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@@ -0,0 +1,525 @@
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+/*
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+ * TI Keystone DSP remoteproc driver
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+ *
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+ * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/io.h>
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+#include <linux/interrupt.h>
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+#include <linux/platform_device.h>
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+#include <linux/pm_runtime.h>
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+#include <linux/workqueue.h>
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+#include <linux/of_address.h>
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+#include <linux/of_reserved_mem.h>
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+#include <linux/of_gpio.h>
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+#include <linux/regmap.h>
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+#include <linux/mfd/syscon.h>
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+#include <linux/remoteproc.h>
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+#include <linux/reset.h>
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+
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+#include "remoteproc_internal.h"
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+
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+#define KEYSTONE_RPROC_LOCAL_ADDRESS_MASK (SZ_16M - 1)
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+
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+/**
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+ * struct keystone_rproc_mem - internal memory structure
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+ * @cpu_addr: MPU virtual address of the memory region
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+ * @bus_addr: Bus address used to access the memory region
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+ * @dev_addr: Device address of the memory region from DSP view
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+ * @size: Size of the memory region
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+ */
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+struct keystone_rproc_mem {
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+ void __iomem *cpu_addr;
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+ phys_addr_t bus_addr;
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+ u32 dev_addr;
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+ size_t size;
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+};
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+
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+/**
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+ * struct keystone_rproc - keystone remote processor driver structure
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+ * @dev: cached device pointer
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+ * @rproc: remoteproc device handle
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+ * @mem: internal memory regions data
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+ * @num_mems: number of internal memory regions
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+ * @dev_ctrl: device control regmap handle
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+ * @reset: reset control handle
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+ * @boot_offset: boot register offset in @dev_ctrl regmap
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+ * @irq_ring: irq entry for vring
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+ * @irq_fault: irq entry for exception
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+ * @kick_gpio: gpio used for virtio kicks
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+ * @workqueue: workqueue for processing virtio interrupts
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+ */
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+struct keystone_rproc {
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+ struct device *dev;
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+ struct rproc *rproc;
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+ struct keystone_rproc_mem *mem;
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+ int num_mems;
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+ struct regmap *dev_ctrl;
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+ struct reset_control *reset;
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+ u32 boot_offset;
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+ int irq_ring;
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+ int irq_fault;
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+ int kick_gpio;
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+ struct work_struct workqueue;
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+};
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+
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+/* Put the DSP processor into reset */
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+static void keystone_rproc_dsp_reset(struct keystone_rproc *ksproc)
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+{
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+ reset_control_assert(ksproc->reset);
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+}
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+
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+/* Configure the boot address and boot the DSP processor */
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+static int keystone_rproc_dsp_boot(struct keystone_rproc *ksproc, u32 boot_addr)
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+{
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+ int ret;
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+
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+ if (boot_addr & (SZ_1K - 1)) {
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+ dev_err(ksproc->dev, "invalid boot address 0x%x, must be aligned on a 1KB boundary\n",
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+ boot_addr);
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+ return -EINVAL;
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+ }
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+
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+ ret = regmap_write(ksproc->dev_ctrl, ksproc->boot_offset, boot_addr);
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+ if (ret) {
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+ dev_err(ksproc->dev, "regmap_write of boot address failed, status = %d\n",
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+ ret);
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+ return ret;
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+ }
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+
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+ reset_control_deassert(ksproc->reset);
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+
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+ return 0;
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+}
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+
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+/*
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+ * Process the remoteproc exceptions
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+ *
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+ * The exception reporting on Keystone DSP remote processors is very simple
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+ * compared to the equivalent processors on the OMAP family, it is notified
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+ * through a software-designed specific interrupt source in the IPC interrupt
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+ * generation register.
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+ *
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+ * This function just invokes the rproc_report_crash to report the exception
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+ * to the remoteproc driver core, to trigger a recovery.
