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linux/arch/cris/arch-v10/kernel/io_interface_mux.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

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// SPDX-License-Identifier: GPL-2.0
/* IO interface mux allocator for ETRAX100LX.
* Copyright 2004-2007, Axis Communications AB
*/
/* C.f. ETRAX100LX Designer's Reference chapter 19.9 */
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <arch/svinto.h>
#include <asm/io.h>
#include <arch/io_interface_mux.h>
#include <arch/system.h>
#define DBG(s)
/* Macro to access ETRAX 100 registers */
#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
IO_STATE_(reg##_, field##_, _##val)
enum io_if_group {
group_a = (1<<0),
group_b = (1<<1),
group_c = (1<<2),
group_d = (1<<3),
group_e = (1<<4),
group_f = (1<<5)
};
struct watcher
{
void (*notify)(const unsigned int gpio_in_available,
const unsigned int gpio_out_available,
const unsigned char pa_available,
const unsigned char pb_available);
struct watcher *next;
};
struct if_group
{
enum io_if_group group;
/* 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;
};
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,
}
};
/* The order in the array must match the order of enum
* cris_io_interface in io_interface_mux.h */
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
},
/* 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,
.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,
.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,
.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,
.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,
.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,
.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
}
/* Array end */
};
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];
static int cris_io_interface_init(void);
static unsigned char clear_group_from_set(const unsigned char groups, struct if_group *group)
{
return (groups & ~group->group);
}
static struct if_group *get_group(const unsigned char groups)
{
int i;
for (i = 0; i < ARRAY_SIZE(if_groups); i++) {
if (groups & if_groups[i].group) {
return &if_groups[i];
}
}
return NULL;
}
static void notify_watchers(void)
{
struct watcher *w = watchers;
DBG(printk("io_interface_mux: notifying watchers\n"));
while (NULL != w) {
w->notify((const unsigned int)gpio_in_pins,
(const unsigned int)gpio_out_pins,
(const unsigned char)gpio_pa_pins,
(const unsigned char)gpio_pb_pins);
w = w->next;
}
}
int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id)
{
int set_gen_config = 0;
int set_gen_config_ii = 0;
unsigned long int gens;
unsigned long int gens_ii;
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",
ioif,
device_id);
return -EINVAL;
}
local_irq_save(flags);
if (interfaces[ioif].used) {
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);
res = -EBUSY;
goto exit;
}
/* 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))) {
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)) {
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;
set_gen_config = 1;
switch (ioif)
{
/* Begin Non-multiplexed interfaces */
case if_eth:
/* fall through */
case if_serial_0:
set_gen_config = 0;
break;
/* End Non-multiplexed interfaces */
case if_serial_1:
set_gen_config_ii = 1;
SETS(gens_ii, R_GEN_CONFIG_II, sermode1, async);
break;
case if_serial_2:
SETS(gens, R_GEN_CONFIG, ser2, select);
break;
case if_serial_3:
SETS(gens, R_GEN_CONFIG, ser3, select);
set_gen_config_ii = 1;
SETS(gens_ii, R_GEN_CONFIG_II, sermode3, async);
break;
case if_sync_serial_1:
set_gen_config_ii = 1;
SETS(gens_ii, R_GEN_CONFIG_II, sermode1, sync);
break;
case if_sync_serial_3:
SETS(gens, R_GEN_CONFIG, ser3, select);
set_gen_config_ii = 1;
SETS(gens_ii, R_GEN_CONFIG_II, sermode3, sync);
break;
case if_shared_ram:
SETS(gens, R_GEN_CONFIG, mio, select);
break;
