soc: actions: Add Owl SPS

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>
This commit is contained in:
Andreas Färber 2017-02-26 04:09:57 +01:00
parent 4ca3fbd981
commit aa9f800ded
5 changed files with 267 additions and 0 deletions

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@ -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"

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@ -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/

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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

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obj-$(CONFIG_OWL_PM_DOMAINS) += owl-sps.o

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/*
* 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/owl-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);