b926d7695b
kernel compiles fine, but graphic support is broken to test new kernel version, change target/linux/olpc/Makefile from .23.16 to .24 SVN-Revision: 10493
824 lines
19 KiB
C
824 lines
19 KiB
C
/*
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* Mainly by David Woodhouse, somewhat modified by Jordan Crouse
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*
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* Copyright © 2006-2007 Red Hat, Inc.
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* Copyright © 2006-2007 Advanced Micro Devices, Inc.
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*
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* This program is free software. You can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/fb.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/i2c-id.h>
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#include <linux/pci.h>
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#include <linux/vt_kern.h>
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#include <linux/pci_ids.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/backlight.h>
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#include <linux/device.h>
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#include <asm/uaccess.h>
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#include <linux/ctype.h>
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#include <linux/reboot.h>
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#include <asm/tsc.h>
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#include <asm/olpc.h>
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#include "olpc_dcon.h"
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/* Module definitions */
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static int resumeline = 898;
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module_param(resumeline, int, 0444);
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static int noinit;
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module_param(noinit, int, 0444);
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/* Default off since it doesn't work on DCON ASIC in B-test OLPC board */
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static int useaa = 1;
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module_param(useaa, int, 0444);
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/* I2C structures */
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static struct i2c_driver dcon_driver;
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static struct i2c_client *dcon_client;
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/* Platform devices */
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static struct platform_device *dcon_device;
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/* Backlight device */
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static struct backlight_device *dcon_bl_dev;
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/* Base address of the GPIO registers */
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static unsigned long gpio_base;
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static struct fb_info *fbinfo;
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/* Current source, initialized at probe time */
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static int dcon_source;
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/* Desired source */
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static int dcon_pending;
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/* Current output type */
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static int dcon_output = DCON_OUTPUT_COLOR;
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/* Current sleep status (not yet implemented) */
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static int dcon_sleep_val = DCON_ACTIVE;
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/* Shadow register for the DCON_REG_MODE register */
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static unsigned short dcon_disp_mode;
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/* Variables used during switches */
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static int dcon_switched;
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static DECLARE_WAIT_QUEUE_HEAD(dcon_wait_queue);
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static unsigned short normal_i2c[] = { 0x0D, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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#define dcon_write(reg,val) i2c_smbus_write_word_data(dcon_client,reg,val)
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#define dcon_read(reg) i2c_smbus_read_word_data(dcon_client,reg)
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/* The current backlight value - this saves us some smbus traffic */
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static int bl_val = -1;
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/* ===== API functions - these are called by a variety of users ==== */
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/* Backlight notes - turning off the backlight enable bit in the DCON
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* doesn't save us any power over just pushing the BL to zero, so we
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* don't use that bit in this code.
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*/
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static int dcon_get_backlight(void)
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{
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if (dcon_client == NULL)
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return 0;
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if (bl_val == -1)
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bl_val = dcon_read(DCON_REG_BRIGHT) & 0x0F;
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return bl_val;
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}
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static void dcon_set_backlight(int level)
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{
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if (dcon_client == NULL)
