![Ulf Hansson](/assets/img/avatar_default.png)
Genpd tries from a late_initcall to disable unused PM domains, which makes it unnecessary to also manage this from any earlier phase when for example initializing a genpd. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
412 lines
10 KiB
C
412 lines
10 KiB
C
/*
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* Marvell Dove PMU support
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*/
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/reset.h>
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#include <linux/reset-controller.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/soc/dove/pmu.h>
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#include <linux/spinlock.h>
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#define NR_PMU_IRQS 7
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#define PMC_SW_RST 0x30
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#define PMC_IRQ_CAUSE 0x50
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#define PMC_IRQ_MASK 0x54
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#define PMU_PWR 0x10
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#define PMU_ISO 0x58
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struct pmu_data {
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spinlock_t lock;
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struct device_node *of_node;
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void __iomem *pmc_base;
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void __iomem *pmu_base;
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struct irq_chip_generic *irq_gc;
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struct irq_domain *irq_domain;
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#ifdef CONFIG_RESET_CONTROLLER
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struct reset_controller_dev reset;
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#endif
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};
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/*
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* The PMU contains a register to reset various subsystems within the
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* SoC. Export this as a reset controller.
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*/
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#ifdef CONFIG_RESET_CONTROLLER
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#define rcdev_to_pmu(rcdev) container_of(rcdev, struct pmu_data, reset)
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static int pmu_reset_reset(struct reset_controller_dev *rc, unsigned long id)
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{
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struct pmu_data *pmu = rcdev_to_pmu(rc);
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&pmu->lock, flags);
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val = readl_relaxed(pmu->pmc_base + PMC_SW_RST);
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writel_relaxed(val & ~BIT(id), pmu->pmc_base + PMC_SW_RST);
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writel_relaxed(val | BIT(id), pmu->pmc_base + PMC_SW_RST);
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spin_unlock_irqrestore(&pmu->lock, flags);
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return 0;
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}
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static int pmu_reset_assert(struct reset_controller_dev *rc, unsigned long id)
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{
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struct pmu_data *pmu = rcdev_to_pmu(rc);
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unsigned long flags;
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u32 val = ~BIT(id);
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spin_lock_irqsave(&pmu->lock, flags);
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val &= readl_relaxed(pmu->pmc_base + PMC_SW_RST);
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writel_relaxed(val, pmu->pmc_base + PMC_SW_RST);
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spin_unlock_irqrestore(&pmu->lock, flags);
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return 0;
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}
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static int pmu_reset_deassert(struct reset_controller_dev *rc, unsigned long id)
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{
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struct pmu_data *pmu = rcdev_to_pmu(rc);
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unsigned long flags;
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u32 val = BIT(id);
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spin_lock_irqsave(&pmu->lock, flags);
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val |= readl_relaxed(pmu->pmc_base + PMC_SW_RST);
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writel_relaxed(val, pmu->pmc_base + PMC_SW_RST);
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spin_unlock_irqrestore(&pmu->lock, flags);
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return 0;
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}
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static struct reset_control_ops pmu_reset_ops = {
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.reset = pmu_reset_reset,
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.assert = pmu_reset_assert,
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.deassert = pmu_reset_deassert,
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};
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static struct reset_controller_dev pmu_reset __initdata = {
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.ops = &pmu_reset_ops,
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.owner = THIS_MODULE,
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.nr_resets = 32,
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};
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static void __init pmu_reset_init(struct pmu_data *pmu)
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{
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int ret;
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pmu->reset = pmu_reset;
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pmu->reset.of_node = pmu->of_node;
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ret = reset_controller_register(&pmu->reset);
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if (ret)
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pr_err("pmu: %s failed: %d\n", "reset_controller_register", ret);
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}
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#else
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static void __init pmu_reset_init(struct pmu_data *pmu)
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{
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}
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#endif
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struct pmu_domain {
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struct pmu_data *pmu;
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u32 pwr_mask;
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u32 rst_mask;
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u32 iso_mask;
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struct generic_pm_domain base;
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};
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#define to_pmu_domain(dom) container_of(dom, struct pmu_domain, base)
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/*
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* This deals with the "old" Marvell sequence of bringing a power domain
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* down/up, which is: apply power, release reset, disable isolators.
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*
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* Later devices apparantly use a different sequence: power up, disable
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* isolators, assert repair signal, enable SRMA clock, enable AXI clock,
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* enable module clock, deassert reset.
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*
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* Note: reading the assembly, it seems that the IO accessors have an
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* unfortunate side-effect - they cause memory already read into registers
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* for the if () to be re-read for the bit-set or bit-clear operation.
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* The code is written to avoid this.
