Commit graph

296 commits

Author SHA1 Message Date
Simon Glass
f7ae49fc4f common: Drop log.h from common header
Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 21:19:18 -04:00
Simon Glass
0914011310 command: Remove the cmd_tbl_t typedef
We should not use typedefs in U-Boot. They cannot be used as forward
declarations which means that header files must include the full header to
access them.

Drop the typedef and rename the struct to remove the _s suffix which is
now not useful.

This requires quite a few header-file additions.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 18:36:55 -04:00
Simon Glass
691d719db7 common: Drop init.h from common header
Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 17:33:33 -04:00
Simon Glass
90526e9fba common: Drop net.h from common header
Move this header out of the common header. Network support is used in
quite a few places but it still does not warrant blanket inclusion.

Note that this net.h header itself has quite a lot in it. It could be
split into the driver-mode support, functions, structures, checksumming,
etc.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 17:33:31 -04:00
Ley Foon Tan
b9d1671829 arm: socfpga: stratix10: Fix incorrect CLKMGR_S10_PERPLL_BYPASS offset
Offset value for CLKMGR_S10_PERPLL_BYPASS should be 0xb0, fix it.

Reported-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-04-27 09:14:52 +02:00
Harald Seiler
e97590654a spl: mmc: Rename spl_boot_mode() to spl_mmc_boot_mode()
The function's name is misleading as one might think it is used
generally to select the boot-mode when in reality it is only used by the
MMC driver to find out in what way it should try reading U-Boot Proper
from a device (either using a filesystem, a raw sector/partition, or an
eMMC boot partition).

Rename it to spl_mmc_boot_mode() to make it more obvious what this
function is about.

Link: https://lists.denx.de/pipermail/u-boot/2020-April/405979.html
Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2020-04-22 20:41:57 +08:00
Ley Foon Tan
3958ef307e arm: socfpga: arria10: Enable cache driver in SPL
Adding "u-boot,dm-pre-reloc" and enable CONFIG_SPL_CACHE
to enable cache driver in SPL.

This fixed error below in SPL:
cache controller driver NOT found!

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-04-13 13:49:51 +02:00
Ley Foon Tan
3d884ff470 arm: socfpga: arria10: Add save_boot_params()
Add save_boot_params() to save reset status value from bootrom.

Bootrom will clear the status register in reset manager and stores the
reset status value in shared memory. Bootrom stores shared data at last
2KB of onchip RAM.

This function save reset status provided by bootrom to rst_mgr_status.
More information about reset status register value can be found in reset
manager register description.

When running in debugger without bootrom, r0 to r3 are random values.
So, skip save the value when r0 is not bootrom shared data address.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-03-31 02:52:38 +02:00
Ley Foon Tan
69f9c8bab8 arm: socfpga: Add onchip RAM size macro
Add OCRAM size macro for Gen5 and Arria 10.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-03-31 02:52:38 +02:00
Holger Brunck
468ba8d00b ARM: socfpga: Add initial support for the ABB SECU board
Add initial support for the ABB SECU board, which is an ArriaV-based
SoCFPGA system with ethernet and booting from Denali NAND.

Signed-off-by: Holger Brunck <holger.brunck@ch.abb.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-03-03 22:11:36 +01:00
Tom Rini
9a8942b53d sandbox conversion to SDL2
TPM TEE driver
 Various minor sandbox video enhancements
 New driver model core utility functions
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Merge tag 'dm-pull-6feb20' of https://gitlab.denx.de/u-boot/custodians/u-boot-dm

sandbox conversion to SDL2
TPM TEE driver
Various minor sandbox video enhancements
New driver model core utility functions
2020-02-11 10:58:41 -05:00
Simon Glass
336d4615f8 dm: core: Create a new header file for 'compat' features
At present dm/device.h includes the linux-compatible features. This
requires including linux/compat.h which in turn includes a lot of headers.
One of these is malloc.h which we thus end up including in every file in
U-Boot. Apart from the inefficiency of this, it is problematic for sandbox
which needs to use the system malloc() in some files.

