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Merge branch 'pl022' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-stericsson into gpio/next

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This commit is contained in:
Grant Likely 2011-12-13 15:56:34 -07:00
commit 15182f6364
2 changed files with 89 additions and 56 deletions
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125
drivers/spi/spi-pl022.c
View File

@ -340,6 +340,10 @@ struct vendor_data {
* @cur_msg: Pointer to current spi_message being processed
* @cur_transfer: Pointer to current spi_transfer
* @cur_chip: pointer to current clients chip(assigned from controller_state)
* @next_msg_cs_active: the next message in the queue has been examined
* and it was found that it uses the same chip select as the previous
* message, so we left it active after the previous transfer, and it's
* active already.
* @tx: current position in TX buffer to be read
* @tx_end: end position in TX buffer to be read
* @rx: current position in RX buffer to be written
@ -373,6 +377,7 @@ struct pl022 {
struct spi_message *cur_msg;
struct spi_transfer *cur_transfer;
struct chip_data *cur_chip;
bool next_msg_cs_active;
void *tx;
void *tx_end;
void *rx;
@ -445,23 +450,9 @@ static void giveback(struct pl022 *pl022)
struct spi_transfer *last_transfer;
unsigned long flags;
struct spi_message *msg;
void (*curr_cs_control) (u32 command);
pl022->next_msg_cs_active = false;
/*
* This local reference to the chip select function
* is needed because we set curr_chip to NULL
* as a step toward termininating the message.
*/
curr_cs_control = pl022->cur_chip->cs_control;
spin_lock_irqsave(&pl022->queue_lock, flags);
msg = pl022->cur_msg;
pl022->cur_msg = NULL;
pl022->cur_transfer = NULL;
pl022->cur_chip = NULL;
queue_work(pl022->workqueue, &pl022->pump_messages);
spin_unlock_irqrestore(&pl022->queue_lock, flags);
last_transfer = list_entry(msg->transfers.prev,
last_transfer = list_entry(pl022->cur_msg->transfers.prev,
struct spi_transfer,
transfer_list);
@ -473,18 +464,13 @@ static void giveback(struct pl022 *pl022)
*/
udelay(last_transfer->delay_usecs);
/*
* Drop chip select UNLESS cs_change is true or we are returning
* a message with an error, or next message is for another chip
*/
if (!last_transfer->cs_change)
curr_cs_control(SSP_CHIP_DESELECT);
else {
if (!last_transfer->cs_change) {
struct spi_message *next_msg;
/* Holding of cs was hinted, but we need to make sure
* the next message is for the same chip. Don't waste
* time with the following tests unless this was hinted.
/*
* cs_change was not set. We can keep the chip select
* enabled if there is message in the queue and it is
* for the same spi device.
*
* We cannot postpone this until pump_messages, because
* after calling msg->complete (below) the driver that
@ -501,19 +487,29 @@ static void giveback(struct pl022 *pl022)
struct spi_message, queue);
spin_unlock_irqrestore(&pl022->queue_lock, flags);
/* see if the next and current messages point
* to the same chip
/*
* see if the next and current messages point
* to the same spi device.
*/
if (next_msg && next_msg->spi != msg->spi)
if (next_msg && next_msg->spi != pl022->cur_msg->spi)
next_msg = NULL;
if (!next_msg || msg->state == STATE_ERROR)
curr_cs_control(SSP_CHIP_DESELECT);
if (!next_msg || pl022->cur_msg->state == STATE_ERROR)
pl022->cur_chip->cs_control(SSP_CHIP_DESELECT);
else
pl022->next_msg_cs_active = true;
}
spin_lock_irqsave(&pl022->queue_lock, flags);
msg = pl022->cur_msg;
pl022->cur_msg = NULL;
pl022->cur_transfer = NULL;
pl022->cur_chip = NULL;
queue_work(pl022->workqueue, &pl022->pump_messages);
spin_unlock_irqrestore(&pl022->queue_lock, flags);
msg->state = NULL;
if (msg->complete)
msg->complete(msg->context);
/* This message is completed, so let's turn off the clocks & power */
pm_runtime_put(&pl022->adev->dev);
}
/**
@ -1244,9 +1240,9 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
if ((pl022->tx == pl022->tx_end) && (flag == 0)) {
flag = 1;
/* Disable Transmit interrupt */
writew(readw(SSP_IMSC(pl022->virtbase)) &
(~SSP_IMSC_MASK_TXIM),
/* Disable Transmit interrupt, enable receive interrupt */
writew((readw(SSP_IMSC(pl022->virtbase)) &
~SSP_IMSC_MASK_TXIM) | SSP_IMSC_MASK_RXIM,
SSP_IMSC(pl022->virtbase));
}
@ -1352,7 +1348,7 @@ static void pump_transfers(unsigned long data)
*/
udelay(previous->delay_usecs);
/* Drop chip select only if cs_change is requested */
/* Reselect chip select only if cs_change was requested */
if (previous->cs_change)
pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
} else {
@ -1379,15 +1375,22 @@ static void pump_transfers(unsigned long data)
}
err_config_dma:
writew(ENABLE_ALL_INTERRUPTS, SSP_IMSC(pl022->virtbase));
