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Date: Fri, 8 Oct 2010 12:40:57 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Masayuki Ohtak <masa-korg@....okisemi.com>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Richard Röjfors
<richard.rojfors@...ean-labs.com>,
Tony Lindgren <tony@...mide.com>,
H Hartley Sweeten <hsweeten@...ionengravers.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
spi-devel-general@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, meego-dev@...go.com,
qi.wang@...el.com, yong.y.wang@...el.com,
andrew.chih.howe.khor@...el.com, arjan@...ux.intel.com,
Tomoya MORINAGA <morinaga526@....okisemi.com>, gregkh@...e.de
Subject: Re: [MeeGo-Dev][PATCH v2] Topcliff: Update PCH_SPI driver to 2.6.35
On Thu, Sep 16, 2010 at 04:32:56PM +0900, Masayuki Ohtak wrote:
> Hi Grant,
>
> We have modified whole of your indications.
>
> Thanks, Ohtake (OKISemi)
Hi Ohtake.
There are still a bunch of minor issues with this driver, but I've
picked it up anyway and additional cleanups can be done in-tree now
that the major problems have been resolved. It is in my spi-next tree
which will be pushed out to git://git.secretlab.ca/git/linux-2.6 this
afternoon. However, I've changed the name of the source file to
spi_topcliff_pch.c, and I've applied a stylistic cleanup patch on top
of it (which I'll post to the list shortly). I changed the name
because 'pch' alone is too generic in my opinion.
Cheers,
g.
>
> ---
> SPI driver of Topcliff PCH
>
> Topcliff PCH is the platform controller hub that is going to be used in
> Intel's upcoming general embedded platform. All IO peripherals in
> Topcliff PCH are actually devices sitting on AMBA bus.
> Topcliff PCH has SPI I/F. Using this I/F, it is able to access system
> devices connected to SPI.
>
> Signed-off-by: Masayuki Ohtake <masa-korg@....okisemi.com>
> ---
> drivers/spi/Kconfig | 8 +
> drivers/spi/Makefile | 1 +
> drivers/spi/spi_pch.c | 1529 +++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1538 insertions(+), 0 deletions(-)
> create mode 100644 drivers/spi/spi_pch.c
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 91c2f4f..86dbf26 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -53,6 +53,14 @@ if SPI_MASTER
>
> comment "SPI Master Controller Drivers"
>
> +config SPI_TOPCLIFF_PCH
> + tristate "PCH SPI Controller"
> + depends on PCI
> + help
> + This driver is for PCH(Platform controller Hub) SPI of Topcliff which
> + is an IOH(Input/Output Hub) for x86 embedded processor.
> + This driver can access PCH SPI bus device.
> +
> config SPI_ATMEL
> tristate "Atmel SPI Controller"
> depends on (ARCH_AT91 || AVR32)
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index e9cbd18..6ffdfb9 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -47,6 +47,7 @@ obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
> obj-$(CONFIG_SPI_SH_MSIOF) += spi_sh_msiof.o
> obj-$(CONFIG_SPI_STMP3XXX) += spi_stmp.o
> obj-$(CONFIG_SPI_NUC900) += spi_nuc900.o
> +obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi_pch.o
>
> # special build for s3c24xx spi driver with fiq support
> spi_s3c24xx_hw-y := spi_s3c24xx.o
> diff --git a/drivers/spi/spi_pch.c b/drivers/spi/spi_pch.c
> new file mode 100644
> index 0000000..6da040a
> --- /dev/null
> +++ b/drivers/spi/spi_pch.c
> @@ -0,0 +1,1529 @@
> +/*
> + * SPI bus driver for the Topcliff PCH used by Intel SoCs
> + */
> +
> +/*
> + * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
> + */
> +
> +#include <linux/pci.h>
> +#include <linux/wait.h>
> +#include <linux/spi/spi.h>
> +#include <linux/interrupt.h>
> +#include <linux/sched.h>
> +#include <linux/spi/spidev.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +
> +/* Register offsets */
> +#define PCH_SPCR 0x00 /* SPI control register */
> +#define PCH_SPBRR 0x04 /* SPI baud rate register */
> +#define PCH_SPSR 0x08 /* SPI status register */
> +#define PCH_SPDWR 0x0C /* SPI write data register */
> +#define PCH_SPDRR 0x10 /* SPI read data register */
> +#define PCH_SSNXCR 0x18 /* SSN Expand Control Register */
> +#define PCH_SRST 0x1C /* SPI reset register */
> +
> +#define PCH_SPSR_TFD 0x000007C0
> +#define PCH_SPSR_RFD 0x0000F800
> +
> +#define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11)
> +#define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6)
> +
> +#define PCH_RX_THOLD 7
> +#define PCH_RX_THOLD_MAX 15
> +#define PCH_RX 1
> +#define PCH_TX 2
> +
> +/* various interrupts */
> +#define PCH_TFI 0x1
> +#define PCH_RFI 0x2
> +#define PCH_FI 0x4
> +#define PCH_ORI 0x8
> +#define PCH_MDFI 0x10
> +
> +#define PCH_ALL (PCH_TFI|PCH_RFI|PCH_FI|PCH_ORI|PCH_MDFI)
> +#define PCH_MAX_BAUDRATE 5000000
> +#define PCH_MAX_FIFO_DEPTH 16
> +
> +#define STATUS_RUNNING 1
> +#define STATUS_EXITING 2
> +#define PCH_SLEEP_TIME 10
> +
> +#define PCH_ADDRESS_SIZE 0x20
> +
> +#define SSN_LOW 0x02U
> +#define SSN_NO_CONTROL 0x00U
> +#define PCH_MAX_CS 0xFF
> +#define PCI_DEVICE_ID_GE_SPI 0x8816
> +
> +#define SPCR_SPE_BIT (1 << 0)
> +#define SPCR_MSTR_BIT (1 << 1)
> +#define SPCR_LSBF_BIT (1 << 4)
> +#define SPCR_CPHA_BIT (1 << 5)
> +#define SPCR_CPOL_BIT (1 << 6)
> +#define SPCR_TFIE_BIT (1 << 8)
> +#define SPCR_RFIE_BIT (1 << 9)
> +#define SPCR_FIE_BIT (1 << 10)
> +#define SPCR_ORIE_BIT (1 << 11)
> +#define SPCR_MDFIE_BIT (1 << 12)
> +#define SPCR_FICLR_BIT (1 << 24)
> +#define SPSR_TFI_BIT (1 << 0)
> +#define SPSR_RFI_BIT (1 << 1)
> +#define SPSR_FI_BIT (1 << 2)
> +#define SPBRR_SIZE_BIT (1 << 10)
> +
> +#define SPCR_RFIC_FIELD 20
> +#define SPCR_TFIC_FIELD 16
> +
> +#define SPSR_INT_BITS 0x1F
> +#define MASK_SPBRR_SPBR_BITS (~((1 << 10) - 1))
> +#define MASK_RFIC_SPCR_BITS (~(0xf << 20))
> +#define MASK_TFIC_SPCR_BITS (~(0xf000f << 12))
> +
> +#define PCH_CLOCK_HZ 50000000
> +#define PCH_MAX_SPBR 1023
> +
> +
> +/**
> + * struct pch_spi_data - Holds the SPI channel specific details
> + * @io_remap_addr: The remapped PCI base address
> + * @master: Pointer to the SPI master structure
> + * @work: Reference to work queue handler
> + * @wk: Workqueue for carrying out execution of the
> + * requests
> + * @wait: Wait queue for waking up upon receiving an
> + * interrupt.
