spd_sdram.c

linux下的BOOT程序原码,有需要的可以来下,保证好用

	uchar data[2];

	if (i2c_read(SPD_EEPROM_ADDRESS, addr, 1, data, 1) == 0)
		return (int)data[0];
	else
		return 0;
}

#else /* CONFIG_440 */

/*-----------------------------------------------------------------------------
  |  Memory Controller Options 0
  +-----------------------------------------------------------------------------*/
#define SDRAM_CFG0_DCEN		0x80000000	/* SDRAM Controller Enable	*/
#define SDRAM_CFG0_MCHK_MASK	0x30000000	/* Memory data errchecking mask */
#define SDRAM_CFG0_MCHK_NON	0x00000000	/* No ECC generation		*/
#define SDRAM_CFG0_MCHK_GEN	0x20000000	/* ECC generation		*/
#define SDRAM_CFG0_MCHK_CHK	0x30000000	/* ECC generation and checking	*/
#define SDRAM_CFG0_RDEN		0x08000000	/* Registered DIMM enable	*/
#define SDRAM_CFG0_PMUD		0x04000000	/* Page management unit		*/
#define SDRAM_CFG0_DMWD_MASK	0x02000000	/* DRAM width mask		*/
#define SDRAM_CFG0_DMWD_32	0x00000000	/* 32 bits			*/
#define SDRAM_CFG0_DMWD_64	0x02000000	/* 64 bits			*/
#define SDRAM_CFG0_UIOS_MASK	0x00C00000	/* Unused IO State		*/
#define SDRAM_CFG0_PDP		0x00200000	/* Page deallocation policy	*/

/*-----------------------------------------------------------------------------
  |  Memory Controller Options 1
  +-----------------------------------------------------------------------------*/
#define SDRAM_CFG1_SRE		0x80000000	/* Self-Refresh Entry		*/
#define SDRAM_CFG1_PMEN		0x40000000	/* Power Management Enable	*/

/*-----------------------------------------------------------------------------+
  |  SDRAM DEVPOT Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_DEVOPT_DLL	0x80000000
#define SDRAM_DEVOPT_DS		0x40000000

/*-----------------------------------------------------------------------------+
  |  SDRAM MCSTS Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_MCSTS_MRSC	0x80000000
#define SDRAM_MCSTS_SRMS	0x40000000
#define SDRAM_MCSTS_CIS		0x20000000

/*-----------------------------------------------------------------------------
  |  SDRAM Refresh Timer Register
  +-----------------------------------------------------------------------------*/
#define SDRAM_RTR_RINT_MASK	  0xFFFF0000
#define SDRAM_RTR_RINT_ENCODE(n)  (((n) << 16) & SDRAM_RTR_RINT_MASK)
#define sdram_HZ_to_ns(hertz)	  (1000000000/(hertz))

/*-----------------------------------------------------------------------------+
  |  SDRAM UABus Base Address Reg
  +-----------------------------------------------------------------------------*/
#define SDRAM_UABBA_UBBA_MASK	0x0000000F

/*-----------------------------------------------------------------------------+
  |  Memory Bank 0-7 configuration
  +-----------------------------------------------------------------------------*/
#define SDRAM_BXCR_SDBA_MASK	0xff800000	  /* Base address	      */
#define SDRAM_BXCR_SDSZ_MASK	0x000e0000	  /* Size		      */
#define SDRAM_BXCR_SDSZ_8	0x00020000	  /*   8M		      */
#define SDRAM_BXCR_SDSZ_16	0x00040000	  /*  16M		      */
#define SDRAM_BXCR_SDSZ_32	0x00060000	  /*  32M		      */
#define SDRAM_BXCR_SDSZ_64	0x00080000	  /*  64M		      */
#define SDRAM_BXCR_SDSZ_128	0x000a0000	  /* 128M		      */
#define SDRAM_BXCR_SDSZ_256	0x000c0000	  /* 256M		      */
#define SDRAM_BXCR_SDSZ_512	0x000e0000	  /* 512M		      */
#define SDRAM_BXCR_SDAM_MASK	0x0000e000	  /* Addressing mode	      */
#define SDRAM_BXCR_SDAM_1	0x00000000	  /*   Mode 1		      */
#define SDRAM_BXCR_SDAM_2	0x00002000	  /*   Mode 2		      */
#define SDRAM_BXCR_SDAM_3	0x00004000	  /*   Mode 3		      */
#define SDRAM_BXCR_SDAM_4	0x00006000	  /*   Mode 4		      */
#define SDRAM_BXCR_SDBE		0x00000001	  /* Memory Bank Enable	      */

