1 files changed, 284 insertions, 129 deletions

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index e9c367fc9f6..a388f8c1bcb 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -3,178 +3,333 @@
  *
  * OMAP2 serial support.
  *
- * Copyright (C) 2005 Nokia Corporation
+ * Copyright (C) 2005-2008 Nokia Corporation
  * Author: Paul Mundt <paul.mundt@nokia.com>
  *
+ * Major rework for PM support by Kevin Hilman
+ *
  * Based off of arch/arm/mach-omap/omap1/serial.c
  *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
+ *
  * This file is subject to the terms and conditions of the GNU General Public
  * License. See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/serial_8250.h>
-#include <linux/serial_reg.h>
 #include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/console.h>
+#include <linux/omap-dma.h>
+#include <linux/platform_data/serial-omap.h>
+
+#include "common.h"
+#include "omap_hwmod.h"
+#include "omap_device.h"
+#include "omap-pm.h"
+#include "soc.h"
+#include "prm2xxx_3xxx.h"
+#include "pm.h"
+#include "cm2xxx_3xxx.h"
+#include "prm-regbits-34xx.h"
+#include "control.h"
+#include "mux.h"
+#include "serial.h"
+
+/*
+ * NOTE: By default the serial auto_suspend timeout is disabled as it causes
+ * lost characters over the serial ports. This means that the UART clocks will
+ * stay on until power/autosuspend_delay is set for the uart from sysfs.
+ * This also causes that any deeper omap sleep states are blocked.
+ */
+#define DEFAULT_AUTOSUSPEND_DELAY	-1
+
+#define MAX_UART_HWMOD_NAME_LEN		16
 
-#include <asm/io.h>
+struct omap_uart_state {
+	int num;
 
-#include <asm/arch/common.h>
-#include <asm/arch/board.h>
+	struct list_head node;
+	struct omap_hwmod *oh;
+	struct omap_device_pad default_omap_uart_pads[2];
+};
 
-static struct clk * uart1_ick = NULL;
-static struct clk * uart1_fck = NULL;
-static struct clk * uart2_ick = NULL;
-static struct clk * uart2_fck = NULL;
-static struct clk * uart3_ick = NULL;
-static struct clk * uart3_fck = NULL;
+static LIST_HEAD(uart_list);
+static u8 num_uarts;
+static u8 console_uart_id = -1;
+static u8 uart_debug;
 
-static struct plat_serial8250_port serial_platform_data[] = {
+#define DEFAULT_RXDMA_POLLRATE		1	/* RX DMA polling rate (us) */
+#define DEFAULT_RXDMA_BUFSIZE		4096	/* RX DMA buffer size */
+#define DEFAULT_RXDMA_TIMEOUT		(3 * HZ)/* RX DMA timeout (jiffies) */
+
+static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
 	{
-		.membase	= (char *)IO_ADDRESS(OMAP_UART1_BASE),
-		.mapbase	= (unsigned long)OMAP_UART1_BASE,
-		.irq		= 72,
-		.flags		= UPF_BOOT_AUTOCONF,
-		.iotype		= UPIO_MEM,
-		.regshift	= 2,
-		.uartclk	= OMAP16XX_BASE_BAUD * 16,
-	}, {
-		.membase	= (char *)IO_ADDRESS(OMAP_UART2_BASE),
-		.mapbase	= (unsigned long)OMAP_UART2_BASE,
-		.irq		= 73,
-		.flags		= UPF_BOOT_AUTOCONF,
-		.iotype		= UPIO_MEM,
-		.regshift	= 2,
-		.uartclk	= OMAP16XX_BASE_BAUD * 16,
-	}, {
-		.membase	= (char *)IO_ADDRESS(OMAP_UART3_BASE),
-		.mapbase	= (unsigned long)OMAP_UART3_BASE,
-		.irq		= 74,
-		.flags		= UPF_BOOT_AUTOCONF,
-		.iotype		= UPIO_MEM,
-		.regshift	= 2,
-		.uartclk	= OMAP16XX_BASE_BAUD * 16,
-	}, {
-		.flags		= 0
-	}
+		.dma_enabled	= false,
+		.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
+		.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
+		.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
+		.autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
+	},
 };
 
-static inline unsigned int serial_read_reg(struct plat_serial8250_port *up,
-					   int offset)
+#ifdef CONFIG_PM
+static void omap_uart_enable_wakeup(struct device *dev, bool enable)
 {
-	offset <<= up->regshift;
-	return (unsigned int)__raw_readb(up->membase + offset);
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od = to_omap_device(pdev);
+
+	if (!od)
+		return;
+
+	if (enable)
+		omap_hwmod_enable_wakeup(od->hwmods[0]);
+	else
+		omap_hwmod_disable_wakeup(od->hwmods[0]);
 }
 