> + * @transfer_complete: Status of SPI Transfer
> + * @bcurrent_msg_processing: Status flag for message processing
> + * @lock: Lock for protecting this structure
> + * @queue: SPI Message queue
> + * @status: Status of the SPI driver
> + * @bpw_len: Length of data to be transferred in bits per
> + * word
> + * @transfer_active: Flag showing active transfer
> + * @tx_index: Transmit data count; for bookkeeping during
> + * transfer
> + * @rx_index: Receive data count; for bookkeeping during
> + * transfer
> + * @tx_buff: Buffer for data to be transmitted
> + * @rx_index: Buffer for Received data
> + * @n_curnt_chip: The chip number that this SPI driver currently
> + * operates on
> + * @current_chip: Reference to the current chip that this SPI
> + * driver currently operates on
> + * @current_msg: The current message that this SPI driver is
> + * handling
> + * @cur_trans: The current transfer that this SPI driver is
> + * handling
> + * @board_dat: Reference to the SPI device data structure
> + */
> +struct pch_spi_data {
> + void __iomem *io_remap_addr;
> + struct spi_master *master;
> + struct work_struct work;
> + struct workqueue_struct *wk;
> + wait_queue_head_t wait;
> + u8 transfer_complete;
> + u8 bcurrent_msg_processing;
> + spinlock_t lock;
> + struct list_head queue;
> + u8 status;
> + u32 bpw_len;
> + u8 transfer_active;
> + u32 tx_index;
> + u32 rx_index;
> + u16 *pkt_tx_buff;
> + u16 *pkt_rx_buff;
> + u8 n_curnt_chip;
> + struct spi_device *current_chip;
> + struct spi_message *current_msg;
> + struct spi_transfer *cur_trans;
> + struct pch_spi_board_data *board_dat;
> +};
> +
> +/**
> + * struct pch_spi_board_data - Holds the SPI device specific details
> + * @pdev: Pointer to the PCI device
> + * @irq_reg_sts: Status of IRQ registration
> + * @pci_req_sts: Status of pci_request_regions
> + * @suspend_sts: Status of suspend
> + * @data: Pointer to SPI channel data structure
> + */
> +struct pch_spi_board_data {
> + struct pci_dev *pdev;
> + u8 irq_reg_sts;
> + u8 pci_req_sts;
> + u8 suspend_sts;
> + struct pch_spi_data *data;
> +};
> +
> +static struct pci_device_id pch_spi_pcidev_id[] = {
> + {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_GE_SPI)},
> + {0,}
> +};
> +
> +static inline void pch_set_bitmsk(u32 *var, u32 bitmask)
> +{
> + *var |= bitmask;
> +}
> +
> +static inline void pch_clr_bitmsk(u32 *var, u32 bitmask)
> +{
> + *var &= (~(bitmask));
> +}
> +
> +/**
> + * pch_spi_writereg() - Performs register writes
> + * @master: Pointer to struct spi_master.
> + * @idx: Register offset.
> + * @val: Value to be written to register.
> + */
> +static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val)
> +{
> +
> + struct pch_spi_data *data = spi_master_get_devdata(master);
> +
> + iowrite32(val, (data->io_remap_addr + idx));
> +}
> +
> +/**
> + * pch_spi_readreg() - Performs register reads
> + * @master: Pointer to struct spi_master.
> + * @idx: Register offset.
> + */
> +static inline u32 pch_spi_readreg(struct spi_master *master, int idx)
> +{
> + struct pch_spi_data *data = spi_master_get_devdata(master);
> +
> + return ioread32(data->io_remap_addr + idx);
> +}
> +
> +/* ope==true:Set bit, ope==false:Clear bit */
> +static inline void pch_spi_setclr_bit(u32 *val, u32 pos, bool ope)
> +{
> + if (ope)
> + *val |= pos;
> + else
> + *val &= (~(pos));
> +}
> +
> +static inline void pch_spi_setclr_reg(struct spi_master *master, int idx,
> + u32 set, u32 clr)
> +{
> + u32 tmp = pch_spi_readreg(master, idx);
> + tmp = (tmp & ~clr) | set;
> + pch_spi_writereg(master, idx, tmp);
> +}
> +
> +
> +static void pch_spi_set_master_mode(struct spi_master *master)
> +{
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0);
> +}
> +
> +/**
> + * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs
> + * @master: Pointer to struct spi_master.
> + */
> +static void pch_spi_clear_fifo(struct spi_master *master)
> +{
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0);
> + pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT);
> +}
> +
> +/**
> + * ch_spi_disable_interrupts() - Disables specified interrupts
> + * @master: Pointer to struct spi_master.
> + * @interrupt: Interrups to be enabled.
