1 // SPDX-License-Identifier: GPL-2.0+
3 * Synopsys DesignWare Multimedia Card Interface driver
4 * extensions used in various Synopsys ARC devboards.
6 * Copyright (C) 2019 Synopsys
15 #include <dm/device_compat.h>
16 #include <linux/libfdt.h>
17 #include <linux/err.h>
20 #define CLOCK_MIN 400000 /* 400 kHz */
24 struct snps_dwmci_plat {
25 struct mmc_config cfg;
29 struct snps_dwmci_priv_data {
30 struct dwmci_host host;
34 static int snps_dwmmc_clk_setup(struct udevice *dev)
36 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
37 struct dwmci_host *host = &priv->host;
39 struct clk clk_ciu, clk_biu;
42 ret = clk_get_by_name(dev, "ciu", &clk_ciu);
46 ret = clk_enable(&clk_ciu);
47 if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
50 host->bus_hz = clk_get_rate(&clk_ciu);
51 if (host->bus_hz < CLOCK_MIN) {
56 ret = clk_get_by_name(dev, "biu", &clk_biu);
60 ret = clk_enable(&clk_biu);
61 if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
67 clk_disable(&clk_ciu);
69 dev_err(dev, "failed to setup clocks, ret %d\n", ret);
74 static int snps_dwmmc_of_to_plat(struct udevice *dev)
76 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
77 struct dwmci_host *host = &priv->host;
81 host->ioaddr = dev_read_addr_ptr(dev);
84 * If fifo-depth is unset don't set fifoth_val - we will try to
87 ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
89 if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
92 host->fifoth_val = MSIZE(0x2) |
93 RX_WMARK(fifo_depth / 2 - 1) |
94 TX_WMARK(fifo_depth / 2);
97 host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
98 if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
102 * If max-frequency is unset don't set priv->f_max - we will use
103 * host->bus_hz in probe() instead.
105 ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
106 if (!ret && priv->f_max < CLOCK_MIN)
109 host->fifo_mode = dev_read_bool(dev, "fifo-mode");
110 host->name = dev->name;
117 int snps_dwmmc_getcd(struct udevice *dev)
119 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
120 struct dwmci_host *host = &priv->host;
122 return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
125 struct dm_mmc_ops snps_dwmci_dm_ops;
127 static int snps_dwmmc_probe(struct udevice *dev)
130 struct snps_dwmci_plat *plat = dev_get_plat(dev);
132 struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
133 struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
134 struct dwmci_host *host = &priv->host;
135 unsigned int clock_max;
138 /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
139 memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
140 snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
142 ret = snps_dwmmc_clk_setup(dev);
147 clock_max = host->bus_hz;
149 clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
152 dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
153 host->mmc = &plat->mmc;
155 ret = add_dwmci(host, clock_max, CLOCK_MIN);
159 host->mmc->priv = &priv->host;
160 upriv->mmc = host->mmc;
161 host->mmc->dev = dev;
163 return dwmci_probe(dev);
166 static int snps_dwmmc_bind(struct udevice *dev)
169 struct snps_dwmci_plat *plat = dev_get_plat(dev);
172 ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
180 static const struct udevice_id snps_dwmmc_ids[] = {
181 { .compatible = "snps,dw-mshc" },
185 U_BOOT_DRIVER(snps_dwmmc_drv) = {
186 .name = "snps_dw_mmc",
188 .of_match = snps_dwmmc_ids,
189 .of_to_plat = snps_dwmmc_of_to_plat,
190 .ops = &snps_dwmci_dm_ops,
191 .bind = snps_dwmmc_bind,
192 .probe = snps_dwmmc_probe,
193 .priv_auto = sizeof(struct snps_dwmci_priv_data),
194 .plat_auto = sizeof(struct snps_dwmci_plat),