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*/
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static int pmu_domain_power_off(struct generic_pm_domain *domain)
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{
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struct pmu_domain *pmu_dom = to_pmu_domain(domain);
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struct pmu_data *pmu = pmu_dom->pmu;
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unsigned long flags;
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unsigned int val;
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void __iomem *pmu_base = pmu->pmu_base;
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void __iomem *pmc_base = pmu->pmc_base;
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spin_lock_irqsave(&pmu->lock, flags);
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/* Enable isolators */
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if (pmu_dom->iso_mask) {
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val = ~pmu_dom->iso_mask;
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val &= readl_relaxed(pmu_base + PMU_ISO);
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writel_relaxed(val, pmu_base + PMU_ISO);
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}
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/* Reset unit */
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if (pmu_dom->rst_mask) {
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val = ~pmu_dom->rst_mask;
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val &= readl_relaxed(pmc_base + PMC_SW_RST);
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writel_relaxed(val, pmc_base + PMC_SW_RST);
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}
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/* Power down */
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val = readl_relaxed(pmu_base + PMU_PWR) | pmu_dom->pwr_mask;
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writel_relaxed(val, pmu_base + PMU_PWR);
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spin_unlock_irqrestore(&pmu->lock, flags);
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return 0;
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}
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static int pmu_domain_power_on(struct generic_pm_domain *domain)
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{
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struct pmu_domain *pmu_dom = to_pmu_domain(domain);
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struct pmu_data *pmu = pmu_dom->pmu;
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unsigned long flags;
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unsigned int val;
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void __iomem *pmu_base = pmu->pmu_base;
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void __iomem *pmc_base = pmu->pmc_base;
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spin_lock_irqsave(&pmu->lock, flags);
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/* Power on */
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val = ~pmu_dom->pwr_mask & readl_relaxed(pmu_base + PMU_PWR);
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writel_relaxed(val, pmu_base + PMU_PWR);
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/* Release reset */
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if (pmu_dom->rst_mask) {
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val = pmu_dom->rst_mask;
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val |= readl_relaxed(pmc_base + PMC_SW_RST);
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writel_relaxed(val, pmc_base + PMC_SW_RST);
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}
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/* Disable isolators */
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if (pmu_dom->iso_mask) {
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val = pmu_dom->iso_mask;
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val |= readl_relaxed(pmu_base + PMU_ISO);
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writel_relaxed(val, pmu_base + PMU_ISO);
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}
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spin_unlock_irqrestore(&pmu->lock, flags);
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return 0;
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}
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static void __pmu_domain_register(struct pmu_domain *domain,
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struct device_node *np)
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{
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unsigned int val = readl_relaxed(domain->pmu->pmu_base + PMU_PWR);
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domain->base.power_off = pmu_domain_power_off;
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domain->base.power_on = pmu_domain_power_on;
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pm_genpd_init(&domain->base, NULL, !(val & domain->pwr_mask));
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if (np)
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of_genpd_add_provider_simple(np, &domain->base);
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}
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/* PMU IRQ controller */
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static void pmu_irq_handler(struct irq_desc *desc)
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{
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struct pmu_data *pmu = irq_desc_get_handler_data(desc);
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struct irq_chip_generic *gc = pmu->irq_gc;
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struct irq_domain *domain = pmu->irq_domain;
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void __iomem *base = gc->reg_base;
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u32 stat = readl_relaxed(base + PMC_IRQ_CAUSE) & gc->mask_cache;
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u32 done = ~0;
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if (stat == 0) {
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handle_bad_irq(desc);
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return;
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}
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while (stat) {
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u32 hwirq = fls(stat) - 1;
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stat &= ~(1 << hwirq);
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done &= ~(1 << hwirq);
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generic_handle_irq(irq_find_mapping(domain, hwirq));
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}
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/*
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* The PMU mask register is not RW0C: it is RW. This means that
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* the bits take whatever value is written to them; if you write
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* a '1', you will set the interrupt.
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*
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* Unfortunately this means there is NO race free way to clear
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* these interrupts.
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*
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* So, let's structure the code so that the window is as small as
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* possible.
