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SAMA5 PCK: Add support for programmable clock outputs

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This commit is contained in:
Gregory Nutt 2013-11-14 11:16:04 -06:00
parent 2036f600d7
commit 66111ef582
7 changed files with 358 additions and 4 deletions
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2
arch/arm/src/lpc31xx/lpc31_usbdev.c
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@ -2507,7 +2507,7 @@ void up_usbinitialize(void)
}
}
/* Enable USB to AHB clock and to Event router*/
/* Enable USB to AHB clock and to Event router */
lpc31_enableclock (CLKID_USBOTGAHBCLK);
lpc31_enableclock (CLKID_EVENTROUTERPCLK);

5
arch/arm/src/sama5/Make.defs
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@ -93,8 +93,9 @@ CHIP_ASRCS =
# SAMA5-specific C source files
CHIP_CSRCS = sam_allocateheap.c sam_boot.c sam_clockconfig.c sam_memories.c
CHIP_CSRCS += sam_pio.c sam_irq.c sam_lowputc.c sam_serial.c sam_timerisr.c
CHIP_CSRCS = sam_allocateheap.c sam_boot.c sam_clockconfig.c sam_irq.c
CHIP_CSRCS += sam_lowputc.c sam_memories.c sam_pck.c sam_pio.c sam_serial.c
CHIP_CSRCS += sam_timerisr.c
# Configuration dependent C and assembly language files

2
arch/arm/src/sama5/chip/sam_isi.h
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@ -171,7 +171,7 @@
/* ISI Preview Decimation Factor Register */
#define ISI_PDECF_MASK (0xff) /* Bits 0-7: Decimation Factor /
#define ISI_PDECF_MASK (0xff) /* Bits 0-7: Decimation Factor */
/* ISI CSC YCrCb To RGB Set 0 Register */

2
arch/arm/src/sama5/chip/sam_pmc.h
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@ -134,6 +134,8 @@
#define PMC_SMDCK (1 << 4) /* Bit 4: SMD Clock */
#define PMC_UHP (1 << 6) /* Bit 6: USB Host OHCI Clocks */
#define PMC_UDP (1 << 7) /* Bit 7: USB Device Clock */
#define PMC_PCKN(n) (1 << ((int)(n) + 8))
#define PMC_PCK0 (1 << 8) /* Bit 8: Programmable Clock 0 Output */
#define PMC_PCK1 (1 << 9) /* Bit 9: Programmable Clock 1 Output */
#define PMC_PCK2 (1 << 10) /* Bit 10: Programmable Clock 2 Output */

1
arch/arm/src/sama5/sam_ethernet.h
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@ -119,6 +119,7 @@
# error ETH1 PHY unrecognized
# endif
#endif
/************************************************************************************
* Public Functions
************************************************************************************/

