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Message-ID: <4B26B0D6.4080809@bluewatersys.com> Date: Tue, 15 Dec 2009 10:40:38 +1300 From: Ryan Mallon <ryan@...ewatersys.com> To: Bartlomiej Zolnierkiewicz <bzolnier@...il.com> CC: linux-ide@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Sergei Shtylyov <sshtylyov@...montavista.com>, Joao Ramos <joao.ramos@...v.pt>, H Hartley Sweeten <hsweeten@...ionengravers.com> Subject: Re: [PATCH] add PATA host controller support for Cirrus Logic's EP93xx CPUs Bartlomiej Zolnierkiewicz wrote: > On Wednesday 02 December 2009 01:53:53 am Ryan Mallon wrote: > >> Bartlomiej Zolnierkiewicz wrote: >> >>> Based on the older IDE host driver by Joao Ramos and review comments >>> for it from Sergei Shtylyov. Not yet tested with the real hardware. >>> >>> >> Hi Bartlomiej, >> >> I have got as far as patching this into my kernel and doing a build test >> (still need to find a hard-disk to test). I got some build errors, see >> below: >> > > Hi, > > Many thanks for picking this driver up. > Okay, it now patches in cleanly. However, I get the following crash on boot: ep93xx-ide ep93xx-ide: EP93xx PATA host controller driver initialized ep93xx-ide: __pata_ep93xx_write - base = ce070000, value = a, addr = 1, t = 0 Unable to handle kernel NULL pointer dereference at virtual address 00000002 pgd = c0004000 [00000002] *pgd=00000000 Internal error: Oops: 5 [#1] last sysfs file: Modules linked in: CPU: 0 Not tainted (2.6.32-06794-g17ded11-dirty #544) PC is at __pata_ep93xx_write+0x38/0xc4 LR is at __pata_ep93xx_write+0x34/0xc4 pc : [<c0189dac>] lr : [<c0189da8>] psr: 60000093 sp : cd017e70 ip : 00000c3b fp : 00000000 r10: cd12a754 r9 : c0351140 r8 : 00000000 r7 : 00000000 r6 : ce070000 r5 : 0000000a r4 : 00000061 r3 : ce070000 r2 : cd017e64 r1 : c0301bda r0 : 00000054 Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel Control: c000717f Table: c0004000 DAC: 00000017 Process swapper (pid: 1, stack limit = 0xcd016270) Stack: (0xcd017e70 to 0xcd018000) 7e60: 00000001 00000000 00000001 cd124000 7e80: cd124000 00000000 00000000 c018a148 cd124000 c018180c a0000013 c0181918 7ea0: cd12a750 cd124000 00000000 c01772fc cd12a750 00000028 c0187e6c c0351140 7ec0: c0344220 cd12a750 00000028 c0187e6c 00000000 c0177edc cd12a750 00000028 7ee0: c0187e6c 00000000 c0351140 c0344220 c0344218 ce070000 cd12a750 00000028 7f00: c0344e68 c0014508 c0351140 00000000 c0344220 c0344220 c0351024 cd12a7a0 7f20: c0350428 00000000 00000000 c0164904 c0344220 c0163a78 c0344220 c0344254 7f40: c0351024 cd12a7a0 c0350428 c0163b88 00000000 c0163b2c c0351024 c0163330 7f60: cd0084a8 cd00fb40 c001b3dc c0351024 c0351024 c0162c48 c02e4755 c02e4755 7f80: ffffffff c001b3dc c0351010 c0351024 c0014354 00000000 00000000 c0163e54 7fa0: c001b3dc c0351010 00000000 c0014354 00000000 c0164bec c001b3dc 00000000 7fc0: 00000000 c002038c c0014354 00000000 c035d740 c001b494 c001b3dc 00000000 7fe0: 00000000 00000000 00000000 c0008578 00000000 c0021ea0 c504c134 c504c136 [<c0189dac>] (__pata_ep93xx_write+0x38/0xc4) from [<c018a148>] (pata_ep93xx_freeze+0x40/0x6c) [<c018a148>] (pata_ep93xx_freeze+0x40/0x6c) from [<c018180c>] (__ata_port_freeze+0x38/0x50) [<c018180c>] (__ata_port_freeze+0x38/0x50) from [<c0181918>] (ata_eh_freeze_port+0x2c/0x3c) [<c0181918>] (ata_eh_freeze_port+0x2c/0x3c) from [<c01772fc>] (ata_host_start+0x12c/0x1a4) [<c01772fc>] (ata_host_start+0x12c/0x1a4) from [<c0177edc>] (ata_host_activate+0x1c/0xe8) [<c0177edc>] (ata_host_activate+0x1c/0xe8) from [<c0014508>] (pata_ep93xx_probe+0x1a0/0x1c8) [<c0014508>] (pata_ep93xx_probe+0x1a0/0x1c8) from [<c0164904>] (platform_drv_probe+0x18/0x1c) [<c0164904>] (platform_drv_probe+0x18/0x1c) from [<c0163a78>] (driver_probe_device+0xa8/0x15c) [<c0163a78>] (driver_probe_device+0xa8/0x15c) from [<c0163b88>] (__driver_attach+0x5c/0x7c) [<c0163b88>] (__driver_attach+0x5c/0x7c) from [<c0163330>] (bus_for_each_dev+0x48/0x78) [<c0163330>] (bus_for_each_dev+0x48/0x78) from [<c0162c48>] (bus_add_driver+0x9c/0x220) [<c0162c48>] (bus_add_driver+0x9c/0x220) from [<c0163e54>] (driver_register+0xa4/0x130) [<c0163e54>] (driver_register+0xa4/0x130) from [<c0164bec>] (platform_driver_probe+0x18/0x8c) [<c0164bec>] (platform_driver_probe+0x18/0x8c) from [<c002038c>] (do_one_initcall+0x5c/0x1b4) [<c002038c>] (do_one_initcall+0x5c/0x1b4) from [<c0008578>] (kernel_init+0x94/0x10c) [<c0008578>] (kernel_init+0x94/0x10c) from [<c0021ea0>] (kernel_thread_exit+0x0/0x8) Code: e58dc000 e58d7004 eb03cb2e e5864000 (e1d700b2) ---[ end trace ed0490e29e490c57 ]--- I have added some of my own debugging. The problem appears to be that __pata_ep93xx_write gets called from probe (via ata_host_activate), but ap->private_data (ata_timing) is still null. The timing private_data is set by pata_ep93xx_set_piomode, but that needs adev->pio_mode set, but I don't know where this happens. I assume the ATA core handles this. Do I need to call pata_ep93xx_set_piomode from pata_ep93xx_probe before ata_host_activate, or should the private_data timing be set to some default in the probe? Thanks, ~Ryan -- Bluewater Systems Ltd - ARM Technology Solution Centre Ryan Mallon 5 Amuri Park, 404 Barbadoes St ryan@...ewatersys.com PO Box 13 889, Christchurch 8013 http://www.bluewatersys.com New Zealand Phone: +64 3 3779127 Freecall: Australia 1800 148 751 Fax: +64 3 3779135 USA 1800 261 2934 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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