ee348d5a1d
Having discussed broadcast tick support with Thomas Glexiner, the broadcast tick devices should be registered with a higher rating than the global tick device, and it should have the ONESHOT and PERIODIC feature flags set. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Thomas Glexiner <tglx@linutronix.de>
780 lines
18 KiB
C
780 lines
18 KiB
C
/*
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* linux/arch/arm/mach-realview/core.c
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*
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* Copyright (C) 1999 - 2003 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/sysdev.h>
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/clcd.h>
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#include <linux/clocksource.h>
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#include <linux/clockchips.h>
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#include <linux/io.h>
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#include <linux/smsc911x.h>
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#include <linux/ata_platform.h>
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#include <asm/clkdev.h>
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#include <asm/system.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#include <asm/leds.h>
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#include <asm/mach-types.h>
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#include <asm/hardware/arm_timer.h>
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#include <asm/hardware/icst307.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/flash.h>
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#include <asm/mach/irq.h>
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#include <asm/mach/map.h>
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#include <asm/mach/mmc.h>
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#include <asm/hardware/gic.h>
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#include "core.h"
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#include "clock.h"
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#define REALVIEW_REFCOUNTER (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_24MHz_OFFSET)
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/* used by entry-macro.S and platsmp.c */
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void __iomem *gic_cpu_base_addr;
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/*
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* This is the RealView sched_clock implementation. This has
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* a resolution of 41.7ns, and a maximum value of about 179s.
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*/
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unsigned long long sched_clock(void)
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{
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unsigned long long v;
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v = (unsigned long long)readl(REALVIEW_REFCOUNTER) * 125;
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do_div(v, 3);
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return v;
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}
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#define REALVIEW_FLASHCTRL (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_FLASH_OFFSET)
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static int realview_flash_init(void)
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{
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u32 val;
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val = __raw_readl(REALVIEW_FLASHCTRL);
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val &= ~REALVIEW_FLASHPROG_FLVPPEN;
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__raw_writel(val, REALVIEW_FLASHCTRL);
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return 0;
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}
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static void realview_flash_exit(void)
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{
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u32 val;
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val = __raw_readl(REALVIEW_FLASHCTRL);
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val &= ~REALVIEW_FLASHPROG_FLVPPEN;
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__raw_writel(val, REALVIEW_FLASHCTRL);
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}
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static void realview_flash_set_vpp(int on)
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{
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u32 val;
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val = __raw_readl(REALVIEW_FLASHCTRL);
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if (on)
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val |= REALVIEW_FLASHPROG_FLVPPEN;
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else
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val &= ~REALVIEW_FLASHPROG_FLVPPEN;
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__raw_writel(val, REALVIEW_FLASHCTRL);
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}
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static struct flash_platform_data realview_flash_data = {
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.map_name = "cfi_probe",
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.width = 4,
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.init = realview_flash_init,
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.exit = realview_flash_exit,
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.set_vpp = realview_flash_set_vpp,
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};
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struct platform_device realview_flash_device = {
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.name = "armflash",
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.id = 0,
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.dev = {
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.platform_data = &realview_flash_data,
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},
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};
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int realview_flash_register(struct resource *res, u32 num)
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{
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realview_flash_device.resource = res;
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realview_flash_device.num_resources = num;
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return platform_device_register(&realview_flash_device);
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}
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static struct smsc911x_platform_config smsc911x_config = {
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.flags = SMSC911X_USE_32BIT,
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.irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH,
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.irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL,
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.phy_interface = PHY_INTERFACE_MODE_MII,
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};
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static struct platform_device realview_eth_device = {
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.name = "smsc911x",
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.id = 0,
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.num_resources = 2,
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};
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int realview_eth_register(const char *name, struct resource *res)
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{
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if (name)
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realview_eth_device.name = name;
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realview_eth_device.resource = res;
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if (strcmp(realview_eth_device.name, "smsc911x") == 0)
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realview_eth_device.dev.platform_data = &smsc911x_config;
