[PATCH] Added sd driver for bcm2835 (Raspberry PI)
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Tue Apr 23 10:43:55 EDT 2013
On 15:41 Tue 23 Apr , wilhelm wrote:
> ---
> arch/arm/mach-bcm2835/core.c | 1 +
> drivers/mci/Kconfig | 5 +
> drivers/mci/Makefile | 1 +
> drivers/mci/mci-bcm2835.c | 551 +++++++++++++++++++++++++++++++++++++++++++
> drivers/mci/mci-bcm2835.h | 126 ++++++++++
> 5 files changed, 684 insertions(+)
> create mode 100644 drivers/mci/mci-bcm2835.c
> create mode 100644 drivers/mci/mci-bcm2835.h
>
> diff --git a/arch/arm/mach-bcm2835/core.c b/arch/arm/mach-bcm2835/core.c
> index f44ecd5..906e434 100644
> --- a/arch/arm/mach-bcm2835/core.c
> +++ b/arch/arm/mach-bcm2835/core.c
> @@ -70,6 +70,7 @@ static int bcm2835_dev_init(void)
> {
> add_generic_device("bcm2835-gpio", 0, NULL, BCM2835_GPIO_BASE, 0xB0, IORESOURCE_MEM, NULL);
> add_generic_device("bcm2835-cs", DEVICE_ID_SINGLE, NULL, BCM2835_ST_BASE, 0x1C, IORESOURCE_MEM, NULL);
> + add_generic_device("bcm2835_mci", 0, NULL, BCM2835_EMMC_BASE, 0xFC, IORESOURCE_MEM, NULL);
> return 0;
> }
> coredevice_initcall(bcm2835_dev_init);
> diff --git a/drivers/mci/Kconfig b/drivers/mci/Kconfig
> index 9558f28..74ca93e 100644
> --- a/drivers/mci/Kconfig
> +++ b/drivers/mci/Kconfig
> @@ -45,6 +45,11 @@ config MCI_S3C
> Enable this entry to add support to read and write SD cards on a
> Samsung S3C24xx based system.
>
> +config MCI_BCM2835
> + bool "MCI support for BCM2835"
> + depends on ARCH_BCM2835
> +
> +
drop one
> config MCI_IMX
> bool "i.MX"
> depends on ARCH_IMX27 || ARCH_IMX31
> diff --git a/drivers/mci/Makefile b/drivers/mci/Makefile
> index d46d5f5..263f23a 100644
> --- a/drivers/mci/Makefile
> +++ b/drivers/mci/Makefile
> @@ -8,3 +8,4 @@ obj-$(CONFIG_MFD_TWL6030) += twl6030.o
> obj-$(CONFIG_MCI_PXA) += pxamci.o
> obj-$(CONFIG_MCI_ATMEL) += atmel_mci.o
> obj-$(CONFIG_MCI_SPI) += mci_spi.o
> +obj-$(CONFIG_MCI_BCM2835) += mci-bcm2835.o
> diff --git a/drivers/mci/mci-bcm2835.c b/drivers/mci/mci-bcm2835.c
> new file mode 100644
> index 0000000..29afe0c
> --- /dev/null
> +++ b/drivers/mci/mci-bcm2835.c
> @@ -0,0 +1,551 @@
> +/*
> + * Raspberry PI MCI driver
> + *
> + * Portions (e.g. read/write macros, concepts for back-to-back register write
> + * timing workarounds) obviously extracted from the Linux kernel at:
> + * https://github.com/raspberrypi/linux.git rpi-3.6.y
> + *
> + * The Linux kernel code has the following (c) and license, which is hence
> + * propagated to here:
> + *
> + * Support for SDHCI device on 2835
> + * Based on sdhci-bcm2708.c (c) 2010 Broadcom
> + * Inspired by bcm2835_sdhci.c from git://github.com/gonzoua/u-boot-pi.git
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <mci.h>
> +#include <io.h>
> +#include <malloc.h>
> +#include <clock.h>
> +#include "mci-bcm2835.h"
> +
> +#define to_bcm2835_host(h) container_of(h, struct bcm2835_mci_host, mci)
> +static int twoticks_delay;
> +struct bcm2835_mci_host {
> + struct mci_host mci;
> + void __iomem *regs;
> + struct device_d *hw_dev;
> + int bus_width:2; /* 0 = 1 bit, 1 = 4 bit, 2 = 8 bit */
no this optimise nothing just use a int or a u8
> + u32 clock; /* current clock in Hz */
> + u32 max_clock;
> + u32 version;
> +};
> +
> +void bcm2835_mci_write(struct bcm2835_mci_host *host, u32 reg, u32 val)
> +{
> + static uint64_t last_write;
no store this in the host struct
> + /*
> + * The Arasan has a bugette whereby it may lose the content of
> + * successive writes to registers that are within two SD-card clock
> + * cycles of each other (a clock domain crossing problem).
