--- /dev/null
+/*
+ * Copyright (C) 2010
+ * Rob Emanuele <rob@emanuele.us>
+ * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
+ *
+ * Original Driver:
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <mmc.h>
+#include <part.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <asm/errno.h>
+#include <asm/byteorder.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+#include "atmel_mci.h"
+
+#ifndef CONFIG_SYS_MMC_CLK_OD
+# define CONFIG_SYS_MMC_CLK_OD 150000
+#endif
+
+#define MMC_DEFAULT_BLKLEN 512
+
+#if defined(CONFIG_ATMEL_MCI_PORTB)
+# define MCI_BUS 1
+#else
+# define MCI_BUS 0
+#endif
+
+static int initialized = 0;
+
+/* Read Atmel MCI IP version */
+static unsigned int atmel_mci_get_version(struct atmel_mci *mci)
+{
+ return readl(&mci->version) & 0x00000fff;
+}
+
+/*
+ * Print command and status:
+ *
+ * - always when DEBUG is defined
+ * - on command errors
+ */
+static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
+{
+ printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
+ cmdr, cmdr&0x3F, arg, status, msg);
+}
+
+/* Setup for MCI Clock and Block Size */
+static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
+{
+ atmel_mci_t *mci = mmc->priv;
+ u32 bus_hz = get_mci_clk_rate();
+ u32 clkdiv = 255;
+
+ debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
+ bus_hz, hz, blklen);
+ if (hz > 0) {
+ /* find lowest clkdiv yielding a rate <= than requested */
+ for (clkdiv=0; clkdiv<255; clkdiv++) {
+ if ((bus_hz / (clkdiv+1) / 2) <= hz)
+ break;
+ }
+ }
+ printf("mci: setting clock %u Hz, block size %u\n",
+ (bus_hz / (clkdiv+1)) / 2, blklen);
+
+ blklen &= 0xfffc;
+ /* On some platforms RDPROOF and WRPROOF are ignored */
+ writel((MMCI_BF(CLKDIV, clkdiv)
+ | MMCI_BF(BLKLEN, blklen)
+ | MMCI_BIT(RDPROOF)
+ | MMCI_BIT(WRPROOF)), &mci->mr);
+ /*
+ * On some new platforms BLKLEN in mci->mr is ignored.
+ * Should use the BLKLEN in the block register.
+ */
+ writel(MMCI_BF(BLKLEN, blklen), &mci->blkr);
+ initialized = 1;
+}
+
+/* Return the CMDR with flags for a given command and data packet */
+static u32 mci_encode_cmd(
+ struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
+{
+ u32 cmdr = 0;
+
+ /* Default Flags for Errors */
+ *error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
+ MMCI_BIT(RINDE) | MMCI_BIT(RTOE));
+
+ /* Default Flags for the Command */
+ cmdr |= MMCI_BIT(MAXLAT);
+
+ if (data) {
+ cmdr |= MMCI_BF(TRCMD, 1);
+ if (data->blocks > 1)
+ cmdr |= MMCI_BF(TRTYP, 1);
+ if (data->flags & MMC_DATA_READ)
+ cmdr |= MMCI_BIT(TRDIR);
+ }
+
+ if (cmd->resp_type & MMC_RSP_CRC)
+ *error_flags |= MMCI_BIT(RCRCE);
+ if (cmd->resp_type & MMC_RSP_136)
+ cmdr |= MMCI_BF(RSPTYP, 2);
+ else if (cmd->resp_type & MMC_RSP_BUSY)
+ cmdr |= MMCI_BF(RSPTYP, 3);
+ else if (cmd->resp_type & MMC_RSP_PRESENT)
+ cmdr |= MMCI_BF(RSPTYP, 1);
+
+ return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
+}
+
+/* Entered into function pointer in mci_send_cmd */
+static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
+{
+ u32 status;
+
+ do {
+ status = readl(&mci->sr);
+ if (status & (error_flags | MMCI_BIT(OVRE)))
+ goto io_fail;
+ } while (!(status & MMCI_BIT(RXRDY)));
+
+ if (status & MMCI_BIT(RXRDY)) {
+ *data = readl(&mci->rdr);
+ status = 0;
+ }
+io_fail:
+ return status;
+}
+
+/* Entered into function pointer in mci_send_cmd */
+static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
+{
+ u32 status;
+
+ do {
+ status = readl(&mci->sr);
+ if (status & (error_flags | MMCI_BIT(UNRE)))
+ goto io_fail;
+ } while (!(status & MMCI_BIT(TXRDY)));
+
+ if (status & MMCI_BIT(TXRDY)) {
+ writel(*data, &mci->tdr);
+ status = 0;
+ }
+io_fail:
+ return status;
+}
+
+/*
+ * Entered into mmc structure during driver init
+ *
+ * Sends a command out on the bus and deals with the block data.
