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-only
2/*
3 * sdhci-brcmstb.c Support for SDHCI on Broadcom BRCMSTB SoC's
4 *
5 * Copyright (C) 2015 Broadcom Corporation
6 */
7
8#include <linux/io.h>
9#include <linux/mmc/host.h>
10#include <linux/module.h>
11#include <linux/of.h>
12
13#include "sdhci-pltfm.h"
14
15static const struct sdhci_ops sdhci_brcmstb_ops = {
16 .set_clock = sdhci_set_clock,
17 .set_bus_width = sdhci_set_bus_width,
18 .reset = sdhci_reset,
19 .set_uhs_signaling = sdhci_set_uhs_signaling,
20};
21
22static const struct sdhci_pltfm_data sdhci_brcmstb_pdata = {
23 .ops = &sdhci_brcmstb_ops,
24};
25
26static int sdhci_brcmstb_probe(struct platform_device *pdev)
27{
28 struct sdhci_host *host;
29 struct sdhci_pltfm_host *pltfm_host;
30 struct clk *clk;
31 int res;
32
33 clk = devm_clk_get(&pdev->dev, NULL);
34 if (IS_ERR(clk)) {
35 dev_err(&pdev->dev, "Clock not found in Device Tree\n");
36 clk = NULL;
37 }
38 res = clk_prepare_enable(clk);
39 if (res)
40 return res;
41
42 host = sdhci_pltfm_init(pdev, &sdhci_brcmstb_pdata, 0);
43 if (IS_ERR(host)) {
44 res = PTR_ERR(host);
45 goto err_clk;
46 }
47
48 sdhci_get_of_property(pdev);
49 res = mmc_of_parse(host->mmc);
50 if (res)
51 goto err;
52
53 /*
54 * Supply the existing CAPS, but clear the UHS modes. This
55 * will allow these modes to be specified by device tree
56 * properties through mmc_of_parse().
57 */
58 host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
59 if (of_device_is_compatible(pdev->dev.of_node, "brcm,bcm7425-sdhci"))
60 host->caps &= ~SDHCI_CAN_64BIT;
61 host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
62 host->caps1 &= ~(SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_SDR104 |
63 SDHCI_SUPPORT_DDR50);
64 host->quirks |= SDHCI_QUIRK_MISSING_CAPS |
65 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
66
67 res = sdhci_add_host(host);
68 if (res)
69 goto err;
70
71 pltfm_host = sdhci_priv(host);
72 pltfm_host->clk = clk;
73 return res;
74
75err:
76 sdhci_pltfm_free(pdev);
77err_clk:
78 clk_disable_unprepare(clk);
79 return res;
80}
81
82static const struct of_device_id sdhci_brcm_of_match[] = {
83 { .compatible = "brcm,bcm7425-sdhci" },
84 { .compatible = "brcm,bcm7445-sdhci" },
85 {},
86};
87MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
88
89static struct platform_driver sdhci_brcmstb_driver = {
90 .driver = {
91 .name = "sdhci-brcmstb",
92 .pm = &sdhci_pltfm_pmops,
93 .of_match_table = of_match_ptr(sdhci_brcm_of_match),
94 },
95 .probe = sdhci_brcmstb_probe,
96 .remove = sdhci_pltfm_unregister,
97};
98
99module_platform_driver(sdhci_brcmstb_driver);
100
101MODULE_DESCRIPTION("SDHCI driver for Broadcom BRCMSTB SoCs");
102MODULE_AUTHOR("Broadcom");
103MODULE_LICENSE("GPL v2");