> + * It seems, however, that the data register does not have this problem.
> + * (Which is just as well - otherwise we'd have to nobble the DMA engine
> + * too)
> + */
> +
> + if (last_write != 0)
> + while ((get_time_ns() - last_write) < twoticks_delay)
> + ;
> + last_write = get_time_ns();
> + reg = (u32) (host->regs) + reg;
> + writel(val, reg);
> +}
> +
> +u32 bcm2835_mci_read(struct bcm2835_mci_host *host, u32 reg)
> +{
> + reg = (u32) (host->regs) + reg;
> + return readl(reg);
jsut do readl(host->regs + reg)
> +}
> +
> +static int bcm2835_mci_transfer_data(struct bcm2835_mci_host *host,
> + struct mci_cmd *cmd, struct mci_data *data) {
> + uint32_t *p;
> + u32 data_size, status, int_status = 0;
> + u32 data_ready_int_mask;
> + u32 data_ready_status_mask;
> + int i = 0;
> +
> + data_size = data->blocksize * data->blocks;
> +
> + if (data->flags & MMC_DATA_READ) {
> + p = (uint32_t *) data->dest;
> + data_ready_int_mask = INT_DATA_READ_RDY;
> + data_ready_status_mask = STATUS_READ_OK;
> + } else {
> + p = (uint32_t *) data->src;
> + data_ready_int_mask = INT_DATA_WRITE_RDY;
> + data_ready_status_mask = STATUS_WRITE_OK;
> + }
> + do {
> + int_status = bcm2835_mci_read(host, BCM2835_MCI_INTERRUPT);
one missing blank line
> + if (int_status & INT_ERROR_OCCURED) {
> + dev_err(host->hw_dev,
> + "Error occured while transferring data: 0x%X\n",
> + int_status);
> + return -1;
use proper err value
> + }
> + if (int_status & data_ready_int_mask) {
> + status = bcm2835_mci_read(host, BCM2835_MCI_STATUS);
> + if ((status & data_ready_status_mask) == 0)
> + continue;
> + /*Clear latest int and transfer one block size of data*/
> + bcm2835_mci_write(host, BCM2835_MCI_INTERRUPT,
> + data_ready_int_mask);
> + for (i = 0; i < data->blocksize; i += 4) {
> + if (data->flags == MMC_DATA_READ)
> + *p = bcm2835_mci_read(
> + host, BCM2835_MCI_DATA);
> + else
use a function pointer may speed the read/write and drop the if/else
> + bcm2835_mci_write(host,
> + BCM2835_MCI_DATA,
> + *p);
> + p++;
> + data_size -= 4;
> + }
> + }
> + } while ((int_status & INT_DATA_DONE) == 0);
> +
> + if (data_size != 0) {
> + if (data->flags & MMC_DATA_READ)
> + dev_err(host->hw_dev, "Error while reading:\n");
> + else
> + dev_err(host->hw_dev, "Error while writing:\n");
> + dev_err(host->hw_dev, "Transferred %d bytes of data, wanted %d\n",
> + (data->blocksize * data->blocks) - data_size,
> + data->blocksize * data->blocks);
> + dev_err(host->hw_dev, "Status: 0x%X, Interrupt: 0x%X\n",
> + bcm2835_mci_read(host, BCM2835_MCI_STATUS),
> + bcm2835_mci_read(host, BCM2835_MCI_INTERRUPT));
> + return -1;
proper -Exxx
> + }
> + return 0;
> +}
> +
> +static u32 wait_command_done(struct bcm2835_mci_host *host)
> +{
> + u32 interrupt = 0;
missing empty line
> + while (true) {
> + interrupt = bcm2835_mci_read(
