1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sdhci-dove.c Support for SDHCI on Marvell's Dove SoC
4 *
5 * Author: Saeed Bishara <saeed@marvell.com>
6 *	   Mike Rapoport <mike@compulab.co.il>
7 * Based on sdhci-cns3xxx.c
8 */
9
10#include <linux/clk.h>
11#include <linux/err.h>
12#include <linux/io.h>
13#include <linux/mmc/host.h>
14#include <linux/module.h>
15#include <linux/of.h>
16
17#include "sdhci-pltfm.h"
18
19static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
20{
21	u16 ret;
22
23	switch (reg) {
24	case SDHCI_HOST_VERSION:
25	case SDHCI_SLOT_INT_STATUS:
26		/* those registers don't exist */
27		return 0;
28	default:
29		ret = readw(host->ioaddr + reg);
30	}
31	return ret;
32}
33
34static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
35{
36	u32 ret;
37
38	ret = readl(host->ioaddr + reg);
39
40	switch (reg) {
41	case SDHCI_CAPABILITIES:
42		/* Mask the support for 3.0V */
43		ret &= ~SDHCI_CAN_VDD_300;
44		break;
45	}
46	return ret;
47}
48
49static const struct sdhci_ops sdhci_dove_ops = {
50	.read_w	= sdhci_dove_readw,
51	.read_l	= sdhci_dove_readl,
52	.set_clock = sdhci_set_clock,
53	.set_bus_width = sdhci_set_bus_width,
54	.reset = sdhci_reset,
55	.set_uhs_signaling = sdhci_set_uhs_signaling,
56};
57
58static const struct sdhci_pltfm_data sdhci_dove_pdata = {
59	.ops	= &sdhci_dove_ops,
60	.quirks	= SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
61		  SDHCI_QUIRK_NO_BUSY_IRQ |
62		  SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
63		  SDHCI_QUIRK_FORCE_DMA |
64		  SDHCI_QUIRK_NO_HISPD_BIT,
65};
66
67static int sdhci_dove_probe(struct platform_device *pdev)
68{
69	struct sdhci_host *host;
70	struct sdhci_pltfm_host *pltfm_host;
71	int ret;
72
73	host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
74	if (IS_ERR(host))
75		return PTR_ERR(host);
76
77	pltfm_host = sdhci_priv(host);
78	pltfm_host->clk = devm_clk_get_enabled(&pdev->dev, NULL);
79
80	ret = mmc_of_parse(host->mmc);
81	if (ret)
82		goto err_sdhci_add;
83
84	ret = sdhci_add_host(host);
85	if (ret)
86		goto err_sdhci_add;
87
88	return 0;
89
90err_sdhci_add:
91	sdhci_pltfm_free(pdev);
92	return ret;
93}
94
95static const struct of_device_id sdhci_dove_of_match_table[] = {
96	{ .compatible = "marvell,dove-sdhci", },
97	{}
98};
99MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
100
101static struct platform_driver sdhci_dove_driver = {
102	.driver		= {
103		.name	= "sdhci-dove",
104		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
105		.pm	= &sdhci_pltfm_pmops,
106		.of_match_table = sdhci_dove_of_match_table,
107	},
108	.probe		= sdhci_dove_probe,
109	.remove_new	= sdhci_pltfm_remove,
110};
111
112module_platform_driver(sdhci_dove_driver);
113
114MODULE_DESCRIPTION("SDHCI driver for Dove");
115MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
116	      "Mike Rapoport <mike@compulab.co.il>");
117MODULE_LICENSE("GPL v2");
118