> + */
> +static void pch_spi_disable_interrupts(struct spi_master *master, u8 interrupt)
> +{
> + u32 clr_flags = 0;
> +
> + if (interrupt & PCH_RFI)
> + clr_flags |= SPCR_RFIE_BIT;
> +
> + if (interrupt & PCH_TFI)
> + clr_flags |= SPCR_TFIE_BIT;
> +
> + if (interrupt & PCH_FI)
> + clr_flags |= SPCR_FIE_BIT;
> +
> + if (interrupt & PCH_ORI)
> + clr_flags |= SPCR_ORIE_BIT;
> +
> + if (interrupt & PCH_MDFI)
> + clr_flags |= SPCR_MDFIE_BIT;
> +
> + pch_spi_setclr_reg(master, PCH_SPCR, 0, clr_flags);
> +
> + dev_dbg(&master->dev, "%s clearing bits =%x\n", __func__, clr_flags);
> +}
> +
> +static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val,
> + void __iomem *io_remap_addr)
> +{
> + u32 n_read, tx_index, rx_index, bpw_len;
> + u16 *pkt_rx_buffer, *pkt_tx_buff;
> + int read_cnt;
> + u32 reg_spcr_val;
> + void __iomem *spsr;
> + void __iomem *spdrr;
> + void __iomem *spdwr;
> +
> + spsr = io_remap_addr + PCH_SPSR;
> + iowrite32(reg_spsr_val, spsr);
> +
> + if (data->transfer_active) {
> + rx_index = data->rx_index;
> + tx_index = data->tx_index;
> + bpw_len = data->bpw_len;
> + pkt_rx_buffer = data->pkt_rx_buff;
> + pkt_tx_buff = data->pkt_tx_buff;
> +
> + spdrr = io_remap_addr + PCH_SPDRR;
> + spdwr = io_remap_addr + PCH_SPDWR;
> +
> + n_read = PCH_READABLE(reg_spsr_val);
> +
> + for (read_cnt = 0; (read_cnt < n_read); read_cnt++) {
> + pkt_rx_buffer[rx_index++] = ioread32(spdrr);
> + if (tx_index < bpw_len)
> + iowrite32(pkt_tx_buff[tx_index++], spdwr);
> + }
> +
> + /* disable RFI if not needed */
> + if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) {
> + reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR);
> +
> + /* disable RFI */
> + pch_clr_bitmsk(®_spcr_val, SPCR_RFIE_BIT);
> +
> + /* reset rx threshold */
> + reg_spcr_val &= MASK_RFIC_SPCR_BITS;
> + reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD);
> + iowrite32(((reg_spcr_val) &= (~(SPCR_RFIE_BIT))),
> + (io_remap_addr + PCH_SPCR));
> + }
> +
> + /* update counts */
> + data->tx_index = tx_index;
> + data->rx_index = rx_index;
> +
> + }
> +
> + /* if transfer complete interrupt */
> + if (reg_spsr_val & SPSR_FI_BIT) {
> + /* disable FI & RFI interrupts */
> + pch_spi_disable_interrupts(data->master, PCH_FI | PCH_RFI);
> +
> + /* transfer is completed;inform pch_spi_process_messages */
> + data->transfer_complete = true;
> + wake_up(&data->wait);
> + }
> +}
> +
> +
> +/**
> + * pch_spi_handler() - Interrupt handler
> + * @irq: The interrupt number.
> + * @dev_id: Pointer to struct pch_spi_board_data.
> + */
> +static irqreturn_t pch_spi_handler(int irq, void *dev_id)
> +{
> + u32 reg_spsr_val;
> + struct pch_spi_data *data;
> + void __iomem *spsr;
> + void __iomem *io_remap_addr;
> + irqreturn_t ret = IRQ_NONE;
> +
> + struct pch_spi_board_data *board_dat = dev_id;
> +
> + if (board_dat->suspend_sts) {
> + dev_dbg(&board_dat->pdev->dev,
> + "%s returning due to suspend\n", __func__);
> + return IRQ_NONE;
> + }
> +
> + data = board_dat->data;
> + io_remap_addr = data->io_remap_addr;
> + spsr = io_remap_addr + PCH_SPSR;
> +
> + reg_spsr_val = ioread32(spsr);
> +
> + /* Check if the interrupt is for SPI device */
> +
> + if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) {
> + pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr);
> + ret = IRQ_HANDLED;
> + }
> +
> + dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n",
> + __func__, ret);
> +
> + return ret;
> +}
> +
> +/**
> + * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR
> + * @master: Pointer to struct spi_master.
> + * @speed_hz: Baud rate.
> + */
> +static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz)
> +{
> + u32 n_spbr;
> +
> + n_spbr = PCH_CLOCK_HZ / (speed_hz * 2);
> +
> + /* if baud rate is less than we can support limit it */
> +
> + if (n_spbr > PCH_MAX_SPBR)
> + n_spbr = PCH_MAX_SPBR;
> +
> + pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, ~MASK_SPBRR_SPBR_BITS);
> +}
> +
> +/**
> + * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR
> + * @master: Pointer to struct spi_master.
> + * @bits_per_word: Bits per word for SPI transfer.
> + */
> +static void pch_spi_set_bits_per_word(struct spi_master *master,
> + u8 bits_per_word)
> +{
> + if (bits_per_word == 8)
> + pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT);
> + else
> + pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0);
> +}
> +
> +/**
> + * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer
> + * @spi: Pointer to struct spi_device.
> + */
> +static void pch_spi_setup_transfer(struct spi_device *spi)
> +{
> + u32 reg_spcr_val;
> +
> + dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n",
> + __func__, pch_spi_readreg(spi->master, PCH_SPBRR),
> + spi->max_speed_hz);
> +
> + pch_spi_set_baud_rate(spi->master, spi->max_speed_hz);
> +
> + /* set bits per word */
> + pch_spi_set_bits_per_word(spi->master, spi->bits_per_word);
> +
> + if (spi->mode & SPI_LSB_FIRST)
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_LSBF_BIT);
> + else
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_LSBF_BIT, 0);
> +
> + if (spi->mode & SPI_CPOL)
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_CPOL_BIT, 0);
> + else
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_CPOL_BIT);
> +
> + if (spi->mode & SPI_CPHA)
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, SPCR_CPHA_BIT, 0);
> + else
> + pch_spi_setclr_reg(spi->master, PCH_SPCR, 0, SPCR_CPHA_BIT);
> +
> + dev_dbg(&spi->dev,
> + "%s SPCR content after setting LSB/MSB and MODE= %x\n",
> + __func__, reg_spcr_val);
> +
> + /* Clear the FIFO by toggling FICLR to 1 and back to 0 */
> + pch_spi_clear_fifo(spi->master);
> +}
> +
> +/**
> + * pch_spi_enable_interrupts() - Enables specified interrupts
> + * @master: Pointer to struct spi_master.
> + * @interrupt: Interrups to be enabled.
> + */
> +static void pch_spi_enable_interrupts(struct spi_master *master, u8 interrupt)
> +{
> + u32 reg_val_spcr;
> +
> + dev_dbg(&master->dev, "%s SPCR content=%x\n", __func__, reg_val_spcr);
> +
> + if (interrupt & PCH_RFI) {
> + /* set RFIE bit in SPCR */
> + dev_dbg(&master->dev, "setting RFI in %s\n", __func__);
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_RFIE_BIT, 0);
> + }
> +
> + if (interrupt & PCH_TFI) {
> + /* set TFIE bit in SPCR */
> + dev_dbg(&master->dev, "setting TFI in %s\n", __func__);
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_TFIE_BIT, 0);
> + }
> +
> + if (interrupt & PCH_FI) {
> + /* set FIE bit in SPCR */
> + dev_dbg(&master->dev, "setting FI in %s\n", __func__);
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FIE_BIT, 0);
> + }
> +
> + if (interrupt & PCH_ORI) {
> + /* set ORIE bit in SPCR */
> + dev_dbg(&master->dev, "setting ORI in %s\n", __func__);
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_ORIE_BIT, 0);
> + }
> +
> + if (interrupt & PCH_MDFI) {
> + /* set MODFIE bit in SPCR */
> + dev_dbg(&master->dev, "setting MDFI in %s\n", __func__);
> + pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MDFIE_BIT, 0);
> + }
> +}
> +
> +/**
> + * pch_spi_set_threshold() - Sets Tx/Rx FIFO thresholds
> + * @spi: Pointer to struct spi_device.
