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u-boot/board/raspberrypi/rpi/rpi.c
Stephen Warren d22a765755 ARM: add Raspberry Pi 3 64-bit config 
On all Pis so far, the VC FW provides a short stub to set up the ARM CPU
before entering the kernel (a/k/a U-Boot for us). This feature is not
currently supported by the VC FW when booting in 64-bit mode. However,
this feature will likely appear in the near future, and this U-Boot port
assumes that such a feature is in place. Without that feature, or a
temporary workaround described below, U-Boot will not boot.

Once the VC FW does provide the ARM stub, u-boot.bin built for rpi_3 can
be used drectly as kernel7.img, in the same way as any other RPi port. The
following config.txt is required:

    # Fix mini UART input frequency, and setup/enable up the UART.
    # Without this option, U-Boot will not boot, even if you don't care
    # about the serial console. This option will always be required for
    # all RPi3 use-cases, unless the PL011 UART is used, which is not
    # yet supported by rpi_3* builds of U-Boot.
    enable_uart=1
    # Boot in AArch64 (64-bit) mode.
    # It is possible that a future VC FW will remove the need for this
    # option, instead auto-setting 32-/64-bit mode based on the "kernel"
    # filename present on the SD card.
    arm_control=0x200

Prior to the VC FW providing the ARM boot stub, you can use the following
steps to build an equivalent stub into the U-Boot binary:

git clone https://github.com/swarren/rpi-3-aarch64-demo.git \
    ../rpi-3-aarch64-demo
(cd ../rpi-3-aarch64-demo && ./build.sh)
Build U-Boot for rpi_3 in the usual way
cat ../rpi-3-aarch64-demo/armstub64.bin u-boot.bin > u-boot.bin.stubbed
Use u-boot.bin.stubbed as kernel7.img on the Pi SD card.

In this case, the following additional entries are required in config.txt:

    # Tell the FW to load the kernel image at address 0, the reset vector.
    kernel_old=1

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-04-11 12:44:38 -04:00

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/*
* (C) Copyright 2012-2016 Stephen Warren
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <inttypes.h>
#include <config.h>
#include <dm.h>
#include <fdt_support.h>
#include <fdt_simplefb.h>
#include <lcd.h>
#include <memalign.h>
#include <mmc.h>
#include <asm/gpio.h>
#include <asm/arch/mbox.h>
#include <asm/arch/sdhci.h>
#include <asm/global_data.h>
#include <dm/platform_data/serial_pl01x.h>
#include <dm/platform_data/serial_bcm283x_mu.h>
#ifdef CONFIG_ARM64
#include <asm/armv8/mmu.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
static const struct bcm2835_gpio_platdata gpio_platdata = {
.base = BCM2835_GPIO_BASE,
};
U_BOOT_DEVICE(bcm2835_gpios) = {
.name = "gpio_bcm2835",
.platdata = &gpio_platdata,
};
#ifdef CONFIG_PL01X_SERIAL
static const struct pl01x_serial_platdata serial_platdata = {
#ifndef CONFIG_BCM2835
.base = 0x3f201000,
#else
.base = 0x20201000,
#endif
.type = TYPE_PL011,
.skip_init = true,
};
U_BOOT_DEVICE(bcm2835_serials) = {
.name = "serial_pl01x",
.platdata = &serial_platdata,
};
#else
static const struct bcm283x_mu_serial_platdata serial_platdata = {
.base = 0x3f215040,
.clock = 250000000,
.skip_init = true,
};
U_BOOT_DEVICE(bcm2837_serials) = {
.name = "serial_bcm283x_mu",
.platdata = &serial_platdata,
};
#endif
struct msg_get_arm_mem {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
u32 end_tag;
};
struct msg_get_board_rev {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_board_rev get_board_rev;
u32 end_tag;
};
struct msg_get_board_serial {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_board_serial get_board_serial;
u32 end_tag;
};
struct msg_get_mac_address {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_mac_address get_mac_address;
u32 end_tag;
};
struct msg_set_power_state {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_set_power_state set_power_state;
u32 end_tag;
};
struct msg_get_clock_rate {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
u32 end_tag;
};
/*
* http://raspberryalphaomega.org.uk/2013/02/06/automatic-raspberry-pi-board-revision-detection-model-a-b1-and-b2/
* http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=32733
* http://git.drogon.net/?p=wiringPi;a=blob;f=wiringPi/wiringPi.c;h=503151f61014418b9c42f4476a6086f75cd4e64b;hb=refs/heads/master#l922
*
* In http://lists.denx.de/pipermail/u-boot/2016-January/243752.html
* ("[U-Boot] [PATCH] rpi: fix up Model B entries") Dom Cobley at the RPi
* Foundation stated that the following source was accurate:
* https://github.com/AndrewFromMelbourne/raspberry_pi_revision
*/
struct rpi_model {
const char *name;
const char *fdtfile;
bool has_onboard_eth;
};
static const struct rpi_model rpi_model_unknown = {
"Unknown model",
"bcm283x-rpi-other.dtb",
false,
};
static const struct rpi_model rpi_models_new_scheme[] = {
[0x4] = {
"2 Model B",
"bcm2836-rpi-2-b.dtb",
true,
},
[0x8] = {
"3 Model B",
"bcm2837-rpi-3-b.dtb",
true,
},
[0x9] = {
"Zero",
"bcm2835-rpi-zero.dtb",
false,
},
};
static const struct rpi_model rpi_models_old_scheme[] = {
[0x2] = {
"Model B",
"bcm2835-rpi-b.dtb",
true,
},
[0x3] = {
"Model B",
"bcm2835-rpi-b.dtb",
true,
},
[0x4] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0x5] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0x6] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0x7] = {
"Model A",
"bcm2835-rpi-a.dtb",
false,
},
[0x8] = {
"Model A",
"bcm2835-rpi-a.dtb",
false,
},
[0x9] = {
"Model A",
"bcm2835-rpi-a.dtb",
false,
},
[0xd] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0xe] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0xf] = {
"Model B rev2",
"bcm2835-rpi-b-rev2.dtb",
true,
},
[0x10] = {
"Model B+",
"bcm2835-rpi-b-plus.dtb",
true,
},
[0x11] = {
"Compute Module",
"bcm2835-rpi-cm.dtb",
false,
},
[0x12] = {
"Model A+",
"bcm2835-rpi-a-plus.dtb",
false,
},
[0x13] = {
"Model B+",
"bcm2835-rpi-b-plus.dtb",
true,
},
[0x14] = {
"Compute Module",
"bcm2835-rpi-cm.dtb",
false,
},
[0x15] = {
"Model A+",
"bcm2835-rpi-a-plus.dtb",
false,
},
};
static uint32_t revision;
static uint32_t rev_scheme;
static uint32_t rev_type;
static const struct rpi_model *model;
#ifdef CONFIG_ARM64
static struct mm_region bcm2837_mem_map[] = {
{
.base = 0x00000000UL,
.size = 0x3f000000UL,
.attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
PTE_BLOCK_INNER_SHARE
}, {
.base = 0x3f000000UL,
.size = 0x01000000UL,
.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
PTE_BLOCK_NON_SHARE |
PTE_BLOCK_PXN | PTE_BLOCK_UXN
}, {
/* List terminator */
0,
}
};
struct mm_region *mem_map = bcm2837_mem_map;
#endif
int dram_init(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1);
int ret;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret) {
printf("bcm2835: Could not query ARM memory size\n");
return -1;
}
gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
return 0;
}
static void set_fdtfile(void)
{
const char *fdtfile;
if (getenv("fdtfile"))
return;
fdtfile = model->fdtfile;
setenv("fdtfile", fdtfile);
}
static void set_usbethaddr(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1);
int ret;
if (!model->has_onboard_eth)
return;
if (getenv("usbethaddr"))
return;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret) {
printf("bcm2835: Could not query MAC address\n");
/* Ignore error; not critical */
return;
}
eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
if (!getenv("ethaddr"))
setenv("ethaddr", getenv("usbethaddr"));
return;
}
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
static void set_board_info(void)
{
char s[11];
snprintf(s, sizeof(s), "0x%X", revision);
setenv("board_revision", s);
snprintf(s, sizeof(s), "%d", rev_scheme);
setenv("board_rev_scheme", s);
/* Can't rename this to board_rev_type since it's an ABI for scripts */
snprintf(s, sizeof(s), "0x%X", rev_type);
setenv("board_rev", s);
setenv("board_name", model->name);
}
#endif /* CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG */
static void set_serial_number(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_serial, msg, 1);
int ret;
char serial_string[17] = { 0 };
if (getenv("serial#"))
return;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG_NO_REQ(&msg->get_board_serial, GET_BOARD_SERIAL);
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret) {
printf("bcm2835: Could not query board serial\n");
/* Ignore error; not critical */
return;
}
snprintf(serial_string, sizeof(serial_string), "%016" PRIx64,
msg->get_board_serial.body.resp.serial);
setenv("serial#", serial_string);
}
int misc_init_r(void)
{
set_fdtfile();
set_usbethaddr();
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
set_board_info();
#endif
set_serial_number();
return 0;
}
static int power_on_module(u32 module)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_set_power_state, msg_pwr, 1);
int ret;
BCM2835_MBOX_INIT_HDR(msg_pwr);
BCM2835_MBOX_INIT_TAG(&msg_pwr->set_power_state,
SET_POWER_STATE);
msg_pwr->set_power_state.body.req.device_id = module;
msg_pwr->set_power_state.body.req.state =
BCM2835_MBOX_SET_POWER_STATE_REQ_ON |
BCM2835_MBOX_SET_POWER_STATE_REQ_WAIT;
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN,
&msg_pwr->hdr);
if (ret) {
printf("bcm2835: Could not set module %u power state\n",
module);
return -1;
}
return 0;
}
static void get_board_rev(void)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_board_rev, msg, 1);
int ret;
const struct rpi_model *models;
uint32_t models_count;
BCM2835_MBOX_INIT_HDR(msg);
BCM2835_MBOX_INIT_TAG(&msg->get_board_rev, GET_BOARD_REV);
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
if (ret) {
printf("bcm2835: Could not query board revision\n");
/* Ignore error; not critical */
return;
}
/*
* For details of old-vs-new scheme, see:
* https://github.com/pimoroni/RPi.version/blob/master/RPi/version.py
* http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=99293&p=690282
* (a few posts down)
*
* For the RPi 1, bit 24 is the "warranty bit", so we mask off just the
* lower byte to use as the board rev:
* http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=98367&start=250
* http://www.raspberrypi.org/forums/viewtopic.php?f=31&t=20594
*/
revision = msg->get_board_rev.body.resp.rev;
if (revision & 0x800000) {
rev_scheme = 1;
rev_type = (revision >> 4) & 0xff;
models = rpi_models_new_scheme;
models_count = ARRAY_SIZE(rpi_models_new_scheme);
} else {
rev_scheme = 0;
rev_type = revision & 0xff;
models = rpi_models_old_scheme;
models_count = ARRAY_SIZE(rpi_models_old_scheme);
}
if (rev_type >= models_count) {
printf("RPI: Board rev 0x%x outside known range\n", rev_type);
model = &rpi_model_unknown;
} else if (!models[rev_type].name) {
printf("RPI: Board rev 0x%x unknown\n", rev_type);
model = &rpi_model_unknown;
} else {
model = &models[rev_type];
}
printf("RPI %s (0x%x)\n", model->name, revision);
}
int board_init(void)
{
get_board_rev();
gd->bd->bi_boot_params = 0x100;
return power_on_module(BCM2835_MBOX_POWER_DEVID_USB_HCD);
}
int board_mmc_init(bd_t *bis)
{
ALLOC_CACHE_ALIGN_BUFFER(struct msg_get_clock_rate, msg_clk, 1);
int ret;
power_on_module(BCM2835_MBOX_POWER_DEVID_SDHCI);
BCM2835_MBOX_INIT_HDR(msg_clk);
BCM2835_MBOX_INIT_TAG(&msg_clk->get_clock_rate, GET_CLOCK_RATE);
msg_clk->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg_clk->hdr);
if (ret) {
printf("bcm2835: Could not query eMMC clock rate\n");
return -1;
}
return bcm2835_sdhci_init(BCM2835_SDHCI_BASE,
msg_clk->get_clock_rate.body.resp.rate_hz);
}
int ft_board_setup(void *blob, bd_t *bd)
{
/*
* For now, we simply always add the simplefb DT node. Later, we
* should be more intelligent, and e.g. only do this if no enabled DT
* node exists for the "real" graphics driver.
*/
lcd_dt_simplefb_add_node(blob);
return 0;
}
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