spi: Refactor spi-orion to use SPI framework queue.
Replace the deprecated master->transfer with transfer_one_message() and allow the SPI subsystem handle all the queuing of messages. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@googlemail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Andrew Lunn
Mark Brown
parent
d9875690d9
commit
ba59a80788
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@ -36,12 +36,6 @@
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#define ORION_SPI_CLK_PRESCALE_MASK 0x1F
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struct orion_spi {
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struct work_struct work;
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/* Lock access to transfer list. */
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spinlock_t lock;
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struct list_head msg_queue;
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struct spi_master *master;
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void __iomem *base;
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unsigned int max_speed;
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@ -49,8 +43,6 @@ struct orion_spi {
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struct clk *clk;
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};
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static struct workqueue_struct *orion_spi_wq;
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static inline void __iomem *spi_reg(struct orion_spi *orion_spi, u32 reg)
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{
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return orion_spi->base + reg;
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@ -277,73 +269,78 @@ out:
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}
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static void orion_spi_work(struct work_struct *work)
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static int orion_spi_transfer_one_message(struct spi_master *master,
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struct spi_message *m)
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{
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struct orion_spi *orion_spi =
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container_of(work, struct orion_spi, work);
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struct orion_spi *orion_spi = spi_master_get_devdata(master);
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struct spi_device *spi = m->spi;
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struct spi_transfer *t = NULL;
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int par_override = 0;
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int status = 0;
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int cs_active = 0;
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spin_lock_irq(&orion_spi->lock);
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while (!list_empty(&orion_spi->msg_queue)) {
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struct spi_message *m;
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struct spi_device *spi;
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struct spi_transfer *t = NULL;
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int par_override = 0;
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int status = 0;
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int cs_active = 0;
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/* Load defaults */
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status = orion_spi_setup_transfer(spi, NULL);
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m = container_of(orion_spi->msg_queue.next, struct spi_message,
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queue);
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if (status < 0)
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goto msg_done;
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list_del_init(&m->queue);
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spin_unlock_irq(&orion_spi->lock);
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spi = m->spi;
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/* Load defaults */
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status = orion_spi_setup_transfer(spi, NULL);
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if (status < 0)
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list_for_each_entry(t, &m->transfers, transfer_list) {
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/* make sure buffer length is even when working in 16
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* bit mode*/
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if ((t->bits_per_word == 16) && (t->len & 1)) {
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dev_err(&spi->dev,
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"message rejected : "
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"odd data length %d while in 16 bit mode\n",
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t->len);
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status = -EIO;
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goto msg_done;
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (par_override || t->speed_hz || t->bits_per_word) {
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par_override = 1;
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status = orion_spi_setup_transfer(spi, t);
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if (status < 0)
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break;
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if (!t->speed_hz && !t->bits_per_word)
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par_override = 0;
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}
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if (!cs_active) {
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orion_spi_set_cs(orion_spi, 1);
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cs_active = 1;
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}
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if (t->len)
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m->actual_length +=
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orion_spi_write_read(spi, t);
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if (t->delay_usecs)
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udelay(t->delay_usecs);
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if (t->cs_change) {
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orion_spi_set_cs(orion_spi, 0);
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cs_active = 0;
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}
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}
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msg_done:
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if (cs_active)
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if (t->speed_hz && t->speed_hz < orion_spi->min_speed) {
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dev_err(&spi->dev,
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"message rejected : "
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"device min speed (%d Hz) exceeds "
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"required transfer speed (%d Hz)\n",
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orion_spi->min_speed, t->speed_hz);
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status = -EIO;
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goto msg_done;
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}
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if (par_override || t->speed_hz || t->bits_per_word) {
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par_override = 1;
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status = orion_spi_setup_transfer(spi, t);
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if (status < 0)
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break;
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if (!t->speed_hz && !t->bits_per_word)
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par_override = 0;
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}
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if (!cs_active) {
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orion_spi_set_cs(orion_spi, 1);
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cs_active = 1;
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}
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if (t->len)
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m->actual_length += orion_spi_write_read(spi, t);
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if (t->delay_usecs)
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udelay(t->delay_usecs);
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if (t->cs_change) {
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orion_spi_set_cs(orion_spi, 0);
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m->status = status;
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m->complete(m->context);
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spin_lock_irq(&orion_spi->lock);
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cs_active = 0;
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}
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}
