Merge branch 'next'

Bring in the assorted changes that have been staged in the 'next' branch
prior to release.

Signed-off-by: Tom Rini <[email protected]>

6 files changed, 173 insertions, 22 deletions

diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig
index 637024445c1..f8fa4aa71f4 100644
--- a/drivers/timer/Kconfig
+++ b/drivers/timer/Kconfig
@@ -146,8 +146,8 @@ config RISCV_TIMER
 	bool "RISC-V timer support"
 	depends on TIMER && RISCV
 	help
-	  Select this to enable support for the timer as defined
-	  by the RISC-V privileged architecture spec.
+	  Select this to enable support for a generic RISC-V S-Mode timer
+	  driver.
 
 config ROCKCHIP_TIMER
 	bool "Rockchip timer support"
@@ -213,4 +213,11 @@ config MTK_TIMER
 	  Select this to enable support for the timer found on
 	  MediaTek devices.
 
+config MCHP_PIT64B_TIMER
+	bool "Microchip 64-bit periodic interval timer support"
+	depends on TIMER
+	help
+	  Select this to enable support for Microchip 64-bit periodic
+	  interval timer.
+
 endmenu
diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile
index c22ffebcdec..3a4d74b996b 100644
--- a/drivers/timer/Makefile
+++ b/drivers/timer/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_STI_TIMER)		+= sti-timer.o
 obj-$(CONFIG_STM32_TIMER)	+= stm32_timer.o
 obj-$(CONFIG_X86_TSC_TIMER)	+= tsc_timer.o
 obj-$(CONFIG_MTK_TIMER)		+= mtk_timer.o
+obj-$(CONFIG_MCHP_PIT64B_TIMER)	+= mchp-pit64b-timer.o
diff --git a/drivers/timer/mchp-pit64b-timer.c b/drivers/timer/mchp-pit64b-timer.c
new file mode 100644
index 00000000000..ead8c9b84ad
--- /dev/null
+++ b/drivers/timer/mchp-pit64b-timer.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 64-bit Periodic Interval Timer driver
+ *
+ * Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+ *
+ * Author: Claudiu Beznea <[email protected]>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <timer.h>
+#include <asm/io.h>
+
+#define MCHP_PIT64B_CR			0x00	/* Control Register */
+#define		MCHP_PIT64B_CR_START	BIT(0)
+#define		MCHP_PIT64B_CR_SWRST	BIT(8)
+#define MCHP_PIT64B_MR			0x04	/* Mode Register */
+#define		MCHP_PIT64B_MR_CONT	BIT(0)
+#define MCHP_PIT64B_LSB_PR		0x08	/* LSB Period Register */
+#define MCHP_PIT64B_MSB_PR		0x0C	/* MSB Period Register */
+#define MCHP_PIT64B_TLSBR		0x20	/* Timer LSB Register */
+#define MCHP_PIT64B_TMSBR		0x24	/* Timer MSB Register */
+
+struct mchp_pit64b_priv {
+	void __iomem *base;
+};
+
+static int mchp_pit64b_get_count(struct udevice *dev, u64 *count)
+{
+	struct mchp_pit64b_priv *priv = dev_get_priv(dev);
+
+	u32 lsb = readl(priv->base + MCHP_PIT64B_TLSBR);
+	u32 msb = readl(priv->base + MCHP_PIT64B_TMSBR);
+
+	*count = ((u64)msb << 32) | lsb;
+
+	return 0;
+}
+
+static int mchp_pit64b_probe(struct udevice *dev)
+{
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct mchp_pit64b_priv *priv = dev_get_priv(dev);
+	struct clk clk;
+	ulong rate;
+	int ret;
+
+	priv->base = dev_read_addr_ptr(dev);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(&clk);
+	if (ret)
+		return ret;
+
+	rate = clk_get_rate(&clk);
+	if (!rate) {
+		clk_disable(&clk);
+		return -ENOTSUPP;
+	}
+
+	/* Reset the timer in case it was used by previous bootloaders. */
+	writel(MCHP_PIT64B_CR_SWRST, priv->base + MCHP_PIT64B_CR);
+
+	/*
+	 * Use highest prescaller (for a peripheral clock running at 200MHz
+	 * this will lead to the timer running at 12.5MHz) and continuous mode.
+	 */
+	writel((15 << 8) | MCHP_PIT64B_MR_CONT, priv->base + MCHP_PIT64B_MR);
+	uc_priv->clock_rate = rate / 16;
+
+	/*
+	 * Simulate free running counter by setting max values to period
+	 * registers.
+	 */
+	writel(~0UL, priv->base + MCHP_PIT64B_MSB_PR);
+	writel(~0UL, priv->base + MCHP_PIT64B_LSB_PR);
+
+	/* Start the timer. */
+	writel(MCHP_PIT64B_CR_START, priv->base + MCHP_PIT64B_CR);
+
+	return 0;
+}
+
+static const struct timer_ops mchp_pit64b_ops = {
+	.get_count = mchp_pit64b_get_count,
+};
+
+static const struct udevice_id mchp_pit64b_ids[] = {
+	{ .compatible = "microchip,sam9x60-pit64b", },
+	{ .compatible = "microchip,sama7g5-pit64b", },
+	{ }
+};
+
+U_BOOT_DRIVER(mchp_pit64b) = {
+	.name	= "mchp-pit64b",
+	.id	= UCLASS_TIMER,
+	.of_match = mchp_pit64b_ids,
+	.priv_auto_alloc_size = sizeof(struct mchp_pit64b_priv),
+	.probe	= mchp_pit64b_probe,
+	.ops	= &mchp_pit64b_ops,
+	.flags	= DM_FLAG_PRE_RELOC,
+};
diff --git a/drivers/timer/riscv_timer.c b/drivers/timer/riscv_timer.c
index 9f9f070e0b3..449fcfcfd59 100644
--- a/drivers/timer/riscv_timer.c
+++ b/drivers/timer/riscv_timer.c
@@ -1,36 +1,37 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
+ * Copyright (C) 2020, Sean Anderson <[email protected]>
  * Copyright (C) 2018, Bin Meng <[email protected]>
+ * Copyright (C) 2018, Anup Patel <[email protected]>
+ * Copyright (C) 2012 Regents of the University of California
  *
- * RISC-V privileged architecture defined generic timer driver
+ * RISC-V architecturally-defined generic timer driver
  *
- * This driver relies on RISC-V platform codes to provide the essential API
- * riscv_get_time() which is supposed to return the timer counter as defined
- * by the RISC-V privileged architecture spec.
- *
- * This driver can be used in both M-mode and S-mode U-Boot.
+ * This driver provides generic timer support for S-mode U-Boot.
  */
 