> + host, BCM2835_MCI_INTERRUPT);
> + if (interrupt & INT_ERROR_OCCURED)
> + return -1;
proper -Exxx
> + if (interrupt & INT_CMD_DONE)
> + break;
> + }
> + return 0;
> +}
> +
> +static void reset_emmc(struct bcm2835_mci_host *host, u32 reset, u32 wait_for)
always prefix the function with drviers name (or short name)
> +{
> + u32 ret;
> + u32 current = bcm2835_mci_read(host, BCM2835_MCI_CONTROL1);
missing empty line
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, current | reset);
> +
> + while (true) {
> + ret = bcm2835_mci_read(host, BCM2835_MCI_CONTROL1);
> + if (ret & wait_for)
> + continue;
> + break;
> + }
> +}
> +
> +/**
> + * Process one command to the MCI card
> + * @param host MCI host
> + * @param cmd The command to process
> + * @param data The data to handle in the command (can be NULL)
> + * @return 0 on success, negative value else
> + */
> +static int bcm2835_mci_request(struct mci_host *mci, struct mci_cmd *cmd,
> + struct mci_data *data) {
> + u32 command, block_data = 0, ret = 0;
> + u32 wait_inhibit_mask = STATUS_CMD_INHIBIT | STATUS_DAT_INHIBIT;
> +
> + struct bcm2835_mci_host *host = to_bcm2835_host(mci);
> +
> + command = (cmd->cmdidx << CMD_SHIFT);
> +
> + if (cmd->resp_type != 0) {
> + if (cmd->resp_type & MMC_RSP_136)
> + command |= CMD_RESP_LEN_136;
if {} else {}
> + else {
> + if (cmd->resp_type & MMC_RSP_BUSY)
> + command |= CMD_RESP_LEN_48_BSY;
> + else
> + command |= CMD_RESP_LEN_48;
> + }
> + if (cmd->resp_type & MMC_RSP_CRC)
> + command |= CMD_RESP_CRC_CHK;
> + }
> + if (data != NULL) {
> + command |= CMD_IS_DATA | CMD_ENA_BLK_CNT;
> +
> + if (data->blocks > 1)
> + command |= CMD_MULTI_BLK;
> +
> + if (data->flags & MMC_DATA_READ)
> + command |= CMD_CARD_TO_HOST;
> +
> + block_data = (data->blocks << BLOCK_SHIFT);
> + block_data |= data->blocksize;
> +
drop it
> + }
> +
> + if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
> + wait_inhibit_mask = STATUS_CMD_INHIBIT;
> +
> + /*Wait for old command*/
> + while (bcm2835_mci_read(host, BCM2835_MCI_STATUS)
> + & wait_inhibit_mask)
> + ;
> +
> + bcm2835_mci_write(host, BCM2835_MCI_IRPT_MASK, 0xFFFFFFFF);
> + bcm2835_mci_write(host, BCM2835_MCI_INTERRUPT, 0xFFFFFFFF);
> +
> + bcm2835_mci_write(host, BCM2835_MCI_BLKSIZECNT, block_data);
> + bcm2835_mci_write(host, BCM2835_MCI_ARG1, cmd->cmdarg);
> + bcm2835_mci_write(host, BCM2835_MCI_CMDTM, command);
> +
> + ret = wait_command_done(host);
> + if (ret == -1) {
if (ret) as 0 meeans success
> + dev_err(host->hw_dev, "Error while executing command %d\n",
> + cmd->cmdidx);
> + dev_err(host->hw_dev, "Status: 0x%X, Interrupt: 0x%X\n",
> + bcm2835_mci_read(host, BCM2835_MCI_STATUS),
> + bcm2835_mci_read(host, BCM2835_MCI_INTERRUPT));
> + }
> + if (cmd->resp_type != 0 && ret != -1) {
> + int i = 0;
missing empty line
> + /* CRC is stripped so we need to do some shifting. */
