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Merge branch 'cpu_of_node' of git://linux-arm.org/linux-skn into pm-cpufreq-next

Browse Source 
Pull DT/core/cpufreq cpu_ofnode updates for v3.12 from Sudeep KarkadaNagesha.

* 'cpu_of_node' of git://linux-arm.org/linux-skn:
  cpufreq: pmac32-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: pmac64-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: maple-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: arm_big_little: remove device tree parsing for cpu nodes
  cpufreq: kirkwood-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: spear-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: highbank-cpufreq: remove device tree parsing for cpu nodes
  cpufreq: cpufreq-cpu0: remove device tree parsing for cpu nodes
  cpufreq: imx6q-cpufreq: remove device tree parsing for cpu nodes
  drivers/bus: arm-cci: avoid parsing DT for cpu device nodes
  ARM: mvebu: remove device tree parsing for cpu nodes
  ARM: topology: remove hwid/MPIDR dependency from cpu_capacity
  of/device: add helper to get cpu device node from logical cpu index
  driver/core: cpu: initialize of_node in cpu's device struture
  ARM: DT/kernel: define ARM specific arch_match_cpu_phys_id
  of: move of_get_cpu_node implementation to DT core library
  powerpc: refactor of_get_cpu_node to support other architectures
  openrisc: remove undefined of_get_cpu_node declaration
  microblaze: remove undefined of_get_cpu_node declaration
This commit is contained in:
Rafael J. Wysocki 2013-08-23 00:57:19 +02:00
commit 09198f8fef
23 changed files with 226 additions and 266 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm/kernel/devtree.c
View File

@ -169,6 +169,11 @@ void __init arm_dt_init_cpu_maps(void)
}
}
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return (phys_id & MPIDR_HWID_BITMASK) == cpu_logical_map(cpu);
}
/**
* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
* @dt_phys: physical address of dt blob

61
arch/arm/kernel/topology.c
View File

@ -74,12 +74,8 @@ struct cpu_efficiency table_efficiency[] = {
{NULL, },
};
struct cpu_capacity {
unsigned long hwid;
unsigned long capacity;
};
struct cpu_capacity *cpu_capacity;
unsigned long *__cpu_capacity;
#define cpu_capacity(cpu) __cpu_capacity[cpu]
unsigned long middle_capacity = 1;
@ -100,15 +96,19 @@ static void __init parse_dt_topology(void)
unsigned long capacity = 0;
int alloc_size, cpu = 0;
alloc_size = nr_cpu_ids * sizeof(struct cpu_capacity);
cpu_capacity = kzalloc(alloc_size, GFP_NOWAIT);
alloc_size = nr_cpu_ids * sizeof(*__cpu_capacity);
__cpu_capacity = kzalloc(alloc_size, GFP_NOWAIT);
while ((cn = of_find_node_by_type(cn, "cpu"))) {
const u32 *rate, *reg;
for_each_possible_cpu(cpu) {
const u32 *rate;
int len;
if (cpu >= num_possible_cpus())
break;
/* too early to use cpu->of_node */
cn = of_get_cpu_node(cpu, NULL);
if (!cn) {
pr_err("missing device node for CPU %d\n", cpu);
continue;
}
for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
if (of_device_is_compatible(cn, cpu_eff->compatible))
@ -124,12 +124,6 @@ static void __init parse_dt_topology(void)
continue;
}
reg = of_get_property(cn, "reg", &len);
if (!reg || len != 4) {
pr_err("%s missing reg property\n", cn->full_name);
continue;
}
capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
/* Save min capacity of the system */
@ -140,13 +134,9 @@ static void __init parse_dt_topology(void)
if (capacity > max_capacity)
max_capacity = capacity;
cpu_capacity[cpu].capacity = capacity;
cpu_capacity[cpu++].hwid = be32_to_cpup(reg);
cpu_capacity(cpu) = capacity;
}
if (cpu < num_possible_cpus())
cpu_capacity[cpu].hwid = (unsigned long)(-1);
/* If min and max capacities are equals, we bypass the update of the
* cpu_scale because all CPUs have the same capacity. Otherwise, we
* compute a middle_capacity factor that will ensure that the capacity
@ -154,9 +144,7 @@ static void __init parse_dt_topology(void)
* SCHED_POWER_SCALE, which is the default value, but with the
* constraint explained near table_efficiency[].
*/
if (min_capacity == max_capacity)
cpu_capacity[0].hwid = (unsigned long)(-1);
else if (4*max_capacity < (3*(max_capacity + min_capacity)))
if (4*max_capacity < (3*(max_capacity + min_capacity)))
middle_capacity = (min_capacity + max_capacity)
>> (SCHED_POWER_SHIFT+1);
else
@ -170,23 +158,12 @@ static void __init parse_dt_topology(void)
* boot. The update of all CPUs is in O(n^2) for heteregeneous system but the
* function returns directly for SMP system.
*/
void update_cpu_power(unsigned int cpu, unsigned long hwid)
void update_cpu_power(unsigned int cpu)
{
unsigned int idx = 0;
/* look for the cpu's hwid in the cpu capacity table */
for (idx = 0; idx < num_possible_cpus(); idx++) {
if (cpu_capacity[idx].hwid == hwid)
break;
if (cpu_capacity[idx].hwid == -1)
return;
}
if (idx == num_possible_cpus())
if (!cpu_capacity(cpu))
return;
set_power_scale(cpu, cpu_capacity[idx].capacity / middle_capacity);
set_power_scale(cpu, cpu_capacity(cpu) / middle_capacity);
printk(KERN_INFO "CPU%u: update cpu_power %lu\n",
cpu, arch_scale_freq_power(NULL, cpu));
@ -194,7 +171,7 @@ void update_cpu_power(unsigned int cpu, unsigned long hwid)
#else
static inline void parse_dt_topology(void) {}
static inline void update_cpu_power(unsigned int cpuid, unsigned int mpidr) {}
static inline void update_cpu_power(unsigned int cpuid) {}
#endif
/*
@ -281,7 +258,7 @@ void store_cpu_topology(unsigned int cpuid)
update_siblings_masks(cpuid);
update_cpu_power(cpuid, mpidr & MPIDR_HWID_BITMASK);
update_cpu_power(cpuid);
printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,

