release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/txx9/generic/setup_tx3927.c

   1 /*
   2  * TX3927 setup routines
   3  * Based on linux/arch/mips/txx9/jmr3927/setup.c
   4  *
   5  * Copyright 2001 MontaVista Software Inc.
   6  * Copyright (C) 2000-2001 Toshiba Corporation
   7  * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/delay.h>
  16 #include <linux/param.h>
  17 #include <linux/io.h>
  18 #include <linux/mtd/physmap.h>
  19 #include <asm/mipsregs.h>
  20 #include <asm/txx9irq.h>
  21 #include <asm/txx9tmr.h>
  22 #include <asm/txx9pio.h>
  23 #include <asm/txx9/generic.h>
  24 #include <asm/txx9/tx3927.h>
  25
  26 void __init tx3927_wdt_init(void)
  27 {
  28         txx9_wdt_init(TX3927_TMR_REG(2));
  29 }
  30
  31 void __init tx3927_setup(void)
  32 {
  33         int i;
  34         unsigned int conf;
  35
  36         txx9_reg_res_init(TX3927_REV_PCODE(), TX3927_REG_BASE,
  37                           TX3927_REG_SIZE);
  38
  39         /* SDRAMC,ROMC are configured by PROM */
  40         for (i = 0; i < 8; i++) {
  41                 if (!(tx3927_romcptr->cr[i] & 0x8))
  42                         continue;       /* disabled */
  43                 txx9_ce_res[i].start = (unsigned long)TX3927_ROMC_BA(i);
  44                 txx9_ce_res[i].end =
  45                         txx9_ce_res[i].start + TX3927_ROMC_SIZE(i) - 1;
  46                 request_resource(&iomem_resource, &txx9_ce_res[i]);
  47         }
  48
  49         /* clocks */
  50         txx9_gbus_clock = txx9_cpu_clock / 2;
  51         /* change default value to udelay/mdelay take reasonable time */
  52         loops_per_jiffy = txx9_cpu_clock / HZ / 2;
  53
  54         /* CCFG */
  55         /* enable Timeout BusError */
  56         if (txx9_ccfg_toeon)
  57                 tx3927_ccfgptr->ccfg |= TX3927_CCFG_TOE;
  58
  59         /* clear BusErrorOnWrite flag */
  60         tx3927_ccfgptr->ccfg &= ~TX3927_CCFG_BEOW;
  61         if (read_c0_conf() & TX39_CONF_WBON)
  62                 /* Disable PCI snoop */
  63                 tx3927_ccfgptr->ccfg &= ~TX3927_CCFG_PSNP;
  64         else
  65                 /* Enable PCI SNOOP - with write through only */
  66                 tx3927_ccfgptr->ccfg |= TX3927_CCFG_PSNP;
  67         /* do reset on watchdog */
  68         tx3927_ccfgptr->ccfg |= TX3927_CCFG_WR;
  69
  70         printk(KERN_INFO "TX3927 -- CRIR:%08lx CCFG:%08lx PCFG:%08lx\n",
  71                tx3927_ccfgptr->crir,
  72                tx3927_ccfgptr->ccfg, tx3927_ccfgptr->pcfg);
  73
  74         /* TMR */
  75         for (i = 0; i < TX3927_NR_TMR; i++)
  76                 txx9_tmr_init(TX3927_TMR_REG(i));
  77
  78         /* DMA */
  79         tx3927_dmaptr->mcr = 0;
  80         for (i = 0; i < ARRAY_SIZE(tx3927_dmaptr->ch); i++) {
  81                 /* reset channel */
  82                 tx3927_dmaptr->ch[i].ccr = TX3927_DMA_CCR_CHRST;
  83                 tx3927_dmaptr->ch[i].ccr = 0;
  84         }
  85         /* enable DMA */
  86 #ifdef __BIG_ENDIAN
  87         tx3927_dmaptr->mcr = TX3927_DMA_MCR_MSTEN;
  88 #else
  89         tx3927_dmaptr->mcr = TX3927_DMA_MCR_MSTEN | TX3927_DMA_MCR_LE;
  90 #endif
  91
  92         /* PIO */
  93         __raw_writel(0, &tx3927_pioptr->maskcpu);
  94         __raw_writel(0, &tx3927_pioptr->maskext);
  95         txx9_gpio_init(TX3927_PIO_REG, 0, 16);
  96
  97         conf = read_c0_conf();
  98         if (conf & TX39_CONF_DCE) {
  99                 if (!(conf & TX39_CONF_WBON))
 100                         pr_info("TX3927 D-Cache WriteThrough.\n");
 101                 else if (!(conf & TX39_CONF_CWFON))
 102                         pr_info("TX3927 D-Cache WriteBack.\n");
 103                 else
 104                         pr_info("TX3927 D-Cache WriteBack (CWF) .\n");
 105         }
 106 }
 107
 108 void __init tx3927_time_init(unsigned int evt_tmrnr, unsigned int src_tmrnr)
 109 {
 110         txx9_clockevent_init(TX3927_TMR_REG(evt_tmrnr),
 111                              TXX9_IRQ_BASE + TX3927_IR_TMR(evt_tmrnr),
 112                              TXX9_IMCLK);
 113         txx9_clocksource_init(TX3927_TMR_REG(src_tmrnr), TXX9_IMCLK);
 114 }
 115
 116 void __init tx3927_sio_init(unsigned int sclk, unsigned int cts_mask)
 117 {
 118         int i;
 119
 120         for (i = 0; i < 2; i++)
 121                 txx9_sio_init(TX3927_SIO_REG(i),
 122                               TXX9_IRQ_BASE + TX3927_IR_SIO(i),
 123                               i, sclk, (1 << i) & cts_mask);
 124 }
 125
 126 void __init tx3927_mtd_init(int ch)
 127 {
 128         struct physmap_flash_data pdata = {
 129                 .width = TX3927_ROMC_WIDTH(ch) / 8,
 130         };
 131         unsigned long start = txx9_ce_res[ch].start;
 132         unsigned long size = txx9_ce_res[ch].end - start + 1;
 133
 134         if (!(tx3927_romcptr->cr[ch] & 0x8))
 135                 return; /* disabled */
 136         txx9_physmap_flash_init(ch, start, size, &pdata);
 137 }