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coreboot-libre-fam15h-rdimm/util/romcc/tests/raminit_test1.c

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Initial commit
2024-03-04 11:14:53 +01:00
#define HAVE_STRING_SUPPORT 0
#define HAVE_CAST_SUPPORT 1
#define HAVE_STATIC_ARRAY_SUPPORT 1
#define HAVE_POINTER_SUPPORT 1
#define HAVE_MACRO_ARG_SUPPORT 0
void outb(unsigned char value, unsigned short port)
{
__builtin_outb(value, port);
}
void outw(unsigned short value, unsigned short port)
{
__builtin_outw(value, port);
}
void outl(unsigned int value, unsigned short port)
{
__builtin_outl(value, port);
}
unsigned char inb(unsigned short port)
{
return __builtin_inb(port);
}
unsigned char inw(unsigned short port)
{
return __builtin_inw(port);
}
unsigned char inl(unsigned short port)
{
return __builtin_inl(port);
}
static unsigned int config_cmd(unsigned char bus, unsigned devfn, unsigned where)
{
return 0x80000000 | (bus << 16) | (devfn << 8) | (where & ~3);
}
static unsigned char pcibios_read_config_byte(
unsigned char bus, unsigned devfn, unsigned where)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
return inb(0xCFC + (where & 3));
}
static unsigned short pcibios_read_config_word(
unsigned char bus, unsigned devfn, unsigned where)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
return inw(0xCFC + (where & 2));
}
static unsigned int pcibios_read_config_dword(
unsigned char bus, unsigned devfn, unsigned where)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
return inl(0xCFC);
}
static void pcibios_write_config_byte(
unsigned char bus, unsigned devfn, unsigned where, unsigned char value)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
outb(value, 0xCFC + (where & 3));
}
static void pcibios_write_config_word(
unsigned char bus, unsigned devfn, unsigned where, unsigned short value)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
outw(value, 0xCFC + (where & 2));
}
static void pcibios_write_config_dword(
unsigned char bus, unsigned devfn, unsigned where, unsigned int value)
{
outl(config_cmd(bus, devfn, where), 0xCF8);
outl(value, 0xCFC);
}
/* Base Address */
#ifndef CONFIG_TTYS0_BASE
#define CONFIG_TTYS0_BASE 0x3f8
#endif
#ifndef CONFIG_TTYS0_BAUD
#define CONFIG_TTYS0_BAUD 115200
#endif
#if ((115200%CONFIG_TTYS0_BAUD) != 0)
#error Bad ttys0 baud rate
#endif
#define CONFIG_TTYS0_DIV (115200/CONFIG_TTYS0_BAUD)
/* Line Control Settings */
#ifndef CONFIG_TTYS0_LCS
/* Set 8bit, 1 stop bit, no parity */
#define CONFIG_TTYS0_LCS 0x3
#endif
#define UART_LCS CONFIG_TTYS0_LCS
/* Data */
#define UART_RBR 0x00
#define UART_TBR 0x00
/* Control */
#define UART_IER 0x01
#define UART_IIR 0x02
#define UART_FCR 0x02
#define UART_LCR 0x03
#define UART_MCR 0x04
#define UART_DLL 0x00
#define UART_DLM 0x01
/* Status */
#define UART_LSR 0x05
#define UART_MSR 0x06
#define UART_SCR 0x07
int uart_can_tx_byte(void)
{
return inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x20;
}
void uart_wait_to_tx_byte(void)
{
while(!uart_can_tx_byte())
;
}
void uart_wait_until_sent(void)
{
while(!(inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x40))
;
}
void uart_tx_byte(unsigned char data)
{
uart_wait_to_tx_byte();
outb(data, CONFIG_TTYS0_BASE + UART_TBR);
/* Make certain the data clears the fifos */
uart_wait_until_sent();
}
void uart_init(void)
{
/* disable interrupts */
outb(0x0, CONFIG_TTYS0_BASE + UART_IER);
/* enable fifo's */
outb(0x01, CONFIG_TTYS0_BASE + UART_FCR);
/* Set Baud Rate Divisor to 12 ==> 115200 Baud */
outb(0x80 | UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
outb(CONFIG_TTYS0_DIV & 0xFF, CONFIG_TTYS0_BASE + UART_DLL);
