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mesaflash/spi_boards.c
Jeff Epler 555269dd05 Use unsigned for some values 
.. this simplifies error checking, and fixes a diagnostic about
comparing signed and unsigned numbers.
2021-05-04 09:02:47 -05:00

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//
// Copyright (C) 2013-2014 Michael Geszkiewicz
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
#include <ctype.h>
#include <fcntl.h>
#include <linux/spi/spidev.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "types.h"
#include "eeprom.h"
#include "eeprom_local.h"
#include "spi_boards.h"
#include "common.h"
extern board_t boards[MAX_BOARDS];
extern int boards_count;
static bool canDo32 = true;
static int sd = -1;
struct spi_ioc_transfer settings;
static int spidev_set_lsb_first(int fd, u8 lsb_first) {
return ioctl(fd, SPI_IOC_WR_LSB_FIRST, &lsb_first);
}
static int spidev_set_mode(int fd, u8 mode) {
return ioctl(fd, SPI_IOC_WR_MODE, &mode);
}
static int spidev_set_max_speed_hz(int fd, u32 speed_hz) {
return ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed_hz);
}
static int spidev_set_bits_per_word(int fd, u8 bits) {
return ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits);
}
static u32 read_command(u16 addr, unsigned nelem) {
bool increment = true;
return (addr << 16) | SPILBP_CMD_READ | (increment ? SPILBP_ADDR_AUTO_INC : 0) | (nelem << 4);
}
static u32 write_command(u16 addr, unsigned nelem) {
bool increment = true;
return (addr << 16) | SPILBP_CMD_WRITE | (increment ? SPILBP_ADDR_AUTO_INC : 0) | (nelem << 4);
}
static int spi_board_open(board_t *board) {
eeprom_init(&(board->llio));
board->flash_id = read_flash_id(&(board->llio));
if (board->fallback_support == 1) {
eeprom_prepare_boot_block(board->flash_id);
board->flash_start_address = eeprom_calc_user_space(board->flash_id);
} else {
board->flash_start_address = 0;
}
return 0;
}
static int spi_board_close(board_t *board) {
(void)board;
return 0;
}
int spi_boards_init(board_access_t *access) {
settings.speed_hz = 20 * 1000 * 1000;
settings.bits_per_word = 32;
sd = open(access->dev_addr, O_RDWR);
if(sd == -1) {
perror("open");
return -1;
}
spidev_set_lsb_first(sd, false);
spidev_set_mode(sd, 0);
if (spidev_set_bits_per_word(sd, settings.bits_per_word) < 0)
{
fprintf(stderr,"unable to set bpw32, fallback to bpw8\n");
canDo32 = false;
settings.bits_per_word = 8;
spidev_set_bits_per_word(sd, settings.bits_per_word);
}
spidev_set_max_speed_hz(sd, settings.speed_hz);
return 0;
}
void spi_boards_cleanup(board_access_t *access) {
(void)access;
if(sd != -1) close(sd);
}
void reorderBuffer(char *pBuf, int numInts)
{
int lcv;
for (lcv = 0; lcv < numInts; lcv++)
{
pBuf[0] ^= pBuf[3];
pBuf[3] ^= pBuf[0];
pBuf[0] ^= pBuf[3];
pBuf[1] ^= pBuf[2];
pBuf[2] ^= pBuf[1];
pBuf[1] ^= pBuf[2];
pBuf += 4;
}
}
int spi_read(llio_t *self, u32 addr, void *buffer, int size) {
(void)self;
if(size % 4 != 0) return -1;
int numInts = 1+size/4;
u32 trxbuf[numInts];
trxbuf[0] = read_command(addr, size/4);
memset(trxbuf+1, 0, size);
struct spi_ioc_transfer t;
t = settings;
t.tx_buf = t.rx_buf = (uint64_t)(intptr_t)trxbuf;
t.len = sizeof(trxbuf);
if (!canDo32)
{
reorderBuffer((char *) trxbuf, 1);
}
int r = ioctl(sd, SPI_IOC_MESSAGE(1), &t);
if(r < 0) return r;
if (!canDo32)
{
reorderBuffer((char *) trxbuf, numInts);
}
memcpy(buffer, trxbuf+1, size);
return 0;
}
int spi_write(llio_t *self, u32 addr, void *buffer, int size) {
(void)self;
if(size % 4 != 0) return -1;
int numInts = 1+size/4;
u32 txbuf[numInts];
txbuf[0] = write_command(addr, size/4);
memcpy(txbuf + 1, buffer, size);
struct spi_ioc_transfer t;
t = settings;
t.tx_buf = (uint64_t)(intptr_t)txbuf;
t.len = sizeof(txbuf);
if (!canDo32)
{
reorderBuffer((char *) txbuf, numInts);
}
int r = ioctl(sd, SPI_IOC_MESSAGE(1), &t);
if(r <= 0) return r;
return 0;
}
static int spi_board_reload(llio_t *self, int fallback_flag) {
board_t *board = self->board;
int i;
u32 boot_addr, cookie;
spi_read(&(board->llio), HM2_ICAP_REG, &cookie, sizeof(u32));
if (cookie != HM2_ICAP_COOKIE) {
printf("ERROR: Active firmware too old to support --reload\n");
return -1;
}
if (fallback_flag == 1) {
boot_addr = 0x10000;
} else {
boot_addr = 0x0;
}
