Serial driver for OMAP Uart controllers
Signed-off-by: Girish S G <girishsg@xxxxxx>
---
arch/arm/configs/omap_3430sdp_defconfig | 12
arch/arm/mach-omap2/serial.c | 166 ++---
drivers/serial/Kconfig | 23
drivers/serial/Makefile | 1
drivers/serial/omap-serial.c | 887 ++++++++++++++++++++++++++++++++
include/linux/serial_core.h | 3
6 files changed, 974 insertions(+), 118 deletions(-)
Index: linux-omap-2.6/arch/arm/configs/omap_3430sdp_defconfig
===================================================================
--- linux-omap-2.6.orig/arch/arm/configs/omap_3430sdp_defconfig 2008-07-31
11:15:29.000000000 +0530
+++ linux-omap-2.6/arch/arm/configs/omap_3430sdp_defconfig 2008-07-31
11:25:24.000000000 +0530
@@ -683,19 +683,13 @@
#
# Serial drivers
#
-CONFIG_SERIAL_8250=y
-CONFIG_SERIAL_8250_CONSOLE=y
-CONFIG_SERIAL_8250_NR_UARTS=32
-CONFIG_SERIAL_8250_RUNTIME_UARTS=4
-CONFIG_SERIAL_8250_EXTENDED=y
-CONFIG_SERIAL_8250_MANY_PORTS=y
-CONFIG_SERIAL_8250_SHARE_IRQ=y
-CONFIG_SERIAL_8250_DETECT_IRQ=y
-CONFIG_SERIAL_8250_RSA=y
+# CONFIG_SERIAL_8250 is not set
#
# Non-8250 serial port support
#
+CONFIG_SERIAL_OMAP=y
+CONFIG_SERIAL_OMAP_CONSOLE=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_UNIX98_PTYS=y
Index: linux-omap-2.6/arch/arm/mach-omap2/serial.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/serial.c 2008-07-31
11:15:29.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/serial.c 2008-07-31 16:33:53.000000000
+0530
@@ -14,94 +14,75 @@
*/
#include <linux/kernel.h>
#include <linux/init.h>
-#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
+#include <linux/platform_device.h>
+#include <linux/serial.h>
#include <linux/clk.h>
#include <linux/io.h>
-#include <asm/arch/common.h>
#include <asm/arch/board.h>
-static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
-static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
-
-static struct plat_serial8250_port serial_platform_data[] = {
+static struct resource omap2_uart1_resources[] = {
{
- .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART1_BASE),
- .mapbase = (unsigned long)OMAP_UART1_BASE,
- .irq = 72,
- .flags = UPF_BOOT_AUTOCONF,
- .iotype = UPIO_MEM,
- .regshift = 2,
- .uartclk = OMAP24XX_BASE_BAUD * 16,
- }, {
- .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART2_BASE),
- .mapbase = (unsigned long)OMAP_UART2_BASE,
- .irq = 73,
- .flags = UPF_BOOT_AUTOCONF,
- .iotype = UPIO_MEM,
- .regshift = 2,
- .uartclk = OMAP24XX_BASE_BAUD * 16,
- }, {
- .membase = (__force void __iomem *)IO_ADDRESS(OMAP_UART3_BASE),
- .mapbase = (unsigned long)OMAP_UART3_BASE,
- .irq = 74,
- .flags = UPF_BOOT_AUTOCONF,
- .iotype = UPIO_MEM,
- .regshift = 2,
- .uartclk = OMAP24XX_BASE_BAUD * 16,
+ .start = OMAP_UART1_BASE,
+ .end = OMAP_UART1_BASE + 0x3ff,
+ .flags = IORESOURCE_MEM,
}, {
- .flags = 0
+ .start = 72,
+ .flags = IORESOURCE_IRQ,
}
};
-static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
- int offset)
-{
- offset <<= up->regshift;
- return (unsigned int)__raw_readb(up->membase + offset);
-}
-
-static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
- int value)
-{
- offset <<= p->regshift;
- __raw_writeb(value, p->membase + offset);
-}
-
-/*
- * Internal UARTs need to be initialized for the 8250 autoconfig to work
- * properly. Note that the TX watermark initialization may not be needed
- * once the 8250.c watermark handling code is merged.
