Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | /*
* 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cs5535.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <asm/olpc.h>
#include "olpc_dcon.h"
static int dcon_init_xo_1(struct dcon_priv *dcon)
{
unsigned char lob;
if (gpio_request(OLPC_GPIO_DCON_STAT0, "OLPC-DCON")) {
pr_err("failed to request STAT0 GPIO\n");
return -EIO;
}
if (gpio_request(OLPC_GPIO_DCON_STAT1, "OLPC-DCON")) {
pr_err("failed to request STAT1 GPIO\n");
goto err_gp_stat1;
}
if (gpio_request(OLPC_GPIO_DCON_IRQ, "OLPC-DCON")) {
pr_err("failed to request IRQ GPIO\n");
goto err_gp_irq;
}
if (gpio_request(OLPC_GPIO_DCON_LOAD, "OLPC-DCON")) {
pr_err("failed to request LOAD GPIO\n");
goto err_gp_load;
}
if (gpio_request(OLPC_GPIO_DCON_BLANK, "OLPC-DCON")) {
pr_err("failed to request BLANK GPIO\n");
goto err_gp_blank;
}
/* Turn off the event enable for GPIO7 just to be safe */
cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE);
/*
* Determine the current state by reading the GPIO bit; earlier
* stages of the boot process have established the state.
*
* Note that we read GPIO_OUTPUT_VAL rather than GPIO_READ_BACK here;
* this is because OFW will disable input for the pin and set a value..
* READ_BACK will only contain a valid value if input is enabled and
* then a value is set. So, future readings of the pin can use
* READ_BACK, but the first one cannot. Awesome, huh?
*/
dcon->curr_src = cs5535_gpio_isset(OLPC_GPIO_DCON_LOAD, GPIO_OUTPUT_VAL)
? DCON_SOURCE_CPU
: DCON_SOURCE_DCON;
dcon->pending_src = dcon->curr_src;
/* Set the directions for the GPIO pins */
gpio_direction_input(OLPC_GPIO_DCON_STAT0);
gpio_direction_input(OLPC_GPIO_DCON_STAT1);
gpio_direction_input(OLPC_GPIO_DCON_IRQ);
gpio_direction_input(OLPC_GPIO_DCON_BLANK);
gpio_direction_output(OLPC_GPIO_DCON_LOAD,
dcon->curr_src == DCON_SOURCE_CPU);
/* Set up the interrupt mappings */
/* Set the IRQ to pair 2 */
cs5535_gpio_setup_event(OLPC_GPIO_DCON_IRQ, 2, 0);
/* Enable group 2 to trigger the DCON interrupt */
cs5535_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 interrupt handler */
if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", dcon)) {
pr_err("failed to request DCON's irq\n");
goto err_req_irq;
}
/* Clear INV_EN for GPIO7 (DCONIRQ) */
cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_INVERT);
/* Enable filter for GPIO12 (DCONBLANK) */
cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_FILTER);
/* Disable filter for GPIO7 */
cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_FILTER);
/* Disable event counter for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
cs5535_gpio_clear(OLPC_GPIO_DCON_IRQ, GPIO_INPUT_EVENT_COUNT);
cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_INPUT_EVENT_COUNT);
/* Add GPIO12 to the Filter Event Pair #7 */
cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_FE7_SEL);
/* Turn off negative Edge Enable for GPIO12 */
cs5535_gpio_clear(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_EN);
/* Enable negative Edge Enable for GPIO7 */
cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_EN);
/* Zero the filter amount for Filter Event Pair #7 */
cs5535_gpio_set(0, GPIO_FLTR7_AMOUNT);
/* Clear the negative edge status for GPIO7 and GPIO12 */
cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_STS);
cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_NEGATIVE_EDGE_STS);
/* FIXME: Clear the positive status as well, just to be sure */
cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_POSITIVE_EDGE_STS);
cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_POSITIVE_EDGE_STS);
/* Enable events for GPIO7 (DCONIRQ) and GPIO12 (DCONBLANK) */
cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_EVENTS_ENABLE);
cs5535_gpio_set(OLPC_GPIO_DCON_BLANK, GPIO_EVENTS_ENABLE);
return 0;
err_req_irq:
gpio_free(OLPC_GPIO_DCON_BLANK);
err_gp_blank:
gpio_free(OLPC_GPIO_DCON_LOAD);
err_gp_load:
gpio_free(OLPC_GPIO_DCON_IRQ);
err_gp_irq:
gpio_free(OLPC_GPIO_DCON_STAT1);
err_gp_stat1:
gpio_free(OLPC_GPIO_DCON_STAT0);
return -EIO;
}
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.
*/
cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_VAL);
cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_ENABLE);
cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_ENABLE);
cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX1);
cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX2);
cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX2);
cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_INPUT_AUX1);
cs5535_gpio_clear(OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
for (x = 0; x < 16; x++) {
udelay(5);
cs5535_gpio_clear(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
udelay(5);
cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_VAL);
}
udelay(5);
cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_OUTPUT_AUX1);
cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_OUTPUT_AUX1);
cs5535_gpio_set(OLPC_GPIO_SMB_CLK, GPIO_INPUT_AUX1);
cs5535_gpio_set(OLPC_GPIO_SMB_DATA, GPIO_INPUT_AUX1);
}
static void dcon_set_dconload_1(int val)
{
gpio_set_value(OLPC_GPIO_DCON_LOAD, val);
}
static int dcon_read_status_xo_1(u8 *status)
{
*status = gpio_get_value(OLPC_GPIO_DCON_STAT0);
*status |= gpio_get_value(OLPC_GPIO_DCON_STAT1) << 1;
/* Clear the negative edge status for GPIO7 */
cs5535_gpio_set(OLPC_GPIO_DCON_IRQ, GPIO_NEGATIVE_EDGE_STS);
return 0;
}
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,
};
|