@@ -197,6 +197,20 @@ config ST_REMOTEPROC
config ST_SLIM_REMOTEPROC
tristate
+config PRUSS_REMOTEPROC
+ tristate "TI PRUSS remoteproc support"
+ depends on TI_PRUSS
+ default n
+ help
+ Support for TI PRU-ICSS remote processors via the remote processor
+ framework.
+
+ Currently supported on AM33xx SoCs.
+
+ 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 # REMOTEPROC
endmenu
@@ -26,3 +26,4 @@ qcom_wcnss_pil-y += qcom_wcnss.o
qcom_wcnss_pil-y += qcom_wcnss_iris.o
obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
+obj-$(CONFIG_PRUSS_REMOTEPROC) += pru_rproc.o
new file mode 100644
@@ -0,0 +1,930 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PRU-ICSS remoteproc driver for various TI SoCs
+ *
+ * Copyright (C) 2014-2019 Texas Instruments Incorporated - http://www.ti.com/
+ * Suman Anna <s-anna@ti.com>
+ * Andrew F. Davis <afd@ti.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/debugfs.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip/irq-pruss-intc.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/remoteproc.h>
+#include <linux/remoteproc/pru_rproc.h>
+#include <linux/pruss.h>
+
+#include "remoteproc_internal.h"
+#include "pru_rproc.h"
+
+/* ELF PAGE ID */
+#define PRU_PAGE_IRAM 0
+#define PRU_PAGE_DRAM 1
+
+/* IRAM offsets */
+#define PRU0_IRAM_START 0x34000
+#define PRU1_IRAM_START 0x38000
+#define PRU_IRAM_MASK 0x3ffff
+
+/* PRU_ICSS_PRU_CTRL registers */
+#define PRU_CTRL_CTRL 0x0000
+#define PRU_CTRL_STS 0x0004
+#define PRU_CTRL_WAKEUP_EN 0x0008
+#define PRU_CTRL_CYCLE 0x000C
+#define PRU_CTRL_STALL 0x0010
+#define PRU_CTRL_CTBIR0 0x0020
+#define PRU_CTRL_CTBIR1 0x0024
+#define PRU_CTRL_CTPPR0 0x0028
+#define PRU_CTRL_CTPPR1 0x002C
+
+/* CTRL register bit-fields */
+#define CTRL_CTRL_SOFT_RST_N BIT(0)
+#define CTRL_CTRL_EN BIT(1)
+#define CTRL_CTRL_SLEEPING BIT(2)
+#define CTRL_CTRL_CTR_EN BIT(3)
+#define CTRL_CTRL_SINGLE_STEP BIT(8)
+#define CTRL_CTRL_RUNSTATE BIT(15)
+
+/* PRU_ICSS_PRU_DEBUG registers */
+#define PRU_DEBUG_GPREG(x) (0x0000 + (x) * 4)
+#define PRU_DEBUG_CT_REG(x) (0x0080 + (x) * 4)
+
+/**
+ * struct pru_rproc - PRU remoteproc structure
+ * @id: id of the PRU core within the PRUSS
+ * @pruss: back-reference to parent PRUSS structure
+ * @rproc: remoteproc pointer for this PRU core
+ * @iram_region: PRU IRAM IOMEM
+ * @ctrl_regmap: regmap to PRU CTRL IOMEM
+ * @debug_regmap: regmap to PRU DEBUG IOMEM
+ * @client_np: client device node
+ * @intc_config: PRU INTC configuration data
+ * @dram0: PRUSS DRAM0 region
+ * @dram1: PRUSS DRAM1 region
+ * @shrdram: PRUSS SHARED RAM region
+ * @iram_da: device address of Instruction RAM for this PRU
+ * @pdram_da: device address of primary Data RAM for this PRU
+ * @sdram_da: device address of secondary Data RAM for this PRU
+ * @shrdram_da: device address of shared Data RAM
+ * @cfg: regmap to CFG module
+ * @gpcfg_reg: offset to gpcfg register of this PRU
+ * @fw_name: name of firmware image used during loading
+ * @gpmux_save: saved value for gpmux config
+ * @dt_irqs: number of irqs configured from DT
+ * @fw_irqs: number of irqs configured from FW
+ * @lock: mutex to protect client usage
+ * @dbg_single_step: debug state variable to set PRU into single step mode
+ * @ctrl_saved_state: saved CTRL state to return to normal mode
+ */
+struct pru_rproc {
+ int id;
+ struct pruss *pruss;
+ struct rproc *rproc;
+ struct pruss_mem_region iram_region;
+ struct regmap *ctrl_regmap;
+ struct regmap *debug_regmap;
