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authorAngelo Butti <buttiangelo@gmail.com>2016-11-07 16:39:03 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-11-10 14:41:25 +0100
commit5c31ef91c06db7800ad573174bd92be4df34ecb2 (patch)
tree172ff2d843b9ee78ad9c4a3e7980fca4010b5477 /drivers/tty
parent6fc5a520429e29ae84cb9ce8e8c584166a54a1ee (diff)
downloadlinux-5c31ef91c06db7800ad573174bd92be4df34ecb2.tar.bz2
8250: FIX Fourth port offset of Pericom PI7C9X7954 boards
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_pci.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index b98c1578f45a..5aeabf732d74 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -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,
@@ -2096,6 +2120,16 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
.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
*/
{