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Diffstat (limited to 'arch/powerpc/sysdev/mpc8xx_pic.c')
-rw-r--r--arch/powerpc/sysdev/mpc8xx_pic.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpc8xx_pic.c b/arch/powerpc/sysdev/mpc8xx_pic.c
new file mode 100644
index 000000000000..2fc2bcd79b5e
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc8xx_pic.c
@@ -0,0 +1,197 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/irq.h>
+#include <linux/dma-mapping.h>
+#include <asm/prom.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/8xx_immap.h>
+#include <asm/mpc8xx.h>
+
+#include "mpc8xx_pic.h"
+
+
+#define PIC_VEC_SPURRIOUS 15
+
+extern int cpm_get_irq(struct pt_regs *regs);
+
+static struct device_node *mpc8xx_pic_node;
+static struct irq_host *mpc8xx_pic_host;
+#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
+static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
+static sysconf8xx_t *siu_reg;
+
+int cpm_get_irq(struct pt_regs *regs);
+
+static void mpc8xx_unmask_irq(unsigned int virq)
+{
+ int bit, word;
+ unsigned int irq_nr = (unsigned int)irq_map[virq].hwirq;
+
+ bit = irq_nr & 0x1f;
+ word = irq_nr >> 5;
+
+ ppc_cached_irq_mask[word] |= (1 << (31-bit));
+ out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
+}
+
+static void mpc8xx_mask_irq(unsigned int virq)
+{
+ int bit, word;
+ unsigned int irq_nr = (unsigned int)irq_map[virq].hwirq;
+
+ bit = irq_nr & 0x1f;
+ word = irq_nr >> 5;
+
+ ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
+ out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
+}
+
+static void mpc8xx_ack(unsigned int virq)
+{
+ int bit;
+ unsigned int irq_nr = (unsigned int)irq_map[virq].hwirq;
+
+ bit = irq_nr & 0x1f;
+ out_be32(&siu_reg->sc_sipend, 1 << (31-bit));
+}
+
+static void mpc8xx_end_irq(unsigned int virq)
+{
+ int bit, word;
+ unsigned int irq_nr = (unsigned int)irq_map[virq].hwirq;
+
+ bit = irq_nr & 0x1f;
+ word = irq_nr >> 5;
+
+ ppc_cached_irq_mask[word] |= (1 << (31-bit));
+ out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
+}
+
+static int mpc8xx_set_irq_type(unsigned int virq, unsigned int flow_type)
+{
+ struct irq_desc *desc = get_irq_desc(virq);
+
+ desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
+ desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
+ if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
+ desc->status |= IRQ_LEVEL;
+
+ if (flow_type & IRQ_TYPE_EDGE_FALLING) {
+ irq_hw_number_t hw = (unsigned int)irq_map[virq].hwirq;
+ unsigned int siel = in_be32(&siu_reg->sc_siel);
+
+ /* only external IRQ senses are programmable */
+ if ((hw & 1) == 0) {
+ siel |= (0x80000000 >> hw);
+ out_be32(&siu_reg->sc_siel, siel);
+ desc->handle_irq = handle_edge_irq;
+ }
+ }
+ return 0;
+}
+
+static struct irq_chip mpc8xx_pic = {
+ .typename = " MPC8XX SIU ",
+ .unmask = mpc8xx_unmask_irq,
+ .mask = mpc8xx_mask_irq,
+ .ack = mpc8xx_ack,
+ .eoi = mpc8xx_end_irq,
+ .set_type = mpc8xx_set_irq_type,
+};
+
+unsigned int mpc8xx_get_irq(void)
+{
+ int irq;
+
+ /* For MPC8xx, read the SIVEC register and shift the bits down
+ * to get the irq number.
+ */
+ irq = in_be32(&siu_reg->sc_sivec) >> 26;
+
+ if (irq == PIC_VEC_SPURRIOUS)
+ irq = NO_IRQ;
+
+ return irq_linear_revmap(mpc8xx_pic_host, irq);
+
+}
+
+static int mpc8xx_pic_host_match(struct irq_host *h, struct device_node *node)
+{
+ return mpc8xx_pic_node == node;
+}
+
+static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
+
+ /* Set default irq handle */
+ set_irq_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
+ return 0;
+}
+
+
+static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
+ u32 *intspec, unsigned int intsize,
+ irq_hw_number_t *out_hwirq, unsigned int *out_flags)
+{
+ static unsigned char map_pic_senses[4] = {
+ IRQ_TYPE_EDGE_RISING,
+ IRQ_TYPE_LEVEL_LOW,
+ IRQ_TYPE_LEVEL_HIGH,
+ IRQ_TYPE_EDGE_FALLING,
+ };
+
+ *out_hwirq = intspec[0];
+ if (intsize > 1 && intspec[1] < 4)
+ *out_flags = map_pic_senses[intspec[1]];
+ else
+ *out_flags = IRQ_TYPE_NONE;
+
+ return 0;
+}
+
+
+static struct irq_host_ops mpc8xx_pic_host_ops = {
+ .match = mpc8xx_pic_host_match,
+ .map = mpc8xx_pic_host_map,
+ .xlate = mpc8xx_pic_host_xlate,
+};
+
+int mpc8xx_pic_init(void)
+{
+ struct resource res;
+ struct device_node *np = NULL;
+ int ret;
+
+ np = of_find_node_by_type(np, "mpc8xx-pic");
+
+ if (np == NULL) {
+ printk(KERN_ERR "Could not find open-pic node\n");
+ return -ENOMEM;
+ }
+
+ mpc8xx_pic_node = of_node_get(np);
+
+ ret = of_address_to_resource(np, 0, &res);
+ of_node_put(np);
+ if (ret)
+ return ret;
+
+ siu_reg = (void *)ioremap(res.start, res.end - res.start + 1);
+ if (siu_reg == NULL)
+ return -EINVAL;
+
+ mpc8xx_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 64, &mpc8xx_pic_host_ops, 64);
+ if (mpc8xx_pic_host == NULL) {
+ printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
+ ret = -ENOMEM;
+ }
+
+ return ret;
+}