- */
-static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
-{
- serial_write_reg(p, UART_OMAP_MDR1, 0x07);
- serial_write_reg(p, UART_OMAP_SCR, 0x08);
- serial_write_reg(p, UART_OMAP_MDR1, 0x00);
- serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
-}
+static struct resource omap2_uart2_resources[] = {
+ {
+ .start = OMAP_UART2_BASE,
+ .end = OMAP_UART2_BASE + 0x3ff,
+ .flags = IORESOURCE_MEM,
+ }, {
+ .start = 73,
+ .flags = IORESOURCE_IRQ,
+ }
+};
-void omap_serial_enable_clocks(int enable)
-{
- int i;
- for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
- if (uart_ick[i] && uart_fck[i]) {
- if (enable) {
- clk_enable(uart_ick[i]);
- clk_enable(uart_fck[i]);
- } else {
- clk_disable(uart_ick[i]);
- clk_disable(uart_fck[i]);
- }
- }
+static struct resource omap2_uart3_resources[] = {
+ {
+ .start = OMAP_UART3_BASE,
+ .end = OMAP_UART3_BASE + 0x3ff,
+ .flags = IORESOURCE_MEM,
+ }, {
+ .start = 74,
+ .flags = IORESOURCE_IRQ,
}
-}
+};
+static struct platform_device uart1_device = {
+ .name = "omap-uart",
+ .id = 1,
+ .num_resources = ARRAY_SIZE(omap2_uart1_resources),
+ .resource = omap2_uart1_resources,
+};
+static struct platform_device uart2_device = {
+ .name = "omap-uart",
+ .id = 2,
+ .num_resources = ARRAY_SIZE(omap2_uart2_resources),
+ .resource = omap2_uart2_resources,
+};
+static struct platform_device uart3_device = {
+ .name = "omap-uart",
+ .id = 3,
+ .num_resources = ARRAY_SIZE(omap2_uart3_resources),
+ .resource = omap2_uart3_resources,
+};
+
+static struct platform_device *uart_devices[] = {
+ &uart1_device,
+ &uart2_device,
+ &uart3_device
+};
void __init omap_serial_init(void)
{
- int i;
+ int i, r;
const struct omap_uart_config *info;
char name[16];
@@ -116,45 +97,12 @@
if (info == NULL)
return;
- for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
- struct plat_serial8250_port *p = serial_platform_data + i;
-
- if (!(info->enabled_uarts & (1 << i))) {
- p->membase = NULL;
- p->mapbase = 0;
+ for (i = 0; i < ARRAY_SIZE(uart_devices); i++) {
+ if (!(info->enabled_uarts & (1 << i)))
continue;
- }
-
- sprintf(name, "uart%d_ick", i+1);
- uart_ick[i] = clk_get(NULL, name);
- if (IS_ERR(uart_ick[i])) {
- printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
- uart_ick[i] = NULL;
- } else
- clk_enable(uart_ick[i]);
-
- sprintf(name, "uart%d_fck", i+1);
- uart_fck[i] = clk_get(NULL, name);
- if (IS_ERR(uart_fck[i])) {
- printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
- uart_fck[i] = NULL;
- } else
- clk_enable(uart_fck[i]);
-
- omap_serial_reset(p);
+ r = platform_device_register(uart_devices[i]);
+ if (r < 0)
+ printk(KERN_ERR "Failed to register UART%d\n", i + 1);
}
-}
-
-static struct platform_device serial_device = {
- .name = "serial8250",
- .id = PLAT8250_DEV_PLATFORM,
- .dev = {
- .platform_data = serial_platform_data,
- },
-};
-static int __init omap_init(void)
-{
- return platform_device_register(&serial_device);
}
-arch_initcall(omap_init);
Index: linux-omap-2.6/drivers/serial/Kconfig
===================================================================
--- linux-omap-2.6.orig/drivers/serial/Kconfig 2008-07-31 11:16:07.000000000 +0530
+++ linux-omap-2.6/drivers/serial/Kconfig 2008-07-31 11:25:24.000000000 +0530
@@ -592,6 +592,29 @@
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
+config SERIAL_OMAP
+ bool "OMAP serial port support"
+ depends on ARM && ARCH_OMAP
+ select SERIAL_CORE
+ help
+ If you have a machine based on an Texas Instruments OMAP CPU you
+ can enable its onboard serial ports by enabling this option.
