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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/>.
*/
#include "spi_flash_private.h"
//#include <stdlib.h>
#include <nonstdio.h>
uint32_t
spi_flash_rdsr(void)
{
return spif_transact(SPI_TXRX, SPI_SS_FLASH, RDSR_CMD << 8, 16, FLAGS) & 0xff;
}
static void
spi_flash_write_enable(void)
{
// spif_transact(SPI_TXONLY, SPI_SS_FLASH, (WRSR_CMD << 8) | 0x00, 16, FLAGS); //disable write protection bits
spif_transact(SPI_TXONLY, SPI_SS_FLASH, WREN_CMD, 8, FLAGS);
}
bool
spi_flash_done_p(void)
{
return (spi_flash_rdsr() & SR_WIP) == 0;
}
void
spi_flash_wait(void)
{
while (!spi_flash_done_p())
;
}
void
spi_flash_erase_sector_start(uint32_t flash_addr)
{
//uprintf(UART_DEBUG, "spi_flash_erase_sector_start: addr = 0x%x\n", flash_addr);
spi_flash_wait();
spi_flash_write_enable();
spif_transact(SPI_TXONLY, SPI_SS_FLASH,
(SE_CMD << 24) | (flash_addr & 0x00ffffff),
32, FLAGS);
}
bool
spi_flash_page_program_start(uint32_t flash_addr, size_t nbytes, const void *buf)
{
if (nbytes == 0 || nbytes > SPI_FLASH_PAGE_SIZE)
return false;
uint32_t local_buf[SPI_FLASH_PAGE_SIZE / sizeof(uint32_t)];
memset(local_buf, 0xff, sizeof(local_buf)); // init to 0xff (nops when programming)
memcpy(local_buf, buf, nbytes);
spi_flash_wait();
spi_flash_write_enable();
/*
* We explicitly control the slave select here (/S), so that we can
* do the entire write operation as a single transaction from
* device's point of view. (The most our SPI peripheral can transfer
* in a single shot is 16 bytes.)
*/
spif_wait();
spif_regs->ss = 0;
spif_regs->ctrl = FLAGS; // ASS is now clear and no chip select is enabled.
/* write PP_CMD, ADDR2, ADDR1, ADDR0 */
spif_regs->txrx0 = (PP_CMD << 24) | (flash_addr & 0x00ffffff);
spif_regs->ss = SPI_SS_FLASH; // assert chip select
spif_regs->ctrl = FLAGS | LEN(4 * 8);
spif_regs->ctrl = FLAGS | LEN(4 * 8) | SPI_CTRL_GO_BSY;
spif_wait();
/* send 256 bytes total, 16 at a time */
for (size_t i = 0; i < 16; i++){
spif_regs->txrx3 = local_buf[i * 4 + 0];
spif_regs->txrx2 = local_buf[i * 4 + 1];
spif_regs->txrx1 = local_buf[i * 4 + 2];
spif_regs->txrx0 = local_buf[i * 4 + 3];
spif_regs->ctrl = FLAGS | LEN(16 * 8); // xfer 16 bytes
spif_regs->ctrl = FLAGS | LEN(16 * 8) | SPI_CTRL_GO_BSY;
spif_wait();
}
spif_regs->ss = 0; // desassert chip select
return true;
}
void
spi_flash_erase(uint32_t flash_addr, size_t nbytes)
{
if (nbytes == 0)
return;
uint32_t first = round_down(flash_addr, spi_flash_sector_size());
uint32_t last = round_down(flash_addr + nbytes - 1, spi_flash_sector_size());
for (uint32_t s = first; s <= last; s += spi_flash_sector_size()){
spi_flash_erase_sector_start(s);
}
spi_flash_wait();
}
bool
spi_flash_program(uint32_t flash_addr, size_t nbytes, const void *buf)
{
//uprintf(UART_DEBUG, "\nspi_flash_program: addr = 0x%x, nbytes = %d\n", flash_addr, nbytes);
const unsigned char *p = (const unsigned char *) buf;
size_t n;
if (nbytes == 0)
return true;
uint32_t r = flash_addr % SPI_FLASH_PAGE_SIZE;
if (r){ /* do initial non-aligned page */
n = min(SPI_FLASH_PAGE_SIZE - r, nbytes);
spi_flash_page_program_start(flash_addr, n, p);
flash_addr += n;
p += n;
nbytes -= n;
}
while (nbytes > 0){
n = min(SPI_FLASH_PAGE_SIZE, nbytes);
spi_flash_page_program_start(flash_addr, n, p);
flash_addr += n;
p += n;
nbytes -= n;
}
spi_flash_wait();
return true;
}
void
spi_flash_async_erase_start(spi_flash_async_state_t *s,
uint32_t flash_addr, size_t nbytes)
{
if (nbytes == 0){
s->first = s->last = s->current = 0;
return;
}
uint32_t first = round_down(flash_addr, spi_flash_sector_size());
uint32_t last = round_down(flash_addr + nbytes - 1, spi_flash_sector_size());
s->first = first;
s->last = last;
s->current = first;
spi_flash_erase_sector_start(s->current);
}
bool
spi_flash_async_erase_poll(spi_flash_async_state_t *s)
{
if (!spi_flash_done_p())
return false;
//printf("%d/%d\n", s->current, s->last);
// The current sector erase has completed. See if we're finished or
// if there's more to do.
if (s->current == s->last) // we're done!
return true;
s->current += spi_flash_sector_size();
spi_flash_erase_sector_start(s->current);
return false;
}
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