Firebee/BaS_gcc
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d8601911215a9b33e48acea64739cbf7bc2cbb89
BaS_gcc/sys/BaS.c
Markus Fröschle d860191121 replaced DMA API routines by fresh download with originals 
moved more interrupt handlers to generalized handler
cleaned up lowlevel interrupt handling
fixed wrong assignment of interrupt masks
reformatted
2015-01-11 10:27:36 +00:00

457 lines
12 KiB
C
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/*
* BaS
*
* This file is part of BaS_gcc.
*
* BaS_gcc 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 3 of the License, or
* (at your option) any later version.
*
* BaS_gcc 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 BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2010 - 2012 F. Aschwanden
* Copyright 2011 - 2012 V. Riviere
* Copyright 2012 M. Froeschle
*/
#include <bas_types.h>
#include "MCF5475.h"
#include "startcf.h"
#include "sysinit.h"
#include "util.h"
#include "cache.h"
#include "bas_printf.h"
#include "bas_string.h"
#include "bas_types.h"
#include "sd_card.h"
#include "wait.h"
#include "diskio.h"
#include "ff.h"
#include "s19reader.h"
#include "mmu.h"
#include "dma.h"
#include "net.h"
#include "eth.h"
#include "nbuf.h"
#include "nif.h"
#include "fec.h"
#include "bootp.h"
#include "interrupts.h"
#include "exceptions.h"
#include "net_timer.h"
#include "pci.h"
#include "video.h"
//#define BAS_DEBUG
#if defined(BAS_DEBUG)
#define dbg(format, arg...) do { xprintf("DEBUG: %s(): " format, __FUNCTION__, ##arg); } while (0)
#else
#define dbg(format, arg...) do { ; } while (0)
#endif
#define err(format, arg...) do { xprintf("ERROR: %s(): " format, __FUNCTION__, ##arg); } while (0)
/* imported routines */
extern int vec_init();
/* Symbols from the linker script */
extern uint8_t _STRAM_END[];
#define STRAM_END ((uint32_t)_STRAM_END)
extern uint8_t _TOS[];
#define TOS ((uint32_t)_TOS) /* final TOS location */
extern uint8_t _FASTRAM_END[];
#define FASTRAM_END ((uint32_t)_FASTRAM_END)
extern uint8_t _EMUTOS[];
#define EMUTOS ((uint32_t)_EMUTOS) /* where EmuTOS is stored in flash */
extern uint8_t _EMUTOS_SIZE[];
#define EMUTOS_SIZE ((uint32_t)_EMUTOS_SIZE) /* size of EmuTOS, in bytes */
/*
* check if it is possible to transfer data to PIC
*/
static inline bool pic_txready(void)
{
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_TXRDY)
{
return true;
}
return false;
}
/*
* check if it is possible to receive data from PIC
*/
static inline bool pic_rxready(void)
{
if (MCF_PSC3_PSCSR & MCF_PSC_PSCSR_RXRDY)
{
return true;
}
return false;
}
void write_pic_byte(uint8_t value)
{
/*
* Wait until the transmitter is ready or 1000us are passed
*/
waitfor(1000, pic_txready);
/*
* Transmit the byte
*/
*(volatile uint8_t*)(&MCF_PSC3_PSCTB_8BIT) = value; // Really 8-bit
}
uint8_t read_pic_byte(void)
{
/*
* Wait until a byte has been received or 1000us are passed
*/
waitfor(1000, pic_rxready);
/*
* Return the received byte
*/
return * (volatile uint8_t *) (&MCF_PSC3_PSCTB_8BIT); // Really 8-bit
}
void pic_init(void)
{
char answer[4] = "OLD";
xprintf("initialize the PIC: ");
/*
* Send the PIC initialization string
*/
write_pic_byte('A');
write_pic_byte('C');
write_pic_byte('P');
write_pic_byte('F');
/*
* Read the 3-char answer string. Should be "OK!".
*/
answer[0] = read_pic_byte();
answer[1] = read_pic_byte();
answer[2] = read_pic_byte();
answer[3] = '\0';
if (answer[0] != 'O' || answer[1] != 'K' || answer[2] != '!')
