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-rw-r--r--cpu/at32ap/atmel_mci.c477
1 files changed, 477 insertions, 0 deletions
diff --git a/cpu/at32ap/atmel_mci.c b/cpu/at32ap/atmel_mci.c
new file mode 100644
index 0000000..9f62c0f
--- /dev/null
+++ b/cpu/at32ap/atmel_mci.c
@@ -0,0 +1,477 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+
+#ifdef CONFIG_MMC
+
+#include <part.h>
+#include <mmc.h>
+
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/byteorder.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/memory-map.h>
+
+#include "atmel_mci.h"
+
+#ifdef DEBUG
+#define pr_debug(fmt, args...) printf(fmt, ##args)
+#else
+#define pr_debug(...) do { } while(0)
+#endif
+
+#ifndef CFG_MMC_CLK_OD
+#define CFG_MMC_CLK_OD 150000
+#endif
+
+#ifndef CFG_MMC_CLK_PP
+#define CFG_MMC_CLK_PP 5000000
+#endif
+
+#ifndef CFG_MMC_OP_COND
+#define CFG_MMC_OP_COND 0x00100000
+#endif
+
+#define MMC_DEFAULT_BLKLEN 512
+#define MMC_DEFAULT_RCA 1
+
+static unsigned int mmc_rca;
+static block_dev_desc_t mmc_blkdev;
+
+block_dev_desc_t *mmc_get_dev(int dev)
+{
+ return &mmc_blkdev;
+}
+
+static void mci_set_mode(unsigned long hz, unsigned long blklen)
+{
+ unsigned long bus_hz;
+ unsigned long clkdiv;
+
+ bus_hz = get_mci_clk_rate();
+ clkdiv = (bus_hz / hz) / 2 - 1;
+
+ pr_debug("mmc: setting clock %lu Hz, block size %lu\n",
+ hz, blklen);
+
+ if (clkdiv & ~255UL) {
+ clkdiv = 255;
+ printf("mmc: clock %lu too low; setting CLKDIV to 255\n",
+ hz);
+ }
+
+ blklen &= 0xfffc;
+ mmci_writel(MR, (MMCI_BF(CLKDIV, clkdiv)
+ | MMCI_BF(BLKLEN, blklen)));
+}
+
+#define RESP_NO_CRC 1
+#define R1 MMCI_BF(RSPTYP, 1)
+#define R2 MMCI_BF(RSPTYP, 2)
+#define R3 (R1 | RESP_NO_CRC)
+#define R6 R1
+#define NID MMCI_BF(MAXLAT, 0)
+#define NCR MMCI_BF(MAXLAT, 1)
+#define TRCMD_START MMCI_BF(TRCMD, 1)
+#define TRDIR_READ MMCI_BF(TRDIR, 1)
+#define TRTYP_BLOCK MMCI_BF(TRTYP, 0)
+#define INIT_CMD MMCI_BF(SPCMD, 1)
+#define OPEN_DRAIN MMCI_BF(OPDCMD, 1)
+
+#define ERROR_FLAGS (MMCI_BIT(DTOE) \
+ | MMCI_BIT(RDIRE) \
+ | MMCI_BIT(RENDE) \
+ | MMCI_BIT(RINDE) \
+ | MMCI_BIT(RTOE))
+
+static int
+mmc_cmd(unsigned long cmd, unsigned long arg,
+ void *resp, unsigned long flags)
+{
+ unsigned long *response = resp;
+ int i, response_words = 0;
+ unsigned long error_flags;
+ u32 status;
+
+ pr_debug("mmc: CMD%lu 0x%lx (flags 0x%lx)\n",
+ cmd, arg, flags);
+
+ error_flags = ERROR_FLAGS;
+ if (!(flags & RESP_NO_CRC))
+ error_flags |= MMCI_BIT(RCRCE);
+
+ flags &= ~MMCI_BF(CMDNB, ~0UL);
+
+ if (MMCI_BFEXT(RSPTYP, flags) == MMCI_RSPTYP_48_BIT_RESP)
+ response_words = 1;
+ else if (MMCI_BFEXT(RSPTYP, flags) == MMCI_RSPTYP_136_BIT_RESP)
+ response_words = 4;
+
+ mmci_writel(ARGR, arg);
+ mmci_writel(CMDR, cmd | flags);
+ do {
+ udelay(40);
+ status = mmci_readl(SR);
+ } while (!(status & MMCI_BIT(CMDRDY)));
+
+ pr_debug("mmc: status 0x%08lx\n", status);
+
+ if (status & ERROR_FLAGS) {
+ printf("mmc: command %lu failed (status: 0x%08lx)\n",
+ cmd, status);
+ return -EIO;
+ }
+
+ if (response_words)
+ pr_debug("mmc: response:");
+
+ for (i = 0; i < response_words; i++) {
+ response[i] = mmci_readl(RSPR);
+ pr_debug(" %08lx", response[i]);
+ }
+ pr_debug("\n");
+
+ return 0;
+}
+
+static int mmc_acmd(unsigned long cmd, unsigned long arg,
+ void *resp, unsigned long flags)
+{
+ unsigned long aresp[4];
+ int ret;
+
+ /*
+ * Seems like the APP_CMD part of an ACMD has 64 cycles max
+ * latency even though the ACMD part doesn't. This isn't
+ * entirely clear in the SD Card spec, but some cards refuse
+ * to work if we attempt to use 5 cycles max latency here...
+ */
+ ret = mmc_cmd(MMC_CMD_APP_CMD, 0, aresp,
+ R1 | NCR | (flags & OPEN_DRAIN));
+ if (ret)
+ return ret;
+ if ((aresp[0] & (R1_ILLEGAL_COMMAND | R1_APP_CMD)) != R1_APP_CMD)
+ return -ENODEV;
+
+ ret = mmc_cmd(cmd, arg, resp, flags);
+ return ret;
+}
+
+static unsigned long
+mmc_bread(int dev, unsigned long start, lbaint_t blkcnt,
+ unsigned long *buffer)
+{
+ int ret, i = 0;
+ unsigned long resp[4];
+ unsigned long card_status, data;
+ unsigned long wordcount;
+ u32 status;
+
+ if (blkcnt == 0)
+ return 0;
+
+ pr_debug("mmc_bread: dev %d, start %lx, blkcnt %lx\n",
+ dev, start, blkcnt);
+
+ /* Put the device into Transfer state */
+ ret = mmc_cmd(MMC_CMD_SELECT_CARD, mmc_rca << 16, resp, R1 | NCR);
+ if (ret) goto fail;
+
+ /* Set block length */
+ ret = mmc_cmd(MMC_CMD_SET_BLOCKLEN, mmc_blkdev.blksz, resp, R1 | NCR);
+ if (ret) goto fail;
+
+ pr_debug("MCI_DTOR = %08lx\n", mmci_readl(DTOR));
+
+ for (i = 0; i < blkcnt; i++, start++) {
+ ret = mmc_cmd(MMC_CMD_READ_SINGLE_BLOCK,
+ start * mmc_blkdev.blksz, resp,
+ (R1 | NCR | TRCMD_START | TRDIR_READ
+ | TRTYP_BLOCK));
+ if (ret) goto fail;
+
+ ret = -EIO;
+ wordcount = 0;
+ do {
+ do {
+ status = mmci_readl(SR);
+ if (status & (ERROR_FLAGS | MMCI_BIT(OVRE)))
+ goto fail;
+ } while (!(status & MMCI_BIT(RXRDY)));
+
+ if (status & MMCI_BIT(RXRDY)) {
+ data = mmci_readl(RDR);
+ /* pr_debug("%x\n", data); */
+ *buffer++ = data;
+ wordcount++;
+ }
+ } while(wordcount < (512 / 4));
+
+ pr_debug("mmc: read %u words, waiting for BLKE\n", wordcount);
+
+ do {
+ status = mmci_readl(SR);
+ } while (!(status & MMCI_BIT(BLKE)));
+
+ putc('.');
+ }
+
+out:
+ /* Put the device back into Standby state */
+ mmc_cmd(MMC_CMD_SELECT_CARD, 0, resp, NCR);
+ return i;
+
+fail:
+ mmc_cmd(MMC_CMD_SEND_STATUS, mmc_rca << 16, &card_status, R1 | NCR);
+ printf("mmc: bread failed, card status = ", card_status);
+ goto out;
+}
+
+static void mmc_parse_cid(struct mmc_cid *cid, unsigned long *resp)
+{
+ cid->mid = resp[0] >> 24;
+ cid->oid = (resp[0] >> 8) & 0xffff;
+ cid->pnm[0] = resp[0];
+ cid->pnm[1] = resp[1] >> 24;
+ cid->pnm[2] = resp[1] >> 16;
+ cid->pnm[3] = resp[1] >> 8;
+ cid->pnm[4] = resp[1];
+ cid->pnm[5] = resp[2] >> 24;
+ cid->pnm[6] = 0;
+ cid->prv = resp[2] >> 16;
+ cid->psn = (resp[2] << 16) | (resp[3] >> 16);
+ cid->mdt = resp[3] >> 8;
+}
+
+static void sd_parse_cid(struct mmc_cid *cid, unsigned long *resp)
+{
+ cid->mid = resp[0] >> 24;
+ cid->oid = (resp[0] >> 8) & 0xffff;
+ cid->pnm[0] = resp[0];
+ cid->pnm[1] = resp[1] >> 24;
+ cid->pnm[2] = resp[1] >> 16;
