2010-10-26 06:13:52 -07:00
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/****************************************************************************
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*
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* Driver for the IFX 6x60 spi modem.
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*
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* Copyright (C) 2008 Option International
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* Copyright (C) 2008 Filip Aben <f.aben@option.com>
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* Denis Joseph Barrow <d.barow@option.com>
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* Jan Dumon <j.dumon@option.com>
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*
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* Copyright (C) 2009, 2010 Intel Corp
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* Russ Gorby <richardx.r.gorby@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA
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*
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* Driver modified by Intel from Option gtm501l_spi.c
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*
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* Notes
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* o The driver currently assumes a single device only. If you need to
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* change this then look for saved_ifx_dev and add a device lookup
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* o The driver is intended to be big-endian safe but has never been
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* tested that way (no suitable hardware). There are a couple of FIXME
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* notes by areas that may need addressing
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* o Some of the GPIO naming/setup assumptions may need revisiting if
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* you need to use this driver for another platform.
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*
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*****************************************************************************/
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#include <linux/module.h>
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#include <linux/termios.h>
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#include <linux/tty.h>
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#include <linux/device.h>
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#include <linux/spi/spi.h>
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#include <linux/tty.h>
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#include <linux/kfifo.h>
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#include <linux/tty_flip.h>
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#include <linux/timer.h>
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#include <linux/serial.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/rfkill.h>
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#include <linux/fs.h>
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#include <linux/ip.h>
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#include <linux/dmapool.h>
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#include <linux/gpio.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/wait.h>
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#include <linux/tty.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/spi/ifx_modem.h>
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2010-11-12 03:46:23 -07:00
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#include <linux/delay.h>
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2010-10-26 06:13:52 -07:00
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#include "ifx6x60.h"
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#define IFX_SPI_MORE_MASK 0x10
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#define IFX_SPI_MORE_BIT 12 /* bit position in u16 */
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#define IFX_SPI_CTS_BIT 13 /* bit position in u16 */
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#define IFX_SPI_TTY_ID 0
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#define IFX_SPI_TIMEOUT_SEC 2
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#define IFX_SPI_HEADER_0 (-1)
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#define IFX_SPI_HEADER_F (-2)
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/* forward reference */
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static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
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/* local variables */
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static int spi_b16 = 1; /* 8 or 16 bit word length */
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static struct tty_driver *tty_drv;
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static struct ifx_spi_device *saved_ifx_dev;
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static struct lock_class_key ifx_spi_key;
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/* GPIO/GPE settings */
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/**
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* mrdy_set_high - set MRDY GPIO
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* @ifx: device we are controlling
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*
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*/
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static inline void mrdy_set_high(struct ifx_spi_device *ifx)
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{
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gpio_set_value(ifx->gpio.mrdy, 1);
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}
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/**
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* mrdy_set_low - clear MRDY GPIO
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* @ifx: device we are controlling
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*
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*/
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static inline void mrdy_set_low(struct ifx_spi_device *ifx)
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{
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gpio_set_value(ifx->gpio.mrdy, 0);
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}
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/**
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* ifx_spi_power_state_set
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* @ifx_dev: our SPI device
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* @val: bits to set
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*
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* Set bit in power status and signal power system if status becomes non-0
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*/
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static void
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ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
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{
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unsigned long flags;
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spin_lock_irqsave(&ifx_dev->power_lock, flags);
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/*
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* if power status is already non-0, just update, else
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* tell power system
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*/
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if (!ifx_dev->power_status)
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pm_runtime_get(&ifx_dev->spi_dev->dev);
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ifx_dev->power_status |= val;
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spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
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}
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/**
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* ifx_spi_power_state_clear - clear power bit
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* @ifx_dev: our SPI device
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* @val: bits to clear
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*
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* clear bit in power status and signal power system if status becomes 0
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*/
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static void
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ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
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{
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unsigned long flags;
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spin_lock_irqsave(&ifx_dev->power_lock, flags);
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if (ifx_dev->power_status) {
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ifx_dev->power_status &= ~val;
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if (!ifx_dev->power_status)
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pm_runtime_put(&ifx_dev->spi_dev->dev);
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}
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spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
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}
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/**
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* swap_buf
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* @buf: our buffer
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* @len : number of bytes (not words) in the buffer
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* @end: end of buffer
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*
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* Swap the contents of a buffer into big endian format
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*/
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static inline void swap_buf(u16 *buf, int len, void *end)
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{
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int n;
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len = ((len + 1) >> 1);
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if ((void *)&buf[len] > end) {
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pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
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&buf[len], end);
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return;
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}
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for (n = 0; n < len; n++) {
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*buf = cpu_to_be16(*buf);
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buf++;
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}
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}
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/**
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* mrdy_assert - assert MRDY line
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* @ifx_dev: our SPI device
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*
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* Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
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* now.
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*
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* FIXME: Can SRDY even go high as we are running this code ?
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*/
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static void mrdy_assert(struct ifx_spi_device *ifx_dev)
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{
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int val = gpio_get_value(ifx_dev->gpio.srdy);
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if (!val) {
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if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
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&ifx_dev->flags)) {
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ifx_dev->spi_timer.expires =
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jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
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add_timer(&ifx_dev->spi_timer);
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}
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}
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ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
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mrdy_set_high(ifx_dev);
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}
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/**
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* ifx_spi_hangup - hang up an IFX device
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* @ifx_dev: our SPI device
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*
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* Hang up the tty attached to the IFX device if one is currently
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* open. If not take no action
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*/
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static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
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{
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struct tty_port *pport = &ifx_dev->tty_port;
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struct tty_struct *tty = tty_port_tty_get(pport);
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if (tty) {
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tty_hangup(tty);
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tty_kref_put(tty);
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}
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}
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/**
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* ifx_spi_timeout - SPI timeout
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* @arg: our SPI device
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*
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* The SPI has timed out: hang up the tty. Users will then see a hangup
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* and error events.
