[PATCH v3 05/14] mmc: add nexell driver
Stefan Bosch
stefan_b at posteo.net
Mon Jun 29 19:46:37 CEST 2020
Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- driver changed to DM.
- pinctrl-driver/dt is used now instead of configuring the mmc I/O-pins
in the mmc-driver.
- nexell_dwmmc_ofdata_to_platdata() reworked, i.e. valid default values
are used now (where possible) and the appropriate if-blocks have
been removed.
- new dt-property "mmcboost" is used now instead of "CONFIG_BOOST_MMC"
which was not defined anywhere.
Signed-off-by: Stefan Bosch <stefan_b at posteo.net>
---
Changes in v3:
- nexell_dw_mmc_dm.c renamed (back) to nexell_dw_mmc.c
- pinctrl-driver/dt is used now instead of configuring the mmc I/O-pins
in the mmc-driver.
- nexell_dwmmc_ofdata_to_platdata() reworked, i.e. valid default values
are used now (where possible) and the appropriate if-blocks have
been removed.
- "nexell," removed from dt-properties, e.g. "nexell,bus-width" changed
to "bus-width".
- new dt-property "mmcboost" is used now instead of "CONFIG_BOOST_MMC"
which was not defined anywhere.
- Boot error "Loading Environment from MMC... *** Warning - No block
device, using default environment" after updating local repository.
Bugfix in drivers/mmc/nexell_dw_mmc.c: "#include <clk.h>" changed to
"#include <asm/arch/clk.h>". This Bug showed up now because of the
commit "dm: clk: add stub when CONFIG_CLK is deactivated" where
include/clk.h has been changed.
- drivers/mmc/nexell_dw_mmc.c: '#include <log.h>' inserted because it
has been removed from common.h.
Changes in v2:
- commit "i2c: mmc: add nexell driver (gpio, i2c, mmc, pwm)" splitted
into separate commits for gpio, i2c, mmc, pwm.
drivers/mmc/Kconfig | 8 ++
drivers/mmc/Makefile | 1 +
drivers/mmc/nexell_dw_mmc.c | 237 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 246 insertions(+)
create mode 100644 drivers/mmc/nexell_dw_mmc.c
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 3c4f057..5fc47c8 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -264,6 +264,14 @@ config MMC_DW_SNPS
This selects support for Synopsys DesignWare Memory Card Interface driver
extensions used in various Synopsys ARC devboards.
+config NEXELL_DWMMC
+ bool "Nexell SD/MMC controller support"
+ depends on ARCH_NEXELL
+ depends on MMC_DW
+ depends on DM_MMC
+ depends on PINCTRL_NEXELL
+ default y
+
config MMC_MESON_GX
bool "Meson GX EMMC controller support"
depends on DM_MMC && BLK && ARCH_MESON
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index e84c792..d375669 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_SH_MMCIF) += sh_mmcif.o
obj-$(CONFIG_SH_SDHI) += sh_sdhi.o
obj-$(CONFIG_STM32_SDMMC2) += stm32_sdmmc2.o
obj-$(CONFIG_JZ47XX_MMC) += jz_mmc.o
+obj-$(CONFIG_NEXELL_DWMMC) += nexell_dw_mmc.o
# SDHCI
obj-$(CONFIG_MMC_SDHCI) += sdhci.o
diff --git a/drivers/mmc/nexell_dw_mmc.c b/drivers/mmc/nexell_dw_mmc.c
new file mode 100644
index 0000000..0462759
--- /dev/null
+++ b/drivers/mmc/nexell_dw_mmc.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Nexell
+ * Youngbok, Park <park at nexell.co.kr>
+ *
