mmc: Tegra2: SD/MMC driver for Seaboard - eMMC on SDMMC4, SDIO on SDMMC3
Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/mmc/tegra2_mmc.c b/drivers/mmc/tegra2_mmc.c
new file mode 100644
index 0000000..8b6f829
--- /dev/null
+++ b/drivers/mmc/tegra2_mmc.c
@@ -0,0 +1,510 @@
+/*
+ * (C) Copyright 2009 SAMSUNG Electronics
+ * Minkyu Kang <mk7.kang@samsung.com>
+ * Jaehoon Chung <jh80.chung@samsung.com>
+ * Portions Copyright 2011 NVIDIA Corporation
+ *
+ * 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>
+#include <mmc.h>
+#include <asm/io.h>
+#include <asm/arch/clk_rst.h>
+#include "tegra2_mmc.h"
+
+/* support 4 mmc hosts */
+struct mmc mmc_dev[4];
+struct mmc_host mmc_host[4];
+
+static inline struct tegra2_mmc *tegra2_get_base_mmc(int dev_index)
+{
+ unsigned long offset;
+ debug("tegra2_get_base_mmc: dev_index = %d\n", dev_index);
+
+ switch (dev_index) {
+ case 0:
+ offset = TEGRA2_SDMMC4_BASE;
+ break;
+ case 1:
+ offset = TEGRA2_SDMMC3_BASE;
+ break;
+ case 2:
+ offset = TEGRA2_SDMMC2_BASE;
+ break;
+ case 3:
+ offset = TEGRA2_SDMMC1_BASE;
+ break;
+ default:
+ offset = TEGRA2_SDMMC4_BASE;
+ break;
+ }
+
+ return (struct tegra2_mmc *)(offset);
+}
+
+static void mmc_prepare_data(struct mmc_host *host, struct mmc_data *data)
+{
+ unsigned char ctrl;
+
+ debug("data->dest: %08X, data->blocks: %u, data->blocksize: %u\n",
+ (u32)data->dest, data->blocks, data->blocksize);
+
+ writel((u32)data->dest, &host->reg->sysad);
+ /*
+ * DMASEL[4:3]
+ * 00 = Selects SDMA
+ * 01 = Reserved
+ * 10 = Selects 32-bit Address ADMA2
+ * 11 = Selects 64-bit Address ADMA2
+ */
+ ctrl = readb(&host->reg->hostctl);
+ ctrl &= ~(3 << 3); /* SDMA */
+ writeb(ctrl, &host->reg->hostctl);
+
+ /* We do not handle DMA boundaries, so set it to max (512 KiB) */
+ writew((7 << 12) | (data->blocksize & 0xFFF), &host->reg->blksize);
+ writew(data->blocks, &host->reg->blkcnt);
+}
+
+static void mmc_set_transfer_mode(struct mmc_host *host, struct mmc_data *data)
+{
+ unsigned short mode;
+ debug(" mmc_set_transfer_mode called\n");
+ /*
+ * TRNMOD
+ * MUL1SIN0[5] : Multi/Single Block Select
+ * RD1WT0[4] : Data Transfer Direction Select
+ * 1 = read
+ * 0 = write
+ * ENACMD12[2] : Auto CMD12 Enable
+ * ENBLKCNT[1] : Block Count Enable
+ * ENDMA[0] : DMA Enable
+ */
+ mode = (1 << 1) | (1 << 0);
+ if (data->blocks > 1)
+ mode |= (1 << 5);
+ if (data->flags & MMC_DATA_READ)
+ mode |= (1 << 4);
+
+ writew(mode, &host->reg->trnmod);
+}
+
+static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
+ struct mmc_data *data)
+{
+ struct mmc_host *host = (struct mmc_host *)mmc->priv;
+ int flags, i;
+ unsigned int timeout;
+ unsigned int mask;
+ unsigned int retry = 0x100000;
+ debug(" mmc_send_cmd called\n");
+
+ /* Wait max 10 ms */
+ timeout = 10;
+
+ /*
+ * PRNSTS
+ * CMDINHDAT[1] : Command Inhibit (DAT)
+ * CMDINHCMD[0] : Command Inhibit (CMD)
+ */
+ mask = (1 << 0);
+ if ((data != NULL) || (cmd->resp_type & MMC_RSP_BUSY))
+ mask |= (1 << 1);
+
+ /*
+ * We shouldn't wait for data inhibit for stop commands, even
+ * though they might use busy signaling
