diff options
| author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2015-01-13 08:00:07 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-01-20 12:23:47 +0300 |
| commit | f45394d5ecd1cf3644a6f1ce7db39ab406ced0a6 (patch) | |
| tree | 0e20060333b96a05fa7066531e4c797717b572d7 /drivers/mmc/host/sh_mobile_sdhi.c | |
| parent | 0c47f6aebaba68517692863cbdd88e98e2574b1a (diff) | |
| download | linux-f45394d5ecd1cf3644a6f1ce7db39ab406ced0a6.tar.xz | |
mmc: sh_mobile_sdhi: enable 32bit DMA access
Now, sh_mobile_sdhi can use 32bit DMA access in R-Cer Gen2.
Let's use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/sh_mobile_sdhi.c')
| -rw-r--r-- | drivers/mmc/host/sh_mobile_sdhi.c | 42 |
1 files changed, 33 insertions, 9 deletions
diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c index 40913299f3ba..7dbcb577f596 100644 --- a/drivers/mmc/host/sh_mobile_sdhi.c +++ b/drivers/mmc/host/sh_mobile_sdhi.c @@ -41,6 +41,7 @@ struct sh_mobile_sdhi_of_data { unsigned long tmio_flags; unsigned long capabilities; unsigned long capabilities2; + enum dma_slave_buswidth dma_buswidth; dma_addr_t dma_rx_offset; }; @@ -60,6 +61,7 @@ static const struct sh_mobile_sdhi_of_data of_rcar_gen2_compatible = { .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE | TMIO_MMC_CLK_ACTUAL, .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ, + .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES, .dma_rx_offset = 0x2000, }; @@ -86,6 +88,29 @@ struct sh_mobile_sdhi { struct tmio_mmc_dma dma_priv; }; +static void sh_mobile_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width) +{ + u32 val; + + /* + * see also + * sh_mobile_sdhi_of_data :: dma_buswidth + */ + switch (sd_ctrl_read16(host, CTL_VERSION)) { + case 0x490C: + val = (width == 32) ? 0x0001 : 0x0000; + break; + case 0xCB0D: + val = (width == 32) ? 0x0000 : 0x0001; + break; + default: + /* nothing to do */ + return; + } + + sd_ctrl_write16(host, EXT_ACC, val); +} + static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f) { struct mmc_host *mmc = platform_get_drvdata(pdev); @@ -96,6 +121,10 @@ static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int return ret; *f = clk_get_rate(priv->clk); + + /* enable 16bit data access on SDBUF as default */ + sh_mobile_sdhi_sdbuf_width(host, 16); + return 0; } @@ -161,6 +190,9 @@ static int sh_mobile_sdhi_multi_io_quirk(struct mmc_card *card, static void sh_mobile_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable) { sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0); + + /* enable 32bit access if DMA mode if possibile */ + sh_mobile_sdhi_sdbuf_width(host, enable ? 32 : 16); } static int sh_mobile_sdhi_probe(struct platform_device *pdev) @@ -175,7 +207,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) int irq, ret, i = 0; bool multiplexed_isr = true; struct tmio_mmc_dma *dma_priv; - u16 ver; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) @@ -271,6 +302,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) mmc_data->capabilities |= of_data->capabilities; mmc_data->capabilities2 |= of_data->capabilities2; mmc_data->dma_rx_offset = of_data->dma_rx_offset; + dma_priv->dma_buswidth = of_data->dma_buswidth; } ret = tmio_mmc_host_probe(host, mmc_data); @@ -278,14 +310,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev) goto efree; /* - * FIXME: - * this Workaround can be more clever method - */ - ver = sd_ctrl_read16(host, CTL_VERSION); - if (ver == 0xCB0D) - sd_ctrl_write16(host, EXT_ACC, 1); - - /* * Allow one or more specific (named) ISRs or * one or more multiplexed (un-named) ISRs. */ |