lkml.org 
[lkml]   [2017]   [Jun]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v4 23/28] soc: actions: Add Owl SPS
    Date
    Implement S500 Smart Power System power-gating.
    For now flag PD_CPU2 and PD_CPU3 as always-on.

    Based on LeMaker linux-actions tree.

    Signed-off-by: Andreas Färber <afaerber@suse.de>
    ---
    v3 -> v4:
    * Added genpd_flags field and set GENPD_FLAG_ALWAYS_ON for CPU2/CPU3
    * Added debug output

    v3: new

    drivers/soc/Kconfig | 1 +
    drivers/soc/Makefile | 1 +
    drivers/soc/actions/Kconfig | 12 ++
    drivers/soc/actions/Makefile | 1 +
    drivers/soc/actions/owl-sps.c | 252 ++++++++++++++++++++++++++++++++++++++++++
    5 files changed, 267 insertions(+)
    create mode 100644 drivers/soc/actions/Kconfig
    create mode 100644 drivers/soc/actions/Makefile
    create mode 100644 drivers/soc/actions/owl-sps.c

    diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
    index 309643fe35f9..a63eb0ffba98 100644
    --- a/drivers/soc/Kconfig
    +++ b/drivers/soc/Kconfig
    @@ -1,5 +1,6 @@
    menu "SOC (System On Chip) specific Drivers"

    +source "drivers/soc/actions/Kconfig"
    source "drivers/soc/atmel/Kconfig"
    source "drivers/soc/bcm/Kconfig"
    source "drivers/soc/fsl/Kconfig"
    diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
    index 824b44281efa..a3b27a33c309 100644
    --- a/drivers/soc/Makefile
    +++ b/drivers/soc/Makefile
    @@ -2,6 +2,7 @@
    # Makefile for the Linux Kernel SOC specific device drivers.
    #

