csu3_am335x/board-support/u-boot-2017.01+gitAUTOINC+340fb36f04-g340fb36f04/board/esd/plu405/plu405.c

/*
 * (C) Copyright 2001-2003
 * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <command.h>
#include <malloc.h>
#include <sja1000.h>

#undef FPGA_DEBUG

DECLARE_GLOBAL_DATA_PTR;

extern void lxt971_no_sleep(void);

/* fpga configuration data - gzip compressed and generated by bin2c */
const unsigned char fpgadata[] =
{
#include "fpgadata.c"
};

/*
 * include common fpga code (for esd boards)
 */
#include "../common/fpga.c"

/*
 * generate a short spike on the CAN tx line
 * to bring the couplers in sync
 */
void init_coupler(u32 addr)
{
	struct sja1000_basic_s *ctrl = (struct sja1000_basic_s *)addr;

	/* reset */
	out_8(&ctrl->cr, CR_RR);

	/* dominant */
	out_8(&ctrl->btr0, 0x00); /* btr setup is required */
	out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */
	out_8(&ctrl->oc, OC_TP1 | OC_TN1 | OC_POL1 |
	      OC_TP0 | OC_TN0 | OC_POL0 | OC_MODE1);
	out_8(&ctrl->cr, 0x00);

	/* delay */
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);

	/* reset */
	out_8(&ctrl->cr, CR_RR);
}

int board_early_init_f(void)
{
	/*
	 * IRQ 0-15  405GP internally generated; active high; level sensitive
	 * IRQ 16    405GP internally generated; active low; level sensitive
	 * IRQ 17-24 RESERVED
	 * IRQ 25 (EXT IRQ 0) CAN0; active low; level sensitive
	 * IRQ 26 (EXT IRQ 1) SER0 ; active low; level sensitive
	 * IRQ 27 (EXT IRQ 2) SER1; active low; level sensitive
	 * IRQ 28 (EXT IRQ 3) FPGA 0; active low; level sensitive
	 * IRQ 29 (EXT IRQ 4) FPGA 1; active low; level sensitive
	 * IRQ 30 (EXT IRQ 5) PCI INTA; active low; level sensitive
	 * IRQ 31 (EXT IRQ 6) COMPACT FLASH; active high; level sensitive
	 */
	mtdcr(UIC0SR, 0xFFFFFFFF);       /* clear all ints */
	mtdcr(UIC0ER, 0x00000000);       /* disable all ints */
	mtdcr(UIC0CR, 0x00000000);       /* set all to be non-critical*/
	mtdcr(UIC0PR, 0xFFFFFF99);       /* set int polarities */
	mtdcr(UIC0TR, 0x10000000);       /* set int trigger levels */
	mtdcr(UIC0VCR, 0x00000001);      /* set vect base=0,INT0 highest prio */
	mtdcr(UIC0SR, 0xFFFFFFFF);       /* clear all ints */

	/*
	 * EBC Configuration Register: set ready timeout to
	 * 512 ebc-clks -> ca. 15 us
	 */
	mtebc(EBC0_CFG, 0xa8400000); /* ebc always driven */

	return 0;
}

int misc_init_r(void)
{
	unsigned char *dst;
	unsigned char fctr;
	ulong len = sizeof(fpgadata);
	int status;
	int index;
	int i;

	/* adjust flash start and offset */
	gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
	gd->bd->bi_flashoffset = 0;

	dst = malloc(CONFIG_SYS_FPGA_MAX_SIZE);
	if (gunzip(dst, CONFIG_SYS_FPGA_MAX_SIZE,
		   (uchar *)fpgadata, &len) != 0) {
		printf("GUNZIP ERROR - must RESET board to recover\n");
		do_reset(NULL, 0, 0, NULL);
	}

	status = fpga_boot(dst, len);
	if (status != 0) {
		printf("\nFPGA: Booting failed ");
		switch (status) {
		case ERROR_FPGA_PRG_INIT_LOW:
			printf("(Timeout: INIT not low "
			       "after asserting PROGRAM*)\n");
			break;
		case ERROR_FPGA_PRG_INIT_HIGH:
			printf("(Timeout: INIT not high "
			       "after deasserting PROGRAM*)\n");
			break;
		case ERROR_FPGA_PRG_DONE:
			printf("(Timeout: DONE not high "
			       "after programming FPGA)\n");
			break;
		}

		/* display infos on fpgaimage */
		index = 15;
		for (i=0; i<4; i++) {
			len = dst[index];
			printf("FPGA: %s\n", &(dst[index+1]));
			index += len+3;
		}
		putc ('\n');
		/* delayed reboot */
		for (i=20; i>0; i--) {
			printf("Rebooting in %2d seconds \r",i);
			for (index=0;index<1000;index++)
				udelay(1000);
		}
		putc('\n');
		do_reset(NULL, 0, 0, NULL);
	}

	puts("FPGA:  ");

	/* display infos on fpgaimage */
	index = 15;
	for (i=0; i<4; i++) {
		len = dst[index];
		printf("%s ", &(dst[index+1]));
		index += len+3;
	}
	putc('\n');

	free(dst);

	/*
	 * Reset FPGA via FPGA_DATA pin
	 */
	SET_FPGA(FPGA_PRG | FPGA_CLK);
	udelay(1000); /* wait 1ms */
	SET_FPGA(FPGA_PRG | FPGA_CLK | FPGA_DATA);
	udelay(1000); /* wait 1ms */

