drivers/mmc/host/dw_mmc-pltfm.c

   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
  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, &regs);
  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
  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, &reg_offset);
  88         of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, &reg_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
 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
 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");