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SubjectRe: [PATCH V6 3/4] soc: imx: Add generic blk-ctl driver
On Sat, May 22, 2021 at 09:42:48PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> The i.MX8MM introduces an IP named BLK_CTL and usually is comprised of
> some GPRs.
>
> The GPRs has some clock bits and reset bits, but here we take it
> as virtual PDs, because of the clock and power domain A/B lock issue
> when taking it as a clock controller.
>
> For some bits, it might be good to also make it as a reset controller,
> but to i.MX8MM, we not add that support for now.
>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>

I would like to see some Reviewed-by tags.

> ---
> drivers/soc/imx/Makefile | 2 +-
> drivers/soc/imx/blk-ctl.c | 334 ++++++++++++++++++++++++++++++++++++++
> drivers/soc/imx/blk-ctl.h | 85 ++++++++++
> 3 files changed, 420 insertions(+), 1 deletion(-)
> create mode 100644 drivers/soc/imx/blk-ctl.c
> create mode 100644 drivers/soc/imx/blk-ctl.h
>
> diff --git a/drivers/soc/imx/Makefile b/drivers/soc/imx/Makefile
> index 078dc918f4f3..d3d2b49a386c 100644
> --- a/drivers/soc/imx/Makefile
> +++ b/drivers/soc/imx/Makefile
> @@ -4,4 +4,4 @@ obj-$(CONFIG_ARCH_MXC) += soc-imx.o
> endif
> obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
> obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
> -obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
> +obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o blk-ctl.o

As it's a generic blk-ctl driver, should we have a dedicated Kconfig
option for it?

> diff --git a/drivers/soc/imx/blk-ctl.c b/drivers/soc/imx/blk-ctl.c
> new file mode 100644
> index 000000000000..8e286b8ef1b3
> --- /dev/null
> +++ b/drivers/soc/imx/blk-ctl.c
> @@ -0,0 +1,334 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2021 NXP.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/types.h>
> +#include <linux/pm_domain.h>
> +#include <linux/reset-controller.h>

Some of the includes are out of alphabetic order. Also please check if
you need all of these headers.

> +
> +#include "blk-ctl.h"
> +
> +static inline struct imx_blk_ctl_domain *to_imx_blk_ctl_pd(struct generic_pm_domain *genpd)

Did you run checkpatch on it? Isn't this line beyond 80 column?

> +{
> + return container_of(genpd, struct imx_blk_ctl_domain, genpd);
> +}
> +
> +static int imx_blk_ctl_enable_hsk(struct device *dev)
> +{
> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev);
> + const struct imx_blk_ctl_hw *hw = blk_ctl->dev_data->hw_hsk;
> + struct regmap *regmap = blk_ctl->regmap;
> + int ret;
> +
> + if (hw->flags & IMX_BLK_CTL_PD_RESET) {
> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, hw->rst_mask);
> + if (ret)
> + return ret;
> + }
> +
> + ret = regmap_update_bits(regmap, hw->offset, hw->mask, hw->mask);
> +
> + /* Wait for handshake */
> + udelay(5);
> +
> + return ret;
> +}
> +
> +int imx_blk_ctl_power_on(struct generic_pm_domain *domain)

static?

> +{
> + struct imx_blk_ctl_domain *pd = to_imx_blk_ctl_pd(domain);
> + struct imx_blk_ctl *blk_ctl = pd->blk_ctl;
> + struct regmap *regmap = blk_ctl->regmap;
> + const struct imx_blk_ctl_hw *hw = &blk_ctl->dev_data->pds[pd->id];
> + int ret;
> +
> + mutex_lock(&blk_ctl->lock);
> +
> + ret = clk_bulk_prepare_enable(blk_ctl->num_clks, blk_ctl->clks);
> + if (ret) {
> + mutex_unlock(&blk_ctl->lock);
> + return ret;
> + }
> +
> + if (hw->flags & IMX_BLK_CTL_PD_HANDSHAKE) {
> + ret = imx_blk_ctl_enable_hsk(blk_ctl->dev);
> + if (ret)
> + dev_err(blk_ctl->dev, "Hankshake failed when power on\n");
> +
> + goto disable_clk;

Goto disable_clk regardless of the ret check?

> + }
> +
> + if (hw->flags & IMX_BLK_CTL_PD_RESET) {
> + ret = regmap_clear_bits(regmap, hw->rst_offset, hw->rst_mask);
> + if (ret)
> + goto disable_clk;
> + }
> +
> + /* Wait for reset propagate */
> + udelay(5);

The delay will be there even when IMX_BLK_CTL_PD_RESET is not set.

