X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=arch%2Farm%2Fmach-omap2%2Fserial.c;fp=arch%2Farm%2Fmach-omap2%2Fserial.c;h=8c161dde24a097dc2842374792801aaaec6b28f6;hb=77d8bc05d620bf469a5cf6ef1621ff7235d78080;hp=4dcf39c285b94bac5e1e6292469299c633fcd0bf;hpb=6bcb6267a4ad617dee92d04947ef7f9cc78266bb;p=linux-2.6-omap-h63xx.git

diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index 4dcf39c285b..8c161dde24a 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -6,6 +6,8 @@
  * 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
  *
  * This file is subject to the terms and conditions of the GNU General Public
@@ -21,9 +23,36 @@
 
 #include <mach/common.h>
 #include <mach/board.h>
+#include <mach/clock.h>
+#include <mach/control.h>
+
+#include "prm.h"
+#include "pm.h"
+#include "prm-regbits-34xx.h"
+
+#define DEFAULT_TIMEOUT (2 * HZ)
+
+struct omap_uart_state {
+	int num;
+	int can_sleep;
+	struct timer_list timer;
+	u32 timeout;
 
-static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
-static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
+	void __iomem *wk_st;
+	void __iomem *wk_en;
+	u32 wk_mask;
+	u32 padconf;
+
+	struct clk *ick;
+	struct clk *fck;
+	int clocked;
+
+	struct plat_serial8250_port *p;
+	struct list_head node;
+};
+
+static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS];
+static LIST_HEAD(uart_list);
 
 static struct plat_serial8250_port serial_platform_data[] = {
 	{
@@ -74,30 +103,257 @@ static inline void serial_write_reg(struct plat_serial8250_port *p, int offset,
  * 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 inline void __init omap_uart_reset(struct omap_uart_state *uart)
 {
+	struct plat_serial8250_port *p = uart->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));
 }
 
-void omap_serial_enable_clocks(int enable)
+#ifdef CONFIG_PM
+static void omap_uart_smart_idle_enable(struct omap_uart_state *uart,
+					  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]);
+	struct plat_serial8250_port *p = uart->p;
+	u16 sysc;
+
+	sysc = serial_read_reg(p, UART_OMAP_SYSC) & 0x7;
+	if (enable)
+		sysc |= 0x2 << 3;
+	else
+		sysc |= 0x1 << 3;
+
+	serial_write_reg(p, UART_OMAP_SYSC, sysc);
+}
+
+static inline void omap_uart_enable_clocks(struct omap_uart_state *uart)
+{
+	if (uart->clocked)
+		return;
+
+	clk_enable(uart->ick);
+	clk_enable(uart->fck);
+	uart->clocked = 1;
+}
+
+static inline void omap_uart_disable_clocks(struct omap_uart_state *uart)
+{
+	if (!uart->clocked)
+		return;
+
+	uart->clocked = 0;
+	clk_disable(uart->ick);
+	clk_disable(uart->fck);
+}
+
+static void omap_uart_block_sleep(struct omap_uart_state *uart)
+{
+	omap_uart_enable_clocks(uart);
+
+	omap_uart_smart_idle_enable(uart, 0);
+	uart->can_sleep = 0;
+	mod_timer(&uart->timer, jiffies + uart->timeout);
+}
+
+static void omap_uart_allow_sleep(struct omap_uart_state *uart)
+{
+	if (!uart->clocked)
+		return;
+
+	omap_uart_smart_idle_enable(uart, 1);
+	uart->can_sleep = 1;
+	del_timer(&uart->timer);
+}
+
+static void omap_uart_idle_timer(unsigned long data)
+{
+	struct omap_uart_state *uart = (struct omap_uart_state *)data;
+
+	omap_uart_allow_sleep(uart);
+}
+
+void omap_uart_prepare_idle(int num)
+{
+	struct omap_uart_state *uart;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		if (!clocks_off_while_idle)
+			continue;
+
+		if (num == uart->num && uart->can_sleep) {
+			omap_uart_disable_clocks(uart);
+			return;
+		}
+	}
+}
+
+void omap_uart_resume_idle(int num)
+{
+	struct omap_uart_state *uart;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		if (num == uart->num) {
+			omap_uart_enable_clocks(uart);
+
+			/* Check for IO pad wakeup */
+			if (cpu_is_omap34xx() && uart->padconf) {
+				u16 p = omap_ctrl_readw(uart->padconf);
+
+				if (p & OMAP3_PADCONF_WAKEUPEVENT0)
+					omap_uart_block_sleep(uart);
 			}
+
+			/* Check for normal UART wakeup */
+			if (__raw_readl(uart->wk_st) & uart->wk_mask)
+				omap_uart_block_sleep(uart);
+
+			return;
 		}
 	}
 }
 
