u-boot/arch/arm/cpu/arm926ejs/mx25/generic.c

/*
 * (C) Copyright 2009 DENX Software Engineering
 * Author: John Rigby <jrigby@gmail.com>
 *
 * Based on mx27/generic.c:
 *  Copyright (c) 2008 Eric Jarrige <eric.jarrige@armadeus.org>
 *  Copyright (c) 2009 Ilya Yanok <yanok@emcraft.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <div64.h>
#include <netdev.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/imx25-pinmux.h>
#ifdef CONFIG_MXC_MMC
#include <asm/arch/mxcmmc.h>
#endif

/*
 *  get the system pll clock in Hz
 *
 *                  mfi + mfn / (mfd +1)
 *  f = 2 * f_ref * --------------------
 *                        pd + 1
 */
static unsigned int imx_decode_pll (unsigned int pll, unsigned int f_ref)
{
	unsigned int mfi = (pll >> CCM_PLL_MFI_SHIFT)
	    & CCM_PLL_MFI_MASK;
	unsigned int mfn = (pll >> CCM_PLL_MFN_SHIFT)
	    & CCM_PLL_MFN_MASK;
	unsigned int mfd = (pll >> CCM_PLL_MFD_SHIFT)
	    & CCM_PLL_MFD_MASK;
	unsigned int pd = (pll >> CCM_PLL_PD_SHIFT)
	    & CCM_PLL_PD_MASK;

	mfi = mfi <= 5 ? 5 : mfi;

	return lldiv (2 * (u64) f_ref * (mfi * (mfd + 1) + mfn),
		      (mfd + 1) * (pd + 1));
}

static ulong imx_get_mpllclk (void)
{
	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
	ulong fref = 24000000;

	return imx_decode_pll (readl (&ccm->mpctl), fref);
}

ulong imx_get_armclk (void)
{
	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
	ulong cctl = readl (&ccm->cctl);
	ulong fref = imx_get_mpllclk ();
	ulong div;

	if (cctl & CCM_CCTL_ARM_SRC)
		fref = lldiv ((fref * 3), 4);

	div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
	       & CCM_CCTL_ARM_DIV_MASK) + 1;

	return lldiv (fref, div);
}

ulong imx_get_ahbclk (void)
{
	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
	ulong cctl = readl (&ccm->cctl);
	ulong fref = imx_get_armclk ();
	ulong div;

	div = ((cctl >> CCM_CCTL_AHB_DIV_SHIFT)
	       & CCM_CCTL_AHB_DIV_MASK) + 1;

	return lldiv (fref, div);
}

ulong imx_get_perclk (int clk)
{
	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
	ulong fref = imx_get_ahbclk ();
	ulong div;

	div = readl (&ccm->pcdr[CCM_PERCLK_REG (clk)]);
	div = ((div >> CCM_PERCLK_SHIFT (clk)) & CCM_PERCLK_MASK) + 1;

	return lldiv (fref, div);
}

#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo (void)
{
	char buf[32];

	printf ("CPU:   Freescale i.MX25 at %s MHz\n\n",
		strmhz (buf, imx_get_armclk ()));
	return 0;
}
#endif

int cpu_eth_init (bd_t * bis)
{
#if defined(CONFIG_FEC_MXC)
	struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
	ulong val;

	val = readl (&ccm->cgr0);
	val |= (1 << 23);
	writel (val, &ccm->cgr0);
	return fecmxc_initialize (bis);
#else
	return 0;
#endif
}

/*
 * Initializes on-chip MMC controllers.
 * to override, implement board_mmc_init()
 */
int cpu_mmc_init (bd_t * bis)
{
#ifdef CONFIG_MXC_MMC
	return mxc_mmc_init (bis);
#else
	return 0;
#endif
}

#ifdef CONFIG_MXC_UART
void mx25_uart_init_pins (void)
{
	struct iomuxc_mux_ctl *muxctl;
	struct iomuxc_pad_ctl *padctl;
	u32 inpadctl;
	u32 outpadctl;
	u32 muxmode0;

