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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /arch/m68k/mac/baboon.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/m68k/mac/baboon.c')
-rw-r--r-- | arch/m68k/mac/baboon.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/m68k/mac/baboon.c b/arch/m68k/mac/baboon.c new file mode 100644 index 000000000..a7d280220 --- /dev/null +++ b/arch/m68k/mac/baboon.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Baboon Custom IC Management + * + * The Baboon custom IC controls the IDE, PCMCIA and media bay on the + * PowerBook 190. It multiplexes multiple interrupt sources onto the + * Nubus slot $C interrupt. + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/irq.h> + +#include <asm/macintosh.h> +#include <asm/macints.h> +#include <asm/mac_baboon.h> + +int baboon_present; +static volatile struct baboon *baboon; + +/* + * Baboon initialization. + */ + +void __init baboon_init(void) +{ + if (macintosh_config->ident != MAC_MODEL_PB190) { + baboon = NULL; + baboon_present = 0; + return; + } + + baboon = (struct baboon *) BABOON_BASE; + baboon_present = 1; + + pr_debug("Baboon detected at %p\n", baboon); +} + +/* + * Baboon interrupt handler. + * XXX how do you clear a pending IRQ? is it even necessary? + */ + +static void baboon_irq(struct irq_desc *desc) +{ + short events, irq_bit; + int irq_num; + + events = baboon->mb_ifr & 0x07; + irq_num = IRQ_BABOON_0; + irq_bit = 1; + do { + if (events & irq_bit) { + events &= ~irq_bit; + generic_handle_irq(irq_num); + } + ++irq_num; + irq_bit <<= 1; + } while (events); +} + +/* + * Register the Baboon interrupt dispatcher on nubus slot $C. + */ + +void __init baboon_register_interrupts(void) +{ + irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq); +} + +/* + * The means for masking individual Baboon interrupts remains a mystery. + * However, since we only use the IDE IRQ, we can just enable/disable all + * Baboon interrupts. If/when we handle more than one Baboon IRQ, we must + * either figure out how to mask them individually or else implement the + * same workaround that's used for NuBus slots (see nubus_disabled and + * via_nubus_irq_shutdown). + */ + +void baboon_irq_enable(int irq) +{ + mac_irq_enable(irq_get_irq_data(IRQ_NUBUS_C)); +} + +void baboon_irq_disable(int irq) +{ + mac_irq_disable(irq_get_irq_data(IRQ_NUBUS_C)); +} |