/* this setupcpu function comes from: */ /*==============================================================================*/ /* FILE : start16.asm*/ /**/ /* DESC : A 16 bit mode assembly language startup program, intended for*/ /* use with on Aspen SC520 platforms.*/ /**/ /* 11/16/2000 Added support for the NetSC520*/ /* 12/28/2000 Modified to boot linux image*/ /**/ /* =============================================================================*/ /* */ /* Copyright 2000 Advanced Micro Devices, Inc. */ /* */ /* This software is the property of Advanced Micro Devices, Inc (AMD) which */ /* specifically grants the user the right to modify, use and distribute this */ /* software provided this COPYRIGHT NOTICE is not removed or altered. All */ /* other rights are reserved by AMD. */ /* */ /* THE MATERIALS ARE PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED WARRANTY */ /* OF ANY KIND INCLUDING WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT OF */ /* THIRD-PARTY INTELLECTUAL PROPERTY, OR FITNESS FOR ANY PARTICULAR PURPOSE.*/ /* IN NO EVENT SHALL AMD OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER*/ /* (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS*/ /* INTERRUPTION, LOSS OF INFORMATION) ARISING OUT OF THE USE OF OR INABILITY*/ /* TO USE THE MATERIALS, EVEN IF AMD HAS BEEN ADVISED OF THE POSSIBILITY OF*/ /* SUCH DAMAGES. BECAUSE SOME JURSIDICTIONS PROHIBIT THE EXCLUSION OR*/ /* LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE ABOVE*/ /* LIMITATION MAY NOT APPLY TO YOU.*/ /**/ /* AMD does not assume any responsibility for any errors that may appear in*/ /* the Materials nor any responsibility to support or update the Materials.*/ /* AMD retains the right to make changes to its test specifications at any*/ /* time, without notice.*/ /**/ /* So that all may benefit from your experience, please report any problems */ /* or suggestions about this software back to AMD. Please include your name, */ /* company, telephone number, AMD product requiring support and question or */ /* problem encountered. */ /* */ /* Advanced Micro Devices, Inc. Worldwide support and contact */ /* Embedded Processor Division information available at: */ /* Systems Engineering epd.support@amd.com*/ /* 5204 E. Ben White Blvd. -or-*/ /* Austin, TX 78741 http://www.amd.com/html/support/techsup.html*/ /* ============================================================================*/ #define OUTC(addr, val) *(unsigned char *)(addr) = (val) /* sadly, romcc can't quite handle what we want, so we do this ugly thing */ #define drcctl (( volatile unsigned char *)0xfffef010) #define drcmctl (( volatile unsigned char *)0xfffef012) #define drccfg (( volatile unsigned char *)0xfffef014) #define drcbendadr (( volatile unsigned long *)0xfffef018) #define eccctl (( volatile unsigned char *)0xfffef020) #define dbctl (( volatile unsigned char *)0xfffef040) void setupsc520(void){ volatile unsigned char *cp; volatile unsigned short *sp; volatile unsigned long *edi; volatile unsigned long *par; /* do this to see if MMCR will start acting right. * we suspect you have to do SOMETHING to get things going. * I'm really starting to hate this processor. */ /* no, that did not help. I wonder what will? * outl(0x800df0cb, 0xfffc); */ /* well, this is special! You have to do SHORT writes to the