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Message-Id: <1435937609-18623-1-git-send-email-davidcdueck@googlemail.com>
Date: Fri, 3 Jul 2015 17:33:28 +0200
From: David Dueck <davidcdueck@...glemail.com>
To: linux-kernel@...r.kernel.org
Cc: bigeasy@...utronix.de, nicolas.ferre@...el.com,
alexandre.belloni@...e-electrons.com, ludovic.desroches@...el.com,
boris.brezillon@...e-electrons.com,
maxime.ripard@...e-electrons.com, wsteinwender@....com,
antoine.tenart@...e-electrons.com, mail@...n.io, c.emde@...dl.org,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH RFC 1/2] at91: make using irqs for clock handling optional
Deactivating the use of interrupts here fixes a crash on early boot with
RT-Preempt.
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 4.0.0-rt4+ #197
Hardware name: Atmel SAMA5
task: c068f338 ti: c068a000 task.ti: c068a000
PC is at wake_up_process+0x8/0x4c
LR is at kthread_create_on_node+0xa0/0x148
pc : [<c0037478>] lr : [<c00317b0>] psr: 600001d3
sp : c068bec0 ip : 00000000 fp : 00100100
r10: 00000000 r9 : cf402380 r8 : ffffffff
r7 : c0047ae0 r6 : c068bedc r5 : c06926b4 r4 : 00000000
r3 : c06bbf1c r2 : c068becc r1 : c068f338 r0 : 00000000
Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
Control: 10c53c7d Table: 20004059 DAC: 00000015
Process swapper (pid: 0, stack limit = 0xc068a210)
Stack: (0xc068bec0 to 0xc068c000)
bec0: c06bbf1c cf402700 00100100 c00317b0 00000010 c068bf00 fefffc00 00000000
bee0: c068bee0 c068bee0 00000001 cf404c00 cf4026c0 cf404c00 00000010 00000010
bf00: c00481c0 c05b05bc 00000010 c05f52fc cfdaa47c cf4026c0 00040080 cf404c00
bf20: c037286c 00000010 cf402380 c004858c cfdaa47c c050d548 fefffc00 00000010
bf40: cf402380 c06d2a1c cf402388 c0676b70 c05f52fc cf402380 00000001 cfdaa47c
bf60: cf4023c0 00000000 c06b450c cf402400 00200200 c0676888 00000000 00000001
bf80: 00000000 00000000 00000000 00000001 c06bb280 00000001 ffffffff c068c000
bfa0: c06bb280 c0682808 cfffcb40 c0660264 00000001 c065cb10 ffffffff ffffffff
bfc0: c065c66c 00000000 00000000 c0682808 00000000 c06bb454 c068c050 c0682804
bfe0: c0690550 20004059 410fc051 00000000 00000000 20008070 00000000 00000000
Code: eb1238c0 eafffff3 e92d4818 e1a04000 (e5903000)
---[ end trace 0000000000000001 ]---
Signed-off-by: David Dueck <davidcdueck@...glemail.com>
---
drivers/clk/Kconfig | 1 +
drivers/clk/at91/Kconfig | 4 ++++
drivers/clk/at91/clk-main.c | 34 ++++++++++++++++++++++++++++++++++
drivers/clk/at91/clk-master.c | 11 +++++++++++
drivers/clk/at91/clk-pll.c | 11 ++++++++++-
drivers/clk/at91/clk-system.c | 11 +++++++++++
drivers/clk/at91/clk-utmi.c | 10 ++++++++++
drivers/clk/at91/pmc.c | 6 ++++++
8 files changed, 87 insertions(+), 1 deletion(-)
create mode 100644 drivers/clk/at91/Kconfig
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 0b474a0..b1a56f3 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -147,6 +147,7 @@ source "drivers/clk/qcom/Kconfig"
endmenu
+source "drivers/clk/at91/Kconfig"
source "drivers/clk/bcm/Kconfig"
source "drivers/clk/mvebu/Kconfig"
diff --git a/drivers/clk/at91/Kconfig b/drivers/clk/at91/Kconfig
new file mode 100644
index 0000000..343c758
--- /dev/null
+++ b/drivers/clk/at91/Kconfig
@@ -0,0 +1,4 @@
+config AT91_CLK_POLLING
+ bool "AT91 clk polling"
+ help
+ Poll clocks instead of using interrupts
diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
index 59fa3cc..11033ae 100644
--- a/drivers/clk/at91/clk-main.c
+++ b/drivers/clk/at91/clk-main.c
@@ -69,6 +69,7 @@ struct clk_sam9x5_main {
#define to_clk_sam9x5_main(hw) container_of(hw, struct clk_sam9x5_main, hw)
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_main_osc_irq_handler(int irq, void *dev_id)