outb((CONFIG_TTYS0_DIV >> 8) & 0xFF, CONFIG_TTYS0_BASE + UART_DLM);
outb(UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
}
void __console_tx_char(unsigned char byte)
{
uart_tx_byte(byte);
}
void __console_tx_nibble(unsigned nibble)
{
unsigned char digit;
digit = nibble + '0';
if (digit > '9') {
digit += 39;
}
__console_tx_char(digit);
}
void __console_tx_hex8(unsigned char byte)
{
__console_tx_nibble(byte >> 4);
__console_tx_nibble(byte & 0x0f);
}
void __console_tx_hex32(unsigned char value)
{
__console_tx_nibble((value >> 28) & 0x0f);
__console_tx_nibble((value >> 24) & 0x0f);
__console_tx_nibble((value >> 20) & 0x0f);
__console_tx_nibble((value >> 16) & 0x0f);
__console_tx_nibble((value >> 12) & 0x0f);
__console_tx_nibble((value >> 8) & 0x0f);
__console_tx_nibble((value >> 4) & 0x0f);
__console_tx_nibble(value & 0x0f);
}
#if HAVE_STRING_SUPPORT
void __console_tx_string(char *str)
{
unsigned char ch;
while((ch = *str++) != '\0') {
__console_tx_char(ch);
}
}
#else
void __console_tx_string(char *str)
{
}
#endif
void print_emerg_char(unsigned char byte) { __console_tx_char(byte); }
void print_emerg_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_emerg_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_emerg(char *str) { __console_tx_string(str); }
void print_alert_char(unsigned char byte) { __console_tx_char(byte); }
void print_alert_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_alert_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_alert(char *str) { __console_tx_string(str); }
void print_crit_char(unsigned char byte) { __console_tx_char(byte); }
void print_crit_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_crit_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_crit(char *str) { __console_tx_string(str); }
void print_err_char(unsigned char byte) { __console_tx_char(byte); }
void print_err_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_err_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_err(char *str) { __console_tx_string(str); }
void print_warning_char(unsigned char byte) { __console_tx_char(byte); }
void print_warning_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_warning_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_warning(char *str) { __console_tx_string(str); }
void print_notice_char(unsigned char byte) { __console_tx_char(byte); }
void print_notice_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_notice_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_notice(char *str) { __console_tx_string(str); }
void print_info_char(unsigned char byte) { __console_tx_char(byte); }
void print_info_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_info_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_info(char *str) { __console_tx_string(str); }
void print_debug_char(unsigned char byte) { __console_tx_char(byte); }
void print_debug_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_debug_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_debug(char *str) { __console_tx_string(str); }
void print_spew_char(unsigned char byte) { __console_tx_char(byte); }
void print_spew_hex8(unsigned char value) { __console_tx_hex8(value); }
void print_spew_hex32(unsigned int value) { __console_tx_hex32(value); }
void print_spew(char *str) { __console_tx_string(str); }
#define PIIX4_DEVFN 0x90
#define SMBUS_MEM_DEVICE_START 0x50
#define SMBUS_MEM_DEVICE_END 0x53
#define SMBUS_MEM_DEVICE_INC 1
#define PM_BUS 0
#define PM_DEVFN (PIIX4_DEVFN+3)
#define SMBUS_IO_BASE 0x1000
#define SMBHSTSTAT 0
#define SMBHSTCTL 2
#define SMBHSTCMD 3
#define SMBHSTADD 4
#define SMBHSTDAT0 5
#define SMBHSTDAT1 6
#define SMBBLKDAT 7
