dt.c

linux内核源码

/*
 *    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[];

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)