Adding a remoteproc driver implementation for OMAP-L138 DSP
Signed-off-by: Robert Tivy <rt...@ti.com>
---
drivers/remoteproc/Kconfig | 23 ++
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/davinci_remoteproc.c | 307 ++++++++++++++++++++++++
include/linux/platform_data/da8xx-remoteproc.h | 33 +++
4 files changed, 364 insertions(+)
create mode 100644 drivers/remoteproc/davinci_remoteproc.c
create mode 100644 include/linux/platform_data/da8xx-remoteproc.h
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 96ce101..7d3a5e0 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -41,4 +41,27 @@ config STE_MODEM_RPROC
This can be either built-in or a loadable module.
If unsure say N.
+config DAVINCI_REMOTEPROC
+ tristate "DaVinci DA850/OMAPL138 remoteproc support (EXPERIMENTAL)"
+ depends on ARCH_DAVINCI_DA850
+ select REMOTEPROC
+ select RPMSG
+ select FW_LOADER
+ select CMA
+ default n
+ help
+ Say y here to support DaVinci DA850/OMAPL138 remote processors
+ via the remote processor framework.
+
+ You want to say y here in order to enable AMP
+ use-cases to run on your platform (multimedia codecs are
+ offloaded to remote DSP processors using this framework).
+
+ It's safe to say n here if you're not interested in multimedia
+ offloading or just want a bare minimum kernel.
+
+ This feature is considered EXPERIMENTAL, due to it not having
+ any previous exposure to the general public and therefore
+ limited developer-based testing.
+
endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 391b651..da2dc0a 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -9,3 +9,4 @@ remoteproc-y += remoteproc_virtio.o
remoteproc-y += remoteproc_elf_loader.o
obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
obj-$(CONFIG_STE_MODEM_RPROC) += ste_modem_rproc.o
+obj-$(CONFIG_DAVINCI_REMOTEPROC) += davinci_remoteproc.o
diff --git a/drivers/remoteproc/davinci_remoteproc.c
b/drivers/remoteproc/davinci_remoteproc.c
new file mode 100644
index 0000000..fc6fd72
--- /dev/null
+++ b/drivers/remoteproc/davinci_remoteproc.c
@@ -0,0 +1,307 @@
+/*
+ * Remote processor machine-specific module for Davinci
+ *
+ * Copyright (C) 2011-2012 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/printk.h>
+#include <linux/bitops.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/platform_data/da8xx-remoteproc.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <mach/clock.h> /* for davinci_clk_reset_assert/deassert() */
+
+#include "remoteproc_internal.h"
+
+static char *fw_name;
+module_param(fw_name, charp, S_IRUGO);
+MODULE_PARM_DESC(fw_name, "\n\t\tName of DSP firmware file in /lib/firmware");
+
+/*
+ * OMAP-L138 Technical References:
+ * http://www.ti.com/product/omap-l138
+ */
+#define SYSCFG_CHIPSIG_OFFSET 0x174
+#define SYSCFG_CHIPSIG_CLR_OFFSET 0x178
+#define SYSCFG_CHIPINT0 (1 << 0)
+#define SYSCFG_CHIPINT1 (1 << 1)
+#define SYSCFG_CHIPINT2 (1 << 2)
+#define SYSCFG_CHIPINT3 (1 << 3)
+
+/**
+ * struct davinci_rproc - davinci remote processor state
+ * @rproc: rproc handle
+ */
+struct davinci_rproc {
+ struct rproc *rproc;
+ struct clk *dsp_clk;
+};
+
+static void __iomem *syscfg0_base;
+static struct platform_device *remoteprocdev;
+static struct irq_data *irq_data;
+static void (*ack_fxn)(struct irq_data *data);
+static int irq;
+
+/**
+ * handle_event() - inbound virtqueue message workqueue function
+ *
+ * This funciton is registered as a kernel thread and is scheduled by the
+ * kernel handler.