case if_shared_ram_w:
SETS(gens, R_GEN_CONFIG, mio_w, select);
break;
case if_par_0:
SETS(gens, R_GEN_CONFIG, par0, select);
break;
case if_par_1:
SETS(gens, R_GEN_CONFIG, par1, select);
break;
case if_par_w:
SETS(gens, R_GEN_CONFIG, par0, select);
SETS(gens, R_GEN_CONFIG, par_w, select);
break;
case if_scsi8_0:
SETS(gens, R_GEN_CONFIG, scsi0, select);
break;
case if_scsi8_1:
SETS(gens, R_GEN_CONFIG, scsi1, select);
break;
case if_scsi_w:
SETS(gens, R_GEN_CONFIG, scsi0, select);
SETS(gens, R_GEN_CONFIG, scsi0w, select);
break;
case if_ata:
SETS(gens, R_GEN_CONFIG, ata, select);
break;
case if_csp:
/* fall through */
case if_i2c:
set_gen_config = 0;
break;
case if_usb_1:
SETS(gens, R_GEN_CONFIG, usb1, select);
break;
case if_usb_2:
SETS(gens, R_GEN_CONFIG, usb2, select);
break;
case if_gpio_grp_a:
/* GPIO groups are only accounted, don't do configuration changes. */
/* fall through */
case if_gpio_grp_b:
/* fall through */
case if_gpio_grp_c:
/* fall through */
case if_gpio_grp_d:
/* fall through */
case if_gpio_grp_e:
/* fall through */
case if_gpio_grp_f:
set_gen_config = 0;
break;
default:
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;
interfaces[ioif].owner = (char*)device_id;
if (set_gen_config) {
volatile int i;
genconfig_shadow = gens;
*R_GEN_CONFIG = genconfig_shadow;
/* Wait 12 cycles before doing any DMA command */
for(i = 6; i > 0; i--)
nop();
}
if (set_gen_config_ii) {
gen_config_ii_shadow = gens_ii;
*R_GEN_CONFIG_II = gen_config_ii_shadow;
}
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(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);
if (res == 0)
notify_watchers();
return res;
}
void cris_free_io_interface(enum cris_io_interface ioif)
{
struct if_group *grp;
unsigned char group_set;
unsigned long flags;
(void)cris_io_interface_init();
if ((ioif >= if_max_interfaces) || (ioif < 0)) {
printk(KERN_CRIT "cris_free_io_interface: Bad interface %u\n",
ioif);
return;
}
local_irq_save(flags);
if (!interfaces[ioif].used) {
printk(KERN_CRIT "cris_free_io_interface: Freeing free interface %u\n",
ioif);
local_irq_restore(flags);
return;
}
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);
}
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;
interfaces[ioif].owner = NULL;
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("freeing 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));
local_irq_restore(flags);
notify_watchers();
}
/* Create a bitmask from bit 0 (inclusive) to bit stop_bit
(non-inclusive). stop_bit == 0 returns 0x0 */
static inline unsigned int create_mask(const unsigned stop_bit)
{
/* Avoid overflow */
if (stop_bit >= 32) {
return 0xffffffff;
}
return (1<<stop_bit)-1;
}
/* port can be 'a', 'b' or 'g' */
int cris_io_interface_allocate_pins(const enum cris_io_interface ioif,
const char port,
const unsigned start_bit,
const unsigned stop_bit)
{
unsigned int i;
unsigned int mask = 0;
unsigned int tmp_mask;
unsigned long int flags;
enum cris_io_interface *owners;
(void)cris_io_interface_init();
DBG(printk("cris_io_interface_allocate_pins: if=%d port=%c start=%u stop=%u\n",
ioif, port, start_bit, stop_bit));
if (!((start_bit <= stop_bit) &&
((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
((port == 'g') && (stop_bit < 32))))) {
return -EINVAL;
}
mask = create_mask(stop_bit + 1);
tmp_mask = create_mask(start_bit);
mask &= ~tmp_mask;
DBG(printk("cris_io_interface_allocate_pins: port=%c start=%u stop=%u mask=0x%08x\n",
port, start_bit, stop_bit, mask));
local_irq_save(flags);
switch (port) {
case 'a':
if ((gpio_pa_pins & mask) != mask) {
local_irq_restore(flags);
return -EBUSY;
}
owners = gpio_pa_owners;
gpio_pa_pins &= ~mask;
break;
case 'b':
if ((gpio_pb_pins & mask) != mask) {
local_irq_restore(flags);
return -EBUSY;
}
owners = gpio_pb_owners;
gpio_pb_pins &= ~mask;
break;
case 'g':
if (((gpio_in_pins & mask) != mask) ||
((gpio_out_pins & mask) != mask)) {