	/*
	 * Reset external DUARTs
	 */
	out_be32((void*)GPIO0_OR,
		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_DUART_RST);
	udelay(10);
	out_be32((void*)GPIO0_OR,
		 in_be32((void*)GPIO0_OR) & ~CONFIG_SYS_DUART_RST);
	udelay(1000);

	/*
	 * Set NAND-FLASH GPIO signals to default
	 */
	out_be32((void*)GPIO0_OR,
		 in_be32((void*)GPIO0_OR) &
		 ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE));
	out_be32((void*)GPIO0_OR,
		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_NAND_CE);

	/*
	 * Setup EEPROM write protection
	 */
	out_be32((void*)GPIO0_OR,
		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_EEPROM_WP);
	out_be32((void*)GPIO0_TCR,
		 in_be32((void*)GPIO0_TCR) | CONFIG_SYS_EEPROM_WP);

	/*
	 * Enable interrupts in exar duart mcr[3]
	 */
	out_8((void *)DUART0_BA + 4, 0x08);
	out_8((void *)DUART1_BA + 4, 0x08);

	/*
	 * Enable auto RS485 mode in 2nd external uart
	 */
	out_8((void *)DUART1_BA + 3, 0xbf); /* write LCR */
	fctr = in_8((void *)DUART1_BA + 1); /* read FCTR */
	fctr |= 0x08;                       /* enable RS485 mode */
	out_8((void *)DUART1_BA + 1, fctr); /* write FCTR */
	out_8((void *)DUART1_BA + 3, 0);    /* write LCR */

	/*
	 * Init magnetic couplers
	 */
	if (!getenv("noinitcoupler")) {
		init_coupler(CAN0_BA);
		init_coupler(CAN1_BA);
	}
	return 0;
}

/*
 * Check Board Identity:
 */
int checkboard(void)
{
	char str[64];
	int i = getenv_f("serial#", str, sizeof(str));

	puts("Board: ");

	if (i == -1)
		puts("### No HW ID - assuming PLU405");
	else
		puts(str);

	putc('\n');
	return 0;
}

#ifdef CONFIG_IDE_RESET
#define FPGA_CTRL (CONFIG_SYS_FPGA_BASE_ADDR + CONFIG_SYS_FPGA_CTRL)
void ide_set_reset(int on)
{
	/*
	 * Assert or deassert CompactFlash Reset Pin
	 */
	if (on) {		/* assert RESET */
		out_be16((void *)FPGA_CTRL,
			 in_be16((void *)FPGA_CTRL) &
			 ~CONFIG_SYS_FPGA_CTRL_CF_RESET);
	} else {		/* release RESET */
		out_be16((void *)FPGA_CTRL,
			 in_be16((void *)FPGA_CTRL) |
			 CONFIG_SYS_FPGA_CTRL_CF_RESET);
	}
}
#endif /* CONFIG_IDE_RESET */

void reset_phy(void)
{
#ifdef CONFIG_LXT971_NO_SLEEP

	/*
	 * Disable sleep mode in LXT971
	 */
	lxt971_no_sleep();
#endif
}

#if defined(CONFIG_SYS_EEPROM_WREN)
/* Input: <dev_addr>  I2C address of EEPROM device to enable.
 *	       <state> -1: deliver current state
 *			0: disable write
 *			1: enable write
 *  Returns:	       -1: wrong device address
 *			0: dis-/en- able done
 *		      0/1: current state if <state> was -1.
 */
int eeprom_write_enable(unsigned dev_addr, int state)
{
	if (CONFIG_SYS_I2C_EEPROM_ADDR != dev_addr) {
		return -1;
	} else {
		switch (state) {
		case 1:
			/* Enable write access, clear bit GPIO0. */
			out_be32((void*)GPIO0_OR,
				 in_be32((void*)GPIO0_OR) &
				 ~CONFIG_SYS_EEPROM_WP);
			state = 0;
			break;
		case 0:
			/* Disable write access, set bit GPIO0. */
			out_be32((void*)GPIO0_OR,
				 in_be32((void*)GPIO0_OR) |
				 CONFIG_SYS_EEPROM_WP);
			state = 0;
			break;
		default:
			/* Read current status back. */
			state = ((in_be32((void*)GPIO0_OR) &
				       CONFIG_SYS_EEPROM_WP) == 0);
			break;
		}
	}
	return state;
}

int do_eep_wren(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int query = argc == 1;
	int state = 0;

	if (query) {
		/* Query write access state. */
		state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR, -1);
		if (state < 0) {
			puts("Query of write access state failed.\n");
		} else {
			printf("Write access for device 0x%0x is %sabled.\n",
			       CONFIG_SYS_I2C_EEPROM_ADDR,
			       state ? "en" : "dis");
			state = 0;
		}
	} else {
		if (argv[1][0] == '0') {
			/* Disable write access. */
			state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
						    0);
		} else {
			/* Enable write access. */
			state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
						    1);
		}
		if (state < 0)
			puts("Setup of write access state failed.\n");
	}

	return state;
}

U_BOOT_CMD(eepwren,	2,	0,	do_eep_wren,
	"Enable / disable / query EEPROM write access",
	""
);
#endif /* #if defined(CONFIG_SYS_EEPROM_WREN) */