mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
449012daa9
Mostly sparse fixes (__iomem annotations, etc); also, cpm2_immr is used rather than creating many temporary mappings. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
276 lines
6.9 KiB
C
276 lines
6.9 KiB
C
/*
|
|
* 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/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/irq.h>
|
|
|
|
#include <asm/immap_cpm2.h>
|
|
#include <asm/mpc8260.h>
|
|
#include <asm/io.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/fs_pd.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_host *cpm2_pic_host;
|
|
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
|
|
static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
|
|
|
|
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(unsigned int virq)
|
|
{
|
|
int bit, word;
|
|
unsigned int irq_nr = virq_to_hw(virq);
|
|
|
|
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(unsigned int virq)
|
|
{
|
|
int bit, word;
|
|
unsigned int irq_nr = virq_to_hw(virq);
|
|
|
|
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(unsigned int virq)
|
|
{
|
|
int bit, word;
|
|
unsigned int irq_nr = virq_to_hw(virq);
|
|
|
|
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(unsigned int virq)
|
|
{
|
|
int bit, word;
|
|
unsigned int irq_nr = virq_to_hw(virq);
|
|
|
|
if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
|
|
&& irq_desc[irq_nr].action) {
|
|
|
|
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(unsigned int virq, unsigned int flow_type)
|
|
{
|
|
unsigned int src = virq_to_hw(virq);
|
|
struct irq_desc *desc = get_irq_desc(virq);
|
|
unsigned int vold, vnew, edibit;
|
|
|
|
if (flow_type == IRQ_TYPE_NONE)
|
|
flow_type = IRQ_TYPE_LEVEL_LOW;
|
|
|
|
if (flow_type & IRQ_TYPE_EDGE_RISING) {
|
|
printk(KERN_ERR "CPM2 PIC: sense type 0x%x not supported\n",
|
|
flow_type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
|
|
desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
|
|
if (flow_type & IRQ_TYPE_LEVEL_LOW) {
|
|
desc->status |= IRQ_LEVEL;
|
|
desc->handle_irq = handle_level_irq;
|
|
} else
|
|
desc->handle_irq = 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 - (src - CPM2_IRQ_PORTC15));
|
|
else
|
|
return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -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 0;
|
|
}
|
|
|
|
static struct irq_chip cpm2_pic = {
|
|
.typename = " CPM2 SIU ",
|
|
.mask = cpm2_mask_irq,
|
|
.unmask = cpm2_unmask_irq,
|
|
.ack = cpm2_ack,
|
|
.eoi = cpm2_end_irq,
|
|
.set_type = cpm2_set_irq_type,
|
|
};
|
|
|
|
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_host *h, unsigned int virq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
|
|
|
|
get_irq_desc(virq)->status |= IRQ_LEVEL;
|
|
set_irq_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
|
|
return 0;
|
|
}
|
|
|
|
static int cpm2_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)
|
|
{
|
|
*out_hwirq = intspec[0];
|
|
if (intsize > 1)
|
|
*out_flags = intspec[1];
|
|
else
|
|
*out_flags = IRQ_TYPE_NONE;
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_host_ops cpm2_pic_host_ops = {
|
|
.map = cpm2_pic_host_map,
|
|
.xlate = cpm2_pic_host_xlate,
|
|
};
|
|
|
|
void cpm2_pic_init(struct device_node *node)
|
|
{
|
|
int i;
|
|
|
|
cpm2_intctl = cpm2_map(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_alloc_host(of_node_get(node), IRQ_HOST_MAP_LINEAR,
|
|
64, &cpm2_pic_host_ops, 64);
|
|
if (cpm2_pic_host == NULL) {
|
|
printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
|
|
return;
|
|
}
|
|
}
|