{
struct clk_main_osc *osc = dev_id;
@@ -78,6 +79,7 @@ static irqreturn_t clk_main_osc_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_main_osc_prepare(struct clk_hw *hw)
{
@@ -95,9 +97,13 @@ static int clk_main_osc_prepare(struct clk_hw *hw)
}
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(osc->irq);
wait_event(osc->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS);
+#endif
}
return 0;
@@ -145,7 +151,9 @@ at91_clk_register_main_osc(struct at91_pmc *pmc,
const char *parent_name,
bool bypass)
{
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
struct clk_main_osc *osc;
struct clk *clk = NULL;
struct clk_init_data init;
@@ -169,11 +177,13 @@ at91_clk_register_main_osc(struct at91_pmc *pmc,
init_waitqueue_head(&osc->wait);
irq_set_status_flags(osc->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(osc->irq, clk_main_osc_irq_handler,
IRQF_TRIGGER_HIGH, name, osc);
if (ret)
return ERR_PTR(ret);
+#endif
if (bypass)
pmc_write(pmc, AT91_CKGR_MOR,
(pmc_read(pmc, AT91_CKGR_MOR) &
@@ -213,6 +223,7 @@ void __init of_at91rm9200_clk_main_osc_setup(struct device_node *np,
of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_main_rc_osc_irq_handler(int irq, void *dev_id)
{
struct clk_main_rc_osc *osc = dev_id;
@@ -222,6 +233,7 @@ static irqreturn_t clk_main_rc_osc_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_main_rc_osc_prepare(struct clk_hw *hw)
{
@@ -237,9 +249,13 @@ static int clk_main_rc_osc_prepare(struct clk_hw *hw)
}
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCRCS)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(osc->irq);
wait_event(osc->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCRCS);
+#endif
}
return 0;
@@ -297,7 +313,9 @@ at91_clk_register_main_rc_osc(struct at91_pmc *pmc,
const char *name,
u32 frequency, u32 accuracy)
{
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
struct clk_main_rc_osc *osc;
struct clk *clk = NULL;
struct clk_init_data init;
@@ -323,11 +341,13 @@ at91_clk_register_main_rc_osc(struct at91_pmc *pmc,
init_waitqueue_head(&osc->wait);
irq_set_status_flags(osc->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(osc->irq, clk_main_rc_osc_irq_handler,
IRQF_TRIGGER_HIGH, name, osc);
if (ret)
return ERR_PTR(ret);
+#endif
clk = clk_register(NULL, &osc->hw);
if (IS_ERR(clk)) {
free_irq(irq, osc);
@@ -476,6 +496,7 @@ void __init of_at91rm9200_clk_main_setup(struct device_node *np,
of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_sam9x5_main_irq_handler(int irq, void *dev_id)
{
struct clk_sam9x5_main *clkmain = dev_id;
@@ -485,6 +506,7 @@ static irqreturn_t clk_sam9x5_main_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_sam9x5_main_prepare(struct clk_hw *hw)
{
@@ -492,9 +514,13 @@ static int clk_sam9x5_main_prepare(struct clk_hw *hw)
struct at91_pmc *pmc = clkmain->pmc;
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS)) {
+#ifdef CONFIG_AT91_CLK_POLLING
enable_irq(clkmain->irq);
wait_event(clkmain->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS);
+#else
+ cpu_relax();
+#endif
}
return clk_main_probe_frequency(pmc);
@@ -532,9 +558,13 @@ static int clk_sam9x5_main_set_parent(struct clk_hw *hw, u8 index)
pmc_write(pmc, AT91_CKGR_MOR, tmp & ~AT91_PMC_MOSCSEL);
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(clkmain->irq);
wait_event(clkmain->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS);
+#endif
}
return 0;
@@ -562,7 +592,9 @@ at91_clk_register_sam9x5_main(struct at91_pmc *pmc,
const char **parent_names,
int num_parents)
{
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
struct clk_sam9x5_main *clkmain;
struct clk *clk = NULL;
