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linux/arch/ppc/platforms/sbc82xx.c
Jeff Garzik e8f3954958 [PPC] minor irq handler cleanups 
- whitespace cleanups

- remove pointless prototype (uses always follow func implementation)

- 'irq' argument is used here purely as a local variable.  rename
  argument to 'dummy' and define 'irq' as local to make this plain.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
2008-04-20 18:51:01 -04:00

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/*
* SBC82XX platform support
*
* Author: Guy Streeter <streeter@redhat.com>
*
* Derived from: est8260_setup.c by Allen Curtis, ONZ
*
* Copyright 2004 Red Hat, Inc.
*
* 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/stddef.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/mpc8260.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/todc.h>
#include <asm/immap_cpm2.h>
#include <asm/pci.h>
static void (*callback_init_IRQ)(void);
extern unsigned char __res[sizeof(bd_t)];
extern void (*late_time_init)(void);
#ifdef CONFIG_GEN_RTC
TODC_ALLOC();
/*
* Timer init happens before mem_init but after paging init, so we cannot
* directly use ioremap() at that time.
* late_time_init() is call after paging init.
*/
static void sbc82xx_time_init(void)
{
volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
/* Set up CS11 for RTC chip */
mc->memc_br11=0;
mc->memc_or11=0xffff0836;
mc->memc_br11=SBC82xx_TODC_NVRAM_ADDR | 0x0801;
TODC_INIT(TODC_TYPE_MK48T59, 0, 0, SBC82xx_TODC_NVRAM_ADDR, 0);
todc_info->nvram_data =
(unsigned int)ioremap(todc_info->nvram_data, 0x2000);
BUG_ON(!todc_info->nvram_data);
ppc_md.get_rtc_time = todc_get_rtc_time;
ppc_md.set_rtc_time = todc_set_rtc_time;
ppc_md.nvram_read_val = todc_direct_read_val;
ppc_md.nvram_write_val = todc_direct_write_val;
todc_time_init();
}
#endif /* CONFIG_GEN_RTC */
static volatile char *sbc82xx_i8259_map;
static char sbc82xx_i8259_mask = 0xff;
static DEFINE_SPINLOCK(sbc82xx_i8259_lock);
static void sbc82xx_i8259_mask_and_ack_irq(unsigned int irq_nr)
{
unsigned long flags;
irq_nr -= NR_SIU_INTS;
spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
sbc82xx_i8259_mask |= 1 << irq_nr;
(void) sbc82xx_i8259_map[1]; /* Dummy read */
sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
sbc82xx_i8259_map[0] = 0x20; /* OCW2: Non-specific EOI */
spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
}
static void sbc82xx_i8259_mask_irq(unsigned int irq_nr)
{
unsigned long flags;
irq_nr -= NR_SIU_INTS;
spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
sbc82xx_i8259_mask |= 1 << irq_nr;
sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
}
static void sbc82xx_i8259_unmask_irq(unsigned int irq_nr)
{
unsigned long flags;
irq_nr -= NR_SIU_INTS;
spin_lock_irqsave(&sbc82xx_i8259_lock, flags);
sbc82xx_i8259_mask &= ~(1 << irq_nr);
sbc82xx_i8259_map[1] = sbc82xx_i8259_mask;
spin_unlock_irqrestore(&sbc82xx_i8259_lock, flags);
}
static void sbc82xx_i8259_end_irq(unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))
&& irq_desc[irq].action)
sbc82xx_i8259_unmask_irq(irq);
}
struct hw_interrupt_type sbc82xx_i8259_ic = {
.typename = " i8259 ",
.enable = sbc82xx_i8259_unmask_irq,
.disable = sbc82xx_i8259_mask_irq,
.ack = sbc82xx_i8259_mask_and_ack_irq,
.end = sbc82xx_i8259_end_irq,
};
static irqreturn_t sbc82xx_i8259_demux(int dummy, void *dev_id)
{
int irq;
spin_lock(&sbc82xx_i8259_lock);
sbc82xx_i8259_map[0] = 0x0c; /* OCW3: Read IR register on RD# pulse */
