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u-boot/arch/arm/mach-bcm283x/include/mach/mbox.h
Vincent Fazio 85bdd28d2b mmc: bcm2835-host: let firmware manage the clock divisor 
Newer firmware can manage the SDCDIV clock divisor register, allowing
the divisor to scale with the core as necessary.

Leverage this ability if the firmware supports it.

Adapted from the following raspberrypi Linux kernel commit:

  bcm2835-sdhost: Firmware manages the clock divisor
  08532d242d

Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
2023-03-24 14:43:20 +00:00

548 lines
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2012,2015 Stephen Warren
*/
#ifndef _BCM2835_MBOX_H
#define _BCM2835_MBOX_H
#include <linux/compiler.h>
#include <asm/arch/base.h>
/*
* The BCM2835 SoC contains (at least) two CPUs; the VideoCore (a/k/a "GPU")
* and the ARM CPU. The ARM CPU is often thought of as the main CPU.
* However, the VideoCore actually controls the initial SoC boot, and hides
* much of the hardware behind a protocol. This protocol is transported
* using the SoC's mailbox hardware module.
*
* The mailbox hardware supports passing 32-bit values back and forth.
* Presumably by software convention of the firmware, the bottom 4 bits of the
* value are used to indicate a logical channel, and the upper 28 bits are the
* actual payload. Various channels exist using these simple raw messages. See
* https://github.com/raspberrypi/firmware/wiki/Mailboxes for a list. As an
* example, the messages on the power management channel are a bitmask of
* devices whose power should be enabled.
*
* The property mailbox channel passes messages that contain the (16-byte
* aligned) ARM physical address of a memory buffer. This buffer is passed to
* the VC for processing, is modified in-place by the VC, and the address then
* passed back to the ARM CPU as the response mailbox message to indicate
* request completion. The buffers have a generic and extensible format; each
* buffer contains a standard header, a list of "tags", and a terminating zero
* entry. Each tag contains an ID indicating its type, and length fields for
* generic parsing. With some limitations, an arbitrary set of tags may be
* combined together into a single message buffer. This file defines structs
* representing the header and many individual tag layouts and IDs.
*/
/* Raw mailbox HW */
#define BCM2835_MBOX_PHYSADDR ({ BUG_ON(!rpi_bcm283x_base); \
rpi_bcm283x_base + 0x0000b880; })
struct bcm2835_mbox_regs {
u32 read;
u32 rsvd0[5];
u32 mail0_status;
u32 mail0_config;
u32 write;
u32 rsvd1[5];
u32 mail1_status;
u32 mail1_config;
};
#define BCM2835_MBOX_STATUS_WR_FULL 0x80000000
#define BCM2835_MBOX_STATUS_RD_EMPTY 0x40000000
/* Lower 4-bits are channel ID */
#define BCM2835_CHAN_MASK 0xf
#define BCM2835_MBOX_PACK(chan, data) (((data) & (~BCM2835_CHAN_MASK)) | \
(chan & BCM2835_CHAN_MASK))
#define BCM2835_MBOX_UNPACK_CHAN(val) ((val) & BCM2835_CHAN_MASK)
#define BCM2835_MBOX_UNPACK_DATA(val) ((val) & (~BCM2835_CHAN_MASK))
/* Property mailbox buffer structures */
#define BCM2835_MBOX_PROP_CHAN 8
/* All message buffers must start with this header */
struct bcm2835_mbox_hdr {
u32 buf_size;
u32 code;
};
#define BCM2835_MBOX_REQ_CODE 0
#define BCM2835_MBOX_RESP_CODE_SUCCESS 0x80000000
#define BCM2835_MBOX_INIT_HDR(_m_) { \
memset((_m_), 0, sizeof(*(_m_))); \
(_m_)->hdr.buf_size = sizeof(*(_m_)); \
(_m_)->hdr.code = 0; \
(_m_)->end_tag = 0; \
}
/*
* A message buffer contains a list of tags. Each tag must also start with
* a standardized header.
*/
struct bcm2835_mbox_tag_hdr {
u32 tag;
u32 val_buf_size;
u32 val_len;
};
#define BCM2835_MBOX_INIT_TAG(_t_, _id_) { \
(_t_)->tag_hdr.tag = BCM2835_MBOX_TAG_##_id_; \
(_t_)->tag_hdr.val_buf_size = sizeof((_t_)->body); \
(_t_)->tag_hdr.val_len = sizeof((_t_)->body.req); \
}
#define BCM2835_MBOX_INIT_TAG_NO_REQ(_t_, _id_) { \
(_t_)->tag_hdr.tag = BCM2835_MBOX_TAG_##_id_; \
(_t_)->tag_hdr.val_buf_size = sizeof((_t_)->body); \
(_t_)->tag_hdr.val_len = 0; \
}
/* When responding, the VC sets this bit in val_len to indicate a response */
#define BCM2835_MBOX_TAG_VAL_LEN_RESPONSE 0x80000000
/*
* Below we define the ID and struct for many possible tags. This header only
