[U-Boot] [PATCH 11/23] ARM: tegra: Implement powergate support

Thierry Reding
2014-08-18T07:16:24Z

From: Thierry Reding <treding@nvidia.com>

Implement the powergate API that allows various power partitions to be
power up and down.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
arch/arm/cpu/tegra-common/Makefile | 1 +
arch/arm/cpu/tegra-common/powergate.c | 80 ++++++++++++++++++++++++++
arch/arm/include/asm/arch-tegra/powergate.h | 27 +++++++++
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, 132 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..2097bbcde365
--- /dev/null
+++ b/arch/arm/cpu/tegra-common/powergate.c
@@ -0,0 +1,80 @@
+#include <common.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 PWRGATE_STATUS 0x38
+
+static int tegra_powergate_set(enum tegra_powergate id, bool state)
+{
+ unsigned long value;
+ bool old_state;
+
+ value = readl(NV_PA_PMC_BASE + PWRGATE_STATUS);
+ old_state = value & (1 << id);
+
+ if (state == old_state)
+ return 0;
+
+ writel(PWRGATE_TOGGLE_START | id, NV_PA_PMC_BASE + PWRGATE_TOGGLE);
+
+ return 0;
+}
+
+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;
+
+ 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 + 0x34);
+
+ 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..53bed37d42c1
--- /dev/null
+++ b/arch/arm/include/asm/arch-tegra/powergate.h
@@ -0,0 +1,27 @@
+#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,
+};
+
+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