/* enable all interrupts except RX */
writew(ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM, SSP_IMSC(pl022->virtbase));
}
static void do_interrupt_dma_transfer(struct pl022 *pl022)
{
u32 irqflags = ENABLE_ALL_INTERRUPTS;
/*
* Default is to enable all interrupts except RX -
* this will be enabled once TX is complete
*/
u32 irqflags = ENABLE_ALL_INTERRUPTS & ~SSP_IMSC_MASK_RXIM;
/* Enable target chip */
/* Enable target chip, if not already active */
if (!pl022->next_msg_cs_active)
pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
if (set_up_next_transfer(pl022, pl022->cur_transfer)) {
/* Error path */
pl022->cur_msg->state = STATE_ERROR;
@ -1442,6 +1445,7 @@ static void do_polling_transfer(struct pl022 *pl022)
} else {
/* STATE_START */
message->state = STATE_RUNNING;
if (!pl022->next_msg_cs_active)
pl022->cur_chip->cs_control(SSP_CHIP_SELECT);
}
@ -1504,14 +1508,28 @@ static void pump_messages(struct work_struct *work)
struct pl022 *pl022 =
container_of(work, struct pl022, pump_messages);
unsigned long flags;
bool was_busy = false;
/* Lock queue and check for queue work */
spin_lock_irqsave(&pl022->queue_lock, flags);
if (list_empty(&pl022->queue) || !pl022->running) {
if (pl022->busy) {
/* nothing more to do - disable spi/ssp and power off */
writew((readw(SSP_CR1(pl022->virtbase)) &
(~SSP_CR1_MASK_SSE)), SSP_CR1(pl022->virtbase));
if (pl022->master_info->autosuspend_delay > 0) {
pm_runtime_mark_last_busy(&pl022->adev->dev);
pm_runtime_put_autosuspend(&pl022->adev->dev);
} else {
pm_runtime_put(&pl022->adev->dev);
}
}
pl022->busy = false;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
return;
}
/* Make sure we are not already running a message */
if (pl022->cur_msg) {
spin_unlock_irqrestore(&pl022->queue_lock, flags);
@ -1522,6 +1540,9 @@ static void pump_messages(struct work_struct *work)
list_entry(pl022->queue.next, struct spi_message, queue);
list_del_init(&pl022->cur_msg->queue);
if (pl022->busy)
was_busy = true;
else
pl022->busy = true;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
@ -1532,12 +1553,14 @@ static void pump_messages(struct work_struct *work)
/* Setup the SPI using the per chip configuration */
pl022->cur_chip = spi_get_ctldata(pl022->cur_msg->spi);
if (!was_busy)
/*
* We enable the core voltage and clocks here, then the clocks
* and core will be disabled when giveback() is called in each method
* (poll/interrupt/DMA)
* and core will be disabled when this workqueue is run again
* and there is no more work to be done.
*/
pm_runtime_get_sync(&pl022->adev->dev);
restore_state(pl022);
flush(pl022);
@ -1582,6 +1605,7 @@ static int start_queue(struct pl022 *pl022)
pl022->cur_msg = NULL;
pl022->cur_transfer = NULL;
pl022->cur_chip = NULL;
pl022->next_msg_cs_active = false;
spin_unlock_irqrestore(&pl022->queue_lock, flags);
queue_work(pl022->workqueue, &pl022->pump_messages);
@ -1881,7 +1905,7 @@ static int pl022_setup(struct spi_device *spi)
{
struct pl022_config_chip const *chip_info;
struct chip_data *chip;
struct ssp_clock_params clk_freq = {0, };
struct ssp_clock_params clk_freq = { .cpsdvsr = 0, .scr = 0};
int status = 0;
struct pl022 *pl022 = spi_master_get_devdata(spi->master);
unsigned int bits = spi->bits_per_word;
@ -2231,7 +2255,17 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
dev_dbg(dev, "probe succeeded\n");
/* let runtime pm put suspend */
if (platform_info->autosuspend_delay > 0) {
dev_info(&adev->dev,
"will use autosuspend for runtime pm, delay %dms\n",
platform_info->autosuspend_delay);
pm_runtime_set_autosuspend_delay(dev,
platform_info->autosuspend_delay);
pm_runtime_use_autosuspend(dev);
pm_runtime_put_autosuspend(dev);
} else {
pm_runtime_put(dev);
}
return 0;
err_spi_register:
@ -2305,11 +2339,6 @@ static int pl022_suspend(struct device *dev)
return status;
}
amba_vcore_enable(pl022->adev);
amba_pclk_enable(pl022->adev);
load_ssp_default_config(pl022);
amba_pclk_disable(pl022->adev);
amba_vcore_disable(pl022->adev);
dev_dbg(dev, "suspended\n");
return 0;
}

4
include/linux/amba/pl022.h
View File

@ -238,6 +238,9 @@ struct dma_chan;
* @enable_dma: if true enables DMA driven transfers.
* @dma_rx_param: parameter to locate an RX DMA channel.
* @dma_tx_param: parameter to locate a TX DMA channel.
* @autosuspend_delay: delay in ms following transfer completion before the
* runtime power management system suspends the device. A setting of 0
* indicates no delay and the device will be suspended immediately.
*/
struct pl022_ssp_controller {
u16 bus_id;
@ -246,6 +249,7 @@ struct pl022_ssp_controller {
bool (*dma_filter)(struct dma_chan *chan, void *filter_param);
void *dma_rx_param;
void *dma_tx_param;
int autosuspend_delay;
};
/**