linux/arch/arm/mach-omap2/omap_device.c
Grygorii Strashko fe8291e82b ARM: OMAP2+: omap-device: fix race deferred probe of omap_hsmmc vs omap_device_late_init
Kernel fails to boot 50% of times (form build to build) with
RT-patchset applied due to the following race - on late boot
stages deferred_probe_work_func->omap_hsmmc_probe races with omap_device_late_ini.

The same issue has been reported now on linux-next (4.3) by Keerthy [1]

late_initcall
 - deferred_probe_initcal() tries to re-probe all pending driver's probe.

- later on, some driver is probing in this case It's cpsw.c
  (but could be any other drivers)
  cpsw_init
  - platform_driver_register
    - really_probe
       - driver_bound
         - driver_deferred_probe_trigger
  and boot proceed.
  So, at this moment we have deferred_probe_work_func scheduled.

late_initcall_sync
  - omap_device_late_init
    - omap_device_idle

CPU1					CPU2
  - deferred_probe_work_func
    - really_probe
      - omap_hsmmc_probe
	- pm_runtime_get_sync
					late_initcall_sync
					- omap_device_late_init
						if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
							if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
								- omap_device_idle [ops - IP is disabled]
	- [fail]
	- pm_runtime_put_sync
          - omap_hsmmc_runtime_suspend [ooops!]

== log ==
 omap_hsmmc 480b4000.mmc: unable to get vmmc regulator -517
 davinci_mdio 48485000.mdio: davinci mdio revision 1.6
 davinci_mdio 48485000.mdio: detected phy mask fffffff3
 libphy: 48485000.mdio: probed
 davinci_mdio 48485000.mdio: phy[2]: device 48485000.mdio:02, driver unknown
 davinci_mdio 48485000.mdio: phy[3]: device 48485000.mdio:03, driver unknown
 omap_hsmmc 480b4000.mmc: unable to get vmmc regulator -517
 cpsw 48484000.ethernet: Detected MACID = b4:99:4c:c7:d2:48
 cpsw 48484000.ethernet: cpsw: Detected MACID = b4:99:4c:c7:d2:49
 hctosys: unable to open rtc device (rtc0)
 omap_hsmmc 480b4000.mmc: omap_device_late_idle: enabled but no driver.  Idling
 ldousb: disabling
 Unhandled fault: imprecise external abort (0x1406) at 0x00000000
 [00000000] *pgd=00000000
 Internal error: : 1406 [#1] PREEMPT SMP ARM
 Modules linked in:
 CPU: 1 PID: 58 Comm: kworker/u4:1 Not tainted 4.1.2-rt1-00467-g6da3c0a-dirty #5
 Hardware name: Generic DRA74X (Flattened Device Tree)
 Workqueue: deferwq deferred_probe_work_func
 task: ee6ddb00 ti: edd3c000 task.ti: edd3c000
 PC is at omap_hsmmc_runtime_suspend+0x1c/0x12c
 LR is at _od_runtime_suspend+0xc/0x24
 pc : [<c0471998>]    lr : [<c0029590>]    psr: a0000013
 sp : edd3dda0  ip : ee6ddb00  fp : c07be540
 r10: 00000000  r9 : c07be540  r8 : 00000008
 r7 : 00000000  r6 : ee646c10  r5 : ee646c10  r4 : edd79380
 r3 : fa0b4100  r2 : 00000000  r1 : 00000000  r0 : ee646c10
 Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
 Control: 10c5387d  Table: 8000406a  DAC: 00000015
 Process kworker/u4:1 (pid: 58, stack limit = 0xedd3c218)
 Stack: (0xedd3dda0 to 0xedd3e000)
 dda0: ee646c70 ee646c10 c0029584 00000000 00000008 c0029590 ee646c70 ee646c10
