@@ -522,6 +522,7 @@ F: drivers/sysreset/sysreset-ti-sci.c
F: drivers/thermal/ti-bandgap.c
F: drivers/timer/omap-timer.c
F: drivers/watchdog/omap_wdt.c
+F: include/linux/pruss_driver.h
F: include/linux/soc/ti/
ARM U8500
@@ -23,4 +23,15 @@ 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
@@ -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
new file mode 100644
@@ -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),
+};
new file mode 100644
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef __TI_PRUSS_H
+#define __TI_PRUSS_H
+
+/*
+ * PRU_ICSS_CFG registers
+ * SYSCFG, ISRP, ISP, IESP, IECP, SCRP applicable on AMxxxx devices only
+ */
+#define PRUSS_CFG_REVID 0x00
+#define PRUSS_CFG_SYSCFG 0x04
+#define PRUSS_CFG_GPCFG(x) (0x08 + (x) * 4)
+#define PRUSS_CFG_CGR 0x10
+#define PRUSS_CFG_ISRP 0x14
+#define PRUSS_CFG_ISP 0x18
+#define PRUSS_CFG_IESP 0x1C
+#define PRUSS_CFG_IECP 0x20
+#define PRUSS_CFG_SCRP 0x24
+#define PRUSS_CFG_PMAO 0x28
+#define PRUSS_CFG_MII_RT 0x2C
+#define PRUSS_CFG_IEPCLK 0x30
+#define PRUSS_CFG_SPP 0x34
+#define PRUSS_CFG_PIN_MX 0x40
+
+/* PRUSS_GPCFG register bits */
+#define PRUSS_GPCFG_PRU_GPO_SH_SEL BIT(25)
+
+#define PRUSS_GPCFG_PRU_DIV1_SHIFT 20
+#define PRUSS_GPCFG_PRU_DIV1_MASK GENMASK(24, 20)
+
+#define PRUSS_GPCFG_PRU_DIV0_SHIFT 15
+#define PRUSS_GPCFG_PRU_DIV0_MASK GENMASK(15, 19)
+
+#define PRUSS_GPCFG_PRU_GPO_MODE BIT(14)
+#define PRUSS_GPCFG_PRU_GPO_MODE_DIRECT 0
+#define PRUSS_GPCFG_PRU_GPO_MODE_SERIAL BIT(14)
+
+#define PRUSS_GPCFG_PRU_GPI_SB BIT(13)
+
+#define PRUSS_GPCFG_PRU_GPI_DIV1_SHIFT 8
+#define PRUSS_GPCFG_PRU_GPI_DIV1_MASK GENMASK(12, 8)
+
+#define PRUSS_GPCFG_PRU_GPI_DIV0_SHIFT 3
+#define PRUSS_GPCFG_PRU_GPI_DIV0_MASK GENMASK(7, 3)
+
+#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_POSITIVE 0
+#define PRUSS_GPCFG_PRU_GPI_CLK_MODE_NEGATIVE BIT(2)
+#define PRUSS_GPCFG_PRU_GPI_CLK_MODE BIT(2)
+
+#define PRUSS_GPCFG_PRU_GPI_MODE_MASK GENMASK(1, 0)
+#define PRUSS_GPCFG_PRU_GPI_MODE_SHIFT 0
+
+#define PRUSS_GPCFG_PRU_MUX_SEL_SHIFT 26
+#define PRUSS_GPCFG_PRU_MUX_SEL_MASK GENMASK(29, 26)
+
+/* PRUSS_MII_RT register bits */
+#define PRUSS_MII_RT_EVENT_EN BIT(0)
+
+/* PRUSS_SPP register bits */
+#define PRUSS_SPP_PRU1_PAD_HP_EN BIT(0)
+#define PRUSS_SPP_XFER_SHIFT_EN BIT(1)
+#define PRUSS_SPP_XFR_BYTE_SHIFT_EN BIT(2)
+#define PRUSS_SPP_RTU_XFR_SHIFT_EN BIT(3)
+
+/**
+ * enum pruss_gp_mux_sel - PRUSS GPI/O Mux modes for the
+ * PRUSS_GPCFG0/1 registers
+ *
+ * NOTE: The below defines are the most common values, but there
+ * are some exceptions like on 66AK2G, where the RESERVED and MII2
+ * values are interchanged. Also, this bit-field does not exist on
+ * AM335x SoCs
+ */
+enum pruss_gp_mux_sel {
+ PRUSS_GP_MUX_SEL_GP = 0,
+ PRUSS_GP_MUX_SEL_ENDAT,
+ PRUSS_GP_MUX_SEL_RESERVED,
+ PRUSS_GP_MUX_SEL_SD,
+ PRUSS_GP_MUX_SEL_MII2,
+ PRUSS_GP_MUX_SEL_MAX,
+};
+
+/**
+ * enum pruss_gpi_mode - PRUSS GPI configuration modes, used
+ * to program the PRUSS_GPCFG0/1 registers
+ */
+enum pruss_gpi_mode {
+ PRUSS_GPI_MODE_DIRECT = 0,
