Re: [git patches] libata updates

Jung-Ik (John) Lee
2009-09-22T02:36:37Z

On Sun, Sep 20, 2009 at 2:05 PM, Bartlomiej Zolnierkiewicz
<bzolnier@gmail.com> wrote:
> On Thursday 17 September 2009 22:49:35 Jeff Garzik wrote:
>>
>> Bug fixes, and a new driver.
>>
>>
>>
>> Please pull from 'upstream-linus' branch of
>> master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev.git upstream-linus
>>
>> to receive the following updates:
>>
>>  drivers/ata/Kconfig        |    9 +
>>  drivers/ata/Makefile       |    1 +
>>  drivers/ata/ahci.c         |    4 +-
>>  drivers/ata/libata-core.c  |    4 +-
>>  drivers/ata/pata_amd.c     |    3 +
>>  drivers/ata/pata_atp867x.c |  548 ++++++++++++++++++++++++++++++++++++++++++++
>>  drivers/ata/sata_promise.c |  155 +++++++++++--
>>  include/linux/pci_ids.h    |    2 +
>>  8 files changed, 704 insertions(+), 22 deletions(-)
>>  create mode 100644 drivers/ata/pata_atp867x.c
>>
>> John(Jung-Ik) Lee (1):
>>       libata: Add pata_atp867x driver for Artop/Acard ATP867X controllers
>
> That was really fast..  Not necessarily a bad thing but this driver would
> benefit from few polishing touches..
>
>> diff --git a/drivers/ata/pata_atp867x.c b/drivers/ata/pata_atp867x.c
>> new file mode 100644
>> index 0000000..7990de9
>> --- /dev/null
>> +++ b/drivers/ata/pata_atp867x.c
>> @@ -0,0 +1,548 @@
>> +/*
>> + * pata_atp867x.c - ARTOP 867X 64bit 4-channel UDMA133 ATA controller driver
>> + *
>> + *   (C) 2009 Google Inc. John(Jung-Ik) Lee <jilee@google.com>
>> + *
>> + * Per Atp867 data sheet rev 1.2, Acard.
>> + * Based in part on early ide code from
>> + *   2003-2004 by Eric Uhrhane, Google, Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + * You should have received a copy of the GNU General Public License
>> + * along with this program; if not, write to the Free Software
>> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
>> + *
>> + *
>> + * TODO:
>> + *   1. RAID features [comparison, XOR, striping, mirroring, etc.]
>> + */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/pci.h>
>> +#include <linux/init.h>
>> +#include <linux/blkdev.h>
>> +#include <linux/delay.h>
>> +#include <linux/device.h>
>> +#include <scsi/scsi_host.h>
>> +#include <linux/libata.h>
>> +
>> +#define      DRV_NAME        "pata_atp867x"
>> +#define      DRV_VERSION     "0.7.5"
>> +
>> +/*
>> + * IO Registers
>> + * Note that all runtime hot priv ports are cached in ap private_data
>> + */
>> +
>> +enum {
>> +     ATP867X_IO_CHANNEL_OFFSET       = 0x10,
>> +
>> +     /*
>> +      * IO Register Bitfields
>> +      */
>> +
>> +     ATP867X_IO_PIOSPD_ACTIVE_SHIFT  = 4,
>> +     ATP867X_IO_PIOSPD_RECOVER_SHIFT = 0,
>> +
>> +     ATP867X_IO_DMAMODE_MSTR_SHIFT   = 0,
>> +     ATP867X_IO_DMAMODE_MSTR_MASK    = 0x07,
>> +     ATP867X_IO_DMAMODE_SLAVE_SHIFT  = 4,
>> +     ATP867X_IO_DMAMODE_SLAVE_MASK   = 0x70,
>> +
>> +     ATP867X_IO_DMAMODE_UDMA_6       = 0x07,
>> +     ATP867X_IO_DMAMODE_UDMA_5       = 0x06,
>> +     ATP867X_IO_DMAMODE_UDMA_4       = 0x05,
>> +     ATP867X_IO_DMAMODE_UDMA_3       = 0x04,
>> +     ATP867X_IO_DMAMODE_UDMA_2       = 0x03,
>> +     ATP867X_IO_DMAMODE_UDMA_1       = 0x02,
>> +     ATP867X_IO_DMAMODE_UDMA_0       = 0x01,
>> +     ATP867X_IO_DMAMODE_DISABLE      = 0x00,
>> +
>> +     ATP867X_IO_SYS_INFO_66MHZ       = 0x04,
>> +     ATP867X_IO_SYS_INFO_SLOW_UDMA5  = 0x02,
>> +     ATP867X_IO_SYS_MASK_RESERVED    = (~0xf1),
>> +
>> +     ATP867X_IO_PORTSPD_VAL          = 0x1143,
>> +     ATP867X_PREREAD_VAL             = 0x0200,
>> +
>> +     ATP867X_NUM_PORTS               = 4,
>> +     ATP867X_BAR_IOBASE              = 0,
