This patch fixes stmmac_pltfr_remove function, which is broken because,
it is accessing plat variable via freed memory priv pointer which gets
freed by free_netdev called from stmmac_dvr_remove.

In short this patch caches the plat pointer in local variable before
calling stmmac_dvr_remove to prevent code accessing freed memory.

Without this patch any attempt to remove the stmmac device will fail as
below:

Unregistering eth 0 ...
Unable to handle kernel paging request at virtual address 6b6b6bab
pgd = de5dc000
[6b6b6bab] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP
Modules linked in: cdev(O+)
CPU: 0    Tainted: G           O  (3.3.1_stm24_0210-b2000+ #25)
PC is at stmmac_pltfr_remove+0x2c/0xa0
LR is at stmmac_pltfr_remove+0x28/0xa0
pc : [<c01b8908>]    lr : [<c01b8904>]    psr: 60000013
sp : def6be78  ip : de6c5a00  fp : 00000000
r10: 00000028  r9 : c082d81d  r8 : 00000001
r7 : de65a600  r6 : df81b240  r5 : c0413fd8  r4 : 00000000
r3 : 6b6b6b6b  r2 : def6be6c  r1 : c0355e2b  r0 : 00000020
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 10c53c7d  Table: 5e5dc04a  DAC: 00000015
Process insmod (pid: 738, stack limit = 0xdef6a2f0)
Stack: (0xdef6be78 to 0xdef6c000)
be60:                                                       c0413fe0
c0403658
be80: c0400bb0 c019270c c01926f8 c0191478 00000000 c0414014 c0413fe0
c01914d8
bea0: 00000000 c0413fe0 df8045d0 c019109c c0413fe0 c0400bf0 c0413fd8
c018f04c
bec0: 00000000 bf000000 c0413fd8 c01929a0 c0413fd8 bf000000 00000000
c0192bfc
bee0: bf00009c bf000014 def6a000 c000859c 00000000 00000001 bf00009c
bf00009c
bf00: 00000001 bf00009c 00000001 bf0000e4 de65a600 00000001 c082d81d
c0058cd0
bf20: bf0000a8 c004fbd8 c0056414 c082d815 c02aea20 bf0001f0 00b0b008
e0846208
bf40: c03ec8a0 e0846000 0000db0d e0850604 e08504de e0853a24 00000204
000002d4
bf60: 00000000 00000000 0000001c 0000001d 00000009 00000000 00000006
00000000
bf80: 00000003 f63d4e2e 0000db0d bef02ed8 00000080 c000d2e8 def6a000
00000000
bfa0: 00000000 c000d140 f63d4e2e 0000db0d 00b0b018 0000db0d 00b0b008
b6f4f298
bfc0: f63d4e2e 0000db0d bef02ed8 00000080 00000003 00000000 00010000
00000000
bfe0: 00b0b008 bef02c64 00008d20 b6ef3784 60000010 00b0b018 5a5a5a5a
5a5a5a5a
[<c01b8908>] (stmmac_pltfr_remove+0x2c/0xa0) from [<c019270c>]
(platform_drv_remove+0x14/0x18)
[<c019270c>] (platform_drv_remove+0x14/0x18) from [<c0191478>]
(__device_release_driver+0x64/0xa4)
[<c0191478>] (__device_release_driver+0x64/0xa4) from [<c01914d8>]
(device_release_driver+0x20/0x2c)
[<c01914d8>] (device_release_driver+0x20/0x2c) from [<c019109c>]
(bus_remove_device+0xcc/0xdc)
[<c019109c>] (bus_remove_device+0xcc/0xdc) from [<c018f04c>]
(device_del+0x104/0x160)
[<c018f04c>] (device_del+0x104/0x160) from [<c01929a0>]
(platform_device_del+0x18/0x58)
[<c01929a0>] (platform_device_del+0x18/0x58) from [<c0192bfc>]
(platform_device_unregister+0xc/0x18)
[<c0192bfc>] (platform_device_unregister+0xc/0x18) from [<bf000014>]
(r_init+0x14/0x2c [cdev])
[<bf000014>] (r_init+0x14/0x2c [cdev]) from [<c000859c>]
(do_one_initcall+0x90/0x160)
[<c000859c>] (do_one_initcall+0x90/0x160) from [<c0058cd0>]
(sys_init_module+0x15c4/0x1794)
[<c0058cd0>] (sys_init_module+0x15c4/0x1794) from [<c000d140>]
(ret_fast_syscall+0x0/0x30)
Code: e1a04000 e59f0070 eb039b65 e59636e4 (e5933040)
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Driver probe functions are generally __devinit so they will be
discarded after initialization for non-hotplug kernels.
This was found by a new warning after patch 6a228452 "stmmac: Add
device-tree support" adds a new __devinit function that is called
from stmmac_pltfr_probe.

