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alistair23-linux/arch/blackfin/mach-common/ints-priority.c
Mike Frysinger e2a8092c3f Blackfin: bf537: fix excessive gpio int demuxing 
The search logic in the gpio demux walks all possible gpio blocks starting
at the specified pin.  The trouble on bf537 parts when we demux the port
F and port G mask A interrupts is that we also demux port H mask A ints.
Most of the time this isn't an issue as people don't usually use port H,
but might as well avoid it when possible.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-05-25 08:13:43 -04:00

1284 lines
29 KiB
C
Raw Blame History

/*
* Set up the interrupt priorities
*
* Copyright 2004-2009 Analog Devices Inc.
* 2003 Bas Vermeulen <bas@buyways.nl>
* 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
* 2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
* 1999 D. Jeff Dionne <jeff@uclinux.org>
* 1996 Roman Zippel
*
* Licensed under the GPL-2
*/
#include <linux/module.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/irq.h>
#include <linux/sched.h>
#ifdef CONFIG_IPIPE
#include <linux/ipipe.h>
#endif
#include <asm/traps.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/irq_handler.h>
#include <asm/dpmc.h>
#define SIC_SYSIRQ(irq) (irq - (IRQ_CORETMR + 1))
/*
* NOTES:
* - we have separated the physical Hardware interrupt from the
* levels that the LINUX kernel sees (see the description in irq.h)
* -
*/
#ifndef CONFIG_SMP
/* Initialize this to an actual value to force it into the .data
* section so that we know it is properly initialized at entry into
* the kernel but before bss is initialized to zero (which is where
* it would live otherwise). The 0x1f magic represents the IRQs we
* cannot actually mask out in hardware.
*/
unsigned long bfin_irq_flags = 0x1f;
EXPORT_SYMBOL(bfin_irq_flags);
#endif
#ifdef CONFIG_PM
unsigned long bfin_sic_iwr[3]; /* Up to 3 SIC_IWRx registers */
unsigned vr_wakeup;
#endif
static struct ivgx {
/* irq number for request_irq, available in mach-bf5xx/irq.h */
unsigned int irqno;
/* corresponding bit in the SIC_ISR register */
unsigned int isrflag;
} ivg_table[NR_PERI_INTS];
static struct ivg_slice {
/* position of first irq in ivg_table for given ivg */
struct ivgx *ifirst;
struct ivgx *istop;
} ivg7_13[IVG13 - IVG7 + 1];
/*
* Search SIC_IAR and fill tables with the irqvalues
* and their positions in the SIC_ISR register.
*/
static void __init search_IAR(void)
{
unsigned ivg, irq_pos = 0;
for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
int irqN;
ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {
int irqn;
u32 iar = bfin_read32((unsigned long *)SIC_IAR0 +
#if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \
defined(CONFIG_BF538) || defined(CONFIG_BF539)
((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))
#else
(irqN >> 3)
#endif
);
for (irqn = irqN; irqn < irqN + 4; ++irqn) {
int iar_shift = (irqn & 7) * 4;
if (ivg == (0xf & (iar >> iar_shift))) {
ivg_table[irq_pos].irqno = IVG7 + irqn;
ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
ivg7_13[ivg].istop++;
irq_pos++;
}
}
}
}
}
/*
* This is for core internal IRQs
*/
void bfin_ack_noop(struct irq_data *d)
{
/* Dummy function. */
}
static void bfin_core_mask_irq(struct irq_data *d)
{
bfin_irq_flags &= ~(1 << d->irq);
if (!hard_irqs_disabled())
hard_local_irq_enable();
}
static void bfin_core_unmask_irq(struct irq_data *d)
{
bfin_irq_flags |= 1 << d->irq;
/*
* If interrupts are enabled, IMASK must contain the same value
* as bfin_irq_flags. Make sure that invariant holds. If interrupts
* are currently disabled we need not do anything; one of the
* callers will take care of setting IMASK to the proper value
* when reenabling interrupts.
* local_irq_enable just does "STI bfin_irq_flags", so it's exactly
* what we need.