>> +     ATP867X_BAR_ROMBASE             = 6,
>> +};
>> +
>> +#define ATP867X_IOBASE(ap)           ((ap)->host->iomap[0])
>> +#define ATP867X_SYS_INFO(ap)         (0x3F + ATP867X_IOBASE(ap))
>> +
>> +#define ATP867X_IO_PORTBASE(ap, port)        (0x00 + ATP867X_IOBASE(ap) + \
>> +                                     (port) * ATP867X_IO_CHANNEL_OFFSET)
>> +#define ATP867X_IO_DMABASE(ap, port) (0x40 + \
>> +                                     ATP867X_IO_PORTBASE((ap), (port)))
>> +
>> +#define ATP867X_IO_STATUS(ap, port)  (0x07 + \
>> +                                     ATP867X_IO_PORTBASE((ap), (port)))
>> +#define ATP867X_IO_ALTSTATUS(ap, port)       (0x0E + \
>> +                                     ATP867X_IO_PORTBASE((ap), (port)))
>> +
>> +/*
>> + * hot priv ports
>> + */
>> +#define ATP867X_IO_MSTRPIOSPD(ap, port)      (0x08 + \
>> +                                     ATP867X_IO_DMABASE((ap), (port)))
>> +#define ATP867X_IO_SLAVPIOSPD(ap, port)      (0x09 + \
>> +                                     ATP867X_IO_DMABASE((ap), (port)))
>> +#define ATP867X_IO_8BPIOSPD(ap, port)        (0x0A + \
>> +                                     ATP867X_IO_DMABASE((ap), (port)))
>> +#define ATP867X_IO_DMAMODE(ap, port) (0x0B + \
>> +                                     ATP867X_IO_DMABASE((ap), (port)))
>> +
>> +#define ATP867X_IO_PORTSPD(ap, port) (0x4A + \
>> +                                     ATP867X_IO_PORTBASE((ap), (port)))
>> +#define ATP867X_IO_PREREAD(ap, port) (0x4C + \
>> +                                     ATP867X_IO_PORTBASE((ap), (port)))
>> +
>> +struct atp867x_priv {
>> +     void __iomem *dma_mode;
>> +     void __iomem *mstr_piospd;
>> +     void __iomem *slave_piospd;
>> +     void __iomem *eightb_piospd;
>> +     int             pci66mhz;
>> +};
>> +
>> +static inline u8 atp867x_speed_to_mode(u8 speed)
>> +{
>> +     return speed - XFER_UDMA_0 + 1;
>> +}
>> +
>> +static void atp867x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
>> +{
>> +     struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
>> +     struct atp867x_priv *dp = ap->private_data;
>> +     u8 speed = adev->dma_mode;
>> +     u8 b;
>> +     u8 mode;
>> +
>> +     mode = atp867x_speed_to_mode(speed);
>
> The driver currently doesn't support MWDMA modes but claims otherwise
> (fixed in the attached patch).
>
>> +     /*
>> +      * Doc 6.6.9: decrease the udma mode value by 1 for safer UDMA speed
>> +      * on 66MHz bus
>> +      *   rev-A: UDMA_1~4 (5, 6 no change)
>> +      *   rev-B: all UDMA modes
>> +      *   UDMA_0 stays not to disable UDMA
>> +      */
>> +     if (dp->pci66mhz && mode > ATP867X_IO_DMAMODE_UDMA_0  &&
>> +        (pdev->device == PCI_DEVICE_ID_ARTOP_ATP867B ||
>> +         mode < ATP867X_IO_DMAMODE_UDMA_5))
>> +             mode--;
>> +
>> +     b = ioread8(dp->dma_mode);
>> +     if (adev->devno & 1) {
>> +             b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK) |
>> +                     (mode << ATP867X_IO_DMAMODE_SLAVE_SHIFT);
>> +     } else {
>> +             b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK) |
>> +                     (mode << ATP867X_IO_DMAMODE_MSTR_SHIFT);
>> +     }
>> +     iowrite8(b, dp->dma_mode);
>> +}
>> +
>> +static int atp867x_get_active_clocks_shifted(unsigned int clk)
>> +{
>> +     unsigned char clocks = clk;
>> +
>> +     switch (clocks) {
>> +     case 0:
>> +             clocks = 1;
>> +             break;
>> +     case 1 ... 7:
>> +             break;
>> +     case 8 ... 12:
>> +             clocks = 7;
>
> Shouldn't "clocks = 0" (the default case) be used here?

