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path: root/drivers/macintosh/via-cuda.c
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Diffstat (limited to 'drivers/macintosh/via-cuda.c')
-rw-r--r--drivers/macintosh/via-cuda.c131
1 files changed, 71 insertions, 60 deletions
diff --git a/drivers/macintosh/via-cuda.c b/drivers/macintosh/via-cuda.c
index df66291b132..d61f271d220 100644
--- a/drivers/macintosh/via-cuda.c
+++ b/drivers/macintosh/via-cuda.c
@@ -13,7 +13,6 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
-#include <linux/sched.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/spinlock.h>
@@ -24,11 +23,9 @@
#else
#include <asm/macintosh.h>
#include <asm/macints.h>
-#include <asm/machw.h>
#include <asm/mac_via.h>
#endif
#include <asm/io.h>
-#include <asm/system.h>
#include <linux/init.h>
static volatile unsigned char __iomem *via;
@@ -83,14 +80,14 @@ static unsigned char cuda_rbuf[16];
static unsigned char *reply_ptr;
static int reading_reply;
static int data_index;
+static int cuda_irq;
#ifdef CONFIG_PPC
static struct device_node *vias;
#endif
-static int cuda_fully_inited = 0;
+static int cuda_fully_inited;
#ifdef CONFIG_ADB
static int cuda_probe(void);
-static int cuda_init(void);
static int cuda_send_request(struct adb_request *req, int sync);
static int cuda_adb_autopoll(int devs);
static int cuda_reset_adb_bus(void);
@@ -108,17 +105,42 @@ int cuda_request(struct adb_request *req,
#ifdef CONFIG_ADB
struct adb_driver via_cuda_driver = {
- "CUDA",
- cuda_probe,
- cuda_init,
- cuda_send_request,
- cuda_adb_autopoll,
- cuda_poll,
- cuda_reset_adb_bus
+ .name = "CUDA",
+ .probe = cuda_probe,
+ .send_request = cuda_send_request,
+ .autopoll = cuda_adb_autopoll,
+ .poll = cuda_poll,
+ .reset_bus = cuda_reset_adb_bus,
};
#endif /* CONFIG_ADB */
-#ifdef CONFIG_PPC
+#ifdef CONFIG_MAC
+int __init find_via_cuda(void)
+{
+ struct adb_request req;
+ int err;
+
+ if (macintosh_config->adb_type != MAC_ADB_CUDA)
+ return 0;
+
+ via = via1;
+ cuda_state = idle;
+
+ err = cuda_init_via();
+ if (err) {
+ printk(KERN_ERR "cuda_init_via() failed\n");
+ via = NULL;
+ return 0;
+ }
+
+ /* enable autopoll */
+ cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
+ while (!req.complete)
+ cuda_poll();
+
+ return 1;
+}
+#else
int __init find_via_cuda(void)
{
struct adb_request req;
@@ -132,7 +154,7 @@ int __init find_via_cuda(void)
if (vias == 0)
return 0;
- reg = get_property(vias, "reg", NULL);
+ reg = of_get_property(vias, "reg", NULL);
if (reg == NULL) {
printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
goto fail;
@@ -161,10 +183,8 @@ int __init find_via_cuda(void)
/* Clear and enable interrupts, but only on PPC. On 68K it's done */
/* for us by the main VIA driver in arch/m68k/mac/via.c */
-#ifndef CONFIG_MAC
out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */
out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
-#endif
/* enable autopoll */
cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
@@ -178,28 +198,26 @@ int __init find_via_cuda(void)
vias = NULL;
return 0;
}
-#endif /* CONFIG_PPC */
+#endif /* !defined CONFIG_MAC */
static int __init via_cuda_start(void)
{
- unsigned int irq;
-
if (via == NULL)
return -ENODEV;
#ifdef CONFIG_MAC
- irq = IRQ_MAC_ADB;
-#else /* CONFIG_MAC */
- irq = irq_of_parse_and_map(vias, 0);
- if (irq == NO_IRQ) {
+ cuda_irq = IRQ_MAC_ADB;
+#else
+ cuda_irq = irq_of_parse_and_map(vias, 0);
+ if (cuda_irq == NO_IRQ) {
printk(KERN_ERR "via-cuda: can't map interrupts for %s\n",
vias->full_name);
return -ENODEV;
