[U-Boot] [PATCH v2 18/40] ARM: tegra: Implement powergate support
Thierry Reding
thierry.reding at gmail.com
Tue Aug 26 17:34:06 CEST 2014
From: Thierry Reding <treding at nvidia.com>
Implement the powergate API that allows various power partitions to be
power up and down.
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
Changes in v2:
- wait for power-up/off operation to complete before returning
- document PCIE/VDEC mixup in REMOVE_CLAMPING register
- add symbolic name for REMOVE_CLAMPING register
- list all partitions available on existing SoCs
arch/arm/cpu/tegra-common/Makefile | 1 +
arch/arm/cpu/tegra-common/powergate.c | 102 +++++++++++++++++++++++++
arch/arm/include/asm/arch-tegra/powergate.h | 38 +++++++++
arch/arm/include/asm/arch-tegra114/powergate.h | 6 ++
arch/arm/include/asm/arch-tegra124/powergate.h | 6 ++
arch/arm/include/asm/arch-tegra20/powergate.h | 6 ++
arch/arm/include/asm/arch-tegra30/powergate.h | 6 ++
7 files changed, 165 insertions(+)
create mode 100644 arch/arm/cpu/tegra-common/powergate.c
create mode 100644 arch/arm/include/asm/arch-tegra/powergate.h
create mode 100644 arch/arm/include/asm/arch-tegra114/powergate.h
create mode 100644 arch/arm/include/asm/arch-tegra124/powergate.h
create mode 100644 arch/arm/include/asm/arch-tegra20/powergate.h
create mode 100644 arch/arm/include/asm/arch-tegra30/powergate.h
diff --git a/arch/arm/cpu/tegra-common/Makefile b/arch/arm/cpu/tegra-common/Makefile
index 892556e64451..fed618ba8fc9 100644
--- a/arch/arm/cpu/tegra-common/Makefile
+++ b/arch/arm/cpu/tegra-common/Makefile
@@ -13,4 +13,5 @@ obj-y += cache.o
obj-y += clock.o
obj-y += lowlevel_init.o
obj-y += pinmux-common.o
+obj-y += powergate.o
obj-$(CONFIG_DISPLAY_CPUINFO) += sys_info.o
diff --git a/arch/arm/cpu/tegra-common/powergate.c b/arch/arm/cpu/tegra-common/powergate.c
new file mode 100644
index 000000000000..439cff36b951
--- /dev/null
+++ b/arch/arm/cpu/tegra-common/powergate.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <errno.h>
+
+#include <asm/io.h>
+#include <asm/types.h>
+
+#include <asm/arch/powergate.h>
+#include <asm/arch/tegra.h>
+
+#define PWRGATE_TOGGLE 0x30
+#define PWRGATE_TOGGLE_START (1 << 8)
+
+#define REMOVE_CLAMPING 0x34
+
+#define PWRGATE_STATUS 0x38
+
+static int tegra_powergate_set(enum tegra_powergate id, bool state)
+{
+ u32 value, mask = state ? (1 << id) : 0, old_mask;
+ unsigned long start, timeout = 25;
+
+ value = readl(NV_PA_PMC_BASE + PWRGATE_STATUS);
+ old_mask = value & (1 << id);
+
+ if (mask == old_mask)
+ return 0;
+
+ writel(PWRGATE_TOGGLE_START | id, NV_PA_PMC_BASE + PWRGATE_TOGGLE);
+
+ start = get_timer(0);
+
+ while (get_timer(start) < timeout) {
+ value = readl(NV_PA_PMC_BASE + PWRGATE_STATUS);
+ if ((value & (1 << id)) == mask)
+ return 0;
+ }
+
+ return -ETIMEDOUT;
+}
+
+static int tegra_powergate_power_on(enum tegra_powergate id)
+{
+ return tegra_powergate_set(id, true);
+}
+
+int tegra_powergate_power_off(enum tegra_powergate id)
+{
+ return tegra_powergate_set(id, false);
+}
+
+static int tegra_powergate_remove_clamping(enum tegra_powergate id)
+{
+ unsigned long value;
+
+ /*
+ * The REMOVE_CLAMPING register has the bits for the PCIE and VDEC
+ * partitions reversed. This was originally introduced on Tegra20 but
+ * has since been carried forward for backwards-compatibility.
