mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
405 lines
12 KiB
C
405 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Chromium OS cros_ec driver
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*
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* Copyright (c) 2012 The Chromium OS Authors.
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*/
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#ifndef _CROS_EC_H
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#define _CROS_EC_H
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#include <linux/compiler.h>
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#include <ec_commands.h>
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#include <cros_ec_message.h>
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#include <asm/gpio.h>
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#include <dm/of_extra.h>
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/* Our configuration information */
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struct cros_ec_dev {
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struct udevice *dev; /* Transport device */
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struct gpio_desc ec_int; /* GPIO used as EC interrupt line */
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int protocol_version; /* Protocol version to use */
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int optimise_flash_write; /* Don't write erased flash blocks */
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/*
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* These two buffers will always be dword-aligned and include enough
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* space for up to 7 word-alignment bytes also, so we can ensure that
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* the body of the message is always dword-aligned (64-bit).
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*
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* We use this alignment to keep ARM and x86 happy. Probably word
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* alignment would be OK, there might be a small performance advantage
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* to using dword.
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*/
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uint8_t din[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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uint8_t dout[ALIGN(MSG_BYTES + sizeof(int64_t), sizeof(int64_t))]
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__aligned(sizeof(int64_t));
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};
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/*
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* Hard-code the number of columns we happen to know we have right now. It
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* would be more correct to call cros_ec_info() at startup and determine the
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* actual number of keyboard cols from there.
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*/
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#define CROS_EC_KEYSCAN_COLS 13
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/* Information returned by a key scan */
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struct mbkp_keyscan {
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uint8_t data[CROS_EC_KEYSCAN_COLS];
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};
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/* Holds information about the Chrome EC */
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struct fdt_cros_ec {
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struct fmap_entry flash; /* Address and size of EC flash */
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/*
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* Byte value of erased flash, or -1 if not known. It is normally
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* 0xff but some flash devices use 0 (e.g. STM32Lxxx)
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*/
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int flash_erase_value;
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struct fmap_entry region[EC_FLASH_REGION_COUNT];
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};
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/**
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* Read the ID of the CROS-EC device
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*
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* The ID is a string identifying the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param id Place to put the ID
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* @param maxlen Maximum length of the ID field
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_read_id(struct cros_ec_dev *dev, char *id, int maxlen);
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/**
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* Read a keyboard scan from the CROS-EC device
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*
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* Send a message requesting a keyboard scan and return the result
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*
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* @param dev CROS-EC device
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* @param scan Place to put the scan results
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_scan_keyboard(struct udevice *dev, struct mbkp_keyscan *scan);
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/**
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* Read which image is currently running on the CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param image Destination for image identifier
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_read_current_image(struct cros_ec_dev *dev,
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enum ec_current_image *image);
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/**
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* Read the hash of the CROS-EC device firmware.
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*
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* @param dev CROS-EC device
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* @param hash Destination for hash information
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_read_hash(struct cros_ec_dev *dev,
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struct ec_response_vboot_hash *hash);
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/**
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* Send a reboot command to the CROS-EC device.
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*
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* Note that some reboot commands (such as EC_REBOOT_COLD) also reboot the AP.
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*
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* @param dev CROS-EC device
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* @param cmd Reboot command
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* @param flags Flags for reboot command (EC_REBOOT_FLAG_*)
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_reboot(struct cros_ec_dev *dev, enum ec_reboot_cmd cmd,
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uint8_t flags);
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/**
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* Check if the CROS-EC device has an interrupt pending.
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*
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* Read the status of the external interrupt connected to the CROS-EC device.
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* If no external interrupt is configured, this always returns 1.
