[PATCH] spi/topcliff: cleanups for style and conciseness

From: Grant Likely
Date: Fri Oct 08 2010 - 14:51:32 EST

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@xxxxxxxxxxxx>
---

Hi Ohtake,

Here are the cleanups that I've applied to the topcliff spi driver. I
figured this was easier than rejecting your patch again and asking
your for more specific changes. Please try it out and make sure I
haven't broken anything.

Cheers,
g.

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 58b183f..9774623 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(&reg_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(&reg_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");

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