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setup_tx4938.c

/*
 * TX4938/4937 setup routines
 * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
 *        and RBTX49xx patch from CELF patch archive.
 *
 * 2003-2005 (c) MontaVista Software, Inc.
 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/param.h>
#include <linux/ptrace.h>
#include <linux/mtd/physmap.h>
#include <linux/platform_device.h>
#include <asm/reboot.h>
#include <asm/traps.h>
#include <asm/txx9irq.h>
#include <asm/txx9tmr.h>
#include <asm/txx9pio.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/tx4938.h>

static void __init tx4938_wdr_init(void)
{
      /* report watchdog reset status */
      if (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDRST)
            pr_warning("Watchdog reset detected at 0x%lx\n",
                     read_c0_errorepc());
      /* clear WatchDogReset (W1C) */
      tx4938_ccfg_set(TX4938_CCFG_WDRST);
      /* do reset on watchdog */
      tx4938_ccfg_set(TX4938_CCFG_WR);
}

void __init tx4938_wdt_init(void)
{
      txx9_wdt_init(TX4938_TMR_REG(2) & 0xfffffffffULL);
}

static void tx4938_machine_restart(char *command)
{
      local_irq_disable();
      pr_emerg("Rebooting (with %s watchdog reset)...\n",
             (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDREXEN) ?
             "external" : "internal");
      /* clear watchdog status */
      tx4938_ccfg_set(TX4938_CCFG_WDRST); /* W1C */
      txx9_wdt_now(TX4938_TMR_REG(2) & 0xfffffffffULL);
      while (!(____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDRST))
            ;
      mdelay(10);
      if (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_WDREXEN) {
            pr_emerg("Rebooting (with internal watchdog reset)...\n");
            /* External WDRST failed.  Do internal watchdog reset */
            tx4938_ccfg_clear(TX4938_CCFG_WDREXEN);
      }
      /* fallback */
      (*_machine_halt)();
}

void show_registers(struct pt_regs *regs);
static int tx4938_be_handler(struct pt_regs *regs, int is_fixup)
{
      int data = regs->cp0_cause & 4;
      console_verbose();
      pr_err("%cBE exception at %#lx\n", data ? 'D' : 'I', regs->cp0_epc);
      pr_err("ccfg:%llx, toea:%llx\n",
             (unsigned long long)____raw_readq(&tx4938_ccfgptr->ccfg),
             (unsigned long long)____raw_readq(&tx4938_ccfgptr->toea));
#ifdef CONFIG_PCI
      tx4927_report_pcic_status();
#endif
      show_registers(regs);
      panic("BusError!");
}
static void __init tx4938_be_init(void)
{
      board_be_handler = tx4938_be_handler;
}

static struct resource tx4938_sdram_resource[4];
static struct resource tx4938_sram_resource;

#define TX4938_SRAM_SIZE 0x800

void __init tx4938_setup(void)
{
      int i;
      __u32 divmode;
      int cpuclk = 0;
      u64 ccfg;

      txx9_reg_res_init(TX4938_REV_PCODE(), TX4938_REG_BASE,
                    TX4938_REG_SIZE);
      set_c0_config(TX49_CONF_CWFON);

      /* SDRAMC,EBUSC are configured by PROM */
      for (i = 0; i < 8; i++) {
            if (!(TX4938_EBUSC_CR(i) & 0x8))
                  continue;   /* disabled */
            txx9_ce_res[i].start = (unsigned long)TX4938_EBUSC_BA(i);
            txx9_ce_res[i].end =
                  txx9_ce_res[i].start + TX4938_EBUSC_SIZE(i) - 1;
            request_resource(&iomem_resource, &txx9_ce_res[i]);
      }

