From 5bcc3b0bbee576acf91bed481549998851c5fe56 Mon Sep 17 00:00:00 2001 From: Qipan Li Date: Tue, 26 May 2015 05:21:34 +0000 Subject: spi: sirf: add the reset for USP-based SPI USP-based SPI need a disable and enable, otherwise it doesn't work. this patch adds it as HW initialization. Signed-off-by: Qipan Li Signed-off-by: Barry Song Signed-off-by: Mark Brown --- drivers/spi/spi-sirf.c | 70 ++++++++++++++++++++++++++++++-------------------- 1 file changed, 42 insertions(+), 28 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c index f9b864fb3cee..7072276ad354 100644 --- a/drivers/spi/spi-sirf.c +++ b/drivers/spi/spi-sirf.c @@ -248,34 +248,6 @@ static const struct sirf_spi_register usp_spi_register = { .usp_int_en_clr = 0x140, }; -struct sirf_spi_comp_data { - const struct sirf_spi_register *regs; - enum sirf_spi_type type; - unsigned int dat_max_frm_len; - unsigned int fifo_size; -}; - -static const struct sirf_spi_comp_data sirf_real_spi = { - .regs = &real_spi_register, - .type = SIRF_REAL_SPI, - .dat_max_frm_len = 64 * 1024, - .fifo_size = 256, -}; - -static const struct sirf_spi_comp_data sirf_usp_spi_p2 = { - .regs = &usp_spi_register, - .type = SIRF_USP_SPI_P2, - .dat_max_frm_len = 1024 * 1024, - .fifo_size = 128, -}; - -static const struct sirf_spi_comp_data sirf_usp_spi_a7 = { - .regs = &usp_spi_register, - .type = SIRF_USP_SPI_A7, - .dat_max_frm_len = 1024 * 1024, - .fifo_size = 512, -}; - struct sirfsoc_spi { struct spi_bitbang bitbang; struct completion rx_done; @@ -321,6 +293,23 @@ struct sirfsoc_spi { unsigned int dat_max_frm_len; }; +struct sirf_spi_comp_data { + const struct sirf_spi_register *regs; + enum sirf_spi_type type; + unsigned int dat_max_frm_len; + unsigned int fifo_size; + void (*hwinit)(struct sirfsoc_spi *sspi); +}; + +static void sirfsoc_usp_hwinit(struct sirfsoc_spi *sspi) +{ + /* reset USP and let USP can operate */ + writel(readl(sspi->base + sspi->regs->usp_mode1) & + ~SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1); + writel(readl(sspi->base + sspi->regs->usp_mode1) | + SIRFSOC_USP_EN, sspi->base + sspi->regs->usp_mode1); +} + static void spi_sirfsoc_rx_word_u8(struct sirfsoc_spi *sspi) { u32 data; @@ -1047,6 +1036,29 @@ static void spi_sirfsoc_cleanup(struct spi_device *spi) } } +static const struct sirf_spi_comp_data sirf_real_spi = { + .regs = &real_spi_register, + .type = SIRF_REAL_SPI, + .dat_max_frm_len = 64 * 1024, + .fifo_size = 256, +}; + +static const struct sirf_spi_comp_data sirf_usp_spi_p2 = { + .regs = &usp_spi_register, + .type = SIRF_USP_SPI_P2, + .dat_max_frm_len = 1024 * 1024, + .fifo_size = 128, + .hwinit = sirfsoc_usp_hwinit, +}; + +static const struct sirf_spi_comp_data sirf_usp_spi_a7 = { + .regs = &usp_spi_register, + .type = SIRF_USP_SPI_A7, + .dat_max_frm_len = 1024 * 1024, + .fifo_size = 512, + .hwinit = sirfsoc_usp_hwinit, +}; + static const struct of_device_id spi_sirfsoc_of_match[] = { { .compatible = "sirf,prima2-spi", .data = &sirf_real_spi}, { .compatible = "sirf,prima2-usp-spi", .data = &sirf_usp_spi_p2}, @@ -1136,6 +1148,8 @@ static int spi_sirfsoc_probe(struct platform_device *pdev) goto free_tx_dma; } clk_prepare_enable(sspi->clk); + if (spi_comp_data->hwinit) + spi_comp_data->hwinit(sspi); sspi->ctrl_freq = clk_get_rate(sspi->clk); init_completion(&sspi->rx_done); -- cgit v1.2.3