mirror of
https://github.com/apache/nuttx.git
synced 2026-06-07 17:33:08 +08:00
Bring programmable clock logic from SAMA5 to SAMV7
This commit is contained in:
Gregory Nutt
@@ -113,7 +113,7 @@ endif
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CHIP_ASRCS =
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CHIP_CSRCS = sam_start.c sam_clockconfig.c sam_irq.c sam_allocateheap.c
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CHIP_CSRCS += sam_lowputc.c sam_serial.c sam_gpio.c
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CHIP_CSRCS += sam_lowputc.c sam_serial.c sam_gpio.c sam_pck.c
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# Configuration-dependent SAMV7 files
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@@ -163,7 +163,7 @@
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*/
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#define PMC_USBCLK (1 << 5) /* Bit 5: Enable USB FS Clock */
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#define PMC_PCK(n) (1 << ((n) + 8)
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#define PMC_PCK(n) (1 << ((n) + 8))
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# define PMC_PCK0 (1 << 8) /* Bit 8: Programmable Clock 0 Output Enable */
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# define PMC_PCK1 (1 << 9) /* Bit 9: Programmable Clock 1 Output Enable */
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# define PMC_PCK2 (1 << 10) /* Bit 10: Programmable Clock 2 Output Enable */
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@@ -0,0 +1,254 @@
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/****************************************************************************
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* arch/arm/src/samv7/sam_pck.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/board/board.h>
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#include "chip/sam_pinmap.h"
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#include "up_arch.h"
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#include "sam_gpio.h"
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#include "sam_pck.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: sam_pck_configure
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*
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* Description:
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* Configure a programmable clock output. The selected PCK is programmed
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* to the selected frequency using either PLLA or the MCK as the source
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* clock (depending on the value of the selected frequency). The clock
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* is initially disabled. You must call sam_pck_enable() to enable the
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* clock after it has been configured.
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*
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* Input Parameters:
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* pckid - Identifies the programmable clock output (0, 1, or 2)
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* clocksrc - MCK or SCK. If MCK is selected, the logic will automatically
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* select the PLLACK clock if it seems like a better choice.
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* frequency - Defines the desired frequency. The exact frequency may
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* not be attainable. In this case, frequency is interpreted to be
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* a not-to-exceed frequency.
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*
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* Returned Value:
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* The actual frequency of the clock output.
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*
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****************************************************************************/
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uint32_t sam_pck_configure(enum pckid_e pckid, enum pckid_clksrc_e clksrc,
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uint32_t frequency)
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{
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uint32_t regval;
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uint32_t clkin;
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uint32_t actual;
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uint32_t pres;
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/* Pick a clock source. Several are possible but only MCK, PLLA, the
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* MAINCK,or SCK are supported here.
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*/
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switch (clksrc)
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{
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case PCKSRC_MCK: /* Source clock = MCK or PLLACK */
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{
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/* Pick either the MCK or the PLLACK, whichever will best realize
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* the target frequency.
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*/
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DEBUGASSERT(BOARD_MCK_FREQUENCY < BOARD_PLLA_FREQUENCY);
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/* Pick the PLLACK if it seems like a better choice */
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if (frequency <= BOARD_MCK_FREQUENCY ||
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frequency < BOARD_PLLA_FREQUENCY / 64)
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{
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regval = PMC_PCK_CSS_MCK;
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clkin = BOARD_MCK_FREQUENCY;
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}
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else
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{
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regval = PMC_PCK_CSS_PLLA;
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clkin = BOARD_PLLA_FREQUENCY;
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}
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}
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break;
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case PCKSRC_MAINCK: /* Source clock = MAIN clock */
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regval = PMC_PCK_CSS_MAIN;
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clkin = BOARD_MAINOSC_FREQUENCY;
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break;
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case PCKSRC_SCK: /* Source clock = SCK */
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regval = PMC_PCK_CSS_SLOW;
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clkin = BOARD_SLOWCLK_FREQUENCY;
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break;
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default:
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dbg("ERROR: Unknown clock source\n");
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return 0;
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}
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/* Programmable Clock frequency is selected clock freqency divided by PRES + 1 */
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pres = clkin / frequency;
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if (pres < 1)
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{
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pres = 1;
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}
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else if (pres > (PMC_PCK_PRES_MASK + 1))
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{
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pres = PMC_PCK_PRES_MASK + 1;
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}
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regval |= PMC_PCK_PRES(pres - 1);
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actual = frequency / pres;
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/* Disable the programmable clock, configure the PCK output pin, then set
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* the selected configuration.