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+ */
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+static irqreturn_t keystone_rproc_exception_interrupt(int irq, void *dev_id)
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+{
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+ struct keystone_rproc *ksproc = dev_id;
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+
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+ rproc_report_crash(ksproc->rproc, RPROC_FATAL_ERROR);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * Main virtqueue message workqueue function
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+ *
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+ * This function is executed upon scheduling of the keystone remoteproc
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+ * driver's workqueue. The workqueue is scheduled by the vring ISR handler.
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+ *
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+ * There is no payload message indicating the virtqueue index as is the
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+ * case with mailbox-based implementations on OMAP family. As such, this
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+ * handler processes both the Tx and Rx virtqueue indices on every invocation.
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+ * The rproc_vq_interrupt function can detect if there are new unprocessed
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+ * messages or not (returns IRQ_NONE vs IRQ_HANDLED), but there is no need
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+ * to check for these return values. The index 0 triggering will process all
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+ * pending Rx buffers, and the index 1 triggering will process all newly
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+ * available Tx buffers and will wakeup any potentially blocked senders.
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+ *
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+ * NOTE:
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+ * 1. A payload could be added by using some of the source bits in the
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+ * IPC interrupt generation registers, but this would need additional
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+ * changes to the overall IPC stack, and currently there are no benefits
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+ * of adapting that approach.
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+ * 2. The current logic is based on an inherent design assumption of supporting
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+ * only 2 vrings, but this can be changed if needed.
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+ */
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+static void handle_event(struct work_struct *work)
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+{
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+ struct keystone_rproc *ksproc =
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+ container_of(work, struct keystone_rproc, workqueue);
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+
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+ rproc_vq_interrupt(ksproc->rproc, 0);
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+ rproc_vq_interrupt(ksproc->rproc, 1);
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+}
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+
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+/*
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+ * Interrupt handler for processing vring kicks from remote processor
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+ */
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+static irqreturn_t keystone_rproc_vring_interrupt(int irq, void *dev_id)
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+{
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+ struct keystone_rproc *ksproc = dev_id;
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+
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+ schedule_work(&ksproc->workqueue);
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+
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * Power up the DSP remote processor.
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+ *
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+ * This function will be invoked only after the firmware for this rproc
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+ * was loaded, parsed successfully, and all of its resource requirements
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+ * were met.
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+ */
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+static int keystone_rproc_start(struct rproc *rproc)
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+{
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+ struct keystone_rproc *ksproc = rproc->priv;
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+ int ret;
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+
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+ INIT_WORK(&ksproc->workqueue, handle_event);
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+
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+ ret = request_irq(ksproc->irq_ring, keystone_rproc_vring_interrupt, 0,
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+ dev_name(ksproc->dev), ksproc);
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+ if (ret) {
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+ dev_err(ksproc->dev, "failed to enable vring interrupt, ret = %d\n",
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+ ret);
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+ goto out;
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+ }
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+
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+ ret = request_irq(ksproc->irq_fault, keystone_rproc_exception_interrupt,
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+ 0, dev_name(ksproc->dev), ksproc);
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+ if (ret) {
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+ dev_err(ksproc->dev, "failed to enable exception interrupt, ret = %d\n",
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+ ret);
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+ goto free_vring_irq;
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+ }
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+
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+ ret = keystone_rproc_dsp_boot(ksproc, rproc->bootaddr);
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+ if (ret)
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+ goto free_exc_irq;
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+
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+ return 0;
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+
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+free_exc_irq:
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+ free_irq(ksproc->irq_fault, ksproc);
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+free_vring_irq:
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+ free_irq(ksproc->irq_ring, ksproc);
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+ flush_work(&ksproc->workqueue);
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+out:
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+ return ret;
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+}
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+
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+/*
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+ * Stop the DSP remote processor.
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+ *
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+ * This function puts the DSP processor into reset, and finishes processing
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+ * of any pending messages.
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+ */
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+static int keystone_rproc_stop(struct rproc *rproc)
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+{
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+ struct keystone_rproc *ksproc = rproc->priv;
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+
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+ keystone_rproc_dsp_reset(ksproc);
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+ free_irq(ksproc->irq_fault, ksproc);
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+ free_irq(ksproc->irq_ring, ksproc);
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+ flush_work(&ksproc->workqueue);
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+
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+ return 0;
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+}
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+
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+/*
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+ * Kick the remote processor to notify about pending unprocessed messages.
