X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fmmc%2Fhost%2Fpxamci.c;h=1654a3330340a2bfdfb1fd740d15ed4af0e76f95;hb=64c911a3f7c9864a4bbddbb77b722d5553ddcd32;hp=91e25683b3975d630852acd36d1445c65a478b87;hpb=5d3ad4e8a12e538eead0a37d22b1ba6aec0f2127;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 91e25683b39..1654a333034 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -23,11 +23,12 @@
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/mmc/host.h>
 
 #include <asm/dma.h>
 #include <asm/io.h>
-#include <asm/scatterlist.h>
 #include <asm/sizes.h>
 
 #include <asm/arch/pxa-regs.h>
@@ -38,12 +39,15 @@
 #define DRIVER_NAME	"pxa2xx-mci"
 
 #define NR_SG	1
+#define CLKRT_OFF	(~0)
 
 struct pxamci_host {
 	struct mmc_host		*mmc;
 	spinlock_t		lock;
 	struct resource		*res;
 	void __iomem		*base;
+	struct clk		*clk;
+	unsigned long		clkrate;
 	int			irq;
 	int			dma;
 	unsigned int		clkrt;
@@ -119,7 +123,7 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 	writel(nob, host->base + MMC_NOB);
 	writel(data->blksz, host->base + MMC_BLKLEN);
 
-	clks = (unsigned long long)data->timeout_ns * CLOCKRATE;
+	clks = (unsigned long long)data->timeout_ns * host->clkrate;
 	do_div(clks, 1000000000UL);
 	timeout = (unsigned int)clks + (data->timeout_clks << host->clkrt);
 	writel((timeout + 255) / 256, host->base + MMC_RDTO);
@@ -142,6 +146,10 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 				   host->dma_dir);
 
 	for (i = 0; i < host->dma_len; i++) {
+		unsigned int length = sg_dma_len(&data->sg[i]);
+		host->sg_cpu[i].dcmd = dcmd | length;
+		if (length & 31 && !(data->flags & MMC_DATA_READ))
+			host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
 		if (data->flags & MMC_DATA_READ) {
 			host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
 			host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
@@ -149,7 +157,6 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
 			host->sg_cpu[i].dsadr = sg_dma_address(&data->sg[i]);
 			host->sg_cpu[i].dtadr = host->res->start + MMC_TXFIFO;
 		}
-		host->sg_cpu[i].dcmd = dcmd | sg_dma_len(&data->sg[i]);
 		host->sg_cpu[i].ddadr = host->sg_dma + (i + 1) *
 					sizeof(struct pxa_dma_desc);
 	}
@@ -362,18 +369,30 @@ static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	struct pxamci_host *host = mmc_priv(mmc);
 
 	if (ios->clock) {
-		unsigned int clk = CLOCKRATE / ios->clock;
-		if (CLOCKRATE / clk > ios->clock)
+		unsigned long rate = host->clkrate;
+		unsigned int clk = rate / ios->clock;
+
+		if (host->clkrt == CLKRT_OFF)
+			clk_enable(host->clk);
+
+		/*
+		 * clk might result in a lower divisor than we
+		 * desire.  check for that condition and adjust
+		 * as appropriate.
+		 */
+		if (rate / clk > ios->clock)
 			clk <<= 1;
 		host->clkrt = fls(clk) - 1;
-		pxa_set_cken(CKEN_MMC, 1);
 
 		/*
 		 * we write clkrt on the next command
 		 */
 	} else {
 		pxamci_stop_clock(host);
-		pxa_set_cken(CKEN_MMC, 0);
+		if (host->clkrt != CLKRT_OFF) {
+			host->clkrt = CLKRT_OFF;
+			clk_disable(host->clk);
+		}
 	}
 
 	if (host->power_mode != ios->power_mode) {
@@ -414,8 +433,18 @@ static const struct mmc_host_ops pxamci_ops = {
 
 static void pxamci_dma_irq(int dma, void *devid)
 {
-	printk(KERN_ERR "DMA%d: IRQ???\n", dma);
-	DCSR(dma) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
+	struct pxamci_host *host = devid;
+	int dcsr = DCSR(dma);
+	DCSR(dma) = dcsr & ~DCSR_STOPIRQEN;
+
+	if (dcsr & DCSR_ENDINTR) {
+		writel(BUF_PART_FULL, host->base + MMC_PRTBUF);
+	} else {
+		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
+		       mmc_hostname(host->mmc), dma, dcsr);
+		host->data->error = -EIO;
+		pxamci_data_done(host, 0);
+	}
 }
 
 static irqreturn_t pxamci_detect_irq(int irq, void *devid)
@@ -449,8 +478,6 @@ static int pxamci_probe(struct platform_device *pdev)
 	}
 
 	mmc->ops = &pxamci_ops;
-	mmc->f_min = CLOCKRATE_MIN;
-	mmc->f_max = CLOCKRATE_MAX;
 
 	/*
 	 * We can do SG-DMA, but we don't because we never know how much
@@ -477,6 +504,23 @@ static int pxamci_probe(struct platform_device *pdev)
 	host->mmc = mmc;
 	host->dma = -1;
 	host->pdata = pdev->dev.platform_data;
+	host->clkrt = CLKRT_OFF;
+
+	host->clk = clk_get(&pdev->dev, "MMCCLK");
+	if (IS_ERR(host->clk)) {
+		ret = PTR_ERR(host->clk);
+		host->clk = NULL;
+		goto out;
+	}
+
+	host->clkrate = clk_get_rate(host->clk);
+
+	/*
+	 * Calculate minimum clock rate, rounding up.
+	 */
+	mmc->f_min = (host->clkrate + 63) / 64;
+	mmc->f_max = host->clkrate;
+
 	mmc->ocr_avail = host->pdata ?
 			 host->pdata->ocr_mask :
 			 MMC_VDD_32_33|MMC_VDD_33_34;
@@ -541,6 +585,8 @@ static int pxamci_probe(struct platform_device *pdev)
 			iounmap(host->base);
 		if (host->sg_cpu)
 			dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
+		if (host->clk)
+			clk_put(host->clk);
 	}
 	if (mmc)
 		mmc_free_host(mmc);
@@ -575,6 +621,8 @@ static int pxamci_remove(struct platform_device *pdev)
 		iounmap(host->base);
 		dma_free_coherent(&pdev->dev, PAGE_SIZE, host->sg_cpu, host->sg_dma);
 
+		clk_put(host->clk);
+
 		release_resource(host->res);
 
 		mmc_free_host(mmc);