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提交 7cf6c945 编写于 作者: D David Rientjes
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x86, apic: Remove support for IBM Summit/EXA chipset 

There should no longer be any IBM x440 systems or those using the
Summit/EXA chipset out in the wild, so remove support for it.

We've done our due diligence in reaching out to any contact information
listed for this chipset and no indication was given that it should be
kept around.
Signed-off-by: NDavid Rientjes <rientjes@google.com>
上级 58f5d2d4
隐藏空白更改
内联 并排
Showing with 9 addition and 693 deletion
arch/x86/Kconfig
浏览文件 @ 7cf6c945
......@@ -350,7 +350,6 @@ config X86_EXTENDED_PLATFORM
RDC R-321x SoC
SGI 320/540 (Visual Workstation)
STA2X11-based (e.g. Northville)
Summit/EXA (IBM x440)
Moorestown MID devices
If you have one of these systems, or if you want to build a
......@@ -488,10 +487,10 @@ config X86_32_NON_STANDARD
depends on X86_32 && SMP
depends on X86_EXTENDED_PLATFORM
---help---
This option compiles in the NUMAQ, Summit, bigsmp,
STA2X11, default subarchitectures. It is intended for a generic
binary kernel. If you select them all, kernel will probe it
one by one and will fallback to default.
This option compiles in the NUMAQ, bigsmp, and STA2X11 default
subarchitectures. It is intended for a generic binary kernel. If you
select them all, kernel will probe it one by one and will fallback to
default.
# Alphabetically sorted list of Non standard 32 bit platforms
......@@ -547,13 +546,6 @@ config STA2X11
option is selected the kernel will still be able to boot on
standard PC machines.
config X86_SUMMIT
bool "Summit/EXA (IBM x440)"
depends on X86_32_NON_STANDARD
---help---
This option is needed for IBM systems that use the Summit/EXA chipset.
In particular, it is needed for the x440.
config X86_32_IRIS
tristate "Eurobraille/Iris poweroff module"
depends on X86_32
......@@ -676,14 +668,6 @@ config MEMTEST
memtest=4, mean do 4 test patterns.
If you are unsure how to answer this question, answer N.
config X86_SUMMIT_NUMA
def_bool y
depends on X86_32 && NUMA && X86_32_NON_STANDARD
config X86_CYCLONE_TIMER
def_bool y
depends on X86_SUMMIT
source "arch/x86/Kconfig.cpu"
config HPET_TIMER
......@@ -812,7 +796,7 @@ config NR_CPUS
range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
default "1" if !SMP
default "8192" if MAXSMP
default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
default "32" if SMP && (X86_NUMAQ || X86_BIGSMP)
default "8" if SMP
---help---
This allows you to specify the maximum number of CPUs which this
......@@ -1232,8 +1216,8 @@ config DIRECT_GBPAGES
config NUMA
bool "Numa Memory Allocation and Scheduler Support"
depends on SMP
depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP))
default y if (X86_NUMAQ || X86_BIGSMP)
---help---
Enable NUMA (Non Uniform Memory Access) support.
......@@ -1245,14 +1229,11 @@ config NUMA
(or later), AMD Opteron, or EM64T NUMA.
For 32-bit this is only needed on (rare) 32-bit-only platforms
that support NUMA topologies, such as NUMAQ / Summit, or if you
boot a 32-bit kernel on a 64-bit NUMA platform.
that support NUMA topologies, such as NUMAQ, or if you boot a 32-bit
kernel on a 64-bit NUMA platform.
Otherwise, you should say N.