void smbus_enable(void)
{
/* iobase addr */
pcibios_write_config_dword(PM_BUS, PM_DEVFN, 0x90, SMBUS_IO_BASE | 1);
/* smbus enable */
pcibios_write_config_byte(PM_BUS, PM_DEVFN, 0xd2, (0x4 << 1) | 1);
/* iospace enable */
pcibios_write_config_word(PM_BUS, PM_DEVFN, 0x4, 1);
}
void smbus_setup(void)
{
outb(0, SMBUS_IO_BASE + SMBHSTSTAT);
}
static void smbus_wait_until_ready(void)
{
while((inb(SMBUS_IO_BASE + SMBHSTSTAT) & 1) == 1) {
/* nop */
}
}
static void smbus_wait_until_done(void)
{
unsigned char byte;
do {
byte = inb(SMBUS_IO_BASE + SMBHSTSTAT);
}while((byte &1) == 1);
while( (byte & ~1) == 0) {
byte = inb(SMBUS_IO_BASE + SMBHSTSTAT);
}
}
int smbus_read_byte(unsigned device, unsigned address)
{
unsigned char host_status_register;
unsigned char byte;
int result;
smbus_wait_until_ready();
/* setup transaction */
/* disable interrupts */
outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL);
/* set the device I'm talking to */
outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBHSTADD);
/* set the command/address... */
outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
/* set up for a byte data read */
outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xE3) | (0x2 << 2), SMBUS_IO_BASE + SMBHSTCTL);
/* clear any lingering errors, so the transaction will run */
outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
/* clear the data byte...*/
outb(0, SMBUS_IO_BASE + SMBHSTDAT0);
/* start the command */
outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL);
/* poll for transaction completion */
smbus_wait_until_done();
host_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT);
/* read results of transaction */
byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
result = byte;
if (host_status_register != 0x02) {
result = -1;
}
return result;
}
#define I440GX_BUS 0
#define I440GX_DEVFN ((0x00 << 3) + 0)
#define USE_ECC 0
#define CAS_LATENCY 3
/* CAS latency 2 */
#if (CAS_LATENCY == 2)
#define CAS_NB 0x17
/*
* 7 == 0111
* 1 == 0001
*/
#define CAS_MODE 0x2a
/*
* a == 1010
* 2 == 0010
*/
#endif
/* CAS latency 3 */
#if (CAS_LATENCY == 3)
#define CAS_NB 0x13
/*
* 3 == 0011
* 1 == 0001
*/
#define CAS_MODE 0x3a
/*
* a == 1010
* 3 == 0011
*/
#endif
#ifndef CAS_NB
#error "Nothing defined"
#endif
/* Default values for config registers */
static void set_nbxcfg(void)
{
/* NBXCFG 0x50 - 0x53 */
/* f == 1111
* 0 == 0000
* 0 == 0000
* 0 == 0000
* 0 == 0000
* 1 == 0001
* 8 == 1000
* c == 1100
* SDRAM Row without ECC:
* row 0 == 1 No ECC
* row 1 == 1 No ECC
* row 2 == 1 No ECC
* row 3 == 1 No ECC
* row 4 == 1 No ECC
* row 5 == 1 No ECC
* row 6 == 1 No ECC
* row 7 == 1 No ECC
* Host Bus Fast Data Ready Enable == 0 Disabled
* IDSEL_REDIRECT == 0 (430TX compatibility disable?)
* WSC# Hanshake Disable == 0 enable (Use External IOAPIC)
* Host/DRAM Frequence == 00 100Mhz
* AGP to PCI Access Enable == 0 Disable
* PCI Agent to Aperture Access Disable == 0 Enable (Ignored)
* Aperture Access Global Enable == 0 Disable
* DRAM Data Integrity Mode == 11 (Error Checking/Correction)
* ECC Diagnostic Mode Enable == 0 Not Enabled
* MDA present == 0 Not Present
* USWC Write Post During During I/O Bridge Access Enable == 1 Enabled
* In Order Queue Depth (IQD) (RO) == ??
*/
pcibios_write_config_dword(I440GX_BUS, I440GX_DEVFN, 0x50, 0xff00000c);
}
static void set_dramc(void)
{
/* 0 == 0000
* 8 == 1000
* Not registered SDRAM
* refresh disabled
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x57, 0x8);
}
static void set_pam(void)
{
/* PAM - Programmable Attribute Map Registers */
/* Ideally we want to enable all of these as DRAM and teach
* linux it is o.k. to use them...
