> -----Original Message-----
> From: linux-omap-ow...@vger.kernel.org
> [mailto:linux-omap-ow...@vger.kernel.org] On Behalf Of Russ Dill
> Sent: Tuesday, April 28, 2009 12:58 AM
> To: linux-omap@vger.kernel.org
> Cc: Russ Dill
> Subject: [RFC] Allow disabling wakeup for serial ports,
> including during off mode.
>
> This patch causes the OMAP uarts to honor the sysfs
> power/wakeup file for
> IOPADs. Before the OMAP was always woken up from off mode on
> a rs232 signal
> change.
>
> This patch also creates a different platform device for each serial
> port so that the wakeup properties can be control per port.
>
> The patch is not in a complete state, but for my testing it
> was necessary
> to disable rs232 wakeup as allowing the signals to float in
> off mode by
> powering off the level converters was causing a wakeup event.
> ---
> arch/arm/mach-omap2/serial.c | 165
> ++++++++++++++++++++++++++++++++----------
> 1 files changed, 126 insertions(+), 39 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/serial.c
> b/arch/arm/mach-omap2/serial.c
> index 0762165..95b047a 100644
> --- a/arch/arm/mach-omap2/serial.c
> +++ b/arch/arm/mach-omap2/serial.c
> @@ -49,6 +49,7 @@ struct omap_uart_state {
>
> struct plat_serial8250_port *p;
> struct list_head node;
> + struct platform_device pdev;
>
> #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
> int context_valid;
> @@ -63,10 +64,9 @@ struct omap_uart_state {
> #endif
> };
>
> -static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS];
> static LIST_HEAD(uart_list);
>
> -static struct plat_serial8250_port serial_platform_data[] = {
> +static struct plat_serial8250_port serial_platform_data0[] = {
[sp] Is it necessary to split the array?
> {
> .membase = IO_ADDRESS(OMAP_UART1_BASE),
> .mapbase = OMAP_UART1_BASE,
> @@ -76,6 +76,12 @@ static struct plat_serial8250_port
> serial_platform_data[] = {
> .regshift = 2,
> .uartclk = OMAP24XX_BASE_BAUD * 16,
> }, {
> + .flags = 0
> + }
> +};
> +
> +static struct plat_serial8250_port serial_platform_data1[] = {
> + {
> .membase = IO_ADDRESS(OMAP_UART2_BASE),
> .mapbase = OMAP_UART2_BASE,
> .irq = 73,
> @@ -84,6 +90,12 @@ static struct plat_serial8250_port
> serial_platform_data[] = {
> .regshift = 2,
> .uartclk = OMAP24XX_BASE_BAUD * 16,
> }, {
> + .flags = 0
> + }
> +};
> +
> +static struct plat_serial8250_port serial_platform_data2[] = {
> + {
> .membase = IO_ADDRESS(OMAP_UART3_BASE),
> .mapbase = OMAP_UART3_BASE,
> .irq = 74,
> @@ -197,6 +209,40 @@ static inline void
> omap_uart_save_context(struct omap_uart_state *uart) {}
> static inline void omap_uart_restore_context(struct
> omap_uart_state *uart) {}
> #endif /* CONFIG_ARCH_OMAP3 */
>
> +static void omap_uart_enable_wakeup(struct omap_uart_state *uart)
> +{
> + /* Set wake-enable bit */
> + if (uart->wk_en && uart->wk_mask) {
> + u32 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 = omap_ctrl_readw(uart->padconf);
> + v |= OMAP3_PADCONF_WAKEUPENABLE0;
> + omap_ctrl_writew(v, uart->padconf);
> + }
> +}
> +
> +static void omap_uart_disable_wakeup(struct omap_uart_state *uart)
> +{
> + /* Clear wake-enable bit */
> + if (uart->wk_en && uart->wk_mask) {
> + u32 v = __raw_readl(uart->wk_en);
> + v &= ~uart->wk_mask;
> + __raw_writel(v, uart->wk_en);
> + }
> +
> + /* Ensure IOPAD wake-enables are cleared */
> + if (cpu_is_omap34xx() && uart->padconf) {
> + u16 v = omap_ctrl_readw(uart->padconf);
> + v &= ~OMAP3_PADCONF_WAKEUPENABLE0;
> + omap_ctrl_writew(v, uart->padconf);
> + }
> +}
> +
> static void omap_uart_smart_idle_enable(struct omap_uart_state *uart,
> int enable)
> {
> @@ -220,6 +266,11 @@ static inline void
> omap_uart_restore(struct omap_uart_state *uart)
>
> static inline void omap_uart_disable_clocks(struct
> omap_uart_state *uart)
> {
> + if (device_may_wakeup(&uart->pdev.dev))
> + omap_uart_enable_wakeup(uart);
> + else
> + omap_uart_disable_wakeup(uart);
> +
> if (!uart->clocked)
> return;
>
> @@ -290,6 +341,7 @@ void omap_uart_resume_idle(int num)
> if (__raw_readl(uart->wk_st) & uart->wk_mask)
> omap_uart_block_sleep(uart);
>
> + omap_uart_enable_wakeup(uart);
> return;
> }
> }
> @@ -300,6 +352,7 @@ void omap_uart_prepare_suspend(void)
> struct omap_uart_state *uart;
>
> list_for_each_entry(uart, &uart_list, node) {
> + omap_uart_enable_wakeup(uart);
> omap_uart_allow_sleep(uart);
> }
> }
> @@ -343,16 +396,13 @@ static irqreturn_t
> omap_uart_interrupt(int irq, void *dev_id)
> return IRQ_NONE;
> }
>
> -static u32 sleep_timeout = DEFAULT_TIMEOUT;
> -
> 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 = sleep_timeout;
> + uart->timeout = DEFAULT_TIMEOUT;
[sp] Why do we need a constant here?