Without this patch, building socfpga_defconfig results in:

WARNING: drivers/net/ethernet/stmicro/stmmac/stmmac.o(.text+0x5d4c): Section mismatch in reference from the function stmmac_pltfr_probe() to the function .devinit.text:stmmac_probe_config_dt()
The function stmmac_pltfr_probe() references
the function __devinit stmmac_probe_config_dt().
This is often because stmmac_pltfr_probe lacks a __devinit
annotation or the annotation of stmmac_probe_config_dt is wrong.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Acked-by: NStefan Roese <sr@denx.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Because there are multiple variants to the stmmac/dwmac driver, the
dts bindings should be updated to include version of the IP used.
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>
Acked-by: NStefan Roese <sr@denx.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds the Energy Efficient Ethernet support to the stmmac.

Please see the driver's documentation for further details about this support
in the driver.

Thanks also goes to Rayagond Kokatanur for his first implementation.

Note:
 to clearly manage and expose the lpi interrupt status and eee ethtool
 stats I've had to do some modifications to the driver's design and I
 found really useful to move other parts of the code (e.g. mmc irq stat)
 in the main directly. So this means that some core has been reworked
 to introduce the EEE.

v1: initial patch
v2: fixed some sparse issues (typos)
v3: erroneously sent the v2 renamed as v3
v4:
	o Fixed the return value of the stmmac_eee_init as suggested by D.Miller
	o Totally reviewed the ethtool support for EEE
	o Added a new internal parameter to tune the SW timer for TX LPI.
v5: do not change any eee setting in case of the stmmac_ethtool_op_set_eee fails
    (it has to return -EOPNOTSUPP in that case).
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patches fixes the driver when built as dynamic module.
In fact, the platform part cannot be built and the probe fails
(thanks to Bob Liu that reported this bug).

v2: as D. Miller suggested, it is not necessary to make the
pci and the platform code mutually exclusive.
Having both could also help, at built time ,to verify that
all the code is validated and compiles fine.

v3: removed wrong Reviewed-by from the patch
Reported-by: NBob Liu <lliubbo@gmail.com>
cc: Rayagond Kokatanur <rayagond@vayavyalabs.com>
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Adding casts of objects to the same type is unnecessary
and confusing for a human reader.

For example, this cast:

        int y;
        int *p = (int *)&y;

I used the coccinelle script below to find and remove these
unnecessary casts.  I manually removed the conversions this
script produces of casts with __force, __iomem and __user.

@@
type T;
T *p;
@@

-       (T *)p
+       p

A function in atl1e_main.c was passed a const pointer
when it actually modified elements of the structure.

Change the argument to a non-const pointer.

A function in stmmac needed a __force to avoid a sparse
warning.  Added it.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Recently the dma parameters that can be passed from the platform
have been moved from the plat_stmmacenet_data to the stmmac_dma_cfg.

In case of this new structure is not well allocated the driver can
fails. This is an example how this field is managed in ST platforms

static struct stmmac_dma_cfg gmac_dma_setting = {
        .pbl = 32,
};

static struct plat_stmmacenet_data stih415_ethernet_platform_data[] = {
	{
		.dma_cfg = &gmac_dma_setting,
		.has_gmac = 1,
[snip]

This patch so verifies that the dma_cfg passed from the platform.
In case of it is NULL there is no reason that the driver has to fail
and some default values can be passed. These are ok for all the
Synopsys chips and could impact on performances, only.
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
cc: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Freeze and restore can call the custom init/exit functions.
Also the patch adds a custom data field that can be used
for storing platform data useful on restore the embedded
setup (e.g. GPIO, SYSCFG).
Signed-off-by: NFrancesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds support to configure the STMMAC ethernet driver via
device-tree instead of platform_data.

Currently, only the properties needed on SPEAr600 are provided. All
other properties should be added once needed on other platforms.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch moves the MAC HW initialization and
the HW feature verification from the open to the probe
function as D. Miller suggested.
So the patch actually reorganizes and tidies-up some parts of
the driver and indeed fixes some problem when tune its HW features.
These can be overwritten by looking at the HW cap register at
run-time and that generated problems.
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Reviewed-by: NFrancesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Correct spelling "drivr" to "driver" in
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add missing iounmap in error handling code, in a case where the function
already preforms iounmap on some other execution path.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
statement S,S1;
int ret;
@@
e = \(ioremap\|ioremap_nocache\)(...)
... when != iounmap(e)
if (<+...e...+>) S
... when any
    when != iounmap(e)
*if (...)
   { ... when != iounmap(e)
     return ...; }
... when any
iounmap(e);
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds the PCI support (as EXPERIMENTAL)
this has been also tested on XLINX XC2V3000 FF1152AMT0221
D1215994A VIRTEX FPGA board.
To support the PCI bus the main part has been reworked
and both the platform and the PCI specific parts have
been moved into different files.
Signed-off-by: NRayagond Kokatanur <rayagond@vayavyalabs.com>
Signed-off-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>