diff options
Diffstat (limited to 'drivers/soc/renesas/rcar-sysc.c')
| -rw-r--r-- | drivers/soc/renesas/rcar-sysc.c | 433 |
1 files changed, 0 insertions, 433 deletions
diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c deleted file mode 100644 index 7c8da3c90011..000000000000 --- a/drivers/soc/renesas/rcar-sysc.c +++ /dev/null @@ -1,433 +0,0 @@ -/* - * R-Car SYSC Power management support - * - * Copyright (C) 2014 Magnus Damm - * Copyright (C) 2015-2017 Glider bvba - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ - -#include <linux/clk/renesas.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/mm.h> -#include <linux/of_address.h> -#include <linux/pm_domain.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/io.h> -#include <linux/soc/renesas/rcar-sysc.h> - -#include "rcar-sysc.h" - -/* SYSC Common */ -#define SYSCSR 0x00 /* SYSC Status Register */ -#define SYSCISR 0x04 /* Interrupt Status Register */ -#define SYSCISCR 0x08 /* Interrupt Status Clear Register */ -#define SYSCIER 0x0c /* Interrupt Enable Register */ -#define SYSCIMR 0x10 /* Interrupt Mask Register */ - -/* SYSC Status Register */ -#define SYSCSR_PONENB 1 /* Ready for power resume requests */ -#define SYSCSR_POFFENB 0 /* Ready for power shutoff requests */ - -/* - * Power Control Register Offsets inside the register block for each domain - * Note: The "CR" registers for ARM cores exist on H1 only - * Use WFI to power off, CPG/APMU to resume ARM cores on R-Car Gen2 - * Use PSCI on R-Car Gen3 - */ -#define PWRSR_OFFS 0x00 /* Power Status Register */ -#define PWROFFCR_OFFS 0x04 /* Power Shutoff Control Register */ -#define PWROFFSR_OFFS 0x08 /* Power Shutoff Status Register */ -#define PWRONCR_OFFS 0x0c /* Power Resume Control Register */ -#define PWRONSR_OFFS 0x10 /* Power Resume Status Register */ -#define PWRER_OFFS 0x14 /* Power Shutoff/Resume Error */ - - -#define SYSCSR_RETRIES 100 -#define SYSCSR_DELAY_US 1 - -#define PWRER_RETRIES 100 -#define PWRER_DELAY_US 1 - -#define SYSCISR_RETRIES 1000 -#define SYSCISR_DELAY_US 1 - -#define RCAR_PD_ALWAYS_ON 32 /* Always-on power area */ - -static void __iomem *rcar_sysc_base; -static DEFINE_SPINLOCK(rcar_sysc_lock); /* SMP CPUs + I/O devices */ - -static int rcar_sysc_pwr_on_off(const struct rcar_sysc_ch *sysc_ch, bool on) -{ - unsigned int sr_bit, reg_offs; - int k; - - if (on) { - sr_bit = SYSCSR_PONENB; - reg_offs = PWRONCR_OFFS; - } else { - sr_bit = SYSCSR_POFFENB; - reg_offs = PWROFFCR_OFFS; - } - - /* Wait until SYSC is ready to accept a power request */ - for (k = 0; k < SYSCSR_RETRIES; k++) { - if (ioread32(rcar_sysc_base + SYSCSR) & BIT(sr_bit)) - break; - udelay(SYSCSR_DELAY_US); - } - - if (k == SYSCSR_RETRIES) - return -EAGAIN; - - /* Submit power shutoff or power resume request */ - iowrite32(BIT(sysc_ch->chan_bit), - rcar_sysc_base + sysc_ch->chan_offs + reg_offs); - - return 0; -} - -static int rcar_sysc_power(const struct rcar_sysc_ch *sysc_ch, bool on) -{ - unsigned int isr_mask = BIT(sysc_ch->isr_bit); - unsigned int chan_mask = BIT(sysc_ch->chan_bit); - unsigned int status; - unsigned long flags; - int ret = 0; - int k; - - spin_lock_irqsave(&rcar_sysc_lock, flags); - - iowrite32(isr_mask, rcar_sysc_base + SYSCISCR); - - /* Submit power shutoff or resume request until it was accepted */ - for (k = 0; k < PWRER_RETRIES; k++) { - ret = rcar_sysc_pwr_on_off(sysc_ch, on); - if (ret) - goto out; - - status = ioread32(rcar_sysc_base + - sysc_ch->chan_offs + PWRER_OFFS); - if (!