tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018 Mellanox Technologies.
4 */
5
6#include <linux/arm-smccc.h>
7#include <linux/bitfield.h>
8#include <linux/bitops.h>
9#include <linux/mmc/host.h>
10#include <linux/mmc/mmc.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15
16#include "dw_mmc.h"
17#include "dw_mmc-pltfm.h"
18
19#define UHS_REG_EXT_SAMPLE_MASK GENMASK(22, 16)
20#define UHS_REG_EXT_DRIVE_MASK GENMASK(29, 23)
21#define BLUEFIELD_UHS_REG_EXT_SAMPLE 2
22#define BLUEFIELD_UHS_REG_EXT_DRIVE 4
23
24/* SMC call for RST_N */
25#define BLUEFIELD_SMC_SET_EMMC_RST_N 0x82000007
26
27static void dw_mci_bluefield_set_ios(struct dw_mci *host, struct mmc_ios *ios)
28{
29 u32 reg;
30
31 /* Update the Drive and Sample fields in register UHS_REG_EXT. */
32 reg = mci_readl(host, UHS_REG_EXT);
33 reg &= ~UHS_REG_EXT_SAMPLE_MASK;
34 reg |= FIELD_PREP(UHS_REG_EXT_SAMPLE_MASK,
35 BLUEFIELD_UHS_REG_EXT_SAMPLE);
36 reg &= ~UHS_REG_EXT_DRIVE_MASK;
37 reg |= FIELD_PREP(UHS_REG_EXT_DRIVE_MASK, BLUEFIELD_UHS_REG_EXT_DRIVE);
38 mci_writel(host, UHS_REG_EXT, reg);
39}
40
41static void dw_mci_bluefield_hw_reset(struct dw_mci *host)
42{
43 struct arm_smccc_res res = { 0 };
44
45 arm_smccc_smc(BLUEFIELD_SMC_SET_EMMC_RST_N, 0, 0, 0, 0, 0, 0, 0,
46 &res);
47
48 if (res.a0)
49 pr_err("RST_N failed.\n");
50}
51
52static const struct dw_mci_drv_data bluefield_drv_data = {
53 .set_ios = dw_mci_bluefield_set_ios,
54 .hw_reset = dw_mci_bluefield_hw_reset
55};
56
57static const struct of_device_id dw_mci_bluefield_match[] = {
58 { .compatible = "mellanox,bluefield-dw-mshc",
59 .data = &bluefield_drv_data },
60 {},
61};
62MODULE_DEVICE_TABLE(of, dw_mci_bluefield_match);
63
64static int dw_mci_bluefield_probe(struct platform_device *pdev)
65{
66 return dw_mci_pltfm_register(pdev, &bluefield_drv_data);
67}
68
69static struct platform_driver dw_mci_bluefield_pltfm_driver = {
70 .probe = dw_mci_bluefield_probe,
71 .remove = dw_mci_pltfm_remove,
72 .driver = {
73 .name = "dwmmc_bluefield",
74 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
75 .of_match_table = dw_mci_bluefield_match,
76 .pm = &dw_mci_pltfm_pmops,
77 },
78};
79
80module_platform_driver(dw_mci_bluefield_pltfm_driver);
81
82MODULE_DESCRIPTION("BlueField DW Multimedia Card driver");
83MODULE_AUTHOR("Mellanox Technologies");
84MODULE_LICENSE("GPL v2");