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
config AMD_NUMA
def_bool y
prompt "Old style AMD Opteron NUMA detection"
......
arch/x86/kernel/apic/Makefile
浏览文件 @ 7cf6c945
......@@ -19,7 +19,6 @@ endif
# APIC probe will depend on the listing order here
obj-$(CONFIG_X86_NUMAQ) += numaq_32.o
obj-$(CONFIG_X86_SUMMIT) += summit_32.o
obj-$(CONFIG_X86_BIGSMP) += bigsmp_32.o
# For 32bit, probe_32 need to be listed last
......
arch/x86/kernel/apic/summit_32.c 已删除 100644 → 0
浏览文件 @ 58f5d2d4
/*
* IBM Summit-Specific Code
*
* Written By: Matthew Dobson, IBM Corporation
*
* Copyright (c) 2003 IBM Corp.
*
* All rights reserved.
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Send feedback to <colpatch@us.ibm.com>
*
*/
#define pr_fmt(fmt) "summit: %s: " fmt, __func__
#include <linux/mm.h>
#include <asm/io.h>
#include <asm/bios_ebda.h>
/*
* APIC driver for the IBM "Summit" chipset.
*/
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <asm/mpspec.h>
#include <asm/apic.h>
#include <asm/smp.h>
#include <asm/fixmap.h>
#include <asm/apicdef.h>
#include <asm/ipi.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/smp.h>
static unsigned summit_get_apic_id(unsigned long x)
{
return (x >> 24) & 0xFF;
}
static inline void summit_send_IPI_mask(const struct cpumask *mask, int vector)
{
default_send_IPI_mask_sequence_logical(mask, vector);
}
static void summit_send_IPI_allbutself(int vector)
{
default_send_IPI_mask_allbutself_logical(cpu_online_mask, vector);
}
static void summit_send_IPI_all(int vector)
{
summit_send_IPI_mask(cpu_online_mask, vector);
}
#include <asm/tsc.h>
extern int use_cyclone;
#ifdef CONFIG_X86_SUMMIT_NUMA
static void setup_summit(void);
#else
static inline void setup_summit(void) {}
#endif
static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
char *productid)
{
if (!strncmp(oem, "IBM ENSW", 8) &&
(!strncmp(productid, "VIGIL SMP", 9)
|| !strncmp(productid, "EXA", 3)
|| !strncmp(productid, "RUTHLESS SMP", 12))){
mark_tsc_unstable("Summit based system");
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;
}
return 0;
}
/* Hook from generic ACPI tables.c */
static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
if (!strncmp(oem_id, "IBM", 3) &&
(!strncmp(oem_table_id, "SERVIGIL", 8)
|| !strncmp(oem_table_id, "EXA", 3))){
mark_tsc_unstable("Summit based system");
use_cyclone = 1; /*enable cyclone-timer*/
setup_summit();
return 1;
}
return 0;
}
struct rio_table_hdr {
unsigned char version; /* Version number of this data structure */
/* Version 3 adds chassis_num & WP_index */
unsigned char num_scal_dev; /* # of Scalability devices (Twisters for Vigil) */
unsigned char num_rio_dev; /* # of RIO I/O devices (Cyclones and Winnipegs) */
} __attribute__((packed));
struct scal_detail {
unsigned char node_id; /* Scalability Node ID */
unsigned long CBAR; /* Address of 1MB register space */
unsigned char port0node; /* Node ID port connected to: 0xFF=None */
unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
unsigned char port1node; /* Node ID port connected to: 0xFF = None */
unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
unsigned char port2node; /* Node ID port connected to: 0xFF = None */
unsigned char port2port; /* Port num port connected to: 0,1,2, or 0xFF=None */
unsigned char chassis_num; /* 1 based Chassis number (1 = boot node) */
} __attribute__((packed));
struct rio_detail {
unsigned char node_id; /* RIO Node ID */
unsigned long BBAR; /* Address of 1MB register space */
unsigned char type; /* Type of device */
unsigned char owner_id; /* For WPEG: Node ID of Cyclone that owns this WPEG*/
/* For CYC: Node ID of Twister that owns this CYC */
unsigned char port0node; /* Node ID port connected to: 0xFF=None */
unsigned char port0port; /* Port num port connected to: 0,1,2, or 0xFF=None */
unsigned char port1node; /* Node ID port connected to: 0xFF=None */
