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-rw-r--r--arch/cris/arch-v10/kernel/io_interface_mux.c515
1 files changed, 408 insertions, 107 deletions
diff --git a/arch/cris/arch-v10/kernel/io_interface_mux.c b/arch/cris/arch-v10/kernel/io_interface_mux.c
index f3b327d4ed9..add98e0941b 100644
--- a/arch/cris/arch-v10/kernel/io_interface_mux.c
+++ b/arch/cris/arch-v10/kernel/io_interface_mux.c
@@ -1,10 +1,9 @@
/* IO interface mux allocator for ETRAX100LX.
- * Copyright 2004, Axis Communications AB
- * $Id: io_interface_mux.c,v 1.2 2004/12/21 12:08:38 starvik Exp $
+ * Copyright 2004-2007, Axis Communications AB
*/
-/* C.f. ETRAX100LX Designer's Reference 20.9 */
+/* C.f. ETRAX100LX Designer's Reference chapter 19.9 */
#include <linux/kernel.h>
#include <linux/slab.h>
@@ -45,17 +44,39 @@ struct watcher
struct if_group
{
enum io_if_group group;
- unsigned char used;
- enum cris_io_interface owner;
+ /* name - the name of the group 'A' to 'F' */
+ char *name;
+ /* used - a bit mask of all pins in the group in the order listed
+ * in the tables in 19.9.1 to 19.9.6. Note that no
+ * distinction is made between in, out and in/out pins. */
+ unsigned int used;
};
struct interface
{
enum cris_io_interface ioif;
+ /* name - the name of the interface */
+ char *name;
+ /* groups - OR'ed together io_if_group flags describing what pin groups
+ * the interface uses pins in. */
unsigned char groups;
+ /* used - set when the interface is allocated. */
unsigned char used;
char *owner;
+ /* group_a through group_f - bit masks describing what pins in the
+ * pin groups the interface uses. */
+ unsigned int group_a;
+ unsigned int group_b;
+ unsigned int group_c;
+ unsigned int group_d;
+ unsigned int group_e;
+ unsigned int group_f;
+
+ /* gpio_g_in, gpio_g_out, gpio_b - bit masks telling what pins in the
+ * GPIO ports the interface uses. This could be reconstucted using
+ * the group_X masks and a table of what pins the GPIO ports use,
+ * but that would be messy. */
unsigned int gpio_g_in;
unsigned int gpio_g_out;
unsigned char gpio_b;
@@ -64,26 +85,32 @@ struct interface
static struct if_group if_groups[6] = {
{
.group = group_a,
+ .name = "A",
.used = 0,
},
{
.group = group_b,
+ .name = "B",
.used = 0,
},
{
.group = group_c,
+ .name = "C",
.used = 0,
},
{
.group = group_d,
+ .name = "D",
.used = 0,
},
{
.group = group_e,
+ .name = "E",
.used = 0,
},
{
.group = group_f,
+ .name = "F",
.used = 0,
}
};
@@ -94,14 +121,32 @@ static struct interface interfaces[] = {
/* Begin Non-multiplexed interfaces */
{
.ioif = if_eth,
+ .name = "ethernet",
.groups = 0,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0,
.gpio_g_out = 0,
.gpio_b = 0
},
{
.ioif = if_serial_0,
+ .name = "serial_0",
.groups = 0,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0,
.gpio_g_out = 0,
.gpio_b = 0
@@ -109,172 +154,385 @@ static struct interface interfaces[] = {
/* End Non-multiplexed interfaces */
{
.ioif = if_serial_1,
+ .name = "serial_1",
.groups = group_e,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0x0f,
+ .group_f = 0,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0x00
},
{
.ioif = if_serial_2,
+ .name = "serial_2",
.groups = group_b,
+
+ .group_a = 0,
+ .group_b = 0x0f,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x000000c0,
.gpio_g_out = 0x000000c0,
.gpio_b = 0x00
},
{
.ioif = if_serial_3,
