From: Tero Kristo <tero.kristo@xxxxxxxxx>
UART usage (e.g. serial console) now denies sleep for 5 seconds. This
makes it possible to use serial console when dynamic idle is
enabled. Write 1 to /sys/power/clocks_off_while_sleep to enable uart
clock disable on idle. Without this omap won't enter retention.
Also moved code from pm-debug.c to serial.c, and made pm24xx.c use
this new implementation.
Signed-off-by: Jouni Hogander <jouni.hogander@xxxxxxxxx>
---
arch/arm/mach-omap2/pm-debug.c | 132 --------------------------------
arch/arm/mach-omap2/pm.h | 8 --
arch/arm/mach-omap2/pm24xx.c | 57 ++++++++------
arch/arm/mach-omap2/pm34xx.c | 16 ++++-
arch/arm/mach-omap2/serial.c | 148 ++++++++++++++++++++++++++++++++++++
include/asm-arm/arch-omap/common.h | 3 +
6 files changed, 200 insertions(+), 164 deletions(-)
diff --git a/arch/arm/mach-omap2/pm-debug.c b/arch/arm/mach-omap2/pm-debug.c
index a32f11f..61d4501 100644
--- a/arch/arm/mach-omap2/pm-debug.c
+++ b/arch/arm/mach-omap2/pm-debug.c
@@ -37,138 +37,6 @@
#ifdef CONFIG_PM_DEBUG
int omap2_pm_debug = 0;
-static int serial_console_clock_disabled;
-static int serial_console_uart;
-static unsigned int serial_console_next_disable;
-
-static struct clk *console_iclk, *console_fclk;
-
-static void serial_console_kick(void)
-{
- serial_console_next_disable = omap2_read_32k_sync_counter();
- /* Keep the clocks on for 4 secs */
- serial_console_next_disable += 4 * 32768;
-}
-
-static void serial_wait_tx(void)
-{
- static const unsigned long uart_bases[3] = {
- 0x4806a000, 0x4806c000, 0x4806e000
- };
- unsigned long lsr_reg;
- int looped = 0;
-
- /* Wait for TX FIFO and THR to get empty */
- lsr_reg = IO_ADDRESS(uart_bases[serial_console_uart - 1] + (5 << 2));
- while ((__raw_readb(lsr_reg) & 0x60) != 0x60)
- looped = 1;
- if (looped)
- serial_console_kick();
-}
-
-u32 omap2_read_32k_sync_counter(void)
-{
- return omap_readl(OMAP2_32KSYNCT_BASE + 0x0010);
-}
-
-void serial_console_fclk_mask(u32 *f1, u32 *f2)
-{
- switch (serial_console_uart) {
- case 1:
- *f1 &= ~(1 << 21);
- break;
- case 2:
- *f1 &= ~(1 << 22);
- break;
- case 3:
- *f2 &= ~(1 << 2);
- break;
- }
-}
-
-void serial_console_sleep(int enable)
-{
- if (console_iclk == NULL || console_fclk == NULL)
- return;
-
- if (enable) {
- BUG_ON(serial_console_clock_disabled);
- if (clk_get_usecount(console_fclk) == 0)
- return;
- if ((int) serial_console_next_disable - (int) omap2_read_32k_sync_counter() >= 0)
- return;
- serial_wait_tx();
- clk_disable(console_iclk);
- clk_disable(console_fclk);
- serial_console_clock_disabled = 1;
- } else {
- int serial_wakeup = 0;
- u32 l;
-
- switch (serial_console_uart) {
- case 1:
- l = prm_read_mod_reg(CORE_MOD, PM_WKST1);
- if (l & OMAP24XX_ST_UART1)
- serial_wakeup = 1;
- break;
- case 2:
- l = prm_read_mod_reg(CORE_MOD, PM_WKST1);
- if (l & OMAP24XX_ST_UART2)
- serial_wakeup = 1;
- break;
- case 3:
- l = prm_read_mod_reg(CORE_MOD, OMAP24XX_PM_WKST2);
- if (l & OMAP24XX_ST_UART3)
- serial_wakeup = 1;
- break;
- }
- if (serial_wakeup)
- serial_console_kick();
- if (!serial_console_clock_disabled)
