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Date: Mon, 11 May 2020 21:25:17 +0200
From: Lubomir Rintel <lkundrak@...sk>
To: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH v2 10/10] clk: mmp2: Add support for power islands
Apart from the clocks and resets, the PMU hardware also controls power
to peripherals that are on separate power islands. On MMP2, that's the
GC860 GPU and the SSPA audio interface, while on MMP3 also the camera
interface is on a separate island, along with the pair of GC2000 and GC300
GPUs and the SSPA.
Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
arch/arm/mach-mmp/Kconfig | 2 +
drivers/clk/mmp/Makefile | 2 +-
drivers/clk/mmp/clk-of-mmp2.c | 42 +++++++++++++
drivers/clk/mmp/clk.h | 10 +++
drivers/clk/mmp/pwr-island.c | 115 ++++++++++++++++++++++++++++++++++
5 files changed, 170 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/mmp/pwr-island.c
diff --git a/arch/arm/mach-mmp/Kconfig b/arch/arm/mach-mmp/Kconfig
index b58a03b18bde..8a1519e6be6f 100644
--- a/arch/arm/mach-mmp/Kconfig
+++ b/arch/arm/mach-mmp/Kconfig
@@ -125,6 +125,8 @@ config MACH_MMP2_DT
select PINCTRL_SINGLE
select ARCH_HAS_RESET_CONTROLLER
select CPU_PJ4
+ select PM_GENERIC_DOMAINS if PM
+ select PM_GENERIC_DOMAINS_OF if PM && OF
help
Include support for Marvell MMP2 based platforms using
the device tree.
diff --git a/drivers/clk/mmp/Makefile b/drivers/clk/mmp/Makefile
index 14dc8a8a9d08..f9fab883a13b 100644
--- a/drivers/clk/mmp/Makefile
+++ b/drivers/clk/mmp/Makefile
@@ -8,7 +8,7 @@ obj-y += clk-apbc.o clk-apmu.o clk-frac.o clk-mix.o clk-gate.o clk.o
obj-$(CONFIG_RESET_CONTROLLER) += reset.o
obj-$(CONFIG_MACH_MMP_DT) += clk-of-pxa168.o clk-of-pxa910.o
-obj-$(CONFIG_COMMON_CLK_MMP2) += clk-of-mmp2.o clk-pll.o
+obj-$(CONFIG_COMMON_CLK_MMP2) += clk-of-mmp2.o clk-pll.o pwr-island.o
obj-$(CONFIG_CPU_PXA168) += clk-pxa168.o
obj-$(CONFIG_CPU_PXA910) += clk-pxa910.o
diff --git a/drivers/clk/mmp/clk-of-mmp2.c b/drivers/clk/mmp/clk-of-mmp2.c
index c686c16fca82..84498d1c3544 100644
--- a/drivers/clk/mmp/clk-of-mmp2.c
+++ b/drivers/clk/mmp/clk-of-mmp2.c
@@ -17,8 +17,10 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/of_address.h>
+#include <linux/clk.h>
#include <dt-bindings/clock/marvell,mmp2.h>
+#include <dt-bindings/power/marvell,mmp2.h>
#include "clk.h"
#include "reset.h"
@@ -63,6 +65,7 @@
#define APMU_USBHSIC1 0xfc
#define APMU_GPU 0xcc
#define APMU_AUDIO 0x10c
+#define APMU_CAMERA 0x1fc
#define MPMU_FCCR 0x8
#define MPMU_POSR 0x10
@@ -86,6 +89,8 @@ enum mmp2_clk_model {
struct mmp2_clk_unit {
struct mmp_clk_unit unit;
enum mmp2_clk_model model;
+ struct genpd_onecell_data pd_data;
+ struct generic_pm_domain *pm_domains[MMP2_NR_POWER_DOMAINS];
void __iomem *mpmu_base;
void __iomem *apmu_base;
void __iomem *apbc_base;
@@ -473,6 +478,41 @@ static void mmp2_clk_reset_init(struct device_node *np,
mmp_clk_reset_register(np, cells, nr_resets);
}
+static void mmp2_pm_domain_init(struct device_node *np,
+ struct mmp2_clk_unit *pxa_unit)
+{
+ if (pxa_unit->model == CLK_MODEL_MMP3) {
+ pxa_unit->pm_domains[MMP2_POWER_DOMAIN_GPU]
+ = mmp_pm_domain_register("GPU",
+ pxa_unit->apmu_base + APMU_GPU,
+ 0x0600, 0x40003, 0x18000c, 0, &gpu_lock);
+ } else {
+ pxa_unit->pm_domains[MMP2_POWER_DOMAIN_GPU]
+ = mmp_pm_domain_register("GPU",
+ pxa_unit->apmu_base + APMU_GPU,
+ 0x8600, 0x00003, 0x00000c,
+ MMP_PM_DOMAIN_NO_DISABLE, &gpu_lock);
+ }
+ pxa_unit->pd_data.num_domains++;
+
+ pxa_unit->pm_domains[MMP2_POWER_DOMAIN_AUDIO]
+ = mmp_pm_domain_register("Audio",
+ pxa_unit->apmu_base + APMU_AUDIO,
+ 0x600, 0, 0, 0, &audio_lock);
+ pxa_unit->pd_data.num_domains++;
+
+ if (pxa_unit->model == CLK_MODEL_MMP3) {
+ pxa_unit->pm_domains[MMP3_POWER_DOMAIN_CAMERA]
+ = mmp_pm_domain_register("Camera",
+ pxa_unit->apmu_base + APMU_CAMERA,
+ 0x600, 0, 0, 0, NULL);
+ pxa_unit->pd_data.num_domains++;
+ }
+
+ pxa_unit->pd_data.domains = pxa_unit->pm_domains;
+ of_genpd_add_provider_onecell(np, &pxa_unit->pd_data);
+}
+
