"Hemanth V" <hemanthv@xxxxxx> writes:
> This patch adds support for McSPI slave and FIFO. DMA and FIFO
> could be enabled together for better throughput. Platform config
> parameters have been added to enable these features on any particular
> McSPI controller.
>
> FIFO can be enabled by defining fifo_depth parameter. fifo_depth needs
> to be a multiple of buffer size that is used for read/write.
>
> These features are useful when you have high throughput devices
> like WLAN or Modem connected over SPI.
>
> Signed-off-by: Hemanth V <hemanthv@xxxxxx>
>
> ---
> arch/arm/mach-omap2/board-3430sdp.c | 19 +
> arch/arm/mach-omap2/devices.c | 16 +
> arch/arm/mach-omap2/mux.c | 11
> arch/arm/plat-omap/include/mach/mcspi.h | 13 +
> arch/arm/plat-omap/include/mach/mux.h | 7
> drivers/spi/omap2_mcspi.c | 353 ++++++++++++++++++++++++++++----
> 6 files changed, 379 insertions(+), 40 deletions(-)
I think you should break this up into a series:
1) SPI driver changes (which could go upstream after review/approval)
2) mux changes
3) OMAP init changes (devices.c)
4) SDP changes, which are debug only
Where (2) and (3) could probably be combined.
> Index: linux-omap-2.6/arch/arm/mach-omap2/board-3430sdp.c
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/mach-omap2/board-3430sdp.c 2009-05-14
> 12:38:50.000000000 +0530
> +++ linux-omap-2.6/arch/arm/mach-omap2/board-3430sdp.c 2009-05-14
> 19:48:35.000000000 +0530
> @@ -228,6 +228,13 @@
> .single_channel = 1, /* 0: slave, 1: master */
> };
>
> +#ifdef CONFIG_SPI_DEBUG
> +static struct omap2_mcspi_device_config dummy_mcspi_config = {
> + .turbo_mode = 0,
> + .single_channel = 1, /* 0: slave, 1: master */
> +};
> +#endif
> +
> static struct spi_board_info sdp3430_spi_board_info[] __initdata = {
> [0] = {
> /*
> @@ -242,6 +249,18 @@
> .irq = 0,
> .platform_data = &tsc2046_config,
> },
> +#ifdef CONFIG_SPI_DEBUG
> + [1] = {
> + /* SPI test driver attached to SPI2 controller by
> + * default
> + */
> + .modalias = "spitst",
> + .bus_num = 2,
> + .chip_select = 0,
> + .max_speed_hz = 1500000,
> + .controller_data = &dummy_mcspi_config,
> + },
> +#endif
> };
>
> static struct platform_device sdp3430_lcd_device = {
> Index: linux-omap-2.6/arch/arm/mach-omap2/devices.c
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/mach-omap2/devices.c 2009-05-14
> 12:38:50.000000000 +0530
> +++ linux-omap-2.6/arch/arm/mach-omap2/devices.c 2009-05-15 16:53:38.000000000
> +0530
> @@ -257,8 +257,12 @@
> #define OMAP2_MCSPI3_BASE 0x480b8000
> #define OMAP2_MCSPI4_BASE 0x480ba000
>
> +#define OMAP2_MCSPI_MASTER 0
> +#define OMAP2_MCSPI_SLAVE 1
> +
If these are to be 'mode' flags for 'struct
omap2_mcspi_platform_config' then they should be part of mcspi.h, not
defined here.
> static struct omap2_mcspi_platform_config omap2_mcspi1_config = {
> .num_cs = 4,
> + .force_cs_mode = 1,
> };
>
> static struct resource omap2_mcspi1_resources[] = {
> @@ -281,6 +285,10 @@
>
> static struct omap2_mcspi_platform_config omap2_mcspi2_config = {
> .num_cs = 2,
> + .mode = OMAP2_MCSPI_MASTER,
> + .dma_mode = 1,
> + .force_cs_mode = 0,
> + .fifo_depth = 0,
Setting these init values to zero is redundant.