225
arch/arm/src/sama5/sam_pck.c Normal file
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@ -0,0 +1,225 @@
/****************************************************************************
* arch/arm/src/sama5/sam_pck.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <debug.h>
#include "sam_isi.h"
#ifdef CONFIG_SAMA5_ISI
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: sam_pck_configure
*
* Description:
* Configure a programmable clock output. The selected PCK is programmed
* to the selected frequency using either PLLA or the MCK as the source
* clock (depending on the value of the selected frequency). The clock
* is initially disabled. You must call sam_pck_enable() to enable the
* clock after it has been configured.
*
* Input Parameters:
* pckid - Identifies the programmable clock output (0, 1, or 2)
* frequency - Defines the desired frequency. The exact frequency may
* not be attainable. In this case, frequency is interpreted to be
* a not-to-exceed frequency.
*
* Returned Value:
* The actual frequency of the clock output.
*
****************************************************************************/
uint32_t sam_pck_configure(enum pckid_e pckid, uint32_t frequency)
{
uint32_t regval;
uint32_t clkin;
/* Pick a clock source. Several are possible but only MCK or PLLA is
* chosen here.
*/
DEBUGASSERT(BOARD_MCK_FREQUENCY < BOARD_PLLA_FREQUENCY)
if (frequency <= BOARD_MCK_FREQUENCY ||
frequency < BOARD_PLLA_FREQUENCY / 64)
{
regval = PMC_PCK_CSS_MCK;
clkin = BOARD_MCK_FREQUENCY;
}
else
{
regval = PMC_PCK_CSS_PLLA;
clkin = BOARD_PLLA_FREQUENCY;
}
/* The the larger smallest divisor that does not exceed the requested
* frequency.
*/
if (frequency > clkin)
{
regval |= PMC_PCK_PRES_DIV1;
actual = clkin;
}
else if (frequency > (clkin >> 1))
{
regval |= PMC_PCK_PRES_DIV2;
actual = clkin >> 1;
}
else if (frequency > (clkin >> 2))
{
regval |= PMC_PCK_PRES_DIV4;
actual = clkin >> 2;
}
else if (frequency > (clkin >> 3))
{
regval |= PMC_PCK_PRES_DIV8;
actual = clkin >> 3;
}
else if (frequency > (clkin >> 4))
{
regval |= PMC_PCK_PRES_DIV16;
actual = clkin >> 4;
}
else if (frequency > (clkin >> 5))
{
regval |= PMC_PCK_PRES_DIV32;
actual = clkin >> 5;
}
else if (frequency > (clkin >> 6))
{
regval |= PMC_PCK_PRES_DIV64;
actual = clkin >> 6;
}
else
{
sdbg("ERROR: frequency cannot be realized.\n");
sdbg(" frequency=%d MCK=%d\n",
frequency, clkin);
return -ERANGE;
}
/* Disable the programmable clock then set the selected configuration */
switch (pckid)
{
case PCK0:
putreg32(PMC_PCK0, SAM_PMC_SCDR);
putreg32(regval, SAM_PMC_PCK0);
break;
case PCK1:
putreg32(PMC_PCK1, SAM_PMC_SCDR);
putreg32(regval, SAM_PMC_PCK1);
break;
case PCK2:
putreg32(PMC_PCK2, SAM_PMC_SCDR);
putreg32(regval, SAM_PMC_PCK2);
break;
default:
return -EINVAL;
}
/* And return the actual frequency */
return actual;
}
/****************************************************************************
* Function: sam_pck_enable
*
* Description:
* Enable or disable a programmable clock output.
*
* Input Parameters:
* pckid - Identifies the programmable clock output (0, 1, or 2)
* enable - True: enable the clock output, False: disable the clock output
*
* Returned Value:
* None
*
****************************************************************************/
void sam_pck_enable(enum pckid_e pckid, bool enable)
{
uintptr_t regaddr;
uint32_t regval;
/* Select the bit in the PMC_SDER or PMC_SCER corresponding to the
* programmable clock.
*/
regval = PMC_PCKN(pckid);
/* Select the SDER or SCER */
regaddr = enable ? SAM_PMC_SCER : SAM_PMC_SCDR;
/* And do the deead */
putreg32(regval, regaddr);
}
#endif /* CONFIG_SAMA5_ISI && CONFIG_SAMA5_EMAC */

125
arch/arm/src/sama5/sam_pck.h Normal file
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@ -0,0 +1,125 @@
/************************************************************************************
* arch/arm/src/sama5/sam_pck.h
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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) ARPCKNG IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
#ifndef __ARCH_ARM_SRC_SAMA5_SAM_PCK_H
#define __ARCH_ARM_SRC_SAMA5_SAM_PCK_H
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include "chip.h"
#include "chip/sam_pmc.h"
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/************************************************************************************
* Public Types
************************************************************************************/
/* Identifies the programmable clock */
enum pckid_e
{
PCK0 = 0,
PCK1,
PCK2
};
/************************************************************************************
* Public Functions
************************************************************************************/
#ifndef __ASSEMBLY__
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Function: sam_pck_configure
*
* Description:
* Configure a programmable clock output. The selected PCK is programmed
* to the selected frequency using either PLLA or the MCK as the source
* clock (depending on the value of the selected frequency). The clock
* is initially disabled. You must call sam_pck_enable() to enable the
* clock after it has been configured.
*
* Input Parameters:
* pckid - Identifies the programmable clock output (0, 1, or 2)
* frequency - Defines the desired frequency. The exact frequency may
* not be attainable. In this case, frequency is interpreted to be
* a not-to-exceed frequency.
*
* Returned Value:
* The actual frequency of the clock output.
*
****************************************************************************/
uint32_t sam_pck_configure(enum pckid_e pckid, uint32_t frequency);
/****************************************************************************
* Function: sam_pck_enable
*
* Description:
* Enable or disable a programmable clock output.
*
* Input Parameters:
* pckid - Identifies the programmable clock output (0, 1, or 2)
* enable - True: enable the clock output, False: disable the clock output
*
* Returned Value:
* None
*
****************************************************************************/
void sam_pck_enable(enum pckid_e pckid, bool enable);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __ARCH_ARM_SRC_SAMA5_SAM_PCK_H */