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*/
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static void ifx_spi_timeout(unsigned long arg)
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{
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struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
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dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
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ifx_spi_ttyhangup(ifx_dev);
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mrdy_set_low(ifx_dev);
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clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
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}
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/* char/tty operations */
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/**
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* ifx_spi_tiocmget - get modem lines
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* @tty: our tty device
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* @filp: file handle issuing the request
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*
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* Map the signal state into Linux modem flags and report the value
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* in Linux terms
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*/
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static int ifx_spi_tiocmget(struct tty_struct *tty, struct file *filp)
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{
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unsigned int value;
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struct ifx_spi_device *ifx_dev = tty->driver_data;
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value =
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(test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
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(test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
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(test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
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(test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
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(test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
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(test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
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return value;
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}
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/**
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* ifx_spi_tiocmset - set modem bits
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* @tty: the tty structure
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* @filp: file handle issuing the request
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* @set: bits to set
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* @clear: bits to clear
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*
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* The IFX6x60 only supports DTR and RTS. Set them accordingly
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* and flag that an update to the modem is needed.
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*
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* FIXME: do we need to kick the tranfers when we do this ?
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*/
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static int ifx_spi_tiocmset(struct tty_struct *tty, struct file *filp,
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unsigned int set, unsigned int clear)
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{
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struct ifx_spi_device *ifx_dev = tty->driver_data;
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if (set & TIOCM_RTS)
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set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
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if (set & TIOCM_DTR)
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set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
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if (clear & TIOCM_RTS)
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clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
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if (clear & TIOCM_DTR)
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clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
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set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
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return 0;
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}
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/**
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* ifx_spi_open - called on tty open
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* @tty: our tty device
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* @filp: file handle being associated with the tty
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*
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* Open the tty interface. We let the tty_port layer do all the work
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* for us.
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*
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* FIXME: Remove single device assumption and saved_ifx_dev
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*/
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static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
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{
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return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
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}
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/**
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* ifx_spi_close - called when our tty closes
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* @tty: the tty being closed
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* @filp: the file handle being closed
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*
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* Perform the close of the tty. We use the tty_port layer to do all
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* our hard work.
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*/
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static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
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{
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struct ifx_spi_device *ifx_dev = tty->driver_data;
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tty_port_close(&ifx_dev->tty_port, tty, filp);
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/* FIXME: should we do an ifx_spi_reset here ? */
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}
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/**
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* ifx_decode_spi_header - decode received header
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* @buffer: the received data
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* @length: decoded length
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* @more: decoded more flag
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* @received_cts: status of cts we received
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*
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* Note how received_cts is handled -- if header is all F it is left
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* the same as it was, if header is all 0 it is set to 0 otherwise it is
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* taken from the incoming header.
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*
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* FIXME: endianness
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*/
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static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
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unsigned char *more, unsigned char *received_cts)
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{
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u16 h1;
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u16 h2;
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u16 *in_buffer = (u16 *)buffer;
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h1 = *in_buffer;
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h2 = *(in_buffer+1);
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if (h1 == 0 && h2 == 0) {
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*received_cts = 0;
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return IFX_SPI_HEADER_0;
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} else if (h1 == 0xffff && h2 == 0xffff) {
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/* spi_slave_cts remains as it was */
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return IFX_SPI_HEADER_F;
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}
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*length = h1 & 0xfff; /* upper bits of byte are flags */
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*more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
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*received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
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return 0;
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}
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/**
|
|
|
|
* ifx_setup_spi_header - set header fields
|
|
|
|
* @txbuffer: pointer to start of SPI buffer
|
|
|
|
* @tx_count: bytes
|
|
|
|
* @more: indicate if more to follow
|
|
|
|
*
|
|
|
|
* Format up an SPI header for a transfer
|
|
|
|
*
|
|
|
|
* FIXME: endianness?
|
|
|
|
*/
|
|
|
|
static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
|
|
|
|
unsigned char more)
|
|
|
|
{
|
|
|
|
*(u16 *)(txbuffer) = tx_count;
|
|
|
|
*(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
|
|
|
|
txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_wakeup_serial - SPI space made
|
|
|
|
* @port_data: our SPI device
|
|
|
|
*
|
|
|
|
* We have emptied the FIFO enough that we want to get more data
|
|
|
|
* queued into it. Poke the line discipline via tty_wakeup so that
|
|
|
|
* it will feed us more bits
|
|
|
|
*/
|
|
|
|
static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
struct tty_struct *tty;
|
|
|
|
|
|
|
|
tty = tty_port_tty_get(&ifx_dev->tty_port);
|
|
|
|
if (!tty)
|
|
|
|
return;
|
|
|
|
tty_wakeup(tty);
|
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_prepare_tx_buffer - prepare transmit frame
|
|
|
|
* @ifx_dev: our SPI device
|
|
|
|
*
|
|
|
|
* The transmit buffr needs a header and various other bits of
|
|
|
|
* information followed by as much data as we can pull from the FIFO
|
|
|
|
* and transfer. This function formats up a suitable buffer in the
|
|
|
|
* ifx_dev->tx_buffer
|
|
|
|
*
|
|
|
|
* FIXME: performance - should we wake the tty when the queue is half
|
|
|
|
* empty ?