* defines individual tag structs, not entire message structs, since in
* general an arbitrary set of tags may be combined into a single message.
* Clients of the mbox API are expected to define their own overall message
* structures by combining the header, a set of tags, and a terminating
* entry. For example,
*
* struct msg {
* struct bcm2835_mbox_hdr hdr;
* struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
* ... perhaps other tags here ...
* u32 end_tag;
* };
*/
#define BCM2835_MBOX_TAG_GET_BOARD_REV 0x00010002
struct bcm2835_mbox_tag_get_board_rev {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u32 rev;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_MAC_ADDRESS 0x00010003
struct bcm2835_mbox_tag_get_mac_address {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u8 mac[6];
u8 pad[2];
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_BOARD_SERIAL 0x00010004
struct bcm2835_mbox_tag_get_board_serial {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct __packed {
u64 serial;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_ARM_MEMORY 0x00010005
struct bcm2835_mbox_tag_get_arm_mem {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u32 mem_base;
u32 mem_size;
} resp;
} body;
};
#define BCM2835_MBOX_POWER_DEVID_SDHCI 0
#define BCM2835_MBOX_POWER_DEVID_UART0 1
#define BCM2835_MBOX_POWER_DEVID_UART1 2
#define BCM2835_MBOX_POWER_DEVID_USB_HCD 3
#define BCM2835_MBOX_POWER_DEVID_I2C0 4
#define BCM2835_MBOX_POWER_DEVID_I2C1 5
#define BCM2835_MBOX_POWER_DEVID_I2C2 6
#define BCM2835_MBOX_POWER_DEVID_SPI 7
#define BCM2835_MBOX_POWER_DEVID_CCP2TX 8
#define BCM2835_MBOX_POWER_STATE_RESP_ON (1 << 0)
/* Device doesn't exist */
#define BCM2835_MBOX_POWER_STATE_RESP_NODEV (1 << 1)
#define BCM2835_MBOX_TAG_GET_POWER_STATE 0x00020001
struct bcm2835_mbox_tag_get_power_state {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 device_id;
} req;
struct {
u32 device_id;
u32 state;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_SET_POWER_STATE 0x00028001
#define BCM2835_MBOX_SET_POWER_STATE_REQ_ON (1 << 0)
#define BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT (1 << 1)
struct bcm2835_mbox_tag_set_power_state {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 device_id;
u32 state;
} req;
struct {
u32 device_id;
u32 state;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_CLOCK_RATE 0x00030002
#define BCM2835_MBOX_TAG_GET_MAX_CLOCK_RATE 0x00030004
#define BCM2835_MBOX_TAG_GET_MIN_CLOCK_RATE 0x00030007
#define BCM2835_MBOX_CLOCK_ID_EMMC 1
#define BCM2835_MBOX_CLOCK_ID_UART 2
#define BCM2835_MBOX_CLOCK_ID_ARM 3
#define BCM2835_MBOX_CLOCK_ID_CORE 4
#define BCM2835_MBOX_CLOCK_ID_V3D 5
#define BCM2835_MBOX_CLOCK_ID_H264 6
#define BCM2835_MBOX_CLOCK_ID_ISP 7
#define BCM2835_MBOX_CLOCK_ID_SDRAM 8
#define BCM2835_MBOX_CLOCK_ID_PIXEL 9
#define BCM2835_MBOX_CLOCK_ID_PWM 10
#define BCM2835_MBOX_CLOCK_ID_EMMC2 12
struct bcm2835_mbox_tag_get_clock_rate {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 clock_id;
} req;
struct {
u32 clock_id;
u32 rate_hz;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_SET_SDHOST_CLOCK 0x00038042
struct bcm2835_mbox_tag_set_sdhost_clock {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 rate_hz;
} req;
struct {
u32 rate_hz;
u32 rate_1;
u32 rate_2;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_ALLOCATE_BUFFER 0x00040001
struct bcm2835_mbox_tag_allocate_buffer {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 alignment;
} req;
struct {
u32 fb_address;
u32 fb_size;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_RELEASE_BUFFER 0x00048001
struct bcm2835_mbox_tag_release_buffer {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
} resp;
} body;
};
#define BCM2835_MBOX_TAG_BLANK_SCREEN 0x00040002
struct bcm2835_mbox_tag_blank_screen {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
/* bit 0 means on, other bots reserved */
u32 state;
} req;
struct {
u32 state;
} resp;
} body;
};
/* Physical means output signal */
#define BCM2835_MBOX_TAG_GET_PHYSICAL_W_H 0x00040003
#define BCM2835_MBOX_TAG_TEST_PHYSICAL_W_H 0x00044003
#define BCM2835_MBOX_TAG_SET_PHYSICAL_W_H 0x00048003
struct bcm2835_mbox_tag_physical_w_h {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 width;
