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author | 2017-05-23 14:38:27 +0200 | |
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committer | 2017-05-23 19:22:08 +0100 | |
commit | 09b3ed2d5916f270ffbc5d002a2196ededf5ec7e (patch) | |
tree | 05bd08bb1987aa92b84b49b9ee4eee0ba3b2917f /drivers/spi/spi-imx.c | |
parent | spi: imx: fix issue when tx_buf or rx_buf is NULL (diff) | |
download | linux-09b3ed2d5916f270ffbc5d002a2196ededf5ec7e.tar.gz linux-09b3ed2d5916f270ffbc5d002a2196ededf5ec7e.tar.bz2 linux-09b3ed2d5916f270ffbc5d002a2196ededf5ec7e.zip |
spi: imx: Revert "spi: imx: dynamic burst length adjust for PIO mode"
This reverts commits 8d4a6cad7adb3ddac32cd52635f20e11de11a658 and
179547e143e773f9f866ad3536275ab627711f3a.
Besides the problems already found with this patch it also modifies
the spi transfer tx_buf in spi_imx_u32_swap_u8() and spi_imx_u32_swap_u16().
This is hidden from the compiler with an explicit cast from const void*
to u32*, so no warning is issued.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-imx.c')
-rw-r--r-- | drivers/spi/spi-imx.c | 163 |
1 files changed, 8 insertions, 155 deletions
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 19b30cf7d2b7..b402530a7a9a 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -56,11 +56,9 @@ /* The maximum bytes that a sdma BD can transfer.*/ #define MAX_SDMA_BD_BYTES (1 << 15) -#define MX51_ECSPI_CTRL_MAX_BURST 512 struct spi_imx_config { unsigned int speed_hz; unsigned int bpw; - unsigned int len; }; enum spi_imx_devtype { @@ -99,14 +97,12 @@ struct spi_imx_data { unsigned int bytes_per_word; unsigned int spi_drctl; - unsigned int count, count_index; + unsigned int count; void (*tx)(struct spi_imx_data *); void (*rx)(struct spi_imx_data *); void *rx_buf; const void *tx_buf; unsigned int txfifo; /* number of words pushed in tx FIFO */ - unsigned int dynamic_burst, bpw_rx; - unsigned int bpw_w; /* DMA */ bool usedma; @@ -256,7 +252,6 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) #define MX51_ECSPI_CTRL_BL_OFFSET 20 -#define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20) #define MX51_ECSPI_CONFIG 0x0c #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0)) @@ -284,77 +279,6 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_TESTREG 0x20 #define MX51_ECSPI_TESTREG_LBC BIT(31) -static void spi_imx_u32_swap_u8(struct spi_transfer *transfer, u32 *buf) -{ - int i; - - if (!buf) - return; - - for (i = 0; i < transfer->len / 4; i++) - *(buf + i) = cpu_to_be32(*(buf + i)); -} - -static void spi_imx_u32_swap_u16(struct spi_transfer *transfer, u32 *buf) -{ - int i; - - if (!buf) - return; - - for (i = 0; i < transfer->len / 4; i++) { - u16 *temp = (u16 *)buf; - - *(temp + i * 2) = cpu_to_be16(*(temp + i * 2)); - *(temp + i * 2 + 1) = cpu_to_be16(*(temp + i * 2 + 1)); - - *(buf + i) = cpu_to_be32(*(buf + i)); - } -} - -static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx) -{ - if (!spi_imx->bpw_rx) { - spi_imx_buf_rx_u32(spi_imx); - return; - } - - if (spi_imx->bpw_w == 1) - spi_imx_buf_rx_u8(spi_imx); - else if (spi_imx->bpw_w == 2) - spi_imx_buf_rx_u16(spi_imx); -} - -static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx) -{ - u32 ctrl, val; - - if (spi_imx->count == spi_imx->count_index) { - spi_imx->count_index = spi_imx->count > sizeof(u32) ? - spi_imx->count % sizeof(u32) : 0; - ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); - ctrl &= ~MX51_ECSPI_CTRL_BL_MASK; - if (spi_imx->count >= sizeof(u32)) { - val = spi_imx->count - spi_imx->count_index; - } else { - val = spi_imx->bpw_w; - spi_imx->bpw_rx = 1; - } - ctrl |= ((val * 8 - 1) << MX51_ECSPI_CTRL_BL_OFFSET); - writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); - } - - if (spi_imx->count >= sizeof(u32)) { - spi_imx_buf_tx_u32(spi_imx); - return; - } - - if (spi_imx->bpw_w == 