18 files changed, 836 insertions, 0 deletions

diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefile
new file mode 100644
index 000000000000..397268c1b250
--- /dev/null
+++ b/arch/arm/mach-zynq/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the linux kernel.
+#
+
+# Common support
+obj-y				:= common.o timer.o
diff --git a/arch/arm/mach-zynq/Makefile.boot b/arch/arm/mach-zynq/Makefile.boot
new file mode 100644
index 000000000000..67039c3e0c48
--- /dev/null
+++ b/arch/arm/mach-zynq/Makefile.boot
@@ -0,0 +1,3 @@
+   zreladdr-y	:= 0x00008000
+params_phys-y	:= 0x00000100
+initrd_phys-y	:= 0x00800000
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c
new file mode 100644
index 000000000000..73e93687b81a
--- /dev/null
+++ b/arch/arm/mach-zynq/common.c
@@ -0,0 +1,118 @@
+/*
+ * This file contains common code that is intended to be used across
+ * boards so that it's not replicated.
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/cpumask.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach-types.h>
+#include <asm/page.h>
+#include <asm/hardware/gic.h>
+#include <asm/hardware/cache-l2x0.h>
+
+#include <mach/zynq_soc.h>
+#include <mach/clkdev.h>
+#include "common.h"
+
+static struct of_device_id zynq_of_bus_ids[] __initdata = {
+	{ .compatible = "simple-bus", },
+	{}
+};
+
+/**
+ * xilinx_init_machine() - System specific initialization, intended to be
+ *			   called from board specific initialization.
+ */
+static void __init xilinx_init_machine(void)
+{
+#ifdef CONFIG_CACHE_L2X0
+	/*
+	 * 64KB way size, 8-way associativity, parity disabled
+	 */
+	l2x0_init(PL310_L2CC_BASE, 0x02060000, 0xF0F0FFFF);
+#endif
+
+	of_platform_bus_probe(NULL, zynq_of_bus_ids, NULL);
+}
+
+/**
+ * xilinx_irq_init() - Interrupt controller initialization for the GIC.
+ */
+static void __init xilinx_irq_init(void)
+{
+	gic_init(0, 29, SCU_GIC_DIST_BASE, SCU_GIC_CPU_BASE);
+}
+
+/* The minimum devices needed to be mapped before the VM system is up and
+ * running include the GIC, UART and Timer Counter.
+ */
+
+static struct map_desc io_desc[] __initdata = {
+	{
+		.virtual	= TTC0_VIRT,
+		.pfn		= __phys_to_pfn(TTC0_PHYS),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= SCU_PERIPH_VIRT,
+		.pfn		= __phys_to_pfn(SCU_PERIPH_PHYS),
+		.length		= SZ_8K,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= PL310_L2CC_VIRT,
+		.pfn		= __phys_to_pfn(PL310_L2CC_PHYS),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+
+#ifdef CONFIG_DEBUG_LL
+	{
+		.virtual	= UART0_VIRT,
+		.pfn		= __phys_to_pfn(UART0_PHYS),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+#endif
+
+};
+
+/**
+ * xilinx_map_io() - Create memory mappings needed for early I/O.
+ */
+static void __init xilinx_map_io(void)
+{
+	iotable_init(io_desc, ARRAY_SIZE(io_desc));
+}
+
+static const char *xilinx_dt_match[] = {
+	"xlnx,zynq-ep107",
+	NULL
+};
+
+MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform")
+	.map_io		= xilinx_map_io,
+	.init_irq	= xilinx_irq_init,
+	.init_machine	= xilinx_init_machine,
+	.timer		= &xttcpss_sys_timer,
+	.dt_compat	= xilinx_dt_match,
+MACHINE_END
diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h
new file mode 100644
index 000000000000..a009644a1555
--- /dev/null
+++ b/arch/arm/mach-zynq/common.h
@@ -0,0 +1,24 @@
+/*
+ * This file contains common function prototypes to avoid externs
+ * in the c files.
