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141 lines
3.0 KiB
141 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2015 Thomas Chou <[email protected]> |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <dm/lists.h> |
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#include <dm/device-internal.h> |
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#include <dm/root.h> |
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#include <clk.h> |
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#include <errno.h> |
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#include <timer.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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const struct timer_ops *ops = device_get_ops(dev); |
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if (!ops->get_count) |
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return -ENOSYS; |
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return ops->get_count(dev, count); |
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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->uclass_priv; |
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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 !CONFIG_IS_ENABLED(OF_PLATDATA) |
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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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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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#endif |
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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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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 notrace 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_PLATDATA) |
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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)) { |
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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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#endif |
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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_alloc_size = sizeof(struct timer_dev_priv), |
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};
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