> + * @threshold: Threshold value to be set.
> + * @dir: Rx or Tx threshold to be set.
> + */
> +static void pch_spi_set_threshold(struct spi_device *spi, u32 threshold, u8 dir)
> +{
> +
> + if (dir == PCH_RX) {
> + dev_dbg(&spi->dev, "%s setting Rx threshold\n", __func__);
> + pch_spi_setclr_reg(spi->master, PCH_SPCR,
> + threshold << SPCR_RFIC_FIELD,
> + ~MASK_RFIC_SPCR_BITS);
> +
> + } else if (dir == PCH_TX) {
> + dev_dbg(&spi->dev, "%s setting Tx threshold\n", __func__);
> + pch_spi_setclr_reg(spi->master, PCH_SPCR,
> + (threshold << SPCR_TFIC_FIELD) ,
> + ~MASK_TFIC_SPCR_BITS);
> + }
> +}
> +
> +/**
> + * pch_spi_reset() - Clears SPI registers
> + * @master: Pointer to struct spi_master.
> + */
> +static void pch_spi_reset(struct spi_master *master)
> +{
> + /* write 1 to reset SPI */
> + pch_spi_writereg(master, PCH_SRST, 0x1);
> +
> + /* clear reset */
> + pch_spi_writereg(master, PCH_SRST, 0x0);
> +}
> +
> +static int pch_spi_setup(struct spi_device *pspi)
> +{
> + /* check bits per word */
> + if ((pspi->bits_per_word) == 0) {
> + pspi->bits_per_word = 8;
> + dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__);
> + }
> +
> + if (((pspi->bits_per_word) != 8) &&
> + ((pspi->bits_per_word != 16))) {
> + dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__);
> + return -EINVAL;
> + }
> +
> + /* Check baud rate setting */
> + /* if baud rate of chip is greater than
> + max we can support,return error */
> + if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE)
> + pspi->max_speed_hz = PCH_MAX_BAUDRATE;
> +
> + dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__,
> + ((pspi->mode) & (SPI_CPOL | SPI_CPHA)));
> +
> + return 0;
> +}
> +
> +static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg)
> +{
> +
> + struct spi_transfer *transfer;
> + struct pch_spi_data *data = spi_master_get_devdata(pspi->master);
> + int retval;
> + unsigned long flags;
> +
> + /* validate spi message and baud rate */
> + if (unlikely((list_empty(&pmsg->transfers) == 1) ||
> + (pspi->max_speed_hz == 0))) {
> + if (list_empty(&pmsg->transfers) == 1)
> + dev_err(&pspi->dev, "%s list empty\n", __func__);
> +
> + if ((pspi->max_speed_hz) == 0) {
> + dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n",
> + __func__, pspi->max_speed_hz);
> + }
> + dev_err(&pspi->dev, "%s returning EINVAL\n", __func__);
> +
> + retval = -EINVAL;
> + goto err_out;
> + }
> +
> + dev_dbg(&pspi->dev, "%s Transfer List not empty. "
> + "Transfer Speed is set.\n", __func__);
> +
> + spin_lock_irqsave(&data->lock, flags);
> +
> + /* validate Tx/Rx buffers and Transfer length */
> + list_for_each_entry(transfer, &pmsg->transfers, transfer_list) {
> + if ((!(transfer->tx_buf)) && (!(transfer->rx_buf))) {
> + dev_err(&pspi->dev,
> + "%s Tx and Rx buffer NULL\n", __func__);
> + retval = -EINVAL;
> + goto err_return_spinlock;
> + }
> +
> + if (!(transfer->len)) {
> + dev_err(&pspi->dev, "%s Transfer length invalid\n",
> + __func__);
> + retval = -EINVAL;
> + goto err_return_spinlock;
> + }
> +
> + dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length"
> + " valid\n", __func__);
> +
> + /* if baud rate hs been specified validate the same */
> + if (transfer->speed_hz) {
> + if ((transfer->speed_hz) > PCH_MAX_BAUDRATE)
> + transfer->speed_hz = PCH_MAX_BAUDRATE;
> + }
> +
> + /* if bits per word has been specified validate the same */
> + if (transfer->bits_per_word) {
> + if ((transfer->bits_per_word != 8)
> + && (transfer->bits_per_word != 16)) {
> + retval = -EINVAL;
> + dev_err(&pspi->dev,
> + "%s Invalid bits per word\n", __func__);
> + goto err_return_spinlock;
> + }
> + }
> + }
> +
> + /* We won't process any messages if we have been asked to terminate */
> +
> + if (STATUS_EXITING == (data->status)) {
> + dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__);
> + retval = -ESHUTDOWN;
> + goto err_return_spinlock;
> + }
> +
> + /* If suspended ,return -EINVAL */
> + if (data->board_dat->suspend_sts) {
> + dev_err(&pspi->dev,
> + "%s bSuspending= true returning EINVAL\n", __func__);
> + retval = -EINVAL;
> + goto err_return_spinlock;
> + }
> +
> + /* set status of message */
> + pmsg->actual_length = 0;
> +
> + dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status);
> +
> + pmsg->status = -EINPROGRESS;
> +
> + /* add message to queue */
> + list_add_tail(&pmsg->queue, &data->queue);
> +
> + dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__);
> +
> + /* schedule work queue to run */
> + queue_work(data->wk, &data->work);
> +
> + dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__);
> +
> + retval = 0;
> +
> +err_return_spinlock:
> + spin_unlock_irqrestore(&data->lock, flags);
> +err_out:
> + dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval);
> + return retval;
> +}
> +
> +static inline void pch_spi_select_chip(struct pch_spi_data *data,
> + struct spi_device *pspi)
> +{
> + if ((data->current_chip) != NULL) {
> + if ((pspi->chip_select) != (data->n_curnt_chip)) {
> + dev_dbg(&pspi->dev,
> + "%s : different slave-Invoking\n", __func__);
> + data->current_chip = NULL;
> + }
> + }
> +
> + data->current_chip = pspi;
> +
> + data->n_curnt_chip = data->current_chip->chip_select;
> +
> + dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__);
> + pch_spi_setup_transfer(pspi);
> +}
> +
> +static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw,
> + struct spi_message **ppmsg)
> +{
> + int b_mem_fail;
> + int size;
> + u32 n_writes;
> + int j;
> + struct spi_message *pmsg;
> + const u8 *tx_buf;
> + const u16 *tx_sbuf;
> +
> + pmsg = *ppmsg;
> +
> + /* set baud rate if needed */
> + if (data->cur_trans->speed_hz) {
> + dev_dbg(&data->master->dev,
> + "%s:pctrldatasetting baud rate\n", __func__);