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <timer.h>
-#include <asm/io.h>
-
-/**
- * riscv_get_time() - get the timer counter
- *
- * Platform codes should provide this API in order to make this driver function.
- *
- * @time:	the 64-bit timer count  as defined by the RISC-V privileged
- *		architecture spec.
- * @return:	0 on success, -ve on error.
- */
-extern int riscv_get_time(u64 *time);
+#include <asm/csr.h>
 
 static int riscv_timer_get_count(struct udevice *dev, u64 *count)
 {
-	return riscv_get_time(count);
+	if (IS_ENABLED(CONFIG_64BIT)) {
+		*count = csr_read(CSR_TIME);
+	} else {
+		u32 hi, lo;
+
+		do {
+			hi = csr_read(CSR_TIMEH);
+			lo = csr_read(CSR_TIME);
+		} while (hi != csr_read(CSR_TIMEH));
+
+		*count = ((u64)hi << 32) | lo;
+	}
+
+	return 0;
 }
 
 static int riscv_timer_probe(struct udevice *dev)
diff --git a/drivers/timer/sandbox_timer.c b/drivers/timer/sandbox_timer.c
index 5228486082c..6a503c2f153 100644
--- a/drivers/timer/sandbox_timer.c
+++ b/drivers/timer/sandbox_timer.c
@@ -40,7 +40,9 @@ static int sandbox_timer_probe(struct udevice *dev)
 {
 	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 
-	if (!uc_priv->clock_rate)
+	if (dev_read_bool(dev, "sandbox,timebase-frequency-fallback"))
+		return timer_timebase_fallback(dev);
+	else if (!uc_priv->clock_rate)
 		uc_priv->clock_rate = SANDBOX_TIMER_RATE;
 
 	return 0;
diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
index 14dde950a18..e9802c8b43e 100644
--- a/drivers/timer/timer-uclass.c
+++ b/drivers/timer/timer-uclass.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <cpu.h>
 #include <dm.h>
 #include <init.h>
 #include <dm/lists.h>
@@ -79,6 +80,36 @@ static int timer_post_probe(struct udevice *dev)
 	return 0;
 }
 
+/*
+ * TODO: should be CONFIG_IS_ENABLED(CPU), but the SPL config has _SUPPORT on
+ * the end...
+ */
+#if defined(CONFIG_CPU) || defined(CONFIG_SPL_CPU_SUPPORT)
+int timer_timebase_fallback(struct udevice *dev)
+{
+	struct udevice *cpu;
+	struct cpu_platdata *cpu_plat;
+	struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	/* Did we get our clock rate from the device tree? */
+	if (uc_priv->clock_rate)
+		return 0;
+
+	/* Fall back to timebase-frequency */
+	dev_dbg(dev, "missing clocks or clock-frequency property; falling back on timebase-frequency\n");
+	cpu = cpu_get_current_dev();
+	if (!cpu)
+		return -ENODEV;
+
+	cpu_plat = dev_get_parent_platdata(cpu);
+	if (!cpu_plat)
+		return -ENODEV;
+
+	uc_priv->clock_rate = cpu_plat->timebase_freq;
+	return 0;
+}
+#endif
+
 u64 timer_conv_64(u32 count)
 {
 	/* increment tbh if tbl has rolled over */