local_irq_restore(flags);
return -EBUSY;
}
owners = gpio_pg_owners;
gpio_in_pins &= ~mask;
gpio_out_pins &= ~mask;
break;
default:
local_irq_restore(flags);
return -EINVAL;
}
for (i = start_bit; i <= stop_bit; i++) {
owners[i] = ioif;
}
local_irq_restore(flags);
notify_watchers();
return 0;
}
/* port can be 'a', 'b' or 'g' */
int cris_io_interface_free_pins(const enum cris_io_interface ioif,
const char port,
const unsigned start_bit,
const unsigned stop_bit)
{
unsigned int i;
unsigned int mask = 0;
unsigned int tmp_mask;
unsigned long int flags;
enum cris_io_interface *owners;
(void)cris_io_interface_init();
if (!((start_bit <= stop_bit) &&
((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
((port == 'g') && (stop_bit < 32))))) {
return -EINVAL;
}
mask = create_mask(stop_bit + 1);
tmp_mask = create_mask(start_bit);
mask &= ~tmp_mask;
DBG(printk("cris_io_interface_free_pins: port=%c start=%u stop=%u mask=0x%08x\n",
port, start_bit, stop_bit, mask));
local_irq_save(flags);
switch (port) {
case 'a':
if ((~gpio_pa_pins & mask) != mask) {
local_irq_restore(flags);
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
}
owners = gpio_pa_owners;
break;
case 'b':
if ((~gpio_pb_pins & mask) != mask) {
local_irq_restore(flags);
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
}
owners = gpio_pb_owners;
break;
case 'g':
if (((~gpio_in_pins & mask) != mask) ||
((~gpio_out_pins & mask) != mask)) {
local_irq_restore(flags);
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
}
owners = gpio_pg_owners;
break;
default:
owners = NULL; /* Cannot happen. Shut up, gcc! */
}
for (i = start_bit; i <= stop_bit; i++) {
if (owners[i] != ioif) {
printk(KERN_CRIT "cris_io_interface_free_pins: Freeing unowned pins");
}
}
/* All was ok, change data. */
switch (port) {
case 'a':
gpio_pa_pins |= mask;
break;
case 'b':
gpio_pb_pins |= mask;
break;
case 'g':
gpio_in_pins |= mask;
gpio_out_pins |= mask;
break;
}
for (i = start_bit; i <= stop_bit; i++) {
owners[i] = if_unclaimed;
}
local_irq_restore(flags);
notify_watchers();
return 0;
}
int cris_io_interface_register_watcher(void (*notify)(const unsigned int gpio_in_available,
const unsigned int gpio_out_available,
const unsigned char pa_available,
const unsigned char pb_available))
{
struct watcher *w;
(void)cris_io_interface_init();
if (NULL == notify) {
return -EINVAL;
}
w = kmalloc(sizeof(*w), GFP_KERNEL);
if (!w) {
return -ENOMEM;
}
w->notify = notify;
w->next = watchers;
watchers = w;
w->notify((const unsigned int)gpio_in_pins,
(const unsigned int)gpio_out_pins,
(const unsigned char)gpio_pa_pins,
(const unsigned char)gpio_pb_pins);
return 0;
}
void cris_io_interface_delete_watcher(void (*notify)(const unsigned int gpio_in_available,
const unsigned int gpio_out_available,
const unsigned char pa_available,
const unsigned char pb_available))
{
struct watcher *w = watchers, *prev = NULL;
(void)cris_io_interface_init();
while ((NULL != w) && (w->notify != notify)){
prev = w;
w = w->next;
}
if (NULL != w) {
if (NULL != prev) {
prev->next = w->next;
} else {
watchers = w->next;
}
kfree(w);
return;
}
printk(KERN_WARNING "cris_io_interface_delete_watcher: Deleting unknown watcher 0x%p\n", notify);
}
static int cris_io_interface_init(void)
{
static int first = 1;
int i;
if (!first) {
return 0;
}
first = 0;
for (i = 0; i<8; i++) {
gpio_pa_owners[i] = if_unclaimed;
gpio_pb_owners[i] = if_unclaimed;
gpio_pg_owners[i] = if_unclaimed;
}
for (; i<32; i++) {
gpio_pg_owners[i] = if_unclaimed;
}
return 0;
}
module_init(cris_io_interface_init);
EXPORT_SYMBOL(cris_request_io_interface);
EXPORT_SYMBOL(cris_free_io_interface);
EXPORT_SYMBOL(cris_io_interface_allocate_pins);
EXPORT_SYMBOL(cris_io_interface_free_pins);
EXPORT_SYMBOL(cris_io_interface_register_watcher);
EXPORT_SYMBOL(cris_io_interface_delete_watcher);
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