> + if (cmd->resp_type & MMC_RSP_136) {
> + for (i = 0; i < 4; i++) {
> + cmd->response[i] = bcm2835_mci_read(
> + host,
> + BCM2835_MCI_RESP0 + (3 - i) * 4) << 8;
> + if (i != 3)
> + cmd->response[i] |=
> + readb((u32) (host->regs) +
> + BCM2835_MCI_RESP0 +
> + (3 - i) * 4 - 1);
> + }
> + } else
> + cmd->response[0] = bcm2835_mci_read(
> + host, BCM2835_MCI_RESP0);
{}
> + bcm2835_mci_write(host, BCM2835_MCI_INTERRUPT,
> + INT_CMD_DONE);
> + }
> +
> + if (ret != -1 && data != NULL)
> + ret = bcm2835_mci_transfer_data(host, cmd, data);
if (ret && !data)
> +
> + bcm2835_mci_write(host, BCM2835_MCI_INTERRUPT, 0xFFFFFFFF);
> + if (ret == -1) {
if (ret)
> + reset_emmc(host, CONTROL1_CMDRST, CONTROL1_CMDRST);
> + reset_emmc(host, CONTROL1_DATARST, CONTROL1_DATARST);
> + }
> +
> + return ret;
> +}
> +
> +static u32 get_clock_divider(struct bcm2835_mci_host *host, u32 desired_hz)
> +{
> + u32 div;
> + u32 clk_hz;
> +
> + if (host->version >= SDHCI_SPEC_300) {
> + /* Version 3.00 divisors must be a multiple of 2. */
> + if (host->max_clock <= desired_hz)
> + div = 1;
> + else {
> + for (div = 2; div < MAX_CLK_DIVIDER_V3; div += 2) {
> + clk_hz = host->max_clock / div;
> + if (clk_hz <= desired_hz)
> + break;
> + }
> + }
> + } else {
> + /* Version 2.00 divisors must be a power of 2. */
> + for (div = 1; div < MAX_CLK_DIVIDER_V2; div *= 2) {
> + clk_hz = host->max_clock / div;
> + if (clk_hz <= desired_hz)
> + break;
> + }
> +
> + }
> +
> + /*Since setting lowest bit means divide by two, shift down*/
> + dev_dbg(host->hw_dev,
> + "Wanted %d hz, returning divider %d (%d) which yields %d hz\n",
> + desired_hz, div >> 1, div, host->max_clock / div);
> + twoticks_delay = ((2 * 1000000000) / (host->max_clock / div)) + 1;
> +
> + div = div >> 1;
> + host->clock = desired_hz;
> + return div;
> +}
> +
> +/**
> + * Setup the bus width and IO speed
> + * @param host MCI host
> + * @param bus_width New bus width value (1, 4 or 8)
> + * @param clock New clock in Hz (can be '0' to disable the clock)
> + */
> +static void bcm2835_mci_set_ios(struct mci_host *mci, struct mci_ios *ios)
> +{
> + u32 divider;
> + u32 divider_msb, divider_lsb;
> + u32 enable;
> +
> + struct bcm2835_mci_host *host = to_bcm2835_host(mci);
> +
> + switch (ios->bus_width) {
> + case MMC_BUS_WIDTH_4:
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL0,
> + bcm2835_mci_read(host,
> + BCM2835_MCI_CONTROL0) |
> + CONTROL0_4DATA);
> + host->bus_width = 1;
> + dev_dbg(host->hw_dev, "Changing bus width to 4\n");
> + break;
> + case MMC_BUS_WIDTH_1:
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL0,
> + bcm2835_mci_read(host,
> + BCM2835_MCI_CONTROL0) &
> + ~CONTROL0_4DATA);
> + host->bus_width = 0;
> + dev_dbg(host->hw_dev, "Changing bus width to 1\n");
> + break;
> + default:
> + return;
err?
