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authorpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2009-12-27 21:44:21 +0000
committerpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2009-12-27 21:44:21 +0000
commitd068dc36f0be095cb9a82cf64804aba6ba2bf555 (patch)
treecef56572a31026f98ab0aa39f462183a416fa9cc /nuttx/arch/arm/src/lpc313x
parent4b252f09c5532b5b24f20b3924abb1363c400c3d (diff)
downloadpx4-nuttx-d068dc36f0be095cb9a82cf64804aba6ba2bf555.tar.gz
px4-nuttx-d068dc36f0be095cb9a82cf64804aba6ba2bf555.tar.bz2
px4-nuttx-d068dc36f0be095cb9a82cf64804aba6ba2bf555.zip
Add timer ISR
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2442 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lpc313x')
-rwxr-xr-xnuttx/arch/arm/src/lpc313x/Make.defs4
-rwxr-xr-xnuttx/arch/arm/src/lpc313x/lpc313x_cgu.h19
-rwxr-xr-xnuttx/arch/arm/src/lpc313x/lpc313x_cgudrvr.h79
-rwxr-xr-xnuttx/arch/arm/src/lpc313x/lpc313x_softreset.c90
-rwxr-xr-xnuttx/arch/arm/src/lpc313x/lpc313x_timerisr.c162
5 files changed, 346 insertions, 8 deletions
diff --git a/nuttx/arch/arm/src/lpc313x/Make.defs b/nuttx/arch/arm/src/lpc313x/Make.defs
index 2eee54cc8..012eb7c4f 100755
--- a/nuttx/arch/arm/src/lpc313x/Make.defs
+++ b/nuttx/arch/arm/src/lpc313x/Make.defs
@@ -47,7 +47,7 @@ CMN_CSRCS = up_assert.c up_blocktask.c up_copystate.c up_createstack.c \
CGU_ASRCS =
CGU_CSRCS = lpc313x_clkdomain.c lpc313x_clkfreq.c lpc313x_esrndx.c \
- lpc313x_fdcndx.c
+ lpc313x_fdcndx.c lpc313x_softreset.c
CHIP_ASRCS = $(CGU_ASRCS)
-CHIP_CSRCS = lpc313x_irq.c lpc313x_allocateheap.c $(CGU_CSRCS)
+CHIP_CSRCS = lpc313x_allocateheap.c lpc313x_irq.c lpc313x_timerisr.c $(CGU_CSRCS)
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_cgu.h b/nuttx/arch/arm/src/lpc313x/lpc313x_cgu.h
index 3d31fe4b6..4660c86ae 100755
--- a/nuttx/arch/arm/src/lpc313x/lpc313x_cgu.h
+++ b/nuttx/arch/arm/src/lpc313x/lpc313x_cgu.h
@@ -484,6 +484,10 @@
#define LPC313X_CGU_WDBARK_OFFSET 0x004 /* Watch dog bark register */
#define LPC313X_CGU_FFASTON_OFFSET 0x008 /* Activate fast oscillator register */
#define LPC313X_CGU_FFASTBYP_OFFSET 0x00c /* Bypass comparator register fast oscillator reset */
+
+/* Reset control */
+
+#define LPC313X_CGU_SOFTRST_OFFSET(n) (0x010+((n)<<2))
#define LPC313X_CGU_APB0RST_OFFSET 0x010 /* Reset AHB part of AHB_TO_APB0 bridge */
#define LPC313X_CGU_AHB2APB0RST_OFFSET 0x014 /* Reset APB part of AHB_TO_APB0 bridge */
#define LPC313X_CGU_APB1RST_OFFSET 0x018 /* Reset AHB part of AHB_TO_APB1 bridge */
@@ -524,10 +528,11 @@
#define LPC313X_CGU_LCDRST_OFFSET 0x0b4 /* Reset LCD Interface */
#define LPC313X_CGU_SPIRSTAPB_OFFSET 0x0b8 /* Reset apb_clk domain of SPI */
#define LPC313X_CGU_SPIRSTIP_OFFSET 0x0bc /* Reset ip_clk domain of SPI */
-#define LPC313X_CGU_DMA_RST_OFFSET 0x0c0 /* Reset DMA */
+#define LPC313X_CGU_DMARST_OFFSET 0x0c0 /* Reset DMA */
#define LPC313X_CGU_NANDECCRST_OFFSET 0x0c4 /* Reset Nandflash Controller ECC clock */
