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linux-stable/arch/mips/pnx833x/common/interrupts.c
Paul Gortmaker 078a55fc82 MIPS: Delete __cpuinit/__CPUINIT usage from MIPS code 
commit 3747069b25e419f6b51395f48127e9812abc3596 upstream.

The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications.  For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.

After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out.  Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.

Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
and are flagged as __cpuinit  -- so if we remove the __cpuinit from
the arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
related content into no-ops as early as possible, since that will get
rid of these warnings.  In any case, they are temporary and harmless.

Here, we remove all the MIPS __cpuinit from C code and __CPUINIT
from asm files.  MIPS is interesting in this respect, because there
are also uasm users hiding behind their own renamed versions of the
__cpuinit macros.

[1] https://lkml.org/lkml/2013/5/20/589

[ralf@linux-mips.org: Folded in Paul's followup fix.]

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5494/
Patchwork: https://patchwork.linux-mips.org/patch/5495/
Patchwork: https://patchwork.linux-mips.org/patch/5509/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2013-07-14 19:36:51 -04:00

316 lines
9.5 KiB
C
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/*
* interrupts.c: Interrupt mappings for PNX833X.
*
* Copyright 2008 NXP Semiconductors
* Chris Steel <chris.steel@nxp.com>
* Daniel Laird <daniel.j.laird@nxp.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <asm/mipsregs.h>
#include <asm/irq_cpu.h>
#include <asm/setup.h>
#include <irq.h>
#include <irq-mapping.h>
#include <gpio.h>
static int mips_cpu_timer_irq;
static const unsigned int irq_prio[PNX833X_PIC_NUM_IRQ] =
{
0, /* unused */
4, /* PNX833X_PIC_I2C0_INT 1 */
4, /* PNX833X_PIC_I2C1_INT 2 */
1, /* PNX833X_PIC_UART0_INT 3 */
1, /* PNX833X_PIC_UART1_INT 4 */
6, /* PNX833X_PIC_TS_IN0_DV_INT 5 */
6, /* PNX833X_PIC_TS_IN0_DMA_INT 6 */
7, /* PNX833X_PIC_GPIO_INT 7 */
4, /* PNX833X_PIC_AUDIO_DEC_INT 8 */
5, /* PNX833X_PIC_VIDEO_DEC_INT 9 */
4, /* PNX833X_PIC_CONFIG_INT 10 */
4, /* PNX833X_PIC_AOI_INT 11 */
9, /* PNX833X_PIC_SYNC_INT 12 */
9, /* PNX8335_PIC_SATA_INT 13 */
4, /* PNX833X_PIC_OSD_INT 14 */
9, /* PNX833X_PIC_DISP1_INT 15 */
4, /* PNX833X_PIC_DEINTERLACER_INT 16 */
9, /* PNX833X_PIC_DISPLAY2_INT 17 */
4, /* PNX833X_PIC_VC_INT 18 */
4, /* PNX833X_PIC_SC_INT 19 */
9, /* PNX833X_PIC_IDE_INT 20 */
9, /* PNX833X_PIC_IDE_DMA_INT 21 */
6, /* PNX833X_PIC_TS_IN1_DV_INT 22 */
6, /* PNX833X_PIC_TS_IN1_DMA_INT 23 */
4, /* PNX833X_PIC_SGDX_DMA_INT 24 */
4, /* PNX833X_PIC_TS_OUT_INT 25 */
4, /* PNX833X_PIC_IR_INT 26 */
3, /* PNX833X_PIC_VMSP1_INT 27 */
3, /* PNX833X_PIC_VMSP2_INT 28 */
4, /* PNX833X_PIC_PIBC_INT 29 */
4, /* PNX833X_PIC_TS_IN0_TRD_INT 30 */
4, /* PNX833X_PIC_SGDX_TPD_INT 31 */
5, /* PNX833X_PIC_USB_INT 32 */
4, /* PNX833X_PIC_TS_IN1_TRD_INT 33 */
4, /* PNX833X_PIC_CLOCK_INT 34 */
4, /* PNX833X_PIC_SGDX_PARSER_INT 35 */
4, /* PNX833X_PIC_VMSP_DMA_INT 36 */
#if defined(CONFIG_SOC_PNX8335)
4, /* PNX8335_PIC_MIU_INT 37 */
