From a70483b83bdc733e187ca6955b4edfa02a4d80e0 Mon Sep 17 00:00:00 2001 From: "Ronald G. Minnich" Date: Thu, 2 Oct 2003 22:48:28 +0000 Subject: First SPD code in and working! git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1177 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/northbridge/via/vt8601/northbridge.c | 23 +- src/northbridge/via/vt8601/raminit.c | 429 ++++++++++--------------------- 2 files changed, 155 insertions(+), 297 deletions(-) (limited to 'src/northbridge/via') diff --git a/src/northbridge/via/vt8601/northbridge.c b/src/northbridge/via/vt8601/northbridge.c index 8ad94f01a5..e289a6c9d2 100644 --- a/src/northbridge/via/vt8601/northbridge.c +++ b/src/northbridge/via/vt8601/northbridge.c @@ -13,12 +13,16 @@ #include "chip.h" #include "northbridge.h" +static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x56, 0x57}; + struct mem_range *sizeram(void) { unsigned long mmio_basek; static struct mem_range mem[10]; device_t dev; int i, idx; + unsigned char rambits; dev = dev_find_slot(0, 0); if (!dev) { @@ -33,7 +37,24 @@ struct mem_range *sizeram(void) mem[idx].sizek = 0; idx++; } + for(rambits = 0, i = 0; i < sizeof(ramregs)/sizeof(ramregs[0]); i++) { + unsigned char reg; + reg = pci_read_config8(dev, ramregs[i]); + /* these are ENDING addresses, not sizes. + * if there is memory in this slot, then reg will be > rambits. + * So we just take the max, that gives us total. + * We take the highest one to cover for once and future linuxbios + * bugs. We warn about bugs. + */ + if (reg > rambits) + rambits = reg; + if (reg < rambits) + printk_err("ERROR! register 0x%x is not set!\n", + ramregs[i]); + } + printk_err("I would set ram size to 0x%x Mbytes\n", (1 < #include "raminit.h" -#if 0 + /* This software and ancillary information (herein called SOFTWARE ) called LinuxBIOS is made available under the terms described @@ -32,278 +32,12 @@ it with the version available from LANL. * (Rest of configuration is done in C) * 5/19/03 by SONE Takeshi */ +/* converted to C 9/2003 Ron Minnich */ - -/* Stable ~1 usec delay by hitting unused ISA port. */ -#define UDELAY(x) movl $x,%ecx; 9: outb %al,$0x81; loop 9b - -#define DIMMS_READ(x) \ - movl 0x00000000+x, %eax; \ - movl 0x10000000+x, %eax; \ - movl 0x20000000+x, %eax; \ - movl 0x30000000+x, %eax; \ - movl 0x40000000+x, %eax; \ - movl 0x50000000+x, %eax - -#define DIMMS_WRITE(x) \ - movl %eax, 0x00000000+x; \ - movl %eax, 0x10000000+x; \ - movl %eax, 0x20000000+x; \ - movl %eax, 0x30000000+x; \ - movl %eax, 0x40000000+x; \ - movl %eax, 0x50000000+x - -raminit: - intel_chip_post_macro(0x35) - - // memory clk enable. We are not using ECC - CS_WRITE($0x78, $0x01) - // dram control, see the book. -#if DIMM_PC133 - CS_WRITE($0x68, $0x52) -#else - CS_WRITE($0x68, $0x42) -#endif - // dram control, see the book. - CS_WRITE($0x6B, $0x0c) - // Initial setting, 256MB in each bank, will be rewritten later. - CS_WRITE($0x5A, $0x20) - CS_WRITE($0x5B, $0x40) - CS_WRITE($0x5C, $0x60) - CS_WRITE($0x5D, $0x80) - CS_WRITE($0x5E, $0xA0) - CS_WRITE($0x5F, $0xC0) - // It seems we have to take care of these 2 registers as if - // they are bank 6 and 7. - CS_WRITE($0x56, $0xC0) - CS_WRITE($0x57, $0xC0) - - // SDRAM in all banks - CS_WRITE($0x60, $0x3F) - // DRAM timing. I'm suspicious of this - // This is for all banks, 64 is 0,1. 65 is 2,3. 