+
+config SERIAL_OMAP_CONSOLE
+ bool "Console on OMAP serial port"
+ depends on SERIAL_OMAP
+ select SERIAL_CORE_CONSOLE
+ help
+ If you have enabled the serial port on the Texas Instruments OMAP
+ CPU you can make it the console by answering Y to this option.
+
+ Even if you say Y here, the currently visible virtual console
+ (/dev/tty0) will still be used as the system console by default, but
+ you can alter that using a kernel command line option such as
+ "console=ttyS0". (Try "man bootparam" or see the documentation of
+ your boot loader (lilo or loadlin) about how to pass options to the
+ kernel at boot time.)
+
config SERIAL_SA1100
bool "SA1100 serial port support"
depends on ARM && ARCH_SA1100
Index: linux-omap-2.6/drivers/serial/Makefile
===================================================================
--- linux-omap-2.6.orig/drivers/serial/Makefile 2008-07-31 11:16:07.000000000
+0530
+++ linux-omap-2.6/drivers/serial/Makefile 2008-07-31 11:25:24.000000000 +0530
@@ -24,6 +24,7 @@
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
obj-$(CONFIG_SERIAL_PXA) += pxa.o
+obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
obj-$(CONFIG_SERIAL_BFIN) += bfin_5xx.o
Index: linux-omap-2.6/drivers/serial/omap-serial.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-omap-2.6/drivers/serial/omap-serial.c 2008-07-31 16:34:16.000000000
+0530
@@ -0,0 +1,887 @@
+/*
+ * linux/drivers/serial/omap-serial.c
+ *
+ *
+ * Modified: Girish S G
+ * Copyright (C) 2008 Texas Instrument Inc.
+ *
+ * Initial driver: Juha Yrjola
+ * Copyright (C) 2007 Nokia Corporation
+ *
+ * Based on drivers/serial/pxa.c by Nicolas Pitre.
+ * Copyright (C) 2003 Monta Vista Software, Inc.
+ *
+ * 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, or
+ * (at your option) any later version.
+ *
+ */
+
+#if defined(CONFIG_SERIAL_OMAP_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
+#define SUPPORT_SYSRQ
+#endif
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/sysrq.h>
+#include <linux/serial_reg.h>
+#include <linux/circ_buf.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial_core.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+
+struct uart_omap_port {
+ struct uart_port port;
+ int shift;
+ struct clk *iclk, *fclk;
+
+ struct platform_device *pdev;
+
+ unsigned char ier;
+ unsigned char lcr;
+ unsigned char mcr;
+ unsigned int lsr_break_flag;
+ char name[12];
+};
+
+static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
+{
+ offset <<= up->shift;
+ return readb(up->port.membase + offset);
+}
+
+static inline void serial_out(struct uart_omap_port *up, int offset, int value)
+{
+ offset <<= up->shift;
+ writeb(value, up->port.membase + offset);
+}
+
+static void enable_uart_clocks(struct uart_omap_port *up)
+{
+ clk_enable(up->fclk);
+ if (up->iclk != NULL)
+ clk_enable(up->iclk);
+}
+
+static void disable_uart_clocks(struct uart_omap_port *up)
+{
+ clk_disable(up->fclk);
+ if (up->iclk != NULL)
+ clk_disable(up->iclk);
+}
+
+static void serial_omap_enable_ms(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+ up->ier |= UART_IER_MSI;
+ serial_out(up, UART_IER, up->ier);
+}
+
+static void serial_omap_stop_tx(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+ if (up->ier & UART_IER_THRI) {
+ up->ier &= ~UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ }
+}
+
+static void serial_omap_stop_rx(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+ up->ier &= ~UART_IER_RLSI;
+ up->port.read_status_mask &= ~UART_LSR_DR;
+ serial_out(up, UART_IER, up->ier);
+}
+
+static inline void receive_chars(struct uart_omap_port *up, int *status)
+{
+ struct tty_struct *tty = up->port.info->tty;
+ unsigned int ch, flag;
+ int max_count = 256;
+
+ do {
+ ch = serial_in(up, UART_RX);
+ flag = TTY_NORMAL;
+ up->port.icount.rx++;
+
+ if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+ UART_LSR_FE | UART_LSR_OE))) {
+ /*
+ * For statistics only
+ */
+ if (*status & UART_LSR_BI) {
+ *status &= ~(UART_LSR_FE | UART_LSR_PE);
+ up->port.icount.brk++;
+ /*
+ * We do the SysRQ and SAK checking
+ * here because otherwise the break
+ * may get masked by ignore_status_mask
+ * or read_status_mask.
