[PATCH v2 02/10] soc: ti: pruss: add a misc driver for PRUSS in TI SoCs
Keerthy
j-keerthy at ti.com
Tue Feb 18 06:09:56 CET 2020
The Programmable Real-Time Unit - Industrial Communication
Subsystem (PRU-ICSS) is present of various TI SoCs such as
AM335x or AM437x or the AM654x family. Each SoC can have
one or more PRUSS instances that may or may not be identical.
The PRUSS consists of dual 32-bit RISC cores called the
Programmable Real-Time Units (PRUs), some shared, data and
instruction memories, some internal peripheral modules, and
an interrupt controller. The programmable nature of the PRUs
provide flexibility to implement custom peripheral interfaces,
fast real-time responses, or specialized data handling.
Add support for pruss driver. Currently am654x family
is supported.
Signed-off-by: Keerthy <j-keerthy at ti.com>
---
Changes in v2:
* Fixed multiple comments from Andreas w.r.t header file define guards
and Kconfig help typos.
drivers/soc/ti/Kconfig | 12 ++++
drivers/soc/ti/Makefile | 1 +
drivers/soc/ti/pruss.c | 152 ++++++++++++++++++++++++++++++++++++++++
include/ti-pruss.h | 17 +++++
4 files changed, 182 insertions(+)
create mode 100644 drivers/soc/ti/pruss.c
create mode 100644 include/ti-pruss.h
diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig
index e4f8834448..19bce14c05 100644
--- a/drivers/soc/ti/Kconfig
+++ b/drivers/soc/ti/Kconfig
@@ -23,4 +23,16 @@ config TI_KEYSTONE_SERDES
SerDes driver for Keystone SoC used for ethernet support on TI
K2 platforms.
+config TI_PRUSS
+ bool "Support for TI's K3 based Pruss driver"
+ depends on DM
+ depends on ARCH_K3
+ depends on OF_CONTROL
+ depends on SYSCON
+ help
+ Support for TI PRU-ICSSG subsystem.
+
+ Currently supported on AM65xx SoCs. Say Y here to support the
+ Programmable Realtime Unit (PRU).
+
endif # SOC_TI
diff --git a/drivers/soc/ti/Makefile b/drivers/soc/ti/Makefile
index 4ec04ee125..34f80aad29 100644
--- a/drivers/soc/ti/Makefile
+++ b/drivers/soc/ti/Makefile
@@ -2,3 +2,4 @@
obj-$(CONFIG_TI_K3_NAVSS_RINGACC) += k3-navss-ringacc.o
obj-$(CONFIG_TI_KEYSTONE_SERDES) += keystone_serdes.o
+obj-$(CONFIG_TI_PRUSS) += pruss.o
diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
new file mode 100644
index 0000000000..059ae11805
--- /dev/null
+++ b/drivers/soc/ti/pruss.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PRU-ICSS platform driver for various TI SoCs
+ *
+ * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
+ * Keerthy <j-keerthy at ti.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/device_compat.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 <ti-pruss.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)
+
+/**
+ * enum pruss_mem - PRUSS memory range identifiers
+ */
+enum pruss_mem {
+ PRUSS_MEM_DRAM0 = 0,
+ PRUSS_MEM_DRAM1,
+ PRUSS_MEM_SHRD_RAM2,
+ PRUSS_MEM_MAX,
+};
+
+/*
+ * 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->pruss_dram0)
+ return -EINVAL;
+
+ *loc = priv->pruss_dram0 + ICSSG_TASK_MGR_OFFSET;
+
+ return 0;
+}
+
+/*
+ * pruss_request_shrmem_region() - Request pruss for shared memory region
+ * @dev: corresponding k3 device
+ * @loc: the shared memory physical address
+ *
+ * Return: 0 if all goes good, else appropriate error message.
+ */
+int pruss_request_shrmem_region(struct udevice *dev, phys_addr_t *loc)
+{
+ struct pruss *priv;
+
+ priv = dev_get_priv(dev);
+ if (!priv || !priv->pruss_shrdram2)
+ return -EINVAL;
+
+ *loc = priv->pruss_shrdram2;
+
+ return 0;
+}
+
+/**
+ * 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)
+{
+ struct pruss *priv;
+ int ret, idx;
+ ofnode sub_node, node, memories;
+ struct regmap *regmap_cfg;
+ struct udevice *syscon;
+
+ priv = dev_get_priv(dev);
+ node = dev_ofnode(dev);
+ sub_node = ofnode_find_subnode(node, "cfg");
+ memories = ofnode_find_subnode(node, "memories");
+
+ idx = ofnode_stringlist_search(memories, "reg-names", "dram0");
+ priv->pruss_dram0 = ofnode_get_addr_size_index(memories, idx,
+ (u64 *)&priv->pruss_dram0sz);
+ idx = ofnode_stringlist_search(memories, "reg-names", "dram1");
+ priv->pruss_dram1 = ofnode_get_addr_size_index(memories, idx,
+ (u64 *)&priv->pruss_dram1sz);
+ idx = ofnode_stringlist_search(memories, "reg-names", "shrdram2");
+ priv->pruss_shrdram2 = ofnode_get_addr_size_index(memories, idx,
+ (u64 *)&priv->pruss_shrdram2sz);
+
+ ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, sub_node,
+ &syscon);
+
+ regmap_cfg = syscon_get_regmap(syscon);
+
+ /*
+ * 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(regmap_cfg, ICSSG_CFG_CORE_SYNC,
+ ICSSG_CORE_VBUSP_SYNC_EN,
+ ICSSG_CORE_VBUSP_SYNC_EN);
+ if (ret)
+ return ret;
+ ret = regmap_update_bits(regmap_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_alloc_size = sizeof(struct pruss),
+};
diff --git a/include/ti-pruss.h b/include/ti-pruss.h
new file mode 100644
index 0000000000..dd36152578
--- /dev/null
+++ b/include/ti-pruss.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef __TI_PRUSS_H_
+#define __TI_PRUSS_H_
+
+struct pruss {
+ phys_addr_t pruss_dram0;
+ phys_addr_t pruss_dram1;
+ phys_addr_t pruss_shrdram2;
+ phys_size_t pruss_dram0sz;
+ phys_size_t pruss_dram1sz;
+ phys_size_t pruss_shrdram2sz;
+};
+
+int pruss_request_shrmem_region(struct udevice *dev, phys_addr_t *loc);
+int pruss_request_tm_region(struct udevice *dev, phys_addr_t *loc);
+#endif /* __TI_PRUSS_H_ */
--
2.17.1
More information about the U-Boot
mailing list