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RS485 auto mode support ported from 2.4 (diff against 2.6.19-rc6-git10)
Signed-off-by: Petr Stetiar <ynezz@true.cz>
Index: linux-2.6.24/drivers/serial/amba-pl010.c
===================================================================
--- linux-2.6.24.orig/drivers/serial/amba-pl010.c 2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24/drivers/serial/amba-pl010.c 2010-02-07 18:17:40.000000000 +0100
@@ -51,6 +51,7 @@
#include <linux/clk.h>
#include <asm/io.h>
+#include <asm/hardware.h>
#define UART_NR 8
@@ -66,6 +67,16 @@
#define UART_DUMMY_RSR_RX 256
#define UART_PORT_SIZE 64
+#ifdef CONFIG_MACH_TS72XX
+static void __iomem *ts_rs485_data9_register;
+static void __iomem *ts_rs485_control_register;
+#endif
+
+#ifdef CONFIG_MACH_TS72XX
+static void __iomem *ts_rs485_data9_register;
+static void __iomem *ts_rs485_control_register;
+#endif
+
/*
* We wrap our port structure around the generic uart_port.
*/
@@ -521,6 +532,107 @@
return ret;
}
+#ifdef CONFIG_MACH_TS72XX
+static int ts72xx_rs485_init(void)
+{
+ ts_rs485_data9_register = ioremap(TS72XX_RS485_DATA9_PHYS_BASE, 4096);
+ if (ts_rs485_data9_register == NULL) {
+ return -1;
+ }
+
+ ts_rs485_control_register = ioremap(TS72XX_RS485_CONTROL_PHYS_BASE, 4096);
+ if (ts_rs485_control_register == NULL) {
+ iounmap(ts_rs485_data9_register);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int ts72xx_auto485(struct uart_port *port, unsigned int cmd, unsigned long *arg)
+{
+ int baud, cflag, mode;
+ int datalength;
+
+ mode = (int)*arg;
+ if (!is_rs485_installed()) {
+ printk("amba-pl010.c: this board does not support RS485 auto mode\n");
+ return -EINVAL;
+ }
+
+ if (port->line != 1) {
+ printk("amba-pl010.c: auto RS485 mode is only supported on second port (/dev/ttyAM1)\n");
+ return -EINVAL;
+ }
+
+ datalength = 8;
+ cflag = port->info->tty->termios->c_cflag ;
+ if (cflag & PARENB)
+ datalength++;
+
+ if (cflag & CSTOPB)
+ datalength++;
+
+ baud = tty_get_baud_rate(port->info->tty);
+
+ switch (cmd) {
+ case TIOC_SBCC485:
+ if ((mode & TS72XX_RS485_AUTO485FD) || (mode & TS72XX_RS485_AUTO485HD)) {
+ printk("amba-pl010.c: unsetting auto RS485 mode\n");
+ __raw_writew(TS72XX_RS485_MODE_RS232, ts_rs485_control_register);
+ __raw_writew(TS72XX_RS485_MODE_RS232, ts_rs485_data9_register);
+ }
+ break;
+ case TIOC_SBCS485:
+ if (mode & TS72XX_RS485_AUTO485FD) {
+ printk ("amba-pl010.c: setting FULL duplex auto RS485 mode\n");
+ __raw_writew(TS72XX_RS485_MODE_FD, ts_rs485_control_register);
+ if (datalength > 8)
+ __raw_writew(TS72XX_RS485_MODE_FD, ts_rs485_data9_register);
+ } else if (mode & TS72XX_RS485_AUTO485HD) {
+ printk("amba-pl010.c: setting HALF DUPLEX auto RS485 mode\n");
+ switch (baud) {
+ case 9600:
+ __raw_writew(TS72XX_RS485_MODE_9600_HD, ts_rs485_control_register);
+ break;
+ case 19200:
+ __raw_writew(TS72XX_RS485_MODE_19200_HD, ts_rs485_control_register);
+ break;
+ case 57600:
+ __raw_writew(TS72XX_RS485_MODE_57600_HD, ts_rs485_control_register);
+ break;
+ case 115200:
+ __raw_writew(TS72XX_RS485_MODE_115200_HD, ts_rs485_control_register);
+ break;
+ default:
+ printk("amba-pl010.c: %d baud rate is not supported for auto RS485 mode\n", baud);
+ return -1;
+ }
+ if (datalength > 8)
+ __raw_writew(TS72XX_RS485_MODE_FD, ts_rs485_data9_register);
+ }
+ break;
+ }
+
+ return 0;
+}
+#endif
+
+int pl010_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
+{
+#ifdef CONFIG_MACH_TS72XX
+ switch (cmd) {
+ case TIOC_SBCC485:
+ case TIOC_SBCS485:
+ return ts72xx_auto485(port, cmd, (unsigned long *)arg);