 ddc0: c0029584 c03adfb8 ee646c10 00000004 0000000c c03adff0 ee646c10 00000004
 dde0: 0000000c c03ae4ec 00000000 edd3c000 ee646c10 00000004 ee646c70 00000004
 de00: fa0b4000 c03aec20 ee6ddb00 ee646c10 00000004 ee646c70 ee646c10 fffffdfb
 de20: edd79380 00000000 fa0b4000 c03aee90 fffffdfb edd79000 ee646c00 c0474290
 de40: 00000000 edda24c0 edd79380 edc81f00 00000000 00000200 00000001 c06dd488
 de60: edda3960 ee646c10 ee646c10 c0824cc4 fffffdfb c0880c94 00000002 edc92600
 de80: c0836378 c03a7f84 ee646c10 c0824cc4 00000000 c0880c80 c0880c94 c03a6568
 dea0: 00000000 ee646c10 c03a66ac ee4f8000 00000000 00000001 edc92600 c03a4b40
 dec0: ee404c94 edc83c4c ee646c10 ee646c10 ee646c44 c03a63c4 ee646c10 ee646c10
 dee0: c0814448 c03a5aa8 ee646c10 c0814220 edd3c000 c03a5ec0 c0814250 ee6be400
 df00: edd3c000 c004e5bc ee6ddb01 00000078 ee6ddb00 ee4f8000 ee6be418 edd3c000
 df20: ee4f8028 00000088 c0836045 ee4f8000 ee6be400 c004e928 ee4f8028 00000000
 df40: c004e8ec 00000000 ee6bf1c0 ee6be400 c004e8ec 00000000 00000000 00000000
 df60: 00000000 c0053450 2e56fa97 00000000 afdffbd7 ee6be400 00000000 00000000
 df80: edd3df80 edd3df80 00000000 00000000 edd3df90 edd3df90 edd3dfac ee6bf1c0
 dfa0: c0053384 00000000 00000000 c000f668 00000000 00000000 00000000 00000000
 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 f1fc9d7e febfbdff
 [<c0471998>] (omap_hsmmc_runtime_suspend) from [<c0029590>] (_od_runtime_suspend+0xc/0x24)
 [<c0029590>] (_od_runtime_suspend) from [<c03adfb8>] (__rpm_callback+0x24/0x3c)
 [<c03adfb8>] (__rpm_callback) from [<c03adff0>] (rpm_callback+0x20/0x80)
 [<c03adff0>] (rpm_callback) from [<c03ae4ec>] (rpm_suspend+0xe4/0x618)
 [<c03ae4ec>] (rpm_suspend) from [<c03aee90>] (__pm_runtime_idle+0x60/0x80)
 [<c03aee90>] (__pm_runtime_idle) from [<c0474290>] (omap_hsmmc_probe+0x6bc/0xa7c)
 [<c0474290>] (omap_hsmmc_probe) from [<c03a7f84>] (platform_drv_probe+0x44/0xa4)
 [<c03a7f84>] (platform_drv_probe) from [<c03a6568>] (driver_probe_device+0x170/0x2b4)
 [<c03a6568>] (driver_probe_device) from [<c03a4b40>] (bus_for_each_drv+0x64/0x98)
 [<c03a4b40>] (bus_for_each_drv) from [<c03a63c4>] (device_attach+0x70/0x88)
 [<c03a63c4>] (device_attach) from [<c03a5aa8>] (bus_probe_device+0x84/0xac)
 [<c03a5aa8>] (bus_probe_device) from [<c03a5ec0>] (deferred_probe_work_func+0x58/0x88)
 [<c03a5ec0>] (deferred_probe_work_func) from [<c004e5bc>] (process_one_work+0x134/0x464)
 [<c004e5bc>] (process_one_work) from [<c004e928>] (worker_thread+0x3c/0x4fc)
 [<c004e928>] (worker_thread) from [<c0053450>] (kthread+0xcc/0xe4)
 [<c0053450>] (kthread) from [<c000f668>] (ret_from_fork+0x14/0x2c)
 Code: e594302c e593202c e584205c e594302c (e5932128)
 ---[ end trace 0000000000000002 ]---

The issue happens because omap_device_late_init() do not take into
account that some drivers are present, but their probes were not
finished successfully and where deferred instead. This is the valid
case, and omap_device_late_init() should not idle such devices.

