[PATCH 2/2]: Serial 8250 OMAP support
From: Tony Lindgren
Date: Mon Aug 16 2004 - 08:11:06 EST
Following patch adds OMAP support to the 8250 serial driver.
diff -Nru a/drivers/serial/8250.c b/drivers/serial/8250.c
--- a/drivers/serial/8250.c 2004-08-16 05:15:36 -07:00
+++ b/drivers/serial/8250.c 2004-08-16 05:15:36 -07:00
@@ -173,6 +173,7 @@
{ "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "NS16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO | UART_NATSEMI },
{ "XScale", 32, UART_CLEAR_FIFO | UART_USE_FIFO },
+ { "OMAP UART", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH }
};
static _INLINE_ unsigned int serial_in(struct uart_8250_port *up, int offset)
@@ -1215,6 +1216,28 @@
serial_outp(up, UART_LCR, 0);
}
+#ifdef CONFIG_ARCH_OMAP
+ if (up->port.type == PORT_OMAP) {
+ serial_outp(up, UART_OMAP_MDR1, 0x07); /* disable UART */
+ serial_outp(up, UART_LCR, 0xBF); /* select EFR */
+ serial_outp(up, UART_EFR, UART_EFR_ECB);
+ serial_outp(up, UART_LCR, UART_LCR_DLAB); /* set DLAB */
+ serial_outp(up, UART_DLL, 0x00);
+ serial_outp(up, UART_DLM, 0x00);
+ serial_outp(up, UART_LCR, 0x00); /* reset DLAB */
+ serial_outp(up, UART_OMAP_SCR, 0x08);
+ serial_outp(up, UART_FCR, 0x00);
+ serial_outp(up, UART_MCR, 0x40); /* enable TCR/TLR */
+ serial_outp(up, UART_OMAP_TCR, 0x0F);
+ serial_outp(up, UART_OMAP_TLR, 0x00);
+ serial_outp(up, UART_MCR, 0x00);
+ serial_outp(up, UART_LCR, 0xBF); /* select EFR */
+ serial_outp(up, UART_EFR, 0x00);
+ serial_outp(up, UART_LCR, 0x00); /* reset DLAB */
+ serial_outp(up, UART_OMAP_MDR1, 0x00); /* enable UART */
+ }
+#endif
+
#ifdef CONFIG_SERIAL_8250_RSA
/*
* If this is an RSA port, see if we can kick it up to the
@@ -1447,6 +1470,10 @@
else if (up->port.type == PORT_RSA)
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
+#ifdef CONFIG_ARCH_OMAP
+ else if (up->port.type == PORT_OMAP)
+ fcr = UART_FCR_T_TRIGGER_56 | UART_FCR_R_TRIGGER_60 | UART_FCR_ENABLE_FIFO;
+#endif
else
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
}
@@ -1519,6 +1546,16 @@
serial_outp(up, UART_EFR,
termios->c_cflag & CRTSCTS ? UART_EFR_CTS :0);
}
+
+#ifdef CONFIG_ARCH_OMAP1510 /* Needed for 1510 only */
+ if (up->port.type == PORT_OMAP && cpu_is_omap1510()) {
+ if (baud == 115200) {
+ quot = 1;
+ serial_out(up, UART_OMAP_OSC_12M_SEL, 1);
+ } else
+ serial_out(up, UART_OMAP_OSC_12M_SEL, 0);
+ }
+#endif
if (up->capabilities & UART_NATSEMI) {
/* Switch to bank 2 not bank 1, to avoid resetting EXCR2 */
diff -Nru a/drivers/serial/8250_omap.c b/drivers/serial/8250_omap.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/drivers/serial/8250_omap.c 2004-08-16 05:15:36 -07:00
@@ -0,0 +1,125 @@
+/*
+ * linux/drivers/serial/8250_omap.c
+ * Partially copied from 8250_acorn.c
+ *
+ * Copyright (C) 1996-2003 Russell King.
