1 // SPDX-License-Identifier: GPL-2.0-only
3  * DDR Self-Refresh Power Down (SRPD) support for Broadcom STB SoCs
37 static int brcmstb_memc_uses_lpddr4(struct brcmstb_memc *memc)  in brcmstb_memc_uses_lpddr4()  argument
39 	void __iomem *config = memc->ddr_ctrl + REG_MEMC_CNTRLR_CONFIG;  in brcmstb_memc_uses_lpddr4()
47 static int brcmstb_memc_srpd_config(struct brcmstb_memc *memc,  in brcmstb_memc_srpd_config()  argument
50 	void __iomem *cfg = memc->ddr_ctrl + memc->srpd_offset;  in brcmstb_memc_srpd_config()
55 		return -EINVAL;  in brcmstb_memc_srpd_config()
57 	memc->timeout_cycles = cycles;  in brcmstb_memc_srpd_config()
73 	struct brcmstb_memc *memc = dev_get_drvdata(dev);  in frequency_show()  local
75 	return sprintf(buf, "%d\n", memc->frequency);  in frequency_show()
81 	struct brcmstb_memc *memc = dev_get_drvdata(dev);  in srpd_show()  local
83 	return sprintf(buf, "%d\n", memc->timeout_cycles);  in srpd_show()
89 	struct brcmstb_memc *memc = dev_get_drvdata(dev);  in srpd_store()  local
98 	if (brcmstb_memc_uses_lpddr4(memc))  in srpd_store()
99 		return -EOPNOTSUPP;  in srpd_store()
105 	ret = brcmstb_memc_srpd_config(memc, val);  in srpd_store()
128 	struct device *dev = &pdev->dev;  in brcmstb_memc_probe()
129 	struct brcmstb_memc *memc;  in brcmstb_memc_probe()  local
132 	memc = devm_kzalloc(dev, sizeof(*memc), GFP_KERNEL);  in brcmstb_memc_probe()
133 	if (!memc)  in brcmstb_memc_probe()
134 		return -ENOMEM;  in brcmstb_memc_probe()
136 	dev_set_drvdata(dev, memc);  in brcmstb_memc_probe()
139 	memc->srpd_offset = memc_data->srpd_offset;  in brcmstb_memc_probe()
141 	memc->ddr_ctrl = devm_platform_ioremap_resource(pdev, 0);  in brcmstb_memc_probe()
142 	if (IS_ERR(memc->ddr_ctrl))  in brcmstb_memc_probe()
143 		return PTR_ERR(memc->ddr_ctrl);  in brcmstb_memc_probe()
145 	of_property_read_u32(pdev->dev.of_node, "clock-frequency",  in brcmstb_memc_probe()
146 			     &memc->frequency);  in brcmstb_memc_probe()
148 	ret = sysfs_create_group(&dev->kobj, &dev_attr_group);  in brcmstb_memc_probe()
157 	struct device *dev = &pdev->dev;  in brcmstb_memc_remove()
159 	sysfs_remove_group(&dev->kobj, &dev_attr_group);  in brcmstb_memc_remove()
176 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.1.x",
180 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.0",
184 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.1",
188 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.2",
192 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.3",
196 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.5",
200 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.6",
204 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.7",
208 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.2.8",
212 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.0",
216 		.compatible = "brcm,brcmstb-memc-ddr-rev-b.3.1",
220 		.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.0",
224 		.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.1",
228 		.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.2",
232 		.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.3",
236 		.compatible = "brcm,brcmstb-memc-ddr-rev-c.1.4",
241 		.compatible = "brcm,brcmstb-memc-ddr",
250 	struct brcmstb_memc *memc = dev_get_drvdata(dev);  in brcmstb_memc_suspend()  local
251 	void __iomem *cfg = memc->ddr_ctrl + memc->srpd_offset;  in brcmstb_memc_suspend()
254 	if (memc->timeout_cycles == 0)  in brcmstb_memc_suspend()
273 	struct brcmstb_memc *memc = dev_get_drvdata(dev);  in brcmstb_memc_resume()  local
275 	if (memc->timeout_cycles == 0)  in brcmstb_memc_resume()
278 	return brcmstb_memc_srpd_config(memc, memc->timeout_cycles);  in brcmstb_memc_resume()
297 MODULE_DESCRIPTION("DDR SRPD driver for Broadcom STB chips");