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dt.c

/*
 *    Copyright (C) 2005-2006 Michael Ellerman, IBM Corporation
 *    Copyright (C) 2000-2004, IBM Corporation
 *
 *    Description:
 *      This file contains all the routines to build a flattened device
 *      tree for a legacy iSeries machine.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/pci_ids.h>
#include <linux/threads.h>
#include <linux/bitops.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/if_ether.h>   /* ETH_ALEN */

#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/lppaca.h>
#include <asm/cputable.h>
#include <asm/abs_addr.h>
#include <asm/system.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/udbg.h>

#include "processor_vpd.h"
#include "call_hpt.h"
#include "call_pci.h"
#include "pci.h"
#include "it_exp_vpd_panel.h"
#include "naca.h"

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/*
 * These are created by the linker script at the start and end
 * of the section containing all the strings from this file.
 */
extern char __dt_strings_start[];
extern char __dt_strings_end[];

00059 struct iseries_flat_dt {
      struct boot_param_header header;
      u64 reserve_map[2];
};

static void * __initdata dt_data;

/*
 * Putting these strings here keeps them out of the section
 * that we rename to .dt_strings using objcopy and capture
 * for the strings blob of the flattened device tree.
 */
static char __initdata device_type_cpu[] = "cpu";
static char __initdata device_type_memory[] = "memory";
static char __initdata device_type_serial[] = "serial";
static char __initdata device_type_network[] = "network";
static char __initdata device_type_pci[] = "pci";
static char __initdata device_type_vdevice[] = "vdevice";
static char __initdata device_type_vscsi[] = "vscsi";


/* EBCDIC to ASCII conversion routines */

static unsigned char __init e2a(unsigned char x)
{
      switch (x) {
      case 0x81 ... 0x89:
            return x - 0x81 + 'a';
      case 0x91 ... 0x99:
            return x - 0x91 + 'j';
      case 0xA2 ... 0xA9:
            return x - 0xA2 + 's';
      case 0xC1 ... 0xC9:
            return x - 0xC1 + 'A';
      case 0xD1 ... 0xD9:
            return x - 0xD1 + 'J';
      case 0xE2 ... 0xE9:
            return x - 0xE2 + 'S';
      case 0xF0 ... 0xF9:
            return x - 0xF0 + '0';
      }
      return ' ';
}

static unsigned char * __init strne2a(unsigned char *dest,
            const unsigned char *src, size_t n)
{
      int i;

      n = strnlen(src, n);

      for (i = 0; i < n; i++)
            dest[i] = e2a(src[i]);

      return dest;
}

static struct iseries_flat_dt * __init dt_init(void)
{
      struct iseries_flat_dt *dt;
      unsigned long str_len;

      str_len = __dt_strings_end - __dt_strings_start;
      dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
      dt->header.off_mem_rsvmap =
            offsetof(struct iseries_flat_dt, reserve_map);
      dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
      dt->header.off_dt_struct = dt->header.off_dt_strings
            + ALIGN(str_len, 8);
      dt_data = (void *)((unsigned long)dt + dt->header.off_dt_struct);
      dt->header.dt_strings_size = str_len;

      /* There is no notion of hardware cpu id on iSeries */
      dt->header.boot_cpuid_phys = smp_processor_id();

      memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
                  str_len);

      dt->header.magic = OF_DT_HEADER;
      dt->header.version = 0x10;
      dt->header.last_comp_version = 0x10;

      dt->reserve_map[0] = 0;
      dt->reserve_map[1] = 0;

      return dt;
}

static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
{
      *((u32 *)dt_data) = value;
      dt_data += sizeof(u32);
}

#ifdef notyet
static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
{
      *((u64 *)dt_data) = value;
      dt_data += sizeof(u64);
}
#endif

static void __init dt_push_bytes(struct iseries_flat_dt *dt, const char *data,
            int len)
{
      memcpy(dt_data, data, len);
      dt_data += ALIGN(len, 4);
}

static void __init dt_start_node(struct iseries_flat_dt *dt, const char *name)
{
      dt_push_u32(dt, OF_DT_BEGIN_NODE);
      dt_push_bytes(dt, name, strlen(name) + 1);
}

