diff options
Diffstat (limited to 'drivers/staging/olpc_dcon/olpc_dcon_xo_1_5.c')
| -rw-r--r-- | drivers/staging/olpc_dcon/olpc_dcon_xo_1_5.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/drivers/staging/olpc_dcon/olpc_dcon_xo_1_5.c b/drivers/staging/olpc_dcon/olpc_dcon_xo_1_5.c deleted file mode 100644 index 6a4d379c16a3..000000000000 --- a/drivers/staging/olpc_dcon/olpc_dcon_xo_1_5.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * Copyright (c) 2009,2010 One Laptop per Child - * - * 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/acpi.h> -#include <linux/delay.h> -#include <linux/gpio.h> -#include <asm/olpc.h> - -/* TODO: this eventually belongs in linux/vx855.h */ -#define NR_VX855_GPI 14 -#define NR_VX855_GPO 13 -#define NR_VX855_GPIO 15 - -#define VX855_GPI(n) (n) -#define VX855_GPO(n) (NR_VX855_GPI + (n)) -#define VX855_GPIO(n) (NR_VX855_GPI + NR_VX855_GPO + (n)) - -#include "olpc_dcon.h" - -/* Hardware setup on the XO 1.5: - * DCONLOAD connects to VX855_GPIO1 (not SMBCK2) - * DCONBLANK connects to VX855_GPIO8 (not SSPICLK) unused in driver - * DCONSTAT0 connects to VX855_GPI10 (not SSPISDI) - * DCONSTAT1 connects to VX855_GPI11 (not nSSPISS) - * DCONIRQ connects to VX855_GPIO12 - * DCONSMBDATA connects to VX855 graphics CRTSPD - * DCONSMBCLK connects to VX855 graphics CRTSPCLK - */ - -#define VX855_GENL_PURPOSE_OUTPUT 0x44c /* PMIO_Rx4c-4f */ -#define VX855_GPI_STATUS_CHG 0x450 /* PMIO_Rx50 */ -#define VX855_GPI_SCI_SMI 0x452 /* PMIO_Rx52 */ -#define BIT_GPIO12 0x40 - -#define PREFIX "OLPC DCON:" - -static void dcon_clear_irq(void) -{ - /* irq status will appear in PMIO_Rx50[6] (RW1C) on gpio12 */ - outb(BIT_GPIO12, VX855_GPI_STATUS_CHG); -} - -static int dcon_was_irq(void) -{ - u_int8_t tmp; - - /* irq status will appear in PMIO_Rx50[6] on gpio12 */ - tmp = inb(VX855_GPI_STATUS_CHG); - return !!(tmp & BIT_GPIO12); - - return 0; -} - -static int dcon_init_xo_1_5(struct dcon_priv *dcon) -{ - unsigned int irq; - - dcon_clear_irq(); - - /* set PMIO_Rx52[6] to enable SCI/SMI on gpio12 */ - outb(inb(VX855_GPI_SCI_SMI)|BIT_GPIO12, VX855_GPI_SCI_SMI); - - /* Determine the current state of DCONLOAD, likely set by firmware */ - /* GPIO1 */ - dcon->curr_src = (inl(VX855_GENL_PURPOSE_OUTPUT) & 0x1000) ? - DCON_SOURCE_CPU : DCON_SOURCE_DCON; - dcon->pending_src = dcon->curr_src; - - /* we're sharing the IRQ with ACPI */ - irq = acpi_gbl_FADT.sci_interrupt; - if (request_irq(irq, &dcon_interrupt, IRQF_SHARED, "DCON", dcon)) { - pr_err("DCON (IRQ%d) allocation failed\n", irq); - return 1; - } - - return 0; -} - -static void set_i2c_line(int sda, int scl) -{ - unsigned char tmp; - unsigned int port = 0x26; - - /* FIXME: This directly accesses the CRT GPIO controller !!! */ - outb(port, 0x3c4); - tmp = inb(0x3c5); - - if (scl) - tmp |= 0x20; - else - tmp &= ~0x20; - - if (sda) - tmp |= 0x10; - else - tmp &= ~0x10; - - tmp |= 0x01; - - outb(port, 0x3c4); - outb(tmp, 0x3c5); -} - - -static void dcon_wiggle_xo_1_5(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. - */ - set_i2c_line(1, 1); - - for (x = 0; x < 16; x++) { - udelay(5); - set_i2c_line(1, 0); - udelay(5); - set_i2c_line(1, 1); - } - udelay(5); - - /* set PMIO_Rx52[6] to enable SCI/SMI on gpio12 */ - outb(inb(VX855_GPI_SCI_SMI)|BIT_GPIO12, VX855_GPI_SCI_SMI); -} - -static void dcon_set_dconload_xo_1_5(int val) -{ - gpio_set_value(VX855_GPIO(1), val); -} - -static int dcon_read_status_xo_1_5(u8 *status) -{ - if (!dcon_was_irq()) - return -1; - - /* i believe this is the same as "inb(0x44b) & 3" */ - *status = gpio_get_value(VX855_GPI(10)); - *status |= gpio_get_value(VX855_GPI(11)) << 1; - - dcon_clear_irq(); - - return 0; -} - -struct dcon_platform_data dcon_pdata_xo_1_5 = { - .init = dcon_init_xo_1_5, - .bus_stabilize_wiggle = dcon_wiggle_xo_1_5, - .set_dconload = dcon_set_dconload_xo_1_5, - .read_status = dcon_read_status_xo_1_5, -}; |