[PATCH 2/2] drivers: mmc: add OpenPiton MMC support
Tianrui Wei
tianrui-wei at outlook.com
Tue Apr 20 12:14:59 CEST 2021
Hi Bin,
Thanks for the input, will fix as suggested.
Best regards,
Tianrui
> -----Original Message-----
> From: Bin Meng <bmeng.cn at gmail.com>
> Sent: Tuesday, April 20, 2021 5:42 PM
> To: Tianrui Wei <tianrui-wei at outlook.com>
> Cc: U-Boot Mailing List <u-boot at lists.denx.de>; Leo Yu-Chi Liang
> <ycliang at andestech.com>; Rick Chen <rick at andestech.com>; Pantelis
> Antoniou <panto at antoniou-consulting.com>
> Subject: Re: [PATCH 2/2] drivers: mmc: add OpenPiton MMC support
>
> On Tue, Apr 20, 2021 at 1:17 PM Tianrui Wei <tianrui-wei at outlook.com>
> wrote:
> >
> > From b8736bf498afc0d250228b0c29f1b402d0d58361 Mon Sep 17
> 00:00:00 2001
> > From: Tianrui Wei <tianrui-wei at outlook.com>
> > Date: Mon, 20 April 2021 13:03:25 +0800
> > Subject: [PATCH 2/2] drivers: mmc: add OpenPiton MMC support
> >
> > This patch enables support for OpenPiton MMC in u-boot
>
> nits: u-boot => U-Boot
>
> >
> > Signed-off-by: Tianrui Wei <tianrui-wei at outlook.com>
> > Acked-by: Jonathan Balkind <jbalkind at ucsb.edu>
> >
> > ---
> >
> > drivers/mmc/Kconfig | 5 +
> > drivers/mmc/Makefile | 1 +
> > drivers/mmc/piton_mmc.c | 184 ++++++++++++++++++++++++
> > 3 files changed, 190 insertions(+)
> > create mode 100644 drivers/mmc/piton_mmc.c
> >
> > diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
> > index 14d79139..8cbcd082 100644
> > --- a/drivers/mmc/Kconfig
> > +++ b/drivers/mmc/Kconfig
> > @@ -707,6 +707,11 @@ config MMC_SUNXI_HAS_MODE_SWITCH
> > bool
> > depends on MMC_SUNXI
> >
> > +config MMC_PITON
> > + bool "MMC support for openpiton SoC"
> > + help
> > + This driver enables sd card support in uboot port for openpiton
>
> uboot => U-Boot
>
> > +
> > config GENERIC_ATMEL_MCI
> > bool "Atmel Multimedia Card Interface support"
> > depends on DM_MMC && BLK && ARCH_AT91
> > diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
> > index 1c849cba..698dfe05 100644
> > --- a/drivers/mmc/Makefile
> > +++ b/drivers/mmc/Makefile
> > @@ -71,6 +71,7 @@ obj-$(CONFIG_MMC_SDHCI_XENON) +=
> xenon_sdhci.o
> > obj-$(CONFIG_MMC_SDHCI_ZYNQ) += zynq_sdhci.o
> >
> > obj-$(CONFIG_MMC_SUNXI) += sunxi_mmc.o
> > +obj-$(CONFIG_MMC_PITON) += piton_mmc.o
> > obj-$(CONFIG_MMC_UNIPHIER) += tmio-common.o uniphier-
> sd.o
> > obj-$(CONFIG_RENESAS_SDHI) += tmio-common.o renesas-
> sdhi.o
> > obj-$(CONFIG_MMC_BCM2835) += bcm2835_sdhost.o
> > diff --git a/drivers/mmc/piton_mmc.c b/drivers/mmc/piton_mmc.c
> > new file mode 100644
> > index 00000000..a749f30a
> > --- /dev/null
> > +++ b/drivers/mmc/piton_mmc.c
> > @@ -0,0 +1,184 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * (C) Copyright 2009 SAMSUNG Electronics
> > + * Minkyu Kang <mk7.kang at samsung.com>
> > + * Jaehoon Chung <jh80.chung at samsung.com>
> > + * Portions Copyright 2011-2019 NVIDIA Corporation
> > + * Portions Copyright 2021 Tianrui Wei
> > + * Tianrui Wei <tianrui-wei at outlook.com>
> > + */
> > +
> > +#include <asm/gpio.h>
> > +#include <asm/io.h>
> > +#include <common.h>
> > +#include <dm.h>
> > +#include <errno.h>
> > +#include <linux/bitops.h>
> > +#include <linux/types.h>
> > +#include <linux/delay.h>
> > +#include <linux/err.h>
> > +#include <log.h>
> > +#include <div64.h>
> > +#include <mmc.h>
> > +
> > +struct piton_mmc_plat {
> > + struct mmc_config cfg;
> > + struct mmc mmc;
> > +};
> > +
> > +struct piton_mmc_priv {
> > + u64 piton_mmc_base_addr; /* peripheral id */
> > +};
> > +
> > +// see mmc_read_blocks to see how it is used.
