• Rafał Miłecki's avatar
    MIPS: BCM47XX: Setup struct device for the SoC · 23b14e74
    Rafał Miłecki authored
    commit 321c46b9 upstream.
    
    So far we never had any device registered for the SoC. This resulted in
    some small issues that we kept ignoring like:
    1) Not working GPIOLIB_IRQCHIP (gpiochip_irqchip_add_key() failing)
    2) Lack of proper tree in the /sys/devices/
    3) mips_dma_alloc_coherent() silently handling empty coherent_dma_mask
    
    Kernel 4.19 came with a lot of DMA changes and caused a regression on
    bcm47xx. Starting with the commit f8c55dc6 ("MIPS: use generic dma
    noncoherent ops for simple noncoherent platforms") DMA coherent
    allocations just fail. Example:
    [    1.114914] bgmac_bcma bcma0:2: Allocation of TX ring 0x200 failed
    [    1.121215] bgmac_bcma bcma0:2: Unable to alloc memory for DMA
    [    1.127626] bgmac_bcma: probe of bcma0:2 failed with error -12
    [    1.133838] bgmac_bcma: Broadcom 47xx GBit MAC driver loaded
    
    The bgmac driver also triggers a WARNING:
    [    0.959486] ------------[ cut here ]------------
    [    0.964387] WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 bgmac_enet_probe+0x1b4/0x5c4
    [    0.973751] Modules linked in:
    [    0.976913] CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.9 #0
    [    0.982750] Stack : 804a0000 804597c4 00000000 00000000 80458fd8 8381bc2c 838282d4 80481a47
    [    0.991367]         8042e3ec 00000001 804d38f0 00000204 83980000 00000065 8381bbe0 6f55b24f
    [    0.999975]         00000000 00000000 80520000 00002018 00000000 00000075 00000007 00000000
    [    1.008583]         00000000 80480000 000ee811 00000000 00000000 00000000 80432c00 80248db8
    [    1.017196]         00000009 00000204 83980000 803ad7b0 00000000 801feeec 00000000 804d0000
    [    1.025804]         ...
    [    1.028325] Call Trace:
    [    1.030875] [<8000aef8>] show_stack+0x58/0x100
    [    1.035513] [<8001f8b4>] __warn+0xe4/0x118
    [    1.039708] [<8001f9a4>] warn_slowpath_null+0x48/0x64
    [    1.044935] [<80248db8>] bgmac_enet_probe+0x1b4/0x5c4
    [    1.050101] [<802498e0>] bgmac_probe+0x558/0x590
    [    1.054906] [<80252fd0>] bcma_device_probe+0x38/0x70
    [    1.060017] [<8020e1e8>] really_probe+0x170/0x2e8
    [    1.064891] [<8020e714>] __driver_attach+0xa4/0xec
    [    1.069784] [<8020c1e0>] bus_for_each_dev+0x58/0xb0
    [    1.074833] [<8020d590>] bus_add_driver+0xf8/0x218
    [    1.079731] [<8020ef24>] driver_register+0xcc/0x11c
    [    1.084804] [<804b54cc>] bgmac_init+0x1c/0x44
    [    1.089258] [<8000121c>] do_one_initcall+0x7c/0x1a0
    [    1.094343] [<804a1d34>] kernel_init_freeable+0x150/0x218
    [    1.099886] [<803a082c>] kernel_init+0x10/0x104
    [    1.104583] [<80005878>] ret_from_kernel_thread+0x14/0x1c
    [    1.110107] ---[ end trace f441c0d873d1fb5b ]---
    
    This patch setups a "struct device" (and passes it to the bcma) which
    allows fixing all the mentioned problems. It'll also require a tiny bcma
    patch which will follow through the wireless tree & its maintainer.
    
    Fixes: f8c55dc6 ("MIPS: use generic dma noncoherent ops for simple noncoherent platforms")
    Signed-off-by: default avatarRafał Miłecki <rafal@milecki.pl>
    Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
    Acked-by: Hauke Mehrtens's avatarHauke Mehrtens <hauke@hauke-m.de>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Linus Walleij <linus.walleij@linaro.org>
    Cc: linux-wireless@vger.kernel.org
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: James Hogan <jhogan@kernel.org>
    Cc: linux-mips@linux-mips.org
    Cc: linux-kernel@vger.kernel.org
    Cc: stable@vger.kernel.org # v4.19+
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    23b14e74
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