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serial: Support the EFR-register of XR1715x uarts. 

The EFR (Enhenced-Features-Register) is located at a different offset
than the other devices supporting UART_CAP_EFR. This change add a special
setup quick to set UPF_EXAR_EFR on the port. UPF_EXAR_EFR is then used to
the port type to PORT_XR17D15X since it is for sure a XR17D15X uart.

Signed-off-by: Søren Holm <sgh@sgh.dk>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Søren Holm 2011-09-02 22:55:37 +02:00 committed by Greg Kroah-Hartman
parent 2f7861de11
commit 06315348b1
4 changed files with 56 additions and 2 deletions
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20
drivers/tty/serial/8250.c
View File

@ -309,6 +309,13 @@ static const struct serial8250_config uart_config[] = {
UART_FCR_T_TRIG_01,
.flags = UART_CAP_FIFO | UART_CAP_RTOIE,
},
[PORT_XR17D15X] = {
.name = "XR17D15X",
.fifo_size = 64,
.tx_loadsz = 64,
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.flags = UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR,
},
};
#if defined(CONFIG_MIPS_ALCHEMY)
@ -1074,6 +1081,14 @@ static void autoconfig_16550a(struct uart_8250_port *up)
}
serial_outp(up, UART_IER, iersave);
/*
* Exar uarts have EFR in a weird location
*/
if (up->port.flags & UPF_EXAR_EFR) {
up->port.type = PORT_XR17D15X;
up->capabilities |= UART_CAP_AFE | UART_CAP_EFR;
}
/*
* We distinguish between 16550A and U6 16550A by counting
* how many bytes are in the FIFO.
@ -2417,7 +2432,10 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
efr |= UART_EFR_CTS;
serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
serial_outp(up, UART_EFR, efr);
if (up->port.flags & UPF_EXAR_EFR)
serial_outp(up, UART_XR_EFR, efr);
else
serial_outp(up, UART_EFR, efr);
}
#ifdef CONFIG_ARCH_OMAP

33
drivers/tty/serial/8250_pci.c
View File

@ -1101,6 +1101,15 @@ static int pci_eg20t_init(struct pci_dev *dev)
#endif
}
static int
pci_xr17c154_setup(struct serial_private *priv,
const struct pciserial_board *board,
struct uart_port *port, int idx)
{
port->flags |= UPF_EXAR_EFR;
return pci_default_setup(priv, board, port, idx);
}
/* This should be in linux/pci_ids.h */
#define PCI_VENDOR_ID_SBSMODULARIO 0x124B
#define PCI_SUBVENDOR_ID_SBSMODULARIO 0x124B
@ -1505,6 +1514,30 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
.subdevice = PCI_ANY_ID,
.setup = pci_timedia_setup,
},
/*
* Exar cards
*/
{
.vendor = PCI_VENDOR_ID_EXAR,
.device = PCI_DEVICE_ID_EXAR_XR17C152,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_xr17c154_setup,
},
{
.vendor = PCI_VENDOR_ID_EXAR,
.device = PCI_DEVICE_ID_EXAR_XR17C154,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_xr17c154_setup,
},
{
.vendor = PCI_VENDOR_ID_EXAR,
.device = PCI_DEVICE_ID_EXAR_XR17C158,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.setup = pci_xr17c154_setup,
},
/*
* Xircom cards
*/

4
include/linux/serial_core.h
View File

@ -46,7 +46,8 @@
#define PORT_AR7 18 /* Texas Instruments AR7 internal UART */
#define PORT_U6_16550A 19 /* ST-Ericsson U6xxx internal UART */
#define PORT_TEGRA 20 /* NVIDIA Tegra internal UART */
#define PORT_MAX_8250 20 /* max port ID */
#define PORT_XR17D15X 21 /* Exar XR17D15x UART */
#define PORT_MAX_8250 21 /* max port ID */
/*
* ARM specific type numbers. These are not currently guaranteed
@ -349,6 +350,7 @@ struct uart_port {
#define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
#define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
#define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
/* The exact UART type is known and should not be probed. */
#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))

1
include/linux/serial_reg.h
View File

@ -152,6 +152,7 @@
* LCR=0xBF (or DLAB=1 for 16C660)
*/
#define UART_EFR 2 /* I/O: Extended Features Register */
#define UART_XR_EFR 9 /* I/O: Extended Features Register (XR17D15x) */
#define UART_EFR_CTS 0x80 /* CTS flow control */
#define UART_EFR_RTS 0x40 /* RTS flow control */
#define UART_EFR_SCD 0x20 /* Special character detect */