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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-11 17:05:13 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-05-11 17:05:13 +0000 |
commit | dcc3cf5161bebdcd28bc1a8a4cd563b3ce8c2fd6 (patch) | |
tree | bf964dd9f4ac9a1b83a2176e2a7c6092136bc0f8 /nuttx/arch | |
parent | ec87f216bcee185ec0d85fa58774cd7c6387af5f (diff) | |
download | px4-nuttx-dcc3cf5161bebdcd28bc1a8a4cd563b3ce8c2fd6.tar.gz px4-nuttx-dcc3cf5161bebdcd28bc1a8a4cd563b3ce8c2fd6.tar.bz2 px4-nuttx-dcc3cf5161bebdcd28bc1a8a4cd563b3ce8c2fd6.zip |
More lm3s6918 -- clocking + misc fixes
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1768 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch')
-rw-r--r-- | nuttx/arch/arm/src/lm3s/Make.defs | 2 | ||||
-rw-r--r-- | nuttx/arch/arm/src/lm3s/lm3s_syscontrol.c | 313 | ||||
-rw-r--r-- | nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h | 79 |
3 files changed, 392 insertions, 2 deletions
diff --git a/nuttx/arch/arm/src/lm3s/Make.defs b/nuttx/arch/arm/src/lm3s/Make.defs index 1d2fbdbdc..ded34b380 100644 --- a/nuttx/arch/arm/src/lm3s/Make.defs +++ b/nuttx/arch/arm/src/lm3s/Make.defs @@ -46,7 +46,7 @@ CMN_CSRCS = up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \ up_undefinedinsn.c up_usestack.c CHIP_ASRCS = -CHIP_CSRCS = lm3s_start.c +CHIP_CSRCS = lm3s_start.c lm3s_syscontrol.c lm3s_irq.c ifdef CONFIG_NET CHIP_CSRCS += lm3s_ethernet.c diff --git a/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.c b/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.c new file mode 100644 index 000000000..248588b09 --- /dev/null +++ b/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.c @@ -0,0 +1,313 @@ +/**************************************************************************** + * arch/arm/src/lm3s/lm3s_syscontrol.c + * arch/arm/src/chip/lm3s_syscontrol.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 <sys/types.h> + +#include <assert.h> +#include <debug.h> + +#include <nuttx/init.h> +#include <arch/board/board.h> + +#include "up_arch.h" +#include "up_internal.h" + +/**************************************************************************** + * Private Definitions + ****************************************************************************/ + +#define RCC_OSCMASK (SYSCON_RCC_IOSCDIS|SYSCON_RCC_MOSCDIS) +#define RCC_XTALMASK (SYSCON_RCC_XTAL_MASK|SYSCON_RCC_OSCSRC_MASK|SYSCON_RCC_PWRDN) +#define RCC2_XTALMASK (SYSCON_RCC2_USERCC2|SYSCON_RCC2_OSCSRC2_MASK|SYSCON_RCC2_PWRDN2) +#define RCC_DIVMASK (SYSCON_RCC_SYSDIV_MASK|SYSCON_RCC_USESYSDIV|SYSCON_RCC_IOSCDIS|SYSCON_RCC_MOSCDIS) +#define RCC2_DIVMASK (SYSCON_RCC2_SYSDIV2_MASK) +#define FAST_OSCDELAY (512*1024) +#define SLOW_OSCDELAY (4*1024) +#define PLLLOCK_DELAY (32*1024) + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lm3s_delay + * + * Description: + * Wait for the newly selected oscillator(s) to settle. This is tricky because + * the time that we wait can be significant and is determined by the previous + * clock setting, not the one that we are configuring. + * + ****************************************************************************/ + +static inline void lm3s_delay(uint32 delay) +{ + __asm__ __volatile__("1:\n" + "\tsubs %0, #1\n" + "\tbne 1b\n" + : "=r"(delay) : "r"(delay)); +} + +/**************************************************************************** + * Name: lm3s_oscdelay + * + * Description: + * Wait for the newly selected oscillator(s) to settle. This is tricky because + * the time that we wait can be significant and is determined by the previous + * clock setting, not the one that we are configuring. + * + ****************************************************************************/ + +static inline void lm3s_oscdelay(uint32 rcc, uint32 rcc2) +{ + /* Wait for the oscillator to stabilize. A smaller delay is used if the + * current clock rate is very slow. + */ + + uint32 delay = FAST_OSCDELAY; + + /* Are we currently using RCC2? */ + + if ((rcc2 & SYSCON_RCC2_USERCC2) != 0) + { + uint32 rcc2src = rcc2 & SYSCON_RCC2_OSCSRC2_MASK; + if ((rcc2src == SYSCON_RCC2_OSCSRC2_30KHZ) || + (rcc2src == SYSCON_RCC2_OSCSRC2_32KHZ)) + { + delay = SLOW_OSCDELAY; + } + } + + /* No.. using srce in RCC */ + + else + { + uint32 rccsrc = rcc & SYSCON_RCC_OSCSRC_MASK; + if (rccsrc == SYSCON_RCC_OSCSRC_30KHZ) + { + delay = SLOW_OSCDELAY; + } + } + + /* Then delay that number of loops */ + + lm3s_delay(delay); +} + +/**************************************************************************** + * Name: lm3s_plllock + * + * Description: + * The new RCC values have been selected... wait for the PLL to lock on + * + ****************************************************************************/ + +static inline void lm3s_plllock(void) +{ + uint32 delay; + + /* Loop until the lock is achieved or until a timeout occurs */ + + for (delay = PLLLOCK_DELAY; delay > 0; delay--) + { + /* Check if the PLL is locked on */ + + if (getreg32(LM3S_SYSCON_RIS) & SYSCON_IMC_PLLLIM) + { + /* Yes.. return now */ + + return; + } + } + + /* If we get here, then PLL lock was not achieved */ +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lm3s_clockconfig + * + * Description: + * Called to check to new clock based on desired rcc and rcc2 settings. + * This is use to set up the initial clocking but can be used later to + * support slow clocked, low power consumption modes. + * + ****************************************************************************/ + +void lm3s_clockconfig(uint32 newrcc, uint32 newrcc2) +{ + uint32 rcc; + uint32 rcc2; + + /* Get the current values of the RCC and RCC2 registers */ + + rcc = getreg32(LM3S_SYSCON_RCC); + rcc2 = getreg32(LM3S_SYSCON_RCC2); + + /* Temporarily bypass the PLL and system clock dividers */ + + rcc |= SYSCON_RCC_BYPASS; + rcc &= ~(SYSCON_RCC_USESYSDIV); + putreg32(rcc, LM3S_SYSCON_RCC); + + rcc2 |= SYSCON_RCC2_BYPASS2; + putreg32(rcc2, LM3S_SYSCON_RCC2); + + /* We are probably using the main oscillator. The main oscillator is disabled on + * reset and so probably must be enabled here. The internal oscillator is enabled + * on rest and if that is selected, most likely nothing needs to be done. + */ + + if (((rcc & SYSCON_RCC_MOSCDIS) && !(newrcc & SYSCON_RCC_MOSCDIS)) || + ((rcc & SYSCON_RCC_IOSCDIS) && !