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return;
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if (bl_val == (level & 0x0F))
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return;
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bl_val = level & 0x0F;
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dcon_write(DCON_REG_BRIGHT, bl_val);
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/* Purposely turn off the backlight when we go to level 0 */
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if (bl_val == 0) {
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dcon_disp_mode &= ~MODE_BL_ENABLE;
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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}
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else if (!(dcon_disp_mode & MODE_BL_ENABLE)) {
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dcon_disp_mode |= MODE_BL_ENABLE;
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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}
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}
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/* Set the output type to either color or mono */
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static int dcon_set_output(int arg)
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{
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if (dcon_output == arg)
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return 0;
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dcon_output = arg;
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if (arg == DCON_OUTPUT_MONO) {
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dcon_disp_mode &= ~(MODE_CSWIZZLE | MODE_COL_AA);
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dcon_disp_mode |= MODE_MONO_LUMA;
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}
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else {
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dcon_disp_mode &= ~(MODE_MONO_LUMA);
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dcon_disp_mode |= MODE_CSWIZZLE;
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if (useaa)
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dcon_disp_mode |= MODE_COL_AA;
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}
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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return 0;
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}
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/* For now, this will be really stupid - we need to address how
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* DCONLOAD works in a sleep and account for it accordingly
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*/
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static void dcon_sleep(int state)
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{
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/* Turn off the backlight and put the DCON to sleep */
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if (state == dcon_sleep_val)
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return;
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if (state == DCON_SLEEP) {
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dcon_disp_mode &= ~MODE_BL_ENABLE;
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dcon_disp_mode |= MODE_SLEEP;
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}
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else {
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/* Only re-enable the backlight if the backlight value is set */
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if (bl_val != 0)
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dcon_disp_mode |= MODE_BL_ENABLE;
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dcon_disp_mode &= ~MODE_SLEEP;
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}
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dcon_sleep_val = state;
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dcon_write(DCON_REG_MODE, dcon_disp_mode);
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/* We should turn off some stuff in the framebuffer - but what? */
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}
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/* Set the source of the display (CPU or DCON) */
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static void dcon_source_switch(struct work_struct *work)
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{
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DECLARE_WAITQUEUE(wait, current);
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int source = dcon_pending;
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if (dcon_source == source)
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return;
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dcon_switched = 0;
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switch (source) {
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case DCON_SOURCE_CPU:
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/* Enable the scanline interrupt bit */
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if (dcon_write(DCON_REG_MODE, dcon_disp_mode | MODE_SCAN_INT))
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printk(KERN_ERR "olpc-dcon: couldn't enable scanline interrupt!\n");
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else {
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/* Wait up to one second for the scanline interrupt */
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wait_event_timeout(dcon_wait_queue, dcon_switched == 1, HZ);
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}
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if (!dcon_switched)
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printk(KERN_ERR "olpc-dcon: Timeout entering CPU mode; expect a screen glitch.\n");
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/*
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* Ideally we'd like to disable interrupts here so that the
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* fb_powerup and DCON turn on happen at a known time value;
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* however, we can't do that right now with fb_set_suspend
