diff options
Diffstat (limited to 'bsps/powerpc/tqm8xx/dev/clock.c')
| -rw-r--r-- | bsps/powerpc/tqm8xx/dev/clock.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/bsps/powerpc/tqm8xx/dev/clock.c b/bsps/powerpc/tqm8xx/dev/clock.c deleted file mode 100644 index 49500fedd1..0000000000 --- a/bsps/powerpc/tqm8xx/dev/clock.c +++ /dev/null @@ -1,207 +0,0 @@ -/* clock.c - * - * This routine initializes the PIT on the MPC8xx. - * The tick frequency is specified by the bsp. - */ - -/* - * 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: - * - * COPYRIGHT (c) 1989-2007. - * 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 <rtems/clockdrv.h> -#include <rtems/libio.h> -#include <rtems/powerpc/powerpc.h> - -#include <stdlib.h> /* for atexit() */ -#include <mpc8xx.h> -#include <bsp.h> - -volatile uint32_t Clock_driver_ticks; -extern volatile m8xx_t m8xx; -extern int BSP_get_clock_irq_level(void); -extern uint32_t bsp_clicks_per_usec; - -/* - * Prototypes - */ -rtems_isr Clock_isr(rtems_vector_number vector); -void Clock_exit( void ); -void clockOn(void* unused); -void clockOff(void* unused); -int clockIsOn(void* unused); -void Install_clock(rtems_isr_entry clock_isr); -void ReInstall_clock(rtems_isr_entry new_clock_isr); - -/* - * ISR Handler - */ -rtems_isr Clock_isr(rtems_vector_number vector) -{ - m8xx.piscr |= M8xx_PISCR_PS; - Clock_driver_ticks++; - rtems_clock_tick(); -} - -void clockOn(void* unused) -{ - unsigned desiredLevel; - uint32_t pit_value; - uint32_t extclk; - bool force_prescaler = false; - uint32_t immr_val; - - if (bsp_clicks_per_usec == 0) { - /* - * oscclk is too low for PIT, compute extclk and derive PIT from there - */ - /* - * determine external input clock by examining the PLL settings - * this must be done differently depending on type of PLL - */ - _mfspr(immr_val,M8xx_IMMR); - if (8 == ((immr_val & 0x0000FF00) >> 8)) { - /* - * for MPC866: complex PLL - */ - uint32_t plprcr_val; - uint32_t mfn_value; - uint32_t mfd_value; - uint32_t mfi_value; - uint32_t pdf_value; - uint32_t s_value; - - plprcr_val = m8xx.plprcr; - mfn_value = (plprcr_val & (0xf8000000)) >> (31- 4); - mfd_value = (plprcr_val & (0x07c00000)) >> (31- 9); - s_value = (plprcr_val & (0x00300000)) >> (31-11); - mfi_value = (plprcr_val & (0x000f0000)) >> (31-15); - pdf_value = (plprcr_val & (0x00000006)) >> (31-30); - extclk = (((uint64_t)bsp_clock_speed) - * ((pdf_value + 1) * (mfd_value + 1)) - / (mfi_value * (mfd_value + 1) + mfn_value) - * (1 << s_value)); - } - else { - /* - * for MPC860/850 etc: simple PLL - */ - uint32_t mf_value; - mf_value = m8xx.plprcr >> 20; - extclk = bsp_clock_speed / (mf_value+1); - } - pit_value = (extclk - / 1000 - / 4 - * rtems_configuration_get_microseconds_per_tick() - / 1000); - m8xx.sccr |= (1<<23); - force_prescaler = true; - } - else { - pit_value = (rtems_configuration_get_microseconds_per_tick() * - bsp_clicks_per_usec); - - m8xx.sccr &= ~(1<<23); - } - - if ((pit_value > 0xffff) || force_prescaler) { - /* - * try to activate prescaler - * NOTE: divider generates odd values now... - */ - pit_value = pit_value / 128; - m8xx.sccr |= (1<<24); - } - else { - m8xx.sccr &= ~(1<<24); - } - - if (pit_value > 0xffff) { /* pit is only 16 bits long */ - rtems_fatal_error_occurred(-1); - } - m8xx.pitc = pit_value - 1; - - desiredLevel = BSP_get_clock_irq_level(); - /* set PIT irq level, enable PIT, PIT interrupts */ - /* and clear int. status */ - m8xx.piscr = M8xx_PISCR_PIRQ(desiredLevel) | - M8xx_PISCR_PTE | M8xx_PISCR_PS | M8xx_PISCR_PIE; -} - -/* - * Called via atexit() - * Remove the clock interrupt handler by setting handler to NULL - */ -void clockOff(void* unused) -{ - /* disable PIT and PIT interrupts */ - m8xx.piscr &= ~(M8xx_PISCR_PTE | M8xx_PISCR_PIE); -} - -int clockIsOn(void* unused) -{ - if (m8xx.piscr & M8xx_PISCR_PIE) - return 1; - return 0; -} - -/* - * 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_isr_entry clock_isr) -{ - Clock_driver_ticks = 0; - - BSP_connect_clock_handler (clock_isr); - atexit(Clock_exit); -} - -void ReInstall_clock(rtems_isr_entry new_clock_isr) -{ - BSP_connect_clock_handler (new_clock_isr); -} - -rtems_device_driver Clock_initialize( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - Install_clock( Clock_isr ); - - return RTEMS_SUCCESSFUL; -} |