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serial: 8250: Integrate Fintek into 8250_base

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The 8250_fintek driver advertises as the PNP0501 driver; however this
conflicts with the standard 16550A uart PNP0501. The conflict causes
the 8250_fintek driver to load with _every_ PNP0501, but never probe,
and causing the entire 8250 driver stack to unload if the 8250_fintek
driver is unloaded (modprobe doesn't know that 8250_pnp rather than
8250_fintek claimed the resource).

This patch merges the Fintek driver into 8250_base. On autoconfig_16550
the device is probed to verify if it is a FINTEK device or not.

This custom probing can be disabled completely via configuration. When a
Fintek device is not probed it will behave as a standard 16550A device,
with no RS485 capabilities.

Reported-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ricardo Ribalda Delgado 2016-04-27 10:40:10 +02:00 committed by Greg Kroah-Hartman
parent bd8d257fa3
commit fa01e2ca9f
5 changed files with 42 additions and 111 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/tty/serial/8250/8250.h
View File

@ -150,6 +150,12 @@ static inline int serial8250_pnp_init(void) { return 0; }
static inline void serial8250_pnp_exit(void) { }
#endif
#ifdef CONFIG_SERIAL_8250_FINTEK
int fintek_8250_probe(struct uart_8250_port *uart);
#else
static inline int fintek_8250_probe(struct uart_8250_port *uart) { return 0; }
#endif
#ifdef CONFIG_ARCH_OMAP1
static inline int is_omap1_8250(struct uart_8250_port *pt)
{

118
drivers/tty/serial/8250/8250_fintek.c
View File

@ -1,9 +1,7 @@
/*
* Probe for F81216A LPC to 4 UART
*
* Based on drivers/tty/serial/8250_pnp.c, by Russell King, et al
*
* Copyright (C) 2014 Ricardo Ribalda, Qtechnology A/S
* Copyright (C) 2014-2016 Ricardo Ribalda, Qtechnology A/S
*
*
* This program is free software; you can redistribute it and/or modify
@ -38,19 +36,15 @@
#define RXW4C_IRA BIT(3)
#define TXW4C_IRA BIT(2)
#define DRIVER_NAME "8250_fintek"
struct fintek_8250 {
u16 base_port;
u8 index;
u8 key;
long line;
};
static int fintek_8250_enter_key(u16 base_port, u8 key)
{
if (!request_muxed_region(base_port, 2, DRIVER_NAME))
if (!request_muxed_region(base_port, 2, "8250_fintek"))
return -EBUSY;
outb(key, base_port + ADDR_PORT);
@ -138,7 +132,7 @@ static int fintek_8250_rs485_config(struct uart_port *port,
return 0;
}
static int fintek_8250_base_port(u16 io_address, u8 *key, u8 *index)
static int find_base_port(struct fintek_8250 *pdata, u16 io_address)
{
static const u16 addr[] = {0x4e, 0x2e};
static const u8 keys[] = {0x77, 0xa0, 0x87, 0x67};
@ -168,10 +162,13 @@ static int fintek_8250_base_port(u16 io_address, u8 *key, u8 *index)
continue;
fintek_8250_exit_key(addr[i]);
*key = keys[j];
*index = k;
return addr[i];
pdata->key = keys[j];
pdata->base_port = addr[i];
pdata->index = k;
return 0;
}
fintek_8250_exit_key(addr[i]);
}
}
@ -179,104 +176,21 @@ static int fintek_8250_base_port(u16 io_address, u8 *key, u8 *index)
return -ENODEV;
}
static int
fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
int fintek_8250_probe(struct uart_8250_port *uart)
{
struct uart_8250_port uart;
struct fintek_8250 *pdata;
int base_port;
u8 key;
u8 index;
struct fintek_8250 probe_data;
if (!pnp_port_valid(dev, 0))
if (find_base_port(&probe_data, uart->port.iobase))
return -ENODEV;
base_port = fintek_8250_base_port(pnp_port_start(dev, 0), &key, &index);
if (base_port < 0)
return -ENODEV;
memset(&uart, 0, sizeof(uart));
pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
pdata = devm_kzalloc(uart->port.dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
uart.port.private_data = pdata;
if (!pnp_irq_valid(dev, 0))
return -ENODEV;
uart.port.irq = pnp_irq(dev, 0);
uart.port.iobase = pnp_port_start(dev, 0);
uart.port.iotype = UPIO_PORT;
uart.port.rs485_config = fintek_8250_rs485_config;
memcpy(pdata, &probe_data, sizeof(probe_data));
uart->port.rs485_config = fintek_8250_rs485_config;
uart->port.private_data = pdata;
uart.port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
uart.port.flags |= UPF_SHARE_IRQ;
uart.port.uartclk = 1843200;
uart.port.dev = &dev->dev;
pdata->key = key;
pdata->base_port = base_port;
pdata->index = index;
pdata->line = serial8250_register_8250_port(&uart);
if (pdata->line < 0)
return -ENODEV;
pnp_set_drvdata(dev, pdata);
return 0;
}
static void fintek_8250_remove(struct pnp_dev *dev)
{
struct fintek_8250 *pdata = pnp_get_drvdata(dev);
if (pdata)
serial8250_unregister_port(pdata->line);
}
#ifdef CONFIG_PM
static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state)
{
struct fintek_8250 *pdata = pnp_get_drvdata(dev);
if (!pdata)
return -ENODEV;
serial8250_suspend_port(pdata->line);
return 0;
}
static int fintek_8250_resume(struct pnp_dev *dev)
{
struct fintek_8250 *pdata = pnp_get_drvdata(dev);
if (!pdata)
return -ENODEV;
serial8250_resume_port(pdata->line);
return 0;
}
#else
#define fintek_8250_suspend NULL
#define fintek_8250_resume NULL
#endif /* CONFIG_PM */
static const struct pnp_device_id fintek_dev_table[] = {
/* Qtechnology Panel PC / IO1000 */
{ "PNP0501"},
{}
};
MODULE_DEVICE_TABLE(pnp, fintek_dev_table);
static struct pnp_driver fintek_8250_driver = {
.name = DRIVER_NAME,
.probe = fintek_8250_probe,
.remove = fintek_8250_remove,
.suspend = fintek_8250_suspend,
.resume = fintek_8250_resume,
.id_table = fintek_dev_table,
};
module_pnp_driver(fintek_8250_driver);
MODULE_DESCRIPTION("Fintek F812164 module");
MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
MODULE_LICENSE("GPL");