|
|
|
|
*/
|
|
|
|
static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
int temp_count;
|
|
|
|
int queue_length;
|
|
|
|
int tx_count;
|
|
|
|
unsigned char *tx_buffer;
|
|
|
|
|
|
|
|
tx_buffer = ifx_dev->tx_buffer;
|
|
|
|
memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
|
|
|
|
|
|
|
|
/* make room for required SPI header */
|
|
|
|
tx_buffer += IFX_SPI_HEADER_OVERHEAD;
|
|
|
|
tx_count = IFX_SPI_HEADER_OVERHEAD;
|
|
|
|
|
|
|
|
/* clear to signal no more data if this turns out to be the
|
|
|
|
* last buffer sent in a sequence */
|
|
|
|
ifx_dev->spi_more = 0;
|
|
|
|
|
|
|
|
/* if modem cts is set, just send empty buffer */
|
|
|
|
if (!ifx_dev->spi_slave_cts) {
|
|
|
|
/* see if there's tx data */
|
|
|
|
queue_length = kfifo_len(&ifx_dev->tx_fifo);
|
|
|
|
if (queue_length != 0) {
|
|
|
|
/* data to mux -- see if there's room for it */
|
|
|
|
temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
|
|
|
|
temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
|
|
|
|
tx_buffer, temp_count,
|
|
|
|
&ifx_dev->fifo_lock);
|
|
|
|
|
|
|
|
/* update buffer pointer and data count in message */
|
|
|
|
tx_buffer += temp_count;
|
|
|
|
tx_count += temp_count;
|
|
|
|
if (temp_count == queue_length)
|
|
|
|
/* poke port to get more data */
|
|
|
|
ifx_spi_wakeup_serial(ifx_dev);
|
|
|
|
else /* more data in port, use next SPI message */
|
|
|
|
ifx_dev->spi_more = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* have data and info for header -- set up SPI header in buffer */
|
|
|
|
/* spi header needs payload size, not entire buffer size */
|
|
|
|
ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
|
|
|
|
tx_count-IFX_SPI_HEADER_OVERHEAD,
|
|
|
|
ifx_dev->spi_more);
|
|
|
|
/* swap actual data in the buffer */
|
|
|
|
swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
|
|
|
|
&ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
|
|
|
|
return tx_count;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_write - line discipline write
|
|
|
|
* @tty: our tty device
|
|
|
|
* @buf: pointer to buffer to write (kernel space)
|
|
|
|
* @count: size of buffer
|
|
|
|
*
|
|
|
|
* Write the characters we have been given into the FIFO. If the device
|
|
|
|
* is not active then activate it, when the SRDY line is asserted back
|
|
|
|
* this will commence I/O
|
|
|
|
*/
|
|
|
|
static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
|
|
|
|
int count)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = tty->driver_data;
|
|
|
|
unsigned char *tmp_buf = (unsigned char *)buf;
|
|
|
|
int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
|
|
|
|
&ifx_dev->fifo_lock);
|
|
|
|
mrdy_assert(ifx_dev);
|
|
|
|
return tx_count;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_chars_in_buffer - line discipline helper
|
|
|
|
* @tty: our tty device
|
|
|
|
*
|
|
|
|
* Report how much data we can accept before we drop bytes. As we use
|
|
|
|
* a simple FIFO this is nice and easy.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_write_room(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = tty->driver_data;
|
|
|
|
return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_chars_in_buffer - line discipline helper
|
|
|
|
* @tty: our tty device
|
|
|
|
*
|
|
|
|
* Report how many characters we have buffered. In our case this is the
|
|
|
|
* number of bytes sitting in our transmit FIFO.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = tty->driver_data;
|
|
|
|
return kfifo_len(&ifx_dev->tx_fifo);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_port_hangup
|
|
|
|
* @port: our tty port
|
|
|
|
*
|
|
|
|
* tty port hang up. Called when tty_hangup processing is invoked either
|
|
|
|
* by loss of carrier, or by software (eg vhangup). Serialized against
|
|
|
|
* activate/shutdown by the tty layer.
|
|
|
|
*/
|
|
|
|
static void ifx_spi_hangup(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = tty->driver_data;
|
|
|
|
tty_port_hangup(&ifx_dev->tty_port);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_port_activate
|
|
|
|
* @port: our tty port
|
|
|
|
*
|
|
|
|
* tty port activate method - called for first open. Serialized
|
|
|
|
* with hangup and shutdown by the tty layer.
|
|
|
|
*/
|
|
|
|
static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev =
|
|
|
|
container_of(port, struct ifx_spi_device, tty_port);
|
|
|
|
|
|
|
|
/* clear any old data; can't do this in 'close' */
|
|
|
|
kfifo_reset(&ifx_dev->tx_fifo);
|
|
|
|
|
|
|
|
/* put port data into this tty */
|
|
|
|
tty->driver_data = ifx_dev;
|
|
|
|
|
|
|
|
/* allows flip string push from int context */
|
|
|
|
tty->low_latency = 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_port_shutdown
|
|
|
|
* @port: our tty port
|
|
|
|
*
|
|
|
|
* tty port shutdown method - called for last port close. Serialized
|
|
|
|
* with hangup and activate by the tty layer.
|
|
|
|
*/
|
|
|
|
static void ifx_port_shutdown(struct tty_port *port)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev =
|
|
|
|
container_of(port, struct ifx_spi_device, tty_port);
|
|
|
|
|
|
|
|
mrdy_set_low(ifx_dev);
|
|
|
|
clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
|
|
|
|
tasklet_kill(&ifx_dev->io_work_tasklet);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct tty_port_operations ifx_tty_port_ops = {
|
|
|
|
.activate = ifx_port_activate,
|
|
|
|
.shutdown = ifx_port_shutdown,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct tty_operations ifx_spi_serial_ops = {
|
|
|
|
.open = ifx_spi_open,
|
|
|
|
.close = ifx_spi_close,
|
|
|
|
.write = ifx_spi_write,
|
|
|
|
.hangup = ifx_spi_hangup,
|
|
|
|
.write_room = ifx_spi_write_room,
|
|
|
|
.chars_in_buffer = ifx_spi_chars_in_buffer,
|
|
|
|
.tiocmget = ifx_spi_tiocmget,
|
|
|
|
.tiocmset = ifx_spi_tiocmset,
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_insert_fip_string - queue received data
|
|
|
|
* @ifx_ser: our SPI device
|
|
|
|
* @chars: buffer we have received
|
|
|
|
* @size: number of chars reeived
|
|
|
|
*
|
|
|
|
* Queue bytes to the tty assuming the tty side is currently open. If
|
|
|
|
* not the discard the data.
