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8250: FIX Fourth port offset of Pericom PI7C9X7954 boards

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Hi,
below patch to fix Fourth port offset of Percom PI7C9X7954 boards.

I had a problem using Fourth port on a pci express serial board based on Pericom
PI7C9X7954. Reading datasheet I notice a "special" offset assign to this port
when used in I/O mode.

Offset 0x0 ->  UART 0
Offset 0x8 ->  UART 1
Offset 0x10 ->  UART 2
Offset 0x38 ->  UART 3  <<---- This don't follow a logical sequence

This patch add a different init to last port, to have right offset.

I check also Pericom 7952 and 7958 but that devices follow logical sequence,
so they are ok.

Regards,
Angelo

Signed-off-by: Angelo Butti <buttiangelo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Angelo Butti 2016-11-07 16:39:03 +01:00 committed by Greg Kroah-Hartman
parent 6fc5a52042
commit 5c31ef91c0
1 changed files with 34 additions and 0 deletions
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34
drivers/tty/serial/8250/8250_pci.c
View file

@ -1329,6 +1329,30 @@ static int pci_default_setup(struct serial_private *priv,
return setup_port(priv, port, bar, offset, board->reg_shift);
}
static int pci_pericom_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
unsigned int bar, offset = board->first_offset, maxnr;
bar = FL_GET_BASE(board->flags);
if (board->flags & FL_BASE_BARS)
bar += idx;
else
offset += idx * board->uart_offset;
if (idx==3)
offset = 0x38;
maxnr = (pci_resource_len(priv->dev, bar) - board->first_offset) >>
(board->reg_shift + 3);
if (board->flags & FL_REGION_SZ_CAP && idx >= maxnr)
return 1;
return setup_port(priv, port, bar, offset, board->reg_shift);
}
static int
ce4100_serial_setup(struct serial_private *priv,
const struct pciserial_board *board,
@ -2095,6 +2119,16 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
.setup = pci_default_setup,
.exit = pci_plx9050_exit,
},
/*
* Pericom (Only 7954 - It have a offset jump for port 4)
*/
{
.vendor = PCI_VENDOR_ID_PERICOM,
.device = PCI_DEVICE_ID_PERICOM_PI7C9X7954,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_pericom_setup,
},
/*
* PLX
*/