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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
233 lines
5.3 KiB
C
233 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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/*
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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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/**
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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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