unsigned char port1port; /* Port num port connected to: 0,1,2, or 0xFF=None */
unsigned char first_slot; /* For WPEG: Lowest slot number below this WPEG */
/* For CYC: 0 */
unsigned char status; /* For WPEG: Bit 0 = 1 : the XAPIC is used */
/* = 0 : the XAPIC is not used, ie:*/
/* ints fwded to another XAPIC */
/* Bits1:7 Reserved */
/* For CYC: Bits0:7 Reserved */
unsigned char WP_index; /* For WPEG: WPEG instance index - lower ones have */
/* lower slot numbers/PCI bus numbers */
/* For CYC: No meaning */
unsigned char chassis_num; /* 1 based Chassis number */
/* For LookOut WPEGs this field indicates the */
/* Expansion Chassis #, enumerated from Boot */
/* Node WPEG external port, then Boot Node CYC */
/* external port, then Next Vigil chassis WPEG */
/* external port, etc. */
/* Shared Lookouts have only 1 chassis number (the */
/* first one assigned) */
} __attribute__((packed));
typedef enum {
CompatTwister = 0, /* Compatibility Twister */
AltTwister = 1, /* Alternate Twister of internal 8-way */
CompatCyclone = 2, /* Compatibility Cyclone */
AltCyclone = 3, /* Alternate Cyclone of internal 8-way */
CompatWPEG = 4, /* Compatibility WPEG */
AltWPEG = 5, /* Second Planar WPEG */
LookOutAWPEG = 6, /* LookOut WPEG */
LookOutBWPEG = 7, /* LookOut WPEG */
} node_type;
static inline int is_WPEG(struct rio_detail *rio){
return (rio->type == CompatWPEG || rio->type == AltWPEG ||
rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
}
#define SUMMIT_APIC_DFR_VALUE (APIC_DFR_CLUSTER)
static const struct cpumask *summit_target_cpus(void)
{
/* CPU_MASK_ALL (0xff) has undefined behaviour with
* dest_LowestPrio mode logical clustered apic interrupt routing
* Just start on cpu 0. IRQ balancing will spread load
*/
return cpumask_of(0);
}
static unsigned long summit_check_apicid_used(physid_mask_t *map, int apicid)
{
return 0;
}
/* we don't use the phys_cpu_present_map to indicate apicid presence */
static unsigned long summit_check_apicid_present(int bit)
{
return 1;
}
static int summit_early_logical_apicid(int cpu)
{
int count = 0;
u8 my_id = early_per_cpu(x86_cpu_to_apicid, cpu);
u8 my_cluster = APIC_CLUSTER(my_id);
#ifdef CONFIG_SMP
u8 lid;
int i;
/* Create logical APIC IDs by counting CPUs already in cluster. */
for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
lid = early_per_cpu(x86_cpu_to_logical_apicid, i);
if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
++count;
}
#endif
/* We only have a 4 wide bitmap in cluster mode. If a deranged
* BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
return my_cluster | (1UL << count);
}
static void summit_init_apic_ldr(void)
{
int cpu = smp_processor_id();
unsigned long id = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
unsigned long val;
apic_write(APIC_DFR, SUMMIT_APIC_DFR_VALUE);
val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
val |= SET_APIC_LOGICAL_ID(id);
apic_write(APIC_LDR, val);
}
static int summit_apic_id_registered(void)
{
return 1;
}
static void summit_setup_apic_routing(void)
{
pr_info("Enabling APIC mode: Summit. Using %d I/O APICs\n",
nr_ioapics);
}
static int summit_cpu_present_to_apicid(int mps_cpu)
{
if (mps_cpu < nr_cpu_ids)
return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
else
return BAD_APICID;
}
static void summit_ioapic_phys_id_map(physid_mask_t *phys_id_map, physid_mask_t *retmap)
{
/* For clustered we don't have a good way to do this yet - hack */
physids_promote(0x0FL, retmap);
}
static void summit_apicid_to_cpu_present(int apicid, physid_mask_t *retmap)
{
physid_set_mask_of_physid(0, retmap);
}
static int summit_check_phys_apicid_present(int physical_apicid)
{
return 1;
}
static inline int
summit_cpu_mask_to_apicid(const struct cpumask *cpumask, unsigned int *dest_id)
{
unsigned int round = 0;
unsigned int cpu, apicid = 0;
/*
* The cpus in the mask must all be on the apic cluster.