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*
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* @param dev CROS-EC device
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* @return 0 if no interrupt is pending
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*/
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int cros_ec_interrupt_pending(struct udevice *dev);
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enum {
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CROS_EC_OK,
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CROS_EC_ERR = 1,
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CROS_EC_ERR_FDT_DECODE,
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CROS_EC_ERR_CHECK_VERSION,
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CROS_EC_ERR_READ_ID,
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CROS_EC_ERR_DEV_INIT,
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};
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/**
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* Initialise the Chromium OS EC driver
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*
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* @param blob Device tree blob containing setup information
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* @param cros_ecp Returns pointer to the cros_ec device, or NULL if none
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* @return 0 if we got an cros_ec device and all is well (or no cros_ec is
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* expected), -ve if we should have an cros_ec device but failed to find
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* one, or init failed (-CROS_EC_ERR_...).
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*/
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int cros_ec_init(const void *blob, struct cros_ec_dev **cros_ecp);
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/**
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* Read information about the keyboard matrix
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*
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* @param dev CROS-EC device
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* @param info Place to put the info structure
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*/
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int cros_ec_info(struct cros_ec_dev *dev,
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struct ec_response_mkbp_info *info);
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/**
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* Read the host event flags
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*
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* @param dev CROS-EC device
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* @param events_ptr Destination for event flags. Not changed on error.
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_get_host_events(struct cros_ec_dev *dev, uint32_t *events_ptr);
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/**
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* Clear the specified host event flags
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*
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* @param dev CROS-EC device
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* @param events Event flags to clear
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_clear_host_events(struct cros_ec_dev *dev, uint32_t events);
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/**
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* Get/set flash protection
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*
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* @param dev CROS-EC device
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* @param set_mask Mask of flags to set; if 0, just retrieves existing
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* protection state without changing it.
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* @param set_flags New flag values; only bits in set_mask are applied;
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* ignored if set_mask=0.
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* @param prot Destination for updated protection state from EC.
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* @return 0 if ok, <0 on error
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*/
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int cros_ec_flash_protect(struct cros_ec_dev *dev,
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uint32_t set_mask, uint32_t set_flags,
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struct ec_response_flash_protect *resp);
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/**
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* Run internal tests on the cros_ec interface.
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*
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* @param dev CROS-EC device
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* @return 0 if ok, <0 if the test failed
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*/
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int cros_ec_test(struct cros_ec_dev *dev);
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/**
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* Update the EC RW copy.
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*
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* @param dev CROS-EC device
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* @param image the content to write
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* @param imafge_size content length
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* @return 0 if ok, <0 if the test failed
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*/
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int cros_ec_flash_update_rw(struct cros_ec_dev *dev,
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const uint8_t *image, int image_size);
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/**
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* Return a pointer to the board's CROS-EC device
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*
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* This should be implemented by board files.
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*
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* @return pointer to CROS-EC device, or NULL if none is available
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*/
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struct cros_ec_dev *board_get_cros_ec_dev(void);
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struct dm_cros_ec_ops {
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int (*check_version)(struct udevice *dev);
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int (*command)(struct udevice *dev, uint8_t cmd, int cmd_version,
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const uint8_t *dout, int dout_len,
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uint8_t **dinp, int din_len);
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int (*packet)(struct udevice *dev, int out_bytes, int in_bytes);
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};
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#define dm_cros_ec_get_ops(dev) \
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((struct dm_cros_ec_ops *)(dev)->driver->ops)
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int cros_ec_register(struct udevice *dev);
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/**
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* Dump a block of data for a command.
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*
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* @param name Name for data (e.g. 'in', 'out')
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* @param cmd Command number associated with data, or -1 for none
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* @param data Data block to dump
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* @param len Length of data block to dump
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*/
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void cros_ec_dump_data(const char *name, int cmd, const uint8_t *data, int len);
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/**
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* Calculate a simple 8-bit checksum of a data block
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*
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* @param data Data block to checksum
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* @param size Size of data block in bytes
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* @return checksum value (0 to 255)
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*/
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int cros_ec_calc_checksum(const uint8_t *data, int size);
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int cros_ec_flash_erase(struct cros_ec_dev *dev, uint32_t offset,
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uint32_t size);
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/**
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* Read data from the flash
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*
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* Read an arbitrary amount of data from the EC flash, by repeatedly reading
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to read for a particular region.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to read into
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* @param offset Offset within flash to read from
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* @param size Number of bytes to read
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_flash_read(struct cros_ec_dev *dev, uint8_t *data, uint32_t offset,
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uint32_t size);
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/**
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* Read back flash parameters
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*
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* This function reads back parameters of the flash as reported by the EC
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*
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* @param dev Pointer to device
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* @param info Pointer to output flash info struct
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*/
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int cros_ec_read_flashinfo(struct cros_ec_dev *dev,
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struct ec_response_flash_info *info);
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/**
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* Write data to the flash
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*
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* Write an arbitrary amount of data to the EC flash, by repeatedly writing
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* small blocks.
