introduce-fiq-migrate-vibrator-gta02-only.patch
From: warmcat <[EMAIL PROTECTED]>
On GTA02 we use FIQ to manage the vibrator IO now. That
is necessary because we stole timer3 from doing hw pwm
for vibrator. This keeps the same UI in /sys but does
"bitbang pwm" on the same vibrator GPIO
From: Andy Green <[EMAIL PROTECTED]>
Signed-off-by: Andy Green <[EMAIL PROTECTED]>
---
arch/arm/mach-s3c2440/fiq_c_isr.c | 13 +++++----
arch/arm/mach-s3c2440/mach-gta02.c | 38 ++++++++++++++++++++++++++
drivers/leds/Kconfig | 1 +
drivers/leds/leds-neo1973-vibrator.c | 24 +++++++++++++++-
include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h | 9 +++++-
5 files changed, 77 insertions(+), 8 deletions(-)
diff --git a/arch/arm/mach-s3c2440/fiq_c_isr.c b/arch/arm/mach-s3c2440/fiq_c_isr.c
index a71a234..38692fc 100644
--- a/arch/arm/mach-s3c2440/fiq_c_isr.c
+++ b/arch/arm/mach-s3c2440/fiq_c_isr.c
@@ -79,6 +79,7 @@ u16 _fiq_timer_divisor;
*/
extern void __attribute__ ((naked)) s3c2440_fiq_isr(void);
+
/* this is copied into the hard FIQ vector during init */
static void __attribute__ ((naked)) s3c2440_FIQ_Branch(void)
@@ -128,7 +129,7 @@ static int fiq_init_irq_source(int irq_index_fiq)
_fiq_irq = irq_index_fiq;
_fiq_ack_mask = 1 << (irq_index_fiq - S3C2410_CPUIRQ_OFFSET);
- timer_index = (irq_index_fiq - IRQ_TIMER0);
+ _fiq_timer_index = (irq_index_fiq - IRQ_TIMER0);
/* set up the timer to operate as a pwm device */
@@ -136,12 +137,11 @@ static int fiq_init_irq_source(int irq_index_fiq)
if (rc)
goto bail;
- pwm_timer_fiq.timerid = PWM0 + timer_index;
+ pwm_timer_fiq.timerid = PWM0 + _fiq_timer_index;
pwm_timer_fiq.prescaler = (6 - 1) / 2;
pwm_timer_fiq.divider = S3C2410_TCFG1_MUX3_DIV2;
/* default rate == ~32us */
- pwm_timer_fiq.counter = pwm_timer_fiq.comparer =
- timer_divisor = 64;
+ pwm_timer_fiq.counter = pwm_timer_fiq.comparer = 3000;
rc = s3c2410_pwm_enable(&pwm_timer_fiq);
if (rc)
@@ -149,6 +149,8 @@ static int fiq_init_irq_source(int irq_index_fiq)
s3c2410_pwm_start(&pwm_timer_fiq);
+ _fiq_timer_divisor = 0xffff; /* so kick will work initially */
+
/* let our selected interrupt be a magic FIQ interrupt */
__raw_writel(_fiq_ack_mask, S3C2410_INTMOD);
@@ -189,7 +191,7 @@ void fiq_kick(void)
S3C2410_INTMSK);
tcon = __raw_readl(S3C2410_TCON) & ~S3C2410_TCON_T3START;
/* fake the timer to a count of 1 */
- __raw_writel(1, S3C2410_TCNTB(timer_index));
+ __raw_writel(1, S3C2410_TCNTB(_fiq_timer_index));
__raw_writel(tcon | S3C2410_TCON_T3MANUALUPD, S3C2410_TCON);
__raw_writel(tcon | S3C2410_TCON_T3MANUALUPD | S3C2410_TCON_T3START,
S3C2410_TCON);
@@ -207,6 +209,7 @@ static int __init sc32440_fiq_probe(struct platform_device *pdev)
if (!r)
return -EIO;
+
/* configure for the interrupt we are meant to use */
printk(KERN_INFO"Enabling FIQ using irq %d\n", r->start);
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index 24aaddd..610a382 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -92,12 +92,50 @@
struct _fiq_ipc fiq_ipc;
EXPORT_SYMBOL(fiq_ipc);
+#define DIVISOR_FROM_US(x) ((x) << 1)
+
+#define FIQ_DIVISOR_VIBRATOR DIVISOR_FROM_US(100)
+
/* define FIQ ISR */
FIQ_HANDLER_START()
/* define your locals here -- no initializers though */
+ u16 divisor;
FIQ_HANDLER_ENTRY(256, 512)
/* Your ISR here :-) */
+ divisor = 0xffff;
+
+ /* Vibrator servicing */
+
+ if (fiq_ipc.vib_pwm_latched || fiq_ipc.vib_pwm) { /* not idle */
+ if (((u8)_fiq_count_fiqs) == fiq_ipc.vib_pwm_latched)
+ s3c2410_gpio_setpin(fiq_ipc.vib_gpio_pin, 0);
+ if (((u8)_fiq_count_fiqs) == 0) {
+ fiq_ipc.vib_pwm_latched = fiq_ipc.vib_pwm;
+ if (fiq_ipc.vib_pwm_latched)
+ s3c2410_gpio_setpin(fiq_ipc.vib_gpio_pin, 1);
+ }
+ divisor = FIQ_DIVISOR_VIBRATOR;
+ }
+
+ /* TODO: HDQ servicing */
+
+
+
+ /* 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
+ */
+ if (divisor == 0xffff) /* mask the fiq irq source */
+ __raw_writel(__raw_readl(S3C2410_INTMSK) | _fiq_ack_mask,
+ S3C2410_INTMSK);
+ else /* still working, maybe at a different rate */
+ __raw_writel(divisor, S3C2410_TCNTB(_fiq_timer_index));
+ _fiq_timer_divisor = divisor;
+
FIQ_HANDLER_END()
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 2f95707..77aa3bd 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -117,6 +117,7 @@ config LEDS_CM_X270
config LEDS_NEO1973_VIBRATOR
tristate "Vibrator Support for the FIC Neo1973 GSM phone"
depends on LEDS_CLASS && MACH_NEO1973
+ select S3C2440_C_FIQ
help
This option enables support for the vibrator on the FIC Neo1973.
