4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Angelo Butti <buttiangelo@xxxxxxxxx>
commit 5c31ef91c06db7800ad573174bd92be4df34ecb2 upstream.
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@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_pci.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1330,6 +1330,30 @@ static int pci_default_setup(struct seri
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,
@@ -2097,6 +2121,16 @@ static struct pci_serial_quirk pci_seria
.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
*/
{
