diff options
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/ti-sysc.c | 526 |
1 files changed, 493 insertions, 33 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index cdaeeea7999c..7cd2fd04b212 100644 --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -13,22 +13,20 @@ #include <linux/io.h> #include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/delay.h> #include <linux/module.h> #include <linux/platform_device.h> +#include <linux/pm_domain.h> #include <linux/pm_runtime.h> #include <linux/of_address.h> #include <linux/of_platform.h> +#include <linux/slab.h> + #include <linux/platform_data/ti-sysc.h> #include <dt-bindings/bus/ti-sysc.h> -enum sysc_registers { - SYSC_REVISION, - SYSC_SYSCONFIG, - SYSC_SYSSTATUS, - SYSC_MAX_REGS, -}; - static const char * const reg_names[] = { "rev", "sysc", "syss", }; enum sysc_clocks { @@ -55,6 +53,7 @@ static const char * const clock_names[] = { "fck", "ick", }; * @cfg: interconnect target module configuration * @name: name if available * @revision: interconnect target module revision + * @needs_resume: runtime resume needed on resume from suspend */ struct sysc { struct device *dev; @@ -66,8 +65,13 @@ struct sysc { const char *legacy_mode; const struct sysc_capabilities *cap; struct sysc_config cfg; + struct ti_sysc_cookie cookie; const char *name; u32 revision; + bool enabled; + bool needs_resume; + bool child_needs_resume; + struct delayed_work idle_work; }; static u32 sysc_read(struct sysc *ddata, int offset) @@ -136,9 +140,6 @@ static int sysc_get_clocks(struct sysc *ddata) { int i, error; - if (ddata->legacy_mode) - return 0; - for (i = 0; i < SYSC_MAX_CLOCKS; i++) { error = sysc_get_one_clock(ddata, i); if (error && error != -ENOENT) @@ -197,12 +198,53 @@ static int sysc_parse_and_check_child_range(struct sysc *ddata) ddata->module_pa = of_translate_address(np, ranges++); ddata->module_size = be32_to_cpup(ranges); - dev_dbg(ddata->dev, "interconnect target 0x%llx size 0x%x for %pOF\n", - ddata->module_pa, ddata->module_size, np); - return 0; } +static struct device_node *stdout_path; + +static void sysc_init_stdout_path(struct sysc *ddata) +{ + struct device_node *np = NULL; + const char *uart; + + if (IS_ERR(stdout_path)) + return; + + if (stdout_path) + return; + + np = of_find_node_by_path("/chosen"); + if (!np) + goto err; + + uart = of_get_property(np, "stdout-path", NULL); + if (!uart) + goto err; + + np = of_find_node_by_path(uart); + if (!np) + goto err; + + stdout_path = np; + + return; + +err: + stdout_path = ERR_PTR(-ENODEV); +} + +static void sysc_check_quirk_stdout(struct sysc *ddata, + struct device_node *np) +{ + sysc_init_stdout_path(ddata); + if (np != stdout_path) + return; + + ddata->cfg.quirks |= SYSC_QUIRK_NO_IDLE_ON_INIT | + SYSC_QUIRK_NO_RESET_ON_INIT; +} + /** * sysc_check_one_child - check child configuration * @ddata: device driver data @@ -221,6 +263,8 @@ static int sysc_check_one_child(struct sysc *ddata, if (name) dev_warn(ddata->dev, "really a child ti,hwmods property?"); + sysc_check_quirk_stdout(ddata, np); + return 0; } @@ -246,11 +290,8 @@ static int sysc_check_children(struct sysc *ddata) */ static void sysc_check_quirk_16bit(struct sysc *ddata, struct resource *res) { - if (resource_size(res) == 8) { - dev_dbg(ddata->dev, - "enabling 16-bit and clockactivity quirks\n"); + if (resource_size(res) == 8) ddata->cfg.quirks |= SYSC_QUIRK_16BIT | SYSC_QUIRK_USE_CLOCKACT; - } } /** @@ -276,7 +317,6 @@ static int sysc_parse_one(struct sysc *ddata, enum sysc_registers reg) res = platform_get_resource_byname(to_platform_device(ddata->dev), IORESOURCE_MEM, name); if (!res) { - dev_dbg(ddata->dev, "has no %s register\n", name); ddata->offsets[reg] = -ENODEV; return 0; @@ -437,6 +477,14 @@ static int sysc_show_reg(struct sysc *ddata, return sprintf(bufp, ":%x", ddata->offsets[reg]); } +static int sysc_show_name(char *bufp, struct sysc *ddata) +{ + if (!ddata->name) + return 0; + + return sprintf(bufp, ":%s", ddata->name); +} + /** * sysc_show_registers - show information about interconnect target module * @ddata: device driver data @@ -451,6 +499,7 @@ static void sysc_show_registers(struct sysc *ddata) bufp += sysc_show_reg(ddata, bufp, i); bufp += sysc_show_rev(bufp, ddata); + bufp += sysc_show_name(bufp, ddata); dev_dbg(ddata->dev, "%llx:%x%s\n", ddata->module_pa, ddata->module_size, @@ -459,33 +508,70 @@ static void sysc_show_registers(struct sysc *ddata) static int __maybe_unused sysc_runtime_suspend(struct device *dev) { + struct ti_sysc_platform_data *pdata; struct sysc *ddata; - int i; + int error = 0, i; ddata = dev_get_drvdata(dev); - if (ddata->legacy_mode) + if (!ddata->enabled) return 0; + if (ddata->legacy_mode) { + pdata = dev_get_platdata(ddata->dev); + if (!pdata) + return 0; + + if (!pdata->idle_module) + return -ENODEV; + + error = pdata->idle_module(dev, &ddata->cookie); + if (error) + dev_err(dev, "%s: could not idle: %i\n", + __func__, error); + + goto idled; + } + for (i = 0; i < SYSC_MAX_CLOCKS; i++) { if (IS_ERR_OR_NULL(ddata->clocks[i])) continue; clk_disable(ddata->clocks[i]); } - return 0; +idled: + ddata->enabled = false; + + return error; } static int __maybe_unused sysc_runtime_resume(struct device *dev) { + struct ti_sysc_platform_data *pdata; struct sysc *ddata; - int i, error; + int error = 0, i; ddata = dev_get_drvdata(dev); - if (ddata->legacy_mode) + if (ddata->enabled) return 0; + if (ddata->legacy_mode) { + pdata = dev_get_platdata(ddata->dev); + if (!pdata) + return 0; + + if (!pdata->enable_module) + return -ENODEV; + + error = pdata->enable_module(dev, &ddata->cookie); + if (error) + dev_err(dev, "%s: could not enable: %i\n", + __func__, error); + + goto awake; + } + for (i = 0; i < SYSC_MAX_CLOCKS; i++) { if (IS_ERR_OR_NULL(ddata->clocks[i])) continue; @@ -494,20 +580,136 @@ static int __maybe_unused sysc_runtime_resume(struct device *dev) return error; } +awake: + ddata->enabled = true; + + return error; +} + +#ifdef CONFIG_PM_SLEEP +static int sysc_suspend(struct device *dev) +{ + struct sysc *ddata; + + ddata = dev_get_drvdata(dev); + + if (!ddata->enabled) + return 0; + + ddata->needs_resume = true; + + return sysc_runtime_suspend(dev); +} + +static int sysc_resume(struct device *dev) +{ + struct sysc *ddata; + + ddata = dev_get_drvdata(dev); + if (ddata->needs_resume) { + ddata->needs_resume = false; + + return sysc_runtime_resume(dev); + } + return 0; } +#endif static const struct dev_pm_ops sysc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(sysc_suspend, sysc_resume) SET_RUNTIME_PM_OPS(sysc_runtime_suspend, sysc_runtime_resume, NULL) }; +/* Module revision register based quirks */ +struct sysc_revision_quirk { + const char *name; + u32 base; + int rev_offset; + int sysc_offset; + int syss_offset; + u32 revision; + u32 revision_mask; + u32 quirks; +}; + +#define SYSC_QUIRK(optname, optbase, optrev, optsysc, optsyss, \ + optrev_val, optrevmask, optquirkmask) \ + { \ + .name = (optname), \ + .base = (optbase), \ + .rev_offset = (optrev), \ + .sysc_offset = (optsysc), \ + .syss_offset = (optsyss), \ + .revision = (optrev_val), \ + .revision_mask = (optrevmask), \ + .quirks = (optquirkmask), \ + } + +static const struct sysc_revision_quirk sysc_revision_quirks[] = { + /* These drivers need to be fixed to not use pm_runtime_irq_safe() */ + SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000020, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("mmu", 0, 0, 0x10, 0x14, 0x00000030, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("smartreflex", 0, -1, 0x24, -1, 0x00000000, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("smartreflex", 0, -1, 0x38, -1, 0x00000000, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("timer", 0, 0, 0x10, 0x14, 0x00000015, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), + SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff, + SYSC_QUIRK_LEGACY_IDLE), +}; + +static void sysc_init_revision_quirks(struct sysc *ddata) +{ + const struct sysc_revision_quirk *q; + int i; + + for (i = 0; i < ARRAY_SIZE(sysc_revision_quirks); i++) { + q = &sysc_revision_quirks[i]; + + if (q->base && q->base != ddata->module_pa) + continue; + + if (q->rev_offset >= 0 && + q->rev_offset != ddata->offsets[SYSC_REVISION]) + continue; + + if (q->sysc_offset >= 0 && + q->sysc_offset != ddata->offsets[SYSC_SYSCONFIG]) + continue; + + if (q->syss_offset >= 0 && + q->syss_offset != ddata->offsets[SYSC_SYSSTATUS]) + continue; + + if (q->revision == ddata->revision || + (q->revision & q->revision_mask) == + (ddata->revision & q->revision_mask)) { + ddata->name = q->name; + ddata->cfg.quirks |= q->quirks; + } + } +} + /* At this point the module is configured enough to read the revision */ static int sysc_init_module(struct sysc *ddata) { int error; + if (ddata->cfg.quirks & SYSC_QUIRK_NO_IDLE_ON_INIT) { + ddata->revision = sysc_read_revision(ddata); + goto rev_quirks; + } + error = pm_runtime_get_sync(ddata->dev); if (error < 0) { pm_runtime_put_noidle(ddata->dev); @@ -517,6 +719,9 @@ static int sysc_init_module(struct sysc *ddata) ddata->revision = sysc_read_revision(ddata); pm_runtime_put_sync(ddata->dev); +rev_quirks: + sysc_init_revision_quirks(ddata); + return 0; } @@ -605,6 +810,196 @@ static int sysc_init_syss_mask(struct sysc *ddata) return 0; } +/* + * Many child device drivers need to have fck available to get the clock + * rate for device internal configuration. + */ +static int sysc_child_add_fck(struct sysc *ddata, + struct device *child) +{ + struct clk *fck; + struct clk_lookup *l; + const char *name = clock_names[SYSC_FCK]; + + if (IS_ERR_OR_NULL(ddata->clocks[SYSC_FCK])) + return 0; + + fck = clk_get(child, name); + if (!IS_ERR(fck)) { + clk_put(fck); + + return -EEXIST; + } + + l = clkdev_create(ddata->clocks[SYSC_FCK], name, dev_name(child)); + + return l ? 0 : -ENODEV; +} + +static struct device_type sysc_device_type = { +}; + +static struct sysc *sysc_child_to_parent(struct device *dev) +{ + struct device *parent = dev->parent; + + if (!parent || parent->type != &sysc_device_type) + return NULL; + + return dev_get_drvdata(parent); +} + +static int __maybe_unused sysc_child_runtime_suspend(struct device *dev) +{ + struct sysc *ddata; + int error; + + ddata = sysc_child_to_parent(dev); + + error = pm_generic_runtime_suspend(dev); + if (error) + return error; + + if (!ddata->enabled) + return 0; + + return sysc_runtime_suspend(ddata->dev); +} + +static int __maybe_unused sysc_child_runtime_resume(struct device *dev) +{ + struct sysc *ddata; + int error; + + ddata = sysc_child_to_parent(dev); + + if (!ddata->enabled) { + error = sysc_runtime_resume(ddata->dev); + if (error < 0) + dev_err(ddata->dev, + "%s error: %i\n", __func__, error); + } + + return pm_generic_runtime_resume(dev); +} + +#ifdef CONFIG_PM_SLEEP +static int sysc_child_suspend_noirq(struct device *dev) +{ + struct sysc *ddata; + int error; + + ddata = sysc_child_to_parent(dev); + + error = pm_generic_suspend_noirq(dev); + if (error) + return error; + + if (!pm_runtime_status_suspended(dev)) { + error = pm_generic_runtime_suspend(dev); + if (error) + return error; + + error = sysc_runtime_suspend(ddata->dev); + if (error) + return error; + + ddata->child_needs_resume = true; + } + + return 0; +} + +static int sysc_child_resume_noirq(struct device *dev) +{ + struct sysc *ddata; + int error; + + ddata = sysc_child_to_parent(dev); + + if (ddata->child_needs_resume) { + ddata->child_needs_resume = false; + + error = sysc_runtime_resume(ddata->dev); + if (error) + dev_err(ddata->dev, + "%s runtime resume error: %i\n", + __func__, error); + + error = pm_generic_runtime_resume(dev); + if (error) + dev_err(ddata->dev, + "%s generic runtime resume: %i\n", + __func__, error); + } + + return pm_generic_resume_noirq(dev); +} +#endif + +struct dev_pm_domain sysc_child_pm_domain = { + .ops = { + SET_RUNTIME_PM_OPS(sysc_child_runtime_suspend, + sysc_child_runtime_resume, + NULL) + USE_PLATFORM_PM_SLEEP_OPS + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(sysc_child_suspend_noirq, + sysc_child_resume_noirq) + } +}; + +/** + * sysc_legacy_idle_quirk - handle children in omap_device compatible way + * @ddata: device driver data + * @child: child device driver + * + * Allow idle for child devices as done with _od_runtime_suspend(). + * Otherwise many child devices will not idle because of the permanent + * parent usecount set in pm_runtime_irq_safe(). + * + * Note that the long term solution is to just modify the child device + * drivers to not set pm_runtime_irq_safe() and then this can be just + * dropped. + */ +static void sysc_legacy_idle_quirk(struct sysc *ddata, struct device *child) +{ + if (!ddata->legacy_mode) + return; + + if (ddata->cfg.quirks & SYSC_QUIRK_LEGACY_IDLE) + dev_pm_domain_set(child, &sysc_child_pm_domain); +} + +static int sysc_notifier_call(struct notifier_block *nb, + unsigned long event, void *device) +{ + struct device *dev = device; + struct sysc *ddata; + int error; + + ddata = sysc_child_to_parent(dev); + if (!ddata) + return NOTIFY_DONE; + + switch (event) { + case BUS_NOTIFY_ADD_DEVICE: + error = sysc_child_add_fck(ddata, dev); + if (error && error != -EEXIST) + dev_warn(ddata->dev, "could not add %s fck: %i\n", + dev_name(dev), error); + sysc_legacy_idle_quirk(ddata, dev); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +static struct notifier_block sysc_nb = { + .notifier_call = sysc_notifier_call, +}; + /* Device tree configured quirks */ struct sysc_dts_quirk { const char *name; @@ -797,7 +1192,8 @@ static const struct sysc_capabilities sysc_34xx_sr = { .type = TI_SYSC_OMAP34XX_SR, .sysc_mask = SYSC_OMAP2_CLOCKACTIVITY, .regbits = &sysc_regbits_omap34xx_sr, - .