*/
if (!hard_irqs_disabled())
hard_local_irq_enable();
return;
}
void bfin_internal_mask_irq(unsigned int irq)
{
unsigned long flags = hard_local_irq_save();
#ifdef SIC_IMASK0
unsigned mask_bank = SIC_SYSIRQ(irq) / 32;
unsigned mask_bit = SIC_SYSIRQ(irq) % 32;
bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) &
~(1 << mask_bit));
# ifdef CONFIG_SMP
bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) &
~(1 << mask_bit));
# endif
#else
bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
~(1 << SIC_SYSIRQ(irq)));
#endif
hard_local_irq_restore(flags);
}
static void bfin_internal_mask_irq_chip(struct irq_data *d)
{
bfin_internal_mask_irq(d->irq);
}
#ifdef CONFIG_SMP
static void bfin_internal_unmask_irq_affinity(unsigned int irq,
const struct cpumask *affinity)
#else
void bfin_internal_unmask_irq(unsigned int irq)
#endif
{
unsigned long flags = hard_local_irq_save();
#ifdef SIC_IMASK0
unsigned mask_bank = SIC_SYSIRQ(irq) / 32;
unsigned mask_bit = SIC_SYSIRQ(irq) % 32;
# ifdef CONFIG_SMP
if (cpumask_test_cpu(0, affinity))
# endif
bfin_write_SIC_IMASK(mask_bank,
bfin_read_SIC_IMASK(mask_bank) |
(1 << mask_bit));
# ifdef CONFIG_SMP
if (cpumask_test_cpu(1, affinity))
bfin_write_SICB_IMASK(mask_bank,
bfin_read_SICB_IMASK(mask_bank) |
(1 << mask_bit));
# endif
#else
bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
(1 << SIC_SYSIRQ(irq)));
#endif
hard_local_irq_restore(flags);
}
#ifdef CONFIG_SMP
static void bfin_internal_unmask_irq_chip(struct irq_data *d)
{
bfin_internal_unmask_irq_affinity(d->irq, d->affinity);
}
static int bfin_internal_set_affinity(struct irq_data *d,
const struct cpumask *mask, bool force)
{
bfin_internal_mask_irq(d->irq);
bfin_internal_unmask_irq_affinity(d->irq, mask);
return 0;
}
#else
static void bfin_internal_unmask_irq_chip(struct irq_data *d)
{
bfin_internal_unmask_irq(d->irq);
}
#endif
#ifdef CONFIG_PM
int bfin_internal_set_wake(unsigned int irq, unsigned int state)
{
u32 bank, bit, wakeup = 0;
unsigned long flags;
bank = SIC_SYSIRQ(irq) / 32;
bit = SIC_SYSIRQ(irq) % 32;
switch (irq) {
#ifdef IRQ_RTC
case IRQ_RTC:
wakeup |= WAKE;
break;
#endif
#ifdef IRQ_CAN0_RX
case IRQ_CAN0_RX:
wakeup |= CANWE;
break;
#endif
#ifdef IRQ_CAN1_RX
case IRQ_CAN1_RX:
wakeup |= CANWE;
break;
#endif
#ifdef IRQ_USB_INT0
case IRQ_USB_INT0:
wakeup |= USBWE;
break;
#endif
#ifdef CONFIG_BF54x
case IRQ_CNT:
wakeup |= ROTWE;
break;
#endif
default:
break;
}
flags = hard_local_irq_save();
if (state) {
bfin_sic_iwr[bank] |= (1 << bit);
vr_wakeup |= wakeup;
} else {
bfin_sic_iwr[bank] &= ~(1 << bit);
vr_wakeup &= ~wakeup;
}
hard_local_irq_restore(flags);
return 0;
}
static int bfin_internal_set_wake_chip(struct irq_data *d, unsigned int state)
{
return bfin_internal_set_wake(d->irq, state);
}
#else
# define bfin_internal_set_wake_chip NULL
#endif
static struct irq_chip bfin_core_irqchip = {
.name = "CORE",
.irq_ack = bfin_ack_noop,
.irq_mask = bfin_core_mask_irq,
.irq_unmask = bfin_core_unmask_irq,
};
static struct irq_chip bfin_internal_irqchip = {
.name = "INTN",
.irq_ack = bfin_ack_noop,
.irq_mask = bfin_internal_mask_irq_chip,
.irq_unmask = bfin_internal_unmask_irq_chip,
.irq_mask_ack = bfin_internal_mask_irq_chip,
.irq_disable = bfin_internal_mask_irq_chip,
.irq_enable = bfin_internal_unmask_irq_chip,
#ifdef CONFIG_SMP
.irq_set_affinity = bfin_internal_set_affinity,
#endif
.irq_set_wake = bfin_internal_set_wake_chip,
};
void bfin_handle_irq(unsigned irq)