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return platform_device_register(&realview_eth_device);
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}
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struct platform_device realview_usb_device = {
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.name = "isp1760",
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.num_resources = 2,
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};
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int realview_usb_register(struct resource *res)
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{
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realview_usb_device.resource = res;
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return platform_device_register(&realview_usb_device);
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}
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static struct pata_platform_info pata_platform_data = {
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.ioport_shift = 1,
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};
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static struct resource pata_resources[] = {
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[0] = {
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.start = REALVIEW_CF_BASE,
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.end = REALVIEW_CF_BASE + 0xff,
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.start = REALVIEW_CF_BASE + 0x100,
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.end = REALVIEW_CF_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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},
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};
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struct platform_device realview_cf_device = {
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.name = "pata_platform",
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.id = -1,
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.num_resources = ARRAY_SIZE(pata_resources),
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.resource = pata_resources,
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.dev = {
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.platform_data = &pata_platform_data,
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},
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};
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static struct resource realview_i2c_resource = {
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.start = REALVIEW_I2C_BASE,
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.end = REALVIEW_I2C_BASE + SZ_4K - 1,
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.flags = IORESOURCE_MEM,
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};
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struct platform_device realview_i2c_device = {
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.name = "versatile-i2c",
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.id = 0,
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.num_resources = 1,
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.resource = &realview_i2c_resource,
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};
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static struct i2c_board_info realview_i2c_board_info[] = {
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{
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I2C_BOARD_INFO("rtc-ds1307", 0xd0 >> 1),
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.type = "ds1338",
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},
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};
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static int __init realview_i2c_init(void)
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{
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return i2c_register_board_info(0, realview_i2c_board_info,
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ARRAY_SIZE(realview_i2c_board_info));
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}
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arch_initcall(realview_i2c_init);
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#define REALVIEW_SYSMCI (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_MCI_OFFSET)
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static unsigned int realview_mmc_status(struct device *dev)
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{
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struct amba_device *adev = container_of(dev, struct amba_device, dev);
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u32 mask;
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if (adev->res.start == REALVIEW_MMCI0_BASE)
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mask = 1;
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else
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mask = 2;
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return readl(REALVIEW_SYSMCI) & mask;
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}
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struct mmc_platform_data realview_mmc0_plat_data = {
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.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
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.status = realview_mmc_status,
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};
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struct mmc_platform_data realview_mmc1_plat_data = {
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.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
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.status = realview_mmc_status,
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};
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/*
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* Clock handling
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*/
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static const struct icst307_params realview_oscvco_params = {
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.ref = 24000,
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.vco_max = 200000,
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.vd_min = 4 + 8,
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.vd_max = 511 + 8,
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.rd_min = 1 + 2,
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.rd_max = 127 + 2,
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};
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static void realview_oscvco_set(struct clk *clk, struct icst307_vco vco)
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{
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void __iomem *sys_lock = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LOCK_OFFSET;
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void __iomem *sys_osc;
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u32 val;
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if (machine_is_realview_pb1176())
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sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC0_OFFSET;
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else
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sys_osc = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_OSC4_OFFSET;
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val = readl(sys_osc) & ~0x7ffff;
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val |= vco.v | (vco.r << 9) | (vco.s << 16);
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writel(0xa05f, sys_lock);
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writel(val, sys_osc);
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writel(0, sys_lock);
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}
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static struct clk oscvco_clk = {
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.params = &realview_oscvco_params,
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.setvco = realview_oscvco_set,
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};
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/*
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* These are fixed clocks.