#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)

static void __init dt_prop(struct iseries_flat_dt *dt, const char *name,
            const void *data, int len)
{
      unsigned long offset;

      dt_push_u32(dt, OF_DT_PROP);

      /* Length of the data */
      dt_push_u32(dt, len);

      offset = name - __dt_strings_start;

      /* The offset of the properties name in the string blob. */
      dt_push_u32(dt, (u32)offset);

      /* The actual data. */
      dt_push_bytes(dt, data, len);
}

static void __init dt_prop_str(struct iseries_flat_dt *dt, const char *name,
            const char *data)
{
      dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
}

static void __init dt_prop_u32(struct iseries_flat_dt *dt, const char *name,
            u32 data)
{
      dt_prop(dt, name, &data, sizeof(u32));
}

static void __init dt_prop_u64(struct iseries_flat_dt *dt, const char *name,
            u64 data)
{
      dt_prop(dt, name, &data, sizeof(u64));
}

static void __init dt_prop_u64_list(struct iseries_flat_dt *dt,
            const char *name, u64 *data, int n)
{
      dt_prop(dt, name, data, sizeof(u64) * n);
}

static void __init dt_prop_u32_list(struct iseries_flat_dt *dt,
            const char *name, u32 *data, int n)
{
      dt_prop(dt, name, data, sizeof(u32) * n);
}

#ifdef notyet
static void __init dt_prop_empty(struct iseries_flat_dt *dt, const char *name)
{
      dt_prop(dt, name, NULL, 0);
}
#endif

static void __init dt_cpus(struct iseries_flat_dt *dt)
{
      unsigned char buf[32];
      unsigned char *p;
      unsigned int i, index;
      struct IoHriProcessorVpd *d;
      u32 pft_size[2];

      /* yuck */
      snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
      p = strchr(buf, ' ');
      if (!p) p = buf + strlen(buf);

      dt_start_node(dt, "cpus");
      dt_prop_u32(dt, "#address-cells", 1);
      dt_prop_u32(dt, "#size-cells", 0);

      pft_size[0] = 0; /* NUMA CEC cookie, 0 for non NUMA  */
      pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);

      for (i = 0; i < NR_CPUS; i++) {
            if (lppaca[i].dyn_proc_status >= 2)
                  continue;

            snprintf(p, 32 - (p - buf), "@%d", i);
            dt_start_node(dt, buf);

            dt_prop_str(dt, "device_type", device_type_cpu);

            index = lppaca[i].dyn_hv_phys_proc_index;
            d = &xIoHriProcessorVpd[index];

            dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
            dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);

            dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
            dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);

            /* magic conversions to Hz copied from old code */
            dt_prop_u32(dt, "clock-frequency",
                  ((1UL << 34) * 1000000) / d->xProcFreq);
            dt_prop_u32(dt, "timebase-frequency",
                  ((1UL << 32) * 1000000) / d->xTimeBaseFreq);

            dt_prop_u32(dt, "reg", i);

            dt_prop_u32_list(dt, "ibm,pft-size", pft_size, 2);

            dt_end_node(dt);
      }

      dt_end_node(dt);
}

static void __init dt_model(struct iseries_flat_dt *dt)
{
      char buf[16] = "IBM,";

      /* N.B. lparcfg.c knows about the "IBM," prefixes ... */
      /* "IBM," + mfgId[2:3] + systemSerial[1:5] */
      strne2a(buf + 4, xItExtVpdPanel.mfgID + 2, 2);
      strne2a(buf + 6, xItExtVpdPanel.systemSerial + 1, 5);
      buf[11] = '\0';
      dt_prop_str(dt, "system-id", buf);