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+#endif
+ return -ENOIOCTLCMD;
+}
+
static struct uart_ops amba_pl010_pops = {
.tx_empty = pl010_tx_empty,
.set_mctrl = pl010_set_mctrl,
@@ -538,6 +650,7 @@
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
+ .ioctl = pl010_ioctl,
};
static struct uart_amba_port *amba_ports[UART_NR];
@@ -796,6 +909,15 @@
ret = uart_register_driver(&amba_reg);
if (ret == 0) {
ret = amba_driver_register(&pl010_driver);
+#ifdef CONFIG_MACH_TS72XX
+ if (!ret && is_rs485_installed()) {
+ ret = ts72xx_rs485_init();
+ if (ret)
+ printk("amba-pl010.c: ts72xx_rs485_init() failed\n");
+ else
+ printk("amba-pl010.c: auto RS485 mode initialized\n");
+ }
+#endif
if (ret)
uart_unregister_driver(&amba_reg);
}
@@ -806,6 +928,10 @@
{
amba_driver_unregister(&pl010_driver);
uart_unregister_driver(&amba_reg);
+#ifdef CONFIG_MACH_TS72XX
+ iounmap(ts_rs485_data9_register);
+ iounmap(ts_rs485_control_register);
+#endif
}
module_init(pl010_init);
Index: linux-2.6.24/include/asm-arm/arch-ep93xx/ts72xx.h
===================================================================
--- linux-2.6.24.orig/include/asm-arm/arch-ep93xx/ts72xx.h 2010-02-07 18:03:02.000000000 +0100
+++ linux-2.6.24/include/asm-arm/arch-ep93xx/ts72xx.h 2010-02-07 18:03:02.000000000 +0100
@@ -59,6 +59,16 @@
#define TS72XX_NAND_BUSY_VIRT_BASE 0xfebfa000
#define TS72XX_NAND_BUSY_SIZE 0x00001000
+#define TS72XX_RS485_CONTROL_PHYS_BASE 0x22C00000
+#define TS72XX_RS485_DATA9_PHYS_BASE 0x23000000
+#define TS72XX_RS485_AUTO485FD 1
+#define TS72XX_RS485_AUTO485HD 2
+#define TS72XX_RS485_MODE_RS232 0x00
+#define TS72XX_RS485_MODE_FD 0x01
+#define TS72XX_RS485_MODE_9600_HD 0x04
+#define TS72XX_RS485_MODE_19200_HD 0x05
+#define TS72XX_RS485_MODE_57600_HD 0x06
+#define TS72XX_RS485_MODE_115200_HD 0x07
#define TS72XX_RTC_INDEX_VIRT_BASE 0xfebf9000
#define TS72XX_RTC_INDEX_PHYS_BASE 0x10800000
@@ -68,6 +78,16 @@
#define TS72XX_RTC_DATA_PHYS_BASE 0x11700000
#define TS72XX_RTC_DATA_SIZE 0x00001000
+#define TS72XX_RS485_CONTROL_PHYS_BASE 0x22C00000
+#define TS72XX_RS485_DATA9_PHYS_BASE 0x23000000
+#define TS72XX_RS485_AUTO485FD 1
+#define TS72XX_RS485_AUTO485HD 2
+#define TS72XX_RS485_MODE_RS232 0x00
+#define TS72XX_RS485_MODE_FD 0x01
+#define TS72XX_RS485_MODE_9600_HD 0x04
+#define TS72XX_RS485_MODE_19200_HD 0x05
+#define TS72XX_RS485_MODE_57600_HD 0x06
+#define TS72XX_RS485_MODE_115200_HD 0x07
#define TS72XX_WATCHDOG_CONTROL_PHYS_BASE 0x23800000
#define TS72XX_WATCHDOG_FEED_PHYS_BASE 0x23c00000
@@ -90,6 +110,12 @@
return __raw_readb(TS72XX_MODEL_VIRT_BASE) == TS72XX_MODEL_TS7260;
}
+static inline int is_rs485_installed(void)
+{
+ return !!(__raw_readb(TS72XX_OPTIONS_VIRT_BASE) &
+ TS72XX_OPTIONS_COM2_RS485);
+}
+
static inline int is_max197_installed(void)
{
return !!(__raw_readb(TS72XX_OPTIONS_VIRT_BASE) &
Index: linux-2.6.24/include/asm-arm/ioctls.h
===================================================================
--- linux-2.6.24.orig/include/asm-arm/ioctls.h 2008-01-24 23:58:37.000000000 +0100
+++ linux-2.6.24/include/asm-arm/ioctls.h 2010-02-07 18:03:02.000000000 +0100
@@ -70,6 +70,12 @@
#define TIOCGICOUNT 0x545D /* read serial port inline interrupt counts */
#define FIOQSIZE 0x545E
+#define TIOC_SBCC485 0x545F /* TS72xx RTS/485 mode clear */
+#define TIOC_SBCS485 0x5460 /* TS72xx RTS/485 mode set */
+
+#define TIOC_SBCC485 0x545F /* TS72xx RTS/485 mode clear */
+#define TIOC_SBCS485 0x5460 /* TS72xx RTS/485 mode set */
+
/* Used for packet mode */
#define TIOCPKT_DATA 0
#define TIOCPKT_FLUSHREAD 1
|
