From 131b17d42de6194fa960132c1f62c29923c4f20c Mon Sep 17 00:00:00 2001 From: Bryan Wu Date: Tue, 4 Dec 2007 23:45:12 -0800 Subject: [PATCH] spi: initial BF54x SPI support Initial BF54x SPI support - support BF54x SPI0 - clean up some code (whitespace etc) - will support multiports in the future - start using portmux calls Signed-off-by: Bryan Wu Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/spi_bfin5xx.c | 139 +++++++++--------- .../asm-blackfin/mach-bf548/defBF54x_base.h | 17 +++ 2 files changed, 86 insertions(+), 70 deletions(-) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index 2ef11bb70b2e..805f03bb5ef9 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -1,17 +1,20 @@ /* - * File: drivers/spi/bfin5xx_spi.c - * Based on: N/A - * Author: Luke Yang (Analog Devices Inc.) + * File: drivers/spi/bfin5xx_spi.c + * Maintainer: + * Bryan Wu + * Original Author: + * Luke Yang (Analog Devices Inc.) * - * Created: March. 10th 2006 - * Description: SPI controller driver for Blackfin 5xx - * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * Created: March. 10th 2006 + * Description: SPI controller driver for Blackfin BF5xx + * Bugs: Enter bugs at http://blackfin.uclinux.org/ * * Modified: * March 10, 2006 bfin5xx_spi.c Created. (Luke Yang) * August 7, 2006 added full duplex mode (Axel Weiss & Luke Yang) + * July 17, 2007 add support for BF54x SPI0 controller (Bryan Wu) * - * Copyright 2004-2006 Analog Devices Inc. + * Copyright 2004-2007 Analog Devices Inc. * * This program is free software ; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -31,27 +34,27 @@ #include #include +#include #include +#include #include +#include #include #include #include #include #include #include -#include -#include -#include -#include #include - +#include #include -MODULE_AUTHOR("Luke Yang"); -MODULE_DESCRIPTION("Blackfin 5xx SPI Contoller"); +MODULE_AUTHOR("Bryan Wu, Luke Yang"); +MODULE_DESCRIPTION("Blackfin BF5xx SPI Contoller Driver"); MODULE_LICENSE("GPL"); +#define DRV_NAME "bfin-spi-master" #define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0) #define DEFINE_SPI_REG(reg, off) \ @@ -124,6 +127,7 @@ struct chip_data { u16 flag; u8 chip_select_num; + u8 chip_select_requested; u8 n_bytes; u8 width; /* 0 or 1 */ u8 enable_dma; @@ -188,53 +192,37 @@ static void restore_state(struct driver_data *drv_data) bfin_spi_disable(drv_data); dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n"); -#if defined(CONFIG_BF534) || defined(CONFIG_BF536) || defined(CONFIG_BF537) - dev_dbg(&drv_data->pdev->dev, + if (!chip->chip_select_requested) { + + dev_dbg(&drv_data->pdev->dev, "chip select number is %d\n", chip->chip_select_num); - - switch (chip->chip_select_num) { - case 1: - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3c00); - SSYNC(); - break; - case 2: - case 3: - bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJSE_SPI); - SSYNC(); - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800); - SSYNC(); - break; + switch (chip->chip_select_num) { + case 1: + peripheral_request(P_SPI0_SSEL1, DRV_NAME); + break; + case 2: + peripheral_request(P_SPI0_SSEL2, DRV_NAME); + break; + case 3: + peripheral_request(P_SPI0_SSEL3, DRV_NAME); + break; + case 4: + peripheral_request(P_SPI0_SSEL4, DRV_NAME); + break; + case 5: + peripheral_request(P_SPI0_SSEL5, DRV_NAME); + break; + case 6: + peripheral_request(P_SPI0_SSEL6, DRV_NAME); + break; + case 7: + peripheral_request(P_SPI0_SSEL7, DRV_NAME); + break; + } - case 4: - bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS4E_SPI); - SSYNC(); - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3840); - SSYNC(); - break; - - case 5: - bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS5E_SPI); - SSYNC(); - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3820); - SSYNC(); - break; - - case 6: - bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PFS6E_SPI); - SSYNC(); - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3810); - SSYNC(); - break; - - case 7: - bfin_write_PORT_MUX(bfin_read_PORT_MUX() | PJCE_SPI); - SSYNC(); - bfin_write_PORTF_FER(bfin_read_PORTF_FER() | 0x3800); - SSYNC(); - break; + chip->chip_select_requested = 1; } -#endif /* Load the registers */ write_CTRL(chip->ctl_reg); @@ -277,7 +265,7 @@ static void null_reader(struct driver_data *drv_data) static void u8_writer(struct driver_data *drv_data) { - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "cr8-s is 0x%x\n", read_STAT()); while (drv_data->tx < drv_data->tx_end) { write_TDBR(*(u8 *) (drv_data->tx)); @@ -316,7 +304,7 @@ static void u8_cs_chg_writer(struct driver_data *drv_data) static void u8_reader(struct driver_data *drv_data) { - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "cr-8 is 0x%x\n", read_STAT()); /* clear TDBR buffer before read(else it will be shifted out) */ @@ -403,7 +391,7 @@ static