timer: renesas: Add RZ/A1 R7S72100 OSTM timer driver

Add OSTM timer driver for RZ/A1 SoC. The IP is very different
from the R-Car Gen2/Gen3 one already present in the tree, hence
a custom driver.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Chris Brandt <chris.brandt@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index df37a798bdcb908730970d16bf26d0e810d5f330..5f4bc6edb67b256d3c097b0f50f088a34e2eebab 100644 (file)
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -110,6 +110,13 @@ config MPC83XX_TIMER
          Select this to enable support for the timer found on
          devices based on the MPC83xx family of SoCs.
 
+config RENESAS_OSTM_TIMER
+       bool "Renesas RZ/A1 R7S72100 OSTM Timer"
+       depends on TIMER
+       help
+         Enables support for the Renesas OSTM Timer driver.
+         This timer is present on Renesas RZ/A1 R7S72100 SoCs.
+
 config X86_TSC_TIMER_EARLY_FREQ
        int "x86 TSC timer frequency in MHz when used as the early timer"
        depends on X86_TSC_TIMER

diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index d0bf218b114f430f09ccfc2d9bc30e795db3fa93..fa35bea6c5b2ea6d920714d8f6bd593d40f87d54 100644 (file)
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_CADENCE_TTC_TIMER)       += cadence-ttc.o
 obj-$(CONFIG_DESIGNWARE_APB_TIMER)     += dw-apb-timer.o
 obj-$(CONFIG_MPC83XX_TIMER) += mpc83xx_timer.o
 obj-$(CONFIG_OMAP_TIMER)       += omap-timer.o
+obj-$(CONFIG_RENESAS_OSTM_TIMER) += ostm_timer.o
 obj-$(CONFIG_RISCV_TIMER) += riscv_timer.o
 obj-$(CONFIG_ROCKCHIP_TIMER) += rockchip_timer.o
 obj-$(CONFIG_SANDBOX_TIMER)    += sandbox_timer.o

diff --git a/drivers/timer/ostm_timer.c b/drivers/timer/ostm_timer.c
new file mode 100644 (file)
index 0000000..f0e2509
--- /dev/null
+++ b/drivers/timer/ostm_timer.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Renesas RZ/A1 R7S72100 OSTM Timer driver
+ *
+ * Copyright (C) 2019 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <clk.h>
+#include <timer.h>
+
+#define OSTM_CMP       0x00
+#define OSTM_CNT       0x04
+#define OSTM_TE                0x10
+#define OSTM_TS                0x14
+#define OSTM_TT                0x18
+#define OSTM_CTL       0x20
+#define OSTM_CTL_D     BIT(1)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct ostm_priv {
+       fdt_addr_t      regs;
+};
+
+static int ostm_get_count(struct udevice *dev, u64 *count)
+{
+       struct ostm_priv *priv = dev_get_priv(dev);
+
+       *count = timer_conv_64(readl(priv->regs + OSTM_CNT));
+
+       return 0;
+}
+
+static int ostm_probe(struct udevice *dev)
+{
+       struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+       struct ostm_priv *priv = dev_get_priv(dev);
+#if CONFIG_IS_ENABLED(CLK)
+       struct clk clk;
+       int ret;
+
+       ret = clk_get_by_index(dev, 0, &clk);
+       if (ret)
+               return ret;
+
+       uc_priv->clock_rate = clk_get_rate(&clk);
+
+       clk_free(&clk);
+#else
+       uc_priv->clock_rate = CONFIG_SYS_CLK_FREQ / 2;
+#endif
+
+       readb(priv->regs + OSTM_CTL);
+       writeb(OSTM_CTL_D, priv->regs + OSTM_CTL);
+
+       setbits_8(priv->regs + OSTM_TT, BIT(0));
+       writel(0xffffffff, priv->regs + OSTM_CMP);
+       setbits_8(priv->regs + OSTM_TS, BIT(0));
+
+       return 0;
+}
+
+static int ostm_ofdata_to_platdata(struct udevice *dev)
+{
+       struct ostm_priv *priv = dev_get_priv(dev);
+
+       priv->regs = dev_read_addr(dev);
+
+       return 0;
+}
+
+static const struct timer_ops ostm_ops = {
+       .get_count      = ostm_get_count,
+};
+
+static const struct udevice_id ostm_ids[] = {
+       { .compatible = "renesas,ostm" },
+       {}
+};
+
+U_BOOT_DRIVER(ostm_timer) = {
+       .name           = "ostm-timer",
+       .id             = UCLASS_TIMER,
+       .ops            = &ostm_ops,
+       .probe          = ostm_probe,
+       .of_match       = ostm_ids,
+       .ofdata_to_platdata = ostm_ofdata_to_platdata,
+       .priv_auto_alloc_size = sizeof(struct ostm_priv),
+};