From: Jules Maselbas <[email protected]> The Power Controller (pwr-ctrl) control cores reset and wake-up procedure.
Co-developed-by: Clement Leger <[email protected]> Signed-off-by: Clement Leger <[email protected]> Co-developed-by: Julian Vetter <[email protected]> Signed-off-by: Julian Vetter <[email protected]> Co-developed-by: Louis Morhet <[email protected]> Signed-off-by: Louis Morhet <[email protected]> Co-developed-by: Marius Gligor <[email protected]> Signed-off-by: Marius Gligor <[email protected]> Signed-off-by: Jules Maselbas <[email protected]> Signed-off-by: Yann Sionneau <[email protected]> --- Notes: V1 -> V2: new patch arch/kvx/include/asm/pwr_ctrl.h | 45 ++++++++++++++++ arch/kvx/platform/Makefile | 6 +++ arch/kvx/platform/pwr_ctrl.c | 91 +++++++++++++++++++++++++++++++++ 3 files changed, 142 insertions(+) create mode 100644 arch/kvx/include/asm/pwr_ctrl.h create mode 100644 arch/kvx/platform/Makefile create mode 100644 arch/kvx/platform/pwr_ctrl.c diff --git a/arch/kvx/include/asm/pwr_ctrl.h b/arch/kvx/include/asm/pwr_ctrl.h new file mode 100644 index 000000000000..25f403ba935a --- /dev/null +++ b/arch/kvx/include/asm/pwr_ctrl.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2017-2023 Kalray Inc. + * Author(s): Clement Leger + * Marius Gligor + */ + +#ifndef _ASM_KVX_PWR_CTRL_H +#define _ASM_KVX_PWR_CTRL_H + +#ifndef __ASSEMBLY__ + +int kvx_pwr_ctrl_probe(void); + +void kvx_pwr_ctrl_cpu_poweron(unsigned int cpu); + +#endif + +/* Power controller vector register definitions */ +#define KVX_PWR_CTRL_VEC_OFFSET 0x1000 +#define KVX_PWR_CTRL_VEC_WUP_SET_OFFSET 0x10 +#define KVX_PWR_CTRL_VEC_WUP_CLEAR_OFFSET 0x20 + +/* Power controller PE reset PC register definitions */ +#define KVX_PWR_CTRL_RESET_PC_OFFSET 0x2000 + +/* Power controller global register definitions */ +#define KVX_PWR_CTRL_GLOBAL_OFFSET 0x4040 + +#define KVX_PWR_CTRL_GLOBAL_SET_OFFSET 0x10 +#define KVX_PWR_CTRL_GLOBAL_SET_PE_EN_SHIFT 0x1 + +#define PWR_CTRL_WUP_SET_OFFSET \ + (KVX_PWR_CTRL_VEC_OFFSET + \ + KVX_PWR_CTRL_VEC_WUP_SET_OFFSET) + +#define PWR_CTRL_WUP_CLEAR_OFFSET \ + (KVX_PWR_CTRL_VEC_OFFSET + \ + KVX_PWR_CTRL_VEC_WUP_CLEAR_OFFSET) + +#define PWR_CTRL_GLOBAL_CONFIG_OFFSET \ + (KVX_PWR_CTRL_GLOBAL_OFFSET + \ + KVX_PWR_CTRL_GLOBAL_SET_OFFSET) + +#endif /* _ASM_KVX_PWR_CTRL_H */ diff --git a/arch/kvx/platform/Makefile b/arch/kvx/platform/Makefile new file mode 100644 index 000000000000..c7d0abb15c27 --- /dev/null +++ b/arch/kvx/platform/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Copyright (C) 2018-2023 Kalray Inc. +# + +obj-$(CONFIG_SMP) += pwr_ctrl.o diff --git a/arch/kvx/platform/pwr_ctrl.c b/arch/kvx/platform/pwr_ctrl.c new file mode 100644 index 000000000000..ee35d04845ae --- /dev/null +++ b/arch/kvx/platform/pwr_ctrl.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2017-2023 Kalray Inc. + * Author(s): Clement Leger + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> + +#include <asm/pwr_ctrl.h> +#include <asm/symbols.h> + +struct kvx_pwr_ctrl { + void __iomem *regs; +}; + +static struct kvx_pwr_ctrl kvx_pwr_controller; + +/** + * kvx_pwr_ctrl_cpu_poweron() - Wakeup a cpu + * @cpu: cpu to wakeup + */ +void kvx_pwr_ctrl_cpu_poweron(unsigned int cpu) +{ + /* Set PE boot address */ + writeq((unsigned long long)kvx_start, + kvx_pwr_controller.regs + KVX_PWR_CTRL_RESET_PC_OFFSET); + /* Wake up processor ! */ + writeq(1ULL << cpu, + kvx_pwr_controller.regs + PWR_CTRL_WUP_SET_OFFSET); + /* Then clear wakeup to allow processor to sleep */ + writeq(1ULL << cpu, + kvx_pwr_controller.regs + PWR_CTRL_WUP_CLEAR_OFFSET); +} + +static struct device_node * __init get_pwr_ctrl_node(void) +{ + const phandle *ph; + struct device_node *cpu; + struct device_node *node; + + cpu = of_get_cpu_node(raw_smp_processor_id(), NULL); + if (!cpu) { + pr_err("Failed to get CPU node\n"); + return NULL; + } + + ph = of_get_property(cpu, "power-controller", NULL); + if (!ph) { + pr_err("Failed to get power-controller phandle\n"); + return NULL; + } + + node = of_find_node_by_phandle(be32_to_cpup(ph)); + if (!node) { + pr_err("Failed to get power-controller node\n"); + return NULL; + } + + return node; +} + +int __init kvx_pwr_ctrl_probe(void) +{ + struct device_node *ctrl; + + ctrl = get_pwr_ctrl_node(); + if (!ctrl) { + pr_err("Failed to get power controller node\n"); + return -EINVAL; + } + + if (!of_device_is_compatible(ctrl, "kalray,kvx-pwr-ctrl")) { + pr_err("Failed to get power controller node\n"); + return -EINVAL; + } + + kvx_pwr_controller.regs = of_iomap(ctrl, 0); + if (!kvx_pwr_controller.regs) { + pr_err("Failed ioremap\n"); + return -EINVAL; + } + + return 0; +} -- 2.37.2 -- Linux-audit mailing list [email protected] https://listman.redhat.com/mailman/listinfo/linux-audit