To fix this issue, the value of omap_device->_driver_status field
should be checked not only for BUS_NOTIFY_BOUND_DRIVER (driver is
present and has been bound to device successfully), but also checked
for BUS_NOTIFY_BIND_DRIVER (driver about to be bound) - which means
driver is present and there was try to bind it to device.

[1] http://www.spinics.net/lists/arm-kernel/msg441880.html
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2015-09-01 13:59:24 -07:00

926 lines
24 KiB
C

/*
* omap_device implementation
*
* Copyright (C) 2009-2010 Nokia Corporation
* Paul Walmsley, Kevin Hilman
*
* Developed in collaboration with (alphabetical order): Benoit
* Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
* Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
* Woodruff
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This code provides a consistent interface for OMAP device drivers
* to control power management and interconnect properties of their
* devices.
*
* In the medium- to long-term, this code should be implemented as a
* proper omap_bus/omap_device in Linux, no more platform_data func
* pointers
*
*
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/notifier.h>
#include "common.h"
#include "soc.h"
#include "omap_device.h"
#include "omap_hwmod.h"
/* Private functions */
static void _add_clkdev(struct omap_device *od, const char *clk_alias,
const char *clk_name)
{
struct clk *r;
int rc;
if (!clk_alias || !clk_name)
return;
dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
if (!IS_ERR(r)) {
dev_dbg(&od->pdev->dev,
"alias %s already exists\n", clk_alias);
clk_put(r);
return;
}
rc = clk_add_alias(clk_alias, dev_name(&od->pdev->dev), clk_name, NULL);
if (rc) {
if (rc == -ENODEV || rc == -ENOMEM)
dev_err(&od->pdev->dev,
"clkdev_alloc for %s failed\n", clk_alias);
else
dev_err(&od->pdev->dev,
"clk_get for %s failed\n", clk_name);
}
}
/**
* _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
* and main clock
* @od: struct omap_device *od
* @oh: struct omap_hwmod *oh
*
* For the main clock and every optional clock present per hwmod per
* omap_device, this function adds an entry in the clkdev table of the
* form <dev-id=dev_name, con-id=role> if it does not exist already.
*
* The function is called from inside omap_device_build_ss(), after
* omap_device_register.
*
* This allows drivers to get a pointer to its optional clocks based on its role
* by calling clk_get(<dev*>, <role>).
* In the case of the main clock, a "fck" alias is used.
*
* No return value.
*/
static void _add_hwmod_clocks_clkdev(struct omap_device *od,
struct omap_hwmod *oh)
{
int i;
_add_clkdev(od, "fck", oh->main_clk);
for (i = 0; i < oh->opt_clks_cnt; i++)
_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
}
/**
* omap_device_build_from_dt - build an omap_device with multiple hwmods
* @pdev_name: name of the platform_device driver to use
* @pdev_id: this platform_device's connection ID
* @oh: ptr to the single omap_hwmod that backs this omap_device
* @pdata: platform_data ptr to associate with the platform_device
* @pdata_len: amount of memory pointed to by @pdata
*
* Function for building an omap_device already registered from device-tree
*
* Returns 0 or PTR_ERR() on error.