> + pch_spi_set_baud_rate(data->master,
> + (data->cur_trans->speed_hz));
> + }
> +
> + /* set bits per word if needed */
> + if ((data->cur_trans->bits_per_word) &&
> + ((data->current_msg->spi->bits_per_word) !=
> + (data->cur_trans->bits_per_word))) {
> + dev_dbg(&data->master->dev,
> + "%s:setting bits per word\n", __func__);
> + pch_spi_set_bits_per_word(data->master,
> + (data->cur_trans->bits_per_word));
> + *bpw = data->cur_trans->bits_per_word;
> + } else {
> + *bpw = data->current_msg->spi->bits_per_word;
> + }
> +
> + /* reset Tx/Rx index */
> + data->tx_index = 0;
> + data->rx_index = 0;
> +
> + data->bpw_len = data->cur_trans->len / (*bpw / 8);
> + b_mem_fail = false;
> +
> + /* find alloc size */
> + size = (data->cur_trans->len) * (sizeof(*(data->pkt_tx_buff)));
> + /* allocate memory for pkt_tx_buff & pkt_rx_buffer */
> + data->pkt_tx_buff = kzalloc(size, GFP_KERNEL);
> +
> + if (data->pkt_tx_buff != NULL) {
> + data->pkt_rx_buff = kzalloc(size, GFP_KERNEL);
> +
> + if (data->pkt_rx_buff == NULL) {
> + b_mem_fail = true;
> + kfree(data->pkt_tx_buff);
> + }
> + } else {
> + b_mem_fail = true;
> + }
> +
> + if (b_mem_fail) {
> + /* flush queue and set status of all transfers to -ENOMEM */
> + dev_err(&data->master->dev,
> + "Kzalloc fail in %s messages\n", __func__);
> + list_for_each_entry(pmsg, data->queue.next, queue) {
> + pmsg->status = -ENOMEM;
> +
> + if (pmsg->complete != 0)
> + pmsg->complete(pmsg->context);
> +
> + /* delete from queue */
> + list_del_init(&pmsg->queue);
> + }
> +
> + return;
> + }
> +
> + /* copy Tx Data */
> + if ((data->cur_trans->tx_buf) != NULL) {
> + if (*bpw == 8) {
> + for (j = 0; j < (data->bpw_len); j++) {
> + tx_buf = data->cur_trans->tx_buf;
> + data->pkt_tx_buff[j] = tx_buf[j];
> + }
> + } else {
> + for (j = 0; j < (data->bpw_len); j++) {
> + tx_sbuf = data->cur_trans->tx_buf;
> + data->pkt_tx_buff[j] = tx_sbuf[j];
> + }
> + }
> + }
> +
> + /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */
> + if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH)
> + n_writes = PCH_MAX_FIFO_DEPTH;
> + else
> + n_writes = (data->bpw_len);
> +
> + dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing "
> + "0x2 to SSNXCR\n", __func__);
> + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW);
> +
> + for (j = 0; j < n_writes; j++) {
> + pch_spi_writereg(data->master, PCH_SPDWR,
> + data->pkt_tx_buff[j]);
> + }
> +
> + /* update tx_index */
> + data->tx_index = j;
> +
> + /* reset transfer complete flag */
> + data->transfer_complete = false;
> + data->transfer_active = true;
> +}
> +
> +
> +static void pch_spi_nomore_transfer(struct pch_spi_data *data,
> + struct spi_message *pmsg)
> +{
> + dev_dbg(&data->master->dev,
> + "%s:no more transfers in this message\n", __func__);
> + /* Invoke complete callback
> + [To the spi core..indicating end of transfer] */
> + data->current_msg->status = 0;
> +
> + if ((data->current_msg->complete) != 0) {
> + dev_dbg(&data->master->dev,
> + "%s:Invoking callback of SPI core\n", __func__);
> + data->current_msg->complete(data->current_msg->context);
> + }
> +
> + /* update status in global variable */
> + data->bcurrent_msg_processing = false;
> +
> + dev_dbg(&data->master->dev,
> + "%s:data->bcurrent_msg_processing = false\n", __func__);
> +
> + data->current_msg = NULL;
> + data->cur_trans = NULL;
> +
> + /* check if we have items in list and not suspending */
> + /* return 1 if list empty */
> + if ((list_empty(&data->queue) == 0) &&
> + (!(data->board_dat->suspend_sts))
> + && (data->status != STATUS_EXITING)) {
> + /* We have some more work to do (either there is more tranint
> + bpw;sfer requests in the current message or there are
> + more messages)
> + */
> + dev_dbg(&data->master->dev,
> + "%s:we have pending messages-Invoking queue_work\n",
> + __func__);
> + queue_work(data->wk, &data->work);
> + } else if ((data->board_dat->suspend_sts) ||
> + (data->status == STATUS_EXITING)) {
> + dev_dbg(&data->master->dev,
> + "%s suspend/remove initiated, flushing queue\n",
> + __func__);
> + list_for_each_entry(pmsg, data->queue.next, queue) {
> + pmsg->status = -EIO;
> +
> + if (pmsg->complete != 0)
> + pmsg->complete(pmsg->context);
> +
> + /* delete from queue */
> + list_del_init(&pmsg->queue);
> + }
> + }
> +}
> +
> +static void pch_spi_set_ir(struct pch_spi_data *data)
> +{
> + u32 reg_spcr_val;
> +
> + /* enable interrupts */
> + if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) {
> + /* set receive threhold to PCH_RX_THOLD */
> + pch_spi_set_threshold(data->current_chip, PCH_RX_THOLD, PCH_RX);
> + /* enable FI and RFI interrupts */
> + pch_spi_enable_interrupts(data->master, PCH_RFI | PCH_FI);
> + } else {
> + /* set receive threhold to maximum */
> + pch_spi_set_threshold(data->current_chip, PCH_RX_THOLD_MAX,
> + PCH_RX);
> + /* enable FI interrupt */
> + pch_spi_enable_interrupts(data->master, PCH_FI);
> + }
> +
> + dev_dbg(&data->master->dev,
> + "%s:invoking pch_spi_set_enable to enable SPI\n", __func__);
> +
> + /* SPI set enable */
> + reg_spcr_val = pch_spi_readreg(data->current_chip->master, PCH_SPCR);
> + pch_set_bitmsk(®_spcr_val, SPCR_SPE_BIT);
> + pch_spi_writereg(data->current_chip->master, PCH_SPCR, reg_spcr_val);
> +
> +
> + /* Wait until the transfer completes; go to sleep after
> + initiating the transfer. */
> + dev_dbg(&data->master->dev,
> + "%s:waiting for transfer to get over\n", __func__);
> +
> + wait_event_interruptible(data->wait, data->transfer_complete);
> +
> + pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL);
> + dev_dbg(&data->master->dev,
> + "%s:no more control over SSN-writing 0 to SSNXCR.", __func__);
> +
> + data->transfer_active = false;
> + dev_dbg(&data->master->dev,