(newrcc & SYSCON_RCC_IOSCDIS))) + { + /* Enable any selected osciallators */ + + rcc &= (~RCC_OSCMASK|(newrcc & RCC_OSCMASK)); + putreg32(rcc, LM3S_SYSCON_RCC); + + /* Wait for the newly selected oscillator(s) to settle. This is tricky because + * the time that we wait can be significant and is determined by the previous + * clock setting, not the one that we are configuring. + */ + + lm3s_oscdelay(rcc, rcc2); + } + + /* Set the new crystal value, oscillator source and PLL configuration */ + + rcc &= ~RCC_XTALMASK; + rcc |= newrcc & RCC_XTALMASK; + + rcc2 &= ~RCC2_XTALMASK; + rcc2 |= newrcc2 & RCC2_XTALMASK; + + /* Clear the PLL lock interrupt */ + + putreg32(SYSCON_MISC_PLLLMIS, LM3S_SYSCON_MISC); + + /* Write the new RCC/RCC2 values. Order depends upon whether RCC2 or RCC + * is currently enabled. + */ + + if (rcc2 & SYSCON_RCC2_USERCC2) + { + putreg32(rcc2, LM3S_SYSCON_RCC2); + putreg32(rcc, LM3S_SYSCON_RCC); + } + else + { + putreg32(rcc, LM3S_SYSCON_RCC); + putreg32(rcc2, LM3S_SYSCON_RCC2); + } + + /* Wait for the new crystal value and oscillator source to take effect */ + + lm3s_delay(16); + + /* Set the requested system deivider and disable the non-selected osciallators */ + + rcc &= ~RCC_DIVMASK; + rcc |= newrcc & RCC_DIVMASK; + + rcc2 &= ~RCC2_DIVMASK; + rcc2 |= newrcc2 & RCC2_DIVMASK; + + /* Will the PLL output be used to clock the system? */ + + if ((newrcc & SYSCON_RCC_BYPASS) == 0) + { + /* Yes, wail untill the PLL is locked */ + + lm3s_plllock(); + + /* Then enable the PLL */ + + rcc &= ~SYSCON_RCC_BYPASS; + rcc2 &= ~SYSCON_RCC2_BYPASS2; + } + + /* Now we can set the final RCC/RCC2 values */ + + putreg32(rcc, LM3S_SYSCON_RCC); + putreg32(rcc2, LM3S_SYSCON_RCC2); + + /* Wait for the system divider to be effective */ + + lm3s_delay(6); +} + +/**************************************************************************** + * Name: up_clockconfig + * + * Description: + * Called early in the bootsequence (before .data and .bss are available) + * in order to configure initial clocking. + * + ****************************************************************************/ + +void up_clockconfig(void) +{ +#ifdef CONFIG_LM3S_REVA2 + /* Some early silicon returned an increase LDO voltage or 2.75V to work + * around a PLL bug + */ + + putreg32(SYSCON_LPDOPCTL_2750MV, LM3S_SYSCON_LDOPCTL); +#endif + + /* Set the clocking to run with the default settings provided in the board.h + * header file + */ + + lm3s_clockconfig(LM3S_RCC_VALUE, LM3S_RCC2_VALUE); +} + diff --git a/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h b/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h index 569b5632b..0b6f811cb 100644 --- a/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h +++ b/nuttx/arch/arm/src/lm3s/lm3s_syscontrol.h @@ -121,7 +121,7 @@ /* Device Identification 0 (DID0), offset 0x000 */ #define SYSCON_DID0_MINOR_SHIFT 0 /* Bits 7-0: Minor Revision of the device */ -#define SYSCON_DID0_MINRO_MASK (0xff << SYSCON_DID0_MINOR_SHIFT) +#define SYSCON_DID0_MINOR_MASK (0xff << SYSCON_DID0_MINOR_SHIFT) #define SYSCON_DID0_MAJOR_SHIFT 8 /* Bits 15-8: Major Revision of the device */ #define SYSCON_DID0_MAJOR_MASK (0xff << SYSCON_DID0_MAJOR_SHIFT) #define SYSCON_DID0_CLASS_SHIFT 16 /* Bits 23-16: Device Class */ @@ -229,6 +229,17 @@ #define SYSCON_LDOPCTL_VADJ_SHIFT 0 /* Bits 5-0: LDO Output Voltage */ #define SYSCON_LDOPCTL_VADJ_MASK (0x3f << SYSCON_LDOPCTL_VADJ_SHIFT) +# define SYSCON_LPDOPCTL_2500MV (0x00 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.5V (reset)*/ +# define SYSCON_LPDOPCTL_2450MV (0x01 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.45V */ +# define SYSCON_LPDOPCTL_2400MV (0x02 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.4V */ +# define SYSCON_LPDOPCTL_2350MV (0x03 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.35V */ +# define SYSCON_LPDOPCTL_2300MV (0x04 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.3V */ +# define SYSCON_LPDOPCTL_2250MV (0x05 << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.25V */ +# define SYSCON_LPDOPCTL_2750MV (0x1b << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.75V */ +# define SYSCON_LPDOPCTL_2700MV (0x1c << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.7V */ +# define SYSCON_LPDOPCTL_2650MV (0x1d << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.65V */ +# define SYSCON_LPDOPCTL_2600MV (0x1e << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.6V */ +# define SYSCON_LPDOPCTL_2550MV (0x1f << SYSCON_LDOPCTL_VADJ_SHIFT) /* 2.55V */ /* Software Reset Control 0 (SRCR0), offset 0x040 */ @@ -293,13 +304,34 @@ #define SYSCON_RCC_IOSCDIS (1 << 1) /* Bit 1: Internal Oscillator Disable */ #define SYSCON_RCC_OSCSRC_SHIFT 4 /* Bits 5-4: Oscillator Source */ #define SYSCON_RCC_OSCSRC_MASK (0x03 << SYSCON_RCC_OSCSRC_SHIFT) +# define SYSCON_RCC_OSCSRC_MOSC (0 << SYSCON_RCC_OSCSRC_SHIFT) /* Main oscillator */ +# define SYSCON_RCC_OSCSRC_IOSC (1 << SYSCON_RCC_OSCSRC_SHIFT) /* Internal oscillator (reset) */ +# define SYSCON_RCC_OSCSRC_IOSC4 (2 << SYSCON_RCC_OSCSRC_SHIFT) /* Internal oscillator / 4 */ +# define SYSCON_RCC_OSCSRC_30KHZ (3 << SYSCON_RCC_OSCSRC_SHIFT) /* 30KHz internal oscillator */ #define SYSCON_RCC_XTAL_SHIFT 6 /* Bits 9-6: Crystal Value */ #define SYSCON_RCC_XTAL_MASK (0x0f << SYSCON_RCC_XTAL_SHIFT) +# define SYSCON_RCC_XTAL1000KHZ ( 0 << SYSCON_RCC_XTAL_SHIFT) /* 1.0000MHz (NO PLL) */ +# define SYSCON_RCC_XTAL1843KHZ ( 1 << SYSCON_RCC_XTAL_SHIFT) /* 1.8432MHz (NO PLL) */ +# define SYSCON_RCC_XTAL2000KHZ ( 2 << SYSCON_RCC_XTAL_SHIFT) /* 2.0000MHz (NO PLL) */ +# define SYSCON_RCC_XTAL2580KHZ ( 3 << SYSCON_RCC_XTAL_SHIFT) /* 2.4576MHz (NO PLL) */ +# define SYSCON_RCC_XTAL3580KHZ ( 4 << SYSCON_RCC_XTAL_SHIFT) /* 3.5795MHz */ +# define SYSCON_RCC_XTAL3686KHZ ( 5 << SYSCON_RCC_XTAL_SHIFT) /* 3.6864MHz */ +# define SYSCON_RCC_XTAL4000KHZ ( 6 << SYSCON_RCC_XTAL_SHIFT) /* 4.0000MHz */ +# define SYSCON_RCC_XTAL4096KHZ ( 7 << SYSCON_RCC_XTAL_SHIFT) /* 4.0960MHz */ +# define SYSCON_RCC_XTAL4915KHZ ( 8 << SYSCON_RCC_XTAL_SHIFT) /* 4.9152MHz */ +# define SYSCON_RCC_XTAL5000KHZ ( 9 << SYSCON_RCC_XTAL_SHIFT) /* 5.0000MHz */ +# define SYSCON_RCC_XTAL5120KHZ (10 << SYSCON_RCC_XTAL_SHIFT) /* 5.1200MHz */ +# define SYSCON_RCC_XTAL6000KHZ (11 << SYSCON_RCC_XTAL_SHIFT) /* 6.0000MHz (reset value) */ +# define SYSCON_RCC_XTAL6144KHZ (12 << SYSCON_RCC_XTAL_SHIFT) /* 6.1440MHz */ +# define SYSCON_RCC_XTAL7373KHZ (13 << SYSCON_RCC_XTAL_SHIFT) /* 7.3728MHz */ +# define SYSCON_RCC_XTAL8000KHZ (14 << SYSCON_RCC_XTAL_SHIFT) /* 