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 --- 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_ */