/* 0x0c8: Reserved */
#define LPC313X_CGU_NANDCTRLRST_OFFSET 0x0cc /* Reset of Nandflash Controller */
+#define LPC313X_CGU_RNGRST_OFFSET 0x0d0 /* Reset of RNG */
#define LPC313X_CGU_SDMMCRST_OFFSET 0x0d4 /* Reset MCI (on AHB clock) */
#define LPC313X_CGU_SDMMCRSTCKIN_OFFSET 0x0d8 /* Reset MCI synchronous (on IP clock) */
#define LPC313X_CGU_USBOTGAHBRST_OFFSET 0x0dc /* Reset USB_OTG */
@@ -986,6 +991,10 @@
#define LPC313X_CGU_WDBARK (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_WDBARK_OFFSET)
#define LPC313X_CGU_FFASTON (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_FFASTON_OFFSET)
#define LPC313X_CGU_FFASTBYP (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_FFASTBYP_OFFSET)
+
+/* Reset control */
+
+#define LPC313X_CGU_SOFTRST(n) (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_SOFTRST_OFFSET(n))
#define LPC313X_CGU_APB0RST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_APB0RST_OFFSET)
#define LPC313X_CGU_AHB2APB0RST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_AHB2APB0RST_OFFSET)
#define LPC313X_CGU_APB1RST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_APB1RST_OFFSET)
@@ -1025,7 +1034,7 @@
#define LPC313X_CGU_LCDRST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_LCDRST_OFFSET)
#define LPC313X_CGU_SPIRSTAPB (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_SPIRSTAPB_OFFSET)
#define LPC313X_CGU_SPIRSTIP (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_SPIRSTIP_OFFSET)
-#define LPC313X_CGU_DMA_RST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_DMA_RST_OFFSET)
+#define LPC313X_CGU_DMARST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_DMARST_OFFSET)
#define LPC313X_CGU_NANDECCRST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_NANDECCRST_OFFSET)
#define LPC313X_CGU_NANDCTRLRST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_NANDCTRLRST_OFFSET)
#define LPC313X_CGU_SDMMCRST (LPC313X_CGU_CFG_VBASE+LPC313X_CGU_SDMMCRST_OFFSET)
@@ -1256,6 +1265,9 @@
#define CGU_FFASTBYP_TESTMODE (1 << 0) /* Bit 0: Oscillator test mode */
/* Reset control registers */
+
+#define CGU_SOFTRESET (1 << 0) /* Bit 0: in all of the reset control registers */
+
/* APB0_RESETN_SOFT register, address 0x13004c10 */
#define CGU_APB0RST_RESET (1 << 0) /* Bit 0: Reserved */
@@ -1414,7 +1426,7 @@
/* DMA_PNRES_SOFT register, address 0x13004cc0 */
-#define CGU_DMA_RST_RESET (1 << 0) /* Bit 0: Reset for DMA */
+#define CGU_DMARST_RESET (1 << 0) /* Bit 0: Reset for DMA */
/* NANDFLASH_CTRL_ECC_RESET_N_SOFT register, address 0x13004cc4 */
@@ -1628,6 +1640,7 @@
************************************************************************************************/
#ifndef __ASSEMBLY__
+
/************************************************************************************************
* Public Data
