ARM: tegra: Implement powergate support

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

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/arch/arm/cpu/tegra-common/Makefile b/arch/arm/cpu/tegra-common/Makefile
index a18c318739fa2b6228b182fed24f507dfccfed10..c7603ee2bff68abfc5f1e851a1c52792b2b49260 100644 (file)
--- a/arch/arm/cpu/tegra-common/Makefile
+++ b/arch/arm/cpu/tegra-common/Makefile
@@ -13,5 +13,6 @@ obj-y += cache.o
 obj-y += clock.o
 obj-y += lowlevel_init.o
 obj-y += pinmux-common.o
+obj-y += powergate.o
 obj-$(CONFIG_DISPLAY_CPUINFO) += sys_info.o
 obj-$(CONFIG_TEGRA124) += vpr.o

diff --git a/arch/arm/cpu/tegra-common/powergate.c b/arch/arm/cpu/tegra-common/powergate.c
new file mode 100644 (file)
index 0000000..439cff3
--- /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 (file)
index 0000000..130b58b
--- /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 (file)
index 0000000..260ea80
--- /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 (file)
index 0000000..8a0cfba
--- /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 (file)
index 0000000..439d88b
--- /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 (file)
index 0000000..c70e44b
--- /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_ */