This commit adds support to piton_mmc driver for OpenPiton-riscv64 This driver has many things set as preconfigured because the hardware automatically configures most of the settings during startup.
- V6 . change type of address . move declarations ahead . loop style update - V7 . dm updates . fix indentations . style fixes to improve readability . add write support for mmc cards - V8 . update variable namings and comments for clarity
Signed-off-by: Tianrui Wei tianrui-wei@outlook.com Signed-off-by: Jonathan Balkind jbalkind@ucsb.edu --- drivers/mmc/Kconfig | 9 +++ drivers/mmc/Makefile | 1 + drivers/mmc/piton_mmc.c | 161 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 171 insertions(+) create mode 100644 drivers/mmc/piton_mmc.c
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 8901456967..4948e194e7 100644 --- a/drivers/mmc/Kconfig +++ b/drivers/mmc/Kconfig @@ -727,6 +727,15 @@ config MMC_SUNXI_HAS_MODE_SWITCH bool depends on MMC_SUNXI
+config MMC_PITON + bool "MMC support for OpenPiton SoC" + depends on DM_MMC && BLK + help + This selects support for the SD host controller on OpenPiton SoC. + Note that this SD controller directly exposes the contents of the + SD card as memory mapped, so there is no manual configuration + required + 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 89d6af3db3..d96ac90719 100644 --- a/drivers/mmc/Makefile +++ b/drivers/mmc/Makefile @@ -72,6 +72,7 @@ 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 0000000000..9f5da6d633 --- /dev/null +++ b/drivers/mmc/piton_mmc.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2009 SAMSUNG Electronics + * Minkyu Kang mk7.kang@samsung.com + * Jaehoon Chung jh80.chung@samsung.com + * Portions Copyright 2011-2019 NVIDIA Corporation + * Portions Copyright 2021 Tianrui Wei + * This file is adapted from tegra_mmc.c + * Tianrui Wei tianrui-wei@outlook.com + */ + +#include <asm/gpio.h> +#include <asm/io.h> +#include <common.h> +#include <div64.h> +#include <dm.h> +#include <errno.h> +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/types.h> +#include <linux/sizes.h> +#include <log.h> +#include <mmc.h> + + +#define PITON_MMC_DUMMY_F_MAX 20000000 +#define PITON_MMC_DUMMY_F_MIN 10000000 +#define PITON_MMC_DUMMY_CAPACITY SZ_4G << 3 +#define PITON_MMC_DUMMY_B_MAX SZ_4G + +struct piton_mmc_plat { + struct mmc_config cfg; + struct mmc mmc; +}; + +struct piton_mmc_priv { + void __iomem *base_addr; +}; + +static int piton_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd, + struct mmc_data *data) +{ + if (!data) + return 0; + + struct piton_mmc_priv *priv = dev_get_priv(dev); + u32 *buff, *start_addr, *write_src; + size_t byte_cnt, start_block; + + buff = (u32 *)data->dest; + write_src = (u32 *)data->src; + start_block = cmd->cmdarg; + start_addr = priv->base_addr + start_block; + + /* if there is a read */ + for (byte_cnt = data->blocks * data->blocksize; byte_cnt; + byte_cnt -= sizeof(u32)) { + if (data->flags & MMC_DATA_READ) { + *buff++ = readl(start_addr++); + } + else if (data->flags & MMC_DATA_WRITE) { + writel(*write_src++,start_addr++); + } + } + 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_plat(dev); + struct mmc_config *cfg; + struct mmc *mmc; + struct blk_desc *bdesc; + + priv->base_addr = (void *)dev_read_addr(dev); + cfg = &plat->cfg; + cfg->name = "PITON MMC"; + cfg->host_caps = MMC_MODE_8BIT; + cfg->f_max = PITON_MMC_DUMMY_F_MAX; + cfg->f_min = PITON_MMC_DUMMY_F_MIN; + cfg->voltages = MMC_VDD_21_22; + + mmc = &plat->mmc; + mmc->read_bl_len = MMC_MAX_BLOCK_LEN; + mmc->capacity_user = PITON_MMC_DUMMY_CAPACITY; + 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 = PITON_MMC_DUMMY_CAPACITY; + mmc->has_init = 1; + + 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; +} + +static int piton_mmc_getcd(struct udevice *dev) +{ + return 1; +} + +static const struct dm_mmc_ops piton_mmc_ops = { + .send_cmd = piton_mmc_send_cmd, + .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_plat(dev); + struct mmc_config *cfg = &plat->cfg; + + cfg->name = dev->name; + upriv->mmc = &plat->mmc; + upriv->mmc->has_init = 1; + upriv->mmc->capacity = PITON_MMC_DUMMY_CAPACITY; + upriv->mmc->read_bl_len = MMC_MAX_BLOCK_LEN; + return 0; +} + +static int piton_mmc_bind(struct udevice *dev) +{ + struct piton_mmc_plat *plat = dev_get_plat(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 = PITON_MMC_DUMMY_F_MIN; + cfg->f_max = PITON_MMC_DUMMY_F_MAX; + cfg->b_max = MMC_MAX_BLOCK_LEN; + + return mmc_bind(dev, &plat->mmc, cfg); +} + +static const struct udevice_id piton_mmc_ids[] = { + {.compatible = "openpiton,piton-mmc"}, + {/* sentinel */} +}; + +U_BOOT_DRIVER(piton_mmc_drv) = { + .name = "piton_mmc", + .id = UCLASS_MMC, + .of_match = piton_mmc_ids, + .of_to_plat = piton_mmc_ofdata_to_platdata, + .bind = piton_mmc_bind, + .probe = piton_mmc_probe, + .ops = &piton_mmc_ops, + .plat_auto = sizeof(struct piton_mmc_plat), + .priv_auto = sizeof(struct piton_mmc_priv), +};