From c22c62db3f7388422257918c9d2582ef20d2e12d Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 2 Mar 2015 14:58:57 +0200 Subject: [PATCH] spi: dw: move to SPI core message handling This patch removes a lot of duplicate code since SPI core provides a nice message handling. Signed-off-by: Andy Shevchenko Signed-off-by: Mark Brown --- drivers/spi/spi-dw-mid.c | 4 +- drivers/spi/spi-dw.c | 183 ++++++++++----------------------------- drivers/spi/spi-dw.h | 26 ------ 3 files changed, 49 insertions(+), 164 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index a0197fd4e95c..8f68e8277a3b 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -110,7 +110,7 @@ static void dw_spi_dma_tx_done(void *arg) if (test_and_clear_bit(TX_BUSY, &dws->dma_chan_busy) & BIT(RX_BUSY)) return; - dw_spi_xfer_done(dws); + spi_finalize_current_transfer(dws->master); } static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws) @@ -155,7 +155,7 @@ static void dw_spi_dma_rx_done(void *arg) if (test_and_clear_bit(RX_BUSY, &dws->dma_chan_busy) & BIT(TX_BUSY)) return; - dw_spi_xfer_done(dws); + spi_finalize_current_transfer(dws->master); } static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 9a855bb00694..7d3ee82e10be 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -28,11 +28,6 @@ #include #endif -#define START_STATE ((void *)0) -#define RUNNING_STATE ((void *)1) -#define DONE_STATE ((void *)2) -#define ERROR_STATE ((void *)-1) - /* Slave spi_dev related */ struct chip_data { u16 cr0; @@ -143,6 +138,19 @@ static inline void dw_spi_debugfs_remove(struct dw_spi *dws) } #endif /* CONFIG_DEBUG_FS */ +static void dw_spi_set_cs(struct spi_device *spi, bool enable) +{ + struct dw_spi *dws = spi_master_get_devdata(spi->master); + struct chip_data *chip = spi_get_ctldata(spi); + + /* Chip select logic is inverted from spi_set_cs() */ + if (chip->cs_control) + chip->cs_control(!enable); + + if (!enable) + dw_writel(dws, DW_SPI_SER, BIT(spi->chip_select)); +} + /* Return the max entries we can fill into tx fifo */ static inline u32 tx_max(struct dw_spi *dws) { @@ -209,93 +217,41 @@ static void dw_reader(struct dw_spi *dws) } } -static void *next_transfer(struct dw_spi *dws) -{ - struct spi_message *msg = dws->cur_msg; - struct spi_transfer *trans = dws->cur_transfer; - - /* Move to next transfer */ - if (trans->transfer_list.next != &msg->transfers) { - dws->cur_transfer = - list_entry(trans->transfer_list.next, - struct spi_transfer, - transfer_list); - return RUNNING_STATE; - } - - return DONE_STATE; -} - /* * Note: first step is the protocol driver prepares * a dma-capable memory, and this func just need translate * the virt addr to physical */ -static int map_dma_buffers(struct dw_spi *dws) +static int map_dma_buffers(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *transfer) { - if (!dws->cur_msg->is_dma_mapped + struct dw_spi *dws = spi_master_get_devdata(master); + struct chip_data *chip = spi_get_ctldata(spi); + + if (!master->cur_msg->is_dma_mapped || !dws->dma_inited - || !dws->cur_chip->enable_dma + || !chip->enable_dma || !dws->dma_ops) return 0; - if (dws->cur_transfer->tx_dma) - dws->tx_dma = dws->cur_transfer->tx_dma; + if (transfer->tx_dma) + dws->tx_dma = transfer->tx_dma; - if (dws->cur_transfer->rx_dma) - dws->rx_dma = dws->cur_transfer->rx_dma; + if (transfer->rx_dma) + dws->rx_dma = transfer->rx_dma; return 1; } -/* Caller already set message->status; dma and pio irqs are blocked */ -static void giveback(struct dw_spi *dws) -{ - struct spi_transfer *last_transfer; - struct spi_message *msg; - - msg = dws->cur_msg; - dws->cur_msg = NULL; - dws->cur_transfer = NULL; - dws->prev_chip = dws->cur_chip; - dws->cur_chip = NULL; - dws->dma_mapped = 0; - - last_transfer = list_last_entry(&msg->transfers, struct spi_transfer, - transfer_list); - - if (!last_transfer->cs_change) - spi_chip_sel(dws, msg->spi, 0); - - spi_finalize_current_message(dws->master); -} - static void int_error_stop(struct