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spin_unlock_irq(&orion_spi->lock);
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msg_done:
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if (cs_active)
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orion_spi_set_cs(orion_spi, 0);
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m->status = status;
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spi_finalize_current_message(master);
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return 0;
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}
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static int __init orion_spi_reset(struct orion_spi *orion_spi)
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@ -376,75 +373,6 @@ static int orion_spi_setup(struct spi_device *spi)
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return 0;
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}
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static int orion_spi_transfer(struct spi_device *spi, struct spi_message *m)
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{
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struct orion_spi *orion_spi;
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struct spi_transfer *t = NULL;
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unsigned long flags;
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m->actual_length = 0;
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m->status = 0;
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/* reject invalid messages and transfers */
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if (list_empty(&m->transfers) || !m->complete)
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return -EINVAL;
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orion_spi = spi_master_get_devdata(spi->master);
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list_for_each_entry(t, &m->transfers, transfer_list) {
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unsigned int bits_per_word = spi->bits_per_word;
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if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
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dev_err(&spi->dev,
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"message rejected : "
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"invalid transfer data buffers\n");
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goto msg_rejected;
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}
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if (t->bits_per_word)
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bits_per_word = t->bits_per_word;
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if ((bits_per_word != 8) && (bits_per_word != 16)) {
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dev_err(&spi->dev,
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"message rejected : "
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"invalid transfer bits_per_word (%d bits)\n",
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bits_per_word);
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goto msg_rejected;
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}
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/*make sure buffer length is even when working in 16 bit mode*/
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if ((t->bits_per_word == 16) && (t->len & 1)) {
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dev_err(&spi->dev,
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"message rejected : "
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"odd data length (%d) while in 16 bit mode\n",
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t->len);
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goto msg_rejected;
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}
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if (t->speed_hz && t->speed_hz < orion_spi->min_speed) {
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dev_err(&spi->dev,
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"message rejected : "
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"device min speed (%d Hz) exceeds "
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"required transfer speed (%d Hz)\n",
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orion_spi->min_speed, t->speed_hz);
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goto msg_rejected;
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}
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}
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spin_lock_irqsave(&orion_spi->lock, flags);
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list_add_tail(&m->queue, &orion_spi->msg_queue);
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queue_work(orion_spi_wq, &orion_spi->work);
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spin_unlock_irqrestore(&orion_spi->lock, flags);
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return 0;
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msg_rejected:
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/* Message rejected and not queued */
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m->status = -EINVAL;
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if (m->complete)
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m->complete(m->context);
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return -EINVAL;
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}
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static int __init orion_spi_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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@ -474,7 +402,7 @@ static int __init orion_spi_probe(struct platform_device *pdev)
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master->mode_bits = 0;
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master->setup = orion_spi_setup;
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master->transfer = orion_spi_transfer;
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master->transfer_one_message = orion_spi_transfer_one_message;
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master->num_chipselect = ORION_NUM_CHIPSELECTS;
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dev_set_drvdata(&pdev->dev, master);
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@ -507,11 +435,6 @@ static int __init orion_spi_probe(struct platform_device *pdev)
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}
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spi->base = ioremap(r->start, SZ_1K);
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INIT_WORK(&spi->work, orion_spi_work);
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spin_lock_init(&spi->lock);
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INIT_LIST_HEAD(&spi->msg_queue);
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if (orion_spi_reset(spi) < 0)
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goto out_rel_mem;
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@ -536,14 +459,12 @@ out:
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static int __exit orion_spi_remove(struct platform_device *pdev)
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{
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struct spi_master *master;
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struct orion_spi *spi;
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struct resource *r;
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struct orion_spi *spi;
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master = dev_get_drvdata(&pdev->dev);
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spi = spi_master_get_devdata(master);
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cancel_work_sync(&spi->work);
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clk_disable_unprepare(spi->clk);
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clk_put(spi->clk);
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@ -574,21 +495,13 @@ static struct platform_driver orion_spi_driver = {
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static int __init orion_spi_init(void)
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{
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orion_spi_wq = create_singlethread_workqueue(
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orion_spi_driver.driver.name);
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if (orion_spi_wq == NULL)
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return -ENOMEM;
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return platform_driver_probe(&orion_spi_driver, orion_spi_probe);
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}
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module_init(orion_spi_init);
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static void __exit orion_spi_exit(void)
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{
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flush_workqueue(orion_spi_wq);
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platform_driver_unregister(&orion_spi_driver);
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destroy_workqueue(orion_spi_wq);
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}
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module_exit(orion_spi_exit);
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