{
#ifdef CONFIG_IPIPE
struct pt_regs regs; /* Contents not used. */
ipipe_trace_irq_entry(irq);
__ipipe_handle_irq(irq, &regs);
ipipe_trace_irq_exit(irq);
#else /* !CONFIG_IPIPE */
generic_handle_irq(irq);
#endif /* !CONFIG_IPIPE */
}
#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
static int mac_stat_int_mask;
static void bfin_mac_status_ack_irq(unsigned int irq)
{
switch (irq) {
case IRQ_MAC_MMCINT:
bfin_write_EMAC_MMC_TIRQS(
bfin_read_EMAC_MMC_TIRQE() &
bfin_read_EMAC_MMC_TIRQS());
bfin_write_EMAC_MMC_RIRQS(
bfin_read_EMAC_MMC_RIRQE() &
bfin_read_EMAC_MMC_RIRQS());
break;
case IRQ_MAC_RXFSINT:
bfin_write_EMAC_RX_STKY(
bfin_read_EMAC_RX_IRQE() &
bfin_read_EMAC_RX_STKY());
break;
case IRQ_MAC_TXFSINT:
bfin_write_EMAC_TX_STKY(
bfin_read_EMAC_TX_IRQE() &
bfin_read_EMAC_TX_STKY());
break;
case IRQ_MAC_WAKEDET:
bfin_write_EMAC_WKUP_CTL(
bfin_read_EMAC_WKUP_CTL() | MPKS | RWKS);
break;
default:
/* These bits are W1C */
bfin_write_EMAC_SYSTAT(1L << (irq - IRQ_MAC_PHYINT));
break;
}
}
static void bfin_mac_status_mask_irq(struct irq_data *d)
{
unsigned int irq = d->irq;
mac_stat_int_mask &= ~(1L << (irq - IRQ_MAC_PHYINT));
#ifdef BF537_FAMILY
switch (irq) {
case IRQ_MAC_PHYINT:
bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() & ~PHYIE);
break;
default:
break;
}
#else
if (!mac_stat_int_mask)
bfin_internal_mask_irq(IRQ_MAC_ERROR);
#endif
bfin_mac_status_ack_irq(irq);
}
static void bfin_mac_status_unmask_irq(struct irq_data *d)
{
unsigned int irq = d->irq;
#ifdef BF537_FAMILY
switch (irq) {
case IRQ_MAC_PHYINT:
bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() | PHYIE);
break;
default:
break;
}
#else
if (!mac_stat_int_mask)
bfin_internal_unmask_irq(IRQ_MAC_ERROR);
#endif
mac_stat_int_mask |= 1L << (irq - IRQ_MAC_PHYINT);
}
#ifdef CONFIG_PM
int bfin_mac_status_set_wake(struct irq_data *d, unsigned int state)
{
#ifdef BF537_FAMILY
return bfin_internal_set_wake(IRQ_GENERIC_ERROR, state);
#else
return bfin_internal_set_wake(IRQ_MAC_ERROR, state);
#endif
}
#else
# define bfin_mac_status_set_wake NULL
#endif
static struct irq_chip bfin_mac_status_irqchip = {
.name = "MACST",
.irq_ack = bfin_ack_noop,
.irq_mask_ack = bfin_mac_status_mask_irq,
.irq_mask = bfin_mac_status_mask_irq,
.irq_unmask = bfin_mac_status_unmask_irq,
.irq_set_wake = bfin_mac_status_set_wake,
};
void bfin_demux_mac_status_irq(unsigned int int_err_irq,
struct irq_desc *inta_desc)
{
int i, irq = 0;
u32 status = bfin_read_EMAC_SYSTAT();
for (i = 0; i <= (IRQ_MAC_STMDONE - IRQ_MAC_PHYINT); i++)
if (status & (1L << i)) {
irq = IRQ_MAC_PHYINT + i;
break;
}
if (irq) {
if (mac_stat_int_mask & (1L << (irq - IRQ_MAC_PHYINT))) {
bfin_handle_irq(irq);
} else {
bfin_mac_status_ack_irq(irq);
pr_debug("IRQ %d:"
" MASKED MAC ERROR INTERRUPT ASSERTED\n",
irq);
}
} else
printk(KERN_ERR
"%s : %s : LINE %d :\nIRQ ?: MAC ERROR"
" INTERRUPT ASSERTED BUT NO SOURCE FOUND"
"(EMAC_SYSTAT=0x%X)\n",
__func__, __FILE__, __LINE__, status);
}
#endif
static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
{
#ifdef CONFIG_IPIPE
handle = handle_level_irq;
#endif
__irq_set_handler_locked(irq, handle);
}
static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
extern void bfin_gpio_irq_prepare(unsigned gpio);
#if !defined(CONFIG_BF54x)
static void bfin_gpio_ack_irq(struct irq_data *d)
{
/* AFAIK ack_irq in case mask_ack is provided
* get's only called for edge sense irqs
*/
