arch/mips/au1000/pb1100/board_setup.c

   1 /*
   2  * Copyright 2002 MontaVista Software Inc.
   3  * Author: MontaVista Software, Inc.
   4  *              ppopov@mvista.com or source@mvista.com
   5  *
   6  *  This program is free software; you can redistribute  it and/or modify it
   7  *  under  the terms of  the GNU General  Public License as published by the
   8  *  Free Software Foundation;  either version 2 of the  License, or (at your
   9  *  option) any later version.
  10  *
  11  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  12  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  13  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  14  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  15  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  16  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  17  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  18  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  19  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  20  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21  *
  22  *  You should have received a copy of the  GNU General Public License along
  23  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  24  *  675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26 #include <linux/config.h>
  27 #include <linux/init.h>
  28 #include <linux/sched.h>
  29 #include <linux/ioport.h>
  30 #include <linux/mm.h>
  31 #include <linux/console.h>
  32 #include <linux/delay.h>
  33
  34 #include <asm/cpu.h>
  35 #include <asm/bootinfo.h>
  36 #include <asm/irq.h>
  37 #include <asm/mipsregs.h>
  38 #include <asm/reboot.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/au1000.h>
  41 #include <asm/pb1100.h>
  42
  43 #ifdef CONFIG_USB_OHCI
  44 // Enable the workaround for the OHCI DoneHead
  45 // register corruption problem.
  46 #define CONFIG_AU1000_OHCI_FIX
  47         ^^^^^^^^^^^^^^^^^^^^^^
  48     !!! I shall not define symbols starting with CONFIG_ !!!
  49 #endif
  50
  51 void __init board_setup(void)
  52 {
  53         u32 pin_func;
  54         u32 sys_freqctrl, sys_clksrc;
  55
  56         // set AUX clock to 12MHz * 8 = 96 MHz
  57         au_writel(8, SYS_AUXPLL);
  58         au_writel(0, SYS_PININPUTEN);
  59         udelay(100);
  60
  61 #if defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)
  62         // configure pins GPIO[14:9] as GPIO
  63         pin_func = au_readl(SYS_PINFUNC) & (u32)(~0x80);
  64
  65         /* zero and disable FREQ2 */
  66         sys_freqctrl = au_readl(SYS_FREQCTRL0);
  67         sys_freqctrl &= ~0xFFF00000;
  68         au_writel(sys_freqctrl, SYS_FREQCTRL0);
  69
  70         /* zero and disable USBH/USBD/IrDA clock */
  71         sys_clksrc = au_readl(SYS_CLKSRC);
  72         sys_clksrc &= ~0x0000001F;
  73         au_writel(sys_clksrc, SYS_CLKSRC);
  74
  75         sys_freqctrl = au_readl(SYS_FREQCTRL0);
  76         sys_freqctrl &= ~0xFFF00000;
  77
  78         sys_clksrc = au_readl(SYS_CLKSRC);
  79         sys_clksrc &= ~0x0000001F;
  80
  81         // FREQ2 = aux/2 = 48 MHz
  82         sys_freqctrl |= ((0<<22) | (1<<21) | (1<<20));
  83         au_writel(sys_freqctrl, SYS_FREQCTRL0);
  84
  85         /*
  86          * Route 48MHz FREQ2 into USBH/USBD/IrDA
  87          */
  88         sys_clksrc |= ((4<<2) | (0<<1) | 0 );
  89         au_writel(sys_clksrc, SYS_CLKSRC);
  90
  91         /* setup the static bus controller */
  92         au_writel(0x00000002, MEM_STCFG3);  /* type = PCMCIA */
  93         au_writel(0x280E3D07, MEM_STTIME3); /* 250ns cycle time */
  94         au_writel(0x10000000, MEM_STADDR3); /* any PCMCIA select */
  95
  96         // get USB Functionality pin state (device vs host drive pins)
  97         pin_func = au_readl(SYS_PINFUNC) & (u32)(~0x8000);
  98 #ifndef CONFIG_AU1X00_USB_DEVICE
  99         // 2nd USB port is USB host
 100         pin_func |= 0x8000;
 101 #endif
 102         au_writel(pin_func, SYS_PINFUNC);
 103 #endif // defined (CONFIG_USB_OHCI) || defined (CONFIG_AU1X00_USB_DEVICE)
 104
 105         /* Enable sys bus clock divider when IDLE state or no bus activity. */
 106         au_writel(au_readl(SYS_POWERCTRL) | (0x3 << 5), SYS_POWERCTRL);
 107
 108         // Enable the RTC if not already enabled
 109         if (!(readb(0xac000028) & 0x20)) {
 110                 writeb(readb(0xac000028) | 0x20, 0xac000028);
 111                 au_sync();
 112         }
 113         // Put the clock in BCD mode
 114         if (readb(0xac00002C) & 0x4) { /* reg B */
 115                 writeb(readb(0xac00002c) & ~0x4, 0xac00002c);
 116                 au_sync();
 117         }
 118 }