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/*
* (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 */
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