+ struct device_node *client_np;
+ struct pruss_intc_config intc_config;
+ struct pruss_mem_region dram0;
+ struct pruss_mem_region dram1;
+ struct pruss_mem_region shrdram;
+ u32 iram_da;
+ u32 pdram_da;
+ u32 sdram_da;
+ u32 shrdram_da;
+ struct regmap *cfg;
+ int gpcfg_reg;
+ const char *fw_name;
+ u8 gpmux_save;
+ int dt_irqs;
+ int fw_irqs;
+ struct mutex lock; /* client access lock */
+ bool dbg_single_step;
+ u32 ctrl_saved_state;
+};
+
+/**
+ * pru_rproc_set_firmware() - set firmware for a pru core
+ * @rproc: the rproc instance of the PRU
+ * @fw_name: the new firmware name, or NULL if default is desired
+ */
+static int pru_rproc_set_firmware(struct rproc *rproc, const char *fw_name)
+{
+ struct pru_rproc *pru = rproc->priv;
+
+ if (!fw_name)
+ fw_name = pru->fw_name;
+
+ return rproc_set_firmware(rproc, fw_name);
+}
+
+/*
+ * pru_get_gpmux() - get the current GPMUX value for a PRU device
+ * @pru: pru_rproc instance
+ * @mux: pointer to store the current mux value into
+ *
+ * returns 0 on success, negative error value otherwise.
+ */
+static int pru_get_gpmux(struct pru_rproc *pru, u8 *mux)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(pru->cfg, pru->gpcfg_reg, &val);
+ if (ret)
+ return ret;
+
+ *mux = (u8)((val & PRUSS_GPCFG_PRU_MUX_SEL_MASK) >>
+ PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+
+ return 0;
+}
+
+/**
+ * pru_set_gpmux() - set the GPMUX value for a PRU device
+ * @pru: pru_rproc instance
+ * @mux: new mux value for PRU
+ *
+ * returns 0 on success, negative error value otherwise.
+ */
+static int pru_set_gpmux(struct pru_rproc *pru, u8 mux)
+{
+ if (mux >= PRUSS_GP_MUX_SEL_MAX)
+ return -EINVAL;
+
+ return regmap_update_bits(pru->cfg, pru->gpcfg_reg,
+ PRUSS_GPCFG_PRU_MUX_SEL_MASK,
+ (u32)mux << PRUSS_GPCFG_PRU_MUX_SEL_SHIFT);
+}
+
+static int pru_get_intc_dt_config(struct pru_rproc *pru,
+ const char *propname, int index,
+ struct pruss_intc_config *intc_config)
+{
+ struct device *dev = &pru->rproc->dev;
+ struct device_node *np = pru->client_np;
+ struct property *prop;
+ int ret = 0, entries, i;
+ int dt_irqs = 0;
+ u32 *arr;
+ int max_system_events, max_pru_channels, max_pru_host_ints;
+
+ max_system_events = MAX_PRU_SYS_EVENTS;
+ max_pru_channels = MAX_PRU_CHANNELS;
+ max_pru_host_ints = MAX_PRU_CHANNELS;
+
+ prop = of_find_property(np, propname, NULL);
+ if (!prop)
+ return 0;
+
+ entries = of_property_count_u32_elems(np, propname);
+ if (entries <= 0 || entries % 4)
+ return -EINVAL;
+
+ arr = kmalloc_array(entries, sizeof(u32), GFP_KERNEL);
+ if (!arr)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, propname, arr, entries);
+ if (ret)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(intc_config->sysev_to_ch); i++)
+ intc_config->sysev_to_ch[i] = -1;
+
+ for (i = 0; i < ARRAY_SIZE(intc_config->ch_to_host); i++)
+ intc_config->ch_to_host[i] = -1;
+
+ for (i = 0; i < entries; i += 4) {
+ if (arr[i] != index)
+ continue;
+
+ if (arr[i + 1] < 0 ||
+ arr[i + 1] >= max_system_events) {
+ dev_err(dev, "bad sys event %d\n", arr[i + 1]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (arr[i + 2] < 0 ||
+ arr[i + 2] >= max_pru_channels) {
+ dev_err(dev, "bad channel %d\n", arr[i + 2]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (arr[i + 3] < 0 ||
+ arr[i + 3] >= max_pru_host_ints) {
+ dev_err(dev, "bad irq %d\n", arr[i + 3]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ intc_config->sysev_to_ch[arr[i + 1]] = arr[i + 2];