+ * (C) Copyright 2019 Stefan Bosch <stefan_b at posteo.net>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dt-structs.h>
+#include <dwmmc.h>
+#include <log.h>
+#include <syscon.h>
+#include <asm/arch/reset.h>
+#include <asm/arch/clk.h>
+
+#define DWMCI_CLKSEL 0x09C
+#define DWMCI_SHIFT_0 0x0
+#define DWMCI_SHIFT_1 0x1
+#define DWMCI_SHIFT_2 0x2
+#define DWMCI_SHIFT_3 0x3
+#define DWMCI_SET_SAMPLE_CLK(x) (x)
+#define DWMCI_SET_DRV_CLK(x) ((x) << 16)
+#define DWMCI_SET_DIV_RATIO(x) ((x) << 24)
+#define DWMCI_CLKCTRL 0x114
+#define NX_MMC_CLK_DELAY(x, y, a, b) ((((x) & 0xFF) << 0) |\
+ (((y) & 0x03) << 16) |\
+ (((a) & 0xFF) << 8) |\
+ (((b) & 0x03) << 24))
+
+struct nexell_mmc_plat {
+ struct mmc_config cfg;
+ struct mmc mmc;
+};
+
+struct nexell_dwmmc_priv {
+ struct clk *clk;
+ struct dwmci_host host;
+ int fifo_size;
+ bool fifo_mode;
+ int frequency;
+ u32 min_freq;
+ u32 max_freq;
+ int d_delay;
+ int d_shift;
+ int s_delay;
+ int s_shift;
+ bool mmcboost;
+};
+
+struct clk *clk_get(const char *id);
+
+static void nx_dw_mmc_clksel(struct dwmci_host *host)
+{
+ /* host->priv is pointer to "struct udevice" */
+ struct nexell_dwmmc_priv *priv = dev_get_priv(host->priv);
+ u32 val;
+
+ if (priv->mmcboost)
+ val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
+ DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(1);
+ else
+ val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
+ DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(3);
+
+ dwmci_writel(host, DWMCI_CLKSEL, val);
+}
+
+static void nx_dw_mmc_reset(int ch)
+{
+ int rst_id = RESET_ID_SDMMC0 + ch;
+
+ nx_rstcon_setrst(rst_id, 0);
+ nx_rstcon_setrst(rst_id, 1);
+}
+
+static void nx_dw_mmc_clk_delay(struct udevice *dev)
+{
+ unsigned int delay;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+
+ delay = NX_MMC_CLK_DELAY(priv->d_delay,
+ priv->d_shift, priv->s_delay, priv->s_shift);
+
+ writel(delay, (host->ioaddr + DWMCI_CLKCTRL));
+ debug("%s: Values set: d_delay==%d, d_shift==%d, s_delay==%d, "
+ "s_shift==%d\n", __func__, priv->d_delay, priv->d_shift,
+ priv->s_delay, priv->s_shift);
+}
+
+static unsigned int nx_dw_mmc_get_clk(struct dwmci_host *host, uint freq)
+{
+ struct clk *clk;
+ struct udevice *dev = host->priv;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+
+ int index = host->dev_index;
+ char name[50] = { 0, };
+
+ clk = priv->clk;
+ if (!clk) {
+ sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
+ clk = clk_get((const char *)name);
+ if (!clk)
+ return 0;
+ priv->clk = clk;
+ }
+
+ return clk_get_rate(clk) / 2;
+}
+
+static unsigned long nx_dw_mmc_set_clk(struct dwmci_host *host,
+ unsigned int rate)
+{
+ struct clk *clk;
+ char name[50] = { 0, };
+ struct udevice *dev = host->priv;
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+
+ int index = host->dev_index;
+
+ clk = priv->clk;
+ if (!clk) {
+ sprintf(name, "%s.%d", DEV_NAME_SDHC, index);
+ clk = clk_get((const char *)name);
+ if (!clk) {
+ debug("%s: clk_get(\"%s\") failed!\n", __func__, name);
+ return 0;
+ }
+ priv->clk = clk;
+ }
+
+ clk_disable(clk);
