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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2016 Nexell
- * Youngbok, Park <park@nexell.co.kr>
- *
- * (C) Copyright 2019 Stefan Bosch <stefan_b@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),
- };
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