linux-kernel - Re: [PATCHv2] serial: 8250: Add Quark X1000 to 8250 PCI driver

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Date:	Fri, 19 Sep 2014 14:34:57 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	"Bryan O'Donoghue" <pure.logic@...us-software.ie>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	jslaby@...e.cz,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org,
	"Chew, Kean Ho" <kean.ho.chew@...el.com>
Subject: Re: [PATCHv2] serial: 8250: Add Quark X1000 to 8250 PCI driver

On Fri, Sep 19, 2014 at 1:58 PM, Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
> On Fri, Sep 19, 2014 at 08:43:49AM +0100, Bryan O'Donoghue wrote:
>> Adds PCI identifier for the X1000
>> Adds clocking and register size and register shift
>>
>> Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
>> ---
>>  drivers/tty/serial/8250/8250_pci.c | 33 +++++++++++++++++++++++++++++++++
>>  1 file changed, 33 insertions(+)
>
> The UART on Quark SoC has an integrated DMA engine and Kean Ho (CC'd)
> is working with support for it. The plan is to add completely separate
> probe driver for the Quark UART. Dealing with the integrated DMA
> engine is too much for a quirk in 8250_pci.c.
>
> So we can take this now and when Kean Ho is ready he needs to
> basically revert it, or you could already introduce the new probe
> driver, 8250_quark.c, and Kean Ho can then add the DMA engine handling
> later to it.
>
> IMO we should add the 8250_quark.c already now.

I'm working on providing dw_dma_probe()/_remove() for the kernel
users. Besides that the serial setup should look like a BYT version
(of course, the device would be different which does DMA). I would try
not to forget to Cc'ed you when I send patch series to the dmaengine
mailing list.

>
>
>> diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
>> index 61830b1..5e72959 100644
>> --- a/drivers/tty/serial/8250/8250_pci.c
>> +++ b/drivers/tty/serial/8250/8250_pci.c
>> @@ -1481,6 +1481,19 @@ byt_serial_setup(struct serial_private *priv,
>>       return ret;
>>  }
>>
>> +#define PCI_DEVICE_ID_INTEL_QRK_UART 0x0936
>> +
>> +static int
>> +pci_intel_qrk_setup(struct serial_private *priv,
>> +             const struct pciserial_board *board,
>> +             struct uart_8250_port *port, int idx)
>> +{
>> +     unsigned int bar, offset = board->first_offset;
>> +
>> +     bar = FL_GET_BASE(board->flags);
>> +
>> +     return setup_port(priv, port, bar, offset, board->reg_shift);
>> +}
>>  static int
>>  pci_omegapci_setup(struct serial_private *priv,
>>                     const struct pciserial_board *board,
>> @@ -1898,6 +1911,13 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
>>               .subdevice      = PCI_ANY_ID,
>>               .setup          = byt_serial_setup,
>>       },
>> +     {
>> +             .vendor         = PCI_VENDOR_ID_INTEL,
>> +             .device         = PCI_DEVICE_ID_INTEL_QRK_UART,
>> +             .subvendor      = PCI_ANY_ID,
>> +             .subdevice      = PCI_ANY_ID,
>> +             .setup          = pci_intel_qrk_setup,
>> +     },
>>       /*
>>        * ITE
>>        */
>> @@ -2740,6 +2760,7 @@ enum pci_board_num_t {
>>       pbn_ADDIDATA_PCIe_8_3906250,
>>       pbn_ce4100_1_115200,
>>       pbn_byt,
>> +     pbn_qrk,
>>       pbn_omegapci,
>>       pbn_NETMOS9900_2s_115200,
>>       pbn_brcm_trumanage,
>> @@ -3490,6 +3511,12 @@ static struct pciserial_board pci_boards[] = {
>>               .uart_offset    = 0x80,
>>               .reg_shift      = 2,
>>       },
>> +     [pbn_qrk] = {
>> +             .flags          = FL_BASE0,
>> +             .num_ports      = 1,
>> +             .base_baud      = 2764800,
>> +             .reg_shift      = 2,
>> +     },
>>       [pbn_omegapci] = {
>>               .flags          = FL_BASE0,
>>               .num_ports      = 8,
>> @@ -5192,6 +5219,12 @@ static struct pci_device_id serial_pci_tbl[] = {
>>               pbn_byt },
>>
>>       /*
>> +      * Intel Quark x1000
>> +      */
>> +     {       PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_QRK_UART,
>> +             PCI_ANY_ID, PCI_ANY_ID, 0, 0,
>> +             pbn_qrk },
>> +     /*
>>        * Cronyx Omega PCI
>>        */
>>       {       PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_CRONYX_OMEGA,
>> --
>> 1.9.1
>
> Cheers,
>
> --
> heikki
> --
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-- 
With Best Regards,
Andy Shevchenko
--
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