x86, olpc-xo1-sci: Add GPE handler and ebook switch functionality
The EC in the OLPC XO-1 delivers GPE events to provide various notifications. Add the basic code for GPE/EC event processing and enable the ebook switch, which can be used as a wakeup source. Signed-off-by: Daniel Drake <dsd@laptop.org> Link: http://lkml.kernel.org/r/1309019658-1712-8-git-send-email-dsd@laptop.org Acked-by: Andres Salomon <dilinger@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>hifive-unleashed-5.1
Daniel Drake
H. Peter Anvin
parent
bc4ecd5a5e
commit
7bc74b3df7
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@ -2087,7 +2087,9 @@ config OLPC_XO1_SCI
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select MFD_CORE
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---help---
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Add support for SCI-based features of the OLPC XO-1 laptop:
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- EC-driven system wakeups
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- Power button
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- Ebook switch
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endif # X86_32
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@ -111,6 +111,7 @@ extern int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
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#define EC_WRITE_SCI_MASK 0x1b
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#define EC_WAKE_UP_WLAN 0x24
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#define EC_WLAN_LEAVE_RESET 0x25
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#define EC_READ_EB_MODE 0x2a
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#define EC_SET_SCI_INHIBIT 0x32
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#define EC_SET_SCI_INHIBIT_RELEASE 0x34
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#define EC_WLAN_ENTER_RESET 0x35
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@ -144,7 +145,7 @@ extern int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
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#define OLPC_GPIO_SMB_CLK 14
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#define OLPC_GPIO_SMB_DATA 15
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#define OLPC_GPIO_WORKAUX geode_gpio(24)
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#define OLPC_GPIO_LID geode_gpio(26)
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#define OLPC_GPIO_ECSCI geode_gpio(27)
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#define OLPC_GPIO_LID 26
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#define OLPC_GPIO_ECSCI 27
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#endif /* _ASM_X86_OLPC_H */
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@ -12,12 +12,15 @@
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*/
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#include <linux/cs5535.h>
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#include <linux/device.h>
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#include <linux/gpio.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/mfd/core.h>
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#include <linux/suspend.h>
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#include <linux/workqueue.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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@ -28,8 +31,60 @@
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static unsigned long acpi_base;
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static struct input_dev *power_button_idev;
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static struct input_dev *ebook_switch_idev;
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static int sci_irq;
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/* Report current ebook switch state through input layer */
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static void send_ebook_state(void)
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{
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unsigned char state;
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if (olpc_ec_cmd(EC_READ_EB_MODE, NULL, 0, &state, 1)) {
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pr_err(PFX "failed to get ebook state\n");
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return;
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}
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input_report_switch(ebook_switch_idev, SW_TABLET_MODE, state);
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input_sync(ebook_switch_idev);
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}
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/*
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* Process all items in the EC's SCI queue.
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*
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* This is handled in a workqueue because olpc_ec_cmd can be slow (and
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* can even timeout).
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*
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* If propagate_events is false, the queue is drained without events being
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* generated for the interrupts.
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*/
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static void process_sci_queue(bool propagate_events)
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{
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int r;
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u16 data;
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do {
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r = olpc_ec_sci_query(&data);
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if (r || !data)
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break;
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pr_debug(PFX "SCI 0x%x received\n", data);
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if (data == EC_SCI_SRC_EBOOK && propagate_events)
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send_ebook_state();
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} while (data);
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if (r)
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pr_err(PFX "Failed to clear SCI queue");
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}
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static void process_sci_queue_work(struct work_struct *work)
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{
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process_sci_queue(true);
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}
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static DECLARE_WORK(sci_work, process_sci_queue_work);
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static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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@ -51,6 +106,11 @@ static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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input_sync(power_button_idev);
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}
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if (gpe & CS5536_GPIOM7_PME_FLAG) { /* EC GPIO */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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schedule_work(&sci_work);
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}
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return IRQ_HANDLED;
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}
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@ -60,6 +120,19 @@ static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
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olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
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else
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olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
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if (device_may_wakeup(&ebook_switch_idev->dev))
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olpc_ec_wakeup_set(EC_SCI_SRC_EBOOK);
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else
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olpc_ec_wakeup_clear(EC_SCI_SRC_EBOOK);
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return 0;
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}
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static int xo1_sci_resume(struct platform_device *pdev)
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{
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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return 0;
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}
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@ -104,6 +177,50 @@ static int __devinit setup_sci_interrupt(struct platform_device *pdev)
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return r;
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}
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static int __devinit setup_ec_sci(void)
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{
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int r;
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r = gpio_request(OLPC_GPIO_ECSCI, "OLPC-ECSCI");
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if (r)
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return r;
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gpio_direction_input(OLPC_GPIO_ECSCI);
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/* Clear pending EC SCI events */
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_NEGATIVE_EDGE_STS);
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_POSITIVE_EDGE_STS);
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/*
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* Enable EC SCI events, and map them to both a PME and the SCI
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* interrupt.
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*
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* Ordinarily, in addition to functioning as GPIOs, Geode GPIOs can
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* be mapped to regular interrupts *or* Geode-specific Power
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* Management Events (PMEs) - events that bring the system out of
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* suspend. In this case, we want both of those things - the system
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* wakeup, *and* the ability to get an interrupt when an event occurs.
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*
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* To achieve this, we map the GPIO to a PME, and then we use one
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* of the many generic knobs on the CS5535 PIC to additionally map the
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* PME to the regular SCI interrupt line.
