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ARM: Xilinx: Adding Xilinx board support

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The 1st board support is minimal to get a system up and running
on the Xilinx platform.

This platform reuses the clock implementation from plat-versatile, and
it depends entirely on CONFIG_OF support.  There is only one board
support file which obtains all device information from a device tree
dtb file which is passed to the kernel at boot time.

Signed-off-by: John Linn <john.linn@xilinx.com>
This commit is contained in:
John Linn 2011-06-20 11:47:27 -06:00
parent 2c53b436a3
commit b85a3ef4ac
24 changed files with 938 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/devicetree/bindings/arm/xilinx.txt Normal file
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@ -0,0 +1,7 @@
Xilinx Zynq EP107 Emulation Platform board
This board is an emulation platform for the Zynq product which is
based on an ARM Cortex A9 processor.
Required root node properties:
- compatible = "xlnx,zynq-ep107";

14
arch/arm/Kconfig
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@ -879,6 +879,20 @@ config ARCH_VT8500
select HAVE_PWM
help
Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.
config ARCH_ZYNQ
bool "Xilinx Zynq ARM Cortex A9 Platform"
select CPU_V7
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select CLKDEV_LOOKUP
select ARM_GIC
select ARM_AMBA
select ICST
select USE_OF
help
Support for Xilinx Zynq ARM Cortex A9 Platform
endchoice
#

2
arch/arm/Makefile
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@ -196,6 +196,7 @@ machine-$(CONFIG_MACH_SPEAR300) := spear3xx
machine-$(CONFIG_MACH_SPEAR310) := spear3xx
machine-$(CONFIG_MACH_SPEAR320) := spear3xx
machine-$(CONFIG_MACH_SPEAR600) := spear6xx
machine-$(CONFIG_ARCH_ZYNQ) := zynq
# Platform directory name. This list is sorted alphanumerically
# by CONFIG_* macro name.
@ -203,6 +204,7 @@ plat-$(CONFIG_ARCH_MXC) := mxc
plat-$(CONFIG_ARCH_OMAP) := omap
plat-$(CONFIG_ARCH_S3C64XX) := samsung
plat-$(CONFIG_ARCH_TCC_926) := tcc
plat-$(CONFIG_ARCH_ZYNQ) := versatile
plat-$(CONFIG_PLAT_IOP) := iop
plat-$(CONFIG_PLAT_NOMADIK) := nomadik
plat-$(CONFIG_PLAT_ORION) := orion

52
arch/arm/boot/dts/zynq-ep107.dts Normal file
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@ -0,0 +1,52 @@
/*
* 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.
*/
/dts-v1/;
/ {
model = "Xilinx Zynq EP107";
compatible = "xlnx,zynq-ep107";
#address-cells = <1>;
#size-cells = <1>;
interrupt-parent = <&intc>;
memory {
device_type = "memory";
reg = <0x0 0x10000000>;
};
chosen {
bootargs = "console=ttyPS0,9600 root=/dev/ram rw initrd=0x800000,8M earlyprintk";
linux,stdout-path = &uart0;
};
amba {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
ranges;
intc: interrupt-controller@f8f01000 {
interrupt-controller;
compatible = "arm,gic";
reg = <0xF8F01000 0x1000>;
#interrupt-cells = <2>;
};
uart0: uart@e0000000 {
compatible = "xlnx,xuartps";
reg = <0xE0000000 0x1000>;
interrupts = <59 0>;
clock = <50000000>;
};
};
};

6
arch/arm/mach-zynq/Makefile Normal file
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@ -0,0 +1,6 @@
#
# Makefile for the linux kernel.
#
# Common support
obj-y := common.o timer.o board_dt.o

3
arch/arm/mach-zynq/Makefile.boot Normal file
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@ -0,0 +1,3 @@
zreladdr-y := 0x00008000
params_phys-y := 0x00000100
initrd_phys-y := 0x00800000

37
arch/arm/mach-zynq/board_dt.c Normal file
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@ -0,0 +1,37 @@
/*
* This file contains code for boards with device tree support.
*
* Copyright (C) 2011 Xilinx
*
* based on arch/arm/mach-realview/core.c
*
* Copyright (C) 1999 - 2003 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* 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/of.h>
#include <asm/mach/arch.h>
#include <asm/mach-types.h>
#include "common.h"
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

102
arch/arm/mach-zynq/common.c Normal file
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@ -0,0 +1,102 @@
/*
* 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 <asm/mach/map.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.
*/
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.
*/
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.
*/
void __init xilinx_map_io(void)
{
iotable_init(io_desc, ARRAY_SIZE(io_desc));
}

29
arch/arm/mach-zynq/common.h Normal file
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@ -0,0 +1,29 @@
/*
* 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 <linux/init.h>
#include <asm/mach/time.h>
extern void xilinx_init_machine(void);
extern void xilinx_irq_init(void);
extern void xilinx_map_io(void);
extern struct sys_timer xttcpss_sys_timer;
#endif

32
arch/arm/mach-zynq/include/mach/clkdev.h Normal file
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@ -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

36
arch/arm/mach-zynq/include/mach/debug-macro.S Normal file
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@ -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

30
arch/arm/mach-zynq/include/mach/entry-macro.S Normal file
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@ -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

18
arch/arm/mach-zynq/include/mach/hardware.h Normal file
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@ -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

33
arch/arm/mach-zynq/include/mach/io.h Normal file
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@ -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

21
arch/arm/mach-zynq/include/mach/irqs.h Normal file
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@ -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

22
arch/arm/mach-zynq/include/mach/memory.h Normal file
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@ -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

28
arch/arm/mach-zynq/include/mach/system.h Normal file
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@ -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

23
arch/arm/mach-zynq/include/mach/timex.h Normal file
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@ -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

25
arch/arm/mach-zynq/include/mach/uart.h Normal file
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@ -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

51
arch/arm/mach-zynq/include/mach/uncompress.h Normal file
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@ -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

20
arch/arm/mach-zynq/include/mach/vmalloc.h Normal file
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@ -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

48
arch/arm/mach-zynq/include/mach/zynq_soc.h Normal file
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@ -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

298
arch/arm/mach-zynq/timer.c Normal file
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/*
* 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,
};

2
arch/arm/mm/Kconfig
View File

@ -821,7 +821,7 @@ config CACHE_L2X0
depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || \
REALVIEW_EB_A9MP || SOC_IMX35 || SOC_IMX31 || MACH_REALVIEW_PBX || \
ARCH_NOMADIK || ARCH_OMAP4 || ARCH_EXYNOS4 || ARCH_TEGRA || \
ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || ARCH_SHMOBILE
ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || ARCH_SHMOBILE || ARCH_ZYNQ
default y
select OUTER_CACHE
select OUTER_CACHE_SYNC