      /* "IBM," + machineType[0:4] */
      strne2a(buf + 4, xItExtVpdPanel.machineType, 4);
      buf[8] = '\0';
      dt_prop_str(dt, "model", buf);

      dt_prop_str(dt, "compatible", "IBM,iSeries");
      dt_prop_u32(dt, "ibm,partition-no", HvLpConfig_getLpIndex());
}

static void __init dt_initrd(struct iseries_flat_dt *dt)
{
#ifdef CONFIG_BLK_DEV_INITRD
      if (naca.xRamDisk) {
            dt_prop_u64(dt, "linux,initrd-start", (u64)naca.xRamDisk);
            dt_prop_u64(dt, "linux,initrd-end",
                  (u64)naca.xRamDisk + naca.xRamDiskSize * HW_PAGE_SIZE);
      }
#endif
}

static void __init dt_do_vdevice(struct iseries_flat_dt *dt,
            const char *name, u32 reg, int unit,
            const char *type, const char *compat, int end)
{
      char buf[32];

      snprintf(buf, 32, "%s@%08x", name, reg + ((unit >= 0) ? unit : 0));
      dt_start_node(dt, buf);
      dt_prop_str(dt, "device_type", type);
      if (compat)
            dt_prop_str(dt, "compatible", compat);
      dt_prop_u32(dt, "reg", reg + ((unit >= 0) ? unit : 0));
      if (unit >= 0)
            dt_prop_u32(dt, "linux,unit_address", unit);
      if (end)
            dt_end_node(dt);
}

static void __init dt_vdevices(struct iseries_flat_dt *dt)
{
      u32 reg = 0;
      HvLpIndexMap vlan_map;
      int i;

      dt_start_node(dt, "vdevice");
      dt_prop_str(dt, "device_type", device_type_vdevice);
      dt_prop_str(dt, "compatible", "IBM,iSeries-vdevice");
      dt_prop_u32(dt, "#address-cells", 1);
      dt_prop_u32(dt, "#size-cells", 0);

      dt_do_vdevice(dt, "vty", reg, -1, device_type_serial,
                  "IBM,iSeries-vty", 1);
      reg++;

      dt_do_vdevice(dt, "v-scsi", reg, -1, device_type_vscsi,
                  "IBM,v-scsi", 1);
      reg++;

      vlan_map = HvLpConfig_getVirtualLanIndexMap();
      for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
            unsigned char mac_addr[ETH_ALEN];

            if ((vlan_map & (0x8000 >> i)) == 0)
                  continue;
            dt_do_vdevice(dt, "l-lan", reg, i, device_type_network,
                        "IBM,iSeries-l-lan", 0);
            mac_addr[0] = 0x02;
            mac_addr[1] = 0x01;
            mac_addr[2] = 0xff;
            mac_addr[3] = i;
            mac_addr[4] = 0xff;
            mac_addr[5] = HvLpConfig_getLpIndex_outline();
            dt_prop(dt, "local-mac-address", (char *)mac_addr, ETH_ALEN);
            dt_prop(dt, "mac-address", (char *)mac_addr, ETH_ALEN);
            dt_prop_u32(dt, "max-frame-size", 9000);
            dt_prop_u32(dt, "address-bits", 48);

            dt_end_node(dt);
      }

      dt_end_node(dt);
}

00380 struct pci_class_name {
      u16 code;
      const char *name;
      const char *type;
};

static struct pci_class_name __initdata pci_class_name[] = {
      { PCI_CLASS_NETWORK_ETHERNET, "ethernet", device_type_network },
};

static struct pci_class_name * __init dt_find_pci_class_name(u16 class_code)
{
      struct pci_class_name *cp;

      for (cp = pci_class_name;
                  cp < &pci_class_name[ARRAY_SIZE(pci_class_name)]; cp++)
            if (cp->code == class_code)
                  return cp;
      return NULL;
}

/*
 * This assumes that the node slot is always on the primary bus!
 */
static void __init scan_bridge_slot(struct iseries_flat_dt *dt,
            HvBusNumber bus, struct HvCallPci_BridgeInfo *bridge_info)
{
      HvSubBusNumber sub_bus = bridge_info->subBusNumber;
      u16 vendor_id;
      u16 device_id;
      u32 class_id;
      int err;
      char buf[32];
      u32 reg[5];
      int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
      int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
      HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
      u8 devfn;
      struct pci_class_name *cp;