locations, * even though they are CHAR in size and CHAR aligned and technically, a * SHORT write will result in -- yoo ha! -- over writing the next location! * Thanks to the u-boot guys for a reference code I can use. * with these short pointers, it now reliably comes up after power cycle * with printk. Ah yi yi. */ /* turn off the write buffer*/ /* per the note above, make this a short? Let's try it. */ sp = (unsigned short *)0xfffef040; *sp = 0; /* byte writes in AMD assembly */ /* we do short anyway, since u-boot does ... */ /*set the GP CS offset*/ sp = (unsigned short *)0xfffefc08; *sp = 0x00001; /*set the GP CS width*/ sp = (unsigned short *)0xfffefc09; *sp = 0x00003; /* short writes in AMD assembly */ /*set the GP CS width*/ sp = (unsigned short *)0xfffefc0a; *sp = 0x00001; /*set the RD pulse width*/ sp = (unsigned short *)0xfffefc0b; *sp = 0x00003; /*set the GP RD offset */ sp = (unsigned short *)0xfffefc0c; *sp = 0x00001; /*set the GP WR pulse width*/ sp = (unsigned short *)0xfffefc0d; *sp = 0x00003; /*set the GP WR offset*/ sp = (unsigned short *)0xfffefc0e; *sp = 0x00001; /* set up the GP IO pins*/ /*set the GPIO directionreg*/ sp = (unsigned short *)0xfffefc2c; *sp = 0x00000; /*set the GPIO directionreg*/ sp = (unsigned short *)0xfffefc2a; *sp = 0x00000; /*set the GPIO pin function 31-16 reg*/ sp = (unsigned short *)0xfffefc22; *sp = 0x0FFFF; /*set the GPIO pin function 15-0 reg*/ sp = (unsigned short *)0xfffefc20; *sp = 0x0FFFF; /* the 0x80 led should now be working*/ outb(0xaa, 0x80); /* wtf are 680 leds ... */ par = (unsigned long *) 0xfffef0c4; *par = 0x28000680; /* well? */ outb(0x55, 0x80); /*; set the uart baud rate clocks to the normal 1.8432 MHz.*/ cp = (unsigned char *)0xfffefcc0; *cp = 4; /* uart 1 clock source */ cp = (unsigned char *)0xfffefcc4; *cp = 4; /* uart 2 clock source */ /*; set the interrupt mapping registers.*/ cp = (unsigned char *)0x0fffefd20; *cp = 0x01; cp = (unsigned char *)0x0fffefd28; *cp = 0x0c; cp = (unsigned char *)0x0fffefd29; *cp = 0x0b; cp = (unsigned char *)0x0fffefd30; *cp = 0x07; cp = (unsigned char *)0x0fffefd43; *cp = 0x03; cp = (unsigned char *)0x0fffefd51; *cp = 0x02; /*; "enumerate" the PCI. Mainly set the interrupt bits on the PCnetFast. */ outl(0xcf8, 0x08000683c); outl(0xcfc, 0xc); /* set the interrupt line */ /*; Set the SC520 PCI host bridge to target mode to allow external*/ /*; bus mastering events*/ outl(0x0cf8,0x080000004); /*index the status command register on device 0*/ outl(0xcfc, 0x2); /*set the memory access enable bit*/ OUTC(0x0fffef072, 1); /* enable req bits in SYSARBMENB */ /* set up the PAR registers as they are on the MSM586SEG */ par = (unsigned long *) 0xfffef088; *par++ = 0x607c00a0; /*PAR0: PCI:Base 0xa0000; size 0x1f000:*/ *par++ = 0x480400d8; /*PAR1: GP BUS MEM:CS2:Base 0xd8, size 0x4:*/ *par++ = 0x340100ea; /*PAR2: GP BUS IO:CS5:Base 0xea, size 0x1:*/ *par++ = 0x380701f0; /*PAR3: GP BUS IO:CS6:Base 0x1f0, size 0x7:*/ *par++ = 0x3c0003f6; /*PAR4: GP BUS IO:CS7:Base 0x3f6, size 0x0:*/ *par++ = 0x35ff0400; /*PAR5: GP BUS IO:CS5:Base 0x400, size 0xff:*/ *par++ = 0x35ff0600; /*PAR6: GP BUS IO:CS5:Base 0x600, size 0xff:*/ *par++ = 0x35ff0800; /*PAR7: GP BUS IO:CS5:Base 0x800, size 0xff:*/ *par++ = 0x35ff0a00; /*PAR8: GP BUS IO:CS5:Base 0xa00, size 0xff:*/ *par++ = 0x35ff0e00; /*PAR9: GP BUS IO:CS5:Base 