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_ZYNQ_COMMON_H__
+#define __MACH_ZYNQ_COMMON_H__
+
+#include <asm/mach/time.h>
+
+extern struct sys_timer xttcpss_sys_timer;
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/clkdev.h b/arch/arm/mach-zynq/include/mach/clkdev.h
new file mode 100644
index 000000000000..c6e73d81a459
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/clkdev.h
@@ -0,0 +1,32 @@
+/*
+ * arch/arm/mach-zynq/include/mach/clkdev.h
+ *
+ *  Copyright (C) 2011 Xilinx, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#ifndef __MACH_CLKDEV_H__
+#define __MACH_CLKDEV_H__
+
+#include <plat/clock.h>
+
+struct clk {
+	unsigned long		rate;
+	const struct clk_ops	*ops;
+	const struct icst_params *params;
+	void __iomem		*vcoreg;
+};
+
+#define __clk_get(clk) ({ 1; })
+#define __clk_put(clk) do { } while (0)
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/debug-macro.S b/arch/arm/mach-zynq/include/mach/debug-macro.S
new file mode 100644
index 000000000000..9f664d5eb81d
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/debug-macro.S
@@ -0,0 +1,36 @@
+/* arch/arm/mach-zynq/include/mach/debug-macro.S
+ *
+ * Debugging macro include header
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <mach/zynq_soc.h>
+#include <mach/uart.h>
+
+		.macro	addruart, rp, rv
+		ldr	\rp, =LL_UART_PADDR	@ physical
+		ldr	\rv, =LL_UART_VADDR	@ virtual
+		.endm
+
+		.macro	senduart,rd,rx
+		str	\rd, [\rx, #UART_FIFO_OFFSET]	@ TXDATA
+		.endm
+
+		.macro	waituart,rd,rx
+		.endm
+
+		.macro	busyuart,rd,rx
+1002:		ldr	\rd, [\rx, #UART_SR_OFFSET]	@ get status register
+		tst	\rd, #UART_SR_TXFULL		@
+		bne	1002b			@ wait if FIFO is full
+		.endm
diff --git a/arch/arm/mach-zynq/include/mach/entry-macro.S b/arch/arm/mach-zynq/include/mach/entry-macro.S
new file mode 100644
index 000000000000..3cfc01b37461
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/entry-macro.S
@@ -0,0 +1,30 @@
+/*
+ * arch/arm/mach-zynq/include/mach/entry-macro.S
+ *
+ * Low-level IRQ helper macros
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * based on arch/plat-mxc/include/mach/entry-macro.S
+ *
+ *  Copyright (C) 2007 Lennert Buytenhek <buytenh@wantstofly.org>
+ *  Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <mach/hardware.h>
+#include <asm/hardware/entry-macro-gic.S>
+
+		.macro  disable_fiq
+		.endm
+
+		.macro  arch_ret_to_user, tmp1, tmp2
+		.endm
diff --git a/arch/arm/mach-zynq/include/mach/hardware.h b/arch/arm/mach-zynq/include/mach/hardware.h
new file mode 100644
index 000000000000..d558d8a94be7
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/hardware.h
@@ -0,0 +1,18 @@
+/* arch/arm/mach-zynq/include/mach/hardware.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_HARDWARE_H__
+#define __MACH_HARDWARE_H__
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/io.h b/arch/arm/mach-zynq/include/mach/io.h
new file mode 100644
index 000000000000..39d9885e0e9a
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/io.h
@@ -0,0 +1,33 @@
+/* arch/arm/mach-zynq/include/mach/io.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_IO_H__
+#define __MACH_IO_H__
+
+/* Allow IO space to be anywhere in the memory */
+
+#define IO_SPACE_LIMIT 0xffff
+
+/* IO address mapping macros, nothing special at this time but required */
+
+#ifdef __ASSEMBLER__
+#define IOMEM(x)		(x)
+#else
+#define IOMEM(x)		((void __force __iomem *)(x))
+#endif
+
+#define __io(a)			__typesafe_io(a)
+#define __mem_pci(a)		(a)