+ */
+ if (uart_handle_break(&up->port))
+ goto ignore_char;
+ } else if (*status & UART_LSR_PE)
+ up->port.icount.parity++;
+ else if (*status & UART_LSR_FE)
+ up->port.icount.frame++;
+ if (*status & UART_LSR_OE)
+ up->port.icount.overrun++;
+
+ /*
+ * Mask off conditions which should be ignored.
+ */
+ *status &= up->port.read_status_mask;
+
+#ifdef CONFIG_SERIAL_OMAP_CONSOLE
+ if (up->port.line == up->port.cons->index) {
+ /* Recover the break flag from console xmit */
+ *status |= up->lsr_break_flag;
+ up->lsr_break_flag = 0;
+ }
+#endif
+ if (*status & UART_LSR_BI)
+ flag = TTY_BREAK;
+ else if (*status & UART_LSR_PE)
+ flag = TTY_PARITY;
+ else if (*status & UART_LSR_FE)
+ flag = TTY_FRAME;
+ }
+
+ if (uart_handle_sysrq_char(&up->port, ch))
+ goto ignore_char;
+
+ uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
+
+ignore_char:
+ *status = serial_in(up, UART_LSR);
+ } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+ tty_flip_buffer_push(tty);
+}
+
+static void transmit_chars(struct uart_omap_port *up)
+{
+ struct circ_buf *xmit = &up->port.info->xmit;
+ int count;
+
+ if (up->port.x_char) {
+ serial_out(up, UART_TX, up->port.x_char);
+ up->port.icount.tx++;
+ up->port.x_char = 0;
+ return;
+ }
+ if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
+ serial_omap_stop_tx(&up->port);
+ return;
+ }
+
+ count = 16;
+ do {
+ serial_out(up, UART_TX, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ up->port.icount.tx++;
+ if (uart_circ_empty(xmit))
+ break;
+ } while (--count > 0);
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(&up->port);
+
+ if (uart_circ_empty(xmit))
+ serial_omap_stop_tx(&up->port);
+}
+
+static void serial_omap_start_tx(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+ if (!(up->ier & UART_IER_THRI)) {
+ up->ier |= UART_IER_THRI;
+ serial_out(up, UART_IER, up->ier);
+ }
+}
+
+static inline void check_modem_status(struct uart_omap_port *up)
+{
+ int status;
+
+ status = serial_in(up, UART_MSR);
+
+ if ((status & UART_MSR_ANY_DELTA) == 0)
+ return;
+
+ if (status & UART_MSR_TERI)
+ up->port.icount.rng++;
+ if (status & UART_MSR_DDSR)
+ up->port.icount.dsr++;
+ if (status & UART_MSR_DDCD)
+ uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
+ if (status & UART_MSR_DCTS)
+ uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
+
+ wake_up_interruptible(&up->port.info->delta_msr_wait);
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static inline irqreturn_t serial_omap_irq(int irq, void *dev_id)
+{
+ struct uart_omap_port *up = dev_id;
+ unsigned int iir, lsr;
+
+ iir = serial_in(up, UART_IIR);
+ if (iir & UART_IIR_NO_INT)
+ return IRQ_NONE;
+ lsr = serial_in(up, UART_LSR);
+ if (lsr & UART_LSR_DR)
+ receive_chars(up, &lsr);
+ check_modem_status(up);
+ if (lsr & UART_LSR_THRE)
+ transmit_chars(up);
+ return IRQ_HANDLED;
+}
+
+static unsigned int serial_omap_tx_empty(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned long flags;
+ unsigned int ret;
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+ return ret;
+}
+
+static unsigned int serial_omap_get_mctrl(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned char status;
+ unsigned int ret;