3
arch/arm/mach-imx/mach-imx6q.c
View File

@ -254,13 +254,12 @@ static void __init imx6q_opp_init(struct device *cpu_dev)
{
struct device_node *np;
np = of_find_node_by_path("/cpus/cpu@0");
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_warn("failed to find cpu0 node\n");
return;
}
cpu_dev->of_node = np;
if (of_init_opp_table(cpu_dev)) {
pr_warn("failed to init OPP table\n");
goto put_node;

49
arch/arm/mach-mvebu/platsmp.c
View File

@ -29,46 +29,41 @@
#include "pmsu.h"
#include "coherency.h"
static struct clk *__init get_cpu_clk(int cpu)
{
struct clk *cpu_clk;
struct device_node *np = of_get_cpu_node(cpu, NULL);
if (WARN(!np, "missing cpu node\n"))
return NULL;
cpu_clk = of_clk_get(np, 0);
if (WARN_ON(IS_ERR(cpu_clk)))
return NULL;
return cpu_clk;
}
void __init set_secondary_cpus_clock(void)
{
int thiscpu;
int thiscpu, cpu;
unsigned long rate;
struct clk *cpu_clk = NULL;
struct device_node *np = NULL;
struct clk *cpu_clk;
thiscpu = smp_processor_id();
for_each_node_by_type(np, "cpu") {
int err;
int cpu;
err = of_property_read_u32(np, "reg", &cpu);
if (WARN_ON(err))
return;
if (cpu == thiscpu) {
cpu_clk = of_clk_get(np, 0);
break;
}
}
if (WARN_ON(IS_ERR(cpu_clk)))
cpu_clk = get_cpu_clk(thiscpu);
if (!cpu_clk)
return;
clk_prepare_enable(cpu_clk);
rate = clk_get_rate(cpu_clk);
/* set all the other CPU clk to the same rate than the boot CPU */
for_each_node_by_type(np, "cpu") {
int err;
int cpu;
err = of_property_read_u32(np, "reg", &cpu);
if (WARN_ON(err))
for_each_possible_cpu(cpu) {
if (cpu == thiscpu)
continue;
cpu_clk = get_cpu_clk(cpu);
if (!cpu_clk)
return;
if (cpu != thiscpu) {
cpu_clk = of_clk_get(np, 0);
clk_set_rate(cpu_clk, rate);
}
}
}
static void armada_xp_secondary_init(unsigned int cpu)