+ .name = "serial_3",
.groups = group_c,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0x0f,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0xc0000000,
.gpio_g_out = 0xc0000000,
.gpio_b = 0x00
},
{
.ioif = if_sync_serial_1,
- .groups = group_e | group_f, /* if_sync_serial_1 and if_sync_serial_3
- can be used simultaneously */
+ .name = "sync_serial_1",
+ .groups = group_e | group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0x0f,
+ .group_f = 0x10,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0x10
},
{
.ioif = if_sync_serial_3,
+ .name = "sync_serial_3",
.groups = group_c | group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0x0f,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0x80,
+
.gpio_g_in = 0xc0000000,
.gpio_g_out = 0xc0000000,
.gpio_b = 0x80
},
{
.ioif = if_shared_ram,
+ .name = "shared_ram",
.groups = group_a,
+
+ .group_a = 0x7f8ff,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x0000ff3e,
.gpio_g_out = 0x0000ff38,
.gpio_b = 0x00
},
{
.ioif = if_shared_ram_w,
+ .name = "shared_ram_w",
.groups = group_a | group_d,
+
+ .group_a = 0x7f8ff,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0xff,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x00ffff3e,
.gpio_g_out = 0x00ffff38,
.gpio_b = 0x00
},
{
.ioif = if_par_0,
+ .name = "par_0",
.groups = group_a,
+
+ .group_a = 0x7fbff,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x0000ff3e,
.gpio_g_out = 0x0000ff3e,
.gpio_b = 0x00
},
{
.ioif = if_par_1,
+ .name = "par_1",
.groups = group_d,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0x7feff,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x3eff0000,
.gpio_g_out = 0x3eff0000,
.gpio_b = 0x00
},
{
.ioif = if_par_w,
+ .name = "par_w",
.groups = group_a | group_d,
+
+ .group_a = 0x7fbff,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0xff,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x00ffff3e,
.gpio_g_out = 0x00ffff3e,
.gpio_b = 0x00
},
{
.ioif = if_scsi8_0,
- .groups = group_a | group_b | group_f, /* if_scsi8_0 and if_scsi8_1
- can be used simultaneously */
+ .name = "scsi8_0",
+ .groups = group_a | group_b | group_f,
+
+ .group_a = 0x7ffff,
+ .group_b = 0x0f,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0x10,
+
.gpio_g_in = 0x0000ffff,
.gpio_g_out = 0x0000ffff,
.gpio_b = 0x10
},
{
.ioif = if_scsi8_1,
- .groups = group_c | group_d | group_f, /* if_scsi8_0 and if_scsi8_1
- can be used simultaneously */
+ .name = "scsi8_1",
+ .groups = group_c | group_d | group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0x0f,
+ .group_d = 0x7ffff,
+ .group_e = 0,
+ .group_f = 0x80,
+
.gpio_g_in = 0xffff0000,
.gpio_g_out = 0xffff0000,
.gpio_b = 0x80
},
{
.ioif = if_scsi_w,
+ .name = "scsi_w",
.groups = group_a | group_b | group_d | group_f,
+
+ .group_a = 0x7ffff,
+ .group_b = 0x0f,
+ .group_c = 0,
+ .group_d = 0x601ff,
+ .group_e = 0,
+ .group_f = 0x90,
+
.gpio_g_in = 0x01ffffff,
.gpio_g_out = 0x07ffffff,
.gpio_b = 0x80
},
{
.ioif = if_ata,
+ .name = "ata",
.groups = group_a | group_b | group_c | group_d,
+
+ .group_a = 0x7ffff,
+ .group_b = 0x0f,
+ .group_c = 0x0f,
+ .group_d = 0x7cfff,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0xf9ffffff,
.gpio_g_out = 0xffffffff,
.gpio_b = 0x80
},
{
.ioif = if_csp,
- .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
+ .name = "csp",