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*/
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cs5535_gpio_set(OLPC_GPIO_ECSCI, GPIO_EVENTS_ENABLE);
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/* Set the SCI to cause a PME event on group 7 */
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cs5535_gpio_setup_event(OLPC_GPIO_ECSCI, 7, 1);
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/* And have group 7 also fire the SCI interrupt */
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cs5535_pic_unreqz_select_high(7, sci_irq);
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return 0;
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}
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static void free_ec_sci(void)
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{
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gpio_free(OLPC_GPIO_ECSCI);
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}
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static int __devinit setup_power_button(struct platform_device *pdev)
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{
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int r;
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@ -135,6 +252,37 @@ static void free_power_button(void)
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input_free_device(power_button_idev);
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}
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static int __devinit setup_ebook_switch(struct platform_device *pdev)
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{
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int r;
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ebook_switch_idev = input_allocate_device();
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if (!ebook_switch_idev)
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return -ENOMEM;
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ebook_switch_idev->name = "EBook Switch";
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ebook_switch_idev->phys = DRV_NAME "/input1";
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set_bit(EV_SW, ebook_switch_idev->evbit);
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set_bit(SW_TABLET_MODE, ebook_switch_idev->swbit);
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ebook_switch_idev->dev.parent = &pdev->dev;
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device_set_wakeup_capable(&ebook_switch_idev->dev, true);
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r = input_register_device(ebook_switch_idev);
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if (r) {
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dev_err(&pdev->dev, "failed to register ebook switch: %d\n", r);
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input_free_device(ebook_switch_idev);
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}
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return r;
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}
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static void free_ebook_switch(void)
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{
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input_unregister_device(ebook_switch_idev);
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input_free_device(ebook_switch_idev);
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}
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static int __devinit xo1_sci_probe(struct platform_device *pdev)
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{
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struct resource *res;
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@ -159,10 +307,39 @@ static int __devinit xo1_sci_probe(struct platform_device *pdev)
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if (r)
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return r;
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r = setup_ebook_switch(pdev);
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if (r)
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goto err_ebook;
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r = setup_ec_sci();
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if (r)
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goto err_ecsci;
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/* Enable PME generation for EC-generated events */
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outl(CS5536_GPIOM7_PME_EN, acpi_base + CS5536_PM_GPE0_EN);
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/* Clear pending events */
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outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
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process_sci_queue(false);
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/* Initial sync */
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send_ebook_state();
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r = setup_sci_interrupt(pdev);
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if (r)
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free_power_button();
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goto err_sci;
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/* Enable all EC events */
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olpc_ec_mask_write(EC_SCI_SRC_ALL);
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return r;
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err_sci:
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free_ec_sci();
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err_ecsci:
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free_ebook_switch();
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err_ebook:
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free_power_button();
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return r;
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}
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@ -170,6 +347,9 @@ static int __devexit xo1_sci_remove(struct platform_device *pdev)
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{
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mfd_cell_disable(pdev);
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free_irq(sci_irq, pdev);
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cancel_work_sync(&sci_work);
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free_ec_sci();
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free_ebook_switch();
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free_power_button();
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acpi_base = 0;
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return 0;
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@ -182,6 +362,7 @@ static struct platform_driver xo1_sci_driver = {
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.probe = xo1_sci_probe,
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.remove = __devexit_p(xo1_sci_remove),
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.suspend = xo1_sci_suspend,
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.resume = xo1_sci_resume,
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};
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static int __init xo1_sci_init(void)
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@ -11,6 +11,8 @@
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#ifndef _CS5535_H
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#define _CS5535_H
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#include <asm/msr.h>
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/* MSRs */
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#define MSR_GLIU_P2D_RO0 0x10000029
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@ -43,6 +45,18 @@
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#define MSR_GX_GLD_MSR_CONFIG 0xC0002001
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#define MSR_GX_MSR_PADSEL 0xC0002011
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static inline int cs5535_pic_unreqz_select_high(unsigned int group,
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unsigned int irq)
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{
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uint32_t lo, hi;
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rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
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lo &= ~(0xF << (group * 4));
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lo |= (irq & 0xF) << (group * 4);
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wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
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return 0;
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}
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/* PIC registers */
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#define CS5536_PIC_INT_SEL1 0x4d0
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#define CS5536_PIC_INT_SEL2 0x4d1
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@ -73,6 +87,7 @@
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#define CS5536_PM1_EN 0x02
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#define CS5536_PM1_CNT 0x08
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#define CS5536_PM_GPE0_STS 0x18
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#define CS5536_PM_GPE0_EN 0x1c
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/* CS5536_PM1_STS bits */
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#define CS5536_WAK_FLAG (1 << 15)
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@ -81,6 +96,13 @@
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/* CS5536_PM1_EN bits */
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#define CS5536_PM_PWRBTN (1 << 8)
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/* CS5536_PM_GPE0_STS bits */
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#define CS5536_GPIOM7_PME_FLAG (1 << 31)
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#define CS5536_GPIOM6_PME_FLAG (1 << 30)
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/* CS5536_PM_GPE0_EN bits */
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#define CS5536_GPIOM7_PME_EN (1 << 31)
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/* VSA2 magic values */
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#define VSA_VRC_INDEX 0xAC1C
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#define VSA_VRC_DATA 0xAC1E
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