arch/mips/alchemy/devboards/db1200/setup.c

   1 /*
   2  * Alchemy/AMD/RMI DB1200 board setup.
   3  *
   4  * Licensed under the terms outlined in the file COPYING in the root of
   5  * this source archive.
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/io.h>
  11 #include <linux/kernel.h>
  12 #include <asm/mach-au1x00/au1000.h>
  13 #include <asm/mach-db1x00/bcsr.h>
  14 #include <asm/mach-db1x00/db1200.h>
  15
  16 const char *get_system_type(void)
  17 {
  18         return "Alchemy Db1200";
  19 }
  20
  21 void __init board_setup(void)
  22 {
  23         unsigned long freq0, clksrc, div, pfc;
  24         unsigned short whoami;
  25
  26         bcsr_init(DB1200_BCSR_PHYS_ADDR,
  27                   DB1200_BCSR_PHYS_ADDR + DB1200_BCSR_HEXLED_OFS);
  28
  29         whoami = bcsr_read(BCSR_WHOAMI);
  30         printk(KERN_INFO "Alchemy/AMD/RMI DB1200 Board, CPLD Rev %d"
  31                 "  Board-ID %d  Daughtercard ID %d\n",
  32                 (whoami >> 4) & 0xf, (whoami >> 8) & 0xf, whoami & 0xf);
  33
  34         /* SMBus/SPI on PSC0, Audio on PSC1 */
  35         pfc = __raw_readl((void __iomem *)SYS_PINFUNC);
  36         pfc &= ~(SYS_PINFUNC_P0A | SYS_PINFUNC_P0B);
  37         pfc &= ~(SYS_PINFUNC_P1A | SYS_PINFUNC_P1B | SYS_PINFUNC_FS3);
  38         pfc |= SYS_PINFUNC_P1C; /* SPI is configured later */
  39         __raw_writel(pfc, (void __iomem *)SYS_PINFUNC);
  40         wmb();
  41
  42         /* Clock configurations: PSC0: ~50MHz via Clkgen0, derived from
  43          * CPU clock; all other clock generators off/unused.
  44          */
  45         div = (get_au1x00_speed() + 25000000) / 50000000;
  46         if (div & 1)
  47                 div++;
  48         div = ((div >> 1) - 1) & 0xff;
  49
  50         freq0 = div << SYS_FC_FRDIV0_BIT;
  51         __raw_writel(freq0, (void __iomem *)SYS_FREQCTRL0);
  52         wmb();
  53         freq0 |= SYS_FC_FE0;    /* enable F0 */
  54         __raw_writel(freq0, (void __iomem *)SYS_FREQCTRL0);
  55         wmb();
  56
  57         /* psc0_intclk comes 1:1 from F0 */
  58         clksrc = SYS_CS_MUX_FQ0 << SYS_CS_ME0_BIT;
  59         __raw_writel(clksrc, (void __iomem *)SYS_CLKSRC);
  60         wmb();
  61 }
  62
  63 /* use the hexleds to count the number of times the cpu has entered
  64  * wait, the dots to indicate whether the CPU is currently idle or
  65  * active (dots off = sleeping, dots on = working) for cases where
  66  * the number doesn't change for a long(er) period of time.
  67  */
  68 static void db1200_wait(void)
  69 {
  70         __asm__("       .set    push                    \n"
  71                 "       .set    mips3                   \n"
  72                 "       .set    noreorder               \n"
  73                 "       cache   0x14, 0(%0)             \n"
  74                 "       cache   0x14, 32(%0)            \n"
  75                 "       cache   0x14, 64(%0)            \n"
  76                 /* dots off: we're about to call wait */
  77                 "       lui     $26, 0xb980             \n"
  78                 "       ori     $27, $0, 3              \n"
  79                 "       sb      $27, 0x18($26)          \n"
  80                 "       sync                            \n"
  81                 "       nop                             \n"
  82                 "       wait                            \n"
  83                 "       nop                             \n"
  84                 "       nop                             \n"
  85                 "       nop                             \n"
  86                 "       nop                             \n"
  87                 "       nop                             \n"
  88                 /* dots on: there's work to do, increment cntr */
  89                 "       lui     $26, 0xb980             \n"
  90                 "       sb      $0, 0x18($26)           \n"
  91                 "       lui     $26, 0xb9c0             \n"
  92                 "       lb      $27, 0($26)             \n"
  93                 "       addiu   $27, $27, 1             \n"
  94                 "       sb      $27, 0($26)             \n"
  95                 "       sync                            \n"
  96                 "       .set    pop                     \n"
  97                 : : "r" (db1200_wait));
  98 }
  99
 100 static int __init db1200_arch_init(void)
 101 {
 102         /* GPIO7 is low-level triggered CPLD cascade */
 103         set_irq_type(AU1200_GPIO7_INT, IRQF_TRIGGER_LOW);
 104         bcsr_init_irq(DB1200_INT_BEGIN, DB1200_INT_END, AU1200_GPIO7_INT);
 105
 106         /* do not autoenable these: CPLD has broken edge int handling,
 107          * and the CD handler setup requires manual enabling to work
 108          * around that.
 109          */
 110         irq_to_desc(DB1200_SD0_INSERT_INT)->status |= IRQ_NOAUTOEN;
 111         irq_to_desc(DB1200_SD0_EJECT_INT)->status |= IRQ_NOAUTOEN;
 112
 113         if (cpu_wait)
 114                 cpu_wait = db1200_wait;
 115
 116         return 0;
 117 }
 118 arch_initcall(db1200_arch_init);