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Tracing is typically enabled by the time driver model starts up, so there is no point in adding a 'notrace' to the timer-init function. However, once the driver model timer is enabled, we do need to be able to access the timer's private data when reading the timer, so add it to the core function needed for that. Update the function's documentation while we are here. Signed-off-by: Simon Glass <sjg@chromium.org>
195 lines
4.2 KiB
C
195 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
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*/
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#define LOG_CATEGORY UCLASS_TIMER
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#include <common.h>
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#include <clk.h>
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#include <cpu.h>
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#include <dm.h>
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#include <asm/global_data.h>
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#include <dm/lists.h>
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#include <dm/device_compat.h>
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#include <dm/device-internal.h>
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#include <dm/root.h>
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#include <errno.h>
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#include <init.h>
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#include <timer.h>
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#include <linux/err.h>
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#include <relocate.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Implement a timer uclass to work with lib/time.c. The timer is usually
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* a 32/64 bits free-running up counter. The get_rate() method is used to get
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* the input clock frequency of the timer. The get_count() method is used
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* to get the current 64 bits count value. If the hardware is counting down,
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* the value should be inversed inside the method. There may be no real
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* tick, and no timer interrupt.
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*/
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int notrace timer_get_count(struct udevice *dev, u64 *count)
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{
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struct timer_ops *ops = timer_get_ops(dev);
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if (!ops->get_count)
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return -ENOSYS;
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*count = ops->get_count(dev);
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return 0;
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}
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unsigned long notrace timer_get_rate(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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return uc_priv->clock_rate;
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}
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static int timer_pre_probe(struct udevice *dev)
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{
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if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC) &&
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(gd->flags & GD_FLG_RELOC)) {
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struct timer_ops *ops = timer_get_ops(dev);
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static int reloc_done;
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if (!reloc_done) {
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if (ops->get_count)
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MANUAL_RELOC(ops->get_count);
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reloc_done++;
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}
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}
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if (CONFIG_IS_ENABLED(OF_REAL)) {
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct clk timer_clk;
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int err;
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ulong ret;
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/*
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* It is possible that a timer device has a null ofnode
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*/
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if (!dev_has_ofnode(dev))
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return 0;
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err = clk_get_by_index(dev, 0, &timer_clk);
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if (!err) {
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ret = clk_get_rate(&timer_clk);
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if (IS_ERR_VALUE(ret))
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return ret;
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uc_priv->clock_rate = ret;
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} else {
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uc_priv->clock_rate =
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dev_read_u32_default(dev, "clock-frequency", 0);
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}
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}
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return 0;
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}
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static int timer_post_probe(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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if (!uc_priv->clock_rate)
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return -EINVAL;
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return 0;
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}
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#if CONFIG_IS_ENABLED(CPU)
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int timer_timebase_fallback(struct udevice *dev)
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{
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struct udevice *cpu;
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struct cpu_plat *cpu_plat;
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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/* Did we get our clock rate from the device tree? */
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if (uc_priv->clock_rate)
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return 0;
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/* Fall back to timebase-frequency */
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dev_dbg(dev, "missing clocks or clock-frequency property; falling back on timebase-frequency\n");
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cpu = cpu_get_current_dev();
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if (!cpu)
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return -ENODEV;
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cpu_plat = dev_get_parent_plat(cpu);
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if (!cpu_plat)
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return -ENODEV;
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uc_priv->clock_rate = cpu_plat->timebase_freq;
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return 0;
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}
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#endif
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u64 timer_conv_64(u32 count)
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{
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/* increment tbh if tbl has rolled over */
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if (count < gd->timebase_l)
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gd->timebase_h++;
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gd->timebase_l = count;
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return ((u64)gd->timebase_h << 32) | gd->timebase_l;
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}
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int dm_timer_init(void)
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{
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struct udevice *dev = NULL;
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__maybe_unused ofnode node;
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int ret;
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if (gd->timer)
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return 0;
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/*
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* Directly access gd->dm_root to suppress error messages, if the
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* virtual root driver does not yet exist.
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*/
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if (gd->dm_root == NULL)
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return -EAGAIN;
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if (CONFIG_IS_ENABLED(OF_REAL)) {
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/* Check for a chosen timer to be used for tick */
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node = ofnode_get_chosen_node("tick-timer");
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if (ofnode_valid(node) &&
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uclass_get_device_by_ofnode(UCLASS_TIMER, node, &dev)) {
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/*
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* If the timer is not marked to be bound before
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* relocation, bind it anyway.
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*/
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if (!lists_bind_fdt(dm_root(), node, &dev, NULL, false)) {
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ret = device_probe(dev);
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if (ret)
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return ret;
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}
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}
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}
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if (!dev) {
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/* Fall back to the first available timer */
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ret = uclass_first_device_err(UCLASS_TIMER, &dev);
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if (ret)
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return ret;
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}
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if (dev) {
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gd->timer = dev;
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return 0;
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}
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return -ENODEV;
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}
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UCLASS_DRIVER(timer) = {
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.id = UCLASS_TIMER,
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.name = "timer",
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.pre_probe = timer_pre_probe,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.post_probe = timer_post_probe,
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.per_device_auto = sizeof(struct timer_dev_priv),
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};
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