struct clk_init_data init;
@@ -590,10 +622,12 @@ at91_clk_register_sam9x5_main(struct at91_pmc *pmc,
AT91_PMC_MOSCEN);
init_waitqueue_head(&clkmain->wait);
irq_set_status_flags(clkmain->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(clkmain->irq, clk_sam9x5_main_irq_handler,
IRQF_TRIGGER_HIGH, name, clkmain);
if (ret)
return ERR_PTR(ret);
+#endif
clk = clk_register(NULL, &clkmain->hw);
if (IS_ERR(clk)) {
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index c1af80b..8cd7c57 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -51,6 +51,7 @@ struct clk_master {
const struct clk_master_characteristics *characteristics;
};
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_master_irq_handler(int irq, void *dev_id)
{
struct clk_master *master = (struct clk_master *)dev_id;
@@ -60,15 +61,21 @@ static irqreturn_t clk_master_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
+
static int clk_master_prepare(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
struct at91_pmc *pmc = master->pmc;
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(master->irq);
wait_event(master->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
+#endif
}
return 0;
@@ -138,7 +145,9 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
const struct clk_master_layout *layout,
const struct clk_master_characteristics *characteristics)
{
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
struct clk_master *master;
struct clk *clk = NULL;
struct clk_init_data init;
@@ -163,10 +172,12 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
master->irq = irq;
init_waitqueue_head(&master->wait);
irq_set_status_flags(master->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(master->irq, clk_master_irq_handler,
IRQF_TRIGGER_HIGH, "clk-master", master);
if (ret)
return ERR_PTR(ret);
+#endif
clk = clk_register(NULL, &master->hw);
if (IS_ERR(clk))
diff --git a/drivers/clk/at91/clk-pll.c b/drivers/clk/at91/clk-pll.c
index 6ec79db..a8b3cc5 100644
--- a/drivers/clk/at91/clk-pll.c
+++ b/drivers/clk/at91/clk-pll.c
@@ -69,6 +69,7 @@ struct clk_pll {
const struct clk_pll_characteristics *characteristics;
};
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_pll_irq_handler(int irq, void *dev_id)
{
struct clk_pll *pll = (struct clk_pll *)dev_id;
@@ -78,6 +79,7 @@ static irqreturn_t clk_pll_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_pll_prepare(struct clk_hw *hw)
{
@@ -119,9 +121,13 @@ static int clk_pll_prepare(struct clk_hw *hw)
pmc_write(pmc, offset, pllr);
while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(pll->irq);
wait_event(pll->wait,
pmc_read(pmc, AT91_PMC_SR) & mask);
+#endif
}
return 0;
@@ -308,7 +314,9 @@ at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
struct clk_pll *pll;
struct clk *clk = NULL;
struct clk_init_data init;
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
int offset = PLL_REG(id);
u32 tmp;
@@ -336,11 +344,12 @@ at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
pll->mul = PLL_MUL(tmp, layout);
init_waitqueue_head(&pll->wait);
irq_set_status_flags(pll->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(pll->irq, clk_pll_irq_handler, IRQF_TRIGGER_HIGH,
id ? "clk-pllb" : "clk-plla", pll);
if (ret)
return ERR_PTR(ret);
-
+#endif
clk = clk_register(NULL, &pll->hw);
if (IS_ERR(clk))
kfree(pll);
diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c
index a76d03f..bb7c82a 100644
--- a/drivers/clk/at91/clk-system.c
+++ b/drivers/clk/at91/clk-system.c
@@ -39,6 +39,8 @@ static inline int is_pck(int id)
{
return (id >= 8) && (id <= 15);
}
+
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_system_irq_handler(int irq, void *dev_id)
{