> + }
> + if (ios->clock != host->clock && ios->clock != 0) {
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, 0x00);
> +
> + if (ios->clock > 26000000) {
> + enable = bcm2835_mci_read(
> + host, BCM2835_MCI_CONTROL0);
> + enable = enable | CONTROL0_HISPEED;
|=
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1,
> + enable);
> + }
> +
> + divider = get_clock_divider(host, ios->clock);
> + divider_msb = divider & 0x300;
> + divider_msb = divider_msb >> CONTROL1_CLKLSB;
>>=
> + divider_lsb = divider & 0xFF;
> + enable = (divider_lsb << CONTROL1_CLKLSB);
> + enable |= (divider_msb << CONTROL1_CLKMSB);
> + enable |= CONTROL1_INTCLKENA | CONTROL1_TIMEOUT;
> +
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, enable);
> + while (true) {
> + u32 ret = bcm2835_mci_read(
> + host, BCM2835_MCI_CONTROL1);
> + if (ret & CONTROL1_CLK_STABLE)
> + break;
> + }
do {}while() will be cleaner
> +
> + enable |= CONTROL1_CLKENA;
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, enable);
> +
> + mdelay(100);
why??
> +
> + reset_emmc(host, CONTROL1_CMDRST, CONTROL1_CMDRST);
> + reset_emmc(host, CONTROL1_DATARST, CONTROL1_DATARST);
> +
> + host->clock = ios->clock;
> + }
> + dev_dbg(host->hw_dev, "IO settings: bus width=%d, frequency=%u Hz\n",
> + host->bus_width, host->clock);
> +}
> +
> +int bcm2835_mci_reset(struct mci_host *mci, struct device_d *mci_dev)
> +{
> + struct bcm2835_mci_host *host;
> + u32 ret = 0;
> + u32 reset = CONTROL1_HOSTRST | CONTROL1_CMDRST | CONTROL1_DATARST;
> + u32 enable = 0;
> + u32 divider;
> + u32 divider_msb, divider_lsb;
> +
> + host = to_bcm2835_host(mci);
> + divider = get_clock_divider(host, MIN_FREQ);
> + divider_msb = divider & 0x300;
> + divider_msb = divider_msb >> CONTROL1_CLKLSB;
> + divider_lsb = divider & 0xFF;
> +
> + enable = (divider_lsb << CONTROL1_CLKLSB);
> + enable |= (divider_msb << CONTROL1_CLKMSB);
> + enable |= CONTROL1_INTCLKENA | CONTROL1_TIMEOUT;
> +
> + reset_emmc(host, enable | reset, CONTROL1_HOSTRST);
> +
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL0, 0x00);
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL2, 0x00);
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, enable);
> + while (true) {
> + ret = bcm2835_mci_read(host, BCM2835_MCI_CONTROL1);
> + if (ret & CONTROL1_CLK_STABLE)
> + break;
> + }
> +
> + enable |= CONTROL1_CLKENA;
> + bcm2835_mci_write(host, BCM2835_MCI_CONTROL1, enable);
> +
> + mdelay(100);
> +
> + bcm2835_mci_write(host, BCM2835_MCI_IRPT_MASK,
> + 0xFFFFFFFF);
> + bcm2835_mci_write(host, BCM2835_MCI_INTERRUPT,
> + 0xFFFFFFFF);
> +
> + /*Now write command 0 and see if we get response*/
> + bcm2835_mci_write(host, BCM2835_MCI_ARG1, 0x0);
> + bcm2835_mci_write(host, BCM2835_MCI_CMDTM, 0x0);
> + ret = wait_command_done(host);
jsut return
> + return ret;
> +}
> +
