diff options
Diffstat (limited to 'target/linux/generic/pending-4.4/080-spi-introduce-accelerated-read-support-for-spi-flash.patch')
| -rw-r--r-- | target/linux/generic/pending-4.4/080-spi-introduce-accelerated-read-support-for-spi-flash.patch | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/target/linux/generic/pending-4.4/080-spi-introduce-accelerated-read-support-for-spi-flash.patch b/target/linux/generic/pending-4.4/080-spi-introduce-accelerated-read-support-for-spi-flash.patch deleted file mode 100644 index 5e116b0bbf..0000000000 --- a/target/linux/generic/pending-4.4/080-spi-introduce-accelerated-read-support-for-spi-flash.patch +++ /dev/null @@ -1,179 +0,0 @@ -From 556351f14e74db4cd3ddde386457edce7bf0b27f Mon Sep 17 00:00:00 2001 -From: Vignesh R <vigneshr@ti.com> -Date: Fri, 11 Dec 2015 09:39:56 +0530 -Subject: [PATCH] spi: introduce accelerated read support for spi flash devices - -In addition to providing direct access to SPI bus, some spi controller -hardwares (like ti-qspi) provide special port (like memory mapped port) -that are optimized to improve SPI flash read performance. -This means the controller can automatically send the SPI signals -required to read data from the SPI flash device. -For this, SPI controller needs to know flash specific information like -read command to use, dummy bytes and address width. - -Introduce spi_flash_read() interface to support accelerated read -over SPI flash devices. SPI master drivers can implement this callback to -support interfaces such as memory mapped read etc. m25p80 flash driver -and other flash drivers can call this make use of such interfaces. The -interface should only be used with SPI flashes and cannot be used with -other SPI devices. - -Signed-off-by: Vignesh R <vigneshr@ti.com> -Signed-off-by: Mark Brown <broonie@kernel.org> ---- - ---- a/drivers/spi/spi.c -+++ b/drivers/spi/spi.c -@@ -1135,6 +1135,7 @@ static void __spi_pump_messages(struct s - } - } - -+ mutex_lock(&master->bus_lock_mutex); - trace_spi_message_start(master->cur_msg); - - if (master->prepare_message) { -@@ -1144,6 +1145,7 @@ static void __spi_pump_messages(struct s - "failed to prepare message: %d\n", ret); - master->cur_msg->status = ret; - spi_finalize_current_message(master); -+ mutex_unlock(&master->bus_lock_mutex); - return; - } - master->cur_msg_prepared = true; -@@ -1153,6 +1155,7 @@ static void __spi_pump_messages(struct s - if (ret) { - master->cur_msg->status = ret; - spi_finalize_current_message(master); -+ mutex_unlock(&master->bus_lock_mutex); - return; - } - -@@ -1160,8 +1163,10 @@ static void __spi_pump_messages(struct s - if (ret) { - dev_err(&master->dev, - "failed to transfer one message from queue\n"); -+ mutex_unlock(&master->bus_lock_mutex); - return; - } -+ mutex_unlock(&master->bus_lock_mutex); - } - - /** -@@ -2329,6 +2334,46 @@ int spi_async_locked(struct spi_device * - EXPORT_SYMBOL_GPL(spi_async_locked); - - -+int spi_flash_read(struct spi_device *spi, -+ struct spi_flash_read_message *msg) -+ -+{ -+ struct spi_master *master = spi->master; -+ int ret; -+ -+ if ((msg->opcode_nbits == SPI_NBITS_DUAL || -+ msg->addr_nbits == SPI_NBITS_DUAL) && -+ !(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD))) -+ return -EINVAL; -+ if ((msg->opcode_nbits == SPI_NBITS_QUAD || -+ msg->addr_nbits == SPI_NBITS_QUAD) && -+ !(spi->mode & SPI_TX_QUAD)) -+ return -EINVAL; -+ if (msg->data_nbits == SPI_NBITS_DUAL && -+ !(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD))) -+ return -EINVAL; -+ if (msg->data_nbits == SPI_NBITS_QUAD && -+ !(spi->mode & SPI_RX_QUAD)) -+ return -EINVAL; -+ -+ if (master->auto_runtime_pm) { -+ ret = pm_runtime_get_sync(master->dev.parent); -+ if (ret < 0) { -+ dev_err(&master->dev, "Failed to power device: %d\n", -+ ret); -+ return ret; -+ } -+ } -+ mutex_lock(&master->bus_lock_mutex); -+ ret = master->spi_flash_read(spi, msg); -+ mutex_unlock(&master->bus_lock_mutex); -+ if (master->auto_runtime_pm) -+ pm_runtime_put(master->dev.parent); -+ -+ return ret; -+} -+EXPORT_SYMBOL_GPL(spi_flash_read); -+ - /*-------------------------------------------------------------------------*/ - - /* Utility methods for SPI master protocol drivers, layered on ---- a/include/linux/spi/spi.h -+++ b/include/linux/spi/spi.h -@@ -25,6 +25,7 @@ - struct dma_chan; - struct spi_master; - struct spi_transfer; -+struct spi_flash_read_message; - - /* - * INTERFACES between SPI master-side drivers and SPI infrastructure. -@@ -361,6 +362,8 @@ static inline void spi_unregister_driver - * @handle_err: the subsystem calls the driver to handle an error that occurs - * in the generic implementation of transfer_one_message(). - * @unprepare_message: undo any work done by prepare_message(). -+ * @spi_flash_read: to support spi-controller hardwares that provide -+ * accelerated interface to read from flash devices. - * @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). -@@ -507,6 +510,8 @@ struct spi_master { - struct spi_message *message); - int (*unprepare_message)(struct spi_master *master, - struct spi_message *message); -+ int (*spi_flash_read)(struct spi_device *spi, -+ struct spi_flash_read_message *msg); - - /* - * These hooks are for drivers that use a generic implementation -@@ -999,6 +1004,42 @@ static inline ssize_t spi_w8r16be(struct - return be16_to_cpu(result); - } - -+/** -+ * struct spi_flash_read_message - flash specific information for -+ * spi-masters that provide accelerated flash read interfaces -+ * @buf: buffer to read data -+ * @from: offset within the flash from where data is to be read -+ * @len: length of data to be read -+ * @retlen: actual length of data read -+ * @read_opcode: read_opcode to be used to communicate with flash -+ * @addr_width: number of address bytes -+ * @dummy_bytes: number of dummy bytes -+ * @opcode_nbits: number of lines to send opcode -+ * @addr_nbits: number of lines to send address -+ * @data_nbits: number of lines for data -+ */ -+struct spi_flash_read_message { -+ void *buf; -+ loff_t from; -+ size_t len; -+ size_t retlen; -+ u8 read_opcode; -+ u8 addr_width; -+ u8 dummy_bytes; -+ u8 opcode_nbits; -+ u8 addr_nbits; -+ u8 data_nbits; -+}; -+ -+/* SPI core interface for flash read support */ -+static inline bool spi_flash_read_supported(struct spi_device *spi) -+{ -+ return spi->master->spi_flash_read ? true : false; -+} -+ -+int spi_flash_read(struct spi_device *spi, -+ struct spi_flash_read_message *msg); -+ - /*---------------------------------------------------------------------------*/ - - /* |