From bb3b2cfeb206f5b10b859e134651b54120e3f530 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 30 Jun 2026 18:05:56 +0100 Subject: ARM: 9480/1: entry: expand comment in __switch_to As per discussion between the developers in the mail thread linked, expand the comment in __switch_to so that readers of the code understand what is going on. Suggested-by: Mark Rutland Acked-by: Mark Rutland Signed-off-by: Linus Walleij > Signed-off-by: Russell King --- include/acpi/pcc.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 include/acpi/pcc.h (limited to 'include/acpi/pcc.h') diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h new file mode 100644 index 000000000..840bfc95b --- /dev/null +++ b/include/acpi/pcc.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * PCC (Platform Communications Channel) methods + */ + +#ifndef _PCC_H +#define _PCC_H + +#include +#include + +struct pcc_mbox_chan { + struct mbox_chan *mchan; + u64 shmem_base_addr; + void __iomem *shmem; + u64 shmem_size; + u32 latency; + u32 max_access_rate; + u16 min_turnaround_time; +}; + +/* Generic Communications Channel Shared Memory Region */ +#define PCC_SIGNATURE 0x50434300 +/* Generic Communications Channel Command Field */ +#define PCC_CMD_GENERATE_DB_INTR BIT(15) +/* Generic Communications Channel Status Field */ +#define PCC_STATUS_CMD_COMPLETE BIT(0) +#define PCC_STATUS_SCI_DOORBELL BIT(1) +#define PCC_STATUS_ERROR BIT(2) +#define PCC_STATUS_PLATFORM_NOTIFY BIT(3) +/* Initiator Responder Communications Channel Flags */ +#define PCC_CMD_COMPLETION_NOTIFY BIT(0) + +#define MAX_PCC_SUBSPACES 256 + +#ifdef CONFIG_PCC +extern struct pcc_mbox_chan * +pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id); +extern void pcc_mbox_free_channel(struct pcc_mbox_chan *chan); +#else +static inline struct pcc_mbox_chan * +pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id) +{ + return ERR_PTR(-ENODEV); +} +static inline void pcc_mbox_free_channel(struct pcc_mbox_chan *chan) { } +#endif + +#endif /* _PCC_H */ -- cgit v1.3.1