diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2010-09-29 17:31:34 +0900 |
---|---|---|
committer | Grant Likely <grant.likely@secretlab.ca> | 2010-10-12 21:37:37 -0600 |
commit | 65308c46b760bb2ccb043b47bb5f053dbb8d11b5 (patch) | |
tree | b1207bb74c3c8e04ac0dbe856b0b449011d7d19a /drivers/spi | |
parent | e8b17b5b3f30252b5470dbbf54bc251ddc7fac17 (diff) |
spi/topcliff: cleanups for style and conciseness
This patch makes multiple cleanups to the new topcliff pch spi driver
including, but not limited to,
- removing superfluous brackets around variables
- open coding functions that are only used once
- removing unnecessary line breaks
- removing unused functions
- simplifying the interrupt enable/disable code
- remove unnecessary (void *) casts.
- remove b_mem_fail from pch_spi_set_tx to code it more cleanly
- shorten dev_dbg() messages for conciseness and readability
More cleanups are still needed in this driver. In particular,
- the driver filename should be changed to spi_topcliff_pch.c
- many of the dev_dbg() lines should be trimmed (particularly the ones
on unconditional code paths).
- I suspect that the locking model not correct. I'd like to know what
drivers' critical regions are, and how they are protected.
- get_resources and release_resources probably should be open coded in
.probe and .release respectively.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/spi_topcliff_pch.c | 502 |
1 files changed, 138 insertions, 364 deletions
diff --git a/drivers/spi/spi_topcliff_pch.c b/drivers/spi/spi_topcliff_pch.c index 58b183f6eec..97746232741 100644 --- a/drivers/spi/spi_topcliff_pch.c +++ b/drivers/spi/spi_topcliff_pch.c @@ -1,8 +1,6 @@ /* * 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 @@ -19,6 +17,7 @@ * 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> @@ -45,17 +44,7 @@ #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 @@ -86,6 +75,8 @@ #define SPSR_FI_BIT (1 << 2) #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 @@ -176,16 +167,6 @@ static struct pci_device_id pch_spi_pcidev_id[] = { {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. @@ -194,9 +175,7 @@ static inline void pch_clr_bitmsk(u32 *var, u32 bitmask) */ 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)); } @@ -208,19 +187,9 @@ static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val) 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) { @@ -229,7 +198,6 @@ static inline void pch_spi_setclr_reg(struct spi_master *master, int idx, 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); @@ -245,35 +213,6 @@ static void pch_spi_clear_fifo(struct spi_master *master) 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) { @@ -309,9 +248,7 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, /* 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); + reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ /* reset rx threshold */ reg_spcr_val &= MASK_RFIC_SPCR_BITS; @@ -329,7 +266,8 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, /* 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); + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, + SPCR_FIE_BIT | SPCR_TFIE_BIT); /* transfer is completed;inform pch_spi_process_messages */ data->transfer_complete = true; @@ -337,7 +275,6 @@ static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, } } - /** * pch_spi_handler() - Interrupt handler * @irq: The interrupt number. @@ -350,7 +287,6 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id) 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) { @@ -366,7 +302,6 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id) 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; @@ -385,12 +320,9 @@ static irqreturn_t pch_spi_handler(int irq, void *dev_id) */ 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); + 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; @@ -417,106 +349,30 @@ static void pch_spi_set_bits_per_word(struct spi_master *master, */ static void pch_spi_setup_transfer(struct spi_device *spi) { - u32 reg_spcr_val; + 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) - 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_LSB_FIRST)) + flags |= SPCR_LSBF_BIT; 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); - + flags |= 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); + 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_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. */ @@ -532,13 +388,12 @@ static void pch_spi_reset(struct spi_master *master) static int pch_spi_setup(struct spi_device *pspi) { /* check bits per word */ - if ((pspi->bits_per_word) == 0) { + 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))) { + if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) { dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__); return -EINVAL; } @@ -550,7 +405,7 @@ static int pch_spi_setup(struct spi_device *pspi) pspi->max_speed_hz = PCH_MAX_BAUDRATE; dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__, - ((pspi->mode) & (SPI_CPOL | SPI_CPHA))); + (pspi->mode) & (SPI_CPOL | SPI_CPHA)); return 0; } @@ -564,17 +419,15 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) 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__); + 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; } @@ -582,32 +435,28 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) 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))) { + 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; + goto err_out; } - if (!