[PATCH v5 21/26] soc: actions: Add Owl SPS
Andreas Färber
afaerber at suse.de
Sun Jun 18 20:40:21 PDT 2017
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 at suse.de>
---
v4 -> v5:
* Updated for header file rename
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 f8c0286f8a65..07fc0ac51c52 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 c0b2a610efcd..9241125416ba 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..8abb72f01929
--- /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/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);
--
2.12.3
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