{
dbg("PIC initialization failed. Already initialized?\r\n");
}
else
{
xprintf("%s\r\n", answer);
}
}
void nvram_init(void)
{
int i;
xprintf("Restore the NVRAM data: ");
/* Request for NVRAM backup data */
write_pic_byte(0x01);
/* Check answer type */
if (read_pic_byte() != 0x81)
{
// FIXME: PIC protocol error
xprintf("FAILED\r\n");
return;
}
/* Restore the NVRAM backup to the FPGA */
for (i = 0; i < 64; i++)
{
uint8_t data = read_pic_byte();
*(volatile uint8_t*)0xffff8961 = i;
*(volatile uint8_t*)0xffff8963 = data;
}
xprintf("finished\r\n");
}
#define KBD_ACIA_CONTROL * ((uint8_t *) 0xfffffc00)
#define MIDI_ACIA_CONTROL * ((uint8_t *) 0xfffffc04)
#define MFP_INTR_IN_SERVICE_A * ((uint8_t *) 0xfffffa0f)
#define MFP_INTR_IN_SERVICE_B * ((uint8_t *) 0xfffffa11)
void acia_init()
{
xprintf("init ACIA: ");
/* init ACIA */
KBD_ACIA_CONTROL = 3; /* master reset */
NOP();
MIDI_ACIA_CONTROL = 3; /* master reset */
NOP();
KBD_ACIA_CONTROL = 0x96; /* clock div = 64, 8N1, RTS low, TX int disable, RX int enable */
NOP();
MFP_INTR_IN_SERVICE_A = 0xff;
NOP();
MFP_INTR_IN_SERVICE_B = 0xff;
NOP();
xprintf("finished\r\n");
}
void enable_coldfire_interrupts()
{
xprintf("enable interrupts: ");
#if defined(MACHINE_FIREBEE)
FBEE_INTR_CONTROL = 0L; /* disable all interrupts */
#endif /* MACHINE_FIREBEE */
MCF_EPORT_EPPAR = 0xaaa8; /* all interrupts on falling edge */
#if defined(MACHINE_FIREBEE)
/*
* TIN0 on the Coldfire is connected to the FPGA. TIN0 triggers every write
* access to 0xff8201 (vbasehi), i.e. everytime the video base address is written
*/
MCF_GPT0_GMS = MCF_GPT_GMS_ICT(1) | /* timer 0 on, video change capture on rising edge */
MCF_GPT_GMS_IEN |
MCF_GPT_GMS_TMS(1); /* route GPT0 interrupt on interrupt controller */
MCF_INTC_ICR62 = MCF_INTC_ICR_IL(7) |
MCF_INTC_ICR_IP(6); /* interrupt level 7, interrupt priority 7 */
MCF_EPORT_EPIER = 0xfe; /* int 1-7 on */
MCF_EPORT_EPFR = 0xff; /* clear all pending interrupts */
MCF_INTC_IMRL = 0xffffff00; /* int 1-7 on */
//MCF_INTC_IMRH = 0xbffffffe; /* psc3 and timer 0 int on */
MCF_INTC_IMRH = 0;
FBEE_INTR_ENABLE = FBEE_INTR_INT_IRQ7 | /* enable pseudo bus error */
FBEE_INTR_INT_MFP_IRQ6 | /* enable MFP interrupts */
FBEE_INTR_INT_FPGA_IRQ5 | /* enable Firebee (PIC, PCI, ETH PHY, DVI, DSP) interrupts */
FBEE_INTR_INT_VSYNC_IRQ4 | /* enable vsync interrupts */
FBEE_INTR_PCI_INTA | /* enable PCI interrupts */
FBEE_INTR_PCI_INTB |
FBEE_INTR_PCI_INTC |
FBEE_INTR_PCI_INTD;
#endif
xprintf("finished\r\n");
}
void disable_coldfire_interrupts()
{
#if defined(MACHINE_FIREBEE)
FBEE_INTR_ENABLE = 0; /* disable all interrupts */
#endif /* MACHINE_FIREBEE */
MCF_EPORT_EPIER = 0x0;
MCF_EPORT_EPFR = 0x0;
MCF_INTC_IMRL = 0xfffffffe;
MCF_INTC_IMRH = 0xffffffff;
}
NIF nif1;
#if defined(MACHINE_M5484LITE)
NIF nif2;
#endif
/*
* initialize the interrupt handler tables to dispatch interrupt requests from Coldfire devices
*/
void init_isr(void)
{
isr_init(); /* need to call that explicitely, otherwise isr table might be full */
/*
* register the FEC interrupt handler
*/
if (!isr_register_handler(64 + INT_SOURCE_FEC0, 7, 6, fec0_interrupt_handler, NULL, (void *) &nif1))
{
err("unable to register isr for FEC0\r\n");
}
/*
* Register the DMA interrupt handler
*/
if (!isr_register_handler(64 + INT_SOURCE_DMA, 7, 7, dma_interrupt_handler, NULL, NULL))
{
err("Error: Unable to register isr for DMA\r\n");
}
#ifdef _NOT_USED_
/*
* register the PIC interrupt handler
*/
if (!isr_register_handler(64 + INT_SOURCE_PSC3, pic_interrupt_handler, NULL, NULL))
{
err("Error: unable to register ISR for PSC3\r\n");
}
/*
* register the XLB PCI interrupt handler
*/
if (!isr_register_handler(64 + INT_SOURCE_XLBPCI, xlbpci_interrupt_handler, NULL, NULL))
{
err("Error: unable to register isr for XLB PCI interrupts\r\n");
}
MCF_INTC_ICR43 = MCF_INTC_ICR_IL(7) | /* level 7, priority 6 */
MCF_INTC_ICR_IP(6);