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+ * The vqid usage is not used and is inconsequential, as the kick is performed
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+ * through a simulated GPIO (a bit in an IPC interrupt-triggering register),
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+ * the remote processor is expected to process both its Tx and Rx virtqueues.
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+ */
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+static void keystone_rproc_kick(struct rproc *rproc, int vqid)
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+{
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+ struct keystone_rproc *ksproc = rproc->priv;
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+
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+ if (WARN_ON(ksproc->kick_gpio < 0))
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+ return;
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+
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+ gpio_set_value(ksproc->kick_gpio, 1);
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+}
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+
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+/*
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+ * Custom function to translate a DSP device address (internal RAMs only) to a
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+ * kernel virtual address. The DSPs can access their RAMs at either an internal
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+ * address visible only from a DSP, or at the SoC-level bus address. Both these
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+ * addresses need to be looked through for translation. The translated addresses
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+ * can be used either by the remoteproc core for loading (when using kernel
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+ * remoteproc loader), or by any rpmsg bus drivers.
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+ */
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+static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
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+{
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+ struct keystone_rproc *ksproc = rproc->priv;
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+ void __iomem *va = NULL;
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+ phys_addr_t bus_addr;
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+ u32 dev_addr, offset;
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+ size_t size;
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+ int i;
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+
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+ if (len <= 0)
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+ return NULL;
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+
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+ for (i = 0; i < ksproc->num_mems; i++) {
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+ bus_addr = ksproc->mem[i].bus_addr;
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+ dev_addr = ksproc->mem[i].dev_addr;
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+ size = ksproc->mem[i].size;
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+
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+ if (da < KEYSTONE_RPROC_LOCAL_ADDRESS_MASK) {
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+ /* handle DSP-view addresses */
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+ if ((da >= dev_addr) &&
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+ ((da + len) <= (dev_addr + size))) {
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+ offset = da - dev_addr;
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+ va = ksproc->mem[i].cpu_addr + offset;
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+ break;
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+ }
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+ } else {
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+ /* handle SoC-view addresses */
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+ if ((da >= bus_addr) &&
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+ (da + len) <= (bus_addr + size)) {
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+ offset = da - bus_addr;
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+ va = ksproc->mem[i].cpu_addr + offset;
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+ break;
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+ }
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+ }
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+ }
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+
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+ return (__force void *)va;
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+}
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+
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+static const struct rproc_ops keystone_rproc_ops = {
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+ .start = keystone_rproc_start,
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+ .stop = keystone_rproc_stop,
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+ .kick = keystone_rproc_kick,
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+ .da_to_va = keystone_rproc_da_to_va,
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+};
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+
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+static int keystone_rproc_of_get_memories(struct platform_device *pdev,
