diff options
Diffstat (limited to 'drivers/spi/spi-dw.c')
| -rw-r--r-- | drivers/spi/spi-dw.c | 76 |
1 files changed, 41 insertions, 35 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 670f0627f3bf..729215885250 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -11,10 +11,6 @@ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/dma-mapping.h> @@ -59,22 +55,20 @@ struct chip_data { #ifdef CONFIG_DEBUG_FS #define SPI_REGS_BUFSIZE 1024 -static ssize_t spi_show_regs(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) +static ssize_t dw_spi_show_regs(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) { - struct dw_spi *dws; + struct dw_spi *dws = file->private_data; char *buf; u32 len = 0; ssize_t ret; - dws = file->private_data; - buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL); if (!buf) return 0; len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, - "MRST SPI0 registers:\n"); + "%s registers:\n", dev_name(&dws->master->dev)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "=================================\n"); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, @@ -110,42 +104,41 @@ static ssize_t spi_show_regs(struct file *file, char __user *user_buf, len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "=================================\n"); - ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); + ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); kfree(buf); return ret; } -static const struct file_operations mrst_spi_regs_ops = { +static const struct file_operations dw_spi_regs_ops = { .owner = THIS_MODULE, .open = simple_open, - .read = spi_show_regs, + .read = dw_spi_show_regs, .llseek = default_llseek, }; -static int mrst_spi_debugfs_init(struct dw_spi *dws) +static int dw_spi_debugfs_init(struct dw_spi *dws) { - dws->debugfs = debugfs_create_dir("mrst_spi", NULL); + dws->debugfs = debugfs_create_dir("dw_spi", NULL); if (!dws->debugfs) return -ENOMEM; debugfs_create_file("registers", S_IFREG | S_IRUGO, - dws->debugfs, (void *)dws, &mrst_spi_regs_ops); + dws->debugfs, (void *)dws, &dw_spi_regs_ops); return 0; } -static void mrst_spi_debugfs_remove(struct dw_spi *dws) +static void dw_spi_debugfs_remove(struct dw_spi *dws) { - if (dws->debugfs) - debugfs_remove_recursive(dws->debugfs); + debugfs_remove_recursive(dws->debugfs); } #else -static inline int mrst_spi_debugfs_init(struct dw_spi *dws) +static inline int dw_spi_debugfs_init(struct dw_spi *dws) { return 0; } -static inline void mrst_spi_debugfs_remove(struct dw_spi *dws) +static inline void dw_spi_debugfs_remove(struct dw_spi *dws) { } #endif /* CONFIG_DEBUG_FS */ @@ -177,7 +170,7 @@ static inline u32 rx_max(struct dw_spi *dws) { u32 rx_left = (dws->rx_end - dws->rx) / dws->n_bytes; - return min(rx_left, (u32)dw_readw(dws, DW_SPI_RXFLR)); + return min_t(u32, rx_left, dw_readw(dws, DW_SPI_RXFLR)); } static void dw_writer(struct dw_spi *dws) @@ -228,8 +221,9 @@ static void *next_transfer(struct dw_spi *dws) struct spi_transfer, transfer_list); return RUNNING_STATE; - } else - return DONE_STATE; + } + + return DONE_STATE; } /* @@ -396,7 +390,7 @@ static void pump_transfers(unsigned long data) goto early_exit; } - /* Delay if requested at end of transfer*/ + /* Delay if requested at end of transfer */ if (message->state == RUNNING_STATE) { previous = list_entry(transfer->transfer_list.prev, struct spi_transfer, @@ -471,10 +465,12 @@ static void pump_transfers(unsigned long data) */ if (!dws->dma_mapped && !chip->poll_mode) { int templen = dws->len / dws->n_bytes; + txint_level = dws->fifo_len / 2; txint_level = (templen > txint_level) ? txint_level : templen; - imask |= SPI_INT_TXEI | SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI; + imask |= SPI_INT_TXEI | SPI_INT_TXOI | + SPI_INT_RXUI | SPI_INT_RXOI; dws->transfer_handler = interrupt_transfer; } @@ -515,7 +511,6 @@ static void pump_transfers(unsigned long data) early_exit: giveback(dws); - return; } static int dw_spi_transfer_one_message(struct spi_master *master, @@ -524,7 +519,7 @@ static int dw_spi_transfer_one_message(struct spi_master *master, struct dw_spi *dws = spi_master_get_devdata(master); dws->cur_msg = msg; - /* Initial message state*/ + /* Initial message state */ dws->cur_msg->state = START_STATE; dws->cur_transfer = list_entry(dws->cur_msg->transfers.next, struct spi_transfer, @@ -547,8 +542,7 @@ static int dw_spi_setup(struct spi_device *spi) /* Only alloc on first setup */ chip = spi_get_ctldata(spi); if (!chip) { - chip = devm_kzalloc(&spi->dev, sizeof(struct chip_data), - GFP_KERNEL); + chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); if (!chip) return -ENOMEM; spi_set_ctldata(spi, chip); @@ -596,6 +590,9 @@ static int dw_spi_setup(struct spi_device *spi) | (spi->mode << SPI_MODE_OFFSET) | (chip->tmode << SPI_TMOD_OFFSET); + if (spi->mode & SPI_LOOP) + chip->cr0 |= 1 << SPI_SRL_OFFSET; + if (gpio_is_valid(spi->cs_gpio)) { ret = gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); @@ -606,6 +603,14 @@ static int dw_spi_setup(struct spi_device *spi) return 0; } +static void dw_spi_cleanup(struct spi_device *spi) +{ + struct chip_data *chip = spi_get_ctldata(spi); + + kfree(chip); + spi_set_ctldata(spi, NULL); +} + /* Restart the controller, disable all interrupts, clean rx fifo */ static void spi_hw_init(struct dw_spi *dws) { @@ -619,6 +624,7 @@ static void spi_hw_init(struct dw_spi *dws) */ if (!dws->fifo_len) { u32 fifo; + for (fifo = 2; fifo <= 257; fifo++) { dw_writew(dws, DW_SPI_TXFLTR, fifo); if (fifo != dw_readw(dws, DW_SPI_TXFLTR)) @@ -646,8 +652,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) dws->prev_chip = NULL; dws->dma_inited = 0; dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60); - snprintf(dws->name, sizeof(dws->name), "dw_spi%d", - dws->bus_num); + snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num); ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, dws); @@ -656,11 +661,12 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) goto err_free_master; } - master->mode_bits = SPI_CPOL | SPI_CPHA; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); master->bus_num = dws->bus_num; master->num_chipselect = dws->num_cs; master->setup = dw_spi_setup; + master->cleanup = dw_spi_cleanup; master->transfer_one_message = dw_spi_transfer_one_message; master->max_speed_hz = dws->max_freq; @@ -684,7 +690,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) goto err_dma_exit; } - mrst_spi_debugfs_init(dws); + dw_spi_debugfs_init(dws); return 0; err_dma_exit: @@ -701,7 +707,7 @@ void dw_spi_remove_host(struct dw_spi *dws) { if (!dws) return; - mrst_spi_debugfs_remove(dws); + dw_spi_debugfs_remove(dws); if (dws->dma_ops && dws->dma_ops->dma_exit) dws->dma_ops->dma_exit(dws); |