Messages in this thread | | | Subject | Re: [PATCHv3 11/15] remoteproc/omap: Request a timer(s) for remoteproc usage | From | Tero Kristo <> | Date | Thu, 19 Dec 2019 15:43:12 +0200 |
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On 19/12/2019 00:43, Mathieu Poirier wrote: > On Fri, Dec 13, 2019 at 02:55:33PM +0200, Tero Kristo wrote: >> From: Suman Anna <s-anna@ti.com> >> >> The remote processors in OMAP4+ SoCs are equipped with internal >> timers, like the internal SysTick timer in a Cortex M3/M4 NVIC or >> the CTM timer within Unicache in IPU & DSP. However, these timers >> are gated when the processor subsystem clock is gated, making >> them rather difficult to use as OS tick sources. They will not >> be able to wakeup the processor from any processor-sleep induced >> clock-gating states. >> >> This can be avoided by using an external timer as the tick source, >> which can be controlled independently by the OMAP remoteproc >> driver code, but still allowing the processor subsystem clock to >> be auto-gated when the remoteproc cores are idle. >> >> This patch adds the support for OMAP remote processors to request >> timer(s) to be used by the remoteproc. The timers are enabled and >> disabled in line with the enabling/disabling of the remoteproc. >> The timer data is not mandatory if the advanced device management >> features are not required. >> >> The core timer functionality is provided by the OMAP DMTimer >> clocksource driver, which does not export any API. The logic is >> implemented through the timer device's platform data ops. The OMAP >> remoteproc driver mainly requires ops to request/free a dmtimer, >> and to start/stop a timer. The split ops helps in controlling the >> timer state without having to request and release a timer everytime >> it needs to use the timer. >> >> NOTE: If the gptimer is already in use by the time IPU and/or >> DSP are loaded, the processors will fail to boot. >> >> Signed-off-by: Suman Anna <s-anna@ti.com> >> Signed-off-by: Tero Kristo <t-kristo@ti.com> >> --- >> drivers/remoteproc/omap_remoteproc.c | 258 +++++++++++++++++++++++++++ >> 1 file changed, 258 insertions(+) >> >> diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c >> index 841981c50d8d..9c750c2ab29d 100644 >> --- a/drivers/remoteproc/omap_remoteproc.c >> +++ b/drivers/remoteproc/omap_remoteproc.c >> @@ -26,6 +26,9 @@ >> #include <linux/regmap.h> >> #include <linux/mfd/syscon.h> >> #include <linux/reset.h> >> +#include <clocksource/timer-ti-dm.h> >> + >> +#include <linux/platform_data/dmtimer-omap.h> >> >> #include "omap_remoteproc.h" >> #include "remoteproc_internal.h" >> @@ -57,6 +60,16 @@ struct omap_rproc_mem { >> size_t size; >> }; >> >> +/** >> + * struct omap_rproc_timer - data structure for a timer used by a omap rproc >> + * @odt: timer pointer >> + * @timer_ops: OMAP dmtimer ops for @odt timer >> + */ >> +struct omap_rproc_timer { >> + struct omap_dm_timer *odt; >> + const struct omap_dm_timer_ops *timer_ops; >> +}; >> + >> /** >> * struct omap_rproc - omap remote processor state >> * @mbox: mailbox channel handle >> @@ -64,6 +77,8 @@ struct omap_rproc_mem { >> * @boot_data: boot data structure for setting processor boot address >> * @mem: internal memory regions data >> * @num_mems: number of internal memory regions >> + * @num_timers: number of rproc timer(s) >> + * @timers: timer(s) info used by rproc >> * @rproc: rproc handle >> * @reset: reset handle >> */ >> @@ -73,6 +88,8 @@ struct omap_rproc { >> struct omap_rproc_boot_data *boot_data; >> struct omap_rproc_mem *mem; >> int num_mems; >> + int num_timers; >> + struct omap_rproc_timer *timers; >> struct rproc *rproc; >> struct reset_control *reset; >> }; >> @@ -93,6 +110,213 @@ struct omap_rproc_dev_data { >> const u32 *dev_addrs; >> }; >> >> +/** >> + * omap_rproc_request_timer() - request a timer for a remoteproc >> + * @dev: device requesting the timer >> + * @np: device node pointer to the desired timer >> + * @timer: handle to a struct omap_rproc_timer to return the timer handle >> + * >> + * This helper function is used primarily to request a timer associated with >> + * a remoteproc. The returned handle is stored in the .odt field of the >> + * @timer structure passed in, and is used to invoke other timer specific >> + * ops (like starting a timer either during device initialization or during >> + * a resume operation, or for stopping/freeing a timer). >> + * >> + * Returns 0 on success, otherwise an appropriate failure >> + */ >> +static int omap_rproc_request_timer(struct device *dev, struct device_node *np, >> + struct omap_rproc_timer *timer) >> +{ >> + int ret; >> + >> + timer->odt = timer->timer_ops->request_by_node(np); >> + if (!timer->odt) { >> + dev_err(dev, "request for timer node %p failed\n", np); >> + return -EBUSY; >> + } >> + >> + ret = timer->timer_ops->set_source(timer->odt, OMAP_TIMER_SRC_SYS_CLK); >> + if (ret) { >> + dev_err(dev, "error setting OMAP_TIMER_SRC_SYS_CLK as source for timer node %p\n", >> + np); >> + timer->timer_ops->free(timer->odt); >> + return ret; >> + } >> + >> + /* clean counter, remoteproc code will set the value */ >> + timer->timer_ops->set_load(timer->odt, 0, 0); >> + >> + return 0; >> +} >> + >> +/** >> + * omap_rproc_start_timer - start a timer for a remoteproc >> + * @timer: handle to a OMAP rproc timer >> + * >> + * This helper function is used to start a timer associated with a remoteproc, >> + * obtained using the request_timer ops. The helper function needs to be >> + * invoked by the driver to start the timer (during device initialization) >> + * or to just resume the timer. >> + * >> + * Returns 0 on success, otherwise a failure as returned by DMTimer ops >> + */ >> +static inline int omap_rproc_start_timer(struct omap_rproc_timer *timer) >> +{ >> + return timer->timer_ops->start(timer->odt); >> +} >> + >> +/** >> + * omap_rproc_stop_timer - stop a timer for a remoteproc >> + * @timer: handle to a OMAP rproc timer >> + * >> + * This helper function is used to disable a timer associated with a >> + * remoteproc, and needs to be called either during a device shutdown >> + * or suspend operation. The separate helper function allows the driver >> + * to just stop a timer without having to release the timer during a >> + * suspend operation. >> + * >> + * Returns 0 on success, otherwise a failure as returned by DMTimer ops >> + */ >> +static inline int omap_rproc_stop_timer(struct omap_rproc_timer *timer) >> +{ >> + return timer->timer_ops->stop(timer->odt); >> +} >> + >> +/** >> + * omap_rproc_release_timer - release a timer for a remoteproc >> + * @timer: handle to a OMAP rproc timer >> + * >> + * This helper function is used primarily to release a timer associated >> + * with a remoteproc. The dmtimer will be available for other clients to >> + * use once released. >> + * >> + * Returns 0 on success, otherwise a failure as returned by DMTimer ops >> + */ >> +static inline int omap_rproc_release_timer(struct omap_rproc_timer *timer) >> +{ >> + return timer->timer_ops->free(timer->odt); >> +} >> + >> +/** >> + * omap_rproc_enable_timers - enable the timers for a remoteproc >> + * @rproc: handle of a remote processor >> + * @configure: boolean flag used to acquire and configure the timer handle >> + * >> + * This function is used primarily to enable the timers associated with >> + * a remoteproc. The configure flag is provided to allow the driver to >> + * to either acquire and start a timer (during device initialization) or >> + * to just start a timer (during a resume operation). >> + */ >> +static int omap_rproc_enable_timers(struct rproc *rproc, bool configure) >> +{ >> + int i; >> + int ret = 0; >> + struct platform_device *tpdev; >> + struct dmtimer_platform_data *tpdata; >> + const struct omap_dm_timer_ops *timer_ops; >> + struct omap_rproc *oproc = rproc->priv; >> + struct omap_rproc_timer *timers = oproc->timers; >> + struct device *dev = rproc->dev.parent; >> + struct device_node *np = NULL; >> + >> + if (oproc->num_timers <= 0) >> + return 0; > > Given the code in omap_rproc_probe() ->num_timers can only be >= 0.
Will fix to check against 0 only.
> >> + >> + if (!configure) >> + goto start_timers; >> + >> + for (i = 0; i < oproc->num_timers; i++) { >> + np = of_parse_phandle(dev->of_node, "ti,timers", i); >> + if (!np) { >> + ret = -ENXIO; >> + dev_err(dev, "device node lookup for timer at index %d failed: %d\n", >> + i, ret); >> + goto free_timers; >> + } >> + >> + tpdev = of_find_device_by_node(np); >> + if (!tpdev) { >> + ret = -ENODEV; >> + dev_err(dev, "could not get timer platform device\n"); >> + goto put_node; >> + } >> + >> + tpdata = dev_get_platdata(&tpdev->dev); >> + put_device(&tpdev->dev); >> + if (!tpdata) { >> + ret = -EINVAL; >> + dev_err(dev, "dmtimer pdata structure NULL\n"); >> + goto put_node; >> + } >> + >> + timer_ops = tpdata->timer_ops; >> + if (!timer_ops || !timer_ops->request_by_node || >> + !timer_ops->set_source || !timer_ops->set_load || >> + !timer_ops->free || !timer_ops->start || >> + !timer_ops->stop) { >> + ret = -EINVAL; >> + dev_err(dev, "device does not have required timer ops\n"); >> + goto put_node; >> + } >> + >> + timers[i].timer_ops = timer_ops; >> + ret = omap_rproc_request_timer(dev, np, &timers[i]); >> + if (ret) { >> + dev_err(dev, "request for timer %p failed: %d\n", np, >> + ret); >> + goto put_node; >> + } >> + of_node_put(np); >> + } >> + >> +start_timers: >> + for (i = 0; i < oproc->num_timers; i++) >> + omap_rproc_start_timer(&timers[i]); > > The return code for omap_rproc_start_timer() is ignored. If this is intentional > then adding a comment to justify the choice is probably a good idea. Otherwise > please consider refactoring.