+ dev_dbg(dev, "sysevt-to-ch[%d] -> %d\n", arr[i + 1],
+ arr[i + 2]);
+
+ intc_config->ch_to_host[arr[i + 2]] = arr[i + 3];
+ dev_dbg(dev, "chnl-to-host[%d] -> %d\n", arr[i + 2],
+ arr[i + 3]);
+
+ dt_irqs++;
+ }
+
+ kfree(arr);
+ return dt_irqs;
+
+err:
+ kfree(arr);
+ return ret;
+}
+
+static struct rproc *__pru_rproc_get(struct device_node *np, int index)
+{
+ struct device_node *rproc_np = NULL;
+ struct platform_device *pdev;
+ struct rproc *rproc;
+
+ rproc_np = of_parse_phandle(np, "prus", index);
+ if (!rproc_np || !of_device_is_available(rproc_np))
+ return ERR_PTR(-ENODEV);
+
+ pdev = of_find_device_by_node(rproc_np);
+ of_node_put(rproc_np);
+
+ if (!pdev)
+ /* probably PRU not yet probed */
+ return ERR_PTR(-EPROBE_DEFER);
+
+ /* TODO: replace the crude string based check to make sure it is PRU */
+ if (!strstr(dev_name(&pdev->dev), "pru")) {
+ put_device(&pdev->dev);
+ return ERR_PTR(-ENODEV);
+ }
+
+ rproc = platform_get_drvdata(pdev);
+ put_device(&pdev->dev);
+ if (!rproc)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ get_device(&rproc->dev);
+
+ return rproc;
+}
+
+/**
+ * pru_rproc_get() - get the PRU rproc instance from a device node
+ * @np: the user/client device node
+ * @index: index to use for the prus property
+ *
+ * This function looks through a client device node's "prus" property at index
+ * @index and returns the rproc handle for a valid PRU remote processor if
+ * found. The function allows only one user to own the PRU rproc resource at
+ * a time. Caller must call pru_rproc_put() when done with using the rproc,
+ * not required if the function returns a failure.
+ *
+ * Returns the rproc handle on success, and an ERR_PTR on failure using one
+ * of the following error values
+ * -ENODEV if device is not found
+ * -EBUSY if PRU is already acquired by anyone
+ * -EPROBE_DEFER is PRU device is not probed yet
+ */
+struct rproc *pru_rproc_get(struct device_node *np, int index)
+{
+ struct rproc *rproc;
+ struct pru_rproc *pru;
+ struct device *dev;
+ int ret;
+ u32 mux;
+ const char *fw_name;
+
+ rproc = __pru_rproc_get(np, index);
+ if (IS_ERR(rproc))
+ return rproc;
+
+ pru = rproc->priv;
+ dev = &rproc->dev;
+
+ mutex_lock(&pru->lock);
+
+ if (pru->client_np) {
+ mutex_unlock(&pru->lock);
+ put_device(&rproc->dev);
+ return ERR_PTR(-EBUSY);
+ }
+
+ pru->client_np = np;
+
+ mutex_unlock(&pru->lock);
+
+ ret = pru_get_gpmux(pru, &pru->gpmux_save);
+ if (ret) {
+ dev_err(dev, "failed to get cfg gpmux: %d\n", ret);
+ goto err;
+ }
+
+ ret = of_property_read_u32_index(np, "ti,pruss-gp-mux-sel", index,
+ &mux);
+ if (!ret) {
+ ret = pru_set_gpmux(pru, mux);
+ if (ret) {
+ dev_err(dev, "failed to set cfg gpmux: %d\n", ret);
+ goto err;
+ }
+ }
+
+ ret = of_property_read_string_index(np, "firmware-name", index,
+ &fw_name);
+ if (!ret) {
+ ret = pru_rproc_set_firmware(rproc, fw_name);
+ if (ret) {
+ dev_err(dev, "failed to set firmware: %d\n", ret);
+ goto err;
+ }
+ }
+
+ ret = pru_get_intc_dt_config(pru, "ti,pru-interrupt-map",
+ index, &pru->intc_config);
+ if (ret < 0) {
+ dev_err(dev, "error getting DT interrupt map: %d\n", ret);
+ goto err;
+ }
+
+ pru->dt_irqs = ret;
+
+ return rproc;
+
+err:
+ pru_rproc_put(rproc);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(pru_rproc_get);
+
+/**
+ * pru_rproc_put() - release the PRU rproc resource
+ * @rproc: the rproc resource to release
+ *
+ * Releases the PRU rproc resource and makes it available to other
+ * users.
