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/*
* Realtek Semiconductor Corp.
*
* arch/rlx/rlxocp0/irq.c
* Interrupt and exception initialization for RLX OCP Platform
*
* Tony Wu (tonywu@realtek.com.tw)
* Nov. 7, 2006
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/irq.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/irq_cpu.h>
#include <asm/irq_vec.h>
#include <asm/system.h>
#include <asm/rlxregs.h>
#include <asm/rlxbsp.h>
#include <net/rtl/rtl_types.h>
#include "bspchip.h"
static struct irqaction irq_cascade = {
.handler = no_action,
.mask = CPU_MASK_NONE,
.name = "cascade",
};
static void bsp_ictl_irq_mask(unsigned int irq)
{
REG32(BSP_GIMR) &= ~(1 << (irq - BSP_IRQ_ICTL_BASE));
}
static void bsp_ictl_irq_unmask(unsigned int irq)
{
REG32(BSP_GIMR) |= (1 << (irq - BSP_IRQ_ICTL_BASE));
}
static struct irq_chip bsp_ictl_irq = {
.typename = "ICTL",
.ack = bsp_ictl_irq_mask,
.mask = bsp_ictl_irq_mask,
.mask_ack = bsp_ictl_irq_mask,
.unmask = bsp_ictl_irq_unmask,
};
static void bsp_ictl_irq_dispatch(void)
{
volatile unsigned int pending;
pending = REG32(BSP_GIMR) & REG32(BSP_GISR);
if (pending & BSP_UART0_IP)
do_IRQ(BSP_UART0_IRQ);
else if (pending & BSP_TC1_IP)
do_IRQ(BSP_TC1_IRQ);
else if (pending & BSP_GPIO_ABCD_IP)
do_IRQ(BSP_GPIO_ABCD_IRQ);
else {
REG32(BSP_GIMR) &= (~pending);
REG32(BSP_GISR) = REG32(BSP_GISR);
printk("Unknown Interrupt0:%x\n", pending);
#if defined(CONFIG_RTK_VOIP) || defined(CONFIG_RTL_819X)
spurious_interrupt(SPURIOS_INT_CASCADE);
#else
spurious_interrupt();
#endif
}
}
void bsp_irq_dispatch(void)
{
volatile unsigned int pending;
pending = read_c0_cause() & read_c0_status();
if (pending & CAUSEF_IP2)
bsp_ictl_irq_dispatch();
else if (pending & CAUSEF_IP0)
do_IRQ(0);
else if (pending & CAUSEF_IP1)
do_IRQ(1);
else {
#if defined(CONFIG_RTK_VOIP) || defined(CONFIG_RTL_819X)
spurious_interrupt(SPURIOS_INT_CPU);
#else
spurious_interrupt();
#endif
}
}
static void __init bsp_ictl_irq_init(unsigned int irq_base)
{
int i;
for (i=0; i < BSP_IRQ_ICTL_NUM; i++)
set_irq_chip_and_handler(irq_base + i, &bsp_ictl_irq, handle_level_irq);
setup_irq(BSP_ICTL_IRQ, &irq_cascade);
}
void __init bsp_irq_init(void)
{
//unsigned int status;
//volatile unsigned int status;
/* disable ict interrupt */
REG32(BSP_GIMR) = 0;
/* initialize IRQ action handlers */
rlx_cpu_irq_init(BSP_IRQ_CPU_BASE);
rlx_vec_irq_init(BSP_IRQ_LOPI_BASE);
bsp_ictl_irq_init(BSP_IRQ_ICTL_BASE);
/* Set IRR */
REG32(BSP_IRR0) = BSP_IRR0_SETTING;
REG32(BSP_IRR1) = BSP_IRR1_SETTING;
REG32(BSP_IRR2) = BSP_IRR2_SETTING;
REG32(BSP_IRR3) = BSP_IRR3_SETTING;
//status = read_c0_status();
//status = (status&(~ST0_IM))|(CAUSEF_IP2|CAUSEF_IP3|CAUSEF_IP4|CAUSEF_IP5|CAUSEF_IP6);
//write_c0_status(status);
}
#if defined(CONFIG_RTL_8196C) && defined(CONFIG_ARCH_SUSPEND_POSSIBLE)//michaelxxx
#define CONFIG_RTL819X_SUSPEND_CHECK_INTERRUPT
#ifdef CONFIG_RTL819X_SUSPEND_CHECK_INTERRUPT
#include <linux/proc_fs.h>
#include <linux/kernel_stat.h>
#include <asm/uaccess.h>
//#define INT_HIGH_WATER_MARK 1850 //for window size = 1, based on LAN->WAN test result
//#define INT_LOW_WATER_MARK 1150
//#define INT_HIGH_WATER_MARK 9190 //for window size = 5, based on LAN->WAN test result
//#define INT_LOW_WATER_MARK 5500
