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u-boot/arch/arm/mach-tegra/board2.c
Stephen Warren 0797f7f0b7 ARM: tegra: reserve unmapped RAM so EFI doesn't use it
Tegra U-Boot ensures that board_get_usable_ram_top() never returns a value
over 4GB, since some peripherals can't access such addresses. However, on
systems with more than 2GB of RAM, RAM bank 1 does describe this extra
RAM, so that Linux (or whatever OS) can use it, subject to DMA
limitations. Since board_get_usable_ram_top() points at the top of RAM
bank 0, the memory locations describes by RAM bank 1 are not mapped by
U-Boot's MMU configuration, and so cannot be used for anything.

For some completely inexplicable reason, U-Boot's EFI support ignores the
value returned by board_get_usable_ram_top(), and EFI memory allocation
routines will return values above U-Boot's RAM top. This causes U-Boot to
crash when it accesses that RAM, since it isn't mapped by the MMU. One
use-case where this happens is TFTP download of a file on Jetson TX1
(p2371-2180).

This change explicitly tells the EFI code that this extra RAM should not
be used, thus avoiding the crash.

A previous attempt to make EFI honor board_get_usable_ram_top() was
rejected. So, this patch will need to be replicated for any board that
implements board_get_usable_ram_top().

Fixes: aa909462d0 ("efi_loader: efi_allocate_pages is too restrictive")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2018-09-23 21:55:29 +02:00

