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/*
* Mainly by David Woodhouse, somewhat modified by Jordan Crouse
*
* Copyright © 2006-2007 Red Hat, Inc.
* Copyright © 2006-2007 Advanced Micro Devices, Inc.
* Copyright © 2009 VIA Technology, Inc.
* Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
*
* This program is free software. You can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*/
#include <asm/olpc.h>
#include "olpc_dcon.h"
/* Base address of the GPIO registers */
static unsigned long gpio_base;
/*
* List of GPIOs that we care about:
* (in) GPIO12 -- DCONBLANK
* (in) GPIO[56] -- DCONSTAT[01]
* (out) GPIO11 -- DCONLOAD
*/
#define IN_GPIOS ((1<<5) | (1<<6) | (1<<7) | (1<<12))
#define OUT_GPIOS (1<<11)
static int dcon_init_xo_1(void)
{
unsigned long lo, hi;
unsigned char lob;
rdmsr(MSR_LBAR_GPIO, lo, hi);
/* Check the mask and whether GPIO is enabled (sanity check) */
if (hi != 0x0000f001) {
printk(KERN_ERR "GPIO not enabled -- cannot use DCON\n");
return -ENODEV;
}
/* Mask off the IO base address */
gpio_base = lo & 0x0000ff00;
/* Turn off the event enable for GPIO7 just to be safe */
outl(1 << (16+7), gpio_base + GPIOx_EVNT_EN);
/* Set the directions for the GPIO pins */
outl(OUT_GPIOS | (IN_GPIOS << 16), gpio_base + GPIOx_OUT_EN);
outl(IN_GPIOS | (OUT_GPIOS << 16), gpio_base + GPIOx_IN_EN);
/* Set up the interrupt mappings */
/* Set the IRQ to pair 2 */
geode_gpio_event_irq(OLPC_GPIO_DCON_IRQ, 2);
/* Enable group 2 to trigger the DCON interrupt */
geode_gpio_set_irq(2, DCON_IRQ);
/* Select edge level for interrupt (in PIC) */
lob = inb(0x4d0);
lob &= ~(1 << DCON_IRQ);
outb(lob, 0x4d0);
/* Register the interupt handler */
if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", &dcon_driver))
return -EIO;
/* Clear INV_EN for GPIO7 (DCONIRQ) */
outl((1<<(16+7)), gpio_base + GPIOx_INV_EN);
/* Enable filter for GPIO12 (DCONBLANK) */
outl(1<<(12), gpio_base + GPIOx_IN_FLTR_EN);
/* Disable filter for GPIO7 */
outl(1<<(16+7), gpio_base + GPIOx_IN_FLTR_EN);
/* Disable event counter for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
outl(1<<(16+7), gpio_base + GPIOx_EVNTCNT_EN);
outl(1<<(16+12), gpio_base + GPIOx_EVNTCNT_EN);
/* Add GPIO12 to the Filter Event Pair #7 */
outb(12, gpio_base + GPIO_FE7_SEL);
/* Turn off negative Edge Enable for GPIO12 */
outl(1<<(16+12), gpio_base + GPIOx_NEGEDGE_EN);
/* Enable negative Edge Enable for GPIO7 */
outl(1<<7, gpio_base + GPIOx_NEGEDGE_EN);
/* Zero the filter amount for Filter Event Pair #7 */
outw(0, gpio_base + GPIO_FLT7_AMNT);
/* Clear the negative edge status for GPIO7 and GPIO12 */
outl((1<<7) | (1<<12), gpio_base+0x4c);
/* 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 void dcon_wiggle_xo_1(void)
{
int x;
/*
* According to HiMax, when powering the DCON up we should hold
* SMB_DATA high for 8 SMB_CLK cycles. This will force the DCON
* state machine to reset to a (sane) initial state. Mitch Bradley
* did some testing and discovered that holding for 16 SMB_CLK cycles
* worked a lot more reliably, so that's what we do here.
*
* According to the cs5536 spec, to set GPIO14 to SMB_CLK we must
* simultaneously set AUX1 IN/OUT to GPIO14; ditto for SMB_DATA and
* GPIO15.
*/
geode_gpio_set(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_VAL);
geode_gpio_set(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_ENABLE);
geode_gpio_clear(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
geode_gpio_clear(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX2);
geode_gpio_clear(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
for (x = 0; x < 16; x++) {
udelay(5);
geode_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
udelay(5);
geode_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
}
udelay(5);
geode_gpio_set(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
geode_gpio_set(OLPC_GPIO_SMB_CLK|OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
}
static void dcon_set_dconload_1(int val)
{
if (val)
outl(1<<11, gpio_base + GPIOx_OUT_VAL);
else
outl(1<<(11 + 16), gpio_base + GPIOx_OUT_VAL);
}
static int dcon_read_status_xo_1(void)
{
int status = inl(gpio_base + GPIOx_READ_BACK) >> 5;
/* Clear the negative edge status for GPIO7 */
outl(1 << 7, gpio_base + GPIOx_NEGEDGE_STS);
return status;
}
static struct dcon_platform_data dcon_pdata_xo_1 = {
.init = dcon_init_xo_1,
.bus_stabilize_wiggle = dcon_wiggle_xo_1,
.set_dconload = dcon_set_dconload_1,
.read_status = dcon_read_status_xo_1,
};
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