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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2019-2020 Linaro Ltd.
*/
#ifndef _IPA_MEM_H_
#define _IPA_MEM_H_
struct ipa;
struct ipa_mem_data;
/**
* DOC: IPA Local Memory
*
* The IPA has a block of shared memory, divided into regions used for
* specific purposes.
*
* The regions within the shared block are bounded by an offset (relative to
* the "ipa-shared" memory range) and size found in the IPA_SHARED_MEM_SIZE
* register.
*
* Each region is optionally preceded by one or more 32-bit "canary" values.
* These are meant to detect out-of-range writes (if they become corrupted).
* A given region (such as a filter or routing table) has the same number
* of canaries for all IPA hardware versions. Still, the number used is
* defined in the config data, allowing for generic handling of regions.
*
* The set of memory regions is defined in configuration data. They are
* subject to these constraints:
* - a zero offset and zero size represents and undefined region
* - a region's offset is defined to be *past* all "canary" values
* - offset must be large enough to account for all canaries
* - a region's size may be zero, but may still have canaries
* - all offsets must be 8-byte aligned
* - most sizes must be a multiple of 8
* - modem memory size must be a multiple of 4
* - the microcontroller ring offset must be a multiple of 1024
*/
/* The maximum allowed size for any memory region */
#define IPA_MEM_MAX (2 * PAGE_SIZE)
/* IPA-resident memory region ids */
enum ipa_mem_id {
IPA_MEM_UC_SHARED, /* 0 canaries */
IPA_MEM_UC_INFO, /* 0 canaries */
IPA_MEM_V4_FILTER_HASHED, /* 2 canaries */
IPA_MEM_V4_FILTER, /* 2 canaries */
IPA_MEM_V6_FILTER_HASHED, /* 2 canaries */
IPA_MEM_V6_FILTER, /* 2 canaries */
IPA_MEM_V4_ROUTE_HASHED, /* 2 canaries */
IPA_MEM_V4_ROUTE, /* 2 canaries */
IPA_MEM_V6_ROUTE_HASHED, /* 2 canaries */
IPA_MEM_V6_ROUTE, /* 2 canaries */
IPA_MEM_MODEM_HEADER, /* 2 canaries */
IPA_MEM_AP_HEADER, /* 0 canaries */
IPA_MEM_MODEM_PROC_CTX, /* 2 canaries */
IPA_MEM_AP_PROC_CTX, /* 0 canaries */
IPA_MEM_PDN_CONFIG, /* 2 canaries (IPA v4.0 and above) */
IPA_MEM_STATS_QUOTA, /* 2 canaries (IPA v4.0 and above) */
IPA_MEM_STATS_TETHERING, /* 0 canaries (IPA v4.0 and above) */
IPA_MEM_STATS_DROP, /* 0 canaries (IPA v4.0 and above) */
IPA_MEM_MODEM, /* 0 canaries */
IPA_MEM_UC_EVENT_RING, /* 1 canary */
IPA_MEM_COUNT, /* Number of regions (not an index) */
};
/**
* struct ipa_mem - IPA local memory region description
* @offset: offset in IPA memory space to base of the region
* @size: size in bytes base of the region
* @canary_count # 32-bit "canary" values that precede region
*/
struct ipa_mem {
u32 offset;
u16 size;
u16 canary_count;
};
int ipa_mem_config(struct ipa *ipa);
void ipa_mem_deconfig(struct ipa *ipa);
int ipa_mem_setup(struct ipa *ipa);
void ipa_mem_teardown(struct ipa *ipa);
int ipa_mem_zero_modem(struct ipa *ipa);
int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data);
void ipa_mem_exit(struct ipa *ipa);
#endif /* _IPA_MEM_H_ */
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