      /* clocks */
      ccfg = ____raw_readq(&tx4938_ccfgptr->ccfg);
      if (txx9_master_clock) {
            /* calculate gbus_clock and cpu_clock from master_clock */
            divmode = (__u32)ccfg & TX4938_CCFG_DIVMODE_MASK;
            switch (divmode) {
            case TX4938_CCFG_DIVMODE_8:
            case TX4938_CCFG_DIVMODE_10:
            case TX4938_CCFG_DIVMODE_12:
            case TX4938_CCFG_DIVMODE_16:
            case TX4938_CCFG_DIVMODE_18:
                  txx9_gbus_clock = txx9_master_clock * 4; break;
            default:
                  txx9_gbus_clock = txx9_master_clock;
            }
            switch (divmode) {
            case TX4938_CCFG_DIVMODE_2:
            case TX4938_CCFG_DIVMODE_8:
                  cpuclk = txx9_gbus_clock * 2; break;
            case TX4938_CCFG_DIVMODE_2_5:
            case TX4938_CCFG_DIVMODE_10:
                  cpuclk = txx9_gbus_clock * 5 / 2; break;
            case TX4938_CCFG_DIVMODE_3:
            case TX4938_CCFG_DIVMODE_12:
                  cpuclk = txx9_gbus_clock * 3; break;
            case TX4938_CCFG_DIVMODE_4:
            case TX4938_CCFG_DIVMODE_16:
                  cpuclk = txx9_gbus_clock * 4; break;
            case TX4938_CCFG_DIVMODE_4_5:
            case TX4938_CCFG_DIVMODE_18:
                  cpuclk = txx9_gbus_clock * 9 / 2; break;
            }
            txx9_cpu_clock = cpuclk;
      } else {
            if (txx9_cpu_clock == 0)
                  txx9_cpu_clock = 300000000;   /* 300MHz */
            /* calculate gbus_clock and master_clock from cpu_clock */
            cpuclk = txx9_cpu_clock;
            divmode = (__u32)ccfg & TX4938_CCFG_DIVMODE_MASK;
            switch (divmode) {
            case TX4938_CCFG_DIVMODE_2:
            case TX4938_CCFG_DIVMODE_8:
                  txx9_gbus_clock = cpuclk / 2; break;
            case TX4938_CCFG_DIVMODE_2_5:
            case TX4938_CCFG_DIVMODE_10:
                  txx9_gbus_clock = cpuclk * 2 / 5; break;
            case TX4938_CCFG_DIVMODE_3:
            case TX4938_CCFG_DIVMODE_12:
                  txx9_gbus_clock = cpuclk / 3; break;
            case TX4938_CCFG_DIVMODE_4:
            case TX4938_CCFG_DIVMODE_16:
                  txx9_gbus_clock = cpuclk / 4; break;
            case TX4938_CCFG_DIVMODE_4_5:
            case TX4938_CCFG_DIVMODE_18:
                  txx9_gbus_clock = cpuclk * 2 / 9; break;
            }
            switch (divmode) {
            case TX4938_CCFG_DIVMODE_8:
            case TX4938_CCFG_DIVMODE_10:
            case TX4938_CCFG_DIVMODE_12:
            case TX4938_CCFG_DIVMODE_16:
            case TX4938_CCFG_DIVMODE_18:
                  txx9_master_clock = txx9_gbus_clock / 4; break;
            default:
                  txx9_master_clock = txx9_gbus_clock;
            }
      }
      /* change default value to udelay/mdelay take reasonable time */
      loops_per_jiffy = txx9_cpu_clock / HZ / 2;

      /* CCFG */
      tx4938_wdr_init();
      /* clear BusErrorOnWrite flag (W1C) */
      tx4938_ccfg_set(TX4938_CCFG_BEOW);
      /* enable Timeout BusError */
      if (txx9_ccfg_toeon)
            tx4938_ccfg_set(TX4938_CCFG_TOE);

      /* DMA selection */
      txx9_clear64(&tx4938_ccfgptr->pcfg, TX4938_PCFG_DMASEL_ALL);

      /* Use external clock for external arbiter */
      if (!(____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_PCIARB))
            txx9_clear64(&tx4938_ccfgptr->pcfg, TX4938_PCFG_PCICLKEN_ALL);

      printk(KERN_INFO "%s -- %dMHz(M%dMHz) CRIR:%08x CCFG:%llx PCFG:%llx\n",
             txx9_pcode_str,
             (cpuclk + 500000) / 1000000,
             (txx9_master_clock + 500000) / 1000000,
             (__u32)____raw_readq(&tx4938_ccfgptr->crir),
             (unsigned long long)____raw_readq(&tx4938_ccfgptr->ccfg),
             (unsigned long long)____raw_readq(&tx4938_ccfgptr->pcfg));

      printk(KERN_INFO "%s SDRAMC --", txx9_pcode_str);
      for (i = 0; i < 4; i++) {
            __u64 cr = TX4938_SDRAMC_CR(i);
            unsigned long base, size;
            if (!((__u32)cr & 0x00000400))
                  continue;   /* disabled */
            base = (unsigned long)(cr >> 49) << 21;
            size = (((unsigned long)(cr >> 33) & 0x7fff) + 1) << 21;
            printk(" CR%d:%016llx", i, (unsigned long long)cr);
            tx4938_sdram_resource[i].name = "SDRAM";
            tx4938_sdram_resource[i].start = base;
            tx4938_sdram_resource[i].end = base + size - 1;
            tx4938_sdram_resource[i].flags = IORESOURCE_MEM;
            request_resource(&iomem_resource, &tx4938_sdram_resource[i]);
      }
      printk(" TR:%09llx\n",
             (unsigned long long)____raw_readq(&tx4938_sdramcptr->tr));

