/*===============================================================*\
| Project: RTEMS generic MPC5200 BSP |
+-----------------------------------------------------------------+
| File: clock.c
+-----------------------------------------------------------------+
| Partially based on the code references which are named below. |
| Adaptions, modifications, enhancements and any recent parts of |
| the code are: |
| Copyright (c) 2005 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| The license and distribution terms for this file may be |
| found in the file LICENSE in this distribution or at |
| |
| http://www.rtems.com/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| this file contains the clock driver functions |
+-----------------------------------------------------------------+
| date history ID |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 01.12.05 creation doe |
|*****************************************************************|
|*CVS information: |
|*(the following information is created automatically, |
|*do not edit here) |
|*****************************************************************|
|* $Log$
|* Revision 1.1 2005/12/31 05:09:25 ralf
|* New (CVS import Thomas Doerfler <Thomas.Doerfler@embedded-brains.de>'s
|* submission).
|*
|* Revision 1.9 2005/12/09 08:57:03 thomas
|* added/modifed file headers
|*
|* Revision 1.8 2005/12/06 14:30:42 thomas
|* updated name for peripheral register block
|*
|* Revision 1.7 2005/12/06 14:11:11 thomas
|* added EB file headers
|*
*
|*****************************************************************|
\*===============================================================*/
/***********************************************************************/
/* */
/* Module: clock.c */
/* Date: 07/17/2003 */
/* Purpose: RTEMS MPC5x00 clock driver */
/* */
/*---------------------------------------------------------------------*/
/* */
/* Description: Use one of the GPTs for time base generation */
/* instead of the decrementer. The routine initializes */
/* the General Purpose Timer GPT6 on the MPC5x00. */
/* The tick frequency is specified by the bsp. */
/* */
/*---------------------------------------------------------------------*/
/* */
/* Code */
/* References: Clock driver for PPC403 */
/* Module: clock.c */
/* Project: RTEMS 4.6.0pre1 / PPC403 BSP */
/* Version 1.16 */
/* Date: 2002/11/01 */
/* Author(s) / Copyright(s): */
/* */
/* Author: Jay Monkman (jmonkman@frasca.com) */
/* Copyright (C) 1998 by Frasca International, Inc. */
/* */
/* Derived from c/src/lib/libcpu/ppc/ppc403/clock/clock.c: */
/* */
/* Author: Andrew Bray <andy@i-cubed.co.uk> */
/* */
/* COPYRIGHT (c) 1995 by i-cubed ltd. */
/* */
/* To anyone who acknowledges that this file is provided "AS IS" */
/* without any express or implied warranty: */
/* permission to use, copy, modify, and distribute this file */
/* for any purpose is hereby granted without fee, provided that */
/* the above copyright notice and this notice appears in all */
/* copies, and that the name of i-cubed limited not be used in */
/* advertising or publicity pertaining to distribution of the */
/* software without specific, written prior permission. */
/* i-cubed limited makes no representations about the suitability */
/* of this software for any purpose. */
/* */
/* Derived from c/src/lib/libcpu/hppa1.1/clock/clock.c: */
/* */
/* Modifications for deriving timer clock from cpu system clock by */
/* Thomas Doerfler <td@imd.m.isar.de> */
/* for these modifications: */
/* COPYRIGHT (c) 1997 by IMD, Puchheim, Germany. */
/* */
/* COPYRIGHT (c) 1989-1999. */