Move the compatibility features into a separate header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-02-05 19:33:46 -07:00
Marek Vasut
9a5a90ad9b ddr: altera: Add DDR2 support to Gen5 driver
Add DDR2 support to Gen5 DRAM driver. As the DDR2 macro names generated
by Quartus are named differently than the DDR3 ones, use anon unions to
store them in the same structures, without growing their size.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-02-05 03:01:57 +01:00
Marek Vasut
707c36e2af ARM: socfpga: Drop last use of socfpga_reset_manager
This particular chunk of code was not updated, likely due to the order
in which the patches were posted and applied. Fix this missing part.

Fixes: bb25aca134 ("arm: socfpga: Convert reset manager from struct to defines")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
2020-02-03 09:26:14 +01:00
Simon Glass
db41d65a97 common: Move hang() to the same header as panic()
At present panic() is in the vsprintf.h header file. That does not seem
like an obvious choice for hang(), even though it relates to panic(). So
let's put hang() in its own header.

Signed-off-by: Simon Glass <sjg@chromium.org>
[trini: Migrate a few more files]
Signed-off-by: Tom Rini <trini@konsulko.com>
2020-01-17 17:53:40 -05:00
Simon Glass
9a3b4ceb37 common: Move reset_cpu() to the CPU header
Move this function out of common.h and into a relevant header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-01-17 14:02:31 -05:00
Thor Thayer
62079b2211 arm: socfpga: stratix10: Enable SMMU access
Enable TCU access through the Stratix10 CCU so that the
SMMU can access the SDRAM.

Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2020-01-07 14:38:34 +01:00
Ley Foon Tan
a76b711dea arm: socfpga: agilex: Enable Agilex SoC build
Add build support for Agilex SoC.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:34 +01:00
Ley Foon Tan
594cacf063 arm: socfpga: agilex: Add SPL for Agilex SoC
Add SPL support for Agilex SoC.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
a6e5b06bea arm: agilex: Add clock handoff offset for Agilex
Add clock handoff offset for Agilex. Remove S10 prefix to avoid confusion.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
b4a20cb300 arm: socfpga: agilex: Add clock wrapper functions
Add clock wrapper functions call to clock DM functions to get clock
frequency and used in cm_print_clock_quick_summary().

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
c168fc71a3 clk: agilex: Add clock driver for Agilex
Add clock manager driver for Agilex. Provides clock initialization
and get_rate functions.

agilex-clock.h is from Linux commit ID cd2e1ad12247.

Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
20322cea64 arm: socfpga: Fix CLKMGR_INTOSC_HZ to 400MHz
CLKMGR_INTOSC_HZ should be 400MHz, instead of 460MHz.
Removed also unused macros CLKMGR_EOSC1_HZ and CLKMGR_FPGA_CLK_HZ.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
38229994af arm: socfpga: Move Stratix10 and Agilex clock manager common code
Move Stratix10 and Agilex clock manager common code to new header file.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
975f66bb57 arm: socfpga: agilex: Add system manager support
Add system manager support for Agilex.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
2fd1dc5593 arm: socfpga: Move Stratix10 and Agilex system manager common code
Move Stratix10 and Agilex system manager common code to
system_manager_soc64.h. Changed macros to use SYSMGR_SOC64_*.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
50278d4ade arm: socfpga: agilex: Add reset manager support
Add reset manager support for Agilex.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
fd5374aa29 arm: socfpga: Move Stratix10 and Agilex reset manager common code
Move Stratix10 and Agilex reset manager common code to
reset_manager_soc64.h. Changed macros to RSTMGR_SOC64_*.

Remove unused RSTMGR_XXX defines.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
8b7962a349 arm: socfpga: Move firewall code to firewall file
Move firewall related code to new firewall.c, to share
code in Stratix 10 and Agilex.

SDMMC will transfer data to OCRAM in SPL. So, enable privilege for SDMMC
to allow DMA transfer to OCRAM.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
2145e611fc arm: socfpga: agilex: Add base address for Intel Agilex SoC
Add base address for Intel Agilex SoC.

Reuse base_addr_s10.h for Agilex, only one base address is
different from S10.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
94172c7961 arm: socfpga: Convert clock manager from struct to defines
Convert clock manager for Gen5, Arria 10 and Stratix 10 from struct
to defines.

