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-rw-r--r--drivers/rpi3/sdhost/rpi3_sdhost.c679
1 files changed, 679 insertions, 0 deletions
diff --git a/drivers/rpi3/sdhost/rpi3_sdhost.c b/drivers/rpi3/sdhost/rpi3_sdhost.c
new file mode 100644
index 0000000..c4b6fca
--- /dev/null
+++ b/drivers/rpi3/sdhost/rpi3_sdhost.c
@@ -0,0 +1,679 @@
+/*
+ * Copyright (c) 2019, Linaro Limited
+ * Copyright (c) 2019, Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <drivers/delay_timer.h>
+#include <drivers/rpi3/sdhost/rpi3_sdhost.h>
+#include <drivers/mmc.h>
+#include <drivers/rpi3/gpio/rpi3_gpio.h>
+#include <errno.h>
+#include <string.h>
+
+static void rpi3_sdhost_initialize(void);
+static int rpi3_sdhost_send_cmd(struct mmc_cmd *cmd);
+static int rpi3_sdhost_set_ios(unsigned int clk, unsigned int width);
+static int rpi3_sdhost_prepare(int lba, uintptr_t buf, size_t size);
+static int rpi3_sdhost_read(int lba, uintptr_t buf, size_t size);
+static int rpi3_sdhost_write(int lba, uintptr_t buf, size_t size);
+
+static const struct mmc_ops rpi3_sdhost_ops = {
+ .init = rpi3_sdhost_initialize,
+ .send_cmd = rpi3_sdhost_send_cmd,
+ .set_ios = rpi3_sdhost_set_ios,
+ .prepare = rpi3_sdhost_prepare,
+ .read = rpi3_sdhost_read,
+ .write = rpi3_sdhost_write,
+};
+
+static struct rpi3_sdhost_params rpi3_sdhost_params;
+
+/**
+ * Wait for command being processed.
+ *
+ * This function waits the command being processed. It compares
+ * the ENABLE flag of the HC_COMMAND register. When ENABLE flag disappeared
+ * it means the command is processed by the SDHOST.
+ * The timeout is currently 1000*100 us = 100 ms.
+ *
+ * @return 0: command finished. 1: command timed out.
+ */
+static int rpi3_sdhost_waitcommand(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+
+ volatile int timeout = 1000;
+
+ while ((mmio_read_32(reg_base + HC_COMMAND) & HC_CMD_ENABLE)
+ && (--timeout > 0)) {
+ udelay(100);
+ }
+
+ return ((timeout > 0) ? 0 : (-(ETIMEDOUT)));
+}
+
+/**
+ * Send the command and argument to the SDHOST
+ *
+ * This function will wait for the previous command finished. And then
+ * clear any error status of previous command. And then
+ * send out the command and args. The command will be turned on the ENABLE
+ * flag before sending out.
+ */
+static void send_command_raw(unsigned int cmd, unsigned int arg)
+{
+ unsigned int status;
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+
+ /* wait for previous command finish */
+ rpi3_sdhost_waitcommand();
+
+ /* clean error status */
+ status = mmio_read_32(reg_base + HC_HOSTSTATUS);
+ if (status & HC_HSTST_MASK_ERROR_ALL)
+ mmio_write_32(reg_base + HC_HOSTSTATUS, status);
+
+ /* recording the command */
+ rpi3_sdhost_params.current_cmd = cmd & HC_CMD_COMMAND_MASK;
+
+ /* send the argument and command */
+ mmio_write_32(reg_base + HC_ARGUMENT, arg);
+ mmio_write_32(reg_base + HC_COMMAND, cmd | HC_CMD_ENABLE);
+}
+
+/**
+ * Send the command and argument to the SDHOST, decorated with control
+ * flags.
+ *
+ * This function will use send_command_raw to send the commands to SDHOST.
+ * But before sending it will decorate the command with control flags specific
+ * to SDHOST.