    +obj-$(CONFIG_ARCH_ACTIONS) += actions/
    obj-$(CONFIG_ARCH_AT91) += atmel/
    obj-y += bcm/
    obj-$(CONFIG_ARCH_DOVE) += dove/
    diff --git a/drivers/soc/actions/Kconfig b/drivers/soc/actions/Kconfig
    new file mode 100644
    index 000000000000..bdf827d5ce78
    --- /dev/null
    +++ b/drivers/soc/actions/Kconfig
    @@ -0,0 +1,12 @@
    +if ARCH_ACTIONS || COMPILE_TEST
    +
    +config OWL_PM_DOMAINS
    + bool "Actions Semi SPS power domains"
    + depends on PM
    + select PM_GENERIC_DOMAINS
    + help
    + Say 'y' here to enable support for Smart Power System (SPS)
    + power-gating on Actions Semiconductor S500 SoC.
    + If unsure, say 'n'.
    +
    +endif
    diff --git a/drivers/soc/actions/Makefile b/drivers/soc/actions/Makefile
    new file mode 100644
    index 000000000000..720c34ed16e4
    --- /dev/null
    +++ b/drivers/soc/actions/Makefile
    @@ -0,0 +1 @@
    +obj-$(CONFIG_OWL_PM_DOMAINS) += owl-sps.o
    diff --git a/drivers/soc/actions/owl-sps.c b/drivers/soc/actions/owl-sps.c
    new file mode 100644
    index 000000000000..d9160579b542
    --- /dev/null
    +++ b/drivers/soc/actions/owl-sps.c
    @@ -0,0 +1,252 @@
    +/*
    + * Actions Semi Owl Smart Power System (SPS)
    + *
    + * Copyright 2012 Actions Semi Inc.
    + * Author: Actions Semi, Inc.
    + *
    + * Copyright (c) 2017 Andreas Färber
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License as published by the
    + * Free Software Foundation; either version 2 of the License, or (at your
    + * option) any later version.
    + */
    +
    +#include <linux/delay.h>
    +#include <linux/io.h>
    +#include <linux/of_address.h>
    +#include <linux/of_platform.h>
    +#include <linux/pm_domain.h>
    +#include <dt-bindings/power/s500-powergate.h>
    +
    +#define OWL_SPS_PG_CTL 0x0
    +
    +struct owl_sps_domain_info {
    + const char *name;
    + int pwr_bit;
    + int ack_bit;
    + unsigned int genpd_flags;
    +};
    +
    +struct owl_sps_info {
    + unsigned num_domains;
    + const struct owl_sps_domain_info *domains;
    +};
    +
    +struct owl_sps {
    + struct device *dev;
    + const struct owl_sps_info *info;
    + void __iomem *base;
    + struct genpd_onecell_data genpd_data;
    + struct generic_pm_domain *domains[];
    +};
    +
    +#define to_owl_pd(gpd) container_of(gpd, struct owl_sps_domain, genpd)
    +
    +struct owl_sps_domain {
    + struct generic_pm_domain genpd;
    + const struct owl_sps_domain_info *info;
    + struct owl_sps *sps;
    +};
    +
    +static int owl_sps_set_power(struct owl_sps_domain *pd, bool enable)
    +{
    + u32 val, pwr_mask, ack_mask;
    + int timeout;
    + bool ack;
    +
    + ack_mask = BIT(pd->info->ack_bit);
    + pwr_mask = BIT(pd->info->pwr_bit);
    + val = readl(pd->sps->base + OWL_SPS_PG_CTL);
    + ack = val & ack_mask;
    +
    + if (ack == enable)
    + return 0;
    +
    + if (enable)
    + val |= pwr_mask;
    + else
    + val &= ~pwr_mask;
    +
    + writel(val, pd->sps->base + OWL_SPS_PG_CTL);
    +
    + for (timeout = 5000; timeout > 0; timeout -= 50) {
    + val = readl(pd->sps->base + OWL_SPS_PG_CTL);
    + if ((val & ack_mask) == (enable ? ack_mask : 0))
    + break;
    + udelay(50);
    + }
    + if (timeout <= 0)
    + return -ETIMEDOUT;
    +
    + udelay(10);
    +
    + return 0;
    +}
    +
    +static int owl_sps_power_on(struct generic_pm_domain *domain)
    +{
    + struct owl_sps_domain *pd = to_owl_pd(domain);
    +
    + dev_dbg(pd->sps->dev, "%s power on", pd->info->name);
    +
    + return owl_sps_set_power(pd, true);
    +}
    +
    +static int owl_sps_power_off(struct generic_pm_domain *domain)
    +{
    + struct owl_sps_domain *pd = to_owl_pd(domain);
    +
    + dev_dbg(pd->sps->dev, "%s power off", pd->info->name);
    +
    + return owl_sps_set_power(pd, false);
    +}
    +
    +static int owl_sps_init_domain(struct owl_sps *sps, int index)