Change to get clock manager base address from DT node instead of using
#define.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
db5741f7a8 arm: socfpga: Convert system manager from struct to defines
Convert system manager for Gen5, Arria 10 and Stratix 10 from struct
to defines.

Change to get system manager base address from DT node instead of
using #define.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Ley Foon Tan
bb25aca134 arm: socfpga: Convert reset manager from struct to defines
Convert reset manager for Gen5, Arria 10 and Stratix 10 from struct
to defines.

Change to get reset manager base address from DT node instead of using
#define.

spl_early_init() initializes the DT setup. So, move spl_early_init() to
beginning of function and before get base address from DT.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2020-01-07 14:38:33 +01:00
Simon Glass
9edefc2776 common: Move some cache and MMU functions out of common.h
These functions belong in cpu_func.h. Another option would be cache.h
but that code uses driver model and we have not moved these cache
functions to use driver model. Since they are CPU-related it seems
reasonable to put them here.

Move them over.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:55 -05:00
Simon Glass
1045315df0 common: Move get_ticks() function out of common.h
This function belongs in time.h so move it over and add a comment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:23:13 -05:00
Marek Vasut
a1a9843a29 ARM: socfpga: Unreset NAND in SPL on Gen5
In case the SPL on Gen5 loads U-Boot from NAND, unreset the NAND IP
explicitly in the platform code as the denali-spl driver is not aware
of DM at all.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2019-11-25 13:12:56 +01:00
Marek Vasut
2007a730ee ARM: socfpga: Add ArriaV ST/SX ID
Add new FPGA ID for ArriaV ST/D3 or SX/B3 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2019-11-25 13:12:56 +01:00
Marek Vasut
97a72bc286 ARM: socfpga: Purge pending transactions upon enabling bridges on Gen5
On Gen5, when the FPGA is loaded and there was some prior interaction
between the HPS and the FPGA via bridges (e.g. Linux was running and
using some of the IPs in the FPGA) followed by warm reset, it has been
observed that there might be outstanding unfinished transactions. This
leads to an obscure misbehavior of the bridge.

When the bridge is enabled again in U-Boot and there are outstanding
transactions, a read from within the bridge address range would return
a result of the previous read instead. Example:
=> bridge enable ; md 0xff200000 1
ff200000: 1234abcd
=> bridge enable ; md 0xff200010 1
ff200010: 5678dcba <------- this is in fact a value which is stored in
                            a memory at 0xff200000
=> bridge enable ; md 0xff200000 1
ff200000: 90effe09 <------- this is in fact a value which is stored in
                            a memory at 0xff200010
and so it continues. Issuing a write does lock the system up completely.

This patch opens the FPGA bridges in 'bridge enable' command, the tears
them down again, and then opens them again. This allows these outstanding
transactions to complete and makes this misbehavior go away.

However, it is not entirely clear whether this is the correct solution.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2019-11-25 13:12:56 +01:00
Marek Vasut
446cf811c5 ARM: socfpga: Actually put bridges into reset on Gen5 in bridge disable
On Gen5, the 'bridge disable' command write 0x0 to brgmodrst register,
which releases all bridges from reset, instead of putting all bridges
into reset. Fix this by inverting the mask and actually putting the
bridges into reset.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-11-25 13:12:55 +01:00
Simon Goldschmidt
26fb85f4ab socfpga: fix include guard in misc.h (arch vs. global)
The file arch/arm/mach-socfpga/include/mach/misc.h used the same include
guard as the global include/misc.h.

Fix this by giving the arch file an arch prefix.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
2019-11-20 22:32:00 +01:00
Simon Goldschmidt
a43b60cc78 arm: socfpga: gen5: fix ERR_PTR_OFFSET
The default implementation of ERR_PTR/PTR_ERR maps errno values at the
and of the address range (e.g. -EINVAL/-22 gets 0xFFFFFFEA).

For socfpga gen5 SPL, this doesn't really work, as the heap is nearly
at the end of the 32 bit address range.