> + "%s set data->transfer_active = false\n", __func__);
> +
> + /* clear all interrupts */
> + pch_spi_writereg(data->master, PCH_SPSR,
> + (pch_spi_readreg(data->master, PCH_SPSR)));
> + /* disable interrupts */
> + pch_spi_disable_interrupts(data->master, PCH_ALL);
> +}
> +
> +static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw)
> +{
> + int j;
> + u8 *rx_buf;
> + u16 *rx_sbuf;
> +
> + /* copy Rx Data */
> + if (!(data->cur_trans->rx_buf))
> + return;
> +
> + if (bpw == 8) {
> + for (j = 0; j < (data->bpw_len); j++) {
> + rx_buf = data->cur_trans->rx_buf;
> + rx_buf[j] = (data->pkt_rx_buff[j]) & 0xFF;
> + }
> + } else {
> + for (j = 0; j < (data->bpw_len); j++) {
> + rx_sbuf = data->cur_trans->rx_buf;
> + rx_sbuf[j] = data->pkt_rx_buff[j];
> + }
> + }
> +}
> +
> +
> +static void pch_spi_process_messages(struct work_struct *pwork)
> +{
> + struct spi_message *pmsg;
> + int bpw;
> +
> + struct pch_spi_data *data =
> + container_of(pwork, struct pch_spi_data, work);
> + dev_dbg(&data->master->dev, "%s data initialized\n", __func__);
> +
> + spin_lock(&data->lock);
> +
> + /* check if suspend has been initiated;if yes flush queue */
> + if ((data->board_dat->suspend_sts) ||
> + (data->status == STATUS_EXITING)) {
> + dev_dbg(&data->master->dev,
> + "%s suspend/remove initiated,flushing queue\n",
> + __func__);
> + list_for_each_entry(pmsg, data->queue.next, queue) {
> + pmsg->status = -EIO;
> +
> + if (pmsg->complete != 0) {
> + spin_unlock(&data->lock);
> + pmsg->complete(pmsg->context);
> + spin_lock(&data->lock);
> + }
> +
> + /* delete from queue */
> + list_del_init(&pmsg->queue);
> + }
> +
> + spin_unlock(&data->lock);
> + return;
> + }
> +
> + data->bcurrent_msg_processing = true;
> + dev_dbg(&data->master->dev,
> + "%s Set data->bcurrent_msg_processing= true\n", __func__);
> +
> + /* Get the message from the queue and delete it from there. */
> + data->current_msg =
> + list_entry(data->queue.next, struct spi_message, queue);
> +
> + list_del_init(&data->current_msg->queue);
> +
> + data->current_msg->status = 0;
> +
> + pch_spi_select_chip(data, data->current_msg->spi);
> +
> + spin_unlock(&data->lock);
> +
> + do {
> + /* If we are already processing a message get the next
> + transfer structure from the message otherwise retrieve
> + the 1st transfer request from the message. */
> + spin_lock(&data->lock);
> +
> + if (data->cur_trans == NULL) {
> + data->cur_trans =
> + list_entry(data->current_msg->transfers.
> + next, struct spi_transfer,
> + transfer_list);
> + dev_dbg(&data->master->dev,
> + "%s :Getting 1st transfer message\n", __func__);
> + } else {
> + data->cur_trans =
> + list_entry(data->cur_trans->transfer_list.next,
> + struct spi_transfer,
> + transfer_list);
> + dev_dbg(&data->master->dev,
> + "%s :Getting next transfer message\n",
> + __func__);
> + }
> +
> + spin_unlock(&data->lock);
> +
> + pch_spi_set_tx(data, &bpw, &pmsg);
> +
> + /* Control interrupt*/
> + pch_spi_set_ir(data);
> +
> + /* Disable SPI transfer */
> + pch_spi_setclr_reg(data->current_chip->master, PCH_SPCR, 0,
> + SPCR_SPE_BIT);
> +
> + /* clear FIFO */
> + pch_spi_clear_fifo(data->master);
> +
> + /* copy Rx Data */
> + pch_spi_copy_rx_data(data, bpw);
> +
> + /* free memory */
> + kfree(data->pkt_rx_buff);
> + data->pkt_rx_buff = NULL;
> +
> + kfree(data->pkt_tx_buff);
> + data->pkt_tx_buff = NULL;
> +
> + /* increment message count */
> + data->current_msg->actual_length += data->cur_trans->len;
> +
> + dev_dbg(&data->master->dev,
> + "%s:data->current_msg->actual_length=%d\n",
> + __func__, data->current_msg->actual_length);
> +
> + /* check for delay */
> + if (data->cur_trans->delay_usecs) {
> + dev_dbg(&data->master->dev, "%s:"
> + "delay in usec=%d\n", __func__,
> + data->cur_trans->delay_usecs);
> + udelay(data->cur_trans->delay_usecs);
> + }
> +
> + spin_lock(&data->lock);
> +
> + /* No more transfer in this message. */
> + if ((data->cur_trans->transfer_list.next) ==
> + &(data->current_msg->transfers)) {
> + pch_spi_nomore_transfer(data, pmsg);
> + }
> +
> + spin_unlock(&data->lock);
> +
> + } while ((data->cur_trans) != NULL);
> +}
> +
> +static void pch_spi_free_resources(struct pch_spi_board_data *board_dat)
> +{
> + dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
> +
> + /* free workqueue */
> + if (board_dat->data->wk != NULL) {
> + destroy_workqueue(board_dat->data->wk);
> + board_dat->data->wk = NULL;
> + dev_dbg(&board_dat->pdev->dev,
> + "%s destroy_workqueue invoked successfully\n",
> + __func__);
> + }
> +
> + /* disable interrupts & free IRQ */
> + if (board_dat->irq_reg_sts) {
> + /* disable interrupts */
> + pch_spi_disable_interrupts(board_dat->data->
> + master, PCH_ALL);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s pch_spi_disable_interrupts invoked "
> + "successfully\n", __func__);
> +
> + /* free IRQ */
> + free_irq(board_dat->pdev->irq, (void *)board_dat);
> +
> + dev_dbg(&board_dat->pdev->dev,
> + "%s free_irq invoked successfully\n", __func__);
> +
> + board_dat->irq_reg_sts = false;
> + }
> +
> + /* unmap PCI base address */
> + if ((board_dat->data->io_remap_addr) != 0) {
> + pci_iounmap(board_dat->pdev, board_dat->data->io_remap_addr);
> +
> + board_dat->data->io_remap_addr = 0;
> +
> + dev_dbg(&board_dat->pdev->dev,
> + "%s pci_iounmap invoked successfully\n", __func__);
> + }
> +
> + /* release PCI region */
> + if (board_dat->pci_req_sts) {
> + pci_release_regions(board_dat->pdev);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s pci_release_regions invoked successfully\n",
> + __func__);
> + board_dat->pci_req_sts = false;
> + }
> +}
> +
> +static int pch_spi_get_resources(struct pch_spi_board_data *board_dat)
> +{
> + void __iomem *io_remap_addr;
> + int retval;
> + dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__);
> +
> + /* iniatize queue of pending messages */
> + INIT_LIST_HEAD(&(board_dat->data->queue));
> +
> + /* initialize spin locks */
> + spin_lock_init(&(board_dat->data->lock));
> +
> + /* set channel status */
> + board_dat->data->status = STATUS_RUNNING;
> +
> + /* initialize work structure */
> + INIT_WORK(&(board_dat->data->work),
> + pch_spi_process_messages);
> +
> + /* initialize wait queues */
> + init_waitqueue_head(&(board_dat->data->wait));
> +
> + /* create workqueue */
> + board_dat->data->wk = create_singlethread_workqueue(KBUILD_MODNAME);
> +
> + if ((board_dat->data->wk) == NULL) {
> + dev_err(&board_dat->pdev->dev,
> + "%s create_singlet hread_workqueue failed\n", __func__);
> + retval = -EBUSY;
> + goto err_return;
> + }
> +
> + dev_dbg(&board_dat->pdev->dev,
> + "%s create_singlethread_workqueue success\n", __func__);
> +
> + retval = pci_request_regions(board_dat->pdev, KBUILD_MODNAME);
> + if (retval != 0) {
> + dev_err(&board_dat->pdev->dev,
> + "%s request_region failed\n", __func__);
> + goto err_return;
> + }
> +
> + board_dat->pci_req_sts = true;
> +
> + io_remap_addr = pci_iomap(board_dat->pdev, 1, 0);
> +
> + if (io_remap_addr == 0) {
> + dev_err(&board_dat->pdev->dev,
> + "%s pci_iomap failed\n", __func__);
> + retval = -ENOMEM;
> + goto err_return;
> + }
> +
> + /* calculate base address for all channels */
> + board_dat->data->io_remap_addr = io_remap_addr;
> +
> + /* reset PCH SPI h/w */
> + pch_spi_reset(board_dat->data->master);
> + dev_dbg(&board_dat->pdev->dev,
> + "%s pch_spi_reset invoked successfully\n", __func__);
> +
> + /* register IRQ */
> + retval = request_irq(board_dat->pdev->irq, pch_spi_handler,
> + IRQF_SHARED, KBUILD_MODNAME, (void *)board_dat);
> + if (retval != 0) {
> + dev_err(&board_dat->pdev->dev,
> + "%s request_irq failed\n", __func__);
> + goto err_return;
> + }
> +
> + dev_dbg(&board_dat->pdev->dev, "%s request_irq returned=%d\n",
> + __func__, retval);
> +
> + board_dat->irq_reg_sts = true;
> + dev_dbg(&board_dat->pdev->dev,
> + "%s data->irq_reg_sts=true\n", __func__);
> +
> +err_return:
> + if (retval != 0) {
> + dev_err(&board_dat->pdev->dev,
> + "%s FAIL:invoking pch_spi_free_resources\n", __func__);
> + pch_spi_free_resources(board_dat);
> + }
> +
> + dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval);
> +
> + return retval;
> +}
> +
> +static int pch_spi_check_request_pending(struct pch_spi_board_data *board_dat)
> +{
> + int sts;
> + u16 count;
> +
> + count = 500;
> + spin_lock(&(board_dat->data->lock));
> + board_dat->data->status = STATUS_EXITING;
> +
> + while ((list_empty(&(board_dat->data->queue)) == 0) &&
> + (--count)) {
> + dev_dbg(&board_dat->pdev->dev,
> + "%s :queue not empty\n", __func__);
> + spin_unlock(&(board_dat->data->lock));
> + msleep(PCH_SLEEP_TIME);
> + spin_lock(&(board_dat->data->lock));
> + }
> +
> + spin_unlock(&(board_dat->data->lock));
> +
> + if (count) {
> + sts = 0;
> + dev_dbg(&board_dat->pdev->dev, "%s :queue empty\n", __func__);
> + } else {
> + sts = -EBUSY;
> + }
> +
> + dev_dbg(&board_dat->pdev->dev, "%s : EXIT=%d\n", __func__, sts);
> +
> + return sts;
> +}
> +
> +static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> +
> + struct spi_master *master;
> +
> + struct pch_spi_board_data *board_dat;
> + int retval;
> +
> + dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
> +
> + /* allocate memory for private data */
> + board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL);
> + if (board_dat == NULL) {
> + dev_err(&pdev->dev,
> + " %s memory allocation for private data failed\n",
> + __func__);
> + retval = -ENOMEM;
> + goto err_kmalloc;
> + }
> +
> + dev_dbg(&pdev->dev,
> + "%s memory allocation for private data success\n", __func__);
> +
> + /* enable PCI device */
> + retval = pci_enable_device(pdev);
> + if (retval != 0) {
> + dev_err(&pdev->dev, "%s pci_enable_device FAILED\n", __func__);
> +
> + goto err_pci_en_device;
> + }
> +
> + dev_dbg(&pdev->dev, "%s pci_enable_device returned=%d\n",
> + __func__, retval);
> +
> + board_dat->pdev = pdev;
> +
> + /* alllocate memory for SPI master */
> + master = spi_alloc_master(&pdev->dev, sizeof(struct pch_spi_data));
> + if (master == NULL) {
> + retval = -ENOMEM;
> + dev_err(&pdev->dev, "%s Fail.\n", __func__);
> + goto err_spi_alloc_master;
> + }
> +
> + dev_dbg(&pdev->dev,
> + "%s spi_alloc_master returned non NULL\n", __func__);
> +
> + /* initialize members of SPI master */
> + master->bus_num = -1;
> + master->num_chipselect = PCH_MAX_CS;
> + master->setup = pch_spi_setup;
> + master->transfer = pch_spi_transfer;
> + dev_dbg(&pdev->dev,
> + "%s transfer member of SPI master initialized\n", __func__);
> +
> + board_dat->data = spi_master_get_devdata(master);
> +
> + board_dat->data->master = master;
> + board_dat->data->n_curnt_chip = 255;
> + board_dat->data->board_dat = board_dat;
> +
> + /* allocate resources for PCH SPI */
> + retval = pch_spi_get_resources(board_dat);
> + if (retval != 0) {
> + dev_err(&pdev->dev, "%s fail(retval=%d)\n",
> + __func__, retval);
> + goto err_spi_get_resources;
> + }
> +
> + dev_dbg(&pdev->dev, "%s pch_spi_get_resources returned=%d\n",
> + __func__, retval);
> +
> + /* save private data in dev */
> + pci_set_drvdata(pdev, (void *)board_dat);
> + dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__);
> +
> + /* set master mode */
> + pch_spi_set_master_mode(master);
> + dev_dbg(&pdev->dev,
> + "%s invoked pch_spi_set_master_mode\n", __func__);
> +
> + /* Register the controller with the SPI core. */
> + retval = spi_register_master(master);
> + if (retval != 0) {
> + dev_err(&pdev->dev,
> + "%s spi_register_master FAILED\n", __func__);
> + goto err_spi_reg_master;