+ */
+static void send_command_decorated(unsigned int cmd, unsigned int arg)
+{
+ unsigned int cmd_flags = 0;
+
+ switch (cmd & HC_CMD_COMMAND_MASK) {
+ case MMC_CMD(0):
+ cmd_flags |= HC_CMD_RESPONSE_NONE;
+ break;
+ case MMC_ACMD(51):
+ cmd_flags |= HC_CMD_READ;
+ break;
+ case MMC_CMD(8):
+ case MMC_CMD(11):
+ case MMC_CMD(17):
+ case MMC_CMD(18):
+ cmd_flags |= HC_CMD_READ;
+ break;
+ case MMC_CMD(20):
+ case MMC_CMD(24):
+ case MMC_CMD(25):
+ cmd_flags |= HC_CMD_WRITE;
+ break;
+ case MMC_CMD(12):
+ cmd_flags |= HC_CMD_BUSY;
+ break;
+ default:
+ break;
+ }
+ send_command_raw(cmd | cmd_flags, arg);
+}
+
+/**
+ * drains the FIFO on DATA port
+ *
+ * This function drains any data left in the DATA port.
+ */
+static void rpi3_drain_fifo(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ volatile int timeout = 100000;
+
+ rpi3_sdhost_waitcommand();
+
+ while (mmio_read_32(reg_base + HC_HOSTSTATUS) & HC_HSTST_HAVEDATA) {
+ mmio_read_32(reg_base + HC_DATAPORT);
+ udelay(100);
+ }
+
+ while (1) {
+ uint32_t edm, fsm;
+
+ edm = mmio_read_32(reg_base + HC_DEBUG);
+ fsm = edm & HC_DBG_FSM_MASK;
+
+ if ((fsm == HC_DBG_FSM_IDENTMODE) ||
+ (fsm == HC_DBG_FSM_DATAMODE))
+ break;
+
+ if ((fsm == HC_DBG_FSM_READWAIT) ||
+ (fsm == HC_DBG_FSM_WRITESTART1) ||
+ (fsm == HC_DBG_FSM_READDATA)) {
+ mmio_write_32(reg_base + HC_DEBUG,
+ edm | HC_DBG_FORCE_DATA_MODE);
+ break;
+ }
+
+ if (--timeout <= 0) {
+ ERROR("rpi3_sdhost: %s cannot recover stat\n",
+ __func__);
+ return;
+ }
+ }
+}
+
+/**
+ * Dump SDHOST registers
+ */
+static void rpi3_sdhost_print_regs(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+
+ INFO("rpi3_sdhost: HC_COMMAND: 0x%08x\n",
+ mmio_read_32(reg_base + HC_COMMAND));
+ INFO("rpi3_sdhost: HC_ARGUMENT: 0x%08x\n",
+ mmio_read_32(reg_base + HC_ARGUMENT));
+ INFO("rpi3_sdhost: HC_TIMEOUTCOUNTER: 0x%08x\n",
+ mmio_read_32(reg_base + HC_TIMEOUTCOUNTER));
+ INFO("rpi3_sdhost: HC_CLOCKDIVISOR: 0x%08x\n",
+ mmio_read_32(reg_base + HC_CLOCKDIVISOR));
+ INFO("rpi3_sdhost: HC_RESPONSE_0: 0x%08x\n",
+ mmio_read_32(reg_base + HC_RESPONSE_0));
+ INFO("rpi3_sdhost: HC_RESPONSE_1: 0x%08x\n",
+ mmio_read_32(reg_base + HC_RESPONSE_1));
+ INFO("rpi3_sdhost: HC_RESPONSE_2: 0x%08x\n",
+ mmio_read_32(reg_base + HC_RESPONSE_2));
+ INFO("rpi3_sdhost: HC_RESPONSE_3: 0x%08x\n",
+ mmio_read_32(reg_base + HC_RESPONSE_3));
+ INFO("rpi3_sdhost: HC_HOSTSTATUS: 0x%08x\n",
+ mmio_read_32(reg_base + HC_HOSTSTATUS));
+ INFO("rpi3_sdhost: HC_POWER: 0x%08x\n",
+ mmio_read_32(reg_base + HC_POWER));
+ INFO("rpi3_sdhost: HC_DEBUG: 0x%08x\n",
+ mmio_read_32(reg_base + HC_DEBUG));
+ INFO("rpi3_sdhost: HC_HOSTCONFIG: 0x%08x\n",
+ mmio_read_32(reg_base + HC_HOSTCONFIG));
+ INFO("rpi3_sdhost: HC_BLOCKSIZE: 0x%08x\n",