3
arch/microblaze/include/asm/prom.h
View File

@ -50,9 +50,6 @@ void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
extern void kdump_move_device_tree(void);
/* CPU OF node matching */
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */

3
arch/openrisc/include/asm/prom.h
View File

@ -44,9 +44,6 @@ void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
extern void kdump_move_device_tree(void);
/* CPU OF node matching */
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
/* Get the MAC address */
extern const void *of_get_mac_address(struct device_node *np);

3
arch/powerpc/include/asm/prom.h
View File

@ -43,9 +43,6 @@ void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
extern void kdump_move_device_tree(void);
/* CPU OF node matching */
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
/* cache lookup */
struct device_node *of_find_next_cache_node(struct device_node *np);

43
arch/powerpc/kernel/prom.c
View File

@ -865,49 +865,10 @@ static int __init prom_reconfig_setup(void)
__initcall(prom_reconfig_setup);
#endif
/* Find the device node for a given logical cpu number, also returns the cpu
* local thread number (index in ibm,interrupt-server#s) if relevant and
* asked for (non NULL)
*/
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
int hardid;
struct device_node *np;
hardid = get_hard_smp_processor_id(cpu);
for_each_node_by_type(np, "cpu") {
const u32 *intserv;
unsigned int plen, t;
/* Check for ibm,ppc-interrupt-server#s. If it doesn't exist
* fallback to "reg" property and assume no threads
*/
intserv = of_get_property(np, "ibm,ppc-interrupt-server#s",
&plen);
if (intserv == NULL) {
const u32 *reg = of_get_property(np, "reg", NULL);
if (reg == NULL)
continue;
if (*reg == hardid) {
if (thread)
*thread = 0;
return np;
}
} else {
plen /= sizeof(u32);
for (t = 0; t < plen; t++) {
if (hardid == intserv[t]) {
if (thread)
*thread = t;
return np;
}
}
}
}
return NULL;
return (int)phys_id == get_hard_smp_processor_id(cpu);
}
EXPORT_SYMBOL(of_get_cpu_node);
#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
static struct debugfs_blob_wrapper flat_dt_blob;

2
drivers/base/cpu.c
View File

@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/percpu.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include "base.h"
@ -289,6 +290,7 @@ int register_cpu(struct cpu *cpu, int num)
cpu->dev.release = cpu_device_release;
cpu->dev.offline_disabled = !cpu->hotpluggable;
cpu->dev.offline = !cpu_online(num);
cpu->dev.of_node = of_get_cpu_node(num, NULL);
#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
cpu->dev.bus->uevent = arch_cpu_uevent;
#endif

28
drivers/bus/arm-cci.c
View File

@ -122,17 +122,8 @@ EXPORT_SYMBOL_GPL(cci_ace_get_port);
static void __init cci_ace_init_ports(void)
{
int port, ac, cpu;
u64 hwid;
const u32 *cell;
struct device_node *cpun, *cpus;
cpus = of_find_node_by_path("/cpus");
if (WARN(!cpus, "Missing cpus node, bailing out\n"))
return;
if (WARN_ON(of_property_read_u32(cpus, "#address-cells", &ac)))
ac = of_n_addr_cells(cpus);
int port, cpu;
struct device_node *cpun;
/*
* Port index look-up speeds up the function disabling ports by CPU,
@ -141,18 +132,13 @@ static void __init cci_ace_init_ports(void)
* The stashed index array is initialized for all possible CPUs
* at probe time.
*/
for_each_child_of_node(cpus, cpun) {
if (of_node_cmp(cpun->type, "cpu"))
continue;
cell = of_get_property(cpun, "reg", NULL);
if (WARN(!cell, "%s: missing reg property\n", cpun->full_name))
for_each_possible_cpu(cpu) {
/* too early to use cpu->of_node */
cpun = of_get_cpu_node(cpu, NULL);
if (WARN(!cpun, "Missing cpu device node\n"))
continue;
hwid = of_read_number(cell, ac);
cpu = get_logical_index(hwid & MPIDR_HWID_BITMASK);
if (cpu < 0 || !cpu_possible(cpu))
continue;
port = __cci_ace_get_port(cpun, ACE_PORT);
if (port < 0)
continue;

