diff options
author | Michael Schmitz <schmitzmic@gmail.com> | 2013-04-06 00:26:37 (GMT) |
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committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2013-04-16 19:09:21 (GMT) |
commit | b1ae432c5e3d682d86a88fc798a9ed2469c14a7a (patch) | |
tree | 5ec9395eff73162d842802019604ca3058f32e46 /arch/m68k/atari | |
parent | 84b16b7b0d5c818fadc731a69965dc76dce0c91e (diff) | |
download | linux-b1ae432c5e3d682d86a88fc798a9ed2469c14a7a.tar.xz |
m68k/atari: use dedicated irq_chip for timer D interrupts
Add a special irq_chip for the Atari MFP timer D interrupt,
which is used as a polling timer for EtherNEC and NetUSBee
Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/atari')
-rw-r--r-- | arch/m68k/atari/ataints.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/m68k/atari/ataints.c b/arch/m68k/atari/ataints.c index 3f41092..f699c82 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 = data->irq - IRQ_MFP_TIMER1; + 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 = data->irq - IRQ_MFP_TIMER1; + 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 +254,20 @@ 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); + + /* 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; + + /* 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); } |