> };
>
> static struct resource omap2_mcspi2_resources[] = {
> @@ -351,6 +359,14 @@
>
> static void omap_init_mcspi(void)
> {
> +
> + if (cpu_is_omap3430()) {
> + omap_cfg_reg(AA3_3430_McSPI2_CLK);
> + omap_cfg_reg(Y2_3430_McSPI2_SIMO);
> + omap_cfg_reg(Y3_3430_McSPI2_SOMI);
> + omap_cfg_reg(Y4_3430_McSPI2_CS0);
> + }
> +
> platform_device_register(&omap2_mcspi1);
> platform_device_register(&omap2_mcspi2);
> #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP3)
> Index: linux-omap-2.6/arch/arm/mach-omap2/mux.c
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/mach-omap2/mux.c 2009-05-14 12:38:50.000000000
> +0530
> +++ linux-omap-2.6/arch/arm/mach-omap2/mux.c 2009-05-15 16:18:41.000000000 +0530
> @@ -486,6 +486,17 @@
> OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_OUTPUT)
> MUX_CFG_34XX("J25_34XX_GPIO170", 0x1c6,
> OMAP34XX_MUX_MODE4 | OMAP34XX_PIN_INPUT)
> +
> +/* McSPI */
> +MUX_CFG_34XX("AA3_3430_McSPI2_CLK", 0x1d6,
> + OMAP34XX_MUX_MODE0 | OMAP34XX_PIN_INPUT)
> +MUX_CFG_34XX("Y2_3430_McSPI2_SIMO", 0x1d8,
> + OMAP34XX_MUX_MODE0 | OMAP34XX_PIN_INPUT)
> +MUX_CFG_34XX("Y3_3430_McSPI2_SOMI", 0x1da,
> + OMAP34XX_MUX_MODE0 | OMAP34XX_PIN_INPUT)
> +MUX_CFG_34XX("Y4_3430_McSPI2_CS0", 0x1dc,
> + OMAP34XX_MUX_MODE0 | OMAP34XX_PIN_INPUT_PULLDOWN)
> +
> };
>
> #define OMAP34XX_PINS_SZ ARRAY_SIZE(omap34xx_pins)
> Index: linux-omap-2.6/arch/arm/plat-omap/include/mach/mcspi.h
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/plat-omap/include/mach/mcspi.h 2009-05-14
> 12:38:54.000000000 +0530
> +++ linux-omap-2.6/arch/arm/plat-omap/include/mach/mcspi.h 2009-05-14
> 19:48:35.000000000 +0530
> @@ -3,6 +3,19 @@
>
> struct omap2_mcspi_platform_config {
> unsigned short num_cs;
> +
> + /* SPI is master or slave */
> + unsigned short mode;
> +
> + /* Use only DMA for data transfers */
> + unsigned short dma_mode;
> +
> + /* Force chip select mode */
> + unsigned short force_cs_mode;
> +
> + /* FIFO depth in bytes, max value 64 */
> + unsigned short fifo_depth;
> +
> };
>
> struct omap2_mcspi_device_config {
> Index: linux-omap-2.6/arch/arm/plat-omap/include/mach/mux.h
> ===================================================================
> --- linux-omap-2.6.orig/arch/arm/plat-omap/include/mach/mux.h 2009-05-14
> 12:38:54.000000000 +0530
> +++ linux-omap-2.6/arch/arm/plat-omap/include/mach/mux.h 2009-05-15
> 16:22:28.000000000 +0530
> @@ -853,6 +853,13 @@
> AE5_34XX_GPIO143,
> H19_34XX_GPIO164_OUT,
> J25_34XX_GPIO170,
> +
> + /* McSPI */
> + AA3_3430_McSPI2_CLK,
> + Y2_3430_McSPI2_SIMO,
> + Y3_3430_McSPI2_SOMI,
> + Y4_3430_McSPI2_CS0,
> +
> };
>
> struct omap_mux_cfg {
> Index: linux-omap-2.6/drivers/spi/omap2_mcspi.c
> ===================================================================
> --- linux-omap-2.6.orig/drivers/spi/omap2_mcspi.c 2009-05-14 12:37:40.000000000
> +0530
> +++ linux-omap-2.6/drivers/spi/omap2_mcspi.c 2009-05-15 17:33:05.000000000 +0530
