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    Subject[RFC 5/8] remoteproc: add davinci implementation
    Date
    From: Mark Grosen <mgrosen@ti.com>

    Add remoteproc implementation for da850, so we can boot its DSP.

    Signed-off-by: Mark Grosen <mgrosen@ti.com>
    Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
    ---
    arch/arm/mach-davinci/include/mach/remoteproc.h | 28 +++++
    drivers/remoteproc/Kconfig | 16 +++
    drivers/remoteproc/Makefile | 1 +
    drivers/remoteproc/davinci_remoteproc.c | 147 +++++++++++++++++++++++
    4 files changed, 192 insertions(+), 0 deletions(-)
    create mode 100644 arch/arm/mach-davinci/include/mach/remoteproc.h
    create mode 100644 drivers/remoteproc/davinci_remoteproc.c

    diff --git a/arch/arm/mach-davinci/include/mach/remoteproc.h b/arch/arm/mach-davinci/include/mach/remoteproc.h
    new file mode 100644
    index 0000000..af6e88c
    --- /dev/null
    +++ b/arch/arm/mach-davinci/include/mach/remoteproc.h
    @@ -0,0 +1,28 @@
    +/*
    + * Remote Processor
    + *
    + * Copyright (C) 2011 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 _DAVINCI_REMOTEPROC_H
    +#define _DAVINCI_REMOTEPROC_H
    +
    +#include <linux/remoteproc.h>
    +
    +struct davinci_rproc_pdata {
    + struct rproc_ops *ops;
    + char *name;
    + char *clk_name;
    + char *firmware;
    +};
    +
    +#endif /* _DAVINCI_REMOTEPROC_H */
    diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
    index 88421bd..1e594b5 100644
    --- a/drivers/remoteproc/Kconfig
    +++ b/drivers/remoteproc/Kconfig
    @@ -26,3 +26,19 @@ config OMAP_REMOTE_PROC

    It's safe to say n here if you're not interested in multimedia
    offloading or just want a bare minimum kernel.
    +
    +config DAVINCI_REMOTE_PROC
    + tristate "Davinci remoteproc support"
    + depends on ARCH_DAVINCI_DA850
    + select REMOTE_PROC
    + default y
    + help
    + Say y here to support Davinci's DSP remote processor via the remote
    + processor framework (currently only da850 is supported).
    +
    + Usually you want to say y here, in order to enable multimedia
    + 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.
    diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
    index 0198b1d..e83dac9 100644
    --- a/drivers/remoteproc/Makefile
    +++ b/drivers/remoteproc/Makefile
    @@ -4,3 +4,4 @@