/*-----------------------------------------------------------------------------+
  |  SDRAM TR0 Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_TR0_SDWR_MASK	0x80000000
#define	 SDRAM_TR0_SDWR_2_CLK	0x00000000
#define	 SDRAM_TR0_SDWR_3_CLK	0x80000000
#define SDRAM_TR0_SDWD_MASK	0x40000000
#define	 SDRAM_TR0_SDWD_0_CLK	0x00000000
#define	 SDRAM_TR0_SDWD_1_CLK	0x40000000
#define SDRAM_TR0_SDCL_MASK	0x01800000
#define	 SDRAM_TR0_SDCL_2_0_CLK 0x00800000
#define	 SDRAM_TR0_SDCL_2_5_CLK 0x01000000
#define	 SDRAM_TR0_SDCL_3_0_CLK 0x01800000
#define SDRAM_TR0_SDPA_MASK	0x000C0000
#define	 SDRAM_TR0_SDPA_2_CLK	0x00040000
#define	 SDRAM_TR0_SDPA_3_CLK	0x00080000
#define	 SDRAM_TR0_SDPA_4_CLK	0x000C0000
#define SDRAM_TR0_SDCP_MASK	0x00030000
#define	 SDRAM_TR0_SDCP_2_CLK	0x00000000
#define	 SDRAM_TR0_SDCP_3_CLK	0x00010000
#define	 SDRAM_TR0_SDCP_4_CLK	0x00020000
#define	 SDRAM_TR0_SDCP_5_CLK	0x00030000
#define SDRAM_TR0_SDLD_MASK	0x0000C000
#define	 SDRAM_TR0_SDLD_1_CLK	0x00000000
#define	 SDRAM_TR0_SDLD_2_CLK	0x00004000
#define SDRAM_TR0_SDRA_MASK	0x0000001C
#define	 SDRAM_TR0_SDRA_6_CLK	0x00000000
#define	 SDRAM_TR0_SDRA_7_CLK	0x00000004
#define	 SDRAM_TR0_SDRA_8_CLK	0x00000008
#define	 SDRAM_TR0_SDRA_9_CLK	0x0000000C
#define	 SDRAM_TR0_SDRA_10_CLK	0x00000010
#define	 SDRAM_TR0_SDRA_11_CLK	0x00000014
#define	 SDRAM_TR0_SDRA_12_CLK	0x00000018
#define	 SDRAM_TR0_SDRA_13_CLK	0x0000001C
#define SDRAM_TR0_SDRD_MASK	0x00000003
#define	 SDRAM_TR0_SDRD_2_CLK	0x00000001
#define	 SDRAM_TR0_SDRD_3_CLK	0x00000002
#define	 SDRAM_TR0_SDRD_4_CLK	0x00000003

/*-----------------------------------------------------------------------------+
  |  SDRAM TR1 Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_TR1_RDSS_MASK	0xC0000000
#define	 SDRAM_TR1_RDSS_TR0	0x00000000
#define	 SDRAM_TR1_RDSS_TR1	0x40000000
#define	 SDRAM_TR1_RDSS_TR2	0x80000000
#define	 SDRAM_TR1_RDSS_TR3	0xC0000000
#define SDRAM_TR1_RDSL_MASK	0x00C00000
#define	 SDRAM_TR1_RDSL_STAGE1	0x00000000
#define	 SDRAM_TR1_RDSL_STAGE2	0x00400000
#define	 SDRAM_TR1_RDSL_STAGE3	0x00800000
#define SDRAM_TR1_RDCD_MASK	0x00000800
#define	 SDRAM_TR1_RDCD_RCD_0_0 0x00000000
#define	 SDRAM_TR1_RDCD_RCD_1_2 0x00000800
#define SDRAM_TR1_RDCT_MASK	0x000001FF
#define	 SDRAM_TR1_RDCT_ENCODE(x)  (((x) << 0) & SDRAM_TR1_RDCT_MASK)
#define	 SDRAM_TR1_RDCT_DECODE(x)  (((x) & SDRAM_TR1_RDCT_MASK) >> 0)
#define	 SDRAM_TR1_RDCT_MIN	0x00000000
#define	 SDRAM_TR1_RDCT_MAX	0x000001FF

/*-----------------------------------------------------------------------------+
  |  SDRAM WDDCTR Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_WDDCTR_WRCP_MASK	0xC0000000
#define	 SDRAM_WDDCTR_WRCP_0DEG	  0x00000000
#define	 SDRAM_WDDCTR_WRCP_90DEG  0x40000000
#define	 SDRAM_WDDCTR_WRCP_180DEG 0x80000000
#define SDRAM_WDDCTR_DCD_MASK	0x000001FF

