GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drivers/i2c/rx6110sa: Add basic ACPI support 

This patch adds basic ACPI support for the RTC so that the OS is able to
use this RTC via the ACPI interface.

If the Linux kernel is able to find the RTC in ACPI scope, you should
see the following lines in dmesg, where [n] is an enumerated number:

rx6110 i2c-RX6110SA:00: rtc core: registered RX6110SA:00 as rtc[n]
rtc rtc[n]: Update timer was detected

Change-Id: I9b319e3088e6511592075b055f8fa3e2aedaa209
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47235
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Werner Zeh 2020-11-05 10:41:26 +01:00
parent 81547dd546
commit b64db833d6
3 changed files with 70 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/drivers/i2c/rx6110sa/chip.h
View File

@ -3,6 +3,7 @@
#include "rx6110sa.h"
struct drivers_i2c_rx6110sa_config {
unsigned int bus_speed; /* Bus clock in Hz (default 400 kHz)*/
/* The day (of the week) is indicated by 7 bits, bit 0 to bit 6. */
unsigned char user_weekday; /* User day of the week to set */
unsigned char user_day; /* User day to set */

67
src/drivers/i2c/rx6110sa/rx6110sa.c
View File

@ -1,7 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/i2c_bus.h>
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <device/device.h>
#include <device/i2c.h>
#include <device/i2c_bus.h>
#include <version.h>
#include <console/console.h>
#include <bcd.h>
@ -163,11 +166,71 @@ static void rx6110sa_init(struct device *dev)
rx6110sa_write(dev, CTRL_REG, reg);
}
#if CONFIG(HAVE_ACPI_TABLES)
static void rx6110sa_fill_ssdt(const struct device *dev)
{
struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
enum i2c_speed bus_speed;
if (!scope)
return;
switch (config->bus_speed) {
case I2C_SPEED_STANDARD:
case I2C_SPEED_FAST:
bus_speed = config->bus_speed;
break;
default:
printk(BIOS_INFO, "%s: Bus speed unsupported, fall back to %d kHz!\n",
dev_path(dev), I2C_SPEED_STANDARD / 1000);
bus_speed = I2C_SPEED_STANDARD;
break;
}
struct acpi_i2c i2c = {
.address = dev->path.i2c.device,
.mode_10bit = dev->path.i2c.mode_10bit,
.speed = bus_speed,
.resource = scope,
};
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", RX6110SA_HID_NAME);
acpigen_write_name_string("_DDN", RX6110SA_HID_DESC);
acpigen_write_STA(acpi_device_status(dev));
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_i2c(&i2c);
acpigen_write_resourcetemplate_footer();
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
dev->chip_ops->name, dev_path(dev));
}
static const char *rx6110sa_acpi_name(const struct device *dev)
{
return RX6110SA_ACPI_NAME;
}
#endif
static struct device_operations rx6110sa_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = rx6110sa_init,
.final = rx6110sa_final
.final = rx6110sa_final,
#if CONFIG(HAVE_ACPI_TABLES)
.acpi_name = rx6110sa_acpi_name,
.acpi_fill_ssdt = rx6110sa_fill_ssdt,
#endif
};
static void rx6110sa_enable(struct device *dev)

4
src/drivers/i2c/rx6110sa/rx6110sa.h
View File

@ -7,6 +7,10 @@
#define RX6110SA_SLAVE_ADR 0x32
#define RX6110SA_I2C_CONTROLLER 0
#define RX6110SA_ACPI_NAME "ERX6"
#define RX6110SA_HID_NAME "RX6110SA"
#define RX6110SA_HID_DESC "Real Time Clock"
/* Register layout */
#define SECOND_REG 0x10
#define MINUTE_REG 0x11