set_gpio_data(irq_to_gpio(d->irq), 0);
}
static void bfin_gpio_mask_ack_irq(struct irq_data *d)
{
unsigned int irq = d->irq;
u32 gpionr = irq_to_gpio(irq);
if (!irqd_is_level_type(d))
set_gpio_data(gpionr, 0);
set_gpio_maska(gpionr, 0);
}
static void bfin_gpio_mask_irq(struct irq_data *d)
{
set_gpio_maska(irq_to_gpio(d->irq), 0);
}
static void bfin_gpio_unmask_irq(struct irq_data *d)
{
set_gpio_maska(irq_to_gpio(d->irq), 1);
}
static unsigned int bfin_gpio_irq_startup(struct irq_data *d)
{
u32 gpionr = irq_to_gpio(d->irq);
if (__test_and_set_bit(gpionr, gpio_enabled))
bfin_gpio_irq_prepare(gpionr);
bfin_gpio_unmask_irq(d);
return 0;
}
static void bfin_gpio_irq_shutdown(struct irq_data *d)
{
u32 gpionr = irq_to_gpio(d->irq);
bfin_gpio_mask_irq(d);
__clear_bit(gpionr, gpio_enabled);
bfin_gpio_irq_free(gpionr);
}
static int bfin_gpio_irq_type(struct irq_data *d, unsigned int type)
{
unsigned int irq = d->irq;
int ret;
char buf[16];
u32 gpionr = irq_to_gpio(irq);
if (type == IRQ_TYPE_PROBE) {
/* only probe unenabled GPIO interrupt lines */
if (test_bit(gpionr, gpio_enabled))
return 0;
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
snprintf(buf, 16, "gpio-irq%d", irq);
ret = bfin_gpio_irq_request(gpionr, buf);
if (ret)
return ret;
if (__test_and_set_bit(gpionr, gpio_enabled))
bfin_gpio_irq_prepare(gpionr);
} else {
__clear_bit(gpionr, gpio_enabled);
return 0;
}
set_gpio_inen(gpionr, 0);
set_gpio_dir(gpionr, 0);
if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
== (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
set_gpio_both(gpionr, 1);
else
set_gpio_both(gpionr, 0);
if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
set_gpio_polar(gpionr, 1); /* low or falling edge denoted by one */
else
set_gpio_polar(gpionr, 0); /* high or rising edge denoted by zero */
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
set_gpio_edge(gpionr, 1);
set_gpio_inen(gpionr, 1);
set_gpio_data(gpionr, 0);
} else {
set_gpio_edge(gpionr, 0);
set_gpio_inen(gpionr, 1);
}
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
bfin_set_irq_handler(irq, handle_edge_irq);
else
bfin_set_irq_handler(irq, handle_level_irq);
return 0;
}
#ifdef CONFIG_PM
static int bfin_gpio_set_wake(struct irq_data *d, unsigned int state)
{
return gpio_pm_wakeup_ctrl(irq_to_gpio(d->irq), state);
}
#else
# define bfin_gpio_set_wake NULL
#endif
static void bfin_demux_gpio_block(unsigned int irq)
{
unsigned int gpio, mask;
gpio = irq_to_gpio(irq);
mask = get_gpiop_data(gpio) & get_gpiop_maska(gpio);
while (mask) {
if (mask & 1)
bfin_handle_irq(irq);
irq++;
mask >>= 1;
}
}
static void bfin_demux_gpio_irq(unsigned int inta_irq,
struct irq_desc *desc)
{
unsigned int irq;
switch (inta_irq) {
#if defined(BF537_FAMILY)
case IRQ_PROG_INTA:
bfin_demux_gpio_block(IRQ_PF0);
irq = IRQ_PG0;
break;
# if !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
case IRQ_MAC_RX:
irq = IRQ_PH0;
break;
# endif
#elif defined(BF533_FAMILY)
case IRQ_PROG_INTA:
irq = IRQ_PF0;
break;
#elif defined(BF538_FAMILY)
case IRQ_PORTF_INTA:
irq = IRQ_PF0;
break;
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
case IRQ_PORTF_INTA:
irq = IRQ_PF0;
break;
case IRQ_PORTG_INTA:
irq = IRQ_PG0;
break;
case IRQ_PORTH_INTA:
irq = IRQ_PH0;
break;
#elif defined(CONFIG_BF561)
case IRQ_PROG0_INTA:
irq = IRQ_PF0;
break;
case IRQ_PROG1_INTA:
irq = IRQ_PF16;
break;
case IRQ_PROG2_INTA:
irq = IRQ_PF32;
break;
#endif
default:
BUG();