34
drivers/cpufreq/arm_big_little_dt.c
View File

@ -19,12 +19,11 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/opp.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@ -34,27 +33,13 @@
/* get cpu node with valid operating-points */
static struct device_node *get_cpu_node_with_valid_op(int cpu)
{
struct device_node *np = NULL, *parent;
int count = 0;
struct device_node *np = of_cpu_device_node_get(cpu);
parent = of_find_node_by_path("/cpus");
if (!parent) {
pr_err("failed to find OF /cpus\n");
return NULL;
}
for_each_child_of_node(parent, np) {
if (count++ != cpu)
continue;
if (!of_get_property(np, "operating-points", NULL)) {
of_node_put(np);
np = NULL;
}
break;
}
of_node_put(parent);
return np;
}
@ -63,11 +48,12 @@ static int dt_init_opp_table(struct device *cpu_dev)
struct device_node *np;
int ret;
np = get_cpu_node_with_valid_op(cpu_dev->id);
if (!np)
return -ENODATA;
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_err("failed to find cpu%d node\n", cpu_dev->id);
return -ENOENT;
}
cpu_dev->of_node = np;
ret = of_init_opp_table(cpu_dev);
of_node_put(np);
@ -79,9 +65,11 @@ static int dt_get_transition_latency(struct device *cpu_dev)
struct device_node *np;
u32 transition_latency = CPUFREQ_ETERNAL;
np = get_cpu_node_with_valid_op(cpu_dev->id);
if (!np)
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_info("Failed to find cpu node. Use CPUFREQ_ETERNAL transition latency\n");
return CPUFREQ_ETERNAL;
}
of_property_read_u32(np, "clock-latency", &transition_latency);
of_node_put(np);

23
drivers/cpufreq/cpufreq-cpu0.c
View File

@ -174,29 +174,17 @@ static struct cpufreq_driver cpu0_cpufreq_driver = {
static int cpu0_cpufreq_probe(struct platform_device *pdev)
{
struct device_node *np, *parent;
struct device_node *np;
int ret;
parent = of_find_node_by_path("/cpus");
if (!parent) {
pr_err("failed to find OF /cpus\n");
return -ENOENT;
}
for_each_child_of_node(parent, np) {
if (of_get_property(np, "operating-points", NULL))
break;
}
cpu_dev = &pdev->dev;
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_err("failed to find cpu0 node\n");
ret = -ENOENT;
goto out_put_parent;
return -ENOENT;
}
cpu_dev = &pdev->dev;
cpu_dev->of_node = np;
cpu_reg = devm_regulator_get(cpu_dev, "cpu0");
if (IS_ERR(cpu_reg)) {
/*
@ -268,15 +256,12 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
}
of_node_put(np);
of_node_put(parent);
return 0;
out_free_table:
opp_free_cpufreq_table(cpu_dev, &freq_table);
out_put_node:
of_node_put(np);
out_put_parent:
of_node_put(parent);
return ret;
}

18
drivers/cpufreq/highbank-cpufreq.c
View File

@ -69,24 +69,18 @@ static int hb_cpufreq_driver_init(void)
if (!of_machine_is_compatible("calxeda,highbank"))
return -ENODEV;
for_each_child_of_node(of_find_node_by_path("/cpus"), np)
if (of_get_property(np, "operating-points", NULL))
break;
cpu_dev = get_cpu_device(0);
if (!cpu_dev) {
pr_err("failed to get highbank cpufreq device\n");
return -ENODEV;
}
np = of_node_get(cpu_dev->of_node);
if (!np) {
pr_err("failed to find highbank cpufreq node\n");
return -ENOENT;
}
cpu_dev = get_cpu_device(0);
if (!cpu_dev) {
pr_err("failed to get highbank cpufreq device\n");
ret = -ENODEV;
goto out_put_node;
}
cpu_dev->of_node = np;
cpu_clk = clk_get(cpu_dev, NULL);
if (IS_ERR(cpu_clk)) {
ret = PTR_ERR(cpu_clk);