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+ struct keystone_rproc *ksproc)
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+{
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+ static const char * const mem_names[] = {"l2sram", "l1pram", "l1dram"};
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+ struct device *dev = &pdev->dev;
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+ struct resource *res;
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+ int num_mems = 0;
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+ int i;
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+
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+ num_mems = ARRAY_SIZE(mem_names);
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+ ksproc->mem = devm_kcalloc(ksproc->dev, num_mems,
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+ sizeof(*ksproc->mem), GFP_KERNEL);
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+ if (!ksproc->mem)
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+ return -ENOMEM;
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+
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+ for (i = 0; i < num_mems; i++) {
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+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
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+ mem_names[i]);
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+ ksproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
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+ if (IS_ERR(ksproc->mem[i].cpu_addr)) {
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+ dev_err(dev, "failed to parse and map %s memory\n",
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+ mem_names[i]);
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+ return PTR_ERR(ksproc->mem[i].cpu_addr);
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+ }
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+ ksproc->mem[i].bus_addr = res->start;
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+ ksproc->mem[i].dev_addr =
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+ res->start & KEYSTONE_RPROC_LOCAL_ADDRESS_MASK;
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+ ksproc->mem[i].size = resource_size(res);
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+
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+ /* zero out memories to start in a pristine state */
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+ memset((__force void *)ksproc->mem[i].cpu_addr, 0,
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+ ksproc->mem[i].size);
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+ }
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+ ksproc->num_mems = num_mems;
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+
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+ return 0;
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+}
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+
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+static int keystone_rproc_of_get_dev_syscon(struct platform_device *pdev,
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+ struct keystone_rproc *ksproc)
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+{
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+ struct device_node *np = pdev->dev.of_node;
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+ struct device *dev = &pdev->dev;
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+ int ret;
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+
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+ if (!of_property_read_bool(np, "ti,syscon-dev")) {
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+ dev_err(dev, "ti,syscon-dev property is absent\n");
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+ return -EINVAL;
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+ }
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+
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+ ksproc->dev_ctrl =
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+ syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev");
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+ if (IS_ERR(ksproc->dev_ctrl)) {
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+ ret = PTR_ERR(ksproc->dev_ctrl);
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+ return ret;
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+ }
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+
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+ if (of_property_read_u32_index(np, "ti,syscon-dev", 1,
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+ &ksproc->boot_offset)) {
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+ dev_err(dev, "couldn't read the boot register offset\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int keystone_rproc_probe(struct platform_device *pdev)
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+{
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+ struct device *dev = &pdev->dev;
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+ struct device_node *np = dev->of_node;
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+ struct keystone_rproc *ksproc;
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+ struct rproc *rproc;
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+ int dsp_id;
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+ char *fw_name = NULL;
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+ char *template = "keystone-dsp%d-fw";
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+ int name_len = 0;
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+ int ret = 0;