66 is 4,5. - // ras precharge 4T, RAS pulse 5T - // cas2 is 0xd6, cas3 is 0xe6 - // we're also backing off write pulse width to 2T, so result is 0xee -#if DIMM_CL2 - CS_WRITE($0x64, $0xd4) - CS_WRITE($0x65, $0xd4) - CS_WRITE($0x66, $0xd4) -#else // CL=3 - CS_WRITE($0x64, $0xe4) - CS_WRITE($0x65, $0xe4) - CS_WRITE($0x66, $0xe4) -#endif - - // dram frequency select. - // enable 4K pages for 64M dram. -#if DIMM_PC133 - CS_WRITE($0x69, $0x3c) -#else - CS_WRITE($0x69, $0xac) -#endif - // refresh counter, disabled. - CS_WRITE($0x6A, $0x00) - // clkenable configuration. kevinh FIXME - add precharge - CS_WRITE($0x6C, $0x00) - // dram read latch delay of 1 ns, MD drive 8 mA, - // high drive strength on MA[2: 13], we#, cas#, ras# - // As per Cindy Lee, set to 0x37, not 0x57 - CS_WRITE($0x6D, $0x7f) - - /* Initialize all banks at once */ - -/* begin to initialize*/ - // I forget why we need this, but we do - mov $0xa55a5aa5, %eax - DIMMS_WRITE(0) - -/* set NOP*/ - CS_WRITE($0x6C, $0x01) - -/* wait 200us*/ - // You need to do the memory reference. That causes the nop cycle. - DIMMS_READ(0) - UDELAY(400) - -/* set precharge */ - CS_WRITE($0x6C, $0x02) - -/* dummy reads*/ - DIMMS_READ(0) - UDELAY(200) - -/* set CBR*/ - CS_WRITE($0x6C, $0x04) - -/* do 8 reads and wait >100us between each - from via*/ - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - DIMMS_READ(0) - UDELAY(200) - -/* set MRS*/ - CS_WRITE($0x6c, $0x03) -#if DIMM_CL2 - DIMMS_READ(0x150) -#else // CL=3 - DIMMS_READ(0x1d0) -#endif - UDELAY(200) - -/* set to normal mode */ - CS_WRITE($0x6C, $0x08) - movl $0x55aa55aa, %eax - DIMMS_WRITE(0) - DIMMS_READ(0) - UDELAY(200) - - // Set the refresh rate. -#if DIMM_PC133 - CS_WRITE($0x6A, $0x86) -#else - CS_WRITE($0x6A, $0x65) -#endif - // enable multi-page open - CS_WRITE($0x6B, $0x0d) - - /* Begin auto-detection - * Find the first bank with DIMM equipped. */ - - /* Maximum possible memory in bank 0, none in other banks. - * Starting from bank 0, we's fill 0 in these registers - * until memory is found. */ - CS_WRITE($0x5A, $0xff) - CS_WRITE($0x5B, $0xff) - CS_WRITE($0x5C, $0xff) - CS_WRITE($0x5D, $0xff) - CS_WRITE($0x5E, $0xff) - CS_WRITE($0x5F, $0xff) - CS_WRITE($0x56, $0xff) - CS_WRITE($0x57, $0xff) - - movl $0x5A, %ebx // first bank -1: - /* Write different values to 0 and 8, then read from 0. - * If values of address 0 match, we have something there. */ - movl $0x12345678, %eax - movl %eax, 0 - movl $0x87654321, %edx - movl %edx, 8 - movl 0, %edx - cmpl %eax, %edx - je 2f - /* No memory in this bank. Tell it to the bridge. */ - movl %ebx, %eax - xorl %edx, %edx - PCI_WRITE_CONFIG_BYTE - incl %ebx - cmpl $0x60, %ebx - jne 1b - /* No memory at all! */ - CONSOLE_EMERG_TX_STRING($msg_nomem) -1: - hlt - jmp 1b -2: - - /* Detect MA mapping type of the first bank. */ - - jmp raminit_ma -raminit_ma_reg_table: - /* Values for MA type register to try */ - .word 0x0000, 0x8088, 0xe0ee - .word 0xffff // end mark - -raminit_ma: - xorl %esi, %esi // highest address - movl $raminit_ma_reg_table, %ebx -1: - movw (%ebx), %cx - cmpw $0xffff, %cx - je raminit_ma_done - movl $0x58, %eax - PCI_WRITE_CONFIG_WORD - - xorl %eax, %eax - movl %eax, (%eax) - - // Write to addresses with only one address bit on, - // from 0x80000000 to 0x00000008 (lower 3 bits are ignored, assuming - // 64-bit bus). - // Then what is read at address 0 is the value written to the lowest - // address where it gets wrap-around. That address is either the size - // of the bank, or a missing bit due to incorrect MA mapping. - movl $0x80000000, %eax -2: - movl %eax, (%eax) - shrl $1, %eax - cmpl $4, %eax - jne 2b - - movl 0, %eax - cmpl %eax, %esi - jnc 3f - - // This is the current best MA mapping. - // Save the address and its MA mapping value. - movl %eax, %esi - movl %ecx, %edi -3: - incl %ebx - incl %ebx - jmp 1b - - -raminit_ma_done: - // Set the best (hopefully correct) MA mapping