f48eaf01b2
Add a driver to support the special LDO access used by spring. This is a custom method in the cros_ec protocol - it does not use an I2C pass-through. There are two implementation choices: 1. Write a special LDO driver which can talk across the EC. Duplicate all the logic from TPS65090 for retrying when the LDO fails to come up. 2. Write a special I2C bus driver which pretends to be a TPS65090 and transfers reads and writes using the LDO message. Either is distasteful. The latter method is chosen since it results in less code duplication and a fairly simple (30-line) implementation of the core logic. The crosec 'ldo' subcommand could be removed (since i2c md/mw will work instead) but is retained as a convenience. Signed-off-by: Simon Glass <sjg@chromium.org>
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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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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* SPDX-License-Identifier: GPL-2.0+
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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 <fdtdec.h>
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#include <cros_ec_message.h>
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#include <asm/gpio.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 cros_ec_dev *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 cros_ec_dev *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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/**
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* Decode a flash region parameter
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*
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* @param argc Number of params remaining
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* @param argv List of remaining parameters
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* @return flash region (EC_FLASH_REGION_...) or -1 on error
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*/
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int cros_ec_decode_region(int argc, char * const argv[]);
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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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* 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 blob FDT blob to use
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* @param node Node offset 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(const void *blob, int node,
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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 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, struct i2c_msg *msg, int nmsgs);
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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 chip Chip address (7-bit I2C address)
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* @param addr Register address to read/write
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* @param alen Length of register address in bytes
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* @param buffer Buffer containing data to read/write
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* @param len Length of buffer
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* @param is_read 1 if this is a read, 0 if this is a write
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*/
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int cros_ec_i2c_xfer_old(struct cros_ec_dev *dev, uchar chip, uint addr,
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int alen, uchar *buffer, int len, int is_read);
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#endif
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