linux/drivers/macintosh/macio-adb.c
Benjamin Herrenschmidt 0ebfff1491 [POWERPC] Add new interrupt mapping core and change platforms to use it
This adds the new irq remapper core and removes the old one.  Because
there are some fundamental conflicts with the old code, like the value
of NO_IRQ which I'm now setting to 0 (as per discussions with Linus),
etc..., this commit also changes the relevant platform and driver code
over to use the new remapper (so as not to cause difficulties later
in bisecting).

This patch removes the old pre-parsing of the open firmware interrupt
tree along with all the bogus assumptions it made to try to renumber
interrupts according to the platform. This is all to be handled by the
new code now.

For the pSeries XICS interrupt controller, a single remapper host is
created for the whole machine regardless of how many interrupt
presentation and source controllers are found, and it's set to match
any device node that isn't a 8259.  That works fine on pSeries and
avoids having to deal with some of the complexities of split source
controllers vs. presentation controllers in the pSeries device trees.

The powerpc i8259 PIC driver now always requests the legacy interrupt
range. It also has the feature of being able to match any device node
(including NULL) if passed no device node as an input. That will help
porting over platforms with broken device-trees like Pegasos who don't
have a proper interrupt tree.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-07-03 21:36:01 +10:00

277 lines
6.4 KiB
C

/*
* Driver for the ADB controller in the Mac I/O (Hydra) chip.
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <asm/prom.h>
#include <linux/adb.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/hydra.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <linux/init.h>
#include <linux/ioport.h>
struct preg {
unsigned char r;
char pad[15];
};
struct adb_regs {
struct preg intr;
struct preg data[9];
struct preg intr_enb;
struct preg dcount;
struct preg error;
struct preg ctrl;
struct preg autopoll;
struct preg active_hi;
struct preg active_lo;
struct preg test;
};
/* Bits in intr and intr_enb registers */
#define DFB 1 /* data from bus */
#define TAG 2 /* transfer access grant */
/* Bits in dcount register */
#define HMB 0x0f /* how many bytes */
#define APD 0x10 /* auto-poll data */
/* Bits in error register */
#define NRE 1 /* no response error */
#define DLE 2 /* data lost error */
/* Bits in ctrl register */
#define TAR 1 /* transfer access request */
#define DTB 2 /* data to bus */
#define CRE 4 /* command response expected */
#define ADB_RST 8 /* ADB reset */
/* Bits in autopoll register */
#define APE 1 /* autopoll enable */
static volatile struct adb_regs __iomem *adb;
static struct adb_request *current_req, *last_req;
static DEFINE_SPINLOCK(macio_lock);
static int macio_probe(void);
static int macio_init(void);
static irqreturn_t macio_adb_interrupt(int irq, void *arg, struct pt_regs *regs);
static int macio_send_request(struct adb_request *req, int sync);
static int macio_adb_autopoll(int devs);
static void macio_adb_poll(void);
static int macio_adb_reset_bus(void);
struct adb_driver macio_adb_driver = {
"MACIO",
macio_probe,
macio_init,
macio_send_request,
/*macio_write,*/
macio_adb_autopoll,
macio_adb_poll,
macio_adb_reset_bus
};
int macio_probe(void)
{
return find_compatible_devices("adb", "chrp,adb0")? 0: -ENODEV;
}
int macio_init(void)
{
struct device_node *adbs;
struct resource r;
unsigned int irq;
adbs = find_compatible_devices("adb", "chrp,adb0");
if (adbs == 0)
return -ENXIO;
if (of_address_to_resource(adbs, 0, &r))
return -ENXIO;
adb = ioremap(r.start, sizeof(struct adb_regs));
out_8(&adb->ctrl.r, 0);
out_8(&adb->intr.r, 0);
out_8(&adb->error.r, 0);
