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e8765afe54
bcmring has a set of four sp804 timers incorporated, yet it has its own copy of the sp804 code. Convert its clockevent implementation to the standard sp804 support code. Cc: Jiandong Zheng <jdzheng@broadcom.com> Cc: Scott Branden <sbranden@broadcom.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
249 lines
7.2 KiB
C
249 lines
7.2 KiB
C
/*
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* derived from linux/arch/arm/mach-versatile/core.c
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* linux/arch/arm/mach-bcmring/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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/* Portions copyright Broadcom 2008 */
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/platform_device.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/clkdev.h>
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#include <mach/csp/mm_addr.h>
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#include <mach/hardware.h>
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#include <linux/io.h>
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#include <asm/irq.h>
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#include <asm/hardware/arm_timer.h>
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#include <asm/hardware/timer-sp.h>
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#include <asm/mach-types.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/time.h>
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#include <asm/mach/map.h>
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#include <cfg_global.h>
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#include "clock.h"
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#include <csp/secHw.h>
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#include <mach/csp/secHw_def.h>
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#include <mach/csp/chipcHw_inline.h>
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#include <mach/csp/tmrHw_reg.h>
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#define AMBA_DEVICE(name, initname, base, plat, size) \
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static struct amba_device name##_device = { \
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.dev = { \
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.coherent_dma_mask = ~0, \
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.init_name = initname, \
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.platform_data = plat \
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}, \
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.res = { \
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.start = MM_ADDR_IO_##base, \
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.end = MM_ADDR_IO_##base + (size) - 1, \
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.flags = IORESOURCE_MEM \
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}, \
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.dma_mask = ~0, \
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.irq = { \
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IRQ_##base \
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} \
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}
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AMBA_DEVICE(uartA, "uarta", UARTA, NULL, SZ_4K);
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AMBA_DEVICE(uartB, "uartb", UARTB, NULL, SZ_4K);
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static struct clk pll1_clk = {
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.name = "PLL1",
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.type = CLK_TYPE_PRIMARY | CLK_TYPE_PLL1,
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.rate_hz = 2000000000,
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.use_cnt = 7,
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};
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static struct clk uart_clk = {
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.name = "UART",
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.type = CLK_TYPE_PROGRAMMABLE,
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.csp_id = chipcHw_CLOCK_UART,
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.rate_hz = HW_CFG_UART_CLK_HZ,
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.parent = &pll1_clk,
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};
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static struct clk dummy_apb_pclk = {
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.name = "BUSCLK",
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.type = CLK_TYPE_PRIMARY,
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.mode = CLK_MODE_XTAL,
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};
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/* Timer 0 - 25 MHz, Timer3 at bus clock rate, typically 150-166 MHz */
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#if defined(CONFIG_ARCH_FPGA11107)
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/* fpga cpu/bus are currently 30 times slower so scale frequency as well to */
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/* slow down Linux's sense of time */
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#define TIMER0_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30)
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#define TIMER1_FREQUENCY_MHZ (tmrHw_LOW_FREQUENCY_MHZ * 30)
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#define TIMER3_FREQUENCY_MHZ (tmrHw_HIGH_FREQUENCY_MHZ * 30)
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#define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000 * 30)
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#else
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#define TIMER0_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ
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#define TIMER1_FREQUENCY_MHZ tmrHw_LOW_FREQUENCY_MHZ
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#define TIMER3_FREQUENCY_MHZ tmrHw_HIGH_FREQUENCY_MHZ
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#define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000)
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#endif
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static struct clk sp804_timer012_clk = {
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.name = "sp804-timer-0,1,2",
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.type = CLK_TYPE_PRIMARY,
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.mode = CLK_MODE_XTAL,
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.rate_hz = TIMER1_FREQUENCY_MHZ * 1000000,
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};
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static struct clk sp804_timer3_clk = {
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.name = "sp804-timer-3",
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.type = CLK_TYPE_PRIMARY,
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.mode = CLK_MODE_XTAL,
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.rate_hz = TIMER3_FREQUENCY_KHZ * 1000,
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};
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static struct clk_lookup lookups[] = {
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{ /* Bus clock */
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.con_id = "apb_pclk",
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.clk = &dummy_apb_pclk,
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}, { /* UART0 */
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.dev_id = "uarta",
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.clk = &uart_clk,
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}, { /* UART1 */
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.dev_id = "uartb",
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.clk = &uart_clk,