0xe00, size 0xff:*/ *par++ = 0x34fb0104; /*PAR10: GP BUS IO:CS5:Base 0x104, size 0xfb:*/ *par++ = 0x35af0200; /*PAR11: GP BUS IO:CS5:Base 0x200, size 0xaf:*/ *par++ = 0x341f03e0; /*PAR12: GP BUS IO:CS5:Base 0x3e0, size 0x1f:*/ *par++ = 0xe41c00c0; /*PAR13: SDRAM:code:cache:nowrite:Base 0xc0000, size 0x7000:*/ *par++ = 0x545c00c8; /*PAR14: GP BUS MEM:CS5:Base 0xc8, size 0x5c:*/ // *par++ = 0x8a020200; /*PAR15: BOOTCS:code:nocache:write:Base 0x2000000, size 0x80000:*/ } /* * * */ #define CACHELINESZ 0x00000010 /* size of our cache line (read buffer)*/ #define COL11_ADR *(unsigned int *)0x0e001e00 /* 11 col addrs*/ #define COL10_ADR *(unsigned int *)0x0e000e00 /* 10 col addrs*/ #define COL09_ADR *(unsigned int *)0x0e000600 /* 9 col addrs*/ #define COL08_ADR *(unsigned int *)0x0e000200 /* 8 col addrs*/ #define ROW14_ADR *(unsigned int *)0x0f000000 /* 14 row addrs*/ #define ROW13_ADR *(unsigned int *)0x07000000 /* 13 row addrs*/ #define ROW12_ADR *(unsigned int *)0x03000000 /* 12 row addrs*/ #define ROW11_ADR *(unsigned int *)0x01000000 /* 11 row addrs/also bank switch*/ #define ROW10_ADR *(unsigned int *)0x00000000 /* 10 row addrs/also bank switch*/ #define COL11_DATA 0x0b0b0b0b /* 11 col addrs*/ #define COL10_DATA 0x0a0a0a0a /* 10 col data*/ #define COL09_DATA 0x09090909 /* 9 col data*/ #define COL08_DATA 0x08080808 /* 8 col data*/ #define ROW14_DATA 0x3f3f3f3f /* 14 row data (MASK)*/ #define ROW13_DATA 0x1f1f1f1f /* 13 row data (MASK)*/ #define ROW12_DATA 0x0f0f0f0f /* 12 row data (MASK)*/ #define ROW11_DATA 0x07070707 /* 11 row data/also bank switch (MASK)*/ #define ROW10_DATA 0xaaaaaaaa /* 10 row data/also bank switch (MASK)*/ void dummy_write(void){ volatile unsigned short *ptr = (volatile unsigned short *)CACHELINESZ; *ptr = 0; } void sc520_udelay(int microseconds) { volatile int x; for(x = 0; x < 1000; x++) ; } static void dumpram(void){ print_err("ctl "); print_err_hex8(*drcctl); print_err("\r\n"); print_err("mctl "); print_err_hex8(*drcmctl); print_err("\r\n"); print_err("cfg "); print_err_hex8(*drccfg); print_err("\r\n"); print_err("bendadr0 "); print_err_hex8(*drcbendadr); print_err("\r\n"); print_err("bendadr1 "); print_err_hex8(*drcbendadr); print_err("\r\n"); print_err("bendadr2 "); print_err_hex8(*drcbendadr); print_err("\r\n"); print_err("bendadr3"); print_err_hex8(*drcbendadr); print_err("\r\n"); } /* there is a lot of silliness in the amd code, and it is * causing romcc real headaches, so we're going to be be a little * less silly. * so, the order of ops is: * for in 3 to 0 * see if bank is there. * if we can write a word, and read it back, to hell with paranoia * the bank is there. So write the magic byte, read it back, and * use that to get size, etc. Try to keep things very simple, * so people can actually follow the damned code. */ /* cache is assumed to be disabled */ int sizemem(void) { int rows,banks, cols, i, bank; unsigned char al; volatile unsigned long *lp = (volatile unsigned long *) CACHELINESZ; unsigned long l; /* initialize dram controller registers */ *dbctl = 0; /* disable write buffer/read-ahead buffer */ *eccctl = 0; *drcmctl = 0x1e; /* Set SDRAM timing for slowest speed. */ /* setup dram register for all banks * with max cols and max banks */ *drccfg=0xbbbb; /* setup loop to do 4 external banks starting with bank 3 */ *drcbendadr=0x0ff000000; /* issue a NOP to all DRAMs */ /* Setup DRAM control register with Disable refresh, * disable write buffer Test Mode and NOP command select */ *drcctl=0x01; /* dummy write for NOP to take effect */ dummy_write(); print_err("NOP\n"); /* 100? 