The clocks value 0 sets it to 8 clocks, while value 7 sets to 12 clocks.
I cleaned up a bit on clocks_shift. See the patch below.

>
> Otherwise it seems to result in underclocked timings for dp->pci66mhz == 0.
>
>> +             break;
>> +     default:
>> +             printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
>> +                     "Using default 8clk.\n", clk);
>> +             clocks = 0;     /* 8 clk */
>> +             break;
>> +     }
>> +     return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
>> +}
>> +
>> +static int atp867x_get_recover_clocks_shifted(unsigned int clk)
>> +{
>> +     unsigned char clocks = clk;
>> +
>> +     switch (clocks) {
>> +     case 0:
>> +             clocks = 1;
>> +             break;
>> +     case 1 ... 11:
>> +             break;
>> +     case 12:
>> +             clocks = 0;
>> +             break;
>> +     case 13: case 14:
>> +             --clocks;
>> +             break;
>
> Is "clocks == 14" a reserved setting?

12 is reserved for the default (== 0), and 13, 14 are set to value 12,
13 respectively.

>
> If so a comment documenting it would be appreciated.

Sure. see the new patch below.

>
>> +     case 15:
>> +             break;
>> +     default:
>> +             printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
>> +                     "Using default 15clk.\n", clk);
>> +             clocks = 0;     /* 12 clk */
>
> Shouldn't it use "clocks == 15" setting?
It was a typo. 12 is the right default.

>
>> +             break;
>> +     }
>> +     return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
>> +}
>> +
>> +static void atp867x_set_piomode(struct ata_port *ap, struct ata_device *adev)
>> +{
>> +     struct ata_device *peer = ata_dev_pair(adev);
>> +     struct atp867x_priv *dp = ap->private_data;
>> +     u8 speed = adev->pio_mode;
>> +     struct ata_timing t, p;
>> +     int T, UT;
>> +     u8 b;
>> +
>> +     T = 1000000000 / 33333;
>> +     UT = T / 4;
>> +
>> +     ata_timing_compute(adev, speed, &t, T, UT);
>> +     if (peer && peer->pio_mode) {
>> +             ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
>> +             ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
>> +     }
>> +
>> +     b = ioread8(dp->dma_mode);
>> +     if (adev->devno & 1)
>> +             b = (b & ~ATP867X_IO_DMAMODE_SLAVE_MASK);
>> +     else
>> +             b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
>> +     iowrite8(b, dp->dma_mode);
>> +
>> +     b = atp867x_get_active_clocks_shifted(t.active) |
>> +             atp867x_get_recover_clocks_shifted(t.recover);
>> +     if (dp->pci66mhz)
>> +             b += 0x10;
>
> What is the purpose of the above hack?