> +static int bcm2835_mci_card_present(struct mci_host *mci)
> +{
> + /*just assume a card is always present*/
> + return 1;
> +}
do not provide ti so
> +
> +static u32 get_mailbox_emmc_cloc(struct msg_get_clock_rate *clk_data)
> +{
> + u32 val;
> + struct bcm2835_mbox_regs *regs =
> + (struct bcm2835_mbox_regs *) BCM2835_MBOX_PHYSADDR;
> +
> + /*Read out old msg*/
> + for (;;) {
> + val = readl(®s->status);
> + if (val & BCM2835_MBOX_STATUS_RD_EMPTY)
> + break;
> + val = readl(®s->read);
> + }
be consistant int he driver for (;;) or while(1)
> +
> + /*Check for ok to write*/
> + for (;;) {
> + val = readl(®s->status);
> + if (!(val & BCM2835_MBOX_STATUS_WR_FULL))
> + break;
> + }
> + val = BCM2835_MBOX_PROP_CHAN + ((u32) &clk_data->hdr);
> + writel(val, ®s->write);
> +
> + while (true) {
> + /* Wait for the response */
> + for (;;) {
> + val = readl(®s->status);
> + if (!(val & BCM2835_MBOX_STATUS_RD_EMPTY))
> + break;
> + }
> +
> + /* Read the response */
> + val = readl(®s->read);
> + if ((val & 0x0F) == BCM2835_MBOX_PROP_CHAN)
> + break;
> + }
> + if ((val & ~0x0F) == ((u32) &clk_data->hdr))
> + if (clk_data->get_clock_rate.tag_hdr.val_len
> + & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE)
> + return 1;
> + return 0;
> +}
> +
> +static int bcm2835_mci_probe(struct device_d *hw_dev)
> +{
> + struct bcm2835_mci_host *host;
> + struct resource *res;
> + struct msg_get_clock_rate *clk_data;
> +
> + host = xzalloc(sizeof(*host));
> + host->mci.send_cmd = bcm2835_mci_request;
> + host->mci.set_ios = bcm2835_mci_set_ios;
> + host->mci.init = bcm2835_mci_reset;
> + host->mci.card_present = bcm2835_mci_card_present;
> + host->mci.hw_dev = hw_dev;
> + host->hw_dev = hw_dev;
> +
> + clk_data = memalign(16, sizeof(struct msg_get_clock_rate));
why 11 align
> + memset(clk_data, 0, sizeof(struct msg_get_clock_rate));
> + clk_data->hdr.buf_size = sizeof(struct msg_get_clock_rate);
> + clk_data->get_clock_rate.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
> + clk_data->get_clock_rate.tag_hdr.val_buf_size =
> + sizeof(clk_data->get_clock_rate.body);
> + clk_data->get_clock_rate.tag_hdr.val_len =
> + sizeof(clk_data->get_clock_rate.body.req);
> + clk_data->get_clock_rate.body.req.clock_id = BCM2835_MBOX_CLOCK_ID_EMMC;
> +
> + if (!get_mailbox_emmc_cloc(clk_data)) {
> + dev_warn(host->hw_dev,
> + "Failed getting emmc clock, lets go anyway with 50MHz\n");
> + host->max_clock = 50000000;
> + } else {
> + host->max_clock = clk_data->get_clock_rate.body.resp.rate_hz;
> + dev_info(host->hw_dev, "Got emmc clock at %d Hz\n",
> + host->max_clock);
> + }
> +
> + host->regs = dev_request_mem_region(hw_dev, 0);
> + if (host->regs == NULL) {
> + dev_err(host->hw_dev, "Failed request mem region, aborting...\n");
> + return -1;
> + }
> +
> + res = dev_get_resource(hw_dev, 0);
why that?
