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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-03 17:00:52 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-03 17:00:52 -0700
commitd461e96cd22b5aeb1df448536b92e8d8e88c4a05 (patch)
treeffd7a4ddc858c79a9a30952bedf14652ac10a2e4 /drivers/bus/ti-sysc.c
parentae45d84fc36d01dcb1007f4298871eec37907904 (diff)
parent6a03568932b2711c91e1572f08867690b52a18df (diff)
downloadlinux-d461e96cd22b5aeb1df448536b92e8d8e88c4a05.tar.bz2
Merge tag 'drivers-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC driver updates from Arnd Bergmann: "These are all the driver updates for SoC specific drivers. There are a couple of subsystems with individual maintainers picking up their patches here: - The reset controller subsystem add support for a few new SoC variants to existing drivers, along with other minor improvements - The OP-TEE subsystem gets a driver for the ARM FF-A transport - The memory controller subsystem has improvements for Tegra, Mediatek, Renesas, Freescale and Broadcom specific drivers. - The tegra cpuidle driver changes get merged through this tree this time. There are only minor changes, but they depend on other tegra driver updates here. - The ep93xx platform finally moves to using the drivers/clk/ subsystem, moving the code out of arch/arm in the process. This depends on a small sound driver change that is included here as well. - There are some minor updates for Qualcomm and Tegra specific firmware drivers. The other driver updates are mainly for drivers/soc, which contains a mixture of vendor specific drivers that don't really fit elsewhere: - Mediatek drivers gain more support for MT8192, with new support for hw-mutex and mmsys routing, plus support for reset lines in the mmsys driver. - Qualcomm gains a new "sleep stats" driver, and support for the "Generic Packet Router" in the APR driver. - There is a new user interface for routing the UARTS on ASpeed BMCs, something that apparently nobody else has needed so far. - More drivers can now be built as loadable modules, in particular for Broadcom and Samsung platforms. - Lots of improvements to the TI sysc driver for better suspend/resume support" Finally, there are lots of minor cleanups and new device IDs for amlogic, renesas, tegra, qualcomm, mediateka, samsung, imx, layerscape, allwinner, broadcom, and omap" * tag 'drivers-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (179 commits) optee: Fix spelling mistake "reclain" -> "reclaim" Revert "firmware: qcom: scm: Add support for MC boot address API" qcom: spm: allow compile-testing firmware: arm_ffa: Remove unused 'compat_version' variable soc: samsung: exynos-chipid: add exynosautov9 SoC support firmware: qcom: scm: Don't break compile test on non-ARM platforms soc: qcom: smp2p: Add of_node_put() before goto soc: qcom: apr: Add of_node_put() before return soc: qcom: qcom_stats: Fix client votes offset soc: qcom: rpmhpd: fix sm8350_mxc's peer domain dt-bindings: arm: cpus: Document qcom,msm8916-smp enable-method ARM: qcom: Add qcom,msm8916-smp enable-method identical to MSM8226 firmware: qcom: scm: Add support for MC boot address API soc: qcom: spm: Add 8916 SPM register data dt-bindings: soc: qcom: spm: Document qcom,msm8916-saw2-v3.0-cpu soc: qcom: socinfo: Add PM8150C and SMB2351 models firmware: qcom_scm: Fix error retval in __qcom_scm_is_call_available() soc: aspeed: Add UART routing support soc: fsl: dpio: rename the enqueue descriptor variable soc: fsl: dpio: use an explicit NULL instead of 0 ...