dw_spi *dws, const char *msg) { spi_reset_chip(dws); dev_err(&dws->master->dev, "%s\n", msg); - dws->cur_msg->state = ERROR_STATE; - tasklet_schedule(&dws->pump_transfers); + dws->master->cur_msg->status = -EIO; + spi_finalize_current_transfer(dws->master); } -void dw_spi_xfer_done(struct dw_spi *dws) -{ - /* Update total byte transferred return count actual bytes read */ - dws->cur_msg->actual_length += dws->len; - - /* Move to next transfer */ - dws->cur_msg->state = next_transfer(dws); - - /* Handle end of message */ - if (dws->cur_msg->state == DONE_STATE) { - dws->cur_msg->status = 0; - giveback(dws); - } else - tasklet_schedule(&dws->pump_transfers); -} -EXPORT_SYMBOL_GPL(dw_spi_xfer_done); - static irqreturn_t interrupt_transfer(struct dw_spi *dws) { u16 irq_status = dw_readw(dws, DW_SPI_ISR); @@ -312,7 +268,7 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws) dw_reader(dws); if (dws->rx_end == dws->rx) { spi_mask_intr(dws, SPI_INT_TXEI); - dw_spi_xfer_done(dws); + spi_finalize_current_transfer(dws->master); return IRQ_HANDLED; } if (irq_status & SPI_INT_TXEI) { @@ -327,13 +283,14 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws) static irqreturn_t dw_spi_irq(int irq, void *dev_id) { - struct dw_spi *dws = dev_id; + struct spi_master *master = dev_id; + struct dw_spi *dws = spi_master_get_devdata(master); u16 irq_status = dw_readw(dws, DW_SPI_ISR) & 0x3f; if (!irq_status) return IRQ_NONE; - if (!dws->cur_msg) { + if (!master->cur_msg) { spi_mask_intr(dws, SPI_INT_TXEI); return IRQ_HANDLED; } @@ -342,7 +299,7 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id) } /* Must be called inside pump_transfers() */ -static void poll_transfer(struct dw_spi *dws) +static int poll_transfer(struct dw_spi *dws) { do { dw_writer(dws); @@ -350,17 +307,14 @@ static void poll_transfer(struct dw_spi *dws) cpu_relax(); } while (dws->rx_end > dws->rx); - dw_spi_xfer_done(dws); + return 0; } -static void pump_transfers(unsigned long data) +static int dw_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, struct spi_transfer *transfer) { - struct dw_spi *dws = (struct dw_spi *)data; - struct spi_message *message = NULL; - struct spi_transfer *transfer = NULL; - struct spi_transfer *previous = NULL; - struct spi_device *spi = NULL; - struct chip_data *chip = NULL; + struct dw_spi *dws = spi_master_get_devdata(master); + struct chip_data *chip = spi_get_ctldata(spi); u8 bits = 0; u8 imask = 0; u8 cs_change = 0; @@ -369,35 +323,8 @@ static void pump_transfers(unsigned long data) u32 speed = 0; u32 cr0 = 0; - /* Get current state information */ - message = dws->cur_msg; - transfer = dws->cur_transfer; - chip = dws->cur_chip; - spi = message->spi; - - if (message->state == ERROR_STATE) { - message->status = -EIO; - goto early_exit; - } - - /* Handle end of message */ - if (message->state == DONE_STATE) { - message->status = 0; - goto early_exit; - } - - /* Delay if requested at end of transfer */ - if (message->state == RUNNING_STATE) { - previous = list_entry(transfer->transfer_list.prev, - struct spi_transfer, - transfer_list); - if (previous->delay_usecs) - udelay(previous->delay_usecs); - } - dws->n_bytes = chip->n_bytes; dws->dma_width = chip->dma_width; - dws->cs_control = chip->cs_control; dws->rx_dma = transfer->rx_dma; dws->tx_dma = transfer->tx_dma; @@ -405,7 +332,7 @@ static void pump_transfers(unsigned long data) dws->tx_end = dws->tx + transfer->len; dws->rx = transfer->rx_buf; dws->rx_end = dws->rx + transfer->len; - dws->len = dws->cur_transfer->len; + dws->len = transfer->len; if (chip != dws->prev_chip) cs_change = 1; @@ -437,13 +364,12 @@ static void pump_transfers(unsigned long data) | (spi->mode << SPI_MODE_OFFSET) | (chip->tmode << SPI_TMOD_OFFSET); } - message->state = RUNNING_STATE; /* * Adjust transfer mode if necessary. Requires platform dependent * chipselect mechanism. */ - if (dws->cs_control) { + if (chip->cs_control) { if (dws->rx && dws->tx) chip->tmode = SPI_TMOD_TR; else if (dws->rx) @@ -456,10 +382,9 @@ static void pump_transfers(unsigned long data) } dw_writew(dws, DW_SPI_CTRL0, cr0); - spi_chip_sel(dws, spi, 1); /* Check if current transfer is a DMA transaction */ - dws->dma_mapped = map_dma_buffers(dws); + dws->dma_mapped = map_dma_buffers(master, spi, transfer); /* For poll mode just disable all interrupts */ spi_mask_intr(dws, 0xff); @@ -489,31 +414,17 @@ static void pump_transfers(unsigned long data) dws->dma_ops->dma_transfer(dws, cs_change); if (chip->poll_mode) - poll_transfer(dws); + return poll_transfer(dws); - return; - -early_exit: - giveback(dws); + return 1; } -static int dw_spi_transfer_one_message(struct spi_master *master, +static void dw_spi_handle_err(struct spi_master *master, struct spi_message *msg) { struct dw_spi *dws = spi_master_get_devdata(master); - dws->cur_msg = msg; - /* Initial message state */ - dws->cur_msg->state = START_STATE; - dws->cur_transfer = list_entry(dws->cur_msg->transfers.next, - struct spi_transfer, - transfer_list); - dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi); - - /* Launch transfers */ - tasklet_schedule(&dws->pump_transfers); - - return 0; + spi_reset_chip(dws); } /* This may be called twice for each spi dev */ @@ -637,7 +548,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) 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); + dws->name, master); if (ret < 0) { dev_err(&master->dev, "can not get IRQ\n"); goto err_free_master; @@ -649,7 +560,9 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) 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->set_cs = dw_spi_set_cs; + master->transfer_one = dw_spi_transfer_one; + master->handle_err = dw_spi_handle_err; master->max_speed_hz = dws->max_freq; master->dev.of_node = dev->of_node; @@ -664,8 +577,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) } } - tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws); - spi_master_set_devdata(master, dws); ret = devm_spi_register_master(dev, master); if (ret) { diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 1a7f083c2217..855bfdd7b433 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -96,7 +96,6 @@ struct dw_spi_dma_ops { struct dw_spi { struct spi_master *master; - struct spi_device *cur_dev; enum dw_ssi_type type; char name[16]; @@ -109,13 +108,7 @@ struct dw_spi { u16 bus_num; u16 num_cs; /* supported slave numbers */ - /* Message Transfer pump */ - struct tasklet_struct pump_transfers; - /* Current message transfer state info */ - struct spi_message *cur_msg; - struct spi_transfer *cur_transfer; - struct chip_data *cur_chip; struct chip_data *prev_chip; size_t len; void *tx; @@ -128,10 +121,8 @@ struct dw_spi { size_t rx_map_len; size_t tx_map_len; u8 n_bytes; /* current is a 1/2 bytes op */ - u8 max_bits_per_word; /* maxim is 16b */ u32 dma_width; irqreturn_t (*transfer_handler)(struct dw_spi *dws); - void (*cs_control)(u32 command); /* Dma info */ int dma_inited; @@ -182,22 +173,6 @@ static inline void spi_set_clk(struct dw_spi *dws, u16 div) dw_writel(dws, DW_SPI_BAUDR, div); } -static inline void spi_chip_sel(struct dw_spi *dws, struct spi_device *spi, - int active) -{ - u16 cs = spi->chip_select; - int gpio_val = active ? (spi->mode & SPI_CS_HIGH) : - !(spi->mode & SPI_CS_HIGH); - - if (dws->cs_control) - dws->cs_control(active); - if (gpio_is_valid(spi->cs_gpio)) - gpio_set_value(spi->cs_gpio, gpio_val); - - if (active) - dw_writel(dws, DW_SPI_SER, 1 << cs); -} - /* Disable IRQ bits */ static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) { @@ -245,7 +220,6 @@ extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); extern void dw_spi_remove_host(struct dw_spi *dws); extern int dw_spi_suspend_host(struct dw_spi *dws); extern int dw_spi_resume_host(struct dw_spi *dws); -extern void dw_spi_xfer_done(struct dw_spi *dws); /* platform related setup */ extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */ -- 2.39.5