powerpc/8xx: Move mpc8xx_pic.c from sysdev to platform/8xx

mpc8xx_pic.c is dedicated to the 8xx, so move it to platform/8xx

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

4 files changed, 184 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/8xx/Makefile b/arch/powerpc/platforms/8xx/Makefile
index 756be8345868..f9af3218bd9c 100644
--- a/arch/powerpc/platforms/8xx/Makefile
+++ b/arch/powerpc/platforms/8xx/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for the PowerPC 8xx linux kernel.
 #
-obj-y			+= m8xx_setup.o machine_check.o
+obj-y			+= m8xx_setup.o machine_check.o pic.o
 obj-$(CONFIG_MPC885ADS)   += mpc885ads_setup.o
 obj-$(CONFIG_MPC86XADS)   += mpc86xads_setup.o
 obj-$(CONFIG_PPC_EP88XC)  += ep88xc.o
diff --git a/arch/powerpc/platforms/8xx/m8xx_setup.c b/arch/powerpc/platforms/8xx/m8xx_setup.c
index f81069f79a94..1917d69f84df 100644
--- a/arch/powerpc/platforms/8xx/m8xx_setup.c
+++ b/arch/powerpc/platforms/8xx/m8xx_setup.c
@@ -23,7 +23,7 @@
 #include <asm/fs_pd.h>
 #include <mm/mmu_decl.h>
 
-#include <sysdev/mpc8xx_pic.h>
+#include "pic.h"
 
 #include "mpc8xx.h"
 
diff --git a/arch/powerpc/platforms/8xx/pic.c b/arch/powerpc/platforms/8xx/pic.c
new file mode 100644
index 000000000000..8d5a25d43ef3
--- /dev/null
+++ b/arch/powerpc/platforms/8xx/pic.c
@@ -0,0 +1,163 @@
+#include <linux/kernel.h>
+#include <linux/stddef.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 "pic.h"
+
+
+#define PIC_VEC_SPURRIOUS      15
+
+extern int cpm_get_irq(struct pt_regs *regs);
+
+static struct irq_domain *mpc8xx_pic_host;
+static unsigned long mpc8xx_cached_irq_mask;
+static sysconf8xx_t __iomem *siu_reg;
+
+static inline unsigned long mpc8xx_irqd_to_bit(struct irq_data *d)
+{
+	return 0x80000000 >> irqd_to_hwirq(d);
+}
+
+static void mpc8xx_unmask_irq(struct irq_data *d)
+{
+	mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
+	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
+}
+
+static void mpc8xx_mask_irq(struct irq_data *d)
+{
+	mpc8xx_cached_irq_mask &= ~mpc8xx_irqd_to_bit(d);
+	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
+}
+
+static void mpc8xx_ack(struct irq_data *d)
+{
+	out_be32(&siu_reg->sc_sipend, mpc8xx_irqd_to_bit(d));
+}
+
+static void mpc8xx_end_irq(struct irq_data *d)
+{
+	mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
+	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
+}
+
+static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type)
+{
+	/* only external IRQ senses are programmable */
+	if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !(irqd_to_hwirq(d) & 1)) {
+		unsigned int siel = in_be32(&siu_reg->sc_siel);
+		siel |= mpc8xx_irqd_to_bit(d);
+		out_be32(&siu_reg->sc_siel, siel);
+		irq_set_handler_locked(d, handle_edge_irq);
+	}
+	return 0;
+}
+
+static struct irq_chip mpc8xx_pic = {
+	.name = "8XX SIU",
+	.irq_unmask = mpc8xx_unmask_irq,
+	.irq_mask = mpc8xx_mask_irq,
+	.irq_ack = mpc8xx_ack,
+	.irq_eoi = mpc8xx_end_irq,
+	.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)
+		return 0;
+
+        return irq_linear_revmap(mpc8xx_pic_host, irq);
+
+}
+
+static int mpc8xx_pic_host_map(struct irq_domain *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 */
+	irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
+	return 0;
+}
+
+
+static int mpc8xx_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
+			    const 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,
+	};
+
+	if (intspec[0] > 0x1f)
+		return 0;
+
+	*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 const struct irq_domain_ops mpc8xx_pic_host_ops = {
+	.map = mpc8xx_pic_host_map,
+	.xlate = mpc8xx_pic_host_xlate,
+};
+
+int mpc8xx_pic_init(void)
+{
+	struct resource res;
+	struct device_node *np;
+	int ret;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
+	if (np == NULL)
+		np = of_find_node_by_type(NULL, "mpc8xx-pic");
+	if (np == NULL) {
+		printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
+		return -ENOMEM;
+	}
+
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		goto out;
+
+	siu_reg = ioremap(res.start, resource_size(&res));
+	if (siu_reg == NULL) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	mpc8xx_pic_host = irq_domain_add_linear(np, 64, &mpc8xx_pic_host_ops, NULL);
+	if (mpc8xx_pic_host == NULL) {
+		printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+	return 0;
+
+out:
+	of_node_put(np);
+	return ret;
+}
diff --git a/arch/powerpc/platforms/8xx/pic.h b/arch/powerpc/platforms/8xx/pic.h
new file mode 100644
index 000000000000..9fe00eebdc8b
--- /dev/null
+++ b/arch/powerpc/platforms/8xx/pic.h
@@ -0,0 +1,19 @@
+#ifndef _PPC_KERNEL_MPC8xx_H
+#define _PPC_KERNEL_MPC8xx_H
+
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+int mpc8xx_pic_init(void);
+unsigned int mpc8xx_get_irq(void);
+
+/*
+ * Some internal interrupt registers use an 8-bit mask for the interrupt
+ * level instead of a number.
+ */
+static inline uint mk_int_int_mask(uint mask)
+{
+	return (1 << (7 - (mask/2)));
+}
+
+#endif /* _PPC_KERNEL_PPC8xx_H */