serial: Add support for Fintek F81216A LPC to 4 UART
authorRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Thu, 31 Jul 2014 19:22:26 +0000 (21:22 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 8 Sep 2014 22:26:26 +0000 (15:26 -0700)
This patch lets you set the RS485 cappabilites of the device through
TIOCSRS485 and TIOCGRS485 as defined on Documentation/serial/serial-rs485.txt

In order to probe the device, the PNP id and the device id is used.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/8250/8250_fintek.c [new file with mode: 0644]
drivers/tty/serial/8250/Kconfig
drivers/tty/serial/8250/Makefile

diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
new file mode 100644 (file)
index 0000000..1bb28cb
--- /dev/null
@@ -0,0 +1,249 @@
+/*
+ *  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
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pnp.h>
+#include <linux/kernel.h>
+#include <linux/serial_core.h>
+#include  "8250.h"
+
+#define ADDR_PORT 0x4E
+#define DATA_PORT 0x4F
+#define ENTRY_KEY 0x77
+#define EXIT_KEY 0xAA
+#define CHIP_ID1  0x20
+#define CHIP_ID1_VAL 0x02
+#define CHIP_ID2  0x21
+#define CHIP_ID2_VAL 0x16
+#define VENDOR_ID1 0x23
+#define VENDOR_ID1_VAL 0x19
+#define VENDOR_ID2 0x24
+#define VENDOR_ID2_VAL 0x34
+#define LDN 0x7
+
+#define RS485  0xF0
+#define RTS_INVERT BIT(5)
+#define RS485_URA BIT(4)
+#define RXW4C_IRA BIT(3)
+#define TXW4C_IRA BIT(2)
+
+#define DRIVER_NAME "8250_fintek"
+
+static int fintek_8250_enter_key(void){
+
+       if (!request_muxed_region(ADDR_PORT, 2, DRIVER_NAME))
+               return -EBUSY;
+
+       outb(ENTRY_KEY, ADDR_PORT);
+       outb(ENTRY_KEY, ADDR_PORT);
+       return 0;
+}
+
+static void fintek_8250_exit_key(void){
+
+       outb(EXIT_KEY, ADDR_PORT);
+       release_region(ADDR_PORT, 2);
+}
+
+static int fintek_8250_get_index(resource_size_t base_addr)
+{
+       resource_size_t base[] = {0x3f8, 0x2f8, 0x3e8, 0x2e8};
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(base); i++)
+               if (base_addr == base[i])
+                       return i;
+
+       return -ENODEV;
+}
+
+static int fintek_8250_check_id(void)
+{
+
+       outb(CHIP_ID1, ADDR_PORT);
+       if (inb(DATA_PORT) != CHIP_ID1_VAL)
+               return -ENODEV;
+
+       outb(CHIP_ID2, ADDR_PORT);
+       if (inb(DATA_PORT) != CHIP_ID2_VAL)
+               return -ENODEV;
+
+       outb(VENDOR_ID1, ADDR_PORT);
+       if (inb(DATA_PORT) != VENDOR_ID1_VAL)
+               return -ENODEV;
+
+       outb(VENDOR_ID2, ADDR_PORT);
+       if (inb(DATA_PORT) != VENDOR_ID2_VAL)
+               return -ENODEV;
+
+       return 0;
+}
+
+static int fintek_8250_rs4850_config(struct uart_8250_port *uart,
+                             struct serial_rs485 *rs485)
+{
+       uint8_t config = 0;
+       int index = fintek_8250_get_index(uart->port.iobase);
+
+       if (index < 0)
+               return -EINVAL;
+
+       if (rs485->flags & SER_RS485_ENABLED)
+               memset(rs485->padding, 0, sizeof(rs485->padding));
+       else
+               memset(rs485, 0, sizeof(*rs485));
+
+       rs485->flags &= SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND |
+                       SER_RS485_RTS_AFTER_SEND;
+
+       if (rs485->delay_rts_before_send) {
+               rs485->delay_rts_before_send = 1;
+               config |= TXW4C_IRA;
+       }
+
+       if (rs485->delay_rts_after_send) {