|
|
|
|
*/
|
|
|
|
static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
|
|
|
|
unsigned char *chars, size_t size)
|
|
|
|
{
|
|
|
|
struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
|
|
|
|
if (!tty)
|
|
|
|
return;
|
|
|
|
tty_insert_flip_string(tty, chars, size);
|
|
|
|
tty_flip_buffer_push(tty);
|
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_complete - SPI transfer completed
|
|
|
|
* @ctx: our SPI device
|
|
|
|
*
|
|
|
|
* An SPI transfer has completed. Process any received data and kick off
|
|
|
|
* any further transmits we can commence.
|
|
|
|
*/
|
|
|
|
static void ifx_spi_complete(void *ctx)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = ctx;
|
|
|
|
struct tty_struct *tty;
|
|
|
|
struct tty_ldisc *ldisc = NULL;
|
|
|
|
int length;
|
|
|
|
int actual_length;
|
|
|
|
unsigned char more;
|
|
|
|
unsigned char cts;
|
|
|
|
int local_write_pending = 0;
|
|
|
|
int queue_length;
|
|
|
|
int srdy;
|
|
|
|
int decode_result;
|
|
|
|
|
|
|
|
mrdy_set_low(ifx_dev);
|
|
|
|
|
|
|
|
if (!ifx_dev->spi_msg.status) {
|
|
|
|
/* check header validity, get comm flags */
|
|
|
|
swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
|
|
|
|
&ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
|
|
|
|
decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
|
|
|
|
&length, &more, &cts);
|
|
|
|
if (decode_result == IFX_SPI_HEADER_0) {
|
|
|
|
dev_dbg(&ifx_dev->spi_dev->dev,
|
|
|
|
"ignore input: invalid header 0");
|
|
|
|
ifx_dev->spi_slave_cts = 0;
|
|
|
|
goto complete_exit;
|
|
|
|
} else if (decode_result == IFX_SPI_HEADER_F) {
|
|
|
|
dev_dbg(&ifx_dev->spi_dev->dev,
|
|
|
|
"ignore input: invalid header F");
|
|
|
|
goto complete_exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
ifx_dev->spi_slave_cts = cts;
|
|
|
|
|
|
|
|
actual_length = min((unsigned int)length,
|
|
|
|
ifx_dev->spi_msg.actual_length);
|
|
|
|
swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
|
|
|
|
actual_length,
|
|
|
|
&ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
|
|
|
|
ifx_spi_insert_flip_string(
|
|
|
|
ifx_dev,
|
|
|
|
ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
|
|
|
|
(size_t)actual_length);
|
|
|
|
} else {
|
|
|
|
dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
|
|
|
|
ifx_dev->spi_msg.status);
|
|
|
|
}
|
|
|
|
|
|
|
|
complete_exit:
|
|
|
|
if (ifx_dev->write_pending) {
|
|
|
|
ifx_dev->write_pending = 0;
|
|
|
|
local_write_pending = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
|
|
|
|
|
|
|
|
queue_length = kfifo_len(&ifx_dev->tx_fifo);
|
|
|
|
srdy = gpio_get_value(ifx_dev->gpio.srdy);
|
|
|
|
if (!srdy)
|
|
|
|
ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
|
|
|
|
|
|
|
|
/* schedule output if there is more to do */
|
|
|
|
if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
|
|
|
|
tasklet_schedule(&ifx_dev->io_work_tasklet);
|
|
|
|
else {
|
|
|
|
if (more || ifx_dev->spi_more || queue_length > 0 ||
|
|
|
|
local_write_pending) {
|
|
|
|
if (ifx_dev->spi_slave_cts) {
|
|
|
|
if (more)
|
|
|
|
mrdy_assert(ifx_dev);
|
|
|
|
} else
|
|
|
|
mrdy_assert(ifx_dev);
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* poke line discipline driver if any for more data
|
|
|
|
* may or may not get more data to write
|
|
|
|
* for now, say not busy
|
|
|
|
*/
|
|
|
|
ifx_spi_power_state_clear(ifx_dev,
|
|
|
|
IFX_SPI_POWER_DATA_PENDING);
|
|
|
|
tty = tty_port_tty_get(&ifx_dev->tty_port);
|
|
|
|
if (tty) {
|
|
|
|
ldisc = tty_ldisc_ref(tty);
|
|
|
|
if (ldisc) {
|
|
|
|
ldisc->ops->write_wakeup(tty);
|
|
|
|
tty_ldisc_deref(ldisc);
|
|
|
|
}
|
|
|
|
tty_kref_put(tty);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spio_io - I/O tasklet
|
|
|
|
* @data: our SPI device
|
|
|
|
*
|
|
|
|
* Queue data for transmission if possible and then kick off the
|
|
|
|
* transfer.