- return;
- clk_enable(console_iclk);
- clk_enable(console_fclk);
- serial_console_clock_disabled = 0;
- }
-}
-
-void pm_init_serial_console(void)
-{
- const struct omap_serial_console_config *conf;
- char name[16];
-
- conf = omap_get_config(OMAP_TAG_SERIAL_CONSOLE,
- struct omap_serial_console_config);
- if (conf == NULL)
- return;
- if (conf->console_uart > 3 || conf->console_uart < 1)
- return;
- serial_console_uart = conf->console_uart;
- sprintf(name, "uart%d_fck", conf->console_uart);
- console_fclk = clk_get(NULL, name);
- if (IS_ERR(console_fclk))
- console_fclk = NULL;
- name[6] = 'i';
- console_iclk = clk_get(NULL, name);
- if (IS_ERR(console_fclk))
- console_iclk = NULL;
- if (console_fclk == NULL || console_iclk == NULL) {
- serial_console_uart = 0;
- return;
- }
- switch (serial_console_uart) {
- case 1:
- prm_set_mod_reg_bits(OMAP24XX_ST_UART1, CORE_MOD, PM_WKEN1);
- break;
- case 2:
- prm_set_mod_reg_bits(OMAP24XX_ST_UART2, CORE_MOD, PM_WKEN1);
- break;
- case 3:
- prm_set_mod_reg_bits(OMAP24XX_ST_UART3, CORE_MOD, OMAP24XX_PM_WKEN2);
- break;
- }
-}
-
#define DUMP_PRM_MOD_REG(mod, reg) \
regs[reg_count].name = #mod "." #reg; \
regs[reg_count++].val = prm_read_mod_reg(mod, reg)
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 0aeb461..8825339 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -21,18 +21,10 @@ extern unsigned short clocks_off_while_idle;
extern atomic_t sleep_block;
#ifdef CONFIG_PM_DEBUG
-extern u32 omap2_read_32k_sync_counter(void);
extern void omap2_pm_dump(int mode, int resume, unsigned int us);
-extern void serial_console_fclk_mask(u32 *f1, u32 *f2);
-extern void pm_init_serial_console(void);
-extern void serial_console_sleep(int enable);
extern int omap2_pm_debug;
#else
-#define omap2_read_32k_sync_counter() 0;
-#define serial_console_sleep(enable) do; while(0)
-#define pm_init_serial_console() do; while(0)
#define omap2_pm_dump(mode,resume,us) do; while(0)
-#define serial_console_fclk_mask(f1,f2) do; while(0)
#define omap2_pm_debug 0
#endif /* CONFIG_PM_DEBUG */
#endif
diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c
index 69972a2..ad5078e 100644
--- a/arch/arm/mach-omap2/pm24xx.c
+++ b/arch/arm/mach-omap2/pm24xx.c
@@ -44,6 +44,7 @@
#include <asm/arch/mux.h>
#include <asm/arch/dma.h>
#include <asm/arch/board.h>
+#include <asm/arch/common.h>
#include "prm.h"
#include "prm-regbits-24xx.h"
@@ -73,7 +74,10 @@ static int omap2_fclks_active(void)
f1 = cm_read_mod_reg(CORE_MOD, CM_FCLKEN1);
f2 = cm_read_mod_reg(CORE_MOD, OMAP24XX_CM_FCLKEN2);
- serial_console_fclk_mask(&f1, &f2);
+
+ if (uart_clocks_off_while_sleep)
+ omap_serial_fclk_mask(&f1, &f2);
+
if (f1 | f2)
return 1;
return 0;
@@ -81,7 +85,8 @@ static int omap2_fclks_active(void)
static void omap2_enter_full_retention(void)
{
- u32 l, sleep_time = 0;
+ u32 l = 0;
+ struct timespec sleep_time;
/* There is 1 reference hold for all children of the oscillator
* clock, the following will remove it. If no one else uses the
@@ -111,28 +116,33 @@ static void omap2_enter_full_retention(void)
if (omap2_pm_debug) {