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* messing with semaphores.
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*
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* For now, we just hope..
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*/
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if (fb_powerup(fbinfo)) {
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printk(KERN_ERR "olpc-dcon: Failed to enter CPU mode\n");
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dcon_pending = DCON_SOURCE_DCON;
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return;
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}
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/* And turn off the DCON */
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outl(1<<11, gpio_base + GPIOx_OUT_VAL);
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/* Turn off the scanline interrupt */
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if (dcon_write(DCON_REG_MODE, dcon_disp_mode))
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printk(KERN_ERR "olpc-dcon: couldn't disable scanline interrupt!\n");
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printk(KERN_INFO "olpc-dcon: The CPU has control\n");
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break;
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case DCON_SOURCE_DCON:
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{
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int t;
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add_wait_queue(&dcon_wait_queue, &wait);
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set_current_state(TASK_UNINTERRUPTIBLE);
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/* Clear GPIO11 (DCONLOAD) - this implies that the DCON is in
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control */
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outl(1 << (11 + 16), gpio_base + GPIOx_OUT_VAL);
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t = schedule_timeout(HZ/2);
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remove_wait_queue(&dcon_wait_queue, &wait);
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set_current_state(TASK_RUNNING);
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if (!dcon_switched)
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printk(KERN_ERR "olpc-dcon: Timeout entering DCON mode; expect a screen glitch.\n");
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/* Turn off the graphics engine completely */
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fb_powerdown(fbinfo);
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printk(KERN_INFO "olpc-dcon: The DCON has control\n");
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break;
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}
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default:
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BUG();
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}
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dcon_source = source;
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}
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static DECLARE_WORK(dcon_work, dcon_source_switch);
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static int dcon_set_source(int arg)
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{
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if (arg != DCON_SOURCE_CPU && arg != DCON_SOURCE_DCON)
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return -EINVAL;
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if (dcon_pending == arg)
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return 0;
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dcon_pending = arg;
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if ((dcon_source != arg) && !work_pending(&dcon_work))
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schedule_work(&dcon_work);
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return 0;
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}
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static int dcon_set_source_sync(int arg)
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{
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int ret = dcon_set_source(arg);
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if (!ret)
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flush_scheduled_work();
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return ret;
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}
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static int dconbl_set(struct backlight_device *dev) {
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int level = dev->props.brightness;
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if (dev->props.power != FB_BLANK_UNBLANK)
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level = 0;
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dcon_set_backlight(level);
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return 0;
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}
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static int dconbl_get(struct backlight_device *dev) {
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return dcon_get_backlight();
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}
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static ssize_t dcon_mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%4.4X\n", dcon_disp_mode);
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}
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static ssize_t dcon_sleep_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dcon_sleep_val);
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}
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static ssize_t /* __deprecated */ dcon_source_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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printk(KERN_WARNING "olpc-dcon: using deprecated sysfs 'source' interface; use 'freeze' instead!\n");
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return sprintf(buf, "%d\n", dcon_source);
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}