4
drivers/cpufreq/imx6q-cpufreq.c
View File

@ -221,14 +221,12 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
cpu_dev = &pdev->dev;
np = of_find_node_by_path("/cpus/cpu@0");
np = of_node_get(cpu_dev->of_node);
if (!np) {
dev_err(cpu_dev, "failed to find cpu0 node\n");
return -ENOENT;
}
cpu_dev->of_node = np;
arm_clk = devm_clk_get(cpu_dev, "arm");
pll1_sys_clk = devm_clk_get(cpu_dev, "pll1_sys");
pll1_sw_clk = devm_clk_get(cpu_dev, "pll1_sw");

8
drivers/cpufreq/kirkwood-cpufreq.c
View File

@ -14,7 +14,7 @@
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/cpufreq.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/proc-fns.h>
@ -174,9 +174,11 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
if (IS_ERR(priv.base))
return PTR_ERR(priv.base);
np = of_find_node_by_path("/cpus/cpu@0");
if (!np)
np = of_cpu_device_node_get(0);
if (!np) {
dev_err(&pdev->dev, "failed to get cpu device node\n");
return -ENODEV;
}
priv.cpu_clk = of_clk_get_by_name(np, "cpu_clk");
if (IS_ERR(priv.cpu_clk)) {

23
drivers/cpufreq/maple-cpufreq.c
View File

@ -24,7 +24,7 @@
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/time.h>
#include <linux/of.h>
#include <linux/of_device.h>
#define DBG(fmt...) pr_debug(fmt)
@ -200,7 +200,6 @@ static struct cpufreq_driver maple_cpufreq_driver = {
static int __init maple_cpufreq_init(void)
{
struct device_node *cpus;
struct device_node *cpunode;
unsigned int psize;
unsigned long max_freq;
@ -216,24 +215,11 @@ static int __init maple_cpufreq_init(void)
!of_machine_is_compatible("Momentum,Apache"))
return 0;
cpus = of_find_node_by_path("/cpus");
if (cpus == NULL) {
DBG("No /cpus node !\n");
return -ENODEV;
}
/* Get first CPU node */
for (cpunode = NULL;
(cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
const u32 *reg = of_get_property(cpunode, "reg", NULL);
if (reg == NULL || (*reg) != 0)
continue;
if (!strcmp(cpunode->type, "cpu"))
break;
}
cpunode = of_cpu_device_node_get(0);
if (cpunode == NULL) {
printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n");
goto bail_cpus;
goto bail_noprops;
}
/* Check 970FX for now */
@ -289,14 +275,11 @@ static int __init maple_cpufreq_init(void)
rc = cpufreq_register_driver(&maple_cpufreq_driver);
of_node_put(cpunode);
of_node_put(cpus);
return rc;
bail_noprops:
of_node_put(cpunode);
bail_cpus:
of_node_put(cpus);
return rc;
}

5
drivers/cpufreq/pmac32-cpufreq.c
View File

@ -25,6 +25,7 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/hardirq.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/irq.h>
@ -648,8 +649,8 @@ static int __init pmac_cpufreq_setup(void)
if (strstr(cmd_line, "nocpufreq"))
return 0;
/* Assume only one CPU */
cpunode = of_find_node_by_type(NULL, "cpu");
/* Get first CPU node */
cpunode = of_cpu_device_node_get(0);
if (!cpunode)
goto out;