omap2_pm_dump(0, 0, 0);
- sleep_time = omap2_read_32k_sync_counter();
+ getnstimeofday(&sleep_time);
}
+ if (uart_clocks_off_while_sleep)
+ omap_serial_enable_clocks(0);
+
/* One last check for pending IRQs to avoid extra latency due
* to sleeping unnecessarily. */
if (omap_irq_pending())
goto no_sleep;
- serial_console_sleep(1);
/* Jump to SRAM suspend code */
omap2_sram_suspend(OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL));
no_sleep:
- serial_console_sleep(0);
+ omap_serial_check_wakeup();
+ if (uart_clocks_off_while_sleep)
+ omap_serial_enable_clocks(1);
if (omap2_pm_debug) {
- unsigned long long tmp;
- u32 resume_time;
-
- resume_time = omap2_read_32k_sync_counter();
- tmp = resume_time - sleep_time;
- tmp *= 1000000;
- omap2_pm_dump(0, 1, tmp / 32768);
+ struct timespec t;
+ struct timespec ts_delta;
+
+ getnstimeofday(&t);
+ ts_delta = timespec_sub(t, sleep_time);
+ omap2_pm_dump(0, 1,
+ div_s64(timespec_to_ns(&ts_delta),
+ NSEC_PER_USEC));
}
omap2_gpio_resume_after_retention();
@@ -193,7 +203,7 @@ static int omap2_allow_mpu_retention(void)
static void omap2_enter_mpu_retention(void)
{
- u32 sleep_time = 0;
+ struct timespec sleep_time;
int only_idle = 0;
/* Putting MPU into the WFI state while a transfer is active
@@ -222,19 +232,20 @@ static void omap2_enter_mpu_retention(void)
if (omap2_pm_debug) {
omap2_pm_dump(only_idle ? 2 : 1, 0, 0);
- sleep_time = omap2_read_32k_sync_counter();
+ getnstimeofday(&sleep_time);
}
omap2_sram_idle();
if (omap2_pm_debug) {
- unsigned long long tmp;
- u32 resume_time;
-
- resume_time = omap2_read_32k_sync_counter();
- tmp = resume_time - sleep_time;
- tmp *= 1000000;
- omap2_pm_dump(only_idle ? 2 : 1, 1, tmp / 32768);
+ struct timespec t;
+ struct timespec ts_delta;
+
+ getnstimeofday(&t);
+ ts_delta = timespec_sub(t, sleep_time);
+ omap2_pm_dump(only_idle ? 2 : 1, 1,
+ div_s64(timespec_to_ns(&ts_delta),
+ NSEC_PER_USEC));
}
}
@@ -250,6 +261,8 @@ static int omap2_can_sleep(void)
return 0;
if (omap_dma_running())
return 0;
+ if (!omap_serial_can_sleep())
+ return 0;
return 1;
}
@@ -517,8 +530,6 @@ int __init omap2_pm_init(void)
prcm_setup_regs();
- pm_init_serial_console();
-
/* Hack to prevent MPU retention when STI console is enabled. */
{
const struct omap_sti_console_config *sti;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 9c7b7be..6239bb9 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -29,6 +29,7 @@
#include <asm/arch/pm.h>
#include <asm/arch/clockdomain.h>
#include <asm/arch/powerdomain.h>
+#include <asm/arch/common.h>
#include "cm.h"
#include "cm-regbits-34xx.h"
@@ -66,6 +67,9 @@ static irqreturn_t prcm_interrupt_handler (int irq, void *dev_id)
u32 wkst, irqstatus_mpu;
u32 fclk, iclk;
+ /* Check if we woke up to serial console activity */
+ omap_serial_check_wakeup();
+
/* WKUP */
wkst = prm_read_mod_reg(WKUP_MOD, PM_WKST);
if (wkst) {
@@ -176,8 +180,14 @@ static void omap_sram_idle(void)
omap2_gpio_prepare_for_retention();
+ if (clocks_off_while_idle)
+ omap_serial_enable_clocks(0);
+
_omap_sram_idle(NULL, save_state, clocks_off_while_idle);
