1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Mellanox Technologies. 4 */ 5 6 #include <linux/bitfield.h> 7 #include <linux/bitops.h> 8 #include <linux/mmc/host.h> 9 #include <linux/mmc/mmc.h> 10 #include <linux/module.h> 11 #include <linux/of.h> 12 #include <linux/platform_device.h> 13 #include <linux/pm_runtime.h> 14 15 #include "dw_mmc.h" 16 #include "dw_mmc-pltfm.h" 17 18 #define UHS_REG_EXT_SAMPLE_MASK GENMASK(22, 16) 19 #define UHS_REG_EXT_DRIVE_MASK GENMASK(29, 23) 20 #define BLUEFIELD_UHS_REG_EXT_SAMPLE 2 21 #define BLUEFIELD_UHS_REG_EXT_DRIVE 4 22 23 static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios) 24 { 25 u32 reg; 26 27 /* Update the Drive and Sample fields in register UHS_REG_EXT. */ 28 reg = mci_readl(host, UHS_REG_EXT); 29 reg &= ~UHS_REG_EXT_SAMPLE_MASK; 30 reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK, 31 BLUEFIELD_UHS_REG_EXT_SAMPLE); 32 reg &= ~UHS_REG_EXT_DRIVE_MASK; 33 reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE); 34 mci_writel(host, UHS_REG_EXT, reg); 35 } 36 37 static const struct dw_mci_drv_data bluefield_drv_data = { 38 .set_ios = dw_mci_bluefield_set_ios 39 }; 40 41 static const struct of_device_id dw_mci_bluefield_match[] = { 42 { .compatible = "mellanox,bluefield-dw-mshc", 43 .data = &bluefield_drv_data }, 44 {}, 45 }; 46 MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match); 47 48 static int dw_mci_bluefield_probe(struct platform_device *pdev) 49 { 50 return dw_mci_pltfm_register(pdev, &bluefield_drv_data); 51 } 52 53 static struct platform_driver dw_mci_bluefield_pltfm_driver = { 54 .probe = dw_mci_bluefield_probe, 55 .remove_new = dw_mci_pltfm_remove, 56 .driver = { 57 .name = "dwmmc_bluefield", 58 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 59 .of_match_table = dw_mci_bluefield_match, 60 .pm = &dw_mci_pltfm_pmops, 61 }, 62 }; 63 64 module_platform_driver(dw_mci_bluefield_pltfm_driver); 65 66 MODULE_DESCRIPTION("BlueField DW Multimedia Card driver"); 67 MODULE_AUTHOR("Mellanox Technologies"); 68 MODULE_LICENSE("GPL v2"); 69