+ */
+ if (id == TEGRA_POWERGATE_VDEC)
+ value = 1 << TEGRA_POWERGATE_PCIE;
+ else if (id == TEGRA_POWERGATE_PCIE)
+ value = 1 << TEGRA_POWERGATE_VDEC;
+ else
+ value = 1 << id;
+
+ writel(value, NV_PA_PMC_BASE + REMOVE_CLAMPING);
+
+ return 0;
+}
+
+int tegra_powergate_sequence_power_up(enum tegra_powergate id,
+ enum periph_id periph)
+{
+ int err;
+
+ reset_set_enable(periph, 1);
+
+ err = tegra_powergate_power_on(id);
+ if (err < 0)
+ return err;
+
+ clock_enable(periph);
+
+ udelay(10);
+
+ err = tegra_powergate_remove_clamping(id);
+ if (err < 0)
+ return err;
+
+ udelay(10);
+
+ reset_set_enable(periph, 0);
+
+ return 0;
+}
diff --git a/arch/arm/include/asm/arch-tegra/powergate.h b/arch/arm/include/asm/arch-tegra/powergate.h
new file mode 100644
index 000000000000..130b58bef1b4
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra/powergate.h
@@ -0,0 +1,38 @@
+#ifndef _TEGRA_POWERGATE_H_
+#define _TEGRA_POWERGATE_H_
+
+#include <asm/arch/clock.h>
+
+enum tegra_powergate {
+ TEGRA_POWERGATE_CPU,
+ TEGRA_POWERGATE_3D,
+ TEGRA_POWERGATE_VENC,
+ TEGRA_POWERGATE_PCIE,
+ TEGRA_POWERGATE_VDEC,
+ TEGRA_POWERGATE_L2,
+ TEGRA_POWERGATE_MPE,
+ TEGRA_POWERGATE_HEG,
+ TEGRA_POWERGATE_SATA,
+ TEGRA_POWERGATE_CPU1,
+ TEGRA_POWERGATE_CPU2,
+ TEGRA_POWERGATE_CPU3,
+ TEGRA_POWERGATE_CELP,
+ TEGRA_POWERGATE_3D1,
+ TEGRA_POWERGATE_CPU0,
+ TEGRA_POWERGATE_C0NC,
+ TEGRA_POWERGATE_C1NC,
+ TEGRA_POWERGATE_SOR,
+ TEGRA_POWERGATE_DIS,
+ TEGRA_POWERGATE_DISB,
+ TEGRA_POWERGATE_XUSBA,
+ TEGRA_POWERGATE_XUSBB,
+ TEGRA_POWERGATE_XUSBC,
+ TEGRA_POWERGATE_VIC,
+ TEGRA_POWERGATE_IRAM,
+};
+
+int tegra_powergate_sequence_power_up(enum tegra_powergate id,
+ enum periph_id periph);
+int tegra_powergate_power_off(enum tegra_powergate id);
+
+#endif
diff --git a/arch/arm/include/asm/arch-tegra114/powergate.h b/arch/arm/include/asm/arch-tegra114/powergate.h
new file mode 100644
index 000000000000..260ea801b81b
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra114/powergate.h
@@ -0,0 +1,6 @@
+#ifndef _TEGRA114_POWERGATE_H_
+#define _TEGRA114_POWERGATE_H_
+
+#include <asm/arch-tegra/powergate.h>
+
+#endif /* _TEGRA114_POWERGATE_H_ */
diff --git a/arch/arm/include/asm/arch-tegra124/powergate.h b/arch/arm/include/asm/arch-tegra124/powergate.h
new file mode 100644
index 000000000000..8a0cfbaf9665
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra124/powergate.h
@@ -0,0 +1,6 @@
+#ifndef _TEGRA124_POWERGATE_H_
+#define _TEGRA124_POWERGATE_H_
+
+#include <asm/arch-tegra/powergate.h>
+
+#endif /* _TEGRA124_POWERGATE_H_ */
diff --git a/arch/arm/include/asm/arch-tegra20/powergate.h b/arch/arm/include/asm/arch-tegra20/powergate.h
new file mode 100644
index 000000000000..439d88b7022a
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra20/powergate.h
@@ -0,0 +1,6 @@
+#ifndef _TEGRA20_POWERGATE_H_
+#define _TEGRA20_POWERGATE_H_
+
+#include <asm/arch-tegra/powergate.h>
+
+#endif /* _TEGRA20_POWERGATE_H_ */
diff --git a/arch/arm/include/asm/arch-tegra30/powergate.h b/arch/arm/include/asm/arch-tegra30/powergate.h
new file mode 100644
index 000000000000..c70e44b6216d
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra30/powergate.h
@@ -0,0 +1,6 @@
+#ifndef _TEGRA30_POWERGATE_H_
+#define _TEGRA30_POWERGATE_H_
+
+#include <asm/arch-tegra/powergate.h>
+
+#endif /* _TEGRA30_POWERGATE_H_ */
--
2.0.4
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