> +
> + host->mci.host_caps |= MMC_MODE_4BIT | MMC_MODE_HS | MMC_MODE_HS_52MHz;
> +
> + host->mci.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
> +
> + host->mci.f_min = MIN_FREQ;
> + host->mci.f_max = host->max_clock;
> +
> + /*
> + * The Arasan has a bugette whereby it may lose the content of
> + * successive writes to registers that are within two SD-card clock
> + * cycles of each other (a clock domain crossing problem).
> + *
> + * 1/MIN_FREQ is (max) time per tick of eMMC clock.
> + * 2/MIN_FREQ is time for two ticks.
> + * Multiply by 1000000000 to get nS per two ticks.
> + * +1 for hack rounding.
> + */
> +
> + twoticks_delay = ((2 * 1000000000) / MIN_FREQ) + 1;
> +
> + host->version = bcm2835_mci_read(
> + host, BCM2835_MCI_SLOTISR_VER);
> + host->version = (host->version >> 16) & 0xFF;
> + mci_register(&host->mci);
> + return 0;
> +}
> +
> +static struct driver_d bcm2835_mci_driver = {
> + .name = "bcm2835_mci",
> + .probe = bcm2835_mci_probe,
> +};
> +
> +static int bcm2835_mci_add(void)
> +{
> + return platform_driver_register(&bcm2835_mci_driver);
> +}
> +coredevice_initcall(bcm2835_mci_add);
> diff --git a/drivers/mci/mci-bcm2835.h b/drivers/mci/mci-bcm2835.h
> new file mode 100644
> index 0000000..bd1709d
> --- /dev/null
> +++ b/drivers/mci/mci-bcm2835.h
> @@ -0,0 +1,126 @@
> +#define BCM2835_MCI_ARG2 0x0
> +#define BCM2835_MCI_BLKSIZECNT 0x4
> +#define BCM2835_MCI_ARG1 0x8
> +#define BCM2835_MCI_CMDTM 0xc
> +#define BCM2835_MCI_RESP0 0x10
> +#define BCM2835_MCI_RESP1 0x14
> +#define BCM2835_MCI_RESP2 0x18
> +#define BCM2835_MCI_RESP3 0x1c
> +#define BCM2835_MCI_DATA 0x20
> +#define BCM2835_MCI_STATUS 0x24
> +#define BCM2835_MCI_CONTROL0 0x28
> +#define BCM2835_MCI_CONTROL1 0x2c
> +#define BCM2835_MCI_INTERRUPT 0x30
> +#define BCM2835_MCI_IRPT_MASK 0x34
> +#define BCM2835_MCI_IRPT_EN 0x38
> +#define BCM2835_MCI_CONTROL2 0x3c
> +#define BCM2835_MCI_FORCE_IRPT 0x50
> +#define BCM2835_MCI_BOOT_TIMEOUT 0x70
> +#define BCM2835_MCI_DBG_SEL 0x74
> +#define BCM2835_MCI_EXRDFIFO_CFG 0x80
> +#define BCM2835_MCI_EXRDFIFO_EN 0x84
> +#define BCM2835_MCI_TUNE_STEP 0x88
> +#define BCM2835_MCI_TUNE_STEPS_STD 0x8c
> +#define BCM2835_MCI_TUNE_STEPS_DDR 0x90
> +#define BCM2835_MCI_SPI_INT_SPT 0xf0
> +#define BCM2835_MCI_SLOTISR_VER 0xfc
> +
> +#define MIN_FREQ 400000
> +
> +#define SDHCI_SPEC_100 0
> +#define SDHCI_SPEC_200 1
> +#define SDHCI_SPEC_300 2
> +
> +