    obj-$(CONFIG_REMOTE_PROC) += remoteproc.o
    obj-$(CONFIG_OMAP_REMOTE_PROC) += omap_remoteproc.o
    +obj-$(CONFIG_DAVINCI_REMOTE_PROC) += davinci_remoteproc.o
    diff --git a/drivers/remoteproc/davinci_remoteproc.c b/drivers/remoteproc/davinci_remoteproc.c
    new file mode 100644
    index 0000000..0e26fe9
    --- /dev/null
    +++ b/drivers/remoteproc/davinci_remoteproc.c
    @@ -0,0 +1,147 @@
    +/*
    + * Remote processor machine-specific module for Davinci
    + *
    + * Copyright (C) 2011 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.
    + */
    +
    +#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/clk.h>
    +#include <linux/io.h>
    +
    +#include <mach/da8xx.h>
    +#include <mach/cputype.h>
    +#include <mach/psc.h>
    +#include <mach/remoteproc.h>
    +
    +/*
    + * Technical Reference:
    + * OMAP-L138 Applications Processor System Reference Guide
    + * http://www.ti.com/litv/pdf/sprugm7d
    + */
    +
    +/* local reset bit (0 is asserted) in MDCTL15 register (section 9.6.18) */
    +#define LRST BIT(8)
    +
    +/* next state bits in MDCTL15 register (section 9.6.18) */
    +#define NEXT_ENABLED 0x3
    +
    +/* register for DSP boot address in SYSCFG0 module (section 11.5.6) */
    +#define HOST1CFG 0x44
    +
    +static inline int davinci_rproc_start(struct rproc *rproc, u64 bootaddr)
    +{
    + struct device *dev = rproc->dev;
    + struct davinci_rproc_pdata *pdata = dev->platform_data;
    + struct davinci_soc_info *soc_info = &davinci_soc_info;
    + void __iomem *psc_base;
    + struct clk *dsp_clk;
    +
    + /* hw requires the start (boot) address be on 1KB boundary */
    + if (bootaddr & 0x3ff) {
    + dev_err(dev, "invalid boot address: must be aligned to 1KB\n");
    + return -EINVAL;
    + }
    +
    + dsp_clk = clk_get(dev, pdata->clk_name);
    + if (IS_ERR_OR_NULL(dsp_clk)) {
    + dev_err(dev, "clk_get error: %ld\n", PTR_ERR(dsp_clk));
    + return PTR_ERR(dsp_clk);
    + }
    +
    + clk_enable(dsp_clk);
    + rproc->priv = dsp_clk;
    +
    + psc_base = ioremap(soc_info->psc_bases[0], SZ_4K);
    +
    + /* insure local reset is asserted before writing start address */
    + __raw_writel(NEXT_ENABLED, psc_base + MDCTL + 4 * DA8XX_LPSC0_GEM);
    +
    + __raw_writel(bootaddr, DA8XX_SYSCFG0_VIRT(HOST1CFG));
    +
    + /* de-assert local reset to start the dsp running */
    + __raw_writel(LRST | NEXT_ENABLED, psc_base + MDCTL +
    + 4 * DA8XX_LPSC0_GEM);
    +
    + iounmap(psc_base);
    +
    + return 0;
    +}
    +
    +static inline int davinci_rproc_stop(struct rproc *rproc)
    +{
    + struct davinci_soc_info *soc_info = &davinci_soc_info;
    + void __iomem *psc_base;
    + struct clk *dsp_clk = rproc->priv;
    +
    + psc_base = ioremap(soc_info->psc_bases[0], SZ_4K);
    +
    + /* halt the dsp by asserting local reset */
    + __raw_writel(NEXT_ENABLED, psc_base + MDCTL + 4 * DA8XX_LPSC0_GEM);
    +
    + clk_disable(dsp_clk);
    + clk_put(dsp_clk);
    +
    + iounmap(psc_base);
    +
    + return 0;
    +}
    +
    +static struct rproc_ops davinci_rproc_ops = {
    + .start = davinci_rproc_start,
    + .stop = davinci_rproc_stop,
    +};
    +
    +static int davinci_rproc_probe(struct platform_device *pdev)
    +{
    + struct davinci_rproc_pdata *pdata = pdev->dev.platform_data;
    +
    + return rproc_register(&pdev->dev, pdata->name, &davinci_rproc_ops,
    + pdata->firmware, NULL, THIS_MODULE);
    +}
    +
    +static int __devexit davinci_rproc_remove(struct platform_device *pdev)
    +{
    + struct davinci_rproc_pdata *pdata = pdev->dev.platform_data;
    +
    + return rproc_unregister(pdata->name);
    +}
    +
    +static struct platform_driver davinci_rproc_driver = {
    + .probe = davinci_rproc_probe,
    + .remove = __devexit_p(davinci_rproc_remove),
    + .driver = {
    + .name = "davinci-rproc",
    + .owner = THIS_MODULE,
    + },
    +};
    +
    +static int __init davinci_rproc_init(void)
    +{
    + return platform_driver_register(&davinci_rproc_driver);
    +}
    +module_init(davinci_rproc_init);
    +
    +static void __exit davinci_rproc_exit(void)
    +{
    + platform_driver_unregister(&davinci_rproc_driver);
    +}
    +module_exit(davinci_rproc_exit);
    +
    +MODULE_LICENSE("GPL v2");
    +MODULE_DESCRIPTION("Davinci Remote Processor control driver");
    --
    1.7.1


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