Diffstat (limited to 'drivers/bus/ti-sysc.c')
-rw-r--r--drivers/bus/ti-sysc.c276
1 files changed, 241 insertions, 35 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 6a8b7fb5be58..54c0ee6dda30 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -6,6 +6,7 @@
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
+#include <linux/cpu_pm.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/module.h>
@@ -17,6 +18,7 @@
#include <linux/of_platform.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
+#include <linux/timekeeping.h>
#include <linux/iopoll.h>
#include <linux/platform_data/ti-sysc.h>
@@ -51,11 +53,18 @@ struct sysc_address {
struct list_head node;
};
+struct sysc_module {
+ struct sysc *ddata;
+ struct list_head node;
+};
+
struct sysc_soc_info {
unsigned long general_purpose:1;
enum sysc_soc soc;
- struct mutex list_lock; /* disabled modules list lock */
+ struct mutex list_lock; /* disabled and restored modules list lock */
struct list_head disabled_modules;
+ struct list_head restored_modules;
+ struct notifier_block nb;
};
enum sysc_clocks {
@@ -131,6 +140,7 @@ struct sysc {
struct ti_sysc_cookie cookie;
const char *name;
u32 revision;
+ u32 sysconfig;
unsigned int reserved:1;
unsigned int enabled:1;
unsigned int needs_resume:1;
@@ -147,6 +157,7 @@ struct sysc {
static void sysc_parse_dts_quirks(struct sysc *ddata, struct device_node *np,
bool is_child);
+static int sysc_reset(struct sysc *ddata);
static void sysc_write(struct sysc *ddata, int offset, u32 value)
{
@@ -223,37 +234,77 @@ static u32 sysc_read_sysstatus(struct sysc *ddata)
return sysc_read(ddata, offset);
}
-/* Poll on reset status */
-static int sysc_wait_softreset(struct sysc *ddata)
+static int sysc_poll_reset_sysstatus(struct sysc *ddata)
{
- u32 sysc_mask, syss_done, rstval;
- int syss_offset, error = 0;
-
- if (ddata->cap->regbits->srst_shift < 0)
- return 0;
-
- syss_offset = ddata->offsets[SYSC_SYSSTATUS];
- sysc_mask = BIT(ddata->cap->regbits->srst_shift);
+ int error, retries;
+ u32 syss_done, rstval;
if (ddata->cfg.quirks & SYSS_QUIRK_RESETDONE_INVERTED)
syss_done = 0;
else
syss_done = ddata->cfg.syss_mask;
- if (syss_offset >= 0) {
+ if (likely(!timekeeping_suspended)) {
error = readx_poll_timeout_atomic(sysc_read_sysstatus, ddata,
rstval, (rstval & ddata->cfg.syss_mask) ==
syss_done, 100, MAX_MODULE_SOFTRESET_WAIT);
+ } else {
+ retries = MAX_MODULE_SOFTRESET_WAIT;
+ while (retries--) {
+ rstval = sysc_read_sysstatus(ddata);
+ if ((rstval & ddata->cfg.syss_mask) == syss_done)
+ return 0;
+ udelay(2); /* Account for udelay flakeyness */
+ }
+ error = -ETIMEDOUT;
+ }
+
+ return error;
+}
+
+static int sysc_poll_reset_sysconfig(struct sysc *ddata)
+{
+ int error, retries;
+ u32 sysc_mask, rstval;
+
+ sysc_mask = BIT(ddata->cap->regbits->srst_shift);
- } else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS) {
+ if (likely(!timekeeping_suspended)) {
error = readx_poll_timeout_atomic(sysc_read_sysconfig, ddata,
rstval, !(rstval & sysc_mask),
100, MAX_MODULE_SOFTRESET_WAIT);
+ } else {
+ retries = MAX_MODULE_SOFTRESET_WAIT;
+ while (retries--) {
+ rstval = sysc_read_sysconfig(ddata);
+ if (!(rstval & sysc_mask))
+ return 0;
+ udelay(2); /* Account for udelay flakeyness */
+ }
+ error = -ETIMEDOUT;
}
return error;
}
+/* Poll on reset status */
+static int sysc_wait_softreset(struct sysc *ddata)
+{
+ int syss_offset, error = 0;
+
+ if (ddata->cap->regbits->srst_shift < 0)
+ return 0;
+
+ syss_offset = ddata->offsets[SYSC_SYSSTATUS];
+
+ if (syss_offset >= 0)
+ error = sysc_poll_reset_sysstatus(ddata);
+ else if (ddata->cfg.quirks & SYSC_QUIRK_RESET_STATUS)
+ error = sysc_poll_reset_sysconfig(ddata);
+
+ return error;
+}
+