For safe PIO mode according to spec.

>
> AFAICS (I don't have a datasheet) it may result in invalid active
> clocks being used for t.active > 12 and 0x80 bit being set incorrectly
> for t.active values 7..12 (unless it was the purpose of the hack).

See the patch below..

>
>> +     if (adev->devno & 1)
>> +             iowrite8(b, dp->slave_piospd);
>> +     else
>> +             iowrite8(b, dp->mstr_piospd);
>> +
>> +     /*
>> +      * use the same value for comand timing as for PIO timimg
>> +      */
>> +     iowrite8(b, dp->eightb_piospd);
>
> This is incorrect if slave/master devices use different PIO modes
> or if PIO mode <= 2 is used by any device.
>
> Timing based on t.act8b and t.rec8b values should be used instead.

act8b and rec8b have the same values as active, recovery of the port.
If a:r=3:1 then they become 4:1 on 66mhz for safer transfer, and
a8:r8=3:1, which is identical but the a8 should be incremented by 1.
I can use a8:r8 with 66mhz fixup but it becomes the same as using a:r.
Take a look at the patch below.

>
> On the somehow related note:
>
> * I don't see how PIO0-2 command timings can be met with only 3 bits
>  used for active clocks.  Could it be that dp->eight_piospd should be
>  programmed in a slightly different way than dp->{mstr,slave}_piospd?
>

See new patch on clocks_shift below.

> * The controller allows higher clocks values for recovery timings but
>  ata_timing_compute() tries to fairly increase both recovery and active
>  timings to meet the required cycle timing.
>
>> +}
>> +
>> +static int atp867x_cable_detect(struct ata_port *ap)
>> +{
>> +     return ATA_CBL_PATA40_SHORT;
>> +}
>
> As noticed by Robert and Alan already:
>
> This should use ATA_CBL_PATA_UNK and rely on the driver-side cable detection.

I modified cable_detect() to use override; on a certain
subsystem_vendor|device, its 40short, others, unknown.

>
>
> One last thing: Power Management support is missing from this driver
> (I tried addressing this in the separately posted patch but it needs
> testing by somebody with the hardware).
>
>
> MWDMA fix:
>
> From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Subject: [PATCH] pata_atp867x: fix it to not claim MWDMA support
>
> MWDMA modes are not supported by this driver currently.
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> ---
>  drivers/ata/pata_atp867x.c |   10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> Index: b/drivers/ata/pata_atp867x.c
> ===================================================================
> --- a/drivers/ata/pata_atp867x.c
> +++ b/drivers/ata/pata_atp867x.c
> @@ -118,20 +118,13 @@ struct atp867x_priv {
>        int             pci66mhz;
>  };
>
> -static inline u8 atp867x_speed_to_mode(u8 speed)
> -{
> -       return speed - XFER_UDMA_0 + 1;
> -}
> -
>  static void atp867x_set_dmamode(struct ata_port *ap, struct ata_device *adev)
>  {
>        struct pci_dev *pdev    = to_pci_dev(ap->host->dev);
>        struct atp867x_priv *dp = ap->private_data;
>        u8 speed = adev->dma_mode;
>        u8 b;
> -       u8 mode;
> -
> -       mode = atp867x_speed_to_mode(speed);
> +       u8 mode = speed - XFER_UDMA_0 + 1;
>
>        /*
>         * Doc 6.6.9: decrease the udma mode value by 1 for safer UDMA speed
> @@ -471,7 +464,6 @@ static int atp867x_init_one(struct pci_d
>        static const struct ata_port_info info_867x = {
>                .flags          = ATA_FLAG_SLAVE_POSS,
>                .pio_mask       = ATA_PIO4,
> -               .mwdma_mask     = ATA_MWDMA2,

This looks good to me. thx.