> +
> + if (hw->flags & IMX_BLK_CTL_PD_RESET) {
> + ret = regmap_update_bits(regmap, hw->rst_offset, hw->rst_mask, hw->rst_mask);
> + if (ret)
> + goto disable_clk;
> + }
> +
> + ret = regmap_update_bits(regmap, hw->offset, hw->mask, hw->mask);
> + if (ret)
> + goto disable_clk;

Useless goto.

> +
> +disable_clk:
> + clk_bulk_disable_unprepare(blk_ctl->num_clks, blk_ctl->clks);
> +
> + mutex_unlock(&blk_ctl->lock);
> +
> + return ret;
> +}
> +
> +int imx_blk_ctl_power_off(struct generic_pm_domain *domain)
> +{
> + struct imx_blk_ctl_domain *pd = to_imx_blk_ctl_pd(domain);
> + struct imx_blk_ctl *blk_ctl = pd->blk_ctl;
> + struct regmap *regmap = blk_ctl->regmap;
> + const struct imx_blk_ctl_hw *hw = &blk_ctl->dev_data->pds[pd->id];
> + int ret;
> +
> + mutex_lock(&blk_ctl->lock);
> +
> + ret = clk_bulk_prepare_enable(blk_ctl->num_clks, blk_ctl->clks);
> + if (ret) {
> + mutex_unlock(&blk_ctl->lock);
> + return ret;
> + }
> +
> + if (!(hw->flags & IMX_BLK_CTL_PD_HANDSHAKE)) {
> + ret = regmap_clear_bits(regmap, hw->offset, hw->mask);
> + if (ret)
> + goto hsk_fail;
> +
> + if (hw->flags & IMX_BLK_CTL_PD_RESET) {
> + ret = regmap_clear_bits(regmap, hw->rst_offset, hw->rst_mask);
> + if (ret)
> + goto hsk_fail;
> + }
> + }
> +
> + if (hw->flags & IMX_BLK_CTL_PD_HANDSHAKE) {
> + ret = imx_blk_ctl_enable_hsk(blk_ctl->dev);
> + if (ret)
> + dev_err(blk_ctl->dev, "Hankshake failed when power off\n");
> + }
> +
> +hsk_fail:

You use disable_clk in above function for the same code. Inconsistent
labeling strategy.

> + clk_bulk_disable_unprepare(blk_ctl->num_clks, blk_ctl->clks);
> +
> + mutex_unlock(&blk_ctl->lock);
> +
> + return ret;
> +}
> +
> +static int imx_blk_ctl_probe(struct platform_device *pdev)
> +{
> + struct imx_blk_ctl_domain *domain = pdev->dev.platform_data;
> + struct imx_blk_ctl *blk_ctl = domain->blk_ctl;
> + struct generic_pm_domain *parent_genpd;
> + struct device *dev = &pdev->dev;
> + struct device *active_pd;
> + int ret;
> +
> + pdev->dev.of_node = blk_ctl->dev->of_node;

Have a newline.

> + if (domain->hw->active_pd_name) {
> + active_pd = dev_pm_domain_attach_by_name(dev, domain->hw->active_pd_name);
> + if (IS_ERR_OR_NULL(active_pd)) {
> + ret = PTR_ERR(active_pd) ? : -ENODATA;
> + pdev->dev.of_node = NULL;

Why is this necessary?

> + return ret;
> + }

Have a newline.

> + domain->active_pd = active_pd;
> + } else {
> + if (!blk_ctl->bus_domain) {
> + pdev->dev.of_node = NULL;
> + return -EPROBE_DEFER;
> + }
> + }
> +
> + if (domain->hw->active_pd_name)
> + parent_genpd = pd_to_genpd(active_pd->pm_domain);
> + else
> + parent_genpd = blk_ctl->bus_domain;
> +
> + if (pm_genpd_add_subdomain(parent_genpd, &domain->genpd)) {
> + pr_warn("failed to add subdomain: %s\n", domain->genpd.name);

dev_warn()?

> + } else {
> + mutex_lock(&blk_ctl->lock);
> + domain->hooked = true;
> + mutex_unlock(&blk_ctl->lock);
> + }
> +
> + return 0;
> +}
> +
> +static int imx_blk_ctl_remove(struct platform_device *pdev)
> +{
> + struct imx_blk_ctl_domain *domain = pdev->dev.platform_data;
> + struct imx_blk_ctl *blk_ctl = domain->blk_ctl;
> + struct generic_pm_domain *parent_genpd;
> + struct device *active_pd;
> +
> + pdev->dev.of_node = blk_ctl->dev->of_node;

Why is this needed for .remove?