4, /* PNX8335_PIC_AVCHIP_IRQ_INT 38 */
9, /* PNX8335_PIC_SYNC_HD_INT 39 */
9, /* PNX8335_PIC_DISP_HD_INT 40 */
9, /* PNX8335_PIC_DISP_SCALER_INT 41 */
4, /* PNX8335_PIC_OSD_HD1_INT 42 */
4, /* PNX8335_PIC_DTL_WRITER_Y_INT 43 */
4, /* PNX8335_PIC_DTL_WRITER_C_INT 44 */
4, /* PNX8335_PIC_DTL_EMULATOR_Y_IR_INT 45 */
4, /* PNX8335_PIC_DTL_EMULATOR_C_IR_INT 46 */
4, /* PNX8335_PIC_DENC_TTX_INT 47 */
4, /* PNX8335_PIC_MMI_SIF0_INT 48 */
4, /* PNX8335_PIC_MMI_SIF1_INT 49 */
4, /* PNX8335_PIC_MMI_CDMMU_INT 50 */
4, /* PNX8335_PIC_PIBCS_INT 51 */
12, /* PNX8335_PIC_ETHERNET_INT 52 */
3, /* PNX8335_PIC_VMSP1_0_INT 53 */
3, /* PNX8335_PIC_VMSP1_1_INT 54 */
4, /* PNX8335_PIC_VMSP1_DMA_INT 55 */
4, /* PNX8335_PIC_TDGR_DE_INT 56 */
4, /* PNX8335_PIC_IR1_IRQ_INT 57 */
#endif
};
static void pnx833x_timer_dispatch(void)
{
do_IRQ(mips_cpu_timer_irq);
}
static void pic_dispatch(void)
{
unsigned int irq = PNX833X_REGFIELD(PIC_INT_SRC, INT_SRC);
if ((irq >= 1) && (irq < (PNX833X_PIC_NUM_IRQ))) {
unsigned long priority = PNX833X_PIC_INT_PRIORITY;
PNX833X_PIC_INT_PRIORITY = irq_prio[irq];
if (irq == PNX833X_PIC_GPIO_INT) {
unsigned long mask = PNX833X_PIO_INT_STATUS & PNX833X_PIO_INT_ENABLE;
int pin;
while ((pin = ffs(mask & 0xffff))) {
pin -= 1;
do_IRQ(PNX833X_GPIO_IRQ_BASE + pin);
mask &= ~(1 << pin);
}
} else {
do_IRQ(irq + PNX833X_PIC_IRQ_BASE);
}
PNX833X_PIC_INT_PRIORITY = priority;
} else {
printk(KERN_ERR "plat_irq_dispatch: unexpected irq %u\n", irq);
}
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int pending = read_c0_status() & read_c0_cause();
if (pending & STATUSF_IP4)
pic_dispatch();
else if (pending & STATUSF_IP7)
do_IRQ(PNX833X_TIMER_IRQ);
else
spurious_interrupt();
}
static inline void pnx833x_hard_enable_pic_irq(unsigned int irq)
{
/* Currently we do this by setting IRQ priority to 1.
If priority support is being implemented, 1 should be repalced
by a better value. */
PNX833X_PIC_INT_REG(irq) = irq_prio[irq];
}
static inline void pnx833x_hard_disable_pic_irq(unsigned int irq)
{
/* Disable IRQ by writing setting it's priority to 0 */
PNX833X_PIC_INT_REG(irq) = 0;
}
static DEFINE_RAW_SPINLOCK(pnx833x_irq_lock);
static unsigned int pnx833x_startup_pic_irq(unsigned int irq)
{
unsigned long flags;
unsigned int pic_irq = irq - PNX833X_PIC_IRQ_BASE;
raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
pnx833x_hard_enable_pic_irq(pic_irq);
raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
return 0;
}
static void pnx833x_enable_pic_irq(struct irq_data *d)
{
unsigned long flags;
unsigned int pic_irq = d->irq - PNX833X_PIC_IRQ_BASE;
raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
pnx833x_hard_enable_pic_irq(pic_irq);
raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
}
static void pnx833x_disable_pic_irq(struct irq_data *d)
{
unsigned long flags;
unsigned int pic_irq = d->irq - PNX833X_PIC_IRQ_BASE;
raw_spin_lock_irqsave(&pnx833x_irq_lock, flags);
pnx833x_hard_disable_pic_irq(pic_irq);
raw_spin_unlock_irqrestore(&pnx833x_irq_lock, flags);
}
static DEFINE_RAW_SPINLOCK(pnx833x_gpio_pnx833x_irq_lock);
static void pnx833x_enable_gpio_irq(struct irq_data *d)
{
int pin = d->irq - PNX833X_GPIO_IRQ_BASE;
unsigned long flags;
raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
pnx833x_gpio_enable_irq(pin);
raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
}
static void pnx833x_disable_gpio_irq(struct irq_data *d)
{
int pin = d->irq - PNX833X_GPIO_IRQ_BASE;
unsigned long flags;
raw_spin_lock_irqsave(&pnx833x_gpio_pnx833x_irq_lock, flags);
pnx833x_gpio_disable_irq(pin);
raw_spin_unlock_irqrestore(&pnx833x_gpio_pnx833x_irq_lock, flags);
}
static int pnx833x_set_type_gpio_irq(struct irq_data *d, unsigned int flow_type)
{
int pin = d->irq - PNX833X_GPIO_IRQ_BASE;
int gpio_mode;
switch (flow_type) {
case IRQ_TYPE_EDGE_RISING:
gpio_mode = GPIO_INT_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
gpio_mode = GPIO_INT_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
gpio_mode = GPIO_INT_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
gpio_mode = GPIO_INT_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
gpio_mode = GPIO_INT_LEVEL_LOW;
break;
default:
gpio_mode = GPIO_INT_NONE;
break;
}
pnx833x_gpio_setup_irq(gpio_mode, pin);
return 0;
}
static struct irq_chip pnx833x_pic_irq_type = {
.name = "PNX-PIC",
.irq_enable = pnx833x_enable_pic_irq,
.irq_disable = pnx833x_disable_pic_irq,
};
static struct irq_chip pnx833x_gpio_irq_type = {
.name = "PNX-GPIO",
.irq_enable = pnx833x_enable_gpio_irq,
.irq_disable = pnx833x_disable_gpio_irq,
.irq_set_type = pnx833x_set_type_gpio_irq,
};
void __init arch_init_irq(void)
{
unsigned int irq;
/* setup standard internal cpu irqs */
mips_cpu_irq_init();
/* Set IRQ information in irq_desc */
for (irq = PNX833X_PIC_IRQ_BASE; irq < (PNX833X_PIC_IRQ_BASE + PNX833X_PIC_NUM_IRQ); irq++) {
pnx833x_hard_disable_pic_irq(irq);
irq_set_chip_and_handler(irq, &pnx833x_pic_irq_type,
handle_simple_irq);
}
for (irq = PNX833X_GPIO_IRQ_BASE; irq < (PNX833X_GPIO_IRQ_BASE + PNX833X_GPIO_NUM_IRQ); irq++)
irq_set_chip_and_handler(irq, &pnx833x_gpio_irq_type,
handle_simple_irq);
/* Set PIC priority limiter register to 0 */
PNX833X_PIC_INT_PRIORITY = 0;
/* Setup GPIO IRQ dispatching */
pnx833x_startup_pic_irq(PNX833X_PIC_GPIO_INT);
/* Enable PIC IRQs (HWIRQ2) */
if (cpu_has_vint)
set_vi_handler(4, pic_dispatch);
write_c0_status(read_c0_status() | IE_IRQ2);
}
unsigned int get_c0_compare_int(void)
{
if (cpu_has_vint)
set_vi_handler(cp0_compare_irq, pnx833x_timer_dispatch);
mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq;
return mips_cpu_timer_irq;
}
void __init plat_time_init(void)
{
/* calculate mips_hpt_frequency based on PNX833X_CLOCK_CPUCP_CTL reg */
extern unsigned long mips_hpt_frequency;
unsigned long reg = PNX833X_CLOCK_CPUCP_CTL;
if (!(PNX833X_BIT(reg, CLOCK_CPUCP_CTL, EXIT_RESET))) {
/* Functional clock is disabled so use crystal frequency */
mips_hpt_frequency = 25;
} else {
#if defined(CONFIG_SOC_PNX8335)
/* Functional clock is enabled, so get clock multiplier */
mips_hpt_frequency = 90 + (10 * PNX8335_REGFIELD(CLOCK_PLL_CPU_CTL, FREQ));
#else
static const unsigned long int freq[4] = {240, 160, 120, 80};
mips_hpt_frequency = freq[PNX833X_FIELD(reg, CLOCK_CPUCP_CTL, DIV_CLOCK)];
#endif
}
printk(KERN_INFO "CPU clock is %ld MHz\n", mips_hpt_frequency);
mips_hpt_frequency *= 500000;
}
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