+ * Takes the mmc pointer, a command pointer, and an optional data pointer.
+ */
+static int
+mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
+{
+ atmel_mci_t *mci = mmc->priv;
+ u32 cmdr;
+ u32 error_flags = 0;
+ u32 status;
+
+ if (!initialized) {
+ puts ("MCI not initialized!\n");
+ return COMM_ERR;
+ }
+
+ /* Figure out the transfer arguments */
+ cmdr = mci_encode_cmd(cmd, data, &error_flags);
+
+ /* For multi blocks read/write, set the block register */
+ if ((cmd->cmdidx == MMC_CMD_READ_MULTIPLE_BLOCK)
+ || (cmd->cmdidx == MMC_CMD_WRITE_MULTIPLE_BLOCK))
+ writel(data->blocks | MMCI_BF(BLKLEN, mmc->read_bl_len),
+ &mci->blkr);
+
+ /* Send the command */
+ writel(cmd->cmdarg, &mci->argr);
+ writel(cmdr, &mci->cmdr);
+
+#ifdef DEBUG
+ dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
+#endif
+
+ /* Wait for the command to complete */
+ while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));
+
+ if ((status & error_flags) & MMCI_BIT(RTOE)) {
+ dump_cmd(cmdr, cmd->cmdarg, status, "Command Time Out");
+ return TIMEOUT;
+ } else if (status & error_flags) {
+ dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
+ return COMM_ERR;
+ }
+
+ /* Copy the response to the response buffer */
+ if (cmd->resp_type & MMC_RSP_136) {
+ cmd->response[0] = readl(&mci->rspr);
+ cmd->response[1] = readl(&mci->rspr1);
+ cmd->response[2] = readl(&mci->rspr2);
+ cmd->response[3] = readl(&mci->rspr3);
+ } else
+ cmd->response[0] = readl(&mci->rspr);
+
+ /* transfer all of the blocks */
+ if (data) {
+ u32 word_count, block_count;
+ u32* ioptr;
+ u32 sys_blocksize, dummy, i;
+ u32 (*mci_data_op)
+ (atmel_mci_t *mci, u32* data, u32 error_flags);
+
+ if (data->flags & MMC_DATA_READ) {
+ mci_data_op = mci_data_read;
+ sys_blocksize = mmc->read_bl_len;
+ ioptr = (u32*)data->dest;
+ } else {
+ mci_data_op = mci_data_write;
+ sys_blocksize = mmc->write_bl_len;
+ ioptr = (u32*)data->src;
+ }
+
+ status = 0;
+ for (block_count = 0;
+ block_count < data->blocks && !status;
+ block_count++) {
+ word_count = 0;
+ do {
+ status = mci_data_op(mci, ioptr, error_flags);
+ word_count++;
+ ioptr++;
+ } while (!status && word_count < (data->blocksize/4));
+#ifdef DEBUG
+ if (data->flags & MMC_DATA_READ)
+ {
+ printf("Read Data:\n");
+ print_buffer(0, data->dest, 1,
+ word_count*4, 0);
+ }
+#endif
+#ifdef DEBUG
+ if (!status && word_count < (sys_blocksize / 4))
+ printf("filling rest of block...\n");
+#endif
+ /* fill the rest of a full block */
+ while (!status && word_count < (sys_blocksize / 4)) {
+ status = mci_data_op(mci, &dummy,
+ error_flags);
+ word_count++;
+ }
+ if (status) {
+ dump_cmd(cmdr, cmd->cmdarg, status,
+ "Data Transfer Failed");
+ return COMM_ERR;
+ }
+ }
+
+ /* Wait for Transfer End */
+ i = 0;
+ do {
+ status = readl(&mci->sr);
+
+ if (status & error_flags) {
+ dump_cmd(cmdr, cmd->cmdarg, status,
+ "DTIP Wait Failed");
+ return COMM_ERR;
+ }
+ i++;
