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#include <linux/kernel.h>
#include <asm/fiq.h>
#include <plat/pwm.h>
#include <mach/regs-irq.h>
#include <mach/irqs.h>
#include <linux/io.h>
#include <linux/hdq.h>
/* -------------------------------------------------------------------------------
* GTA02 FIQ related
*
* Calls into vibrator and hdq and based on the return values
* determines if we the FIQ source be kept alive
*/
#define DIVISOR_FROM_US(x) ((x) << 3)
#ifdef CONFIG_HDQ_GPIO_BITBANG
#define FIQ_DIVISOR_HDQ DIVISOR_FROM_US(HDQ_SAMPLE_PERIOD_US)
extern int hdq_fiq_handler(void);
#endif
#ifdef CONFIG_LEDS_GTA02_VIBRATOR
#define FIQ_DIVISOR_VIBRATOR DIVISOR_FROM_US(100)
extern int gta02_vibrator_fiq_handler(void);
#endif
/* Global data related to our fiq source */
static uint32_t gta02_fiq_ack_mask;
static struct s3c2410_pwm gta02_fiq_pwm_timer;
static uint16_t gta02_fiq_timer_index;
static int gta02_fiq_irq;
void gta02_fiq_handler(void)
{
uint16_t divisor = 0xffff;
/* disable further timer interrupts if nobody has any work
* or adjust rate according to who still has work
*
* CAUTION: it means forground code must disable FIQ around
* its own non-atomic S3C2410_INTMSK changes... not common
* thankfully and taken care of by the fiq-basis patch
*/
#ifdef CONFIG_HDQ_GPIO_BITBANG
if (hdq_fiq_handler())
divisor = FIQ_DIVISOR_HDQ;
#endif
#ifdef CONFIG_LEDS_GTA02_VIBRATOR
if (gta02_vibrator_fiq_handler())
divisor = FIQ_DIVISOR_VIBRATOR;
#endif
if (divisor == 0xffff) /* mask the fiq irq source */
__raw_writel(__raw_readl(S3C2410_INTMSK) | gta02_fiq_ack_mask,
S3C2410_INTMSK);
else /* still working, maybe at a different rate */
__raw_writel(divisor, S3C2410_TCNTB(gta02_fiq_timer_index));
__raw_writel(gta02_fiq_ack_mask, S3C2410_SRCPND);
}
void gta02_fiq_kick(void)
{
unsigned long flags;
uint32_t tcon;
/* we have to take care about FIQ because this modification is
* non-atomic, FIQ could come in after the read and before the
* writeback and its changes to the register would be lost
* (platform INTMSK mod code is taken care of already)
*/
local_save_flags(flags);
local_fiq_disable();
/* allow FIQs to resume */
__raw_writel(__raw_readl(S3C2410_INTMSK) &
~(1 << (gta02_fiq_irq - S3C2410_CPUIRQ_OFFSET)),
S3C2410_INTMSK);
tcon = __raw_readl(S3C2410_TCON) & ~S3C2410_TCON_T2START;
/* fake the timer to a count of 1 */
__raw_writel(1, S3C2410_TCNTB(gta02_fiq_timer_index));
__raw_writel(tcon | S3C2410_TCON_T2MANUALUPD, S3C2410_TCON);
__raw_writel(tcon | S3C2410_TCON_T2MANUALUPD | S3C2410_TCON_T2START,
S3C2410_TCON);
__raw_writel(tcon | S3C2410_TCON_T2START, S3C2410_TCON);
local_irq_restore(flags);
}
int gta02_fiq_enable(void)
{
int irq_index_fiq = IRQ_TIMER2;
int rc = 0;
local_fiq_disable();
gta02_fiq_irq = irq_index_fiq;
gta02_fiq_ack_mask = 1 << (irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
gta02_fiq_timer_index = (irq_index_fiq - IRQ_TIMER0);
/* set up the timer to operate as a pwm device */
rc = s3c2410_pwm_init(>a02_fiq_pwm_timer);
if (rc)
goto bail;
gta02_fiq_pwm_timer.timerid = PWM0 + gta02_fiq_timer_index;
gta02_fiq_pwm_timer.prescaler = (6 - 1) / 2;
gta02_fiq_pwm_timer.divider = S3C2410_TCFG1_MUX3_DIV2;
/* default rate == ~32us */
gta02_fiq_pwm_timer.counter = gta02_fiq_pwm_timer.comparer = 3000;
rc = s3c2410_pwm_enable(>a02_fiq_pwm_timer);
if (rc)
goto bail;
s3c2410_pwm_start(>a02_fiq_pwm_timer);
/* let our selected interrupt be a magic FIQ interrupt */
__raw_writel(gta02_fiq_ack_mask, S3C2410_INTMOD);
/* it's ready to go as soon as we unmask the source in S3C2410_INTMSK */
local_fiq_enable();
set_fiq_c_handler(gta02_fiq_handler);
return 0;
bail:
printk(KERN_ERR "Could not initialize FIQ for GTA02: %d\n", rc);
return rc;
}
void gta02_fiq_disable(void)
{
__raw_writel(0, S3C2410_INTMOD);
local_fiq_disable();
gta02_fiq_irq = 0; /* no active source interrupt now either */
}
/* -------------------- /GTA02 FIQ Handler ------------------------------------- */
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