--- /dev/null
+/*
+ * 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,
+};
projects / mv-sheeva.git / blobdiff