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x59, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x5a, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x5b, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x5d, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x5e, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x5f, 0x00);
}
static void set_drb(void)
{
/* DRB - DRAM Row Boundary Registers */
/* Conservative setting 8MB of ram on first DIMM... */
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x60, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x61, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x62, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x63, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x64, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x65, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x66, 0x01);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x67, 0x01);
}
static void set_fdhc(void)
{
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x68, 0x00);
}
static void set_mbsc(void)
{
/* MBSC - Memory Buffer Strength Control */
/* 00c00003e820
* [47:44] 0 == 0000
* [43:40] 0 == 0000
* [39:36] c == 1100
* [35:32] 0 == 0000
* [31:28] 0 == 0000
* [27:24] 0 == 0000
* [23:20] 0 == 0000
* [19:16] 3 == 0011
* [15:12] e == 1110
* [11: 8] 8 == 1000
* [ 7: 4] 2 == 0010
* [ 3: 0] 0 == 0000
* MAA[14:0]#, WEA#, SRASA#, SCASA# Buffer Strengths == 3x
* MAB[14,13,10,12:11,9:0]#, WEB#, SRASB#, SCASB# Buffer Strengths == 3x
* MD[63:0]# Buffer Strength Control 2 == 3x
* MD[63:0]# Buffer Strength Control 1 == 3x
* MECC[7:0] Buffer Strength Control 2 == 3x
* MECC[7:0] Buffer Strength Control 1 == 3x
* CSB7# Buffer Strength == 3x
* CSA7# Buffer Strength == 3x
* CSB6# Buffer Strength == 3x
* CSA6# Buffer Strength == 3x
* CSA5#/CSB5# Buffer Strength == 2x
* CSA4#/CSB4# Buffer Strength == 2x
* CSA3#/CSB3# Buffer Strength == 2x
* CSA2#/CSB2# Buffer Strength == 2x
* CSA1#/CSB1# Buffer Strength == 2x
* CSA0#/CSB0# Buffer Strength == 2x
* DQMA5 Buffer Strength == 2x
* DQMA1 Buffer Strength == 3x
* DQMB5 Buffer Strength == 2x
* DQMB1 Buffer Strength == 2x
* DQMA[7:6,4:2,0] Buffer Strength == 3x
* GCKE Buffer Strength == 1x
* FENA Buffer Strength == 3x
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x69, 0xB3);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x6a, 0xee);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x6b, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x6c, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x6d, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x6e, 0x03);
}
static void set_smram(void)
{
/* 0x72 SMRAM */
/* 1 == 0001
* a == 1010
* SMM Compatible base segment == 010 (Hardcoded value)
*/
}
static void set_esramc(void)
{
/* 0x73 ESMRAMC */
}
static void set_rps(void)
{
/* RPS - Row Page Size Register */
/* 0x0055
* [15:12] 0 == 0000
* [11: 8] 0 == 0000
* [ 7: 4] 5 == 0101
* [ 3: 0] 5 == 0101
* DRB[0] == 4KB
* DRB[1] == 4KB
* DRB[2] == 4KB
* DRB[3] == 4KB
* DRB[4] == 2KB
* DRB[5] == 2KB
* DRB[6] == 2KB
* DRB[7] == 2KB
*/
pcibios_write_config_word(I440GX_BUS, I440GX_DEVFN, 0x74, 0x5555);
}
static void set_sdramc(void)
{
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76, CAS_NB);
}
static void set_pgpol(void)
{
/* PGPOL - Paging Policy Register */
/* 0xff07
* [15:12] f == 1111
* [11: 8] f == 1111
* [ 7: 4] 0 == 0000
* [ 3: 0] 7 == 0111
* row0 == 4banks
* row1 == 4banks
* row2 == 4banks
* row3 == 4banks
* row4 == 4banks
* row5 == 4banks
* row6 == 4banks
* row7 == 4banks
* Dram Idle Timer (DIT) == 32 clocks
*/
pcibios_write_config_word(I440GX_BUS, I440GX_DEVFN, 0x78, 0xff07);
}
static void set_mbfs(void)
{
/* MBFS - Memory Buffer Frequencey Select Register */
/* 0xffff7f
* [23:20] f == 1111
* [19:16] f == 1111
* [15:12] f == 1111
* [11: 8] f == 1111
* [ 7: 4] 7 == 0111
* [ 3: 0] f == 1111
* MAA[14:0], WEA#, SRASA#, SCASA# == 100Mhz Buffers Enabled
* MAB[14,13,10,12:11,9:0], WEB#, SRASB#, SCASB# == 100Mhz Buffers Enabled
* MD[63:0] Control 2 == 100 Mhz Buffer Enable
* MD[63:0] Control 1 == 100 Mhz B
* MECC[7:0] Control 2 == 100 Mhz B
*
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xca, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xcb, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xcc, 0x7f);
}
static void set_dwtc(void)
{
/* DWTC - DRAM Write Thermal Throttle Control */
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe0, 0xb4);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe1, 0xbe);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe2, 0xff);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe3, 0xd7);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe4, 0x97);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe5, 0x3e);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe6, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe7, 0x80);
}
static void set_drtc(void)
{
/* DRTC - DRAM Read Thermal Throttle Control */
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe8, 0x2c);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xe9, 0xd3);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xea, 0xf7);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xeb, 0xcf);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xec, 0x9d);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xed, 0x3e);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xee, 0x00);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xef, 0x00);
}
static void set_pmcr(void)
{
/* PMCR -- BIOS sets 0x90 into it.
* 0x10 is REQUIRED.
