arch/mips/tx4938/common/setup.c

   1 /*
   2  * linux/arch/mips/tx4938/common/setup.c
   3  *
   4  * common tx4938 setup routines
   5  *
   6  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   7  * terms of the GNU General Public License version 2. This program is
   8  * licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  *
  11  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  12  */
  13
  14 #include <linux/errno.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/module.h>
  18 #include <linux/signal.h>
  19 #include <linux/sched.h>
  20 #include <linux/types.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/ioport.h>
  23 #include <linux/timex.h>
  24 #include <linux/slab.h>
  25 #include <linux/random.h>
  26 #include <linux/irq.h>
  27 #include <asm/bitops.h>
  28 #include <asm/bootinfo.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/mipsregs.h>
  32 #include <asm/system.h>
  33 #include <asm/time.h>
  34 #include <asm/time.h>
  35 #include <asm/tx4938/rbtx4938.h>
  36
  37 extern void toshiba_rbtx4938_setup(void);
  38 extern void rbtx4938_time_init(void);
  39
  40 void __init tx4938_setup(void);
  41 void __init tx4938_time_init(void);
  42 void dump_cp0(char *key);
  43
  44 void (*__wbflush) (void);
  45
  46 static void
  47 tx4938_write_buffer_flush(void)
  48 {
  49         mmiowb();
  50
  51         __asm__ __volatile__(
  52                 ".set   push\n\t"
  53                 ".set   noreorder\n\t"
  54                 "lw     $0,%0\n\t"
  55                 "nop\n\t"
  56                 ".set   pop"
  57                 : /* no output */
  58                 : "m" (*(int *)KSEG1)
  59                 : "memory");
  60 }
  61
  62 void __init
  63 plat_mem_setup(void)
  64 {
  65         board_time_init = tx4938_time_init;
  66         __wbflush = tx4938_write_buffer_flush;
  67         toshiba_rbtx4938_setup();
  68 }
  69
  70 void __init
  71 tx4938_time_init(void)
  72 {
  73         rbtx4938_time_init();
  74 }
  75
  76 void __init plat_timer_setup(struct irqaction *irq)
  77 {
  78         u32 count;
  79         u32 c1;
  80         u32 c2;
  81
  82         setup_irq(TX4938_IRQ_CPU_TIMER, irq);
  83
  84         c1 = read_c0_count();
  85         count = c1 + (mips_hpt_frequency / HZ);
  86         write_c0_compare(count);
  87         c2 = read_c0_count();
  88 }