diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/spi/spi-topcliff-pch.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/spi/spi-topcliff-pch.c | 1814 |
1 files changed, 0 insertions, 1814 deletions
diff --git a/ANDROID_3.4.5/drivers/spi/spi-topcliff-pch.c b/ANDROID_3.4.5/drivers/spi/spi-topcliff-pch.c deleted file mode 100644 index ec47d3bd..00000000 --- a/ANDROID_3.4.5/drivers/spi/spi-topcliff-pch.c +++ /dev/null @@ -1,1814 +0,0 @@ -/* - * SPI bus driver for the Topcliff PCH used by Intel SoCs - * - * Copyright (C) 2011 LAPIS 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/delay.h> -#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> -#include <linux/platform_device.h> - -#include <linux/dmaengine.h> -#include <linux/pch_dma.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_ADDRESS_SIZE 0x20 - -#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_TX_THOLD 2 - -#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 SSN_LOW 0x02U -#define SSN_HIGH 0x03U -#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 SPSR_ORF_BIT (1 << 3) -#define SPBRR_SIZE_BIT (1 << 10) - -#define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|\ - SPCR_ORIE_BIT|SPCR_MDFIE_BIT) - -#define SPCR_RFIC_FIELD 20 -#define SPCR_TFIC_FIELD 16 - -#define MASK_SPBRR_SPBR_BITS ((1 << 10) - 1) -#define MASK_RFIC_SPCR_BITS (0xf << SPCR_RFIC_FIELD) -#define MASK_TFIC_SPCR_BITS (0xf << SPCR_TFIC_FIELD) - -#define PCH_CLOCK_HZ 50000000 -#define PCH_MAX_SPBR 1023 - -/* Definition for ML7213/ML7223/ML7831 by LAPIS Semiconductor */ -#define PCI_VENDOR_ID_ROHM 0x10DB -#define PCI_DEVICE_ID_ML7213_SPI 0x802c -#define PCI_DEVICE_ID_ML7223_SPI 0x800F -#define PCI_DEVICE_ID_ML7831_SPI 0x8816 - -/* - * Set the number of SPI instance max - * Intel EG20T PCH : 1ch - * LAPIS Semiconductor ML7213 IOH : 2ch - * LAPIS Semiconductor ML7223 IOH : 1ch - * LAPIS Semiconductor ML7831 IOH : 1ch -*/ -#define PCH_SPI_MAX_DEV 2 - -#define PCH_BUF_SIZE 4096 -#define PCH_DMA_TRANS_SIZE 12 - -static int use_dma = 1; - -struct pch_spi_dma_ctrl { - struct dma_async_tx_descriptor *desc_tx; - struct dma_async_tx_descriptor *desc_rx; - struct pch_dma_slave param_tx; - struct pch_dma_slave param_rx; - struct dma_chan *chan_tx; - struct dma_chan *chan_rx; - struct scatterlist *sg_tx_p; - struct scatterlist *sg_rx_p; - struct scatterlist sg_tx; - struct scatterlist sg_rx; - int nent; - void *tx_buf_virt; - void *rx_buf_virt; - dma_addr_t tx_buf_dma; - dma_addr_t rx_buf_dma; -}; -/** - * 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 - * @plat_dev: platform_device structure - * @ch: SPI channel number - * @irq_reg_sts: Status of IRQ registration - */ -struct pch_spi_data { - void __iomem *io_remap_addr; - unsigned long io_base_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 platform_device *plat_dev; - int ch; - struct pch_spi_dma_ctrl dma; - int use_dma; - u8 irq_reg_sts; - int save_total_len; -}; - -/** - * struct pch_spi_board_data - Holds the SPI device specific details - * @pdev: Pointer to the PCI device - * @suspend_sts: Status of suspend - * @num: The number of SPI device instance - */ -struct pch_spi_board_data { - struct pci_dev *pdev; - u8 suspend_sts; - int num; -}; - -struct pch_pd_dev_save { - int num; - struct platform_device *pd_save[PCH_SPI_MAX_DEV]; - struct pch_spi_board_data *board_dat; -}; - -static DEFINE_PCI_DEVICE_TABLE(pch_spi_pcidev_id) = { - { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_GE_SPI), 1, }, - { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_SPI), 2, }, - { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_SPI), 1, }, - { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_SPI), 1, }, - { } -}; - -/** - * 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); -} - -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); -} - -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); - reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ - - /* reset rx threshold */ - reg_spcr_val &= ~MASK_RFIC_SPCR_BITS; - reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD); - - iowrite32(reg_spcr_val, (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) { - if ((tx_index == bpw_len) && (rx_index == tx_index)) { - /* disable interrupts */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, - PCH_ALL); - - /* transfer