[3cfd520] | 1 | /* |
---|
| 2 | * Clock Driver for MCF5272 CPU |
---|
| 3 | * |
---|
| 4 | * This driver initailizes timer1 on the MCF5272 as the |
---|
| 5 | * main system clock |
---|
| 6 | * |
---|
| 7 | * Copyright 2004 Cogent Computer Systems |
---|
| 8 | * Author: Jay Monkman <jtm@lopingdog.com> |
---|
| 9 | * |
---|
| 10 | * Based on MCF5206 clock driver by |
---|
| 11 | * Victor V. Vengerov <vvv@oktet.ru> |
---|
| 12 | * |
---|
| 13 | * Based on work: |
---|
| 14 | * David Fiddes, D.J@fiddes.surfaid.org |
---|
| 15 | * http://www.calm.hw.ac.uk/davidf/coldfire/ |
---|
| 16 | * |
---|
| 17 | * COPYRIGHT (c) 1989-1998. |
---|
| 18 | * On-Line Applications Research Corporation (OAR). |
---|
| 19 | * Copyright assigned to U.S. Government, 1994. |
---|
| 20 | * |
---|
| 21 | * The license and distribution terms for this file may be |
---|
| 22 | * found in the file LICENSE in this distribution or at |
---|
| 23 | * |
---|
| 24 | * http://www.OARcorp.com/rtems/license.html. |
---|
| 25 | * |
---|
| 26 | * ckinit.c,v 1.1 2001/10/26 19:32:40 joel Exp |
---|
| 27 | */ |
---|
| 28 | |
---|
| 29 | #include <stdlib.h> |
---|
| 30 | #include <bsp.h> |
---|
| 31 | #include <rtems/libio.h> |
---|
| 32 | #include <mcf5272/mcf5272.h> |
---|
| 33 | |
---|
| 34 | /* |
---|
| 35 | * Clock_driver_ticks is a monotonically increasing counter of the |
---|
| 36 | * number of clock ticks since the driver was initialized. |
---|
| 37 | */ |
---|
| 38 | volatile rtems_unsigned32 Clock_driver_ticks; |
---|
| 39 | |
---|
| 40 | |
---|
| 41 | /* |
---|
| 42 | * These are set by clock driver during its init |
---|
| 43 | */ |
---|
| 44 | |
---|
| 45 | rtems_device_major_number rtems_clock_major = ~0; |
---|
| 46 | rtems_device_minor_number rtems_clock_minor; |
---|
| 47 | |
---|
| 48 | rtems_isr (*rtems_clock_hook)(rtems_vector_number) = NULL; |
---|
| 49 | |
---|
| 50 | /* Clock_isr -- |
---|
| 51 | * This handles the timer interrupt by clearing the timer's interrupt |
---|
| 52 | * flag and announcing the clock tick to the system. |
---|
| 53 | * |
---|
| 54 | * PARAMETERS: |
---|
| 55 | * vector - timer interrupt vector number |
---|
| 56 | |
---|
| 57 | * RETURNS: |
---|
| 58 | * none |
---|
| 59 | */ |
---|
| 60 | rtems_isr |
---|
| 61 | Clock_isr (rtems_vector_number vector) |
---|
| 62 | { |
---|
| 63 | /* Clear pending interrupt... */ |
---|
| 64 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
---|
| 65 | |
---|
| 66 | /* Announce the clock tick */ |
---|
| 67 | Clock_driver_ticks++; |
---|
| 68 | rtems_clock_tick(); |
---|
| 69 | if (rtems_clock_hook != NULL) { |
---|
| 70 | rtems_clock_hook(vector); |
---|
| 71 | } |
---|
| 72 | } |
---|
| 73 | |
---|
| 74 | |
---|
| 75 | /* Clock_exit -- |
---|
| 76 | * This shuts down the timer if it was enabled and removes it |
---|
| 77 | * from the MCF5206E interrupt mask. |
---|
| 78 | * |
