1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Synopsys DesignWare Multimedia Card Interface driver
4 *
5 * Copyright (C) 2009 NXP Semiconductors
6 * Copyright (C) 2009, 2010 Imagination Technologies Ltd.
7 */
8
9 #include <linux/err.h>
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <linux/io.h>
13 #include <linux/irq.h>
14 #include <linux/platform_device.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/slab.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/mmc.h>
19 #include <linux/of.h>
20 #include <linux/mfd/altera-sysmgr.h>
21 #include <linux/regmap.h>
22
23 #include "dw_mmc.h"
24 #include "dw_mmc-pltfm.h"
25
26 #define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45
27 #define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \
28 ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0))
29
dw_mci_pltfm_register(struct platform_device * pdev,const struct dw_mci_drv_data * drv_data)30 int dw_mci_pltfm_register(struct platform_device *pdev,
31 const struct dw_mci_drv_data *drv_data)
32 {
33 struct dw_mci *host;
34 struct resource *regs;
35
36 host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL);
37 if (!host)
38 return -ENOMEM;
39
40 host->irq = platform_get_irq(pdev, 0);
41 if (host->irq < 0)
42 return host->irq;
43
44 host->drv_data = drv_data;
45 host->dev = &pdev->dev;
46 host->irq_flags = 0;
47 host->pdata = pdev->dev.platform_data;
48
49 host->regs = devm_platform_get_and_ioremap_resource(pdev, 0, ®s);
50 if (IS_ERR(host->regs))
51 return PTR_ERR(host->regs);
52
53 /* Get registers' physical base address */
54 host->phy_regs = regs->start;
55
56 platform_set_drvdata(pdev, host);
57 return dw_mci_probe(host);
58 }
59 EXPORT_SYMBOL_GPL(dw_mci_pltfm_register);
60
61 const struct dev_pm_ops dw_mci_pltfm_pmops = {
62 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
63 pm_runtime_force_resume)
64 SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend,
65 dw_mci_runtime_resume,
66 NULL)
67 };
68 EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
69
dw_mci_socfpga_priv_init(struct dw_mci * host)70 static int dw_mci_socfpga_priv_init(struct dw_mci *host)
71 {
72 struct device_node *np = host->dev->of_node;
73 struct regmap *sys_mgr_base_addr;
74 u32 clk_phase[2] = {0}, reg_offset, reg_shift;
75 int i, rc, hs_timing;
76
77 rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0);
78 if (rc < 0)
79 return 0;
80
81 sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
82 if (IS_ERR(sys_mgr_base_addr)) {
83 dev_warn(host->dev, "clk-phase-sd-hs was specified, but failed to find altr,sys-mgr regmap!\n");
84 return 0;
85 }
86
87 of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset);
88 of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, ®_shift);
89
90 for (i = 0; i < ARRAY_SIZE(clk_phase); i++)
91 clk_phase[i] /= SOCFPGA_DW_MMC_CLK_PHASE_STEP;
92
93 hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1], reg_shift);
94 regmap_write(sys_mgr_base_addr, reg_offset, hs_timing);
95
96 return 0;
97 }
98
99 static const struct dw_mci_drv_data socfpga_drv_data = {
100 .init = dw_mci_socfpga_priv_init,
101 };
102
103 static const struct of_device_id dw_mci_pltfm_match[] = {
104 { .compatible = "snps,dw-mshc", },
105 { .compatible = "altr,socfpga-dw-mshc", .data = &socfpga_drv_data, },
106 { .compatible = "img,pistachio-dw-mshc", },
107 {},
108 };
109 MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
110
dw_mci_pltfm_probe(struct platform_device * pdev)111 static int dw_mci_pltfm_probe(struct platform_device *pdev)
112 {
113 const struct dw_mci_drv_data *drv_data = NULL;
114 const struct of_device_id *match;
115
116 if (pdev->dev.of_node) {
117 match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
118 drv_data = match->data;
119 }
120
121 return dw_mci_pltfm_register(pdev, drv_data);
122 }
123
dw_mci_pltfm_remove(struct platform_device * pdev)124 void dw_mci_pltfm_remove(struct platform_device *pdev)
125 {
126 struct dw_mci *host = platform_get_drvdata(pdev);
127
128 dw_mci_remove(host);
129 }
130 EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove);
131
132 static struct platform_driver dw_mci_pltfm_driver = {
133 .probe = dw_mci_pltfm_probe,
134 .remove_new = dw_mci_pltfm_remove,
135 .driver = {
136 .name = "dw_mmc",
137 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
138 .of_match_table = dw_mci_pltfm_match,
139 .pm = &dw_mci_pltfm_pmops,
140 },
141 };
142
143 module_platform_driver(dw_mci_pltfm_driver);
144
145 MODULE_DESCRIPTION("DW Multimedia Card Interface driver");
146 MODULE_AUTHOR("NXP Semiconductor VietNam");
147 MODULE_AUTHOR("Imagination Technologies Ltd");
148 MODULE_LICENSE("GPL v2");
149