/*
* 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;
}
}