diff options
Diffstat (limited to 'drivers/mmc/host/dw_mmc-pltfm.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc-pltfm.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c new file mode 100644 index 0000000000..2353fadced --- /dev/null +++ b/drivers/mmc/host/dw_mmc-pltfm.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Synopsys DesignWare Multimedia Card Interface driver + * + * Copyright (C) 2009 NXP Semiconductors + * Copyright (C) 2009, 2010 Imagination Technologies Ltd. + */ + +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/mmc/host.h> +#include <linux/mmc/mmc.h> +#include <linux/of.h> +#include <linux/mfd/altera-sysmgr.h> +#include <linux/regmap.h> + +#include "dw_mmc.h" +#include "dw_mmc-pltfm.h" + +#define SOCFPGA_DW_MMC_CLK_PHASE_STEP 45 +#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel, reg_shift) \ + ((((smplsel) & 0x7) << reg_shift) | (((drvsel) & 0x7) << 0)) + +int dw_mci_pltfm_register(struct platform_device *pdev, + const struct dw_mci_drv_data *drv_data) +{ + struct dw_mci *host; + struct resource *regs; + + host = devm_kzalloc(&pdev->dev, sizeof(struct dw_mci), GFP_KERNEL); + if (!host) + return -ENOMEM; + + host->irq = platform_get_irq(pdev, 0); + if (host->irq < 0) + return host->irq; + + host->drv_data = drv_data; + host->dev = &pdev->dev; + host->irq_flags = 0; + host->pdata = pdev->dev.platform_data; + + host->regs = devm_platform_get_and_ioremap_resource(pdev, 0, ®s); + if (IS_ERR(host->regs)) + return PTR_ERR(host->regs); + + /* Get registers' physical base address */ + host->phy_regs = regs->start; + + platform_set_drvdata(pdev, host); + return dw_mci_probe(host); +} +EXPORT_SYMBOL_GPL(dw_mci_pltfm_register); + +const struct dev_pm_ops dw_mci_pltfm_pmops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend, + dw_mci_runtime_resume, + NULL) +}; +EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops); + +static int dw_mci_socfpga_priv_init(struct dw_mci *host) +{ + struct device_node *np = host->dev->of_node; + struct regmap *sys_mgr_base_addr; + u32 clk_phase[2] = {0}, reg_offset, reg_shift; + int i, rc, hs_timing; + + rc = of_property_read_variable_u32_array(np, "clk-phase-sd-hs", &clk_phase[0], 2, 0); + if (rc < 0) + return 0; + + sys_mgr_base_addr = altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon"); + if (IS_ERR(sys_mgr_base_addr)) { + dev_warn(host->dev, "clk-phase-sd-hs was specified, but failed to find altr,sys-mgr regmap!\n"); + return 0; + } + + of_property_read_u32_index(np, "altr,sysmgr-syscon", 1, ®_offset); + of_property_read_u32_index(np, "altr,sysmgr-syscon", 2, ®_shift); + + for (i = 0; i < ARRAY_SIZE(clk_phase); i++) + clk_phase[i] /= SOCFPGA_DW_MMC_CLK_PHASE_STEP; + + hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1], reg_shift); + regmap_write(sys_mgr_base_addr, reg_offset, hs_timing); + + return 0; +} + +static const struct dw_mci_drv_data socfpga_drv_data = { + .init = dw_mci_socfpga_priv_init, +}; + +static const struct of_device_id dw_mci_pltfm_match[] = { + { .compatible = "snps,dw-mshc", }, + { .compatible = "altr,socfpga-dw-mshc", .data = &socfpga_drv_data, }, + { .compatible = "img,pistachio-dw-mshc", }, + {}, +}; +MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match); + +static int dw_mci_pltfm_probe(struct platform_device *pdev) +{ + const struct dw_mci_drv_data *drv_data = NULL; + const struct of_device_id *match; + + if (pdev->dev.of_node) { + match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node); + drv_data = match->data; + } + + return dw_mci_pltfm_register(pdev, drv_data); +} + +void dw_mci_pltfm_remove(struct platform_device *pdev) +{ + struct dw_mci *host = platform_get_drvdata(pdev); + + dw_mci_remove(host); +} +EXPORT_SYMBOL_GPL(dw_mci_pltfm_remove); + +static struct platform_driver dw_mci_pltfm_driver = { + .probe = dw_mci_pltfm_probe, + .remove_new = dw_mci_pltfm_remove, + .driver = { + .name = "dw_mmc", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + .of_match_table = dw_mci_pltfm_match, + .pm = &dw_mci_pltfm_pmops, + }, +}; + +module_platform_driver(dw_mci_pltfm_driver); + +MODULE_DESCRIPTION("DW Multimedia Card Interface driver"); +MODULE_AUTHOR("NXP Semiconductor VietNam"); +MODULE_AUTHOR("Imagination Technologies Ltd"); +MODULE_LICENSE("GPL v2"); |