> > +// start block is hidden at cmd->arg
> > +// also, initialize the block size at init
>
> Don't use //
>
> > +static int piton_mmc_send_cmd(
> > + struct udevice *dev,
> > + struct mmc_cmd *cmd,
> > + struct mmc_data *data
> > +)
> > +{
> > + // check first if this is a pure command
> > + if (data == NULL) {
> > + return 0;
> > + }
> > +
> > + // byte count counts all the bytes required for this command
> > + u64 byte_cnt = data->blocks * data->blocksize;
> > + // get which block in mmc card to start from
> > + u64 start_block = cmd->cmdarg;
> > + // buff points to the address we store the data stored at mmc card
> > + unsigned *buff = (unsigned int *) data->dest;
> > +
> > + struct piton_mmc_priv *priv = dev_get_priv(dev);
> > + // start address denotes the absolute address where the
> transmission start
> > + u64 start_addr = priv->piton_mmc_base_addr + (start_block);
> > +
> > + /* if data is not empty*/
> > + if (data) {
> > +
> > + /* if there is a read */
> > + if (data->flags & MMC_DATA_READ) {
> > + for (u64 i = 0; i < byte_cnt; i += 4) {
> > + *(buff) = readl((void *)(start_addr + i));
> > + buff++;
> > + }
> > + } else {
> > + /* else there is a write
> > + * we don't handle write, so error right away
> > + */
> > + return -ENODEV;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int piton_mmc_ofdata_to_platdata(struct udevice *dev)
> > +{
> > + struct piton_mmc_priv *priv = dev_get_priv(dev);
> > + struct piton_mmc_plat *plat = dev_get_platdata(dev);
> > + struct mmc_config *cfg;
> > + struct mmc *mmc;
> > +
> > + priv->piton_mmc_base_addr = dev_read_addr(dev);
> > + cfg = &plat->cfg;
> > + cfg->name = "PITON MMC";
> > + cfg->host_caps = MMC_MODE_8BIT;
> > + cfg->f_max = 100000;
> > + cfg->f_min = 400000;
> > + cfg->voltages = MMC_VDD_21_22;
> > +
> > + mmc = &plat->mmc;
> > + mmc->read_bl_len = MMC_MAX_BLOCK_LEN;
> > + mmc->capacity_user = 0x100000000;
> > + mmc->capacity_user *= mmc->read_bl_len;
> > + mmc->capacity_boot = 0;
> > + mmc->capacity_rpmb = 0;
> > + for (int i = 0; i < 4; i++)
> > + mmc->capacity_gp[i] = 0;
> > + mmc->capacity = 0x2000000000ULL;
> > + mmc->has_init = 1;
> > +
> > + /* fill in device description */
> > + struct blk_desc *bdesc;
> > +
> > + bdesc = mmc_get_blk_desc(mmc);
> > + bdesc->lun = 0;
> > + bdesc->hwpart = 0;
> > + bdesc->type = 0;
> > + bdesc->blksz = mmc->read_bl_len;
> > + bdesc->log2blksz = LOG2(bdesc->blksz);
> > + bdesc->lba = lldiv(mmc->capacity, mmc->read_bl_len);
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * currently, this is ignored. we only use fixed speed
> > + */
> > +static int piton_mmc_set_ios(struct udevice *dev) { return 0; }
> > +
> > +/* test if piton has the micro mmc card present
> > + * always return 1, which means present
> > + */
> > +static int piton_mmc_getcd(struct udevice *dev) { return 1; }
> > +
> > +/* dummy function, piton_mmc don't need initialization in hw*/
> > +static int piton_mmc_init(struct udevice *dev) { return 0; }
> > +
> > +static const struct dm_mmc_ops piton_mmc_ops = {
> > + // send a command to mmc device
> > + .send_cmd = piton_mmc_send_cmd,
> > + // set iospeed
> > + .set_ios = piton_mmc_set_ios,
> > + // detect if card is present
> > + .get_cd = piton_mmc_getcd,
> > +};
> > +
> > +static int piton_mmc_probe(struct udevice *dev)
> > +{
> > + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
> > + struct piton_mmc_plat *plat = dev_get_platdata(dev);
> > + struct mmc_config *cfg = &plat->cfg;
> > +
> > + cfg->name = dev->name;
> > + upriv->mmc = &plat->mmc;
> > + upriv->mmc->has_init = 1;
> > + upriv->mmc->capacity = 0x2000000000ULL;
> > + upriv->mmc->read_bl_len = MMC_MAX_BLOCK_LEN;
> > +
> > + return piton_mmc_init(dev);
> > +}
> > +
> > +static int piton_mmc_bind(struct udevice *dev)
> > +{
> > + struct piton_mmc_plat *plat = dev_get_platdata(dev);
> > + struct mmc_config *cfg = &plat->cfg;
> > +
> > + cfg->name = dev->name;
> > + cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS |
> MMC_MODE_8BIT;
> > + cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 |
> MMC_VDD_33_34;
> > + cfg->f_min = 1000000;
> > + cfg->f_max = 52000000;
> > + cfg->b_max = U32_MAX;
> > +
> > + return mmc_bind(dev, &plat->mmc, cfg);
> > +}
> > +
> > +static const struct udevice_id piton_mmc_ids[] = {
> > + {.compatible = "openpiton,piton-mmc"}, {}
>
> nits: please put {} on a separate line
>
> > +};
> > +
> > +U_BOOT_DRIVER(piton_mmc_drv) = {
> > + .name = "piton_mmc",
> > + .id = UCLASS_MMC,
> > + .of_match = piton_mmc_ids,
> > + .ofdata_to_platdata = piton_mmc_ofdata_to_platdata,
> > + .bind = piton_mmc_bind,
> > + .probe = piton_mmc_probe,
> > + .ops = &piton_mmc_ops,
> > + .platdata_auto_alloc_size = sizeof(struct piton_mmc_plat),
> > + .priv_auto_alloc_size = sizeof(struct piton_mmc_priv),
> > +};
> > --
>
> Regards,
> Bin
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