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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Designware APB Timer driver
- *
- * Copyright (C) 2018 Marek Vasut <marex@denx.de>
- */
- #include <common.h>
- #include <dm.h>
- #include <clk.h>
- #include <malloc.h>
- #include <reset.h>
- #include <timer.h>
- #include <dm/device_compat.h>
- #include <asm/io.h>
- #include <asm/arch/timer.h>
- #define DW_APB_LOAD_VAL 0x0
- #define DW_APB_CURR_VAL 0x4
- #define DW_APB_CTRL 0x8
- struct dw_apb_timer_priv {
- fdt_addr_t regs;
- struct reset_ctl_bulk resets;
- };
- static u64 dw_apb_timer_get_count(struct udevice *dev)
- {
- struct dw_apb_timer_priv *priv = dev_get_priv(dev);
- /*
- * The DW APB counter counts down, but this function
- * requires the count to be incrementing. Invert the
- * result.
- */
- return timer_conv_64(~readl(priv->regs + DW_APB_CURR_VAL));
- }
- static int dw_apb_timer_probe(struct udevice *dev)
- {
- struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- struct dw_apb_timer_priv *priv = dev_get_priv(dev);
- struct clk clk;
- int ret;
- ret = reset_get_bulk(dev, &priv->resets);
- if (ret)
- dev_warn(dev, "Can't get reset: %d\n", ret);
- else
- reset_deassert_bulk(&priv->resets);
- ret = clk_get_by_index(dev, 0, &clk);
- if (ret)
- return ret;
- uc_priv->clock_rate = clk_get_rate(&clk);
- clk_free(&clk);
- /* init timer */
- writel(0xffffffff, priv->regs + DW_APB_LOAD_VAL);
- writel(0xffffffff, priv->regs + DW_APB_CURR_VAL);
- setbits_le32(priv->regs + DW_APB_CTRL, 0x3);
- return 0;
- }
- static int dw_apb_timer_of_to_plat(struct udevice *dev)
- {
- struct dw_apb_timer_priv *priv = dev_get_priv(dev);
- priv->regs = dev_read_addr(dev);
- return 0;
- }
- static int dw_apb_timer_remove(struct udevice *dev)
- {
- struct dw_apb_timer_priv *priv = dev_get_priv(dev);
- return reset_release_bulk(&priv->resets);
- }
- static const struct timer_ops dw_apb_timer_ops = {
- .get_count = dw_apb_timer_get_count,
- };
- static const struct udevice_id dw_apb_timer_ids[] = {
- { .compatible = "snps,dw-apb-timer" },
- {}
- };
- U_BOOT_DRIVER(dw_apb_timer) = {
- .name = "dw_apb_timer",
- .id = UCLASS_TIMER,
- .ops = &dw_apb_timer_ops,
- .probe = dw_apb_timer_probe,
- .of_match = dw_apb_timer_ids,
- .of_to_plat = dw_apb_timer_of_to_plat,
- .remove = dw_apb_timer_remove,
- .priv_auto = sizeof(struct dw_apb_timer_priv),
- };
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