>                .udma_mask      = ATA_UDMA6,
>                .port_ops       = &atp867x_ops,
>        };
>

From: John(Jung-Ik) Lee <jilee@google.com>

clarifications in timings calculations and cable detection

Signed-off-by: John(Jung-Ik) Lee <jilee@google.com>
---

pata_atp867x.c | 50 +++++++++++++++++++++++++++++++++++++-------------
1 files changed, 37 insertions, 13 deletions

diff --git a/drivers/ata/pata_atp867x.c b/drivers/ata/pata_atp867x.c
index e6c4706..c1c691f 100644
--- a/drivers/ata/pata_atp867x.c
+++ b/drivers/ata/pata_atp867x.c
@@ -156,8 +156,10 @@ static void atp867x_set_dmamode(struct ata_port
*ap, struct ata_device *adev)
iowrite8(b, dp->dma_mode);
}

-static int atp867x_get_active_clocks_shifted(unsigned int clk)
+static int atp867x_get_active_clocks_shifted(struct ata_port *ap,
+ unsigned int clk)
{
+ struct atp867x_priv *dp = ap->private_data;
unsigned char clocks = clk;

switch (clocks) {
@@ -166,15 +168,25 @@ static int
atp867x_get_active_clocks_shifted(unsigned int clk)
break;
case 1 ... 7:
break;
- case 8 ... 12:
+ case 9 ... 12:
clocks = 7;
break;
default:
printk(KERN_WARNING "ATP867X: active %dclk is invalid. "
"Using default 8clk.\n", clk);
- clocks = 0; /* 8 clk */
- break;
+ case 8: /* default 8 clk */
+ clocks = 0;
+ goto active_clock_shift_done;
}
+
+ /*
+ * Doc 6.6.9: increase the clock value by 1 for safer PIO speed
+ * on 66MHz bus
+ */
+ if (dp->pci66mhz && clocks < 7)
+ clocks++;
+
+active_clock_shift_done:
return clocks << ATP867X_IO_PIOSPD_ACTIVE_SHIFT;
}

@@ -188,20 +200,19 @@ static int
atp867x_get_recover_clocks_shifted(unsigned int clk)
break;
case 1 ... 11:
break;
- case 12:
- clocks = 0;
- break;
case 13: case 14:
- --clocks;
+ --clocks; /* by the spec */
break;
case 15:
break;
default:
printk(KERN_WARNING "ATP867X: recover %dclk is invalid. "
"Using default 12clk.\n", clk);
- clocks = 0; /* 12 clk */
+ case 12: /* default 12 clk */
+ clocks = 0;
break;
}
+
return clocks << ATP867X_IO_PIOSPD_RECOVER_SHIFT;
}

@@ -230,10 +241,8 @@ static void atp867x_set_piomode(struct ata_port
*ap, struct ata_device *adev)
b = (b & ~ATP867X_IO_DMAMODE_MSTR_MASK);
iowrite8(b, dp->dma_mode);

- b = atp867x_get_active_clocks_shifted(t.active) |
+ b = atp867x_get_active_clocks_shifted(ap, t.active) |
atp867x_get_recover_clocks_shifted(t.recover);
- if (dp->pci66mhz)
- b += 0x10;

if (adev->devno & 1)
iowrite8(b, dp->slave_piospd);
@@ -246,9 +255,24 @@ static void atp867x_set_piomode(struct ata_port
*ap, struct ata_device *adev)
iowrite8(b, dp->eightb_piospd);
}

+static int atp867x_cable_override(struct pci_dev *pdev)
+{
+ if (pdev->subsystem_vendor == PCI_VENDOR_ID_ARTOP &&
+ (pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867A ||
+ pdev->subsystem_device == PCI_DEVICE_ID_ARTOP_ATP867B)) {
+ return 1;
+ }
+ return 0;
+}
+
static int atp867x_cable_detect(struct ata_port *ap)
{
- return ATA_CBL_PATA40_SHORT;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+ if (atp867x_cable_override(pdev))
+ return ATA_CBL_PATA40_SHORT;
+
+ return ATA_CBL_PATA_UNK;
}

static struct scsi_host_template atp867x_sht = {