47
drivers/cpufreq/pmac64-cpufreq.c
View File

@ -22,6 +22,7 @@
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/irq.h>
@ -382,9 +383,8 @@ static struct cpufreq_driver g5_cpufreq_driver = {
#ifdef CONFIG_PMAC_SMU
static int __init g5_neo2_cpufreq_init(struct device_node *cpus)
static int __init g5_neo2_cpufreq_init(struct device_node *cpunode)
{
struct device_node *cpunode;
unsigned int psize, ssize;
unsigned long max_freq;
char *freq_method, *volt_method;
@ -404,20 +404,6 @@ static int __init g5_neo2_cpufreq_init(struct device_node *cpus)
else
return -ENODEV;
/* Get first CPU node */
for (cpunode = NULL;
(cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
const u32 *reg = of_get_property(cpunode, "reg", NULL);
if (reg == NULL || (*reg) != 0)
continue;
if (!strcmp(cpunode->type, "cpu"))
break;
}
if (cpunode == NULL) {
printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n");
return -ENODEV;
}
/* Check 970FX for now */
valp = of_get_property(cpunode, "cpu-version", NULL);
if (!valp) {
@ -535,9 +521,9 @@ static int __init g5_neo2_cpufreq_init(struct device_node *cpus)
#endif /* CONFIG_PMAC_SMU */
static int __init g5_pm72_cpufreq_init(struct device_node *cpus)
static int __init g5_pm72_cpufreq_init(struct device_node *cpunode)
{
struct device_node *cpuid = NULL, *hwclock = NULL, *cpunode = NULL;
struct device_node *cpuid = NULL, *hwclock = NULL;
const u8 *eeprom = NULL;
const u32 *valp;
u64 max_freq, min_freq, ih, il;
@ -546,17 +532,6 @@ static int __init g5_pm72_cpufreq_init(struct device_node *cpus)
DBG("cpufreq: Initializing for PowerMac7,2, PowerMac7,3 and"
" RackMac3,1...\n");
/* Get first CPU node */
for (cpunode = NULL;
(cpunode = of_get_next_child(cpus, cpunode)) != NULL;) {
if (!strcmp(cpunode->type, "cpu"))
break;
}
if (cpunode == NULL) {
printk(KERN_ERR "cpufreq: Can't find any CPU node\n");
return -ENODEV;
}
/* Lookup the cpuid eeprom node */
cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0");
if (cpuid != NULL)
@ -716,25 +691,25 @@ static int __init g5_pm72_cpufreq_init(struct device_node *cpus)
static int __init g5_cpufreq_init(void)
{
struct device_node *cpus;
struct device_node *cpunode;
int rc = 0;
cpus = of_find_node_by_path("/cpus");
if (cpus == NULL) {
DBG("No /cpus node !\n");
/* Get first CPU node */
cpunode = of_cpu_device_node_get(0);
if (cpunode == NULL) {
pr_err("cpufreq: Can't find any CPU node\n");
return -ENODEV;
}
if (of_machine_is_compatible("PowerMac7,2") ||
of_machine_is_compatible("PowerMac7,3") ||
of_machine_is_compatible("RackMac3,1"))
rc = g5_pm72_cpufreq_init(cpus);
rc = g5_pm72_cpufreq_init(cpunode);
#ifdef CONFIG_PMAC_SMU
else
rc = g5_neo2_cpufreq_init(cpus);
rc = g5_neo2_cpufreq_init(cpunode);
#endif /* CONFIG_PMAC_SMU */
of_node_put(cpus);
return rc;
}

4
drivers/cpufreq/spear-cpufreq.c
View File

@ -18,7 +18,7 @@
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/types.h>
@ -223,7 +223,7 @@ static int spear_cpufreq_driver_init(void)
const __be32 *val;
int cnt, i, ret;
np = of_find_node_by_path("/cpus/cpu@0");
np = of_cpu_device_node_get(0);
if (!np) {
pr_err("No cpu node found");
return -ENODEV;