is completed; - inform pch_spi_process_messages */ - data->transfer_complete = true; - data->transfer_active = false; - wake_up(&data->wait); - } else { - dev_err(&data->master->dev, - "%s : Transfer is not completed", - __func__); - } - } - } -} - -/** - * 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; - void __iomem *spsr; - void __iomem *io_remap_addr; - irqreturn_t ret = IRQ_NONE; - struct pch_spi_data *data = dev_id; - struct pch_spi_board_data *board_dat = data->board_dat; - - if (board_dat->suspend_sts) { - dev_dbg(&board_dat->pdev->dev, - "%s returning due to suspend\n", __func__); - return IRQ_NONE; - } - - io_remap_addr = data->io_remap_addr; - spsr = io_remap_addr + PCH_SPSR; - - reg_spsr_val = ioread32(spsr); - - if (reg_spsr_val & SPSR_ORF_BIT) { - dev_err(&board_dat->pdev->dev, "%s Over run error\n", __func__); - if (data->current_msg->complete != 0) { - data->transfer_complete = true; - data->current_msg->status = -EIO; - data->current_msg->complete(data->current_msg->context); - data->bcurrent_msg_processing = false; - data->current_msg = NULL; - data->cur_trans = NULL; - } - } - - if (data->use_dma) - return IRQ_NONE; - - /* 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 = 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 flags = 0; - - 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)) - flags |= SPCR_LSBF_BIT; - if (spi->mode & SPI_CPOL) - flags |= SPCR_CPOL_BIT; - if (spi->mode & SPI_CPHA) - flags |= SPCR_CPHA_BIT; - pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, - (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT)); - - /* Clear the FIFO by toggling FICLR to 1 and back to 0 */ - pch_spi_clear_fifo(spi->master); -} - -/** - * 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)) { - dev_err(&pspi->dev, "%s list empty\n", __func__); - retval = -EINVAL; - goto err_out; - } - - if (unlikely(pspi->max_speed_hz == 0)) { - dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n", - __func__, pspi->max_speed_hz); - 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 has been specified validate the same */ - 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; - } - } - } - spin_unlock_irqrestore(&data->lock, flags); - - /* We won't process any messages if we have been asked to terminate */ - if (data->status == STATUS_EXITING) { - dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); - retval = -ESHUTDOWN; - goto err_out; - } - - /* If suspended ,return -EINVAL */ - if (data->board_dat->suspend_sts) { - dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); - retval = -EINVAL; - goto err_out; - } - - /* set status of message */ - pmsg->actual_length = 0; - dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); - - pmsg->status = -EINPROGRESS; - spin_lock_irqsave(&data->lock, flags); - /* add message to queue */ - list_add_tail(&pmsg->queue, &data->queue); - spin_unlock_irqrestore(&data->lock, flags); - - 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_out: - dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); - return retval; -err_return_spinlock: - dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); - spin_unlock_irqrestore(&data->lock, flags); - 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\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) -{ - int size; - u32 n_writes; - int j; - struct spi_message *pmsg; - const u8 *tx_buf; - const u16 *tx_sbuf; - - /* set baud rate if needed */ - if (data->cur_trans->speed_hz) { - dev_dbg(&data->master->dev, "%s:setting 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:set 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); - - /* 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) - kfree(data->pkt_tx_buff); - } - - if (!data->pkt_rx_buff) { - /* flush queue and set status of all transfers to -ENOMEM */ - dev_err(&data->master->dev, "%s :kzalloc failed\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) { - tx_buf = data->cur_trans->tx_buf; - for (j = 0; j < data->bpw_len; j++) - data->pkt_tx_buff[j] = *tx_buf++; - } else { - tx_sbuf = data->cur_trans->tx_buf; - for (j = 0; j < data->bpw_len; j++) - data->pkt_tx_buff[j] = *tx_sbuf++; - } - } - - /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */ - n_writes = data->bpw_len; - if (n_writes > PCH_MAX_FIFO_DEPTH) - n_writes = PCH_MAX_FIFO_DEPTH; - - 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 called\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:Invoke 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) - pmsg->complete(pmsg->context); - - /* delete from queue */ - list_del_init(&pmsg->queue); - } - } -} - -static void pch_spi_set_ir(struct pch_spi_data *data) -{ - /* enable interrupts, set threshold, enable SPI */ - if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) - /* set receive threshold to PCH_RX_THOLD */ - pch_spi_setclr_reg(data->master, PCH_SPCR, - PCH_RX_THOLD << SPCR_RFIC_FIELD | - SPCR_FIE_BIT | SPCR_RFIE_BIT | - SPCR_ORIE_BIT | SPCR_SPE_BIT, - MASK_RFIC_SPCR_BITS | PCH_ALL); - else - /* set receive threshold to maximum */ - pch_spi_setclr_reg(data->master, PCH_SPCR, - PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD | - SPCR_FIE_BIT | SPCR_ORIE_BIT | - SPCR_SPE_BIT, - MASK_RFIC_SPCR_BITS | PCH_ALL); - - /* 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); - - /* clear all interrupts */ - pch_spi_writereg(data->master, PCH_SPSR, - pch_spi_readreg(data->master, PCH_SPSR)); - /* Disable interrupts and SPI transfer */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL | SPCR_SPE_BIT); - /* clear FIFO */ - pch_spi_clear_fifo(data->master); -} - -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) { - rx_buf = data->cur_trans->rx_buf; - for (j = 0; j < data->bpw_len; j++) - *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; - } else { - rx_sbuf = data->cur_trans->rx_buf; - for (j = 0; j < data->bpw_len; j++) - *rx_sbuf++ = data->pkt_rx_buff[j]; - } -} - -static void pch_spi_copy_rx_data_for_dma(struct pch_spi_data *data, int bpw) -{ - int j; - u8 *rx_buf; - u16 *rx_sbuf; - const u8 *rx_dma_buf; - const u16 *rx_dma_sbuf; - - /* copy Rx Data */ - if (!data->cur_trans->rx_buf) - return; - - if (bpw == 8) { - rx_buf = data->cur_trans->rx_buf; - rx_dma_buf = data->dma.rx_buf_virt; - for (j = 0; j < data->bpw_len; j++) - *rx_buf++ = *rx_dma_buf++ & 0xFF; - data->cur_trans->rx_buf = rx_buf; - } else { - rx_sbuf = data->cur_trans->rx_buf; - rx_dma_sbuf = data->dma.rx_buf_virt; - for (j = 0; j < data->bpw_len; j++) - *rx_sbuf++ = *rx_dma_sbuf++; - data->cur_trans->rx_buf = rx_sbuf; - } -} - -static int pch_spi_start_transfer(struct pch_spi_data *data) -{ - struct pch_spi_dma_ctrl *dma; - unsigned long flags; - int rtn; - - dma = &data->dma; - - spin_lock_irqsave(&data->lock, flags); - - /* disable interrupts, SPI set enable */ - pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_SPE_BIT, PCH_ALL); - - spin_unlock_irqrestore(&data->lock, flags); - - /* 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__); - rtn = wait_event_interruptible_timeout(data->wait, - data->transfer_complete, - msecs_to_jiffies(2 * HZ)); - if (!rtn) - dev_err(&data->master->dev, - "%s wait-event timeout\n", __func__); - - dma_sync_sg_for_cpu(&data->master->dev, dma->sg_rx_p, dma->nent, - DMA_FROM_DEVICE); - - dma_sync_sg_for_cpu(&data->master->dev, dma->sg_tx_p, dma->nent, - DMA_FROM_DEVICE); - memset(data->dma.tx_buf_virt, 0, PAGE_SIZE); - - async_tx_ack(dma->desc_rx); - async_tx_ack(dma->desc_tx); - kfree(dma->sg_tx_p); - kfree(dma->sg_rx_p); - - spin_lock_irqsave(&data->lock, flags); - - /* clear fifo threshold, disable interrupts, disable SPI transfer */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, - MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS | PCH_ALL | - SPCR_SPE_BIT); - /* clear all interrupts */ - pch_spi_writereg(data->master, PCH_SPSR, - pch_spi_readreg(data->master, PCH_SPSR)); - /* clear FIFO */ - pch_spi_clear_fifo(data->master); - - spin_unlock_irqrestore(&data->lock, flags); - - return rtn; -} - -static void pch_dma_rx_complete(void *arg) -{ - struct pch_spi_data *data = arg; - - /* transfer is completed;inform pch_spi_process_messages_dma */ - data->transfer_complete = true; - wake_up_interruptible(&data->wait); -} - -static bool pch_spi_filter(struct dma_chan *chan, void *slave) -{ - struct pch_dma_slave *param = slave; - - if ((chan->chan_id == param->chan_id) && - (param->dma_dev == chan->device->dev)) { - chan->private = param; - return true; - } else { - return false; - } -} - -static void