+
+ status = serial_in(up, UART_MSR);
+
+ ret = 0;
+ if (status & UART_MSR_DCD)
+ ret |= TIOCM_CAR;
+ if (status & UART_MSR_RI)
+ ret |= TIOCM_RNG;
+ if (status & UART_MSR_DSR)
+ ret |= TIOCM_DSR;
+ if (status & UART_MSR_CTS)
+ ret |= TIOCM_CTS;
+ return ret;
+}
+
+static void serial_omap_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned char mcr = 0;
+
+ if (mctrl & TIOCM_RTS)
+ mcr |= UART_MCR_RTS;
+ if (mctrl & TIOCM_DTR)
+ mcr |= UART_MCR_DTR;
+ if (mctrl & TIOCM_OUT1)
+ mcr |= UART_MCR_OUT1;
+ if (mctrl & TIOCM_OUT2)
+ mcr |= UART_MCR_OUT2;
+ if (mctrl & TIOCM_LOOP)
+ mcr |= UART_MCR_LOOP;
+
+ mcr |= up->mcr;
+
+ serial_out(up, UART_MCR, mcr);
+}
+
+static void serial_omap_break_ctl(struct uart_port *port, int break_state)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned long flags;
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ if (break_state == -1)
+ up->lcr |= UART_LCR_SBC;
+ else
+ up->lcr &= ~UART_LCR_SBC;
+ serial_out(up, UART_LCR, up->lcr);
+ spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static int serial_omap_startup(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned long flags;
+ int retval;
+
+ enable_uart_clocks(up);
+
+ /*
+ * Allocate the IRQ
+ */
+ retval = request_irq(up->port.irq, serial_omap_irq, 0, up->name, up);
+ if (retval) {
+ disable_uart_clocks(up);
+ return retval;
+ }
+
+ /* Stop the baud clock */
+ serial_out(up, UART_LCR, 1 << 7);
+ serial_out(up, UART_DLL, 0);
+ serial_out(up, UART_DLM, 0);
+ serial_out(up, UART_LCR, 0);
+
+ /* Reset the UART */
+ serial_out(up, UART_OMAP_MDR1, 0x07);
+ serial_out(up, UART_OMAP_SCR, 0x08);
+ serial_out(up, UART_OMAP_MDR1, 0x00);
+ serial_out(up, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
+
+
+ /* Enable access to EFR */
+ serial_out(up, UART_LCR, 0xbf);
+ /* Enable access to extra features */
+ serial_out(up, UART_EFR, 1 << 4);
+ /* Enable sleep mode */
+ serial_out(up, UART_IER, 1 << 4);
+
+ /* Set FIFO triggering */
+ serial_out(up, UART_SCR, 0x00);
+ serial_out(up, UART_FCR, (0x01 << 6) | (0x01 << 4) |
+ UART_FCR_ENABLE_FIFO);
+ serial_out(up, UART_FCR, (0x01 << 6) | (0x01 << 4) |
+ UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
+ UART_FCR_ENABLE_FIFO);
+ udelay(50);
+
+ /* Disable access to extra features */
+ serial_out(up, UART_EFR, 0);
+
+ serial_out(up, UART_FCR, 0);
+ serial_out(up, UART_LCR, 0x00);
+
+ /*
+ * Clear the interrupt registers.
+ */
+ (void) serial_in(up, UART_LSR);
+ (void) serial_in(up, UART_RX);
+ (void) serial_in(up, UART_IIR);
+ (void) serial_in(up, UART_MSR);
+
+ /*
+ * Now, initialize the UART
+ */
+ serial_out(up, UART_LCR, UART_LCR_WLEN8);
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ up->port.mctrl |= TIOCM_OUT2;
+ serial_omap_set_mctrl(&up->port, up->port.mctrl);
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+ /*
+ * Finally, enable interrupts. Note: Modem status interrupts
+ * are set via set_termios(), which will be occurring imminently
+ * anyway, so we don't enable them here.
+ */
+ up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE;
+ serial_out(up, UART_IER, up->ier);
+
+ /*
+ * And clear the interrupt registers again for luck.