/*-----------------------------------------------------------------------------+
  |  SDRAM CLKTR Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_CLKTR_CLKP_MASK	0xC0000000
#define	 SDRAM_CLKTR_CLKP_0DEG	  0x00000000
#define	 SDRAM_CLKTR_CLKP_90DEG	  0x40000000
#define	 SDRAM_CLKTR_CLKP_180DEG  0x80000000
#define SDRAM_CLKTR_DCDT_MASK	0x000001FF

/*-----------------------------------------------------------------------------+
  |  SDRAM DLYCAL Options
  +-----------------------------------------------------------------------------*/
#define SDRAM_DLYCAL_DLCV_MASK	0x000003FC
#define	 SDRAM_DLYCAL_DLCV_ENCODE(x) (((x)<<2) & SDRAM_DLYCAL_DLCV_MASK)
#define	 SDRAM_DLYCAL_DLCV_DECODE(x) (((x) & SDRAM_DLYCAL_DLCV_MASK)>>2)

/*-----------------------------------------------------------------------------+
  |  General Definition
  +-----------------------------------------------------------------------------*/
#define DEFAULT_SPD_ADDR1	0x53
#define DEFAULT_SPD_ADDR2	0x52
#define MAXBANKS		4		/* at most 4 dimm banks */
#define MAX_SPD_BYTES		256
#define NUMHALFCYCLES		4
#define NUMMEMTESTS		8
#define NUMMEMWORDS		8
#define MAXBXCR			4
#define TRUE			1
#define FALSE			0

const unsigned long test[NUMMEMTESTS][NUMMEMWORDS] = {
	{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
	 0xFFFFFFFF, 0xFFFFFFFF},
	{0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
	 0x00000000, 0x00000000},
	{0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
	 0x55555555, 0x55555555},
	{0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
	 0xAAAAAAAA, 0xAAAAAAAA},
	{0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
	 0x5A5A5A5A, 0x5A5A5A5A},
	{0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
	 0xA5A5A5A5, 0xA5A5A5A5},
	{0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
	 0x55AA55AA, 0x55AA55AA},
	{0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
	 0xAA55AA55, 0xAA55AA55}
};

/* bank_parms is used to sort the bank sizes by descending order */
struct bank_param {
	unsigned long cr;
	unsigned long bank_size_bytes;
};

typedef struct bank_param BANKPARMS;

#ifdef CFG_SIMULATE_SPD_EEPROM
extern unsigned char cfg_simulate_spd_eeprom[128];
#endif

unsigned char spd_read(uchar chip, uint addr);

void get_spd_info(unsigned long* dimm_populated,
		  unsigned char* iic0_dimm_addr,
		  unsigned long	 num_dimm_banks);

void check_mem_type
(unsigned long* dimm_populated,
 unsigned char* iic0_dimm_addr,
 unsigned long	num_dimm_banks);

void check_volt_type
(unsigned long* dimm_populated,
 unsigned char* iic0_dimm_addr,
 unsigned long	num_dimm_banks);

void program_cfg0(unsigned long* dimm_populated,
		  unsigned char* iic0_dimm_addr,
		  unsigned long	 num_dimm_banks);

void program_cfg1(unsigned long* dimm_populated,
		  unsigned char* iic0_dimm_addr,
		  unsigned long	 num_dimm_banks);

void program_rtr (unsigned long* dimm_populated,
		  unsigned char* iic0_dimm_addr,
		  unsigned long	 num_dimm_banks);

void program_tr0 (unsigned long* dimm_populated,
		  unsigned char* iic0_dimm_addr,
		  unsigned long	 num_dimm_banks);

void program_tr1 (void);

void program_ecc (unsigned long	 num_bytes);

unsigned
long  program_bxcr(unsigned long* dimm_populated,
		   unsigned char* iic0_dimm_addr,
		   unsigned long  num_dimm_banks);

/*
 * This function is reading data from the DIMM module EEPROM over the SPD bus
 * and uses that to program the sdram controller.
 *
 * This works on boards that has the same schematics that the AMCC walnut has.
 *
 * BUG: Don't handle ECC memory
 * BUG: A few values in the TR register is currently hardcoded
 */

long int spd_sdram(void) {
	unsigned char iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
	unsigned long dimm_populated[sizeof(iic0_dimm_addr)];
	unsigned long total_size;
	unsigned long cfg0;
	unsigned long mcsts;
	unsigned long num_dimm_banks;		    /* on board dimm banks */

	num_dimm_banks = sizeof(iic0_dimm_addr);

	/*
	 * Make sure I2C controller is initialized
	 * before continuing.
	 */
	i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);

	/*
	 * Read the SPD information using I2C interface. Check to see if the
	 * DIMM slots are populated.
	 */
	get_spd_info(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * Check the memory type for the dimms plugged.
	 */
	check_mem_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * Check the voltage type for the dimms plugged.
	 */
	check_volt_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);