> +#define CONTROL0_SPIMODE (1 << 20)
> +#define CONTROL0_HISPEED (1 << 2)
> +#define CONTROL0_4DATA (1 << 1)
> +
> +#define CONTROL1_DATARST (1 << 26)
> +#define CONTROL1_CMDRST (1 << 25)
> +#define CONTROL1_HOSTRST (1 << 24)
> +#define CONTROL1_CLKSELPROG (1 << 5)
> +#define CONTROL1_CLKENA (1 << 2)
> +#define CONTROL1_CLK_STABLE (1 << 1)
> +#define CONTROL1_INTCLKENA (1 << 0)
> +#define CONTROL1_CLKMSB 6
> +#define CONTROL1_CLKLSB 8
> +#define CONTROL1_TIMEOUT (0x0E << 16)
> +
> +#define MAX_CLK_DIVIDER_V3 2046
> +#define MAX_CLK_DIVIDER_V2 256
> +
> +#define INT_DATA_READ_RDY (1 << 5)
> +#define INT_DATA_WRITE_RDY (1 << 4)
> +#define INT_DATA_DONE (1 << 1)
> +#define INT_CMD_DONE (1 << 0)
> +#define INT_ERROR_OCCURED (1 << 15)
> +#define INT_BLOCK_GAP (1 << 2)
> +
> +
> +#define BLOCK_SHIFT 16
> +
> +#define CMD_SHIFT 24
> +#define CMD_IS_DATA (1 << 21)
> +#define CMD_CHECK_CRC (1 << 19)
> +#define CMD_CARD_TO_HOST (1 << 4)
> +#define CMD_ENA_BLK_CNT (1 << 1)
> +#define CMD_MULTI_BLK (1 << 5)
> +#define CMD_RESP_LEN_136 (1 << 16)
> +#define CMD_RESP_LEN_48 (1 << 17)
> +#define CMD_RESP_LEN_48_BSY (0x03 << 16)
> +#define CMD_RESP_CRC_CHK (1 << 19)
> +
> +#define STATUS_READ_OK (1 << 11)
> +#define STATUS_WRITE_OK (1 << 10)
> +#define STATUS_CMD_INHIBIT (1 << 0)
> +#define STATUS_DAT_INHIBIT (1 << 1)
> +
> +
> +/*this is only for mbox comms*/
> +#define BCM2835_MBOX_PHYSADDR 0x2000b880
> +#define BCM2835_MBOX_TAG_GET_CLOCK_RATE 0x00030002
> +#define BCM2835_MBOX_CLOCK_ID_EMMC 1
> +#define BCM2835_MBOX_STATUS_WR_FULL 0x80000000
> +#define BCM2835_MBOX_STATUS_RD_EMPTY 0x40000000
> +#define BCM2835_MBOX_PROP_CHAN 8
> +#define BCM2835_MBOX_TAG_VAL_LEN_RESPONSE 0x80000000
> +
> +struct bcm2835_mbox_regs {
> + u32 read;
> + u32 rsvd0[5];
> + u32 status;
> + u32 config;
> + u32 write;
> +};
> +
> +
> +struct bcm2835_mbox_hdr {
> + u32 buf_size;
> + u32 code;
> +};
> +
> +struct bcm2835_mbox_tag_hdr {
> + u32 tag;
> + u32 val_buf_size;
> + u32 val_len;
> +};
> +
> +struct bcm2835_mbox_tag_get_clock_rate {
> + struct bcm2835_mbox_tag_hdr tag_hdr;
> + union {
> + struct {
> + u32 clock_id;
> + } req;
> + struct {
> + u32 clock_id;
> + u32 rate_hz;
> + } resp;
> + } body;
> +};
> +
> +struct msg_get_clock_rate {
> + struct bcm2835_mbox_hdr hdr;
> + struct bcm2835_mbox_tag_get_clock_rate get_clock_rate;
> + u32 end_tag;
> +};
> --
> 1.8.2
>
>
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