arm: Kirkwood: Basic SOCs support
Kirkwood family controllers are highly integrated SOCs
based on Feroceon-88FR131/Sheeva-88SV131/arm926ejs cpu core.
SOC versions supported:-
1) 88F6281-A0 define CONFIG_KW88F6281_A0
2) 88F6192-A0 define CONFIG_KW88F6192_A0
Other supported features:-
1) get_random_hex() fucntion
2) PCI Express port initialization
3) NS16550 driver support
Contributors:
Yotam Admon <yotam@marvell.com>
Michael Blostein <michaelbl@marvell.com
Reviewed-by: Ronen Shitrit <rshitrit@marvell.com>
Acked-by: Stefan Rose <sr@denx.de>
Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/cpu/arm926ejs/kirkwood/timer.c b/cpu/arm926ejs/kirkwood/timer.c
new file mode 100644
index 0000000..817ff42
--- /dev/null
+++ b/cpu/arm926ejs/kirkwood/timer.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) Marvell International Ltd. and its affiliates
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <asm/arch/kirkwood.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;
+
+/*
+ * 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
+
+/*
+ * 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
+
+/*
+ * 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))
+
+static ulong timestamp;
+static ulong lastdec;
+
+void reset_timer_masked(void)
+{
+ /* reset time */
+ lastdec = READ_TIMER;
+ timestamp = 0;
+}
+
+ulong get_timer_masked(void)
+{
+ ulong now = READ_TIMER;
+
+ if (lastdec >= now) {
+ /* normal mode */
+ timestamp += lastdec - now;
+ } else {
+ /* we have an overflow ... */
+ timestamp += lastdec +
+ (TIMER_LOAD_VAL / (CONFIG_SYS_TCLK / 1000)) - now;
+ }
+ lastdec = now;
+
+ return timestamp;
+}
+
+void reset_timer(void)
+{
+ reset_timer_masked();
+}
+
+ulong get_timer(ulong base)
+{
+ return get_timer_masked() - base;
+}
+
+void set_timer(ulong t)
+{
+ timestamp = t;
+}
+
+void udelay(unsigned long usec)
+{
+ uint current;
+ ulong delayticks;
+
+ current = readl(CNTMR_VAL_REG(UBOOT_CNTR));
+ delayticks = (usec * (CONFIG_SYS_TCLK / 1000000));
+
+ if (current < delayticks) {
+ delayticks -= current;
+ while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) < current) ;
+ while ((TIMER_LOAD_VAL - delayticks) <
+ readl(CNTMR_VAL_REG(UBOOT_CNTR))) ;
+ } else {
+ while (readl(CNTMR_VAL_REG(UBOOT_CNTR)) >
+ (current - delayticks)) ;
+ }
+}
+
+/*
+ * init the counter
+ */
+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);
+
+ /* init the timestamp and lastdec value */
+ reset_timer_masked();
+
+ return 0;
+}