> + }
> +
> + dev_dbg(&pdev->dev, "%s spi_register_master returned=%d\n",
> + __func__, retval);
> +
> +
> + return 0;
> +
> +err_spi_reg_master:
> + spi_unregister_master(master);
> +err_spi_get_resources:
> +err_spi_alloc_master:
> + spi_master_put(master);
> + pci_disable_device(pdev);
> +err_pci_en_device:
> + kfree(board_dat);
> +err_kmalloc:
> + return retval;
> +}
> +
> +static void pch_spi_remove(struct pci_dev *pdev)
> +{
> + struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev);
> +
> + dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
> +
> + if (!board_dat) {
> + dev_err(&pdev->dev,
> + "%s pci_get_drvdata returned NULL\n", __func__);
> + return;
> + }
> +
> + /* check for any pending messages */
> + if ((-EBUSY) == pch_spi_check_request_pending(board_dat)) {
> + dev_dbg(&pdev->dev,
> + "%s pch_spi_check_request_pending returned"
> + " EBUSY\n", __func__);
> + /* no need to take any particular action; proceed with remove
> + even though queue is not empty */
> + }
> +
> + /* Free resources allocated for PCH SPI */
> + pch_spi_free_resources(board_dat);
> +
> + /* Unregister SPI master */
> + spi_unregister_master(board_dat->data->master);
> +
> + /* free memory for private data */
> + kfree(board_dat);
> +
> + pci_set_drvdata(pdev, NULL);
> +
> + /* disable PCI device */
> + pci_disable_device(pdev);
> +
> + dev_dbg(&pdev->dev, "%s invoked pci_disable_device\n", __func__);
> +}
> +
> +#ifdef CONFIG_PM
> +static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state)
> +{
> + u8 count;
> + int retval;
> +
> + struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev);
> +
> + dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
> +
> + if (!board_dat) {
> + dev_err(&pdev->dev,
> + "%s pci_get_drvdata returned NULL\n", __func__);
> + return -EFAULT;
> + }
> +
> + retval = 0;
> + board_dat->suspend_sts = true;
> +
> + /* check if the current message is processed:
> + Only after thats done the transfer will be suspended */
> + count = 255;
> + while ((--count) > 0) {
> + if (!(board_dat->data->bcurrent_msg_processing)) {
> + dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_"
> + "msg_processing = false\n", __func__);
> + break;
> + } else {
> + dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_msg_"
> + "processing = true\n", __func__);
> + }
> + msleep(PCH_SLEEP_TIME);
> + }
> +
> + /* Free IRQ */
> + if (board_dat->irq_reg_sts) {
> + /* disable all interrupts */
> + pch_spi_disable_interrupts(board_dat->data->master, PCH_ALL);
> + pch_spi_reset(board_dat->data->master);
> + dev_dbg(&pdev->dev,
> + "%s pch_spi_disable_interrupts invoked successfully\n",
> + __func__);
> +
> + free_irq(board_dat->pdev->irq, (void *)board_dat);
> +
> + board_dat->irq_reg_sts = false;
> + dev_dbg(&pdev->dev,
> + "%s free_irq invoked successfully.\n", __func__);
> + }
> +
> + /* save config space */
> + retval = pci_save_state(pdev);
> +
> + if (retval == 0) {
> + dev_dbg(&pdev->dev, "%s pci_save_state returned=%d\n",
> + __func__, retval);
> + /* disable PM notifications */
> + pci_enable_wake(pdev, PCI_D3hot, 0);
> + dev_dbg(&pdev->dev,
> + "%s pci_enable_wake invoked successfully\n", __func__);
> + /* disable PCI device */
> + pci_disable_device(pdev);
> + dev_dbg(&pdev->dev,
> + "%s pci_disable_device invoked successfully\n",
> + __func__);
> + /* move device to D3hot state */
> + pci_set_power_state(pdev, PCI_D3hot);
> + dev_dbg(&pdev->dev,
> + "%s pci_set_power_state invoked successfully\n",
> + __func__);
> + } else {
> + dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__);
> + }
> +
> + dev_dbg(&pdev->dev, "%s return=%d\n", __func__, retval);
> +
> + return retval;
> +}
> +
> +static int pch_spi_resume(struct pci_dev *pdev)
> +{
> + int retval;
> +
> + struct pch_spi_board_data *board = pci_get_drvdata(pdev);
> + dev_dbg(&pdev->dev, "%s ENTRY\n", __func__);
> +
> + if (!board) {
> + dev_err(&pdev->dev,
> + "%s pci_get_drvdata returned NULL\n", __func__);
> + return -EFAULT;
> + }
> +
> + /* move device to DO power state */
> + pci_set_power_state(pdev, PCI_D0);
> +
> + /* restore state */
> + pci_restore_state(pdev);
> +
> + retval = pci_enable_device(pdev);
> + if (retval < 0) {
> + dev_err(&pdev->dev,
> + "%s pci_enable_device failed\n", __func__);
> + } else {
> + /* disable PM notifications */
> + pci_enable_wake(pdev, PCI_D3hot, 0);
> +
> + /* register IRQ handler */
> + if (!(board->irq_reg_sts)) {
> + /* register IRQ */
> + retval = request_irq(board->pdev->irq, pch_spi_handler,
> + IRQF_SHARED, KBUILD_MODNAME,
> + board);
> + if (retval < 0) {
> + dev_err(&pdev->dev,
> + "%s request_irq failed\n", __func__);
> + return retval;
> + }
> + board->irq_reg_sts = true;
> +
> + /* reset PCH SPI h/w */
> + pch_spi_reset(board->data->master);
> + pch_spi_set_master_mode(board->data->master);
> +
> + /* set suspend status to false */
> + board->suspend_sts = false;
> +
> + }
> + }
> +
> + dev_dbg(&pdev->dev, "%s returning=%d\n", __func__, retval);
> +
> + return retval;
> +}
> +#else
> +#define pch_spi_suspend NULL
> +#define pch_spi_resume NULL
> +
> +#endif
> +
> +static struct pci_driver pch_spi_pcidev = {
> + .name = "pch_spi",
> + .id_table = pch_spi_pcidev_id,
> + .probe = pch_spi_probe,
> + .remove = pch_spi_remove,
> + .suspend = pch_spi_suspend,
> + .resume = pch_spi_resume,
> +};
> +
> +static int __init pch_spi_init(void)
> +{
> + return pci_register_driver(&pch_spi_pcidev);
> +}
> +module_init(pch_spi_init);
> +
> +
> +static void __exit pch_spi_exit(void)
> +{
> + pci_unregister_driver(&pch_spi_pcidev);
> +}
> +module_exit(pch_spi_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("PCH SPI PCI Driver");
> --
> 1.6.0.6
>
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