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/irqs.h b/arch/arm/mach-zynq/include/mach/irqs.h
new file mode 100644
index 000000000000..5fb04fd3bac8
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/irqs.h
@@ -0,0 +1,21 @@
+/* arch/arm/mach-zynq/include/mach/irqs.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_IRQS_H
+#define __MACH_IRQS_H
+
+#define ARCH_NR_GPIOS	118
+#define NR_IRQS		(128 + ARCH_NR_GPIOS)
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/memory.h b/arch/arm/mach-zynq/include/mach/memory.h
new file mode 100644
index 000000000000..35a92634dcc1
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/memory.h
@@ -0,0 +1,22 @@
+/* arch/arm/mach-zynq/include/mach/memory.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_MEMORY_H__
+#define __MACH_MEMORY_H__
+
+#include <asm/sizes.h>
+
+#define PLAT_PHYS_OFFSET	UL(0x0)
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/system.h b/arch/arm/mach-zynq/include/mach/system.h
new file mode 100644
index 000000000000..1b84d705c675
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/system.h
@@ -0,0 +1,28 @@
+/* arch/arm/mach-zynq/include/mach/system.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_SYSTEM_H__
+#define __MACH_SYSTEM_H__
+
+static inline void arch_idle(void)
+{
+	cpu_do_idle();
+}
+
+static inline void arch_reset(char mode, const char *cmd)
+{
+	/* Add architecture specific reset processing here */
+}
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/timex.h b/arch/arm/mach-zynq/include/mach/timex.h
new file mode 100644
index 000000000000..6c0245e42a5e
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/timex.h
@@ -0,0 +1,23 @@
+/* arch/arm/mach-zynq/include/mach/timex.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_TIMEX_H__
+#define __MACH_TIMEX_H__
+
+/* the following is needed for the system to build but will be removed
+   in the future, the value is not important but won't hurt
+*/
+#define CLOCK_TICK_RATE	(100 * HZ)
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/uart.h b/arch/arm/mach-zynq/include/mach/uart.h
new file mode 100644
index 000000000000..5c47c97156f3
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/uart.h
@@ -0,0 +1,25 @@
+/* arch/arm/mach-zynq/include/mach/uart.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_UART_H__
+#define __MACH_UART_H__
+
+#define UART_CR_OFFSET		0x00  /* Control Register [8:0] */
+#define UART_SR_OFFSET		0x2C  /* Channel Status [11:0] */
+#define UART_FIFO_OFFSET	0x30  /* FIFO [15:0] or [7:0] */
+
+#define UART_SR_TXFULL		0x00000010	/* TX FIFO full */
+#define UART_SR_TXEMPTY		0x00000008	/* TX FIFO empty */
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/uncompress.h b/arch/arm/mach-zynq/include/mach/uncompress.h
new file mode 100644
index 000000000000..af4e8447bfa3
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/uncompress.h
@@ -0,0 +1,51 @@
+/* arch/arm/mach-zynq/include/mach/uncompress.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_UNCOMPRESS_H__
+#define __MACH_UNCOMPRESS_H__
+
+#include <linux/io.h>
+#include <asm/processor.h>
+#include <mach/zynq_soc.h>
+#include <mach/uart.h>
+
+void arch_decomp_setup(void)
+{
+}
+
+static inline void flush(void)
+{
+	/*
+	 * Wait while the FIFO is not empty
+	 */
+	while (!(__raw_readl(IOMEM(LL_UART_PADDR + UART_SR_OFFSET)) &
+		UART_SR_TXEMPTY))
+		cpu_relax();
+}
+
+#define arch_decomp_wdog()
+
+static void putc(char ch)
+{
+	/*
+	 * Wait for room in the FIFO, then write the char into the FIFO
