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| author | Linus Walleij <linusw@kernel.org> | 2026-06-30 18:05:56 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2026-08-05 16:48:11 +0100 |
| commit | bb3b2cfeb206f5b10b859e134651b54120e3f530 (patch) | |
| tree | 6717fcea088ba5c5f15002a48101fa2537135bf2 /include/acpi/pcc.h | |
| download | linux-stable-bb3b2cfeb206f5b10b859e134651b54120e3f530.tar.gz linux-stable-bb3b2cfeb206f5b10b859e134651b54120e3f530.zip | |
ARM: 9480/1: entry: expand comment in __switch_tografted
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 <mark.rutland@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'include/acpi/pcc.h')
| -rw-r--r-- | include/acpi/pcc.h | 49 |
1 files changed, 49 insertions, 0 deletions
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 <linux/mailbox_controller.h> +#include <linux/mailbox_client.h> + +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 */ |