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[/] [or1k/] [tags/] [nog_patch_63/] [or1ksim/] [peripheral/] [gpio.c] - Rev 1374
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/* gpio.h -- GPIO code simulation Copyright (C) 2001 Erez Volk, erez@mailandnews.comopencores.org This file is part of OpenRISC 1000 Architectural Simulator. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <string.h> #include "config.h" #ifdef HAVE_INTTYPES_H #include <inttypes.h> #endif #include "port.h" #include "arch.h" #include "abstract.h" #include "gpio.h" #include "gpio_i.h" #include "sim-config.h" #include "pic.h" #include "vapi.h" #include "debug.h" #include "sched.h" static void gpio_vapi_read( unsigned long id, unsigned long data, void *dat ); static uint32_t gpio_read32( oraddr_t addr, void *dat ); static void gpio_write32( oraddr_t addr, uint32_t value, void *dat ); static void gpio_external_clock( unsigned long value, struct gpio_device *gpio ); static void gpio_device_clock( struct gpio_device *gpio ); /* Initialize all parameters and state */ void gpio_reset( void *dat ) { struct gpio_device *gpio = dat; if ( gpio->baseaddr != 0 ) { /* Possibly connect to VAPI */ if ( gpio->base_vapi_id ) { vapi_install_multi_handler( gpio->base_vapi_id, GPIO_NUM_VAPI_IDS, gpio_vapi_read, dat ); } } } /* Dump status */ void gpio_status( void *dat ) { struct gpio_device *gpio = dat; if ( gpio->baseaddr == 0 ) return; PRINTF( "\nGPIO at 0x%"PRIxADDR":\n", gpio->baseaddr ); PRINTF( "RGPIO_IN : 0x%08lX\n", gpio->curr.in ); PRINTF( "RGPIO_OUT : 0x%08lX\n", gpio->curr.out ); PRINTF( "RGPIO_OE : 0x%08lX\n", gpio->curr.oe ); PRINTF( "RGPIO_INTE : 0x%08lX\n", gpio->curr.inte ); PRINTF( "RGPIO_PTRIG : 0x%08lX\n", gpio->curr.ptrig ); PRINTF( "RGPIO_AUX : 0x%08lX\n", gpio->curr.aux ); PRINTF( "RGPIO_CTRL : 0x%08lX\n", gpio->curr.ctrl ); PRINTF( "RGPIO_INTS : 0x%08lX\n", gpio->curr.ints ); } /* Wishbone read */ uint32_t gpio_read32( oraddr_t addr, void *dat ) { struct gpio_device *gpio = dat; addr -= gpio->baseaddr; switch( addr ) { case RGPIO_IN: return gpio->curr.in | gpio->curr.out; case RGPIO_OUT: return gpio->curr.out; case RGPIO_OE: return gpio->curr.oe; case RGPIO_INTE: return gpio->curr.inte; case RGPIO_PTRIG: return gpio->curr.ptrig; case RGPIO_AUX: return gpio->curr.aux; case RGPIO_CTRL: return gpio->curr.ctrl; case RGPIO_INTS: return gpio->curr.ints; } return 0; } /* Wishbone write */ void gpio_write32( oraddr_t addr, uint32_t value, void *dat ) { struct gpio_device *gpio = dat; addr -= gpio->baseaddr; switch( addr ) { case RGPIO_IN: debug( 5, "GPIO: Cannot write to RGPIO_IN\n" ); break; case RGPIO_OUT: gpio->next.out = value; break; case RGPIO_OE: gpio->next.oe = value; break; case RGPIO_INTE: gpio->next.inte = value; break; case RGPIO_PTRIG: gpio->next.ptrig = value; break; case RGPIO_AUX: gpio->next.aux = value; break; case RGPIO_CTRL: gpio->next.ctrl = value; break; case RGPIO_INTS: gpio->next.ints = value; break; } } /* Input from "outside world" */ void gpio_vapi_read( unsigned long id, unsigned long data, void *dat ) { unsigned which; struct gpio_device *gpio = dat; debug( 5, "GPIO: id %08lx, data %08lx\n", id, data ); which = id - gpio->base_vapi_id; switch( which ) { case GPIO_VAPI_DATA: debug( 4, "GPIO: Next input from VAPI = 0x%08lx (RGPIO_OE = 0x%08lx)\n", data, gpio->next.oe ); gpio->next.in = data; break; case GPIO_VAPI_AUX: gpio->auxiliary_inputs = data; break; case GPIO_VAPI_RGPIO_OE: gpio->next.oe = data; break; case GPIO_VAPI_RGPIO_INTE: gpio->next.inte = data; break; case GPIO_VAPI_RGPIO_PTRIG: gpio->next.ptrig = data; break; case GPIO_VAPI_RGPIO_AUX: gpio->next.aux = data; break; case GPIO_VAPI_RGPIO_CTRL: gpio->next.ctrl = data; break; case GPIO_VAPI_CLOCK: gpio_external_clock( data, gpio ); break; } /* Clock the device */ if ( !