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}, { /* SP804 timer 0 */
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.dev_id = "sp804",
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.con_id = "timer0",
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.clk = &sp804_timer012_clk,
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}, { /* SP804 timer 1 */
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.dev_id = "sp804",
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.con_id = "timer1",
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.clk = &sp804_timer012_clk,
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}, { /* SP804 timer 3 */
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.dev_id = "sp804",
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.con_id = "timer3",
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.clk = &sp804_timer3_clk,
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}
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};
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static struct amba_device *amba_devs[] __initdata = {
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&uartA_device,
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&uartB_device,
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};
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void __init bcmring_amba_init(void)
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{
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int i;
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u32 bus_clock;
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/* Linux is run initially in non-secure mode. Secure peripherals */
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/* generate FIQ, and must be handled in secure mode. Until we have */
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/* a linux security monitor implementation, keep everything in */
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/* non-secure mode. */
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chipcHw_busInterfaceClockEnable(chipcHw_REG_BUS_CLOCK_SPU);
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secHw_setUnsecure(secHw_BLK_MASK_CHIP_CONTROL |
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secHw_BLK_MASK_KEY_SCAN |
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secHw_BLK_MASK_TOUCH_SCREEN |
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secHw_BLK_MASK_UART0 |
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secHw_BLK_MASK_UART1 |
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secHw_BLK_MASK_WATCHDOG |
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secHw_BLK_MASK_SPUM |
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secHw_BLK_MASK_DDR2 |
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secHw_BLK_MASK_SPU |
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secHw_BLK_MASK_PKA |
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secHw_BLK_MASK_RNG |
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secHw_BLK_MASK_RTC |
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secHw_BLK_MASK_OTP |
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secHw_BLK_MASK_BOOT |
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secHw_BLK_MASK_MPU |
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secHw_BLK_MASK_TZCTRL | secHw_BLK_MASK_INTR);
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/* Only the devices attached to the AMBA bus are enabled just before the bus is */
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/* scanned and the drivers are loaded. The clocks need to be on for the AMBA bus */
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/* driver to access these blocks. The bus is probed, and the drivers are loaded. */
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/* FIXME Need to remove enable of PIF once CLCD clock enable used properly in FPGA. */
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bus_clock = chipcHw_REG_BUS_CLOCK_GE
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| chipcHw_REG_BUS_CLOCK_SDIO0 | chipcHw_REG_BUS_CLOCK_SDIO1;
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chipcHw_busInterfaceClockEnable(bus_clock);
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for (i = 0; i < ARRAY_SIZE(amba_devs); i++) {
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struct amba_device *d = amba_devs[i];
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amba_device_register(d, &iomem_resource);
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}
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}
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/*
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* Where is the timer (VA)?
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*/
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#define TIMER0_VA_BASE ((void __iomem *)MM_IO_BASE_TMR)
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#define TIMER1_VA_BASE ((void __iomem *)(MM_IO_BASE_TMR + 0x20))
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#define TIMER2_VA_BASE ((void __iomem *)(MM_IO_BASE_TMR + 0x40))
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#define TIMER3_VA_BASE ((void __iomem *)(MM_IO_BASE_TMR + 0x60))
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static int __init bcmring_clocksource_init(void)
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{
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/* setup timer1 as free-running clocksource */
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sp804_clocksource_init(TIMER1_VA_BASE, "timer1");
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/* setup timer3 as free-running clocksource */
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sp804_clocksource_init(TIMER3_VA_BASE, "timer3");
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return 0;
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}
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/*
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* Set up timer interrupt, and return the current time in seconds.
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*/
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void __init bcmring_init_timer(void)
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{
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printk(KERN_INFO "bcmring_init_timer\n");
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/*
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* Initialise to a known state (all timers off)
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*/
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writel(0, TIMER0_VA_BASE + TIMER_CTRL);
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writel(0, TIMER1_VA_BASE + TIMER_CTRL);
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writel(0, TIMER2_VA_BASE + TIMER_CTRL);
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writel(0, TIMER3_VA_BASE + TIMER_CTRL);
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/*
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* Make irqs happen for the system timer
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*/
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bcmring_clocksource_init();
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sp804_clockevents_register(TIMER0_VA_BASE, IRQ_TIMER0, "timer0");
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}
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struct sys_timer bcmring_timer = {
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.init = bcmring_init_timer,
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};
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void __init bcmring_init_early(void)
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{
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clkdev_add_table(lookups, ARRAY_SIZE(lookups));
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}
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