release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/alchemy/devboards/pb1200/board_setup.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Alchemy Pb1200/Db1200 board setup.
   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
  27 #include <linux/init.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/sched.h>
  30
  31 #include <asm/mach-au1x00/au1000.h>
  32 #include <asm/mach-db1x00/bcsr.h>
  33
  34 #ifdef CONFIG_MIPS_PB1200
  35 #include <asm/mach-pb1x00/pb1200.h>
  36 #endif
  37
  38 #ifdef CONFIG_MIPS_DB1200
  39 #include <asm/mach-db1x00/db1200.h>
  40 #define PB1200_INT_BEGIN DB1200_INT_BEGIN
  41 #define PB1200_INT_END DB1200_INT_END
  42 #endif
  43
  44 #include <prom.h>
  45
  46 const char *get_system_type(void)
  47 {
  48         return "Alchemy Pb1200";
  49 }
  50
  51 void __init board_setup(void)
  52 {
  53         printk(KERN_INFO "AMD Alchemy Pb1200 Board\n");
  54         bcsr_init(PB1200_BCSR_PHYS_ADDR,
  55                   PB1200_BCSR_PHYS_ADDR + PB1200_BCSR_HEXLED_OFS);
  56
  57
  58 #if defined(CONFIG_I2C_AU1550)
  59         {
  60                 u32 freq0, clksrc;
  61                 u32 pin_func;
  62
  63                 /* Select SMBus in CPLD */
  64                 bcsr_mod(BCSR_RESETS, BCSR_RESETS_PSC0MUX, 0);
  65
  66                 pin_func = au_readl(SYS_PINFUNC);
  67                 au_sync();
  68                 pin_func &= ~(SYS_PINFUNC_P0A | SYS_PINFUNC_P0B);
  69                 /* Set GPIOs correctly */
  70                 pin_func |= 2 << 17;
  71                 au_writel(pin_func, SYS_PINFUNC);
  72                 au_sync();
  73
  74                 /* The I2C driver depends on 50 MHz clock */
  75                 freq0 = au_readl(SYS_FREQCTRL0);
  76                 au_sync();
  77                 freq0 &= ~(SYS_FC_FRDIV1_MASK | SYS_FC_FS1 | SYS_FC_FE1);
  78                 freq0 |= 3 << SYS_FC_FRDIV1_BIT;
  79                 /* 396 MHz / (3 + 1) * 2 == 49.5 MHz */
  80                 au_writel(freq0, SYS_FREQCTRL0);
  81                 au_sync();
  82                 freq0 |= SYS_FC_FE1;
  83                 au_writel(freq0, SYS_FREQCTRL0);
  84                 au_sync();
  85
  86                 clksrc = au_readl(SYS_CLKSRC);
  87                 au_sync();
  88                 clksrc &= ~(SYS_CS_CE0 | SYS_CS_DE0 | SYS_CS_ME0_MASK);
  89                 /* Bit 22 is EXTCLK0 for PSC0 */
  90                 clksrc |= SYS_CS_MUX_FQ1 << SYS_CS_ME0_BIT;
  91                 au_writel(clksrc, SYS_CLKSRC);
  92                 au_sync();
  93         }
  94 #endif
  95
  96         /*
  97          * The Pb1200 development board uses external MUX for PSC0 to
  98          * support SMB/SPI. bcsr_resets bit 12: 0=SMB 1=SPI
  99          */
 100 #ifdef CONFIG_I2C_AU1550
 101         bcsr_mod(BCSR_RESETS, BCSR_RESETS_PSC0MUX, 0);
 102 #endif
 103         au_sync();
 104 }
 105
 106 static int __init pb1200_init_irq(void)
 107 {
 108         /* We have a problem with CPLD rev 3. */
 109         if (BCSR_WHOAMI_CPLD(bcsr_read(BCSR_WHOAMI)) <= 3) {
 110                 printk(KERN_ERR "WARNING!!!\n");
 111                 printk(KERN_ERR "WARNING!!!\n");
 112                 printk(KERN_ERR "WARNING!!!\n");
 113                 printk(KERN_ERR "WARNING!!!\n");
 114                 printk(KERN_ERR "WARNING!!!\n");
 115                 printk(KERN_ERR "WARNING!!!\n");
 116                 printk(KERN_ERR "Pb1200 must be at CPLD rev 4. Please have Pb1200\n");
 117                 printk(KERN_ERR "updated to latest revision. This software will\n");
 118                 printk(KERN_ERR "not work on anything less than CPLD rev 4.\n");
 119                 printk(KERN_ERR "WARNING!!!\n");
 120                 printk(KERN_ERR "WARNING!!!\n");
 121                 printk(KERN_ERR "WARNING!!!\n");
 122                 printk(KERN_ERR "WARNING!!!\n");
 123                 printk(KERN_ERR "WARNING!!!\n");
 124                 printk(KERN_ERR "WARNING!!!\n");
 125                 panic("Game over.  Your score is 0.");
 126         }
 127
 128         set_irq_type(AU1200_GPIO7_INT, IRQF_TRIGGER_LOW);
 129         bcsr_init_irq(PB1200_INT_BEGIN, PB1200_INT_END, AU1200_GPIO7_INT);
 130
 131         return 0;
 132 }
 133 arch_initcall(pb1200_init_irq);
 134
 135
 136 int board_au1200fb_panel(void)
 137 {
 138         return (bcsr_read(BCSR_SWITCHES) >> 8) & 0x0f;
 139 }
 140
 141 int board_au1200fb_panel_init(void)
 142 {
 143         /* Apply power */
 144         bcsr_mod(BCSR_BOARD, 0, BCSR_BOARD_LCDVEE | BCSR_BOARD_LCDVDD |
 145                                 BCSR_BOARD_LCDBL);
 146         /* printk(KERN_DEBUG "board_au1200fb_panel_init()\n"); */
 147         return 0;
 148 }
 149
 150 int board_au1200fb_panel_shutdown(void)
 151 {
 152         /* Remove power */
 153         bcsr_mod(BCSR_BOARD, BCSR_BOARD_LCDVEE | BCSR_BOARD_LCDVDD |
 154                              BCSR_BOARD_LCDBL, 0);
 155         /* printk(KERN_DEBUG "board_au1200fb_panel_shutdown()\n"); */
 156         return 0;
 157 }