200? */ //sc520_udelay(100); print_err("after sc520_udelay\r\n"); /* issue all banks precharge */ *drcctl=0x02; print_err("set *drcctl to 2 \r\n"); dummy_write(); print_err("PRE\n"); /* issue 2 auto refreshes to all banks */ *drcctl=0x04; dummy_write(); print_err("AUTO1\n"); dummy_write(); print_err("AUTO2\n"); /* issue LOAD MODE REGISTER command */ *drcctl=0x03; dummy_write(); print_err("LOAD MODE REG\n"); *drcctl=0x04; for (i=0; i<8; i++) /* refresh 8 times */{ dummy_write(); print_err("dummy write\r\n"); } print_err("8 dummy writes\n"); /* set control register to NORMAL mode */ *drcctl=0x00; print_err("normal\n"); print_err("HI done normal\r\n"); print_err("sizemem\n"); for(bank = 3; bank >= 0; bank--) { print_err("Try to assign to l\r\n"); *lp = 0xdeadbeef; print_err("assigned l ... \r\n"); if (*lp != 0xdeadbeef) { print_err(" no memory at bank "); // print_err_hex8(bank); // print_err(" value "); print_err_hex32(*lp); print_err("\r\n"); // continue; } l = *drcbendadr; l >>= 8; *drcbendadr = l; print_err("loop around\r\n"); } #if 0 /* enable last bank and setup ending address * register for max ram in last bank */ *drcbendadr=0x0ff000000; // dumpram(); /* issue a NOP to all DRAMs */ /* Setup DRAM control register with Disable refresh, * disable write buffer Test Mode and NOP command select */ *drcctl=0x01; /* dummy write for NOP to take effect */ dummy_write(); print_err("NOP\n"); /* 100? 200? */ //sc520_udelay(100); print_err("after sc520_udelay\r\n"); /* issue all banks precharge */ *drcctl=0x02; print_err("set *drcctl to 2 \r\n"); dummy_write(); print_err("PRE\n"); /* issue 2 auto refreshes to all banks */ *drcctl=0x04; dummy_write(); print_err("AUTO1\n"); dummy_write(); print_err("AUTO2\n"); /* issue LOAD MODE REGISTER command */ *drcctl=0x03; dummy_write(); print_err("LOAD MODE REG\n"); *drcctl=0x04; for (i=0; i<8; i++) /* refresh 8 times */{ dummy_write(); print_err("dummy write\r\n"); } print_err("8 dummy writes\n"); /* set control register to NORMAL mode */ *drcctl=0x00; print_err("normal\n"); print_err("HI done normal\r\n"); bank = 3; /* this is really ugly, it is right from assembly code. * we need to clean it up later */ start: /* write col 11 wrap adr */ COL11_ADR=COL11_DATA; if(COL11_ADR!=COL11_DATA) goto bad_ram; print_err("11\n"); /* write col 10 wrap adr */ COL10_ADR=COL10_DATA; if(COL10_ADR!=COL10_DATA) goto bad_ram; print_err("10\n"); /* write col 9 wrap adr */ COL09_ADR=COL09_DATA; if(COL09_ADR!=COL09_DATA) goto bad_ram; print_err("9\n"); /* write col 8 wrap adr */ COL08_ADR=COL08_DATA; if(COL08_ADR!=COL08_DATA) goto bad_ram; print_err("8\n"); /* write row 14 wrap adr */ ROW14_ADR=ROW14_DATA; if(ROW14_ADR!=ROW14_DATA) goto bad_ram; print_err("14\n"); /* write row 13 wrap adr */ ROW13_ADR=ROW13_DATA; if(ROW13_ADR!=ROW13_DATA) goto bad_ram; print_err("13\n"); /* write row 12 wrap adr */ ROW12_ADR=ROW12_DATA; if(ROW12_ADR!=ROW12_DATA) goto bad_ram; print_err("12\n"); /* write row 11 wrap adr */ ROW11_ADR=ROW11_DATA; if(ROW11_ADR!=ROW11_DATA) goto bad_ram; print_err("11\n"); /* write row 10 wrap adr */ ROW10_ADR=ROW10_DATA; if(ROW10_ADR!