+ mmio_read_32(reg_base + HC_BLOCKSIZE));
+ INFO("rpi3_sdhost: HC_BLOCKCOUNT: 0x%08x\n",
+ mmio_read_32(reg_base + HC_BLOCKCOUNT));
+}
+
+/**
+ * Reset SDHOST
+ */
+static void rpi3_sdhost_reset(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ unsigned int dbg;
+ uint32_t tmp1;
+
+ mmio_write_32(reg_base + HC_POWER, 0);
+ mmio_write_32(reg_base + HC_COMMAND, 0);
+ mmio_write_32(reg_base + HC_ARGUMENT, 0);
+
+ mmio_write_32(reg_base + HC_TIMEOUTCOUNTER, HC_TIMEOUT_DEFAULT);
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR, 0);
+ mmio_write_32(reg_base + HC_HOSTSTATUS, HC_HSTST_RESET);
+ mmio_write_32(reg_base + HC_HOSTCONFIG, 0);
+ mmio_write_32(reg_base + HC_BLOCKSIZE, 0);
+ mmio_write_32(reg_base + HC_BLOCKCOUNT, 0);
+
+ dbg = mmio_read_32(reg_base + HC_DEBUG);
+ dbg &= ~((HC_DBG_FIFO_THRESH_MASK << HC_DBG_FIFO_THRESH_READ_SHIFT) |
+ (HC_DBG_FIFO_THRESH_MASK << HC_DBG_FIFO_THRESH_WRITE_SHIFT));
+ dbg |= (HC_FIFO_THRESH_READ << HC_DBG_FIFO_THRESH_READ_SHIFT) |
+ (HC_FIFO_THRESH_WRITE << HC_DBG_FIFO_THRESH_WRITE_SHIFT);
+ mmio_write_32(reg_base + HC_DEBUG, dbg);
+ mdelay(250);
+ mmio_write_32(reg_base + HC_POWER, 1);
+ mdelay(250);
+ rpi3_sdhost_params.clk_rate = 0;
+
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR, HC_CLOCKDIVISOR_MAXVAL);
+ tmp1 = mmio_read_32(reg_base + HC_HOSTCONFIG);
+ mmio_write_32(reg_base + HC_HOSTCONFIG, tmp1 | HC_HSTCF_INT_BUSY);
+}
+
+static void rpi3_sdhost_initialize(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+
+ assert((rpi3_sdhost_params.reg_base & MMC_BLOCK_MASK) == 0);
+
+ rpi3_sdhost_reset();
+
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR, HC_CLOCKDIVISOR_PREFERVAL);
+ udelay(300);
+}
+
+static int rpi3_sdhost_send_cmd(struct mmc_cmd *cmd)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ int err = 0;
+ uint32_t cmd_idx;
+ uint32_t cmd_arg;
+ uint32_t cmd_flags = 0;
+ uint32_t intmask;
+
+ /* Wait for the command done */
+ err = rpi3_sdhost_waitcommand();
+ if (err != 0) {
+ WARN("previous command not done yet\n");
+ return err;
+ }
+
+ cmd_idx = cmd->cmd_idx & HC_CMD_COMMAND_MASK;
+
+ cmd_arg = cmd->cmd_arg;
+ if (cmd_idx == MMC_ACMD(51)) {
+ /* if previous cmd send to SDHOST is not MMC_CMD(55).
+ * It means this MMC_ACMD(51) is a resend.
+ * And we must also resend MMC_CMD(55) in this case
+ */
+ if (rpi3_sdhost_params.current_cmd != MMC_CMD(55)) {
+ send_command_decorated(
+ MMC_CMD(55),
+ rpi3_sdhost_params.sdcard_rca <<
+ RCA_SHIFT_OFFSET);
+ rpi3_sdhost_params.mmc_app_cmd = 1;
+ rpi3_sdhost_waitcommand();
+
+ /* Also we need to call prepare to clean the buffer */
+ rpi3_sdhost_prepare(0, (uintptr_t)NULL, 8);
+ }
+ }
+
+ /* We ignore MMC_CMD(12) sending from the TF-A's MMC driver
+ * because we send MMC_CMD(12) by ourselves.
