nds32: Support AE3XX platform.

Support Andestech AE3xx platform: serial, timer device tree flow.

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

drivers/timer/Kconfig

@@ -75,9 +75,15 @@ config ARC_TIMER
 	  in U-Boot.
 
 config AG101P_TIMER
-	bool "Ag101p timer support"
-	depends on TIMER
+	bool "AG101P timer support"
+	depends on TIMER && NDS32
 	help
-	  Select this to enable a timer for Ag101p devices.
+	  Select this to enable a timer for AG01P devices.
+
+config AE3XX_TIMER
+	bool "AE3XX timer support"
+	depends on TIMER && NDS32
+	help
+	  Select this to enable a timer for AE3XX devices.
 
 endmenu

drivers/timer/Makefile

@@ -13,3 +13,4 @@ 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
+obj-$(CONFIG_AE3XX_TIMER) += ae3xx_timer.o

drivers/timer/ae3xx_timer.c

@@ -0,0 +1,117 @@
+/*
+ * Andestech ATCPIT100 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;
+
+#define REG32_TMR(x)	(*(unsigned long *)	((plat->regs) + (x>>2)))
+
+/*
+ * Definition of register offsets
+ */
+
+/* ID and Revision Register */
+#define ID_REV		0x0
+
+/* Configuration Register */
+#define CFG		0x10
+
+/* Interrupt Enable Register */
+#define INT_EN		0x14
+#define CH_INT_EN(c , i)	((1<<i)<<(4*c))
+
+/* Interrupt Status Register */
+#define INT_STA		0x18
+#define CH_INT_STA(c , i)	((1<<i)<<(4*c))
+
+/* Channel Enable Register */
+#define CH_EN		0x1C
+#define CH_TMR_EN(c , t)	((1<<t)<<(4*c))
+
+/* Ch n Control REgister */
+#define CH_CTL(n)	(0x20+0x10*n)
+/* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
+#define APB_CLK		(1<<3)
+/* Channel mode , bit 0~2 */
+#define TMR_32		1
+#define TMR_16		2
+#define TMR_8		3
+#define PWM		4
+
+#define CH_REL(n)	(0x24+0x10*n)
+#define CH_CNT(n)	(0x28+0x10*n)
+
+struct atctmr_timer_regs {
+	u32	id_rev;		/* 0x00 */
+	u32	reservd[3];	/* 0x04 ~ 0x0c */
+	u32	cfg;		/* 0x10 */
+	u32	int_en;		/* 0x14 */
+	u32	int_st;		/* 0x18 */
+	u32	ch_en;		/* 0x1c */
+	u32	ch0_ctrl;	/* 0x20 */
+	u32	ch0_reload;	/* 0x24 */
+	u32	ch0_cntr;	/* 0x28 */
+	u32	reservd1;	/* 0x2c */
+	u32	ch1_ctrl;	/* 0x30 */
+	u32	ch1_reload;	/* 0x34 */
+	u32	int_mask;	/* 0x38 */
+};
+
+struct atftmr_timer_platdata {
+	unsigned long *regs;
+};
+
+static int atftmr_timer_get_count(struct udevice *dev, u64 *count)
+{
+	struct atftmr_timer_platdata *plat = dev->platdata;
+	u32 val;
+	val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
+	*count = timer_conv_64(val);
+	return 0;
+}
+
+static int atctmr_timer_probe(struct udevice *dev)
+{
+	struct atftmr_timer_platdata *plat = dev->platdata;
+	REG32_TMR(CH_REL(1)) = 0xffffffff;
+	REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
+	REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
+	return 0;
+}
+
+static int atctme_timer_ofdata_to_platdata(struct udevice *dev)
+{
+	struct atftmr_timer_platdata *plat = dev_get_platdata(dev);
+	plat->regs = map_physmem(dev_get_addr(dev) , 0x100 , 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,atcpit100" },
+	{}
+};
+
+U_BOOT_DRIVER(altera_timer) = {
+	.name	= "ae3xx_timer",
+	.id	= UCLASS_TIMER,
+	.of_match = ag101p_timer_ids,
+	.ofdata_to_platdata = atctme_timer_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct atftmr_timer_platdata),
+	.probe = atctmr_timer_probe,
+	.ops	= &ag101p_timer_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};