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*
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* The offset starts at 0. You can obtain the region information from
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* cros_ec_flash_offset() to find out where to write for a particular region.
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*
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* Attempting to write to the region where the EC is currently running from
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* will result in an error.
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*
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* @param dev CROS-EC device
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* @param data Pointer to data buffer to write
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* @param offset Offset within flash to write to.
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* @param size Number of bytes to write
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_flash_write(struct cros_ec_dev *dev, const uint8_t *data,
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uint32_t offset, uint32_t size);
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/**
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* Obtain position and size of a flash region
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*
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* @param dev CROS-EC device
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* @param region Flash region to query
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* @param offset Returns offset of flash region in EC flash
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* @param size Returns size of flash region
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_flash_offset(struct cros_ec_dev *dev, enum ec_flash_region region,
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uint32_t *offset, uint32_t *size);
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/**
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* Read/write VbNvContext from/to a CROS-EC device.
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*
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* @param dev CROS-EC device
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* @param block Buffer of VbNvContext to be read/write
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_read_vbnvcontext(struct cros_ec_dev *dev, uint8_t *block);
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int cros_ec_write_vbnvcontext(struct cros_ec_dev *dev, const uint8_t *block);
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/**
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* Read the version information for the EC images
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*
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* @param dev CROS-EC device
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* @param versionp This is set to point to the version information
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_read_version(struct cros_ec_dev *dev,
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struct ec_response_get_version **versionp);
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/**
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* Read the build information for the EC
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*
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* @param dev CROS-EC device
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* @param versionp This is set to point to the build string
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_read_build_info(struct cros_ec_dev *dev, char **strp);
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/**
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* Switch on/off a LDO / FET.
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*
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* @param dev CROS-EC device
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* @param index index of the LDO/FET to switch
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* @param state new state of the LDO/FET : EC_LDO_STATE_ON|OFF
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_set_ldo(struct udevice *dev, uint8_t index, uint8_t state);
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/**
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* Read back a LDO / FET current state.
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*
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* @param dev CROS-EC device
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* @param index index of the LDO/FET to switch
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* @param state current state of the LDO/FET : EC_LDO_STATE_ON|OFF
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_get_ldo(struct udevice *dev, uint8_t index, uint8_t *state);
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/**
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* Get access to the error reported when cros_ec_board_init() was called
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*
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* This permits delayed reporting of the EC error if it failed during
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* early init.
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*
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* @return error (0 if there was no error, -ve if there was an error)
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*/
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int cros_ec_get_error(void);
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/**
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* Returns information from the FDT about the Chrome EC flash
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*
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* @param dev Device to read from
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* @param config Structure to use to return information
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*/
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int cros_ec_decode_ec_flash(struct udevice *dev, struct fdt_cros_ec *config);
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/**
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* Check the current keyboard state, in case recovery mode is requested.
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* This function is for sandbox only.
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*
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* @param ec CROS-EC device
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*/
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void cros_ec_check_keyboard(struct cros_ec_dev *dev);
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struct i2c_msg;
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/*
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* Tunnel an I2C transfer to the EC
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*
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* @param dev CROS-EC device
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* @param port The remote port on EC to use
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* @param msg List of messages to transfer
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* @param nmsgs Number of messages to transfer
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*/
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int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
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int nmsgs);
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#endif
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