| Message ID | 20230818071405.28581-2-schmitzmic@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | Q40 IDE fixes | expand |
On Fri, 18 Aug 2023, Michael Schmitz wrote: > With commit 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver > with pata_falcon and falconide"), the Q40 IDE driver was > replaced by pata_falcon.c. > > Both IO and memory resources were defined for the Q40 IDE > platform device, but definition of the IDE register addresses > was modeled after the Falcon case, both in use of the memory > resources and in including register scale and byte vs. word > offset in the address. > > This was correct for the Falcon case, which does not apply > any address translation to the register addresses. In the > Q40 case, all of device base address, byte access offset > and register scaling is included in the platform specific > ISA access translation (in asm/mm_io.h). > > As a consequence, such address translation gets applied > twice, and register addresses are mangled. > > Use the device base address from the platform IO resource, > and use standard register offsets from that base in order > to calculate register addresses (the IO address translation > will then apply the correct ISA window base and scaling). > > Encode PIO_OFFSET into IO port addresses for all registers > except the data transfer register. Encode the MMIO offset > there (pata_falcon_data_xfer() directly uses raw IO with > no address translation). > > Reported-by: William R Sowerbutts <will@sowerbutts.com> > Closes: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com > Link: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com > Fixes: 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver with pata_falcon and falconide") > Cc: Finn Thain <fthain@linux-m68k.org> > Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: stable@vger.kernel.org From Documentation/process/submitting-patches.rst -- "Note: Attaching a Fixes: tag does not subvert the stable kernel rules process nor the requirement to Cc: stable@vger.kernel.org on all stable patch candidates... " > Signed-off-by: Michael Schmitz <schmitzmic@gmail.com> > > --- > > Changes from v1: > > Damien Le Moal: > - change patch title > - drop stable backport tag > > Changes from RFC v3: > > - split off byte swap option into separate patch > > Geert Uytterhoeven: > - review comments > > Changes from RFC v2: > - add driver parameter 'data_swap' as bit mask for drives to swap > > Changes from RFC v1: > > Finn Thain: > - take care to supply IO address suitable for ioread8/iowrite8 > - use MMIO address for data transfer > --- > drivers/ata/pata_falcon.c | 55 ++++++++++++++++++++++++--------------- > 1 file changed, 34 insertions(+), 21 deletions(-) > > diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c > index 996516e64f13..346259e3bbc8 100644 > --- a/drivers/ata/pata_falcon.c > +++ b/drivers/ata/pata_falcon.c > @@ -123,8 +123,8 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) > struct resource *base_res, *ctl_res, *irq_res; > struct ata_host *host; > struct ata_port *ap; > - void __iomem *base; > - int irq = 0; > + void __iomem *base, *ctl_base; > + int irq = 0, io_offset = 1, reg_scale = 4; > > dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); > > @@ -165,26 +165,39 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) > ap->pio_mask = ATA_PIO4; > ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; > > - base = (void __iomem *)base_mem_res->start; > /* N.B. this assumes data_addr will be used for word-sized I/O only */ > - ap->ioaddr.data_addr = base + 0 + 0 * 4; > - ap->ioaddr.error_addr = base + 1 + 1 * 4; > - ap->ioaddr.feature_addr = base + 1 + 1 * 4; > - ap->ioaddr.nsect_addr = base + 1 + 2 * 4; > - ap->ioaddr.lbal_addr = base + 1 + 3 * 4; > - ap->ioaddr.lbam_addr = base + 1 + 4 * 4; > - ap->ioaddr.lbah_addr = base + 1 + 5 * 4; > - ap->ioaddr.device_addr = base + 1 + 6 * 4; > - ap->ioaddr.status_addr = base + 1 + 7 * 4; > - ap->ioaddr.command_addr = base + 1 + 7 * 4; > - > - base = (void __iomem *)ctl_mem_res->start; > - ap->ioaddr.altstatus_addr = base + 1; > - ap->ioaddr.ctl_addr = base + 1; > - > - ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", > - (unsigned long)base_mem_res->start, > - (unsigned long)ctl_mem_res->start); > + ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; > + > + if (base_res) { /* only Q40 has IO resources */ > + io_offset = 0x10000; > + reg_scale = 1; > + base = (void __iomem *)base_res->start; > + ctl_base = (void __iomem *)ctl_res->start; > + > + ata_port_desc(ap, "cmd %pa ctl %pa", > + &base_res->start, > + &ctl_res->start); > + } else { > + base = (void __iomem *)base_mem_res->start; > + ctl_base = (void __iomem *)ctl_mem_res->start; > + > + ata_port_desc(ap, "cmd %pa ctl %pa", > + &base_mem_res->start, > + &ctl_mem_res->start); > + } > + > + ap->ioaddr.error_addr = base + io_offset + 1 * reg_scale; > + ap->ioaddr.feature_addr = base + io_offset + 1 * reg_scale; > + ap->ioaddr.nsect_addr = base + io_offset + 2 * reg_scale; > + ap->ioaddr.lbal_addr = base + io_offset + 3 * reg_scale; > + ap->ioaddr.lbam_addr = base + io_offset + 4 * reg_scale; > + ap->ioaddr.lbah_addr = base + io_offset + 5 * reg_scale; > + ap->ioaddr.device_addr = base + io_offset + 6 * reg_scale; > + ap->ioaddr.status_addr = base + io_offset + 7 * reg_scale; > + ap->ioaddr.command_addr = base + io_offset + 7 * reg_scale; > + > + ap->ioaddr.altstatus_addr = ctl_base + io_offset; > + ap->ioaddr.ctl_addr = ctl_base + io_offset; > > irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); > if (irq_res && irq_res->start > 0) { >
Hi Finn, Am 18.08.2023 um 19:52 schrieb Finn Thain: > > On Fri, 18 Aug 2023, Michael Schmitz wrote: > >> With commit 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver >> with pata_falcon and falconide"), the Q40 IDE driver was >> replaced by pata_falcon.c. >> >> Both IO and memory resources were defined for the Q40 IDE >> platform device, but definition of the IDE register addresses >> was modeled after the Falcon case, both in use of the memory >> resources and in including register scale and byte vs. word >> offset in the address. >> >> This was correct for the Falcon case, which does not apply >> any address translation to the register addresses. In the >> Q40 case, all of device base address, byte access offset >> and register scaling is included in the platform specific >> ISA access translation (in asm/mm_io.h). >> >> As a consequence, such address translation gets applied >> twice, and register addresses are mangled. >> >> Use the device base address from the platform IO resource, >> and use standard register offsets from that base in order >> to calculate register addresses (the IO address translation >> will then apply the correct ISA window base and scaling). >> >> Encode PIO_OFFSET into IO port addresses for all registers >> except the data transfer register. Encode the MMIO offset >> there (pata_falcon_data_xfer() directly uses raw IO with >> no address translation). >> >> Reported-by: William R Sowerbutts <will@sowerbutts.com> >> Closes: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com >> Link: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com >> Fixes: 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver with pata_falcon and falconide") >> Cc: Finn Thain <fthain@linux-m68k.org> >> Cc: Geert Uytterhoeven <geert@linux-m68k.org> > > Cc: stable@vger.kernel.org > > From Documentation/process/submitting-patches.rst -- > "Note: Attaching a Fixes: tag does not subvert the stable kernel rules > process nor the requirement to Cc: stable@vger.kernel.org on all stable > patch candidates... " OK, I'll add the Cc: back then. Thanks, Michael > >> Signed-off-by: Michael Schmitz <schmitzmic@gmail.com> >> >> --- >> >> Changes from v1: >> >> Damien Le Moal: >> - change patch title >> - drop stable backport tag >> >> Changes from RFC v3: >> >> - split off byte swap option into separate patch >> >> Geert Uytterhoeven: >> - review comments >> >> Changes from RFC v2: >> - add driver parameter 'data_swap' as bit mask for drives to swap >> >> Changes from RFC v1: >> >> Finn Thain: >> - take