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8250: add support for ASIX devices with a FIFO bug 

Information and a different patch provided by <donald@asix.com.tw>. We do
it a little differently to keep the modularity and to avoid playing with
RLSI.

We add a new uart bug for the parity flaw and set it in the pci matches.
If parity check is enabled then we drop the FIFO trigger to 1 as per the
Asix reference code.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Cox 2012-07-12 13:00:31 +01:00 committed by Greg Kroah-Hartman
parent a2d33d87d8
commit eb26dfe8aa
3 changed files with 28 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/tty/serial/8250/8250.c
View File

@ -2202,6 +2202,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
unsigned char cval, fcr = 0;
unsigned long flags;
unsigned int baud, quot;
int fifo_bug = 0;
switch (termios->c_cflag & CSIZE) {
case CS5:
@ -2221,8 +2222,11 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
if (termios->c_cflag & CSTOPB)
cval |= UART_LCR_STOP;
if (termios->c_cflag & PARENB)
if (termios->c_cflag & PARENB) {
cval |= UART_LCR_PARITY;
if (up->bugs & UART_BUG_PARITY)
fifo_bug = 1;
}
if (!(termios->c_cflag & PARODD))
cval |= UART_LCR_EPAR;
#ifdef CMSPAR
@ -2246,7 +2250,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
if (up->capabilities & UART_CAP_FIFO && port->fifosize > 1) {
fcr = uart_config[port->type].fcr;
if (baud < 2400) {
if (baud < 2400 || fifo_bug) {
fcr &= ~UART_FCR_TRIGGER_MASK;
fcr |= UART_FCR_TRIGGER_1;
}

1
drivers/tty/serial/8250/8250.h
View File

@ -78,6 +78,7 @@ struct serial8250_config {
#define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */
#define UART_BUG_NOMSR (1 << 2) /* UART has buggy MSR status bits (Au1x00) */
#define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */
#define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */
#define PROBE_RSA (1 << 0)
#define PROBE_ANY (~0)

24
drivers/tty/serial/8250/8250_pci.c
View File

@ -1032,8 +1032,15 @@ static int pci_oxsemi_tornado_init(struct pci_dev *dev)
return number_uarts;
}
static int
pci_default_setup(struct serial_private *priv,
static int pci_asix_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
port->bugs |= UART_BUG_PARITY;
return pci_default_setup(priv, board, port, idx);
}
static int pci_default_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_8250_port *port, int idx)
{
@ -1187,6 +1194,7 @@ pci_xr17c154_setup(struct serial_private *priv,
#define PCIE_DEVICE_ID_NEO_2_OX_IBM 0x00F6
#define PCI_DEVICE_ID_PLX_CRONYX_OMEGA 0xc001
#define PCI_DEVICE_ID_INTEL_PATSBURG_KT 0x1d3d
#define PCI_VENDOR_ID_ASIX 0x9710
/* Unknown vendors/cards - this should not be in linux/pci_ids.h */
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584
@ -1726,7 +1734,17 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_omegapci_setup,
},
},
/*
* ASIX devices with FIFO bug
*/
{
.vendor = PCI_VENDOR_ID_ASIX,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_asix_setup,
},
/*
* Default "match everything" terminator entry
*/