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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Designware APB Timer driver
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*
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* Copyright (C) 2018 Marek Vasut <marex@denx.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <clk.h>
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#include <malloc.h>
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#include <reset.h>
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#include <timer.h>
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#include <dm/device_compat.h>
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#include <asm/io.h>
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#include <asm/arch/timer.h>
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#define DW_APB_LOAD_VAL 0x0
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#define DW_APB_CURR_VAL 0x4
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#define DW_APB_CTRL 0x8
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struct dw_apb_timer_priv {
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fdt_addr_t regs;
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struct reset_ctl_bulk resets;
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};
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static u64 dw_apb_timer_get_count(struct udevice *dev)
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{
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struct dw_apb_timer_priv *priv = dev_get_priv(dev);
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/*
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* The DW APB counter counts down, but this function
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* requires the count to be incrementing. Invert the
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* result.
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*/
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return timer_conv_64(~readl(priv->regs + DW_APB_CURR_VAL));
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}
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static int dw_apb_timer_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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struct dw_apb_timer_priv *priv = dev_get_priv(dev);
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struct clk clk;
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int ret;
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ret = reset_get_bulk(dev, &priv->resets);
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if (ret)
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dev_warn(dev, "Can't get reset: %d\n", ret);
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else
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reset_deassert_bulk(&priv->resets);
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret)
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return ret;
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uc_priv->clock_rate = clk_get_rate(&clk);
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clk_free(&clk);
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/* init timer */
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writel(0xffffffff, priv->regs + DW_APB_LOAD_VAL);
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writel(0xffffffff, priv->regs + DW_APB_CURR_VAL);
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setbits_le32(priv->regs + DW_APB_CTRL, 0x3);
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return 0;
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}
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static int dw_apb_timer_ofdata_to_platdata(struct udevice *dev)
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{
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struct dw_apb_timer_priv *priv = dev_get_priv(dev);
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priv->regs = dev_read_addr(dev);
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return 0;
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}
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static int dw_apb_timer_remove(struct udevice *dev)
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{
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struct dw_apb_timer_priv *priv = dev_get_priv(dev);
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return reset_release_bulk(&priv->resets);
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}
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static const struct timer_ops dw_apb_timer_ops = {
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.get_count = dw_apb_timer_get_count,
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};
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static const struct udevice_id dw_apb_timer_ids[] = {
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{ .compatible = "snps,dw-apb-timer" },
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{}
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};
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U_BOOT_DRIVER(dw_apb_timer) = {
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.name = "dw_apb_timer",
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.id = UCLASS_TIMER,
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.ops = &dw_apb_timer_ops,
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.probe = dw_apb_timer_probe,
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.of_match = dw_apb_timer_ids,
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.ofdata_to_platdata = dw_apb_timer_ofdata_to_platdata,
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.remove = dw_apb_timer_remove,
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.priv_auto = sizeof(struct dw_apb_timer_priv),
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};
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