(transfer->len)) { + if (!transfer->len) { dev_err(&pspi->dev, "%s Transfer length invalid\n", __func__); retval = -EINVAL; - goto err_return_spinlock; + goto err_out; } 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 (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) { @@ -616,14 +465,15 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) retval = -EINVAL; dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__); - goto err_return_spinlock; + goto err_out; } } } - /* We won't process any messages if we have been asked to terminate */ + spin_lock_irqsave(&data->lock, flags); - if (STATUS_EXITING == (data->status)) { + /* 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_return_spinlock; @@ -631,27 +481,23 @@ static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) /* If suspended ,return -EINVAL */ if (data->board_dat->suspend_sts) { - dev_err(&pspi->dev, - "%s bSuspending= true returning EINVAL\n", __func__); + dev_err(&pspi->dev, "%s suspend; 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; @@ -666,10 +512,9 @@ err_out: 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__); + 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; } } @@ -683,9 +528,8 @@ static inline void pch_spi_select_chip(struct pch_spi_data *data, } static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, - struct spi_message **ppmsg) + struct spi_message **ppmsg) { - int b_mem_fail; int size; u32 n_writes; int j; @@ -697,20 +541,16 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, /* 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)); + 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:setting bits per word\n", __func__); + 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)); + data->cur_trans->bits_per_word); *bpw = data->cur_trans->bits_per_word; } else { *bpw = data->current_msg->spi->bits_per_word; @@ -721,28 +561,21 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, 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))); + 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; + if (!data->pkt_rx_buff) kfree(data->pkt_tx_buff); - } - } else { - b_mem_fail = true; } - if (b_mem_fail) { + if (!data->pkt_rx_buff) { /* flush queue and set status of all transfers to -ENOMEM */ - dev_err(&data->master->dev, - "Kzalloc fail in %s messages\n", __func__); + dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__); list_for_each_entry(pmsg, data->queue.next, queue) { pmsg->status = -ENOMEM; @@ -752,39 +585,33 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, /* delete from queue */ list_del_init(&pmsg->queue); } - return; } /* copy Tx Data */ - if ((data->cur_trans->tx_buf) != NULL) { + 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]; - } + tx_buf = data->cur_trans->tx_buf; + for (j = 0; j < data->bpw_len; j++) + data->pkt_tx_buff[j] = *tx_buf++; } else { - for (j = 0; j < (data->bpw_len); j++) { - tx_sbuf = data->cur_trans->tx_buf; - data->pkt_tx_buff[j] = tx_sbuf[j]; - } + 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 */ - if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) + n_writes = data->bpw_len; + if (n_writes > 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 " + 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]); - } + 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; @@ -798,13 +625,12 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, 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__); + dev_dbg(&data->master->dev, "%s called\n", __func__); /* Invoke complete callback - [To the spi core..indicating end of transfer] */ + * [To the spi core..indicating end of transfer] */ data->current_msg->status = 0; - if ((data->current_msg->complete) != 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); @@ -819,28 +645,26 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data, data->current_msg = NULL; data->cur_trans = NULL; - /* check if we have items in list and not suspending */ - /* return 1 if list empty */ + /* 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)) { + (!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__); + * 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)) { + } 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) + if (pmsg->complete) pmsg->complete(pmsg->context); /* delete from queue */ @@ -851,30 +675,29 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data, 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); + pch_spi_setclr_reg(data->master, PCH_SPCR, + PCH_RX_THOLD << SPCR_TFIC_FIELD, + ~MASK_TFIC_SPCR_BITS); /* enable FI and RFI interrupts */ - pch_spi_enable_interrupts(data->master, PCH_RFI | PCH_FI); + pch_spi_setclr_reg(data->master, PCH_SPCR, + SPCR_RFIE_BIT | SPCR_TFIE_BIT, 0); } else { /* set receive threhold to maximum */ - pch_spi_set_threshold(data->current_chip, PCH_RX_THOLD_MAX, - PCH_RX); + pch_spi_setclr_reg(data->master, PCH_SPCR, + PCH_RX_THOLD_MAX << SPCR_TFIC_FIELD, + ~MASK_TFIC_SPCR_BITS); /* enable FI interrupt */ - pch_spi_enable_interrupts(data->master, PCH_FI); + pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_FIE_BIT, 0); } 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); - + pch_spi_setclr_reg(data->current_chip->master, PCH_SPCR, SPCR_SPE_BIT, 0); /* Wait until the transfer completes; go to sleep after initiating the transfer. */ @@ -893,9 +716,9 @@ static void pch_spi_set_ir(struct pch_spi_data *data) /* clear all interrupts */ pch_spi_writereg(data->master, PCH_SPSR, - (pch_spi_readreg(data->master, PCH_SPSR))); + pch_spi_readreg(data->master, PCH_SPSR)); /* disable interrupts */ - pch_spi_disable_interrupts(data->master, PCH_ALL); + pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); } static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) @@ -905,19 +728,17 @@ static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) u16 *rx_sbuf; /* copy Rx Data */ - if (!