* we have never used it. So why did this ever work?
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x7a, 0x90);
}
void sdram_set_registers(void)
{
set_nbxcfg();
set_dramc();
set_pam();
set_drb();
set_fdhc();
set_mbsc();
set_smram();
set_esramc();
set_rps();
set_sdramc();
set_pgpol();
set_mbfs();
set_dwtc();
set_drtc();
set_pmcr();
}
int log2(int value)
{
/* __builtin_bsr is a exactly equivalent to the x86 machine
* instruction with the exception that it returns -1
* when the value presented to it is zero.
* Otherwise __builtin_bsr returns the zero based index of
* the highest bit set.
*/
return __builtin_bsr(value);
}
static void spd_set_drb(void)
{
/*
* Effects: Uses serial presence detect to set the
* DRB registers which holds the ending memory address assigned
* to each DIMM.
*/
unsigned end_of_memory;
unsigned device;
unsigned drb_reg;
end_of_memory = 0; /* in multiples of 8MiB */
device = SMBUS_MEM_DEVICE_START;
drb_reg = 0x60;
while (device <= SMBUS_MEM_DEVICE_END) {
unsigned side1_bits, side2_bits;
int byte, byte2;
side1_bits = side2_bits = -1;
/* rows */
byte = smbus_read_byte(device, 3);
if (byte >= 0) {
side1_bits += byte & 0xf;
/* columns */
byte = smbus_read_byte(device, 4);
side1_bits += byte & 0xf;
/* banks */
byte = smbus_read_byte(device, 17);
side1_bits += log2(byte);
/* Get the moduel data width and convert it to a power of two */
/* low byte */
byte = smbus_read_byte(device, 6);
/* high byte */
byte2 = smbus_read_byte(device, 7);
#if HAVE_CAST_SUPPORT
side1_bits += log2((((unsigned long)byte2 << 8)| byte));
#else
side1_bits += log2((byte2 << 8) | byte);
#endif
/* now I have the ram size in bits as a power of two (less 1) */
/* Make it mulitples of 8MB */
side1_bits -= 25;
/* side two */
/* number of physical banks */
byte = smbus_read_byte(device, 5);
if (byte > 1) {
/* for now only handle the symmetrical case */
side2_bits = side1_bits;
}
}
/* Compute the end address for the DRB register */
/* Only process dimms < 2GB (2^8 * 8MB) */
if (side1_bits < 8) {
end_of_memory += (1 << side1_bits);
}
#if HAVE_STRING_SUPPORT
print_debug("end_of_memory: "); print_debug_hex32(end_of_memory); print_debug("\n");
#endif
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, drb_reg, end_of_memory);
if (side2_bits < 8 ) {
end_of_memory += (1 << side2_bits);
}
#if HAVE_STRING_SUPPORT
print_debug("end_of_memory: "); print_debug_hex32(end_of_memory); print_debug("\n");
#endif
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, drb_reg +1, end_of_memory);
drb_reg += 2;
device += SMBUS_MEM_DEVICE_INC;
}
}
void sdram_no_memory(void)
{
#if HAVE_STRING_SUPPORT
print_err("No memory!!\n");
#endif
while(1) ;
}
static void spd_set_dramc(void)
{
/*
* Effects: Uses serial presence detect to set the
* DRAMC register, which records if ram is registered or not,
* and controls the refresh rate.
* The refresh rate is not set here, as memory refresh
* cannot be enbaled until after memory is initialized.
* see spd_enable_refresh.
*/
/* auto detect if ram is registered or not. */
/* The DRAMC register also contorls the refresh rate but we can't
* set that here because we must leave refresh disabled.
* see: spd_enable_refresh
*/
/* Find the first dimm and assume the rest are the same */
/* FIXME Check for illegal/unsupported ram configurations and abort */
unsigned device;
int byte;
unsigned dramc;
byte = -1;
device = SMBUS_MEM_DEVICE_START;
while ((byte < 0) && (device <= SMBUS_MEM_DEVICE_END)) {
byte = smbus_read_byte(device, 21);
device += SMBUS_MEM_DEVICE_INC;
}
if (byte < 0) {
/* We couldn't find anything we must have no memory */
sdram_no_memory();
}
dramc = 0x8;
if ((byte & 0x12) != 0) {
/* this is a registered part.
* observation: for register parts, BIOS zeros (!)
* registers CA-CC. This has an undocumented meaning.
*/
/* But it does make sense the oppisite of registered
* sdram is buffered and 0xca - 0xcc control the buffers.