void u8_cs_chg_duplex(struct driver_data *drv_data) static void u16_writer(struct driver_data *drv_data) { - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "cr16 is 0x%x\n", read_STAT()); while (drv_data->tx < drv_data->tx_end) { @@ -700,9 +688,9 @@ static void pump_transfers(unsigned long data) drv_data->write = drv_data->tx ? chip->write : null_writer; drv_data->read = drv_data->rx ? chip->read : null_reader; drv_data->duplex = chip->duplex ? chip->duplex : null_writer; - dev_dbg(&drv_data->pdev->dev, - "transfer: drv_data->write is %p, chip->write is %p, null_wr is %p\n", - drv_data->write, chip->write, null_writer); + dev_dbg(&drv_data->pdev->dev, "transfer: ", + "drv_data->write is %p, chip->write is %p, null_wr is %p\n", + drv_data->write, chip->write, null_writer); /* speed and width has been set on per message */ message->state = RUNNING_STATE; @@ -816,7 +804,7 @@ static void pump_transfers(unsigned long data) /* full duplex mode */ BUG_ON((drv_data->tx_end - drv_data->tx) != (drv_data->rx_end - drv_data->rx)); - cr = (read_CTRL() & (~BIT_CTL_TIMOD)); + cr = (read_CTRL() & (~BIT_CTL_TIMOD)); cr |= CFG_SPI_WRITE | (width << 8) | (CFG_SPI_ENABLE << 14); dev_dbg(&drv_data->pdev->dev, @@ -834,7 +822,7 @@ static void pump_transfers(unsigned long data) cr = (read_CTRL() & (~BIT_CTL_TIMOD)); cr |= CFG_SPI_WRITE | (width << 8) | (CFG_SPI_ENABLE << 14); - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "IO write: cr is 0x%x\n", cr); write_CTRL(cr); @@ -849,7 +837,7 @@ static void pump_transfers(unsigned long data) cr = (read_CTRL() & (~BIT_CTL_TIMOD)); cr |= CFG_SPI_READ | (width << 8) | (CFG_SPI_ENABLE << 14); - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "IO read: cr is 0x%x\n", cr); write_CTRL(cr); @@ -861,7 +849,7 @@ static void pump_transfers(unsigned long data) } if (!tranf_success) { - dev_dbg(&drv_data->pdev->dev, + dev_dbg(&drv_data->pdev->dev, "IO write error!\n"); message->state = ERROR_STATE; } else { @@ -881,9 +869,11 @@ static void pump_transfers(unsigned long data) /* pop a msg from queue and kick off real transfer */ static void pump_messages(struct work_struct *work) { - struct driver_data *drv_data = container_of(work, struct driver_data, pump_messages); + struct driver_data *drv_data; unsigned long flags; + drv_data = container_of(work, struct driver_data, pump_messages); + /* Lock queue and check for queue work */ spin_lock_irqsave(&drv_data->lock, flags); if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) { @@ -916,8 +906,8 @@ static void pump_messages(struct work_struct *work) "got a message to pump, state is set to: baud %d, flag 0x%x, ctl 0x%x\n", drv_data->cur_chip->baud, drv_data->cur_chip->flag, drv_data->cur_chip->ctl_reg); - - dev_dbg(&drv_data->pdev->dev, + + dev_dbg(&drv_data->pdev->dev, "the first transfer len is %d\n", drv_data->cur_transfer->len); @@ -1193,6 +1183,15 @@ static int __init bfin5xx_spi_probe(struct platform_device *pdev) dev_err(&pdev->dev, "can not alloc spi_master\n"); return -ENOMEM; } + + if (peripheral_request(P_SPI0_SCK, DRV_NAME) || + peripheral_request(P_SPI0_MISO, DRV_NAME) || + peripheral_request(P_SPI0_MOSI, DRV_NAME)) { + + dev_err(&pdev->dev, ": Requesting Peripherals failed\n"); + goto out_error_queue_alloc; + } + drv_data = spi_master_get_devdata(master); drv_data->master = master; drv_data->master_info = platform_info; diff --git a/include/asm-blackfin/mach-bf548/defBF54x_base.h b/include/asm-blackfin/mach-bf548/defBF54x_base.h index da979cb62f7d..319a48590c9c 100644 --- a/include/asm-blackfin/mach-bf548/defBF54x_base.h +++ b/include/asm-blackfin/mach-bf548/defBF54x_base.h @@ -1644,8 +1644,25 @@ #define RESTART 0x20 /* Work Unit Transitions */ #define DI_SEL 0x40 /* Data Interrupt Timing Select */ #define DI_EN 0x80 /* Data Interrupt Enable */ + #define NDSIZE 0xf00 /* Flex Descriptor Size */ +#define NDSIZE_0 0x0000 /* Next Descriptor Size = 0 (Stop/Autobuffer) */ +#define NDSIZE_1 0x0100 /* Next Descriptor Size = 1 */ +#define NDSIZE_2 0x0200 /* Next Descriptor Size = 2 */ +#define NDSIZE_3 0x0300 /* Next Descriptor Size = 3 */ +#define NDSIZE_4 0x0400 /* Next Descriptor Size = 4 */ +#define NDSIZE_5 0x0500 /* Next Descriptor Size = 5 */ +#define NDSIZE_6 0x0600 /* Next Descriptor Size = 6 */ +#define NDSIZE_7 0x0700 /* Next Descriptor Size = 7 */ +#define NDSIZE_8 0x0800 /* Next Descriptor Size = 8 */ +#define NDSIZE_9 0x0900 /* Next Descriptor Size = 9 */ + #define DMAFLOW 0xf000 /* Next Operation */ +#define DMAFLOW_STOP 0x0000 /* Stop Mode */ +#define DMAFLOW_AUTO 0x1000 /* Autobuffer Mode */ +#define DMAFLOW_ARRAY 0x4000 /* Descriptor Array Mode */ +#define DMAFLOW_SMALL 0x6000 /* Small Model Descriptor List Mode */ +#define DMAFLOW_LARGE 0x7000 /* Large Model Descriptor List Mode */ /* Bit masks for DMAx_IRQ_STATUS, MDMA_Sx_IRQ_STATUS, MDMA_Dx_IRQ_STATUS */