+ */
+void pru_rproc_put(struct rproc *rproc)
+{
+ struct pru_rproc *pru;
+
+ if (IS_ERR_OR_NULL(rproc))
+ return;
+
+ /* TODO: replace the crude string based check to make sure it is PRU */
+ if (!strstr(dev_name(rproc->dev.parent), "pru"))
+ return;
+
+ pru = rproc->priv;
+ if (!pru->client_np)
+ return;
+
+ pru_rproc_set_firmware(rproc, NULL);
+ pru_set_gpmux(pru, pru->gpmux_save);
+
+ mutex_lock(&pru->lock);
+ pru->client_np = NULL;
+ mutex_unlock(&pru->lock);
+
+ put_device(&rproc->dev);
+}
+EXPORT_SYMBOL_GPL(pru_rproc_put);
+
+/*
+ * Control PRU single-step mode
+ *
+ * This is a debug helper function used for controlling the single-step
+ * mode of the PRU. The PRU Debug registers are not accessible when the
+ * PRU is in RUNNING state.
+ *
+ * Writing a non-zero value sets the PRU into single-step mode irrespective
+ * of its previous state. The PRU mode is saved only on the first set into
+ * a single-step mode. Writing a zero value will restore the PRU into its
+ * original mode.
+ */
+static int pru_rproc_debug_ss_set(void *data, u64 val)
+{
+ struct rproc *rproc = data;
+ struct pru_rproc *pru = rproc->priv;
+ u32 reg_val;
+ bool debug_ss;
+
+ debug_ss = !!val;
+ if (!debug_ss && !pru->dbg_single_step)
+ return 0;
+
+ regmap_read(pru->ctrl_regmap, PRU_CTRL_CTRL, ®_val);
+
+ if (debug_ss && !pru->dbg_single_step)
+ pru->ctrl_saved_state = reg_val;
+
+ if (debug_ss)
+ reg_val |= CTRL_CTRL_SINGLE_STEP | CTRL_CTRL_EN;
+ else
+ reg_val = pru->ctrl_saved_state;
+
+ pru->dbg_single_step = debug_ss;
+ regmap_write(pru->ctrl_regmap, PRU_CTRL_CTRL, reg_val);
+
+ return 0;
+}
+
+static int pru_rproc_debug_ss_get(void *data, u64 *val)
+{
+ struct rproc *rproc = data;
+ struct pru_rproc *pru = rproc->priv;
+
+ *val = pru->dbg_single_step;
+
+ return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(pru_rproc_debug_ss_fops, pru_rproc_debug_ss_get,
+ pru_rproc_debug_ss_set, "%llu\n");
+
+/*
+ * Create PRU-specific debugfs entries
+ *
+ * The entries are created only if the parent remoteproc debugfs directory
+ * exists, and will be cleaned up by the remoteproc core.
+ */
+static void pru_rproc_create_debug_entries(struct rproc *rproc)
+{
+ if (!rproc->dbg_dir)
+ return;
+
+ debugfs_create_file("single_step", 0600, rproc->dbg_dir,
+ rproc, &pru_rproc_debug_ss_fops);
+}
+
+static void *pru_d_da_to_va(struct pru_rproc *pru, u32 da, int len);
+
+/*
+ * parse the custom interrupt map resource and save the intc_config
+ * for use when booting the processor.
+ */
+static int pru_handle_vendor_intrmap(struct rproc *rproc,
+ struct fw_rsc_pruss_intrmap *rsc)
+{
+ int fw_irqs = 0, i, ret = 0;
+ u8 *arr;
+ struct device *dev = &rproc->dev;
+ struct pru_rproc *pru = rproc->priv;
+
+ dev_dbg(dev, "vendor rsc intc: version %d\n", rsc->version);
+
+ /*
+ * 0 was prototyping version. Not supported.
+ * 1 is currently supported version.