+ */
+ if (cmd_idx == MMC_CMD(12))
+ return 0;
+
+ if ((cmd->resp_type & MMC_RSP_136) &&
+ (cmd->resp_type & MMC_RSP_BUSY)) {
+ ERROR("rpi3_sdhost: unsupported response type!\n");
+ return -(EOPNOTSUPP);
+ }
+
+ if (cmd->resp_type & MMC_RSP_48 && cmd->resp_type != MMC_RESPONSE_R2) {
+ /* 48-bit command
+ * We don't need to set any flags here because it is default.
+ */
+ } else if (cmd->resp_type & MMC_RSP_136) {
+ /* 136-bit command */
+ cmd_flags |= HC_CMD_RESPONSE_LONG;
+ } else {
+ /* no respond command */
+ cmd_flags |= HC_CMD_RESPONSE_NONE;
+ }
+
+ rpi3_sdhost_params.cmdbusy = 0;
+ if (cmd->resp_type & MMC_RSP_BUSY) {
+ cmd_flags |= HC_CMD_BUSY;
+ rpi3_sdhost_params.cmdbusy = 1;
+ }
+
+ if (rpi3_sdhost_params.mmc_app_cmd) {
+ switch (cmd_idx) {
+ case MMC_ACMD(41):
+ if (cmd_arg == OCR_HCS)
+ cmd_arg |= OCR_3_3_3_4;
+ break;
+ default:
+ break;
+ }
+ rpi3_sdhost_params.mmc_app_cmd = 0;
+ }
+
+ if (cmd_idx == MMC_CMD(55))
+ rpi3_sdhost_params.mmc_app_cmd = 1;
+
+ send_command_decorated(cmd_idx | cmd_flags, cmd_arg);
+
+ intmask = mmio_read_32(reg_base + HC_HOSTSTATUS);
+ if (rpi3_sdhost_params.cmdbusy && (intmask & HC_HSTST_INT_BUSY)) {
+ mmio_write_32(reg_base + HC_HOSTSTATUS, HC_HSTST_INT_BUSY);
+ rpi3_sdhost_params.cmdbusy = 0;
+ }
+
+ if (!(cmd_flags & HC_CMD_RESPONSE_NONE)) {
+ err = rpi3_sdhost_waitcommand();
+ if (err != 0)
+ ERROR("rpi3_sdhost: cmd cannot be finished\n");
+ }
+
+ cmd->resp_data[0] = mmio_read_32(reg_base + HC_RESPONSE_0);
+ cmd->resp_data[1] = mmio_read_32(reg_base + HC_RESPONSE_1);
+ cmd->resp_data[2] = mmio_read_32(reg_base + HC_RESPONSE_2);
+ cmd->resp_data[3] = mmio_read_32(reg_base + HC_RESPONSE_3);
+
+ if (mmio_read_32(reg_base + HC_COMMAND) & HC_CMD_FAILED) {
+ uint32_t sdhsts = mmio_read_32(reg_base + HC_HOSTSTATUS);
+
+ mmio_write_32(reg_base + HC_HOSTSTATUS,
+ HC_HSTST_MASK_ERROR_ALL);
+
+ /*
+ * If the command SEND_OP_COND returns with CRC7 error,
+ * it can be considered as having completed successfully.