+ */
+ if (data)
+ mask &= ~(1 << 1);
+
+ while (readl(&host->reg->prnsts) & mask) {
+ if (timeout == 0) {
+ printf("%s: timeout error\n", __func__);
+ return -1;
+ }
+ timeout--;
+ udelay(1000);
+ }
+
+ if (data)
+ mmc_prepare_data(host, data);
+
+ debug("cmd->arg: %08x\n", cmd->cmdarg);
+ writel(cmd->cmdarg, &host->reg->argument);
+
+ if (data)
+ mmc_set_transfer_mode(host, data);
+
+ if ((cmd->resp_type & MMC_RSP_136) && (cmd->resp_type & MMC_RSP_BUSY))
+ return -1;
+
+ /*
+ * CMDREG
+ * CMDIDX[13:8] : Command index
+ * DATAPRNT[5] : Data Present Select
+ * ENCMDIDX[4] : Command Index Check Enable
+ * ENCMDCRC[3] : Command CRC Check Enable
+ * RSPTYP[1:0]
+ * 00 = No Response
+ * 01 = Length 136
+ * 10 = Length 48
+ * 11 = Length 48 Check busy after response
+ */
+ if (!(cmd->resp_type & MMC_RSP_PRESENT))
+ flags = 0;
+ else if (cmd->resp_type & MMC_RSP_136)
+ flags = (1 << 0);
+ else if (cmd->resp_type & MMC_RSP_BUSY)
+ flags = (3 << 0);
+ else
+ flags = (2 << 0);
+
+ if (cmd->resp_type & MMC_RSP_CRC)
+ flags |= (1 << 3);
+ if (cmd->resp_type & MMC_RSP_OPCODE)
+ flags |= (1 << 4);
+ if (data)
+ flags |= (1 << 5);
+
+ debug("cmd: %d\n", cmd->cmdidx);
+
+ writew((cmd->cmdidx << 8) | flags, &host->reg->cmdreg);
+
+ for (i = 0; i < retry; i++) {
+ mask = readl(&host->reg->norintsts);
+ /* Command Complete */
+ if (mask & (1 << 0)) {
+ if (!data)
+ writel(mask, &host->reg->norintsts);
+ break;
+ }
+ }
+
+ if (i == retry) {
+ printf("%s: waiting for status update\n", __func__);
+ return TIMEOUT;
+ }
+
+ if (mask & (1 << 16)) {
+ /* Timeout Error */
+ debug("timeout: %08x cmd %d\n", mask, cmd->cmdidx);
+ return TIMEOUT;
+ } else if (mask & (1 << 15)) {
+ /* Error Interrupt */
+ debug("error: %08x cmd %d\n", mask, cmd->cmdidx);
+ return -1;
+ }
+
+ if (cmd->resp_type & MMC_RSP_PRESENT) {
+ if (cmd->resp_type & MMC_RSP_136) {
+ /* CRC is stripped so we need to do some shifting. */
+ for (i = 0; i < 4; i++) {
+ unsigned int offset =
+ (unsigned int)(&host->reg->rspreg3 - i);
+ cmd->response[i] = readl(offset) << 8;
+
+ if (i != 3) {
+ cmd->response[i] |=
+ readb(offset - 1);
+ }
+ debug("cmd->resp[%d]: %08x\n",
+ i, cmd->response[i]);
+ }
+ } else if (cmd->resp_type & MMC_RSP_BUSY) {
+ for (i = 0; i < retry; i++) {
+ /* PRNTDATA[23:20] : DAT[3:0] Line Signal */
+ if (readl(&host->reg->prnsts)
+ & (1 << 20)) /* DAT[0] */
+ break;
+ }
+
+ if (i == retry) {
+ printf("%s: card is still busy\n", __func__);
+ return TIMEOUT;
+ }
+
+ cmd->response[0] = readl(&host->reg->rspreg0);
+ debug("cmd->resp[0]: %08x\n", cmd->response[0]);
+ } else {
+ cmd->response[0] = readl(&host->reg->rspreg0);
+ debug("cmd->resp[0]: %08x\n", cmd->response[0]);
+ }
+ }
+
+ if (data) {
+ while (1) {
+ mask = readl(&host->reg->norintsts);
+
+ if (mask & (1 << 15)) {
+ /* Error Interrupt */
+ writel(mask, &host->reg->norintsts);
+ printf("%s: error during transfer: 0x%08x\n",
+ __func__, mask);
+ return -1;
+ } else if (mask & (1 << 3)) {
+ /* DMA Interrupt */
+ debug("DMA end\n");
+ break;
+ } else if (mask & (1 << 1)) {