-static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
-				    int value)
+#else
+static void omap_uart_enable_wakeup(struct device *dev, bool enable)
+{}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OMAP_MUX
+
+#define OMAP_UART_DEFAULT_PAD_NAME_LEN	28
+static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
+		tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
+
+static void  __init
+omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
+				struct omap_uart_state *uart)
 {
-	offset <<= p->regshift;
-	__raw_writeb(value, (unsigned long)(p->membase + offset));
+	uart->default_omap_uart_pads[0].name = rx_pad_name;
+	uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
+							OMAP_DEVICE_PAD_WAKEUP;
+	uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
+							OMAP_MUX_MODE0;
+	uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
+	uart->default_omap_uart_pads[1].name = tx_pad_name;
+	uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
+							OMAP_MUX_MODE0;
+	bdata->pads = uart->default_omap_uart_pads;
+	bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
 }
 
-/*
- * 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)
+static void  __init omap_serial_check_wakeup(struct omap_board_data *bdata,
+						struct omap_uart_state *uart)
 {
-	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));
+	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
+	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
+	char *rx_fmt, *tx_fmt;
+	int uart_nr = bdata->id + 1;
+
+	if (bdata->id != 2) {
+		rx_fmt = "uart%d_rx.uart%d_rx";
+		tx_fmt = "uart%d_tx.uart%d_tx";
+	} else {
+		rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
+		tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
+	}
+
+	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
+			uart_nr, uart_nr);
+	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
+			uart_nr, uart_nr);
+
+	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
+			omap_mux_get_by_name
+				(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
+		u16 tx_mode, rx_mode;
+
+		tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
+		rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
+
+		/*
+		 * Check if uart is used in default tx/rx mode i.e. in mux mode0
+		 * if yes then configure rx pin for wake up capability
+		 */
+		if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode))
+			omap_serial_fill_uart_tx_rx_pads(bdata, uart);
+	}
 }
+#else
+static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
+		struct omap_uart_state *uart)
+{
+}
+#endif
 
-void __init omap_serial_init()
+static char *cmdline_find_option(char *str)
 {
-	int i;
-	const struct omap_uart_config *info;
+	extern char *saved_command_line;
 
-	/*
-	 * Make sure the serial ports are muxed on at this point.
-	 * You have to mux them off in device drivers later on
-	 * if not needed.
-	 */
+	return strstr(saved_command_line, str);
+}
 
-	info = omap_get_config(OMAP_TAG_UART,
-			       struct omap_uart_config);
+static int __init omap_serial_early_init(void)
+{
+	if (of_have_populated_dt())
+		return -ENODEV;
 
-	if (info == NULL)
-		return;
+	do {
+		char oh_name[MAX_UART_HWMOD_NAME_LEN];
+		struct omap_hwmod *oh;
+		struct omap_uart_state *uart;
+		char uart_name[MAX_UART_HWMOD_NAME_LEN];
 
-	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
-		struct plat_serial8250_port *p = serial_platform_data + i;
+		snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
+			 "uart%d", num_uarts + 1);
+		oh = omap_hwmod_lookup(oh_name);
+		if (!oh)
+			break;
 
-		if (!(info->enabled_uarts & (1 << i))) {
-			p->membase = 0;
-			p->mapbase = 0;
-			continue;
-		}
+		uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
+		if (WARN_ON(!uart))
+			return -ENODEV;
 
-		switch (i) {
-		case 0:
-			uart1_ick = clk_get(NULL, "uart1_ick");
-			if (IS_ERR(uart1_ick))
-				printk("Could not get uart1_ick\n");
-			else {
-				clk_enable(uart1_ick);
-			}
+		uart->oh = oh;
+		uart->num = num_uarts++;
+		list_add_tail(&uart->node, &uart_list);
+		snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
+				"%s%d", OMAP_SERIAL_NAME, uart->num);
 
-			uart1_fck = clk_get(NULL, "uart1_fck");
-			if (IS_ERR(uart1_fck))
-				printk("Could not get uart1_fck\n");
-			else {
-				clk_enable(uart1_fck);
-			}
-			break;
-		case 1:
-			uart2_ick = clk_get(NULL, "uart2_ick");
-			if (IS_ERR(uart2_ick))
-				printk("Could not get uart2_ick\n");
-			else {
-				clk_enable(uart2_ick);
-			}
+		if (cmdline_find_option(uart_name)) {
+			console_uart_id = uart->num;
 