* Clearing them aparently disables them.
*/
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xca, 0);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xcb, 0);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0xcc, 0);
dramc = 0x10;
}
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x57, dramc);
}
static void spd_enable_refresh(void)
{
/*
* Effects: Uses serial presence detect to set the
* refresh rate in the DRAMC register.
* see spd_set_dramc for the other values.
* FIXME: Check for illegal/unsupported ram configurations and abort
*/
#if HAVE_STATIC_ARRAY_SUPPORT
static const unsigned char refresh_rates[] = {
0x01, /* Normal 15.625 us -> 15.6 us */
0x05, /* Reduced(.25X) 3.9 us -> 7.8 us */
0x05, /* Reduced(.5X) 7.8 us -> 7.8 us */
0x02, /* Extended(2x) 31.3 us -> 31.2 us */
0x03, /* Extended(4x) 62.5 us -> 62.4 us */
0x04, /* Extended(8x) 125 us -> 124.8 us */
};
#endif
/* Find the first dimm and assume the rest are the same */
int status;
int byte;
unsigned device;
unsigned refresh_rate;
byte = -1;
status = -1;
device = SMBUS_MEM_DEVICE_START;
while ((byte < 0) && (device <= SMBUS_MEM_DEVICE_END)) {
byte = smbus_read_byte(device, 12);
device += SMBUS_MEM_DEVICE_INC;
}
if (byte < 0) {
/* We couldn't find anything we must have no memory */
sdram_no_memory();
}
byte &= 0x7f;
/* Default refresh rate be conservative */
refresh_rate = 5;
/* see if the ram refresh is a supported one */
if (byte < 6) {
#if HAVE_STATIC_ARRAY_SUPPORT
refresh_rate = refresh_rates[byte];
#endif
}
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x57);
byte &= 0xf8;
byte |= refresh_rate;
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x57, byte);
}
static void spd_set_sdramc(void)
{
return;
}
static void spd_set_rps(void)
{
/*
* Effects: Uses serial presence detect to set the row size
* on a given DIMM
* FIXME: Check for illegal/unsupported ram configurations and abort
*/
/* The RPS register holds the size of a ``page'' of DRAM on each DIMM */
unsigned page_sizes;
unsigned index;
unsigned device;
unsigned char dramc;
/* default all page sizes to 2KB */
page_sizes = 0;
index = 0;
device = SMBUS_MEM_DEVICE_START;
for(; device <= SMBUS_MEM_DEVICE_END; index += 4, device += SMBUS_MEM_DEVICE_INC) {
unsigned int status;
unsigned int byte;
int page_size;
byte = smbus_read_byte(device, 3);
if (byte < 0) continue;
/* I now have the row page size as a power of 2 */
page_size = byte & 0xf;
/* make it in multiples of 2Kb */
page_size -= 11;
if (page_size <= 0) continue;
/* FIXME: do something with page sizes greather than 8KB!! */
page_sizes |= (page_size << index);
/* side two */
byte = smbus_read_byte(device, 5);
if (byte <= 1) continue;
/* For now only handle the symmetrical case */
page_sizes |= (page_size << (index +2));
}
/* next block is for Ron's attempt to get registered to work. */
/* we have just verified that we have to have this code. It appears that
* the registered SDRAMs do indeed set the RPS wrong. sheesh.
*/
/* at this point, page_sizes holds the RPS for all ram.
* we have verified that for registered DRAM the values are
* 1/2 the size they should be. So we test for registered
* and then double the sizes if needed.
*/
dramc = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x57);
if (dramc & 0x10) {
/* registered */
/* BIOS makes weird page size for registered! */
/* what we have found is you need to set the EVEN banks to
* twice the size. Fortunately there is a very easy way to
* do this. First, read the WORD value of register 0x74.
*/
page_sizes += 0x1111;
}
pcibios_write_config_word(I440GX_BUS, I440GX_DEVFN, 0x74, page_sizes);
}
static void spd_set_pgpol(void)
{
/*
* Effects: Uses serial presence detect to set the number of banks
* on a given DIMM
* FIXME: Check for illegal/unsupported ram configurations and abort
*/
/* The PGPOL register stores the number of logical banks per DIMM,
* and number of clocks the DRAM controller waits in the idle
* state.
