ARM: OMAP2: gpmc-onenand: fix sync mode setup with DT

With DT-based boot, the GPMC OneNAND sync mode setup does not work
correctly. During the async mode setup, sync flags gets incorrectly
set in the onenand_async data and the system crashes during the async
setup. Also, the sync mode never gets set in gpmc_onenand_data->flags, so
even without the crash, the actual sync mode setup would never be called.

The patch fixes this by adjusting the gpmc_onenand_data->flags when the
data is read from the DT. Also while doing this we force the onenand_async
to be always async.

The patch enables to use the following DTS chunk (that should correspond
the arch/arm/mach-omap2/board-rm680.c board file setup) with Nokia N950,
which currently crashes with 3.12-rc1. The crash output can be also
found below.

&gpmc {
	ranges = <0 0 0x04000000 0x20000000>;

	onenand@0,0 {
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0 0 0x20000000>;

		gpmc,sync-read;
		gpmc,sync-write;
		gpmc,burst-length = <16>;
		gpmc,burst-read;
		gpmc,burst-wrap;
		gpmc,burst-write;
		gpmc,device-width = <2>;
		gpmc,mux-add-data = <2>;
		gpmc,cs-on-ns = <0>;
		gpmc,cs-rd-off-ns = <87>;
		gpmc,cs-wr-off-ns = <87>;
		gpmc,adv-on-ns = <0>;
		gpmc,adv-rd-off-ns = <10>;
		gpmc,adv-wr-off-ns = <10>;
		gpmc,oe-on-ns = <15>;
		gpmc,oe-off-ns = <87>;
		gpmc,we-on-ns = <0>;
		gpmc,we-off-ns = <87>;
		gpmc,rd-cycle-ns = <112>;
		gpmc,wr-cycle-ns = <112>;
		gpmc,access-ns = <81>;
		gpmc,page-burst-access-ns = <15>;
		gpmc,bus-turnaround-ns = <0>;
		gpmc,cycle2cycle-delay-ns = <0>;
		gpmc,wait-monitoring-ns = <0>;
		gpmc,clk-activation-ns = <5>;
		gpmc,wr-data-mux-bus-ns = <30>;
		gpmc,wr-access-ns = <81>;
		gpmc,sync-clk-ps = <15000>;
	};
};