(status & chan_mask)) - break; - - udelay(PWRER_DELAY_US); - } - - if (k == PWRER_RETRIES) { - ret = -EIO; - goto out; - } - - /* Wait until the power shutoff or resume request has completed * */ - for (k = 0; k < SYSCISR_RETRIES; k++) { - if (ioread32(rcar_sysc_base + SYSCISR) & isr_mask) - break; - udelay(SYSCISR_DELAY_US); - } - - if (k == SYSCISR_RETRIES) - ret = -EIO; - - iowrite32(isr_mask, rcar_sysc_base + SYSCISCR); - - out: - spin_unlock_irqrestore(&rcar_sysc_lock, flags); - - pr_debug("sysc power %s domain %d: %08x -> %d\n", on ? "on" : "off", - sysc_ch->isr_bit, ioread32(rcar_sysc_base + SYSCISR), ret); - return ret; -} - -int rcar_sysc_power_down(const struct rcar_sysc_ch *sysc_ch) -{ - return rcar_sysc_power(sysc_ch, false); -} - -int rcar_sysc_power_up(const struct rcar_sysc_ch *sysc_ch) -{ - return rcar_sysc_power(sysc_ch, true); -} - -static bool rcar_sysc_power_is_off(const struct rcar_sysc_ch *sysc_ch) -{ - unsigned int st; - - st = ioread32(rcar_sysc_base + sysc_ch->chan_offs + PWRSR_OFFS); - if (st & BIT(sysc_ch->chan_bit)) - return true; - - return false; -} - -struct rcar_sysc_pd { - struct generic_pm_domain genpd; - struct rcar_sysc_ch ch; - unsigned int flags; - char name[0]; -}; - -static inline struct rcar_sysc_pd *to_rcar_pd(struct generic_pm_domain *d) -{ - return container_of(d, struct rcar_sysc_pd, genpd); -} - -static int rcar_sysc_pd_power_off(struct generic_pm_domain *genpd) -{ - struct rcar_sysc_pd *pd = to_rcar_pd(genpd); - - pr_debug("%s: %s\n", __func__, genpd->name); - return rcar_sysc_power_down(&pd->ch); -} - -static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd) -{ - struct rcar_sysc_pd *pd = to_rcar_pd(genpd); - - pr_debug("%s: %s\n", __func__, genpd->name); - return rcar_sysc_power_up(&pd->ch); -} - -static bool has_cpg_mstp; - -static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd) -{ - struct generic_pm_domain *genpd = &pd->genpd; - const char *name = pd->genpd.name; - struct dev_power_governor *gov = &simple_qos_governor; - - if (pd->flags & PD_CPU) { - /* - * This domain contains a CPU core and therefore it should - * only be turned off if the CPU is not in use. - */ - pr_debug("PM domain %s contains %s\n", name, "CPU"); - genpd->flags |= GENPD_FLAG_ALWAYS_ON; - } else if (pd->flags & PD_SCU) { - /* - * This domain contains an SCU and cache-controller, and - * therefore it should only be turned off if the CPU cores are - * not in use. - */ - pr_debug("PM domain %s contains %s\n", name, "SCU"); - genpd->flags |= GENPD_FLAG_ALWAYS_ON; - } else if (pd->flags & PD_NO_CR) { - /* - * This domain cannot be turned off. - */ - genpd->flags |= GENPD_FLAG_ALWAYS_ON; - } - - if (!(pd->flags & (PD_CPU | PD_SCU))) { - /* Enable Clock Domain for I/O devices */ - genpd->flags |= GENPD_FLAG_PM_CLK; - if (has_cpg_mstp) { - genpd->attach_dev = cpg_mstp_attach_dev; - genpd->detach_dev = cpg_mstp_detach_dev; - } else { - genpd->attach_dev = cpg_mssr_attach_dev; - genpd->detach_dev = cpg_mssr_detach_dev; - } - } - - genpd->power_off = rcar_sysc_pd_power_off; - genpd->power_on = rcar_sysc_pd_power_on; - - if (pd->flags & (PD_CPU | PD_NO_CR)) { - /* Skip CPUs (handled by SMP code) and areas without control */ - pr_debug("%s: Not touching %s\n", __func__, genpd->name); - goto finalize; - } - - if (!rcar_sysc_power_is_off(&pd->ch)) { - pr_debug("%s: %s is already powered\n", __func__, genpd->name); - goto finalize; - } - - rcar_sysc_power_up(&pd->ch); - -finalize: - pm_genpd_init(genpd, gov, false); -} - -static const struct of_device_id rcar_sysc_matches[] = { -#ifdef CONFIG_SYSC_R8A7743 - { .compatible = "renesas,r8a7743-sysc", .data = &r8a7743_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7745 - { .compatible = "renesas,r8a7745-sysc", .data = &r8a7745_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7779 - { .compatible = "renesas,r8a7779-sysc", .data = &r8a7779_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7790 - { .compatible = "renesas,r8a7790-sysc", .data = &r8a7790_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7791 - { .compatible = "renesas,r8a7791-sysc", .data = &r8a7791_sysc_info }, - /* R-Car M2-N is identical to R-Car M2-W w.r.t. power domains. */ - { .compatible = "renesas,r8a7793-sysc", .data = &r8a7791_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7792 - { .compatible = "renesas,r8a7792-sysc", .data = &r8a7792_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7794 - { .compatible = "renesas,r8a7794-sysc", .data = &r8a7794_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7795 - { .compatible = "renesas,r8a7795-sysc", .data = &r8a7795_sysc_info }, -#endif -#ifdef CONFIG_SYSC_R8A7796 - { .compatible = "renesas,r8a7796-sysc", .data = &r8a7796_sysc_info }, -#endif - { /* sentinel */ } -}; - -struct rcar_pm_domains { - struct genpd_onecell_data onecell_data; - struct generic_pm_domain *domains[RCAR_PD_ALWAYS_ON + 1]; -}; - -static int __init rcar_sysc_pd_init(void) -{ - const struct rcar_sysc_info *info; - const struct of_device_id *match; - struct rcar_pm_domains *domains; - struct device_node *np; - u32 syscier, syscimr; - void __iomem *base; - unsigned int i; - int error; - - if (rcar_sysc_base) - return 0; - - np = of_find_matching_node_and_match(NULL, rcar_sysc_matches, &match); - if (!np) - return -ENODEV; - - info = match->data; - - if (info->init) { - error = info->init(); - if (error) - return error; - } - - has_cpg_mstp = of_find_compatible_node(NULL, NULL, - "renesas,cpg-mstp-clocks"); - - base = of_iomap(np, 0); - if (!base) { - pr_warn("%s: Cannot map regs\n", np->full_name); - error = -ENOMEM; - goto out_put; - } - - rcar_sysc_base = base; - - domains = kzalloc(sizeof(*domains), GFP_KERNEL); - if (!domains) { - error = -ENOMEM; - goto out_put; - } - - domains->onecell_data.domains = domains->domains; - domains->onecell_data.num_domains = ARRAY_SIZE(domains->domains); - - for (i = 0, syscier = 0; i < info->num_areas; i++) - syscier |= BIT(info->areas[i].isr_bit); - - /* - * Mask all interrupt sources to prevent the CPU from receiving them. - * Make sure not to clear reserved bits that were set before. - */ - syscimr = ioread32(base + SYSCIMR); - syscimr |= syscier; - pr_debug("%s: syscimr = 0x%08x\n", np->full_name, syscimr); - iowrite32(syscimr, base + SYSCIMR); - - /* - * SYSC needs all interrupt sources enabled to control power. - */ - pr_debug("%s: syscier = 0x%08x\n", np->full_name, syscier); - iowrite32(syscier, base + SYSCIER); - - for (i = 0; i < info->num_areas; i++) { - const struct rcar_sysc_area *area = &info->areas[i]; - struct rcar_sysc_pd *pd; - - if (!area->name) { - /* Skip NULLified area */ - continue; - } - - pd = kzalloc(sizeof(*pd) + strlen(area->name) + 1, GFP_KERNEL); - if (!pd) { - error = -ENOMEM; - goto out_put; - } - - strcpy(pd->name, area->name); - pd->genpd.name = pd->name; - pd->ch.chan_offs = area->chan_offs; - pd->ch.chan_bit = area->chan_bit; - pd->ch.isr_bit = area->isr_bit; - pd->flags = area->flags; - - rcar_sysc_pd_setup(pd); - if (area->parent >= 0) - pm_genpd_add_subdomain(domains->domains[area->parent], - &pd->genpd); - - domains->domains[area->isr_bit] = &pd->genpd; - } - - error = of_genpd_add_provider_onecell(np, &domains->onecell_data); - -out_put: - of_node_put(np); - return error; -} -early_initcall(rcar_sysc_pd_init); - -void __init rcar_sysc_nullify(struct rcar_sysc_area *areas, - unsigned int num_areas, u8 id) -{ - unsigned int i; - - for (i = 0; i < num_areas; i++) - if (areas[i].isr_bit == id) { - areas[i].name = NULL; - return; - } -} - -void __init rcar_sysc_init(phys_addr_t base, u32 syscier) -{ - u32 syscimr; - - if (!rcar_sysc_pd_init()) - return; - - rcar_sysc_base = ioremap_nocache(base, PAGE_SIZE); - - /* - * Mask all interrupt sources to prevent the CPU from receiving them. - * Make sure not to clear reserved bits that were set before. - */ - syscimr = ioread32(rcar_sysc_base + SYSCIMR); - syscimr |= syscier; - pr_debug("%s: syscimr = 0x%08x\n", __func__, syscimr); - iowrite32(syscimr, rcar_sysc_base + SYSCIMR); - - /* - * SYSC needs all interrupt sources enabled to control power. - */ - pr_debug("%s: syscier = 0x%08x\n", __func__, syscier); - iowrite32(syscier, rcar_sysc_base + SYSCIER); -} |