diff options
Diffstat (limited to 'c/src/lib/libbsp/sh/gensh1/clock/ckinit.c')
-rw-r--r-- | c/src/lib/libbsp/sh/gensh1/clock/ckinit.c | 306 |
1 files changed, 0 insertions, 306 deletions
diff --git a/c/src/lib/libbsp/sh/gensh1/clock/ckinit.c b/c/src/lib/libbsp/sh/gensh1/clock/ckinit.c deleted file mode 100644 index 6faaf27f58..0000000000 --- a/c/src/lib/libbsp/sh/gensh1/clock/ckinit.c +++ /dev/null @@ -1,306 +0,0 @@ -/* - * This file contains the clock driver the Hitachi SH 703X - */ - -/* - * Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and - * Bernd Becker (becker@faw.uni-ulm.de) - * - * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - * - * COPYRIGHT (c) 1998. - * 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.rtems.org/license/LICENSE. - */ - -#include <rtems.h> - -#include <stdlib.h> - -#include <rtems/clockdrv.h> -#include <rtems/score/sh_io.h> -#include <rtems/score/sh.h> -#include <rtems/score/ispsh7032.h> -#include <rtems/score/iosh7032.h> - -extern uint32_t bsp_clicks_per_second; - -#ifndef CLOCKPRIO -#define CLOCKPRIO 10 -#endif - -#define I_CLK_PHI_1 0 -#define I_CLK_PHI_2 1 -#define I_CLK_PHI_4 2 -#define I_CLK_PHI_8 3 - -/* - * Set I_CLK_PHI to one of the I_CLK_PHI_X values from above to choose - * a PHI/X clock rate. - */ - -#define I_CLK_PHI I_CLK_PHI_4 -#define CLOCK_SCALE (1<<I_CLK_PHI) - -#define ITU0_STARTMASK 0xfe -#define ITU0_SYNCMASK 0xfe -#define ITU0_MODEMASK 0xfe -#define ITU0_TCRMASK (0x20 | I_CLK_PHI) -#define ITU_STAT_MASK 0xf8 -#define ITU0_IRQMASK 0xfe -#define ITU0_TIERMASK 0x01 -#define IPRC_ITU0_MASK 0xff0f -#define ITU0_TIORVAL 0x08 - -/* - * clicks_per_tick := clicks_per_sec * usec_per_tick - * - * This is a very expensive function ;-) - * - * Below are two variants: - * 1. A variant applying integer arithmetics, only. - * 2. A variant applying floating point arithmetics - * - * The floating point variant pulls in the fmath routines when linking, - * resulting in slightly larger executables for applications that do not - * apply fmath otherwise. However, the imath variant is significantly slower - * than the fmath variant and more complex. - * - * Assuming that most applications will not use fmath, but are critical - * in memory size constraints, we apply the integer variant. - * - * To the sake of simplicity, we might abandon one of both variants in - * future. - */ -static unsigned int sh_clicks_per_tick( - unsigned int clicks_per_sec, - unsigned int usec_per_tick -) -{ -#if 1 - unsigned int clicks_per_tick = 0 ; - - unsigned int b = clicks_per_sec ; - unsigned int c = 1000000 ; - unsigned int d = 1 ; - unsigned int a = ( ( b / c ) * usec_per_tick ) / d; - - clicks_per_tick += a ; - - while ( ( b %= c ) > 0 ) - { - c /= 10 ; - d *= 10 ; - a = ( ( b / c ) * usec_per_tick ) / d ; - clicks_per_tick += a ; - } - return clicks_per_tick ; -#else - double fclicks_per_tick = - ((double) clicks_per_sec * (double) usec_per_tick) / 1000000.0 ; - return (uint32_t) fclicks_per_tick ; -#endif -} - -/* - * The interrupt vector number associated with the clock tick device - * driver. - */ - -#define CLOCK_VECTOR IMIA0_ISP_V - -/* - * Clock_driver_ticks is a monotonically increasing counter of the - * number of clock ticks since the driver was initialized. - */ - -volatile uint32_t Clock_driver_ticks; - -void Clock_exit( void ); -static rtems_isr Clock_isr( rtems_vector_number vector ); - -/* - * Clock_isrs is the number of clock ISRs until the next invocation of - * the RTEMS clock tick routine. The clock tick device driver - * gets an interrupt once a millisecond and counts down until the - * length of time between the user configured microseconds per tick - * has passed. - */ - -uint32_t Clock_isrs; /* ISRs until next tick */ -static uint32_t Clock_isrs_const; /* only