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caaaf62ac8
To use this DM timer on socfpga as system tick, it needs to take itself out of reset. Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
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 <reset.h>
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#include <timer.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 int dw_apb_timer_get_count(struct udevice *dev, u64 *count)
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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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*count = timer_conv_64(~readl(priv->regs + DW_APB_CURR_VAL));
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return 0;
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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_alloc_size = sizeof(struct dw_apb_timer_priv),
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};
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