*/
static int omap_device_build_from_dt(struct platform_device *pdev)
{
struct omap_hwmod **hwmods;
struct omap_device *od;
struct omap_hwmod *oh;
struct device_node *node = pdev->dev.of_node;
const char *oh_name;
int oh_cnt, i, ret = 0;
bool device_active = false;
oh_cnt = of_property_count_strings(node, "ti,hwmods");
if (oh_cnt <= 0) {
dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
return -ENODEV;
}
hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
if (!hwmods) {
ret = -ENOMEM;
goto odbfd_exit;
}
for (i = 0; i < oh_cnt; i++) {
of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
oh_name);
ret = -EINVAL;
goto odbfd_exit1;
}
hwmods[i] = oh;
if (oh->flags & HWMOD_INIT_NO_IDLE)
device_active = true;
}
od = omap_device_alloc(pdev, hwmods, oh_cnt);
if (IS_ERR(od)) {
dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
oh_name);
ret = PTR_ERR(od);
goto odbfd_exit1;
}
/* Fix up missing resource names */
for (i = 0; i < pdev->num_resources; i++) {
struct resource *r = &pdev->resource[i];
if (r->name == NULL)
r->name = dev_name(&pdev->dev);
}
pdev->dev.pm_domain = &omap_device_pm_domain;
if (device_active) {
omap_device_enable(pdev);
pm_runtime_set_active(&pdev->dev);
}
odbfd_exit1:
kfree(hwmods);
odbfd_exit:
/* if data/we are at fault.. load up a fail handler */
if (ret)
pdev->dev.pm_domain = &omap_device_fail_pm_domain;
return ret;
}
static int _omap_device_notifier_call(struct notifier_block *nb,
unsigned long event, void *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od;
switch (event) {
case BUS_NOTIFY_DEL_DEVICE:
if (pdev->archdata.od)
omap_device_delete(pdev->archdata.od);
break;
case BUS_NOTIFY_ADD_DEVICE:
if (pdev->dev.of_node)
omap_device_build_from_dt(pdev);
omap_auxdata_legacy_init(dev);
/* fall through */
default:
od = to_omap_device(pdev);
if (od)
od->_driver_status = event;
}
return NOTIFY_DONE;
}
/**
* _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
* @od: struct omap_device *od
*
* Enable all underlying hwmods. Returns 0.
*/
static int _omap_device_enable_hwmods(struct omap_device *od)
{
int ret = 0;
int i;
for (i = 0; i < od->hwmods_cnt; i++)
ret |= omap_hwmod_enable(od->hwmods[i]);
return ret;
}
/**
* _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
* @od: struct omap_device *od
*
* Idle all underlying hwmods. Returns 0.
*/
static int _omap_device_idle_hwmods(struct omap_device *od)
{
int ret = 0;
int i;
for (i = 0; i < od->hwmods_cnt; i++)
ret |= omap_hwmod_idle(od->hwmods[i]);
return ret;
}
/* Public functions for use by core code */
/**
* omap_device_get_context_loss_count - get lost context count
* @od: struct omap_device *
*
* Using the primary hwmod, query the context loss count for this
* device.
*
* Callers should consider context for this device lost any time this
* function returns a value different than the value the caller got
* the last time it called this function.
*
* If any hwmods exist for the omap_device assoiated with @pdev,
* return the context loss counter for that hwmod, otherwise return
* zero.
*/
int omap_device_get_context_loss_count(struct platform_device *pdev)
{
struct omap_device *od;
u32 ret = 0;
od = to_omap_device(pdev);
if (od->hwmods_cnt)
ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
return ret;
}
/**
* omap_device_count_resources - count number of struct resource entries needed
* @od: struct omap_device *
* @flags: Type of resources to include when counting (IRQ/DMA/MEM)
*
* Count the number of struct resource entries needed for this
* omap_device @od. Used by omap_device_build_ss() to determine how
* much memory to allocate before calling
* omap_device_fill_resources(). Returns the count.
*/
static int omap_device_count_resources(struct omap_device *od,
unsigned long flags)
{
int c = 0;
int i;
for (i = 0; i < od->hwmods_cnt; i++)
c += omap_hwmod_count_resources(od->hwmods[i], flags);
pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
od->pdev->name, c, od->hwmods_cnt);
return c;
}
/**
* omap_device_fill_resources - fill in array of struct resource
* @od: struct omap_device *
* @res: pointer to an array of struct resource to be filled in
*
* Populate one or more empty struct resource pointed to by @res with
* the resource data for this omap_device @od. Used by
* omap_device_build_ss() after calling omap_device_count_resources().