#if defined(CONFIG_440GX)
	/*
	 * Soft-reset SDRAM controller.
	 */
	mtsdr(sdr_srst, SDR0_SRST_DMC);
	mtsdr(sdr_srst, 0x00000000);
#endif

	/*
	 * program 440GP SDRAM controller options (SDRAM0_CFG0)
	 */
	program_cfg0(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * program 440GP SDRAM controller options (SDRAM0_CFG1)
	 */
	program_cfg1(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * program SDRAM refresh register (SDRAM0_RTR)
	 */
	program_rtr(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * program SDRAM Timing Register 0 (SDRAM0_TR0)
	 */
	program_tr0(dimm_populated, iic0_dimm_addr, num_dimm_banks);

	/*
	 * program the BxCR registers to find out total sdram installed
	 */
	total_size = program_bxcr(dimm_populated, iic0_dimm_addr,
				  num_dimm_banks);

	/*
	 * program SDRAM Clock Timing Register (SDRAM0_CLKTR)
	 */
	mtsdram(mem_clktr, 0x40000000);

	/*
	 * delay to ensure 200 usec has elapsed
	 */
	udelay(400);

	/*
	 * enable the memory controller
	 */
	mfsdram(mem_cfg0, cfg0);
	mtsdram(mem_cfg0, cfg0 | SDRAM_CFG0_DCEN);

	/*
	 * wait for SDRAM_CFG0_DC_EN to complete
	 */
	while (1) {
		mfsdram(mem_mcsts, mcsts);
		if ((mcsts & SDRAM_MCSTS_MRSC) != 0) {
			break;
		}
	}

	/*
	 * program SDRAM Timing Register 1, adding some delays
	 */
	program_tr1();

	/*
	 * if ECC is enabled, initialize parity bits
	 */

	return total_size;
}

unsigned char spd_read(uchar chip, uint addr)
{
	unsigned char data[2];

#ifdef CFG_SIMULATE_SPD_EEPROM
	if (chip == CFG_SIMULATE_SPD_EEPROM) {
		/*
		 * Onboard spd eeprom requested -> simulate values
		 */
		return cfg_simulate_spd_eeprom[addr];
	}
#endif /* CFG_SIMULATE_SPD_EEPROM */

	if (i2c_probe(chip) == 0) {
		if (i2c_read(chip, addr, 1, data, 1) == 0) {
			return data[0];
		}
	}

	return 0;
}

void get_spd_info(unsigned long*   dimm_populated,
		  unsigned char*   iic0_dimm_addr,
		  unsigned long	   num_dimm_banks)
{
	unsigned long dimm_num;
	unsigned long dimm_found;
	unsigned char num_of_bytes;
	unsigned char total_size;

	dimm_found = FALSE;
	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
		num_of_bytes = 0;
		total_size = 0;

		num_of_bytes = spd_read(iic0_dimm_addr[dimm_num], 0);
		total_size = spd_read(iic0_dimm_addr[dimm_num], 1);

		if ((num_of_bytes != 0) && (total_size != 0)) {
			dimm_populated[dimm_num] = TRUE;
			dimm_found = TRUE;
#if 0
			printf("DIMM slot %lu: populated\n", dimm_num);
#endif
		} else {
			dimm_populated[dimm_num] = FALSE;
#if 0
			printf("DIMM slot %lu: Not populated\n", dimm_num);
#endif
		}
	}

	if (dimm_found == FALSE) {
		printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
		hang();
	}
}

void check_mem_type(unsigned long*   dimm_populated,
		    unsigned char*   iic0_dimm_addr,
		    unsigned long    num_dimm_banks)
{
	unsigned long dimm_num;
	unsigned char dimm_type;

	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
		if (dimm_populated[dimm_num] == TRUE) {
			dimm_type = spd_read(iic0_dimm_addr[dimm_num], 2);
			switch (dimm_type) {
			case 7:
#if 0
				printf("DIMM slot %lu: DDR SDRAM detected\n", dimm_num);
#endif
				break;
			default:
				printf("ERROR: Unsupported DIMM detected in slot %lu.\n",
				       dimm_num);
				printf("Only DDR SDRAM DIMMs are supported.\n");
				printf("Replace the DIMM module with a supported DIMM.\n\n");
				hang();
				break;
			}
		}
	}
}


void check_volt_type(unsigned long*   dimm_populated,
		     unsigned char*   iic0_dimm_addr,
		     unsigned long    num_dimm_banks)
{
	unsigned long dimm_num;
	unsigned long voltage_type;

	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
		if (dimm_populated[dimm_num] == TRUE) {