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SubjectRe: [PATCH v3 3/6] remoteproc: Supply controller driver for ST's Remote Processors
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Hi Lee,

On 09/02/2015 10:38 AM, Lee Jones wrote:
> Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
> drivers/remoteproc/Kconfig | 9 ++
> drivers/remoteproc/Makefile | 1 +
> drivers/remoteproc/st_remoteproc.c | 307 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 317 insertions(+)
> create mode 100644 drivers/remoteproc/st_remoteproc.c
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 28c711f..72e97d7 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -77,4 +77,13 @@ config DA8XX_REMOTEPROC
> It's safe to say n here if you're not interested in multimedia
> offloading.
>
> +config ST_REMOTEPROC
> + tristate "ST remoteproc support"
> + depends on ARCH_STI
> + select REMOTEPROC
> + help
> + Say y here to support ST's adjunct processors via the remote
> + processor framework.
> + This can be either built-in or a loadable module.
> +
> endmenu
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 81b04d1..279cb2e 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
> obj-$(CONFIG_STE_MODEM_RPROC) += ste_modem_rproc.o
> obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
> obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
> +obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
> diff --git a/drivers/remoteproc/st_remoteproc.c b/drivers/remoteproc/st_remoteproc.c
> new file mode 100644
> index 0000000..24ae6d3
> --- /dev/null
> +++ b/drivers/remoteproc/st_remoteproc.c
> @@ -0,0 +1,307 @@
> +/*
> + * ST's Remote Processor Control Driver
> + *
> + * Copyright (C) 2015 STMicroelectronics - All Rights Reserved
> + *
> + * Author: Ludovic Barre <ludovic.barre@st.com>
> + *
> + * 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.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/remoteproc.h>
> +#include <linux/reset.h>
> +
> +struct st_rproc_config {
> + bool sw_reset;
> + bool pwr_reset;
> + u32 bootaddr_mask;
> +};
> +
> +struct st_rproc {
> + struct st_rproc_config *config;
> + struct reset_control *sw_reset;
> + struct reset_control *pwr_reset;
> + struct clk *clk;
> + u32 clk_rate;
> + struct regmap *boot_base;
> + u32 boot_offset;
> +};
> +
> +static int st_rproc_stop(struct rproc *rproc)
> +{
> + struct st_rproc *ddata = rproc->priv;
> + int sw_err = 0, pwr_err = 0;
> +
> + if (ddata->config->sw_reset) {
> + sw_err = reset_control_assert(ddata->sw_reset);
> + if (sw_err)
> + dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
> + }
> +
> + if (ddata->config->pwr_reset) {
> + pwr_err = reset_control_assert(ddata->pwr_reset);
> + if (pwr_err)
> + dev_err(&rproc->dev, "Failed to assert Power Reset\n");
> + }
> +
> + clk_disable(ddata->clk);
> +
> + return sw_err ?: pwr_err;
> +}

nit, can you please move st_rproc_stop function after st_rproc_start,
same order as in fw_ops, for better flow.

> +
> +static int st_rproc_start(struct rproc *rproc)
> +{
> + struct st_rproc *ddata = rproc->priv;
> + int err;
> +
> + regmap_update_bits(ddata->boot_base, ddata->boot_offset,
> + ddata->config->bootaddr_mask, rproc->bootaddr);
> +
> + err = clk_enable(ddata->clk);
> + if (err) {
> + dev_err(&rproc->dev, "Failed to enable clock\n");
> + return err;
> + }
> +
> + if (ddata->config->sw_reset) {
> + err = reset_control_deassert(ddata->sw_reset);
> + if (err) {
> + dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
> + goto sw_reset_fail;
> + }
> + }
> +
> + if (ddata->config->pwr_reset) {
> + err = reset_control_deassert(ddata->pwr_reset);
> + if (err) {
> + dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
> + goto pwr_reset_fail;
> + }
> + }
> +
> + dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);
> +
> + return 0;
> +
> +
> +pwr_reset_fail:
> + reset_control_assert(ddata->sw_reset);

Should this be under a check for (ddata->config->sw_reset). It is not
clear from code whether the sw_reset and pwr_reset are exclusive of each
of other or have both.