=ROW10_DATA) goto bad_ram; print_err("10\n"); /* * read data @ row 12 wrap adr to determine # banks, * and read data @ row 14 wrap adr to determine # rows. * if data @ row 12 wrap adr is not AA, 11 or 12 we have bad RAM. * if data @ row 12 wrap == AA, we only have 2 banks, NOT 4 * if data @ row 12 wrap == 11 or 12, we have 4 banks */ banks=2; if (ROW12_ADR != ROW10_DATA) { banks=4; print_err("4b\n"); if(ROW12_ADR != ROW11_DATA) { if(ROW12_ADR != ROW12_DATA) goto bad_ram; } } /* validate row mask */ rows=ROW14_ADR; if (rowsROW14_DATA) goto bad_ram; /* verify all 4 bytes of dword same */ /* if(rows&0xffff!=(rows>>16)&0xffff) goto bad_ram; if(rows&0xff!=(rows>>8)&0xff) goto bad_ram; */ /* now just get one of them */ rows &= 0xff; print_err("rows"); print_err_hex32(rows); print_err("\n"); /* validate column data */ cols=COL11_ADR; if(colsCOL11_DATA) goto bad_ram; /* verify all 4 bytes of dword same */ /* if(cols&0xffff!=(cols>>16)&0xffff) goto bad_ram; if(cols&0xff!=(cols>>8)&0xff) goto bad_ram; */ print_err("cols"); print_err_hex32(cols); print_err("\n"); cols -= COL08_DATA; /* cols now is in the range of 0 1 2 3 ... */ i = cols&3; // i = cols + rows; /* wacky end addr calculation */ /* al = 3; al -= (i & 0xff);k */ /* what a fookin' mess this is */ if(banks==4) i+=8; /* <-- i holds merged value */ /* i now has the col width in bits 0-1 and the bank count (2 or 4) * in bit 3. * this is the format for the drccfg register */ /* fix ending addr mask*/ /*FIXME*/ /* let's just go with this to start ... see if we can get ANYWHERE */ /* need to get end addr. Need to do it with the bank in mind. */ /* al = 3; al -= i&3; *drcbendaddr = rows >> al; print_err("computed ending_adr = "); print_err_hex8(ending_adr); print_err("\r\n"); */ bad_reinit: /* issue all banks recharge */ *drcctl=0x02; dummy_write(); /* update ending address register */ // *drcbendadr = ending_adr; /* update config register */ *drccfg &= ~(0xff << bank*4); if (ending_adr) *drccfg = ((banks == 4 ? 8 : 0) | cols & 3)<< (bank*4); // dumpram(); /* skip the rest for now */ // bank = 0; // *drccfg=*drccfg&YYY|ZZZZ; if(bank!=0) { bank--; // drcbendaddr--; *drcbendaddr = 0xff000000; //*(&*drcbendadr+XXYYXX)=0xff; goto start; } /* set control register to NORMAL mode */ *drcctl=0x18; dummy_write(); return bank; bad_ram: print_info("bad ram!\r\n"); /* you are here because the read-after-write failed, * in most cases because: no ram in that bank! * set badbank to 1 and go to reinit */ ending_adr = 0; goto bad_reinit; while(1) print_err("DONE NEXTBANK\r\n"); #endif } /* note: based on AMD code, but AMD code is BROKEN AFAIK */ /* this does now work worth shit. */ int staticmem(void){ volatile unsigned char *zero = (unsigned char *) 0; /* set up 0x18 .. **/ *drcbendadr = 0x88; *drcmctl = 0x1e; *drccfg = 0x9; /* nop mode */ *drcctl = 0x1; /* do the dummy write */ *zero = 0; /* precharge */ *drcctl = 2; *zero = 0; /* two autorefreshes */ *drcctl = 4; *zero = 0; print_err("one zero out on refresh\r\n"); *zero = 0; print_err("two zero out on refresh\r\n"); /* load mode register */ *drcctl = 3; *zero = 0; print_err("DONE the load mode reg\r\n"); /* normal mode */ *drcctl = 0x18; *zero = 0; print_err("DONE the normal\r\n"); *zero = 0xdeadbeef; print_err(" zero is now "); print_err_hex32(*zero); print_err("\r\n"); }