Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/sg',... (c92ec7c7) · Commits · EulixOS / Software / Kernel

drivers/spi/spi-s3c64xx.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1191,8 +1191,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)

		dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
		sdd->port_id, master->num_chipselect);
		dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tDMA=[Rx-%d, Tx-%d]\n",
		mem_res,
		dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\tDMA=[Rx-%d, Tx-%d]\n",
		mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1,
		sdd->rx_dma.dmach, sdd->tx_dma.dmach);

		return 0;

drivers/spi/spi-sh-msiof.c

+9 −11

Original line number	Diff line number	Diff line
		@@ -48,8 +48,8 @@ struct sh_msiof_spi_priv {
		const struct sh_msiof_chipdata *chipdata;
		struct sh_msiof_spi_info *info;
		struct completion done;
		int tx_fifo_size;
		int rx_fifo_size;
		unsigned int tx_fifo_size;
		unsigned int rx_fifo_size;
		void *tx_dma_page;
		void *rx_dma_page;
		dma_addr_t tx_dma_addr;
		@@ -95,8 +95,6 @@ struct sh_msiof_spi_priv {
		#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
		#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */

		#define MAX_WDLEN 256U

		/* TSCR and RSCR */
		#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
		#define SCR_BRPS(i) (((i) - 1) << 8)
		@@ -850,7 +848,12 @@ static int sh_msiof_transfer_one(struct spi_master *master,
		* DMA supports 32-bit words only, hence pack 8-bit and 16-bit
		* words, with byte resp. word swapping.
		*/
		unsigned int l = min(len, MAX_WDLEN * 4);
		unsigned int l = 0;

		if (tx_buf)
		l = min(len, p->tx_fifo_size * 4);
		if (rx_buf)
		l = min(len, p->rx_fifo_size * 4);

		if (bits <= 8) {
		if (l & 3)
		@@ -963,7 +966,7 @@ static const struct sh_msiof_chipdata sh_data = {

		static const struct sh_msiof_chipdata r8a779x_data = {
		.tx_fifo_size = 64,
		.rx_fifo_size = 256,
		.rx_fifo_size = 64,
		.master_flags = SPI_MASTER_MUST_TX,
		};

		@@ -1265,11 +1268,6 @@ static int sh_msiof_spi_remove(struct platform_device *pdev)

		static const struct platform_device_id spi_driver_ids[] = {
		{ "spi_sh_msiof", (kernel_ulong_t)&sh_data },
		{ "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
		{ "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
		{ "spi_r8a7792_msiof", (kernel_ulong_t)&r8a779x_data },
		{ "spi_r8a7793_msiof", (kernel_ulong_t)&r8a779x_data },
		{ "spi_r8a7794_msiof", (kernel_ulong_t)&r8a779x_data },
		{},
		};
		MODULE_DEVICE_TABLE(platform, spi_driver_ids);

drivers/spi/spi.c

+178 −6

Original line number	Diff line number	Diff line
		@@ -67,11 +67,141 @@ modalias_show(struct device dev, struct device_attribute a, char *buf)
		}
		static DEVICE_ATTR_RO(modalias);

		#define SPI_STATISTICS_ATTRS(field, file) \
		static ssize_t spi_master_##field##_show(struct device *dev, \
		struct device_attribute *attr, \
		char *buf) \
		{ \
		struct spi_master *master = container_of(dev, \
		struct spi_master, dev); \
		return spi_statistics_##field##_show(&master->statistics, buf); \
		} \
		static struct device_attribute dev_attr_spi_master_##field = { \
		.attr = { .name = file, .mode = S_IRUGO }, \
		.show = spi_master_##field##_show, \
		}; \
		static ssize_t spi_device_##field##_show(struct device *dev, \
		struct device_attribute *attr, \
		char *buf) \
		{ \
		struct spi_device *spi = container_of(dev, \
		struct spi_device, dev); \
		return spi_statistics_##field##_show(&spi->statistics, buf); \
		} \
		static struct device_attribute dev_attr_spi_device_##field = { \
		.attr = { .name = file, .mode = S_IRUGO }, \
		.show = spi_device_##field##_show, \
		}