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*/
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static struct clk ref24_clk = {
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.rate = 24000000,
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};
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static struct clk_lookup lookups[] = {
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{ /* UART0 */
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.dev_id = "dev:f1",
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.clk = &ref24_clk,
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}, { /* UART1 */
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.dev_id = "dev:f2",
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.clk = &ref24_clk,
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}, { /* UART2 */
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.dev_id = "dev:f3",
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.clk = &ref24_clk,
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}, { /* UART3 */
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.dev_id = "fpga:09",
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.clk = &ref24_clk,
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}, { /* KMI0 */
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.dev_id = "fpga:06",
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.clk = &ref24_clk,
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}, { /* KMI1 */
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.dev_id = "fpga:07",
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.clk = &ref24_clk,
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}, { /* MMC0 */
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.dev_id = "fpga:05",
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.clk = &ref24_clk,
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}, { /* EB:CLCD */
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.dev_id = "dev:20",
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.clk = &oscvco_clk,
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}, { /* PB:CLCD */
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.dev_id = "issp:20",
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.clk = &oscvco_clk,
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}
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};
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static int __init clk_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(lookups); i++)
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clkdev_add(&lookups[i]);
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return 0;
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}
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arch_initcall(clk_init);
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/*
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* CLCD support.
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*/
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#define SYS_CLCD_NLCDIOON (1 << 2)
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#define SYS_CLCD_VDDPOSSWITCH (1 << 3)
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#define SYS_CLCD_PWR3V5SWITCH (1 << 4)
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#define SYS_CLCD_ID_MASK (0x1f << 8)
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#define SYS_CLCD_ID_SANYO_3_8 (0x00 << 8)
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#define SYS_CLCD_ID_UNKNOWN_8_4 (0x01 << 8)
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#define SYS_CLCD_ID_EPSON_2_2 (0x02 << 8)
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#define SYS_CLCD_ID_SANYO_2_5 (0x07 << 8)
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#define SYS_CLCD_ID_VGA (0x1f << 8)
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static struct clcd_panel vga = {
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.mode = {
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.name = "VGA",
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.refresh = 60,
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.xres = 640,
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.yres = 480,
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.pixclock = 39721,
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.left_margin = 40,
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.right_margin = 24,
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.upper_margin = 32,
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.lower_margin = 11,
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.hsync_len = 96,
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.vsync_len = 2,
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.sync = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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},
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.width = -1,
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.height = -1,
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.tim2 = TIM2_BCD | TIM2_IPC,
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.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
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.bpp = 16,
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};
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static struct clcd_panel xvga = {
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.mode = {
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.name = "XVGA",
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.refresh = 60,
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.xres = 1024,
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.yres = 768,
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.pixclock = 15748,
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.left_margin = 152,
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.right_margin = 48,
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.upper_margin = 23,
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.lower_margin = 3,
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.hsync_len = 104,
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.vsync_len = 4,
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.sync = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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},
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.width = -1,
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.height = -1,
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.tim2 = TIM2_BCD | TIM2_IPC,
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.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
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.bpp = 16,
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};
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static struct clcd_panel sanyo_3_8_in = {
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.mode = {
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.name = "Sanyo QVGA",
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.refresh = 116,
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.xres = 320,
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.yres = 240,
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.pixclock = 100000,
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.left_margin = 6,
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.right_margin = 6,
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.upper_margin = 5,
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.lower_margin = 5,
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.hsync_len = 6,
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.vsync_len = 6,
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.sync = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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},
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.width = -1,
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.height = -1,
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.tim2 = TIM2_BCD,
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.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
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.bpp = 16,
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};
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static struct clcd_panel sanyo_2_5_in = {
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.mode = {
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.name = "Sanyo QVGA Portrait",
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.refresh = 116,
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.xres = 240,
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.yres = 320,
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.pixclock = 100000,
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.left_margin = 20,
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.right_margin = 10,
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.upper_margin = 2,
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.lower_margin = 2,
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.hsync_len = 10,
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.vsync_len = 2,
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.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
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.vmode = FB_VMODE_NONINTERLACED,
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},
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.width = -1,
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.height = -1,
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.tim2 = TIM2_IVS | TIM2_IHS | TIM2_IPC,
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.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
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.bpp = 16,
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};
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static struct clcd_panel epson_2_2_in = {
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.mode = {
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.name = "Epson QCIF",
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.refresh = 390,
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.xres = 176,
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.yres = 220,
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.pixclock = 62500,
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.left_margin = 3,
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.right_margin = 2,
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.upper_margin = 1,
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.lower_margin = 0,
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.hsync_len = 3,
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.vsync_len = 2,
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.sync = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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},
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.width = -1,
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.height = -1,
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.tim2 = TIM2_BCD | TIM2_IPC,
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.cntl = CNTL_LCDTFT | CNTL_BGR | CNTL_LCDVCOMP(1),
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.bpp = 16,
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};
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/*
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* Detect which LCD panel is connected, and return the appropriate
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* clcd_panel structure. Note: we do not have any information on
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* the required timings for the 8.4in panel, so we presently assume
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* VGA timings.
