1 // SPDX-License-Identifier: GPL-2.0-only
3  * Allwinner PCK-600 power domain support
5  * Copyright (c) 2025 Chen-Yu Tsai <wens@csie.org>
7  * The hardware is likely based on the Arm PCK-600 IP, since some of
12  * - "Arm CoreLink PCK-600 Power Control Kit" TRM
13  * - "Arm Power Policy Unit" architecture specification (DEN0051E)
22 #include <linux/io.h>
73 	struct sunxi_pck600 *pck = pd->pck;  in sunxi_pck600_pd_set_power()
74 	struct generic_pm_domain *genpd = &pd->genpd;  in sunxi_pck600_pd_set_power()
80 	reg = readl(pd->base + PPU_PWPR);  in sunxi_pck600_pd_set_power()
82 	writel(reg, pd->base + PPU_PWPR);  in sunxi_pck600_pd_set_power()
85 	reg = readl(pd->base + PPU_PWPR);  in sunxi_pck600_pd_set_power()
87 	ret = readl_poll_timeout_atomic(pd->base + PPU_PWSR, reg,  in sunxi_pck600_pd_set_power()
91 		dev_err(pck->dev, "failed to turn domain \"%s\" %s: %d\n",  in sunxi_pck600_pd_set_power()
92 			genpd->name, str_on_off(on), ret);  in sunxi_pck600_pd_set_power()
114 	writel(desc->device_ctrl0_delay, pd->base + PPU_DCDR0);  in sunxi_pck600_pd_setup()
115 	writel(desc->device_ctrl1_delay, pd->base + PPU_DCDR1);  in sunxi_pck600_pd_setup()
116 	writel(desc->logic_power_switch0_delay,  in sunxi_pck600_pd_setup()
117 	       pd->base + desc->logic_power_switch0_delay_offset);  in sunxi_pck600_pd_setup()
118 	writel(desc->logic_power_switch1_delay,  in sunxi_pck600_pd_setup()
119 	       pd->base + desc->logic_power_switch1_delay_offset);  in sunxi_pck600_pd_setup()
120 	writel(desc->off2on_delay, pd->base + desc->off2on_delay_offset);  in sunxi_pck600_pd_setup()
125 	struct device *dev = &pdev->dev;  in sunxi_pck600_probe()
136 	pck = devm_kzalloc(dev, struct_size(pck, pds, desc->num_domains), GFP_KERNEL);  in sunxi_pck600_probe()
138 		return -ENOMEM;  in sunxi_pck600_probe()
140 	pck->dev = &pdev->dev;  in sunxi_pck600_probe()
143 	genpds = &pck->genpd_data;  in sunxi_pck600_probe()
144 	genpds->num_domains = desc->num_domains;  in sunxi_pck600_probe()
145 	genpds->domains = devm_kcalloc(dev, desc->num_domains,  in sunxi_pck600_probe()
146 				       sizeof(*genpds->domains), GFP_KERNEL);  in sunxi_pck600_probe()
147 	if (!genpds->domains)  in sunxi_pck600_probe()
148 		return -ENOMEM;  in sunxi_pck600_probe()
162 	for (i = 0; i < desc->num_domains; i++) {  in sunxi_pck600_probe()
163 		struct sunxi_pck600_pd *pd = &pck->pds[i];  in sunxi_pck600_probe()
165 		pd->genpd.name = desc->pd_names[i];  in sunxi_pck600_probe()
166 		pd->genpd.power_off = sunxi_pck600_power_off;  in sunxi_pck600_probe()
167 		pd->genpd.power_on = sunxi_pck600_power_on;  in sunxi_pck600_probe()
168 		pd->base = base + PPU_REG_SIZE * i;  in sunxi_pck600_probe()
171 		ret = pm_genpd_init(&pd->genpd, NULL, false);  in sunxi_pck600_probe()
177 		genpds->domains[i] = &pd->genpd;  in sunxi_pck600_probe()
189 	for (i--; i >= 0; i--)  in sunxi_pck600_probe()
190 		pm_genpd_remove(genpds->domains[i]);  in sunxi_pck600_probe()
214 		.compatible	= "allwinner,sun55i-a523-pck-600",
224 		.name   = "sunxi-pck-600",
226 		/* Power domains cannot be removed if in use. */
232 MODULE_DESCRIPTION("Allwinner PCK-600 power domain driver");
233 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");