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drivers: hwinfo: Add LiteX DNA driver

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This commit adds driver supporting reading DNA ID value for LiteX SoC
builder.

Signed-off-by: Jakub Wegnerowski <jwegnerowski@internships.antmicro.com>
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
This commit is contained in:
Jakub Wegnerowski 2019-09-11 17:35:02 +02:00 • committed by Carles Cufí
commit ab1ba3d4cf
4 changed files with 52 additions and 1 deletions
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2
drivers/hwinfo/CMakeLists.txt
View file

@ -10,5 +10,5 @@ zephyr_sources_ifdef(CONFIG_HWINFO_ESP32 hwinfo_esp32.c)
zephyr_sources_ifdef(CONFIG_HWINFO_IMXRT hwinfo_imxrt.c)
zephyr_sources_ifdef(CONFIG_HWINFO_SAM hwinfo_sam.c)
zephyr_sources_ifdef(CONFIG_HWINFO_SAM0 hwinfo_sam0.c)
zephyr_sources_ifdef(CONFIG_HWINFO_LITEX hwinfo_litex.c)
zephyr_sources_ifdef(CONFIG_HWINFO_SHELL hwinfo_shell.c)

6
drivers/hwinfo/Kconfig
View file

@ -69,4 +69,10 @@ config HWINFO_ESP32
help
Enable ESP32 hwinfo driver.
config HWINFO_LITEX
bool "LiteX device ID"
default y
depends on SOC_RISCV32_LITEX_VEXRISCV
help
Enable LiteX hwinfo driver
endif

25
drivers/hwinfo/hwinfo_litex.c Normal file
View file

@ -0,0 +1,25 @@
/*
* Copyright (c) 2019 Antmicro <www.antmicro.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <drivers/hwinfo.h>
#include <soc.h>
#include <string.h>
#include <device.h>
#include <sys/util.h>
ssize_t z_impl_hwinfo_get_device_id(u8_t *buffer, size_t length)
{
u32_t volatile *ptr = (u32_t volatile *)(DT_INST_0_LITEX_DNA0_BASE_ADDRESS);
ssize_t end = MIN(length, (DT_INST_0_LITEX_DNA0_SIZE / sizeof(u32_t)));
for (int i = 0; i < end; i++) {
/* In LiteX even though registers are 32-bit wide, each one
contains meaningful data only in the lowest 8 bits */
buffer[i] = (u8_t)(ptr[i] & 0xff);
}
return end;
}