(gpio->curr.ctrl & RGPIO_CTRL_ECLK) ) gpio_device_clock( gpio ); } /* External Clock. */ static void gpio_external_clock( unsigned long value, struct gpio_device *gpio ) { int use_external_clock = ((gpio->curr.ctrl & RGPIO_CTRL_ECLK) == RGPIO_CTRL_ECLK); int negative_edge = ((gpio->curr.ctrl & RGPIO_CTRL_NEC) == RGPIO_CTRL_NEC); /* "Normalize" clock value */ value = (value != 0); gpio->next.external_clock = value; if ( use_external_clock && (gpio->next.external_clock != gpio->curr.external_clock) && (value != negative_edge) ) /* Make sure that in vapi_read, we don't clock the device */ if ( gpio->curr.ctrl & RGPIO_CTRL_ECLK ) gpio_device_clock( gpio ); } /* Report an interrupt to the sim */ void gpio_do_int( void *dat ) { struct gpio_device *gpio = dat; report_interrupt( gpio->irq ); } /* Clock as handld by one device. */ static void gpio_device_clock( struct gpio_device *gpio ) { /* Calculate new inputs and outputs */ gpio->next.in &= ~gpio->next.oe; /* Only input bits */ /* Replace requested output bits with aux input */ gpio->next.out = (gpio->next.out & ~gpio->next.aux) | (gpio->auxiliary_inputs & gpio->next.aux); gpio->next.out &= gpio->next.oe; /* Only output-enabled bits */ /* If any outputs changed, notify the world (i.e. vapi) */ if ( gpio->next.out != gpio->curr.out ) { debug( 4, "GPIO: New output 0x%08lx, RGPIO_OE = 0x%08lx\n", gpio->next.out, gpio->next.oe ); if ( gpio->base_vapi_id ) vapi_send( gpio->base_vapi_id + GPIO_VAPI_DATA, gpio->next.out ); } /* If any inputs changed and interrupt enabled, generate interrupt */ if ( gpio->next.in != gpio->curr.in ) { debug( 4, "GPIO: New input 0x%08lx\n", gpio->next.in ); if ( gpio->next.ctrl & RGPIO_CTRL_INTE ) { unsigned changed_bits = gpio->next.in ^ gpio->curr.in; /* inputs that have changed */ unsigned set_bits = changed_bits & gpio->next.in; /* inputs that have been set */ unsigned cleared_bits = changed_bits & gpio->curr.in; /* inputs that have been cleared */ unsigned relevant_bits = (gpio->next.ptrig & set_bits) | (~gpio->next.ptrig & cleared_bits); if ( relevant_bits & gpio->next.inte ) { debug( 3, "GPIO: Reporting interrupt %d\n", gpio->irq ); gpio->next.ctrl |= RGPIO_CTRL_INTS; gpio->next.ints |= relevant_bits & gpio->next.inte; /* Since we can't report an interrupt during a readmem/writemem * schedule the scheduler to do it. Read the comment above * report_interrupt in pic/pic.c */ SCHED_ADD( gpio_do_int, gpio, runtime.sim.cycles + 1 ); } } } /* Switch to values for next clock */ memcpy( &(gpio->curr), &(gpio->next), sizeof(gpio->curr) ); } /*---------------------------------------------------[ GPIO configuration ]---*/ void gpio_baseaddr(union param_val val, void *dat) { struct gpio_device *gpio = dat; gpio->baseaddr = val.addr_val; } void gpio_irq(union param_val val, void *dat) { struct gpio_device *gpio = dat; gpio->irq = val.int_val; } void gpio_base_vapi_id(union param_val val, void *dat) { struct gpio_device *gpio = dat; gpio->base_vapi_id = val.int_val; } void *gpio_sec_start(void) { struct gpio_device *new = malloc(sizeof(struct gpio_device)); if(!new) { fprintf(stderr, "Peripheral Test: Run out of memory\n"); exit(-1); } new->auxiliary_inputs = 0; memset(&new->curr, 0, sizeof(new->curr)); memset(&new->next, 0, sizeof(new->next)); return new; } void gpio_sec_end(void *dat) { struct gpio_device *gpio = dat; /* Register memory range */ register_memoryarea( gpio->baseaddr, GPIO_ADDR_SPACE, 4, 0, gpio_read32, gpio_write32, dat ); reg_sim_reset(gpio_reset, dat); reg_sim_stat(gpio_status, dat); } void reg_gpio_sec(void) { struct config_section *sec = reg_config_sec("gpio", NULL, NULL); reg_config_param(sec, "baseaddr", paramt_addr, gpio_baseaddr); reg_config_param(sec, "irq", paramt_int, gpio_irq); reg_config_param(sec, "base_vapi_id", paramt_int, gpio_base_vapi_id); }
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