+ /* Transfer Complete */
+ debug("r/w is done\n");
+ break;
+ }
+ }
+ writel(mask, &host->reg->norintsts);
+ }
+
+ udelay(1000);
+ return 0;
+}
+
+static void mmc_change_clock(struct mmc_host *host, uint clock)
+{
+ int div, hw_div;
+ unsigned short clk;
+ unsigned long timeout;
+ unsigned int reg, hostbase;
+ struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
+ debug(" mmc_change_clock called\n");
+
+ /* Change Tegra2 SDMMCx clock divisor here */
+ /* Source is 216MHz, PLLP_OUT0 */
+ if (clock == 0)
+ goto out;
+
+ div = 1;
+ if (clock <= 400000) {
+ hw_div = ((9-1)<<1); /* Best match is 375KHz */
+ div = 64;
+ } else if (clock <= 20000000)
+ hw_div = ((11-1)<<1); /* Best match is 19.6MHz */
+ else if (clock <= 26000000)
+ hw_div = ((9-1)<<1); /* Use 24MHz */
+ else
+ hw_div = ((4-1)<<1) + 1; /* 4.5 divisor for 48MHz */
+
+ debug("mmc_change_clock: hw_div = %d, card clock div = %d\n",
+ hw_div, div);
+
+ /* Change SDMMCx divisor */
+
+ hostbase = readl(&host->base);
+ debug("mmc_change_clock: hostbase = %08X\n", hostbase);
+
+ if (hostbase == TEGRA2_SDMMC1_BASE) {
+ reg = readl(&clkrst->crc_clk_src_sdmmc1);
+ reg &= 0xFFFFFF00; /* divisor (7.1) = 00 */
+ reg |= hw_div; /* n-1 */
+ writel(reg, &clkrst->crc_clk_src_sdmmc1);
+ } else if (hostbase == TEGRA2_SDMMC2_BASE) {
+ reg = readl(&clkrst->crc_clk_src_sdmmc2);
+ reg &= 0xFFFFFF00; /* divisor (7.1) = 00 */
+ reg |= hw_div; /* n-1 */
+ writel(reg, &clkrst->crc_clk_src_sdmmc2);
+ } else if (hostbase == TEGRA2_SDMMC3_BASE) {
+ reg = readl(&clkrst->crc_clk_src_sdmmc3);
+ reg &= 0xFFFFFF00; /* divisor (7.1) = 00 */
+ reg |= hw_div; /* n-1 */
+ writel(reg, &clkrst->crc_clk_src_sdmmc3);
+ } else {
+ reg = readl(&clkrst->crc_clk_src_sdmmc4);
+ reg &= 0xFFFFFF00; /* divisor (7.1) = 00 */
+ reg |= hw_div; /* n-1 */
+ writel(reg, &clkrst->crc_clk_src_sdmmc4);
+ }
+
+ writew(0, &host->reg->clkcon);
+
+ div >>= 1;
+ /*
+ * CLKCON
+ * SELFREQ[15:8] : base clock divided by value
+ * ENSDCLK[2] : SD Clock Enable
+ * STBLINTCLK[1] : Internal Clock Stable
+ * ENINTCLK[0] : Internal Clock Enable
+ */
+ clk = (div << 8) | (1 << 0);
+ writew(clk, &host->reg->clkcon);
+
+ /* Wait max 10 ms */
+ timeout = 10;
+ while (!(readw(&host->reg->clkcon) & (1 << 1))) {
+ if (timeout == 0) {
+ printf("%s: timeout error\n", __func__);
+ return;
+ }
+ timeout--;
+ udelay(1000);
+ }
+
+ clk |= (1 << 2);
+ writew(clk, &host->reg->clkcon);
+
+ debug("mmc_change_clock: clkcon = %08X\n", clk);
+ debug("mmc_change_clock: CLK_SOURCE_SDMMCx = %08X\n", reg);
+
+out:
+ host->clock = clock;
+}
+
+static void mmc_set_ios(struct mmc *mmc)
+{
+ struct mmc_host *host = mmc->priv;
+ unsigned char ctrl;
+ debug(" mmc_set_ios called\n");
+
+ debug("bus_width: %x, clock: %d\n", mmc->bus_width, mmc->clock);
+
+ /* Change clock first */
+
+ mmc_change_clock(host, mmc->clock);
+
+ ctrl = readb(&host->reg->hostctl);
+
+ /*
+ * WIDE8[5]
+ * 0 = Depend on WIDE4
+ * 1 = 8-bit mode
+ * WIDE4[1]
+ * 1 = 4-bit mode
+ * 0 = 1-bit mode
+ */
+ if (mmc->bus_width == 8)
+ ctrl |= (1 << 5);
+ else if (mmc->bus_width == 4)
