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Message-Id: <1434377926-31958-3-git-send-email-ricardo.ribalda@gmail.com>
Date: Mon, 15 Jun 2015 16:18:43 +0200
From: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...e.cz>, Alan Cox <alan@...ux.intel.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Peter Huewe <PeterHuewe@....de>, linux-serial@...r.kernel.org,
linux-kernel@...r.kernel.org, peter_hong@...tek.com.tw
Cc: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH 2/5] serial/8250_fintek: Support for multiple base_ports
Fintek chip can be connected at address 0x4e and also 0x2e.
Add some logic to find out the address of the chip.
Reported-by: Peter Hong <peter_hong@...tek.com.tw>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
drivers/tty/serial/8250/8250_fintek.c | 87 +++++++++++++++++++++--------------
1 file changed, 52 insertions(+), 35 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_fintek.c b/drivers/tty/serial/8250/8250_fintek.c
index c7f1485e6a54..ec64ae5f3bb3 100644
--- a/drivers/tty/serial/8250/8250_fintek.c
+++ b/drivers/tty/serial/8250/8250_fintek.c
@@ -17,8 +17,8 @@
#include <linux/serial_core.h>
#include "8250.h"
-#define ADDR_PORT 0x4E
-#define DATA_PORT 0x4F
+#define ADDR_PORT 0
+#define DATA_PORT 1
#define ENTRY_KEY 0x77
#define EXIT_KEY 0xAA
#define CHIP_ID1 0x20
@@ -40,24 +40,27 @@
#define DRIVER_NAME "8250_fintek"
struct fintek_8250 {
+ u16 base_port;
u8 index;
long line;
};
-static int fintek_8250_enter_key(void){
+static int fintek_8250_enter_key(u16 base_port)
+{
- if (!request_muxed_region(ADDR_PORT, 2, DRIVER_NAME))
+ if (!request_muxed_region(base_port, 2, DRIVER_NAME))
return -EBUSY;
- outb(ENTRY_KEY, ADDR_PORT);
- outb(ENTRY_KEY, ADDR_PORT);
+ outb(ENTRY_KEY, base_port + ADDR_PORT);
+ outb(ENTRY_KEY, base_port + ADDR_PORT);
return 0;
}
-static void fintek_8250_exit_key(void){
+static void fintek_8250_exit_key(u16 base_port)
+{
- outb(EXIT_KEY, ADDR_PORT);
- release_region(ADDR_PORT, 2);
+ outb(EXIT_KEY, base_port + ADDR_PORT);
+ release_region(base_port + ADDR_PORT, 2);
}
static int fintek_8250_get_index(resource_size_t base_addr)
@@ -72,23 +75,23 @@ static int fintek_8250_get_index(resource_size_t base_addr)
return -ENODEV;
}
-static int fintek_8250_check_id(void)
+static int fintek_8250_check_id(u16 base_port)
{
- outb(CHIP_ID1, ADDR_PORT);
- if (inb(DATA_PORT) != CHIP_ID1_VAL)
+ outb(CHIP_ID1, base_port + ADDR_PORT);
+ if (inb(base_port + DATA_PORT) != CHIP_ID1_VAL)
return -ENODEV;
- outb(CHIP_ID2, ADDR_PORT);
- if (inb(DATA_PORT) != CHIP_ID2_VAL)
+ outb(CHIP_ID2, base_port + ADDR_PORT);
+ if (inb(base_port + DATA_PORT) != CHIP_ID2_VAL)
return -ENODEV;
- outb(VENDOR_ID1, ADDR_PORT);
- if (inb(DATA_PORT) != VENDOR_ID1_VAL)
+ outb(VENDOR_ID1, base_port + ADDR_PORT);
+ if (inb(base_port + DATA_PORT) != VENDOR_ID1_VAL)
return -ENODEV;
- outb(VENDOR_ID2, ADDR_PORT);
- if (inb(DATA_PORT) != VENDOR_ID2_VAL)
+ outb(VENDOR_ID2, base_port + ADDR_PORT);
+ if (inb(base_port + DATA_PORT) != VENDOR_ID2_VAL)
return -ENODEV;
return 0;
@@ -130,45 +133,58 @@ static int fintek_8250_rs485_config(struct uart_port *port,
if (rs485->flags & SER_RS485_RTS_ON_SEND)
config |= RTS_INVERT;
- if (fintek_8250_enter_key())
+ if (fintek_8250_enter_key(pdata->base_port))
return -EBUSY;
- outb(LDN, ADDR_PORT);
- outb(pdata->index, DATA_PORT);
- outb(RS485, ADDR_PORT);
- outb(config, DATA_PORT);
- fintek_8250_exit_key();
+ outb(LDN, pdata->base_port + ADDR_PORT);
+ outb(pdata->index, pdata->base_port + DATA_PORT);
+ outb(RS485, pdata->base_port + ADDR_PORT);
+ outb(config, pdata->base_port + DATA_PORT);
+ fintek_8250_exit_key(pdata->base_port);
port->rs485 = *rs485;
return 0;
}
+static int fintek_8250_base_port(void)
+{
+ u16 addr[] = {0x4e, 0x2e};
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(addr); i++) {
+ int ret;
+
+ if (fintek_8250_enter_key(addr[i]))
+ continue;
+ ret = fintek_8250_check_id(addr[i]);
+ fintek_8250_exit_key(addr[i]);
+ if (!ret)
+ return addr[i];
+ }
+
+ return -ENODEV;
+}
+
static int
fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
{
struct uart_8250_port uart;
struct fintek_8250 *pdata;
- int ret;
int index;
+ int base_port;
if (!pnp_port_valid(dev, 0))
return -ENODEV;
+ base_port = fintek_8250_base_port();
+ if (base_port < 0)
+ return -ENODEV;
+
index = fintek_8250_get_index(pnp_port_start(dev, 0));
if (index < 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;
-
pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
@@ -189,6 +205,7 @@ fintek_8250_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
uart.port.uartclk = 1843200;
uart.port.dev = &dev->dev;
+ pdata->base_port = base_port;
pdata->index = index;
pdata->line = serial8250_register_8250_port(&uart);
if (pdata->line < 0)
--
2.1.4
--
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