		#define SPI_STATISTICS_SHOW_NAME(name, file, field, format_string) \
		static ssize_t spi_statistics_##name##_show(struct spi_statistics *stat, \
		char *buf) \
		{ \
		unsigned long flags; \
		ssize_t len; \
		spin_lock_irqsave(&stat->lock, flags); \
		len = sprintf(buf, format_string, stat->field); \
		spin_unlock_irqrestore(&stat->lock, flags); \
		return len; \
		} \
		SPI_STATISTICS_ATTRS(name, file)

		#define SPI_STATISTICS_SHOW(field, format_string) \
		SPI_STATISTICS_SHOW_NAME(field, __stringify(field), \
		field, format_string)

		SPI_STATISTICS_SHOW(messages, "%lu");
		SPI_STATISTICS_SHOW(transfers, "%lu");
		SPI_STATISTICS_SHOW(errors, "%lu");
		SPI_STATISTICS_SHOW(timedout, "%lu");

		SPI_STATISTICS_SHOW(spi_sync, "%lu");
		SPI_STATISTICS_SHOW(spi_sync_immediate, "%lu");
		SPI_STATISTICS_SHOW(spi_async, "%lu");

		SPI_STATISTICS_SHOW(bytes, "%llu");
		SPI_STATISTICS_SHOW(bytes_rx, "%llu");
		SPI_STATISTICS_SHOW(bytes_tx, "%llu");

		static struct attribute *spi_dev_attrs[] = {
		&dev_attr_modalias.attr,
		NULL,
		};
		ATTRIBUTE_GROUPS(spi_dev);

		static const struct attribute_group spi_dev_group = {
		.attrs = spi_dev_attrs,
		};

		static struct attribute *spi_device_statistics_attrs[] = {
		&dev_attr_spi_device_messages.attr,
		&dev_attr_spi_device_transfers.attr,
		&dev_attr_spi_device_errors.attr,
		&dev_attr_spi_device_timedout.attr,
		&dev_attr_spi_device_spi_sync.attr,
		&dev_attr_spi_device_spi_sync_immediate.attr,
		&dev_attr_spi_device_spi_async.attr,
		&dev_attr_spi_device_bytes.attr,
		&dev_attr_spi_device_bytes_rx.attr,
		&dev_attr_spi_device_bytes_tx.attr,
		NULL,
		};

		static const struct attribute_group spi_device_statistics_group = {
		.name = "statistics",
		.attrs = spi_device_statistics_attrs,
		};

		static const struct attribute_group *spi_dev_groups[] = {
		&spi_dev_group,
		&spi_device_statistics_group,
		NULL,
		};

		static struct attribute *spi_master_statistics_attrs[] = {
		&dev_attr_spi_master_messages.attr,
		&dev_attr_spi_master_transfers.attr,
		&dev_attr_spi_master_errors.attr,
		&dev_attr_spi_master_timedout.attr,
		&dev_attr_spi_master_spi_sync.attr,
		&dev_attr_spi_master_spi_sync_immediate.attr,
		&dev_attr_spi_master_spi_async.attr,
		&dev_attr_spi_master_bytes.attr,
		&dev_attr_spi_master_bytes_rx.attr,
		&dev_attr_spi_master_bytes_tx.attr,
		NULL,
		};

		static const struct attribute_group spi_master_statistics_group = {
		.name = "statistics",
		.attrs = spi_master_statistics_attrs,
		};

		static const struct attribute_group *spi_master_groups[] = {
		&spi_master_statistics_group,
		NULL,
		};

		void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
		struct spi_transfer *xfer,
		struct spi_master *master)
		{
		unsigned long flags;

		spin_lock_irqsave(&stats->lock, flags);

		stats->transfers++;

		stats->bytes += xfer->len;
		if ((xfer->tx_buf) &&
		(xfer->tx_buf != master->dummy_tx))
		stats->bytes_tx += xfer->len;
		if ((xfer->rx_buf) &&
		(xfer->rx_buf != master->dummy_rx))
		stats->bytes_rx += xfer->len;

		spin_unlock_irqrestore(&stats->lock, flags);
		}
		EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats);