+ cid->pnm[3] = resp[1] >> 8;
+ cid->pnm[4] = resp[1];
+ cid->pnm[5] = 0;
+ cid->pnm[6] = 0;
+ cid->prv = resp[2] >> 24;
+ cid->psn = (resp[2] << 8) | (resp[3] >> 24);
+ cid->mdt = (resp[3] >> 8) & 0x0fff;
+}
+
+static void mmc_dump_cid(const struct mmc_cid *cid)
+{
+ printf("Manufacturer ID: %02lX\n", cid->mid);
+ printf("OEM/Application ID: %04lX\n", cid->oid);
+ printf("Product name: %s\n", cid->pnm);
+ printf("Product Revision: %lu.%lu\n",
+ cid->prv >> 4, cid->prv & 0x0f);
+ printf("Product Serial Number: %lu\n", cid->psn);
+ printf("Manufacturing Date: %02lu/%02lu\n",
+ cid->mdt >> 4, cid->mdt & 0x0f);
+}
+
+static void mmc_dump_csd(const struct mmc_csd *csd)
+{
+ unsigned long *csd_raw = (unsigned long *)csd;
+ printf("CSD data: %08lx %08lx %08lx %08lx\n",
+ csd_raw[0], csd_raw[1], csd_raw[2], csd_raw[3]);
+ printf("CSD structure version: 1.%u\n", csd->csd_structure);
+ printf("MMC System Spec version: %u\n", csd->spec_vers);
+ printf("Card command classes: %03x\n", csd->ccc);
+ printf("Read block length: %u\n", 1 << csd->read_bl_len);
+ if (csd->read_bl_partial)
+ puts("Supports partial reads\n");
+ else
+ puts("Does not support partial reads\n");
+ printf("Write block length: %u\n", 1 << csd->write_bl_len);
+ if (csd->write_bl_partial)
+ puts("Supports partial writes\n");
+ else
+ puts("Does not support partial writes\n");
+ if (csd->wp_grp_enable)
+ printf("Supports group WP: %u\n", csd->wp_grp_size + 1);
+ else
+ puts("Does not support group WP\n");
+ printf("Card capacity: %u bytes\n",
+ (csd->c_size + 1) * (1 << (csd->c_size_mult + 2)) *
+ (1 << csd->read_bl_len));
+ printf("File format: %u/%u\n",
+ csd->file_format_grp, csd->file_format);
+ puts("Write protection: ");
+ if (csd->perm_write_protect)
+ puts(" permanent");
+ if (csd->tmp_write_protect)
+ puts(" temporary");
+ putc('\n');
+}
+
+static int mmc_idle_cards(void)
+{
+ int ret;
+
+ /* Reset and initialize all cards */
+ ret = mmc_cmd(MMC_CMD_GO_IDLE_STATE, 0, NULL, 0);
+ if (ret)
+ return ret;
+
+ /* Keep the bus idle for 74 clock cycles */
+ return mmc_cmd(0, 0, NULL, INIT_CMD);
+}
+
+static int sd_init_card(struct mmc_cid *cid, int verbose)
+{
+ unsigned long resp[4];
+ int i, ret = 0;
+
+ mmc_idle_cards();
+ for (i = 0; i < 1000; i++) {
+ ret = mmc_acmd(MMC_ACMD_SD_SEND_OP_COND, CFG_MMC_OP_COND,
+ resp, R3 | NID);
+ if (ret || (resp[0] & 0x80000000))
+ break;
+ ret = -ETIMEDOUT;
+ }
+
+ if (ret)
+ return ret;
+
+ ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, R2 | NID);
+ if (ret)
+ return ret;
+ sd_parse_cid(cid, resp);
