--- /dev/null
+/*
+ * Altera SoCFPGA Specific Extensions for Synopsys DW Multimedia Card Interface
+ * driver
+ *
+ * Copyright (C) 2012, Samsung Electronics Co., Ltd.
+ * Copyright (C) 2013 Altera Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Taken from dw_mmc-exynos.c
+ */
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/dw_mmc.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
+#define DRV_CLK_PHASE_SHIFT_SEL_MASK 0x7
+#define SYSMGR_SDMMC_CTRL_SET(smplsel, drvsel) \
+ ((((smplsel) & 0x7) << 3) | (((drvsel) & 0x7) << 0))
+
+/* SOCFPGA implementation specific driver private data */
+struct dw_mci_socfpga_priv_data {
+ u8 ciu_div; /* card interface unit divisor */
+ u32 hs_timing; /* bitmask for CIU clock phase shift */
+ struct regmap *sysreg; /* regmap for system manager register */
+};
+
+static int dw_mci_socfpga_priv_init(struct dw_mci *host)
+{
+ struct dw_mci_socfpga_priv_data *priv;
+
+ priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv) {
+ dev_err(host->dev, "mem alloc failed for private data\n");
+ return -ENOMEM;
+ }
+
+ priv->sysreg = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
+ if (IS_ERR(priv->sysreg)) {
+ dev_err(host->dev, "regmap for altr,sys-mgr lookup failed.\n");
+ return PTR_ERR(priv->sysreg);
+ }
+ host->priv = priv;
+
+ return 0;
+}
+
+static int dw_mci_socfpga_setup_clock(struct dw_mci *host)
+{
+ struct dw_mci_socfpga_priv_data *priv = host->priv;
+
+ clk_disable_unprepare(host->ciu_clk);
+ regmap_write(priv->sysreg, SYSMGR_SDMMCGRP_CTRL_OFFSET,
+ priv->hs_timing);
+ clk_prepare_enable(host->ciu_clk);
+
+ host->bus_hz /= (priv->ciu_div + 1);
+ return 0;
+}
+
+static void dw_mci_socfpga_prepare_command(struct dw_mci *host, u32 *cmdr)
+{
+ struct dw_mci_socfpga_priv_data *priv = host->priv;
+
+ if (priv->hs_timing & DRV_CLK_PHASE_SHIFT_SEL_MASK)
+ *cmdr |= SDMMC_CMD_USE_HOLD_REG;
+}
+
+static int dw_mci_socfpga_parse_dt(struct dw_mci *host)
+{
+ struct dw_mci_socfpga_priv_data *priv = host->priv;
+ struct device_node *np = host->dev->of_node;
+ u32 timing[2];
+ u32 div = 0;
+ int ret;
+
+ ret = of_property_read_u32(np, "altr,dw-mshc-ciu-div", &div);
+ if (ret)
+ dev_info(host->dev, "No dw-mshc-ciu-div specified, assuming 1");
+ priv->ciu_div = div;
+
+ ret = of_property_read_u32_array(np,
+ "altr,dw-mshc-sdr-timing", timing, 2);
+ if (ret)
+ return ret;
+
+ priv->hs_timing = SYSMGR_SDMMC_CTRL_SET(timing[0], timing[1]);
+ return 0;
+}
+
+static const struct dw_mci_drv_data socfpga_drv_data = {
+ .init = dw_mci_socfpga_priv_init,
+ .setup_clock = dw_mci_socfpga_setup_clock,
+ .prepare_command = dw_mci_socfpga_prepare_command,
+ .parse_dt = dw_mci_socfpga_parse_dt,
+};
+
+static const struct of_device_id dw_mci_socfpga_match[] = {
+ { .compatible = "altr,socfpga-dw-mshc",
+ .data = &socfpga_drv_data, },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dw_mci_socfpga_match);
+
+int dw_mci_socfpga_probe(struct platform_device *pdev)
+{
+ const struct dw_mci_drv_data *drv_data;
+ const struct of_device_id *match;
+
+ match = of_match_node(dw_mci_socfpga_match, pdev->dev.of_node);
+ drv_data = match->data;
+ return dw_mci_pltfm_register(pdev, drv_data);
+}
+
+static struct platform_driver dw_mci_socfpga_pltfm_driver = {
+ .probe = dw_mci_socfpga_probe,
+ .remove = __exit_p(dw_mci_pltfm_remove),
+ .driver = {
+ .name = "dwmmc_socfpga",
+ .of_match_table = of_match_ptr(dw_mci_socfpga_match),
+ .pm = &dw_mci_pltfm_pmops,
+ },
+};
+
+module_platform_driver(dw_mci_socfpga_pltfm_driver);
+
+MODULE_DESCRIPTION("Altera SOCFPGA Specific DW-MSHC Driver Extension");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:dwmmc-socfpga");
projects / mirror_ubuntu-zesty-kernel.git / commitdiff