arm: marvell: Rework timer.c to make it usable for other MVEBU platforms

This patch does the following:
- Rename defines and registers to not use kirkwood
- Remove unused defines
- Use clrsetbits() accessor functions
- Coding style cleanup
- Clear 25MHZ bit in timer controller register init for Armada XP

There is no functional change for kirkwood. At least not intentionally.

This will be used by the upcoming Armada XP support.

Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Luka Perkov <luka@openwrt.org>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>

arch/arm/include/asm/arch-kirkwood/soc.h

@@ -33,7 +33,7 @@
 #define KW_SPI_BASE			(KW_REGISTER(0x10600))
 #define KW_CPU_WIN_BASE			(KW_REGISTER(0x20000))
 #define KW_CPU_REG_BASE			(KW_REGISTER(0x20100))
-#define KW_TIMER_BASE			(KW_REGISTER(0x20300))
+#define MVEBU_TIMER_BASE			(KW_REGISTER(0x20300))
 #define KW_REG_PCIE_BASE		(KW_REGISTER(0x40000))
 #define KW_USB20_BASE			(KW_REGISTER(0x50000))
 #define KW_EGIGA0_BASE			(KW_REGISTER(0x72000))

arch/arm/mvebu-common/timer.c

@@ -9,73 +9,66 @@
 #include <asm/io.h>
 #include <asm/arch/soc.h>
 
-#define UBOOT_CNTR	0	/* counter to use for uboot timer */
-
-/* Timer reload and current value registers */
-struct kwtmr_val {
-	u32 reload;	/* Timer reload reg */
-	u32 val;	/* Timer value reg */
-};
-
-/* Timer registers */
-struct kwtmr_registers {
-	u32 ctrl;	/* Timer control reg */
-	u32 pad[3];
-	struct kwtmr_val tmr[2];
-	u32 wdt_reload;
-	u32 wdt_val;
-};
-
-struct kwtmr_registers *kwtmr_regs = (struct kwtmr_registers *)KW_TIMER_BASE;
+#define UBOOT_CNTR	0	/* counter to use for U-Boot timer */
 
 /*
  * ARM Timers Registers Map
  */
-#define CNTMR_CTRL_REG			&kwtmr_regs->ctrl
-#define CNTMR_RELOAD_REG(tmrnum)	&kwtmr_regs->tmr[tmrnum].reload
-#define CNTMR_VAL_REG(tmrnum)		&kwtmr_regs->tmr[tmrnum].val
+#define CNTMR_CTRL_REG			&tmr_regs->ctrl
+#define CNTMR_RELOAD_REG(tmrnum)	&tmr_regs->tmr[tmrnum].reload
+#define CNTMR_VAL_REG(tmrnum)		&tmr_regs->tmr[tmrnum].val
 
 /*
  * ARM Timers Control Register
  * CPU_TIMERS_CTRL_REG (CTCR)
  */
 #define CTCR_ARM_TIMER_EN_OFFS(cntr)	(cntr * 2)
-#define CTCR_ARM_TIMER_EN_MASK(cntr)	(1 << CTCR_ARM_TIMER_EN_OFFS)
 #define CTCR_ARM_TIMER_EN(cntr)		(1 << CTCR_ARM_TIMER_EN_OFFS(cntr))
-#define CTCR_ARM_TIMER_DIS(cntr)	(0 << CTCR_ARM_TIMER_EN_OFFS(cntr))
 
 #define CTCR_ARM_TIMER_AUTO_OFFS(cntr)	((cntr * 2) + 1)
-#define CTCR_ARM_TIMER_AUTO_MASK(cntr)	(1 << 1)
 #define CTCR_ARM_TIMER_AUTO_EN(cntr)	(1 << CTCR_ARM_TIMER_AUTO_OFFS(cntr))
-#define CTCR_ARM_TIMER_AUTO_DIS(cntr)	(0 << CTCR_ARM_TIMER_AUTO_OFFS(cntr))
 
-/*
- * ARM Timer\Watchdog Reload Register
- * CNTMR_RELOAD_REG (TRR)
- */
-#define TRG_ARM_TIMER_REL_OFFS		0
-#define TRG_ARM_TIMER_REL_MASK		0xffffffff
+/* Only Armada XP have the 25MHz enable bit (Kirkwood doesn't) */
+#if defined(CONFIG_ARMADA_XP)
+#define CTCR_ARM_TIMER_25MHZ_OFFS(cntr)	(cntr + 11)
+#define CTCR_ARM_TIMER_25MHZ(cntr)	(1 << CTCR_ARM_TIMER_25MHZ_OFFS(cntr))
+#else
+#define CTCR_ARM_TIMER_25MHZ(cntr)	0
+#endif
 
-/*
- * ARM Timer\Watchdog Register
- * CNTMR_VAL_REG (TVRG)
- */
-#define TVR_ARM_TIMER_OFFS		0
-#define TVR_ARM_TIMER_MASK		0xffffffff
-#define TVR_ARM_TIMER_MAX		0xffffffff
 #define TIMER_LOAD_VAL 			0xffffffff
 
-#define READ_TIMER			(readl(CNTMR_VAL_REG(UBOOT_CNTR)) /	\
-					 (CONFIG_SYS_TCLK / 1000))
+#define timestamp			gd->arch.tbl
+#define lastdec				gd->arch.lastinc
+
+/* Timer reload and current value registers */
+struct kwtmr_val {
+	u32 reload;	/* Timer reload reg */
+	u32 val;	/* Timer value reg */
+};
+
+/* Timer registers */
+struct kwtmr_registers {
+	u32 ctrl;	/* Timer control reg */
+	u32 pad[3];
+	struct kwtmr_val tmr[4];
+	u32 wdt_reload;
+	u32 wdt_val;
+};
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#define timestamp gd->arch.tbl
-#define lastdec gd->arch.lastinc
+static struct kwtmr_registers *tmr_regs =
+	(struct kwtmr_registers *)MVEBU_TIMER_BASE;
+
+static inline ulong read_timer(void)
+{
+	return readl(CNTMR_VAL_REG(UBOOT_CNTR))	/ (CONFIG_SYS_TCLK / 1000);
+}
 
 ulong get_timer_masked(void)
 {
-	ulong now = READ_TIMER;
+	ulong now = read_timer();
 
 	if (lastdec >= now) {
 		/* normal mode */
@@ -119,20 +112,17 @@ void __udelay(unsigned long usec)
  */
 int timer_init(void)
 {
-	unsigned int cntmrctrl;
-
 	/* load value into timer */
 	writel(TIMER_LOAD_VAL, CNTMR_RELOAD_REG(UBOOT_CNTR));
 	writel(TIMER_LOAD_VAL, CNTMR_VAL_REG(UBOOT_CNTR));
 
 	/* enable timer in auto reload mode */
-	cntmrctrl = readl(CNTMR_CTRL_REG);
-	cntmrctrl |= CTCR_ARM_TIMER_EN(UBOOT_CNTR);
-	cntmrctrl |= CTCR_ARM_TIMER_AUTO_EN(UBOOT_CNTR);
-	writel(cntmrctrl, CNTMR_CTRL_REG);
+	clrsetbits_le32(CNTMR_CTRL_REG, CTCR_ARM_TIMER_25MHZ(UBOOT_CNTR),
+			CTCR_ARM_TIMER_EN(UBOOT_CNTR) |
+			CTCR_ARM_TIMER_AUTO_EN(UBOOT_CNTR));
 
 	/* init the timestamp and lastdec value */
-	lastdec = READ_TIMER;
+	lastdec = read_timer();
 	timestamp = 0;
 
 	return 0;