+ if (verbose)
+ mmc_dump_cid(cid);
+
+ /* Get RCA of the card that responded */
+ ret = mmc_cmd(MMC_CMD_SD_SEND_RELATIVE_ADDR, 0, resp, R6 | NCR);
+ if (ret)
+ return ret;
+
+ mmc_rca = resp[0] >> 16;
+ if (verbose)
+ printf("SD Card detected (RCA %u)\n", mmc_rca);
+ return 0;
+}
+
+static int mmc_init_card(struct mmc_cid *cid, int verbose)
+{
+ unsigned long resp[4];
+ int i, ret = 0;
+
+ mmc_idle_cards();
+ for (i = 0; i < 1000; i++) {
+ ret = mmc_cmd(MMC_CMD_SEND_OP_COND, CFG_MMC_OP_COND, resp,
+ R3 | NID | OPEN_DRAIN);
+ if (ret || (resp[0] & 0x80000000))
+ break;
+ ret = -ETIMEDOUT;
+ }
+
+ if (ret)
+ return ret;
+
+ /* Get CID of all cards. FIXME: Support more than one card */
+ ret = mmc_cmd(MMC_CMD_ALL_SEND_CID, 0, resp, R2 | NID | OPEN_DRAIN);
+ if (ret)
+ return ret;
+ mmc_parse_cid(cid, resp);
+ if (verbose)
+ mmc_dump_cid(cid);
+
+ /* Set Relative Address of the card that responded */
+ ret = mmc_cmd(MMC_CMD_SET_RELATIVE_ADDR, mmc_rca << 16, resp,
+ R1 | NCR | OPEN_DRAIN);
+ return ret;
+}
+
+int mmc_init(int verbose)
+{
+ struct mmc_cid cid;
+ struct mmc_csd csd;
+ int ret;
+
+ /* Initialize controller */
+ mmci_writel(CR, MMCI_BIT(SWRST));
+ mmci_writel(CR, MMCI_BIT(MCIEN));
+ mmci_writel(DTOR, 0x5f);
+ mmci_writel(IDR, ~0UL);
+ mci_set_mode(CFG_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
+
+ ret = sd_init_card(&cid, verbose);
+ if (ret) {
+ mmc_rca = MMC_DEFAULT_RCA;
+ ret = mmc_init_card(&cid, verbose);
+ }
+ if (ret)
+ return ret;
+
+ /* Get CSD from the card */
+ ret = mmc_cmd(MMC_CMD_SEND_CSD, mmc_rca << 16, &csd, R2 | NCR);
+ if (ret)
+ return ret;
+ if (verbose)
+ mmc_dump_csd(&csd);
+
+ /* Initialize the blockdev structure */
+ mmc_blkdev.if_type = IF_TYPE_MMC;
+ mmc_blkdev.part_type = PART_TYPE_DOS;
+ mmc_blkdev.block_read = mmc_bread;
+ sprintf((char *)mmc_blkdev.vendor,
+ "Man %02x%04x Snr %08x",
+ cid.mid, cid.oid, cid.psn);
+ strncpy((char *)mmc_blkdev.product, cid.pnm,
+ 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;
+ mmc_blkdev.lba = (csd.c_size + 1) * (1 << (csd.c_size_mult + 2));
+
+ mci_set_mode(CFG_MMC_CLK_PP, mmc_blkdev.blksz);
+
+#if 0
+ if (fat_register_device(&mmc_blkdev, 1))
+ printf("Could not register MMC fat device\n");
+#else
+ init_part(&mmc_blkdev);
+#endif
+
+ return 0;
+}
+
+int mmc_read(ulong src, uchar *dst, int size)
+{
+ return -ENOSYS;
+}
+
+int mmc_write(uchar *src, ulong dst, int size)
+{
+ return -ENOSYS;
+}
+
+int mmc2info(ulong addr)
+{
+ return 0;
+}
+
+#endif /* CONFIG_MMC */
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