		/* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
		* and the sysfs version makes coldplug work too.
		@@ -249,6 +379,9 @@ struct spi_device spi_alloc_device(struct spi_master master)
		spi->dev.bus = &spi_bus_type;
		spi->dev.release = spidev_release;
		spi->cs_gpio = -ENOENT;

		spin_lock_init(&spi->statistics.lock);

		device_initialize(&spi->dev);
		return spi;
		}
		@@ -476,21 +609,30 @@ static int spi_map_buf(struct spi_master master, struct device dev,
		enum dma_data_direction dir)
		{
		const bool vmalloced_buf = is_vmalloc_addr(buf);
		const int desc_len = vmalloced_buf ? PAGE_SIZE : master->max_dma_len;
		const int sgs = DIV_ROUND_UP(len, desc_len);
		int desc_len;
		int sgs;
		struct page *vm_page;
		void *sg_buf;
		size_t min;
		int i, ret;

		if (vmalloced_buf) {
		desc_len = PAGE_SIZE;
		sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len);
		} else {
		desc_len = master->max_dma_len;
		sgs = DIV_ROUND_UP(len, desc_len);
		}

		ret = sg_alloc_table(sgt, sgs, GFP_KERNEL);
		if (ret != 0)
		return ret;

		for (i = 0; i < sgs; i++) {
		min = min_t(size_t, len, desc_len);

		if (vmalloced_buf) {
		min = min_t(size_t,
		len, desc_len - offset_in_page(buf));
		vm_page = vmalloc_to_page(buf);
		if (!vm_page) {
		sg_free_table(sgt);
		@@ -499,6 +641,7 @@ static int spi_map_buf(struct spi_master master, struct device dev,
		sg_set_page(&sgt->sgl[i], vm_page,
		min, offset_in_page(buf));
		} else {
		min = min_t(size_t, len, desc_len);
		sg_buf = buf;
		sg_set_buf(&sgt->sgl[i], sg_buf, min);
		}
		@@ -703,17 +846,29 @@ static int spi_transfer_one_message(struct spi_master *master,
		bool keep_cs = false;
		int ret = 0;
		unsigned long ms = 1;
		struct spi_statistics *statm = &master->statistics;
		struct spi_statistics *stats = &msg->spi->statistics;

		spi_set_cs(msg->spi, true);

		SPI_STATISTICS_INCREMENT_FIELD(statm, messages);
		SPI_STATISTICS_INCREMENT_FIELD(stats, messages);

		list_for_each_entry(xfer, &msg->transfers, transfer_list) {
		trace_spi_transfer_start(msg, xfer);

		spi_statistics_add_transfer_stats(statm, xfer, master);
		spi_statistics_add_transfer_stats(stats, xfer, master);

		if (xfer->tx_buf \|\| xfer->rx_buf) {
		reinit_completion(&master->xfer_completion);

		ret = master->transfer_one(master, msg->spi, xfer);
		if (ret < 0) {
		SPI_STATISTICS_INCREMENT_FIELD(statm,
		errors);
		SPI_STATISTICS_INCREMENT_FIELD(stats,
		errors);
		dev_err(&msg->spi->dev,
		"SPI transfer failed: %d\n", ret);
		goto out;
		@@ -729,6 +884,10 @@ static int spi_transfer_one_message(struct spi_master *master,
		}

		if (ms == 0) {
		SPI_STATISTICS_INCREMENT_FIELD(statm,
		timedout);
		SPI_STATISTICS_INCREMENT_FIELD(stats,
		timedout);
		dev_err(&msg->spi->dev,
		"SPI transfer timed out\n");
		msg->status = -ETIMEDOUT;
		@@ -1430,10 +1589,10 @@ static struct class spi_master_class = {
		.name = "spi_master",
		.owner = THIS_MODULE,
		.dev_release = spi_master_release,
		.dev_groups = spi_master_groups,
		};



		/**
		* spi_alloc_master - allocate SPI master controller
		* @dev: the controller, possibly using the platform_bus
		@@ -1599,6 +1758,8 @@ int spi_register_master(struct spi_master *master)
		goto done;
		}
		}
		/* add statistics */
		spin_lock_init(&master->statistics.lock);

		mutex_lock(&board_lock);
		list_add_tail(&master->list, &spi_master_list);
		@@ -1966,6 +2127,9 @@ static int __spi_async(struct spi_device spi, struct spi_message message)

		message->spi = spi;

		SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_async);
		SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_async);

		trace_spi_message_submit(message);

		return master->transfer(spi, message);
		@@ -2102,6 +2266,9 @@ static int __spi_sync(struct spi_device spi, struct spi_message message,
		message->context = &done;
		message->spi = spi;

		SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_sync);
		SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync);

		if (!bus_locked)
		mutex_lock(&master->bus_lock_mutex);

