kernel-ark/drivers/macintosh/macio-adb.c
Tim Schmielau cd354f1ae7 [PATCH] remove many unneeded #includes of sched.h
After Al Viro (finally) succeeded in removing the sched.h #include in module.h
recently, it makes sense again to remove other superfluous sched.h includes.
There are quite a lot of files which include it but don't actually need
anything defined in there.  Presumably these includes were once needed for
macros that used to live in sched.h, but moved to other header files in the
course of cleaning it up.

To ease the pain, this time I did not fiddle with any header files and only
removed #includes from .c-files, which tend to cause less trouble.

Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
configs in arch/arm/configs on arm.  I also checked that no new warnings were
introduced by the patch (actually, some warnings are removed that were emitted
by unnecessarily included header files).

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-14 08:09:54 -08:00

275 lines
6.3 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/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);
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)
{
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, 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);
local_irq_restore(flags);
}