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This driver for the Intel MID never seems to have been properly integrated upstream: the platform data in <linux/spi/ifx_modem.h> is not used anywhere in the kernel and haven't been since it was merged into the kernel in 2010. There might be out-of-tree users, so I don't want to delete the driver, but I will refactor it to use GPIO descriptors, which means that out-of-tree users will need to adapt. There are several examples in the kernel of how to provide the resources necessary for using GPIO descriptors to pass in the GPIO lines, for the MID platform in particular, it will suffice to inspect the code in files like: arch/x86/platform/intel-mid/device_libs/platform_bt.c This refactoring transfers all GPIOs in the driver, including a hard-coded "PMU reset" in the driver to use GPIO descriptors instead. The following named GPIO descriptors need to be supplied: - reset - power - mrdy - srdy - rst_out - pmu_reset Cc: Russ Gorby <russ.gorby@intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200311083131.693908-2-linus.walleij@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/****************************************************************************
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*
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* Driver for the IFX spi modem.
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*
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* Copyright (C) 2009, 2010 Intel Corp
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* Jim Stanley <jim.stanley@intel.com>
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*
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*****************************************************************************/
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#ifndef _IFX6X60_H
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#define _IFX6X60_H
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struct gpio_desc;
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#define DRVNAME "ifx6x60"
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#define TTYNAME "ttyIFX"
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#define IFX_SPI_MAX_MINORS 1
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#define IFX_SPI_TRANSFER_SIZE 2048
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#define IFX_SPI_FIFO_SIZE 4096
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#define IFX_SPI_HEADER_OVERHEAD 4
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#define IFX_RESET_TIMEOUT msecs_to_jiffies(50)
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/* device flags bitfield definitions */
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#define IFX_SPI_STATE_PRESENT 0
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#define IFX_SPI_STATE_IO_IN_PROGRESS 1
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#define IFX_SPI_STATE_IO_READY 2
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#define IFX_SPI_STATE_TIMER_PENDING 3
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#define IFX_SPI_STATE_IO_AVAILABLE 4
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/* flow control bitfields */
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#define IFX_SPI_DCD 0
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#define IFX_SPI_CTS 1
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#define IFX_SPI_DSR 2
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#define IFX_SPI_RI 3
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#define IFX_SPI_DTR 4
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#define IFX_SPI_RTS 5
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#define IFX_SPI_TX_FC 6
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#define IFX_SPI_RX_FC 7
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#define IFX_SPI_UPDATE 8
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#define IFX_SPI_PAYLOAD_SIZE (IFX_SPI_TRANSFER_SIZE - \
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IFX_SPI_HEADER_OVERHEAD)
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#define IFX_SPI_IRQ_TYPE DETECT_EDGE_RISING
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#define IFX_SPI_GPIO_TARGET 0
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#define IFX_SPI_GPIO0 0x105
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#define IFX_SPI_STATUS_TIMEOUT (2000*HZ)
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/* values for bits in power status byte */
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#define IFX_SPI_POWER_DATA_PENDING 1
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#define IFX_SPI_POWER_SRDY 2
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struct ifx_spi_device {
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/* Our SPI device */
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struct spi_device *spi_dev;
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/* Port specific data */
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struct kfifo tx_fifo;
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spinlock_t fifo_lock;
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unsigned long signal_state;
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/* TTY Layer logic */
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struct tty_port tty_port;
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struct device *tty_dev;
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int minor;
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/* Low level I/O work */
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struct tasklet_struct io_work_tasklet;
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unsigned long flags;
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dma_addr_t rx_dma;
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dma_addr_t tx_dma;
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int modem; /* Modem type */
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int use_dma; /* provide dma-able addrs in SPI msg */
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long max_hz; /* max SPI frequency */
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spinlock_t write_lock;
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int write_pending;
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spinlock_t power_lock;
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unsigned char power_status;
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unsigned char *rx_buffer;
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unsigned char *tx_buffer;
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dma_addr_t rx_bus;
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dma_addr_t tx_bus;
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unsigned char spi_more;
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unsigned char spi_slave_cts;
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struct timer_list spi_timer;
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struct spi_message spi_msg;
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struct spi_transfer spi_xfer;
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struct {
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/* gpio lines */
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struct gpio_desc *srdy; /* slave-ready gpio */
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struct gpio_desc *mrdy; /* master-ready gpio */
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struct gpio_desc *reset; /* modem-reset gpio */
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struct gpio_desc *po; /* modem-on gpio */
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struct gpio_desc *reset_out; /* modem-in-reset gpio */
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struct gpio_desc *pmu_reset; /* PMU reset gpio */
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/* state/stats */
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int unack_srdy_int_nb;
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} gpio;
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/* modem reset */
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unsigned long mdm_reset_state;
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#define MR_START 0
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#define MR_INPROGRESS 1
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#define MR_COMPLETE 2
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wait_queue_head_t mdm_reset_wait;
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void (*swap_buf)(unsigned char *buf, int len, void *end);
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};
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#endif /* _IFX6X60_H */
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