      /* SRAM */
      if (txx9_pcode == 0x4938 && ____raw_readq(&tx4938_sramcptr->cr) & 1) {
            unsigned int size = TX4938_SRAM_SIZE;
            tx4938_sram_resource.name = "SRAM";
            tx4938_sram_resource.start =
                  (____raw_readq(&tx4938_sramcptr->cr) >> (39-11))
                  & ~(size - 1);
            tx4938_sram_resource.end =
                  tx4938_sram_resource.start + TX4938_SRAM_SIZE - 1;
            tx4938_sram_resource.flags = IORESOURCE_MEM;
            request_resource(&iomem_resource, &tx4938_sram_resource);
      }

      /* TMR */
      /* disable all timers */
      for (i = 0; i < TX4938_NR_TMR; i++)
            txx9_tmr_init(TX4938_TMR_REG(i) & 0xfffffffffULL);

      /* DMA */
      for (i = 0; i < 2; i++)
            ____raw_writeq(TX4938_DMA_MCR_MSTEN,
                         (void __iomem *)(TX4938_DMA_REG(i) + 0x50));

      /* PIO */
      txx9_gpio_init(TX4938_PIO_REG & 0xfffffffffULL, 0, TX4938_NUM_PIO);
      __raw_writel(0, &tx4938_pioptr->maskcpu);
      __raw_writel(0, &tx4938_pioptr->maskext);

      if (txx9_pcode == 0x4938) {
            __u64 pcfg = ____raw_readq(&tx4938_ccfgptr->pcfg);
            /* set PCIC1 reset */
            txx9_set64(&tx4938_ccfgptr->clkctr, TX4938_CLKCTR_PCIC1RST);
            if (pcfg & (TX4938_PCFG_ETH0_SEL | TX4938_PCFG_ETH1_SEL)) {
                  mdelay(1);  /* at least 128 cpu clock */
                  /* clear PCIC1 reset */
                  txx9_clear64(&tx4938_ccfgptr->clkctr,
                             TX4938_CLKCTR_PCIC1RST);
            } else {
                  printk(KERN_INFO "%s: stop PCIC1\n", txx9_pcode_str);
                  /* stop PCIC1 */
                  txx9_set64(&tx4938_ccfgptr->clkctr,
                           TX4938_CLKCTR_PCIC1CKD);
            }
            if (!(pcfg & TX4938_PCFG_ETH0_SEL)) {
                  printk(KERN_INFO "%s: stop ETH0\n", txx9_pcode_str);
                  txx9_set64(&tx4938_ccfgptr->clkctr,
                           TX4938_CLKCTR_ETH0RST);
                  txx9_set64(&tx4938_ccfgptr->clkctr,
                           TX4938_CLKCTR_ETH0CKD);
            }
            if (!(pcfg & TX4938_PCFG_ETH1_SEL)) {
                  printk(KERN_INFO "%s: stop ETH1\n", txx9_pcode_str);
                  txx9_set64(&tx4938_ccfgptr->clkctr,
                           TX4938_CLKCTR_ETH1RST);
                  txx9_set64(&tx4938_ccfgptr->clkctr,
                           TX4938_CLKCTR_ETH1CKD);
            }
      }

      _machine_restart = tx4938_machine_restart;
      board_be_init = tx4938_be_init;
}

void __init tx4938_time_init(unsigned int tmrnr)
{
      if (____raw_readq(&tx4938_ccfgptr->ccfg) & TX4938_CCFG_TINTDIS)
            txx9_clockevent_init(TX4938_TMR_REG(tmrnr) & 0xfffffffffULL,
                             TXX9_IRQ_BASE + TX4938_IR_TMR(tmrnr),
                             TXX9_IMCLK);
}

void __init tx4938_sio_init(unsigned int sclk, unsigned int cts_mask)
{
      int i;
      unsigned int ch_mask = 0;

      if (__raw_readq(&tx4938_ccfgptr->pcfg) & TX4938_PCFG_ETH0_SEL)
            ch_mask |= 1 << 1; /* disable SIO1 by PCFG setting */
      for (i = 0; i < 2; i++) {
            if ((1 << i) & ch_mask)
                  continue;
            txx9_sio_init(TX4938_SIO_REG(i) & 0xfffffffffULL,
                        TXX9_IRQ_BASE + TX4938_IR_SIO(i),
                        i, sclk, (1 << i) & cts_mask);
      }
}

void __init tx4938_spi_init(int busid)
{
      txx9_spi_init(busid, TX4938_SPI_REG & 0xfffffffffULL,
                  TXX9_IRQ_BASE + TX4938_IR_SPI);
}

void __init tx4938_ethaddr_init(unsigned char *addr0, unsigned char *addr1)
{
      u64 pcfg = __raw_readq(&tx4938_ccfgptr->pcfg);

