diff options
Diffstat (limited to 'arch/mips/pnx833x/common/interrupts.c')
| -rw-r--r-- | arch/mips/pnx833x/common/interrupts.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/arch/mips/pnx833x/common/interrupts.c b/arch/mips/pnx833x/common/interrupts.c new file mode 100644 index 000000000..e46086587 --- /dev/null +++ b/arch/mips/pnx833x/common/interrupts.c @@ -0,0 +1,316 @@ +/* + * 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; +} |