Dear Tianrui,
On 6/13/21 2:16 AM, Tianrui Wei wrote:
This commit adds support to piton_mmc driver for OpenPiton-riscv64 In particular, this driver
- V6 . change type of address . move declarations ahead . loop style update
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 | 169 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 179 insertions(+) create mode 100644 drivers/mmc/piton_mmc.c
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig index 8901456967..096d6a930c 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 onOpenPiton SoC. Note that this SD controller directlyexposes the contents of the SD card as memory mapped,so there is no manual configuration required
Fix indentation.
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..cc08b41d0d 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
Ditto.
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..32671d1a89 --- /dev/null +++ b/drivers/mmc/piton_mmc.c @@ -0,0 +1,169 @@ +// 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 <log.h> +#include <mmc.h>
+struct piton_mmc_plat {
- struct mmc_config cfg;
- struct mmc mmc;
+};
+struct piton_mmc_priv {
- void __iomem *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)
Ditto.
+{
- /* check first if this is a pure command */
- if (!data)
return 0;- struct piton_mmc_priv *priv = dev_get_priv(dev);
- u32 *buff, *start_addr;
- size_t byte_cnt, start_block;
- buff = (u32 *)data->dest;
- start_block = cmd->cmdarg;
- start_addr = priv->piton_mmc_base_addr + start_block;
- /* if there is a read */
- if (data->flags & MMC_DATA_READ) {
for (byte_cnt = data->blocks * data->blocksize; byte_cnt;byte_cnt -= sizeof(u32)) {*buff++ = readl(start_addr++);}- } else {
return -ENOSYS;
Is is right to return -ENOSYS? MMC_DATA_WRITE doesn't support?
- }
- 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;
- /* fill in device description */
- struct blk_desc *bdesc;
- priv->piton_mmc_base_addr = (void *)dev_read_addr(dev);
- cfg = &plat->cfg;
- cfg->name = "PITON MMC";
- cfg->host_caps = MMC_MODE_8BIT;
- cfg->f_max = 100000;
f_max is 100K? I don't think so.
- 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;
Use macro. It's not readable. What's 0x2000000000ULL?
- mmc->has_init = 1;
Right? has_init will be set in mmc.c. Why it's set to 1 in driver?
- 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;
+}
+/* test if the micro sd card is present
- always return 1, which means present
- */
+static int piton_mmc_getcd(struct udevice *dev) +{
- /*
* always return 1*/- return 1;
+}
+/* dummy function, piton_mmc don't need initialization
- in hw
- */
+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_platdata(dev);
- struct mmc_config *cfg = &plat->cfg;
- cfg->name = dev->name;
- upriv->mmc = &plat->mmc;
- upriv->mmc->has_init = 1;
Ditto.
- upriv->mmc->capacity = 0x2000000000ULL;
Ditto.
- upriv->mmc->read_bl_len = MMC_MAX_BLOCK_LEN;
readl_blk_len will be set in mmc.c. Your driver doesn't use mmc.c? Why do you set to some values in your driver?
- return 0;
+}
+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;
Use a readable value instead of U32_MAX. CONFIG_SYS_MMC_MAX_BLK_COUNT or other.
Best Regards, Jaehoon Chung
- 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,
- .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),
+};