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-rw-r--r--arch/powerpc/sysdev/cpm2_pic.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm2_pic.c b/arch/powerpc/sysdev/cpm2_pic.c
new file mode 100644
index 000000000..e14493685
--- /dev/null
+++ b/arch/powerpc/sysdev/cpm2_pic.c
@@ -0,0 +1,267 @@
+/*
+ * Platform information definitions.
+ *
+ * Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates
+ * to make in work in arch/powerpc/. Original (c) belongs to Dan Malek.
+ *
+ * Author: Vitaly Bordug <vbordug@ru.mvista.com>
+ *
+ * 1999-2001 (c) Dan Malek <dan@embeddedalley.com>
+ * 2006 (c) MontaVista Software, Inc.
+ *
+ * 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.
+ */
+
+/* The CPM2 internal interrupt controller. It is usually
+ * the only interrupt controller.
+ * There are two 32-bit registers (high/low) for up to 64
+ * possible interrupts.
+ *
+ * Now, the fun starts.....Interrupt Numbers DO NOT MAP
+ * in a simple arithmetic fashion to mask or pending registers.
+ * That is, interrupt 4 does not map to bit position 4.
+ * We create two tables, indexed by vector number, to indicate
+ * which register to use and which bit in the register to use.
+ */
+
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+
+#include <asm/immap_cpm2.h>
+#include <asm/io.h>
+
+#include "cpm2_pic.h"
+
+/* External IRQS */
+#define CPM2_IRQ_EXT1 19
+#define CPM2_IRQ_EXT7 25
+
+/* Port C IRQS */
+#define CPM2_IRQ_PORTC15 48
+#define CPM2_IRQ_PORTC0 63
+
+static intctl_cpm2_t __iomem *cpm2_intctl;
+
+static struct irq_domain *cpm2_pic_host;
+static unsigned long ppc_cached_irq_mask[2]; /* 2 32-bit registers */
+
+static const u_char irq_to_siureg[] = {
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* bit numbers do not match the docs, these are precomputed so the bit for
+ * a given irq is (1 << irq_to_siubit[irq]) */
+static const u_char irq_to_siubit[] = {
+ 0, 15, 14, 13, 12, 11, 10, 9,
+ 8, 7, 6, 5, 4, 3, 2, 1,
+ 2, 1, 0, 14, 13, 12, 11, 10,
+ 9, 8, 7, 6, 5, 4, 3, 0,
+ 31, 30, 29, 28, 27, 26, 25, 24,
+ 23, 22, 21, 20, 19, 18, 17, 16,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+};
+
+static void cpm2_mask_irq(struct irq_data *d)
+{
+ int bit, word;
+ unsigned int irq_nr = irqd_to_hwirq(d);
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ ppc_cached_irq_mask[word] &= ~(1 << bit);
+ out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
+}
+
+static void cpm2_unmask_irq(struct irq_data *d)
+{
+ int bit, word;
+ unsigned int irq_nr = irqd_to_hwirq(d);
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ ppc_cached_irq_mask[word] |= 1 << bit;
+ out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
+}
+
+static void cpm2_ack(struct irq_data *d)
+{
+ int bit, word;
+ unsigned int irq_nr = irqd_to_hwirq(d);
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ out_be32(&cpm2_intctl->ic_sipnrh + word, 1 << bit);
+}
+
+static void cpm2_end_irq(struct irq_data *d)
+{
+ int bit, word;
+ unsigned int irq_nr = irqd_to_hwirq(d);
+
+ bit = irq_to_siubit[irq_nr];
+ word = irq_to_siureg[irq_nr];
+
+ ppc_cached_irq_mask[word] |= 1 << bit;
+ out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
+
+ /*
+ * Work around large numbers of spurious IRQs on PowerPC 82xx
+ * systems.