*/
for_each_cpu_and(cpu, cpumask, cpu_online_mask) {
int new_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
pr_err("Not a valid mask!\n");
return -EINVAL;
}
apicid |= new_apicid;
round++;
}
if (!round)
return -EINVAL;
*dest_id = apicid;
return 0;
}
static int
summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
const struct cpumask *andmask,
unsigned int *apicid)
{
cpumask_var_t cpumask;
*apicid = early_per_cpu(x86_cpu_to_logical_apicid, 0);
if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
return 0;
cpumask_and(cpumask, inmask, andmask);
summit_cpu_mask_to_apicid(cpumask, apicid);
free_cpumask_var(cpumask);
return 0;
}
/*
* cpuid returns the value latched in the HW at reset, not the APIC ID
* register's value. For any box whose BIOS changes APIC IDs, like
* clustered APIC systems, we must use hard_smp_processor_id.
*
* See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
*/
static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
{
return hard_smp_processor_id() >> index_msb;
}
static int probe_summit(void)
{
/* probed later in mptable/ACPI hooks */
return 0;
}
#ifdef CONFIG_X86_SUMMIT_NUMA
static struct rio_table_hdr *rio_table_hdr;
static struct scal_detail *scal_devs[MAX_NUMNODES];
static struct rio_detail *rio_devs[MAX_NUMNODES*4];
#ifndef CONFIG_X86_NUMAQ
static int mp_bus_id_to_node[MAX_MP_BUSSES];
#endif
static int setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
{
int twister = 0, node = 0;
int i, bus, num_buses;
for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
twister = rio_devs[i]->owner_id;
break;
}
}
if (i == rio_table_hdr->num_rio_dev) {
pr_err("Couldn't find owner Cyclone for Winnipeg!\n");
return last_bus;
}
for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
if (scal_devs[i]->node_id == twister) {
node = scal_devs[i]->node_id;
break;
}
}
if (i == rio_table_hdr->num_scal_dev) {
pr_err("Couldn't find owner Twister for Cyclone!\n");
return last_bus;
}
switch (rio_devs[wpeg_num]->type) {
case CompatWPEG:
/*
* The Compatibility Winnipeg controls the 2 legacy buses,
* the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
* a PCI-PCI bridge card is used in either slot: total 5 buses.
*/
num_buses = 5;
break;
case AltWPEG:
/*
* The Alternate Winnipeg controls the 2 133MHz buses [1 slot
* each], their 2 "extra" buses, the 100MHz bus [2 slots] and
* the "extra" buses for each of those slots: total 7 buses.
*/
num_buses = 7;
break;
case LookOutAWPEG:
case LookOutBWPEG:
/*
* A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
* & the "extra" buses for each of those slots: total 9 buses.