return;
}
bfin_demux_gpio_block(irq);
}
#else /* CONFIG_BF54x */
#define NR_PINT_SYS_IRQS 4
#define NR_PINT_BITS 32
#define NR_PINTS 160
#define IRQ_NOT_AVAIL 0xFF
#define PINT_2_BANK(x) ((x) >> 5)
#define PINT_2_BIT(x) ((x) & 0x1F)
#define PINT_BIT(x) (1 << (PINT_2_BIT(x)))
static unsigned char irq2pint_lut[NR_PINTS];
static unsigned char pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
struct pin_int_t {
unsigned int mask_set;
unsigned int mask_clear;
unsigned int request;
unsigned int assign;
unsigned int edge_set;
unsigned int edge_clear;
unsigned int invert_set;
unsigned int invert_clear;
unsigned int pinstate;
unsigned int latch;
};
static struct pin_int_t *pint[NR_PINT_SYS_IRQS] = {
(struct pin_int_t *)PINT0_MASK_SET,
(struct pin_int_t *)PINT1_MASK_SET,
(struct pin_int_t *)PINT2_MASK_SET,
(struct pin_int_t *)PINT3_MASK_SET,
};
inline unsigned int get_irq_base(u32 bank, u8 bmap)
{
unsigned int irq_base;
if (bank < 2) { /*PA-PB */
irq_base = IRQ_PA0 + bmap * 16;
} else { /*PC-PJ */
irq_base = IRQ_PC0 + bmap * 16;
}
return irq_base;
}
/* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
void init_pint_lut(void)
{
u16 bank, bit, irq_base, bit_pos;
u32 pint_assign;
u8 bmap;
memset(irq2pint_lut, IRQ_NOT_AVAIL, sizeof(irq2pint_lut));
for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++) {
pint_assign = pint[bank]->assign;
for (bit = 0; bit < NR_PINT_BITS; bit++) {
bmap = (pint_assign >> ((bit / 8) * 8)) & 0xFF;
irq_base = get_irq_base(bank, bmap);
irq_base += (bit % 8) + ((bit / 8) & 1 ? 8 : 0);
bit_pos = bit + bank * NR_PINT_BITS;
pint2irq_lut[bit_pos] = irq_base - SYS_IRQS;
irq2pint_lut[irq_base - SYS_IRQS] = bit_pos;
}
}
}
static void bfin_gpio_ack_irq(struct irq_data *d)
{
u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
u32 pintbit = PINT_BIT(pint_val);
u32 bank = PINT_2_BANK(pint_val);
if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
if (pint[bank]->invert_set & pintbit)
pint[bank]->invert_clear = pintbit;
else
pint[bank]->invert_set = pintbit;
}
pint[bank]->request = pintbit;
}
static void bfin_gpio_mask_ack_irq(struct irq_data *d)
{
u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
u32 pintbit = PINT_BIT(pint_val);
u32 bank = PINT_2_BANK(pint_val);
if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
if (pint[bank]->invert_set & pintbit)
pint[bank]->invert_clear = pintbit;
else
pint[bank]->invert_set = pintbit;
}
pint[bank]->request = pintbit;
pint[bank]->mask_clear = pintbit;
}
static void bfin_gpio_mask_irq(struct irq_data *d)
{
u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
}
static void bfin_gpio_unmask_irq(struct irq_data *d)
{
u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
u32 pintbit = PINT_BIT(pint_val);
u32 bank = PINT_2_BANK(pint_val);
pint[bank]->mask_set = pintbit;
}
static unsigned int bfin_gpio_irq_startup(struct irq_data *d)
{
unsigned int irq = d->irq;
u32 gpionr = irq_to_gpio(irq);
u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
if (pint_val == IRQ_NOT_AVAIL) {
printk(KERN_ERR
"GPIO IRQ %d :Not in PINT Assign table "
"Reconfigure Interrupt to Port Assignemt\n", irq);
return -ENODEV;
}
if (__test_and_set_bit(gpionr, gpio_enabled))
bfin_gpio_irq_prepare(gpionr);
bfin_gpio_unmask_irq(d);
return 0;
}
static void bfin_gpio_irq_shutdown(struct irq_data *d)
{
u32 gpionr = irq_to_gpio(d->irq);
bfin_gpio_mask_irq(d);
__clear_bit(gpionr, gpio_enabled);
bfin_gpio_irq_free(gpionr);
