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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Synopsys DesignWare Multimedia Card Interface driver
- * extensions used in various Synopsys ARC devboards.
- *
- * Copyright (C) 2019 Synopsys
- * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
- */
- #include <common.h>
- #include <clk.h>
- #include <dm.h>
- #include <dwmmc.h>
- #include <errno.h>
- #include <fdtdec.h>
- #include <dm/device_compat.h>
- #include <linux/libfdt.h>
- #include <linux/err.h>
- #include <malloc.h>
- #define CLOCK_MIN 400000 /* 400 kHz */
- #define FIFO_MIN 8
- #define FIFO_MAX 4096
- struct snps_dwmci_plat {
- struct mmc_config cfg;
- struct mmc mmc;
- };
- struct snps_dwmci_priv_data {
- struct dwmci_host host;
- u32 f_max;
- };
- static int snps_dwmmc_clk_setup(struct udevice *dev)
- {
- struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
- struct dwmci_host *host = &priv->host;
- struct clk clk_ciu, clk_biu;
- int ret;
- ret = clk_get_by_name(dev, "ciu", &clk_ciu);
- if (ret)
- goto clk_err;
- ret = clk_enable(&clk_ciu);
- if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
- goto clk_err_ciu;
- host->bus_hz = clk_get_rate(&clk_ciu);
- if (host->bus_hz < CLOCK_MIN) {
- ret = -EINVAL;
- goto clk_err_ciu_dis;
- }
- ret = clk_get_by_name(dev, "biu", &clk_biu);
- if (ret)
- goto clk_err_ciu_dis;
- ret = clk_enable(&clk_biu);
- if (ret && ret != -ENOSYS && ret != -ENOTSUPP)
- goto clk_err_biu;
- return 0;
- clk_err_biu:
- clk_free(&clk_biu);
- clk_err_ciu_dis:
- clk_disable(&clk_ciu);
- clk_err_ciu:
- clk_free(&clk_ciu);
- clk_err:
- dev_err(dev, "failed to setup clocks, ret %d\n", ret);
- return ret;
- }
- static int snps_dwmmc_ofdata_to_platdata(struct udevice *dev)
- {
- struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
- struct dwmci_host *host = &priv->host;
- u32 fifo_depth;
- int ret;
- host->ioaddr = dev_read_addr_ptr(dev);
- /*
- * If fifo-depth is unset don't set fifoth_val - we will try to
- * auto detect it.
- */
- ret = dev_read_u32(dev, "fifo-depth", &fifo_depth);
- if (!ret) {
- if (fifo_depth < FIFO_MIN || fifo_depth > FIFO_MAX)
- return -EINVAL;
- host->fifoth_val = MSIZE(0x2) |
- RX_WMARK(fifo_depth / 2 - 1) |
- TX_WMARK(fifo_depth / 2);
- }
- host->buswidth = dev_read_u32_default(dev, "bus-width", 4);
- if (host->buswidth != 1 && host->buswidth != 4 && host->buswidth != 8)
- return -EINVAL;
- /*
- * If max-frequency is unset don't set priv->f_max - we will use
- * host->bus_hz in probe() instead.
- */
- ret = dev_read_u32(dev, "max-frequency", &priv->f_max);
- if (!ret && priv->f_max < CLOCK_MIN)
- return -EINVAL;
- host->fifo_mode = dev_read_bool(dev, "fifo-mode");
- host->name = dev->name;
- host->dev_index = 0;
- host->priv = priv;
- return 0;
- }
- int snps_dwmmc_getcd(struct udevice *dev)
- {
- struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
- struct dwmci_host *host = &priv->host;
- return !(dwmci_readl(host, DWMCI_CDETECT) & 1);
- }
- struct dm_mmc_ops snps_dwmci_dm_ops;
- static int snps_dwmmc_probe(struct udevice *dev)
- {
- #ifdef CONFIG_BLK
- struct snps_dwmci_plat *plat = dev_get_platdata(dev);
- #endif
- struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
- struct snps_dwmci_priv_data *priv = dev_get_priv(dev);
- struct dwmci_host *host = &priv->host;
- unsigned int clock_max;
- int ret;
- /* Extend generic 'dm_dwmci_ops' with our 'getcd' implementation */
- memcpy(&snps_dwmci_dm_ops, &dm_dwmci_ops, sizeof(struct dm_mmc_ops));
- snps_dwmci_dm_ops.get_cd = snps_dwmmc_getcd;
- ret = snps_dwmmc_clk_setup(dev);
- if (ret)
- return ret;
- if (!priv->f_max)
- clock_max = host->bus_hz;
- else
- clock_max = min_t(unsigned int, host->bus_hz, priv->f_max);
- #ifdef CONFIG_BLK
- dwmci_setup_cfg(&plat->cfg, host, clock_max, CLOCK_MIN);
- host->mmc = &plat->mmc;
- #else
- ret = add_dwmci(host, clock_max, CLOCK_MIN);
- if (ret)
- return ret;
- #endif
- host->mmc->priv = &priv->host;
- upriv->mmc = host->mmc;
- host->mmc->dev = dev;
- return dwmci_probe(dev);
- }
- static int snps_dwmmc_bind(struct udevice *dev)
- {
- #ifdef CONFIG_BLK
- struct snps_dwmci_plat *plat = dev_get_platdata(dev);
- int ret;
- ret = dwmci_bind(dev, &plat->mmc, &plat->cfg);
- if (ret)
- return ret;
- #endif
- return 0;
- }
- static const struct udevice_id snps_dwmmc_ids[] = {
- { .compatible = "snps,dw-mshc" },
- { }
- };
- U_BOOT_DRIVER(snps_dwmmc_drv) = {
- .name = "snps_dw_mmc",
- .id = UCLASS_MMC,
- .of_match = snps_dwmmc_ids,
- .ofdata_to_platdata = snps_dwmmc_ofdata_to_platdata,
- .ops = &snps_dwmci_dm_ops,
- .bind = snps_dwmmc_bind,
- .probe = snps_dwmmc_probe,
- .priv_auto_alloc_size = sizeof(struct snps_dwmci_priv_data),
- .platdata_auto_alloc_size = sizeof(struct snps_dwmci_plat),
- };
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