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serial: exar: Factor out platform hooks 

This prepares the addition of IOT2040 platform support by preparing the
needed setup and rs485_config hooks.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Kiszka 2017-06-02 07:27:59 +02:00
parent 4076cf08ac
commit 0d963ebf57
1 changed files with 27 additions and 5 deletions
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32
drivers/tty/serial/8250/8250_exar.c
View File

@ -63,6 +63,11 @@
struct exar8250;
struct exar8250_platform {
int (*rs485_config)(struct uart_port *, struct serial_rs485 *);
int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
};
/**
* struct exar8250_board - board information
* @num_ports: number of serial ports
@ -189,7 +194,7 @@ static void setup_gpio(u8 __iomem *p)
}
static void *
xr17v35x_register_gpio(struct pci_dev *pcidev)
__xr17v35x_register_gpio(struct pci_dev *pcidev)
{
struct platform_device *pdev;
@ -208,17 +213,36 @@ xr17v35x_register_gpio(struct pci_dev *pcidev)
return pdev;
}
static int xr17v35x_register_gpio(struct pci_dev *pcidev,
struct uart_8250_port *port)
{
if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
port->port.private_data =
__xr17v35x_register_gpio(pcidev);
return 0;
}
static const struct exar8250_platform exar8250_default_platform = {
.register_gpio = xr17v35x_register_gpio,
};
static int
pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
struct uart_8250_port *port, int idx)
{
const struct exar8250_board *board = priv->board;
const struct exar8250_platform *platform;
unsigned int offset = idx * 0x400;
unsigned int baud = 7812500;
u8 __iomem *p;
int ret;
platform = &exar8250_default_platform;
port->port.uartclk = baud * 16;
port->port.rs485_config = platform->rs485_config;
/*
* Setup the uart clock for the devices on expansion slot to
* half the clock speed of the main chip (which is 125MHz)
@ -241,12 +265,10 @@ pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,
/* Setup Multipurpose Input/Output pins. */
setup_gpio(p);
if (pcidev->vendor == PCI_VENDOR_ID_EXAR)
port->port.private_data =
xr17v35x_register_gpio(pcidev);
ret = platform->register_gpio(pcidev, port);
}
return 0;
return ret;
}
static void pci_xr17v35x_exit(struct pci_dev *pcidev)