X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=cpu%2Fat32ap%2Fatmel_mci.c;h=f59dfb5995e1c7d3dfc6b987d586b93fb0aeba90;hb=10212a0f11dc3b63cc8960c62ea91b519cb4793f;hp=9f62c0f14b8f665ca1edb9a415b01b36169a8ce6;hpb=f0da1d1b3c0719ea3b6025fe87b66224a466100d;p=u-boot

diff --git a/cpu/at32ap/atmel_mci.c b/cpu/at32ap/atmel_mci.c
index 9f62c0f14b..f59dfb5995 100644
--- a/cpu/at32ap/atmel_mci.c
+++ b/cpu/at32ap/atmel_mci.c
@@ -56,6 +56,7 @@
 #define MMC_DEFAULT_RCA		1
 
 static unsigned int mmc_rca;
+static int mmc_card_is_sd;
 static block_dev_desc_t mmc_blkdev;
 
 block_dev_desc_t *mmc_get_dev(int dev)
@@ -82,7 +83,9 @@ static void mci_set_mode(unsigned long hz, unsigned long blklen)
 
 	blklen &= 0xfffc;
 	mmci_writel(MR, (MMCI_BF(CLKDIV, clkdiv)
-			 | MMCI_BF(BLKLEN, blklen)));
+			 | MMCI_BF(BLKLEN, blklen)
+			 | MMCI_BIT(RDPROOF)
+			 | MMCI_BIT(WRPROOF)));
 }
 
 #define RESP_NO_CRC	1
@@ -195,11 +198,11 @@ mmc_bread(int dev, unsigned long start, lbaint_t blkcnt,
 
 	/* Put the device into Transfer state */
 	ret = mmc_cmd(MMC_CMD_SELECT_CARD, mmc_rca << 16, resp, R1 | NCR);
-	if (ret) goto fail;
+	if (ret) goto out;
 
 	/* Set block length */
 	ret = mmc_cmd(MMC_CMD_SET_BLOCKLEN, mmc_blkdev.blksz, resp, R1 | NCR);
-	if (ret) goto fail;
+	if (ret) goto out;
 
 	pr_debug("MCI_DTOR = %08lx\n", mmci_readl(DTOR));
 
@@ -208,7 +211,7 @@ mmc_bread(int dev, unsigned long start, lbaint_t blkcnt,
 			      start * mmc_blkdev.blksz, resp,
 			      (R1 | NCR | TRCMD_START | TRDIR_READ
 			       | TRTYP_BLOCK));
-		if (ret) goto fail;
+		if (ret) goto out;
 
 		ret = -EIO;
 		wordcount = 0;
@@ -216,7 +219,7 @@ mmc_bread(int dev, unsigned long start, lbaint_t blkcnt,
 			do {
 				status = mmci_readl(SR);
 				if (status & (ERROR_FLAGS | MMCI_BIT(OVRE)))
-					goto fail;
+					goto read_error;
 			} while (!(status & MMCI_BIT(RXRDY)));
 
 			if (status & MMCI_BIT(RXRDY)) {
@@ -225,7 +228,7 @@ mmc_bread(int dev, unsigned long start, lbaint_t blkcnt,
 				*buffer++ = data;
 				wordcount++;
 			}
-		} while(wordcount < (512 / 4));
+		} while(wordcount < (mmc_blkdev.blksz / 4));
 
 		pr_debug("mmc: read %u words, waiting for BLKE\n", wordcount);
 
@@ -241,9 +244,10 @@ out:
 	mmc_cmd(MMC_CMD_SELECT_CARD, 0, resp, NCR);
 	return i;
 
-fail:
+read_error:
 	mmc_cmd(MMC_CMD_SEND_STATUS, mmc_rca << 16, &card_status, R1 | NCR);
-	printf("mmc: bread failed, card status = ", card_status);
+	printf("mmc: bread failed, status = %08x, card status = %08x\n",
+	       status, card_status);
 	goto out;
 }
 
@@ -371,6 +375,7 @@ static int sd_init_card(struct mmc_cid *cid, int verbose)
 	mmc_rca = resp[0] >> 16;
 	if (verbose)
 		printf("SD Card detected (RCA %u)\n", mmc_rca);
+	mmc_card_is_sd = 1;
 	return 0;
 }
 
