diff options
Diffstat (limited to 'arch/arm/mach-msm/sirc.c')
| -rw-r--r-- | arch/arm/mach-msm/sirc.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/sirc.c b/arch/arm/mach-msm/sirc.c new file mode 100644 index 00000000..689e78c9 --- /dev/null +++ b/arch/arm/mach-msm/sirc.c @@ -0,0 +1,172 @@ +/* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + */ + +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <asm/irq.h> + +static unsigned int int_enable; +static unsigned int wake_enable; + +static struct sirc_regs_t sirc_regs = { + .int_enable = SPSS_SIRC_INT_ENABLE, + .int_enable_clear = SPSS_SIRC_INT_ENABLE_CLEAR, + .int_enable_set = SPSS_SIRC_INT_ENABLE_SET, + .int_type = SPSS_SIRC_INT_TYPE, + .int_polarity = SPSS_SIRC_INT_POLARITY, + .int_clear = SPSS_SIRC_INT_CLEAR, +}; + +static struct sirc_cascade_regs sirc_reg_table[] = { + { + .int_status = SPSS_SIRC_IRQ_STATUS, + .cascade_irq = INT_SIRC_0, + } +}; + +/* Mask off the given interrupt. Keep the int_enable mask in sync with + the enable reg, so it can be restored after power collapse. */ +static void sirc_irq_mask(struct irq_data *d) +{ + unsigned int mask; + + mask = 1 << (d->irq - FIRST_SIRC_IRQ); + writel(mask, sirc_regs.int_enable_clear); + int_enable &= ~mask; + return; +} + +/* Unmask the given interrupt. Keep the int_enable mask in sync with + the enable reg, so it can be restored after power collapse. */ +static void sirc_irq_unmask(struct irq_data *d) +{ + unsigned int mask; + + mask = 1 << (d->irq - FIRST_SIRC_IRQ); + writel(mask, sirc_regs.int_enable_set); + int_enable |= mask; + return; +} + +static void sirc_irq_ack(struct irq_data *d) +{ + unsigned int mask; + + mask = 1 << (d->irq - FIRST_SIRC_IRQ); + writel(mask, sirc_regs.int_clear); + return; +} + +static int sirc_irq_set_wake(struct irq_data *d, unsigned int on) +{ + unsigned int mask; + + /* Used to set the interrupt enable mask during power collapse. */ + mask = 1 << (d->irq - FIRST_SIRC_IRQ); + if (on) + wake_enable |= mask; + else + wake_enable &= ~mask; + + return 0; +} + +static int sirc_irq_set_type(struct irq_data *d, unsigned int flow_type) +{ + unsigned int mask; + unsigned int val; + + mask = 1 << (d->irq - FIRST_SIRC_IRQ); + val = readl(sirc_regs.int_polarity); + + if (flow_type & (IRQF_TRIGGER_LOW | IRQF_TRIGGER_FALLING)) + val |= mask; + else + val &= ~mask; + + writel(val, sirc_regs.int_polarity); + + val = readl(sirc_regs.int_type); + if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING)) { + val |= mask; + __irq_set_handler_locked(d->irq, handle_edge_irq); + } else { + val &= ~mask; + __irq_set_handler_locked(d->irq, handle_level_irq); + } + + writel(val, sirc_regs.int_type); + + return 0; +} + +/* Finds the pending interrupt on the passed cascade irq and redrives it */ +static void sirc_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + unsigned int reg = 0; + unsigned int sirq; + unsigned int status; + + while ((reg < ARRAY_SIZE(sirc_reg_table)) && + (sirc_reg_table[reg].cascade_irq != irq)) + reg++; + + status = readl(sirc_reg_table[reg].int_status); + status &= SIRC_MASK; + if (status == 0) + return; + + for (sirq = 0; + (sirq < NR_SIRC_IRQS) && ((status & (1U << sirq)) == 0); + sirq++) + ; + generic_handle_irq(sirq+FIRST_SIRC_IRQ); + + desc->irq_data.chip->irq_ack(&desc->irq_data); +} + +static struct irq_chip sirc_irq_chip = { + .name = "sirc", + .irq_ack = sirc_irq_ack, + .irq_mask = sirc_irq_mask, + .irq_unmask = sirc_irq_unmask, + .irq_set_wake = sirc_irq_set_wake, + .irq_set_type = sirc_irq_set_type, +}; + +void __init msm_init_sirc(void) +{ + int i; + + int_enable = 0; + wake_enable = 0; + + for (i = FIRST_SIRC_IRQ; i < LAST_SIRC_IRQ; i++) { + irq_set_chip_and_handler(i, &sirc_irq_chip, handle_edge_irq); + set_irq_flags(i, IRQF_VALID); + } + + for (i = 0; i < ARRAY_SIZE(sirc_reg_table); i++) { + irq_set_chained_handler(sirc_reg_table[i].cascade_irq, + sirc_irq_handler); + irq_set_irq_wake(sirc_reg_table[i].cascade_irq, 1); + } + return; +} + |