[    1.467559] GPMC CS0: cs_on     :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.474822] GPMC CS0: cs_rd_off :   1 ticks,   5 ns (was  24 ticks)   5 ns
[    1.482116] GPMC CS0: cs_wr_off :  14 ticks,  71 ns (was  24 ticks)  71 ns
[    1.489349] GPMC CS0: adv_on    :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.496582] GPMC CS0: adv_rd_off:   3 ticks,  15 ns (was   3 ticks)  15 ns
[    1.503845] GPMC CS0: adv_wr_off:   3 ticks,  15 ns (was   3 ticks)  15 ns
[    1.511077] GPMC CS0: oe_on     :   3 ticks,  15 ns (was   4 ticks)  15 ns
[    1.518310] GPMC CS0: oe_off    :   1 ticks,   5 ns (was  24 ticks)   5 ns
[    1.525543] GPMC CS0: we_on     :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.532806] GPMC CS0: we_off    :   8 ticks,  40 ns (was  24 ticks)  40 ns
[    1.540039] GPMC CS0: rd_cycle  :   4 ticks,  20 ns (was  29 ticks)  20 ns
[    1.547302] GPMC CS0: wr_cycle  :   4 ticks,  20 ns (was  29 ticks)  20 ns
[    1.554504] GPMC CS0: access    :   0 ticks,   0 ns (was  23 ticks)   0 ns
[    1.561767] GPMC CS0: page_burst_access:   0 ticks,   0 ns (was   3 ticks)   0 ns
[    1.569641] GPMC CS0: bus_turnaround:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.577270] GPMC CS0: cycle2cycle_delay:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.585144] GPMC CS0: wait_monitoring:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.592834] GPMC CS0: clk_activation:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.600463] GPMC CS0: wr_data_mux_bus:   5 ticks,  25 ns (was   8 ticks)  25 ns
[    1.608154] GPMC CS0: wr_access :   0 ticks,   0 ns (was  23 ticks)   0 ns
[    1.615386] GPMC CS0 CLK period is 5 ns (div 1)
[    1.625122] Unhandled fault: external abort on non-linefetch (0x1008) at 0xf009e442
[    1.633178] Internal error: : 1008 [#1] ARM
[    1.637573] Modules linked in:
[    1.640777] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-rc1-n9xx-los.git-5318619-00006-g4baa700-dirty #26
[    1.651123] task: ef04c000 ti: ef050000 task.ti: ef050000
[    1.656799] PC is at gpmc_onenand_setup+0x98/0x1e0
[    1.661865] LR is at gpmc_cs_set_timings+0x494/0x5a4
[    1.667083] pc : [<c002e040>]    lr : [<c001f384>]    psr: 60000113
[    1.667083] sp : ef051d10  ip : ef051ce0  fp : ef051d94
[    1.679138] r10: c0caaf60  r9 : ef050000  r8 : ef18b32c
[    1.684631] r7 : f0080000  r6 : c0caaf60  r5 : 00000000  r4 : f009e400
[    1.691497] r3 : f009e442  r2 : 80050000  r1 : 00000014  r0 : 00000000
[    1.698333] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[    1.706024] Control: 10c5387d  Table: af290019  DAC: 00000015
[    1.712066] Process swapper (pid: 1, stack limit = 0xef050240)
[    1.718200] Stack: (0xef051d10 to 0xef052000)
[    1.722778] 1d00:                                     00004000 00001402 00000000 00000005
[    1.731384] 1d20: 00000047 00000000 0000000f 0000000f 00000000 00000028 0000000f 00000005
[    1.739990] 1d40: 00000000 00000000 00000014 00000014 00000000 00000000 00000000 00000000
[    1.748596] 1d60: 00000000 00000019 00000000 00000000 ef18b000 ef099c50 c0c8cb30 00000000
[    1.757171] 1d80: c0488074 c048f868 ef051dcc ef051d98 c024447c c002dfb4 00000000 c048f868
[    1.765777] 1da0: 00000000 00000000 c010e4a4 c0dbbb7c c0c8cb40 00000000 c0ca2500 c0488074
[    1.774383] 1dc0: ef051ddc ef051dd0 c01fd508 c0244370 ef051dfc ef051de0 c01fc204 c01fd4f4
[    1.782989] 1de0: c0c8cb40 c0ca2500 c0c8cb74 00000000 ef051e1c ef051e00 c01fc3b0 c01fc104
[    1.791595] 1e00: ef0983bc 00000000 c0ca2500 c01fc31c ef051e44 ef051e20 c01fa794 c01fc328
[    1.800201] 1e20: ef03634c ef0983b0 ef27d534 c0ca2500 ef27d500 c0c9a2f8 ef051e54 ef051e48
[    1.808807] 1e40: c01fbcfc c01fa744 ef051e84 ef051e58 c01fb838 c01fbce4 c0411df8 c0caa040
[    1.817413] 1e60: ef051e84 c0ca2500 00000006 c0caa040 00000066 c0488074 ef051e9c ef051e88
[    1.825988] 1e80: c01fca30 c01fb768 c04975b8 00000006 ef051eac ef051ea0 c01fd728 c01fc9bc