static void __init mmp2_clk_init(struct device_node *np)
{
struct mmp2_clk_unit *pxa_unit;
@@ -504,6 +544,8 @@ static void __init mmp2_clk_init(struct device_node *np)
goto unmap_apmu_region;
}
+ mmp2_pm_domain_init(np, pxa_unit);
+
mmp_clk_init(np, &pxa_unit->unit, MMP2_NR_CLKS);
mmp2_main_clk_init(pxa_unit);
diff --git a/drivers/clk/mmp/clk.h b/drivers/clk/mmp/clk.h
index 0efd5b0b2f01..bfa2adc24a7c 100644
--- a/drivers/clk/mmp/clk.h
+++ b/drivers/clk/mmp/clk.h
@@ -3,6 +3,7 @@
#define __MACH_MMP_CLK_H
#include <linux/clk-provider.h>
+#include <linux/pm_domain.h>
#include <linux/clkdev.h>
#define APBC_NO_BUS_CTRL BIT(0)
@@ -259,4 +260,13 @@ void mmp_clk_init(struct device_node *np, struct mmp_clk_unit *unit,
int nr_clks);
void mmp_clk_add(struct mmp_clk_unit *unit, unsigned int id,
struct clk *clk);
+
+/* Power islands */
+#define MMP_PM_DOMAIN_NO_DISABLE BIT(0)
+
+struct generic_pm_domain *mmp_pm_domain_register(const char *name,
+ void __iomem *reg,
+ u32 power_on, u32 reset, u32 clock_enable,
+ unsigned int flags, spinlock_t *lock);
+
#endif
diff --git a/drivers/clk/mmp/pwr-island.c b/drivers/clk/mmp/pwr-island.c
new file mode 100644
index 000000000000..ab57c0e995c1
--- /dev/null
+++ b/drivers/clk/mmp/pwr-island.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MMP PMU power island support
+ *
+ * Copyright (C) 2020 Lubomir Rintel <lkundrak@...sk>
+ */
+
+#include <linux/pm_domain.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+
+#include "clk.h"
+
+#define to_mmp_pm_domain(genpd) container_of(genpd, struct mmp_pm_domain, genpd)
+
+struct mmp_pm_domain {
+ struct generic_pm_domain genpd;
+ void __iomem *reg;
+ spinlock_t *lock;
+ u32 power_on;
+ u32 reset;
+ u32 clock_enable;
+ unsigned int flags;
+};
+
+static int mmp_pm_domain_power_on(struct generic_pm_domain *genpd)
+{
+ struct mmp_pm_domain *pm_domain = to_mmp_pm_domain(genpd);
+ unsigned long flags = 0;
+ u32 val;
+
+ if (pm_domain->lock)
+ spin_lock_irqsave(pm_domain->lock, flags);
+
+ val = readl(pm_domain->reg);
+
+ /* Turn on the power island */
+ val |= pm_domain->power_on;
+ writel(val, pm_domain->reg);
+
+ /* Disable isolation */
+ val |= 0x100;
+ writel(val, pm_domain->reg);
+
+ /* Some blocks need to be reset after a power up */
+ if (pm_domain->reset || pm_domain->clock_enable) {
+ u32 after_power_on = val;
+
+ val &= ~pm_domain->reset;
+ writel(val, pm_domain->reg);
+
+ val |= pm_domain->clock_enable;
+ writel(val, pm_domain->reg);
+
+ val |= pm_domain->reset;
+ writel(val, pm_domain->reg);
+
+ writel(after_power_on, pm_domain->reg);
+ }
+
+ if (pm_domain->lock)
+ spin_unlock_irqrestore(pm_domain->lock, flags);
+
+ return 0;
+}
+
+static int mmp_pm_domain_power_off(struct generic_pm_domain *genpd)
+{
+ struct mmp_pm_domain *pm_domain = to_mmp_pm_domain(genpd);
+ unsigned long flags = 0;
+ u32 val;
+
+ if (pm_domain->flags & MMP_PM_DOMAIN_NO_DISABLE)
+ return 0;
+
+ if (pm_domain->lock)
+ spin_lock_irqsave(pm_domain->lock, flags);
+
+ /* Turn off and isolate the the power island. */
+ val = readl(pm_domain->reg);
+ val &= ~pm_domain->power_on;
+ val &= ~0x100;
+ writel(val, pm_domain->reg);
+
+ if (pm_domain->lock)
+ spin_unlock_irqrestore(pm_domain->lock, flags);
+
+ return 0;
+}
+
+struct generic_pm_domain *mmp_pm_domain_register(const char *name,
+ void __iomem *reg,
+ u32 power_on, u32 reset, u32 clock_enable,
+ unsigned int flags, spinlock_t *lock)
+{
+ struct mmp_pm_domain *pm_domain;
+
+ pm_domain = kzalloc(sizeof(*pm_domain), GFP_KERNEL);
+ if (!pm_domain)
+ return ERR_PTR(-ENOMEM);
+
+ pm_domain->reg = reg;
+ pm_domain->power_on = power_on;
+ pm_domain->reset = reset;
+ pm_domain->clock_enable = clock_enable;
+ pm_domain->flags = flags;
+ pm_domain->lock = lock;
+
+ pm_genpd_init(&pm_domain->genpd, NULL, true);
+ pm_domain->genpd.name = name;
+ pm_domain->genpd.power_on = mmp_pm_domain_power_on;
+ pm_domain->genpd.power_off = mmp_pm_domain_power_off;
+
+ return &pm_domain->genpd;
+}
--
2.26.2
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