+ PRUSS_GPI_MODE_PARALLEL,
+ PRUSS_GPI_MODE_28BIT_SHIFT,
+ PRUSS_GPI_MODE_MII,
+};
+
+/**
+ * enum pruss_pru_id - PRU core identifiers
+ */
+enum pruss_pru_id {
+ PRUSS_PRU0 = 0,
+ PRUSS_PRU1,
+ PRUSS_NUM_PRUS,
+};
+
+/**
+ * enum pru_ctable_idx - Configurable Constant table index identifiers
+ */
+enum pru_ctable_idx {
+ PRU_C24 = 0,
+ PRU_C25,
+ PRU_C26,
+ PRU_C27,
+ PRU_C28,
+ PRU_C29,
+ PRU_C30,
+ PRU_C31,
+};
+
+/**
+ * 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 for config region
+ * @mem_regions: data for each of the PRUSS memory regions
+ * @mem_in_use: to indicate if memory resource is in use
+ */
+struct pruss {
+ struct udevice *dev;
+ struct regmap *cfg;
+ struct pruss_mem_region mem_regions[PRUSS_MEM_MAX];
+ struct pruss_mem_region *mem_in_use[PRUSS_MEM_MAX];
+};
+
+int pruss_request_tm_region(struct udevice *dev, phys_addr_t *loc);
+int pruss_request_mem_region(struct udevice *dev, enum pruss_mem mem_id,
+ struct pruss_mem_region *region);
+int pruss_release_mem_region(struct udevice *dev, struct pruss_mem_region *region);
+int pruss_cfg_update(struct udevice *dev, unsigned int reg,
+ unsigned int mask, unsigned int val);
+
+/**
+ * pruss_cfg_gpimode() - set the GPI mode of the PRU
+ * @dev: the pruss device
+ * @pru_id: the rproc instance handle of the PRU
+ * @mode: GPI mode to set
+ *
+ * Sets the GPI mode for a given PRU by programming the
+ * corresponding PRUSS_CFG_GPCFGx register
+ *
+ * Returns 0 on success, or an error code otherwise
+ */
+static inline int pruss_cfg_gpimode(struct udevice *dev, enum pruss_pru_id id,
+ enum pruss_gpi_mode mode)
+{
+ if (id < 0)
+ return -EINVAL;
+
+ return pruss_cfg_update(dev, PRUSS_CFG_GPCFG(id),
+ PRUSS_GPCFG_PRU_GPI_MODE_MASK,
+ mode << PRUSS_GPCFG_PRU_GPI_MODE_SHIFT);
+}
+
+/**
+ * pruss_cfg_miirt_enable() - Enable/disable MII RT Events
+ * @dev: the pruss device
+ * @enable: enable/disable
+ *
+ * Enable/disable the MII RT Events for the PRUSS.
+ */
+static inline int pruss_cfg_miirt_enable(struct udevice *dev, bool enable)
+{
+ u32 set = enable ? PRUSS_MII_RT_EVENT_EN : 0;
+
+ return pruss_cfg_update(dev, PRUSS_CFG_MII_RT,
+ PRUSS_MII_RT_EVENT_EN, set);
+}
+
+/**
+ * pruss_cfg_xfr_enable() - Enable/disable XIN XOUT shift functionality
+ * @dev: the pruss device
+ * @enable: enable/disable
+ */
+static inline int pruss_cfg_xfr_enable(struct udevice *dev, bool enable)
+{
+ u32 set = enable ? PRUSS_SPP_XFER_SHIFT_EN : 0;
+
+ return pruss_cfg_update(dev, PRUSS_CFG_SPP,
+ PRUSS_SPP_XFER_SHIFT_EN, set);
+}
+
+/**
+ * pruss_cfg_set_gpmux() - set the GPMUX value for a PRU device
+ * @pruss: pruss device
+ * @pru_id: PRU identifier (0-1)
+ * @mux: new mux value for PRU
+ */
+static inline int pruss_cfg_set_gpmux(struct udevice *dev,
+ enum pruss_pru_id id, u8 mux)
+{
+ if (mux >= PRUSS_GP_MUX_SEL_MAX)
+ return -EINVAL;
+
+ return pruss_cfg_update(dev, PRUSS_CFG_GPCFG(id),
+ PRUSS_GPCFG_PRU_MUX_SEL_MASK,
+ (u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+}
+
+#endif /* __TI_PRUSS_H */