+	 */
+	while (__raw_readl(IOMEM(LL_UART_PADDR + UART_SR_OFFSET)) &
+		UART_SR_TXFULL)
+		cpu_relax();
+
+	__raw_writel(ch, IOMEM(LL_UART_PADDR + UART_FIFO_OFFSET));
+}
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/vmalloc.h b/arch/arm/mach-zynq/include/mach/vmalloc.h
new file mode 100644
index 000000000000..2398eff1e8b8
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/vmalloc.h
@@ -0,0 +1,20 @@
+/* arch/arm/mach-zynq/include/mach/vmalloc.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_VMALLOC_H__
+#define __MACH_VMALLOC_H__
+
+#define VMALLOC_END       0xE0000000UL
+
+#endif
diff --git a/arch/arm/mach-zynq/include/mach/zynq_soc.h b/arch/arm/mach-zynq/include/mach/zynq_soc.h
new file mode 100644
index 000000000000..d0d3f8fb06dd
--- /dev/null
+++ b/arch/arm/mach-zynq/include/mach/zynq_soc.h
@@ -0,0 +1,48 @@
+/* arch/arm/mach-zynq/include/mach/zynq_soc.h
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __MACH_XILINX_SOC_H__
+#define __MACH_XILINX_SOC_H__
+
+#define PERIPHERAL_CLOCK_RATE		2500000
+
+/* For now, all mappings are flat (physical = virtual)
+ */
+#define UART0_PHYS			0xE0000000
+#define UART0_VIRT			UART0_PHYS
+
+#define TTC0_PHYS			0xF8001000
+#define TTC0_VIRT			TTC0_PHYS
+
+#define PL310_L2CC_PHYS			0xF8F02000
+#define PL310_L2CC_VIRT			PL310_L2CC_PHYS
+
+#define SCU_PERIPH_PHYS			0xF8F00000
+#define SCU_PERIPH_VIRT			SCU_PERIPH_PHYS
+
+/* The following are intended for the devices that are mapped early */
+
+#define TTC0_BASE			IOMEM(TTC0_VIRT)
+#define SCU_PERIPH_BASE			IOMEM(SCU_PERIPH_VIRT)
+#define SCU_GIC_CPU_BASE		(SCU_PERIPH_BASE + 0x100)
+#define SCU_GIC_DIST_BASE		(SCU_PERIPH_BASE + 0x1000)
+#define PL310_L2CC_BASE			IOMEM(PL310_L2CC_VIRT)
+
+/*
+ * Mandatory for CONFIG_LL_DEBUG, UART is mapped virtual = physical
+ */
+#define LL_UART_PADDR	UART0_PHYS
+#define LL_UART_VADDR	UART0_VIRT
+
+#endif
diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c
new file mode 100644
index 000000000000..c2c96cc7d6e7
--- /dev/null
+++ b/arch/arm/mach-zynq/timer.c
@@ -0,0 +1,298 @@
+/*
+ * This file contains driver for the Xilinx PS Timer Counter IP.
+ *
+ *  Copyright (C) 2011 Xilinx
+ *
+ * based on arch/mips/kernel/time.c timer driver
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/io.h>
+
+#include <asm/mach/time.h>
+#include <mach/zynq_soc.h>
+#include "common.h"
+
+#define IRQ_TIMERCOUNTER0	42
+
+/*
+ * This driver configures the 2 16-bit count-up timers as follows:
+ *
+ * T1: Timer 1, clocksource for generic timekeeping
+ * T2: Timer 2, clockevent source for hrtimers
+ * T3: Timer 3, <unused>
+ *
+ * The input frequency to the timer module for emulation is 2.5MHz which is
+ * common to all the timer channels (T1, T2, and T3). With a pre-scaler of 32,
+ * the timers are clocked at 78.125KHz (12.8 us resolution).
+ *
+ * The input frequency to the timer module in silicon will be 200MHz. With the
+ * pre-scaler of 32, the timers are clocked at 6.25MHz (160ns resolution).
+ */
+#define XTTCPSS_CLOCKSOURCE	0	/* Timer 1 as a generic timekeeping */
+#define XTTCPSS_CLOCKEVENT	1	/* Timer 2 as a clock event */
+
+#define XTTCPSS_TIMER_BASE		TTC0_BASE
+#define XTTCPCC_EVENT_TIMER_IRQ		(IRQ_TIMERCOUNTER0 + 1)
+/*
+ * Timer Register Offset Definitions of Timer 1, Increment base address by 4
+ * and use same offsets for Timer 2
+ */
+#define XTTCPSS_CLK_CNTRL_OFFSET	0x00 /* Clock Control Reg, RW */
+#define XTTCPSS_CNT_CNTRL_OFFSET	0x0C /* Counter Control Reg, RW */