+void omap_uart_prepare_suspend(void)
+{
+	struct omap_uart_state *uart;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		omap_uart_allow_sleep(uart);
+	}
+}
+
+int omap_uart_can_sleep(void)
+{
+	struct omap_uart_state *uart;
+	int can_sleep = 1;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		if (!uart->clocked)
+			continue;
+
+		if (!uart->can_sleep) {
+			can_sleep = 0;
+			continue;
+		}
+
+		/* This UART can now safely sleep. */
+		omap_uart_allow_sleep(uart);
+	}
+
+	return can_sleep;
+}
+
+/**
+ * omap_uart_interrupt()
+ *
+ * This handler is used only to detect that *any* UART interrupt has
+ * occurred.  It does _nothing_ to handle the interrupt.  Rather,
+ * any UART interrupt will trigger the inactivity timer so the
+ * UART will not idle or sleep for its timeout period.
+ *
+ **/
+static irqreturn_t omap_uart_interrupt(int irq, void *dev_id)
+{
+	struct omap_uart_state *uart = dev_id;
+
+	omap_uart_block_sleep(uart);
+
+	return IRQ_NONE;
+}
+
+static void omap_uart_idle_init(struct omap_uart_state *uart)
+{
+	u32 v;
+	struct plat_serial8250_port *p = uart->p;
+	int ret;
+
+	uart->can_sleep = 0;
+	uart->timeout = DEFAULT_TIMEOUT;
+	setup_timer(&uart->timer, omap_uart_idle_timer,
+		    (unsigned long) uart);
+	mod_timer(&uart->timer, jiffies + uart->timeout);
+	omap_uart_smart_idle_enable(uart, 0);
+
+	if (cpu_is_omap34xx()) {
+		u32 mod = (uart->num == 2) ? OMAP3430_PER_MOD : CORE_MOD;
+		u32 wk_mask = 0;
+		u32 padconf = 0;
+
+		uart->wk_en = OMAP34XX_PRM_REGADDR(mod, PM_WKEN1);
+		uart->wk_st = OMAP34XX_PRM_REGADDR(mod, PM_WKST1);
+		switch (uart->num) {
+		case 0:
+			wk_mask = OMAP3430_ST_UART1_MASK;
+			padconf = 0x182;
+			break;
+		case 1:
+			wk_mask = OMAP3430_ST_UART2_MASK;
+			padconf = 0x17a;
+			break;
+		case 2:
+			wk_mask = OMAP3430_ST_UART3_MASK;
+			padconf = 0x19e;
+			break;
+		}
+		uart->wk_mask = wk_mask;
+		uart->padconf = padconf;
+	} else if (cpu_is_omap24xx()) {
+		u32 wk_mask = 0;
+
+		if (cpu_is_omap2430()) {
+			uart->wk_en = OMAP2430_PRM_REGADDR(CORE_MOD, PM_WKEN1);
+			uart->wk_st = OMAP2430_PRM_REGADDR(CORE_MOD, PM_WKST1);
+		} else if (cpu_is_omap2420()) {
+			uart->wk_en = OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKEN1);
+			uart->wk_st = OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKST1);
+		}
+		switch (uart->num) {
+		case 0:
+			wk_mask = OMAP24XX_ST_UART1_MASK;
+			break;
+		case 1:
+			wk_mask = OMAP24XX_ST_UART2_MASK;
+			break;
+		case 2:
+			wk_mask = OMAP24XX_ST_UART3_MASK;
+			break;
+		}
+		uart->wk_mask = wk_mask;
+	} else {
+		uart->wk_en = 0;
+		uart->wk_st = 0;
+		uart->wk_mask = 0;
+		uart->padconf = 0;
+	}
+
+	/* Set wake-enable bit */
+	if (uart->wk_en && uart->wk_mask) {
+		v = __raw_readl(uart->wk_en);
+		v |= uart->wk_mask;
+		__raw_writel(v, uart->wk_en);
+	}
+
+	/* Ensure IOPAD wake-enables are set */
+	if (cpu_is_omap34xx() && uart->padconf) {
+		u16 v;
+
+		v = omap_ctrl_readw(uart->padconf);
+		v |= OMAP3_PADCONF_WAKEUPENABLE0;
+		omap_ctrl_writew(v, uart->padconf);
+	}
+
+	p->flags |= UPF_SHARE_IRQ;
+	ret = request_irq(p->irq, omap_uart_interrupt, IRQF_SHARED,
+			  "serial idle", (void *)uart);
+	WARN_ON(ret);
+}
+
+#else
+static inline void omap_uart_idle_init(struct omap_uart_state *uart) {}
+#endif /* CONFIG_PM */
+
 void __init omap_serial_init(void)
 {
 	int i;
@@ -117,6 +373,7 @@ void __init omap_serial_init(void)
 
 	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
 		struct plat_serial8250_port *p = serial_platform_data + i;
+		struct omap_uart_state *uart = &omap_uart[i];
 
 		if (!(info->enabled_uarts & (1 << i))) {
 			p->membase = NULL;
@@ -125,22 +382,30 @@ void __init omap_serial_init(void)
 		}
 
 		sprintf(name, "uart%d_ick", i+1);
-		uart_ick[i] = clk_get(NULL, name);
-		if (IS_ERR(uart_ick[i])) {
+		uart->ick = clk_get(NULL, name);
+		if (IS_ERR(uart->ick)) {
 			printk(KERN_ERR "Could not get uart%d_ick\n", i+1);
-			uart_ick[i] = NULL;
-		} else
-			clk_enable(uart_ick[i]);
+			uart->ick = NULL;
+		}
 
 		sprintf(name, "uart%d_fck", i+1);
-		uart_fck[i] = clk_get(NULL, name);
-		if (IS_ERR(uart_fck[i])) {
+		uart->fck = clk_get(NULL, name);
+		if (IS_ERR(uart->fck)) {
 			printk(KERN_ERR "Could not get uart%d_fck\n", i+1);
-			uart_fck[i] = NULL;
-		} else
-			clk_enable(uart_fck[i]);
+			uart->fck = NULL;
+		}
+
+		if (!uart->ick || !uart->fck)
+			continue;
+
+		uart->num = i;
+		p->private_data = uart;
+		uart->p = p;
+		list_add(&uart->node, &uart_list);
 
-		omap_serial_reset(p);
+		omap_uart_enable_clocks(uart);
+		omap_uart_reset(uart);
+		omap_uart_idle_init(uart);
 	}
 }