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*/
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static struct clcd_panel *realview_clcd_panel(void)
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{
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void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
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struct clcd_panel *vga_panel;
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struct clcd_panel *panel;
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u32 val;
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if (machine_is_realview_eb())
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vga_panel = &vga;
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else
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vga_panel = &xvga;
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val = readl(sys_clcd) & SYS_CLCD_ID_MASK;
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if (val == SYS_CLCD_ID_SANYO_3_8)
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panel = &sanyo_3_8_in;
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else if (val == SYS_CLCD_ID_SANYO_2_5)
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panel = &sanyo_2_5_in;
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else if (val == SYS_CLCD_ID_EPSON_2_2)
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panel = &epson_2_2_in;
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else if (val == SYS_CLCD_ID_VGA)
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panel = vga_panel;
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else {
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printk(KERN_ERR "CLCD: unknown LCD panel ID 0x%08x, using VGA\n",
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val);
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panel = vga_panel;
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}
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return panel;
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}
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/*
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* Disable all display connectors on the interface module.
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*/
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static void realview_clcd_disable(struct clcd_fb *fb)
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{
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void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
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u32 val;
|
|
|
|
val = readl(sys_clcd);
|
|
val &= ~SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
|
|
writel(val, sys_clcd);
|
|
}
|
|
|
|
/*
|
|
* Enable the relevant connector on the interface module.
|
|
*/
|
|
static void realview_clcd_enable(struct clcd_fb *fb)
|
|
{
|
|
void __iomem *sys_clcd = __io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_CLCD_OFFSET;
|
|
u32 val;
|
|
|
|
/*
|
|
* Enable the PSUs
|
|
*/
|
|
val = readl(sys_clcd);
|
|
val |= SYS_CLCD_NLCDIOON | SYS_CLCD_PWR3V5SWITCH;
|
|
writel(val, sys_clcd);
|
|
}
|
|
|
|
static int realview_clcd_setup(struct clcd_fb *fb)
|
|
{
|
|
unsigned long framesize;
|
|
dma_addr_t dma;
|
|
|
|
if (machine_is_realview_eb())
|
|
/* VGA, 16bpp */
|
|
framesize = 640 * 480 * 2;
|
|
else
|
|
/* XVGA, 16bpp */
|
|