	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
	padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
	muxmode0 = MX25_PIN_MUX_MODE (0);
	/*
	 * set up input pins with hysteresis and 100K pull-ups
	 */
	inpadctl = MX25_PIN_PAD_CTL_HYS
	    | MX25_PIN_PAD_CTL_PKE
	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PU;

	/*
	 * set up output pins with 100K pull-downs
	 * FIXME: need to revisit this
	 *      PUE is ignored if PKE is not set
	 *      so the right value here is likely
	 *        0x0 for no pull up/down
	 *      or
	 *        0xc0 for 100k pull down
	 */
	outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;

	/* UART1 */
	/* rxd */
	writel (muxmode0, &muxctl->pad_uart1_rxd);
	writel (inpadctl, &padctl->pad_uart1_rxd);

	/* txd */
	writel (muxmode0, &muxctl->pad_uart1_txd);
	writel (outpadctl, &padctl->pad_uart1_txd);

	/* rts */
	writel (muxmode0, &muxctl->pad_uart1_rts);
	writel (outpadctl, &padctl->pad_uart1_rts);

	/* cts */
	writel (muxmode0, &muxctl->pad_uart1_cts);
	writel (inpadctl, &padctl->pad_uart1_cts);
}
#endif /* CONFIG_MXC_UART */

#ifdef CONFIG_FEC_MXC
void mx25_fec_init_pins (void)
{
	struct iomuxc_mux_ctl *muxctl;
	struct iomuxc_pad_ctl *padctl;
	u32 inpadctl_100kpd;
	u32 inpadctl_22kpu;
	u32 outpadctl;
	u32 muxmode0;

	muxctl = (struct iomuxc_mux_ctl *)IMX_IOPADMUX_BASE;
	padctl = (struct iomuxc_pad_ctl *)IMX_IOPADCTL_BASE;
	muxmode0 = MX25_PIN_MUX_MODE (0);
	inpadctl_100kpd = MX25_PIN_PAD_CTL_HYS
	    | MX25_PIN_PAD_CTL_PKE
	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;
	inpadctl_22kpu = MX25_PIN_PAD_CTL_HYS
	    | MX25_PIN_PAD_CTL_PKE
	    | MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_22K_PU;
	/*
	 * set up output pins with 100K pull-downs
	 * FIXME: need to revisit this
	 *      PUE is ignored if PKE is not set
	 *      so the right value here is likely
	 *        0x0 for no pull
	 *      or
	 *        0xc0 for 100k pull down
	 */
	outpadctl = MX25_PIN_PAD_CTL_PUE | MX25_PIN_PAD_CTL_100K_PD;

	/* FEC_TX_CLK */
	writel (muxmode0, &muxctl->pad_fec_tx_clk);
	writel (inpadctl_100kpd, &padctl->pad_fec_tx_clk);

	/* FEC_RX_DV */
	writel (muxmode0, &muxctl->pad_fec_rx_dv);
	writel (inpadctl_100kpd, &padctl->pad_fec_rx_dv);

	/* FEC_RDATA0 */
	writel (muxmode0, &muxctl->pad_fec_rdata0);
	writel (inpadctl_100kpd, &padctl->pad_fec_rdata0);

	/* FEC_TDATA0 */
	writel (muxmode0, &muxctl->pad_fec_tdata0);
	writel (outpadctl, &padctl->pad_fec_tdata0);

	/* FEC_TX_EN */
	writel (muxmode0, &muxctl->pad_fec_tx_en);
	writel (outpadctl, &padctl->pad_fec_tx_en);

	/* FEC_MDC */
	writel (muxmode0, &muxctl->pad_fec_mdc);
	writel (outpadctl, &padctl->pad_fec_mdc);

	/* FEC_MDIO */
	writel (muxmode0, &muxctl->pad_fec_mdio);
	writel (inpadctl_22kpu, &padctl->pad_fec_mdio);

	/* FEC_RDATA1 */
	writel (muxmode0, &muxctl->pad_fec_rdata1);
	writel (inpadctl_100kpd, &padctl->pad_fec_rdata1);

	/* FEC_TDATA1 */
	writel (muxmode0, &muxctl->pad_fec_tdata1);
	writel (outpadctl, &padctl->pad_fec_tdata1);

}
#endif /* CONFIG_FEC_MXC */