************************************************************************************************/
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_cgudrvr.h b/nuttx/arch/arm/src/lpc313x/lpc313x_cgudrvr.h
index 5d3089191..558a00433 100755
--- a/nuttx/arch/arm/src/lpc313x/lpc313x_cgudrvr.h
+++ b/nuttx/arch/arm/src/lpc313x/lpc313x_cgudrvr.h
@@ -45,6 +45,7 @@
************************************************************************/
#include <nuttx/config.h>
+#include "up_arch.h"
#include "lpc313x_cgu.h"
/************************************************************************
@@ -238,7 +239,7 @@ enum lpc313x_clockid_e
CLKID_MPMCCFGCLK3, /* 28 MPMC_CFG_CLK3 */
CLKID_INTCCLK, /* 29 INTC_CLK */
- /* Domain 1: AHB0APB0BASE */
+ /* Domain 1: AHB0APB0_BASE */
CLKID_AHB2APB0PCLK, /* 30 AHB_TO_APB0_PCLK */
CLKID_EVENTROUTERPCLK, /* 31 EVENT_ROUTER_PCLK */
@@ -251,7 +252,7 @@ enum lpc313x_clockid_e
CLKID_OTPPCLK, /* 38 OTP_PCLK (Reserved on LPC313X) */
CLKID_RNGPCLK, /* 39 RNG_PCLK */
- /* Domain 2: AHB0APB1BASE */
+ /* Domain 2: AHB0APB1_BASE */
CLKID_AHB2APB1PCLK, /* 40 AHB_TO_APB1_PCLK */
CLKID_TIMER0PCLK, /* 41 TIMER0_PCLK */
@@ -264,7 +265,7 @@ enum lpc313x_clockid_e
CLKID_I2C0PCLK, /* 48 I2C0_PCLK */
CLKID_I2C1PCLK, /* 49 I2C1_PCLK */
- /* Domain 3: AHB0APB2BASE */
+ /* Domain 3: AHB0APB2_BASE */
CLKID_AHB2APB2PCLK, /* 50 AHB_TO_APB2_PCLK */
CLKID_PCMPCLK, /* 51 PCM_PCLK */
@@ -333,6 +334,68 @@ enum lpc313x_clockid_e
CLKID_SYSCLKO /* 91 SYSCLK_O */
};
+/* Indices into the CGU configuration reset control registers */
+
+enum lpc313x_resetid_e
+{
+ RESETID_APB0RST, /* 4 AHB part of AHB_TO_APB0 bridge (Reserved) */
+ RESETID_AHB2APB0RST, /* 5 APB part of AHB_TO_APB0 bridge (Reserved) */
+ RESETID_APB1RST, /* 6 AHB part of AHB_TO_APB1 bridge */
+ RESETID_AHB2PB1RST, /* 7 APB part of AHB_TO_APB1 bridge */
+ RESETID_APB2RST, /* 8 AHB part of AHB_TO_APB2 bridge */
+ RESETID_AHB2APB2RST, /* 9 APB part of AHB_TO_APB2 bridge */
+ RESETID_APB3RST, /* 10 AHB part of AHB_TO_APB3 bridge */
+ RESETID_AHB2APB3RST, /* 11 APB part of AHB_TO_APB3 bridge */
+ RESETID_APB4RST, /* 12 AHB_TO_APB4 bridge */
+ RESETID_AHB2INTCRST, /* 13 AHB_TO_INTC */
+ RESETID_AHB0RST, /* 14 AHB0 */
+ RESETID_EBIRST, /* 15 EBI */
+ RESETID_PCMAPBRST, /* 16 APB domain of PCM */
+ RESETID_PCMCLKIPRST, /* 17 synchronous clk_ip domain of PCM */
+ RESETID_PCMRSTASYNC, /* 18 asynchronous clk_ip domain of PCM */
+ RESETID_TIMER0RST, /* 19 Timer0 */
+ RESETID_TIMER1RST, /* 20 Timer1 */
+ RESETID_TIMER2RST, /* 21 Timer2 */
+ RESETID_TIMER3RST, /* 22 Timer3 */
+ RESETID_ADCPRST, /* 23 controller of 10 bit ADC Interface */
+ RESETID_ADCRST, /* 24 A/D converter of ADC Interface */
+ RESETID_PWMRST, /* 25 PWM */
+ RESETID_UARTRST, /* 26 UART/IrDA */
+ RESETID_I2C0RST, /* 27 I2C0 */
+ RESETID_I2C1RST, /* 28 I2C1 */
+ RESETID_I2SCFGRST, /* 29 I2S_Config */
+ RESETID_I2SNSOFRST, /* 30 NSOF counter of I2S_CONFIG */
+ RESETID_EDGEDETRST, /* 31 Edge_det */