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*/
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switch (pckid)
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{
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#ifdef GPIO_PMC_PCK0
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case PCK0:
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putreg32(PMC_PCK0, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK0);
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putreg32(regval, SAM_PMC_PCK0);
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break;
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#endif
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#ifdef GPIO_PMC_PCK1
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case PCK1:
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putreg32(PMC_PCK1, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK1);
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putreg32(regval, SAM_PMC_PCK1);
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break;
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#endif
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#ifdef GPIO_PMC_PCK2
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case PCK2:
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putreg32(PMC_PCK2, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK2);
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putreg32(regval, SAM_PMC_PCK2);
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break;
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#endif
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#ifdef GPIO_PMC_PCK3
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case PCK3:
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putreg32(PMC_PCK3, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK3);
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putreg32(regval, SAM_PMC_PCK3);
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break;
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#endif
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#ifdef GPIO_PMC_PCK4
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case PCK4:
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putreg32(PMC_PCK4, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK4);
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putreg32(regval, SAM_PMC_PCK4);
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break;
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#endif
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#ifdef GPIO_PMC_PCK5
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case PCK5:
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putreg32(PMC_PCK5, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK5);
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putreg32(regval, SAM_PMC_PCK5);
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break;
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#endif
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#ifdef GPIO_PMC_PCK6
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case PCK6:
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putreg32(PMC_PCK6, SAM_PMC_SCDR);
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(void)cam_configgpio(GPIO_PMC_PCK6);
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putreg32(regval, SAM_PMC_PCK6);
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break;
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#endif
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default:
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return -EINVAL;
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}
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/* And return the actual frequency */
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return actual;
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}
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/****************************************************************************
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* Function: sam_pck_enable
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*
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* Description:
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* Enable or disable a programmable clock output.
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*
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* Input Parameters:
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* pckid - Identifies the programmable clock output (0, 1, or 2)
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* enable - True: enable the clock output, False: disable the clock output
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sam_pck_enable(enum pckid_e pckid, bool enable)
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{
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uintptr_t regaddr;
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uint32_t regval;
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/* Select the bit in the PMC_SDER or PMC_SCER corresponding to the
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* programmable clock.
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*/
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regval = PMC_PCK(pckid);
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/* Select the SDER or SCER */
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regaddr = enable ? SAM_PMC_SCER : SAM_PMC_SCDR;
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/* And do the deead */
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putreg32(regval, regaddr);
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}
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@@ -0,0 +1,136 @@
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/************************************************************************************
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* arch/arm/src/samv7/sam_pck.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 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
|
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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||||
*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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* 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
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARPCKNG IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAMV7_SAM_PCK_H
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#define __ARCH_ARM_SRC_SAMV7_SAM_PCK_H
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include "chip.h"
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#include "chip/sam_pmc.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/************************************************************************************
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* Public Types
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************************************************************************************/
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/* Identifies the programmable clock */
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enum pckid_e
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{
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PCK0 = 0,
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PCK1,
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PCK2
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};
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enum pckid_clksrc_e
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{
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PCKSRC_MCK = 0, /* Source clock is the master clock (MCK) or PLLA output (PLLACK) */
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PCKSRC_MAINCK, /* Source clock is the main clock (probably the XTAL) */
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PCKSRC_SCK /* Source clock is the slow clock (SCK) */
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};
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Function: sam_pck_configure
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*
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* Description:
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* Configure a programmable clock output. The selected PCK is programmed
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* to the selected frequency using either PLLA or the MCK as the source
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* clock (depending on the value of the selected frequency). The clock
|
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* is initially disabled. You must call sam_pck_enable() to enable the
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* clock after it has been configured.
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*
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* Input Parameters:
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* pckid - Identifies the programmable clock output (0, 1, or 2)
|
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* clocksrc - MCK or SCK. If MCK is selected, the logic will automatically
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* select the PLLACK clock if it seems like a better choice.
|
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* frequency - Defines the desired frequency. The exact frequency may
|
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* not be attainable. In this case, frequency is interpreted to be
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* a not-to-exceed frequency.
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*
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* Returned Value:
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* The actual frequency of the clock output.
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*
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****************************************************************************/
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uint32_t sam_pck_configure(enum pckid_e pckid, enum pckid_clksrc_e clksrc,
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uint32_t frequency);
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/****************************************************************************
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* Function: sam_pck_enable
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*
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* Description:
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* Enable or disable a programmable clock output.
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*
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* Input Parameters:
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* pckid - Identifies the programmable clock output (0, 1, or 2)
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* enable - True: enable the clock output, False: disable the clock output
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sam_pck_enable(enum pckid_e pckid, bool enable);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_ARM_SRC_SAMV7_SAM_PCK_H */
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Reference in New Issue
Block a user