pch_spi_request_dma(struct pch_spi_data *data, int bpw) -{ - dma_cap_mask_t mask; - struct dma_chan *chan; - struct pci_dev *dma_dev; - struct pch_dma_slave *param; - struct pch_spi_dma_ctrl *dma; - unsigned int width; - - if (bpw == 8) - width = PCH_DMA_WIDTH_1_BYTE; - else - width = PCH_DMA_WIDTH_2_BYTES; - - dma = &data->dma; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - - /* Get DMA's dev information */ - dma_dev = pci_get_bus_and_slot(data->board_dat->pdev->bus->number, - PCI_DEVFN(12, 0)); - - /* Set Tx DMA */ - param = &dma->param_tx; - param->dma_dev = &dma_dev->dev; - param->chan_id = data->master->bus_num * 2; /* Tx = 0, 2 */ - param->tx_reg = data->io_base_addr + PCH_SPDWR; - param->width = width; - chan = dma_request_channel(mask, pch_spi_filter, param); - if (!chan) { - dev_err(&data->master->dev, - "ERROR: dma_request_channel FAILS(Tx)\n"); - data->use_dma = 0; - return; - } - dma->chan_tx = chan; - - /* Set Rx DMA */ - param = &dma->param_rx; - param->dma_dev = &dma_dev->dev; - param->chan_id = data->master->bus_num * 2 + 1; /* Rx = Tx + 1 */ - param->rx_reg = data->io_base_addr + PCH_SPDRR; - param->width = width; - chan = dma_request_channel(mask, pch_spi_filter, param); - if (!chan) { - dev_err(&data->master->dev, - "ERROR: dma_request_channel FAILS(Rx)\n"); - dma_release_channel(dma->chan_tx); - dma->chan_tx = NULL; - data->use_dma = 0; - return; - } - dma->chan_rx = chan; -} - -static void pch_spi_release_dma(struct pch_spi_data *data) -{ - struct pch_spi_dma_ctrl *dma; - - dma = &data->dma; - if (dma->chan_tx) { - dma_release_channel(dma->chan_tx); - dma->chan_tx = NULL; - } - if (dma->chan_rx) { - dma_release_channel(dma->chan_rx); - dma->chan_rx = NULL; - } - return; -} - -static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw) -{ - const u8 *tx_buf; - const u16 *tx_sbuf; - u8 *tx_dma_buf; - u16 *tx_dma_sbuf; - struct scatterlist *sg; - struct dma_async_tx_descriptor *desc_tx; - struct dma_async_tx_descriptor *desc_rx; - int num; - int i; - int size; - int rem; - int head; - unsigned long flags; - struct pch_spi_dma_ctrl *dma; - - dma = &data->dma; - - /* set baud rate if needed */ - if (data->cur_trans->speed_hz) { - dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); - spin_lock_irqsave(&data->lock, flags); - pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); - spin_unlock_irqrestore(&data->lock, flags); - } - - /* 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:set bits per word\n", __func__); - spin_lock_irqsave(&data->lock, flags); - pch_spi_set_bits_per_word(data->master, - data->cur_trans->bits_per_word); - spin_unlock_irqrestore(&data->lock, flags); - *bpw = data->cur_trans->bits_per_word; - } else { - *bpw = data->current_msg->spi->bits_per_word; - } - data->bpw_len = data->cur_trans->len / (*bpw / 8); - - if (data->bpw_len > PCH_BUF_SIZE) { - data->bpw_len = PCH_BUF_SIZE; - data->cur_trans->len -= PCH_BUF_SIZE; - } - - /* copy Tx Data */ - if (data->cur_trans->tx_buf != NULL) { - if (*bpw == 8) { - tx_buf = data->cur_trans->tx_buf; - tx_dma_buf = dma->tx_buf_virt; - for (i = 0; i < data->bpw_len; i++) - *tx_dma_buf++ = *tx_buf++; - } else { - tx_sbuf = data->cur_trans->tx_buf; - tx_dma_sbuf = dma->tx_buf_virt; - for (i = 0; i < data->bpw_len; i++) - *tx_dma_sbuf++ = *tx_sbuf++; - } - } - - /* Calculate Rx parameter for DMA transmitting */ - if (data->bpw_len > PCH_DMA_TRANS_SIZE) { - if (data->bpw_len % PCH_DMA_TRANS_SIZE) { - num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; - rem = data->bpw_len % PCH_DMA_TRANS_SIZE; - } else { - num = data->bpw_len / PCH_DMA_TRANS_SIZE; - rem = PCH_DMA_TRANS_SIZE; - } - size = PCH_DMA_TRANS_SIZE; - } else { - num = 1; - size = data->bpw_len; - rem = data->bpw_len; - } - dev_dbg(&data->master->dev, "%s num=%d size=%d rem=%d\n", - __func__, num, size, rem); - spin_lock_irqsave(&data->lock, flags); - - /* set receive fifo threshold and transmit fifo threshold */ - pch_spi_setclr_reg(data->master, PCH_SPCR, - ((size - 1) << SPCR_RFIC_FIELD) | - (PCH_TX_THOLD << SPCR_TFIC_FIELD), - MASK_RFIC_SPCR_BITS | MASK_TFIC_SPCR_BITS); - - spin_unlock_irqrestore(&data->lock, flags); - - /* RX */ - dma->sg_rx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); - sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */ - /* offset, length setting */ - sg = dma->sg_rx_p; - for (i = 0; i < num; i++, sg++) { - if (i == (num - 2)) { - sg->offset = size * i; - sg->offset = sg->offset * (*bpw / 8); - sg_set_page(sg, virt_to_page(dma->rx_buf_virt), rem, - sg->offset); - sg_dma_len(sg) = rem; - } else if (i == (num - 1)) { - sg->offset = size * (i - 1) + rem; - sg->offset = sg->offset * (*bpw / 8); - sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, - sg->offset); - sg_dma_len(sg) = size; - } else { - sg->offset = size * i; - sg->offset = sg->offset * (*bpw / 8); - sg_set_page(sg, virt_to_page(dma->rx_buf_virt), size, - sg->offset); - sg_dma_len(sg) = size; - } - sg_dma_address(sg) = dma->rx_buf_dma + sg->offset; - } - sg = dma->sg_rx_p; - desc_rx = dmaengine_prep_slave_sg(dma->chan_rx, sg, - num, DMA_DEV_TO_MEM, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc_rx) { - dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", - __func__); - return; - } - dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_FROM_DEVICE); - desc_rx->callback = pch_dma_rx_complete; - desc_rx->callback_param = data; - dma->nent = num; - dma->desc_rx = desc_rx; - - /* Calculate Tx parameter for DMA transmitting */ - if (data->bpw_len > PCH_MAX_FIFO_DEPTH) { - head = PCH_MAX_FIFO_DEPTH - PCH_DMA_TRANS_SIZE; - if (data->bpw_len % PCH_DMA_TRANS_SIZE > 4) { - num = data->bpw_len / PCH_DMA_TRANS_SIZE + 1; - rem = data->bpw_len % PCH_DMA_TRANS_SIZE - head; - } else { - num = data->bpw_len / PCH_DMA_TRANS_SIZE; - rem = data->bpw_len % PCH_DMA_TRANS_SIZE + - PCH_DMA_TRANS_SIZE - head; - } - size = PCH_DMA_TRANS_SIZE; - } else { - num = 1; - size = data->bpw_len; - rem = data->bpw_len; - head = 0; - } - - dma->sg_tx_p = kzalloc(sizeof(struct scatterlist)*num, GFP_ATOMIC); - sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */ - /* offset, length setting */ - sg = dma->sg_tx_p; - for (i = 0; i < num; i++, sg++) { - if (i == 0) { - sg->offset = 0; - sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size + head, - sg->offset); - sg_dma_len(sg) = size + head; - } else if (i == (num - 1)) { - sg->offset = head + size * i; - sg->offset = sg->offset * (*bpw / 8); - sg_set_page(sg, virt_to_page(dma->tx_buf_virt), rem, - sg->offset); - sg_dma_len(sg) = rem; - } else { - sg->offset = head + size * i; - sg->offset = sg->offset * (*bpw / 8); - sg_set_page(sg, virt_to_page(dma->tx_buf_virt), size, - sg->offset); - sg_dma_len(sg) = size; - } - sg_dma_address(sg) = dma->tx_buf_dma + sg->offset; - } - sg = dma->sg_tx_p; - desc_tx = dmaengine_prep_slave_sg(dma->chan_tx, - sg, num, DMA_MEM_TO_DEV, - DMA_PREP_INTERRUPT | DMA_CTRL_ACK); - if (!desc_tx) { - dev_err(&data->master->dev, "%s:device_prep_slave_sg Failed\n", - __func__); - return; - } - dma_sync_sg_for_device(&data->master->dev, sg, num, DMA_TO_DEVICE); - desc_tx->callback = NULL; - desc_tx->callback_param = data; - dma->nent = num; - dma->desc_tx = desc_tx; - - dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " - "0x2 to SSNXCR\n", __func__); - - spin_lock_irqsave(&data->lock, flags); - pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); - desc_rx->tx_submit(desc_rx); - desc_tx->tx_submit(desc_tx); - spin_unlock_irqrestore(&data->lock, flags); - - /* reset transfer complete flag */ - data->transfer_complete = false; -} - -static void pch_spi_process_messages(struct work_struct *pwork) -{ - struct spi_message *pmsg; - struct pch_spi_data *data; - int bpw; - - 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); - - if (data->use_dma) - pch_spi_request_dma(data, - data->current_msg->spi->bits_per_word); - pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); - do { - int cnt; - /* 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); - - if (!data->cur_trans->len) - goto out; - cnt = (data->cur_trans->len - 1) / PCH_BUF_SIZE + 1; - data->save_total_len = data->cur_trans->len; - if (data->use_dma) { - int i; - char *save_rx_buf = data->cur_trans->rx_buf; - for (i = 0; i < cnt; i ++) { - pch_spi_handle_dma(data, &bpw); - if (!pch_spi_start_transfer(data)) { - data->transfer_complete = true; - data->current_msg->status = -EIO; - data->current_msg->complete - (data->current_msg->context); - data->bcurrent_msg_processing = false; - data->current_msg = NULL; - data->cur_trans = NULL; - goto out; - } - pch_spi_copy_rx_data_for_dma(data, bpw); - } - data->cur_trans->rx_buf = save_rx_buf; - } else { - pch_spi_set_tx(data, &bpw); - pch_spi_set_ir(data); - pch_spi_copy_rx_data(data, bpw); - kfree(data->pkt_rx_buff); - data->pkt_rx_buff = NULL; - kfree(data->pkt_tx_buff); - data->pkt_tx_buff = NULL; - } - /* increment message count */ - data->cur_trans->len = data->save_total_len; - 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); - } - - spin_unlock(&data->lock); - - } while (data->cur_trans != NULL); - -out: - pch_spi_writereg(data->master, PCH_SSNXCR, SSN_HIGH); - if (data->use_dma) - pch_spi_release_dma(data); -} - -static void pch_spi_free_resources(struct pch_spi_board_data *board_dat, - struct pch_spi_data *data) -{ - dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); - - /* free workqueue */ - if (data->wk != NULL) { - destroy_workqueue(data->wk); - data->wk = NULL; - dev_dbg(&board_dat->pdev->dev, - "%s destroy_workqueue invoked successfully\n", - __func__); - } -} - -static int pch_spi_get_resources(struct pch_spi_board_data *board_dat, - struct pch_spi_data *data) -{ - int retval = 0; - - dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); - - /* create workqueue */ - data->wk = create_singlethread_workqueue(KBUILD_MODNAME); - if (!data->wk) { - dev_err(&board_dat->pdev->dev, - "%s create_singlet hread_workqueue failed\n", __func__); - retval = -EBUSY; - goto err_return; - } - - /* reset PCH SPI h/w */ - pch_spi_reset(data->master); - dev_dbg(&board_dat->pdev->dev, - "%s pch_spi_reset invoked successfully\n", __func__); - - 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, data); - } - - dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval); - - return retval; -} - -static void pch_free_dma_buf(struct pch_spi_board_data *board_dat, - struct pch_spi_data *data) -{ - struct pch_spi_dma_ctrl *dma; - - dma = &data->dma; - if (dma->tx_buf_dma) - dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, - dma->tx_buf_virt, dma->tx_buf_dma); - if (dma->rx_buf_dma) - dma_free_coherent(&board_dat->pdev->dev, PCH_BUF_SIZE, - dma->rx_buf_virt, dma->rx_buf_dma); - return; -} - -static void pch_alloc_dma_buf(struct pch_spi_board_data *board_dat, - struct pch_spi_data *data) -{ - struct pch_spi_dma_ctrl *dma; - - dma = &data->dma; - /* Get Consistent memory for Tx DMA */ - dma->tx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, - PCH_BUF_SIZE, &dma->tx_buf_dma, GFP_KERNEL); - /* Get Consistent memory for Rx DMA */ - dma->rx_buf_virt = dma_alloc_coherent(&board_dat->pdev->dev, - PCH_BUF_SIZE, &dma->rx_buf_dma, GFP_KERNEL); -} - -static int __devinit pch_spi_pd_probe(struct platform_device *plat_dev) -{ - int ret; - struct spi_master *master; - struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); - struct pch_spi_data *data; - - dev_dbg(&plat_dev->dev, "%s:debug\n", __func__); - - master = spi_alloc_master(&board_dat->pdev->dev, - sizeof(struct pch_spi_data)); - if (!master) { - dev_err(&plat_dev->dev, "spi_alloc_master[%d] failed.\n", - plat_dev->id); - return -ENOMEM; - } - - data = spi_master_get_devdata(master); - data->master = master; - - platform_set_drvdata(plat_dev, data); - - /* baseaddress + address offset) */ - data->io_base_addr = pci_resource_start(board_dat->pdev, 1) + - PCH_ADDRESS_SIZE * plat_dev->id; - data->io_remap_addr = pci_iomap(board_dat->pdev, 1, 0) + - PCH_ADDRESS_SIZE * plat_dev->id; - if (!data->io_remap_addr) { - dev_err(&plat_dev->dev, "%s pci_iomap failed\n", __func__); - ret = -ENOMEM; - goto err_pci_iomap; - } - - dev_dbg(&plat_dev->dev, "[ch%d] remap_addr=%p\n", - plat_dev->id, data->io_remap_addr); - - /* 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; - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; - - data->board_dat = board_dat; - data->plat_dev = plat_dev; - data->n_curnt_chip = 255; - data->status = STATUS_RUNNING; - data->ch = plat_dev->id; - data->use_dma = use_dma; - - INIT_LIST_HEAD(&data->queue); - spin_lock_init(&data->lock); - INIT_WORK(&data->work, pch_spi_process_messages); - init_waitqueue_head(&data->wait); - - ret = pch_spi_get_resources(board_dat, data); - if (ret) { - dev_err(&plat_dev->dev, "%s fail(retval=%d)\n", __func__, ret); - goto err_spi_get_resources; - } - - ret = request_irq(board_dat->pdev->irq, pch_spi_handler, - IRQF_SHARED, KBUILD_MODNAME, data); - if (ret) { - dev_err(&plat_dev->dev, - "%s request_irq failed\n", __func__); - goto err_request_irq; - } - data->irq_reg_sts = true; - - pch_spi_set_master_mode(master); - - ret = spi_register_master(master); - if (ret != 0) { - dev_err(&plat_dev->dev, - "%s spi_register_master FAILED\n", __func__); - goto err_spi_register_master; - } - - if (use_dma) { - dev_info(&plat_dev->dev, "Use DMA for data transfers\n"); - pch_alloc_dma_buf(board_dat, data); - } - - return 0; - -err_spi_register_master: - free_irq(board_dat->pdev->irq, board_dat); -err_request_irq: - pch_spi_free_resources(board_dat, data); -err_spi_get_resources: - pci_iounmap(board_dat->pdev, data->io_remap_addr); -err_pci_iomap: - spi_master_put(master); - - return ret; -} - -static int __devexit pch_spi_pd_remove(struct platform_device *plat_dev) -{ - struct pch_spi_board_data *board_dat = dev_get_platdata(&plat_dev->dev); - struct pch_spi_data *data = platform_get_drvdata(plat_dev); - int count; - unsigned long flags; - - dev_dbg(&plat_dev->dev, "%s:[ch%d] irq=%d\n", - __func__, plat_dev->id, board_dat->pdev->irq); - - if (use_dma) - pch_free_dma_buf(board_dat, data); - - /* check for any pending messages; no action is taken if the queue - * is still full; but at least we tried. Unload anyway */ - count = 500; - spin_lock_irqsave(&data->lock, flags); - data->status = STATUS_EXITING; - while ((list_empty(&data->queue) == 0) && --count) { - dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", - __func__); - spin_unlock_irqrestore(&data->lock, flags); - msleep(PCH_SLEEP_TIME); - spin_lock_irqsave(&data->lock, flags); - } - spin_unlock_irqrestore(&data->lock, flags); - - pch_spi_free_resources(board_dat, data); - /* disable interrupts & free IRQ */ - if (data->irq_reg_sts) { - /* disable interrupts */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); - data->irq_reg_sts = false; - free_irq(board_dat->pdev->irq, data); - } - - pci_iounmap(board_dat->pdev, data->io_remap_addr); - spi_unregister_master(data->master); - spi_master_put(data->master); - platform_set_drvdata(plat_dev, NULL); - - return 0; -} -#ifdef CONFIG_PM -static int pch_spi_pd_suspend(struct platform_device *pd_dev, - pm_message_t state) -{ - u8 count; - struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); - struct pch_spi_data *data = platform_get_drvdata(pd_dev); - - dev_dbg(&pd_dev->dev, "%s ENTRY\n", __func__); - - if (!board_dat) { - dev_err(&pd_dev->dev, - "%s pci_get_drvdata returned NULL\n", __func__); - return -EFAULT; - } - - /* check if the current message is processed: - Only after thats done the transfer will be suspended */ - count = 255; - while ((--count) > 0) { - if (!(data->bcurrent_msg_processing)) - break; - msleep(PCH_SLEEP_TIME); - } - - /* Free IRQ */ - if (data->irq_reg_sts) { - /* disable all interrupts */ - pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); - pch_spi_reset(data->master); - free_irq(board_dat->pdev->irq, data); - - data->irq_reg_sts = false; - dev_dbg(&pd_dev->dev, - "%s free_irq invoked successfully.\n", __func__); - } - - return 0; -} - -static int pch_spi_pd_resume(struct platform_device *pd_dev) -{ - struct pch_spi_board_data *board_dat = dev_get_platdata(&pd_dev->dev); - struct pch_spi_data *data = platform_get_drvdata(pd_dev); - int retval; - - if (!board_dat) { - dev_err(&pd_dev->dev, - "%s pci_get_drvdata returned NULL\n", __func__); - return -EFAULT; - } - - if (!data->irq_reg_sts) { - /* register IRQ */ - retval = request_irq(board_dat->pdev->irq, pch_spi_handler, - IRQF_SHARED, KBUILD_MODNAME, data); - if (retval < 0) { - dev_err(&pd_dev->dev, - "%s request_irq failed\n", __func__); - return retval; - } - - /* reset PCH SPI h/w */ - pch_spi_reset(data->master); - pch_spi_set_master_mode(data->master); - data->irq_reg_sts = true; - } - return 0; -} -#else -#define pch_spi_pd_suspend NULL -#define pch_spi_pd_resume NULL -#endif - -static struct platform_driver pch_spi_pd_driver = { - .driver = { - .name = "pch-spi", - .owner = THIS_MODULE, - }, - .probe = pch_spi_pd_probe, - .remove = __devexit_p(pch_spi_pd_remove), - .suspend = pch_spi_pd_suspend, - .resume = pch_spi_pd_resume -}; - -static int __devinit