board/taskit/stamp9g20/stamp9g20.c

/*
 * (C) Copyright 2007-2008
 * Stelian Pop <stelian@popies.net>
 * Lead Tech Design <www.leadtechdesign.com>
 *
 * Achim Ehrlich <aehrlich@taskit.de>
 * taskit GmbH <www.taskit.de>
 *
 * (C) Copyright 2012-
 * Markus Hubig <mhubig@imko.de>
 * IMKO GmbH <www.imko.de>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/at91sam9260_matrix.h>
#include <asm/arch/at91sam9_smc.h>
#include <asm/arch/at91_common.h>
#include <asm/arch/at91_pmc.h>
#include <asm/arch/at91_rstc.h>
#include <asm/arch/gpio.h>
#include <watchdog.h>

#ifdef CONFIG_MACB
# include <net.h>
# include <netdev.h>
#endif

DECLARE_GLOBAL_DATA_PTR;

static void stamp9G20_nand_hw_init(void)
{
	struct at91_smc *smc = (struct at91_smc *)ATMEL_BASE_SMC;
	struct at91_matrix *matrix = (struct at91_matrix *)ATMEL_BASE_MATRIX;
	unsigned long csa;

	/* Assign CS3 to NAND/SmartMedia Interface */
	csa = readl(&matrix->ebicsa);
	csa |= AT91_MATRIX_CS3A_SMC_SMARTMEDIA;
	writel(csa, &matrix->ebicsa);

	/* Configure SMC CS3 for NAND/SmartMedia */
	writel(AT91_SMC_SETUP_NWE(1) | AT91_SMC_SETUP_NCS_WR(0) |
		AT91_SMC_SETUP_NRD(1) | AT91_SMC_SETUP_NCS_RD(0),
		&smc->cs[3].setup);
	writel(AT91_SMC_PULSE_NWE(3) | AT91_SMC_PULSE_NCS_WR(3) |
		AT91_SMC_PULSE_NRD(3) | AT91_SMC_PULSE_NCS_RD(3),
		&smc->cs[3].pulse);
	writel(AT91_SMC_CYCLE_NWE(5) | AT91_SMC_CYCLE_NRD(5),
		&smc->cs[3].cycle);
	writel(AT91_SMC_MODE_RM_NRD | AT91_SMC_MODE_WM_NWE |
		AT91_SMC_MODE_EXNW_DISABLE |
		AT91_SMC_MODE_DBW_8 |
		AT91_SMC_MODE_TDF_CYCLE(2),
		&smc->cs[3].mode);

	/* Configure RDY/BSY */
	at91_set_gpio_input(CONFIG_SYS_NAND_READY_PIN, 1);

	/* Enable NandFlash */
	at91_set_gpio_output(CONFIG_SYS_NAND_ENABLE_PIN, 1);
}

#ifdef CONFIG_MACB
static void stamp9G20_macb_hw_init(void)
{
	struct at91_port *pioa = (struct at91_port *)ATMEL_BASE_PIOA;
	struct at91_rstc *rstc = (struct at91_rstc *)ATMEL_BASE_RSTC;
	unsigned long erstl;

	/* Enable the PHY Chip via PA26 on the Stamp 2 Adaptor */
	at91_set_gpio_output(AT91_PIN_PA26, 0);

	/*
	 * Disable pull-up on:
	 *	RXDV (PA17) => PHY normal mode (not Test mode)
	 *	ERX0 (PA14) => PHY ADDR0
	 *	ERX1 (PA15) => PHY ADDR1
	 *	ERX2 (PA25) => PHY ADDR2
	 *	ERX3 (PA26) => PHY ADDR3
	 *	ECRS (PA28) => PHY ADDR4  => PHYADDR = 0x0
	 *
	 * PHY has internal pull-down
	 */
	writel(pin_to_mask(AT91_PIN_PA14) |
		pin_to_mask(AT91_PIN_PA15) |
		pin_to_mask(AT91_PIN_PA17) |
		pin_to_mask(AT91_PIN_PA18) |
		pin_to_mask(AT91_PIN_PA28),
		&pioa->pudr);

	erstl = readl(&rstc->mr) & AT91_RSTC_MR_ERSTL_MASK;

	/* Need to reset PHY -> 500ms reset */
	writel(AT91_RSTC_KEY | (AT91_RSTC_MR_ERSTL(13) &
				~AT91_RSTC_MR_URSTEN), &rstc->mr);
	writel(AT91_RSTC_KEY | AT91_RSTC_CR_EXTRST, &rstc->cr);

	/* Wait for end of hardware reset */
	unsigned long start = get_timer(0);
	unsigned long timeout = 1000; /* 1000ms */

	while (!(readl(&rstc->sr) & AT91_RSTC_SR_NRSTL)) {

		/* avoid shutdown by watchdog */
		WATCHDOG_RESET();
		mdelay(10);

		/* timeout for not getting stuck in an endless loop */
		if (get_timer(start) >= timeout) {
			puts("*** ERROR: Timeout waiting for PHY reset!\n");
			break;
		};
	};

	/* Restore NRST value */
	writel(AT91_RSTC_KEY | erstl | AT91_RSTC_MR_URSTEN,
		&rstc->mr);

	/* Re-enable pull-up */
	writel(pin_to_mask(AT91_PIN_PA14) |
		pin_to_mask(AT91_PIN_PA15) |
		pin_to_mask(AT91_PIN_PA17) |
		pin_to_mask(AT91_PIN_PA18) |
		pin_to_mask(AT91_PIN_PA28),
		&pioa->puer);

	/* Initialize EMAC=MACB hardware */
	at91_macb_hw_init();
}
#endif /* CONFIG_MACB */

int board_early_init_f(void)
{
	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;

	/* Enable clocks for all PIOs */
	writel((1 << ATMEL_ID_PIOA) | (1 << ATMEL_ID_PIOB) |
		(1 << ATMEL_ID_PIOC), &pmc->pcer);

	return 0;
}

int board_postclk_init(void)
{
	/*
	 * Initialize the serial interface here, because be need a running
	 * timer to set PC9 to high and wait for some time to enable the
	 * level converter of the RS232 interface on the PortuxG20 board.
	 */

#ifdef CONFIG_PORTUXG20
	at91_set_gpio_output(AT91_PIN_PC9, 1);
	mdelay(1);
#endif
	at91_seriald_hw_init();

	return 0;
}

int board_init(void)
{
	/* Adress of boot parameters */
	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;

	stamp9G20_nand_hw_init();
#ifdef CONFIG_MACB
	stamp9G20_macb_hw_init();
#endif
	return 0;
}

int dram_init(void)
{
	gd->ram_size = get_ram_size(
		(void *)CONFIG_SYS_SDRAM_BASE,
		CONFIG_SYS_SDRAM_SIZE);
	return 0;
}

#ifdef CONFIG_MACB
int board_eth_init(bd_t *bis)
{
	return macb_eth_initialize(0, (void *)ATMEL_BASE_EMAC0, 0x00);
}
#endif /* CONFIG_MACB */