+ ctrl |= (1 << 1);
+ else
+ ctrl &= ~(1 << 1);
+
+ writeb(ctrl, &host->reg->hostctl);
+ debug("mmc_set_ios: hostctl = %08X\n", ctrl);
+}
+
+static void mmc_reset(struct mmc_host *host)
+{
+ unsigned int timeout;
+ debug(" mmc_reset called\n");
+
+ /*
+ * RSTALL[0] : Software reset for all
+ * 1 = reset
+ * 0 = work
+ */
+ writeb((1 << 0), &host->reg->swrst);
+
+ host->clock = 0;
+
+ /* Wait max 100 ms */
+ timeout = 100;
+
+ /* hw clears the bit when it's done */
+ while (readb(&host->reg->swrst) & (1 << 0)) {
+ if (timeout == 0) {
+ printf("%s: timeout error\n", __func__);
+ return;
+ }
+ timeout--;
+ udelay(1000);
+ }
+}
+
+static int mmc_core_init(struct mmc *mmc)
+{
+ struct mmc_host *host = (struct mmc_host *)mmc->priv;
+ unsigned int mask;
+ debug(" mmc_core_init called\n");
+
+ mmc_reset(host);
+
+ host->version = readw(&host->reg->hcver);
+ debug("host version = %x\n", host->version);
+
+ /* mask all */
+ writel(0xffffffff, &host->reg->norintstsen);
+ writel(0xffffffff, &host->reg->norintsigen);
+
+ writeb(0xe, &host->reg->timeoutcon); /* TMCLK * 2^27 */
+ /*
+ * NORMAL Interrupt Status Enable Register init
+ * [5] ENSTABUFRDRDY : Buffer Read Ready Status Enable
+ * [4] ENSTABUFWTRDY : Buffer write Ready Status Enable
+ * [1] ENSTASTANSCMPLT : Transfre Complete Status Enable
+ * [0] ENSTACMDCMPLT : Command Complete Status Enable
+ */
+ mask = readl(&host->reg->norintstsen);
+ mask &= ~(0xffff);
+ mask |= (1 << 5) | (1 << 4) | (1 << 1) | (1 << 0);
+ writel(mask, &host->reg->norintstsen);
+
+ /*
+ * NORMAL Interrupt Signal Enable Register init
+ * [1] ENSTACMDCMPLT : Transfer Complete Signal Enable
+ */
+ mask = readl(&host->reg->norintsigen);
+ mask &= ~(0xffff);
+ mask |= (1 << 1);
+ writel(mask, &host->reg->norintsigen);
+
+ return 0;
+}
+
+static int tegra2_mmc_initialize(int dev_index, int bus_width)
+{
+ struct mmc *mmc;
+
+ debug(" mmc_initialize called\n");
+
+ mmc = &mmc_dev[dev_index];
+
+ sprintf(mmc->name, "Tegra2 SD/MMC");
+ mmc->priv = &mmc_host[dev_index];
+ mmc->send_cmd = mmc_send_cmd;
+ mmc->set_ios = mmc_set_ios;
+ mmc->init = mmc_core_init;
+
+ mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
+ if (bus_width == 8)
+ mmc->host_caps = MMC_MODE_8BIT;
+ else
+ mmc->host_caps = MMC_MODE_4BIT;
+ mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
+
+ /*
+ * min freq is for card identification, and is the highest
+ * low-speed SDIO card frequency (actually 400KHz)
+ * max freq is highest HS eMMC clock as per the SD/MMC spec
+ * (actually 52MHz)
+ * Both of these are the closest equivalents w/216MHz source
+ * clock and Tegra2 SDMMC divisors.
+ */
+ mmc->f_min = 375000;
+ mmc->f_max = 48000000;
+
+ mmc_host[dev_index].clock = 0;
+ mmc_host[dev_index].reg = tegra2_get_base_mmc(dev_index);
+ mmc_host[dev_index].base = (unsigned int)mmc_host[dev_index].reg;
+ mmc_register(mmc);
+
+ return 0;
+}
+
+int tegra2_mmc_init(int dev_index, int bus_width)
+{
+ debug(" tegra2_mmc_init: index %d, bus width %d\n",
+ dev_index, bus_width);
+ return tegra2_mmc_initialize(dev_index, bus_width);
+}