MCF_INTC_IMRH &= ~MCF_INTC_IMRH_INT_MASK43; /* enable XLB PCI interrupts in DMA controller */
MCF_XLB_XARB_IMR = MCF_XLB_XARB_IMR_SEAE | /* slave error acknowledge interrupt */
MCF_XLB_XARB_IMR_MME | /* multiple master at prio 0 interrupt */
MCF_XLB_XARB_IMR_TTAE | /* TT address only interrupt */
MCF_XLB_XARB_IMR_TTRE | /* TT reserved interrupt enable */
MCF_XLB_XARB_IMR_ECWE | /* external control word interrupt */
MCF_XLB_XARB_IMR_TTME | /* TBST/TSIZ mismatch interrupt */
MCF_XLB_XARB_IMR_BAE; /* bus activity tenure timeout interrupt */
if (!isr_register_handler(64 + INT_SOURCE_PCIARB, pciarb_interrupt_handler, NULL, NULL))
{
err("Error: unable to register isr for PCIARB interrupts\r\n");
return;
}
MCF_INTC_ICR41 = MCF_INTC_ICR_IL(7) | /* level 5, priority 0 */
MCF_INTC_ICR_IP(5);
MCF_INTC_IMRH &= ~MCF_INTC_IMRH_INT_MASK41; /* enable PCIARB interrupts in DMA controller */
MCF_PCIARB_PACR = MCF_PCIARB_PACR_EXTMINTEN(0x1f) | /* external master broken interrupt */
MCF_PCIARB_PACR_INTMINTEN; /* internal master broken interrupt */
#endif /* _NOT_USED_ */
}
void BaS(void)
{
uint8_t *src;
uint8_t *dst = (uint8_t *) TOS;
#if defined(MACHINE_FIREBEE) /* LITE board has no pic and (currently) no nvram */
pic_init();
nvram_init();
#endif /* MACHINE_FIREBEE */
xprintf("initialize MMU: ");
mmu_init();
xprintf("finished\r\n");
xprintf("copy EmuTOS: ");
dma_init();
/* copy EMUTOS */
src = (uint8_t *) EMUTOS;
dma_memcpy(dst, src, EMUTOS_SIZE);
xprintf("finished\r\n");
xprintf("initialize exception vector table: ");
vec_init();
xprintf("finished\r\n");
xprintf("flush caches: ");
flush_and_invalidate_caches();
xprintf("finished\r\n");
xprintf("enable MMU: ");
MCF_MMU_MMUCR = MCF_MMU_MMUCR_EN; /* MMU on */
NOP(); /* force pipeline sync */
xprintf("finished\r\n");
#ifdef MACHINE_FIREBEE
xprintf("IDE reset: ");
/* IDE reset */
* (volatile uint8_t *) (0xffff8802 - 2) = 14;
* (volatile uint8_t *) (0xffff8802 - 0) = 0x80;
wait(1);
* (volatile uint8_t *) (0xffff8802 - 0) = 0;
xprintf("finished\r\n");
xprintf("enable video: ");
/*
* video setup (25MHz)
*/
* (volatile uint32_t *) (0xf0000410 + 0) = 0x032002ba; /* horizontal 640x480 */
* (volatile uint32_t *) (0xf0000410 + 4) = 0x020c020a; /* vertical 640x480 */
* (volatile uint32_t *) (0xf0000410 + 8) = 0x0190015d; /* horizontal 320x240 */
* (volatile uint32_t *) (0xf0000410 + 12) = 0x020C020A; /* vertical 320x230 */
/* fifo on, refresh on, ddrcs and cke on, video dac on */
* (volatile uint32_t *) (0xf0000410 - 0x20) = 0x01070002;
xprintf("finished\r\n");
#endif /* MACHINE_FIREBEE */
sd_card_init();
/*
* memory setup
*/
memset((void *) 0x400, 0, 0x400);
#if defined(MACHINE_FIREBEE)
/* set Falcon bus control register */
/* sets bit 3 and 6. Both are undefined on an original Falcon? */
* (volatile uint8_t *) 0xffff8007 = 0x48;
#endif /* MACHINE_FIREBEE */
/* ST RAM */
* (uint32_t *) 0x42e = STRAM_END; /* phystop TOS system variable */
* (uint32_t *) 0x420 = 0x752019f3; /* memvalid TOS system variable */
* (uint32_t *) 0x43a = 0x237698aa; /* memval2 TOS system variable */
* (uint32_t *) 0x51a = 0x5555aaaa; /* memval3 TOS system variable */
/* TT-RAM */
* (uint32_t *) 0x5a4 = FASTRAM_END; /* ramtop TOS system variable */
* (uint32_t *) 0x5a8 = 0x1357bd13; /* ramvalid TOS system variable */
#if defined(MACHINE_FIREBEE) /* m5484lite has no ACIA and no dip switch... */
acia_init();
#endif /* MACHINE_FIREBEE */
srec_execute("BASFLASH.S19");
/* Jump into the OS */
typedef void void_func(void);
struct rom_header
{
void *initial_sp;
void_func *initial_pc;
};
xprintf("BaS initialization finished, enable interrupts\r\n");
init_isr();
enable_coldfire_interrupts();
init_pci();
// video_init();
/* initialize USB devices */
//init_usb();
set_ipl(7); /* disable interrupts */
xprintf("call EmuTOS\r\n");
struct rom_header *os_header = (struct rom_header *) TOS;
os_header->initial_pc();
}
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