		@@ -2129,8 +2296,13 @@ static int __spi_sync(struct spi_device spi, struct spi_message message,
		/* Push out the messages in the calling context if we
		* can.
		*/
		if (master->transfer == spi_queued_transfer)
		if (master->transfer == spi_queued_transfer) {
		SPI_STATISTICS_INCREMENT_FIELD(&master->statistics,
		spi_sync_immediate);
		SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics,
		spi_sync_immediate);
		__spi_pump_messages(master, false);
		}

		wait_for_completion(&done);
		status = message->status;

drivers/spi/spidev.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -709,7 +709,7 @@ static int spidev_probe(struct spi_device *spi)

		/*
		* spidev should never be referenced in DT without a specific
		* compatbile string, it is a Linux implementation thing
		* compatible string, it is a Linux implementation thing
		* rather than a description of the hardware.
		*/
		if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {

include/linux/spi/spi.h

+64 −0

Original line number	Diff line number	Diff line
		@@ -23,6 +23,8 @@
		#include <linux/scatterlist.h>

		struct dma_chan;
		struct spi_master;
		struct spi_transfer;

		/*
		* INTERFACES between SPI master-side drivers and SPI infrastructure.
		@@ -30,6 +32,59 @@ struct dma_chan;
		*/
		extern struct bus_type spi_bus_type;

		/**
		* struct spi_statistics - statistics for spi transfers
		* @clock: lock protecting this structure
		*
		* @messages: number of spi-messages handled
		* @transfers: number of spi_transfers handled
		* @errors: number of errors during spi_transfer
		* @timedout: number of timeouts during spi_transfer
		*
		* @spi_sync: number of times spi_sync is used
		* @spi_sync_immediate:
		* number of times spi_sync is executed immediately
		* in calling context without queuing and scheduling
		* @spi_async: number of times spi_async is used
		*
		* @bytes: number of bytes transferred to/from device
		* @bytes_tx: number of bytes sent to device
		* @bytes_rx: number of bytes received from device
		*
		*/
		struct spi_statistics {
		spinlock_t lock; /* lock for the whole structure */

		unsigned long messages;
		unsigned long transfers;
		unsigned long errors;
		unsigned long timedout;

		unsigned long spi_sync;
		unsigned long spi_sync_immediate;
		unsigned long spi_async;

		unsigned long long bytes;
		unsigned long long bytes_rx;
		unsigned long long bytes_tx;

		};

		void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
		struct spi_transfer *xfer,
		struct spi_master *master);

		#define SPI_STATISTICS_ADD_TO_FIELD(stats, field, count) \
		do { \
		unsigned long flags; \
		spin_lock_irqsave(&(stats)->lock, flags); \
		(stats)->field += count; \
		spin_unlock_irqrestore(&(stats)->lock, flags); \
		} while (0)

		#define SPI_STATISTICS_INCREMENT_FIELD(stats, field) \
		SPI_STATISTICS_ADD_TO_FIELD(stats, field, 1)

		/**
		* struct spi_device - Master side proxy for an SPI slave device
		* @dev: Driver model representation of the device.
		@@ -60,6 +115,8 @@ extern struct bus_type spi_bus_type;
		* @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when
		* when not using a GPIO line)
		*
		* @statistics: statistics for the spi_device
		*
		* A @spi_device is used to interchange data between an SPI slave
		* (usually a discrete chip) and CPU memory.
		*
		@@ -98,6 +155,9 @@ struct spi_device {
		char modalias[SPI_NAME_SIZE];
		int cs_gpio; /* chip select gpio */

		/* the statistics */
		struct spi_statistics statistics;

		/*
		* likely need more hooks for more protocol options affecting how
		* the controller talks to each chip, like:
		@@ -296,6 +356,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
		* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
		* number. Any individual value may be -ENOENT for CS lines that
		* are not GPIOs (driven by the SPI controller itself).
		* @statistics: statistics for the spi_master
		* @dma_tx: DMA transmit channel
		* @dma_rx: DMA receive channel
		* @dummy_rx: dummy receive buffer for full-duplex devices
		@@ -452,6 +513,9 @@ struct spi_master {
		/* gpio chip select */
		int *cs_gpios;

		/* statistics */
		struct spi_statistics statistics;

		/* DMA channels for use with core dmaengine helpers */
		struct dma_chan *dma_tx;
		struct dma_chan *dma_rx;