+ * Copyright (C) 2004 Nokia Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/tty.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/arch/serial.h>
+#include <asm/string.h>
+
+#define UART_SYSC 0x15
+
+#define MAX_PORTS 3
+
+struct omap_serial_port {
+ unsigned long baddr;
+ unsigned int irq;
+};
+
+static const struct omap_serial_port omap1510_serial_ports[] = {
+ { .baddr = (unsigned long)IO_ADDRESS(OMAP_UART1_BASE), .irq = INT_UART1 },
+ { .baddr = (unsigned long)IO_ADDRESS(OMAP_UART2_BASE), .irq = INT_UART2 },
+ { .baddr = (unsigned long)IO_ADDRESS(OMAP_UART3_BASE), .irq = INT_UART3 },
+};
+
+static const struct omap_serial_port omap730_serial_ports[] = {
+ { .baddr = (unsigned long)IO_ADDRESS(OMAP_UART1_BASE), .irq = INT_730_UART_MODEM_1 },
+ { .baddr = (unsigned long)IO_ADDRESS(OMAP_UART2_BASE), .irq = INT_730_UART_MODEM_IRDA_2 },
+};
+
+static void
+reset_port(struct serial_struct *port)
+{
+ if (cpu_is_omap1510())
+ return;
+ writeb(0x01, port->iomap_base + (UART_SYSC << port->iomem_reg_shift));
+ while (!(readb(port->iomap_base + (UART_SYSC << port->iomem_reg_shift)) & 0x01));
+}
+
+static inline int
+serial_register_onedev(const struct omap_serial_port *port)
+{
+ struct serial_struct req;
+
+ memset(&req, 0, sizeof(req));
+ req.type = PORT_OMAP;
+ req.irq = port->irq;
+ req.flags = UPF_SKIP_TEST;
+ req.io_type = UPIO_MEM;
+ req.iomem_base = (unsigned char *) port->baddr;
+ req.iomap_base = port->baddr;
+
+ if (cpu_is_omap1510()) {
+ req.baud_base = OMAP1510_BASE_BAUD;
+ req.iomem_reg_shift = 2;
+ }
+ if (cpu_is_omap1610() || cpu_is_omap5912() || cpu_is_omap1710()) {
+ req.baud_base = OMAP1610_BASE_BAUD;
+ req.iomem_reg_shift = 2;
+ }
+ if (cpu_is_omap730()) {
+ req.baud_base = OMAP1610_BASE_BAUD;
+ req.iomem_reg_shift = 0;
+ }
+
+ reset_port(&req);
+
+ return register_serial(&req);
+}
+
+static int port_count = 0;
+static int ports[MAX_PORTS];
+
+static int __init omap_serial_init(void)
+{
+ int i;
+ const struct omap_serial_port *port_table = NULL;
+
+ if (cpu_is_omap1510() || cpu_is_omap1610() || cpu_is_omap5912()
+ || cpu_is_omap1710()) {
+ port_count = 3;
+ port_table = omap1510_serial_ports;
+ }
+ if (cpu_is_omap730()) {
+ port_count = 2;
+ port_table = omap730_serial_ports;
+ }
+ for (i = 0; i < port_count; i++) {
+ ports[i] = serial_register_onedev(&port_table[i]);
+ }
+ printk(KERN_INFO "OMAP serial: activated %d ports\n", i);
+
+ return 0;
+}
+
+static void __exit omap_serial_exit(void)
+{
+ int i;
+
+ for (i = 0; i < port_count; i++)
+ unregister_serial(ports[i]);
+}
+
+MODULE_AUTHOR("Juha Yrjölä");
+MODULE_DESCRIPTION("OMAP 8250-compatible serial port driver");
+MODULE_LICENSE("GPL");
+
+module_init(omap_serial_init);
+module_exit(omap_serial_exit);
diff -Nru a/drivers/serial/Kconfig b/drivers/serial/Kconfig
--- a/drivers/serial/Kconfig 2004-08-16 05:15:36 -07:00
+++ b/drivers/serial/Kconfig 2004-08-16 05:15:36 -07:00
@@ -166,6 +166,13 @@
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
+config SERIAL_8250_OMAP
+ tristate "OMAP serial port support"
+ depends on ARM && ARCH_OMAP && SERIAL_8250
+ help
+ Say Y or M here if you want to use the integrated UARTs of the TI
+ OMAP multimedia processor.
+
config SERIAL_AMBA_PL010
tristate "ARM AMBA PL010 serial port support"
depends on ARM_AMBA
diff -Nru a/drivers/serial/Makefile b/drivers/serial/Makefile
--- a/drivers/serial/Makefile 2004-08-16 05:15:36 -07:00
+++ b/drivers/serial/Makefile 2004-08-16 05:15:36 -07:00
@@ -15,6 +15,7 @@
obj-$(CONFIG_SERIAL_8250) += 8250.o $(serial-8250-y)
obj-$(CONFIG_SERIAL_8250_CS) += serial_cs.o
obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o
+obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o
obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
diff -Nru a/include/linux/serial_core.h b/include/linux/serial_core.h
--- a/include/linux/serial_core.h 2004-08-16 05:15:36 -07:00
+++ b/include/linux/serial_core.h 2004-08-16 05:15:36 -07:00
@@ -37,7 +37,8 @@
#define PORT_RSA 13
#define PORT_NS16550A 14
#define PORT_XSCALE 15
-#define PORT_MAX_8250 15 /* max port ID */
+#define PORT_OMAP 16
+#define PORT_MAX_8250 16 /* max port ID */
/*
* ARM specific type numbers. These are not currently guaranteed
diff -Nru a/include/linux/serial_reg.h b/include/linux/serial_reg.h
--- a/include/linux/serial_reg.h 2004-08-16 05:15:36 -07:00
+++ b/include/linux/serial_reg.h 2004-08-16 05:15:36 -07:00
@@ -294,5 +294,21 @@
#define SERIAL_RSA_BAUD_BASE (921600)
#define SERIAL_RSA_BAUD_BASE_LO (SERIAL_RSA_BAUD_BASE / 8)
+/*
+ * Extra serial register definitions for the internal UARTs
+ * in TI OMAP processors.
+ */
+#define UART_OMAP_TCR 0x06 /* Transmission control register */
+#define UART_OMAP_TLR 0x07 /* Trigger level register */
+#define UART_OMAP_MDR1 0x08 /* Mode definition register */
+#define UART_OMAP_MDR2 0x09 /* Mode definition register 2 */
+#define UART_OMAP_SCR 0x10 /* Supplementary control register */
+#define UART_OMAP_SSR 0x11 /* Supplementary status register */
+#define UART_OMAP_EBLR 0x12 /* BOF length register */
+#define UART_OMAP_OSC_12M_SEL 0x13 /* OMAP1510 12MHz osc select */
+#define UART_OMAP_MVER 0x14 /* Module version register */
+#define UART_OMAP_SYSC 0x15 /* System configuration register */
+#define UART_OMAP_SYSS 0x16 /* System status register */
+
#endif /* _LINUX_SERIAL_REG_H */