*/
unsigned device;
unsigned bank_sizes;
unsigned bank;
unsigned reg;
/* default all bank counts 2 */
bank_sizes = 0;
bank = 0;
device = SMBUS_MEM_DEVICE_START;
for(; device <= SMBUS_MEM_DEVICE_END;
bank += 2, device += SMBUS_MEM_DEVICE_INC) {
int byte;
/* logical banks */
byte = smbus_read_byte(device, 17);
if (byte < 0) continue;
if (byte < 4) continue;
bank_sizes |= (1 << bank);
/* side 2 */
/* Number of physical banks */
byte = smbus_read_byte(device, 5);
if (byte <= 1) continue;
/* for now only handle the symmetrical case */
bank_sizes |= (1 << (bank +1));
}
reg = bank_sizes << 8;
reg |= 0x7; /* 32 clocks idle time */
pcibios_write_config_word(I440GX_BUS, I440GX_DEVFN, 0x78, reg);
}
static void spd_set_nbxcfg(void)
{
/*
* Effects: Uses serial presence detect to set the
* ECC support flags in the NBXCFG register
* FIXME: Check for illegal/unsupported ram configurations and abort
*/
unsigned reg;
unsigned index;
unsigned device;
/* Say all dimms have no ECC support */
reg = 0xff;
index = 0;
device = SMBUS_MEM_DEVICE_START;
for(; device <= SMBUS_MEM_DEVICE_END; index += 2, device += SMBUS_MEM_DEVICE_INC) {
int byte;
byte = smbus_read_byte(device, 11);
if (byte < 0) continue;
#if !USE_ECC
byte = 0; /* Disable ECC */
#endif
/* 0 == None, 1 == Parity, 2 == ECC */
if (byte != 2) continue;
reg ^= (1 << index);
/* side two */
/* number of physical banks */
byte = smbus_read_byte(device, 5);
if (byte <= 1) continue;
/* There is only the symmetrical case */
reg ^= (1 << (index +1));
}
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x53, reg);
/* Now see if reg is 0xff. If it is we are done. If not,
* we need to set 0x18 into register 0x50.l
* we will do this in two steps, first or in 0x80 to 0x50.b,
* then or in 0x1 to 0x51.b
*/
#if HAVE_STRING_SUPPORT
print_debug("spd_set_nbxcfg reg="); print_debug_hex8(reg); print_debug("\n");
#endif
if (reg != 0xff) {
unsigned char byte;
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x50);
byte |= 0x80;
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x50, byte);
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x51);
byte |= 1;
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x51, byte);
/* try this.
* We should be setting bit 2 in register 76 and we're not
* technically we should see if CL=2 for the ram,
* but registered is so screwed up that it's kind of a lost
* cause.
*/
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76);
byte |= 4;
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76, byte);
#if HAVE_STRING_SUPPORT
print_debug("spd_set_nbxcfg 0x76.b="); print_debug_hex8(byte); print_debug("\n");
#endif
}
}
void sdram_set_spd_registers(void)
{
spd_set_drb();
spd_set_dramc();
spd_set_rps();
spd_set_sdramc();
spd_set_pgpol();
spd_set_nbxcfg();
}
void sdram_first_normal_reference(void)
{
return;
}
void sdram_special_finishup(void)
{
return;
}
static void set_ram_command(unsigned command)
{
unsigned char byte;
command &= 0x7;
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76);
byte &= 0x1f;
byte |= (command << 5);
pcibios_write_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76, byte);
#if HAVE_STRING_SUPPORT
print_debug("set_ram_command 0x76.b="); print_debug_hex8(byte); print_debug("\n");
#endif
}
#define RAM_COMMAND_NONE 0x0
#define RAM_COMMAND_NOOP 0x1
#define RAM_COMMAND_PRECHARGE 0x2
#define RAM_COMMAND_MRS 0x3
#define RAM_COMMAND_CBR 0x4
void sdram_set_command_none(void)
{
set_ram_command(RAM_COMMAND_NONE);
}
void sdram_set_command_noop(void)
{
set_ram_command(RAM_COMMAND_NOOP);
}
void sdram_set_command_precharge(void)
{
set_ram_command(RAM_COMMAND_PRECHARGE);
}
static unsigned long dimm_base(int n)
{
unsigned char byte;
