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

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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>
#include <asm/arch/clock.h>
#ifdef CONFIG_FSL_ESDHC
#include <fsl_esdhc.h>
DECLARE_GLOBAL_DATA_PTR;
#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;
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;
mfn = mfn >= 512 ? mfn - 1024 : mfn;
mfd += 1;
pd += 1;
return lldiv(2 * (u64) f_ref * (mfi * mfd + mfn),
mfd * pd);
}
static ulong imx_get_mpllclk(void)
{
struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
ulong fref = MXC_HCLK;
return imx_decode_pll(readl(&ccm->mpctl), fref);
}
static 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((u64) fref * 3, 4);
div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
& CCM_CCTL_ARM_DIV_MASK) + 1;
return fref / div;
}
static 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 fref / div;
}
static ulong imx_get_ipgclk(void)
{
return imx_get_ahbclk() / 2;
}
static 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 fref / div;
}
unsigned int mxc_get_clock(enum mxc_clock clk)
{
if (clk >= MXC_CLK_NUM)
return -1;
switch (clk) {
case MXC_ARM_CLK:
return imx_get_armclk();
case MXC_AHB_CLK:
return imx_get_ahbclk();
case MXC_IPG_CLK:
case MXC_CSPI_CLK:
case MXC_FEC_CLK:
return imx_get_ipgclk();
default:
return imx_get_perclk(clk);
}
}
u32 get_cpu_rev(void)
{
u32 srev;
u32 system_rev = 0x25000;
/* read SREV register from IIM module */
struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
srev = readl(&iim->iim_srev);
switch (srev) {
case 0x00:
system_rev |= CHIP_REV_1_0;
break;
case 0x01:
system_rev |= CHIP_REV_1_1;
break;
case 0x02:
system_rev |= CHIP_REV_1_2;
break;
default:
system_rev |= 0x8000;
break;
}
return system_rev;
}
#if defined(CONFIG_DISPLAY_CPUINFO)
static char *get_reset_cause(void)
{
/* read RCSR register from CCM module */
struct ccm_regs *ccm =
(struct ccm_regs *)IMX_CCM_BASE;
u32 cause = readl(&ccm->rcsr) & 0x0f;
if (cause == 0)
return "POR";
else if (cause == 1)
return "RST";
else if ((cause & 2) == 2)
return "WDOG";
else if ((cause & 4) == 4)
return "SW RESET";
else if ((cause & 8) == 8)
return "JTAG";
else
return "unknown reset";
}
int print_cpuinfo(void)
{
char buf[32];
u32 cpurev = get_cpu_rev();
printf("CPU: Freescale i.MX25 rev%d.%d%s at %s MHz\n",
(cpurev & 0xF0) >> 4, (cpurev & 0x0F),
((cpurev & 0x8000) ? " unknown" : ""),
strmhz(buf, imx_get_armclk()));
printf("Reset cause: %s\n\n", get_reset_cause());
return 0;
}
#endif
void enable_caches(void)
{
#ifndef CONFIG_SYS_DCACHE_OFF
/* Enable D-cache. I-cache is already enabled in start.S */
dcache_enable();
#endif
}
#if defined(CONFIG_FEC_MXC)
/*
* Initializes on-chip ethernet controllers.
* to override, implement board_eth_init()
*/
int cpu_eth_init(bd_t *bis)
{
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);
}
#endif
int get_clocks(void)
{
#ifdef CONFIG_FSL_ESDHC
#if CONFIG_SYS_FSL_ESDHC_ADDR == IMX_MMC_SDHC2_BASE
gd->arch.sdhc_clk = mxc_get_clock(MXC_ESDHC2_CLK);
#else
gd->arch.sdhc_clk = mxc_get_clock(MXC_ESDHC1_CLK);
#endif
#endif
return 0;
}
#ifdef CONFIG_FSL_ESDHC
/*
* Initializes on-chip MMC controllers.
* to override, implement board_mmc_init()
*/
int cpu_mmc_init(bd_t *bis)
{
return fsl_esdhc_mmc_init(bis);
}
#endif
#ifdef CONFIG_MXC_UART
void mx25_uart1_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);
}
void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
{
int i;
struct iim_regs *iim = (struct iim_regs *)IMX_IIM_BASE;
struct fuse_bank *bank = &iim->bank[0];
struct fuse_bank0_regs *fuse =
(struct fuse_bank0_regs *)bank->fuse_regs;
for (i = 0; i < 6; i++)
mac[i] = readl(&fuse->mac_addr[i]) & 0xff;
}
#endif /* CONFIG_FEC_MXC */