diff options
Diffstat (limited to 'drivers/staging/olpc_dcon/olpc_dcon_xo_1.c')
| -rw-r--r-- | drivers/staging/olpc_dcon/olpc_dcon_xo_1.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c b/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c deleted file mode 100644 index 0c5a10c69401..000000000000 --- a/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c +++ /dev/null @@ -1,205 +0,0 @@ -/* - * 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, -}; |