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/*
* MC68360 support routines
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* $Id$
*/
#include <rtems.h>
#include <bsp.h>
#include <m68360.h>
/*
* Send a command to the CPM RISC processer
*/
void M360ExecuteRISC(rtems_unsigned16 command)
{
rtems_unsigned16 sr;
m68k_disable_interrupts (sr);
while (m360.cr & M360_CR_FLG)
continue;
m360.cr = command | M360_CR_FLG;
m68k_enable_interrupts (sr);
}
/*
* Initialize MC68360
*/
void _Init68360 (void)
{
int i;
extern void *_RomBase, *_RamBase;
m68k_isr_entry *vbr;
extern void _CopyDataClearBSSAndStart (void);
/*
* Step 6: Is this a power-up reset?
* For now we just ignore this and do *all* the steps
* Someday we might want to:
* if (Hard, Loss of Clock, Power-up)
* Do all steps
* else if (Double bus fault, watchdog or soft reset)
* Skip to step 12
* else (must be a CPU32+ reset command)
* Skip to step 14
*/
/*
* Step 7: Deal with clock synthesizer
* HARDWARE:
* Change if you're not using an external 25 MHz oscillator.
*/
m360.clkocr = 0x8F; /* No more writes, no clock outputs */
m360.pllcr = 0xD000; /* PLL, no writes, no prescale, */
/* no LPSTOP slowdown, PLL X1 */
m360.cdvcr = 0x8000; /* No more writes, no clock division */
/*
* Step 8: Initialize system protection
* Disable watchdog FIXME: Should use watchdog!!!!
* Watchdog causes system reset
* Fastest watchdog timeout
* Enable double bus fault monitor
* Enable bus monitor external
* 128 clocks for external timeout
*/
m360.sypcr = 0x4F;
/*
* Step 9: Clear parameter RAM and reset communication processor module
*/
for (i = 0 ; i < 192 ; i += sizeof (long)) {
*((long *)((char *)&m360 + 0xC00 + i)) = 0;
*((long *)((char *)&m360 + 0xD00 + i)) = 0;
*((long *)((char *)&m360 + 0xE00 + i)) = 0;
*((long *)((char *)&m360 + 0xF00 + i)) = 0;
}
M360ExecuteRISC (M360_CR_RST);
/*
* Step 10: Write PEPAR
* SINTOUT not used (CPU32+ mode)
* CF1MODE=00 (CONFIG1 input)
* RAS1* double drive
* A31-A28
* OE* output
* CAS2* / CAS3*
* CAS0* / CAS1*
* CS7*
* AVEC*
* HARDWARE:
* Change if you are using a different memory configuration
* (static RAM, external address multiplexing, etc).
*/
m360.pepar = 0x0100;
/*
* Step 11: Remap Chip Select 0 (CS0*), set up GMR
* 1024 addresses per DRAM page (1M DRAM chips)
* 60 nsec DRAM
* 180 nsec ROM (3 wait states)
* HARDWARE:
* Change if you are using a different memory configuration
*/
m360.gmr = M360_GMR_RCNT(24) | M360_GMR_RFEN | M360_GMR_RCYC(0) |
M360_GMR_PGS(3) | M360_GMR_DPS_32BIT | M360_GMR_NCS |
M360_GMR_GAMX;
m360.memc[0].br = (unsigned long)&_RomBase | M360_MEMC_BR_WP |
M360_MEMC_BR_V;
m360.memc[0].or = M360_MEMC_OR_WAITS(3) | M360_MEMC_OR_512KB |
M360_MEMC_OR_8BIT;
/*
* Step 12: Initialize the system RAM
* Set up option/base registers
* 4 MB DRAM
* 60 nsec DRAM
* Wait for chips to power up
* Perform 8 read cycles
* Set all parity bits to correct state
* Enable parity checking
* HARDWARE:
* Change if you are using a different memory configuration
*/
m360.memc[1].or = M360_MEMC_OR_TCYC(0) | M360_MEMC_OR_4MB |
M360_MEMC_OR_DRAM;
m360.memc[1].br = (unsigned long)&_RamBase | M360_MEMC_BR_V;
for (i = 0; i < 50000; i++)
continue;
for (i = 0; i < 8; ++i)
*((volatile unsigned long *)(unsigned long)&_RamBase);
for (i = 0 ; i < 4*1024*1024 ; i += sizeof (unsigned long)) {
volatile unsigned long *lp;
lp = (unsigned long *)((unsigned char *)&_RamBase + i);
*lp = *lp;
}
m360.memc[1].br = (unsigned long)&_RamBase | M360_MEMC_BR_PAREN |
M360_MEMC_BR_V;
/*
* Step 13: Copy the exception vector table to system RAM
*/
m68k_get_vbr (vbr);
for (i = 0; i < 256; ++i)
M68Kvec[i] = vbr[i];
m68k_set_vbr (M68Kvec);
/*
* Step 14: More system initialization
* SDCR (Serial DMA configuratin register)
* Give SDMA priority over all interrupt handlers
* Set DMA arbiration level to 4
* CICR (CPM interrupt configuration register):
* SCC1 requests at SCCa position
* SCC2 requests at SCCb position
* SCC3 requests at SCCc position
* SCC4 requests at SCCd position
* Interrupt request level 4
* Maintain original priority order
* Vector base 128
* SCCs priority grouped at top of table
*/
m360.sdcr = M360_SDMA_SISM_7 | M360_SDMA_SAID_4;
m360.cicr = (3 << 22) | (2 << 20) | (1 << 18) | (0 << 16) |
(4 << 13) | (0x1F << 8) | (128);
/*
* Step 15: Set module configuration register
* Disable timers during FREEZE
* Enable bus monitor during FREEZE
* BCLRO* arbitration level 3
* No show cycles
* User/supervisor access
* Bus clear interupt service level 7
* SIM60 interrupt sources higher priority than CPM
*/
m360.mcr = 0x4C7F;
/*
* Copy data, clear BSS, switch stacks and call main()
*/
_CopyDataClearBSSAndStart ();
}
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