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 
dw_mci_bluefield_set_ios(struct dw_mci * host,struct mmc_ios * ios)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 
dw_mci_bluefield_probe(struct platform_device * pdev)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		= 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