/* On-Line Applications Research Corporation (OAR). */
/* */
/* The license and distribution terms for this file may be */
/* found in the file LICENSE in this distribution or at */
/* http://www.OARcorp.com/rtems/license.html. */
/* */
/* Modifications for PPC405GP by Dennis Ehlin */
/*---------------------------------------------------------------------*/
/* */
/* Partially based on the code references which are named above. */
/* Adaptions, modifications, enhancements and any recent parts of */
/* the code are under the right of */
/* */
/* IPR Engineering, Dachauer Straße 38, D-80335 München */
/* Copyright(C) 2003 */
/* */
/*---------------------------------------------------------------------*/
/* */
/* IPR Engineering makes no representation or warranties with */
/* respect to the performance of this computer program, and */
/* specifically disclaims any responsibility for any damages, */
/* special or consequential, connected with the use of this program. */
/* */
/*---------------------------------------------------------------------*/
/* */
/* Version history: 1.0 */
/* */
/***********************************************************************/
#include <bsp.h>
#include <rtems/bspIo.h>
#include "../irq/irq.h"
#include <rtems.h>
#include <rtems/clockdrv.h>
#include <rtems/libio.h>
#include <stdlib.h> /* for atexit() */
#include "../include/mpc5200.h"
volatile uint32_t Clock_driver_ticks;
void Clock_exit(void);
uint32_t counter_value;
volatile int ClockInitialized = 0;
/*
* These are set by clock driver during its init
*/
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_minor_number rtems_clock_minor;
/*
* ISR Handlers
*/
void mpc5200_gpt_clock_isr(rtems_irq_hdl_param handle)
{
uint32_t status;
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)handle;
status = gpt->status;
if(ClockInitialized && (status & GPT_STATUS_TEXP))
{
gpt->status |= GPT_STATUS_TEXP;
Clock_driver_ticks++;
rtems_clock_tick();
}
}
/*
* Initialize MPC5x00 GPT
*/
void mpc5200_init_gpt(uint32_t gpt_no)
{
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)(&mpc5200.gpt[gpt_no]);
gpt->status = GPT_STATUS_RESET;
gpt->emsel = GPT_EMSEL_CE | GPT_EMSEL_ST_CONT | GPT_EMSEL_INTEN | GPT_EMSEL_GPIO_OUT_HIGH | GPT_EMSEL_TIMER_MS_GPIO;
}
/*
* Set MPC5x00 GPT counter
*/
void mpc5200_set_gpt_count(uint32_t counter_value, uint32_t gpt_no)
{
uint32_t prescaler_value = 1;
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)(&mpc5200.gpt[gpt_no]);
/* Calculate counter/prescaler value, e.g. IPB_Clock=33MHz -> Int. every 0,3 nsecs. - 130 secs.*/
while((counter_value >= (1 << 16)) && (prescaler_value < (1 << 16)))
{
prescaler_value++;
counter_value /= prescaler_value;
}
counter_value = (uint16_t)counter_value;
gpt->count_in = (prescaler_value << 16) + counter_value;
}
/*
* Enable MPC5x00 GPT interrupt
*/
void mpc5200_enable_gpt_int(uint32_t gpt_no)
{
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)(&mpc5200.gpt[gpt_no]);
gpt->emsel |= GPT_EMSEL_CE | GPT_EMSEL_INTEN;
}
/*
* Disable MPC5x00 GPT interrupt
*/
void mpc5200_disable_gpt_int(uint32_t gpt_no)
{
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)(&mpc5200.gpt[gpt_no]);
gpt->emsel &= ~(GPT_EMSEL_CE | GPT_EMSEL_INTEN);
}
/*
* Check MPC5x00 GPT status
*/
uint32_t mpc5200_check_gpt_status(uint32_t gpt_no)
{
struct mpc5200_gpt *gpt = (struct mpc5200_gpt *)(&mpc5200.gpt[gpt_no]);
return ((gpt->emsel) & (GPT_EMSEL_CE | GPT_EMSEL_INTEN));
}
void clockOn(const rtems_irq_connect_data* irq)
{
uint32_t gpt_no;
gpt_no = BSP_SIU_IRQ_TMR0 - (irq->name);
counter_value = rtems_configuration_get_microseconds_per_tick() *
rtems_cpu_configuration_get_clicks_per_usec();