+ RESETID_I2STXFF0RST, /* 32 I2STX_FIFO_0 */
+ RESETID_I2STXIF0RST, /* 33 I2STX_IF_0 */
+ RESETID_I2STXFF1RST, /* 34 I2STX_FIFO_1 */
+ RESETID_I2STXIF1RST, /* 35 I2STX_IF_1 */
+ RESETID_I2SRXFF0RST, /* 36 I2SRX_FIFO_0 */
+ RESETID_I2SRXIF0RST, /* 37 I2SRX_IF_0 */
+ RESETID_I2SRXFF1RST, /* 38 I2SRX_FIFO_1 */
+ RESETID_I2SRXIF1RST, /* 39 I2SRX_IF_1 */
+ RESETID_RESERVED40, /* 40 Reserved */
+ RESETID_RESERVED41, /* 41 Reserved */
+ RESETID_RESERVED42, /* 42 Reserved */
+ RESETID_RESERVED43, /* 43 Reserved */
+ RESETID_RESERVED44, /* 44 Reserved */
+ RESETID_LCDRST, /* 45 LCD Interface */
+ RESETID_SPIRSTAPB, /* 46 apb_clk domain of SPI */
+ RESETID_SPIRSTIP, /* 47 ip_clk domain of SPI */
+ RESETID_DMARST, /* 48 DMA */
+ RESETID_NANDECCRST, /* 49 Nandflash Controller ECC clock */
+ RESETID_NANDAESRST, /* 50 Nandflash Controller AES clock (reserved for lpc313x) */
+ RESETID_NANDCTRLRST, /* 51 Nandflash Controller */
+ RESETID_RNG, /* 52 RNG */
+ RESETID_SDMMCRST, /* 53 MCI (on AHB clock) */
+ RESETID_SDMMCRSTCKIN, /* 54 CI synchronous (on IP clock) */
+ RESETID_USBOTGAHBRST, /* 55 USB_OTG */
+ RESETID_REDCTLRST, /* 56 Redundancy Controller */
+ RESETID_AHBMPMCHRST, /* 57 MPMC */
+ RESETID_AHBMPMCRFRST, /* 58 refresh generator used for MPMC */
+ RESETID_INTCRST, /* 59 Interrupt Controller */
+};
+
/************************************************************************
* Public Data
************************************************************************/
@@ -412,6 +475,16 @@ static inline void lpc313x_disableclock(enum lpc313x_clockid_e clkid)
************************************************************************/
/************************************************************************
+ * Name: lpc313x_softreset
+ *
+ * Description:
+ * Perform a soft reset on the specified module.
+ *
+ ************************************************************************/
+
+EXTERN void lpc313x_softreset(enum lpc313x_resetid_e resetid);
+
+/************************************************************************
* Name: lpc313x_clkdomain
*
* Description:
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_softreset.c b/nuttx/arch/arm/src/lpc313x/lpc313x_softreset.c
new file mode 100755
index 000000000..9e8ecfab3
--- /dev/null
+++ b/nuttx/arch/arm/src/lpc313x/lpc313x_softreset.c
@@ -0,0 +1,90 @@
+/************************************************************************
+ * arch/arm/src/lpc313x/lpc313x_softreset.c
+ *
+ * Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * References:
+ * - UM10314 LPC3130/31 User manual Rev. 1.01 — 9 September 2009
+ * - lpc313x.cdl.drivers.zip example driver code
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdint.h>
+
+#include "up_arch.h"
+#include "lpc313x_cgudrvr.h"
+
+/************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: lpc313x_softreset
+ *
+ * Description:
+ * Perform a soft reset on the specified module.
