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@@ -0,0 +1,92 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Renesas RZ/A1 R7S72100 OSTM Timer driver
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+ *
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+ * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
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+ */
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+
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+#include <common.h>
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+#include <asm/io.h>
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+#include <dm.h>
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+#include <clk.h>
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+#include <timer.h>
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+
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+#define OSTM_CMP 0x00
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+#define OSTM_CNT 0x04
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+#define OSTM_TE 0x10
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+#define OSTM_TS 0x14
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+#define OSTM_TT 0x18
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+#define OSTM_CTL 0x20
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+#define OSTM_CTL_D BIT(1)
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+struct ostm_priv {
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+ fdt_addr_t regs;
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+};
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+
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+static int ostm_get_count(struct udevice *dev, u64 *count)
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+{
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+ struct ostm_priv *priv = dev_get_priv(dev);
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+
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+ *count = timer_conv_64(readl(priv->regs + OSTM_CNT));
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+
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+ return 0;
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+}
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+
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+static int ostm_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 ostm_priv *priv = dev_get_priv(dev);
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+#if CONFIG_IS_ENABLED(CLK)
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+ struct clk clk;
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+ int ret;
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+
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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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+
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+ uc_priv->clock_rate = clk_get_rate(&clk);
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+
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+ clk_free(&clk);
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+#else
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+ uc_priv->clock_rate = CONFIG_SYS_CLK_FREQ / 2;
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+#endif
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+
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+ readb(priv->regs + OSTM_CTL);
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+ writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
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+
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+ setbits_8(priv->regs + OSTM_TT, BIT(0));
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+ writel(0xffffffff, priv->regs + OSTM_CMP);
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+ setbits_8(priv->regs + OSTM_TS, BIT(0));
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+
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+ return 0;
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+}
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+
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+static int ostm_ofdata_to_platdata(struct udevice *dev)
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+{
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+ struct ostm_priv *priv = dev_get_priv(dev);
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+
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+ priv->regs = dev_read_addr(dev);
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+
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+ return 0;
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+}
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+
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+static const struct timer_ops ostm_ops = {
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+ .get_count = ostm_get_count,
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+};
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+
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+static const struct udevice_id ostm_ids[] = {
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+ { .compatible = "renesas,ostm" },
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+ {}
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+};
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+
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+U_BOOT_DRIVER(ostm_timer) = {
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+ .name = "ostm-timer",
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+ .id = UCLASS_TIMER,
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+ .ops = &ostm_ops,
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+ .probe = ostm_probe,
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+ .of_match = ostm_ids,
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+ .ofdata_to_platdata = ostm_ofdata_to_platdata,
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+ .priv_auto_alloc_size = sizeof(struct ostm_priv),
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+};
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