+#define XTTCPSS_COUNT_VAL_OFFSET	0x18 /* Counter Value Reg, RO */
+#define XTTCPSS_INTR_VAL_OFFSET		0x24 /* Interval Count Reg, RW */
+#define XTTCPSS_MATCH_1_OFFSET		0x30 /* Match 1 Value Reg, RW */
+#define XTTCPSS_MATCH_2_OFFSET		0x3C /* Match 2 Value Reg, RW */
+#define XTTCPSS_MATCH_3_OFFSET		0x48 /* Match 3 Value Reg, RW */
+#define XTTCPSS_ISR_OFFSET		0x54 /* Interrupt Status Reg, RO */
+#define XTTCPSS_IER_OFFSET		0x60 /* Interrupt Enable Reg, RW */
+
+#define XTTCPSS_CNT_CNTRL_DISABLE_MASK	0x1
+
+/* Setup the timers to use pre-scaling */
+
+#define TIMER_RATE (PERIPHERAL_CLOCK_RATE / 32)
+
+/**
+ * struct xttcpss_timer - This definition defines local timer structure
+ *
+ * @base_addr:	Base address of timer
+ **/
+struct xttcpss_timer {
+	void __iomem *base_addr;
+};
+
+static struct xttcpss_timer timers[2];
+static struct clock_event_device xttcpss_clockevent;
+
+/**
+ * xttcpss_set_interval - Set the timer interval value
+ *
+ * @timer:	Pointer to the timer instance
+ * @cycles:	Timer interval ticks
+ **/
+static void xttcpss_set_interval(struct xttcpss_timer *timer,
+					unsigned long cycles)
+{
+	u32 ctrl_reg;
+
+	/* Disable the counter, set the counter value  and re-enable counter */
+	ctrl_reg = __raw_readl(timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+	ctrl_reg |= XTTCPSS_CNT_CNTRL_DISABLE_MASK;
+	__raw_writel(ctrl_reg, timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+
+	__raw_writel(cycles, timer->base_addr + XTTCPSS_INTR_VAL_OFFSET);
+
+	/* Reset the counter (0x10) so that it starts from 0, one-shot
+	   mode makes this needed for timing to be right. */
+	ctrl_reg |= 0x10;
+	ctrl_reg &= ~XTTCPSS_CNT_CNTRL_DISABLE_MASK;
+	__raw_writel(ctrl_reg, timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+}
+
+/**
+ * xttcpss_clock_event_interrupt - Clock event timer interrupt handler
+ *
+ * @irq:	IRQ number of the Timer
+ * @dev_id:	void pointer to the xttcpss_timer instance
+ *
+ * returns: Always IRQ_HANDLED - success
+ **/
+static irqreturn_t xttcpss_clock_event_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = &xttcpss_clockevent;
+	struct xttcpss_timer *timer = dev_id;
+
+	/* Acknowledge the interrupt and call event handler */
+	__raw_writel(__raw_readl(timer->base_addr + XTTCPSS_ISR_OFFSET),
+			timer->base_addr + XTTCPSS_ISR_OFFSET);
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction event_timer_irq = {
+	.name	= "xttcpss clockevent",
+	.flags	= IRQF_DISABLED | IRQF_TIMER,
+	.handler = xttcpss_clock_event_interrupt,
+};
+
+/**
+ * xttcpss_timer_hardware_init - Initialize the timer hardware
+ *
+ * Initialize the hardware to start the clock source, get the clock
+ * event timer ready to use, and hook up the interrupt.
+ **/
+static void __init xttcpss_timer_hardware_init(void)
+{
+	/* Setup the clock source counter to be an incrementing counter
+	 * with no interrupt and it rolls over at 0xFFFF. Pre-scale
+	   it by 32 also. Let it start running now.
+	 */
+	timers[XTTCPSS_CLOCKSOURCE].base_addr = XTTCPSS_TIMER_BASE;
+
+	__raw_writel(0x0, timers[XTTCPSS_CLOCKSOURCE].base_addr +
+				XTTCPSS_IER_OFFSET);
+	__raw_writel(0x9, timers[XTTCPSS_CLOCKSOURCE].base_addr +
+				XTTCPSS_CLK_CNTRL_OFFSET);
+	__raw_writel(0x10, timers[XTTCPSS_CLOCKSOURCE].base_addr +
+				XTTCPSS_CNT_CNTRL_OFFSET);
+
+	/* Setup the clock event timer to be an interval timer which
+	 * is prescaled by 32 using the interval interrupt. Leave it
+	 * disabled for now.