+ rate = clk_set_rate(clk, rate);
+ clk_enable(clk);
+
+ return rate;
+}
+
+static int nexell_dwmmc_ofdata_to_platdata(struct udevice *dev)
+{
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+ int val = -1;
+
+ debug("%s\n", __func__);
+
+ host->name = dev->name;
+ host->ioaddr = dev_read_addr_ptr(dev);
+ host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
+ host->get_mmc_clk = nx_dw_mmc_get_clk;
+ host->clksel = nx_dw_mmc_clksel;
+ host->priv = dev;
+
+ val = dev_read_u32_default(dev, "index", -1);
+ if (val < 0 || val > 2) {
+ debug(" 'index' missing/invalid!\n");
+ return -EINVAL;
+ }
+ host->dev_index = val;
+
+ priv->fifo_size = dev_read_u32_default(dev, "fifo-size", 0x20);
+ priv->fifo_mode = dev_read_bool(dev, "fifo-mode");
+ priv->frequency = dev_read_u32_default(dev, "frequency", 50000000);
+ priv->max_freq = dev_read_u32_default(dev, "max-frequency", 50000000);
+ priv->min_freq = 400000; /* 400 kHz */
+ priv->d_delay = dev_read_u32_default(dev, "drive_dly", 0);
+ priv->d_shift = dev_read_u32_default(dev, "drive_shift", 3);
+ priv->s_delay = dev_read_u32_default(dev, "sample_dly", 0);
+ priv->s_shift = dev_read_u32_default(dev, "sample_shift", 2);
+ priv->mmcboost = dev_read_u32_default(dev, "mmcboost", 0);
+
+ debug(" index==%d, name==%s, ioaddr==0x%08x\n",
+ host->dev_index, host->name, (u32)host->ioaddr);
+ return 0;
+}
+
+static int nexell_dwmmc_probe(struct udevice *dev)
+{
+ struct nexell_mmc_plat *plat = dev_get_platdata(dev);
+ struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
+ struct nexell_dwmmc_priv *priv = dev_get_priv(dev);
+ struct dwmci_host *host = &priv->host;
+ struct udevice *pwr_dev __maybe_unused;
+
+ host->fifoth_val = MSIZE(0x2) |
+ RX_WMARK(priv->fifo_size / 2 - 1) |
+ TX_WMARK(priv->fifo_size / 2);
+
+ host->fifo_mode = priv->fifo_mode;
+
+ dwmci_setup_cfg(&plat->cfg, host, priv->max_freq, priv->min_freq);
+ host->mmc = &plat->mmc;
+ host->mmc->priv = &priv->host;
+ host->mmc->dev = dev;
+ upriv->mmc = host->mmc;
+
+ if (nx_dw_mmc_set_clk(host, priv->frequency * 4) !=
+ priv->frequency * 4) {
+ debug("%s: nx_dw_mmc_set_clk(host, %d) failed!\n",
+ __func__, priv->frequency * 4);
+ return -EIO;
+ }
+ debug("%s: nx_dw_mmc_set_clk(host, %d) OK\n",
+ __func__, priv->frequency * 4);
+
+ nx_dw_mmc_reset(host->dev_index);
+ nx_dw_mmc_clk_delay(dev);
+
+ return dwmci_probe(dev);
+}
+
+static int nexell_dwmmc_bind(struct udevice *dev)
+{
+ struct nexell_mmc_plat *plat = dev_get_platdata(dev);
+
+ return dwmci_bind(dev, &plat->mmc, &plat->cfg);
+}
+
+static const struct udevice_id nexell_dwmmc_ids[] = {
+ { .compatible = "nexell,nexell-dwmmc" },
+ { }
+};
+
+U_BOOT_DRIVER(nexell_dwmmc_drv) = {
+ .name = "nexell_dwmmc",
+ .id = UCLASS_MMC,
+ .of_match = nexell_dwmmc_ids,
+ .ofdata_to_platdata = nexell_dwmmc_ofdata_to_platdata,
+ .ops = &dm_dwmci_ops,
+ .bind = nexell_dwmmc_bind,
+ .probe = nexell_dwmmc_probe,
+ .priv_auto_alloc_size = sizeof(struct nexell_dwmmc_priv),
+ .platdata_auto_alloc_size = sizeof(struct nexell_mmc_plat),
+};
--
1.9.1
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