From b8736bf498afc0d250228b0c29f1b402d0d58361 Mon Sep 17 00:00:00 2001
From: Tianrui Wei tianrui-wei@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
Signed-off-by: Tianrui Wei tianrui-wei@outlook.com Acked-by: Jonathan Balkind jbalkind@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 + 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@samsung.com + * Jaehoon Chung jh80.chung@samsung.com + * Portions Copyright 2011-2019 NVIDIA Corporation + * Portions Copyright 2021 Tianrui Wei + * Tianrui Wei tianrui-wei@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 +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"}, {} +}; + +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), +};