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/* -*- c -*- */
/*
* Copyright 2009 Free Software Foundation, Inc.
* Copyright 2009 Ettus Research LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_SPI_FLASH_H
#define INCLUDED_SPI_FLASH_H
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#define SPI_FLASH_PAGE_SIZE 256
#define SPI_SS_FLASH 1
uint32_t spi_flash_rdid(void); /* Read ID */
uint32_t spi_flash_rdsr(void); /* Read Status Register */
size_t spi_flash_log2_sector_size(void) __attribute__((pure)); /* either 16 or 18 */
size_t spi_flash_log2_memory_size(void);
static inline size_t
spi_flash_sector_size(void)
{
return ((size_t) 1) << spi_flash_log2_sector_size();
}
static inline size_t
spi_flash_memory_size(void)
{
return ((size_t) 1) << spi_flash_log2_memory_size();
}
void spi_flash_read(uint32_t flash_addr, size_t nbytes, void *buf);
/*
* Erase all sectors that fall within the interval [flash_addr, flash_addr + nbytes).
* Erasing sets the memory to ones.
*/
void spi_flash_erase(uint32_t flash_addr, size_t nbytes);
/*
* Program the flash.
* The area must have been erased prior to programming.
*/
bool spi_flash_program(uint32_t flash_addr, size_t nbytes, const void *buf);
/*
* --- asynchronous routines ---
*/
/*
* Is the erasing or programming done?
*/
bool spi_flash_done_p(void);
/*
* Wait for erasing or programming to complete
*/
void spi_flash_wait(void);
/*
* Start the erase process on a single sector.
* (It takes between 1 and 3 seconds to erase a 64KB sector)
*/
void spi_flash_erase_sector_start(uint32_t flash_addr);
/*
* Start the programming process within a single page.
* nbytes must be between 1 and 256.
* (It takes between 1.4 and 5 ms to program a page -> 640 ms for 64KB)
*/
bool spi_flash_page_program_start(uint32_t flash_addr, size_t nbytes, const void *buf);
/*
* --- high-level async erase ---
*/
typedef struct {
uint32_t first;
uint32_t last;
uint32_t current;
} spi_flash_async_state_t;
/*
* Start to erase all sectors that fall within the interval [flash_addr, flash_addr + nbytes).
* Erasing sets the memory to ones.
*
* Initializes s and begins the process. Call spi_flash_async_erase_poll
* to test for completion and advance state machine.
*/
void spi_flash_async_erase_start(spi_flash_async_state_t *s,
uint32_t flash_addr, size_t nbytes);
/*
* Poll for aysnc flash erase completion.
* Returns true when the erase has completed.
* (This should be called at something >= 4 Hz. It takes 1 to 3 seconds to
* erase each 64KB sector).
*/
bool spi_flash_async_erase_poll(spi_flash_async_state_t *s);
#endif /* INCLUDED_SPI_FLASH_H */
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