staging: mt7621-mmc: Refactor dma setup process
Current code uses two functions for dma setup, msdc_dma_config and msdc_dma_setup. By now msdc_dma_setup is nearly empty and mainly calls msdc_dma_config, so the later one can be inline into the first one. While doing this there is also some refactoring done. Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1030,18 +1030,24 @@ static u8 msdc_dma_calcs(u8 *buf, u32 len)
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return 0xFF - (u8)sum;
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}
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/* gpd bd setup + dma registers */
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static void msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
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static void msdc_dma_setup(struct msdc_host *host, struct msdc_dma *dma,
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struct scatterlist *sg_cmd, unsigned int sglen)
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{
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void __iomem *base = host->base;
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//u32 i, j, num, bdlen, arg, xfersz;
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u32 j, num;
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struct scatterlist *sg;
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struct gpd *gpd;
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struct bd *bd;
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u32 j, num;
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BUG_ON(sglen > MAX_BD_NUM); /* not support currently */
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dma->sg = sg_cmd;
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dma->sglen = sglen;
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N_MSG(DMA, "DMA sglen<%d> xfersz<%d>", sglen, host->xfer_size);
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/* calculate the required number of gpd */
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num = (dma->sglen + MAX_BD_PER_GPD - 1) / MAX_BD_PER_GPD;
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num = (sglen + MAX_BD_PER_GPD - 1) / MAX_BD_PER_GPD;
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BUG_ON(num != 1);
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gpd = dma->gpd;
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@ -1055,13 +1061,13 @@ static void msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
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gpd->chksum = msdc_dma_calcs((u8 *)gpd, 16);
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/* modify bd*/
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for_each_sg(dma->sg, sg, dma->sglen, j) {
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for_each_sg(sg_cmd, sg, sglen, j) {
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bd[j].blkpad = 0;
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bd[j].dwpad = 0;
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bd[j].ptr = (void *)sg_dma_address(sg);
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bd[j].buflen = sg_dma_len(sg);
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if (j == dma->sglen - 1)
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if (j == sglen - 1)
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bd[j].eol = 1; /* the last bd */
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else
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bd[j].eol = 0;
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@ -1080,20 +1086,6 @@ static void msdc_dma_config(struct msdc_host *host, struct msdc_dma *dma)
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N_MSG(DMA, "DMA_CTRL = 0x%x", readl(MSDC_DMA_CTRL));
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N_MSG(DMA, "DMA_CFG = 0x%x", readl(MSDC_DMA_CFG));
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N_MSG(DMA, "DMA_SA = 0x%x", readl(MSDC_DMA_SA));
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}
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static void msdc_dma_setup(struct msdc_host *host, struct msdc_dma *dma,
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struct scatterlist *sg, unsigned int sglen)
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{
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BUG_ON(sglen > MAX_BD_NUM); /* not support currently */
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dma->sg = sg;
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dma->sglen = sglen;
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N_MSG(DMA, "DMA sglen<%d> xfersz<%d>", dma->sglen, host->xfer_size);
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msdc_dma_config(host, dma);
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}
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static int msdc_do_request(struct mmc_host *mmc, struct mmc_request *mrq)
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