I stop right here. The patch really needs some level cross reviewing.

Shawn

> + if (domain->hw->active_pd_name)
> + parent_genpd = pd_to_genpd(active_pd->pm_domain);
> + else
> + parent_genpd = blk_ctl->bus_domain;
> +
> + pm_genpd_remove_subdomain(parent_genpd, &domain->genpd);
> +
> + mutex_lock(&blk_ctl->lock);
> + domain->hooked = false;
> + mutex_unlock(&blk_ctl->lock);
> +
> + if (domain->hw->active_pd_name)
> + dev_pm_domain_detach(domain->active_pd, false);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id imx_blk_ctl_id[] = {
> + { "imx-vpumix-blk-ctl", },
> + { "imx-dispmix-blk-ctl", },
> + { },
> +};
> +
> +static struct platform_driver imx_blk_ctl_driver = {
> + .driver = {
> + .name = "imx-blk-ctl",
> + },
> + .probe = imx_blk_ctl_probe,
> + .remove = imx_blk_ctl_remove,
> + .id_table = imx_blk_ctl_id,
> +};
> +builtin_platform_driver(imx_blk_ctl_driver)
> +
> +static struct generic_pm_domain *imx_blk_ctl_genpd_xlate(struct of_phandle_args *genpdspec,
> + void *data)
> +{
> + struct genpd_onecell_data *genpd_data = data;
> + unsigned int idx = genpdspec->args[0];
> + struct imx_blk_ctl_domain *domain;
> + struct generic_pm_domain *genpd = ERR_PTR(-EPROBE_DEFER);
> +
> + if (genpdspec->args_count != 1)
> + return ERR_PTR(-EINVAL);
> +
> + if (idx >= genpd_data->num_domains) {
> + pr_err("%s: invalid domain index %u\n", __func__, idx);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + if (!genpd_data->domains[idx])
> + return ERR_PTR(-ENOENT);
> +
> + domain = to_imx_blk_ctl_pd(genpd_data->domains[idx]);
> + mutex_lock(&domain->blk_ctl->lock);
> + if (domain->hooked)
> + genpd = genpd_data->domains[idx];
> + mutex_unlock(&domain->blk_ctl->lock);
> +
> + return genpd;
> +}
> +
> +int imx_blk_ctl_register(struct device *dev)
> +{
> + struct imx_blk_ctl *blk_ctl = dev_get_drvdata(dev);
> + const struct imx_blk_ctl_dev_data *dev_data = blk_ctl->dev_data;
> + int num = dev_data->pds_num;
> + struct imx_blk_ctl_domain *domain;
> + struct generic_pm_domain *genpd;
> + struct platform_device *pd_pdev;
> + int domain_index;
> + int i, ret;
> +
> + blk_ctl->onecell_data.num_domains = num;
> + blk_ctl->onecell_data.xlate = imx_blk_ctl_genpd_xlate;
> + blk_ctl->onecell_data.domains = devm_kcalloc(dev, num, sizeof(struct generic_pm_domain *),
> + GFP_KERNEL);
> + if (!blk_ctl->onecell_data.domains)
> + return -ENOMEM;
> +
> + for (i = 0; i < num; i++) {
> + domain_index = dev_data->pds[i].id;
> + if (domain_index >= num) {
> + dev_warn(dev, "Domain index %d is out of bounds\n", domain_index);
> + continue;
> + }
> +
> + domain = devm_kzalloc(dev, sizeof(struct imx_blk_ctl_domain), GFP_KERNEL);
> + if (!domain)
> + goto error;
> +
> + pd_pdev = platform_device_alloc(dev_data->name, domain_index);
> + if (!pd_pdev) {
> + dev_err(dev, "Failed to allocate platform device\n");
> + goto error;
> + }
> +
> + pd_pdev->dev.platform_data = domain;
> +
> + domain->blk_ctl = blk_ctl;
> + domain->hw = &dev_data->pds[i];
> + domain->id = domain_index;
> + domain->genpd.name = dev_data->pds[i].name;
> + domain->genpd.power_off = imx_blk_ctl_power_off;
> + domain->genpd.power_on = imx_blk_ctl_power_on;
> + domain->dev = &pd_pdev->dev;
> + domain->hooked = false;
> +
> + ret = pm_genpd_init(&domain->genpd, NULL, true);
> + pd_pdev->dev.parent = dev;