@@ -405,10 +410,64 @@ static int mmc_init_card(struct mmc_cid *cid, int verbose)
 	return ret;
 }
 
+static void mci_set_data_timeout(struct mmc_csd *csd)
+{
+	static const unsigned int dtomul_to_shift[] = {
+		0, 4, 7, 8, 10, 12, 16, 20,
+	};
+	static const unsigned int taac_exp[] = {
+		1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
+	};
+	static const unsigned int taac_mant[] = {
+		0,  10, 12, 13, 15, 60, 25, 30,
+		35, 40, 45, 50, 55, 60, 70, 80,
+	};
+	unsigned int timeout_ns, timeout_clks;
+	unsigned int e, m;
+	unsigned int dtocyc, dtomul;
+	unsigned int shift;
+	u32 dtor;
+
+	e = csd->taac & 0x07;
+	m = (csd->taac >> 3) & 0x0f;
+
+	timeout_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
+	timeout_clks = csd->nsac * 100;
+
+	timeout_clks += (((timeout_ns + 9) / 10)
+			 * ((CFG_MMC_CLK_PP + 99999) / 100000) + 9999) / 10000;
+	if (!mmc_card_is_sd)
+		timeout_clks *= 10;
+	else
+		timeout_clks *= 100;
+
+	dtocyc = timeout_clks;
+	dtomul = 0;
+	while (dtocyc > 15 && dtomul < 8) {
+		dtomul++;
+		shift = dtomul_to_shift[dtomul];
+		dtocyc = (timeout_clks + (1 << shift) - 1) >> shift;
+	}
+
+	if (dtomul >= 8) {
+		dtomul = 7;
+		dtocyc = 15;
+		puts("Warning: Using maximum data timeout\n");
+	}
+
+	dtor = (MMCI_BF(DTOMUL, dtomul)
+		| MMCI_BF(DTOCYC, dtocyc));
+	mmci_writel(DTOR, dtor);
+
+	printf("mmc: Using %u cycles data timeout (DTOR=0x%x)\n",
+	       dtocyc << shift, dtor);
+}
+
 int mmc_init(int verbose)
 {
 	struct mmc_cid cid;
 	struct mmc_csd csd;
+	unsigned int max_blksz;
 	int ret;
 
 	/* Initialize controller */
@@ -418,6 +477,8 @@ int mmc_init(int verbose)
 	mmci_writel(IDR, ~0UL);
 	mci_set_mode(CFG_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
 
+	mmc_card_is_sd = 0;
+
 	ret = sd_init_card(&cid, verbose);
 	if (ret) {
 		mmc_rca = MMC_DEFAULT_RCA;
@@ -433,6 +494,8 @@ int mmc_init(int verbose)
 	if (verbose)
 		mmc_dump_csd(&csd);
 
+	mci_set_data_timeout(&csd);
+
 	/* Initialize the blockdev structure */
 	mmc_blkdev.if_type = IF_TYPE_MMC;
 	mmc_blkdev.part_type = PART_TYPE_DOS;
@@ -444,7 +507,17 @@ int mmc_init(int verbose)
 		sizeof(mmc_blkdev.product));
 	sprintf((char *)mmc_blkdev.revision, "%x %x",
 		cid.prv >> 4, cid.prv & 0x0f);
-	mmc_blkdev.blksz = 1 << csd.read_bl_len;
+
+	/*
+	 * If we can't use 512 byte blocks, refuse to deal with the
+	 * card. Tons of code elsewhere seems to depend on this.
+	 */
+	max_blksz = 1 << csd.read_bl_len;
+	if (max_blksz < 512 || (max_blksz > 512 && !csd.read_bl_partial)) {
+		printf("Card does not support 512 byte reads, aborting.\n");
+		return -ENODEV;
+	}
+	mmc_blkdev.blksz = 512;
 	mmc_blkdev.lba = (csd.c_size + 1) * (1 << (csd.c_size_mult + 2));
 
 	mci_set_mode(CFG_MMC_CLK_PP, mmc_blkdev.blksz);