mpc5200_set_gpt_count(counter_value, (uint32_t)gpt_no);
mpc5200_enable_gpt_int((uint32_t)gpt_no);
Clock_driver_ticks = 0;
ClockInitialized = 1;
}
void clockOff(const rtems_irq_connect_data* irq)
{
uint32_t gpt_no;
gpt_no = BSP_SIU_IRQ_TMR0 - (irq->name);
mpc5200_disable_gpt_int((uint32_t)gpt_no);
ClockInitialized = 0;
}
int clockIsOn(const rtems_irq_connect_data* irq)
{
uint32_t gpt_no;
gpt_no = BSP_SIU_IRQ_TMR0 - (irq->name);
if(mpc5200_check_gpt_status(gpt_no) && ClockInitialized)
return ClockInitialized;
else
return 0;
}
int BSP_get_clock_irq_level()
{
/*
* Caution : if you change this, you must change the
* definition of BSP_PERIODIC_TIMER accordingly
*/
return BSP_PERIODIC_TIMER;
}
int BSP_disconnect_clock_handler (void)
{
rtems_irq_connect_data clockIrqData;
clockIrqData.name = BSP_PERIODIC_TIMER;
if (!BSP_get_current_rtems_irq_handler(&clockIrqData))
{
printk("Unable to stop system clock\n");
rtems_fatal_error_occurred(1);
}
return BSP_remove_rtems_irq_handler (&clockIrqData);
}
int BSP_connect_clock_handler (uint32_t gpt_no)
{
rtems_irq_hdl hdl = 0;
rtems_irq_connect_data clockIrqData;
/*
* Reinit structure
*/
clockIrqData.name = BSP_PERIODIC_TIMER;
if(!BSP_get_current_rtems_irq_handler(&clockIrqData))
{
printk("Unable to get system clock handler\n");
rtems_fatal_error_occurred(1);
}
if(!BSP_remove_rtems_irq_handler (&clockIrqData))
{
printk("Unable to remove current system clock handler\n");
rtems_fatal_error_occurred(1);
}
if ((gpt_no >= GPT0) ||
(gpt_no <= GPT7)) {
hdl = (rtems_irq_hdl_param )&mpc5200.gpt[gpt_no];
}
else {
printk("Unable to set system clock handler\n");
rtems_fatal_error_occurred(1);
}
clockIrqData.hdl = mpc5200_gpt_clock_isr;
clockIrqData.handle = (rtems_irq_hdl_param) hdl;
clockIrqData.on = clockOn;
clockIrqData.off = clockOff;
clockIrqData.isOn = clockIsOn;
return BSP_install_rtems_irq_handler (&clockIrqData);
}
/*
* Called via atexit()
* Remove the clock interrupt handler by setting handler to NULL
*/
void Clock_exit(void)
{
(void) BSP_disconnect_clock_handler ();
}
void Install_clock(rtems_device_minor_number gpt_no)
{
Clock_driver_ticks = 0;
counter_value = rtems_configuration_get_microseconds_per_tick() *
rtems_cpu_configuration_get_clicks_per_usec();
mpc5200_init_gpt((uint32_t)gpt_no);
mpc5200_set_gpt_count(counter_value, (uint32_t)gpt_no);
BSP_connect_clock_handler(gpt_no);
ClockInitialized = 1;
atexit(Clock_exit);
}
void ReInstall_clock(uint32_t gpt_no)
{
BSP_connect_clock_handler(gpt_no);
}
rtems_device_driver Clock_initialize
(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
/* force minor according to definitions in irq.h */
minor = BSP_PERIODIC_TIMER - BSP_SIU_IRQ_TMR0;
Install_clock((uint32_t)minor);
/*
* make major/minor avail to others such as shared memory driver
*/
rtems_clock_major = major;
rtems_clock_minor = minor;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver Clock_control
(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
) {
rtems_libio_ioctl_args_t *args = pargp;
/* forec minor according to definitions in irq.h */
minor = BSP_PERIODIC_TIMER - BSP_SIU_IRQ_TMR0;
if(args != 0) {
/*
* This is hokey, but until we get a defined interface
* to do this, it will just be this simple...
*/
if(args->command == rtems_build_name('I', 'S', 'R', ' ')) {
if ((minor >= GPT0) ||
(minor <= GPT7)) {
mpc5200_gpt_clock_isr((rtems_irq_hdl_param )&mpc5200.gpt[minor]);
}
else {
printk("Unable to call system clock handler\n");
rtems_fatal_error_occurred(1);
}
}
else if(args->command == rtems_build_name('N', 'E', 'W', ' ')) {
ReInstall_clock((uint32_t)minor);
}
}
return RTEMS_SUCCESSFUL;
}