    +{
    + struct owl_sps_domain *pd;
    +
    + pd = devm_kzalloc(sps->dev, sizeof(*pd), GFP_KERNEL);
    + if (!pd)
    + return -ENOMEM;
    +
    + pd->info = &sps->info->domains[index];
    + pd->sps = sps;
    +
    + pd->genpd.name = pd->info->name;
    + pd->genpd.power_on = owl_sps_power_on;
    + pd->genpd.power_off = owl_sps_power_off;
    + pd->genpd.flags = pd->info->genpd_flags;
    + pm_genpd_init(&pd->genpd, NULL, false);
    +
    + sps->genpd_data.domains[index] = &pd->genpd;
    +
    + return 0;
    +}
    +
    +static int owl_sps_probe(struct platform_device *pdev)
    +{
    + const struct of_device_id *match;
    + const struct owl_sps_info *sps_info;
    + struct owl_sps *sps;
    + int i, ret;
    +
    + if (!pdev->dev.of_node) {
    + dev_err(&pdev->dev, "no device node\n");
    + return -ENODEV;
    + }
    +
    + match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
    + if (!match || !match->data) {
    + dev_err(&pdev->dev, "unknown compatible or missing data\n");
    + return -EINVAL;
    + }
    +
    + sps_info = match->data;
    +
    + sps = devm_kzalloc(&pdev->dev, sizeof(*sps) +
    + sps_info->num_domains * sizeof(sps->domains[0]),
    + GFP_KERNEL);
    + if (!sps)
    + return -ENOMEM;
    +
    + sps->base = of_io_request_and_map(pdev->dev.of_node, 0, "owl-sps");
    + if (IS_ERR(sps->base)) {
    + dev_err(&pdev->dev, "failed to map sps registers\n");
    + return PTR_ERR(sps->base);
    + }
    +
    + sps->dev = &pdev->dev;
    + sps->info = sps_info;
    + sps->genpd_data.domains = sps->domains;
    + sps->genpd_data.num_domains = sps_info->num_domains;
    +
    + for (i = 0; i < sps_info->num_domains; i++) {
    + ret = owl_sps_init_domain(sps, i);
    + if (ret)
    + return ret;
    + }
    +
    + ret = of_genpd_add_provider_onecell(pdev->dev.of_node, &sps->genpd_data);
    + if (ret) {
    + dev_err(&pdev->dev, "failed to add provider (%d)", ret);
    + return ret;
    + }
    +
    + return 0;
    +}
    +
    +static const struct owl_sps_domain_info s500_sps_domains[] = {
    + [S500_PD_VDE] = {
    + .name = "VDE",
    + .pwr_bit = 0,
    + .ack_bit = 16,
    + },
    + [S500_PD_VCE_SI] = {
    + .name = "VCE_SI",
    + .pwr_bit = 1,
    + .ack_bit = 17,
    + },
    + [S500_PD_USB2_1] = {
    + .name = "USB2_1",
    + .pwr_bit = 2,
    + .ack_bit = 18,
    + },
    + [S500_PD_CPU2] = {
    + .name = "CPU2",
    + .pwr_bit = 5,
    + .ack_bit = 21,
    + .genpd_flags = GENPD_FLAG_ALWAYS_ON,
    + },
    + [S500_PD_CPU3] = {
    + .name = "CPU3",
    + .pwr_bit = 6,
    + .ack_bit = 22,
    + .genpd_flags = GENPD_FLAG_ALWAYS_ON,
    + },
    + [S500_PD_DMA] = {
    + .name = "DMA",
    + .pwr_bit = 8,
    + .ack_bit = 12,
    + },
    + [S500_PD_DS] = {
    + .name = "DS",
    + .pwr_bit = 9,
    + .ack_bit = 13,
    + },
    + [S500_PD_USB3] = {
    + .name = "USB3",
    + .pwr_bit = 10,
    + .ack_bit = 14,
    + },
    + [S500_PD_USB2_0] = {
    + .name = "USB2_0",
    + .pwr_bit = 11,
    + .ack_bit = 15,
    + },
    +};
    +
    +static const struct owl_sps_info s500_sps_info = {
    + .num_domains = ARRAY_SIZE(s500_sps_domains),
    + .domains = s500_sps_domains,
    +};
    +
    +static const struct of_device_id owl_sps_of_matches[] = {
    + { .compatible = "actions,s500-sps", .data = &s500_sps_info },
    + { }
    +};
    +
    +static struct platform_driver owl_sps_platform_driver = {
    + .probe = owl_sps_probe,
    + .driver = {
    + .name = "owl-sps",
    + .of_match_table = owl_sps_of_matches,
    + .suppress_bind_attrs = true,
    + },
    +};
    +
    +static int __init owl_sps_init(void)
    +{
    + return platform_driver_register(&owl_sps_platform_driver);
    +}
    +postcore_initcall(owl_sps_init);
    --
    2.12.3
    \
     
     \ /
      Last update: 2017-06-12 00:37    [W:3.222 / U:0.076 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site