u-boot/arch/arm/mach-davinci/dm644x.c

/*
 * SoC-specific code for tms320dm644x chips
 *
 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
 * Copyright (C) 2008 Lyrtech <www.lyrtech.com>
 * Copyright (C) 2004 Texas Instruments.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/arch/hardware.h>


#define PINMUX0_EMACEN (1 << 31)
#define PINMUX0_AECS5  (1 << 11)
#define PINMUX0_AECS4  (1 << 10)

#define PINMUX1_I2C    (1 <<  7)
#define PINMUX1_UART1  (1 <<  1)
#define PINMUX1_UART0  (1 <<  0)


void davinci_enable_uart0(void)
{
	lpsc_on(DAVINCI_LPSC_UART0);

	/* Bringup UART0 out of reset */
	REG(UART0_PWREMU_MGMT) = 0x00006001;

	/* Enable UART0 MUX lines */
	REG(PINMUX1) |= PINMUX1_UART0;
}

#ifdef CONFIG_DRIVER_TI_EMAC
void davinci_enable_emac(void)
{
	lpsc_on(DAVINCI_LPSC_EMAC);
	lpsc_on(DAVINCI_LPSC_EMAC_WRAPPER);
	lpsc_on(DAVINCI_LPSC_MDIO);

	/* Enable GIO3.3V cells used for EMAC */
	REG(VDD3P3V_PWDN) = 0;

	/* Enable EMAC. */
	REG(PINMUX0) |= PINMUX0_EMACEN;
}
#endif

#ifdef CONFIG_SYS_I2C_DAVINCI
void davinci_enable_i2c(void)
{
	lpsc_on(DAVINCI_LPSC_I2C);

	/* Enable I2C pin Mux */
	REG(PINMUX1) |= PINMUX1_I2C;
}
#endif

void davinci_errata_workarounds(void)
{
	/*
	 * Workaround for TMS320DM6446 errata 1.3.22:
	 *   PSC: PTSTAT Register Does Not Clear After Warm/Maximum Reset
	 *   Revision(s) Affected: 1.3 and earlier
	 */
	REG(PSC_SILVER_BULLET) = 0;

	/*
	 * Set the PR_OLD_COUNT bits in the Bus Burst Priority Register (PBBPR)
	 * as suggested in TMS320DM6446 errata 2.1.2:
	 *
	 * On DM6446 Silicon Revision 2.1 and earlier, under certain conditions
	 * low priority modules can occupy the bus and prevent high priority
	 * modules like the VPSS from getting the required DDR2 throughput.
	 * A hex value of 0x20 should provide a good ARM (cache enabled)
	 * performance and still allow good utilization by the VPSS or other
	 * modules.
	 */
	REG(VBPR) = 0x20;
}