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serial: 8250_pci: Correct uartclk for xr17v35x expansion chips

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The internal clock of the master chip, which is usually 125MHz, is only half
(62.5MHz) for the slave chips. So we have to adjust the uartclk for all the
slave ports. Therefor we add a new function to determine if a slave chip is
present and update pci_xr17v35x_setup accordingly.

Signed-off-by: Soeren Grunewald <soeren.grunewald@desy.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Soeren Grunewald 2015-06-11 09:25:05 +02:00 committed by Greg Kroah-Hartman
parent be32c0cf04
commit 899f0c1c7d
1 changed files with 19 additions and 3 deletions
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22
drivers/tty/serial/8250/8250_pci.c
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@ -1823,6 +1823,9 @@ static int pci_eg20t_init(struct pci_dev *dev)
#endif
}
#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
static int
pci_xr17c154_setup(struct serial_private *priv,
const struct pciserial_board *board,
@ -1832,6 +1835,15 @@ pci_xr17c154_setup(struct serial_private *priv,
return pci_default_setup(priv, board, port, idx);
}
static inline int
xr17v35x_has_slave(struct serial_private *priv)
{
const int dev_id = priv->dev->device;
return ((dev_id == PCI_DEVICE_ID_EXAR_XR17V4358) ||
(dev_id == PCI_DEVICE_ID_EXAR_XR17V8358));
}
static int
pci_xr17v35x_setup(struct serial_private *priv,
const struct pciserial_board *board,
@ -1845,6 +1857,13 @@ pci_xr17v35x_setup(struct serial_private *priv,
port->port.flags |= UPF_EXAR_EFR;
/*
* Setup the uart clock for the devices on expansion slot to
* half the clock speed of the main chip (which is 125MHz)
*/
if (xr17v35x_has_slave(priv) && idx >= 8)
port->port.uartclk = (7812500 * 16 / 2);
/*
* Setup Multipurpose Input/Output pins.
*/
@ -1998,9 +2017,6 @@ pci_wch_ch38x_setup(struct serial_private *priv,
#define PCIE_DEVICE_ID_WCH_CH382_2S1P 0x3250
#define PCIE_DEVICE_ID_WCH_CH384_4S 0x3470
#define PCI_DEVICE_ID_EXAR_XR17V4358 0x4358
#define PCI_DEVICE_ID_EXAR_XR17V8358 0x8358
/* Unknown vendors/cards - this should not be in linux/pci_ids.h */
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1584 0x1584
#define PCI_SUBDEVICE_ID_UNKNOWN_0x1588 0x1588