+ if (clocks_off_while_idle)
+ omap_serial_enable_clocks(1);
+
omap2_gpio_resume_after_retention();
}
@@ -205,8 +215,10 @@ static int omap3_fclks_active(void)
fck_per = cm_read_mod_reg(OMAP3430_PER_MOD,
CM_FCLKEN);
- if (clocks_off_while_idle)
+ if (clocks_off_while_idle) {
gpio_fclk_mask(&fck_per);
+ omap_serial_fclk_mask(&fck_core1, &fck_per);
+ }
if (fck_core1 | fck_core3 | fck_sgx | fck_dss |
fck_cam | fck_per | fck_usbhost)
@@ -222,6 +234,8 @@ static int omap3_can_sleep(void)
return 0;
if (atomic_read(&sleep_block) > 0)
return 0;
+ if (!omap_serial_can_sleep())
+ return 0;
return 1;
}
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
index b0fa582..905594a 100644
--- a/arch/arm/mach-omap2/serial.c
+++ b/arch/arm/mach-omap2/serial.c
@@ -22,9 +22,66 @@
#include <asm/arch/common.h>
#include <asm/arch/board.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/control.h>
+
+#include "prm.h"
+#include "pm.h"
+
+#define SERIAL_AWAKE_TIME 5
static struct clk *uart_ick[OMAP_MAX_NR_PORTS];
static struct clk *uart_fck[OMAP_MAX_NR_PORTS];
+static struct timespec omap_serial_next_sleep;
+
+#ifdef CONFIG_ARCH_OMAP24XX
+static const u32 omap2_uart_wk_st[OMAP_MAX_NR_PORTS] = {
+ OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKST1),
+ OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKST1),
+ OMAP2420_PRM_REGADDR(CORE_MOD, OMAP24XX_PM_WKST2)
+};
+static const u32 omap2_uart_wk_en[OMAP_MAX_NR_PORTS] = {
+ OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKEN1),
+ OMAP2420_PRM_REGADDR(CORE_MOD, PM_WKEN1),
+ OMAP2420_PRM_REGADDR(CORE_MOD, OMAP24XX_PM_WKEN2),
+};
+static const u32 omap2_uart_wk_bit[OMAP_MAX_NR_PORTS] = {
+ OMAP24XX_ST_UART1, OMAP24XX_ST_UART2, OMAP24XX_ST_UART3
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP34XX
+static const u32 omap3_uart_wk_st[OMAP_MAX_NR_PORTS] = {
+ OMAP34XX_PRM_REGADDR(CORE_MOD, PM_WKST1),
+ OMAP34XX_PRM_REGADDR(CORE_MOD, PM_WKST1),
+ OMAP34XX_PRM_REGADDR(OMAP3430_PER_MOD, PM_WKST1)
+};
+static const u32 omap3_uart_wk_en[OMAP_MAX_NR_PORTS] = {
+ OMAP34XX_PRM_REGADDR(CORE_MOD, PM_WKEN1),
+ OMAP34XX_PRM_REGADDR(CORE_MOD, PM_WKEN1),
+ OMAP34XX_PRM_REGADDR(OMAP3430_PER_MOD, PM_WKEN1)
+};
+static const u32 omap3_uart_wk_bit[OMAP_MAX_NR_PORTS] = {
+ OMAP3430_ST_UART1, OMAP3430_ST_UART2, OMAP3430_ST_UART3
+};
+#endif
+
+static const u32 *omap_uart_wk_st;
+static const u32 *omap_uart_wk_en;
+static const u32 *omap_uart_wk_bit;
+
+/* UART padconfig registers, these may differ if non-default padconfig
+ is used */
+#define CONTROL_PADCONF_UART1_RX 0x182
+#define CONTROL_PADCONF_UART2_RX 0x17A
+#define CONTROL_PADCONF_UART3_RX 0x19E
+#define PADCONF_WAKEUP_ST 0x8000
+
+static const u32 omap34xx_uart_padconf[OMAP_MAX_NR_PORTS] = {
+ CONTROL_PADCONF_UART1_RX,
+ CONTROL_PADCONF_UART2_RX,
+ CONTROL_PADCONF_UART3_RX
+};
static struct plat_serial8250_port serial_platform_data[] = {
{
@@ -83,6 +140,13 @@ static inline void __init omap_serial_reset(struct plat_serial8250_port *p)
serial_write_reg(p, UART_OMAP_SYSC, (0x02 << 3) | (1 << 2) | (1 << 0));
}
+static void omap_serial_kick(void)
+{