+ */
+ if (rsc->version == 0 || rsc->version > 1) {
+ dev_err(dev, "Unsupported version %d\n", rsc->version);
+ return -EINVAL;
+ }
+
+ /* DT provided INTC config takes precedence */
+ if (pru->dt_irqs) {
+ dev_info(dev, "INTC config in DT and FW. Using DT config.\n");
+ return 0;
+ }
+
+ arr = rsc->data;
+
+ for (i = 0; i < ARRAY_SIZE(pru->intc_config.sysev_to_ch); i++)
+ pru->intc_config.sysev_to_ch[i] = -1;
+
+ for (i = 0; i < ARRAY_SIZE(pru->intc_config.ch_to_host); i++)
+ pru->intc_config.ch_to_host[i] = -1;
+
+ for (i = 0; i < rsc->num_maps * 3; i += 3) {
+ if (arr[i] < 0 ||
+ arr[i] >= MAX_PRU_SYS_EVENTS) {
+ dev_err(dev, "bad sys event %d\n", arr[i]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (arr[i + 1] < 0 ||
+ arr[i + 1] >= MAX_PRU_CHANNELS) {
+ dev_err(dev, "bad channel %d\n", arr[i + 1]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (arr[i + 2] < 0 ||
+ arr[i + 2] >= MAX_PRU_CHANNELS) {
+ dev_err(dev, "bad host irq %d\n", arr[i + 2]);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ pru->intc_config.sysev_to_ch[arr[i]] = arr[i + 1];
+ dev_dbg(dev, "sysevt-to-ch[%d] -> %d\n", arr[i],
+ arr[i + 1]);
+
+ pru->intc_config.ch_to_host[arr[i + 1]] = arr[i + 2];
+ dev_dbg(dev, "chnl-to-host[%d] -> %d\n", arr[i + 1],
+ arr[i + 2]);
+
+ fw_irqs++;
+ }
+
+ pru->fw_irqs = fw_irqs;
+ return 0;
+
+err:
+ pru->fw_irqs = 0;
+ return ret;
+}
+
+/* PRU-specific vendor resource handler */
+static int pru_rproc_handle_vendor_rsc(struct rproc *rproc,
+ struct fw_rsc_vendor *ven_rsc)
+{
+ struct device *dev = rproc->dev.parent;
+ int ret = -EINVAL;
+
+ struct fw_rsc_pruss_intrmap *rsc;
+
+ rsc = (struct fw_rsc_pruss_intrmap *)ven_rsc->data;
+
+ switch (rsc->type) {
+ case PRUSS_RSC_INTRS:
+ ret = pru_handle_vendor_intrmap(rproc, rsc);
+ break;
+ default:
+ dev_err(dev, "%s: cannot handle unknown type %d\n", __func__,
+ rsc->type);
+ }
+
+ return ret;
+}
+
+/* start a PRU core */
+static int pru_rproc_start(struct rproc *rproc)
+{
+ struct device *dev = &rproc->dev;
+ struct pru_rproc *pru = rproc->priv;
+ u32 val;
+ int ret;
+
+ dev_dbg(dev, "starting PRU%d: entry-point = 0x%x\n",
+ pru->id, (rproc->bootaddr >> 2));
+
+ if (pru->dt_irqs || pru->fw_irqs) {
+ ret = pruss_intc_configure(rproc->dev.parent,
+ &pru->intc_config);
+ if (ret) {
+ dev_err(dev, "failed to configure intc %d\n", ret);
+ return ret;
+ }
+ }
+
+ val = CTRL_CTRL_EN | ((rproc->bootaddr >> 2) << 16);
+ regmap_write(pru->ctrl_regmap, PRU_CTRL_CTRL, val);
+
+ return 0;
+}
+
+/* stop/disable a PRU core */
+static int pru_rproc_stop(struct rproc *rproc)
+{
+ struct device *dev = &rproc->dev;
+ struct pru_rproc *pru = rproc->priv;
+
+ dev_dbg(dev, "stopping PRU%d\n", pru->id);
+ regmap_update_bits(pru->ctrl_regmap, PRU_CTRL_CTRL, CTRL_CTRL_EN, 0);
+
+ /* undo INTC config */
+ if (pru->dt_irqs || pru->fw_irqs)
+ pruss_intc_unconfigure(rproc->dev.parent, &pru->intc_config);
+
+ return 0;
+}
+
+/*
+ * Convert PRU device address (data spaces only) to kernel virtual address
+ *
+ * Each PRU has access to all data memories within the PRUSS, accessible at
+ * different ranges. So, look through both its primary and secondary Data
+ * RAMs as well as any shared Data RAM to convert a PRU device address to
+ * kernel virtual address. Data RAM0 is primary Data RAM for PRU0 and Data
+ * RAM1 is primary Data RAM for PRU1.