      /*
       * Connect all functions of any device found.
       */
      for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
            for (function = 0; function < 8; function++) {
                  HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
                              function);
                  err = HvCallXm_connectBusUnit(bus, sub_bus,
                              agent_id, 0);
                  if (err) {
                        if (err != 0x302)
                              DBG("connectBusUnit(%x, %x, %x) %x\n",
                                    bus, sub_bus, agent_id, err);
                        continue;
                  }

                  err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
                              PCI_VENDOR_ID, &vendor_id);
                  if (err) {
                        DBG("ReadVendor(%x, %x, %x) %x\n",
                              bus, sub_bus, agent_id, err);
                        continue;
                  }
                  err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
                              PCI_DEVICE_ID, &device_id);
                  if (err) {
                        DBG("ReadDevice(%x, %x, %x) %x\n",
                              bus, sub_bus, agent_id, err);
                        continue;
                  }
                  err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
                              PCI_CLASS_REVISION , &class_id);
                  if (err) {
                        DBG("ReadClass(%x, %x, %x) %x\n",
                              bus, sub_bus, agent_id, err);
                        continue;
                  }

                  devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
                              function);
                  cp = dt_find_pci_class_name(class_id >> 16);
                  if (cp && cp->name)
                        strncpy(buf, cp->name, sizeof(buf) - 1);
                  else
                        snprintf(buf, sizeof(buf), "pci%x,%x",
                                    vendor_id, device_id);
                  buf[sizeof(buf) - 1] = '\0';
                  snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                              "@%x", PCI_SLOT(devfn));
                  buf[sizeof(buf) - 1] = '\0';
                  if (function != 0)
                        snprintf(buf + strlen(buf),
                              sizeof(buf) - strlen(buf),
                              ",%x", function);
                  dt_start_node(dt, buf);
                  reg[0] = (bus << 16) | (devfn << 8);
                  reg[1] = 0;
                  reg[2] = 0;
                  reg[3] = 0;
                  reg[4] = 0;
                  dt_prop_u32_list(dt, "reg", reg, 5);
                  if (cp && (cp->type || cp->name))
                        dt_prop_str(dt, "device_type",
                              cp->type ? cp->type : cp->name);
                  dt_prop_u32(dt, "vendor-id", vendor_id);
                  dt_prop_u32(dt, "device-id", device_id);
                  dt_prop_u32(dt, "class-code", class_id >> 8);
                  dt_prop_u32(dt, "revision-id", class_id & 0xff);
                  dt_prop_u32(dt, "linux,subbus", sub_bus);
                  dt_prop_u32(dt, "linux,agent-id", agent_id);
                  dt_prop_u32(dt, "linux,logical-slot-number",
                              bridge_info->logicalSlotNumber);
                  dt_end_node(dt);

            }
      }
}

static void __init scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
            HvSubBusNumber sub_bus, int id_sel)
{
      struct HvCallPci_BridgeInfo bridge_info;
      HvAgentId agent_id;
      int function;
      int ret;

      /* Note: hvSubBus and irq is always be 0 at this level! */
      for (function = 0; function < 8; ++function) {
            agent_id = ISERIES_PCI_AGENTID(id_sel, function);
            ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
            if (ret != 0) {
                  if (ret != 0xb)
                        DBG("connectBusUnit(%x, %x, %x) %x\n",
                                    bus, sub_bus, agent_id, ret);
                  continue;
            }
            DBG("found device at bus %d idsel %d func %d (AgentId %x)\n",
                        bus, id_sel, function, agent_id);
            ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
                        iseries_hv_addr(&bridge_info),
                        sizeof(struct HvCallPci_BridgeInfo));
            if (ret != 0)
                  continue;
            DBG("bridge info: type %x subbus %x "
                  "maxAgents %x maxsubbus %x logslot %x\n",
                  bridge_info.busUnitInfo.deviceType,
                  bridge_info.subBusNumber,
                  bridge_info.maxAgents,
                  bridge_info.maxSubBusNumber,
                  bridge_info.logicalSlotNumber);
            if (bridge_info.busUnitInfo.deviceType ==
                        HvCallPci_BridgeDevice)
                  scan_bridge_slot(dt, bus, &bridge_info);
            else
                  DBG("PCI: Invalid Bridge Configuration(0x%02X)",
                        bridge_info.busUnitInfo.deviceType);
      }
}

