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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2012
* Valentin Lontgchamp, Keymile AG, valentin.longchamp@keymile.com
*/
#include <common.h>
#include <i2c.h>
#include <linux/delay.h>
#include <linux/errno.h>
/* GPIO Pin from kirkwood connected to PROGRAM_B pin of the xilinx FPGA */
#define KM_XLX_PROGRAM_B_PIN 39
#define BOCO_ADDR 0x10
#define ID_REG 0x00
#define BOCO2_ID 0x5b
static int check_boco2(void)
{
int ret;
u8 id;
ret = i2c_read(BOCO_ADDR, ID_REG, 1, &id, 1);
if (ret) {
printf("%s: error reading the BOCO id !!\n", __func__);
return ret;
}
return (id == BOCO2_ID);
}
static int boco_clear_bits(u8 reg, u8 flags)
{
int ret;
u8 regval;
/* give access to the EEPROM from FPGA */
ret = i2c_read(BOCO_ADDR, reg, 1, ®val, 1);
if (ret) {
printf("%s: error reading the BOCO @%#x !!\n",
__func__, reg);
return ret;
}
regval &= ~flags;
ret = i2c_write(BOCO_ADDR, reg, 1, ®val, 1);
if (ret) {
printf("%s: error writing the BOCO @%#x !!\n",
__func__, reg);
return ret;
}
return 0;
}
static int boco_set_bits(u8 reg, u8 flags)
{
int ret;
u8 regval;
/* give access to the EEPROM from FPGA */
ret = i2c_read(BOCO_ADDR, reg, 1, ®val, 1);
if (ret) {
printf("%s: error reading the BOCO @%#x !!\n",
__func__, reg);
return ret;
}
regval |= flags;
ret = i2c_write(BOCO_ADDR, reg, 1, ®val, 1);
if (ret) {
printf("%s: error writing the BOCO @%#x !!\n",
__func__, reg);
return ret;
}
return 0;
}
#define SPI_REG 0x06
#define CFG_EEPROM 0x02
#define FPGA_PROG 0x04
#define FPGA_INIT_B 0x10
#define FPGA_DONE 0x20
#ifndef CONFIG_KM_FPGA_FORCE_CONFIG
static int fpga_done(void)
{
int ret = 0;
u8 regval;
/* this is only supported with the boco2 design */
if (!check_boco2())
return 0;
ret = i2c_read(BOCO_ADDR, SPI_REG, 1, ®val, 1);
if (ret) {
printf("%s: error reading the BOCO @%#x !!\n",
__func__, SPI_REG);
return 0;
}
return regval & FPGA_DONE ? 1 : 0;
}
#endif /* CONFIG_KM_FPGA_FORCE_CONFIG */
static int skip;
int trigger_fpga_config(void)
{
int ret = 0;
skip = 0;
#ifndef CONFIG_KM_FPGA_FORCE_CONFIG
/* if the FPGA is already configured, we do not want to
* reconfigure it
*/
skip = 0;
if (fpga_done()) {
printf("PCIe FPGA config: skipped\n");
skip = 1;
return 0;
}
#endif /* CONFIG_KM_FPGA_FORCE_CONFIG */
if (check_boco2()) {
/* we have a BOCO2, this has to be triggered here */
/* make sure the FPGA_can access the EEPROM */
ret = boco_clear_bits(SPI_REG, CFG_EEPROM);
if (ret)
return ret;
/* trigger the config start */
ret = boco_clear_bits(SPI_REG, FPGA_PROG | FPGA_INIT_B);
if (ret)
return ret;
/* small delay for the pulse */
udelay(10);
/* up signal for pulse end */
ret = boco_set_bits(SPI_REG, FPGA_PROG);
if (ret)
return ret;
/* finally, raise INIT_B to remove the config delay */
ret = boco_set_bits(SPI_REG, FPGA_INIT_B);
if (ret)
return ret;
} else {
/* we do it the old way, with the gpio pin */
kw_gpio_set_valid(KM_XLX_PROGRAM_B_PIN, 1);
kw_gpio_direction_output(KM_XLX_PROGRAM_B_PIN, 0);
/* small delay for the pulse */
udelay(10);
kw_gpio_direction_input(KM_XLX_PROGRAM_B_PIN);
}
return 0;
}
int wait_for_fpga_config(void)
{
int ret = 0;
u8 spictrl;
u32 timeout = 20000;
if (skip)
return 0;
if (!check_boco2()) {
/* we do not have BOCO2, this is not really used */
return 0;
}
printf("PCIe FPGA config:");
do {
ret = i2c_read(BOCO_ADDR, SPI_REG, 1, &spictrl, 1);
if (ret) {
printf("%s: error reading the BOCO spictrl !!\n",
__func__);
return ret;
}
if (timeout-- == 0) {
printf(" FPGA_DONE timeout\n");
return -EFAULT;
}
udelay(10);
} while (!(spictrl & FPGA_DONE));
printf(" done\n");
return 0;
}
#if defined(CONFIG_KM_FPGA_NO_RESET)
int fpga_reset(void)
{
/* no dedicated reset pin for FPGA */
return 0;
}
#else
#define PRST1 0x4
#define PCIE_RST 0x10
#define TRAFFIC_RST 0x04
int fpga_reset(void)
{
int ret = 0;
u8 resets;
if (!check_boco2()) {
/* we do not have BOCO2, this is not really used */
return 0;
}
/* if we have skipped, we only want to reset the PCIe part */
resets = skip ? PCIE_RST : PCIE_RST | TRAFFIC_RST;
ret = boco_clear_bits(PRST1, resets);
if (ret)
return ret;
/* small delay for the pulse */
udelay(10);
ret = boco_set_bits(PRST1, resets);
if (ret)
return ret;
return 0;
}
#endif
/* the FPGA was configured, we configure the BOCO2 so that the EEPROM
* is available from the Bobcat SPI bus
*/
int toggle_eeprom_spi_bus(void)
{
int ret = 0;
if (!check_boco2()) {
/* we do not have BOCO2, this is not really used */
return 0;
}
ret = boco_set_bits(SPI_REG, CFG_EEPROM);
if (ret)
return ret;
return 0;
}
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