+ */
+static void *pru_d_da_to_va(struct pru_rproc *pru, u32 da, int len)
+{
+ struct pruss_mem_region dram0, dram1, shrd_ram;
+ u32 offset;
+ void *va = NULL;
+
+ if (len <= 0)
+ return NULL;
+
+ dram0 = pru->dram0;
+ dram1 = pru->dram1;
+ /* PRU1 has its local RAM addresses reversed */
+ if (pru->id == 1)
+ swap(dram0, dram1);
+ shrd_ram = pru->shrdram;
+
+ if (da >= pru->pdram_da && da + len <= pru->pdram_da + dram0.size) {
+ offset = da - pru->pdram_da;
+ va = (__force void *)(dram0.va + offset);
+ } else if (da >= pru->sdram_da &&
+ da + len <= pru->sdram_da + dram1.size) {
+ offset = da - pru->sdram_da;
+ va = (__force void *)(dram1.va + offset);
+ } else if (da >= pru->shrdram_da &&
+ da + len <= pru->shrdram_da + shrd_ram.size) {
+ offset = da - pru->shrdram_da;
+ va = (__force void *)(shrd_ram.va + offset);
+ }
+
+ return va;
+}
+
+/*
+ * Convert PRU device address (instruction space) to kernel virtual address
+ *
+ * A PRU does not have an unified address space. Each PRU has its very own
+ * private Instruction RAM, and its device address is identical to that of
+ * its primary Data RAM device address.
+ */
+static void *pru_i_da_to_va(struct pru_rproc *pru, u32 da, int len)
+{
+ u32 offset;
+ void *va = NULL;
+
+ if (len <= 0)
+ return NULL;
+
+ if (da >= pru->iram_da &&
+ da + len <= pru->iram_da + pru->iram_region.size) {
+ offset = da - pru->iram_da;
+ va = (__force void *)(pru->iram_region.va + offset);
+ }
+
+ return va;
+}
+
+/* PRU-specific address translator */
+static void *pru_da_to_va(struct rproc *rproc, u64 da, int len, int map)
+{
+ struct pru_rproc *pru = rproc->priv;
+ void *va;
+
+ switch (map) {
+ case PRU_PAGE_IRAM:
+ va = pru_i_da_to_va(pru, da, len);
+ break;
+ case PRU_PAGE_DRAM:
+ va = pru_d_da_to_va(pru, da, len);
+ break;
+ default:
+ dev_info(&rproc->dev, "%s: invalid page %d\n", __func__, map);
+ return 0;
+ };
+
+ return va;
+}
+
+static struct rproc_ops pru_rproc_ops = {
+ .start = pru_rproc_start,
+ .stop = pru_rproc_stop,
+ .da_to_va = pru_da_to_va,
+ .handle_vendor_rsc = pru_rproc_handle_vendor_rsc,
+};
+
+static int pru_rproc_set_id(struct pru_rproc *pru)
+{
+ int ret = 0;
+ u32 iram_start = pru->iram_region.pa & PRU_IRAM_MASK;
+
+ if (iram_start == PRU0_IRAM_START)
+ pru->id = 0;
+ else if (iram_start == PRU1_IRAM_START)
+ pru->id = 1;
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static struct regmap_config pru_ctrl_regmap_config = {
+ .name = "ctrl",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = PRU_CTRL_CTPPR1,
+};
+
+static struct regmap_config pru_debug_regmap_config = {
+ .name = "debug",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = PRU_DEBUG_CT_REG(31),
+};
+
+static int pru_rproc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct platform_device *ppdev = to_platform_device(dev->parent);
+ struct pru_rproc *pru;
+ const char *fw_name;
+ struct rproc *rproc = NULL;
+ struct resource *res;
+ int ret;
+ void __iomem *va;
+
+ if (!np) {
+ dev_err(dev, "Non-DT platform device not supported\n");
+ return -ENODEV;
+ }
+
+ ret = of_property_read_string(np, "firmware-name", &fw_name);
+ if (ret) {
+ dev_err(dev, "unable to retrieve firmware-name %d\n", ret);
+ return ret;
+ }
+
+ rproc = rproc_alloc(dev, pdev->name, &pru_rproc_ops, fw_name,
+ sizeof(*pru));
+ if (!rproc) {
+ dev_err(dev, "rproc_alloc failed\n");
+ return -ENOMEM;
+ }
+
+ pru = rproc->priv;
+ pru->cfg = syscon_regmap_lookup_by_phandle(np, "gpcfg");
