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serial: 8250: Add support for higher baud rates to Pericom chips
The Pericom chips can achieve additional baud rates by programming the sample clock register. The baud rates can be described as 921600 * 16 / (16 - scr) for scr values 5 to 15. The divisor is set to 1 for these baud rates. Adds new quirk for Pericom chips other than the four port chips to use the Signed-off-by: Jay Dolan <jay.dolan@accesio.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jay Dolan
Greg Kroah-Hartman
parent
4e828c3e09
commit
6bf4e42f1d
@ -1326,13 +1326,66 @@ static int pci_default_setup(struct serial_private *priv,
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return setup_port(priv, port, bar, offset, board->reg_shift);
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}
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void
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pericom_do_set_divisor(struct uart_port *port, unsigned int baud,
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unsigned int quot, unsigned int quot_frac)
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{
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int scr;
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int lcr;
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int actual_baud;
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int tolerance;
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for (scr = 5 ; scr <= 15 ; scr++) {
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actual_baud = 921600 * 16 / scr;
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tolerance = actual_baud / 50;
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if ((baud < actual_baud + tolerance) &&
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(baud > actual_baud - tolerance)) {
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lcr = serial_port_in(port, UART_LCR);
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serial_port_out(port, UART_LCR, lcr | 0x80);
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serial_port_out(port, UART_DLL, 1);
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serial_port_out(port, UART_DLM, 0);
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serial_port_out(port, 2, 16 - scr);
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serial_port_out(port, UART_LCR, lcr);
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return;
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} else if (baud > actual_baud) {
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break;
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}
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}
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serial8250_do_set_divisor(port, baud, quot, quot_frac);
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}
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static int pci_pericom_setup(struct serial_private *priv,
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const struct pciserial_board *board,
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struct uart_8250_port *port, int idx)
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{
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unsigned int bar, offset = board->first_offset, maxnr;
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bar = FL_GET_BASE(board->flags);
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if (board->flags & FL_BASE_BARS)
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bar += idx;
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else
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offset += idx * board->uart_offset;
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maxnr = (pci_resource_len(priv->dev, bar) - board->first_offset) >>
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(board->reg_shift + 3);
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if (board->flags & FL_REGION_SZ_CAP && idx >= maxnr)
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return 1;
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port->port.set_divisor = pericom_do_set_divisor;
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return setup_port(priv, port, bar, offset, board->reg_shift);
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}
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static int pci_pericom_setup_four_at_eight(struct serial_private *priv,
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const struct pciserial_board *board,
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struct uart_8250_port *port, int idx)
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{
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unsigned int bar, offset = board->first_offset, maxnr;
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bar = FL_GET_BASE(board->flags);
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if (board->flags & FL_BASE_BARS)
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bar += idx;
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@ -1348,6 +1401,8 @@ static int pci_pericom_setup(struct serial_private *priv,
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if (board->flags & FL_REGION_SZ_CAP && idx >= maxnr)
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return 1;
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port->port.set_divisor = pericom_do_set_divisor;
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return setup_port(priv, port, bar, offset, board->reg_shift);
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}
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@ -1995,7 +2050,7 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
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.device = PCI_DEVICE_ID_PERICOM_PI7C9X7954,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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/*
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* PLX
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@ -2032,107 +2087,113 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM_4SDB,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_COM_4S,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM232_4DB,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_COM232_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM_4SMDB,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_COM_4SM,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_ICM422_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_ICM485_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_DEVICE_ID_ACCESIO_PCIE_ICM_4S,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_ICM232_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_MPCIE_ICM232_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM422_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM485_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM232_4,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_COM_4SM,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_DEVICE_ID_ACCESIO_PCIE_ICM_4SM,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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.setup = pci_pericom_setup_four_at_eight,
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},
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/*
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{
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.vendor = PCI_VENDOR_ID_ACCESIO,
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.device = PCI_ANY_ID,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.setup = pci_pericom_setup,
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}, /*
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* SBS Technologies, Inc., PMC-OCTALPRO 232
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*/
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{
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