u32 height;
} req;
struct {
u32 width;
u32 height;
} resp;
} body;
};
/* Virtual means display buffer */
#define BCM2835_MBOX_TAG_GET_VIRTUAL_W_H 0x00040004
#define BCM2835_MBOX_TAG_TEST_VIRTUAL_W_H 0x00044004
#define BCM2835_MBOX_TAG_SET_VIRTUAL_W_H 0x00048004
struct bcm2835_mbox_tag_virtual_w_h {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 width;
u32 height;
} req;
struct {
u32 width;
u32 height;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_DEPTH 0x00040005
#define BCM2835_MBOX_TAG_TEST_DEPTH 0x00044005
#define BCM2835_MBOX_TAG_SET_DEPTH 0x00048005
struct bcm2835_mbox_tag_depth {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 bpp;
} req;
struct {
u32 bpp;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_PIXEL_ORDER 0x00040006
#define BCM2835_MBOX_TAG_TEST_PIXEL_ORDER 0x00044006
#define BCM2835_MBOX_TAG_SET_PIXEL_ORDER 0x00048006
#define BCM2835_MBOX_PIXEL_ORDER_BGR 0
#define BCM2835_MBOX_PIXEL_ORDER_RGB 1
struct bcm2835_mbox_tag_pixel_order {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 order;
} req;
struct {
u32 order;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_ALPHA_MODE 0x00040007
#define BCM2835_MBOX_TAG_TEST_ALPHA_MODE 0x00044007
#define BCM2835_MBOX_TAG_SET_ALPHA_MODE 0x00048007
#define BCM2835_MBOX_ALPHA_MODE_0_OPAQUE 0
#define BCM2835_MBOX_ALPHA_MODE_0_TRANSPARENT 1
#define BCM2835_MBOX_ALPHA_MODE_IGNORED 2
struct bcm2835_mbox_tag_alpha_mode {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 alpha;
} req;
struct {
u32 alpha;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_PITCH 0x00040008
struct bcm2835_mbox_tag_pitch {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u32 pitch;
} resp;
} body;
};
/* Offset of display window within buffer */
#define BCM2835_MBOX_TAG_GET_VIRTUAL_OFFSET 0x00040009
#define BCM2835_MBOX_TAG_TEST_VIRTUAL_OFFSET 0x00044009
#define BCM2835_MBOX_TAG_SET_VIRTUAL_OFFSET 0x00048009
struct bcm2835_mbox_tag_virtual_offset {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 x;
u32 y;
} req;
struct {
u32 x;
u32 y;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_OVERSCAN 0x0004000a
#define BCM2835_MBOX_TAG_TEST_OVERSCAN 0x0004400a
#define BCM2835_MBOX_TAG_SET_OVERSCAN 0x0004800a
struct bcm2835_mbox_tag_overscan {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
/* req not used for get */
struct {
u32 top;
u32 bottom;
u32 left;
u32 right;
} req;
struct {
u32 top;
u32 bottom;
u32 left;
u32 right;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_GET_PALETTE 0x0004000b
struct bcm2835_mbox_tag_get_palette {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
} req;
struct {
u32 data[1024];
} resp;
} body;
};
#define BCM2835_MBOX_TAG_TEST_PALETTE 0x0004400b
struct bcm2835_mbox_tag_test_palette {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 offset;
u32 num_entries;
u32 data[256];
} req;
struct {
u32 is_invalid;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_SET_PALETTE 0x0004800b
struct bcm2835_mbox_tag_set_palette {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 offset;
u32 num_entries;
u32 data[256];
} req;
struct {
u32 is_invalid;
} resp;
} body;
};
#define BCM2835_MBOX_TAG_NOTIFY_XHCI_RESET 0x00030058
struct bcm2835_mbox_tag_pci_dev_addr {
struct bcm2835_mbox_tag_hdr tag_hdr;
union {
struct {
u32 dev_addr;
} req;
struct {
} resp;
} body;
};
/*
* Pass a raw u32 message to the VC, and receive a raw u32 back.
*
* Returns 0 for success, any other value for error.
*/
int bcm2835_mbox_call_raw(u32 chan, u32 send, u32 *recv);
/*
* Pass a complete property-style buffer to the VC, and wait until it has
* been processed.
*
* This function expects a pointer to the mbox_hdr structure in an attempt
* to ensure some degree of type safety. However, some number of tags and
* a termination value are expected to immediately follow the header in
* memory, as required by the property protocol.
*
* Each struct bcm2835_mbox_hdr passed must be allocated with
* ALLOC_CACHE_ALIGN_BUFFER(x, y, z) to ensure proper cache flush/invalidate.
*
* Returns 0 for success, any other value for error.
*/
int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer);
#endif
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