> @@ -37,9 +37,11 @@
>
> #include <mach/dma.h>
> #include <mach/clock.h>
> +#include <mach/mcspi.h>
>
>
> #define OMAP2_MCSPI_MAX_FREQ 48000000
> +#define OMAP2_MCSPI_MAX_FIFODEPTH 64
>
> #define OMAP2_MCSPI_REVISION 0x00
> #define OMAP2_MCSPI_SYSCONFIG 0x10
> @@ -49,6 +51,7 @@
> #define OMAP2_MCSPI_WAKEUPENABLE 0x20
> #define OMAP2_MCSPI_SYST 0x24
> #define OMAP2_MCSPI_MODULCTRL 0x28
> +#define OMAP2_MCSPI_XFERLEVEL 0x7c
>
> /* per-channel banks, 0x14 bytes each, first is: */
> #define OMAP2_MCSPI_CHCONF0 0x2c
> @@ -85,6 +88,9 @@
> #define OMAP2_MCSPI_CHCONF_IS BIT(18)
> #define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
> #define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
> +#define OMAP2_MCSPI_CHCONF_FFER BIT(28)
> +#define OMAP2_MCSPI_CHCONF_FFET BIT(27)
> +
>
> #define OMAP2_MCSPI_CHSTAT_RXS BIT(0)
> #define OMAP2_MCSPI_CHSTAT_TXS BIT(1)
> @@ -93,6 +99,10 @@
> #define OMAP2_MCSPI_CHCTRL_EN BIT(0)
>
> #define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
> +#define OMAP2_MCSPI_IRQ_EOW BIT(17)
> +
> +#define OMAP2_MCSPI_MODE_IS_MASTER 0
> +#define OMAP2_MCSPI_MODE_IS_SLAVE 1
This is the 2nd define of the master/slave mode flags. Pick a name
and define it once in mcspi.h.
> /* We have 2 DMA channels per CS, one for RX and one for TX */
> struct omap2_mcspi_dma {
> @@ -125,6 +135,10 @@
> unsigned long phys;
> /* SPI1 has 4 channels, while SPI2 has 2 */
> struct omap2_mcspi_dma *dma_channels;
> + unsigned short mcspi_mode;
> + unsigned short dma_mode;
> + unsigned short force_cs_mode;
> + unsigned short fifo_depth;
> };
>
> struct omap2_mcspi_cs {
> @@ -133,6 +147,37 @@
> int word_len;
> };
>
> +#ifdef CONFIG_SPI_DEBUG
> +struct reg_type {
> + char name[40];
> + int offset;
> +};
> +
> +static struct reg_type reg_map[] = {
> + {"MCSPI_REV", 0x0},
> + {"MCSPI_SYSCONFIG", 0x10},
> + {"MCSPI_SYSSTATUS", 0x14},
> + {"MCSPI_IRQSTATUS", 0x18},
> + {"MCSPI_IRQENABLE", 0x1C},
> + {"MCSPI_WAKEUPENABLE", 0x20},
> + {"MCSPI_SYST", 0x24},
> + {"MCSPI_MODULCTRL", 0x28},
> + {"MCSPI_XFERLEVEL", 0x7c},
> + {"CH0", 0x2C},
> + {"CH1", 0x40},
> + {"CH2", 0x54},
> + {"CH3", 0x68}
> +};
> +
> +static struct reg_type ch_reg_type[] = {
> + {"CONF", 0x00},
> + {"STAT", 0x04},
> + {"CTRL", 0x08},
> + {"TX", 0x0C},
> + {"RX", 0x10},
> +};
> +#endif
> +
> static struct workqueue_struct *omap2_mcspi_wq;
>
> #define MOD_REG_BIT(val, mask, set) do { \
> @@ -188,6 +233,44 @@
> mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l);
> }
>
> +#ifdef CONFIG_SPI_DEBUG
> +static int
> +omap2_mcspi_dump_regs(struct spi_master *master)
> +{
> + u32 spi_base;
> + u32 reg;
> + u32 bus;
> + u32 chan;
> + u32 channel;
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
> +
> + spi_base = mcspi->base;
> +
> + for (reg = 0; (reg < sizeof(reg_map) / sizeof(struct reg_type));
You could use ARRAY_SIZE() here.