+ */
+ (void) serial_in(up, UART_LSR);
+ (void) serial_in(up, UART_RX);
+ (void) serial_in(up, UART_IIR);
+ (void) serial_in(up, UART_MSR);
+
+ return 0;
+}
+
+static void serial_omap_shutdown(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned long flags;
+
+ free_irq(up->port.irq, up);
+
+ /*
+ * Disable interrupts from this port
+ */
+ up->ier = 0;
+ serial_out(up, UART_IER, 0);
+
+ spin_lock_irqsave(&up->port.lock, flags);
+ up->port.mctrl &= ~TIOCM_OUT2;
+ serial_omap_set_mctrl(&up->port, up->port.mctrl);
+ spin_unlock_irqrestore(&up->port.lock, flags);
+
+ /*
+ * Disable break condition and FIFOs
+ */
+ serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC);
+ serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
+ UART_FCR_CLEAR_RCVR |
+ UART_FCR_CLEAR_XMIT);
+ serial_out(up, UART_FCR, 0);
+
+ disable_uart_clocks(up);
+
+ clk_put(up->fclk);
+ if (up->iclk != NULL)
+ clk_put(up->iclk);
+}
+
+static void
+serial_omap_set_termios(struct uart_port *port, struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ unsigned char cval, fcr = 0;
+ unsigned long flags;
+ unsigned int baud, quot;
+
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ cval = UART_LCR_WLEN5;
+ break;
+ case CS6:
+ cval = UART_LCR_WLEN6;
+ break;
+ case CS7:
+ cval = UART_LCR_WLEN7;
+ break;
+ default:
+ case CS8:
+ cval = UART_LCR_WLEN8;
+ break;
+ }
+
+ if (termios->c_cflag & CSTOPB)
+ cval |= UART_LCR_STOP;
+ if (termios->c_cflag & PARENB)
+ cval |= UART_LCR_PARITY;
+ if (!(termios->c_cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+
+ /*
+ * Ask the core to calculate the divisor for us.
+ */
+ baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
+ quot = uart_get_divisor(port, baud);
+
+ fcr = (0x01 << 6) | (0x01 << 4) | UART_FCR_ENABLE_FIFO;
+
+ /*
+ * Ok, we're now changing the port state. Do it with
+ * interrupts disabled.
+ */
+ spin_lock_irqsave(&up->port.lock, flags);
+
+ /*
+ * Update the per-port timeout.
+ */
+ uart_update_timeout(port, termios->c_cflag, baud);
+
+ up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+ if (termios->c_iflag & INPCK)
+ up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ up->port.read_status_mask |= UART_LSR_BI;
+
+ /*
+ * Characters to ignore
+ */
+ up->port.ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ if (termios->c_iflag & IGNBRK) {
+ up->port.ignore_status_mask |= UART_LSR_BI;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ up->port.ignore_status_mask |= UART_LSR_OE;
+ }
+
+ /*
+ * ignore all characters if CREAD is not set
+ */
+ if ((termios->c_cflag & CREAD) == 0)
+ up->port.ignore_status_mask |= UART_LSR_DR;
+
+ /*
+ * CTS flow control flag and modem status interrupts
+ */
+ up->ier &= ~UART_IER_MSI;
+ if (UART_ENABLE_MS(&up->port, termios->c_cflag))
+ up->ier |= UART_IER_MSI;
+
+ serial_out(up, UART_IER, up->ier);
+
+ serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
+ serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
+ serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
+ serial_out(up, UART_LCR, cval); /* reset DLAB */
+ up->lcr = cval; /* Save LCR */
+ serial_omap_set_mctrl(&up->port, up->port.mctrl);
+ serial_out(up, UART_FCR, fcr);
+ spin_unlock_irqrestore(&up->port.lock, flags);
+}
+
+static void
+serial_omap_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ /* TODO: can move enable/disable_uart_clock here and
+ * other pm related changes
+ */
+}
+
+static void serial_omap_release_port(struct uart_port *port)
+{
+}
+
+static int serial_omap_request_port(struct uart_port *port)
+{
+ return 0;
+}
+
+static void serial_omap_config_port(struct uart_port *port, int flags)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ up->port.type = PORT_OMAP;
+}
+
+static int
+serial_omap_verify_port(struct uart_port *port, struct serial_struct *ser)
+{
+ /* we don't want the core code to modify any port params */
+ return -EINVAL;
+}
+
+static const char *
+serial_omap_type(struct uart_port *port)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+ return up->name;
+}
+
+#ifdef CONFIG_SERIAL_OMAP_CONSOLE
+
+static struct uart_omap_port *serial_omap_console_ports[3];
+
+static struct uart_driver serial_omap_reg;
+
+#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
+
+/*
+ * Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct uart_omap_port *up)
+{
+ unsigned int status, tmout = 10000;
+
+ /* Wait up to 10ms for the character(s) to be sent. */
+ do {
+ status = serial_in(up, UART_LSR);
+
+ if (status & UART_LSR_BI)
+ up->lsr_break_flag = UART_LSR_BI;
+
+ if (--tmout == 0)
+ break;
+ udelay(1);
+ } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
+
+ /* Wait up to 1s for flow control if necessary */
+ if (up->port.flags & UPF_CONS_FLOW) {
+ tmout = 1000000;
+ while (--tmout &&
+ ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
+ udelay(1);
+ }
+}
+
+static void serial_omap_console_putchar(struct uart_port *port, int ch)
+{
+ struct uart_omap_port *up = (struct uart_omap_port *)port;
+
+ wait_for_xmitr(up);
+ serial_out(up, UART_TX, ch);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ *
+ * The console_lock must be held when we get here.
