^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) // Exynos Generic power domain support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) // Copyright (c) 2012 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) // http://www.samsung.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) //
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) // Implementation of Exynos specific power domain control which is used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) // conjunction with runtime-pm. Support for both device-tree and non-device-tree
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) // based power domain support is included.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/pm_domain.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct exynos_pm_domain_config {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Value for LOCAL_PWR_CFG and STATUS fields for each domain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) u32 local_pwr_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Exynos specific wrapper around the generic power domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct exynos_pm_domain {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) bool is_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct generic_pm_domain pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) u32 local_pwr_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct exynos_pm_domain *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u32 timeout, pwr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) char *op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) pd = container_of(domain, struct exynos_pm_domain, pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) base = pd->base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) pwr = power_on ? pd->local_pwr_cfg : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) writel_relaxed(pwr, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Wait max 1ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) timeout = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) while ((readl_relaxed(base + 0x4) & pd->local_pwr_cfg) != pwr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (!timeout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) op = (power_on) ? "enable" : "disable";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) pr_err("Power domain %s %s failed\n", domain->name, op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) return -ETIMEDOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) timeout--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) cpu_relax();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) usleep_range(80, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static int exynos_pd_power_on(struct generic_pm_domain *domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return exynos_pd_power(domain, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int exynos_pd_power_off(struct generic_pm_domain *domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return exynos_pd_power(domain, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static const struct exynos_pm_domain_config exynos4210_cfg __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .local_pwr_cfg = 0x7,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static const struct exynos_pm_domain_config exynos5433_cfg __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .local_pwr_cfg = 0xf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static const struct of_device_id exynos_pm_domain_of_match[] __initconst = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .compatible = "samsung,exynos4210-pd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .data = &exynos4210_cfg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .compatible = "samsung,exynos5433-pd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .data = &exynos5433_cfg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static __init const char *exynos_get_domain_name(struct device_node *node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (of_property_read_string(node, "label", &name) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) name = kbasename(node->full_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return kstrdup_const(name, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static __init int exynos4_pm_init_power_domain(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for_each_matching_node_and_match(np, exynos_pm_domain_of_match, &match) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) const struct exynos_pm_domain_config *pm_domain_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct exynos_pm_domain *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) pm_domain_cfg = match->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) pd = kzalloc(sizeof(*pd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (!pd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) pd->pd.name = exynos_get_domain_name(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (!pd->pd.name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) kfree(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) pd->base = of_iomap(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!pd->base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) pr_warn("%s: failed to map memory\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) kfree_const(pd->pd.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) kfree(pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) pd->pd.power_off = exynos_pd_power_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) pd->pd.power_on = exynos_pd_power_on;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) pm_genpd_init(&pd->pd, NULL, !on);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) of_genpd_add_provider_simple(np, &pd->pd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Assign the child power domains to their parents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) for_each_matching_node(np, exynos_pm_domain_of_match) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct of_phandle_args child, parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) child.np = np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) child.args_count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (of_parse_phandle_with_args(np, "power-domains",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) "#power-domain-cells", 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) &parent) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (of_genpd_add_subdomain(&parent, &child))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) pr_warn("%pOF failed to add subdomain: %pOF\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) parent.np, child.np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) pr_info("%pOF has as child subdomain: %pOF.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) parent.np, child.np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) core_initcall(exynos4_pm_init_power_domain);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags