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spi: bcm2835: Replace spi_master by spi_controller 

Commit 8caab75fd2 ('spi: Generalize SPI "master" to "controller"')
changed the "spi_master" nomenclature to "spi_controller", necessitating
a conversion of all drivers.

Perform this conversion for the BCM2835 SPI driver.
No functional change intended.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Frank Pavlic <f.pavlic@kunbus.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lukas Wunner 2019-05-13 16:48:39 +02:00 committed by Mark Brown
parent 97266c4d05
commit 5f336ea53b
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 96 additions and 95 deletions
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191
drivers/spi/spi-bcm2835.c
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@ -318,9 +318,9 @@ static inline void bcm2835_wr_fifo_blind(struct bcm2835_spi *bs, int count)
}
}
static void bcm2835_spi_reset_hw(struct spi_master *master)
static void bcm2835_spi_reset_hw(struct spi_controller *ctlr)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/* Disable SPI interrupts and transfer */
@ -339,8 +339,8 @@ static void bcm2835_spi_reset_hw(struct spi_master *master)
static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
{
struct spi_master *master = dev_id;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct spi_controller *ctlr = dev_id;
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/*
@ -362,20 +362,20 @@ static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
if (!bs->rx_len) {
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
/* wake up the framework */
complete(&master->xfer_completion);
complete(&ctlr->xfer_completion);
}
return IRQ_HANDLED;
}
static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
static int bcm2835_spi_transfer_one_irq(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs, bool fifo_empty)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
/* update usage statistics */
bs->count_transfer_irq++;
@ -401,7 +401,7 @@ static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
/**
* bcm2835_spi_transfer_prologue() - transfer first few bytes without DMA
* @master: SPI master
* @ctlr: SPI master controller
* @tfr: SPI transfer
* @bs: BCM2835 SPI controller
* @cs: CS register
@ -445,7 +445,7 @@ static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
* be transmitted in 32-bit width to ensure that the following DMA transfer can
* pick up the residue in the RX FIFO in ungarbled form.
*/
static void bcm2835_spi_transfer_prologue(struct spi_master *master,
static void bcm2835_spi_transfer_prologue(struct spi_controller *ctlr,
struct spi_transfer *tfr,
struct bcm2835_spi *bs,
u32 cs)
@ -486,9 +486,9 @@ static void bcm2835_spi_transfer_prologue(struct spi_master *master,
bcm2835_wr_fifo_count(bs, bs->rx_prologue);
bcm2835_wait_tx_fifo_empty(bs);
bcm2835_rd_fifo_count(bs, bs->rx_prologue);
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
dma_sync_single_for_device(master->dma_rx->device->dev,
dma_sync_single_for_device(ctlr->dma_rx->device->dev,
sg_dma_address(&tfr->rx_sg.sgl[0]),
bs->rx_prologue, DMA_FROM_DEVICE);
@ -552,11 +552,11 @@ static void bcm2835_spi_undo_prologue(struct bcm2835_spi *bs)
static void bcm2835_spi_dma_done(void *data)
{
struct spi_master *master = data;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct spi_controller *ctlr = data;
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
/* reset fifo and HW */
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
/* and terminate tx-dma as we do not have an irq for it
* because when the rx dma will terminate and this callback
@ -564,15 +564,15 @@ static void bcm2835_spi_dma_done(void *data)
* situation otherwise...
*/
if (cmpxchg(&bs->dma_pending, true, false)) {
dmaengine_terminate_async(master->dma_tx);
dmaengine_terminate_async(ctlr->dma_tx);
bcm2835_spi_undo_prologue(bs);
}
/* and mark as completed */;
complete(&master->xfer_completion);
complete(&ctlr->xfer_completion);
}
static int bcm2835_spi_prepare_sg(struct spi_master *master,
static int bcm2835_spi_prepare_sg(struct spi_controller *ctlr,
struct spi_transfer *tfr,
bool is_tx)
{
@ -587,14 +587,14 @@ static int bcm2835_spi_prepare_sg(struct spi_master *master,
if (is_tx) {
dir = DMA_MEM_TO_DEV;
chan = master->dma_tx;
chan = ctlr->dma_tx;
nents = tfr->tx_sg.nents;
sgl = tfr->tx_sg.sgl;
flags = 0 /* no tx interrupt */;
} else {
dir = DMA_DEV_TO_MEM;
chan = master->dma_rx;
chan = ctlr->dma_rx;
nents = tfr->rx_sg.nents;
sgl = tfr->rx_sg.sgl;
flags = DMA_PREP_INTERRUPT;
@ -607,7 +607,7 @@ static int bcm2835_spi_prepare_sg(struct spi_master *master,
/* set callback for rx */
if (!is_tx) {
desc->callback = bcm2835_spi_dma_done;
desc->callback_param = master;
desc->callback_param = ctlr;
}
/* submit it to DMA-engine */
@ -616,12 +616,12 @@ static int bcm2835_spi_prepare_sg(struct spi_master *master,
return dma_submit_error(cookie);
}
static int bcm2835_spi_transfer_one_dma(struct spi_master *master,
static int bcm2835_spi_transfer_one_dma(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
int ret;
/* update usage statistics */
@ -631,15 +631,15 @@ static int bcm2835_spi_transfer_one_dma(struct spi_master *master,
* Transfer first few bytes without DMA if length of first TX or RX
* sglist entry is not a multiple of 4 bytes (hardware limitation).
*/
bcm2835_spi_transfer_prologue(master, tfr, bs, cs);
bcm2835_spi_transfer_prologue(ctlr, tfr, bs, cs);
/* setup tx-DMA */
ret = bcm2835_spi_prepare_sg(master, tfr, true);
ret = bcm2835_spi_prepare_sg(ctlr, tfr, true);
if (ret)
goto err_reset_hw;
/* start TX early */
dma_async_issue_pending(master->dma_tx);
dma_async_issue_pending(ctlr->dma_tx);
/* mark as dma pending */
bs->dma_pending = 1;
@ -655,27 +655,27 @@ static int bcm2835_spi_transfer_one_dma(struct spi_master *master,
* mapping of the rx buffers still takes place
* this saves 10us or more.
*/
ret = bcm2835_spi_prepare_sg(master, tfr, false);
ret = bcm2835_spi_prepare_sg(ctlr, tfr, false);
if (ret) {
/* need to reset on errors */
dmaengine_terminate_sync(master->dma_tx);
dmaengine_terminate_sync(ctlr->dma_tx);
bs->dma_pending = false;
goto err_reset_hw;
}
/* start rx dma late */
dma_async_issue_pending(master->dma_rx);
dma_async_issue_pending(ctlr->dma_rx);
/* wait for wakeup in framework */
return 1;
err_reset_hw:
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
bcm2835_spi_undo_prologue(bs);
return ret;
}
static bool bcm2835_spi_can_dma(struct spi_master *master,
static bool bcm2835_spi_can_dma(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *tfr)
{
@ -687,21 +687,21 @@ static bool bcm2835_spi_can_dma(struct spi_master *master,
return true;
}
static void bcm2835_dma_release(struct spi_master *master)
static void bcm2835_dma_release(struct spi_controller *ctlr)
{
if (master->dma_tx) {
dmaengine_terminate_sync(master->dma_tx);
dma_release_channel(master->dma_tx);
master->dma_tx = NULL;
if (ctlr->dma_tx) {
dmaengine_terminate_sync(ctlr->dma_tx);
dma_release_channel(ctlr->dma_tx);
ctlr->dma_tx = NULL;
}
if (master->dma_rx) {
dmaengine_terminate_sync(master->dma_rx);
dma_release_channel(master->dma_rx);
master->dma_rx = NULL;
if (ctlr->dma_rx) {
dmaengine_terminate_sync(ctlr->dma_rx);
dma_release_channel(ctlr->dma_rx);
ctlr->dma_rx = NULL;
}
}
static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
static void bcm2835_dma_init(struct spi_controller *ctlr, struct device *dev)
{
struct dma_slave_config slave_config;
const __be32 *addr;
@ -709,7 +709,7 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
int ret;
/* base address in dma-space */
addr = of_get_address(master->dev.of_node, 0, NULL, NULL);
addr = of_get_address(ctlr->dev.of_node, 0, NULL, NULL);
if (!addr) {
dev_err(dev, "could not get DMA-register address - not using dma mode\n");
goto err;
@ -717,13 +717,13 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
dma_reg_base = be32_to_cpup(addr);
/* get tx/rx dma */
master->dma_tx = dma_request_slave_channel(dev, "tx");
if (!master->dma_tx) {
ctlr->dma_tx = dma_request_slave_channel(dev, "tx");
if (!ctlr->dma_tx) {
dev_err(dev, "no tx-dma configuration found - not using dma mode\n");
goto err;
}
master->dma_rx = dma_request_slave_channel(dev, "rx");
if (!master->dma_rx) {
ctlr->dma_rx = dma_request_slave_channel(dev, "rx");
if (!ctlr->dma_rx) {
dev_err(dev, "no rx-dma configuration found - not using dma mode\n");
goto err_release;
}
@ -733,7 +733,7 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
slave_config.dst_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO);
slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
ret = dmaengine_slave_config(master->dma_tx, &slave_config);
ret = dmaengine_slave_config(ctlr->dma_tx, &slave_config);
if (ret)
goto err_config;
@ -741,14 +741,14 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
slave_config.src_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO);
slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
ret = dmaengine_slave_config(master->dma_rx, &slave_config);
ret = dmaengine_slave_config(ctlr->dma_rx, &slave_config);
if (ret)
goto err_config;
/* all went well, so set can_dma */
master->can_dma = bcm2835_spi_can_dma;
ctlr->can_dma = bcm2835_spi_can_dma;
/* need to do TX AND RX DMA, so we need dummy buffers */
master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
ctlr->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;
return;
@ -756,17 +756,17 @@ static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
dev_err(dev, "issue configuring dma: %d - not using DMA mode\n",
ret);
err_release:
bcm2835_dma_release(master);
bcm2835_dma_release(ctlr);
err:
return;
}
static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
static int bcm2835_spi_transfer_one_poll(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
unsigned long timeout;
/* update usage statistics */
@ -805,22 +805,22 @@ static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
/* update usage statistics */
bs->count_transfer_irq_after_polling++;
return bcm2835_spi_transfer_one_irq(master, spi,
return bcm2835_spi_transfer_one_irq(ctlr, spi,
tfr, cs, false);
}
}
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
/* and return without waiting for completion */
return 0;
}
static int bcm2835_spi_transfer_one(struct spi_master *master,
static int bcm2835_spi_transfer_one(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *tfr)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
unsigned long spi_hz, clk_hz, cdiv, spi_used_hz;
unsigned long hz_per_byte, byte_limit;
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
@ -874,34 +874,34 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
/* run in polling mode for short transfers */
if (tfr->len < byte_limit)
return bcm2835_spi_transfer_one_poll(master, spi, tfr, cs);
return bcm2835_spi_transfer_one_poll(ctlr, spi, tfr, cs);
/* run in dma mode if conditions are right
* Note that unlike poll or interrupt mode DMA mode does not have
* this 1 idle clock cycle pattern but runs the spi clock without gaps
*/
if (master->can_dma && bcm2835_spi_can_dma(master, spi, tfr))
return bcm2835_spi_transfer_one_dma(master, spi, tfr, cs);
if (ctlr->can_dma && bcm2835_spi_can_dma(ctlr, spi, tfr))
return bcm2835_spi_transfer_one_dma(ctlr, spi, tfr, cs);
/* run in interrupt-mode */
return bcm2835_spi_transfer_one_irq(master, spi, tfr, cs, true);
return bcm2835_spi_transfer_one_irq(ctlr, spi, tfr, cs, true);
}
static int bcm2835_spi_prepare_message(struct spi_master *master,
static int bcm2835_spi_prepare_message(struct spi_controller *ctlr,
struct spi_message *msg)
{
struct spi_device *spi = msg->spi;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
int ret;
if (master->can_dma) {
if (ctlr->can_dma) {
/*
* DMA transfers are limited to 16 bit (0 to 65535 bytes) by
* the SPI HW due to DLEN. Split up transfers (32-bit FIFO
* aligned) if the limit is exceeded.
*/
ret = spi_split_transfers_maxsize(master, msg, 65532,
ret = spi_split_transfers_maxsize(ctlr, msg, 65532,
GFP_KERNEL | GFP_DMA);
if (ret)
return ret;
@ -919,19 +919,19 @@ static int bcm2835_spi_prepare_message(struct spi_master *master,
return 0;
}
static void bcm2835_spi_handle_err(struct spi_master *master,
static void bcm2835_spi_handle_err(struct spi_controller *ctlr,
struct spi_message *msg)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
/* if an error occurred and we have an active dma, then terminate */
if (cmpxchg(&bs->dma_pending, true, false)) {
dmaengine_terminate_sync(master->dma_tx);
dmaengine_terminate_sync(master->dma_rx);
dmaengine_terminate_sync(ctlr->dma_tx);
dmaengine_terminate_sync(ctlr->dma_rx);
bcm2835_spi_undo_prologue(bs);
}
/* and reset */
bcm2835_spi_reset_hw(master);
bcm2835_spi_reset_hw(ctlr);
}
static int chip_match_name(struct gpio_chip *chip, void *data)
@ -988,67 +988,68 @@ static int bcm2835_spi_setup(struct spi_device *spi)
static int bcm2835_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct spi_controller *ctlr;
struct bcm2835_spi *bs;
struct resource *res;
int err;
master = spi_alloc_master(&pdev->dev, sizeof(*bs));
if (!master)
ctlr = spi_alloc_master(&pdev->dev, sizeof(*bs));
if (!ctlr)
return -ENOMEM;
platform_set_drvdata(pdev, master);
platform_set_drvdata(pdev, ctlr);
master->mode_bits = BCM2835_SPI_MODE_BITS;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->num_chipselect = 3;
master->setup = bcm2835_spi_setup;
master->transfer_one = bcm2835_spi_transfer_one;
master->handle_err = bcm2835_spi_handle_err;
master->prepare_message = bcm2835_spi_prepare_message;
master->dev.of_node = pdev->dev.of_node;
ctlr->mode_bits = BCM2835_SPI_MODE_BITS;
ctlr->bits_per_word_mask = SPI_BPW_MASK(8);
ctlr->num_chipselect = 3;
ctlr->setup = bcm2835_spi_setup;
ctlr->transfer_one = bcm2835_spi_transfer_one;
ctlr->handle_err = bcm2835_spi_handle_err;
ctlr->prepare_message = bcm2835_spi_prepare_message;
ctlr->dev.of_node = pdev->dev.of_node;
bs = spi_master_get_devdata(master);
bs = spi_controller_get_devdata(ctlr);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bs->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(bs->regs)) {
err = PTR_ERR(bs->regs);
goto out_master_put;
goto out_controller_put;
}
bs->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(bs->clk)) {
err = PTR_ERR(bs->clk);
dev_err(&pdev->dev, "could not get clk: %d\n", err);
goto out_master_put;
goto out_controller_put;
}
bs->irq = platform_get_irq(pdev, 0);
if (bs->irq <= 0) {
dev_err(&pdev->dev, "could not get IRQ: %d\n", bs->irq);
err = bs->irq ? bs->irq : -ENODEV;
goto out_master_put;
goto out_controller_put;
}
clk_prepare_enable(bs->clk);
bcm2835_dma_init(master, &pdev->dev);
bcm2835_dma_init(ctlr, &pdev->dev);
/* initialise the hardware with the default polarities */
bcm2835_wr(bs, BCM2835_SPI_CS,
BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0,
dev_name(&pdev->dev), master);
dev_name(&pdev->dev), ctlr);
if (err) {
dev_err(&pdev->dev, "could not request IRQ: %d\n", err);
goto out_clk_disable;
}
err = devm_spi_register_master(&pdev->dev, master);
err = devm_spi_register_controller(&pdev->dev, ctlr);
if (err) {
dev_err(&pdev->dev, "could not register SPI master: %d\n", err);
dev_err(&pdev->dev, "could not register SPI controller: %d\n",
err);
goto out_clk_disable;
}
@ -1058,15 +1059,15 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
out_clk_disable:
clk_disable_unprepare(bs->clk);
out_master_put:
spi_master_put(master);
out_controller_put:
spi_controller_put(ctlr);
return err;
}
static int bcm2835_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct bcm2835_spi *bs = spi_master_get_devdata(master);
struct spi_controller *ctlr = platform_get_drvdata(pdev);
struct bcm2835_spi *bs = spi_controller_get_devdata(ctlr);
bcm2835_debugfs_remove(bs);
@ -1076,7 +1077,7 @@ static int bcm2835_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(bs->clk);
bcm2835_dma_release(master);
bcm2835_dma_release(ctlr);
return 0;
}