[RESEND PATCH v6 2/2] mmc: openpiton: add piton_mmc driver
Tianrui Wei
tianrui-wei at outlook.com
Sat Jun 12 19:16:50 CEST 2021
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 at outlook.com>
Signed-off-by: Jonathan Balkind <jbalkind at 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 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..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
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 at samsung.com>
+ * Jaehoon Chung <jh80.chung at 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 at 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)
+{
+ /* 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;
+ }
+
+ 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;
+ 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;
+
+ 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;
+ upriv->mmc->capacity = 0x2000000000ULL;
+ 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_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"},
+ {/* 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),
+};
--
2.32.0
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