|
|
|
|
*/
|
|
|
|
static void ifx_spi_io(unsigned long data)
|
|
|
|
{
|
|
|
|
int retval;
|
|
|
|
struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
|
|
|
|
|
|
|
|
if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
|
|
|
|
if (ifx_dev->gpio.unack_srdy_int_nb > 0)
|
|
|
|
ifx_dev->gpio.unack_srdy_int_nb--;
|
|
|
|
|
|
|
|
ifx_spi_prepare_tx_buffer(ifx_dev);
|
|
|
|
|
|
|
|
spi_message_init(&ifx_dev->spi_msg);
|
|
|
|
INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
|
|
|
|
|
|
|
|
ifx_dev->spi_msg.context = ifx_dev;
|
|
|
|
ifx_dev->spi_msg.complete = ifx_spi_complete;
|
|
|
|
|
|
|
|
/* set up our spi transfer */
|
|
|
|
/* note len is BYTES, not transfers */
|
|
|
|
ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
|
|
|
|
ifx_dev->spi_xfer.cs_change = 0;
|
|
|
|
ifx_dev->spi_xfer.speed_hz = 12500000;
|
|
|
|
/* ifx_dev->spi_xfer.speed_hz = 390625; */
|
|
|
|
ifx_dev->spi_xfer.bits_per_word = spi_b16 ? 16 : 8;
|
|
|
|
|
|
|
|
ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
|
|
|
|
ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* setup dma pointers
|
|
|
|
*/
|
|
|
|
if (ifx_dev->is_6160) {
|
|
|
|
ifx_dev->spi_msg.is_dma_mapped = 1;
|
|
|
|
ifx_dev->tx_dma = ifx_dev->tx_bus;
|
|
|
|
ifx_dev->rx_dma = ifx_dev->rx_bus;
|
|
|
|
ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
|
|
|
|
ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
|
|
|
|
} else {
|
|
|
|
ifx_dev->spi_msg.is_dma_mapped = 0;
|
|
|
|
ifx_dev->tx_dma = (dma_addr_t)0;
|
|
|
|
ifx_dev->rx_dma = (dma_addr_t)0;
|
|
|
|
ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
|
|
|
|
ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
|
|
|
|
}
|
|
|
|
|
|
|
|
spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
|
|
|
|
|
|
|
|
/* Assert MRDY. This may have already been done by the write
|
|
|
|
* routine.
|
|
|
|
*/
|
|
|
|
mrdy_assert(ifx_dev);
|
|
|
|
|
|
|
|
retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
|
|
|
|
if (retval) {
|
|
|
|
clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
|
|
|
|
&ifx_dev->flags);
|
|
|
|
tasklet_schedule(&ifx_dev->io_work_tasklet);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
ifx_dev->write_pending = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_free_port - free up the tty side
|
|
|
|
* @ifx_dev: IFX device going away
|
|
|
|
*
|
|
|
|
* Unregister and free up a port when the device goes away
|
|
|
|
*/
|
|
|
|
static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
if (ifx_dev->tty_dev)
|
|
|
|
tty_unregister_device(tty_drv, ifx_dev->minor);
|
|
|
|
kfifo_free(&ifx_dev->tx_fifo);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_create_port - create a new port
|
|
|
|
* @ifx_dev: our spi device
|
|
|
|
*
|
|
|
|
* Allocate and initialise the tty port that goes with this interface
|
|
|
|
* and add it to the tty layer so that it can be opened.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
struct tty_port *pport = &ifx_dev->tty_port;
|
|
|
|
|
|
|
|
spin_lock_init(&ifx_dev->fifo_lock);
|
|
|
|
lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
|
|
|
|
&ifx_spi_key, 0);
|
|
|
|
|
|
|
|
if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
pport->ops = &ifx_tty_port_ops;
|
|
|
|
tty_port_init(pport);
|
|
|
|
ifx_dev->minor = IFX_SPI_TTY_ID;
|
|
|
|
ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
|
|
|
|
&ifx_dev->spi_dev->dev);
|
|
|
|
if (IS_ERR(ifx_dev->tty_dev)) {
|
|
|
|
dev_dbg(&ifx_dev->spi_dev->dev,
|
|
|
|
"%s: registering tty device failed", __func__);
|
|
|
|
ret = PTR_ERR(ifx_dev->tty_dev);
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_ret:
|
|
|
|
ifx_spi_free_port(ifx_dev);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_handle_srdy - handle SRDY
|
|
|
|
* @ifx_dev: device asserting SRDY
|
|
|
|
*
|
|
|
|
* Check our device state and see what we need to kick off when SRDY
|
|
|
|
* is asserted. This usually means killing the timer and firing off the
|
|
|
|
* I/O processing.
|
|
|
|
*/
|
|
|
|
static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
|
|
|
|
del_timer_sync(&ifx_dev->spi_timer);
|
|
|
|
clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
|
|
|
|
|
|
|
|
if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
|
|
|
|
tasklet_schedule(&ifx_dev->io_work_tasklet);
|
|
|
|
else
|
|
|
|
set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_srdy_interrupt - SRDY asserted
|
|
|
|
* @irq: our IRQ number
|
|
|
|
* @dev: our ifx device
|
|
|
|
*
|
|
|
|
* The modem asserted SRDY. Handle the srdy event
|
|
|
|
*/
|
|
|
|
static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = dev;
|
|
|
|
ifx_dev->gpio.unack_srdy_int_nb++;
|
|
|
|
ifx_spi_handle_srdy(ifx_dev);
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_reset_interrupt - Modem has changed reset state
|
|
|
|
* @irq: interrupt number
|
|
|
|
* @dev: our device pointer
|
|
|
|
*
|
|
|
|
* The modem has either entered or left reset state. Check the GPIO
|
|
|
|
* line to see which.