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static ssize_t dcon_freeze_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dcon_source == DCON_SOURCE_DCON ? 1 : 0);
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}
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static ssize_t dcon_output_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", dcon_output);
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}
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static ssize_t dcon_resumeline_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", resumeline);
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}
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static int _strtoul(const char *buf, int len, unsigned int *val)
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{
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char *endp;
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unsigned int output = simple_strtoul(buf, &endp, 0);
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int size = endp - buf;
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if (*endp && isspace(*endp))
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size++;
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if (size != len)
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return -EINVAL;
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*val = output;
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return 0;
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}
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static ssize_t dcon_output_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int output;
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int rc = -EINVAL;
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if (_strtoul(buf, count, &output))
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return -EINVAL;
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if (output == DCON_OUTPUT_COLOR || output == DCON_OUTPUT_MONO) {
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dcon_set_output(output);
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rc = count;
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}
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return rc;
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}
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static ssize_t /* __deprecated */ dcon_source_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int output;
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int rc = -EINVAL;
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printk(KERN_WARNING "olpc-dcon: using deprecated sysfs 'source' interface; use 'freeze' instead!\n");
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if (_strtoul(buf, count, &output))
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return -EINVAL;
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dcon_set_source(output);
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rc = count;
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return rc;
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}
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static ssize_t dcon_freeze_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int output;
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int rc = -EINVAL;
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if (_strtoul(buf, count, &output))
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return rc;
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dcon_set_source(output ? DCON_SOURCE_DCON : DCON_SOURCE_CPU);
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rc = count;
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return rc;
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}
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static ssize_t dcon_resumeline_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int rl;
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int rc = -EINVAL;
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if (_strtoul(buf, count, &rl))
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return rc;
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resumeline = rl;
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dcon_write(DCON_REG_SCAN_INT, resumeline);
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rc = count;
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return rc;
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}
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static ssize_t dcon_sleep_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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int output;
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if (_strtoul(buf, count, &output))
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return -EINVAL;
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dcon_sleep(output ? DCON_SLEEP : DCON_ACTIVE);
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return count;
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}
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static struct device_attribute dcon_device_files[] = {
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__ATTR(mode, 0444, dcon_mode_show, NULL),
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__ATTR(sleep, 0644, dcon_sleep_show, dcon_sleep_store),
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__ATTR(source, 0644, dcon_source_show, dcon_source_store),
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__ATTR(freeze, 0644, dcon_freeze_show, dcon_freeze_store),
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__ATTR(output, 0644, dcon_output_show, dcon_output_store),
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__ATTR(resumeline, 0644, dcon_resumeline_show, dcon_resumeline_store),
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};
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static struct backlight_ops dcon_bl_ops = {
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.get_brightness = dconbl_get,
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.update_status = dconbl_set
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};
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/* List of GPIOs that we care about:
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(in) GPIO12 -- DCONBLNK