static int sysc_add_named_clock_from_child(struct sysc *ddata,
const char *name,
const char *optfck_name)
@@ -1094,7 +1145,8 @@ set_midle:
best_mode = fls(ddata->cfg.midlemodes) - 1;
if (best_mode > SYSC_IDLE_MASK) {
dev_err(dev, "%s: invalid midlemode\n", __func__);
- return -EINVAL;
+ error = -EINVAL;
+ goto save_context;
}
if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_MSTANDBY)
@@ -1112,13 +1164,16 @@ set_autoidle:
sysc_write_sysconfig(ddata, reg);
}
- /* Flush posted write */
- sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+ error = 0;
+
+save_context:
+ /* Save context and flush posted write */
+ ddata->sysconfig = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
if (ddata->module_enable_quirk)
ddata->module_enable_quirk(ddata);
- return 0;
+ return error;
}
static int sysc_best_idle_mode(u32 idlemodes, u32 *best_mode)
@@ -1175,8 +1230,10 @@ static int sysc_disable_module(struct device *dev)
set_sidle:
/* Set SIDLE mode */
idlemodes = ddata->cfg.sidlemodes;
- if (!idlemodes || regbits->sidle_shift < 0)
- return 0;
+ if (!idlemodes || regbits->sidle_shift < 0) {
+ ret = 0;
+ goto save_context;
+ }
if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) {
best_mode = SYSC_IDLE_FORCE;
@@ -1184,7 +1241,8 @@ set_sidle:
ret = sysc_best_idle_mode(idlemodes, &best_mode);
if (ret) {
dev_err(dev, "%s: invalid sidlemode\n", __func__);
- return ret;
+ ret = -EINVAL;
+ goto save_context;
}
}
@@ -1195,10 +1253,13 @@ set_sidle:
reg |= 1 << regbits->autoidle_shift;
sysc_write_sysconfig(ddata, reg);
- /* Flush posted write */
- sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+ ret = 0;
- return 0;
+save_context:
+ /* Save context and flush posted write */
+ ddata->sysconfig = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+
+ return ret;
}
static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev,
@@ -1336,13 +1397,40 @@ err_allow_idle:
return error;
}
+/*
+ * Checks if device context was lost. Assumes the sysconfig register value
+ * after lost context is different from the configured value. Only works for
+ * enabled devices.
+ *
+ * Eventually we may want to also add support to using the context lost
+ * registers that some SoCs have.
+ */
+static int sysc_check_context(struct sysc *ddata)
+{
+ u32 reg;
+
+ if (!ddata->enabled)
+ return -ENODATA;
+
+ reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+ if (reg == ddata->sysconfig)
+ return 0;
+
+ return -EACCES;
+}
+
static int sysc_reinit_module(struct sysc *ddata, bool leave_enabled)
{
struct device *dev = ddata->dev;
int error;
- /* Disable target module if it is enabled */
if (ddata->enabled) {
+ /* Nothing to do if enabled and context not lost */
+ error = sysc_check_context(ddata);
+ if (!error)
+ return 0;
+
+ /* Disable target module if it is enabled */
error = sysc_runtime_suspend(dev);
if (error)
dev_warn(dev, "reinit suspend failed: %i\n", error);
@@ -1353,6 +1441,15 @@ static int sysc_reinit_module(struct sysc *ddata, bool leave_enabled)
if (error)
dev_warn(dev, "reinit resume failed: %i\n", error);
+ /* Some modules like am335x gpmc need reset and restore of sysconfig */
+ if (ddata->cfg.quirks & SYSC_QUIRK_RESET_ON_CTX_LOST) {
+ error = sysc_reset(ddata);
+ if (error)
+ dev_warn(dev, "reinit reset failed: %i\n", error);
+
+ sysc_write_sysconfig(ddata, ddata->sysconfig);
+ }
+
if (leave_enabled)
return error;
@@ -1442,10 +1539,6 @@ struct sysc_revision_quirk {
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, 0xffff00ff,
- SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_OPT_CLKS_IN_RESET),
- SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
- SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