*/
num_buses = 9;
break;
default:
pr_info("Unsupported Winnipeg type!\n");
return last_bus;
}
for (bus = last_bus; bus < last_bus + num_buses; bus++)
mp_bus_id_to_node[bus] = node;
return bus;
}
static int build_detail_arrays(void)
{
unsigned long ptr;
int i, scal_detail_size, rio_detail_size;
if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
pr_warn("MAX_NUMNODES too low! Defined as %d, but system has %d nodes\n",
MAX_NUMNODES, rio_table_hdr->num_scal_dev);
return 0;
}
switch (rio_table_hdr->version) {
default:
pr_warn("Invalid Rio Grande Table Version: %d\n",
rio_table_hdr->version);
return 0;
case 2:
scal_detail_size = 11;
rio_detail_size = 13;
break;
case 3:
scal_detail_size = 12;
rio_detail_size = 15;
break;
}
ptr = (unsigned long)rio_table_hdr + 3;
for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
scal_devs[i] = (struct scal_detail *)ptr;
for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
rio_devs[i] = (struct rio_detail *)ptr;
return 1;
}
void setup_summit(void)
{
unsigned long ptr;
unsigned short offset;
int i, next_wpeg, next_bus = 0;
/* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
ptr = get_bios_ebda();
ptr = (unsigned long)phys_to_virt(ptr);
rio_table_hdr = NULL;
offset = 0x180;
while (offset) {
/* The block id is stored in the 2nd word */
if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
/* set the pointer past the offset & block id */
rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
break;
}
/* The next offset is stored in the 1st word. 0 means no more */
offset = *((unsigned short *)(ptr + offset));
}
if (!rio_table_hdr) {
pr_err("Unable to locate Rio Grande Table in EBDA - bailing!\n");
return;
}
if (!build_detail_arrays())
return;
/* The first Winnipeg we're looking for has an index of 0 */
next_wpeg = 0;
do {
for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
/* It's the Winnipeg we're looking for! */
next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
next_wpeg++;
break;
}
}
/*
* If we go through all Rio devices and don't find one with
* the next index, it means we've found all the Winnipegs,
* and thus all the PCI buses.
*/
if (i == rio_table_hdr->num_rio_dev)
next_wpeg = 0;
} while (next_wpeg != 0);
}
#endif
static struct apic apic_summit = {
.name = "summit",
.probe = probe_summit,
.acpi_madt_oem_check = summit_acpi_madt_oem_check,
.apic_id_valid = default_apic_id_valid,
.apic_id_registered = summit_apic_id_registered,
.irq_delivery_mode = dest_LowestPrio,
/* logical delivery broadcast to all CPUs: */
.irq_dest_mode = 1,
.target_cpus = summit_target_cpus,
.disable_esr = 1,
.dest_logical = APIC_DEST_LOGICAL,
.check_apicid_used = summit_check_apicid_used,
.check_apicid_present = summit_check_apicid_present,
.vector_allocation_domain = flat_vector_allocation_domain,
.init_apic_ldr = summit_init_apic_ldr,
.ioapic_phys_id_map = summit_ioapic_phys_id_map,
.setup_apic_routing = summit_setup_apic_routing,
.multi_timer_check = NULL,
.cpu_present_to_apicid = summit_cpu_present_to_apicid,
.apicid_to_cpu_present = summit_apicid_to_cpu_present,
.setup_portio_remap = NULL,
.check_phys_apicid_present = summit_check_phys_apicid_present,
.enable_apic_mode = NULL,
.phys_pkg_id = summit_phys_pkg_id,
.mps_oem_check = summit_mps_oem_check,
.get_apic_id = summit_get_apic_id,
.set_apic_id = NULL,
.apic_id_mask = 0xFF << 24,
.cpu_mask_to_apicid_and = summit_cpu_mask_to_apicid_and,
.send_IPI_mask = summit_send_IPI_mask,
.send_IPI_mask_allbutself = NULL,
.send_IPI_allbutself = summit_send_IPI_allbutself,
.send_IPI_all = summit_send_IPI_all,
.send_IPI_self = default_send_IPI_self,
.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
.wait_for_init_deassert = true,
.smp_callin_clear_local_apic = NULL,
.inquire_remote_apic = default_inquire_remote_apic,
.read = native_apic_mem_read,
.write = native_apic_mem_write,
.eoi_write = native_apic_mem_write,
.icr_read = native_apic_icr_read,
.icr_write = native_apic_icr_write,
.wait_icr_idle = native_apic_wait_icr_idle,
.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
.x86_32_early_logical_apicid = summit_early_logical_apicid,
};
apic_driver(apic_summit);
drivers/clocksource/Makefile
浏览文件 @ 7cf6c945
obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o
obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
obj-$(CONFIG_X86_CYCLONE_TIMER) += cyclone.o
obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
obj-$(CONFIG_SCx200HR_TIMER) += scx200_hrt.o
obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC) += cs5535-clockevt.o
......