Will add a cleanup loop to clear this in failure.
> >> + return 0; >> + >> +put_node: >> + of_node_put(np); >> +free_timers: >> + while (i--) { >> + omap_rproc_release_timer(&timers[i]); >> + timers[i].odt = NULL; >> + timers[i].timer_ops = NULL; >> + } >> + >> + return ret; >> +} >> + >> +/** >> + * omap_rproc_disable_timers - disable the timers for a remoteproc >> + * @rproc: handle of a remote processor >> + * @configure: boolean flag used to release the timer handle >> + * >> + * This function is used primarily to disable the timers associated with >> + * a remoteproc. The configure flag is provided to allow the driver to >> + * to either stop and release a timer (during device shutdown) or to just >> + * stop a timer (during a suspend operation). >> + */ >> +static int omap_rproc_disable_timers(struct rproc *rproc, bool configure) >> +{ >> + int i; >> + struct omap_rproc *oproc = rproc->priv; >> + struct omap_rproc_timer *timers = oproc->timers; >> + >> + if (oproc->num_timers <= 0) > > Same comment as above.
Will fix to check against 0 only.
> >> + return 0; >> + >> + for (i = 0; i < oproc->num_timers; i++) { >> + omap_rproc_stop_timer(&timers[i]); >> + if (configure) { >> + omap_rproc_release_timer(&timers[i]); >> + timers[i].odt = NULL; >> + timers[i].timer_ops = NULL; >> + } >> + } >> + >> + return 0; >> +} >> + >> /** >> * omap_rproc_mbox_callback() - inbound mailbox message handler >> * @client: mailbox client pointer used for requesting the mailbox channel >> @@ -228,6 +452,12 @@ static int omap_rproc_start(struct rproc *rproc) >> goto put_mbox; >> } >> >> + ret = omap_rproc_enable_timers(rproc, true); >> + if (ret) { >> + dev_err(dev, "omap_rproc_enable_timers failed: %d\n", ret); >> + goto put_mbox; >> + } >> + >> reset_control_deassert(oproc->reset); >> >> return 0; >> @@ -241,9 +471,14 @@ static int omap_rproc_start(struct rproc *rproc) >> static int omap_rproc_stop(struct rproc *rproc) >> { >> struct omap_rproc *oproc = rproc->priv; >> + int ret; >> >> reset_control_assert(oproc->reset); >> >> + ret = omap_rproc_disable_timers(rproc, true); >> + if (ret) >> + return ret; >> + >> mbox_free_channel(oproc->mbox); >> >> return 0; >> @@ -528,6 +763,29 @@ static int omap_rproc_probe(struct platform_device *pdev) >> if (ret) >> goto free_rproc; >> >> + /* >> + * Timer nodes are directly used in client nodes as phandles, so >> + * retrieve the count using appropriate size >> + */ >> + oproc->num_timers = of_count_phandle_with_args(np, "ti,timers", NULL); >> + if (oproc->num_timers <= 0) { >> + dev_dbg(&pdev->dev, "device does not have timers, status = %d\n", >> + oproc->num_timers); >> + oproc->num_timers = 0; >> + } >> + >> + if (oproc->num_timers) { >> + oproc->timers = devm_kzalloc(&pdev->dev, sizeof(*oproc->timers) >> + * oproc->num_timers, GFP_KERNEL); > > Please use devm_kcalloc().
Will fix that.
-Tero
> > More comments to come tomorrow, > Mathieu > >> + if (!oproc->timers) { >> + ret = -ENOMEM; >> + goto free_rproc; >> + } >> + >> + dev_dbg(&pdev->dev, "device has %d tick timers\n", >> + oproc->num_timers); >> + } >> + >> ret = of_reserved_mem_device_init(&pdev->dev); >> if (ret) { >> dev_err(&pdev->dev, "device does not have specific CMA pool\n"); >> -- >> 2.17.1 >> >> --
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