(data->cur_trans->rx_buf)) + 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; - } + rx_buf = data->cur_trans->rx_buf; + for (j = 0; j < data->bpw_len; j++) + *rx_buf++ = 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]; - } + rx_sbuf = data->cur_trans->rx_buf; + for (j = 0; j < data->bpw_len; j++) + *rx_sbuf++ = data->pkt_rx_buff[j]; } } @@ -925,20 +746,20 @@ static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) static void pch_spi_process_messages(struct work_struct *pwork) { struct spi_message *pmsg; + struct pch_spi_data *data; 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__); + data = container_of(pwork, struct pch_spi_data, work); spin_lock(&data->lock); /* check if suspend has been initiated;if yes flush queue */ - if ((data->board_dat->suspend_sts) || - (data->status == STATUS_EXITING)) { + 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; @@ -961,8 +782,8 @@ static void pch_spi_process_messages(struct work_struct *pwork) "%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); + data->current_msg = list_entry(data->queue.next, struct spi_message, + queue); list_del_init(&data->current_msg->queue); @@ -1044,7 +865,7 @@ static void pch_spi_process_messages(struct work_struct *pwork) spin_unlock(&data->lock); - } while ((data->cur_trans) != NULL); + } while (data->cur_trans != NULL); } static void pch_spi_free_resources(struct pch_spi_board_data *board_dat) @@ -1063,14 +884,11 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat) /* 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__); + pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0, + PCH_ALL); /* free IRQ */ - free_irq(board_dat->pdev->irq, (void *)board_dat); + free_irq(board_dat->pdev->irq, board_dat); dev_dbg(&board_dat->pdev->dev, "%s free_irq invoked successfully\n", __func__); @@ -1079,7 +897,7 @@ static void pch_spi_free_resources(struct pch_spi_board_data *board_dat) } /* unmap PCI base address */ - if ((board_dat->data->io_remap_addr) != 0) { + 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; @@ -1104,26 +922,9 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat) 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) { + if (!board_dat->data->wk) { dev_err(&board_dat->pdev->dev, "%s create_singlet hread_workqueue failed\n", __func__); retval = -EBUSY; @@ -1143,7 +944,6 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat) 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__); @@ -1161,7 +961,7 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat) /* register IRQ */ retval = request_irq(board_dat->pdev->irq, pch_spi_handler, - IRQF_SHARED, KBUILD_MODNAME, (void *)board_dat); + IRQF_SHARED, KBUILD_MODNAME, board_dat); if (retval != 0) { dev_err(&board_dat->pdev->dev, "%s request_irq failed\n", __func__); @@ -1172,8 +972,7 @@ static int pch_spi_get_resources(struct pch_spi_board_data *board_dat) __func__, retval); board_dat->irq_reg_sts = true; - dev_dbg(&board_dat->pdev->dev, - "%s data->irq_reg_sts=true\n", __func__); + dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); err_return: if (retval != 0) { @@ -1187,38 +986,6 @@ err_return: 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) { @@ -1279,12 +1046,17 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id) board_dat->data->master = master; board_dat->data->n_curnt_chip = 255; board_dat->data->board_dat = board_dat; + board_dat->data->status = STATUS_RUNNING; + + INIT_LIST_HEAD(&board_dat->data->queue); + spin_lock_init(&board_dat->data->lock); + INIT_WORK(&board_dat->data->work, pch_spi_process_messages); + init_waitqueue_head(&board_dat->data->wait); /* 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); + if (retval) { + dev_err(&pdev->dev, "%s fail(retval=%d)\n", __func__, retval); goto err_spi_get_resources; } @@ -1292,7 +1064,7 @@ static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id) __func__, retval); /* save private data in dev */ - pci_set_drvdata(pdev, (void *)board_dat); + pci_set_drvdata(pdev, board_dat); dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__); /* set master mode */ @@ -1329,6 +1101,7 @@ err_kmalloc: static void pch_spi_remove(struct pci_dev *pdev) { struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev); + int count; dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); @@ -1338,19 +1111,23 @@ static void pch_spi_remove(struct pci_dev *pdev) 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 */ + /* 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(&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); /* 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 */ @@ -1401,13 +1178,11 @@ static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state) /* Free IRQ */ if (board_dat->irq_reg_sts) { /* disable all interrupts */ - pch_spi_disable_interrupts(board_dat->data->master, PCH_ALL); + pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0, + 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); + free_irq(board_dat->pdev->irq, board_dat); board_dat->irq_reg_sts = false; dev_dbg(&pdev->dev, @@ -1471,7 +1246,7 @@ static int pch_spi_resume(struct pci_dev *pdev) pci_enable_wake(pdev, PCI_D3hot, 0); /* register IRQ handler */ - if (!(board->irq_reg_sts)) { + if (!board->irq_reg_sts) { /* register IRQ */ retval = request_irq(board->pdev->irq, pch_spi_handler, IRQF_SHARED, KBUILD_MODNAME, @@ -1518,7 +1293,6 @@ static int __init pch_spi_init(void) } module_init(pch_spi_init); - static void __exit pch_spi_exit(void) { pci_unregister_driver(&pch_spi_pcidev); @@ -1526,4 +1300,4 @@ static void __exit pch_spi_exit(void) module_exit(pch_spi_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("PCH SPI PCI Driver"); +MODULE_DESCRIPTION("Topcliff PCH SPI PCI Driver"); |