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u-boot/board/nvidia/common/board.c
Stephen Warren 73c38934da ARM: tegra: support running in non-secure mode 
When the CPU is in non-secure (NS) mode (when running U-Boot under a
secure monitor), certain actions cannot be taken, since they would need
to write to secure-only registers. One example is configuring the ARM
architectural timer's CNTFRQ register.

We could support this in one of two ways:
1) Compile twice, once for secure mode (in which case anything goes) and
   once for non-secure mode (in which case certain actions are disabled).
   This complicates things, since everyone needs to keep track of
   different U-Boot binaries for different situations.
2) Detect NS mode at run-time, and optionally skip any impossible actions.
   This has the advantage of a single U-Boot binary working in all cases.

(2) is not possible on ARM in general, since there's no architectural way
to detect secure-vs-non-secure. However, there is a Tegra-specific way to
detect this.

This patches uses that feature to detect secure vs. NS mode on Tegra, and
uses that to:

* Skip the ARM arch timer initialization.

* Set/clear an environment variable so that boot scripts can take
  different action depending on which mode the CPU is in. This might be
  something like:
  if CPU is secure:
    load secure monitor code into RAM.
    boot secure monitor.
    secure monitor will restart (a new copy of) U-Boot in NS mode.
  else:
    execute normal boot process