-			uart2_fck = clk_get(NULL, "uart2_fck");
-			if (IS_ERR(uart2_fck))
-				printk("Could not get uart2_fck\n");
-			else {
-				clk_enable(uart2_fck);
-			}
-			break;
-		case 2:
-			uart3_ick = clk_get(NULL, "uart3_ick");
-			if (IS_ERR(uart3_ick))
-				printk("Could not get uart3_ick\n");
-			else {
-				clk_enable(uart3_ick);
+			if (console_loglevel >= 10) {
+				uart_debug = true;
+				pr_info("%s used as console in debug mode: uart%d clocks will not be gated",
+					uart_name, uart->num);
 			}
+		}
+	} while (1);
 
-			uart3_fck = clk_get(NULL, "uart3_fck");
-			if (IS_ERR(uart3_fck))
-				printk("Could not get uart3_fck\n");
-			else {
-				clk_enable(uart3_fck);
-			}
+	return 0;
+}
+omap_core_initcall(omap_serial_early_init);
+
+/**
+ * omap_serial_init_port() - initialize single serial port
+ * @bdata: port specific board data pointer
+ * @info: platform specific data pointer
+ *
+ * This function initialies serial driver for given port only.
+ * Platforms can call this function instead of omap_serial_init()
+ * if they don't plan to use all available UARTs as serial ports.
+ *
+ * Don't mix calls to omap_serial_init_port() and omap_serial_init(),
+ * use only one of the two.
+ */
+void __init omap_serial_init_port(struct omap_board_data *bdata,
+			struct omap_uart_port_info *info)
+{
+	struct omap_uart_state *uart;
+	struct omap_hwmod *oh;
+	struct platform_device *pdev;
+	void *pdata = NULL;
+	u32 pdata_size = 0;
+	char *name;
+	struct omap_uart_port_info omap_up;
+
+	if (WARN_ON(!bdata))
+		return;
+	if (WARN_ON(bdata->id < 0))
+		return;
+	if (WARN_ON(bdata->id >= num_uarts))
+		return;
+
+	list_for_each_entry(uart, &uart_list, node)
+		if (bdata->id == uart->num)
 			break;
-		}
+	if (!info)
+		info = omap_serial_default_info;
+
+	oh = uart->oh;
+	name = DRIVER_NAME;
+
+	omap_up.dma_enabled = info->dma_enabled;
+	omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
+	omap_up.flags = UPF_BOOT_AUTOCONF;
+	omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
+	omap_up.enable_wakeup = omap_uart_enable_wakeup;
+	omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
+	omap_up.dma_rx_timeout = info->dma_rx_timeout;
+	omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
+	omap_up.autosuspend_timeout = info->autosuspend_timeout;
+	omap_up.DTR_gpio = info->DTR_gpio;
+	omap_up.DTR_inverted = info->DTR_inverted;
+	omap_up.DTR_present = info->DTR_present;
+
+	pdata = &omap_up;
+	pdata_size = sizeof(struct omap_uart_port_info);
+
+	if (WARN_ON(!oh))
+		return;
+
+	pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size);
+	if (IS_ERR(pdev)) {
+		WARN(1, "Could not build omap_device for %s: %s.\n", name,
+		     oh->name);
+		return;
+	}
+
+	oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
 
-		omap_serial_reset(p);
+	if (console_uart_id == bdata->id) {
+		omap_device_enable(pdev);
+		pm_runtime_set_active(&pdev->dev);
 	}
+
+	oh->dev_attr = uart;
+
+	if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
+			&& !uart_debug)
+		device_init_wakeup(&pdev->dev, true);
 }
 
-static struct platform_device serial_device = {
-	.name			= "serial8250",
-	.id			= PLAT8250_DEV_PLATFORM,
-	.dev			= {
-		.platform_data	= serial_platform_data,
-	},
-};
+/**
+ * omap_serial_board_init() - initialize all supported serial ports
+ * @info: platform specific data pointer
+ *
+ * Initializes all available UARTs as serial ports. Platforms
+ * can call this function when they want to have default behaviour
+ * for serial ports (e.g initialize them all as serial ports).
+ */
+void __init omap_serial_board_init(struct omap_uart_port_info *info)
+{
+	struct omap_uart_state *uart;
+	struct omap_board_data bdata;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		bdata.id = uart->num;
+		bdata.flags = 0;
+		bdata.pads = NULL;
+		bdata.pads_cnt = 0;
 
-static int __init omap_init(void)
+		omap_serial_check_wakeup(&bdata, uart);
+
+		if (!info)
+			omap_serial_init_port(&bdata, NULL);
+		else
+			omap_serial_init_port(&bdata, &info[uart->num]);
+	}
+}
+
+/**
+ * omap_serial_init() - initialize all supported serial ports
+ *
+ * Initializes all available UARTs.
+ * Platforms can call this function when they want to have default behaviour
+ * for serial ports (e.g initialize them all as serial ports).
+ */
+void __init omap_serial_init(void)
 {
-	return platform_device_register(&serial_device);
+	omap_serial_board_init(NULL);
 }
-arch_initcall(omap_init);