+ */
+ if (!(sdhsts & HC_HSTST_ERROR_CRC7)
+ || (cmd_idx != MMC_CMD(1))) {
+ if (sdhsts & HC_HSTST_TIMEOUT_CMD) {
+ ERROR("rpi3_sdhost: timeout status 0x%x\n",
+ sdhsts);
+ err = -(ETIMEDOUT);
+ } else {
+ ERROR("rpi3_sdhost: unknown err, cmd = 0x%x\n",
+ mmio_read_32(reg_base + HC_COMMAND));
+ ERROR("rpi3_sdhost status: 0x%x\n", sdhsts);
+ err = -(EILSEQ);
+ }
+ }
+ }
+
+ if ((!err) && (cmd_idx == MMC_CMD(3))) {
+ /* we keep the RCA in case to send MMC_CMD(55) ourselves */
+ rpi3_sdhost_params.sdcard_rca = (cmd->resp_data[0]
+ & 0xFFFF0000U) >> 16;
+ }
+
+ return err;
+}
+
+static int rpi3_sdhost_set_clock(unsigned int clk)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ uint32_t max_clk = 250000000;
+ uint32_t div;
+
+ if (clk < 100000) {
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR,
+ HC_CLOCKDIVISOR_MAXVAL);
+ return 0;
+ }
+
+ div = max_clk / clk;
+ if (div < 2)
+ div = 2;
+
+ if ((max_clk / div) > clk)
+ div++;
+
+ div -= 2;
+ if (div > HC_CLOCKDIVISOR_MAXVAL)
+ div = HC_CLOCKDIVISOR_MAXVAL;
+
+ rpi3_sdhost_params.clk_rate = max_clk / (div + 2);
+ rpi3_sdhost_params.ns_per_fifo_word = (1000000000 /
+ rpi3_sdhost_params.clk_rate)
+ * 8;
+
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR, div);
+ return 0;
+}
+
+static int rpi3_sdhost_set_ios(unsigned int clk, unsigned int width)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ uint32_t tmp1;
+
+ rpi3_sdhost_set_clock(clk);
+ VERBOSE("rpi3_sdhost: Changing clock to %dHz for data mode\n", clk);
+
+ if (width != MMC_BUS_WIDTH_4 && width != MMC_BUS_WIDTH_1) {
+ ERROR("rpi3_sdhost: width %d not supported\n", width);
+ return -(EOPNOTSUPP);
+ }
+ rpi3_sdhost_params.bus_width = width;
+
+ tmp1 = mmio_read_32(reg_base + HC_HOSTCONFIG);
+ tmp1 &= ~(HC_HSTCF_EXTBUS_4BIT);
+ if (rpi3_sdhost_params.bus_width == MMC_BUS_WIDTH_4)
+ tmp1 |= HC_HSTCF_EXTBUS_4BIT;
+
+ mmio_write_32(reg_base + HC_HOSTCONFIG, tmp1);
+ tmp1 = mmio_read_32(reg_base + HC_HOSTCONFIG);
+ mmio_write_32(reg_base + HC_HOSTCONFIG, tmp1 |
+ HC_HSTCF_SLOW_CARD | HC_HSTCF_INTBUS_WIDE);
+
+ return 0;
+}
+
+static int rpi3_sdhost_prepare(int lba, uintptr_t buf, size_t size)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ size_t blocks;
+ size_t blocksize;
+
+ if (size < 512) {
+ blocksize = size;
+ blocks = 1;
+ } else {
+ blocksize = 512;
+ blocks = size / blocksize;
+ if (size % blocksize != 0)
+ blocks++;
+ }
+
+ rpi3_drain_fifo();
+
+ mmio_write_32(reg_base + HC_BLOCKSIZE, blocksize);
+ mmio_write_32(reg_base + HC_BLOCKCOUNT, blocks);
+ udelay(100);
+ return 0;
+}
+
+static int rpi3_sdhost_read(int lba, uintptr_t buf, size_t size)
+{
+ int err = 0;
+ uint32_t *buf1 = ((uint32_t *) buf);
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ int timeout = 100000;
+ int remaining_words = 0;
+
+ for (int i = 0; i < size / 4; i++) {
+ volatile int t = timeout;
+ uint32_t hsts_err;
+
+ while ((mmio_read_32(reg_base + HC_HOSTSTATUS)
+ & HC_HSTST_HAVEDATA) == 0) {
+ if (t == 0) {
+ ERROR("rpi3_sdhost: fifo timeout after %dus\n",
+ timeout);
+ err = -(ETIMEDOUT);
+ break;
+ }
+ t--;
+ udelay(10);
+ }
+ if (t == 0)
+ break;
+
+ uint32_t data = mmio_read_32(reg_base + HC_DATAPORT);
+
+ hsts_err = mmio_read_32(reg_base + HC_HOSTSTATUS)
+ & HC_HSTST_MASK_ERROR_ALL;
+ if (hsts_err) {
+ ERROR("rpi3_sdhost: transfer FIFO word %d: 0x%x\n",
+ i,
+ mmio_read_32(reg_base + HC_HOSTSTATUS));
+ rpi3_sdhost_print_regs();
+
+ err = -(EILSEQ);
+
+ /* clean the error status */
+ mmio_write_32(reg_base + HC_HOSTSTATUS, hsts_err);
+ }
+
+ if (buf1)
+ buf1[i] = data;
+
+ /* speeding up if the remaining words are still a lot */
+ remaining_words = (mmio_read_32(reg_base + HC_DEBUG) >> 4)
+ & HC_DBG_FIFO_THRESH_MASK;
+ if (remaining_words >= 7)
+ continue;
+
+ /* delay. slowing down the read process */
+ udelay(100);
+ }
+
+ /* We decide to stop by ourselves.