framesize = 1024 * 768 * 2;
|
|
|
|
fb->panel = realview_clcd_panel();
|
|
|
|
fb->fb.screen_base = dma_alloc_writecombine(&fb->dev->dev, framesize,
|
|
&dma, GFP_KERNEL);
|
|
if (!fb->fb.screen_base) {
|
|
printk(KERN_ERR "CLCD: unable to map framebuffer\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
fb->fb.fix.smem_start = dma;
|
|
fb->fb.fix.smem_len = framesize;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int realview_clcd_mmap(struct clcd_fb *fb, struct vm_area_struct *vma)
|
|
{
|
|
return dma_mmap_writecombine(&fb->dev->dev, vma,
|
|
fb->fb.screen_base,
|
|
fb->fb.fix.smem_start,
|
|
fb->fb.fix.smem_len);
|
|
}
|
|
|
|
static void realview_clcd_remove(struct clcd_fb *fb)
|
|
{
|
|
dma_free_writecombine(&fb->dev->dev, fb->fb.fix.smem_len,
|
|
fb->fb.screen_base, fb->fb.fix.smem_start);
|
|
}
|
|
|
|
struct clcd_board clcd_plat_data = {
|
|
.name = "RealView",
|
|
.check = clcdfb_check,
|
|
.decode = clcdfb_decode,
|
|
.disable = realview_clcd_disable,
|
|
.enable = realview_clcd_enable,
|
|
.setup = realview_clcd_setup,
|
|
.mmap = realview_clcd_mmap,
|
|
.remove = realview_clcd_remove,
|
|
};
|
|
|
|
#ifdef CONFIG_LEDS
|
|
#define VA_LEDS_BASE (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
|
|
|
|
void realview_leds_event(led_event_t ledevt)
|
|
{
|
|
unsigned long flags;
|
|
u32 val;
|
|
|
|
local_irq_save(flags);
|
|
val = readl(VA_LEDS_BASE);
|
|
|
|
switch (ledevt) {
|
|
case led_idle_start:
|
|
val = val & ~REALVIEW_SYS_LED0;
|
|
break;
|
|
|
|
case led_idle_end:
|
|
val = val | REALVIEW_SYS_LED0;
|
|
break;
|
|
|
|
case led_timer:
|
|
val = val ^ REALVIEW_SYS_LED1;
|
|
break;
|
|
|
|
case led_halted:
|
|
val = 0;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
writel(val, VA_LEDS_BASE);
|
|
local_irq_restore(flags);
|
|
}
|
|
#endif /* CONFIG_LEDS */
|
|
|
|
/*
|
|
* Where is the timer (VA)?
|
|
*/
|
|
void __iomem *timer0_va_base;
|
|
void __iomem *timer1_va_base;
|
|
void __iomem *timer2_va_base;
|
|
void __iomem *timer3_va_base;
|
|
|
|
/*
|
|
* How long is the timer interval?
|
|
*/
|
|
#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
|
|
#if TIMER_INTERVAL >= 0x100000
|
|
#define TIMER_RELOAD (TIMER_INTERVAL >> 8)
|
|
#define TIMER_DIVISOR (TIMER_CTRL_DIV256)
|
|
#define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
|
|
#elif TIMER_INTERVAL >= 0x10000
|
|
#define TIMER_RELOAD (TIMER_INTERVAL >> 4) /* Divide by 16 */
|
|
#define TIMER_DIVISOR (TIMER_CTRL_DIV16)
|
|
#define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
|
|
#else
|
|
#define TIMER_RELOAD (TIMER_INTERVAL)
|
|
#define TIMER_DIVISOR (TIMER_CTRL_DIV1)
|
|
#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
|
|
#endif
|
|
|
|
static void timer_set_mode(enum clock_event_mode mode,
|
|
struct clock_event_device *clk)
|
|
{
|
|
unsigned long ctrl;
|
|
|
|
switch(mode) {
|
|
case CLOCK_EVT_MODE_PERIODIC:
|
|
writel(TIMER_RELOAD, timer0_va_base + TIMER_LOAD);
|
|
|
|
ctrl = TIMER_CTRL_PERIODIC;
|
|
ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
|
|
break;
|
|
case CLOCK_EVT_MODE_ONESHOT:
|
|
/* period set, and timer enabled in 'next_event' hook */
|
|
ctrl = TIMER_CTRL_ONESHOT;
|
|
ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
|
|
break;
|
|
case CLOCK_EVT_MODE_UNUSED:
|
|
case CLOCK_EVT_MODE_SHUTDOWN:
|
|
default:
|
|
ctrl = 0;
|
|
}
|
|
|
|
writel(ctrl, timer0_va_base + TIMER_CTRL);
|
|
}
|
|
|
|
static int timer_set_next_event(unsigned long evt,