> +
> + if (domain->hw->flags & IMX_BLK_CTL_PD_HANDSHAKE)
> + blk_ctl->bus_domain = &domain->genpd;
> +
> + ret = platform_device_add(pd_pdev);
> + if (ret) {
> + platform_device_put(pd_pdev);
> + goto error;
> + }
> + blk_ctl->onecell_data.domains[i] = &domain->genpd;
> + }
> +
> + return of_genpd_add_provider_onecell(dev->of_node, &blk_ctl->onecell_data);
> +
> +error:
> + for (; i >= 0; i--) {
> + genpd = blk_ctl->onecell_data.domains[i];
> + if (!genpd)
> + continue;
> + domain = to_imx_blk_ctl_pd(genpd);
> + if (domain->dev)
> + platform_device_put(to_platform_device(domain->dev));
> + }
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(imx_blk_ctl_register);
> +
> +const struct dev_pm_ops imx_blk_ctl_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> + pm_runtime_force_resume)
> +};
> +EXPORT_SYMBOL_GPL(imx_blk_ctl_pm_ops);
> diff --git a/drivers/soc/imx/blk-ctl.h b/drivers/soc/imx/blk-ctl.h
> new file mode 100644
> index 000000000000..6780d00ec8c5
> --- /dev/null
> +++ b/drivers/soc/imx/blk-ctl.h
> @@ -0,0 +1,85 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __SOC_IMX_BLK_CTL_H
> +#define __SOC_IMX_BLK_CTL_H
> +
> +enum imx_blk_ctl_pd_type {
> + BLK_CTL_PD,
> +};
> +
> +struct imx_blk_ctl_hw {
> + int type;
> + char *name;
> + char *active_pd_name;
> + u32 offset;
> + u32 mask;
> + u32 flags;
> + u32 id;
> + u32 rst_offset;
> + u32 rst_mask;
> + u32 errata;
> +};
> +
> +struct imx_blk_ctl_domain {
> + struct generic_pm_domain genpd;
> + struct device *active_pd;
> + struct imx_blk_ctl *blk_ctl;
> + struct imx_blk_ctl_hw *hw;
> + struct device *dev;
> + bool hooked;
> + u32 id;
> +};
> +
> +struct imx_blk_ctl_dev_data {
> + struct regmap_config config;
> + struct imx_blk_ctl_hw *pds;
> + struct imx_blk_ctl_hw *hw_hsk;
> + u32 pds_num;
> + u32 max_num;
> + char *name;
> +};
> +
> +struct imx_blk_ctl {
> + struct device *dev;
> + struct regmap *regmap;
> + struct genpd_onecell_data onecell_data;
> + const struct imx_blk_ctl_dev_data *dev_data;
> + struct clk_bulk_data *clks;
> + u32 num_clks;
> + struct generic_pm_domain *bus_domain;
> +
> + struct mutex lock;
> +};
> +
> +#define IMX_BLK_CTL(_type, _name, _active_pd, _id, _offset, _mask, _rst_offset, _rst_mask, \
> + _flags, _errata) \
> + { \
> + .type = _type, \
> + .name = _name, \
> + .active_pd_name = _active_pd, \
> + .id = _id, \
> + .offset = _offset, \
> + .mask = _mask, \
> + .flags = _flags, \
> + .rst_offset = _rst_offset, \
> + .rst_mask = _rst_mask, \
> + .errata = _errata, \
> + }
> +
> +#define IMX_BLK_CTL_PD(_name, _active_pd, _id, _offset, _mask, _rst_offset, _rst_mask, _flags) \
> + IMX_BLK_CTL(BLK_CTL_PD, _name, _active_pd, _id, _offset, _mask, _rst_offset, \
> + _rst_mask, _flags, 0)
> +
> +#define IMX_BLK_CTL_PD_ERRATA(_name, _active_pd, _id, _offset, _mask, _rst_offset, _rst_mask, \
> + _flags, _errata) \
> + IMX_BLK_CTL(BLK_CTL_PD, _name, _active_pd, _id, _offset, _mask, _rst_offset, \
> + _rst_mask, _flags, _errata)
> +
> +int imx_blk_ctl_register(struct device *dev);
> +
> +#define IMX_BLK_CTL_PD_HANDSHAKE BIT(0)
> +#define IMX_BLK_CTL_PD_RESET BIT(1)
> +#define IMX_BLK_CTL_PD_BUS BIT(2)
> +
> +const extern struct dev_pm_ops imx_blk_ctl_pm_ops;
> +
> +#endif
> --
> 2.30.0
>

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