95
drivers/of/base.c
View File

@ -18,6 +18,7 @@
* 2 of the License, or (at your option) any later version.
*/
#include <linux/ctype.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/spinlock.h>
@ -230,6 +231,100 @@ const void *of_get_property(const struct device_node *np, const char *name,
}
EXPORT_SYMBOL(of_get_property);
/*
* arch_match_cpu_phys_id - Match the given logical CPU and physical id
*
* @cpu: logical cpu index of a core/thread
* @phys_id: physical identifier of a core/thread
*
* CPU logical to physical index mapping is architecture specific.
* However this __weak function provides a default match of physical
* id to logical cpu index. phys_id provided here is usually values read
* from the device tree which must match the hardware internal registers.
*
* Returns true if the physical identifier and the logical cpu index
* correspond to the same core/thread, false otherwise.
*/
bool __weak arch_match_cpu_phys_id(int cpu, u64 phys_id)
{
return (u32)phys_id == cpu;
}
/**
* Checks if the given "prop_name" property holds the physical id of the
* core/thread corresponding to the logical cpu 'cpu'. If 'thread' is not
* NULL, local thread number within the core is returned in it.
*/
static bool __of_find_n_match_cpu_property(struct device_node *cpun,
const char *prop_name, int cpu, unsigned int *thread)
{
const __be32 *cell;
int ac, prop_len, tid;
u64 hwid;
ac = of_n_addr_cells(cpun);
cell = of_get_property(cpun, prop_name, &prop_len);
if (!cell)
return false;
prop_len /= sizeof(*cell);
for (tid = 0; tid < prop_len; tid++) {
hwid = of_read_number(cell, ac);
if (arch_match_cpu_phys_id(cpu, hwid)) {
if (thread)
*thread = tid;
return true;
}
cell += ac;
}
return false;
}
/**
* of_get_cpu_node - Get device node associated with the given logical CPU
*
* @cpu: CPU number(logical index) for which device node is required
* @thread: if not NULL, local thread number within the physical core is
* returned
*
* The main purpose of this function is to retrieve the device node for the
* given logical CPU index. It should be used to initialize the of_node in
* cpu device. Once of_node in cpu device is populated, all the further
* references can use that instead.
*
* CPU logical to physical index mapping is architecture specific and is built
* before booting secondary cores. This function uses arch_match_cpu_phys_id
* which can be overridden by architecture specific implementation.
*
* Returns a node pointer for the logical cpu if found, else NULL.
*/
struct device_node *of_get_cpu_node(int cpu, unsigned int *thread)
{
struct device_node *cpun, *cpus;
cpus = of_find_node_by_path("/cpus");
if (!cpus) {
pr_warn("Missing cpus node, bailing out\n");
return NULL;
}
for_each_child_of_node(cpus, cpun) {
if (of_node_cmp(cpun->type, "cpu"))
continue;
/* Check for non-standard "ibm,ppc-interrupt-server#s" property
* for thread ids on PowerPC. If it doesn't exist fallback to
* standard "reg" property.
*/
if (IS_ENABLED(CONFIG_PPC) &&
__of_find_n_match_cpu_property(cpun,
"ibm,ppc-interrupt-server#s", cpu, thread))
return cpun;
if (__of_find_n_match_cpu_property(cpun, "reg", cpu, thread))
return cpun;
}
return NULL;
}
EXPORT_SYMBOL(of_get_cpu_node);
/** Checks if the given "compat" string matches one of the strings in
* the device's "compatible" property
*/

1
include/linux/cpu.h
View File

@ -28,6 +28,7 @@ struct cpu {
extern int register_cpu(struct cpu *cpu, int num);
extern struct device *get_cpu_device(unsigned cpu);
extern bool cpu_is_hotpluggable(unsigned cpu);
extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
extern int cpu_add_dev_attr(struct device_attribute *attr);
extern void cpu_remove_dev_attr(struct device_attribute *attr);

7
include/linux/of.h
View File

@ -266,6 +266,7 @@ extern int of_device_is_available(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
const char *name,
int *lenp);
extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
#define for_each_property_of_node(dn, pp) \
for (pp = dn->properties; pp != NULL; pp = pp->next)
@ -459,6 +460,12 @@ static inline const void *of_get_property(const struct device_node *node,
return NULL;
}
static inline struct device_node *of_get_cpu_node(int cpu,
unsigned int *thread)
{
return NULL;
}
static inline int of_property_read_u64(const struct device_node *np,
const char *propname, u64 *out_value)
{

15
include/linux/of_device.h
View File

@ -1,6 +1,7 @@
#ifndef _LINUX_OF_DEVICE_H
#define _LINUX_OF_DEVICE_H
#include <linux/cpu.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h> /* temporary until merge */
@ -43,6 +44,15 @@ static inline void of_device_node_put(struct device *dev)
of_node_put(dev->of_node);
}
static inline struct device_node *of_cpu_device_node_get(int cpu)
{
struct device *cpu_dev;
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev)
return NULL;
return of_node_get(cpu_dev->of_node);
}
#else /* CONFIG_OF */
static inline int of_driver_match_device(struct device *dev,
@ -67,6 +77,11 @@ static inline const struct of_device_id *of_match_device(
{
return NULL;
}
static inline struct device_node *of_cpu_device_node_get(int cpu)
{
return NULL;
}
#endif /* CONFIG_OF */
#endif /* _LINUX_OF_DEVICE_H */