---|
| 79 | * PARAMETERS: |
---|
| 80 | * none |
---|
| 81 | * |
---|
| 82 | * RETURNS: |
---|
| 83 | * none |
---|
| 84 | */ |
---|
| 85 | void |
---|
| 86 | Clock_exit(void) |
---|
| 87 | { |
---|
| 88 | if (BSP_Configuration.ticks_per_timeslice) { |
---|
| 89 | unsigned32 icr; |
---|
| 90 | /* disable all timer1 interrupts */ |
---|
| 91 | icr = g_intctrl_regs->icr1; |
---|
| 92 | icr = icr & ~(MCF5272_ICR1_TMR1_MASK | MCF5272_ICR1_TMR1_PI); |
---|
| 93 | icr |= (MCF5272_ICR1_TMR1_IPL(0) | MCF5272_ICR1_TMR1_PI); |
---|
| 94 | g_intctrl_regs->icr1 = icr; |
---|
| 95 | |
---|
| 96 | /* reset timer1 */ |
---|
| 97 | g_timer_regs->tmr1 = MCF5272_TMR_CLK_STOP; |
---|
| 98 | |
---|
| 99 | /* clear pending */ |
---|
| 100 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
---|
| 101 | } |
---|
| 102 | } |
---|
| 103 | |
---|
| 104 | |
---|
| 105 | /* Install_clock -- |
---|
| 106 | * This initialises timer1 with the BSP timeslice config value |
---|
| 107 | * as a reference and sets up the interrupt handler for clock ticks. |
---|
| 108 | * |
---|
| 109 | * PARAMETERS: |
---|
| 110 | * clock_isr - clock interrupt handler routine |
---|
| 111 | * |
---|
| 112 | * RETURNS: |
---|
| 113 | * none. |
---|
| 114 | */ |
---|
| 115 | static void |
---|
| 116 | Install_clock(rtems_isr_entry clock_isr) |
---|
| 117 | { |
---|
| 118 | unsigned32 icr; |
---|
| 119 | Clock_driver_ticks = 0; |
---|
| 120 | if (BSP_Configuration.ticks_per_timeslice) { |
---|
| 121 | |
---|
| 122 | /* Register the interrupt handler */ |
---|
| 123 | set_vector(clock_isr, BSP_INTVEC_TMR1, 1); |
---|
| 124 | |
---|
| 125 | /* Reset timer 1 */ |
---|
| 126 | g_timer_regs->tmr1 = MCF5272_TMR_RST; |
---|
| 127 | g_timer_regs->tmr1 = MCF5272_TMR_CLK_STOP; |
---|
| 128 | g_timer_regs->tmr1 = MCF5272_TMR_RST; |
---|
| 129 | g_timer_regs->tcn1 = 0; /* reset counter */ |
---|
| 130 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
---|
| 131 | |
---|
| 132 | /* Set Timer 1 prescaler so that it counts in microseconds */ |
---|
| 133 | g_timer_regs->tmr1 = ( |
---|
| 134 | ((((BSP_SYSTEM_FREQUENCY / 1000000) - 1) << MCF5272_TMR_PS_SHIFT) | |
---|
| 135 | MCF5272_TMR_CE_DISABLE | |
---|
| 136 | MCF5272_TMR_ORI | |
---|
| 137 | MCF5272_TMR_FRR | |
---|
| 138 | MCF5272_TMR_CLK_MSTR | |
---|
| 139 | MCF5272_TMR_RST)); |
---|
| 140 | |
---|
| 141 | /* Set the timer timeout value from the BSP config */ |
---|
| 142 | g_timer_regs->trr1 = BSP_Configuration.microseconds_per_tick - 1; |
---|
| 143 | |
---|
| 144 | /* Feed system frequency to the timer */ |
---|
| 145 | g_timer_regs->tmr1 |= MCF5272_TMR_CLK_MSTR; |
---|
| 146 | |
---|
| 147 | /* Configure timer1 interrupts */ |
---|
| 148 | icr = g_intctrl_regs->icr1; |
---|
| 149 | icr = icr & ~(MCF5272_ICR1_TMR1_MASK | MCF5272_ICR1_TMR1_PI); |
---|
| 150 | icr |= (MCF5272_ICR1_TMR1_IPL(BSP_INTLVL_TMR1) | MCF5272_ICR1_TMR1_PI); |