diff --git a/drivers/leds/leds-neo1973-vibrator.c b/drivers/leds/leds-neo1973-vibrator.c
index c943a6a..36ed216 100644
--- a/drivers/leds/leds-neo1973-vibrator.c
+++ b/drivers/leds/leds-neo1973-vibrator.c
@@ -23,6 +23,8 @@
#include <asm/arch/gta01.h>
#include <asm/plat-s3c/regs-timer.h>
+#include <asm/arch-s3c2410/fiq_ipc_gta02.h>
+
#define COUNTER 64
struct neo1973_vib_priv {
@@ -39,6 +41,11 @@ static void neo1973_vib_vib_set(struct led_classdev *led_cdev,
struct neo1973_vib_priv *vp =
container_of(led_cdev, struct neo1973_vib_priv, cdev);
+ if (machine_is_neo1973_gta02()) { /* use FIQ to control GPIO */
+ fiq_ipc.vib_pwm = value; /* set it for FIQ */
+ fiq_kick(); /* start up FIQs if not already going */
+ return;
+ }
/*
* value == 255 -> 99% duty cycle (full power)
* value == 128 -> 50% duty cycle (medium power)
@@ -46,7 +53,7 @@ static void neo1973_vib_vib_set(struct led_classdev *led_cdev,
*/
mutex_lock(&vp->mutex);
if (vp->has_pwm)
- s3c2410_pwm_duty_cycle(value/4, &vp->pwm);
+ s3c2410_pwm_duty_cycle(value / 4, &vp->pwm);
else {
if (value)
s3c2410_gpio_setpin(vp->gpio, 1);
@@ -123,6 +130,15 @@ static int __init neo1973_vib_probe(struct platform_device *pdev)
neo1973_vib_led.gpio = r->start;
platform_set_drvdata(pdev, &neo1973_vib_led);
+ if (machine_is_neo1973_gta02()) { /* use FIQ to control GPIO */
+ s3c2410_gpio_setpin(neo1973_vib_led.gpio, 0); /* off */
+ s3c2410_gpio_cfgpin(neo1973_vib_led.gpio, S3C2410_GPIO_OUTPUT);
+ /* safe, kmalloc'd copy needed for FIQ ISR */
+ fiq_ipc.vib_gpio_pin = neo1973_vib_led.gpio;
+ fiq_ipc.vib_pwm = 0; /* off */
+ goto configured;
+ }
+
/* TOUT3 */
if (neo1973_vib_led.gpio == S3C2410_GPB3) {
rc = neo1973_vib_init_hw(&neo1973_vib_led);
@@ -133,7 +149,7 @@ static int __init neo1973_vib_probe(struct platform_device *pdev)
s3c2410_gpio_cfgpin(neo1973_vib_led.gpio, S3C2410_GPB3_TOUT3);
neo1973_vib_led.has_pwm = 1;
}
-
+configured:
mutex_init(&neo1973_vib_led.mutex);
return led_classdev_register(&pdev->dev, &neo1973_vib_led.cdev);
@@ -141,6 +157,10 @@ static int __init neo1973_vib_probe(struct platform_device *pdev)
static int neo1973_vib_remove(struct platform_device *pdev)
{
+ if (machine_is_neo1973_gta02()) /* use FIQ to control GPIO */
+ fiq_ipc.vib_pwm = 0; /* off */
+ /* would only need kick if already off so no kick needed */
+
if (neo1973_vib_led.has_pwm)
s3c2410_pwm_disable(&neo1973_vib_led.pwm);
diff --git a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
index 4830b31..b590c17 100644
--- a/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
+++ b/include/asm-arm/arch-s3c2410/fiq_ipc_gta02.h
@@ -16,8 +16,15 @@
* for testing
*/
+#include <asm/arch/pwm.h>
+#include <asm/plat-s3c/regs-timer.h>
+
+
struct _fiq_ipc {
- u8 u8a[0]; /* placeholder */
+ /* vibrator */
+ unsigned long vib_gpio_pin; /* which pin to meddle with */
+ u8 vib_pwm; /* 0 = OFF -- will ensure GPIO deasserted and stop FIQ */
+ u8 vib_pwm_latched;
};
/* actual definition lives in arch/arm/mach-s3c2440/fiq_c_isr.c */
