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sh: INTC ioremap support

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Extend the INTC code with ioremap() support V2.

Support INTC controllers that are not accessible through
a 1:1 virt:phys window. Needed by SH-Mobile ARM INTCS.

The INTC code behaves as usual if the io window resource
is omitted. The slow phys->virt lookup only happens during
setup. The fast path code operates on virtual addresses.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2010-03-19 16:48:01 +09:00 committed by Paul Mundt
parent 01e9651a21
commit dec710b77c
2 changed files with 78 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
drivers/sh/intc.c
View File

@ -43,6 +43,12 @@ struct intc_handle_int {
unsigned long handle;
};
struct intc_window {
phys_addr_t phys;
void __iomem *virt;
unsigned long size;
};
struct intc_desc_int {
struct list_head list;
struct sys_device sysdev;
@ -56,6 +62,8 @@ struct intc_desc_int {
unsigned int nr_prio;
struct intc_handle_int *sense;
unsigned int nr_sense;
struct intc_window *window;
unsigned int nr_windows;
struct irq_chip chip;
};
@ -420,11 +428,39 @@ static int intc_set_sense(unsigned int irq, unsigned int type)
return 0;
}
static unsigned long intc_phys_to_virt(struct intc_desc_int *d,
unsigned long address)
{
struct intc_window *window;
int k;
/* scan through physical windows and convert address */
for (k = 0; k < d->nr_windows; k++) {
window = d->window + k;
if (address < window->phys)
continue;
if (address >= (window->phys + window->size))
continue;
address -= window->phys;
address += (unsigned long)window->virt;
return address;
}
/* no windows defined, register must be 1:1 mapped virt:phys */
return address;
}
static unsigned int __init intc_get_reg(struct intc_desc_int *d,
unsigned long address)
unsigned long address)
{
unsigned int k;
address = intc_phys_to_virt(d, address);
for (k = 0; k < d->nr_reg; k++) {
if (d->reg[k] == address)
return k;
@ -774,6 +810,8 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
unsigned int smp)
{
if (value) {
value = intc_phys_to_virt(d, value);
d->reg[cnt] = value;
#ifdef CONFIG_SMP
d->smp[cnt] = smp;
@ -794,6 +832,7 @@ int __init register_intc_controller(struct intc_desc *desc)
unsigned int i, k, smp;
struct intc_hw_desc *hw = &desc->hw;
struct intc_desc_int *d;
struct resource *res;
d = kzalloc(sizeof(*d), GFP_NOWAIT);
if (!d)
@ -802,6 +841,25 @@ int __init register_intc_controller(struct intc_desc *desc)
INIT_LIST_HEAD(&d->list);
list_add(&d->list, &intc_list);
if (desc->num_resources) {
d->nr_windows = desc->num_resources;
d->window = kzalloc(d->nr_windows * sizeof(*d->window),
GFP_NOWAIT);
if (!d->window)
goto err1;
for (k = 0; k < d->nr_windows; k++) {
res = desc->resource + k;
WARN_ON(resource_type(res) != IORESOURCE_MEM);
d->window[k].phys = res->start;
d->window[k].size = resource_size(res);
d->window[k].virt = ioremap_nocache(res->start,
resource_size(res));
if (!d->window[k].virt)
goto err2;
}
}
d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
@ -809,12 +867,12 @@ int __init register_intc_controller(struct intc_desc *desc)
d->reg = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT);
if (!d->reg)
goto err1;
goto err2;
#ifdef CONFIG_SMP
d->smp = kzalloc(d->nr_reg * sizeof(*d->smp), GFP_NOWAIT);
if (!d->smp)
goto err2;
goto err3;
#endif
k = 0;
@ -830,7 +888,7 @@ int __init register_intc_controller(struct intc_desc *desc)
d->prio = kzalloc(hw->nr_vectors * sizeof(*d->prio),
GFP_NOWAIT);
if (!d->prio)
goto err3;
goto err4;
for (i = 0; i < hw->nr_prio_regs; i++) {
smp = IS_SMP(hw->prio_regs[i]);
@ -843,7 +901,7 @@ int __init register_intc_controller(struct intc_desc *desc)
d->sense = kzalloc(hw->nr_vectors * sizeof(*d->sense),
GFP_NOWAIT);
if (!d->sense)
goto err4;
goto err5;
for (i = 0; i < hw->nr_sense_regs; i++)
k += save_reg(d, k, hw->sense_regs[i].reg, 0);
@ -925,17 +983,23 @@ int __init register_intc_controller(struct intc_desc *desc)
intc_enable_disable_enum(desc, d, desc->force_enable, 1);
return 0;
err4:
err5:
kfree(d->prio);
err3:
err4:
#ifdef CONFIG_SMP
kfree(d->smp);
err2:
err3:
#endif
kfree(d->reg);
err1:
err2:
for (k = 0; k < d->nr_windows; k++)
if (d->window[k].virt)
iounmap(d->window[k].virt);
kfree(d->window);
err1:
kfree(d);
err0:
err0:
pr_err("unable to allocate INTC memory\n");
return -ENOMEM;

4
include/linux/sh_intc.h
View File

@ -1,6 +1,8 @@
#ifndef __SH_INTC_H
#define __SH_INTC_H
#include <linux/ioport.h>
typedef unsigned char intc_enum;
struct intc_vect {
@ -71,6 +73,8 @@ struct intc_hw_desc {
struct intc_desc {
char *name;
struct resource *resource;
unsigned int num_resources;
intc_enum force_enable;
intc_enum force_disable;
struct intc_hw_desc hw;