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED, + .mod_quirks = SYSC_QUIRK_USE_CLOCKACT | SYSC_QUIRK_UNCACHED | + SYSC_QUIRK_LEGACY_IDLE, }; /* @@ -818,12 +1214,13 @@ static const struct sysc_capabilities sysc_36xx_sr = { .type = TI_SYSC_OMAP36XX_SR, .sysc_mask = SYSC_OMAP3_SR_ENAWAKEUP, .regbits = &sysc_regbits_omap36xx_sr, - .mod_quirks = SYSC_QUIRK_UNCACHED, + .mod_quirks = SYSC_QUIRK_UNCACHED | SYSC_QUIRK_LEGACY_IDLE, }; static const struct sysc_capabilities sysc_omap4_sr = { .type = TI_SYSC_OMAP4_SR, .regbits = &sysc_regbits_omap36xx_sr, + .mod_quirks = SYSC_QUIRK_LEGACY_IDLE, }; /* @@ -865,6 +1262,33 @@ static const struct sysc_capabilities sysc_omap4_usb_host_fs = { .regbits = &sysc_regbits_omap4_usb_host_fs, }; +static int sysc_init_pdata(struct sysc *ddata) +{ + struct ti_sysc_platform_data *pdata = dev_get_platdata(ddata->dev); + struct ti_sysc_module_data mdata; + int error = 0; + + if (!pdata || !ddata->legacy_mode) + return 0; + + mdata.name = ddata->legacy_mode; + mdata.module_pa = ddata->module_pa; + mdata.module_size = ddata->module_size; + mdata.offsets = ddata->offsets; + mdata.nr_offsets = SYSC_MAX_REGS; + mdata.cap = ddata->cap; + mdata.cfg = &ddata->cfg; + + if (!pdata->init_module) + return -ENODEV; + + error = pdata->init_module(ddata->dev, &mdata, &ddata->cookie); + if (error == -EEXIST) + error = 0; + + return error; +} + static int sysc_init_match(struct sysc *ddata) { const struct sysc_capabilities *cap; @@ -880,8 +1304,19 @@ static int sysc_init_match(struct sysc *ddata) return 0; } +static void ti_sysc_idle(struct work_struct *work) +{ + struct sysc *ddata; + + ddata = container_of(work, struct sysc, idle_work.work); + + if (pm_runtime_active(ddata->dev)) + pm_runtime_put_sync(ddata->dev); +} + static int sysc_probe(struct platform_device *pdev) { + struct ti_sysc_platform_data *pdata = dev_get_platdata(&pdev->dev); struct sysc *ddata; int error; @@ -920,6 +1355,10 @@ static int sysc_probe(struct platform_device *pdev) if (error) goto unprepare; + error = sysc_init_pdata(ddata); + if (error) + goto unprepare; + pm_runtime_enable(ddata->dev); error = sysc_init_module(ddata); @@ -933,22 +1372,28 @@ static int sysc_probe(struct platform_device *pdev) goto unprepare; } - pm_runtime_use_autosuspend(ddata->dev); - sysc_show_registers(ddata); + ddata->dev->type = &sysc_device_type; error = of_platform_populate(ddata->dev->of_node, - NULL, NULL, ddata->dev); + NULL, pdata ? pdata->auxdata : NULL, + ddata->dev); if (error) goto err; - pm_runtime_mark_last_busy(ddata->dev); - pm_runtime_put_autosuspend(ddata->dev); + INIT_DELAYED_WORK(&ddata->idle_work, ti_sysc_idle); + + /* At least earlycon won't survive without deferred idle */ + if (ddata->cfg.quirks & (SYSC_QUIRK_NO_IDLE_ON_INIT | + SYSC_QUIRK_NO_RESET_ON_INIT)) { + schedule_delayed_work(&ddata->idle_work, 3000); + } else { + pm_runtime_put(&pdev->dev); + } return 0; err: - pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); unprepare: @@ -962,6 +1407,8 @@ static int sysc_remove(struct platform_device *pdev) struct sysc *ddata = platform_get_drvdata(pdev); int error; + cancel_delayed_work_sync(&ddata->idle_work); + error = pm_runtime_get_sync(ddata->dev); if (error < 0) { pm_runtime_put_noidle(ddata->dev); @@ -971,7 +1418,6 @@ static int sysc_remove(struct platform_device *pdev) of_platform_depopulate(&pdev->dev); - pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); @@ -1008,7 +1454,21 @@ static struct platform_driver sysc_driver = { .pm = &sysc_pm_ops, }, }; -module_platform_driver(sysc_driver); + +static int __init sysc_init(void) +{ + bus_register_notifier(&platform_bus_type, &sysc_nb); + + return platform_driver_register(&sysc_driver); +} +module_init(sysc_init); + +static void __exit sysc_exit(void) +{ + bus_unregister_notifier(&platform_bus_type, &sysc_nb); + platform_driver_unregister(&sysc_driver); +} +module_exit(sysc_exit); MODULE_DESCRIPTION("TI sysc interconnect target driver"); MODULE_LICENSE("GPL v2"); |