+ */
+static void
+serial_omap_console_write(struct console *co, const char *s, unsigned int
+count)
+{
+ struct uart_omap_port *up = serial_omap_console_ports[co->index];
+ unsigned int ier;
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = serial_in(up, UART_IER);
+ serial_out(up, UART_IER, 0);
+
+ uart_console_write(&up->port, s, count, serial_omap_console_putchar);
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore the IER
+ */
+ wait_for_xmitr(up);
+ serial_out(up, UART_IER, ier);
+}
+
+static int __init
+serial_omap_console_setup(struct console *co, char *options)
+{
+ struct uart_omap_port *up;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+ int r;
+
+ if (serial_omap_console_ports[co->index] == NULL)
+ return -ENODEV;
+ up = serial_omap_console_ports[co->index];
+
+ enable_uart_clocks(up);
+
+ if (options)
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+
+ r = uart_set_options(&up->port, co, baud, parity, bits, flow);
+
+ return r;
+}
+
+static struct console serial_omap_console = {
+ .name = "ttyS",
+ .write = serial_omap_console_write,
+ .device = uart_console_device,
+ .setup = serial_omap_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+ .data = &serial_omap_reg,
+};
+
+static void serial_omap_add_console_port(struct uart_omap_port *up)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(serial_omap_console_ports); i++)
+ if (serial_omap_console_ports[i] == NULL) {
+ serial_omap_console_ports[i] = up;
+ break;
+ }
+}
+
+#define OMAP_CONSOLE (&serial_omap_console)
+
+#else
+
+#define OMAP_CONSOLE NULL
+
+static inline void serial_omap_add_console_port(struct uart_omap_port *up) {}
+
+#endif
+
+struct uart_ops serial_omap_pops = {
+ .tx_empty = serial_omap_tx_empty,
+ .set_mctrl = serial_omap_set_mctrl,
+ .get_mctrl = serial_omap_get_mctrl,
+ .stop_tx = serial_omap_stop_tx,
+ .start_tx = serial_omap_start_tx,
+ .stop_rx = serial_omap_stop_rx,
+ .enable_ms = serial_omap_enable_ms,
+ .break_ctl = serial_omap_break_ctl,
+ .startup = serial_omap_startup,
+ .shutdown = serial_omap_shutdown,
+ .set_termios = serial_omap_set_termios,
+ .pm = serial_omap_pm,
+ .type = serial_omap_type,
+ .release_port = serial_omap_release_port,
+ .request_port = serial_omap_request_port,
+ .config_port = serial_omap_config_port,
+ .verify_port = serial_omap_verify_port,
+};
+
+static struct uart_driver serial_omap_reg = {
+ .owner = THIS_MODULE,
+ .driver_name = "OMAP-SERIAL",
+ .dev_name = "ttyS",
+ .major = TTY_MAJOR,
+ .minor = 64,
+ .nr = 3,
+ .cons = OMAP_CONSOLE,
+};
+
+static int serial_omap_suspend(struct platform_device *dev, pm_message_t state)
+{
+ struct uart_omap_port *sport = platform_get_drvdata(dev);
+
+ if (sport)
+ uart_suspend_port(&serial_omap_reg, &sport->port);
+
+ return 0;
+}
+
+static int serial_omap_resume(struct platform_device *dev)
+{
+ struct uart_omap_port *sport = platform_get_drvdata(dev);
+
+ if (sport)
+ uart_resume_port(&serial_omap_reg, &sport->port);
+
+ return 0;
+}
+
+static int line;
+
+static int serial_omap_probe(struct platform_device *pdev)
+{
+ struct uart_omap_port *up;
+ struct resource *mem, *irq;
