to user space.
+config TI_PRUSS
+ tristate "TI PRU-ICSS Subsystem Platform drivers"
+ depends on SOC_AM33XX
+ select MFD_SYSCON
+ help
+ TI PRU-ICSS Subsystem platform specific support.
+
+ Say Y or M here to support the Programmable Realtime Unit (PRU)
+ processors on various TI SoCs. It's safe to say N here if you're
+ not interested in the PRU or if you are unsure.
+
endif # SOC_TI
config TI_SCI_INTA_MSI_DOMAIN
@@ -12,3 +12,4 @@ obj-$(CONFIG_TI_SCI_PM_DOMAINS) += ti_sci_pm_domains.o
obj-$(CONFIG_TI_SCI_INTA_MSI_DOMAIN) += ti_sci_inta_msi.o
obj-$(CONFIG_TI_K3_RINGACC) += k3-ringacc.o
obj-$(CONFIG_TI_K3_SOCINFO) += k3-socinfo.o
+obj-$(CONFIG_TI_PRUSS) += pruss.o
new file mode 100644
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PRU-ICSS platform driver for various TI SoCs
+ *
+ * Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
+ * Author(s):
+ * Suman Anna <s-anna@ti.com>
+ * Andrew F. Davis <afd@ti.com>
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/pruss_driver.h>
+
+static int pruss_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev_of_node(dev);
+ struct device_node *child;
+ struct pruss *pruss;
+ struct resource res;
+ int ret, i, index;
+ const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
+
+ ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(dev, "failed to set the DMA coherent mask");
+ return ret;
+ }
+
+ pruss = devm_kzalloc(dev, sizeof(*pruss), GFP_KERNEL);
+ if (!pruss)
+ return -ENOMEM;
+
+ pruss->dev = dev;
+
+ child = of_get_child_by_name(np, "memories");
+ if (!child) {
+ dev_err(dev, "%pOF is missing its 'memories' node\n", child);
+ return -ENODEV;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
+ index = of_property_match_string(child, "reg-names",
+ mem_names[i]);
+ if (index < 0) {
+ of_node_put(child);
+ return index;
+ }
+
+ if (of_address_to_resource(child, index, &res)) {
+ of_node_put(child);
+ return -EINVAL;
+ }
+
+ pruss->mem_regions[i].va = devm_ioremap(dev, res.start,
+ resource_size(&res));
+ if (!pruss->mem_regions[i].va) {
+ dev_err(dev, "failed to parse and map memory resource %d %s\n",
+ i, mem_names[i]);
+ of_node_put(child);
+ return -ENOMEM;
+ }
+ pruss->mem_regions[i].pa = res.start;
+ pruss->mem_regions[i].size = resource_size(&res);
+
+ dev_dbg(dev, "memory %8s: pa %pa size 0x%zx va %pK\n",
+ mem_names[i], &pruss->mem_regions[i].pa,
+ pruss->mem_regions[i].size, pruss->mem_regions[i].va);
+ }
+ of_node_put(child);
+
+ platform_set_drvdata(pdev, pruss);
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "couldn't enable module\n");
+ pm_runtime_put_noidle(dev);
+ goto rpm_disable;
+ }
+
+ child = of_get_child_by_name(np, "cfg");
+ if (!child) {
+ dev_err(dev, "%pOF is missing its 'cfg' node\n", child);
+ ret = -ENODEV;
+ goto rpm_put;
+ }
+
+ pruss->cfg_regmap = syscon_node_to_regmap(child);
+ of_node_put(child);
+ if (IS_ERR(pruss->cfg_regmap)) {
+ ret = -ENODEV;
+ goto rpm_put;
+ }
+
+ ret = devm_of_platform_populate(dev);
+ if (ret) {
+ dev_err(dev, "failed to register child devices\n");
+ goto rpm_put;
+ }
+
+ return 0;
+
+rpm_put:
+ pm_runtime_put_sync(dev);
+rpm_disable:
+ pm_runtime_disable(dev);
+ return ret;
+}
+
+static int pruss_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+
+ devm_of_platform_depopulate(dev);
+
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+
+ return 0;
+}
+
+static const struct of_device_id pruss_of_match[] = {
+ { .compatible = "ti,am3356-pruss" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pruss_of_match);
+
+static struct platform_driver pruss_driver = {
+ .driver = {
+ .name = "pruss",
+ .of_match_table = pruss_of_match,
+ },
+ .probe = pruss_probe,
+ .remove = pruss_remove,
+};
+module_platform_driver(pruss_driver);
+
+MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
+MODULE_DESCRIPTION("PRU-ICSS Subsystem Driver");
+MODULE_LICENSE("GPL v2");
new file mode 100644
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * PRU-ICSS sub-system specific definitions
+ *
+ * Copyright (C) 2014-2020 Texas Instruments Incorporated - http://www.ti.com/
+ * Suman Anna <s-anna@ti.com>
+ */
+
+#ifndef _PRUSS_DRIVER_H_
+#define _PRUSS_DRIVER_H_
+
+#include <linux/types.h>
+
+/*
+ * enum pruss_mem - PRUSS memory range identifiers
+ */
+enum pruss_mem {
+ PRUSS_MEM_DRAM0 = 0,
+ PRUSS_MEM_DRAM1,
+ PRUSS_MEM_SHRD_RAM2,
+ PRUSS_MEM_MAX,
+};
+
+/**
+ * struct pruss_mem_region - PRUSS memory region structure
+ * @va: kernel virtual address of the PRUSS memory region
+ * @pa: physical (bus) address of the PRUSS memory region
+ * @size: size of the PRUSS memory region
+ */
+struct pruss_mem_region {
+ void __iomem *va;
+ phys_addr_t pa;
+ size_t size;
+};
+
+/**
+ * struct pruss - PRUSS parent structure
+ * @dev: pruss device pointer
+ * @cfg_regmap: regmap for config region
+ * @mem_regions: data for each of the PRUSS memory regions
+ */
+struct pruss {
+ struct device *dev;
+ struct regmap *cfg_regmap;
+ struct pruss_mem_region mem_regions[PRUSS_MEM_MAX];
+};
+
+#endif /* _PRUSS_DRIVER_H_ */