/* * Universal Flash Storage Host controller Platform bus based glue driver * * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c * Copyright (C) 2011-2013 Samsung India Software Operations * * Authors: * Santosh Yaraganavi <santosh.sy@samsung.com> * Vinayak Holikatti <h.vinayak@samsung.com> * * 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. * See the COPYING file in the top-level directory or visit * <http://www.gnu.org/licenses/gpl-2.0.html> * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * This program is provided "AS IS" and "WITH ALL FAULTS" and * without warranty of any kind. You are solely responsible for * determining the appropriateness of using and distributing * the program and assume all risks associated with your exercise * of rights with respect to the program, including but not limited * to infringement of third party rights, the risks and costs of * program errors, damage to or loss of data, programs or equipment, * and unavailability or interruption of operations. Under no * circumstances will the contributor of this Program be liable for * any damages of any kind arising from your use or distribution of * this program. */ #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/of.h> #include "ufshcd.h" #include "ufshcd-pltfrm.h" static int ufshcd_parse_clock_info(struct ufs_hba *hba) { int ret = 0; int cnt; int i; struct device *dev = hba->dev; struct device_node *np = dev->of_node; char *name; u32 *clkfreq = NULL; struct ufs_clk_info *clki; int len = 0; size_t sz = 0; if (!np) goto out; INIT_LIST_HEAD(&hba->clk_list_head); cnt = of_property_count_strings(np, "clock-names"); if (!cnt || (cnt == -EINVAL)) { dev_info(dev, "%s: Unable to find clocks, assuming enabled\n", __func__); } else if (cnt < 0) { dev_err(dev, "%s: count clock strings failed, err %d\n", __func__, cnt); ret = cnt; } if (cnt <= 0) goto out; if (!of_get_property(np, "freq-table-hz", &len)) { dev_info(dev, "freq-table-hz property not specified\n"); goto out; } if (len <= 0) goto out; sz = len / sizeof(*clkfreq); if (sz != 2 * cnt) { dev_err(dev, "%s len mismatch\n", "freq-table-hz"); ret = -EINVAL; goto out; } clkfreq = devm_kzalloc(dev, sz * sizeof(*clkfreq), GFP_KERNEL); if (!clkfreq) { ret = -ENOMEM; goto out; } ret = of_property_read_u32_array(np, "freq-table-hz", clkfreq, sz); if (ret && (ret != -EINVAL)) { dev_err(dev, "%s: error reading array %d\n", "freq-table-hz", ret); return ret; } for (i = 0; i < sz; i += 2) { ret = of_property_read_string_index(np, "clock-names", i/2, (const char **)&name); if (ret) goto out; clki = devm_kzalloc(dev, sizeof(*clki), GFP_KERNEL); if (!clki) { ret = -ENOMEM; goto out; } clki->min_freq = clkfreq[i]; clki->max_freq = clkfreq[i+1]; clki->name = kstrdup(name, GFP_KERNEL); dev_dbg(dev, "%s: min %u max %u name %s\n", "freq-table-hz", clki->min_freq, clki->max_freq, clki->name); list_add_tail(&clki->list, &hba->clk_list_head); } out: return ret; } #define MAX_PROP_SIZE 32 static int ufshcd_populate_vreg(struct device *dev, const char *name, struct ufs_vreg **out_vreg) { int ret = 0; char prop_name[MAX_PROP_SIZE]; struct ufs_vreg *vreg = NULL; struct device_node *np = dev->of_node; if (!np) { dev_err(dev, "%s: non DT initialization\n", __func__); goto out; } snprintf(prop_name, MAX_PROP_SIZE, "%s-supply", name); if (!of_parse_phandle(np, prop_name, 0)) { dev_info(dev, "%s: Unable to find %s regulator, assuming enabled\n", __func__, prop_name); goto out; } vreg = devm_kzalloc(dev, sizeof(*vreg), GFP_KERNEL); if (!vreg) return -ENOMEM; vreg->name = kstrdup(name, GFP_KERNEL); /* if fixed regulator no need further initialization */ snprintf(prop_name, MAX_PROP_SIZE, "%s-fixed-regulator", name); if (of_property_read_bool(np, prop_name)) goto out; snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name); ret = of_property_read_u32(np, prop_name, &vreg->max_uA); if (ret) { dev_err(dev, "%s: unable to find %s err %d\n", __func__, prop_name, ret); goto out_free; } vreg->min_uA = 0; if (!strcmp(name, "vcc")) { if (of_property_read_bool(np, "vcc-supply-1p8")) { vreg->min_uV = UFS_VREG_VCC_1P8_MIN_UV; vreg->max_uV = UFS_VREG_VCC_1P8_MAX_UV; } else { vreg->min_uV = UFS_VREG_VCC_MIN_UV; vreg->max_uV = UFS_VREG_VCC_MAX_UV; } } else if (!strcmp(name, "vccq")) { vreg->min_uV = UFS_VREG_VCCQ_MIN_UV; vreg->max_uV = UFS_VREG_VCCQ_MAX_UV; } else if (!strcmp(name, "vccq2")) { vreg->min_uV = UFS_VREG_VCCQ2_MIN_UV; vreg->max_uV = UFS_VREG_VCCQ2_MAX_UV; } goto out; out_free: devm_kfree(dev, vreg); vreg = NULL; out: if (!ret) *out_vreg = vreg; return ret; } /** * ufshcd_parse_regulator_info - get regulator info from device tree * @hba: per adapter instance * * Get regulator info from device tree for vcc, vccq, vccq2 power supplies. * If any of the supplies are not defined it is assumed that they are always-on * and hence return zero. If the property is defined but parsing is failed * then return corresponding error. */ static int ufshcd_parse_regulator_info(struct ufs_hba *hba) { int err; struct device *dev = hba->dev; struct ufs_vreg_info *info = &hba->vreg_info; err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba); if (err) goto out; err = ufshcd_populate_vreg(dev, "vcc", &info->vcc); if (err) goto out; err = ufshcd_populate_vreg(dev, "vccq", &info->vccq); if (err) goto out; err = ufshcd_populate_vreg(dev, "vccq2", &info->vccq2); out: return err; } #ifdef CONFIG_PM /** * ufshcd_pltfrm_suspend - suspend power management function * @dev: pointer to device handle * * Returns 0 if successful * Returns non-zero otherwise */ int ufshcd_pltfrm_suspend(struct device *dev) { return ufshcd_system_suspend(dev_get_drvdata(dev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_suspend); /** * ufshcd_pltfrm_resume - resume power management function * @dev: pointer to device handle * * Returns 0 if successful * Returns non-zero otherwise */ int ufshcd_pltfrm_resume(struct device *dev) { return ufshcd_system_resume(dev_get_drvdata(dev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_resume); int ufshcd_pltfrm_runtime_suspend(struct device *dev) { return ufshcd_runtime_suspend(dev_get_drvdata(dev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_suspend); int ufshcd_pltfrm_runtime_resume(struct device *dev) { return ufshcd_runtime_resume(dev_get_drvdata(dev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_resume); int ufshcd_pltfrm_runtime_idle(struct device *dev) { return ufshcd_runtime_idle(dev_get_drvdata(dev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_idle); #endif /* CONFIG_PM */ void ufshcd_pltfrm_shutdown(struct platform_device *pdev) { ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev)); } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown); /** * ufshcd_pltfrm_init - probe routine of the driver * @pdev: pointer to Platform device handle * @vops: pointer to variant ops * * Returns 0 on success, non-zero value on failure */ int ufshcd_pltfrm_init(struct platform_device *pdev, struct ufs_hba_variant_ops *vops) { struct ufs_hba *hba; void __iomem *mmio_base; struct resource *mem_res; int irq, err; struct device *dev = &pdev->dev; mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); mmio_base = devm_ioremap_resource(dev, mem_res); if (IS_ERR(*(void **)&mmio_base)) { err = PTR_ERR(*(void **)&mmio_base); goto out; } irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "IRQ resource not available\n"); err = -ENODEV; goto out; } err = ufshcd_alloc_host(dev, &hba); if (err) { dev_err(&pdev->dev, "Allocation failed\n"); goto out; } hba->vops = vops; err = ufshcd_parse_clock_info(hba); if (err) { dev_err(&pdev->dev, "%s: clock parse failed %d\n", __func__, err); goto dealloc_host; } err = ufshcd_parse_regulator_info(hba); if (err) { dev_err(&pdev->dev, "%s: regulator init failed %d\n", __func__, err); goto dealloc_host; } pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); err = ufshcd_init(hba, mmio_base, irq); if (err) { dev_err(dev, "Intialization failed\n"); goto out_disable_rpm; } platform_set_drvdata(pdev, hba); return 0; out_disable_rpm: pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); dealloc_host: ufshcd_dealloc_host(hba); out: return err; } EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init); MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>"); MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>"); MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(UFSHCD_DRIVER_VERSION);