calculated once */ - -/* - * The previous ISR on this clock tick interrupt vector. - */ -rtems_isr_entry Old_ticker; - -/* - * Isr Handler - */ -static rtems_isr Clock_isr( - rtems_vector_number vector -) -{ - /* - * bump the number of clock driver ticks since initialization - * - * determine if it is time to announce the passing of tick as configured - * to RTEMS through the rtems_clock_tick directive - * - * perform any timer dependent tasks - */ - uint8_t temp; - - /* reset the flags of the status register */ - temp = read8( ITU_TSR0) & ITU_STAT_MASK; - write8( temp, ITU_TSR0); - - Clock_driver_ticks++ ; - - if( Clock_isrs == 1) - { - rtems_clock_tick(); - Clock_isrs = Clock_isrs_const; - } - else - { - Clock_isrs-- ; - } -} - -/* - * Install_clock - * - * Install a clock tick handler and reprograms the chip. This - * is used to initially establish the clock tick. - */ -static void Install_clock( - rtems_isr_entry clock_isr -) -{ - uint8_t temp8 = 0; - uint32_t microseconds_per_tick; - uint32_t cclicks_per_tick; - uint16_t Clock_limit; - - /* - * Initialize the clock tick device driver variables - */ - - Clock_driver_ticks = 0; - - if ( rtems_configuration_get_microseconds_per_tick() != 0 ) - microseconds_per_tick = rtems_configuration_get_microseconds_per_tick() ; - else - microseconds_per_tick = 10000 ; /* 10000 us */ - - /* clock clicks per tick */ - cclicks_per_tick = sh_clicks_per_tick( - bsp_clicks_per_second / CLOCK_SCALE, microseconds_per_tick ); - - Clock_isrs_const = cclicks_per_tick >> 16 ; - if ( ( cclicks_per_tick | 0xffff ) > 0 ) - Clock_isrs_const++ ; - Clock_limit = cclicks_per_tick / Clock_isrs_const ; - Clock_isrs = Clock_isrs_const; - - rtems_interrupt_catch( Clock_isr, CLOCK_VECTOR, &Old_ticker ); - /* - * Hardware specific initialize goes here - */ - - /* stop Timer 0 */ - temp8 = read8( ITU_TSTR) & ITU0_STARTMASK; - write8( temp8, ITU_TSTR); - - /* set initial counter value to 0 */ - write16( 0, ITU_TCNT0); - - /* Timer 0 runs independent */ - temp8 = read8( ITU_TSNC) & ITU0_SYNCMASK; - write8( temp8, ITU_TSNC); - - /* Timer 0 normal mode */ - temp8 = read8( ITU_TMDR) & ITU0_MODEMASK; - write8( temp8, ITU_TMDR); - - /* TCNT is cleared by GRA ; internal clock /4 */ - write8( ITU0_TCRMASK , ITU_TCR0); - - /* use GRA without I/O - pins */ - write8( ITU0_TIORVAL, ITU_TIOR0); - - /* reset flags of the status register */ - temp8 = read8( ITU_TSR0) & ITU_STAT_MASK; - write8( temp8, ITU_TSR0); - - /* Irq if is equal GRA */ - temp8 = read8( ITU_TIER0) | ITU0_TIERMASK; - write8( temp8, ITU_TIER0); - - /* set interrupt priority */ - if( sh_set_irq_priority( CLOCK_VECTOR, CLOCKPRIO ) != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED); - - /* set counter limits */ - write16( Clock_limit, ITU_GRA0); - - /* start counter */ - temp8 = read8( ITU_TSTR) |~ITU0_STARTMASK; - write8( temp8, ITU_TSTR); - - /* - * Schedule the clock cleanup routine to execute if the application exits. - */ - - atexit( Clock_exit ); -} - -/* - * Clean up before the application exits - */ -void Clock_exit( void ) -{ - uint8_t temp8 = 0; - - /* turn off the timer interrupts */ - /* set interrupt priority to 0 */ - if( sh_set_irq_priority( CLOCK_VECTOR, 0 ) != RTEMS_SUCCESSFUL) - rtems_fatal_error_occurred( RTEMS_UNSATISFIED); - -/* - * temp16 = read16( ITU_TIER0) & IPRC_ITU0_IRQMASK; - * write16( temp16, ITU_TIER0); - */ - - /* stop counter */ - temp8 = read8( ITU_TSTR) & ITU0_STARTMASK; - write8( temp8, ITU_TSTR); - - /* old vector shall not be installed */ -} - -/* - * Clock_initialize - * - * Device driver entry point for clock tick driver initialization. - */ - -rtems_device_driver Clock_initialize( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - Install_clock( Clock_isr ); - - return RTEMS_SUCCESSFUL; -} |