unsigned long result;
if (n == 0) {
return 0;
}
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x60 + (n - 1));
result = byte;
result <<= 23;
return result;
}
static void dimms_read(unsigned long offset)
{
int i;
for(i = 0; i < 8; i++) {
unsigned long dummy;
unsigned long addr;
unsigned long next_base;
next_base = dimm_base(i +1);
addr = dimm_base(i);
if (addr == next_base) {
continue;
}
addr += offset;
#if HAVE_STRING_SUPPORT
print_debug("Reading ");
print_debug_hex32(addr);
print_debug("\n");
#endif
#if HAVE_POINTER_SUPPORT
#if HAVE_MACRO_ARG_SUPPORT
dummy = RAM(unsigned long, addr);
#else
dummy = *((volatile unsigned long *)(addr));
#endif
#endif
#if HAVE_STRING_SUPPORT
print_debug("Reading ");
print_debug_hex32(addr ^ 0xddf8);
print_debug("\n");
#endif
#if HAVE_POINTER_SUPPORT
#if HAVE_MACRO_ARG_SUPPORT
dummy = RAM(unsigned long, addr ^ 0xdff8);
#else
dummy = *((volatile unsigned long *)(addr ^ 0xdff8));
#endif
#endif
#if HAVE_STRING_SUPPORT
print_debug("Read ");
print_debug_hex32(addr);
print_debug_hex32(addr ^ 0xddf8);
print_debug("\n");
#endif
}
}
void sdram_set_command_cbr(void)
{
set_ram_command(RAM_COMMAND_CBR);
}
void sdram_assert_command(void)
{
dimms_read(0x400);
}
void sdram_set_mode_register(void)
{
unsigned char byte;
unsigned cas_mode;
set_ram_command(RAM_COMMAND_MRS);
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x76);
cas_mode = byte & 0x4;
cas_mode ^= 4;
cas_mode <<= 2;
cas_mode |= 0x2a;
cas_mode <<= 3;
dimms_read(cas_mode);
}
void sdram_enable_refresh(void)
{
spd_enable_refresh();
}
unsigned long sdram_get_ecc_size_bytes(void)
{
unsigned char byte;
unsigned long size;
/* FIXME handle the no ram case. */
/* Read the RAM SIZE */
byte = pcibios_read_config_byte(I440GX_BUS, I440GX_DEVFN, 0x67);
/* Convert it to bytes */
size = byte;
size <<= 23;
#if !USE_ECC
size = 0;
#endif
return size;
}
/* Dummy udelay code acting as a place holder... */
void udelay(int count)
{
int i;
i = 5;
}
void sdram_enable(void)
{
#if HAVE_STRING_SUPPORT
print_debug("Ram Enable 1\n");
#endif
/* noop command */
sdram_set_command_noop();
udelay(200);
sdram_assert_command();
/* Precharge all */
sdram_set_command_precharge();
sdram_assert_command();
/* wait until the all banks idle state... */
#if HAVE_STRING_SUPPORT
print_debug("Ram Enable 2\n");
#endif
/* Now we need 8 AUTO REFRESH / CBR cycles to be performed */
sdram_set_command_cbr();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
sdram_assert_command();
#if HAVE_STRING_SUPPORT
print_debug("Ram Enable 3\n");
#endif
/* mode register set */
sdram_set_mode_register();
/* MAx[14:0] lines,
* MAx[2:0 ] 010 == burst mode of 4
* MAx[3:3 ] 1 == interleave wrap type
* MAx[4:4 ] == CAS# latency bit
* MAx[6:5 ] == 01
* MAx[12:7] == 0
*/
#if HAVE_STRING_SUPPORT
print_debug("Ram Enable 4\n");
#endif
/* normal operation */
sdram_set_command_none();
#if HAVE_STRING_SUPPORT
print_debug("Ram Enable 5\n");
#endif
}
/* Setup SDRAM */
void sdram_initialize(void)
{
#if HAVE_STRING_SUPPORT
print_debug("Ram1\n");
#endif
/* Set the registers we can set once to reasonable values */
sdram_set_registers();
#if HAVE_STRING_SUPPORT
print_debug("Ram2\n");
#endif
/* Now setup those things we can auto detect */
sdram_set_spd_registers();
#if HAVE_STRING_SUPPORT
print_debug("Ram3\n");
#endif
/* Now that everything is setup enable the SDRAM.
* Some chipsets do the work for use while on others
* we need to it by hand.
*/
sdram_enable();
#if HAVE_STRING_SUPPORT
print_debug("Ram4\n");
#endif
sdram_first_normal_reference();
#if HAVE_STRING_SUPPORT
print_debug("Ram5\n");
#endif
sdram_enable_refresh();
sdram_special_finishup();
#if HAVE_STRING_SUPPORT
print_debug("Ram6\n");
#endif
}