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Diffstat (limited to 'cpu/arm926ejs/mx25/generic.c')
| -rw-r--r-- | cpu/arm926ejs/mx25/generic.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/cpu/arm926ejs/mx25/generic.c b/cpu/arm926ejs/mx25/generic.c new file mode 100644 index 0000000..694841d --- /dev/null +++ b/cpu/arm926ejs/mx25/generic.c @@ -0,0 +1,263 @@ +/* + * (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_mpllclk ())); + 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 */ |