+ if (IS_ERR(pru->cfg)) {
+ if (PTR_ERR(pru->cfg) != -EPROBE_DEFER)
+ dev_err(dev, "can't get gpcfg syscon regmap\n");
+
+ return PTR_ERR(pru->cfg);
+ }
+
+ if (of_property_read_u32_index(np, "gpcfg", 1, &pru->gpcfg_reg)) {
+ dev_err(dev, "couldn't get gpcfg reg. offset\n");
+ return -EINVAL;
+ }
+
+ /* error recovery is not supported for PRUs */
+ rproc->recovery_disabled = true;
+
+ /*
+ * rproc_add will auto-boot the processor normally, but this is
+ * not desired with PRU client driven boot-flow methodology. A PRU
+ * application/client driver will boot the corresponding PRU
+ * remote-processor as part of its state machine either through
+ * the remoteproc sysfs interface or through the equivalent kernel API
+ */
+ rproc->auto_boot = false;
+
+ pru->pruss = platform_get_drvdata(ppdev);
+ pru->rproc = rproc;
+ pru->fw_name = fw_name;
+ mutex_init(&pru->lock);
+
+ ret = pruss_request_mem_region(pru->pruss, PRUSS_MEM_DRAM0,
+ &pru->dram0);
+ if (ret) {
+ dev_err(dev, "couldn't get PRUSS DRAM0: %d\n", ret);
+ return ret;
+ }
+ pruss_release_mem_region(pru->pruss, &pru->dram0);
+
+ ret = pruss_request_mem_region(pru->pruss, PRUSS_MEM_DRAM1,
+ &pru->dram1);
+ if (ret) {
+ dev_err(dev, "couldn't get PRUSS DRAM1: %d\n", ret);
+ return ret;
+ }
+ pruss_release_mem_region(pru->pruss, &pru->dram1);
+
+ ret = pruss_request_mem_region(pru->pruss, PRUSS_MEM_SHRD_RAM2,
+ &pru->shrdram);
+ if (ret) {
+ dev_err(dev, "couldn't get PRUSS Shared RAM: %d\n", ret);
+ return ret;
+ }
+ pruss_release_mem_region(pru->pruss, &pru->shrdram);
+
+ /* XXX: get this from match data if different in the future */
+ pru->iram_da = 0;
+ pru->pdram_da = 0;
+ pru->sdram_da = 0x2000;
+ pru->shrdram_da = 0x10000;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iram");
+ pru->iram_region.va = devm_ioremap_resource(dev, res);
+ if (IS_ERR(pru->iram_region.va)) {
+ ret = PTR_ERR(pru->iram_region.va);
+ dev_err(dev, "failed to get iram resource: %d\n", ret);
+ goto free_rproc;
+ }
+
+ pru->iram_region.pa = res->start;
+ pru->iram_region.size = resource_size(res);
+
+ dev_dbg(dev, "iram: pa %pa size 0x%zx va %p\n",
+ &pru->iram_region.pa, pru->iram_region.size,
+ pru->iram_region.va);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
+ va = devm_ioremap_resource(dev, res);
+ if (IS_ERR(va)) {
+ ret = PTR_ERR(va);
+ dev_err(dev, "failed to get control resource: %d\n", ret);
+ goto free_rproc;
+ }
+
+ pru->ctrl_regmap = devm_regmap_init_mmio(dev, va,
+ &pru_ctrl_regmap_config);
+ if (IS_ERR(pru->ctrl_regmap)) {
+ ret = PTR_ERR(pru->ctrl_regmap);
+ dev_err(dev, "CTRL regmap init failed: %d\n", ret);
+ goto free_rproc;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "debug");
+ va = devm_ioremap_resource(dev, res);
+ if (IS_ERR(va)) {
+ ret = PTR_ERR(va);
+ dev_err(dev, "failed to get debug resource: %d\n", ret);
+ goto free_rproc;
+ }
+ pru->debug_regmap = devm_regmap_init_mmio(dev, va,
+ &pru_debug_regmap_config);
+ if (IS_ERR(pru->debug_regmap)) {
+ ret = PTR_ERR(pru->debug_regmap);
+ dev_err(dev, "DEBUG regmap init failed: %d\n", ret);
+ goto free_rproc;
+ }
+
+ ret = pru_rproc_set_id(pru);
+ if (ret < 0)
+ goto free_rproc;
+
+ platform_set_drvdata(pdev, rproc);
+
+ ret = rproc_add(pru->rproc);
+ if (ret) {
+ dev_err(dev, "rproc_add failed: %d\n", ret);
+ goto free_rproc;
+ }
+
+ pru_rproc_create_debug_entries(rproc);
+
+ dev_info(dev, "PRU rproc node %s probed successfully\n", np->full_name);
