drivers: timer: Add in driver support for ADI SC5XX-family GP timer peripheral

Co-developed-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Signed-off-by: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
Co-developed-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Co-developed-by: Ian Roberts <ian.roberts@timesys.com>
Signed-off-by: Ian Roberts <ian.roberts@timesys.com>
Signed-off-by: Greg Malysa <greg.malysa@timesys.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 1de9cb7bcaffcf9cf2f495ac83442affe359e6d2..71b6d15acbb0c2325cdae84727abced4e04b8432 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -612,6 +612,7 @@ F:  arch/arm/include/asm/arch-adi/
 F:     arch/arm/mach-sc5xx/
 F:     drivers/clk/adi/
 F:     drivers/serial/serial_adi_uart4.c
+F:     drivers/timer/adi_sc5xx_timer.c
 F:     include/env/adi/
 
 ARM SNAPDRAGON

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 60519c3b536cda11a0794c9979bab3fca46489a4..6b1de82ae38dd78e57ef96a8200f7345275be49c 100644 (file)
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -50,6 +50,14 @@ config TIMER_EARLY
          use an early timer. These functions must be supported by your timer
          driver: timer_early_get_count() and timer_early_get_rate().
 
+config ADI_SC5XX_TIMER
+       bool "ADI ADSP-SC5xx Timer Support"
+       depends on TIMER && (SC57X || SC58X || SC59X || SC59X_64)
+       help
+         gptimer based timer support on ADI's ADSP-SC5xx platforms. Available
+         but not required on sc59x-64-based platforms (598 and similar).
+         Required on 32-bit platforms (sc57x, sc58x, sc594 and earlier).
+
 config ALTERA_TIMER
        bool "Altera timer support"
        depends on TIMER

diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index b93145e8d437097d3c3c8f5903e8732f9703fb41..fb95c8899e396a570e3c14a6f64132e4a33c6787 100644 (file)
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -3,6 +3,7 @@
 # Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
 
 obj-y += timer-uclass.o
+obj-$(CONFIG_ADI_SC5XX_TIMER) += adi_sc5xx_timer.o
 obj-$(CONFIG_ALTERA_TIMER)     += altera_timer.o
 obj-$(CONFIG_$(SPL_)ANDES_PLMT_TIMER) += andes_plmt_timer.o
 obj-$(CONFIG_ARC_TIMER)        += arc_timer.o

diff --git a/drivers/timer/adi_sc5xx_timer.c b/drivers/timer/adi_sc5xx_timer.c
new file mode 100644 (file)
index 0000000..11c0984
--- /dev/null
+++ b/drivers/timer/adi_sc5xx_timer.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (C) Copyright 2022 - Analog Devices, Inc.
+ *
+ * Written and/or maintained by Timesys Corporation
+ *
+ * Converted to driver model by Nathan Barrett-Morrison
+ *
+ * Author: Greg Malysa <greg.malysa@timesys.com>
+ * Additional Contact: Nathan Barrett-Morrison <nathan.morrison@timesys.com>
+ *
+ * dm timer implementation for ADI ADSP-SC5xx SoCs
+ *
+ */
+
+#include <clk.h>
+#include <dm.h>
+#include <timer.h>
+#include <asm/io.h>
+#include <dm/device_compat.h>
+#include <linux/compiler_types.h>
+
+/*
+ * Timer Configuration Register Bits
+ */
+#define TIMER_OUT_DIS       0x0800
+#define TIMER_PULSE_HI      0x0080
+#define TIMER_MODE_PWM_CONT 0x000c
+
+#define __BFP(m) u16 m; u16 __pad_##m
+
+struct gptimer3 {
+       __BFP(config);
+       u32 counter;
+       u32 period;
+       u32 width;
+       u32 delay;
+};
+
+struct gptimer3_group_regs {
+       __BFP(run);
+       __BFP(enable);
+       __BFP(disable);
+       __BFP(stop_cfg);
+       __BFP(stop_cfg_set);
+       __BFP(stop_cfg_clr);
+       __BFP(data_imsk);
+       __BFP(stat_imsk);
+       __BFP(tr_msk);
+       __BFP(tr_ie);
+       __BFP(data_ilat);
+       __BFP(stat_ilat);
+       __BFP(err_status);
+       __BFP(bcast_per);
+       __BFP(bcast_wid);
+       __BFP(bcast_dly);
+};
+
+#define MAX_TIM_LOAD   0xFFFFFFFF
+
+struct adi_gptimer_priv {
+       struct gptimer3_group_regs __iomem *timer_group;
+       struct gptimer3 __iomem *timer_base;
+       u32 prev;
+       u64 upper;
+};
+
+static u64 adi_gptimer_get_count(struct udevice *udev)
+{
+       struct adi_gptimer_priv *priv = dev_get_priv(udev);
+
+       u32 now = readl(&priv->timer_base->counter);
+
+       if (now < priv->prev)
+               priv->upper += (1ull << 32);
+
+       priv->prev = now;
+
+       return (priv->upper + (u64)now);
+}
+
+static const struct timer_ops adi_gptimer_ops = {
+       .get_count = adi_gptimer_get_count,
+};
+
+static int adi_gptimer_probe(struct udevice *udev)
+{
+       struct timer_dev_priv *uc_priv = dev_get_uclass_priv(udev);
+       struct adi_gptimer_priv *priv = dev_get_priv(udev);
+       struct clk clk;
+       u16 imask;
+       int ret;
+
+       priv->timer_group = dev_remap_addr_index(udev, 0);
+       priv->timer_base = dev_remap_addr_index(udev, 1);
+       priv->upper = 0;
+       priv->prev = 0;
+
+       if (!priv->timer_group || !priv->timer_base) {
+               dev_err(udev, "Missing timer_group or timer_base reg entries\n");
+               return -ENODEV;
+       }
+
+       ret = clk_get_by_index(udev, 0, &clk);
+       if (ret < 0) {
+               dev_err(udev, "Missing clock reference for timer\n");
+               return ret;
+       }
+
+       ret = clk_enable(&clk);
+       if (ret) {
+               dev_err(udev, "Failed to enable clock\n");
+               return ret;
+       }
+
+       uc_priv->clock_rate = clk_get_rate(&clk);
+
+       /* Enable timer */
+       writew(TIMER_OUT_DIS | TIMER_MODE_PWM_CONT | TIMER_PULSE_HI,
+              &priv->timer_base->config);
+       writel(MAX_TIM_LOAD, &priv->timer_base->period);
+       writel(MAX_TIM_LOAD - 1, &priv->timer_base->width);
+
+       /* We only use timer 0 in uboot */
+       imask = readw(&priv->timer_group->data_imsk);
+       imask &= ~(1 << 0);
+       writew(imask, &priv->timer_group->data_imsk);
+       writew((1 << 0), &priv->timer_group->enable);
+
+       return 0;
+}
+
+static const struct udevice_id adi_gptimer_ids[] = {
+       { .compatible = "adi,sc5xx-gptimer" },
+       { },
+};
+
+U_BOOT_DRIVER(adi_gptimer) = {
+       .name = "adi_gptimer",
+       .id = UCLASS_TIMER,
+       .of_match = adi_gptimer_ids,
+       .priv_auto = sizeof(struct adi_gptimer_priv),
+       .probe = adi_gptimer_probe,
+       .ops = &adi_gptimer_ops,
+};