> + reg++) {
> + struct reg_type *reg_d = ®_map[reg];
> + u32 base1 = spi_base + reg_d->offset;
> + if (reg_d->name[0] == 'C') {
> + for (channel = 0;
> + (channel < (sizeof(ch_reg_type) /
> + sizeof(struct reg_type)));
> + channel++) {
> + struct reg_type *reg_c = &ch_reg_type[channel];
> + u32 base2 = base1 + reg_c->offset;
> + printk(KERN_DEBUG "MCSPI_%s%s [0x%08X] = 0x%08X\n",
> + reg_d->name, reg_c->name, base2,
> + __raw_readl(base2));
Use pr_debug()
> + }
> + } else {
> + printk(KERN_DEBUG "%s : [0x%08X] = 0x%08X\n",
> + reg_d->name, base1, __raw_readl(base1));
ditto
> + }
> +
> + }
> + return 0;
> +}
> +#endif
> +
> static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
> {
> u32 l;
> @@ -205,34 +288,149 @@
> mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l);
> }
>
> +static int omap2_mcspi_set_txfifo(const struct spi_device *spi, int buf_size,
> + int enable)
> +{
> + u32 l, rw, s;
> + unsigned short revert = 0;
> + struct spi_master *master = spi->master;
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
> +
> + l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
> + s = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
> +
> + if (enable == 1) {
> + if (l & OMAP2_MCSPI_CHCONF_FFER)
> + return -1;
> +
> + if (s & OMAP2_MCSPI_CHCTRL_EN) {
> + omap2_mcspi_set_enable(spi, 0);
> + revert = 1;
> + }
> +
> + if (buf_size < mcspi->fifo_depth)
> + mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL,
> + ((buf_size << 16) |
> + (buf_size - 1) << 0));
> + else
> + mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL,
> + ((buf_size << 16) |
> + (mcspi->fifo_depth - 1) << 0));
> + }
> +
> + rw = OMAP2_MCSPI_CHCONF_FFET;
> + MOD_REG_BIT(l, rw, enable);
> + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l);
> +
> + if (revert)
> + omap2_mcspi_set_enable(spi, 1);
> +
> + return 0;
> +
> +}
> +
> +static int omap2_mcspi_set_rxfifo(const struct spi_device *spi, int buf_size,
> + int enable)
> +{
> + u32 l, rw, s;
> + unsigned short revert = 0;
> + struct spi_master *master = spi->master;
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
> +
> + l = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
> + s = mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
> +
> + if (enable == 1) {
> + if (l & OMAP2_MCSPI_CHCONF_FFET)
> + return -1;
> +
> + /* Channel needs to be disabled and enabled
> + * again for FIFO setting to take affect
> + */
> + if (s & OMAP2_MCSPI_CHCTRL_EN) {
> + omap2_mcspi_set_enable(spi, 0);
> + revert = 1;
> + }
> +
> + if (buf_size < mcspi->fifo_depth)
> + mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL,
> + ((buf_size << 16) |
> + (buf_size - 1) << 8));
> + else
> + mcspi_write_reg(master, OMAP2_MCSPI_XFERLEVEL,
> + ((buf_size << 16) |
> + (mcspi->fifo_depth - 1) << 8));
> + }
> +
> + rw = OMAP2_MCSPI_CHCONF_FFER;
> + MOD_REG_BIT(l, rw, enable);
> + mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, l);
> +
> + if (revert)
> + omap2_mcspi_set_enable(spi, 1);
> +
> + return 0;
> +
> +}
> +
> static void omap2_mcspi_set_master_mode(struct spi_master *master)
> {
> u32 l;
> + struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
>
> /* setup when switching from (reset default) slave mode
> - * to single-channel master mode
> + * to single-channel master mode based on config value