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+
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+ if (!np) {
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+ dev_err(dev, "only DT-based devices are supported\n");
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+ return -ENODEV;
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+ }
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+
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+ dsp_id = of_alias_get_id(np, "rproc");
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+ if (dsp_id < 0) {
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+ dev_warn(dev, "device does not have an alias id\n");
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+ return dsp_id;
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+ }
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+
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+ /* construct a custom default fw name - subject to change in future */
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+ name_len = strlen(template); /* assuming a single digit alias */
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+ fw_name = devm_kzalloc(dev, name_len, GFP_KERNEL);
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+ if (!fw_name)
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+ return -ENOMEM;
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+ snprintf(fw_name, name_len, template, dsp_id);
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+
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+ rproc = rproc_alloc(dev, dev_name(dev), &keystone_rproc_ops, fw_name,
|
|
|
+ sizeof(*ksproc));
|
|
|
+ if (!rproc)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ rproc->has_iommu = false;
|
|
|
+ ksproc = rproc->priv;
|
|
|
+ ksproc->rproc = rproc;
|
|
|
+ ksproc->dev = dev;
|
|
|
+
|
|
|
+ ret = keystone_rproc_of_get_dev_syscon(pdev, ksproc);
|
|
|
+ if (ret)
|
|
|
+ goto free_rproc;
|
|
|
+
|
|
|
+ ksproc->reset = devm_reset_control_get(dev, NULL);
|
|
|
+ if (IS_ERR(ksproc->reset)) {
|
|
|
+ ret = PTR_ERR(ksproc->reset);
|
|
|
+ goto free_rproc;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* enable clock for accessing DSP internal memories */
|
|
|
+ pm_runtime_enable(dev);
|
|
|
+ ret = pm_runtime_get_sync(dev);
|
|
|
+ if (ret < 0) {
|
|
|
+ dev_err(dev, "failed to enable clock, status = %d\n", ret);
|
|
|
+ pm_runtime_put_noidle(dev);
|
|
|
+ goto disable_rpm;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = keystone_rproc_of_get_memories(pdev, ksproc);
|
|
|
+ if (ret)
|
|
|
+ goto disable_clk;
|
|
|
+
|
|
|
+ ksproc->irq_ring = platform_get_irq_byname(pdev, "vring");
|
|
|
+ if (ksproc->irq_ring < 0) {
|
|
|
+ ret = ksproc->irq_ring;
|
|
|
+ dev_err(dev, "failed to get vring interrupt, status = %d\n",
|
|
|
+ ret);
|
|
|
+ goto disable_clk;
|
|
|
+ }
|
|
|
+
|
|
|
+ ksproc->irq_fault = platform_get_irq_byname(pdev, "exception");
|
|
|
+ if (ksproc->irq_fault < 0) {
|
|
|
+ ret = ksproc->irq_fault;
|
|
|
+ dev_err(dev, "failed to get exception interrupt, status = %d\n",
|
|
|
+ ret);
|
|
|
+ goto disable_clk;
|
|
|
+ }
|
|
|
+
|
|
|
+ ksproc->kick_gpio = of_get_named_gpio_flags(np, "kick-gpios", 0, NULL);
|
|
|
+ if (ksproc->kick_gpio < 0) {
|
|
|
+ ret = ksproc->kick_gpio;
|
|
|
+ dev_err(dev, "failed to get gpio for virtio kicks, status = %d\n",
|
|
|
+ ret);
|
|
|
+ goto disable_clk;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (of_reserved_mem_device_init(dev))
|
|
|
+ dev_warn(dev, "device does not have specific CMA pool\n");
|
|
|
+
|
|
|
+ /* ensure the DSP is in reset before loading firmware */
|
|
|
+ ret = reset_control_status(ksproc->reset);
|
|
|
+ if (ret < 0) {
|
|
|
+ dev_err(dev, "failed to get reset status, status = %d\n", ret);
|
|
|
+ goto release_mem;
|
|
|
+ } else if (ret == 0) {
|
|
|
+ WARN(1, "device is not in reset\n");
|
|
|
+ keystone_rproc_dsp_reset(ksproc);
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = rproc_add(rproc);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "failed to add register device with remoteproc core, status = %d\n",
|
|
|
+ ret);
|
|
|
+ goto release_mem;
|
|
|
+ }
|
|
|
+
|
|
|
+ platform_set_drvdata(pdev, ksproc);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+release_mem:
|
|
|
+ of_reserved_mem_device_release(dev);
|
|
|
+disable_clk:
|
|
|
+ pm_runtime_put_sync(dev);
|
|
|
+disable_rpm:
|
|
|
+ pm_runtime_disable(dev);
|
|
|
+free_rproc:
|
|
|
+ rproc_free(rproc);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static int keystone_rproc_remove(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct keystone_rproc *ksproc = platform_get_drvdata(pdev);
|
|
|
+
|
|
|
+ rproc_del(ksproc->rproc);
|
|
|
+ pm_runtime_put_sync(&pdev->dev);
|
|
|
+ pm_runtime_disable(&pdev->dev);
|
|
|
+ rproc_free(ksproc->rproc);
|
|
|
+ of_reserved_mem_device_release(&pdev->dev);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct of_device_id keystone_rproc_of_match[] = {
|
|
|
+ { .compatible = "ti,k2hk-dsp", },
|
|
|
+ { .compatible = "ti,k2l-dsp", },
|
|
|
+ { .compatible = "ti,k2e-dsp", },
|
|
|
+ { /* sentinel */ },
|
|
|
+};
|
|
|
+MODULE_DEVICE_TABLE(of, keystone_rproc_of_match);
|
|
|
+
|
|
|
+static struct platform_driver keystone_rproc_driver = {
|
|
|
+ .probe = keystone_rproc_probe,
|
|
|
+ .remove = keystone_rproc_remove,
|
|
|
+ .driver = {
|
|
|
+ .name = "keystone-rproc",
|
|
|
+ .of_match_table = keystone_rproc_of_match,
|
|
|
+ },
|
|
|
+};
|
|
|
+
|
|
|
+module_platform_driver(keystone_rproc_driver);
|
|
|
+
|
|
|
+MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
|
|
|
+MODULE_LICENSE("GPL v2");
|
|
|
+MODULE_DESCRIPTION("TI Keystone DSP Remoteproc driver");
|
Linus Torvalds