+ *
+ ************************************************************************/
+
+void lpc313x_softreset(enum lpc313x_resetid_e resetid)
+{
+ uint32_t address = LPC313X_CGU_SOFTRST(resetid);
+ volatile int i;
+
+ /* Clear and set the register */
+
+ putreg32(0, address);
+
+ /* Delay a bit */
+
+ for (i = 0;i < 1000; i++);
+
+ /* Then set the the soft reset bit */
+
+ putreg32(CGU_SOFTRESET, address);
+}
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_timerisr.c b/nuttx/arch/arm/src/lpc313x/lpc313x_timerisr.c
new file mode 100755
index 000000000..4893924ec
--- /dev/null
+++ b/nuttx/arch/arm/src/lpc313x/lpc313x_timerisr.c
@@ -0,0 +1,162 @@
+/****************************************************************************
+ * arch/arm/src/lpc313x/lpc313x_timerisr.c
+ *
+ * Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ * Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <time.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+#include <arch/board/board.h>
+
+#include "clock_internal.h"
+#include "up_internal.h"
+#include "up_arch.h"
+
+#include "lpc313x_timer.h"
+#include "lpc313x_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: up_timerisr
+ *
+ * Description:
+ * The timer ISR will perform a variety of services for various portions
+ * of the systems.
+ *
+ ****************************************************************************/
+
+int up_timerisr(int irq, uint32_t *regs)
+{
+ /* Clear the lattched timer interrupt (Writing any value to the CLEAR register
+ * clears the interrupt generated by the counter timer
+ */
+
+ putreg32(1, LPC313X_TIMER0_CLEAR);
+
+ /* Process timer interrupt */
+
+ sched_process_timer();
+ return 0;
+}
+
+/****************************************************************************
+ * Function: up_timerinit
+ *
+ * Description:
+ * This function is called during start-up to initialize
+ * the timer interrupt.
+ *
+ ****************************************************************************/
+
+void up_timerinit(void)
+{
+ uint32_t regval;
+ uint64_t load;
+ uint64_t freq;
+
+ /* Enable the timer0 system clock */
+
+ lpc313x_enableclock(CLKID_TIMER0PCLK);
+
+ /* Soft reset the timer0 module so that we start in a known state */
+
+ lpc313x_softreset(RESETID_TIMER0RST);
+
+ /* Set timer load register to 10mS (100Hz). First, get the frequency
+ * of the timer0 module clock (in the AHB0APB1_BASE domain (2)).
+ */
+
+ freq = (uint64_t)lpc313x_clkfreq(CLKID_TIMER0PCLK, DOMAINID_AHB0APB1);
+
+ /* If the clock is >1MHz, use pre-dividers */
+
+ regval = getreg32(LPC313X_TIMER0_CTRL);
+ if (freq > 1000000)
+ {
+ /* Use the divide by 16 pre-divider */
+
+ regval &= ~TIMER_CTRL_PRESCALE_MASK;
+ regval |= TIMER_CTRL_PRESCALE_DIV16;
+ freq >>= 4;
+ }
+
+ load =((freq * (uint64_t)10000) / 1000000);
+ putreg32((uint32_t)load, LPC313X_TIMER0_LOAD);
+
+ /* Set periodic mode */
+
+ regval |= TIMER_CTRL_PERIODIC;
+ putreg32(regval, LPC313X_TIMER0_CTRL);
+
+ /* Attach the timer interrupt vector */
+
+ (void)irq_attach(LPC313X_IRQ_TMR0, (xcpt_t)up_timerisr);
+
+ /* Clear any latched timer interrupt (Writing any value to the CLEAR register
+ * clears the latched interrupt generated by the counter timer)
+ */
+
+ putreg32(1, LPC313X_TIMER0_CLEAR);
+
+ /* Enable timers (starts counting) */
+
+ regval |= TIMER_CTRL_ENABLE;
+ putreg32(regval, LPC313X_TIMER0_CTRL);
+
+ /* Enable timer match interrupts in the interrupt controller */
+
+ up_enable_irq(LPC313X_IRQ_TMR0);
+}