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(in) GPIO[56] -- DCONSTAT[01]
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(out) GPIO11 -- DCONLOAD
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*/
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#define IN_GPIOS ((1<<5) | (1<<6) | (1<<7) | (1<<12))
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#define OUT_GPIOS (1<<11)
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static irqreturn_t dcon_interrupt(int, void *);
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static int dcon_request_irq(void)
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{
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unsigned long lo, hi;
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unsigned char lob;
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rdmsr(MSR_LBAR_GPIO, lo, hi);
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/* Check the mask and whether GPIO is enabled (sanity check) */
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if (hi != 0x0000f001) {
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printk(KERN_ERR "GPIO not enabled -- cannot use DCON\n");
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return -ENODEV;
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}
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/* Mask off the IO base address */
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gpio_base = lo & 0x0000ff00;
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/* Turn off the event enable for GPIO7 just to be safe */
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outl(1 << (16+7), gpio_base + GPIOx_EVNT_EN);
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/* Set the directions for the GPIO pins */
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outl(OUT_GPIOS | (IN_GPIOS << 16), gpio_base + GPIOx_OUT_EN);
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outl(IN_GPIOS | (OUT_GPIOS << 16), gpio_base + GPIOx_IN_EN);
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/* Set up the interrupt mappings */
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/* Set the IRQ to pair 2 */
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geode_gpio_event_irq(OLPC_GPIO_DCON_IRQ, 2);
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/* Enable group 2 to trigger the DCON interrupt */
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geode_gpio_set_irq(2, DCON_IRQ);
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/* Select edge level for interrupt (in PIC) */
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lob = inb(0x4d0);
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lob &= ~(1 << DCON_IRQ);
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outb(lob, 0x4d0);
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/* Register the interupt handler */
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if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", &dcon_driver))
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return -EIO;
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/* Clear INV_EN for GPIO7 (DCONIRQ) */
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outl((1<<(16+7)), gpio_base + GPIOx_INV_EN);
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/* Enable filter for GPIO12 (DCONBLANK) */
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outl(1<<(12), gpio_base + GPIOx_IN_FLTR_EN);
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/* Disable filter for GPIO7 */
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outl(1<<(16+7), gpio_base + GPIOx_IN_FLTR_EN);
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/* Disable event counter for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
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outl(1<<(16+7), gpio_base + GPIOx_EVNTCNT_EN);
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outl(1<<(16+12), gpio_base + GPIOx_EVNTCNT_EN);
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/* Add GPIO12 to the Filter Event Pair #7 */
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outb(12, gpio_base + GPIO_FE7_SEL);
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/* Turn off negative Edge Enable for GPIO12 */
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outl(1<<(16+12), gpio_base + GPIOx_NEGEDGE_EN);
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/* Enable negative Edge Enable for GPIO7 */
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outl(1<<7, gpio_base + GPIOx_NEGEDGE_EN);
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/* Zero the filter amount for Filter Event Pair #7 */
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outw(0, gpio_base + GPIO_FLT7_AMNT);
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/* Clear the negative edge status for GPIO7 and GPIO12 */
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outl((1<<7) | (1<<12), gpio_base+0x4c);
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|
|
|
/* FIXME: Clear the posiitive status as well, just to be sure */
|
|
outl((1<<7) | (1<<12), gpio_base+0x48);
|
|
|
|
/* Enable events for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
|
|
outl((1<<(7))|(1<<12), gpio_base + GPIOx_EVNT_EN);
|
|
|
|
/* Determine the current state by reading the GPIO bit */
|
|
/* Earlier stages of the boot process have established the state */
|
|
dcon_source = inl(gpio_base + GPIOx_OUT_VAL) & (1<<11)
|
|
? DCON_SOURCE_CPU
|
|
: DCON_SOURCE_DCON;
|
|
dcon_pending = dcon_source;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dcon_reboot_notify(struct notifier_block *nb, unsigned long foo, void *bar)
|
|
{
|
|
if (dcon_client == NULL)
|
|
return 0;
|
|
|
|
/* Turn off the DCON. Entirely. */
|
|
dcon_write(DCON_REG_MODE, 0x39);
|
|
dcon_write(DCON_REG_MODE, 0x32);
|
|
return 0;
|
|
}
|
|
|
|
static int dcon_conswitch_notify(struct notifier_block *nb,
|
|
unsigned long mode, void *dummy)
|
|
{
|
|
if (mode == CONSOLE_EVENT_SWITCH_TEXT)
|
|
dcon_sleep(DCON_ACTIVE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block dcon_nb = {
|
|
.notifier_call = dcon_reboot_notify,
|
|
.priority = -1,
|
|
};
|
|
|
|
static struct notifier_block dcon_console_nb = {
|
|
.notifier_call = dcon_conswitch_notify,
|
|
.priority = -1,
|
|
};
|
|
|
|
