diff options
Diffstat (limited to 'arch/arm/mach-davinci/cp_intc.c')
| -rw-r--r-- | arch/arm/mach-davinci/cp_intc.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c deleted file mode 100644 index 94085d21018e..000000000000 --- a/arch/arm/mach-davinci/cp_intc.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - * TI Common Platform Interrupt Controller (cp_intc) driver - * - * Author: Steve Chen <schen@mvista.com> - * Copyright (C) 2008-2009, MontaVista Software, Inc. <source@mvista.com> - * - * This file is licensed under the terms of the GNU General Public License - * version 2. This program is licensed "as is" without any warranty of any - * kind, whether express or implied. - */ - -#include <linux/export.h> -#include <linux/init.h> -#include <linux/irq.h> -#include <linux/irqchip.h> -#include <linux/irqdomain.h> -#include <linux/io.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> - -#include <mach/common.h> -#include "cp_intc.h" - -static inline unsigned int cp_intc_read(unsigned offset) -{ - return __raw_readl(davinci_intc_base + offset); -} - -static inline void cp_intc_write(unsigned long value, unsigned offset) -{ - __raw_writel(value, davinci_intc_base + offset); -} - -static void cp_intc_ack_irq(struct irq_data *d) -{ - cp_intc_write(d->hwirq, CP_INTC_SYS_STAT_IDX_CLR); -} - -/* Disable interrupt */ -static void cp_intc_mask_irq(struct irq_data *d) -{ - /* XXX don't know why we need to disable nIRQ here... */ - cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_CLR); - cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_CLR); - cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET); -} - -/* Enable interrupt */ -static void cp_intc_unmask_irq(struct irq_data *d) -{ - cp_intc_write(d->hwirq, CP_INTC_SYS_ENABLE_IDX_SET); -} - -static int cp_intc_set_irq_type(struct irq_data *d, unsigned int flow_type) -{ - unsigned reg = BIT_WORD(d->hwirq); - unsigned mask = BIT_MASK(d->hwirq); - unsigned polarity = cp_intc_read(CP_INTC_SYS_POLARITY(reg)); - unsigned type = cp_intc_read(CP_INTC_SYS_TYPE(reg)); - - switch (flow_type) { - case IRQ_TYPE_EDGE_RISING: - polarity |= mask; - type |= mask; - break; - case IRQ_TYPE_EDGE_FALLING: - polarity &= ~mask; - type |= mask; - break; - case IRQ_TYPE_LEVEL_HIGH: - polarity |= mask; - type &= ~mask; - break; - case IRQ_TYPE_LEVEL_LOW: - polarity &= ~mask; - type &= ~mask; - break; - default: - return -EINVAL; - } - - cp_intc_write(polarity, CP_INTC_SYS_POLARITY(reg)); - cp_intc_write(type, CP_INTC_SYS_TYPE(reg)); - - return 0; -} - -static struct irq_chip cp_intc_irq_chip = { - .name = "cp_intc", - .irq_ack = cp_intc_ack_irq, - .irq_mask = cp_intc_mask_irq, - .irq_unmask = cp_intc_unmask_irq, - .irq_set_type = cp_intc_set_irq_type, - .flags = IRQCHIP_SKIP_SET_WAKE, -}; - -static struct irq_domain *cp_intc_domain; - -static int cp_intc_host_map(struct irq_domain *h, unsigned int virq, - irq_hw_number_t hw) -{ - pr_debug("cp_intc_host_map(%d, 0x%lx)\n", virq, hw); - - irq_set_chip(virq, &cp_intc_irq_chip); - irq_set_probe(virq); - irq_set_handler(virq, handle_edge_irq); - return 0; -} - -static const struct irq_domain_ops cp_intc_host_ops = { - .map = cp_intc_host_map, - .xlate = irq_domain_xlate_onetwocell, -}; - -int __init cp_intc_of_init(struct device_node *node, struct device_node *parent) -{ - u32 num_irq = davinci_soc_info.intc_irq_num; - u8 *irq_prio = davinci_soc_info.intc_irq_prios; - u32 *host_map = davinci_soc_info.intc_host_map; - unsigned num_reg = BITS_TO_LONGS(num_irq); - int i, irq_base; - - davinci_intc_type = DAVINCI_INTC_TYPE_CP_INTC; - if (node) { - davinci_intc_base = of_iomap(node, 0); - if (of_property_read_u32(node, "ti,intc-size", &num_irq)) - pr_warn("unable to get intc-size, default to %d\n", - num_irq); - } else { - davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_8K); - } - if (WARN_ON(!davinci_intc_base)) - return -EINVAL; - - cp_intc_write(0, CP_INTC_GLOBAL_ENABLE); - - /* Disable all host interrupts */ - cp_intc_write(0, CP_INTC_HOST_ENABLE(0)); - - /* Disable system interrupts */ - for (i = 0; i < num_reg; i++) - cp_intc_write(~0, CP_INTC_SYS_ENABLE_CLR(i)); - - /* Set to normal mode, no nesting, no priority hold */ - cp_intc_write(0, CP_INTC_CTRL); - cp_intc_write(0, CP_INTC_HOST_CTRL); - - /* Clear system interrupt status */ - for (i = 0; i < num_reg; i++) - cp_intc_write(~0, CP_INTC_SYS_STAT_CLR(i)); - - /* Enable nIRQ (what about nFIQ?) */ - cp_intc_write(1, CP_INTC_HOST_ENABLE_IDX_SET); - - /* - * Priority is determined by host channel: lower channel number has - * higher priority i.e. channel 0 has highest priority and channel 31 - * had the lowest priority. - */ - num_reg = (num_irq + 3) >> 2; /* 4 channels per register */ - if (irq_prio) { - unsigned j, k; - u32 val; - - for (k = i = 0; i < num_reg; i++) { - for (val = j = 0; j < 4; j++, k++) { - val >>= 8; - if (k < num_irq) - val |= irq_prio[k] << 24; - } - - cp_intc_write(val, CP_INTC_CHAN_MAP(i)); - } - } else { - /* - * Default everything to channel 15 if priority not specified. - * Note that channel 0-1 are mapped to nFIQ and channels 2-31 - * are mapped to nIRQ. - */ - for (i = 0; i < num_reg; i++) - cp_intc_write(0x0f0f0f0f, CP_INTC_CHAN_MAP(i)); - } - - if (host_map) - for (i = 0; host_map[i] != -1; i++) - cp_intc_write(host_map[i], CP_INTC_HOST_MAP(i)); - - irq_base = irq_alloc_descs(-1, 0, num_irq, 0); - if (irq_base < 0) { - pr_warn("Couldn't allocate IRQ numbers\n"); - irq_base = 0; - } - - /* create a legacy host */ - cp_intc_domain = irq_domain_add_legacy(node, num_irq, - irq_base, 0, &cp_intc_host_ops, NULL); - - if (!cp_intc_domain) { - pr_err("cp_intc: failed to allocate irq host!\n"); - return -EINVAL; - } - - /* Enable global interrupt */ - cp_intc_write(1, CP_INTC_GLOBAL_ENABLE); - - return 0; -} - -void __init cp_intc_init(void) -{ - cp_intc_of_init(NULL, NULL); -} - -IRQCHIP_DECLARE(cp_intc, "ti,cp-intc", cp_intc_of_init); 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