nds32: Support AG101P timer DM.

Support AG101P timer device tree flow.

Signed-off-by: rick <rick@andestech.com>

arch/nds32/cpu/n1213/ag101/timer.c

@@ -8,7 +8,7 @@
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
-
+#ifndef CONFIG_TIMER
 #include <common.h>
 #include <asm/io.h>
 #include <faraday/fttmr010.h>
@@ -189,3 +189,4 @@ ulong get_tbclk(void)
 	return CONFIG_SYS_CLK_FREQ;
 #endif
 }
+#endif /* CONFIG_TIMER */

arch/nds32/dts/ag101p.dts

@@ -13,6 +13,7 @@
 		/* bootargs = "console=ttyS0,38400n8 earlyprintk=uart8250-32bit,0x99600000 debug bootmem_debug memblock=debug loglevel=7"; */
 		bootargs = "console=ttyS0,38400n8 earlyprintk=uart8250-32bit,0x99600000 debug loglevel=7";
 		stdout-path = "uart0:38400n8";
+		tick-timer = &timer0;
 	};
 
 	memory@0 {
@@ -46,4 +47,11 @@
 		no-loopback-test = <1>;
 	};
 
+	timer0: timer@98400000 {
+		compatible = "andestech,attmr010";
+		reg = <0x98400000 0x1000>;
+		interrupts = <19 4>;
+		clock-frequency = <15000000>;
+	};
+
 };

configs/adp-ag101p_defconfig

@@ -18,3 +18,5 @@ CONFIG_OF_CONTROL=y
 CONFIG_DM=y
 CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y
+CONFIG_TIMER=y
+CONFIG_AG101P_TIMER=y

drivers/timer/Kconfig

@@ -74,4 +74,10 @@ config ARC_TIMER
 	  usually at least one of them exists. Either of them is supported
 	  in U-Boot.
 
+config AG101P_TIMER
+	bool "Ag101p timer support"
+	depends on TIMER
+	help
+	  Select this to enable a timer for Ag101p devices.
+
 endmenu

drivers/timer/Makefile

@@ -12,3 +12,4 @@ obj-$(CONFIG_OMAP_TIMER)	+= omap-timer.o
 obj-$(CONFIG_AST_TIMER)	+= ast_timer.o
 obj-$(CONFIG_STI_TIMER)		+= sti-timer.o
 obj-$(CONFIG_ARC_TIMER)	+= arc_timer.o
+obj-$(CONFIG_AG101P_TIMER) += ag101p_timer.o

drivers/timer/ag101p_timer.c

@@ -0,0 +1,122 @@
+/*
+ * Andestech ATFTMR010 timer driver
+ *
+ * (C) Copyright 2016
+ * Rick Chen, NDS32 Software Engineering, rick@andestech.com
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <linux/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Timer Control Register
+ */
+#define T3_UPDOWN	(1 << 11)
+#define T2_UPDOWN	(1 << 10)
+#define T1_UPDOWN	(1 << 9)
+#define T3_OFENABLE	(1 << 8)
+#define T3_CLOCK	(1 << 7)
+#define T3_ENABLE	(1 << 6)
+#define T2_OFENABLE	(1 << 5)
+#define T2_CLOCK	(1 << 4)
+#define T2_ENABLE	(1 << 3)
+#define T1_OFENABLE	(1 << 2)
+#define T1_CLOCK	(1 << 1)
+#define T1_ENABLE	(1 << 0)
+
+/*
+ * Timer Interrupt State & Mask Registers
+ */
+#define T3_OVERFLOW	(1 << 8)
+#define T3_MATCH2	(1 << 7)
+#define T3_MATCH1	(1 << 6)
+#define T2_OVERFLOW	(1 << 5)
+#define T2_MATCH2	(1 << 4)
+#define T2_MATCH1	(1 << 3)
+#define T1_OVERFLOW	(1 << 2)
+#define T1_MATCH2	(1 << 1)
+#define T1_MATCH1	(1 << 0)
+
+struct atftmr_timer_regs {
+	u32	t1_counter;		/* 0x00 */
+	u32	t1_load;		/* 0x04 */
+	u32	t1_match1;		/* 0x08 */
+	u32	t1_match2;		/* 0x0c */
+	u32	t2_counter;		/* 0x10 */
+	u32	t2_load;		/* 0x14 */
+	u32	t2_match1;		/* 0x18 */
+	u32	t2_match2;		/* 0x1c */
+	u32	t3_counter;		/* 0x20 */
+	u32	t3_load;		/* 0x24 */
+	u32	t3_match1;		/* 0x28 */
+	u32	t3_match2;		/* 0x2c */
+	u32	cr;			/* 0x30 */
+	u32	int_state;		/* 0x34 */
+	u32	int_mask;		/* 0x38 */
+};
+
+struct atftmr_timer_platdata {
+	struct atftmr_timer_regs *regs;
+};
+
+static int atftmr_timer_get_count(struct udevice *dev, u64 *count)
+{
+	struct atftmr_timer_platdata *plat = dev->platdata;
+	struct atftmr_timer_regs *const regs = plat->regs;
+	u32 val;
+	val = readl(&regs->t3_counter);
+	*count = timer_conv_64(val);
+	return 0;
+}
+
+static int atftmr_timer_probe(struct udevice *dev)
+{
+	struct atftmr_timer_platdata *plat = dev->platdata;
+	struct atftmr_timer_regs *const regs = plat->regs;
+	u32 cr;
+	writel(0, &regs->t3_load);
+	writel(0, &regs->t3_counter);
+	writel(TIMER_LOAD_VAL, &regs->t3_match1);
+	writel(TIMER_LOAD_VAL, &regs->t3_match2);
+	/* disable interrupts */
+	writel(T3_MATCH1|T3_MATCH2|T3_OVERFLOW , &regs->int_mask);
+	cr = readl(&regs->cr);
+	cr |= (T3_ENABLE|T3_UPDOWN);
+	writel(cr, &regs->cr);
+	return 0;
+}
+
+static int atftme_timer_ofdata_to_platdata(struct udevice *dev)
+{
+	struct atftmr_timer_platdata *plat = dev_get_platdata(dev);
+	plat->regs = map_physmem(dev_get_addr(dev),
+				 sizeof(struct atftmr_timer_regs),
+				 MAP_NOCACHE);
+	return 0;
+}
+
+static const struct timer_ops ag101p_timer_ops = {
+	.get_count = atftmr_timer_get_count,
+};
+
+static const struct udevice_id ag101p_timer_ids[] = {
+	{ .compatible = "andestech,attmr010" },
+	{}
+};
+
+U_BOOT_DRIVER(altera_timer) = {
+	.name	= "ag101p_timer",
+	.id	= UCLASS_TIMER,
+	.of_match = ag101p_timer_ids,
+	.ofdata_to_platdata = atftme_timer_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct atftmr_timer_platdata),
+	.probe = atftmr_timer_probe,
+	.ops	= &ag101p_timer_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};