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*/
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irq_gc_lock(gc);
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done &= readl_relaxed(base + PMC_IRQ_CAUSE);
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writel_relaxed(done, base + PMC_IRQ_CAUSE);
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irq_gc_unlock(gc);
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}
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static int __init dove_init_pmu_irq(struct pmu_data *pmu, int irq)
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{
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const char *name = "pmu_irq";
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struct irq_chip_generic *gc;
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struct irq_domain *domain;
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int ret;
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/* mask and clear all interrupts */
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writel(0, pmu->pmc_base + PMC_IRQ_MASK);
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writel(0, pmu->pmc_base + PMC_IRQ_CAUSE);
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domain = irq_domain_add_linear(pmu->of_node, NR_PMU_IRQS,
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&irq_generic_chip_ops, NULL);
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if (!domain) {
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pr_err("%s: unable to add irq domain\n", name);
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return -ENOMEM;
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}
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ret = irq_alloc_domain_generic_chips(domain, NR_PMU_IRQS, 1, name,
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handle_level_irq,
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IRQ_NOREQUEST | IRQ_NOPROBE, 0,
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IRQ_GC_INIT_MASK_CACHE);
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if (ret) {
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pr_err("%s: unable to alloc irq domain gc: %d\n", name, ret);
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irq_domain_remove(domain);
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return ret;
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}
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gc = irq_get_domain_generic_chip(domain, 0);
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gc->reg_base = pmu->pmc_base;
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gc->chip_types[0].regs.mask = PMC_IRQ_MASK;
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gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
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gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
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pmu->irq_domain = domain;
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pmu->irq_gc = gc;
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irq_set_handler_data(irq, pmu);
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irq_set_chained_handler(irq, pmu_irq_handler);
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return 0;
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}
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/*
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* pmu: power-manager@d0000 {
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* compatible = "marvell,dove-pmu";
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* reg = <0xd0000 0x8000> <0xd8000 0x8000>;
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* interrupts = <33>;
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* interrupt-controller;
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* #reset-cells = 1;
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* vpu_domain: vpu-domain {
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* #power-domain-cells = <0>;
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* marvell,pmu_pwr_mask = <0x00000008>;
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* marvell,pmu_iso_mask = <0x00000001>;
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* resets = <&pmu 16>;
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* };
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* gpu_domain: gpu-domain {
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* #power-domain-cells = <0>;
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* marvell,pmu_pwr_mask = <0x00000004>;
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* marvell,pmu_iso_mask = <0x00000002>;
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* resets = <&pmu 18>;
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* };
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* };
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*/
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int __init dove_init_pmu(void)
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{
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struct device_node *np_pmu, *domains_node, *np;
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struct pmu_data *pmu;
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int ret, parent_irq;
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/* Lookup the PMU node */
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np_pmu = of_find_compatible_node(NULL, NULL, "marvell,dove-pmu");
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if (!np_pmu)
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return 0;
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domains_node = of_get_child_by_name(np_pmu, "domains");
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if (!domains_node) {
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pr_err("%s: failed to find domains sub-node\n", np_pmu->name);
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return 0;
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}
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pmu = kzalloc(sizeof(*pmu), GFP_KERNEL);
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if (!pmu)
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return -ENOMEM;
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spin_lock_init(&pmu->lock);
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pmu->of_node = np_pmu;
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pmu->pmc_base = of_iomap(pmu->of_node, 0);
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pmu->pmu_base = of_iomap(pmu->of_node, 1);
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if (!pmu->pmc_base || !pmu->pmu_base) {
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pr_err("%s: failed to map PMU\n", np_pmu->name);
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iounmap(pmu->pmu_base);
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iounmap(pmu->pmc_base);
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kfree(pmu);
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return -ENOMEM;
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}
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pmu_reset_init(pmu);
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for_each_available_child_of_node(domains_node, np) {
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struct of_phandle_args args;
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struct pmu_domain *domain;
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domain = kzalloc(sizeof(*domain), GFP_KERNEL);
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if (!domain)
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break;
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domain->pmu = pmu;
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domain->base.name = kstrdup(np->name, GFP_KERNEL);
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if (!domain->base.name) {
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kfree(domain);
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break;
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}
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of_property_read_u32(np, "marvell,pmu_pwr_mask",
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&domain->pwr_mask);
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of_property_read_u32(np, "marvell,pmu_iso_mask",
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&domain->iso_mask);
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/*
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* We parse the reset controller property directly here
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* to ensure that we can operate when the reset controller
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* support is not configured into the kernel.
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*/
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ret = of_parse_phandle_with_args(np, "resets", "#reset-cells",
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0, &args);
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if (ret == 0) {
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if (args.np == pmu->of_node)
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domain->rst_mask = BIT(args.args[0]);
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of_node_put(args.np);
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}
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__pmu_domain_register(domain, np);
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}
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/* Loss of the interrupt controller is not a fatal error. */
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parent_irq = irq_of_parse_and_map(pmu->of_node, 0);
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if (!parent_irq) {
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pr_err("%s: no interrupt specified\n", np_pmu->name);
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} else {
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ret = dove_init_pmu_irq(pmu, parent_irq);
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if (ret)
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pr_err("dove_init_pmu_irq() failed: %d\n", ret);
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}
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return 0;
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}
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