Hi Geert,
This is part one of the interrupt changes required to avoid using the IRQF_SHARED flag in ne.c.
As mentioned previously, this patch does not solve the unhandled interrupt watchdog problem, but
a simple noirqdebug kernel option is sufficient to sort that out.
Current sole user of the chained polling timer interrupt is ne.c - another user will be the driver
for the ISP1160 USB host adapter to support the NetUSBee ROM port adapter.
Part 2 will be changes to atari/config.c tp make use of the new chained timer.
Cheers,
Michael
Signed-off-by: Michael Schmitz <schmitz@xxxxxxxxxx>
---
arch/m68k/atari/ataints.c | 75 +++++++++++++++++++++++++++++++++++++
arch/m68k/include/asm/atariints.h | 9 ++++
2 files changed, 84 insertions(+), 0 deletions(-)
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c
index 3f41092..96f82f7 100644
--- a/arch/m68k/atari/ataints.c
+++ b/arch/m68k/atari/ataints.c
@@ -122,6 +122,62 @@ static struct irq_chip atari_irq_chip = {
};
/*
+ * ST-MFP timer D chained interrupts - each driver gets its own timer
+ * interrupt instance.
+ */
+
+struct mfptimerbase {
+ volatile struct MFP *mfp;
+ unsigned char mfp_mask, mfp_data;
+ unsigned short int_mask;
+ int handler_irq, mfptimer_irq, server_irq;
+ char *name;
+} stmfp_base = {
+ .mfp = &st_mfp,
+ .int_mask = 0x0,
+ .handler_irq = IRQ_MFP_TIMD,
+ .mfptimer_irq = IRQ_MFP_TIMER1,
+ .name = "MFP Timer D"
+};
+
+static irqreturn_t mfptimer_handler(int irq, void *dev_id)
+{
+ struct mfptimerbase *base = dev_id;
+ int mach_irq;
+ unsigned char ints;
+
+ mach_irq = base->mfptimer_irq;
+ ints = base->int_mask;
+ for (; ints; mach_irq++, ints >>= 1) {
+ if (ints & 1)
+ generic_handle_irq(mach_irq);
+ }
+ return IRQ_HANDLED;
+}
+
+
+static void atari_mfptimer_enable(struct irq_data *data)
+{
+ int mfp_num = IRQ_MFP_TIMER1 - data->irq;
+ stmfp_base.int_mask |= 1 << mfp_num;
+ atari_enable_irq(IRQ_MFP_TIMD);
+}
+
+static void atari_mfptimer_disable(struct irq_data *data)
+{
+ int mfp_num = IRQ_MFP_TIMER1 - data->irq;
+ stmfp_base.int_mask &= ~(1 << mfp_num);
+ if (!stmfp_base.int_mask)
+ atari_disable_irq(IRQ_MFP_TIMD);
+}
+
+static struct irq_chip atari_mfptimer_chip = {
+ .name = "timer_d",
+ .irq_enable = atari_mfptimer_enable,
+ .irq_disable = atari_mfptimer_disable,
+};
+
+/*
* void atari_init_IRQ (void)
*
* Parameters: None
@@ -198,6 +254,26 @@ void __init atari_init_IRQ(void)
/* Initialize the PSG: all sounds off, both ports output */
sound_ym.rd_data_reg_sel = 7;
sound_ym.wd_data = 0xff;
+
+ m68k_setup_irq_controller(&atari_mfptimer_chip, handle_simple_irq,
+ IRQ_MFP_TIMER1, 8);
+ /* possibly unneeded */
+ m68k_setup_irq_controller(&atari_irq_chip, handle_simple_irq,
+ IRQ_MFP_TIMD, 1);
+
+ /* prepare timer D data for use as poll interrupt */
+ /* set Timer D data Register - needs to be > 0 */
+ st_mfp.tim_dt_d = 254; /* < 100 Hz */
+ /* start timer D, div = 1:100 */
+ st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 0xf0) | 0x6;
+
+ /* do we need this one ? */
+ m68k_irq_startup_irq(IRQ_MFP_TIMD);
+
+ /* request timer D dispatch handler */
+ if (request_irq(IRQ_MFP_TIMD, mfptimer_handler, IRQF_SHARED,
+ stmfp_base.name, &stmfp_base))
+ pr_err("Couldn't register %s interrupt\n", stmfp_base.name);
}
diff --git a/arch/m68k/include/asm/atariints.h b/arch/m68k/include/asm/atariints.h
index 904d4ad..5f37fc5 100644
--- a/arch/m68k/include/asm/atariints.h
+++ b/arch/m68k/include/asm/atariints.h
@@ -98,6 +98,15 @@
#define IRQ_SCCA_RX (52)
#define IRQ_SCCA_SPCOND (54)
+/* shared MFP timer D interrupts - hires timer for EtherNEC et al. */
+#define IRQ_MFP_TIMER1 (64)
+#define IRQ_MFP_TIMER2 (65)
+#define IRQ_MFP_TIMER3 (66)
+#define IRQ_MFP_TIMER4 (67)
+#define IRQ_MFP_TIMER5 (68)
+#define IRQ_MFP_TIMER6 (69)
+#define IRQ_MFP_TIMER7 (70)
+#define IRQ_MFP_TIMER8 (71)
#define INT_CLK 24576 /* CLK while int_clk =2.456MHz and divide = 100 */
#define INT_TICKS 246 /* to make sched_time = 99.902... HZ */
--
1.5.6
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