* Ideally this function would not be needed at all. If omap_device
* replaces platform_device, then we can specify our own
* get_resource()/ get_irq()/etc functions that use the underlying
* omap_hwmod information. Or if platform_device is extended to use
* subarchitecture-specific function pointers, the various
* platform_device functions can simply call omap_device internal
* functions to get device resources. Hacking around the existing
* platform_device code wastes memory. Returns 0.
*/
static int omap_device_fill_resources(struct omap_device *od,
struct resource *res)
{
int i, r;
for (i = 0; i < od->hwmods_cnt; i++) {
r = omap_hwmod_fill_resources(od->hwmods[i], res);
res += r;
}
return 0;
}
/**
* _od_fill_dma_resources - fill in array of struct resource with dma resources
* @od: struct omap_device *
* @res: pointer to an array of struct resource to be filled in
*
* Populate one or more empty struct resource pointed to by @res with
* the dma resource data for this omap_device @od. Used by
* omap_device_alloc() after calling omap_device_count_resources().
*
* Ideally this function would not be needed at all. If we have
* mechanism to get dma resources from DT.
*
* Returns 0.
*/
static int _od_fill_dma_resources(struct omap_device *od,
struct resource *res)
{
int i, r;
for (i = 0; i < od->hwmods_cnt; i++) {
r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
res += r;
}
return 0;
}
/**
* omap_device_alloc - allocate an omap_device
* @pdev: platform_device that will be included in this omap_device
* @oh: ptr to the single omap_hwmod that backs this omap_device
* @pdata: platform_data ptr to associate with the platform_device
* @pdata_len: amount of memory pointed to by @pdata
*
* Convenience function for allocating an omap_device structure and filling
* hwmods, and resources.
*
* Returns an struct omap_device pointer or ERR_PTR() on error;
*/
struct omap_device *omap_device_alloc(struct platform_device *pdev,
struct omap_hwmod **ohs, int oh_cnt)
{
int ret = -ENOMEM;
struct omap_device *od;
struct resource *res = NULL;
int i, res_count;
struct omap_hwmod **hwmods;
od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
if (!od) {
ret = -ENOMEM;
goto oda_exit1;
}
od->hwmods_cnt = oh_cnt;
hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
if (!hwmods)
goto oda_exit2;
od->hwmods = hwmods;
od->pdev = pdev;
/*
* Non-DT Boot:
* Here, pdev->num_resources = 0, and we should get all the
* resources from hwmod.
*
* DT Boot:
* OF framework will construct the resource structure (currently
* does for MEM & IRQ resource) and we should respect/use these
* resources, killing hwmod dependency.
* If pdev->num_resources > 0, we assume that MEM & IRQ resources
* have been allocated by OF layer already (through DTB).
* As preparation for the future we examine the OF provided resources
* to see if we have DMA resources provided already. In this case
* there is no need to update the resources for the device, we use the
* OF provided ones.
*
* TODO: Once DMA resource is available from OF layer, we should
* kill filling any resources from hwmod.