7
drivers/tty/serial/8250/8250_port.c
View File

@ -1315,6 +1315,13 @@ static void autoconfig(struct uart_8250_port *up)
out_lock:
spin_unlock_irqrestore(&port->lock, flags);
/*
* Check if the device is a Fintek F81216A
*/
if (port->type == PORT_16550A)
fintek_8250_probe(up);
if (up->capabilities != old_capabilities) {
pr_warn("ttyS%d: detected caps %08x should be %08x\n",
serial_index(port), old_capabilities,

20
drivers/tty/serial/8250/Kconfig
View File

@ -57,6 +57,18 @@ config SERIAL_8250_PNP
This builds standard PNP serial support. You may be able to
disable this feature if you only need legacy serial support.
config SERIAL_8250_FINTEK
bool "Support for Fintek F81216A LPC to 4 UART RS485 API"
depends on SERIAL_8250
---help---
Selecting this option will add support for the RS485 capabilities
of the Fintek F81216A LPC to 4 UART.
If this option is not selected the device will be configured as a
standard 16550A serial port.
If unsure, say N.
config SERIAL_8250_CONSOLE
bool "Console on 8250/16550 and compatible serial port"
depends on SERIAL_8250=y
@ -358,14 +370,6 @@ config SERIAL_8250_OMAP_TTYO_FIXUP
not booting kernel because the serial console remains silent in case
they forgot to update the command line.
config SERIAL_8250_FINTEK
tristate "Support for Fintek F81216A LPC to 4 UART"
depends on SERIAL_8250 && PNP
help
Selecting this option will add support for the Fintek F81216A
LPC to 4 UART. This device has some RS485 functionality not available
through the PNP driver. If unsure, say N.
config SERIAL_8250_LPC18XX
tristate "NXP LPC18xx/43xx serial port support"
depends on SERIAL_8250 && OF && (ARCH_LPC18XX || COMPILE_TEST)

2
drivers/tty/serial/8250/Makefile
View File

@ -7,6 +7,7 @@ obj-$(CONFIG_SERIAL_8250) += 8250.o 8250_base.o
8250-$(CONFIG_SERIAL_8250_PNP) += 8250_pnp.o
8250_base-y := 8250_port.o
8250_base-$(CONFIG_SERIAL_8250_DMA) += 8250_dma.o
8250_base-$(CONFIG_SERIAL_8250_FINTEK) += 8250_fintek.o
obj-$(CONFIG_SERIAL_8250_GSC) += 8250_gsc.o
obj-$(CONFIG_SERIAL_8250_PCI) += 8250_pci.o
obj-$(CONFIG_SERIAL_8250_HP300) += 8250_hp300.o
@ -23,7 +24,6 @@ obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o
obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o
obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o
obj-$(CONFIG_SERIAL_8250_FINTEK) += 8250_fintek.o
obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o
obj-$(CONFIG_SERIAL_8250_MT6577) += 8250_mtk.o
obj-$(CONFIG_SERIAL_8250_UNIPHIER) += 8250_uniphier.o