@@ -1479,7 +1572,10 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
SYSC_QUIRK_CLKDM_NOAUTO),
SYSC_QUIRK("dwc3", 0x488c0000, 0, 0x10, -ENODEV, 0x500a0200, 0xffffffff,
SYSC_QUIRK_CLKDM_NOAUTO),
+ SYSC_QUIRK("gpio", 0, 0, 0x10, 0x114, 0x50600801, 0xffff00ff,
+ SYSC_QUIRK_OPT_CLKS_IN_RESET),
SYSC_QUIRK("gpmc", 0, 0, 0x10, 0x14, 0x00000060, 0xffffffff,
+ SYSC_QUIRK_REINIT_ON_CTX_LOST | SYSC_QUIRK_RESET_ON_CTX_LOST |
SYSC_QUIRK_GPMC_DEBUG),
SYSC_QUIRK("hdmi", 0, 0, 0x10, -ENODEV, 0x50030200, 0xffffffff,
SYSC_QUIRK_OPT_CLKS_NEEDED),
@@ -1515,10 +1611,11 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
SYSC_QUIRK("usb_host_hs", 0, 0, 0x10, -ENODEV, 0x50700101, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
SYSC_QUIRK("usb_otg_hs", 0, 0x400, 0x404, 0x408, 0x00000050,
- 0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY),
+ 0xffffffff, SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
+ SYSC_MODULE_QUIRK_OTG),
SYSC_QUIRK("usb_otg_hs", 0, 0, 0x10, -ENODEV, 0x4ea2080d, 0xffffffff,
SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_SWSUP_MSTANDBY |
- SYSC_QUIRK_REINIT_ON_RESUME),
+ SYSC_QUIRK_REINIT_ON_CTX_LOST),
SYSC_QUIRK("wdt", 0, 0, 0x10, 0x14, 0x502a0500, 0xfffff0f0,
SYSC_MODULE_QUIRK_WDT),
/* PRUSS on am3, am4 and am5 */
@@ -1583,6 +1680,7 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
SYSC_QUIRK("sdio", 0, 0, 0x10, -ENODEV, 0x40202301, 0xffff0ff0, 0),
SYSC_QUIRK("sdio", 0, 0x2fc, 0x110, 0x114, 0x31010000, 0xffffffff, 0),
SYSC_QUIRK("sdma", 0, 0, 0x2c, 0x28, 0x00010900, 0xffffffff, 0),
+ SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff, 0),
SYSC_QUIRK("slimbus", 0, 0, 0x10, -ENODEV, 0x40000902, 0xffffffff, 0),
SYSC_QUIRK("slimbus", 0, 0, 0x10, -ENODEV, 0x40002903, 0xffffffff, 0),
SYSC_QUIRK("smartreflex", 0, -ENODEV, 0x24, -ENODEV, 0x00000000, 0xffffffff, 0),
@@ -1874,6 +1972,22 @@ static void sysc_module_lock_quirk_rtc(struct sysc *ddata)
sysc_quirk_rtc(ddata, true);
}
+/* OTG omap2430 glue layer up to omap4 needs OTG_FORCESTDBY configured */
+static void sysc_module_enable_quirk_otg(struct sysc *ddata)
+{
+ int offset = 0x414; /* OTG_FORCESTDBY */
+
+ sysc_write(ddata, offset, 0);
+}
+
+static void sysc_module_disable_quirk_otg(struct sysc *ddata)
+{
+ int offset = 0x414; /* OTG_FORCESTDBY */
+ u32 val = BIT(0); /* ENABLEFORCE */
+
+ sysc_write(ddata, offset, val);
+}
+
/* 36xx SGX needs a quirk for to bypass OCP IPG interrupt logic */
static void sysc_module_enable_quirk_sgx(struct sysc *ddata)
{
@@ -1956,6 +2070,11 @@ static void sysc_init_module_quirks(struct sysc *ddata)
return;
}
+ if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_OTG) {
+ ddata->module_enable_quirk = sysc_module_enable_quirk_otg;
+ ddata->module_disable_quirk = sysc_module_disable_quirk_otg;
+ }
+
if (ddata->cfg.quirks & SYSC_MODULE_QUIRK_SGX)
ddata->module_enable_quirk = sysc_module_enable_quirk_sgx;
@@ -2401,6 +2520,78 @@ static struct dev_pm_domain sysc_child_pm_domain = {
}
};
+/* Caller needs to take list_lock if ever used outside of cpu_pm */
+static void sysc_reinit_modules(struct sysc_soc_info *soc)
+{
+ struct sysc_module *module;
+ struct list_head *pos;
+ struct sysc *ddata;
+
+ list_for_each(pos, &sysc_soc->restored_modules) {
+ module = list_entry(pos, struct sysc_module, node);
+ ddata = module->ddata;
+ sysc_reinit_module(ddata, ddata->enabled);
+ }
+}
+
+/**
+ * sysc_context_notifier - optionally reset and restore module after idle
+ * @nb: notifier block
+ * @cmd: unused
+ * @v: unused
+ *
+ * Some interconnect target modules need to be restored, or reset and restored
+ * on CPU_PM CPU_PM_CLUSTER_EXIT notifier. This is needed at least for am335x
+ * OTG and GPMC target modules even if the modules are unused.
