mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-15 06:33:45 +09:00
236 lines
5.3 KiB
C
236 lines
5.3 KiB
C
![]() |
/*
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* Simulate an I2C real time clock
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*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* This is a test driver. It starts off with the current time of the machine,
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* but also supports setting the time, using an offset from the current
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* clock. This driver is only intended for testing, not accurate
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* time-keeping. It does not change the system time.
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <os.h>
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#include <rtc.h>
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#include <asm/rtc.h>
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#include <asm/test.h>
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#ifdef DEBUG
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#define debug_buffer print_buffer
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#else
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#define debug_buffer(x, ...)
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* struct sandbox_i2c_rtc_plat_data - platform data for the RTC
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*
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* @base_time: Base system time when RTC device was bound
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* @offset: RTC offset from current system time
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* @use_system_time: true to use system time, false to use @base_time
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* @reg: Register values
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*/
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struct sandbox_i2c_rtc_plat_data {
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long base_time;
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long offset;
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bool use_system_time;
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u8 reg[REG_COUNT];
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};
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struct sandbox_i2c_rtc {
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unsigned int offset_secs;
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};
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long sandbox_i2c_rtc_set_offset(struct udevice *dev, bool use_system_time,
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int offset)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
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long old_offset;
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old_offset = plat->offset;
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plat->use_system_time = use_system_time;
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if (offset != -1)
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plat->offset = offset;
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return old_offset;
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}
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long sandbox_i2c_rtc_get_set_base_time(struct udevice *dev, long base_time)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
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long old_base_time;
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old_base_time = plat->base_time;
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if (base_time != -1)
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plat->base_time = base_time;
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return old_base_time;
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}
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static void reset_time(struct udevice *dev)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
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struct rtc_time now;
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os_localtime(&now);
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plat->base_time = rtc_mktime(&now);
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plat->offset = 0;
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plat->use_system_time = true;
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}
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static int sandbox_i2c_rtc_get(struct udevice *dev, struct rtc_time *time)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
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struct rtc_time tm_now;
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long now;
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if (plat->use_system_time) {
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os_localtime(&tm_now);
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now = rtc_mktime(&tm_now);
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} else {
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now = plat->base_time;
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}
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return rtc_to_tm(now + plat->offset, time);
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}
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static int sandbox_i2c_rtc_set(struct udevice *dev, const struct rtc_time *time)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(dev);
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struct rtc_time tm_now;
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long now;
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if (plat->use_system_time) {
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os_localtime(&tm_now);
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now = rtc_mktime(&tm_now);
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} else {
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now = plat->base_time;
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}
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plat->offset = rtc_mktime(time) - now;
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return 0;
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}
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/* Update the current time in the registers */
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static int sandbox_i2c_rtc_prepare_read(struct udevice *emul)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
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struct rtc_time time;
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int ret;
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ret = sandbox_i2c_rtc_get(emul, &time);
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if (ret)
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return ret;
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plat->reg[REG_SEC] = time.tm_sec;
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plat->reg[REG_MIN] = time.tm_min;
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plat->reg[REG_HOUR] = time.tm_hour;
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plat->reg[REG_MDAY] = time.tm_mday;
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plat->reg[REG_MON] = time.tm_mon;
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plat->reg[REG_YEAR] = time.tm_year - 1900;
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plat->reg[REG_WDAY] = time.tm_wday;
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return 0;
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}
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static int sandbox_i2c_rtc_complete_write(struct udevice *emul)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
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struct rtc_time time;
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int ret;
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time.tm_sec = plat->reg[REG_SEC];
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time.tm_min = plat->reg[REG_MIN];
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time.tm_hour = plat->reg[REG_HOUR];
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time.tm_mday = plat->reg[REG_MDAY];
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time.tm_mon = plat->reg[REG_MON];
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time.tm_year = plat->reg[REG_YEAR] + 1900;
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time.tm_wday = plat->reg[REG_WDAY];
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ret = sandbox_i2c_rtc_set(emul, &time);
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if (ret)
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return ret;
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return 0;
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}
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static int sandbox_i2c_rtc_xfer(struct udevice *emul, struct i2c_msg *msg,
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int nmsgs)
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{
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struct sandbox_i2c_rtc_plat_data *plat = dev_get_platdata(emul);
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uint offset = 0;
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int ret;
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debug("\n%s\n", __func__);
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ret = sandbox_i2c_rtc_prepare_read(emul);
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if (ret)
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return ret;
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for (; nmsgs > 0; nmsgs--, msg++) {
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int len;
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u8 *ptr;
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len = msg->len;
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debug(" %s: msg->len=%d",
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msg->flags & I2C_M_RD ? "read" : "write",
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msg->len);
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if (msg->flags & I2C_M_RD) {
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debug(", offset %x, len %x: ", offset, len);
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/* Read the register */
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memcpy(msg->buf, plat->reg + offset, len);
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memset(msg->buf + len, '\xff', msg->len - len);
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debug_buffer(0, msg->buf, 1, msg->len, 0);
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} else if (len >= 1) {
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ptr = msg->buf;
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offset = *ptr++ & (REG_COUNT - 1);
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len--;
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debug(", set offset %x: ", offset);
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debug_buffer(0, msg->buf, 1, msg->len, 0);
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/* Write the register */
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memcpy(plat->reg + offset, ptr, len);
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if (offset == REG_RESET)
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reset_time(emul);
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}
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}
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ret = sandbox_i2c_rtc_complete_write(emul);
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if (ret)
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return ret;
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return 0;
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}
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struct dm_i2c_ops sandbox_i2c_rtc_emul_ops = {
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.xfer = sandbox_i2c_rtc_xfer,
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};
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static int sandbox_i2c_rtc_bind(struct udevice *dev)
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{
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reset_time(dev);
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return 0;
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}
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static const struct udevice_id sandbox_i2c_rtc_ids[] = {
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{ .compatible = "sandbox,i2c-rtc" },
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{ }
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};
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U_BOOT_DRIVER(sandbox_i2c_rtc_emul) = {
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.name = "sandbox_i2c_rtc_emul",
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.id = UCLASS_I2C_EMUL,
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.of_match = sandbox_i2c_rtc_ids,
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.bind = sandbox_i2c_rtc_bind,
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.priv_auto_alloc_size = sizeof(struct sandbox_i2c_rtc),
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.platdata_auto_alloc_size = sizeof(struct sandbox_i2c_rtc_plat_data),
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.ops = &sandbox_i2c_rtc_emul_ops,
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};
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