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
2015-03-04 10:08:57 -07:00

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/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <ns16550.h>
#include <linux/compiler.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#ifdef CONFIG_LCD
#include <asm/arch/display.h>
#endif
#include <asm/arch/funcmux.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/pmu.h>
#ifdef CONFIG_PWM_TEGRA
#include <asm/arch/pwm.h>
#endif
#include <asm/arch/tegra.h>
#include <asm/arch-tegra/ap.h>
#include <asm/arch-tegra/board.h>
#include <asm/arch-tegra/clk_rst.h>
#include <asm/arch-tegra/pmc.h>
#include <asm/arch-tegra/sys_proto.h>
#include <asm/arch-tegra/uart.h>
#include <asm/arch-tegra/warmboot.h>
#ifdef CONFIG_TEGRA_CLOCK_SCALING
#include <asm/arch/emc.h>
#endif
#ifdef CONFIG_USB_EHCI_TEGRA
#include <asm/arch-tegra/usb.h>
#include <usb.h>
#endif
#ifdef CONFIG_TEGRA_MMC
#include <asm/arch-tegra/tegra_mmc.h>
#include <asm/arch-tegra/mmc.h>
#endif
#include <asm/arch-tegra/xusb-padctl.h>
#include <i2c.h>
#include <spi.h>
#include "emc.h"
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SPL_BUILD
/* TODO(sjg@chromium.org): Remove once SPL supports device tree */
U_BOOT_DEVICE(tegra_gpios) = {
"gpio_tegra"
};
#endif
const struct tegra_sysinfo sysinfo = {
CONFIG_TEGRA_BOARD_STRING
};
__weak void pinmux_init(void) {}
__weak void pin_mux_usb(void) {}
__weak void pin_mux_spi(void) {}
__weak void gpio_early_init_uart(void) {}
__weak void pin_mux_display(void) {}
#if defined(CONFIG_TEGRA_NAND)
__weak void pin_mux_nand(void)
{
funcmux_select(PERIPH_ID_NDFLASH, FUNCMUX_DEFAULT);
}
#endif
/*
* Routine: power_det_init
* Description: turn off power detects
*/
static void power_det_init(void)
{
#if defined(CONFIG_TEGRA20)
struct pmc_ctlr *const pmc = (struct pmc_ctlr *)NV_PA_PMC_BASE;
/* turn off power detects */
writel(0, &pmc->pmc_pwr_det_latch);
writel(0, &pmc->pmc_pwr_det);
#endif
}
/*
* Routine: board_init
* Description: Early hardware init.
*/
int board_init(void)
{
__maybe_unused int err;
/* Do clocks and UART first so that printf() works */
clock_init();
clock_verify();
#ifdef CONFIG_TEGRA_SPI
pin_mux_spi();
#endif
#ifdef CONFIG_PWM_TEGRA
if (pwm_init(gd->fdt_blob))
debug("%s: Failed to init pwm\n", __func__);
#endif
#ifdef CONFIG_LCD
pin_mux_display();
tegra_lcd_check_next_stage(gd->fdt_blob, 0);
#endif
/* boot param addr */
gd->bd->bi_boot_params = (NV_PA_SDRAM_BASE + 0x100);
power_det_init();
#ifdef CONFIG_SYS_I2C_TEGRA
# ifdef CONFIG_TEGRA_PMU
if (pmu_set_nominal())
debug("Failed to select nominal voltages\n");
# ifdef CONFIG_TEGRA_CLOCK_SCALING
err = board_emc_init();
if (err)
debug("Memory controller init failed: %d\n", err);
# endif
# endif /* CONFIG_TEGRA_PMU */
#endif /* CONFIG_SYS_I2C_TEGRA */
#ifdef CONFIG_USB_EHCI_TEGRA
pin_mux_usb();
usb_process_devicetree(gd->fdt_blob);
#endif
#ifdef CONFIG_LCD
tegra_lcd_check_next_stage(gd->fdt_blob, 0);
#endif
#ifdef CONFIG_TEGRA_NAND
pin_mux_nand();
#endif
tegra_xusb_padctl_init(gd->fdt_blob);
#ifdef CONFIG_TEGRA_LP0
/* save Sdram params to PMC 2, 4, and 24 for WB0 */
warmboot_save_sdram_params();
/* prepare the WB code to LP0 location */
warmboot_prepare_code(TEGRA_LP0_ADDR, TEGRA_LP0_SIZE);
#endif
return 0;
}
#ifdef CONFIG_BOARD_EARLY_INIT_F
static void __gpio_early_init(void)
{
}
void gpio_early_init(void) __attribute__((weak, alias("__gpio_early_init")));
int board_early_init_f(void)
{
pinmux_init();
board_init_uart_f();
/* Initialize periph GPIOs */
gpio_early_init();
gpio_early_init_uart();
#ifdef CONFIG_LCD
tegra_lcd_early_init(gd->fdt_blob);
#endif
return 0;
}
#endif /* EARLY_INIT */
int board_late_init(void)
{
#ifdef CONFIG_LCD
/* Make sure we finish initing the LCD */
tegra_lcd_check_next_stage(gd->fdt_blob, 1);
#endif
#if defined(CONFIG_TEGRA_SUPPORT_NON_SECURE)
if (tegra_cpu_is_non_secure()) {
printf("CPU is in NS mode\n");
setenv("cpu_ns_mode", "1");
} else {
setenv("cpu_ns_mode", "");
}
#endif
return 0;
}
#if defined(CONFIG_TEGRA_MMC)
__weak void pin_mux_mmc(void)
{
}
/* this is a weak define that we are overriding */
int board_mmc_init(bd_t *bd)
{
debug("%s called\n", __func__);
/* Enable muxes, etc. for SDMMC controllers */
pin_mux_mmc();
debug("%s: init MMC\n", __func__);
tegra_mmc_init();
return 0;
}
void pad_init_mmc(struct mmc_host *host)
{
#if defined(CONFIG_TEGRA30)
enum periph_id id = host->mmc_id;
u32 val;
debug("%s: sdmmc address = %08x, id = %d\n", __func__,
(unsigned int)host->reg, id);
/* Set the pad drive strength for SDMMC1 or 3 only */
if (id != PERIPH_ID_SDMMC1 && id != PERIPH_ID_SDMMC3) {
debug("%s: settings are only valid for SDMMC1/SDMMC3!\n",
__func__);
return;
}
val = readl(&host->reg->sdmemcmppadctl);
val &= 0xFFFFFFF0;
val |= MEMCOMP_PADCTRL_VREF;
writel(val, &host->reg->sdmemcmppadctl);
val = readl(&host->reg->autocalcfg);
val &= 0xFFFF0000;
val |= AUTO_CAL_PU_OFFSET | AUTO_CAL_PD_OFFSET | AUTO_CAL_ENABLED;
writel(val, &host->reg->autocalcfg);
#endif /* T30 */
}
#endif /* MMC */
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