+	 */
+
+	timers[XTTCPSS_CLOCKEVENT].base_addr = XTTCPSS_TIMER_BASE + 4;
+
+	__raw_writel(0x23, timers[XTTCPSS_CLOCKEVENT].base_addr +
+			XTTCPSS_CNT_CNTRL_OFFSET);
+	__raw_writel(0x9, timers[XTTCPSS_CLOCKEVENT].base_addr +
+			XTTCPSS_CLK_CNTRL_OFFSET);
+	__raw_writel(0x1, timers[XTTCPSS_CLOCKEVENT].base_addr +
+			XTTCPSS_IER_OFFSET);
+
+	/* Setup IRQ the clock event timer */
+	event_timer_irq.dev_id = &timers[XTTCPSS_CLOCKEVENT];
+	setup_irq(XTTCPCC_EVENT_TIMER_IRQ, &event_timer_irq);
+}
+
+/**
+ * __raw_readl_cycles - Reads the timer counter register
+ *
+ * returns: Current timer counter register value
+ **/
+static cycle_t __raw_readl_cycles(struct clocksource *cs)
+{
+	struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKSOURCE];
+
+	return (cycle_t)__raw_readl(timer->base_addr +
+				XTTCPSS_COUNT_VAL_OFFSET);
+}
+
+
+/*
+ * Instantiate and initialize the clock source structure
+ */
+static struct clocksource clocksource_xttcpss = {
+	.name		= "xttcpss_timer1",
+	.rating		= 200,			/* Reasonable clock source */
+	.read		= __raw_readl_cycles,
+	.mask		= CLOCKSOURCE_MASK(16),
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+
+/**
+ * xttcpss_set_next_event - Sets the time interval for next event
+ *
+ * @cycles:	Timer interval ticks
+ * @evt:	Address of clock event instance
+ *
+ * returns: Always 0 - success
+ **/
+static int xttcpss_set_next_event(unsigned long cycles,
+					struct clock_event_device *evt)
+{
+	struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKEVENT];
+
+	xttcpss_set_interval(timer, cycles);
+	return 0;
+}
+
+/**
+ * xttcpss_set_mode - Sets the mode of timer
+ *
+ * @mode:	Mode to be set
+ * @evt:	Address of clock event instance
+ **/
+static void xttcpss_set_mode(enum clock_event_mode mode,
+					struct clock_event_device *evt)
+{
+	struct xttcpss_timer *timer = &timers[XTTCPSS_CLOCKEVENT];
+	u32 ctrl_reg;
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		xttcpss_set_interval(timer, TIMER_RATE / HZ);
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		ctrl_reg = __raw_readl(timer->base_addr +
+					XTTCPSS_CNT_CNTRL_OFFSET);
+		ctrl_reg |= XTTCPSS_CNT_CNTRL_DISABLE_MASK;
+		__raw_writel(ctrl_reg,
+				timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+		break;
+	case CLOCK_EVT_MODE_RESUME:
+		ctrl_reg = __raw_readl(timer->base_addr +
+					XTTCPSS_CNT_CNTRL_OFFSET);
+		ctrl_reg &= ~XTTCPSS_CNT_CNTRL_DISABLE_MASK;
+		__raw_writel(ctrl_reg,
+				timer->base_addr + XTTCPSS_CNT_CNTRL_OFFSET);
+		break;
+	}
+}
+
+/*
+ * Instantiate and initialize the clock event structure
+ */
+static struct clock_event_device xttcpss_clockevent = {
+	.name		= "xttcpss_timer2",
+	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+	.set_next_event	= xttcpss_set_next_event,
+	.set_mode	= xttcpss_set_mode,
+	.rating		= 200,
+};
+
+/**
+ * xttcpss_timer_init - Initialize the timer
+ *
+ * Initializes the timer hardware and register the clock source and clock event
+ * timers with Linux kernal timer framework
+ **/
+static void __init xttcpss_timer_init(void)
+{
+	xttcpss_timer_hardware_init();
+	clocksource_register_hz(&clocksource_xttcpss, TIMER_RATE);
+
+	/* Calculate the parameters to allow the clockevent to operate using
+	   integer math
+	*/
+	clockevents_calc_mult_shift(&xttcpss_clockevent, TIMER_RATE, 4);
+
+	xttcpss_clockevent.max_delta_ns =
+		clockevent_delta2ns(0xfffe, &xttcpss_clockevent);
+	xttcpss_clockevent.min_delta_ns =
+		clockevent_delta2ns(1, &xttcpss_clockevent);
+
+	/* Indicate that clock event is on 1st CPU as SMP boot needs it */
+
+	xttcpss_clockevent.cpumask = cpumask_of(0);
+	clockevents_register_device(&xttcpss_clockevent);
+}
+
+/*
+ * Instantiate and initialize the system timer structure
+ */
+struct sys_timer xttcpss_sys_timer = {
+	.init		= xttcpss_timer_init,
+};