---|
| 151 | g_intctrl_regs->icr1 = icr; |
---|
| 152 | |
---|
| 153 | /* Register the driver exit procedure so we can shutdown */ |
---|
| 154 | atexit(Clock_exit); |
---|
| 155 | } |
---|
| 156 | } |
---|
| 157 | |
---|
| 158 | |
---|
| 159 | /* Clock_initialize -- |
---|
| 160 | * This is called to setup the clock driver. It calls the hardware |
---|
| 161 | * setup function and make the driver major/minor values available |
---|
| 162 | * for other. |
---|
| 163 | * |
---|
| 164 | * PARAMETERS: |
---|
| 165 | * major - clock device major number |
---|
| 166 | * minor - clock device minor number |
---|
| 167 | * pargp - device driver initialization argument (not used) |
---|
| 168 | * |
---|
| 169 | * RETURNS: |
---|
| 170 | * RTEMS status code |
---|
| 171 | */ |
---|
| 172 | rtems_device_driver |
---|
| 173 | Clock_initialize(rtems_device_major_number major, |
---|
| 174 | rtems_device_minor_number minor, |
---|
| 175 | void *pargp) |
---|
| 176 | { |
---|
| 177 | Install_clock (Clock_isr); |
---|
| 178 | |
---|
| 179 | /* Make major/minor avail to others such as shared memory driver */ |
---|
| 180 | rtems_clock_major = major; |
---|
| 181 | rtems_clock_minor = minor; |
---|
| 182 | |
---|
| 183 | return RTEMS_SUCCESSFUL; |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | |
---|
| 187 | /* Clock_control -- |
---|
| 188 | * I/O control (IOCTL) function for Clock driver. At this moment this |
---|
| 189 | * just runs the interrupt handler or re-registers the interrupt handler |
---|
| 190 | * on request. |
---|
| 191 | * |
---|
| 192 | * PARAMETERS: |
---|
| 193 | * major - clock major device number |
---|
| 194 | * minor - clock minor device number |
---|
| 195 | * pargp - pointer to IOCTL arguments |
---|
| 196 | * |
---|
| 197 | * RETURNS: |
---|
| 198 | * RTEMS status code |
---|
| 199 | */ |
---|
| 200 | rtems_device_driver |
---|
| 201 | Clock_control(rtems_device_major_number major, |
---|
| 202 | rtems_device_minor_number minor, |
---|
| 203 | void *pargp) |
---|
| 204 | { |
---|
| 205 | rtems_unsigned32 isrlevel; |
---|
| 206 | rtems_libio_ioctl_args_t *args = pargp; |
---|
| 207 | |
---|
| 208 | if (args) |
---|
| 209 | { |
---|
| 210 | /* |
---|
| 211 | * This is hokey, but until we get a defined interface |
---|
| 212 | * to do this, it will just be this simple... |
---|
| 213 | */ |
---|
| 214 | if (args->command == rtems_build_name('I', 'S', 'R', ' ')) |
---|
| 215 | { |
---|
| 216 | Clock_isr(BSP_INTVEC_TMR1); |
---|
| 217 | } |
---|
| 218 | else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) |
---|
| 219 | { |
---|
| 220 | rtems_interrupt_disable( isrlevel ); |
---|
| 221 | (void) set_vector( args->buffer, BSP_INTVEC_TMR1, 1 ); |
---|
| 222 | rtems_interrupt_enable( isrlevel ); |
---|
| 223 | } |
---|
| 224 | } |
---|
| 225 | return RTEMS_SUCCESSFUL; |
---|
| 226 | } |
---|