364 lines
9.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.com>
*/
#include <common.h>
#include <dm.h>
#include <efi_loader.h>
#include <errno.h>
#include <ns16550.h>
#include <usb.h>
#include <asm/io.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>
#include <asm/arch-tegra/gpu.h>
#include <asm/arch-tegra/usb.h>
#include <asm/arch-tegra/xusb-padctl.h>
#include <asm/arch/clock.h>
#include <asm/arch/funcmux.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/pmu.h>
#include <asm/arch/tegra.h>
#ifdef CONFIG_TEGRA_CLOCK_SCALING
#include <asm/arch/emc.h>
#endif
#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
__weak void pinmux_init(void) {}
__weak void pin_mux_usb(void) {}
__weak void pin_mux_spi(void) {}
__weak void pin_mux_mmc(void) {}
__weak void gpio_early_init_uart(void) {}
__weak void pin_mux_display(void) {}
__weak void start_cpu_fan(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
}
__weak int tegra_board_id(void)
{
return -1;
}
#ifdef CONFIG_DISPLAY_BOARDINFO
int checkboard(void)
{
int board_id = tegra_board_id();
printf("Board: %s", CONFIG_TEGRA_BOARD_STRING);
if (board_id != -1)
printf(", ID: %d\n", board_id);
printf("\n");
return 0;
}
#endif /* CONFIG_DISPLAY_BOARDINFO */
__weak int tegra_lcd_pmic_init(int board_it)
{
return 0;
}
__weak int nvidia_board_init(void)
{
return 0;
}
/*
* Routine: board_init
* Description: Early hardware init.
*/
int board_init(void)
{
__maybe_unused int err;
__maybe_unused int board_id;
/* Do clocks and UART first so that printf() works */
clock_init();
clock_verify();
tegra_gpu_config();
#ifdef CONFIG_TEGRA_SPI
pin_mux_spi();
#endif
#ifdef CONFIG_MMC_SDHCI_TEGRA
pin_mux_mmc();
#endif
/* Init is handled automatically in the driver-model case */
#if defined(CONFIG_DM_VIDEO)
pin_mux_display();
#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();
#endif
#if defined(CONFIG_DM_VIDEO)
board_id = tegra_board_id();
err = tegra_lcd_pmic_init(board_id);
if (err) {
debug("Failed to set up LCD PMIC\n");
return err;
}
#endif
#ifdef CONFIG_TEGRA_NAND
pin_mux_nand();
#endif
tegra_xusb_padctl_init();
#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 nvidia_board_init();
}
#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)
{
if (!clock_early_init_done())
clock_early_init();
#if defined(CONFIG_TEGRA_DISCONNECT_UDC_ON_BOOT)
#define USBCMD_FS2 (1 << 15)
{
struct usb_ctlr *usbctlr = (struct usb_ctlr *)0x7d000000;
writel(USBCMD_FS2, &usbctlr->usb_cmd);
}
#endif
/* Do any special system timer/TSC setup */
#if defined(CONFIG_TEGRA_SUPPORT_NON_SECURE)
if (!tegra_cpu_is_non_secure())
#endif
arch_timer_init();
pinmux_init();
board_init_uart_f();
/* Initialize periph GPIOs */
gpio_early_init();
gpio_early_init_uart();
return 0;
}
#endif /* EARLY_INIT */
int board_late_init(void)
{
#if CONFIG_IS_ENABLED(EFI_LOADER)
if (gd->bd->bi_dram[1].start) {
/*
* Only bank 0 is below board_get_usable_ram_top(), so all of
* bank 1 is not mapped by the U-Boot MMU configuration, and so
* we must prevent EFI from using it.
*/
efi_add_memory_map(gd->bd->bi_dram[1].start,
gd->bd->bi_dram[1].size >> EFI_PAGE_SHIFT,
EFI_BOOT_SERVICES_DATA, false);
}
#endif
#if defined(CONFIG_TEGRA_SUPPORT_NON_SECURE)
if (tegra_cpu_is_non_secure()) {
printf("CPU is in NS mode\n");
env_set("cpu_ns_mode", "1");
} else {
env_set("cpu_ns_mode", "");
}
#endif
start_cpu_fan();
return 0;
}
/*
* In some SW environments, a memory carve-out exists to house a secure
* monitor, a trusted OS, and/or various statically allocated media buffers.
*
* This carveout exists at the highest possible address that is within a
* 32-bit physical address space.
*
* This function returns the total size of this carve-out. At present, the
* returned value is hard-coded for simplicity. In the future, it may be
* possible to determine the carve-out size:
* - By querying some run-time information source, such as:
* - A structure passed to U-Boot by earlier boot software.
* - SoC registers.
* - A call into the secure monitor.
* - In the per-board U-Boot configuration header, based on knowledge of the
* SW environment that U-Boot is being built for.
*
* For now, we support two configurations in U-Boot:
* - 32-bit ports without any form of carve-out.
* - 64 bit ports which are assumed to use a carve-out of a conservatively
* hard-coded size.
*/
static ulong carveout_size(void)
{
#ifdef CONFIG_ARM64
return SZ_512M;
#elif defined(CONFIG_ARMV7_SECURE_RESERVE_SIZE)
// BASE+SIZE might not == 4GB. If so, we want the carveout to cover
// from BASE to 4GB, not BASE to BASE+SIZE.
return (0 - CONFIG_ARMV7_SECURE_BASE) & ~(SZ_2M - 1);
#else
return 0;
#endif
}
/*
* Determine the amount of usable RAM below 4GiB, taking into account any
* carve-out that may be assigned.
*/
static ulong usable_ram_size_below_4g(void)
{
ulong total_size_below_4g;
ulong usable_size_below_4g;
/*
* The total size of RAM below 4GiB is the lesser address of:
* (a) 2GiB itself (RAM starts at 2GiB, and 4GiB - 2GiB == 2GiB).
* (b) The size RAM physically present in the system.
*/
if (gd->ram_size < SZ_2G)
total_size_below_4g = gd->ram_size;
else
total_size_below_4g = SZ_2G;
/* Calculate usable RAM by subtracting out any carve-out size */
usable_size_below_4g = total_size_below_4g - carveout_size();
return usable_size_below_4g;
}
/*
* Represent all available RAM in either one or two banks.
*
* The first bank describes any usable RAM below 4GiB.
* The second bank describes any RAM above 4GiB.
*
* This split is driven by the following requirements:
* - The NVIDIA L4T kernel requires separate entries in the DT /memory/reg
* property for memory below and above the 4GiB boundary. The layout of that
* DT property is directly driven by the entries in the U-Boot bank array.
* - The potential existence of a carve-out at the end of RAM below 4GiB can
* only be represented using multiple banks.
*
* Explicitly removing the carve-out RAM from the bank entries makes the RAM
* layout a bit more obvious, e.g. when running "bdinfo" at the U-Boot
* command-line.
*
* This does mean that the DT U-Boot passes to the Linux kernel will not
* include this RAM in /memory/reg at all. An alternative would be to include
* all RAM in the U-Boot banks (and hence DT), and add a /memreserve/ node
* into DT to stop the kernel from using the RAM. IIUC, I don't /think/ the
* Linux kernel will ever need to access any RAM in* the carve-out via a CPU
* mapping, so either way is acceptable.
*
* On 32-bit systems, we never define a bank for RAM above 4GiB, since the
* start address of that bank cannot be represented in the 32-bit .size
* field.
*/
int dram_init_banksize(void)
{
gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
gd->bd->bi_dram[0].size = usable_ram_size_below_4g();
#ifdef CONFIG_PCI
gd->pci_ram_top = gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size;
#endif
#ifdef CONFIG_PHYS_64BIT
if (gd->ram_size > SZ_2G) {
gd->bd->bi_dram[1].start = 0x100000000;
gd->bd->bi_dram[1].size = gd->ram_size - SZ_2G;
} else
#endif
{
gd->bd->bi_dram[1].start = 0;
gd->bd->bi_dram[1].size = 0;
}
return 0;
}
/*
* Most hardware on 64-bit Tegra is still restricted to DMA to the lower
* 32-bits of the physical address space. Cap the maximum usable RAM area
* at 4 GiB to avoid DMA buffers from being allocated beyond the 32-bit
* boundary that most devices can address. Also, don't let U-Boot use any
* carve-out, as mentioned above.
*
* This function is called before dram_init_banksize(), so we can't simply
* return gd->bd->bi_dram[1].start + gd->bd->bi_dram[1].size.
*/
ulong board_get_usable_ram_top(ulong total_size)
{
return CONFIG_SYS_SDRAM_BASE + usable_ram_size_below_4g();
}