+
+ return 0;
+
+free_rproc:
+ rproc_free(rproc);
+ return ret;
+}
+
+static int pru_rproc_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rproc *rproc = platform_get_drvdata(pdev);
+
+ dev_info(dev, "%s: removing rproc %s\n", __func__, rproc->name);
+
+ rproc_del(rproc);
+ rproc_free(rproc);
+
+ return 0;
+}
+
+static const struct of_device_id pru_rproc_match[] = {
+ { .compatible = "ti,am3356-pru", },
+ { .compatible = "ti,am4376-pru", },
+ { .compatible = "ti,am5728-pru", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pru_rproc_match);
+
+static struct platform_driver pru_rproc_driver = {
+ .driver = {
+ .name = "pru-rproc",
+ .of_match_table = pru_rproc_match,
+ .suppress_bind_attrs = true,
+ },
+ .probe = pru_rproc_probe,
+ .remove = pru_rproc_remove,
+};
+module_platform_driver(pru_rproc_driver);
+
+MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
+MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver");
+MODULE_LICENSE("GPL v2");
new file mode 100644
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
+/*
+ * PRUSS Remote Processor specific types
+ *
+ * Copyright (C) 2014-2019 Texas Instruments Incorporated - http://www.ti.com/
+ * All rights reserved.
+ */
+
+#ifndef _PRU_REMOTEPROC_H_
+#define _PRU_REMOTEPROC_H_
+
+/**
+ * enum pruss_rsc_types - PRU specific resource types
+ *
+ * @PRUSS_RSC_INTRS: Resource holding information on PRU PINTC configuration
+ * @PRUSS_RSC_MAX: Indicates end of known/defined PRU resource types.
+ * This should be the last definition.
+ *
+ * Introduce new custom resource types before PRUSS_RSC_MAX.
+ */
+enum pruss_rsc_types {
+ PRUSS_RSC_INTRS = 1,
+ PRUSS_RSC_MAX = 2,
+};
+
+/**
+ * struct fw_rsc_pruss_intrmap - vendor resource to define PRU interrupts
+ * @type: should be PRUSS_RSC_INTRS
+ * @version: should be 1 or greater. 0 was for prototyping and is not supported
+ * @num_maps: number of interrupt mappings that follow
+ * @data: Array of 'num_maps' mappings.
+ * Each mapping is a triplet {s, c, h}
+ * s - system event id
+ * c - channel id
+ * h - host interrupt id
+ *
+ * PRU system events are mapped to channels, and these channels are mapped
+ * to host interrupts. Events can be mapped to channels in a one-to-one or
+ * many-to-one ratio (multiple events per channel), and channels can be
+ * mapped to host interrupts in a one-to-one or many-to-one ratio (multiple
+ * channels per interrupt).
+ *
+ * This resource is variable length due to the nature of INTC map.
+ * The below data structure is scalable so it can support sufficiently
+ * large number of sysevents and hosts.
+ */
+struct fw_rsc_pruss_intrmap {
+ u16 type;
+ u16 version;
+ u8 num_maps;
+ u8 data[];
+} __packed;
+
+#endif /* _PRU_REMOTEPROC_H_ */
new file mode 100644
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/**
+ * PRU-ICSS Remote Subsystem user interfaces
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#ifndef __LINUX_REMOTEPROC_PRU_RPROC_H
+#define __LINUX_REMOTEPROC_PRU_RPROC_H
+
+#if IS_ENABLED(CONFIG_PRUSS_REMOTEPROC)
+
+struct rproc *pru_rproc_get(struct device_node *node, int index);
+void pru_rproc_put(struct rproc *rproc);
+
+#else
+
+static inline struct rproc *pru_rproc_get(struct device_node *node, int index)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
+
+static inline void pru_rproc_put(struct rproc *rproc) { }
+
+#endif /* CONFIG_PRUSS_REMOTEPROC */
+
+#endif /* __LINUX_REMOTEPROC_PRU_RPROC_H */