> +sw_reset_fail:
> + clk_disable(ddata->clk);
> +
> + return err;
> +}
> +
> +static struct rproc_ops st_rproc_ops = {
> + .start = st_rproc_start,
> + .stop = st_rproc_stop,
> +};
> +
> +/*
> + * Fetch state of the processor: 0 is off, 1 is on.
> + */
> +static int st_rproc_state(struct platform_device *pdev)
> +{
> + struct rproc *rproc = platform_get_drvdata(pdev);
> + struct st_rproc *ddata = rproc->priv;
> + int reset_sw = 0, reset_pwr = 0;
> +
> + if (ddata->config->sw_reset)
> + reset_sw = reset_control_status(ddata->sw_reset);
> +
> + if (ddata->config->pwr_reset)
> + reset_pwr = reset_control_status(ddata->pwr_reset);
> +
> + if (reset_sw < 0 || reset_pwr < 0)
> + return -EINVAL;
> +
> + return !reset_sw && !reset_pwr;
> +}
> +
> +static const struct st_rproc_config st40_rproc_cfg = {
> + .sw_reset = true,
> + .pwr_reset = true,
> + .bootaddr_mask = GENMASK(28, 1),
> +};
> +
> +static const struct st_rproc_config st231_rproc_cfg = {
> + .sw_reset = true,
> + .pwr_reset = false,
> + .bootaddr_mask = GENMASK(31, 6),
> +};
> +
> +static const struct of_device_id st_rproc_match[] = {
> + { .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
> + { .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, st_rproc_match);
> +
> +static int st_rproc_parse_dt(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct rproc *rproc = platform_get_drvdata(pdev);
> + struct st_rproc *ddata = rproc->priv;
> + struct device_node *np = dev->of_node;
> + struct resource *mem;
> + int err;
> +
> + if (ddata->config->sw_reset) {
> + ddata->sw_reset = devm_reset_control_get(dev, "sw_reset");
> + if (IS_ERR(ddata->sw_reset)) {
> + dev_err(dev, "Failed to get S/W Reset\n");
> + return PTR_ERR(ddata->sw_reset);
> + }
> + }
> +
> + if (ddata->config->pwr_reset) {
> + ddata->pwr_reset = devm_reset_control_get(dev, "pwr_reset");
> + if (IS_ERR(ddata->pwr_reset)) {
> + dev_err(dev, "Failed to get Power Reset\n");
> + return PTR_ERR(ddata->pwr_reset);
> + }
> + }
> +
> + ddata->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(ddata->clk)) {
> + dev_err(dev, "Failed to get clock\n");
> + return PTR_ERR(ddata->clk);
> + }
> +
> + err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
> + if (err) {
> + dev_err(dev, "failed to get clock frequency\n");
> + return err;
> + }
> +
> + ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
> + if (!ddata->boot_base) {
> + dev_err(dev, "Boot base not found\n");
> + return -EINVAL;
> + }
> +
> + err = of_property_read_u32_index(np, "st,syscfg", 1,
> + &ddata->boot_offset);
> + if (err) {
> + dev_err(dev, "Boot offset not found\n");
> + return -EINVAL;
> + }
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!mem) {
> + dev_err(dev, "no rproc memory definition\n");
> + return -ENXIO;
> + }
> +
> + if (!devm_request_mem_region(dev, mem->start,
> + resource_size(mem), pdev->name)) {
> + dev_err(dev, "failed to get memory region resource\n");
> + return -EBUSY;
> + }
> + err = dmam_declare_coherent_memory(dev, mem->start, mem->start,
> + resource_size(mem),
> + DMA_MEMORY_MAP |
> + DMA_MEMORY_EXCLUSIVE);
> + if (err < 0) {
> + dev_err(dev, "cannot declare coherent memory: %d\n", err);
> + return -ENXIO;
> + }

What kind of memory will this be? If this a carveout memory being
set-aside from DDR, you may want to use a reserved-memory node entry,
with a "memory-region" property added to the rproc device node and use
of_reserved_mem_device_init() and of_reserved_mem_device_release() API,
following the standard semantics of reserved-memory as in
Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt.

Obviously that will need a change in the binding as well.

> +
> + err = clk_prepare(ddata->clk);
> + if (err)
> + dev_err(dev, "failed to get clock\n");
> +
> + return err;
> +}
> +
> +static int st_rproc_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + const struct of_device_id *match;
> + struct st_rproc *ddata;
> + struct device_node *np = dev->of_node;
> + struct rproc *rproc;
> + int enabled;
> + int ret;
> +
> + match = of_match_device((st_rproc_match), dev);
> + if (!match || !match->data) {
> + dev_err(dev, "No device match found\n");
> + return -ENODEV;
> + }
> +
> + rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
> + if (!rproc)
> + return -ENOMEM;
> +
> + ddata = rproc->priv;
> + ddata->config = (struct st_rproc_config *)match->data;

I believe Ohad's preference is to explicitly set rproc->has_iommu to false.

> +
> + platform_set_drvdata(pdev, rproc);
> +
> + ret = st_rproc_parse_dt(pdev);
> + if (ret)
> + goto free_rproc;
> +
> + enabled = st_rproc_state(pdev);
> + if (enabled < 0)
> + goto free_rproc;
> +
> + if (enabled) {
> + atomic_inc(&rproc->power);
> + rproc->state = RPROC_RUNNING;

I am curious about this change, who are you expecting to have booted the
processor before the driver is probed?

> + } else {
> + clk_set_rate(ddata->clk, ddata->clk_rate);
> + }
> +
> + ret = rproc_add(rproc);
> + if (ret)
> + goto free_rproc;
> +
> + return 0;
> +
> +free_rproc:
> + rproc_put(rproc);
> + return ret;
> +}
> +
> +static int st_rproc_remove(struct platform_device *pdev)
> +{
> + struct rproc *rproc = platform_get_drvdata(pdev);
> + struct st_rproc *ddata = rproc->priv;
> +
> + rproc_del(rproc);
> +
> + clk_disable_unprepare(ddata->clk);
> +
> + rproc_put(rproc);
> +
> + return 0;
> +}
> +
> +static struct platform_driver st_rproc_driver = {
> + .probe = st_rproc_probe,
> + .remove = st_rproc_remove,
> + .driver = {
> + .name = "st-rproc",
> + .of_match_table = of_match_ptr(st_rproc_match),
> + },
> +};
> +module_platform_driver(st_rproc_driver);
> +
> +MODULE_DESCRIPTION("ST Remote Processor Control Driver");
> +MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
> +MODULE_LICENSE("GPL v2");
>



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