|
|
|
|
*
|
|
|
|
* FIXME: review locking on MR_INPROGRESS versus
|
|
|
|
* parallel unsolicited reset/solicited reset
|
|
|
|
*/
|
|
|
|
static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = dev;
|
|
|
|
int val = gpio_get_value(ifx_dev->gpio.reset_out);
|
|
|
|
int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
|
|
|
|
|
|
|
|
if (val == 0) {
|
|
|
|
/* entered reset */
|
|
|
|
set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
|
|
|
|
if (!solreset) {
|
|
|
|
/* unsolicited reset */
|
|
|
|
ifx_spi_ttyhangup(ifx_dev);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* exited reset */
|
|
|
|
clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
|
|
|
|
if (solreset) {
|
|
|
|
set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
|
|
|
|
wake_up(&ifx_dev->mdm_reset_wait);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_free_device - free device
|
|
|
|
* @ifx_dev: device to free
|
|
|
|
*
|
|
|
|
* Free the IFX device
|
|
|
|
*/
|
|
|
|
static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
ifx_spi_free_port(ifx_dev);
|
|
|
|
dma_free_coherent(&ifx_dev->spi_dev->dev,
|
|
|
|
IFX_SPI_TRANSFER_SIZE,
|
|
|
|
ifx_dev->tx_buffer,
|
|
|
|
ifx_dev->tx_bus);
|
|
|
|
dma_free_coherent(&ifx_dev->spi_dev->dev,
|
|
|
|
IFX_SPI_TRANSFER_SIZE,
|
|
|
|
ifx_dev->rx_buffer,
|
|
|
|
ifx_dev->rx_bus);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_reset - reset modem
|
|
|
|
* @ifx_dev: modem to reset
|
|
|
|
*
|
|
|
|
* Perform a reset on the modem
|
|
|
|
*/
|
|
|
|
static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
/*
|
|
|
|
* set up modem power, reset
|
|
|
|
*
|
|
|
|
* delays are required on some platforms for the modem
|
|
|
|
* to reset properly
|
|
|
|
*/
|
|
|
|
set_bit(MR_START, &ifx_dev->mdm_reset_state);
|
|
|
|
gpio_set_value(ifx_dev->gpio.po, 0);
|
|
|
|
gpio_set_value(ifx_dev->gpio.reset, 0);
|
|
|
|
msleep(25);
|
|
|
|
gpio_set_value(ifx_dev->gpio.reset, 1);
|
|
|
|
msleep(1);
|
|
|
|
gpio_set_value(ifx_dev->gpio.po, 1);
|
|
|
|
msleep(1);
|
|
|
|
gpio_set_value(ifx_dev->gpio.po, 0);
|
|
|
|
ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
|
|
|
|
test_bit(MR_COMPLETE,
|
|
|
|
&ifx_dev->mdm_reset_state),
|
|
|
|
IFX_RESET_TIMEOUT);
|
|
|
|
if (!ret)
|
|
|
|
dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
|
|
|
|
ifx_dev->mdm_reset_state);
|
|
|
|
|
|
|
|
ifx_dev->mdm_reset_state = 0;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_spi_probe - probe callback
|
|
|
|
* @spi: our possible matching SPI device
|
|
|
|
*
|
|
|
|
* Probe for a 6x60 modem on SPI bus. Perform any needed device and
|
|
|
|
* GPIO setup.
|
|
|
|
*
|
|
|
|
* FIXME:
|
|
|
|
* - Support for multiple devices
|
|
|
|
* - Split out MID specific GPIO handling eventually
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int ifx_spi_spi_probe(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
int srdy;
|
|
|
|
struct ifx_modem_platform_data *pl_data = NULL;
|
|
|
|
struct ifx_spi_device *ifx_dev;
|
|
|
|
|
|
|
|
if (saved_ifx_dev) {
|
|
|
|
dev_dbg(&spi->dev, "ignoring subsequent detection");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* initialize structure to hold our device variables */
|
|
|
|
ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
|
|
|
|
if (!ifx_dev) {
|
|
|
|
dev_err(&spi->dev, "spi device allocation failed");
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
saved_ifx_dev = ifx_dev;
|
|
|
|
ifx_dev->spi_dev = spi;
|
|
|
|
clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
|
|
|
|
spin_lock_init(&ifx_dev->write_lock);
|
|
|
|
spin_lock_init(&ifx_dev->power_lock);
|
|
|
|
ifx_dev->power_status = 0;
|
|
|
|
init_timer(&ifx_dev->spi_timer);
|
|
|
|
ifx_dev->spi_timer.function = ifx_spi_timeout;
|
|
|
|
ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
|
|
|
|
ifx_dev->is_6160 = pl_data->is_6160;
|
|
|
|
|
|
|
|
/* ensure SPI protocol flags are initialized to enable transfer */
|
|
|
|
ifx_dev->spi_more = 0;
|
|
|
|
ifx_dev->spi_slave_cts = 0;
|
|
|
|
|
|
|
|
/*initialize transfer and dma buffers */
|
|
|
|
ifx_dev->tx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev,
|
|
|
|
IFX_SPI_TRANSFER_SIZE,
|
|
|
|
&ifx_dev->tx_bus,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!ifx_dev->tx_buffer) {
|
|
|
|
dev_err(&spi->dev, "DMA-TX buffer allocation failed");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
ifx_dev->rx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev,
|
|
|
|
IFX_SPI_TRANSFER_SIZE,
|
|
|
|
&ifx_dev->rx_bus,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (!ifx_dev->rx_buffer) {
|
|
|
|
dev_err(&spi->dev, "DMA-RX buffer allocation failed");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* initialize waitq for modem reset */
|
|
|
|
init_waitqueue_head(&ifx_dev->mdm_reset_wait);
|
|
|
|
|
|
|
|
spi_set_drvdata(spi, ifx_dev);
|
|
|
|
tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
|
|
|
|
(unsigned long)ifx_dev);
|
|
|
|
|
|
|
|
set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
|
|
|
|
|
|
|
|
/* create our tty port */
|
|
|
|
ret = ifx_spi_create_port(ifx_dev);
|
|
|
|
if (ret != 0) {
|
|
|
|
dev_err(&spi->dev, "create default tty port failed");
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
|
|
|
|
if (pl_data) {
|
|
|
|
ifx_dev->gpio.reset = pl_data->rst_pmu;
|
|
|
|
ifx_dev->gpio.po = pl_data->pwr_on;
|
|
|
|
ifx_dev->gpio.mrdy = pl_data->mrdy;
|
|
|
|
ifx_dev->gpio.srdy = pl_data->srdy;
|
|
|
|
ifx_dev->gpio.reset_out = pl_data->rst_out;
|
|
|
|
} else {
|
|
|
|
dev_err(&spi->dev, "missing platform data!");
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
|
|
|
|
ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
|
|
|
|
ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
|
|
|
|
|
|
|
|
/* Configure gpios */
|
|
|
|
ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
|
|
|
|
ifx_dev->gpio.reset);
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
|
|
|
|