> */
> l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
> MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
> MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0);
> - MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
> +
> + if (mcspi->force_cs_mode)
> + MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
> +
> + mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
> +}
> +
> +static void omap2_mcspi_set_slave_mode(struct spi_master *master)
> +{
> + u32 l;
> +
> + l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
> + MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
> + MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 1);
> mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
> }
>
> +static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
> +{
> + unsigned long timeout;
> +
> + timeout = jiffies + msecs_to_jiffies(1000);
> + while (!(__raw_readl(reg) & bit)) {
> + if (time_after(jiffies, timeout))
> + return -1;
> + cpu_relax();
> + }
> + return 0;
> +}
> +
> static unsigned
> omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
> {
> struct omap2_mcspi *mcspi;
> struct omap2_mcspi_cs *cs = spi->controller_state;
> struct omap2_mcspi_dma *mcspi_dma;
> - unsigned int count, c;
> + unsigned int count, c, bytes_per_transfer;
> unsigned long base, tx_reg, rx_reg;
> - int word_len, data_type, element_count;
> - u8 * rx;
> - const u8 * tx;
> + int word_len, data_type, element_count, frame_count,
> + sync_type;
> + u8 *rx;
> + const u8 *tx;
> + void __iomem *irqstat_reg;
>
> mcspi = spi_master_get_devdata(spi->master);
> mcspi_dma = &mcspi->dma_channels[spi->chip_select];
> + irqstat_reg = mcspi->base + OMAP2_MCSPI_IRQSTATUS;
>
> count = xfer->len;
> c = count;
> @@ -247,19 +445,34 @@
> if (word_len <= 8) {
> data_type = OMAP_DMA_DATA_TYPE_S8;
> element_count = count;
> + bytes_per_transfer = 1;
> } else if (word_len <= 16) {
> data_type = OMAP_DMA_DATA_TYPE_S16;
> element_count = count >> 1;
> + bytes_per_transfer = 2;
> } else /* word_len <= 32 */ {
> data_type = OMAP_DMA_DATA_TYPE_S32;
> element_count = count >> 2;
> + bytes_per_transfer = 4;
> + }
> +
> + if ((mcspi->fifo_depth != 0) && (count > mcspi->fifo_depth)) {
> + sync_type = OMAP_DMA_SYNC_FRAME;
> + element_count = mcspi->fifo_depth/bytes_per_transfer;
> + frame_count = count/mcspi->fifo_depth;
> + } else if ((mcspi->fifo_depth != 0) && (count <= mcspi->fifo_depth)) {
> + sync_type = OMAP_DMA_SYNC_FRAME;
> + frame_count = 1;
> + } else {
> + sync_type = OMAP_DMA_SYNC_ELEMENT;
> + frame_count = 1;
> }
>
> if (tx != NULL) {
> +
> omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel,
> - data_type, element_count, 1,
> - OMAP_DMA_SYNC_ELEMENT,
> - mcspi_dma->dma_tx_sync_dev, 0);
> + data_type, element_count, frame_count,
> + sync_type, mcspi_dma->dma_tx_sync_dev, 0);
>
> omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0,
> OMAP_DMA_AMODE_CONSTANT,
> @@ -268,13 +481,16 @@
> omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0,
> OMAP_DMA_AMODE_POST_INC,
> xfer->tx_dma, 0, 0);
> +
> + if (mcspi->fifo_depth != 0)
> + omap2_mcspi_set_txfifo(spi, count, 1);
> }
>
> if (rx != NULL) {
> +
> omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
> - data_type, element_count, 1,
> - OMAP_DMA_SYNC_ELEMENT,
> - mcspi_dma->dma_rx_sync_dev, 1);