+ */
+static irqreturn_t handle_event(int irq, void *p)
+{
+ struct rproc *rproc = platform_get_drvdata(remoteprocdev);
+
+ /* Process incoming buffers on our vring */
+ while (IRQ_HANDLED == rproc_vq_interrupt(rproc, 0))
+ ;
+
+ /* Must allow wakeup of potenitally blocking senders: */
+ rproc_vq_interrupt(rproc, 1);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * davinci_rproc_callback() - inbound virtqueue message handler
+ *
+ * This handler is invoked directly by the kernel whenever the remote
+ * core (DSP) has modified the state of a virtqueue. There is no
+ * "payload" message indicating the virtqueue index as is the case with
+ * mailbox-based implementations on OMAP4. As such, this handler "polls"
+ * each known virtqueue index for every invocation.
+ */
+static irqreturn_t davinci_rproc_callback(int irq, void *p)
+{
+ if (readl(syscfg0_base + SYSCFG_CHIPSIG_OFFSET) & SYSCFG_CHIPINT0) {
+ /* Clear interrupt level source */
+ writel(SYSCFG_CHIPINT0,
+ syscfg0_base + SYSCFG_CHIPSIG_CLR_OFFSET);
+
+ /*
+ * ACK intr to AINTC.
+ *
+ * It has already been ack'ed by the kernel before calling
+ * this function, but since the ARM<->DSP interrupts in the
+ * CHIPSIG register are "level" instead of "pulse" variety,
+ * we need to ack it after taking down the level else we'll
+ * be called again immediately after returning.
+ */
+ ack_fxn(irq_data);
+
+ return IRQ_WAKE_THREAD;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int davinci_rproc_start(struct rproc *rproc)
+{
+ struct platform_device *pdev = to_platform_device(rproc->dev.parent);
+ struct device *dev = rproc->dev.parent;
+ struct davinci_rproc *drproc = rproc->priv;
+ struct clk *dsp_clk;
+ struct resource *r;
+ unsigned long host1cfg_physaddr;
+ unsigned int host1cfg_offset;
+ int ret;
+
+ remoteprocdev = pdev;
+
+ /* hw requires the start (boot) address be on 1KB boundary */
+ if (rproc->bootaddr & 0x3ff) {
+ dev_err(dev, "invalid boot address: must be aligned to 1KB\n");
+
+ return -EINVAL;
+ }
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (IS_ERR_OR_NULL(r)) {
+ dev_err(dev, "platform_get_resource() error: %ld\n",
+ PTR_ERR(r));
+
+ return PTR_ERR(r);
+ }
+ host1cfg_physaddr = (unsigned long)r->start;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "platform_get_irq(pdev, 0) error: %d\n", irq);
+
+ return irq;
+ }
+
+ irq_data = irq_get_irq_data(irq);
+ if (IS_ERR_OR_NULL(irq_data)) {
+ dev_err(dev, "irq_get_irq_data(%d) error: %ld\n",
+ irq, PTR_ERR(irq_data));
+
+ return PTR_ERR(irq_data);
+ }
+ ack_fxn = irq_data->chip->irq_ack;
+
+ ret = request_threaded_irq(irq, davinci_rproc_callback, handle_event,
+ 0, "davinci-remoteproc", drproc);
+ if (ret) {
+ dev_err(dev, "request_threaded_irq error: %d\n", ret);
+
+ return ret;
+ }
+
+ syscfg0_base = ioremap(host1cfg_physaddr & PAGE_MASK, SZ_4K);
+ host1cfg_offset = offset_in_page(host1cfg_physaddr);
+ writel(rproc->bootaddr, syscfg0_base + host1cfg_offset);
+
+ dsp_clk = clk_get(dev, NULL);
+ if (IS_ERR_OR_NULL(dsp_clk)) {
+ dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));
+ ret = PTR_ERR(dsp_clk);
+ goto fail;
+ }
+ clk_enable(dsp_clk);
+ davinci_clk_reset_deassert(dsp_clk);
+
+ drproc->dsp_clk = dsp_clk;
+
+ return 0;
+fail:
+ free_irq(irq, drproc);
+ iounmap(syscfg0_base);
+
+ return ret;
+}
+
+static int davinci_rproc_stop(struct rproc *rproc)
+{
+ struct davinci_rproc *drproc = rproc->priv;
+ struct clk *dsp_clk = drproc->dsp_clk;
+
+ clk_disable(dsp_clk);