+ .groups = group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0xfc,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0xfc
},
{
.ioif = if_i2c,
- .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
+ .name = "i2c",
+ .groups = group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0x03,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0x03
},
{
.ioif = if_usb_1,
+ .name = "usb_1",
.groups = group_e | group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0x0f,
+ .group_f = 0x2c,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0x2c
},
{
.ioif = if_usb_2,
+ .name = "usb_2",
.groups = group_d,
- .gpio_g_in = 0x0e000000,
- .gpio_g_out = 0x3c000000,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0x33e00,
+ .group_f = 0,
+
+ .gpio_g_in = 0x3e000000,
+ .gpio_g_out = 0x0c000000,
.gpio_b = 0x00
},
/* GPIO pins */
{
.ioif = if_gpio_grp_a,
+ .name = "gpio_a",
.groups = group_a,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x0000ff3f,
.gpio_g_out = 0x0000ff3f,
.gpio_b = 0x00
},
{
.ioif = if_gpio_grp_b,
+ .name = "gpio_b",
.groups = group_b,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x000000c0,
.gpio_g_out = 0x000000c0,
.gpio_b = 0x00
},
{
.ioif = if_gpio_grp_c,
+ .name = "gpio_c",
.groups = group_c,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0xc0000000,
.gpio_g_out = 0xc0000000,
.gpio_b = 0x00
},
{
.ioif = if_gpio_grp_d,
+ .name = "gpio_d",
.groups = group_d,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x3fff0000,
.gpio_g_out = 0x3fff0000,
.gpio_b = 0x00
},
{
.ioif = if_gpio_grp_e,
+ .name = "gpio_e",
.groups = group_e,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0x00
},
{
.ioif = if_gpio_grp_f,
+ .name = "gpio_f",
.groups = group_f,
+
+ .group_a = 0,
+ .group_b = 0,
+ .group_c = 0,
+ .group_d = 0,
+ .group_e = 0,
+ .group_f = 0,
+
.gpio_g_in = 0x00000000,
.gpio_g_out = 0x00000000,
.gpio_b = 0xff
@@ -284,11 +542,13 @@ static struct interface interfaces[] = {
static struct watcher *watchers = NULL;
+/* The pins that are free to use in the GPIO ports. */
static unsigned int gpio_in_pins = 0xffffffff;
static unsigned int gpio_out_pins = 0xffffffff;
static unsigned char gpio_pb_pins = 0xff;
static unsigned char gpio_pa_pins = 0xff;
+/* Identifiers for the owners of the GPIO pins. */
static enum cris_io_interface gpio_pa_owners[8];
static enum cris_io_interface gpio_pb_owners[8];
static enum cris_io_interface gpio_pg_owners[32];
@@ -338,13 +598,15 @@ int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id
struct if_group *grp;
unsigned char group_set;
unsigned long flags;
+ int res = 0;
(void)cris_io_interface_init();
DBG(printk("cris_request_io_interface(%d, \"%s\")\n", ioif, device_id));
if ((ioif >= if_max_interfaces) || (ioif < 0)) {
- printk(KERN_CRIT "cris_request_io_interface: Bad interface %u submitted for %s\n",
+ printk(KERN_CRIT "cris_request_io_interface: Bad interface "
+ "%u submitted for %s\n",
ioif,
device_id);
return -EINVAL;
@@ -353,59 +615,69 @@ int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id
local_irq_save(flags);
if (interfaces[ioif].used) {
- local_irq_restore(flags);
- printk(KERN_CRIT "cris_io_interface: Cannot allocate interface for %s, in use by %s\n",
+ printk(KERN_CRIT "cris_io_interface: Cannot allocate interface "
+ "%s for %s, in use by %s\n",
+ interfaces[ioif].name,
device_id,
interfaces[ioif].owner);
- return -EBUSY;
+ res = -EBUSY;