This patch adjusts the ERR_PTR_OFFSET to map errno values into the range
of the Boot ROM, which should not be used for valid pointers.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-11-07 18:01:13 -05:00
Marek Vasut
94a16b8e70 ARM: socfpga: vining_fpga: Rename VINING|FPGA
The company Samtec was merged into Softing, migrate the board over to
the new name and update copyright headers.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Silvio Fricke <silvio.fricke@softing.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-10-09 22:54:17 +02:00
Simon Glass
b51882d007 spl: Convert CONFIG_SPL_SIZE_LIMIT to hex
This is currently a decimal value which is not as convenient or
meaningful. Also U-Boot tends to use hex everywhere.

Convert this option to hex and add a comment for the size_check macro.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Acked-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: correct the typo in the commit title]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
2019-10-08 13:57:45 +08:00
Simon Glass
27084c03d3 spl: Allow tiny printf() to be controlled in SPL and TPL
At present there is only one control for this and it is used for both SPL
and TPL. But SPL might have a lot more space than TPL so the extra cost of
a full printf() might be acceptable.

Split the option into two, providing separate SPL and TPL controls. The
TPL setting defaults to the same as SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-10-08 13:57:45 +08:00
Simon Goldschmidt
a89441a74f arm: socfpga: gen5: don't zero bss in board_init_f()
The socfpga gen5 SPL manually zeroed bss in board_init_f(). Now that the
DDR driver does not use bss any more, bss is not used before board_init_r()
and we can remove this hack.

bss is normally zeroed by crt0.S, but after board_init_f(), before
board_init_r(). socfpga just had this double-zeroing because it invalidly
used bss in board_init_f() already (during DDR initialization).

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-08-15 08:50:02 +02:00
Simon Glass
9fb625ce05 env: Move env_set() to env.h
Move env_set() over to the new header file.

Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
2019-08-11 16:43:41 -04:00
Simon Goldschmidt
ef72ba0b87 sysreset: add support for socfpga sysreset
This moves sysreset support for socfgpa from ad-hoc code in mach-socfpga
to a UCLASS_SYSRESET based dm driver.

A side effect is that gen5 and a10 can now select between cold and warm
reset.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-07-21 12:45:10 +02:00
Simon Goldschmidt
cb20fe8f0b arm: socfpga: rst: add register definition for cold reset
This adds a define for the bit in rstmgr's ctrl regiser that issues
a cold reset (we had a define for the warm reset bit only) in preparation
for a proper sysrese driver.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Series changes: 2
- separate this patch to the register descriptions from the actual
  sysreset driver patch
2019-07-21 12:45:10 +02:00
Simon Goldschmidt
d6d383ca27 arm: socfpga: provide default SPL_SIZE_LIMIT for gen5
This provides an SPL_SIZE_LIMIT that makes the build check that the SPL
binary loaded from flash fits into the SRAM (64 KiB) and leaves enough
room for global data, heap  and stack (512 bytes assumed stack usage).

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
2019-06-14 12:41:26 +02:00
Marek Vasut
476abb72e0 ARM: socfpga: Clear PL310 early in SPL
On SoCFPGA A10 systems, it can rarely happen that a reboot from Linux
will result in stale data in PL310 L2 cache controller. Even if the L2
cache controller is disabled via the CTRL register CTRL_EN bit, those
data can interfere with operation of devices using DMA, like e.g. the
DWMMC controller. This can in turn cause e.g. SPL to fail reading data
from SD/MMC.

The obvious solution here would be to fully reset the L2 cache controller
via the reset manager MPUMODRST L2 bit, however this causes bus hang even
if executed entirely from L1 I-cache to avoid generating any bus traffic
through the L2 cache controller.

This patch thus configures and enables the L2 cache controller very early
in the SPL boot process, clears the L2 cache and disables the L2 cache
controller again.

The reason for doing it in SPL is because we need to avoid accessing any
of the potentially stale data in the L2 cache, and we are certain any of
the stale data will be below the OCRAM address range. To further reduce
bus traffic during the L2 cache invalidation, we enable L1 I-cache and
run the invalidation code entirely out of the L1 I-cache.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dalon Westergreen <dwesterg@gmail.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>
2019-05-24 00:01:08 +02:00