care to supply IO address suitable for ioread8/iowrite8 >> - use MMIO address for data transfer >> --- >> drivers/ata/pata_falcon.c | 55 ++++++++++++++++++++++++--------------- >> 1 file changed, 34 insertions(+), 21 deletions(-) >> >> diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c >> index 996516e64f13..346259e3bbc8 100644 >> --- a/drivers/ata/pata_falcon.c >> +++ b/drivers/ata/pata_falcon.c >> @@ -123,8 +123,8 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) >> struct resource *base_res, *ctl_res, *irq_res; >> struct ata_host *host; >> struct ata_port *ap; >> - void __iomem *base; >> - int irq = 0; >> + void __iomem *base, *ctl_base; >> + int irq = 0, io_offset = 1, reg_scale = 4; >> >> dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); >> >> @@ -165,26 +165,39 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) >> ap->pio_mask = ATA_PIO4; >> ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; >> >> - base = (void __iomem *)base_mem_res->start; >> /* N.B. this assumes data_addr will be used for word-sized I/O only */ >> - ap->ioaddr.data_addr = base + 0 + 0 * 4; >> - ap->ioaddr.error_addr = base + 1 + 1 * 4; >> - ap->ioaddr.feature_addr = base + 1 + 1 * 4; >> - ap->ioaddr.nsect_addr = base + 1 + 2 * 4; >> - ap->ioaddr.lbal_addr = base + 1 + 3 * 4; >> - ap->ioaddr.lbam_addr = base + 1 + 4 * 4; >> - ap->ioaddr.lbah_addr = base + 1 + 5 * 4; >> - ap->ioaddr.device_addr = base + 1 + 6 * 4; >> - ap->ioaddr.status_addr = base + 1 + 7 * 4; >> - ap->ioaddr.command_addr = base + 1 + 7 * 4; >> - >> - base = (void __iomem *)ctl_mem_res->start; >> - ap->ioaddr.altstatus_addr = base + 1; >> - ap->ioaddr.ctl_addr = base + 1; >> - >> - ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", >> - (unsigned long)base_mem_res->start, >> - (unsigned long)ctl_mem_res->start); >> + ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; >> + >> + if (base_res) { /* only Q40 has IO resources */ >> + io_offset = 0x10000; >> + reg_scale = 1; >> + base = (void __iomem *)base_res->start; >> + ctl_base = (void __iomem *)ctl_res->start; >> + >> + ata_port_desc(ap, "cmd %pa ctl %pa", >> + &base_res->start, >> + &ctl_res->start); >> + } else { >> + base = (void __iomem *)base_mem_res->start; >> + ctl_base = (void __iomem *)ctl_mem_res->start; >> + >> + ata_port_desc(ap, "cmd %pa ctl %pa", >> + &base_mem_res->start, >> + &ctl_mem_res->start); >> + } >> + >> + ap->ioaddr.error_addr = base + io_offset + 1 * reg_scale; >> + ap->ioaddr.feature_addr = base + io_offset + 1 * reg_scale; >> + ap->ioaddr.nsect_addr = base + io_offset + 2 * reg_scale; >> + ap->ioaddr.lbal_addr = base + io_offset + 3 * reg_scale; >> + ap->ioaddr.lbam_addr = base + io_offset + 4 * reg_scale; >> + ap->ioaddr.lbah_addr = base + io_offset + 5 * reg_scale; >> + ap->ioaddr.device_addr = base + io_offset + 6 * reg_scale; >> + ap->ioaddr.status_addr = base + io_offset + 7 * reg_scale; >> + ap->ioaddr.command_addr = base + io_offset + 7 * reg_scale; >> + >> + ap->ioaddr.altstatus_addr = ctl_base + io_offset; >> + ap->ioaddr.ctl_addr = ctl_base + io_offset; >> >> irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); >> if (irq_res && irq_res->start > 0) { >>
diff --git a/drivers/ata/pata_falcon.c b/drivers/ata/pata_falcon.c index 996516e64f13..346259e3bbc8 100644 --- a/drivers/ata/pata_falcon.c +++ b/drivers/ata/pata_falcon.c @@ -123,8 +123,8 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) struct resource *base_res, *ctl_res, *irq_res; struct ata_host *host; struct ata_port *ap; - void __iomem *base; - int irq = 0; + void __iomem *base, *ctl_base; + int irq = 0, io_offset = 1, reg_scale = 4; dev_info(&pdev->dev, "Atari Falcon and Q40/Q60 PATA controller\n"); @@ -165,26 +165,39 @@ static int __init pata_falcon_init_one(struct platform_device *pdev) ap->pio_mask = ATA_PIO4; ap->flags |= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY; - base = (void __iomem *)base_mem_res->start; /* N.B. this assumes data_addr will be used for word-sized I/O only */ - ap->ioaddr.data_addr = base + 0 + 0 * 4; - ap->ioaddr.error_addr = base + 1 + 1 * 4; - ap->ioaddr.feature_addr = base + 1 + 1 * 4; - ap->ioaddr.nsect_addr = base + 1 + 2 * 4; - ap->ioaddr.lbal_addr = base + 1 + 3 * 4; - ap->ioaddr.lbam_addr = base + 1 + 4 * 4; - ap->ioaddr.lbah_addr = base + 1 + 5 * 4; - ap->ioaddr.device_addr = base + 1 + 6 * 4; - ap->ioaddr.status_addr = base + 1 + 7 * 4; - ap->ioaddr.command_addr = base + 1 + 7 * 4; - - base = (void __iomem *)ctl_mem_res->start; - ap->ioaddr.altstatus_addr = base + 1; - ap->ioaddr.ctl_addr = base + 1; - - ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", - (unsigned long)base_mem_res->start, - (unsigned long)ctl_mem_res->start); + ap->ioaddr.data_addr = (void __iomem *)base_mem_res->start; + + if (base_res) { /* only Q40 has IO resources */ + io_offset = 0x10000; + reg_scale = 1; + base = (void __iomem *)base_res->start; + ctl_base = (void __iomem *)ctl_res->start; + + ata_port_desc(ap, "cmd %pa ctl %pa", + &base_res->start, + &ctl_res->start); + } else { + base = (void __iomem *)base_mem_res->start; + ctl_base = (void __iomem *)ctl_mem_res->start; + + ata_port_desc(ap, "cmd %pa ctl %pa", + &base_mem_res->start, + &ctl_mem_res->start); + } + + ap->ioaddr.error_addr = base + io_offset + 1 * reg_scale; + ap->ioaddr.feature_addr = base + io_offset + 1 * reg_scale; + ap->ioaddr.nsect_addr = base + io_offset + 2 * reg_scale; + ap->ioaddr.lbal_addr = base + io_offset + 3 * reg_scale; + ap->ioaddr.lbam_addr = base + io_offset + 4 * reg_scale; + ap->ioaddr.lbah_addr = base + io_offset + 5 * reg_scale; + ap->ioaddr.device_addr = base + io_offset + 6 * reg_scale; + ap->ioaddr.status_addr = base + io_offset + 7 * reg_scale; + ap->ioaddr.command_addr = base + io_offset + 7 * reg_scale; + + ap->ioaddr.altstatus_addr = ctl_base + io_offset; + ap->ioaddr.ctl_addr = ctl_base + io_offset; irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (irq_res && irq_res->start > 0) {
With commit 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver with pata_falcon and falconide"), the Q40 IDE driver was replaced by pata_falcon.c. Both IO and memory resources were defined for the Q40 IDE platform device, but definition of the IDE register addresses was modeled after the Falcon case, both in use of the memory resources and in including register scale and byte vs. word offset in the address. This was correct for the Falcon case, which does not apply any address translation to the register addresses. In the Q40 case, all of device base address, byte access offset and register scaling is included in the platform specific ISA access translation (in asm/mm_io.h). As a consequence, such address translation gets applied twice, and register addresses are mangled. Use the device base address from the platform IO resource, and use standard register offsets from that base in order to calculate register addresses (the IO address translation will then apply the correct ISA window base and scaling). Encode PIO_OFFSET into IO port addresses for all registers except the data transfer register. Encode the MMIO offset there (pata_falcon_data_xfer() directly uses raw IO with no address translation). Reported-by: William R Sowerbutts <will@sowerbutts.com> Closes: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com Link: https://lore.kernel.org/r/CAMuHMdUU62jjunJh9cqSqHT87B0H0A4udOOPs=WN7WZKpcagVA@mail.gmail.com Fixes: 44b1fbc0f5f3 ("m68k/q40: Replace q40ide driver with pata_falcon and falconide") Cc: Finn Thain <fthain@linux-m68k.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Michael Schmitz <schmitzmic@gmail.com> --- Changes from v1: Damien Le Moal: - change patch title - drop stable backport tag Changes from RFC v3: - split off byte swap option into separate patch Geert Uytterhoeven: - review comments Changes from RFC v2: - add driver parameter 'data_swap' as bit mask for drives to swap Changes from RFC v1: Finn Thain: - take care to supply IO address suitable for ioread8/iowrite8 - use MMIO address for data transfer --- drivers/ata/pata_falcon.c | 55 ++++++++++++++++++++++++--------------- 1 file changed, 34 insertions(+), 21 deletions(-)