*/
if (!pdev->num_resources) {
/* Count all resources for the device */
res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
IORESOURCE_DMA |
IORESOURCE_MEM);
} else {
/* Take a look if we already have DMA resource via DT */
for (i = 0; i < pdev->num_resources; i++) {
struct resource *r = &pdev->resource[i];
/* We have it, no need to touch the resources */
if (r->flags == IORESOURCE_DMA)
goto have_everything;
}
/* Count only DMA resources for the device */
res_count = omap_device_count_resources(od, IORESOURCE_DMA);
/* The device has no DMA resource, no need for update */
if (!res_count)
goto have_everything;
res_count += pdev->num_resources;
}
/* Allocate resources memory to account for new resources */
res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
if (!res)
goto oda_exit3;
if (!pdev->num_resources) {
dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
__func__, res_count);
omap_device_fill_resources(od, res);
} else {
dev_dbg(&pdev->dev,
"%s: appending %d DMA resources from hwmod\n",
__func__, res_count - pdev->num_resources);
memcpy(res, pdev->resource,
sizeof(struct resource) * pdev->num_resources);
_od_fill_dma_resources(od, &res[pdev->num_resources]);
}
ret = platform_device_add_resources(pdev, res, res_count);
kfree(res);
if (ret)
goto oda_exit3;
have_everything:
pdev->archdata.od = od;
for (i = 0; i < oh_cnt; i++) {
hwmods[i]->od = od;
_add_hwmod_clocks_clkdev(od, hwmods[i]);
}
return od;
oda_exit3:
kfree(hwmods);
oda_exit2:
kfree(od);
oda_exit1:
dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
return ERR_PTR(ret);
}
void omap_device_delete(struct omap_device *od)
{
if (!od)
return;
od->pdev->archdata.od = NULL;
kfree(od->hwmods);
kfree(od);
}
/**
* omap_device_build - build and register an omap_device with one omap_hwmod
* @pdev_name: name of the platform_device driver to use
* @pdev_id: this platform_device's connection ID
* @oh: ptr to the single omap_hwmod that backs this omap_device
* @pdata: platform_data ptr to associate with the platform_device
* @pdata_len: amount of memory pointed to by @pdata
*
* Convenience function for building and registering a single
* omap_device record, which in turn builds and registers a
* platform_device record. See omap_device_build_ss() for more
* information. Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
* passes along the return value of omap_device_build_ss().
*/
struct platform_device __init *omap_device_build(const char *pdev_name,
int pdev_id,
struct omap_hwmod *oh,
void *pdata, int pdata_len)
{
struct omap_hwmod *ohs[] = { oh };
if (!oh)
return ERR_PTR(-EINVAL);
return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
pdata_len);
}
/**
* omap_device_build_ss - build and register an omap_device with multiple hwmods
* @pdev_name: name of the platform_device driver to use
* @pdev_id: this platform_device's connection ID
* @oh: ptr to the single omap_hwmod that backs this omap_device
* @pdata: platform_data ptr to associate with the platform_device
* @pdata_len: amount of memory pointed to by @pdata
*
* Convenience function for building and registering an omap_device
* subsystem record. Subsystem records consist of multiple
* omap_hwmods. This function in turn builds and registers a
* platform_device record. Returns an ERR_PTR() on error, or passes
* along the return value of omap_device_register().
*/
struct platform_device __init *omap_device_build_ss(const char *pdev_name,
int pdev_id,
struct omap_hwmod **ohs,
int oh_cnt, void *pdata,
int pdata_len)
{
int ret = -ENOMEM;
struct platform_device *pdev;
struct omap_device *od;
if (!ohs || oh_cnt == 0 || !pdev_name)
return ERR_PTR(-EINVAL);
if (!pdata && pdata_len > 0)
return ERR_PTR(-EINVAL);
pdev = platform_device_alloc(pdev_name, pdev_id);
if (!pdev) {
ret = -ENOMEM;
goto odbs_exit;
}
/* Set the dev_name early to allow dev_xxx in omap_device_alloc */
if (pdev->id != -1)
dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
else
dev_set_name(&pdev->dev, "%s", pdev->name);
od = omap_device_alloc(pdev, ohs, oh_cnt);
if (IS_ERR(od))
goto odbs_exit1;
ret = platform_device_add_data(pdev, pdata, pdata_len);
if (ret)
goto odbs_exit2;
ret = omap_device_register(pdev);
if (ret)
goto odbs_exit2;
return pdev;
odbs_exit2:
omap_device_delete(od);
odbs_exit1:
platform_device_put(pdev);
odbs_exit:
pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
return ERR_PTR(ret);
}
#ifdef CONFIG_PM
static int _od_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int ret;
ret = pm_generic_runtime_suspend(dev);
if (ret)
return ret;
return omap_device_idle(pdev);
}
static int _od_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int ret;
ret = omap_device_enable(pdev);
if (ret)
return ret;
return pm_generic_runtime_resume(dev);
}
static int _od_fail_runtime_suspend(struct device *dev)
{
dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
return -ENODEV;
}
static int _od_fail_runtime_resume(struct device *dev)
{
dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
return -ENODEV;
}
#endif
#ifdef CONFIG_SUSPEND
static int _od_suspend_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od = to_omap_device(pdev);
int ret;
/* Don't attempt late suspend on a driver that is not bound */
if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
return 0;
ret = pm_generic_suspend_noirq(dev);
if (!ret && !pm_runtime_status_suspended(dev)) {
if (pm_generic_runtime_suspend(dev) == 0) {
pm_runtime_set_suspended(dev);
omap_device_idle(pdev);
od->flags |= OMAP_DEVICE_SUSPENDED;
}
}
return ret;
}
static int _od_resume_noirq(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od = to_omap_device(pdev);
if (od->flags & OMAP_DEVICE_SUSPENDED) {
od->flags &= ~OMAP_DEVICE_SUSPENDED;
omap_device_enable(pdev);
/*
* XXX: we run before core runtime pm has resumed itself. At
* this point in time, we just restore the runtime pm state and
* considering symmetric operations in resume, we donot expect
* to fail. If we failed, something changed in core runtime_pm
* framework OR some device driver messed things up, hence, WARN
*/
WARN(pm_runtime_set_active(dev),
"Could not set %s runtime state active\n", dev_name(dev));
pm_generic_runtime_resume(dev);
}
return pm_generic_resume_noirq(dev);
}
#else
#define _od_suspend_noirq NULL
#define _od_resume_noirq NULL
#endif
struct dev_pm_domain omap_device_fail_pm_domain = {
.ops = {
SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
_od_fail_runtime_resume, NULL)
}
};
struct dev_pm_domain omap_device_pm_domain = {
.ops = {
SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
NULL)
USE_PLATFORM_PM_SLEEP_OPS
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq,
_od_resume_noirq)
}
};
/**
* omap_device_register - register an omap_device with one omap_hwmod
* @od: struct omap_device * to register
*
* Register the omap_device structure. This currently just calls
* platform_device_register() on the underlying platform_device.
* Returns the return value of platform_device_register().
*/
int omap_device_register(struct platform_device *pdev)
{
pr_debug("omap_device: %s: registering\n", pdev->name);
pdev->dev.pm_domain = &omap_device_pm_domain;
return platform_device_add(pdev);
}
/* Public functions for use by device drivers through struct platform_data */
/**
* omap_device_enable - fully activate an omap_device
* @od: struct omap_device * to activate
*
* Do whatever is necessary for the hwmods underlying omap_device @od
* to be accessible and ready to operate. This generally involves
* enabling clocks, setting SYSCONFIG registers; and in the future may
* involve remuxing pins. Device drivers should call this function
* indirectly via pm_runtime_get*(). Returns -EINVAL if called when
* the omap_device is already enabled, or passes along the return
* value of _omap_device_enable_hwmods().
*/
int omap_device_enable(struct platform_device *pdev)
{
int ret;
struct omap_device *od;
od = to_omap_device(pdev);
if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
dev_warn(&pdev->dev,
"omap_device: %s() called from invalid state %d\n",
__func__, od->_state);
return -EINVAL;
}
ret = _omap_device_enable_hwmods(od);
if (ret == 0)
od->_state = OMAP_DEVICE_STATE_ENABLED;
return ret;
}
/**
* omap_device_idle - idle an omap_device
* @od: struct omap_device * to idle
*
* Idle omap_device @od. Device drivers call this function indirectly
* via pm_runtime_put*(). Returns -EINVAL if the omap_device is not
* currently enabled, or passes along the return value of
* _omap_device_idle_hwmods().