      if (addr0 && (pcfg & TX4938_PCFG_ETH0_SEL))
            txx9_ethaddr_init(TXX9_IRQ_BASE + TX4938_IR_ETH0, addr0);
      if (addr1 && (pcfg & TX4938_PCFG_ETH1_SEL))
            txx9_ethaddr_init(TXX9_IRQ_BASE + TX4938_IR_ETH1, addr1);
}

void __init tx4938_mtd_init(int ch)
{
      struct physmap_flash_data pdata = {
            .width = TX4938_EBUSC_WIDTH(ch) / 8,
      };
      unsigned long start = txx9_ce_res[ch].start;
      unsigned long size = txx9_ce_res[ch].end - start + 1;

      if (!(TX4938_EBUSC_CR(ch) & 0x8))
            return;     /* disabled */
      txx9_physmap_flash_init(ch, start, size, &pdata);
}

void __init tx4938_ata_init(unsigned int irq, unsigned int shift, int tune)
{
      struct platform_device *pdev;
      struct resource res[] = {
            {
                  /* .start and .end are filled in later */
                  .flags = IORESOURCE_MEM,
            }, {
                  .start = irq,
                  .flags = IORESOURCE_IRQ,
            },
      };
      struct tx4938ide_platform_info pdata = {
            .ioport_shift = shift,
            /*
             * The IDE driver should not change bus timings if other ISA
             * devices existed.
             */
            .gbus_clock = tune ? txx9_gbus_clock : 0,
      };
      u64 ebccr;
      int i;

      if ((__raw_readq(&tx4938_ccfgptr->pcfg) &
           (TX4938_PCFG_ATA_SEL | TX4938_PCFG_NDF_SEL))
          != TX4938_PCFG_ATA_SEL)
            return;
      for (i = 0; i < 8; i++) {
            /* check EBCCRn.ISA, EBCCRn.BSZ, EBCCRn.ME */
            ebccr = __raw_readq(&tx4938_ebuscptr->cr[i]);
            if ((ebccr & 0x00f00008) == 0x00e00008)
                  break;
      }
      if (i == 8)
            return;
      pdata.ebus_ch = i;
      res[0].start = ((ebccr >> 48) << 20) + 0x10000;
      res[0].end = res[0].start + 0x20000 - 1;
      pdev = platform_device_alloc("tx4938ide", -1);
      if (!pdev ||
          platform_device_add_resources(pdev, res, ARRAY_SIZE(res)) ||
          platform_device_add_data(pdev, &pdata, sizeof(pdata)) ||
          platform_device_add(pdev))
            platform_device_put(pdev);
}

static void __init tx4938_stop_unused_modules(void)
{
      __u64 pcfg, rst = 0, ckd = 0;
      char buf[128];

      buf[0] = '\0';
      local_irq_disable();
      pcfg = ____raw_readq(&tx4938_ccfgptr->pcfg);
      switch (txx9_pcode) {
      case 0x4937:
            if (!(pcfg & TX4938_PCFG_SEL2)) {
                  rst |= TX4938_CLKCTR_ACLRST;
                  ckd |= TX4938_CLKCTR_ACLCKD;
                  strcat(buf, " ACLC");
            }
            break;
      case 0x4938:
            if (!(pcfg & TX4938_PCFG_SEL2) ||
                (pcfg & TX4938_PCFG_ETH0_SEL)) {
                  rst |= TX4938_CLKCTR_ACLRST;
                  ckd |= TX4938_CLKCTR_ACLCKD;
                  strcat(buf, " ACLC");
            }
            if ((pcfg &
                 (TX4938_PCFG_ATA_SEL | TX4938_PCFG_ISA_SEL |
                  TX4938_PCFG_NDF_SEL))
                != TX4938_PCFG_NDF_SEL) {
                  rst |= TX4938_CLKCTR_NDFRST;
                  ckd |= TX4938_CLKCTR_NDFCKD;
                  strcat(buf, " NDFMC");
            }
            if (!(pcfg & TX4938_PCFG_SPI_SEL)) {
                  rst |= TX4938_CLKCTR_SPIRST;
                  ckd |= TX4938_CLKCTR_SPICKD;
                  strcat(buf, " SPI");
            }
            break;
      }
      if (rst | ckd) {
            txx9_set64(&tx4938_ccfgptr->clkctr, rst);
            txx9_set64(&tx4938_ccfgptr->clkctr, ckd);
      }
      local_irq_enable();
      if (buf[0])
            pr_info("%s: stop%s\n", txx9_pcode_str, buf);
}

static int __init tx4938_late_init(void)
{
      if (txx9_pcode != 0x4937 && txx9_pcode != 0x4938)
            return -ENODEV;
      tx4938_stop_unused_modules();
      return 0;
}
late_initcall(tx4938_late_init);

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