out_8(&adb->active_hi.r, 0xff); /* for now, set all devices active */
out_8(&adb->active_lo.r, 0xff);
out_8(&adb->autopoll.r, APE);
irq = irq_of_parse_and_map(adbs, 0);
if (request_irq(irq, macio_adb_interrupt, 0, "ADB", (void *)0)) {
printk(KERN_ERR "ADB: can't get irq %d\n", irq);
return -EAGAIN;
}
out_8(&adb->intr_enb.r, DFB | TAG);
printk("adb: mac-io driver 1.0 for unified ADB\n");
return 0;
}
static int macio_adb_autopoll(int devs)
{
unsigned long flags;
spin_lock_irqsave(&macio_lock, flags);
out_8(&adb->active_hi.r, devs >> 8);
out_8(&adb->active_lo.r, devs);
out_8(&adb->autopoll.r, devs? APE: 0);
spin_unlock_irqrestore(&macio_lock, flags);
return 0;
}
static int macio_adb_reset_bus(void)
{
unsigned long flags;
int timeout = 1000000;
/* Hrm... we may want to not lock interrupts for so
* long ... oh well, who uses that chip anyway ? :)
* That function will be seldomly used during boot
* on rare machines, so...
*/
spin_lock_irqsave(&macio_lock, flags);
out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | ADB_RST);
while ((in_8(&adb->ctrl.r) & ADB_RST) != 0) {
if (--timeout == 0) {
out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) & ~ADB_RST);
return -1;
}
}
spin_unlock_irqrestore(&macio_lock, flags);
return 0;
}
/* Send an ADB command */
static int macio_send_request(struct adb_request *req, int sync)
{
unsigned long flags;
int i;
if (req->data[0] != ADB_PACKET)
return -EINVAL;
for (i = 0; i < req->nbytes - 1; ++i)
req->data[i] = req->data[i+1];
--req->nbytes;
req->next = NULL;
req->sent = 0;
req->complete = 0;
req->reply_len = 0;
spin_lock_irqsave(&macio_lock, flags);
if (current_req != 0) {
last_req->next = req;
last_req = req;
} else {
current_req = last_req = req;
out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);
}
spin_unlock_irqrestore(&macio_lock, flags);
if (sync) {
while (!req->complete)
macio_adb_poll();
}
return 0;
}
static irqreturn_t macio_adb_interrupt(int irq, void *arg,
struct pt_regs *regs)
{
int i, n, err;
struct adb_request *req = NULL;
unsigned char ibuf[16];
int ibuf_len = 0;
int complete = 0;
int autopoll = 0;
int handled = 0;
spin_lock(&macio_lock);
if (in_8(&adb->intr.r) & TAG) {
handled = 1;
if ((req = current_req) != 0) {
/* put the current request in */
for (i = 0; i < req->nbytes; ++i)
out_8(&adb->data[i].r, req->data[i]);
out_8(&adb->dcount.r, req->nbytes & HMB);
req->sent = 1;
if (req->reply_expected) {
out_8(&adb->ctrl.r, DTB + CRE);
} else {
out_8(&adb->ctrl.r, DTB);
current_req = req->next;
complete = 1;
if (current_req)
out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);
}
}
out_8(&adb->intr.r, 0);
}
if (in_8(&adb->intr.r) & DFB) {
handled = 1;
err = in_8(&adb->error.r);
if (current_req && current_req->sent) {
/* this is the response to a command */
req = current_req;
if (err == 0) {
req->reply_len = in_8(&adb->dcount.r) & HMB;
for (i = 0; i < req->reply_len; ++i)
req->reply[i] = in_8(&adb->data[i].r);
}
current_req = req->next;
complete = 1;
if (current_req)
out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);
} else if (err == 0) {
/* autopoll data */
n = in_8(&adb->dcount.r) & HMB;
for (i = 0; i < n; ++i)
ibuf[i] = in_8(&adb->data[i].r);
ibuf_len = n;
autopoll = (in_8(&adb->dcount.r) & APD) != 0;
}
out_8(&adb->error.r, 0);
out_8(&adb->intr.r, 0);
}
spin_unlock(&macio_lock);
if (complete && req) {
void (*done)(struct adb_request *) = req->done;
mb();
req->complete = 1;
/* Here, we assume that if the request has a done member, the
* struct request will survive to setting req->complete to 1
*/
if (done)
(*done)(req);
}
if (ibuf_len)
adb_input(ibuf, ibuf_len, regs, autopoll);
return IRQ_RETVAL(handled);
}
static void macio_adb_poll(void)
{
unsigned long flags;
local_irq_save(flags);
if (in_8(&adb->intr.r) != 0)
macio_adb_interrupt(0, NULL, NULL);
local_irq_restore(flags);
}