*/
int omap_device_idle(struct platform_device *pdev)
{
int ret;
struct omap_device *od;
od = to_omap_device(pdev);
if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
dev_warn(&pdev->dev,
"omap_device: %s() called from invalid state %d\n",
__func__, od->_state);
return -EINVAL;
}
ret = _omap_device_idle_hwmods(od);
if (ret == 0)
od->_state = OMAP_DEVICE_STATE_IDLE;
return ret;
}
/**
* omap_device_assert_hardreset - set a device's hardreset line
* @pdev: struct platform_device * to reset
* @name: const char * name of the reset line
*
* Set the hardreset line identified by @name on the IP blocks
* associated with the hwmods backing the platform_device @pdev. All
* of the hwmods associated with @pdev must have the same hardreset
* line linked to them for this to work. Passes along the return value
* of omap_hwmod_assert_hardreset() in the event of any failure, or
* returns 0 upon success.
*/
int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
{
struct omap_device *od = to_omap_device(pdev);
int ret = 0;
int i;
for (i = 0; i < od->hwmods_cnt; i++) {
ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
if (ret)
break;
}
return ret;
}
/**
* omap_device_deassert_hardreset - release a device's hardreset line
* @pdev: struct platform_device * to reset
* @name: const char * name of the reset line
*
* Release the hardreset line identified by @name on the IP blocks
* associated with the hwmods backing the platform_device @pdev. All
* of the hwmods associated with @pdev must have the same hardreset
* line linked to them for this to work. Passes along the return
* value of omap_hwmod_deassert_hardreset() in the event of any
* failure, or returns 0 upon success.
*/
int omap_device_deassert_hardreset(struct platform_device *pdev,
const char *name)
{
struct omap_device *od = to_omap_device(pdev);
int ret = 0;
int i;
for (i = 0; i < od->hwmods_cnt; i++) {
ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
if (ret)
break;
}
return ret;
}
/**
* omap_device_get_by_hwmod_name() - convert a hwmod name to
* device pointer.
* @oh_name: name of the hwmod device
*
* Returns back a struct device * pointer associated with a hwmod
* device represented by a hwmod_name
*/
struct device *omap_device_get_by_hwmod_name(const char *oh_name)
{
struct omap_hwmod *oh;
if (!oh_name) {
WARN(1, "%s: no hwmod name!\n", __func__);
return ERR_PTR(-EINVAL);
}
oh = omap_hwmod_lookup(oh_name);
if (!oh) {
WARN(1, "%s: no hwmod for %s\n", __func__,
oh_name);
return ERR_PTR(-ENODEV);
}
if (!oh->od) {
WARN(1, "%s: no omap_device for %s\n", __func__,
oh_name);
return ERR_PTR(-ENODEV);
}
return &oh->od->pdev->dev;
}
static struct notifier_block platform_nb = {
.notifier_call = _omap_device_notifier_call,
};
static int __init omap_device_init(void)
{
bus_register_notifier(&platform_bus_type, &platform_nb);
return 0;
}
omap_core_initcall(omap_device_init);
/**
* omap_device_late_idle - idle devices without drivers
* @dev: struct device * associated with omap_device
* @data: unused
*
* Check the driver bound status of this device, and idle it
* if there is no driver attached.
*/
static int __init omap_device_late_idle(struct device *dev, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct omap_device *od = to_omap_device(pdev);
int i;
if (!od)
return 0;
/*
* If omap_device state is enabled, but has no driver bound,
* idle it.
*/
/*
* Some devices (like memory controllers) are always kept
* enabled, and should not be idled even with no drivers.
*/
for (i = 0; i < od->hwmods_cnt; i++)
if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
return 0;
if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER &&
od->_driver_status != BUS_NOTIFY_BIND_DRIVER) {
if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
dev_warn(dev, "%s: enabled but no driver. Idling\n",
__func__);
omap_device_idle(pdev);
}
}
return 0;
}
static int __init omap_device_late_init(void)
{
bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
WARN(!of_have_populated_dt(),
"legacy booting deprecated, please update to boot with .dts\n");
return 0;
}
omap_late_initcall_sync(omap_device_late_init);