pch_spi_probe(struct pci_dev *pdev, - const struct pci_device_id *id) -{ - struct pch_spi_board_data *board_dat; - struct platform_device *pd_dev = NULL; - int retval; - int i; - struct pch_pd_dev_save *pd_dev_save; - - pd_dev_save = kzalloc(sizeof(struct pch_pd_dev_save), GFP_KERNEL); - if (!pd_dev_save) { - dev_err(&pdev->dev, "%s Can't allocate pd_dev_sav\n", __func__); - return -ENOMEM; - } - - board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL); - if (!board_dat) { - dev_err(&pdev->dev, "%s Can't allocate board_dat\n", __func__); - retval = -ENOMEM; - goto err_no_mem; - } - - retval = pci_request_regions(pdev, KBUILD_MODNAME); - if (retval) { - dev_err(&pdev->dev, "%s request_region failed\n", __func__); - goto pci_request_regions; - } - - board_dat->pdev = pdev; - board_dat->num = id->driver_data; - pd_dev_save->num = id->driver_data; - pd_dev_save->board_dat = board_dat; - - retval = pci_enable_device(pdev); - if (retval) { - dev_err(&pdev->dev, "%s pci_enable_device failed\n", __func__); - goto pci_enable_device; - } - - for (i = 0; i < board_dat->num; i++) { - pd_dev = platform_device_alloc("pch-spi", i); - if (!pd_dev) { - dev_err(&pdev->dev, "platform_device_alloc failed\n"); - goto err_platform_device; - } - pd_dev_save->pd_save[i] = pd_dev; - pd_dev->dev.parent = &pdev->dev; - - retval = platform_device_add_data(pd_dev, board_dat, - sizeof(*board_dat)); - if (retval) { - dev_err(&pdev->dev, - "platform_device_add_data failed\n"); - platform_device_put(pd_dev); - goto err_platform_device; - } - - retval = platform_device_add(pd_dev); - if (retval) { - dev_err(&pdev->dev, "platform_device_add failed\n"); - platform_device_put(pd_dev); - goto err_platform_device; - } - } - - pci_set_drvdata(pdev, pd_dev_save); - - return 0; - -err_platform_device: - pci_disable_device(pdev); -pci_enable_device: - pci_release_regions(pdev); -pci_request_regions: - kfree(board_dat); -err_no_mem: - kfree(pd_dev_save); - - return retval; -} - -static void __devexit pch_spi_remove(struct pci_dev *pdev) -{ - int i; - struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); - - dev_dbg(&pdev->dev, "%s ENTRY:pdev=%p\n", __func__, pdev); - - for (i = 0; i < pd_dev_save->num; i++) - platform_device_unregister(pd_dev_save->pd_save[i]); - - pci_disable_device(pdev); - pci_release_regions(pdev); - kfree(pd_dev_save->board_dat); - kfree(pd_dev_save); -} - -#ifdef CONFIG_PM -static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state) -{ - int retval; - struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); - - dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); - - pd_dev_save->board_dat->suspend_sts = true; - - /* save config space */ - retval = pci_save_state(pdev); - if (retval == 0) { - pci_enable_wake(pdev, PCI_D3hot, 0); - pci_disable_device(pdev); - pci_set_power_state(pdev, PCI_D3hot); - } else { - dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__); - } - - return retval; -} - -static int pch_spi_resume(struct pci_dev *pdev) -{ - int retval; - struct pch_pd_dev_save *pd_dev_save = pci_get_drvdata(pdev); - dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); - - pci_set_power_state(pdev, PCI_D0); - pci_restore_state(pdev); - - retval = pci_enable_device(pdev); - if (retval < 0) { - dev_err(&pdev->dev, - "%s pci_enable_device failed\n", __func__); - } else { - pci_enable_wake(pdev, PCI_D3hot, 0); - - /* set suspend status to false */ - pd_dev_save->board_dat->suspend_sts = false; - } - - return retval; -} -#else -#define pch_spi_suspend NULL -#define pch_spi_resume NULL - -#endif - -static struct pci_driver pch_spi_pcidev_driver = { - .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) -{ - int ret; - ret = platform_driver_register(&pch_spi_pd_driver); - if (ret) - return ret; - - ret = pci_register_driver(&pch_spi_pcidev_driver); - if (ret) - return ret; - - return 0; -} -module_init(pch_spi_init); - -static void __exit pch_spi_exit(void) -{ - pci_unregister_driver(&pch_spi_pcidev_driver); - platform_driver_unregister(&pch_spi_pd_driver); -} -module_exit(pch_spi_exit); - -module_param(use_dma, int, 0644); -MODULE_PARM_DESC(use_dma, - "to use DMA for data transfers pass 1 else 0; default 1"); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semiconductor ML7xxx IOH SPI Driver"); |