#define INT_HIGH_WATER_MARK 3200 //for window size = 5, based on WLAN->WAN test result
#define INT_LOW_WATER_MARK 2200
#define INT_WINDOW_SIZE_MAX 10
static int suspend_check_enable = 1;
static int suspend_check_high_water_mark = INT_HIGH_WATER_MARK;
static int suspend_check_low_water_mark = INT_LOW_WATER_MARK;
static int suspend_check_win_size = 5;
static struct timer_list suspend_check_timer;
static int index=0;
static int eth_int_count[INT_WINDOW_SIZE_MAX];
static int wlan_int_count[INT_WINDOW_SIZE_MAX];
int cpu_can_suspend = 1;
int cpu_can_suspend_check_init = 0;
static int read_proc_suspend_check(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
int len;
len = sprintf(page, "enable=%d, winsize=%d(%d), high=%d, low=%d, suspend=%d\n",
suspend_check_enable, suspend_check_win_size, INT_WINDOW_SIZE_MAX,
suspend_check_high_water_mark, suspend_check_low_water_mark, cpu_can_suspend);
if (len <= off+count)
*eof = 1;
*start = page + off;
len -= off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
}
static int write_proc_suspend_check(struct file *file, const char *buffer,
unsigned long count, void *data)
{
char tmp[128];
if (buffer && !copy_from_user(tmp, buffer, 128)) {
sscanf(tmp, "%d %d %d %d",
&suspend_check_enable, &suspend_check_win_size,
&suspend_check_high_water_mark, &suspend_check_low_water_mark);
if (suspend_check_win_size >= INT_WINDOW_SIZE_MAX)
suspend_check_win_size = INT_WINDOW_SIZE_MAX - 1;
if (suspend_check_enable) {
mod_timer(&suspend_check_timer, jiffies + 100);
}
else {
del_timer(&suspend_check_timer);
}
}
return count;
}
static void suspend_check_timer_fn(unsigned long arg)
{
int count, j;
index++;
if (INT_WINDOW_SIZE_MAX <= index)
index = 0;
eth_int_count[index] = kstat_irqs(BSP_SWCORE_IRQ);
wlan_int_count[index] = kstat_irqs(BSP_PCIE_IRQ);
j = index - suspend_check_win_size;
if (j < 0)
j += INT_WINDOW_SIZE_MAX;
count = (eth_int_count[index] - eth_int_count[j]) +
(wlan_int_count[index]- wlan_int_count[j]); //unit: number of interrupt occurred
if (cpu_can_suspend) {
if (count > suspend_check_high_water_mark) {
cpu_can_suspend = 0;
//printk("\n<<<RTL8196C LEAVE SLEEP>>>\n"); /* for Debug Only*/
}
}
else {
if (count < suspend_check_low_water_mark) {
cpu_can_suspend = 1;
//printk("\n<<<RTL8196C ENTER SLEEP>>>\n"); /* for Debug Only*/
}
}
#if 0 /* for Debug Only*/
printk("###index=%d, count=%d (%d+%d) suspend=%d###\n",index, count,
(eth_int_count[index] - eth_int_count[j]),
(wlan_int_count[index]- wlan_int_count[j]),
cpu_can_suspend);
#endif
mod_timer(&suspend_check_timer, jiffies + 100);
}
void suspend_check_interrupt_init(void)
{
struct proc_dir_entry *res;
int i;
res = create_proc_entry("suspend_check", 0, NULL);
if (res) {
res->read_proc = read_proc_suspend_check;
res->write_proc = write_proc_suspend_check;
}
else {
printk("unable to create /proc/suspend_check\n");
}
for (i=0; i<INT_WINDOW_SIZE_MAX; i++) {
wlan_int_count[i] = 0;
eth_int_count[i] = 0;
}
init_timer(&suspend_check_timer);
suspend_check_timer.data = 0;
suspend_check_timer.function = suspend_check_timer_fn;
suspend_check_timer.expires = jiffies + 100; /* in jiffies */
add_timer(&suspend_check_timer);
}
#endif // CONFIG_RTL819X_SUSPEND_CHECK_INTERRUPT
#endif //CONFIG_RTL8196C
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