ret += gpio_export(ifx_dev->gpio.reset, 1);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
|
|
|
|
ifx_dev->gpio.reset);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret2;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
|
|
|
|
ret += gpio_direction_output(ifx_dev->gpio.po, 0);
|
|
|
|
ret += gpio_export(ifx_dev->gpio.po, 1);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
|
|
|
|
ifx_dev->gpio.po);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret3;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
|
|
|
|
ifx_dev->gpio.mrdy);
|
|
|
|
goto error_ret3;
|
|
|
|
}
|
|
|
|
ret += gpio_export(ifx_dev->gpio.mrdy, 1);
|
|
|
|
ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
|
|
|
|
ifx_dev->gpio.mrdy);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret4;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
|
|
|
|
ifx_dev->gpio.srdy);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret4;
|
|
|
|
}
|
|
|
|
ret += gpio_export(ifx_dev->gpio.srdy, 1);
|
|
|
|
ret += gpio_direction_input(ifx_dev->gpio.srdy);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
|
|
|
|
ifx_dev->gpio.srdy);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret5;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
|
|
|
|
ifx_dev->gpio.reset_out);
|
|
|
|
goto error_ret5;
|
|
|
|
}
|
|
|
|
ret += gpio_export(ifx_dev->gpio.reset_out, 1);
|
|
|
|
ret += gpio_direction_input(ifx_dev->gpio.reset_out);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
|
|
|
|
ifx_dev->gpio.reset_out);
|
|
|
|
ret = -EBUSY;
|
|
|
|
goto error_ret6;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
|
|
|
|
ifx_spi_reset_interrupt,
|
|
|
|
IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
|
|
|
|
(void *)ifx_dev);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to get irq %x\n",
|
|
|
|
gpio_to_irq(ifx_dev->gpio.reset_out));
|
|
|
|
goto error_ret6;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = ifx_spi_reset(ifx_dev);
|
|
|
|
|
|
|
|
ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
|
|
|
|
ifx_spi_srdy_interrupt,
|
|
|
|
IRQF_TRIGGER_RISING, DRVNAME,
|
|
|
|
(void *)ifx_dev);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&spi->dev, "Unable to get irq %x",
|
|
|
|
gpio_to_irq(ifx_dev->gpio.srdy));
|
2010-11-19 11:42:03 -07:00
|
|
|
goto error_ret7;
|
2010-10-26 06:13:52 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
/* set pm runtime power state and register with power system */
|
|
|
|
pm_runtime_set_active(&spi->dev);
|
|
|
|
pm_runtime_enable(&spi->dev);
|
|
|
|
|
|
|
|
/* handle case that modem is already signaling SRDY */
|
|
|
|
/* no outgoing tty open at this point, this just satisfies the
|
|
|
|
* modem's read and should reset communication properly
|
|
|
|
*/
|
|
|
|
srdy = gpio_get_value(ifx_dev->gpio.srdy);
|
|
|
|
|
|
|
|
if (srdy) {
|
|
|
|
mrdy_assert(ifx_dev);
|
|
|
|
ifx_spi_handle_srdy(ifx_dev);
|
|
|
|
} else
|
|
|
|
mrdy_set_low(ifx_dev);
|
|
|
|
return 0;
|
|
|
|
|
2010-11-19 11:42:03 -07:00
|
|
|
error_ret7:
|
|
|
|
free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
|
2010-10-26 06:13:52 -07:00
|
|
|
error_ret6:
|
|
|
|
gpio_free(ifx_dev->gpio.srdy);
|
|
|
|
error_ret5:
|
|
|
|
gpio_free(ifx_dev->gpio.mrdy);
|
|
|
|
error_ret4:
|
|
|
|
gpio_free(ifx_dev->gpio.reset);
|
|
|
|
error_ret3:
|
|
|
|
gpio_free(ifx_dev->gpio.po);
|
|
|
|
error_ret2:
|
|
|
|
gpio_free(ifx_dev->gpio.reset_out);
|
|
|
|
error_ret:
|
|
|
|
ifx_spi_free_device(ifx_dev);
|
|
|
|
saved_ifx_dev = NULL;
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_spi_remove - SPI device was removed
|
|
|
|
* @spi: SPI device
|
|
|
|
*
|
|
|
|
* FIXME: We should be shutting the device down here not in
|
|
|
|
* the module unload path.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int ifx_spi_spi_remove(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
|
|
|
|
/* stop activity */
|
|
|
|
tasklet_kill(&ifx_dev->io_work_tasklet);
|
|
|
|
/* free irq */
|
|
|
|
free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
|
|
|
|
free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
|
|
|
|
|
|
|
|
gpio_free(ifx_dev->gpio.srdy);
|
|
|
|
gpio_free(ifx_dev->gpio.mrdy);
|
|
|
|
gpio_free(ifx_dev->gpio.reset);
|
|
|
|
gpio_free(ifx_dev->gpio.po);
|
|
|
|
gpio_free(ifx_dev->gpio.reset_out);
|
|
|
|
|
|
|
|
/* free allocations */
|
|
|
|
ifx_spi_free_device(ifx_dev);
|
|
|
|
|
|
|
|
saved_ifx_dev = NULL;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_spi_shutdown - called on SPI shutdown
|
|
|
|
* @spi: SPI device
|
|
|
|
*
|
|
|
|
* No action needs to be taken here
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void ifx_spi_spi_shutdown(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* various suspends and resumes have nothing to do
|
|
|
|
* no hardware to save state for
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_spi_suspend - suspend SPI on system suspend
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Suspend the SPI side. No action needed on Intel MID platforms, may
|
|
|
|
* need extending for other systems.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_spi_resume - resume SPI side on system resume
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Suspend the SPI side. No action needed on Intel MID platforms, may
|
|
|
|
* need extending for other systems.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_spi_resume(struct spi_device *spi)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_pm_suspend - suspend modem on system suspend
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Suspend the modem. No action needed on Intel MID platforms, may
|
|
|
|
* need extending for other systems.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_pm_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_pm_resume - resume modem on system resume
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Allow the modem to resume. No action needed.