[    1.834594] 1ea0: ef051ebc ef051eb0 c048808c c01fd6e4 ef051f4c ef051ec0 c0008888 c0488080
[    1.843200] 1ec0: 0000006f c046bae8 00000000 00000000 ef051efc ef051ee0 ef051f04 ef051ee8
[    1.851806] 1ee0: c046d400 c0181218 c046d410 c18da8d5 c036a8e4 00000066 ef051f4c ef051f08
[    1.860412] 1f00: c004b9a8 c046d41c c048f840 00000006 00000006 c046b488 00000000 c043ec08
[    1.869018] 1f20: ef051f4c c04975b8 00000006 c0caa040 00000066 c046d410 c048f85c c048f868
[    1.877593] 1f40: ef051f94 ef051f50 c046db8c c00087a0 00000006 00000006 c046d410 ffffffff
[    1.886199] 1f60: ffffffff ffffffff ffffffff 00000000 c0348fd0 00000000 00000000 00000000
[    1.894805] 1f80: 00000000 00000000 ef051fac ef051f98 c0348fe0 c046daa8 00000000 00000000
[    1.903411] 1fa0: 00000000 ef051fb0 c000e7f8 c0348fdc 00000000 00000000 00000000 00000000
[    1.912017] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    1.920623] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
[    1.929199] Backtrace:
[    1.931793] [<c002dfa8>] (gpmc_onenand_setup+0x0/0x1e0) from [<c024447c>] (omap2_onenand_probe+0x118/0x49c)
[    1.942047] [<c0244364>] (omap2_onenand_probe+0x0/0x49c) from [<c01fd508>] (platform_drv_probe+0x20/0x24)
[    1.952117]  r8:c0488074 r7:c0ca2500 r6:00000000 r5:c0c8cb40 r4:c0dbbb7c
[    1.959197] [<c01fd4e8>] (platform_drv_probe+0x0/0x24) from [<c01fc204>] (driver_probe_device+0x10c/0x224)
[    1.969360] [<c01fc0f8>] (driver_probe_device+0x0/0x224) from [<c01fc3b0>] (__driver_attach+0x94/0x98)
[    1.979125]  r7:00000000 r6:c0c8cb74 r5:c0ca2500 r4:c0c8cb40
[    1.985107] [<c01fc31c>] (__driver_attach+0x0/0x98) from [<c01fa794>] (bus_for_each_dev+0x5c/0x90)
[    1.994506]  r6:c01fc31c r5:c0ca2500 r4:00000000 r3:ef0983bc
[    2.000488] [<c01fa738>] (bus_for_each_dev+0x0/0x90) from [<c01fbcfc>] (driver_attach+0x24/0x28)
[    2.009735]  r6:c0c9a2f8 r5:ef27d500 r4:c0ca2500
[    2.014587] [<c01fbcd8>] (driver_attach+0x0/0x28) from [<c01fb838>] (bus_add_driver+0xdc/0x260)
[    2.023742] [<c01fb75c>] (bus_add_driver+0x0/0x260) from [<c01fca30>] (driver_register+0x80/0xfc)
[    2.033081]  r8:c0488074 r7:00000066 r6:c0caa040 r5:00000006 r4:c0ca2500
[    2.040161] [<c01fc9b0>] (driver_register+0x0/0xfc) from [<c01fd728>] (__platform_driver_register+0x50/0x64)
[    2.050476]  r5:00000006 r4:c04975b8
[    2.054260] [<c01fd6d8>] (__platform_driver_register+0x0/0x64) from [<c048808c>] (omap2_onenand_driver_init+0x18/0x20)
[    2.065490] [<c0488074>] (omap2_onenand_driver_init+0x0/0x20) from [<c0008888>] (do_one_initcall+0xf4/0x150)
[    2.075836] [<c0008794>] (do_one_initcall+0x0/0x150) from [<c046db8c>] (kernel_init_freeable+0xf0/0x1b4)
[    2.085815] [<c046da9c>] (kernel_init_freeable+0x0/0x1b4) from [<c0348fe0>] (kernel_init+0x10/0xec)
[    2.095336] [<c0348fd0>] (kernel_init+0x0/0xec) from [<c000e7f8>] (ret_from_fork+0x14/0x3c)
[    2.104125]  r4:00000000 r3:00000000
[    2.107879] Code: ebffc3ae e2505000 ba00002e e2843042 (e1d320b0)
[    2.114318] ---[ end trace b8ee3e3e5e002451 ]---

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/arm/mach-omap2/gpmc-onenand.c b/arch/arm/mach-omap2/gpmc-onenand.c
index 64b5a8346982..8b6876c98ce1 100644
--- a/arch/arm/mach-omap2/gpmc-onenand.c
+++ b/arch/arm/mach-omap2/gpmc-onenand.c
@@ -272,9 +272,19 @@ static int omap2_onenand_setup_async(void __iomem *onenand_base)
 	struct gpmc_timings t;
 	int ret;
 
-	if (gpmc_onenand_data->of_node)
+	if (gpmc_onenand_data->of_node) {
 		gpmc_read_settings_dt(gpmc_onenand_data->of_node,
 				      &onenand_async);
+		if (onenand_async.sync_read || onenand_async.sync_write) {
+			if (onenand_async.sync_write)
+				gpmc_onenand_data->flags |=
+					ONENAND_SYNC_READWRITE;
+			else
+				gpmc_onenand_data->flags |= ONENAND_SYNC_READ;
+			onenand_async.sync_read = false;
+			onenand_async.sync_write = false;
+		}
+	}
 
 	omap2_onenand_set_async_mode(onenand_base);