static int dcon_probe(struct i2c_adapter *adap, int addr, int kind)
|
|
{
|
|
struct i2c_client *client;
|
|
uint16_t ver;
|
|
int rc, i;
|
|
|
|
if (!olpc_has_dcon()) {
|
|
printk("olpc-dcon: No DCON is attached.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (num_registered_fb >= 1)
|
|
fbinfo = registered_fb[0];
|
|
|
|
if (adap->id != I2C_HW_SMBUS_SCX200) {
|
|
printk(KERN_ERR "olpc-dcon: Invalid I2C bus (%d not %d)\n",
|
|
adap->id, I2C_HW_SMBUS_SCX200);
|
|
return -ENXIO;
|
|
}
|
|
|
|
client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
|
|
if (client == NULL)
|
|
return -ENOMEM;
|
|
|
|
strncpy(client->name, "OLPC-DCON", I2C_NAME_SIZE);
|
|
client->addr = addr;
|
|
client->adapter = adap;
|
|
client->driver = &dcon_driver;
|
|
|
|
if ((rc = i2c_attach_client(client)) != 0) {
|
|
printk(KERN_ERR "olpc-dcon: Unable to attach the I2C client.\n");
|
|
goto eclient;
|
|
}
|
|
|
|
ver = i2c_smbus_read_word_data(client, DCON_REG_ID);
|
|
|
|
if ((ver >> 8) != 0xDC) {
|
|
printk(KERN_ERR "olpc-dcon: DCON ID not 0xDCxx: 0x%04x instead.\n", ver);
|
|
rc = -ENXIO;
|
|
goto ei2c;
|
|
}
|
|
|
|
if ((rc = dcon_request_irq())) {
|
|
printk(KERN_ERR "olpc-dcon: Unable to grab IRQ.\n");
|
|
goto ei2c;
|
|
}
|
|
|
|
if (ver < 0xdc02 && !noinit) {
|
|
/* Initialize the DCON registers */
|
|
|
|
/* Start with work-arounds for DCON ASIC */
|
|
i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
|
|
i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
|
|
i2c_smbus_write_word_data(client, 0x4b, 0x00cc);
|
|
i2c_smbus_write_word_data(client, 0x0b, 0x007a);
|
|
i2c_smbus_write_word_data(client, 0x36, 0x025c);
|
|
i2c_smbus_write_word_data(client, 0x37, 0x025e);
|
|
|
|
/* Initialise SDRAM */
|
|
|
|
i2c_smbus_write_word_data(client, 0x3b, 0x002b);
|
|
i2c_smbus_write_word_data(client, 0x41, 0x0101);
|
|
i2c_smbus_write_word_data(client, 0x42, 0x0101);
|
|
}
|
|
|
|
/* Colour swizzle, AA, no passthrough, backlight */
|
|
|
|
dcon_disp_mode = MODE_PASSTHRU | MODE_BL_ENABLE | MODE_CSWIZZLE;
|
|
if (useaa)
|
|
dcon_disp_mode |= MODE_COL_AA;
|
|
i2c_smbus_write_word_data(client, DCON_REG_MODE, dcon_disp_mode);
|
|
|
|
|
|
/* Set the scanline to interrupt on during resume */
|
|
|
|
i2c_smbus_write_word_data(client, DCON_REG_SCAN_INT, resumeline);
|
|
|
|
/* Add the DCON device */
|
|
|
|
dcon_device = platform_device_alloc("dcon", -1);
|
|
|
|
if (dcon_device == NULL) {
|
|
printk(KERN_ERR "dcon: Unable to create the DCON device\n");
|
|
rc = -ENOMEM;
|
|
goto eirq;
|
|
}
|
|
|
|
if ((rc = platform_device_add(dcon_device))) {
|
|
printk(KERN_ERR "dcon: Unable to add the DCON device\n");
|
|
goto edev;
|
|
}
|
|
|
|
for(i = 0; i < ARRAY_SIZE(dcon_device_files); i++)
|
|
device_create_file(&dcon_device->dev, &dcon_device_files[i]);
|
|
|
|
/* Add the backlight device for the DCON */
|
|
|
|
dcon_client = client;
|
|
|
|
dcon_bl_dev = backlight_device_register("dcon-bl", &dcon_device->dev,
|
|
NULL, &dcon_bl_ops);
|
|
|
|
if (IS_ERR(dcon_bl_dev)) {
|
|
printk(KERN_INFO "Could not register the backlight device for the DCON (%ld)\n", PTR_ERR(dcon_bl_dev));
|
|
dcon_bl_dev = NULL;
|
|
}
|
|
else {
|
|
dcon_bl_dev->props.max_brightness = 15;
|
|
dcon_bl_dev->props.power = FB_BLANK_UNBLANK;
|
|
dcon_bl_dev->props.brightness = dcon_get_backlight();
|
|
|
|
backlight_update_status(dcon_bl_dev);
|
|
}
|
|
|
|
register_reboot_notifier(&dcon_nb);
|
|
console_event_register(&dcon_console_nb);
|
|
|
|
printk(KERN_INFO "olpc-dcon: Discovered DCON version %x\n", ver & 0xFF);
|
|
|
|
return 0;
|
|
|
|
edev:
|
|
platform_device_unregister(dcon_device);
|
|
dcon_device = NULL;
|
|
eirq:
|
|
free_irq(DCON_IRQ, &dcon_driver);
|
|
ei2c:
|
|
i2c_detach_client(client);
|
|
eclient:
|
|
kfree(client);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int dcon_attach(struct i2c_adapter *adap)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_probe(adap, &addr_data, dcon_probe);
|
|
|
|
if (dcon_client == NULL)
|
|
printk(KERN_ERR "olpc-dcon: No DCON found on SMBus\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dcon_detach(struct i2c_client *client)
|
|
{
|
|
int rc;
|
|
dcon_client = NULL;
|
|
|
|
unregister_reboot_notifier(&dcon_nb);
|
|
console_event_unregister(&dcon_console_nb);
|
|
|
|
free_irq(DCON_IRQ, &dcon_driver);
|
|
|
|
if ((rc = i2c_detach_client(client)) == 0)
|
|
kfree(i2c_get_clientdata(client));
|
|
|
|
if (dcon_bl_dev != NULL)
|
|
backlight_device_unregister(dcon_bl_dev);
|
|
|
|
if (dcon_device != NULL)
|
|
platform_device_unregister(dcon_device);
|
|
cancel_work_sync(&dcon_work);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
static int dcon_suspend(struct i2c_client *client, pm_message_t state)
|
|
{
|
|
if (dcon_sleep_val != DCON_ACTIVE)
|
|
return 0;
|
|
|
|
/* Set up the DCON to have the source */
|
|
return dcon_set_source_sync(DCON_SOURCE_DCON);
|
|
}
|
|
|
|
static int dcon_resume(struct i2c_client *client)
|
|
{
|
|
int x;
|
|
if (dcon_sleep_val != DCON_ACTIVE)
|
|
return 0;
|
|
|
|
/* HACK: ensure the bus is stable */
|
|
do {
|
|
x = dcon_read(DCON_REG_ID);
|
|
} while (x < 0);
|
|
|
|
return dcon_set_source(DCON_SOURCE_CPU);
|
|
}
|
|
|
|
#endif
|
|
|
|
static irqreturn_t dcon_interrupt(int irq, void *id)
|
|
{
|
|
int status = inl(gpio_base + GPIOx_READ_BACK) >> 5;
|
|
|
|
/* Clear the negative edge status for GPIO7 */
|
|
outl(1 << 7, gpio_base + GPIOx_NEGEDGE_STS);
|
|
|
|
switch (status & 3) {
|
|
case 3:
|
|
printk(KERN_DEBUG "olpc-dcon: DCONLOAD_MISSED interrupt\n");
|
|
break;
|
|
case 2: /* switch to DCON mode */
|
|
case 1: /* switch to CPU mode */
|
|
dcon_switched = 1;
|
|
wake_up(&dcon_wait_queue);
|
|
break;
|
|
case 0:
|
|
printk(KERN_DEBUG "olpc-dcon: scanline interrupt w/CPU\n");
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct i2c_driver dcon_driver = {
|
|
.driver = {
|
|
.name = "OLPC-DCON",
|
|
},
|
|
.id = I2C_DRIVERID_DCON,
|
|
.attach_adapter = dcon_attach,
|
|
.detach_client = dcon_detach,
|
|
#ifdef CONFIG_PM
|
|
.suspend = dcon_suspend,
|
|
.resume = dcon_resume,
|
|
#endif
|
|
};
|
|
|
|
|
|
static int __init olpc_dcon_init(void)
|
|
{
|
|
i2c_add_driver(&dcon_driver);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit olpc_dcon_exit(void)
|
|
{
|
|
i2c_del_driver(&dcon_driver);
|
|
}
|
|
|
|
module_init(olpc_dcon_init);
|
|
module_exit(olpc_dcon_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|