+ goto exit;
}
- /* Check that all required groups are free before allocating, */
+ /* Check that all required pins in the used groups are free
+ * before allocating. */
group_set = interfaces[ioif].groups;
while (NULL != (grp = get_group(group_set))) {
- if (grp->used) {
- if (grp->group == group_f) {
- if ((if_sync_serial_1 == ioif) ||
- (if_sync_serial_3 == ioif)) {
- if ((grp->owner != if_sync_serial_1) &&
- (grp->owner != if_sync_serial_3)) {
- local_irq_restore(flags);
- return -EBUSY;
- }
- } else if ((if_scsi8_0 == ioif) ||
- (if_scsi8_1 == ioif)) {
- if ((grp->owner != if_scsi8_0) &&
- (grp->owner != if_scsi8_1)) {
- local_irq_restore(flags);
- return -EBUSY;
- }
- }
- } else {
- local_irq_restore(flags);
- return -EBUSY;
- }
+ unsigned int if_group_use = 0;
+
+ switch (grp->group) {
+ case group_a:
+ if_group_use = interfaces[ioif].group_a;
+ break;
+ case group_b:
+ if_group_use = interfaces[ioif].group_b;
+ break;
+ case group_c:
+ if_group_use = interfaces[ioif].group_c;
+ break;
+ case group_d:
+ if_group_use = interfaces[ioif].group_d;
+ break;
+ case group_e:
+ if_group_use = interfaces[ioif].group_e;
+ break;
+ case group_f:
+ if_group_use = interfaces[ioif].group_f;
+ break;
+ default:
+ BUG_ON(1);
}
+
+ if (if_group_use & grp->used) {
+ printk(KERN_INFO "cris_request_io_interface: group "
+ "%s needed by %s not available\n",
+ grp->name, interfaces[ioif].name);
+ res = -EBUSY;
+ goto exit;
+ }
+
group_set = clear_group_from_set(group_set, grp);
}
/* Are the required GPIO pins available too? */
- if (((interfaces[ioif].gpio_g_in & gpio_in_pins) != interfaces[ioif].gpio_g_in) ||
- ((interfaces[ioif].gpio_g_out & gpio_out_pins) != interfaces[ioif].gpio_g_out) ||
- ((interfaces[ioif].gpio_b & gpio_pb_pins) != interfaces[ioif].gpio_b)) {
- local_irq_restore(flags);
- printk(KERN_CRIT "cris_request_io_interface: Could not get required pins for interface %u\n",
- ioif);
- return -EBUSY;
- }
-
- /* All needed I/O pins and pin groups are free, allocate. */
- group_set = interfaces[ioif].groups;
- while (NULL != (grp = get_group(group_set))) {
- grp->used = 1;
- grp->owner = ioif;
- group_set = clear_group_from_set(group_set, grp);
+ if (((interfaces[ioif].gpio_g_in & gpio_in_pins) !=
+ interfaces[ioif].gpio_g_in) ||
+ ((interfaces[ioif].gpio_g_out & gpio_out_pins) !=
+ interfaces[ioif].gpio_g_out) ||
+ ((interfaces[ioif].gpio_b & gpio_pb_pins) !=
+ interfaces[ioif].gpio_b)) {
+ printk(KERN_CRIT "cris_request_io_interface: Could not get "
+ "required pins for interface %u\n", ioif);
+ res = -EBUSY;
+ goto exit;
}
+ /* Check which registers need to be reconfigured. */
gens = genconfig_shadow;
gens_ii = gen_config_ii_shadow;
@@ -495,9 +767,43 @@ int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id
set_gen_config = 0;
break;
default:
- panic("cris_request_io_interface: Bad interface %u submitted for %s\n",
- ioif,
- device_id);
+ printk(KERN_INFO "cris_request_io_interface: Bad interface "
+ "%u submitted for %s\n",
+ ioif, device_id);
+ res = -EBUSY;
+ goto exit;
+ }
+
+ /* All needed I/O pins and pin groups are free, allocate. */
+ group_set = interfaces[ioif].groups;
+ while (NULL != (grp = get_group(group_set))) {
+ unsigned int if_group_use = 0;
+
+ switch (grp->group) {
+ case group_a:
+ if_group_use = interfaces[ioif].group_a;
+ break;
+ case group_b:
+ if_group_use = interfaces[ioif].group_b;
