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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <mach/mt_hotplug_strategy.h>
#include <mach/mt_spm_mtcmos.h>
#include <mach/mt_secure_api.h>
#include "l2c_share.h"
static struct device_driver mt_l2c_drv =
{
.name = "l2c_share",
.bus = &platform_bus_type,
.owner = THIS_MODULE,
};
static char *log[] = {
"borrow L2$",
"return L2$",
"wrong option"
};
void __iomem *mp0_cache_config;
void __iomem *mp1_cache_config;
l2c_share_info g_l2c_share_info;
int is_l2_borrowed;
int IS_L2_BORROWED(void)
{
return is_l2_borrowed;
}
static int enable_secondary_clusters_pwr(void)
{
int err = 0;
if(g_l2c_share_info.share_cluster_num == 1)
{
pr_notice("L2$ share cluster num is only 1, no needs to enable other cluster's pwr.\n");
}
else if(g_l2c_share_info.share_cluster_num == 2)
{
spm_mtcmos_ctrl_cpusys1(STA_POWER_ON, 1);
}
//else if(TBD...)
else
{
pr_err("[ERROR] Inllegal L2$ share_cluster_num!\n");
err = -1;
}
return err;
}
int disable_secondary_clusters_pwr(void)
{
int err = 0;
if(g_l2c_share_info.share_cluster_num == 1)
{
pr_notice("L2$ share cluster num is only 1, no needs to disable other cluster's pwr.\n");
}
else if(g_l2c_share_info.share_cluster_num == 2)
{
spm_mtcmos_ctrl_cpusys1(STA_POWER_DOWN, 1);
}
//else if(TBD...)
else
{
pr_err("[ERROR] Inllegal L2$ share_cluster_num!\n");
err = -1;
}
return err;
}
int config_L2_size(enum options option)
{
int ret = 0;
unsigned long flag;
local_irq_save(flag);
ret = mt_secure_call(MTK_SIP_KERNEL_L2_SHARING, option, g_l2c_share_info.share_cluster_num,
(g_l2c_share_info.cluster_borrow<<16) | (g_l2c_share_info.cluster_return));
local_irq_restore(flag);
return ret;
}
int switch_L2(enum options option)
{
int i, cpu;
int err = 0;
int retry=0;
u64 t1;
u64 t2;
unsigned long mask = (1<<0);
if(option >= BORROW_NONE) {
pr_err("wrong option %d\n", option);
return -1;
}
t1 = sched_clock();
/* bind this process to main cpu */
while(sched_setaffinity(0, (struct cpumask*) &mask) < 0)
{
pr_err("Could not set cpu 0 affinity for current process(%d).\n", retry);
retry++;
if(retry > 100)
{
return -1;
}
}
/*disable hot-plug*/
hps_set_enabled(0);
is_l2_borrowed = 0;
for(i=1; i<NR_CPUS; i++)
{
if(cpu_online(i))
{
err = cpu_down(i);
if(err < 0)
{
pr_err("[L2$ sharing] disable cpu %d failed!\n", i);
hps_set_enabled(1);
return -1;
}
}
}
/* disable preemption */
cpu = get_cpu();
/* enable other clusters' power */
enable_secondary_clusters_pwr();
config_L2_size(option);
if(option == BORROW_L2)
{
is_l2_borrowed = 1;
}
else // if(option == RETURN_L2)
{
is_l2_borrowed = 0;
/* Disable other clusters' power */
disable_secondary_clusters_pwr();
}
/*enable hot-plug*/
hps_set_enabled(1);
put_cpu();
t2 = sched_clock();
if(option == BORROW_L2)
{
pr_notice("[%s]: borrow L2$ cost %llu ns\n", __func__, t2 - t1);
}
else
{
pr_notice("[%s]: return L2$ cost %llu ns\n", __func__, t2 - t1);
}
return err;
}
static ssize_t cur_l2c_show(struct device_driver *driver, char *buf)
{
return 0;
}
static ssize_t cur_l2c_store(struct device_driver *driver, const char *buf,
size_t count)
{
char *p = (char *)buf;
int option, ret;
option = simple_strtoul(p, &p, 10);
if(option >= BORROW_NONE) {
pr_err("wrong option %d\n", option);
return count;
}
pr_notice("config L2 option: %s\n", log[option]);
ret = switch_L2(option);
if (ret < 0)
pr_err("Config L2 error ret:%d by %s\n", ret, log[option]);
return count;
}
DRIVER_ATTR(current_l2c, 0644, cur_l2c_show, cur_l2c_store);
/*
* mt_l2c_init: initialize l2c driver.
* Always return 0.
*/
int mt_l2c_init(void)
{
struct device_node *node;
int ret = 0;
node = of_find_compatible_node(NULL, NULL, "mediatek,l2c_share");
if(node)
{
mp0_cache_config = of_iomap(node, 0);
mp1_cache_config = of_iomap(node, 1);
of_property_read_u32(node, "mediatek,l2c-share-cluster-num", &g_l2c_share_info.share_cluster_num);
of_property_read_u32(node, "mediatek,l2c-cluster-borrow", &g_l2c_share_info.cluster_borrow);
of_property_read_u32(node, "mediatek,l2c-cluster-return", &g_l2c_share_info.cluster_return);
ret = driver_register(&mt_l2c_drv);
if (ret){
printk("fail to register mt_l2c_drv\n");
}
ret = driver_create_file(&mt_l2c_drv, &driver_attr_current_l2c);
if (ret) {
pr_err("fail to create l2$ sharing sysfs files\n");
}
}
else
{
pr_err("[L2$ sharing] failed to find l2$ node in DT!\n");
ret = -1;
}
return ret;
}
module_init(mt_l2c_init);
EXPORT_SYMBOL(switch_L2);
EXPORT_SYMBOL(IS_L2_BORROWED);
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