> setup_timer(&uart->timer, omap_uart_idle_timer,
> (unsigned long) uart);
> mod_timer(&uart->timer, jiffies + uart->timeout);
> @@ -410,22 +460,6 @@ static void omap_uart_idle_init(struct
> omap_uart_state *uart)
> 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);
> @@ -450,23 +484,30 @@ static ssize_t
> sleep_timeout_show(struct kobject *kobj,
> struct kobj_attribute *attr,
> char *buf)
> {
> - return sprintf(buf, "%u\n", sleep_timeout / HZ);
> + struct device *dev = container_of(kobj, struct device, kobj);
> + struct platform_device *pdev = container_of(dev,
> + struct platform_device, dev);
> + struct omap_uart_state *uart = container_of(pdev,
> + struct omap_uart_state, pdev);
> + return sprintf(buf, "%u\n", uart->timeout / HZ);
> }
>
> static ssize_t sleep_timeout_store(struct kobject *kobj,
> struct kobj_attribute *attr,
> const char *buf, size_t n)
> {
> - struct omap_uart_state *uart;
> + struct device *dev = container_of(kobj, struct device, kobj);
> + struct platform_device *pdev = container_of(dev,
> + struct platform_device, dev);
> + struct omap_uart_state *uart = container_of(pdev,
> + struct omap_uart_state, pdev);
> unsigned int value;
>
> if (sscanf(buf, "%u", &value) != 1) {
> printk(KERN_ERR "sleep_timeout_store: Invalid value\n");
> return -EINVAL;
> }
> - sleep_timeout = value * HZ;
> - list_for_each_entry(uart, &uart_list, node)
> - uart->timeout = sleep_timeout;
> + uart->timeout = value * HZ;
> return n;
> }
>
> @@ -477,6 +518,34 @@ static struct kobj_attribute sleep_timeout_attr =
> static inline void omap_uart_idle_init(struct
> omap_uart_state *uart) {}
> #endif /* CONFIG_PM */
>
> +static struct omap_uart_state omap_uart[OMAP_MAX_NR_PORTS] = {
> + {
> + .pdev = {
> + .name = "serial8250",
> + .id = PLAT8250_DEV_PLATFORM,
> + .dev = {
> + .platform_data = serial_platform_data0,
> + },
> + },
> + }, {
> + .pdev = {
> + .name = "serial8250",
> + .id =
> PLAT8250_DEV_PLATFORM1,
> + .dev = {
> + .platform_data = serial_platform_data1,
> + },
> + },
> + }, {
> + .pdev = {
> + .name = "serial8250",
> + .id =
> PLAT8250_DEV_PLATFORM2,
> + .dev = {
> + .platform_data = serial_platform_data2,
> + },
> + },
> + },
> +};
> +
> void __init omap_serial_init(void)
> {
> int i;
> @@ -495,8 +564,8 @@ void __init omap_serial_init(void)
> return;
>
> 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];
> + struct plat_serial8250_port *p =
> uart->pdev.dev.platform_data;
>
> if (!(info->enabled_uarts & (1 << i))) {
> p->membase = NULL;
> @@ -532,25 +601,43 @@ void __init omap_serial_init(void)
> }
> }
>
> -static struct platform_device serial_device = {
> - .name = "serial8250",
> - .id = PLAT8250_DEV_PLATFORM,
> - .dev = {
> - .platform_data = serial_platform_data,
> - },
> -};
> -
> static int __init omap_init(void)
> {
> int ret;
> + int i;
>
> - ret = platform_device_register(&serial_device);
> + for (i = 0; i < ARRAY_SIZE(omap_uart); i++) {
> + ret = platform_device_register(&omap_uart[i].pdev);
> + if (ret < 0)
> + goto device_err;
> + if ((cpu_is_omap34xx() && omap_uart[i].padconf) ||
> + (omap_uart[i].wk_en && omap_uart[i].wk_mask)) {
> + printk(KERN_ERR "%s: Setting
> init_wakeup\n", __func__);
> +
> device_init_wakeup(&omap_uart[i].pdev.dev, true);
> + }
> + }
>
> #ifdef CONFIG_PM
> - if (!ret)
> - ret = sysfs_create_file(&serial_device.dev.kobj,
> + for (i = 0; i < ARRAY_SIZE(omap_uart); i++) {
> + ret = sysfs_create_file(&omap_uart[i].pdev.dev.kobj,
> &sleep_timeout_attr.attr);
> + if (ret < 0)
> + goto sysfs_err;
> + }
> +#endif
> + return ret;
> +
> +#ifdef CONFIG_PM
> +sysfs_err:
> + for (i--; i >= 0; i--)
> + sysfs_remove_file(&omap_uart[i].pdev.dev.kobj,
> + &sleep_timeout_attr.attr);
> + i = ARRAY_SIZE(omap_uart);
> #endif
> +
> +device_err:
> + for (i--; i >= 0; i--)
> + platform_device_unregister(&omap_uart[i].pdev);
> return ret;
> }
> arch_initcall(omap_init);
> --
> 1.6.0.4
>
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