+ * It is because MMC_CMD(18) -> MMC_CMD(13) -> MMC_CMD(12)
+ * doesn't work for RPi3 SDHost.
+ */
+ if (rpi3_sdhost_params.current_cmd == MMC_CMD(18))
+ send_command_decorated(MMC_CMD(12), 0);
+
+ return err;
+}
+
+static int rpi3_sdhost_write(int lba, uintptr_t buf, size_t size)
+{
+ uint32_t *buf1 = ((uint32_t *) buf);
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+ int err = 0;
+ int remaining_words = 0;
+
+ for (int i = 0; i < size / 4; i++) {
+ uint32_t hsts_err;
+ uint32_t data = buf1[i];
+ uint32_t dbg;
+ uint32_t fsm_state;
+
+ mmio_write_32(reg_base + HC_DATAPORT, data);
+
+ dbg = mmio_read_32(reg_base + HC_DEBUG);
+ fsm_state = dbg & HC_DBG_FSM_MASK;
+ if (fsm_state != HC_DBG_FSM_WRITEDATA
+ && fsm_state != HC_DBG_FSM_WRITESTART1
+ && fsm_state != HC_DBG_FSM_WRITESTART2
+ && fsm_state != HC_DBG_FSM_WRITECRC
+ && fsm_state != HC_DBG_FSM_WRITEWAIT1
+ && fsm_state != HC_DBG_FSM_WRITEWAIT2) {
+ hsts_err = mmio_read_32(reg_base + HC_HOSTSTATUS)
+ & HC_HSTST_MASK_ERROR_ALL;
+ if (hsts_err)
+ err = -(EILSEQ);
+ }
+
+ /* speeding up if the remaining words are not many */
+ remaining_words = (mmio_read_32(reg_base + HC_DEBUG) >> 4)
+ & HC_DBG_FIFO_THRESH_MASK;
+ if (remaining_words <= 4)
+ continue;
+
+ udelay(100);
+ }
+
+ /* We decide to stop by ourselves.
+ * It is because MMC_CMD(25) -> MMC_CMD(13) -> MMC_CMD(12)
+ * doesn't work for RPi3 SDHost.
+ */
+ if (rpi3_sdhost_params.current_cmd == MMC_CMD(25))
+ send_command_decorated(MMC_CMD(12), 0);
+
+ return err;
+}
+
+void rpi3_sdhost_init(struct rpi3_sdhost_params *params,
+ struct mmc_device_info *mmc_dev_info)
+{
+ assert((params != 0) &&
+ ((params->reg_base & MMC_BLOCK_MASK) == 0));
+
+ memcpy(&rpi3_sdhost_params, params, sizeof(struct rpi3_sdhost_params));
+
+ /* backup GPIO 48 to 53 configurations */
+ for (int i = 48; i <= 53; i++) {
+ rpi3_sdhost_params.gpio48_pinselect[i - 48]
+ = rpi3_gpio_get_select(i);
+ VERBOSE("rpi3_sdhost: Original GPIO state %d: %d\n",
+ i,
+ rpi3_sdhost_params.gpio48_pinselect[i - 48]);
+ }
+
+ /* setting pull resistors for 48 to 53.