+ */
+static int sysc_context_notifier(struct notifier_block *nb, unsigned long cmd,
+ void *v)
+{
+ struct sysc_soc_info *soc;
+
+ soc = container_of(nb, struct sysc_soc_info, nb);
+
+ switch (cmd) {
+ case CPU_CLUSTER_PM_ENTER:
+ break;
+ case CPU_CLUSTER_PM_ENTER_FAILED: /* No need to restore context */
+ break;
+ case CPU_CLUSTER_PM_EXIT:
+ sysc_reinit_modules(soc);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+/**
+ * sysc_add_restored - optionally add reset and restore quirk hanlling
+ * @ddata: device data
+ */
+static void sysc_add_restored(struct sysc *ddata)
+{
+ struct sysc_module *restored_module;
+
+ restored_module = kzalloc(sizeof(*restored_module), GFP_KERNEL);
+ if (!restored_module)
+ return;
+
+ restored_module->ddata = ddata;
+
+ mutex_lock(&sysc_soc->list_lock);
+
+ list_add(&restored_module->node, &sysc_soc->restored_modules);
+
+ if (sysc_soc->nb.notifier_call)
+ goto out_unlock;
+
+ sysc_soc->nb.notifier_call = sysc_context_notifier;
+ cpu_pm_register_notifier(&sysc_soc->nb);
+
+out_unlock:
+ mutex_unlock(&sysc_soc->list_lock);
+}
+
/**
* sysc_legacy_idle_quirk - handle children in omap_device compatible way
* @ddata: device driver data
@@ -2900,12 +3091,14 @@ static int sysc_add_disabled(unsigned long base)
}
/*
- * One time init to detect the booted SoC and disable unavailable features.
+ * One time init to detect the booted SoC, disable unavailable features
+ * and initialize list for optional cpu_pm notifier.
+ *
* Note that we initialize static data shared across all ti-sysc instances
* so ddata is only used for SoC type. This can be called from module_init
* once we no longer need to rely on platform data.
*/
-static int sysc_init_soc(struct sysc *ddata)
+static int sysc_init_static_data(struct sysc *ddata)
{
const struct soc_device_attribute *match;
struct ti_sysc_platform_data *pdata;
@@ -2921,6 +3114,7 @@ static int sysc_init_soc(struct sysc *ddata)
mutex_init(&sysc_soc->list_lock);
INIT_LIST_HEAD(&sysc_soc->disabled_modules);
+ INIT_LIST_HEAD(&sysc_soc->restored_modules);
sysc_soc->general_purpose = true;
pdata = dev_get_platdata(ddata->dev);
@@ -2985,15 +3179,24 @@ static int sysc_init_soc(struct sysc *ddata)
return 0;
}
-static void sysc_cleanup_soc(void)
+static void sysc_cleanup_static_data(void)
{
+ struct sysc_module *restored_module;
struct sysc_address *disabled_module;
struct list_head *pos, *tmp;
if (!sysc_soc)
return;
+ if (sysc_soc->nb.notifier_call)
+ cpu_pm_unregister_notifier(&sysc_soc->nb);
+
mutex_lock(&sysc_soc->list_lock);
+ list_for_each_safe(pos, tmp, &sysc_soc->restored_modules) {
+ restored_module = list_entry(pos, struct sysc_module, node);
+ list_del(pos);
+ kfree(restored_module);
+ }
list_for_each_safe(pos, tmp, &sysc_soc->disabled_modules) {
disabled_module = list_entry(pos, struct sysc_address, node);
list_del(pos);
@@ -3061,7 +3264,7 @@ static int sysc_probe(struct platform_device *pdev)
ddata->dev = &pdev->dev;
platform_set_drvdata(pdev, ddata);
- error = sysc_init_soc(ddata);
+ error = sysc_init_static_data(ddata);
if (error)
return error;
@@ -3159,6 +3362,9 @@ static int sysc_probe(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
}
+ if (ddata->cfg.quirks & SYSC_QUIRK_REINIT_ON_CTX_LOST)
+ sysc_add_restored(ddata);
+
return 0;
err:
@@ -3240,7 +3446,7 @@ static void __exit sysc_exit(void)
{
bus_unregister_notifier(&platform_bus_type, &sysc_nb);
platform_driver_unregister(&sysc_driver);
- sysc_cleanup_soc();
+ sysc_cleanup_static_data();
}
module_exit(sysc_exit);