u-boot/board/nvidia/p2771-0000/p2771-0000.c
Stephen Warren a6bb0084c2 ARM: tegra: enable PCIe controller on p2771-0000
p2771-0000 has a couple of PCIe ports; one physically x4 desktop PCI
connector (which may run at x2 electrically, depending on the board
version and configuration) and a x1 connection to the M.2 slot (which may
not be active, depending on the board version and configuration). This
change enables those.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
2016-08-15 10:26:13 -07:00

55 lines
1.3 KiB
C

/*
* Copyright (c) 2016, NVIDIA CORPORATION
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <i2c.h>
#include "../p2571/max77620_init.h"
int tegra_board_init(void)
{
struct udevice *dev;
uchar val;
int ret;
/* Turn on MAX77620 LDO3 to 3.3V for SD card power */
debug("%s: Set LDO3 for VDDIO_SDMMC_AP power to 3.3V\n", __func__);
ret = i2c_get_chip_for_busnum(0, MAX77620_I2C_ADDR_7BIT, 1, &dev);
if (ret) {
printf("%s: Cannot find MAX77620 I2C chip\n", __func__);
return ret;
}
/* 0xF2 for 3.3v, enabled: bit7:6 = 11 = enable, bit5:0 = voltage */
val = 0xF2;
ret = dm_i2c_write(dev, MAX77620_CNFG1_L3_REG, &val, 1);
if (ret) {
printf("i2c_write 0 0x3c 0x27 failed: %d\n", ret);
return ret;
}
return 0;
}
int tegra_pcie_board_init(void)
{
struct udevice *dev;
uchar val;
int ret;
/* Turn on MAX77620 LDO7 to 1.05V for PEX power */
debug("%s: Set LDO7 for PEX power to 1.05V\n", __func__);
ret = i2c_get_chip_for_busnum(0, MAX77620_I2C_ADDR_7BIT, 1, &dev);
if (ret) {
printf("%s: Cannot find MAX77620 I2C chip\n", __func__);
return -1;
}
/* 0xC5 for 1.05v, enabled: bit7:6 = 11 = enable, bit5:0 = voltage */
val = 0xC5;
ret = dm_i2c_write(dev, MAX77620_CNFG1_L7_REG, &val, 1);
if (ret)
printf("i2c_write 0 0x3c 0x31 failed: %d\n", ret);
return 0;
}