8.0000MHz */ +# define SYSCON_RCC_XTAL8192KHZ (15 << SYSCON_RCC_XTAL_SHIFT) /* 8.1920MHz */ #define SYSCON_RCC_BYPASS (1 << 11) /* Bit 11: PLL Bypass */ #define SYSCON_RCC_PWRDN (1 << 13) /* Bit 13: PLL Power Down */ #define SYSCON_RCC_USESYSDIV (1 << 22) /* Bit 22: Enable System Clock Divider */ #define SYSCON_RCC_SYSDIV_SHIFT 26 /* Bits 26-23: System Clock Divisor */ #define SYSCON_RCC_SYSDIV_MASK (0x0f << SYSCON_RCC_SYSDIV_SHIFT) +# define SYSCON_RCC_SYSDIV(n) ((n-1) << SYSCON_RCC_SYSDIV_SHIFT) #define SYSCON_RCC_ACG (1 << 27) /* Bit 27: Auto Clock Gating */ /* XTAL to PLL Translation (PLLCFG), offset 0x064 */ @@ -313,10 +345,16 @@ #define SYSCON_RCC2_OSCSRC2_SHIFT 4 /* Bits 6-4: Oscillator Source */ #define SYSCON_RCC2_OSCSRC2_MASK (0x07 << SYSCON_RCC2_OSCSRC2_SHIFT) +# define SYSCON_RCC2_OSCSRC2_MOSC (0 << SYSCON_RCC2_OSCSRC2_SHIFT) /* Main oscillator */ +# define SYSCON_RCC2_OSCSRC2_IOSC (1 << SYSCON_RCC2_OSCSRC2_SHIFT) /* Internal oscillator (reset) */ +# define SYSCON_RCC2_OSCSRC2_IOSC4 (2 << SYSCON_RCC2_OSCSRC2_SHIFT) /* Internal oscillator / 4 */ +# define SYSCON_RCC2_OSCSRC2_30KHZ (3 << SYSCON_RCC2_OSCSRC2_SHIFT) /* 30KHz internal oscillator */ +# define SYSCON_RCC2_OSCSRC2_32KHZ (7 << SYSCON_RCC2_OSCSRC2_SHIFT) /* 32.768KHz external oscillator */ #define SYSCON_RCC2_BYPASS2 (1 << 11) /* Bit 11: Bypass PLL */ #define SYSCON_RCC2_PWRDN2 (1 << 13) /* Bit 13: Power-Down PLL */ #define SYSCON_RCC2_SYSDIV2_SHIFT 23 /* Bits 28-23: System Clock Divisor */ #define SYSCON_RCC2_SYSDIV2_MASK (0x3f << SYSCON_RCC2_SYSDIV2_SHIFT) +# define SYSCON_RCC2_SYSDIV(n) ((n-1) << SYSCON_RCC2_SYSDIV2_SHIFT) #define SYSCON_RCC2_USERCC2 (1 << 31) /* Bit 31: Use RCC2 When set */ /* Run Mode Clock Gating Control Register 0 (RCGC0), offset 0x100 */ @@ -442,8 +480,47 @@ * Public Data ************************************************************************************/ +#ifndef __ASSEMBLY__ + +#undef EXTERN +#if defined(__cplusplus) +#define EXTERN extern "C" +extern "C" { +#else +#define EXTERN extern +#endif + /************************************************************************************ * Public Functions ************************************************************************************/ +/**************************************************************************** + * Name: lm3s_clockconfig + * + * Description: + * Called to check to new clock based on desired rcc and rcc2 settings. + * This is use to set up the initial clocking but can be used later to + * support slow clocked, low power consumption modes. + * + ****************************************************************************/ + +EXTERN void lm3s_clockconfig(uint32 newrcc, uint32 newrcc2); + +/**************************************************************************** + * Name: up_clockconfig + * + * Description: + * Called early in the bootsequence (before .data and .bss are available) + * in order to configure initial clocking. + * + ****************************************************************************/ + +EXTERN void up_clockconfig(void); + +#undef EXTERN +#if defined(__cplusplus) +} +#endif + +#endif /* __ASSEMBLY__ */ #endif /* __ARCH_ARM_SRC_LM3S_LM3S_SYSCONTROL_H */ |