i.MX: ocotp: Add imx_ocotp_sense_enable() ...

Add imx_ocotp_sense_enable() function to allow changing that aspect of
OCOTP driver behaviour before calling imx_ocotp_read_field()

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Initialize OCOTP as early as possible ...

On Vybrid SoC OCOTP module contains speed grading information that is
needed to correctly adjust CPU clock to its maxumum rate, so we need to
have this information handy as early as possible.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Add provisions for storing multiple MAC addresses ...

i.MX SoC variants like Vybrid have more than one built-in Ethernet
interface and as a consequence support storing more than one MAC address
in OCOTP module. Add code to create multiple 'mac_addr<n>' parameters as
well as 'mac_addr' as an "alias" to 'mac_addr0' for backwards
compatibility.

Acked-by: Stefan Lengfeld <s.lengfeld@phytec.de>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Move memory reversing into a subroutine ...

Move memory reversing, found in imx_ocotp_get_mac and
imx_ocotp_set_mac, into a subroutine to avoid code duplication.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Add Vybrid support ...

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Account for shadow memory gaps ...

Shadow memory does not have a true 1:1 mapping to fuse address
space. All i.MX6 devices, with exception of i.MX6SL have a 0x100 byte
gap between banks 5 and 6 (or addresses 0x2f and 0x30), so we need to
account for that when reading data from shadow memory.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Remove unused #define ...

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Add i.MX6ul support ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: OCOTP: Add functions to access fuses field wise ...

Add functions to access the OCOTP fuses field wise, similar to what has
been done for the IIM. Also add a i.MX6 fusemap header file.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

i.MX: ocotp: Register regmap against orignal device ...

Register regmap against orignal device passed to probe, this way further
in the code/call-chain cdev's device_node will be correctly populated
and it will be discoverable via cdev_by_device_node()

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

driver: replace dev_request_mem_region with dev_request_mem_resource ...

dev_request_mem_region doesn't work properly one some SoCs on which
PTR_ERR() values clash with valid return values from dev_request_mem_region.
Replace them with dev_request_mem_resource where possible.

This patch has been generated with the following semantic patch:

// <smpl>
@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores)) {
...
-	return PTR_ERR(io);
-}
+	return PTR_ERR(iores);
+}
+io = IOMEM(iores->start);
...+>
}

@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores))
-	return PTR_ERR(io);
-}
+	return PTR_ERR(iores);
+io = IOMEM(iores->start);
...+>
}

@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
-if (IS_ERR(io)) {
-	ret = PTR_ERR(io);
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores)) {
+	ret = PTR_ERR(iores);
...
}
+io = IOMEM(iores->start);
...+>
}

@@
expression d;
expression n;
expression io;
identifier func;
@@
func(...) {
+struct resource *iores;
<+...
-io = dev_request_mem_region(d, n);
+iores = dev_request_mem_resource(d, n);
+if (IS_ERR(iores))
+	return PTR_ERR(iores);
+io = IOMEM(iores->start);
...+>
}

@@
identifier func;
@@
func(...) {
<+...
struct resource *iores;
-struct resource *iores;
...+>
}
// </smpl>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Switch to regmap support ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Fix error bit handling ...

Instead of returning an error when a locked region is read, fill
the result with 0xbadabada to indicate a locked region is read.
This way a md -s /dev/imx-ocotp does not abort when it encounters
locked regions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: make priv the first argument of functions ...

Throughout our codebase the private context pointer is the first
argument to a function. Do this for the ocotp driver aswell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Explicitly access control register ...

Even when the control register has offset 0x0 it's still nice
to use a register define for it. Accessing priv->base directly
just looks wrong.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Fix fusebox size ...

All i.MX6 SoCs except the i.MX6SL have 4kbit fuses. The i.MX6SL has
2kbit fuses. Fix the device size accordingly.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

cdev: When creating a new cdev, initialize device_node ...

If a new cdev doesn't have a device_node defined when passed to
devfs_create(), set it to the device_node of the parent device, if one
exists.

For non-partitions, like ocotp or eeprom devices, this is the correct
thing to do.  Partitions need to use, and do use, a different node.

The code from commit 274e0b8 to set
device_node in ocotp can be removed.

Signed-off-by: Trent Piepho <tpiepho@kymetacorp.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

imx: ocotp: Add code to initialize 'cdev->device_node' ...

In order for cdev_by_device_node() to be able to return approprate
character device for <&ocotp> phandle cdev->device_node needs to be
initialized with dev->device_node. This patche takes care of that

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX6: ocotp: remove useless code ...

cdev->name is initialized to a static string, so no need
to check if it's non NULL.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/imx'

arm: imx: iim/ocotp: fix link error when !CONFIG_NET ...

Don't try to attach mac to device if there is no net support selected.
Fixes:
undefined reference to `dev_add_param_mac' in both iim and ocotp drivers.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Add i.MX6sx compatible entry ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Fix MAC address provider for unaligned addresses ...

The current algorithm assumes the MAC address starts at a 4 byte
aligned address. Unfortunately this is not always the case. On the
i.MX6sx the MAC Address for the second FEC starts at offset 0x632.
The register space for the fuse map has holes, only the 16 byte
aligned words contain data. This means we have to skip the holes.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

resource: Let dev_request_mem_region return an error pointer ...

For all users fix or add the error check.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

imx6: ocotp: Add On-Chip OTP registers write support ...

FUSEs (OTP registers) can be written via /dev/imx-ocotp character device.

For example, writing MAC 12:34:56:78:9A:BC can be performed as
    > mw -l -d /dev/imx-ocotp 0x8c 0x00001234
    > mw -l -d /dev/imx-ocotp 0x88 0x56789ABC
and reading as
    > md -l -s /dev/imx-ocotp 0x88+8
    00000088: 56789ABC 00001234
, where 0x88 (0x22*4) and 0x8C (0x23*4) are offsets of MAC OTP registers.

Notice: FUSEs are PROM, so "0" (unprogrammed) bits
can be replaced with "1" (but not vice versa) only once.

Also, for MAC there are convinient parameters:
    > ocotp0.permanent_write_enable=1
    > ocotp0.mac_addr=12:34:56:78:9A:BC
    imx_ocotp 21bc000.ocotp: reloading shadow registers...
    imx_ocotp 21bc000.ocotp: reloading shadow registers...
    > echo $ocotp0.mac_addr
    12:34:56:78:9A:BC

Signed-off-by: Uladzimir Bely <u.bely@sam-solutions.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: Add missing includes ...

A lot of files rely on include/driver.h including include/of.h (and
this including include/errno.h. include the files explicitly so we can
eventually get rid of including of.h from driver.h

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX6: Add ocotp driver ...

The only functionality at the moment is to register a MAC Address for
an ethernet device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>