type. - movl $0x58, %eax - movl %edi, %ecx - PCI_WRITE_CONFIG_WORD - - CONSOLE_DEBUG_TX_STRING($msg_enabled) - CONSOLE_DEBUG_TX_HEX32(%esi) - CONSOLE_DEBUG_TX_STRING($msg_bytes) - - /* - * We have the size of first bank in %esi, but throwing it away. - * Sizing will again be done in C, because we'll configure the rest - * of banks in there anyway. - */ - - //CALLSP(dumpnorth) - - intel_chip_post_macro(0x36) - - - .section ".rom.data" -msg_nomem: - .asciz "No memory\r\n" -msg_enabled: - .asciz "Enabled first bank of RAM: 0x" -msg_bytes: - .asciz " bytes\r\n" - .previous -#endif - - /* this is an early hack. We're going to just try to get memory - * working as it was before. I need help for SPD! RGM - */ -// Set to 1 if your DIMMs are PC133 -// Note that I'm assuming CPU's FSB frequency is 133MHz. If your CPU runs -// at another bus speed, you might need to change some of register values. +/* Set to 1 if your DIMMs are PC133 Note that I'm assuming CPU's FSB + * frequency is 133MHz. If your CPU runs at another bus speed, you + * might need to change some of register values. + */ #ifndef DIMM_PC133 #define DIMM_PC133 0 #endif @@ -313,19 +47,19 @@ msg_bytes: #define DIMM_CL2 0 #endif - void dimms_read(unsigned long x) { - uint8_t c; - unsigned long eax; - volatile unsigned long y; - eax = x; - for(c = 0; c < 6; c++) { - - print_err("dimms_read: "); - print_err_hex32(eax); - print_err("\r\n"); - y = * (volatile unsigned long *) eax; - eax += 0x10000000; - } +void dimms_read(unsigned long x) { + uint8_t c; + unsigned long eax; + volatile unsigned long y; + eax = x; + for(c = 0; c < 6; c++) { + + print_err("dimms_read: "); + print_err_hex32(eax); + print_err("\r\n"); + y = * (volatile unsigned long *) eax; + eax += 0x10000000; + } } void dimms_write(int x) { @@ -340,8 +74,9 @@ void dimms_write(int x) { } } -#define setnorthb pci_write_config8 -#if 0 + + +#ifdef DEBUG_SETNORTHB void setnorthb(device_t north, uint8_t reg, uint8_t val) { print_err("setnorth: reg "); print_err_hex8(reg); @@ -350,6 +85,8 @@ void setnorthb(device_t north, uint8_t reg, uint8_t val) { print_err("\r\n"); pci_write_config8(north, reg, val); } +#else +#define setnorthb pci_write_config8 #endif void @@ -371,10 +108,10 @@ static void sdram_set_registers(const struct mem_controller *ctrl) { 0x0000, 0x8088, 0xe0ee, 0xffff // end mark }; - static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + static const unsigned char ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x56, 0x57}; - device_t north = 0; + device_t north = (device_t) 0; uint8_t c, r; print_err("vt8601 init starting\n"); @@ -386,7 +123,10 @@ static void sdram_set_registers(const struct mem_controller *ctrl) { print_err(" "); print_err_hex16(pci_read_config16(north, 2)); print_err("\r\n"); - + + /* All we are doing now is setting initial known-good values that will + * be revised later as we read SPD + */ // memory clk enable. We are not using ECC pci_write_config8(north,0x78, 0x01); print_err_hex8(pci_read_config8(north, 0x78)); @@ -435,8 +175,12 @@ static void sdram_set_registers(const struct mem_controller *ctrl) { #else pci_write_config8(north,0x69, 0xac); #endif + + /* IMPORTANT -- disable refresh counter */ // refresh counter, disabled. pci_write_config8(north,0x6A, 0x00); + + // clkenable configuration. kevinh FIXME - add precharge pci_write_config8(north,0x6C, 0x00); // dram read latch delay of 1 ns, MD drive 8 mA, @@ -446,6 +190,75 @@ static void sdram_set_registers(const struct mem_controller *ctrl) { /* Initialize all banks at once */ +} + +/* slot is the dram slot. Base is the *8M base. */ +static unsigned char +do_module_size(unsigned char slot) { /*, unsigned char base) */ + static const unsigned char log2[256] = {[1] = 0, [2] = 1, [4] = 2, [8] = 3, + [16]=4, [32]=5, [64]=6, + [128]=7}; + static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x56, 0x57}; + device_t north = 0; + /* for all the DRAMS, see if they are there and get the size of each + * module. This is just a very early first cut at sizing. + */ + /* we may run out of registers ... */ + unsigned char width, banks, rows, cols, reg; + unsigned char value = 0; + unsigned char module = 0xa1 | (slot << 1); + /* is the module there? if byte 2 is not 4, then we'll assume it + * is useless. + */ + if (smbus_read_byte(module, 2) != 4) + goto done; + + //print_err_hex8(slot); + // print_err(" is SDRAM\n"); + width = smbus_read_byte(module, 6) | (smbus_read_byte(module,7)<<0); + banks = smbus_read_byte(module, 17); + /* we're going to assume symmetric banks. Sorry. */ + cols = smbus_read_byte(module, 4) & 0xf; + rows = smbus_read_byte(module, 3) & 0xf; + /* grand total. You have rows+cols addressing, * times of banks, times + * width of data in bytes*/ + /* do this in terms of address bits. Then subtract 23 from it. + * That might do it. + */ + value = cols + rows + log2[banks] + log2[width]; + value -= 23; + /* now subtract 3 more bits as these are 8-bit bytes */ + value -= 3; + // print_err_hex8(value); + // print_err(" is the # bits for this bank\n"); + /* now put that size into the correct register */ + value = (1 << value); + done: + reg = ramregs[slot]; + + // print_err_hex8(value); print_err(" would go into "); + // print_err_hex8(ramregs[reg]); print_err("\n"); + // pci_write_config8(north, ramregs[reg], value); + return value; +} + +static void sdram_set_spd_registers(const struct mem_controller *ctrl) { + +} + +static void sdram_enable(int controllers, const struct mem_controller *ctrl) { + unsigned char i; + static const uint16_t raminit_ma_reg_table[] = { + /* Values for MA type register to try */ + 0x0000, 0x8088, 0xe0ee, + 0xffff // end mark + }; + static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x56, 0x57}; + + device_t north = 0; + uint8_t c, r, base; /* begin to initialize*/ // I forget why we need this, but we do dimms_write(0xa55a5aa5); @@ -599,13 +412,37 @@ static void sdram_set_registers(const struct mem_controller *ctrl) { print_err("\r\n"); } } + base = 0; + /* runs out of variable space. */ + /* this is unrolled and constants used as much as possible to help + * us not run out of registers. + * we'll run out of code space instead :-) + */ + // for(i = 0; i < 8; i++) + base = do_module_size(0); /*, base);*/ + pci_write_config8(north, ramregs[0], base); + base = do_module_size(1); /*, base);*/ + base += pci_read_config8(north, ramregs[0]); + pci_write_config8(north, ramregs[1], base); + /* runs out of code space. */ + for(i = 0; i < 8; i++){ + pci_write_config8(north, ramregs[i], base); + /* + pci_write_config8(north, ramregs[3], base); + pci_write_config8(north, ramregs[4], base); + pci_write_config8(north, ramregs[5], base); + pci_write_config8(north, ramregs[6], base); + pci_write_config8(north, ramregs[7], base); + */ + } + /* + base = do_module_size(0xa0, base); + base = do_module_size(0xa0, base); + base = do_module_size(0xa0, base); + base = do_module_size(0xa0, base); + base = do_module_size(0xa0, base); + base = do_module_size(0xa0, base);*/ print_err("vt8601 done\n"); dumpnorth(north); udelay(1000); } - -static void sdram_set_spd_registers(const struct mem_controller *ctrl) { -} - -static void sdram_enable(int controllers, const struct mem_controller *ctrl) { -} -- cgit v1.2.3