+ char buf[16];
+ int r;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem) {
+ dev_err(&pdev->dev, "no mem resource?\n");
+ return -ENODEV;
+ }
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!irq) {
+ dev_err(&pdev->dev, "no irq resource?\n");
+ return -ENODEV;
+ }
+
+ r = (int) request_mem_region(mem->start, (mem->end - mem->start) + 1,
+ pdev->dev.driver->name);
+ if (!r) {
+ dev_err(&pdev->dev, "memory region already claimed\n");
+ return -EBUSY;
+ }
+
+ up = kzalloc(sizeof(*up), GFP_KERNEL);
+ if (up == NULL) {
+ r = -ENOMEM;
+ goto do_release_region;
+ }
+ sprintf(up->name, "OMAP UART%d", pdev->id);
+
+ platform_set_drvdata(pdev, up);
+ up->pdev = pdev;
+
+ if (!cpu_class_is_omap1()) {
+ sprintf(buf, "uart%d_fck", pdev->id);
+ up->fclk = clk_get(&pdev->dev, buf);
+ if (IS_ERR(up->fclk)) {
+ dev_err(&pdev->dev, "could not get fclk\n");
+ return PTR_ERR(up->fclk);
+ }
+ sprintf(buf, "uart%d_ick", pdev->id);
+ up->iclk = clk_get(&pdev->dev, buf);
+ if (IS_ERR(up->iclk)) {
+ dev_err(&pdev->dev, "could not get iclk\n");
+ clk_put(up->fclk);
+ return PTR_ERR(up->iclk);
+ }
+ }
+
+ up->port.type = PORT_OMAP;
+ up->port.iotype = UPIO_MEM;
+ up->port.membase = (void *) io_p2v(mem->start);
+ up->port.mapbase = mem->start;
+ up->port.irq = irq->start;
+ up->port.fifosize = 64;
+ up->port.ops = &serial_omap_pops;
+ up->port.line = line++;
+
+ up->port.uartclk = 2995200 * 16;
+ up->shift = 2;
+
+ serial_omap_add_console_port(up);
+
+ uart_add_one_port(&serial_omap_reg, &up->port);
+ platform_set_drvdata(pdev, up);
+
+ return 0;
+
+do_release_region:
+ release_mem_region(mem->start, (mem->end - mem->start) + 1);
+ return r;
+}
+
+static int serial_omap_remove(struct platform_device *dev)
+{
+ struct uart_omap_port *sport = platform_get_drvdata(dev);
+
+ platform_set_drvdata(dev, NULL);
+
+ if (sport)
+ uart_remove_one_port(&serial_omap_reg, &sport->port);
+
+ return 0;
+}
+
+static struct platform_driver serial_omap_driver = {
+ .probe = serial_omap_probe,
+ .remove = serial_omap_remove,
+
+ .suspend = serial_omap_suspend,
+ .resume = serial_omap_resume,
+ .driver = {
+ .name = "omap-uart",
+ },
+};
+
+int __init serial_omap_init(void)
+{
+ int ret;
+
+ ret = uart_register_driver(&serial_omap_reg);
+ if (ret != 0)
+ return ret;
+
+ ret = platform_driver_register(&serial_omap_driver);
+ if (ret != 0)
+ uart_unregister_driver(&serial_omap_reg);
+
+ return ret;
+}
+
+void __exit serial_omap_exit(void)
+{
+ platform_driver_unregister(&serial_omap_driver);
+ uart_unregister_driver(&serial_omap_reg);
+}
+
+subsys_initcall(serial_omap_init);
+module_exit(serial_omap_exit);
+
+MODULE_LICENSE("GPL");
Index: linux-omap-2.6/include/linux/serial_core.h
===================================================================
--- linux-omap-2.6.orig/include/linux/serial_core.h 2008-07-31
11:15:55.000000000 +0530
+++ linux-omap-2.6/include/linux/serial_core.h 2008-07-31 11:25:24.000000000 +0530
@@ -158,6 +158,9 @@
#define PORT_SC26XX 82
+/* OMAP serial */
+#define PORT_OMAP 83
+
#ifdef __KERNEL__
#include <linux/compiler.h>
--
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