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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/kernel/irq-mb93091.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/frv/kernel/irq-mb93091.c')
-rw-r--r-- | arch/frv/kernel/irq-mb93091.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/frv/kernel/irq-mb93091.c b/arch/frv/kernel/irq-mb93091.c new file mode 100644 index 000000000000..9778e0ff7c1c --- /dev/null +++ b/arch/frv/kernel/irq-mb93091.c @@ -0,0 +1,116 @@ +/* irq-mb93091.c: MB93091 FPGA interrupt handling + * + * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/config.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/ioport.h> +#include <linux/interrupt.h> +#include <linux/init.h> +#include <linux/irq.h> + +#include <asm/io.h> +#include <asm/system.h> +#include <asm/bitops.h> +#include <asm/delay.h> +#include <asm/irq.h> +#include <asm/irc-regs.h> +#include <asm/irq-routing.h> + +#define __reg16(ADDR) (*(volatile unsigned short *)(ADDR)) + +#define __get_IMR() ({ __reg16(0xffc00004); }) +#define __set_IMR(M) do { __reg16(0xffc00004) = (M); wmb(); } while(0) +#define __get_IFR() ({ __reg16(0xffc0000c); }) +#define __clr_IFR(M) do { __reg16(0xffc0000c) = ~(M); wmb(); } while(0) + +static void frv_fpga_doirq(struct irq_source *source); +static void frv_fpga_control(struct irq_group *group, int irq, int on); + +/*****************************************************************************/ +/* + * FPGA IRQ multiplexor + */ +static struct irq_source frv_fpga[4] = { +#define __FPGA(X, M) \ + [X] = { \ + .muxname = "fpga."#X, \ + .irqmask = M, \ + .doirq = frv_fpga_doirq, \ + } + + __FPGA(0, 0x0028), + __FPGA(1, 0x0050), + __FPGA(2, 0x1c00), + __FPGA(3, 0x6386), +}; + +static struct irq_group frv_fpga_irqs = { + .first_irq = IRQ_BASE_FPGA, + .control = frv_fpga_control, + .sources = { + [ 1] = &frv_fpga[3], + [ 2] = &frv_fpga[3], + [ 3] = &frv_fpga[0], + [ 4] = &frv_fpga[1], + [ 5] = &frv_fpga[0], + [ 6] = &frv_fpga[1], + [ 7] = &frv_fpga[3], + [ 8] = &frv_fpga[3], + [ 9] = &frv_fpga[3], + [10] = &frv_fpga[2], + [11] = &frv_fpga[2], + [12] = &frv_fpga[2], + [13] = &frv_fpga[3], + [14] = &frv_fpga[3], + }, +}; + + +static void frv_fpga_control(struct irq_group *group, int index, int on) +{ + uint16_t imr = __get_IMR(); + + if (on) + imr &= ~(1 << index); + else + imr |= 1 << index; + + __set_IMR(imr); +} + +static void frv_fpga_doirq(struct irq_source *source) +{ + uint16_t mask, imr; + + imr = __get_IMR(); + mask = source->irqmask & ~imr & __get_IFR(); + if (mask) { + __set_IMR(imr | mask); + __clr_IFR(mask); + distribute_irqs(&frv_fpga_irqs, mask); + __set_IMR(imr); + } +} + +void __init fpga_init(void) +{ + __set_IMR(0x7ffe); + __clr_IFR(0x0000); + + frv_irq_route_external(&frv_fpga[0], IRQ_CPU_EXTERNAL0); + frv_irq_route_external(&frv_fpga[1], IRQ_CPU_EXTERNAL1); + frv_irq_route_external(&frv_fpga[2], IRQ_CPU_EXTERNAL2); + frv_irq_route_external(&frv_fpga[3], IRQ_CPU_EXTERNAL3); + frv_irq_set_group(&frv_fpga_irqs); +} |