|
|
struct clock_event_device *unused)
|
|
{
|
|
unsigned long ctrl = readl(timer0_va_base + TIMER_CTRL);
|
|
|
|
writel(evt, timer0_va_base + TIMER_LOAD);
|
|
writel(ctrl | TIMER_CTRL_ENABLE, timer0_va_base + TIMER_CTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct clock_event_device timer0_clockevent = {
|
|
.name = "timer0",
|
|
.shift = 32,
|
|
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
|
|
.set_mode = timer_set_mode,
|
|
.set_next_event = timer_set_next_event,
|
|
.rating = 300,
|
|
.cpumask = cpu_all_mask,
|
|
};
|
|
|
|
static void __init realview_clockevents_init(unsigned int timer_irq)
|
|
{
|
|
timer0_clockevent.irq = timer_irq;
|
|
timer0_clockevent.mult =
|
|
div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
|
|
timer0_clockevent.max_delta_ns =
|
|
clockevent_delta2ns(0xffffffff, &timer0_clockevent);
|
|
timer0_clockevent.min_delta_ns =
|
|
clockevent_delta2ns(0xf, &timer0_clockevent);
|
|
|
|
clockevents_register_device(&timer0_clockevent);
|
|
}
|
|
|
|
/*
|
|
* IRQ handler for the timer
|
|
*/
|
|
static irqreturn_t realview_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct clock_event_device *evt = &timer0_clockevent;
|
|
|
|
/* clear the interrupt */
|
|
writel(1, timer0_va_base + TIMER_INTCLR);
|
|
|
|
evt->event_handler(evt);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction realview_timer_irq = {
|
|
.name = "RealView Timer Tick",
|
|
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
|
|
.handler = realview_timer_interrupt,
|
|
};
|
|
|
|
static cycle_t realview_get_cycles(struct clocksource *cs)
|
|
{
|
|
return ~readl(timer3_va_base + TIMER_VALUE);
|
|
}
|
|
|
|
static struct clocksource clocksource_realview = {
|
|
.name = "timer3",
|
|
.rating = 200,
|
|
.read = realview_get_cycles,
|
|
.mask = CLOCKSOURCE_MASK(32),
|
|
.shift = 20,
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
static void __init realview_clocksource_init(void)
|
|
{
|
|
/* setup timer 0 as free-running clocksource */
|
|
writel(0, timer3_va_base + TIMER_CTRL);
|
|
writel(0xffffffff, timer3_va_base + TIMER_LOAD);
|
|
writel(0xffffffff, timer3_va_base + TIMER_VALUE);
|
|
writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
|
|
timer3_va_base + TIMER_CTRL);
|
|
|
|
clocksource_realview.mult =
|
|
clocksource_khz2mult(1000, clocksource_realview.shift);
|
|
clocksource_register(&clocksource_realview);
|
|
}
|
|
|
|
/*
|
|
* Set up the clock source and clock events devices
|
|
*/
|
|
void __init realview_timer_init(unsigned int timer_irq)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* set clock frequency:
|
|
* REALVIEW_REFCLK is 32KHz
|
|
* REALVIEW_TIMCLK is 1MHz
|
|
*/
|
|
val = readl(__io_address(REALVIEW_SCTL_BASE));
|
|
writel((REALVIEW_TIMCLK << REALVIEW_TIMER1_EnSel) |
|
|
(REALVIEW_TIMCLK << REALVIEW_TIMER2_EnSel) |
|
|
(REALVIEW_TIMCLK << REALVIEW_TIMER3_EnSel) |
|
|
(REALVIEW_TIMCLK << REALVIEW_TIMER4_EnSel) | val,
|
|
__io_address(REALVIEW_SCTL_BASE));
|
|
|
|
/*
|
|
* Initialise to a known state (all timers off)
|
|
*/
|
|
writel(0, timer0_va_base + TIMER_CTRL);
|
|
writel(0, timer1_va_base + TIMER_CTRL);
|
|
writel(0, timer2_va_base + TIMER_CTRL);
|
|
writel(0, timer3_va_base + TIMER_CTRL);
|
|
|
|
/*
|
|
* Make irqs happen for the system timer
|
|
*/
|
|
setup_irq(timer_irq, &realview_timer_irq);
|
|
|
|
realview_clocksource_init();
|
|
realview_clockevents_init(timer_irq);
|
|
}
|