static void __init scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
{
      struct HvCallPci_DeviceInfo dev_info;
      const HvSubBusNumber sub_bus = 0;   /* EADs is always 0. */
      int err;
      int id_sel;
      const int max_agents = 8;

      /*
       * Probe for EADs Bridges
       */
      for (id_sel = 1; id_sel < max_agents; ++id_sel) {
            err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
                        iseries_hv_addr(&dev_info),
                        sizeof(struct HvCallPci_DeviceInfo));
            if (err) {
                  if (err != 0x302)
                        DBG("getDeviceInfo(%x, %x, %x) %x\n",
                                    bus, sub_bus, id_sel, err);
                  continue;
            }
            if (dev_info.deviceType != HvCallPci_NodeDevice) {
                  DBG("PCI: Invalid System Configuration"
                              "(0x%02X) for bus 0x%02x id 0x%02x.\n",
                              dev_info.deviceType, bus, id_sel);
                  continue;
            }
            scan_bridge(dt, bus, sub_bus, id_sel);
      }
}

static void __init dt_pci_devices(struct iseries_flat_dt *dt)
{
      HvBusNumber bus;
      char buf[32];
      u32 buses[2];
      int phb_num = 0;

      /* Check all possible buses. */
      for (bus = 0; bus < 256; bus++) {
            int err = HvCallXm_testBus(bus);

            if (err) {
                  /*
                   * Check for Unexpected Return code, a clue that
                   * something has gone wrong.
                   */
                  if (err != 0x0301)
                        DBG("Unexpected Return on Probe(0x%02X) "
                                    "0x%04X\n", bus, err);
                  continue;
            }
            DBG("bus %d appears to exist\n", bus);
            snprintf(buf, 32, "pci@%d", phb_num);
            dt_start_node(dt, buf);
            dt_prop_str(dt, "device_type", device_type_pci);
            dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
            dt_prop_u32(dt, "#address-cells", 3);
            dt_prop_u32(dt, "#size-cells", 2);
            buses[0] = buses[1] = bus;
            dt_prop_u32_list(dt, "bus-range", buses, 2);
            scan_phb(dt, bus);
            dt_end_node(dt);
            phb_num++;
      }
}

static void dt_finish(struct iseries_flat_dt *dt)
{
      dt_push_u32(dt, OF_DT_END);
      dt->header.totalsize = (unsigned long)dt_data - (unsigned long)dt;
      klimit = ALIGN((unsigned long)dt_data, 8);
}

void * __init build_flat_dt(unsigned long phys_mem_size)
{
      struct iseries_flat_dt *iseries_dt;
      u64 tmp[2];

      iseries_dt = dt_init();

      dt_start_node(iseries_dt, "");

      dt_prop_u32(iseries_dt, "#address-cells", 2);
      dt_prop_u32(iseries_dt, "#size-cells", 2);
      dt_model(iseries_dt);

      /* /memory */
      dt_start_node(iseries_dt, "memory@0");
      dt_prop_str(iseries_dt, "device_type", device_type_memory);
      tmp[0] = 0;
      tmp[1] = phys_mem_size;
      dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
      dt_end_node(iseries_dt);

      /* /chosen */
      dt_start_node(iseries_dt, "chosen");
      dt_prop_str(iseries_dt, "bootargs", cmd_line);
      dt_initrd(iseries_dt);
      dt_end_node(iseries_dt);

      dt_cpus(iseries_dt);

      dt_vdevices(iseries_dt);
      dt_pci_devices(iseries_dt);

      dt_end_node(iseries_dt);

      dt_finish(iseries_dt);

      return iseries_dt;
}

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