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
sdhci_dove_readw(struct sdhci_host * host,int reg)19 static 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
sdhci_dove_readl(struct sdhci_host * host,int reg)34 static 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
49 static 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
58 static 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
sdhci_dove_probe(struct platform_device * pdev)67 static 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
90 err_sdhci_add:
91 sdhci_pltfm_free(pdev);
92 return ret;
93 }
94
95 static const struct of_device_id sdhci_dove_of_match_table[] = {
96 { .compatible = "marvell,dove-sdhci", },
97 {}
98 };
99 MODULE_DEVICE_TABLE(of, sdhci_dove_of_match_table);
100
101 static 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
112 module_platform_driver(sdhci_dove_driver);
113
114 MODULE_DESCRIPTION("SDHCI driver for Dove");
115 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>, "
116 "Mike Rapoport <mike@compulab.co.il>");
117 MODULE_LICENSE("GPL v2");
118