stv0991: Add basic stv0991 architecture support

stv0991 architecture support added. It contains the support for
following blocks
- Timer
- uart

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
[trini: Add arch/arm/cpu/armv7/Makefile hunk]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index e419716..409e6f5 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -56,6 +56,7 @@
 obj-$(CONFIG_RMOBILE) += rmobile/
 obj-$(CONFIG_ARCH_S5PC1XX) += s5pc1xx/
 obj-$(CONFIG_SOCFPGA) += socfpga/
+obj-$(if $(filter stv0991,$(SOC)),y) += stv0991/
 obj-$(CONFIG_ARCH_SUNXI) += sunxi/
 obj-$(CONFIG_TEGRA20) += tegra20/
 obj-$(CONFIG_U8500) += u8500/
diff --git a/arch/arm/cpu/armv7/stv0991/Makefile b/arch/arm/cpu/armv7/stv0991/Makefile
new file mode 100644
index 0000000..95641d3
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/Makefile
@@ -0,0 +1,9 @@
+#
+# (C) Copyright 2014
+# Vikas Manocha, ST Microelectronics, vikas.manocha@stcom
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	:= timer.o clock.o pinmux.o reset.o
+obj-y	+= lowlevel.o
diff --git a/arch/arm/cpu/armv7/stv0991/clock.c b/arch/arm/cpu/armv7/stv0991/clock.c
new file mode 100644
index 0000000..aca6aba
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/clock.c
@@ -0,0 +1,27 @@
+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/stv0991_cgu.h>
+#include<asm/arch/stv0991_periph.h>
+
+static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
+				(struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
+
+void clock_setup(int peripheral)
+{
+	switch (peripheral) {
+	case UART_CLOCK_CFG:
+		writel(UART_CLK_CFG, &stv0991_cgu_regs->uart_freq);
+		break;
+	case ETH_CLOCK_CFG:
+		break;
+	default:
+		break;
+	}
+}
diff --git a/arch/arm/cpu/armv7/stv0991/lowlevel.S b/arch/arm/cpu/armv7/stv0991/lowlevel.S
new file mode 100644
index 0000000..6dafba3
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/lowlevel.S
@@ -0,0 +1,12 @@
+/*
+ * (C) Copyright 2014 stmicroelectronics
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+	mov	pc, lr
+ENDPROC(lowlevel_init)
diff --git a/arch/arm/cpu/armv7/stv0991/pinmux.c b/arch/arm/cpu/armv7/stv0991/pinmux.c
new file mode 100644
index 0000000..6d4414a
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/pinmux.c
@@ -0,0 +1,48 @@
+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm/io.h>
+#include <asm/arch/stv0991_creg.h>
+#include <asm/arch/stv0991_periph.h>
+#include <asm/arch/hardware.h>
+
+static struct stv0991_creg *const stv0991_creg = \
+			(struct stv0991_creg *)CREG_BASE_ADDR;
+
+int stv0991_pinmux_config(int peripheral)
+{
+	switch (peripheral) {
+	case UART_GPIOC_30_31:
+		/* SSDA/SSCL pad muxing to UART Rx/Dx */
+		writel((readl(&stv0991_creg->mux12) & GPIOC_31_MUX_MASK) |
+				CFG_GPIOC_31_UART_RX,
+				&stv0991_creg->mux12);
+		writel((readl(&stv0991_creg->mux12) & GPIOC_30_MUX_MASK) |
+				CFG_GPIOC_30_UART_TX,
+				&stv0991_creg->mux12);
+		/* SSDA/SSCL pad config to push pull*/
+		writel((readl(&stv0991_creg->cfg_pad6) & GPIOC_31_MODE_MASK) |
+				CFG_GPIOC_31_MODE_PP,
+				&stv0991_creg->cfg_pad6);
+		writel((readl(&stv0991_creg->cfg_pad6) & GPIOC_30_MODE_MASK) |
+				CFG_GPIOC_30_MODE_HIGH,
+				&stv0991_creg->cfg_pad6);
+		break;
+	case UART_GPIOB_16_17:
+		/* ethernet rx_6/7 to UART Rx/Dx */
+		writel((readl(&stv0991_creg->mux7) & GPIOB_17_MUX_MASK) |
+				CFG_GPIOB_17_UART_RX,
+				&stv0991_creg->mux7);
+		writel((readl(&stv0991_creg->mux7) & GPIOB_16_MUX_MASK) |
+				CFG_GPIOB_16_UART_TX,