drivers/clocksource/cyclone.c 已删除 100644 → 0
浏览文件 @ 58f5d2d4
#include <linux/clocksource.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/timex.h>
#include <linux/init.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/mach_timer.h>
#define CYCLONE_CBAR_ADDR 0xFEB00CD0 /* base address ptr */
#define CYCLONE_PMCC_OFFSET 0x51A0 /* offset to control register */
#define CYCLONE_MPCS_OFFSET 0x51A8 /* offset to select register */
#define CYCLONE_MPMC_OFFSET 0x51D0 /* offset to count register */
#define CYCLONE_TIMER_FREQ 99780000 /* 100Mhz, but not really */
#define CYCLONE_TIMER_MASK CLOCKSOURCE_MASK(32) /* 32 bit mask */
int use_cyclone = 0;
static void __iomem *cyclone_ptr;
static cycle_t read_cyclone(struct clocksource *cs)
{
return (cycle_t)readl(cyclone_ptr);
}
static struct clocksource clocksource_cyclone = {
.name = "cyclone",
.rating = 250,
.read = read_cyclone,
.mask = CYCLONE_TIMER_MASK,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static int __init init_cyclone_clocksource(void)
{
unsigned long base; /* saved value from CBAR */
unsigned long offset;
u32 __iomem* volatile cyclone_timer; /* Cyclone MPMC0 register */
u32 __iomem* reg;
int i;
/* make sure we're on a summit box: */
if (!use_cyclone)
return -ENODEV;
printk(KERN_INFO "Summit chipset: Starting Cyclone Counter.\n");
/* find base address: */
offset = CYCLONE_CBAR_ADDR;
reg = ioremap_nocache(offset, sizeof(reg));
if (!reg) {
printk(KERN_ERR "Summit chipset: Could not find valid CBAR register.\n");
return -ENODEV;
}
/* even on 64bit systems, this is only 32bits: */
base = readl(reg);
iounmap(reg);
if (!base) {
printk(KERN_ERR "Summit chipset: Could not find valid CBAR value.\n");
return -ENODEV;
}
/* setup PMCC: */
offset = base + CYCLONE_PMCC_OFFSET;
reg = ioremap_nocache(offset, sizeof(reg));
if (!reg) {
printk(KERN_ERR "Summit chipset: Could not find valid PMCC register.\n");
return -ENODEV;
}
writel(0x00000001,reg);
iounmap(reg);
/* setup MPCS: */
offset = base + CYCLONE_MPCS_OFFSET;
reg = ioremap_nocache(offset, sizeof(reg));
if (!reg) {
printk(KERN_ERR "Summit chipset: Could not find valid MPCS register.\n");
return -ENODEV;
}
writel(0x00000001,reg);
iounmap(reg);
/* map in cyclone_timer: */
offset = base + CYCLONE_MPMC_OFFSET;
cyclone_timer = ioremap_nocache(offset, sizeof(u64));
if (!cyclone_timer) {
printk(KERN_ERR "Summit chipset: Could not find valid MPMC register.\n");
return -ENODEV;
}
/* quick test to make sure its ticking: */
for (i = 0; i < 3; i++){
u32 old = readl(cyclone_timer);
int stall = 100;
while (stall--)
barrier();
if (readl(cyclone_timer) == old) {
printk(KERN_ERR "Summit chipset: Counter not counting! DISABLED\n");
iounmap(cyclone_timer);
cyclone_timer = NULL;
return -ENODEV;
}
}
cyclone_ptr = cyclone_timer;
return clocksource_register_hz(&clocksource_cyclone,
CYCLONE_TIMER_FREQ);
}
arch_initcall(init_cyclone_clocksource);
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