1 files changed, 217 insertions, 0 deletions
diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
new file mode 100644
index 0000000000..461390925d
--- /dev/null
+++ b/drivers/soc/ti/pruss.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PRU-ICSS platform driver for various TI SoCs
+ *
+ * Copyright (C) 2020-2021 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/of_access.h>
+#include <errno.h>
+#include <clk.h>
+#include <reset.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <power-domain.h>
+#include <linux/pruss_driver.h>
+#include <dm/device_compat.h>
+
+#define PRUSS_CFG_IEPCLK	0x30
+#define ICSSG_CFG_CORE_SYNC	0x3c
+
+#define ICSSG_TASK_MGR_OFFSET	0x2a000
+
+/* PRUSS_IEPCLK register bits */
+#define PRUSS_IEPCLK_IEP_OCP_CLK_EN		BIT(0)
+
+/* ICSSG CORE_SYNC register bits */
+#define ICSSG_CORE_VBUSP_SYNC_EN		BIT(0)
+
+/*
+ * pruss_request_tm_region() - Request pruss for task manager region
+ * @dev:	corresponding k3 device
+ * @loc:	the task manager physical address
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+int pruss_request_tm_region(struct udevice *dev, phys_addr_t *loc)
+{
+	struct pruss *priv;
+
+	priv = dev_get_priv(dev);
+	if (!priv || !priv->mem_regions[PRUSS_MEM_DRAM0].pa)
+		return -EINVAL;
+
+	*loc = priv->mem_regions[PRUSS_MEM_DRAM0].pa + ICSSG_TASK_MGR_OFFSET;
+
+	return 0;
+}
+
+/**
+ * pruss_request_mem_region() - request a memory resource
+ * @dev: the pruss device
+ * @mem_id: the memory resource id
+ * @region: pointer to memory region structure to be filled in
+ *
+ * This function allows a client driver to request a memory resource,
+ * and if successful, will let the client driver own the particular
+ * memory region until released using the pruss_release_mem_region()
+ * API.
+ *
+ * Returns the memory region if requested resource is available, an
+ * error otherwise
+ */
+int pruss_request_mem_region(struct udevice *dev, enum pruss_mem mem_id,
+			     struct pruss_mem_region *region)
+{
+	struct pruss *pruss;
+
+	pruss = dev_get_priv(dev);
+	if (!pruss || !region)
+		return -EINVAL;
+
+	if (mem_id >= PRUSS_MEM_MAX)
+		return -EINVAL;
+
+	if (pruss->mem_in_use[mem_id])
+		return -EBUSY;
+
+	*region = pruss->mem_regions[mem_id];
+	pruss->mem_in_use[mem_id] = region;
+
+	return 0;
+}
+
+/**
+ * pruss_release_mem_region() - release a memory resource
+ * @dev: the pruss device
+ * @region: the memory region to release
+ *
+ * This function is the complimentary function to
+ * pruss_request_mem_region(), and allows the client drivers to
+ * release back a memory resource.
+ *
+ * Returns 0 on success, an error code otherwise
+ */
+int pruss_release_mem_region(struct udevice *dev,
+			     struct pruss_mem_region *region)
+{
+	struct pruss *pruss;
+	int id;
+
+	pruss = dev_get_priv(dev);
+	if (!pruss || !region)
+		return -EINVAL;
+
+	/* find out the memory region being released */
+	for (id = 0; id < PRUSS_MEM_MAX; id++) {
+		if (pruss->mem_in_use[id] == region)
+			break;
+	}
+
+	if (id == PRUSS_MEM_MAX)
+		return -EINVAL;
+
+	pruss->mem_in_use[id] = NULL;
+
+	return 0;
+}
+
+/**
+ * pruss_cfg_update() - configure a PRUSS CFG sub-module register
+ * @dev: the pruss device
+ * @reg: register offset within the CFG sub-module
+ * @mask: bit mask to use for programming the @val
+ * @val: value to write
+ *
+ * Programs a given register within the PRUSS CFG sub-module
+ *
+ * Returns 0 on success, or an error code otherwise
+ */
+int pruss_cfg_update(struct udevice *dev, unsigned int reg,
+		     unsigned int mask, unsigned int val)
+{
+	struct pruss *pruss;
+
+	pruss = dev_get_priv(dev);
+	if (IS_ERR_OR_NULL(pruss))
+		return -EINVAL;
+
+	return regmap_update_bits(pruss->cfg, reg, mask, val);
+}
+
+/**
+ * pruss_probe() - Basic probe
+ * @dev:	corresponding k3 device
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+static int pruss_probe(struct udevice *dev)
+{
+	const char *mem_names[PRUSS_MEM_MAX] = { "dram0", "dram1", "shrdram2" };
+	ofnode sub_node, node, memories;
+	struct udevice *syscon;
+	struct pruss *priv;
+	int ret, idx, i;
+
+	priv = dev_get_priv(dev);
+	node = dev_ofnode(dev);
+	priv->dev = dev;
+	memories = ofnode_find_subnode(node, "memories");
+
+	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
+		idx = ofnode_stringlist_search(memories, "reg-names", mem_names[i]);
+		priv->mem_regions[i].pa = ofnode_get_addr_size_index(memories, idx,
+						       (u64 *)&priv->mem_regions[i].size);
+	}
+
+	sub_node = ofnode_find_subnode(node, "cfg");
+	ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, sub_node,
+					  &syscon);
+
+	priv->cfg = syscon_get_regmap(syscon);
+	if (IS_ERR(priv->cfg)) {
+		dev_err(dev, "unable to get cfg regmap (%ld)\n",
+			PTR_ERR(priv->cfg));
+		return -ENODEV;
+	}
+
+	/*
+	 * ToDo: To be modelled as clocks.
+	 * The CORE block uses two multiplexers to allow software to
+	 * select one of three source clocks (ICSSGn_CORE_CLK, ICSSGn_ICLK or
+	 * ICSSGn_IEP_CLK) for the final clock source of the CORE block.
+	 * The user needs to configure ICSSG_CORE_SYNC_REG[0] CORE_VBUSP_SYNC_EN
+	 * bit & ICSSG_IEPCLK_REG[0] IEP_OCP_CLK_EN bit in order to select the
+	 * clock source to the CORE block.
+	 */
+	ret = regmap_update_bits(priv->cfg, ICSSG_CFG_CORE_SYNC,
+				 ICSSG_CORE_VBUSP_SYNC_EN,
+				 ICSSG_CORE_VBUSP_SYNC_EN);
+	if (ret)
+		return ret;
+	ret = regmap_update_bits(priv->cfg, PRUSS_CFG_IEPCLK,
+				 PRUSS_IEPCLK_IEP_OCP_CLK_EN,
+				 PRUSS_IEPCLK_IEP_OCP_CLK_EN);
+	if (ret)
+		return ret;
+
+	dev_dbg(dev, "pruss successfully probed %s\n", dev->name);
+
+	return 0;
+}
+
+static const struct udevice_id pruss_ids[] = {
+	{ .compatible = "ti,am654-icssg"},
+	{}
+};
+
+U_BOOT_DRIVER(pruss) = {
+	.name = "pruss",
+	.of_match = pruss_ids,
+	.id = UCLASS_MISC,
+	.probe = pruss_probe,
+	.priv_auto = sizeof(struct pruss),
+};