1) - spi_imx_buf_tx_u8(spi_imx); - else if (spi_imx->bpw_w == 2) - spi_imx_buf_tx_u16(spi_imx); -} - /* MX51 eCSPI */ static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx, unsigned int fspi, unsigned int *fres) @@ -446,15 +370,7 @@ static int mx51_ecspi_config(struct spi_device *spi, /* set chip select to use */ ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select); - if (spi_imx->dynamic_burst) { - if (config->len > MX51_ECSPI_CTRL_MAX_BURST) - ctrl |= MX51_ECSPI_CTRL_BL_MASK; - else - ctrl |= (((config->len - config->len % 4) * 8 - 1) << - MX51_ECSPI_CTRL_BL_OFFSET); - } else { - ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; - } + ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); @@ -889,8 +805,6 @@ static void spi_imx_push(struct spi_imx_data *spi_imx) while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) { if (!spi_imx->count) break; - if (spi_imx->txfifo && (spi_imx->count == spi_imx->count_index)) - break; spi_imx->tx(spi_imx); spi_imx->txfifo++; } @@ -981,12 +895,8 @@ static int spi_imx_setupxfer(struct spi_device *spi, struct spi_imx_config config; int ret; - spi_imx->dynamic_burst = 0; - spi_imx->bpw_rx = 0; - config.bpw = t ? t->bits_per_word : spi->bits_per_word; config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; - config.len = t->len; if (!config.speed_hz) config.speed_hz = spi->max_speed_hz; @@ -995,32 +905,14 @@ static int spi_imx_setupxfer(struct spi_device *spi, /* Initialize the functions for transfer */ if (config.bpw <= 8) { - if (t->len >= sizeof(u32) && is_imx51_ecspi(spi_imx)) { - spi_imx->dynamic_burst = 1; - spi_imx->rx = spi_imx_buf_rx_swap; - spi_imx->tx = spi_imx_buf_tx_swap; - } else { - spi_imx->rx = spi_imx_buf_rx_u8; - spi_imx->tx = spi_imx_buf_tx_u8; - } + spi_imx->rx = spi_imx_buf_rx_u8; + spi_imx->tx = spi_imx_buf_tx_u8; } else if (config.bpw <= 16) { - if (t->len >= sizeof(u32) && is_imx51_ecspi(spi_imx)) { - spi_imx->dynamic_burst = 1; - spi_imx->rx = spi_imx_buf_rx_swap; - spi_imx->tx = spi_imx_buf_tx_swap; - } else { - spi_imx->rx = spi_imx_buf_rx_u16; - spi_imx->tx = spi_imx_buf_tx_u16; - } + spi_imx->rx = spi_imx_buf_rx_u16; + spi_imx->tx = spi_imx_buf_tx_u16; } else { - if (is_imx51_ecspi(spi_imx)) { - spi_imx->dynamic_burst = 1; - spi_imx->rx = spi_imx_buf_rx_swap; - spi_imx->tx = spi_imx_buf_tx_swap; - } else { - spi_imx->rx = spi_imx_buf_rx_u32; - spi_imx->tx = spi_imx_buf_tx_u32; - } + spi_imx->rx = spi_imx_buf_rx_u32; + spi_imx->tx = spi_imx_buf_tx_u32; } if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t)) @@ -1028,8 +920,6 @@ static int spi_imx_setupxfer(struct spi_device *spi, else spi_imx->usedma = 0; - spi_imx->bpw_w = DIV_ROUND_UP(config.bpw, 8); - if (spi_imx->usedma) { ret = spi_imx_dma_configure(spi->master, spi_imx_bytes_per_word(config.bpw)); @@ -1204,27 +1094,6 @@ static int spi_imx_pio_transfer(struct spi_device *spi, spi_imx->count = transfer->len; spi_imx->txfifo = 0; - if (spi_imx->dynamic_burst) { - if (spi_imx->count > MX51_ECSPI_CTRL_MAX_BURST) - spi_imx->count_index = spi_imx->count % - MX51_ECSPI_CTRL_MAX_BURST; - else - spi_imx->count_index = spi_imx->count % sizeof(u32); - - switch (spi_imx->bpw_w) { - case 1: - spi_imx_u32_swap_u8(transfer, - (u32 *)transfer->tx_buf); - break; - case 2: - spi_imx_u32_swap_u16(transfer, - (u32 *)transfer->tx_buf); - break; - default: - break; - } - } - reinit_completion(&spi_imx->xfer_done); spi_imx_push(spi_imx); @@ -1241,22 +1110,6 @@ static int spi_imx_pio_transfer(struct spi_device *spi, return -ETIMEDOUT; } - if (spi_imx->dynamic_burst) { - switch (spi_imx->bpw_w) { - case 1: - spi_imx_u32_swap_u8(transfer, - (u32 *)transfer->rx_buf); - break; - case 2: - spi_imx_u32_swap_u16(transfer, - (u32 *)transfer->rx_buf); - break; - default: - break; - } - spi_imx->dynamic_burst = 0; - } - return transfer->len; } |