|
|
|
|
*
|
|
|
|
* FIXME: do we need to reset anything here ?
|
|
|
|
*/
|
|
|
|
static int ifx_spi_pm_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_pm_runtime_resume - suspend modem
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Allow the modem to resume. No action needed.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_pm_runtime_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_pm_runtime_suspend - suspend modem
|
|
|
|
* @dev: device being suspended
|
|
|
|
*
|
|
|
|
* Allow the modem to suspend and thus suspend to continue up the
|
|
|
|
* device tree.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_pm_runtime_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_pm_runtime_idle - check if modem idle
|
|
|
|
* @dev: our device
|
|
|
|
*
|
|
|
|
* Check conditions and queue runtime suspend if idle.
|
|
|
|
*/
|
|
|
|
static int ifx_spi_pm_runtime_idle(struct device *dev)
|
|
|
|
{
|
|
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
|
|
struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
|
|
|
|
|
|
|
|
if (!ifx_dev->power_status)
|
|
|
|
pm_runtime_suspend(dev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct dev_pm_ops ifx_spi_pm = {
|
|
|
|
.resume = ifx_spi_pm_resume,
|
|
|
|
.suspend = ifx_spi_pm_suspend,
|
|
|
|
.runtime_resume = ifx_spi_pm_runtime_resume,
|
|
|
|
.runtime_suspend = ifx_spi_pm_runtime_suspend,
|
|
|
|
.runtime_idle = ifx_spi_pm_runtime_idle
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct spi_device_id ifx_id_table[] = {
|
|
|
|
{"ifx6160", 0},
|
|
|
|
{"ifx6260", 0},
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(spi, ifx_id_table);
|
|
|
|
|
|
|
|
/* spi operations */
|
|
|
|
static const struct spi_driver ifx_spi_driver_6160 = {
|
|
|
|
.driver = {
|
|
|
|
.name = "ifx6160",
|
|
|
|
.bus = &spi_bus_type,
|
|
|
|
.pm = &ifx_spi_pm,
|
|
|
|
.owner = THIS_MODULE},
|
|
|
|
.probe = ifx_spi_spi_probe,
|
|
|
|
.shutdown = ifx_spi_spi_shutdown,
|
|
|
|
.remove = __devexit_p(ifx_spi_spi_remove),
|
|
|
|
.suspend = ifx_spi_spi_suspend,
|
|
|
|
.resume = ifx_spi_spi_resume,
|
|
|
|
.id_table = ifx_id_table
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_exit - module exit
|
|
|
|
*
|
|
|
|
* Unload the module.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void __exit ifx_spi_exit(void)
|
|
|
|
{
|
|
|
|
/* unregister */
|
|
|
|
tty_unregister_driver(tty_drv);
|
|
|
|
spi_unregister_driver((void *)&ifx_spi_driver_6160);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ifx_spi_init - module entry point
|
|
|
|
*
|
|
|
|
* Initialise the SPI and tty interfaces for the IFX SPI driver
|
|
|
|
* We need to initialize upper-edge spi driver after the tty
|
|
|
|
* driver because otherwise the spi probe will race
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int __init ifx_spi_init(void)
|
|
|
|
{
|
|
|
|
int result;
|
|
|
|
|
|
|
|
tty_drv = alloc_tty_driver(1);
|
|
|
|
if (!tty_drv) {
|
|
|
|
pr_err("%s: alloc_tty_driver failed", DRVNAME);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
tty_drv->magic = TTY_DRIVER_MAGIC;
|
|
|
|
tty_drv->owner = THIS_MODULE;
|
|
|
|
tty_drv->driver_name = DRVNAME;
|
|
|
|
tty_drv->name = TTYNAME;
|
|
|
|
tty_drv->minor_start = IFX_SPI_TTY_ID;
|
|
|
|
tty_drv->num = 1;
|
|
|
|
tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
|
|
|
|
tty_drv->subtype = SERIAL_TYPE_NORMAL;
|
|
|
|
tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
|
|
tty_drv->init_termios = tty_std_termios;
|
|
|
|
|
|
|
|
tty_set_operations(tty_drv, &ifx_spi_serial_ops);
|
|
|
|
|
|
|
|
result = tty_register_driver(tty_drv);
|
|
|
|
if (result) {
|
|
|
|
pr_err("%s: tty_register_driver failed(%d)",
|
|
|
|
DRVNAME, result);
|
2010-11-19 11:41:45 -07:00
|
|
|
put_tty_driver(tty_drv);
|
2010-10-26 06:13:52 -07:00
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
result = spi_register_driver((void *)&ifx_spi_driver_6160);
|
|
|
|
if (result) {
|
|
|
|
pr_err("%s: spi_register_driver failed(%d)",
|
|
|
|
DRVNAME, result);
|
|
|
|
tty_unregister_driver(tty_drv);
|
|
|
|
}
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(ifx_spi_init);
|
|
|
|
module_exit(ifx_spi_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Intel");
|
|
|
|
MODULE_DESCRIPTION("IFX6x60 spi driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_INFO(Version, "0.1-IFX6x60");
|