boot_addr |= 0x0B000000; // plus read command in high byte
u32 data[14] = {
0xFFFF, // dummy
0xFFFF, // dummy
0xAA99, // sync
0x5566, // sync
0x3261, // load low flash start address
boot_addr & 0xFFFF, // start addr
0x3281, // load high start address + read command
boot_addr >> 16, // start addr (plus read command in high byte)
0x30A1, // load command register
0x000E, // IPROG command
0x2000, // NOP
0x2000, // NOP
0x2000, // NOP
0x2000 // NOP
};
for (i = 0; i < 14; i++) {
spi_write(&(board->llio), HM2_ICAP_REG, &data[i], sizeof(u32));
usleep(1000);
}
printf("Waiting for FPGA configuration...");
sleep(2);
printf("OK\n");
return 0;
}
void spi_boards_scan(board_access_t *access) {
u32 buf[4];
u32 cookie[] = {0x55aacafe, 0x54534f48, 0x32544f4d};
board_t *board = &boards[boards_count];
board_init_struct(board);
if (spi_read(&(board->llio), HM2_COOKIE_REG, &buf, sizeof(buf)) < 0) {
return;
}
if(memcmp(buf, cookie, sizeof(cookie))) {
fprintf(stderr, "Unexpected cookie at %04x..%04zx:\n%08x %08x %08x\n",
HM2_COOKIE_REG, HM2_COOKIE_REG + sizeof(buf),
buf[0], buf[1], buf[2]);
return;
}
char ident[8];
if(spi_read(&(board->llio), buf[3] + 0xc, &ident, sizeof(ident)) < 0) return;
if(!memcmp(ident, "MESA7I90", 8)) {
board_t *board = &boards[boards_count];
board->type = BOARD_SPI;
strcpy(board->dev_addr, access->dev_addr);
strcpy(board->llio.board_name, "7I90");
board->llio.num_ioport_connectors = 3;
board->llio.pins_per_connector = 24;
board->llio.ioport_connector_name[0] = "P1";
board->llio.ioport_connector_name[1] = "P2";
board->llio.ioport_connector_name[2] = "P3";
board->llio.num_leds = 2;
board->llio.verbose = access->verbose;
board->llio.write = spi_write;
board->llio.read = spi_read;
board->llio.write_flash = local_write_flash;
board->llio.verify_flash = local_verify_flash;
board->llio.reload = &spi_board_reload;
board->llio.fpga_part_number = "6slx9tqg144";
board->open = spi_board_open;
board->close = spi_board_close;
board->print_info = spi_print_info;
board->flash = BOARD_FLASH_HM2;
board->fallback_support = 1;
boards_count ++;
} else if(!memcmp(ident, "MESA7C80", 8)) {
board_t *board = &boards[boards_count];
board->type = BOARD_SPI;
strcpy(board->dev_addr, access->dev_addr);
strcpy(board->llio.board_name, "7C80");
board->llio.num_ioport_connectors = 2;
board->llio.pins_per_connector = 27;
board->llio.ioport_connector_name[0] = "StepGens+Misc";
board->llio.ioport_connector_name[1] = "Outputs+P1";
board->llio.bob_hint[0] = BOB_7C80_0;
board->llio.bob_hint[1] = BOB_7C80_1;
board->llio.num_leds = 4;
board->llio.verbose = access->verbose;
board->llio.write = spi_write;
board->llio.read = spi_read;
board->llio.write_flash = local_write_flash;
board->llio.verify_flash = local_verify_flash;
board->llio.reload = &spi_board_reload;
board->llio.fpga_part_number = "6slx9tqg144";
board->open = spi_board_open;
board->close = spi_board_close;
board->print_info = spi_print_info;
board->flash = BOARD_FLASH_HM2;
board->fallback_support = 1;
boards_count ++;
} else if(!memcmp(ident, "MESA7C81", 8)) {
board_t *board = &boards[boards_count];
board->type = BOARD_SPI;
strcpy(board->dev_addr, access->dev_addr);
strcpy(board->llio.board_name, "7C81");
board->llio.num_ioport_connectors = 3;
board->llio.pins_per_connector = 19;
board->llio.ioport_connector_name[0] = "P1+Serial";
board->llio.ioport_connector_name[1] = "P2+Serial";
board->llio.ioport_connector_name[2] = "P7+Serial";
board->llio.bob_hint[0] = BOB_7C81_0;
board->llio.bob_hint[1] = BOB_7C81_1;
board->llio.bob_hint[2] = BOB_7C81_2;
board->llio.num_leds = 4;
board->llio.verbose = access->verbose;
board->llio.write = spi_write;
board->llio.read = spi_read;
board->llio.write_flash = local_write_flash;
board->llio.verify_flash = local_verify_flash;
board->llio.reload = &spi_board_reload;
board->llio.fpga_part_number = "6slx9tqg144";
board->open = spi_board_open;
board->close = spi_board_close;
board->print_info = spi_print_info;
board->flash = BOARD_FLASH_HM2;
board->fallback_support = 1;
boards_count ++;
} else {
for(size_t i=0; i<sizeof(ident); i++)
if(!isprint(ident[i])) ident[i] = '?';
fprintf(stderr, "Unknown board: %.8s\n", ident);
}
}
void spi_print_info(board_t *board) {
(void)board;
}
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