+				&stv0991_creg->mux7);
+		break;
+	default:
+		break;
+	}
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/stv0991/reset.c b/arch/arm/cpu/armv7/stv0991/reset.c
new file mode 100644
index 0000000..3384b32
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/reset.c
@@ -0,0 +1,26 @@
+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/stv0991_wdru.h>
+void reset_cpu(ulong ignored)
+{
+	puts("System is going to reboot ...\n");
+	/*
+	 * This 1 second delay will allow the above message
+	 * to be printed before reset
+	 */
+	udelay((1000 * 1000));
+
+	/* Setting bit 1 of the WDRU unit will reset the SoC */
+	writel(WDRU_RST_SYS, &stv0991_wd_ru_ptr->wdru_ctrl1);
+
+	/* system will restart */
+	while (1)
+		;
+}
diff --git a/arch/arm/cpu/armv7/stv0991/timer.c b/arch/arm/cpu/armv7/stv0991/timer.c
new file mode 100644
index 0000000..8654b8b
--- /dev/null
+++ b/arch/arm/cpu/armv7/stv0991/timer.c
@@ -0,0 +1,114 @@
+/*
+ * (C) Copyright 2014
+ * Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch-stv0991/hardware.h>
+#include <asm/arch-stv0991/stv0991_cgu.h>
+#include <asm/arch-stv0991/stv0991_gpt.h>
+
+static struct stv0991_cgu_regs *const stv0991_cgu_regs = \
+				(struct stv0991_cgu_regs *) (CGU_BASE_ADDR);
+
+#define READ_TIMER()	(readl(&gpt1_regs_ptr->cnt) & GPT_FREE_RUNNING)
+#define GPT_RESOLUTION	(CONFIG_STV0991_HZ_CLOCK / CONFIG_STV0991_HZ)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define timestamp gd->arch.tbl
+#define lastdec gd->arch.lastinc
+
+int timer_init(void)
+{
+	/* Timer1 clock configuration */
+	writel(TIMER1_CLK_CFG, &stv0991_cgu_regs->tim_freq);
+	writel(readl(&stv0991_cgu_regs->cgu_enable_2) |
+			TIMER1_CLK_EN, &stv0991_cgu_regs->cgu_enable_2);
+
+	/* Stop the timer */
+	writel(readl(&gpt1_regs_ptr->cr1) & ~GPT_CR1_CEN, &gpt1_regs_ptr->cr1);
+	writel(GPT_PRESCALER_128, &gpt1_regs_ptr->psc);
+	/* Configure timer for auto-reload */
+	writel(readl(&gpt1_regs_ptr->cr1) | GPT_MODE_AUTO_RELOAD,
+			&gpt1_regs_ptr->cr1);
+
+	/* load value for free running */
+	writel(GPT_FREE_RUNNING, &gpt1_regs_ptr->arr);
+
+	/* start timer */
+	writel(readl(&gpt1_regs_ptr->cr1) | GPT_CR1_CEN,
+			&gpt1_regs_ptr->cr1);
+
+	/* Reset the timer */
+	lastdec = READ_TIMER();
+	timestamp = 0;
+
+	return 0;
+}
+
+/*
+ * timer without interrupts
+ */
+ulong get_timer(ulong base)
+{
+	return (get_timer_masked() / GPT_RESOLUTION) - base;
+}
+
+void __udelay(unsigned long usec)
+{
+	ulong tmo;
+	ulong start = get_timer_masked();
+	ulong tenudelcnt = CONFIG_STV0991_HZ_CLOCK / (1000 * 100);
+	ulong rndoff;
+
+	rndoff = (usec % 10) ? 1 : 0;
+
+	/* tenudelcnt timer tick gives 10 microsecconds delay */
+	tmo = ((usec / 10) + rndoff) * tenudelcnt;
+
+	while ((ulong) (get_timer_masked() - start) < tmo)
+		;
+}
+
+ulong get_timer_masked(void)
+{
+	ulong now = READ_TIMER();
+
+	if (now >= lastdec) {
+		/* normal mode */
+		timestamp += now - lastdec;
+	} else {
+		/* we have an overflow ... */
+		timestamp += now + GPT_FREE_RUNNING - lastdec;
+	}
+	lastdec = now;
+
+	return timestamp;
+}
+
+void udelay_masked(unsigned long usec)
+{
+	return udelay(usec);
+}
+
+/*
+ * This function is derived from PowerPC code (read timebase as long long).
+ * On ARM it just returns the timer value.
+ */
+unsigned long long get_ticks(void)
+{
+	return get_timer(0);
+}
+
+/*
+ * This function is derived from PowerPC code (timebase clock frequency).
+ * On ARM it returns the number of timer ticks per second.
+ */
+ulong get_tbclk(void)
+{
+	return CONFIG_STV0991_HZ;
+}