+ */
+ mb();
+}
+
+static int cpm2_set_irq_type(struct irq_data *d, unsigned int flow_type)
+{
+ unsigned int src = irqd_to_hwirq(d);
+ unsigned int vold, vnew, edibit;
+
+ /* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or
+ * IRQ_TYPE_EDGE_BOTH (default). All others are IRQ_TYPE_EDGE_FALLING
+ * or IRQ_TYPE_LEVEL_LOW (default)
+ */
+ if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) {
+ if (flow_type == IRQ_TYPE_NONE)
+ flow_type = IRQ_TYPE_EDGE_BOTH;
+
+ if (flow_type != IRQ_TYPE_EDGE_BOTH &&
+ flow_type != IRQ_TYPE_EDGE_FALLING)
+ goto err_sense;
+ } else {
+ if (flow_type == IRQ_TYPE_NONE)
+ flow_type = IRQ_TYPE_LEVEL_LOW;
+
+ if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
+ goto err_sense;
+ }
+
+ irqd_set_trigger_type(d, flow_type);
+ if (flow_type & IRQ_TYPE_LEVEL_LOW)
+ irq_set_handler_locked(d, handle_level_irq);
+ else
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ /* internal IRQ senses are LEVEL_LOW
+ * EXT IRQ and Port C IRQ senses are programmable
+ */
+ if (src >= CPM2_IRQ_EXT1 && src <= CPM2_IRQ_EXT7)
+ edibit = (14 - (src - CPM2_IRQ_EXT1));
+ else
+ if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0)
+ edibit = (31 - (CPM2_IRQ_PORTC0 - src));
+ else
+ return (flow_type & IRQ_TYPE_LEVEL_LOW) ?
+ IRQ_SET_MASK_OK_NOCOPY : -EINVAL;
+
+ vold = in_be32(&cpm2_intctl->ic_siexr);
+
+ if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING)
+ vnew = vold | (1 << edibit);
+ else
+ vnew = vold & ~(1 << edibit);
+
+ if (vold != vnew)
+ out_be32(&cpm2_intctl->ic_siexr, vnew);
+ return IRQ_SET_MASK_OK_NOCOPY;
+
+err_sense:
+ pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type);
+ return -EINVAL;
+}
+
+static struct irq_chip cpm2_pic = {
+ .name = "CPM2 SIU",
+ .irq_mask = cpm2_mask_irq,
+ .irq_unmask = cpm2_unmask_irq,
+ .irq_ack = cpm2_ack,
+ .irq_eoi = cpm2_end_irq,
+ .irq_set_type = cpm2_set_irq_type,
+ .flags = IRQCHIP_EOI_IF_HANDLED,
+};
+
+unsigned int cpm2_get_irq(void)
+{
+ int irq;
+ unsigned long bits;
+
+ /* For CPM2, read the SIVEC register and shift the bits down
+ * to get the irq number. */
+ bits = in_be32(&cpm2_intctl->ic_sivec);
+ irq = bits >> 26;
+
+ if (irq == 0)
+ return(-1);
+ return irq_linear_revmap(cpm2_pic_host, irq);
+}
+
+static int cpm2_pic_host_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
+
+ irq_set_status_flags(virq, IRQ_LEVEL);
+ irq_set_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
+ return 0;
+}
+
+static const struct irq_domain_ops cpm2_pic_host_ops = {
+ .map = cpm2_pic_host_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+void cpm2_pic_init(struct device_node *node)
+{
+ int i;
+
+ cpm2_intctl = &cpm2_immr->im_intctl;
+
+ /* Clear the CPM IRQ controller, in case it has any bits set
+ * from the bootloader
+ */
+
+ /* Mask out everything */
+
+ out_be32(&cpm2_intctl->ic_simrh, 0x00000000);
+ out_be32(&cpm2_intctl->ic_simrl, 0x00000000);
+
+ wmb();
+
+ /* Ack everything */
+ out_be32(&cpm2_intctl->ic_sipnrh, 0xffffffff);
+ out_be32(&cpm2_intctl->ic_sipnrl, 0xffffffff);
+ wmb();
+
+ /* Dummy read of the vector */
+ i = in_be32(&cpm2_intctl->ic_sivec);
+ rmb();
+
+ /* Initialize the default interrupt mapping priorities,
+ * in case the boot rom changed something on us.
+ */
+ out_be16(&cpm2_intctl->ic_sicr, 0);
+ out_be32(&cpm2_intctl->ic_scprrh, 0x05309770);
+ out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
+
+ /* create a legacy host */
+ cpm2_pic_host = irq_domain_add_linear(node, 64, &cpm2_pic_host_ops, NULL);
+ if (cpm2_pic_host == NULL) {
+ printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
+ return;
+ }
+}
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