+ clk_put(dsp_clk);
+ iounmap(syscfg0_base);
+ free_irq(irq, drproc);
+
+ return 0;
+}
+
+/* kick a virtqueue */
+static void davinci_rproc_kick(struct rproc *rproc, int vqid)
+{
+ int timed_out;
+ unsigned long timeout;
+
+ timed_out = 0;
+ timeout = jiffies + HZ/100;
+
+ /* Poll for ack from other side first */
+ while (readl(syscfg0_base + SYSCFG_CHIPSIG_OFFSET) &
+ SYSCFG_CHIPINT2)
+ if (time_after(jiffies, timeout)) {
+ dev_err(rproc->dev.parent, "failed to receive ack\n");
+ timed_out = 1;
+
+ break;
+ }
+
+ if (!timed_out)
+ /* Interupt remote proc */
+ writel(SYSCFG_CHIPINT2, syscfg0_base + SYSCFG_CHIPSIG_OFFSET);
+}
+
+static struct rproc_ops davinci_rproc_ops = {
+ .start = davinci_rproc_start,
+ .stop = davinci_rproc_stop,
+ .kick = davinci_rproc_kick,
+};
+
+static int davinci_rproc_probe(struct platform_device *pdev)
+{
+ struct da8xx_rproc_pdata *pdata = pdev->dev.platform_data;
+ struct davinci_rproc *drproc;
+ struct rproc *rproc;
+ struct clk *dsp_clk;
+ int ret;
+
+ if (!fw_name) {
+ dev_err(&pdev->dev, "No firmware file specified\n");
+
+ return -EINVAL;
+ }
+
+ dev_dbg(&pdev->dev, "module param fw_name: '%s'\n", fw_name);
+ pdata->firmware = fw_name;
+
+ rproc = rproc_alloc(&pdev->dev, pdata->name, &davinci_rproc_ops,
+ pdata->firmware, sizeof(*drproc));
+ if (!rproc)
+ return -ENOMEM;
+
+ drproc = rproc->priv;
+ drproc->rproc = rproc;
+
+ platform_set_drvdata(pdev, rproc);
+
+ ret = rproc_add(rproc);
+ if (ret)
+ goto free_rproc;
+
+ /*
+ * rproc_add() can end up enabling the DSP's clk with the DSP
+ * *not* in reset, but davinci_rproc_start() needs the DSP to be
+ * held in reset at the time it is called.
+ */
+ dsp_clk = clk_get(rproc->dev.parent, NULL);
+ davinci_clk_reset_assert(dsp_clk);
+ clk_put(dsp_clk);
+
+ return 0;
+
+free_rproc:
+ dev_err(rproc->dev.parent, "rproc_add failed: %d\n", ret);
+ rproc_put(rproc);
+
+ return ret;
+}
+
+static int __devexit davinci_rproc_remove(struct platform_device *pdev)
+{
+ struct rproc *rproc = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = rproc_del(rproc);
+ if (ret)
+ return ret;
+
+ rproc_put(rproc);
+
+ return 0;
+}
+
+static struct platform_driver davinci_rproc_driver = {
+ .probe = davinci_rproc_probe,
+ .remove = __devexit_p(davinci_rproc_remove),
+ .driver = {
+ .name = "davinci-rproc",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(davinci_rproc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Davinci DA850 Remote Processor control driver");
diff --git a/include/linux/platform_data/da8xx-remoteproc.h
b/include/linux/platform_data/da8xx-remoteproc.h
new file mode 100644
index 0000000..50e8c55
--- /dev/null
+++ b/include/linux/platform_data/da8xx-remoteproc.h
@@ -0,0 +1,33 @@
+/*
+ * Remote Processor
+ *
+ * Copyright (C) 2011-2012 Texas Instruments, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __DA8XX_REMOTEPROC_H__
+#define __DA8XX_REMOTEPROC_H__
+
+#include <linux/remoteproc.h>
+
+/**
+ * struct da8xx_rproc_pdata - da8xx remoteproc's platform data
+ * @name: the remoteproc's name
+ * @firmware: name of firmware file to load
+ * @ops: start/stop rproc handlers
+ */
+struct da8xx_rproc_pdata {
+ const char *name;
+ const char *firmware;
+ const struct rproc_ops *ops;
+};
+
+#endif /* __DA8XX_REMOTEPROC_H__ */
--
1.7.9.4
_______________________________________________
Davinci-linux-open-source mailing list
Davinci-linux-open-source@linux.davincidsp.com
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
