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de2d9b5284
GPC registers are NOT continuous, some registers are
reserved and accessing them from userspace will trigger
external abort, add regmap register access table to
avoid below abort:
root@imx6slevk:~# cat /sys/kernel/debug/regmap/20dc000.gpc/registers
[ 108.480477] Unhandled fault: imprecise external abort (0x1406) at 0xb6db5004
[ 108.487985] pgd = 42b54bfd
[ 108.490741] [b6db5004] *pgd=ba1b7831
[ 108.494386] Internal error: : 1406 [#1] SMP ARM
[ 108.498943] Modules linked in:
[ 108.502043] CPU: 0 PID: 389 Comm: cat Not tainted 4.18.0-rc1-00074-gc9f1f60-dirty #482
[ 108.509982] Hardware name: Freescale i.MX6 SoloLite (Device Tree)
[ 108.516123] PC is at regmap_mmio_read32le+0x20/0x24
[ 108.521031] LR is at regmap_mmio_read+0x40/0x60
[ 108.525586] pc : [<c059cf74>] lr : [<c059d1ac>] psr: 20060093
[ 108.531875] sp : eccf1d98 ip : eccf1da8 fp : eccf1da4
[ 108.537122] r10: ec2d3800 r9 : eccf1f60 r8 : ecfc0000
[ 108.542370] r7 : eccf1e2c r6 : eccf1e2c r5 : 00000028 r4 : ec338e00
[ 108.548920] r3 : 00000000 r2 : eccf1e2c r1 : f0980028 r0 : 00000000
[ 108.555474] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
[ 108.562720] Control: 10c5387d Table: acf4004a DAC: 00000051
[ 108.568491] Process cat (pid: 389, stack limit = 0xd4318a65)
[ 108.574174] Stack: (0xeccf1d98 to 0xeccf2000)
Fixes: 721cabf6c6 ("soc: imx: move PGC handling to a new GPC driver")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.