}
static int bfin_gpio_irq_type(struct irq_data *d, unsigned int type)
{
unsigned int irq = d->irq;
int ret;
char buf[16];
u32 gpionr = irq_to_gpio(irq);
u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
u32 pintbit = PINT_BIT(pint_val);
u32 bank = PINT_2_BANK(pint_val);
if (pint_val == IRQ_NOT_AVAIL)
return -ENODEV;
if (type == IRQ_TYPE_PROBE) {
/* only probe unenabled GPIO interrupt lines */
if (test_bit(gpionr, gpio_enabled))
return 0;
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
snprintf(buf, 16, "gpio-irq%d", irq);
ret = bfin_gpio_irq_request(gpionr, buf);
if (ret)
return ret;
if (__test_and_set_bit(gpionr, gpio_enabled))
bfin_gpio_irq_prepare(gpionr);
} else {
__clear_bit(gpionr, gpio_enabled);
return 0;
}
if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
pint[bank]->invert_set = pintbit; /* low or falling edge denoted by one */
else
pint[bank]->invert_clear = pintbit; /* high or rising edge denoted by zero */
if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
== (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
if (gpio_get_value(gpionr))
pint[bank]->invert_set = pintbit;
else
pint[bank]->invert_clear = pintbit;
}
if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
pint[bank]->edge_set = pintbit;
bfin_set_irq_handler(irq, handle_edge_irq);
} else {
pint[bank]->edge_clear = pintbit;
bfin_set_irq_handler(irq, handle_level_irq);
}
return 0;
}
#ifdef CONFIG_PM
static int bfin_gpio_set_wake(struct irq_data *d, unsigned int state)
{
u32 pint_irq;
u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
u32 bank = PINT_2_BANK(pint_val);
switch (bank) {
case 0:
pint_irq = IRQ_PINT0;
break;
case 2:
pint_irq = IRQ_PINT2;
break;
case 3:
pint_irq = IRQ_PINT3;
break;
case 1:
pint_irq = IRQ_PINT1;
break;
default:
return -EINVAL;
}
bfin_internal_set_wake(pint_irq, state);
return 0;
}
#else
# define bfin_gpio_set_wake NULL
#endif
static void bfin_demux_gpio_irq(unsigned int inta_irq,
struct irq_desc *desc)
{
u32 bank, pint_val;
u32 request, irq;
switch (inta_irq) {
case IRQ_PINT0:
bank = 0;
break;
case IRQ_PINT2:
bank = 2;
break;
case IRQ_PINT3:
bank = 3;
break;
case IRQ_PINT1:
bank = 1;
break;
default:
return;
}
pint_val = bank * NR_PINT_BITS;
request = pint[bank]->request;
while (request) {
if (request & 1) {
irq = pint2irq_lut[pint_val] + SYS_IRQS;
bfin_handle_irq(irq);
}
pint_val++;
request >>= 1;
}
}
#endif
static struct irq_chip bfin_gpio_irqchip = {
.name = "GPIO",
.irq_ack = bfin_gpio_ack_irq,
.irq_mask = bfin_gpio_mask_irq,
.irq_mask_ack = bfin_gpio_mask_ack_irq,
.irq_unmask = bfin_gpio_unmask_irq,
.irq_disable = bfin_gpio_mask_irq,
.irq_enable = bfin_gpio_unmask_irq,
.irq_set_type = bfin_gpio_irq_type,
.irq_startup = bfin_gpio_irq_startup,
.irq_shutdown = bfin_gpio_irq_shutdown,
.irq_set_wake = bfin_gpio_set_wake,
};
void __cpuinit init_exception_vectors(void)
{
/* cannot program in software:
* evt0 - emulation (jtag)
* evt1 - reset
*/
bfin_write_EVT2(evt_nmi);
bfin_write_EVT3(trap);
bfin_write_EVT5(evt_ivhw);
bfin_write_EVT6(evt_timer);
bfin_write_EVT7(evt_evt7);
bfin_write_EVT8(evt_evt8);
bfin_write_EVT9(evt_evt9);
bfin_write_EVT10(evt_evt10);
bfin_write_EVT11(evt_evt11);
bfin_write_EVT12(evt_evt12);
bfin_write_EVT13(evt_evt13);
bfin_write_EVT14(evt_evt14);
bfin_write_EVT15(evt_system_call);
CSYNC();
}
/*
* This function should be called during kernel startup to initialize
* the BFin IRQ handling routines.