struct clk_system *sys = (struct clk_system *)dev_id;
@@ -48,6 +50,7 @@ static irqreturn_t clk_system_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_system_prepare(struct clk_hw *hw)
{
@@ -61,12 +64,16 @@ static int clk_system_prepare(struct clk_hw *hw)
return 0;
while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
+#ifdef CONFIG_AT91_CLK_POLLING
if (sys->irq) {
enable_irq(sys->irq);
wait_event(sys->wait,
pmc_read(pmc, AT91_PMC_SR) & mask);
} else
cpu_relax();
+#else
+ cpu_relax();
+#endif
}
return 0;
}
@@ -106,7 +113,9 @@ at91_clk_register_system(struct at91_pmc *pmc, const char *name,
struct clk_system *sys;
struct clk *clk = NULL;
struct clk_init_data init;
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
if (!parent_name || id > SYSTEM_MAX_ID)
return ERR_PTR(-EINVAL);
@@ -128,10 +137,12 @@ at91_clk_register_system(struct at91_pmc *pmc, const char *name,
if (irq) {
init_waitqueue_head(&sys->wait);
irq_set_status_flags(sys->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(sys->irq, clk_system_irq_handler,
IRQF_TRIGGER_HIGH, name, sys);
if (ret)
return ERR_PTR(ret);
+#endif
}
clk = clk_register(NULL, &sys->hw);
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
index ae3263b..60fdf30 100644
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -33,6 +33,7 @@ struct clk_utmi {
#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
{
struct clk_utmi *utmi = (struct clk_utmi *)dev_id;
@@ -42,6 +43,7 @@ static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+#endif
static int clk_utmi_prepare(struct clk_hw *hw)
{
@@ -53,9 +55,13 @@ static int clk_utmi_prepare(struct clk_hw *hw)
pmc_write(pmc, AT91_CKGR_UCKR, tmp);
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {
+#ifdef CONFIG_AT91_CLK_POLLING
+ cpu_relax();
+#else
enable_irq(utmi->irq);
wait_event(utmi->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
+#endif
}
return 0;
@@ -96,7 +102,9 @@ static struct clk * __init
at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
const char *name, const char *parent_name)
{
+#ifndef CONFIG_AT91_CLK_POLLING
int ret;
+#endif
struct clk_utmi *utmi;
struct clk *clk = NULL;
struct clk_init_data init;
@@ -116,11 +124,13 @@ at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
utmi->irq = irq;
init_waitqueue_head(&utmi->wait);
irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);
+#ifndef CONFIG_AT91_CLK_POLLING
ret = request_irq(utmi->irq, clk_utmi_irq_handler,
IRQF_TRIGGER_HIGH, "clk-utmi", utmi);
if (ret)
return ERR_PTR(ret);
+#endif
clk = clk_register(NULL, &utmi->hw);
if (IS_ERR(clk))
kfree(utmi);
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 3f27d21..3c592bc 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -158,6 +158,7 @@ static struct irq_domain_ops pmc_irq_ops = {
.xlate = pmc_irq_domain_xlate,
};
+#ifndef CONFIG_AT91_CLK_POLLING
static irqreturn_t pmc_irq_handler(int irq, void *data)
{
struct at91_pmc *pmc = (struct at91_pmc *)data;
@@ -173,6 +174,7 @@ static irqreturn_t pmc_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
+#endif
static const struct at91_pmc_caps at91rm9200_caps = {
.available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
@@ -241,14 +243,18 @@ static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
goto out_free_pmc;
pmc_write(pmc, AT91_PMC_IDR, 0xffffffff);
+#ifndef CONFIG_AT91_CLK_POLLING
if (request_irq(pmc->virq, pmc_irq_handler,
IRQF_SHARED | IRQF_COND_SUSPEND, "pmc", pmc))
goto out_remove_irqdomain;
+#endif
return pmc;
+#ifndef CONFIG_AT91_CLK_POLLING
out_remove_irqdomain:
irq_domain_remove(pmc->irqdomain);
+#endif
out_free_pmc:
kfree(pmc);
--
2.4.4
--
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