+ * It is debatable to set SD_CLK to UP or NONE. We massively
+ * tested different brands of SD Cards and found NONE works
+ * most stable.
+ *
+ * GPIO 48 (SD_CLK) to GPIO_PULL_NONE
+ * GPIO 49 (SD_CMD) to GPIO_PULL_UP
+ * GPIO 50 (SD_D0) to GPIO_PULL_UP
+ * GPIO 51 (SD_D1) to GPIO_PULL_UP
+ * GPIO 52 (SD_D2) to GPIO_PULL_UP
+ * GPIO 53 (SD_D3) to GPIO_PULL_UP
+ */
+ gpio_set_pull(48, GPIO_PULL_NONE);
+ for (int i = 49; i <= 53; i++)
+ gpio_set_pull(i, GPIO_PULL_UP);
+
+ /* Set pin 48-53 to alt-0. It means route SDHOST to card slot */
+ for (int i = 48; i <= 53; i++)
+ rpi3_gpio_set_select(i, RPI3_GPIO_FUNC_ALT0);
+
+ mmc_init(&rpi3_sdhost_ops, params->clk_rate, params->bus_width,
+ params->flags, mmc_dev_info);
+}
+
+void rpi3_sdhost_stop(void)
+{
+ uintptr_t reg_base = rpi3_sdhost_params.reg_base;
+
+ VERBOSE("rpi3_sdhost: Shutting down: drain FIFO out\n");
+ rpi3_drain_fifo();
+
+ VERBOSE("rpi3_sdhost: Shutting down: slowing down the clock\n");
+ mmio_write_32(reg_base+HC_CLOCKDIVISOR, HC_CLOCKDIVISOR_SLOWVAL);
+ udelay(500);
+
+ VERBOSE("rpi3_sdhost: Shutting down: put SDHost into idle state\n");
+ send_command_decorated(MMC_CMD(0), 0);
+ udelay(500);
+
+ mmio_write_32(reg_base + HC_COMMAND, 0);
+ mmio_write_32(reg_base + HC_ARGUMENT, 0);
+ mmio_write_32(reg_base + HC_TIMEOUTCOUNTER, HC_TIMEOUT_IDLE);
+ mmio_write_32(reg_base + HC_CLOCKDIVISOR, HC_CLOCKDIVISOR_STOPVAL);
+
+ udelay(100);
+
+ mmio_write_32(reg_base + HC_POWER, 0);
+ mmio_write_32(reg_base + HC_HOSTCONFIG, 0);
+ mmio_write_32(reg_base + HC_BLOCKSIZE, 0x400);
+ mmio_write_32(reg_base + HC_BLOCKCOUNT, 0);
+ mmio_write_32(reg_base + HC_HOSTSTATUS, 0x7f8);
+
+ mmio_write_32(reg_base + HC_COMMAND, 0);
+ mmio_write_32(reg_base + HC_ARGUMENT, 0);
+
+ udelay(100);
+
+ /* Restore the pinmux to original state */
+ for (int i = 48; i <= 53; i++) {
+ rpi3_gpio_set_select(i,
+ rpi3_sdhost_params.gpio48_pinselect[i-48]);
+ }
+
+ /* Reset the pull resistors before entering BL33.
+ * GPIO 48 (SD_CLK) to GPIO_PULL_UP
+ * GPIO 49 (SD_CMD) to GPIO_PULL_UP
+ * GPIO 50 (SD_D0) to GPIO_PULL_UP
+ * GPIO 51 (SD_D1) to GPIO_PULL_UP
+ * GPIO 52 (SD_D2) to GPIO_PULL_UP
+ * GPIO 53 (SD_D3) to GPIO_PULL_UP
+ */
+ for (int i = 48; i <= 53; i++)
+ gpio_set_pull(i, GPIO_PULL_UP);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 14:26:04 +0000