+ break;
+ case group_c:
+ if_group_use = interfaces[ioif].group_c;
+ break;
+ case group_d:
+ if_group_use = interfaces[ioif].group_d;
+ break;
+ case group_e:
+ if_group_use = interfaces[ioif].group_e;
+ break;
+ case group_f:
+ if_group_use = interfaces[ioif].group_f;
+ break;
+ default:
+ BUG_ON(1);
+ }
+ grp->used |= if_group_use;
+
+ group_set = clear_group_from_set(group_set, grp);
}
interfaces[ioif].used = 1;
@@ -516,25 +822,28 @@ int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id
*R_GEN_CONFIG_II = gen_config_ii_shadow;
}
- DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
- gpio_in_pins, gpio_out_pins, gpio_pb_pins));
- DBG(printk("grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
- interfaces[ioif].gpio_g_in,
- interfaces[ioif].gpio_g_out,
- interfaces[ioif].gpio_b));
+ DBG(printk(KERN_DEBUG "GPIO pins: available before: "
+ "g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
+ gpio_in_pins, gpio_out_pins, gpio_pb_pins));
+ DBG(printk(KERN_DEBUG
+ "grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
+ interfaces[ioif].gpio_g_in,
+ interfaces[ioif].gpio_g_out,
+ interfaces[ioif].gpio_b));
gpio_in_pins &= ~interfaces[ioif].gpio_g_in;
gpio_out_pins &= ~interfaces[ioif].gpio_g_out;
gpio_pb_pins &= ~interfaces[ioif].gpio_b;
- DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
- gpio_in_pins, gpio_out_pins, gpio_pb_pins));
+ DBG(printk(KERN_DEBUG "GPIO pins: available after: "
+ "g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
+ gpio_in_pins, gpio_out_pins, gpio_pb_pins));
+exit:
local_irq_restore(flags);
-
- notify_watchers();
-
- return 0;
+ if (res == 0)
+ notify_watchers();
+ return res;
}
@@ -560,43 +869,35 @@ void cris_free_io_interface(enum cris_io_interface ioif)
}
group_set = interfaces[ioif].groups;
while (NULL != (grp = get_group(group_set))) {
- if (grp->group == group_f) {
- switch (ioif)
- {
- case if_sync_serial_1:
- if ((grp->owner == if_sync_serial_1) &&
- interfaces[if_sync_serial_3].used) {
- grp->owner = if_sync_serial_3;
- } else
- grp->used = 0;
- break;
- case if_sync_serial_3:
- if ((grp->owner == if_sync_serial_3) &&
- interfaces[if_sync_serial_1].used) {
- grp->owner = if_sync_serial_1;
- } else
- grp->used = 0;
- break;
- case if_scsi8_0:
- if ((grp->owner == if_scsi8_0) &&
- interfaces[if_scsi8_1].used) {
- grp->owner = if_scsi8_1;
- } else
- grp->used = 0;
- break;
- case if_scsi8_1:
- if ((grp->owner == if_scsi8_1) &&
- interfaces[if_scsi8_0].used) {
- grp->owner = if_scsi8_0;
- } else
- grp->used = 0;
- break;
- default:
- grp->used = 0;
- }
- } else {
- grp->used = 0;
+ unsigned int if_group_use = 0;
+
+ switch (grp->group) {
+ case group_a:
+ if_group_use = interfaces[ioif].group_a;
+ break;
+ case group_b:
+ if_group_use = interfaces[ioif].group_b;
+ break;
+ case group_c:
+ if_group_use = interfaces[ioif].group_c;
+ break;
+ case group_d:
+ if_group_use = interfaces[ioif].group_d;
+ break;
+ case group_e:
+ if_group_use = interfaces[ioif].group_e;
+ break;
+ case group_f:
+ if_group_use = interfaces[ioif].group_f;
+ break;
+ default:
+ BUG_ON(1);
}
+
+ if ((grp->used & if_group_use) != if_group_use)
+ BUG_ON(1);
+ grp->used = grp->used & ~if_group_use;
+
group_set = clear_group_from_set(group_set, grp);
}
interfaces[ioif].used = 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-21 14:35:03 +0000