*/
int __init init_arch_irq(void)
{
int irq;
unsigned long ilat = 0;
/* Disable all the peripheral intrs - page 4-29 HW Ref manual */
#ifdef SIC_IMASK0
bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
# ifdef SIC_IMASK2
bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
# endif
# ifdef CONFIG_SMP
bfin_write_SICB_IMASK0(SIC_UNMASK_ALL);
bfin_write_SICB_IMASK1(SIC_UNMASK_ALL);
# endif
#else
bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
#endif
local_irq_disable();
#ifdef CONFIG_BF54x
# ifdef CONFIG_PINTx_REASSIGN
pint[0]->assign = CONFIG_PINT0_ASSIGN;
pint[1]->assign = CONFIG_PINT1_ASSIGN;
pint[2]->assign = CONFIG_PINT2_ASSIGN;
pint[3]->assign = CONFIG_PINT3_ASSIGN;
# endif
/* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
init_pint_lut();
#endif
for (irq = 0; irq <= SYS_IRQS; irq++) {
if (irq <= IRQ_CORETMR)
irq_set_chip(irq, &bfin_core_irqchip);
else
irq_set_chip(irq, &bfin_internal_irqchip);
switch (irq) {
#if defined(CONFIG_BF53x)
case IRQ_PROG_INTA:
# if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
case IRQ_MAC_RX:
# endif
#elif defined(CONFIG_BF54x)
case IRQ_PINT0:
case IRQ_PINT1:
case IRQ_PINT2:
case IRQ_PINT3:
#elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
case IRQ_PORTF_INTA:
case IRQ_PORTG_INTA:
case IRQ_PORTH_INTA:
#elif defined(CONFIG_BF561)
case IRQ_PROG0_INTA:
case IRQ_PROG1_INTA:
case IRQ_PROG2_INTA:
#elif defined(BF538_FAMILY)
case IRQ_PORTF_INTA:
#endif
irq_set_chained_handler(irq, bfin_demux_gpio_irq);
break;
#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
case IRQ_MAC_ERROR:
irq_set_chained_handler(irq,
bfin_demux_mac_status_irq);
break;
#endif
#ifdef CONFIG_SMP
case IRQ_SUPPLE_0:
case IRQ_SUPPLE_1:
irq_set_handler(irq, handle_percpu_irq);
break;
#endif
#ifdef CONFIG_TICKSOURCE_CORETMR
case IRQ_CORETMR:
# ifdef CONFIG_SMP
irq_set_handler(irq, handle_percpu_irq);
# else
irq_set_handler(irq, handle_simple_irq);
# endif
break;
#endif
#ifdef CONFIG_TICKSOURCE_GPTMR0
case IRQ_TIMER0:
irq_set_handler(irq, handle_simple_irq);
break;
#endif
default:
#ifdef CONFIG_IPIPE
irq_set_handler(irq, handle_level_irq);
#else
irq_set_handler(irq, handle_simple_irq);
#endif
break;
}
}
init_mach_irq();
#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
for (irq = IRQ_MAC_PHYINT; irq <= IRQ_MAC_STMDONE; irq++)
irq_set_chip_and_handler(irq, &bfin_mac_status_irqchip,
handle_level_irq);
#endif
/* if configured as edge, then will be changed to do_edge_IRQ */
for (irq = GPIO_IRQ_BASE;
irq < (GPIO_IRQ_BASE + MAX_BLACKFIN_GPIOS); irq++)
irq_set_chip_and_handler(irq, &bfin_gpio_irqchip,
handle_level_irq);
bfin_write_IMASK(0);
CSYNC();
ilat = bfin_read_ILAT();
CSYNC();
bfin_write_ILAT(ilat);
CSYNC();
printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
/* IMASK=xxx is equivalent to STI xx or bfin_irq_flags=xx,
* local_irq_enable()
*/
program_IAR();
/* Therefore it's better to setup IARs before interrupts enabled */
search_IAR();
/* Enable interrupts IVG7-15 */
bfin_irq_flags |= IMASK_IVG15 |
IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
/* This implicitly covers ANOMALY_05000171
* Boot-ROM code modifies SICA_IWRx wakeup registers
*/
#ifdef SIC_IWR0
bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
# ifdef SIC_IWR1
/* BF52x/BF51x system reset does not properly reset SIC_IWR1 which
* will screw up the bootrom as it relies on MDMA0/1 waking it
* up from IDLE instructions. See this report for more info:
* http://blackfin.uclinux.org/gf/tracker/4323
*/
if (ANOMALY_05000435)
bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
else
bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
# endif
# ifdef SIC_IWR2
bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
# endif
#else
bfin_write_SIC_IWR(IWR_DISABLE_ALL);
#endif
return 0;
}
#ifdef CONFIG_DO_IRQ_L1
__attribute__((l1_text))
#endif
static int vec_to_irq(int vec)
{
struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