> + data_type, element_count, frame_count,
> + sync_type, mcspi_dma->dma_rx_sync_dev, 1);
>
> omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0,
> OMAP_DMA_AMODE_CONSTANT,
> @@ -283,6 +499,14 @@
> omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0,
> OMAP_DMA_AMODE_POST_INC,
> xfer->rx_dma, 0, 0);
> +
> + if (mcspi->fifo_depth != 0) {
> + omap2_mcspi_set_rxfifo(spi, count, 1);
> +
> + /* Dummy write required for RX only mode */
> + if (tx == NULL)
> + mcspi_write_cs_reg(spi, OMAP2_MCSPI_TX0, 0);
> + }
> }
>
> if (tx != NULL) {
> @@ -297,27 +521,35 @@
>
> if (tx != NULL) {
> wait_for_completion(&mcspi_dma->dma_tx_completion);
> +
> + if (mcspi->fifo_depth != 0) {
> + if (mcspi_wait_for_reg_bit(irqstat_reg,
> + OMAP2_MCSPI_IRQ_EOW) < 0)
> + dev_err(&spi->dev, "TXS timed out\n");
> +
> + mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS,
> + OMAP2_MCSPI_IRQ_EOW);
> +
> + omap2_mcspi_set_txfifo(spi, count, 0);
> + }
> +
> dma_unmap_single(NULL, xfer->tx_dma, count, DMA_TO_DEVICE);
> }
>
> if (rx != NULL) {
> wait_for_completion(&mcspi_dma->dma_rx_completion);
> - dma_unmap_single(NULL, xfer->rx_dma, count, DMA_FROM_DEVICE);
> - }
> - return count;
> -}
>
> -static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
> -{
> - unsigned long timeout;
> + if (mcspi->fifo_depth != 0) {
> + omap2_mcspi_set_rxfifo(spi, count, 0);
>
> - timeout = jiffies + msecs_to_jiffies(1000);
> - while (!(__raw_readl(reg) & bit)) {
> - if (time_after(jiffies, timeout))
> - return -1;
> - cpu_relax();
> + mcspi_write_reg(mcspi->master, OMAP2_MCSPI_IRQSTATUS,
> + OMAP2_MCSPI_IRQ_EOW);
> +
> + }
> +
> + dma_unmap_single(NULL, xfer->rx_dma, count, DMA_FROM_DEVICE);
> }
> - return 0;
> + return count;
> }
>
> static unsigned
> @@ -508,8 +740,14 @@
> /* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
> * REVISIT: this controller could support SPI_3WIRE mode.
> */
> - l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
> - l |= OMAP2_MCSPI_CHCONF_DPE0;
> + if (mcspi->mcspi_mode == OMAP2_MCSPI_MODE_IS_MASTER) {
> + l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
> + l |= OMAP2_MCSPI_CHCONF_DPE0;
> + } else {
> + l |= OMAP2_MCSPI_CHCONF_IS;
> + l |= OMAP2_MCSPI_CHCONF_DPE1;
> + l &= ~OMAP2_MCSPI_CHCONF_DPE0;
> + }
>
> /* wordlength */
> l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
> @@ -521,9 +759,11 @@
> else
> l &= ~OMAP2_MCSPI_CHCONF_EPOL;
>
> - /* set clock divisor */
> - l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
> - l |= div << 2;
> + if (mcspi->mcspi_mode == OMAP2_MCSPI_MODE_IS_MASTER) {
> + /* set clock divisor */
> + l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
> + l |= div << 2;
> + }
>
> /* set SPI mode 0..3 */
> if (spi->mode & SPI_CPOL)
> @@ -688,7 +928,7 @@
> clk_enable(mcspi->ick);
> clk_enable(mcspi->fck);
>
> - /* We only enable one channel at a time -- the one whose message is
> + /* only enable one channel at a time -- the one whose message is
Heh, are you against first person plural comments. ;)
> * at the head of the queue -- although this controller would gladly
> * arbitrate among multiple channels. This corresponds to "single
> * channel" master mode. As a side effect, we need to manage the
> @@ -728,7 +968,10 @@
> par_override = 0;
> }
>
> - if (!cs_active) {
