Contributors: 20
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
1207 |
79.20% |
37 |
62.71% |
| Paul Mackerras |
185 |
12.14% |
3 |
5.08% |
| David Woodhouse |
26 |
1.71% |
1 |
1.69% |
| Finn Thain |
22 |
1.44% |
1 |
1.69% |
| Stephen Rothwell |
17 |
1.12% |
1 |
1.69% |
| Benjamin Herrenschmidt |
15 |
0.98% |
1 |
1.69% |
| R SUNDAR |
12 |
0.79% |
1 |
1.69% |
| Xie Shaowen |
9 |
0.59% |
1 |
1.69% |
| Yang Yingliang |
5 |
0.33% |
1 |
1.69% |
| Haowen Bai |
5 |
0.33% |
1 |
1.69% |
| Thomas Gleixner |
4 |
0.26% |
1 |
1.69% |
| Mike Rapoport |
3 |
0.20% |
1 |
1.69% |
| Grant C. Likely |
3 |
0.20% |
1 |
1.69% |
| Al Viro |
3 |
0.20% |
2 |
3.39% |
| Colin Leroy |
2 |
0.13% |
1 |
1.69% |
| Li Yang |
2 |
0.13% |
1 |
1.69% |
| Rob Herring |
1 |
0.07% |
1 |
1.69% |
| Lucas De Marchi |
1 |
0.07% |
1 |
1.69% |
| Christophe Leroy |
1 |
0.07% |
1 |
1.69% |
| Greg Kroah-Hartman |
1 |
0.07% |
1 |
1.69% |
| Total |
1524 |
|
59 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for the ADB controller in the Mac I/O (Hydra) chip.
*/
#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 <linux/pgtable.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/adb.h>
#include <asm/io.h>
#include <asm/hydra.h>
#include <asm/irq.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 = {
.name = "MACIO",
.probe = macio_probe,
.init = macio_init,
.send_request = macio_send_request,
.autopoll = macio_adb_autopoll,
.poll = macio_adb_poll,
.reset_bus = macio_adb_reset_bus,
};
int macio_probe(void)
{
struct device_node *np __free(device_node) =
of_find_compatible_node(NULL, "adb", "chrp,adb0");
if (np)
return 0;
return -ENODEV;
}
int macio_init(void)
{
struct device_node *adbs __free(device_node) =
of_find_compatible_node(NULL, "adb", "chrp,adb0");
struct resource r;
unsigned int irq;
if (!adbs)
return -ENXIO;
if (of_address_to_resource(adbs, 0, &r))
return -ENXIO;
adb = ioremap(r.start, sizeof(struct adb_regs));
if (!adb)
return -ENOMEM;
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)) {
iounmap(adb);
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 seldom 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);
spin_unlock_irqrestore(&macio_lock, flags);
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) {
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;
req = current_req;
if (req) {
/* 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);
}