+ getnstimeofday(&omap_serial_next_sleep);
+ timespec_add_ns(&omap_serial_next_sleep, (s64)SERIAL_AWAKE_TIME *
+ NSEC_PER_SEC);
+}
+
void omap_serial_enable_clocks(int enable)
{
int i;
@@ -99,6 +163,67 @@ void omap_serial_enable_clocks(int enable)
}
}
+void omap_serial_fclk_mask(u32 *f1, u32 *f2)
+{
+ if (uart_ick[0])
+ *f1 &= ~(1 << uart_fck[0]->enable_bit);
+ if (uart_ick[1])
+ *f1 &= ~(1 << uart_fck[1]->enable_bit);
+ if (uart_ick[2])
+ *f2 &= ~(1 << uart_fck[2]->enable_bit);
+}
+
+void omap_serial_check_wakeup(void)
+{
+ int i;
+
+
+ for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
+ if (!uart_ick[i])
+ continue;
+
+ if (cpu_is_omap34xx())
+ if (omap_ctrl_readw(omap34xx_uart_padconf[i]) &
+ PADCONF_WAKEUP_ST) {
+ omap_serial_kick();
+ return;
+ }
+
+ if (__raw_readl(omap_uart_wk_st[i]) &
+ omap_uart_wk_bit[i]) {
+ omap_serial_kick();
+ return;
+ }
+ }
+}
+
+int omap_serial_can_sleep(void)
+{
+ int i;
+ struct timespec t;
+
+ struct plat_serial8250_port *p = serial_platform_data;
+
+ getnstimeofday(&t);
+
+ for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
+ if (!uart_ick[i])
+ continue;
+ /* Check if we have data in the transmit buffer */
+ if ((serial_read_reg(p + i, UART_LSR) &
+ (UART_LSR_TEMT|UART_LSR_THRE))
+ != (UART_LSR_TEMT|UART_LSR_THRE)) {
+ omap_serial_kick();
+ return 0;
+ }
+ }
+
+ if (timespec_compare(&t, &omap_serial_next_sleep) < 0)
+ return 0;
+
+ return 1;
+}
+
void __init omap_serial_init(void)
{
int i;
@@ -116,8 +241,25 @@ void __init omap_serial_init(void)
if (info == NULL)
return;
+#ifdef CONFIG_ARCH_OMAP24XX
+ if (cpu_is_omap242x()) {
+ omap_uart_wk_st = omap2_uart_wk_st;
+ omap_uart_wk_en = omap2_uart_wk_en;
+ omap_uart_wk_bit = omap2_uart_wk_bit;
+ }
+#endif
+
+#ifdef CONFIG_ARCH_OMAP34XX
+ if (cpu_is_omap34xx()) {
+ omap_uart_wk_st = omap3_uart_wk_st;
+ omap_uart_wk_en = omap3_uart_wk_en;
+ omap_uart_wk_bit = omap3_uart_wk_bit;
+ }
+#endif
+
for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
struct plat_serial8250_port *p = serial_platform_data + i;
+ u32 v;
if (!(info->enabled_uarts & (1 << i))) {
p->membase = NULL;
@@ -142,7 +284,13 @@ void __init omap_serial_init(void)
clk_enable(uart_fck[i]);
omap_serial_reset(p);
+
+ v = __raw_readl(omap_uart_wk_en[i]);
+ v |= omap_uart_wk_bit[i];
+ __raw_writel(v, omap_uart_wk_en[i]);
}
+
+ omap_serial_kick();
}
static struct platform_device serial_device = {
diff --git a/include/asm-arm/arch-omap/common.h b/include/asm-arm/arch-omap/common.h
index 7a48fc9..5d2033b 100644
--- a/include/asm-arm/arch-omap/common.h
+++ b/include/asm-arm/arch-omap/common.h
@@ -35,6 +35,9 @@ extern void omap_map_common_io(void);
extern struct sys_timer omap_timer;
extern void omap_serial_init(void);
extern void omap_serial_enable_clocks(int enable);
+extern int omap_serial_can_sleep(void);
+extern void omap_serial_fclk_mask(u32 *f1, u32 *f2);
+void omap_serial_check_wakeup(void);
#ifdef CONFIG_I2C_OMAP
extern int omap_register_i2c_bus(int bus_id, u32 clkrate,
struct i2c_board_info const *info,
--
1.5.5
--
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