+ } while ((status & MMCI_BIT(DTIP)) && i < 10000);
+ if (status & MMCI_BIT(DTIP)) {
+ dump_cmd(cmdr, cmd->cmdarg, status,
+ "XFER DTIP never unset, ignoring");
+ }
+ }
+
+ return 0;
+}
+
+/* Entered into mmc structure during driver init */
+static void mci_set_ios(struct mmc *mmc)
+{
+ atmel_mci_t *mci = mmc->priv;
+ int bus_width = mmc->bus_width;
+ unsigned int version = atmel_mci_get_version(mci);
+ int busw;
+
+ /* Set the clock speed */
+ mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
+
+ /*
+ * set the bus width and select slot for this interface
+ * there is no capability for multiple slots on the same interface yet
+ */
+ if ((version & 0xf00) >= 0x300) {
+ switch (bus_width) {
+ case 8:
+ busw = 3;
+ break;
+ case 4:
+ busw = 2;
+ break;
+ default:
+ busw = 0;
+ break;
+ }
+
+ writel(busw << 6 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+ } else {
+ busw = (bus_width == 4) ? 1 : 0;
+
+ writel(busw << 7 | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
+ }
+}
+
+/* Entered into mmc structure during driver init */
+static int mci_init(struct mmc *mmc)
+{
+ atmel_mci_t *mci = mmc->priv;
+
+ /* Initialize controller */
+ writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */
+ writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */
+ writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */
+ writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); /* select port */
+
+ /* This delay can be optimized, but stick with max value */
+ writel(0x7f, &mci->dtor);
+ /* Disable Interrupts */
+ writel(~0UL, &mci->idr);
+
+ /* Set default clocks and blocklen */
+ mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
+
+ return 0;
+}
+
+static const struct mmc_ops atmel_mci_ops = {
+ .send_cmd = mci_send_cmd,
+ .set_ios = mci_set_ios,
+ .init = mci_init,
+};
+
+/*
+ * This is the only exported function
+ *
+ * Call it with the MCI register base address
+ */
+int atmel_mci_init(void *regs)
+{
+ struct mmc *mmc;
+ struct mmc_config *cfg;
+ struct atmel_mci *mci;
+ unsigned int version;
+
+ cfg = malloc(sizeof(*cfg));
+ if (cfg == NULL)
+ return -1;
+ memset(cfg, 0, sizeof(*cfg));
+
+ mci = (struct atmel_mci *)regs;
+
+ cfg->name = "mci";
+ cfg->ops = &atmel_mci_ops;
+
+ /* need to be able to pass these in on a board by board basis */
+ cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
+ version = atmel_mci_get_version(mci);
+ if ((version & 0xf00) >= 0x300)
+ cfg->host_caps = MMC_MODE_8BIT;
+
+ cfg->host_caps |= MMC_MODE_4BIT;
+
+ /*
+ * min and max frequencies determined by
+ * max and min of clock divider
+ */
+ cfg->f_min = get_mci_clk_rate() / (2*256);
+ cfg->f_max = get_mci_clk_rate() / (2*1);
+
+ cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
+
+ mmc = mmc_create(cfg, regs);
+
+ if (mmc == NULL) {
+ free(cfg);
+ return -1;
+ }
+ /* NOTE: possibly leaking the cfg structure */
+
+ return 0;
+}
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