unsigned long sic_status[3];
if (likely(vec == EVT_IVTMR_P))
return IRQ_CORETMR;
#ifdef SIC_ISR
sic_status[0] = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
#else
if (smp_processor_id()) {
# ifdef SICB_ISR0
/* This will be optimized out in UP mode. */
sic_status[0] = bfin_read_SICB_ISR0() & bfin_read_SICB_IMASK0();
sic_status[1] = bfin_read_SICB_ISR1() & bfin_read_SICB_IMASK1();
# endif
} else {
sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
}
#endif
#ifdef SIC_ISR2
sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
#endif
for (;; ivg++) {
if (ivg >= ivg_stop)
return -1;
#ifdef SIC_ISR
if (sic_status[0] & ivg->isrflag)
#else
if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
#endif
return ivg->irqno;
}
}
#ifdef CONFIG_DO_IRQ_L1
__attribute__((l1_text))
#endif
void do_irq(int vec, struct pt_regs *fp)
{
int irq = vec_to_irq(vec);
if (irq == -1)
return;
asm_do_IRQ(irq, fp);
}
#ifdef CONFIG_IPIPE
int __ipipe_get_irq_priority(unsigned irq)
{
int ient, prio;
if (irq <= IRQ_CORETMR)
return irq;
for (ient = 0; ient < NR_PERI_INTS; ient++) {
struct ivgx *ivg = ivg_table + ient;
if (ivg->irqno == irq) {
for (prio = 0; prio <= IVG13-IVG7; prio++) {
if (ivg7_13[prio].ifirst <= ivg &&
ivg7_13[prio].istop > ivg)
return IVG7 + prio;
}
}
}
return IVG15;
}
/* Hw interrupts are disabled on entry (check SAVE_CONTEXT). */
#ifdef CONFIG_DO_IRQ_L1
__attribute__((l1_text))
#endif
asmlinkage int __ipipe_grab_irq(int vec, struct pt_regs *regs)
{
struct ipipe_percpu_domain_data *p = ipipe_root_cpudom_ptr();
struct ipipe_domain *this_domain = __ipipe_current_domain;
struct ivgx *ivg_stop = ivg7_13[vec-IVG7].istop;
struct ivgx *ivg = ivg7_13[vec-IVG7].ifirst;
int irq, s = 0;
irq = vec_to_irq(vec);
if (irq == -1)
return 0;
if (irq == IRQ_SYSTMR) {
#if !defined(CONFIG_GENERIC_CLOCKEVENTS) || defined(CONFIG_TICKSOURCE_GPTMR0)
bfin_write_TIMER_STATUS(1); /* Latch TIMIL0 */
#endif
/* This is basically what we need from the register frame. */
__raw_get_cpu_var(__ipipe_tick_regs).ipend = regs->ipend;
__raw_get_cpu_var(__ipipe_tick_regs).pc = regs->pc;
if (this_domain != ipipe_root_domain)
__raw_get_cpu_var(__ipipe_tick_regs).ipend &= ~0x10;
else
__raw_get_cpu_var(__ipipe_tick_regs).ipend |= 0x10;
}
/*
* We don't want Linux interrupt handlers to run at the
* current core priority level (i.e. < EVT15), since this
* might delay other interrupts handled by a high priority
* domain. Here is what we do instead:
*
* - we raise the SYNCDEFER bit to prevent
* __ipipe_handle_irq() to sync the pipeline for the root
* stage for the incoming interrupt. Upon return, that IRQ is
* pending in the interrupt log.
*
* - we raise the TIF_IRQ_SYNC bit for the current thread, so
* that _schedule_and_signal_from_int will eventually sync the
* pipeline from EVT15.
*/
if (this_domain == ipipe_root_domain) {
s = __test_and_set_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
barrier();
}
ipipe_trace_irq_entry(irq);
__ipipe_handle_irq(irq, regs);
ipipe_trace_irq_exit(irq);
if (user_mode(regs) &&
!ipipe_test_foreign_stack() &&
(current->ipipe_flags & PF_EVTRET) != 0) {
/*
* Testing for user_regs() does NOT fully eliminate
* foreign stack contexts, because of the forged
* interrupt returns we do through
* __ipipe_call_irqtail. In that case, we might have
* preempted a foreign stack context in a high
* priority domain, with a single interrupt level now
* pending after the irqtail unwinding is done. In
* which case user_mode() is now true, and the event
* gets dispatched spuriously.
*/
current->ipipe_flags &= ~PF_EVTRET;
__ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
}
if (this_domain == ipipe_root_domain) {
set_thread_flag(TIF_IRQ_SYNC);
if (!s) {
__clear_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
return !test_bit(IPIPE_STALL_FLAG, &p->status);
}
}
return 0;
}
#endif /* CONFIG_IPIPE */
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