> + if ((!cs_active) && (mcspi->force_cs_mode) &&
> + (mcspi->mcspi_mode ==
> + OMAP2_MCSPI_MODE_IS_MASTER)) {
> +
> omap2_mcspi_force_cs(spi, 1);
> cs_active = 1;
> }
> @@ -749,10 +992,14 @@
> __raw_writel(0, cs->base
> + OMAP2_MCSPI_TX0);
>
> - if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
> + if (m->is_dma_mapped ||
> + t->len >= DMA_MIN_BYTES ||
> + mcspi->dma_mode)
> +
> count = omap2_mcspi_txrx_dma(spi, t);
> else
> count = omap2_mcspi_txrx_pio(spi, t);
> +
> m->actual_length += count;
>
> if (count != t->len) {
> @@ -765,7 +1012,10 @@
> udelay(t->delay_usecs);
>
> /* ignore the "leave it on after last xfer" hint */
> - if (t->cs_change) {
> + if ((t->cs_change) && (mcspi->force_cs_mode) &&
> + (mcspi->mcspi_mode ==
> + OMAP2_MCSPI_MODE_IS_MASTER)) {
> +
> omap2_mcspi_force_cs(spi, 0);
> cs_active = 0;
> }
> @@ -777,8 +1027,9 @@
> status = omap2_mcspi_setup_transfer(spi, NULL);
> }
>
> - if (cs_active)
> - omap2_mcspi_force_cs(spi, 0);
> + if ((cs_active) && (mcspi->force_cs_mode) &&
> + (mcspi->mcspi_mode == OMAP2_MCSPI_MODE_IS_MASTER))
> + omap2_mcspi_force_cs(spi, 0);
>
> omap2_mcspi_set_enable(spi, 0);
>
> @@ -803,6 +1054,8 @@
> m->actual_length = 0;
> m->status = 0;
>
> + mcspi = spi_master_get_devdata(spi->master);
> +
> /* reject invalid messages and transfers */
> if (list_empty(&m->transfers) || !m->complete)
> return -EINVAL;
> @@ -831,7 +1084,14 @@
> return -EINVAL;
> }
>
> - if (m->is_dma_mapped || len < DMA_MIN_BYTES)
> + if (mcspi->fifo_depth != 0) {
> + if ((len % mcspi->fifo_depth) != 0)
> + return -EINVAL;
> + }
> +
> + /* Ignore DMA_MIN_BYTES check if dma only mode is set */
> + if (m->is_dma_mapped || ((len < DMA_MIN_BYTES) &&
> + (!mcspi->dma_mode)))
> continue;
>
> /* Do DMA mapping "early" for better error reporting and
> @@ -862,8 +1122,6 @@
> }
> }
>
> - mcspi = spi_master_get_devdata(spi->master);
> -
> spin_lock_irqsave(&mcspi->lock, flags);
> list_add_tail(&m->queue, &mcspi->msg_queue);
> queue_work(omap2_mcspi_wq, &mcspi->work);
> @@ -894,7 +1152,10 @@
> mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE,
> OMAP2_MCSPI_WAKEUPENABLE_WKEN);
>
> - omap2_mcspi_set_master_mode(master);
> + if (mcspi->mcspi_mode == OMAP2_MCSPI_MODE_IS_MASTER)
> + omap2_mcspi_set_master_mode(master);
> + else
> + omap2_mcspi_set_slave_mode(master);
>
> clk_disable(mcspi->fck);
> clk_disable(mcspi->ick);
> @@ -950,6 +1211,8 @@
> static int __init omap2_mcspi_probe(struct platform_device *pdev)
> {
> struct spi_master *master;
> + struct omap2_mcspi_platform_config *pdata =
> + (struct omap2_mcspi_platform_config *)pdev->dev.platform_data;
> struct omap2_mcspi *mcspi;
> struct resource *r;
> int status = 0, i;
> @@ -1003,6 +1266,16 @@
>
> mcspi = spi_master_get_devdata(master);
> mcspi->master = master;
> + mcspi->mcspi_mode = pdata->mode;
> + mcspi->dma_mode = pdata->dma_mode;
> + mcspi->force_cs_mode = pdata->force_cs_mode;
> +
> + if (pdata->fifo_depth <= OMAP2_MCSPI_MAX_FIFODEPTH)
> + mcspi->fifo_depth = pdata->fifo_depth;
> + else {
> + mcspi->fifo_depth = 0;
> + dev_dbg(&pdev->dev, "Invalid fifo depth specified\n");
Would seeting to MAX_FIFODEPTH be more appropriate here, along with
a warning.
> + }
>
> r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (r == NULL) {
Kevin
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