irq = sbc82xx_i8259_map[0] & 7; /* Read IRR */
if (irq == 7) {
/* Possible spurious interrupt */
int isr;
sbc82xx_i8259_map[0] = 0x0b; /* OCW3: Read IS register on RD# pulse */
isr = sbc82xx_i8259_map[0]; /* Read ISR */
if (!(isr & 0x80)) {
printk(KERN_INFO "Spurious i8259 interrupt\n");
return IRQ_HANDLED;
}
}
__do_IRQ(NR_SIU_INTS + irq);
return IRQ_HANDLED;
}
static struct irqaction sbc82xx_i8259_irqaction = {
.handler = sbc82xx_i8259_demux,
.flags = IRQF_DISABLED,
.mask = CPU_MASK_NONE,
.name = "i8259 demux",
};
void __init sbc82xx_init_IRQ(void)
{
volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
volatile intctl_cpm2_t *ic = &cpm2_immr->im_intctl;
int i;
callback_init_IRQ();
/* u-boot doesn't always set the board up correctly */
mc->memc_br5 = 0;
mc->memc_or5 = 0xfff00856;
mc->memc_br5 = 0x22000801;
sbc82xx_i8259_map = ioremap(0x22008000, 2);
if (!sbc82xx_i8259_map) {
printk(KERN_CRIT "Mapping i8259 interrupt controller failed\n");
return;
}
/* Set up the interrupt handlers for the i8259 IRQs */
for (i = NR_SIU_INTS; i < NR_SIU_INTS + 8; i++) {
irq_desc[i].chip = &sbc82xx_i8259_ic;
irq_desc[i].status |= IRQ_LEVEL;
}
/* make IRQ6 level sensitive */
ic->ic_siexr &= ~(1 << (14 - (SIU_INT_IRQ6 - SIU_INT_IRQ1)));
irq_desc[SIU_INT_IRQ6].status |= IRQ_LEVEL;
/* Initialise the i8259 */
sbc82xx_i8259_map[0] = 0x1b; /* ICW1: Level, no cascade, ICW4 */
sbc82xx_i8259_map[1] = 0x00; /* ICW2: vector base */
/* No ICW3 (no cascade) */
sbc82xx_i8259_map[1] = 0x01; /* ICW4: 8086 mode, normal EOI */
sbc82xx_i8259_map[0] = 0x0b; /* OCW3: Read IS register on RD# pulse */
sbc82xx_i8259_map[1] = sbc82xx_i8259_mask; /* Set interrupt mask */
/* Request cascade IRQ */
if (setup_irq(SIU_INT_IRQ6, &sbc82xx_i8259_irqaction)) {
printk("Installation of i8259 IRQ demultiplexer failed.\n");
}
}
static int sbc82xx_pci_map_irq(struct pci_dev *dev, unsigned char idsel,
unsigned char pin)
{
static char pci_irq_table[][4] = {
/*
* PCI IDSEL/INTPIN->INTLINE
* A B C D
*/
{ SBC82xx_PIRQA, SBC82xx_PIRQB, SBC82xx_PIRQC, SBC82xx_PIRQD }, /* IDSEL 16 - PMC slot */
{ SBC82xx_PC_IRQA, SBC82xx_PC_IRQB, -1, -1 }, /* IDSEL 17 - CardBus */
{ SBC82xx_PIRQA, SBC82xx_PIRQB, SBC82xx_PIRQC, SBC82xx_PIRQD }, /* IDSEL 18 - PCI-X bridge */
};
const long min_idsel = 16, max_idsel = 18, irqs_per_slot = 4;
return PCI_IRQ_TABLE_LOOKUP;
}
static void __devinit quirk_sbc8260_cardbus(struct pci_dev *pdev)
{
uint32_t ctrl;
if (pdev->bus->number != 0 || pdev->devfn != PCI_DEVFN(17, 0))
return;
printk(KERN_INFO "Setting up CardBus controller\n");
/* Set P2CCLK bit in System Control Register */
pci_read_config_dword(pdev, 0x80, &ctrl);
ctrl |= (1<<27);
pci_write_config_dword(pdev, 0x80, ctrl);
/* Set MFUNC up for PCI IRQ routing via INTA and INTB, and LEDs. */
pci_write_config_dword(pdev, 0x8c, 0x00c01d22);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_1420, quirk_sbc8260_cardbus);
void __init
m82xx_board_init(void)
{
/* u-boot may be using one of the FCC Ethernet devices.
Use the MAC address to the SCC. */
__res[offsetof(bd_t, bi_enetaddr[5])] &= ~3;
/* Anything special for this platform */
callback_init_IRQ = ppc_md.init_IRQ;
ppc_md.init_IRQ = sbc82xx_init_IRQ;
ppc_md.pci_map_irq = sbc82xx_pci_map_irq;
#ifdef CONFIG_GEN_RTC
ppc_md.time_init = NULL;
ppc_md.get_rtc_time = NULL;
ppc_md.set_rtc_time = NULL;
ppc_md.nvram_read_val = NULL;
ppc_md.nvram_write_val = NULL;
late_time_init = sbc82xx_time_init;
#endif /* CONFIG_GEN_RTC */
}
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