+               rs485->delay_rts_after_send = 1;
+               config |= RXW4C_IRA;
+       }
+
+       if ((!!(rs485->flags & SER_RS485_RTS_ON_SEND)) ==
+                       (!!(rs485->flags & SER_RS485_RTS_AFTER_SEND)))
+               rs485->flags &= SER_RS485_ENABLED;
+       else
+               config |= RS485_URA;
+
+       if (rs485->flags & SER_RS485_RTS_ON_SEND)
+               config |= RTS_INVERT;
+
+       if (fintek_8250_enter_key())
+               return -EBUSY;
+
+       outb(LDN, ADDR_PORT);
+       outb(index, DATA_PORT);
+       outb(RS485, ADDR_PORT);
+       outb(config, DATA_PORT);
+       fintek_8250_exit_key();
+
+       return 0;
+}
+
+static int
+fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
+{
+       int line;
+       struct uart_8250_port uart;
+       int ret;
+
+       if (!pnp_port_valid(dev, 0))
+               return -ENODEV;
+
+       if (fintek_8250_get_index(pnp_port_start(dev, 0)) < 0)
+               return -ENODEV;
+
+       /* Enable configuration registers*/
+       if (fintek_8250_enter_key())
+               return -EBUSY;
+
+       /*Check ID*/
+       ret = fintek_8250_check_id();
+       fintek_8250_exit_key();
+       if (ret)
+               return ret;
+
+       memset(&uart, 0, sizeof(uart));
+       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.rs485_config = fintek_8250_rs4850_config;
+
+       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;
+
+       line = serial8250_register_8250_port(&uart);
+       if (line < 0)
+               return -ENODEV;
+
+       pnp_set_drvdata(dev, (void *)((long)line + 1));
+       return 0;
+}
+
+static void fintek_8250_remove(struct pnp_dev *dev)
+{
+       long line = (long)pnp_get_drvdata(dev);
+
+       if (line)
+               serial8250_unregister_port(line - 1);
+}
+
+#ifdef CONFIG_PM
+static int fintek_8250_suspend(struct pnp_dev *dev, pm_message_t state)
+{
+       long line = (long)pnp_get_drvdata(dev);
+
+       if (!line)
+               return -ENODEV;
+       serial8250_suspend_port(line - 1);
+       return 0;
+}
+
+static int fintek_8250_resume(struct pnp_dev *dev)
+{
+       long line = (long)pnp_get_drvdata(dev);
+
+       if (!line)
+               return -ENODEV;
+       serial8250_resume_port(line - 1);
+       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,
+};
+
+static int fintek_8250_init(void)
+{
+       return pnp_register_driver(&fintek_8250_driver);
+}
+module_init(fintek_8250_init);
+
+static void fintek_8250_exit(void)
+{
+       pnp_unregister_driver(&fintek_8250_driver);
+}
+module_exit(fintek_8250_exit);
+
+MODULE_DESCRIPTION("Fintek F812164 module");
+MODULE_AUTHOR("Ricardo Ribalda <ricardo.ribalda@gmail.com>");
+MODULE_LICENSE("GPL");
index 349ee598b34cf5bdf037028e10d4cf68aad6667d..8b5c40a047aa5d9679a6d63ed9d717d325d75d3f 100644 (file)
@@ -298,3 +298,12 @@ config SERIAL_8250_RT288X
          If you have a Ralink RT288x/RT305x SoC based board and want to use the
          serial port, say Y to this option. The driver can handle up to 2 serial
          ports. If unsure, say N.
+
+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.
+
index 36d68d0543072c21f48807d3b932ed426e843685..e08407de37a5e48a72d4566d7fb5904937c099c9 100644 (file)
@@ -20,3 +20,4 @@ obj-$(CONFIG_SERIAL_8250_HUB6)                += 8250_hub6.o
 obj-$(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_FINTEK)       += 8250_fintek.o