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drivers: hwinfo: add driver support for Atmel SAM0 device ID

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Add driver support for Atmel SAM0 device ID, which is 16-bytes long.
The device ID can simply be read from memory at a known location, but
the location is only described in the data sheet, not in ASF.

For SAMD2x it's 0x0080A00C, 0x0080A040, 0x0080A044 & 0x0080A048.
For SAMD5x it's 0x008061FC, 0x00806010, 0x00806014 & 0x00806018.

This adds a new property to the device tree to define the device ID
registers for this SoC family.

Signed-off-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
This commit is contained in:
Benjamin Valentin 2019-03-26 14:17:48 +01:00 • committed by Anas Nashif
commit c43067047c
5 changed files with 68 additions and 0 deletions
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1
drivers/hwinfo/CMakeLists.txt
View file

@ -8,5 +8,6 @@ zephyr_sources_ifdef(CONFIG_HWINFO_NRF hwinfo_nrf.c)
zephyr_sources_ifdef(CONFIG_HWINFO_MCUX_SIM hwinfo_mcux_sim.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_SHELL hwinfo_shell.c)

7
drivers/hwinfo/Kconfig
View file

@ -55,4 +55,11 @@ config HWINFO_SAM
help
Enable Atmel SAM hwinfo driver.
config HWINFO_SAM0
bool "Atmel SAM0 device ID"
default y
depends on SOC_FAMILY_SAM0
help
Enable Atmel SAM0 hwinfo driver.
endif

31
drivers/hwinfo/hwinfo_sam0.c Normal file
View file

@ -0,0 +1,31 @@
/*
* Copyright (c) 2019 ML!PA Consulting GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <soc.h>
#include <hwinfo.h>
#include <string.h>
struct sam0_uid {
u32_t id[4];
};
ssize_t z_impl_hwinfo_get_device_id(u8_t *buffer, size_t length)
{
struct sam0_uid dev_id;
dev_id.id[0] = *(const u32_t *) DT_ATMEL_SAM0_ID_0_BASE_ADDRESS_0;
dev_id.id[1] = *(const u32_t *) DT_ATMEL_SAM0_ID_0_BASE_ADDRESS_1;
dev_id.id[2] = *(const u32_t *) DT_ATMEL_SAM0_ID_0_BASE_ADDRESS_2;
dev_id.id[3] = *(const u32_t *) DT_ATMEL_SAM0_ID_0_BASE_ADDRESS_3;
if (length > sizeof(dev_id.id)) {
length = sizeof(dev_id.id);
}
memcpy(buffer, dev_id.id, length);
return length;
}

8
dts/arm/atmel/samd.dtsi
View file

@ -25,6 +25,14 @@
reg = <0x20000000 0x8000>;
};
id: device_id@0 {
compatible = "atmel,sam0-id";
reg = <0x0080A00C 0x4>,
<0x0080A040 0x4>,
<0x0080A044 0x4>,
<0x0080A048 0x4>;
};
soc {
nvmctrl: nvmctrl@41004000 {
compatible = "atmel,sam0-nvmctrl";

21
dts/bindings/arm/atmel,sam0-device_id.yaml Normal file
View file

@ -0,0 +1,21 @@
---
title: Atmel Device ID (Serial Number) binding
version: 0.1
description: >
Binding for locating the Device ID (serial number) on Atmel SAM0 devices.
properties:
compatible:
type: string
category: required
description: compatible strings
constraint: "atmel,sam0-id"
generation: define
reg:
type: array
category: required
description: Location of Device ID words in memory
generation: define
...