}
-#endif /* CONFIG_MAP */
+#endif
- if (request_irq(irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
- printk(KERN_ERR "via-cuda: can't request irq %d\n", irq);
+ if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
+ printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);
return -EAGAIN;
}
@@ -221,27 +239,10 @@ cuda_probe(void)
#else
if (macintosh_config->adb_type != MAC_ADB_CUDA)
return -ENODEV;
- via = via1;
#endif
- return 0;
-}
-
-static int __init
-cuda_init(void)
-{
-#ifdef CONFIG_PPC
if (via == NULL)
return -ENODEV;
return 0;
-#else
- int err = cuda_init_via();
- if (err) {
- printk(KERN_ERR "cuda_init_via() failed\n");
- return -ENODEV;
- }
-
- return via_cuda_start();
-#endif
}
#endif /* CONFIG_ADB */
@@ -258,21 +259,23 @@ cuda_init(void)
} while (0)
static int
-cuda_init_via(void)
+__init cuda_init_via(void)
{
out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */
out_8(&via[B], in_8(&via[B]) | TACK | TIP); /* negate them */
out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */
(void)in_8(&via[SR]); /* clear any left-over data */
-#ifndef CONFIG_MAC
+#ifdef CONFIG_PPC
out_8(&via[IER], 0x7f); /* disable interrupts from VIA */
(void)in_8(&via[IER]);
+#else
+ out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */
#endif
/* delay 4ms and then clear any pending interrupt */
mdelay(4);
(void)in_8(&via[SR]);
- out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+ out_8(&via[IFR], SR_INT);
/* sync with the CUDA - assert TACK without TIP */
out_8(&via[B], in_8(&via[B]) & ~TACK);
@@ -283,7 +286,7 @@ cuda_init_via(void)
/* wait for the interrupt and then clear it */
WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
(void)in_8(&via[SR]);
- out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+ out_8(&via[IFR], SR_INT);
/* finish the sync by negating TACK */
out_8(&via[B], in_8(&via[B]) | TACK);
@@ -292,7 +295,7 @@ cuda_init_via(void)
WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)");
WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
(void)in_8(&via[SR]);
- out_8(&via[IFR], in_8(&via[IFR]) & 0x7f);
+ out_8(&via[IFR], SR_INT);
out_8(&via[B], in_8(&via[B]) | TIP); /* should be unnecessary */
return 0;
@@ -429,16 +432,14 @@ cuda_start(void)
void
cuda_poll(void)
{
- unsigned long flags;
-
/* cuda_interrupt only takes a normal lock, we disable
* interrupts here to avoid re-entering and thus deadlocking.
- * An option would be to disable only the IRQ source with
- * disable_irq(), would that work on m68k ? --BenH
*/
- local_irq_save(flags);
+ if (cuda_irq)
+ disable_irq(cuda_irq);
cuda_interrupt(0, NULL);
- local_irq_restore(flags);
+ if (cuda_irq)
+ enable_irq(cuda_irq);
}
static irqreturn_t
@@ -449,15 +450,25 @@ cuda_interrupt(int irq, void *arg)
unsigned char ibuf[16];
int ibuf_len = 0;
int complete = 0;
- unsigned char virq;
spin_lock(&cuda_lock);
- virq = in_8(&via[IFR]) & 0x7f;
- out_8(&via[IFR], virq);
- if ((virq & SR_INT) == 0) {
- spin_unlock(&cuda_lock);
- return IRQ_NONE;
+ /* On powermacs, this handler is registered for the VIA IRQ. But they use
+ * just the shift register IRQ -- other VIA interrupt sources are disabled.
+ * On m68k macs, the VIA IRQ sources are dispatched individually. Unless
+ * we are polling, the shift register IRQ flag has already been cleared.
+ */
+
+#ifdef CONFIG_MAC
+ if (!arg)
+#endif
+ {
+ if ((in_8(&via[IFR]) & SR_INT) == 0) {
+ spin_unlock(&cuda_lock);
+ return IRQ_NONE;
+ } else {
+ out_8(&via[IFR], SR_INT);
+ }
}
status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 10:16:01 +0000