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spi: sprd: adi: Change hwlock to be optional 

Now Spreadtrum ADI controller supplies multiple master accessing channel
to support multiple subsystems accessing, instead of using a hardware
spinlock to synchronize between the multiple subsystems.

To keep backward compatibility, we should change the hardware spinlock
to be optional. Moreover change to use of_hwspin_lock_get_id() function
which return -ENOENT error number to indicate no hwlock support.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Link: https://lore.kernel.org/r/2abe7dcf210e4197f8c5ece7fc6d6cc1eda8c655.1564125131.git.baolin.wang@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Baolin Wang 2019-07-26 15:20:52 +08:00 committed by Mark Brown
parent e6d722ca09
commit f9adf61e98
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 41 additions and 25 deletions
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66
drivers/spi/spi-sprd-adi.c
View File

@ -165,14 +165,16 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val)
int read_timeout = ADI_READ_TIMEOUT;
unsigned long flags;
u32 val, rd_addr;
int ret;
int ret = 0;
ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
ADI_HWSPINLOCK_TIMEOUT,
&flags);
if (ret) {
dev_err(sadi->dev, "get the hw lock failed\n");
return ret;
if (sadi->hwlock) {
ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
ADI_HWSPINLOCK_TIMEOUT,
&flags);
if (ret) {
dev_err(sadi->dev, "get the hw lock failed\n");
return ret;
}
}
/*
@ -219,7 +221,8 @@ static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val)
*read_val = val & RD_VALUE_MASK;
out:
hwspin_unlock_irqrestore(sadi->hwlock, &flags);
if (sadi->hwlock)
hwspin_unlock_irqrestore(sadi->hwlock, &flags);
return ret;
}
@ -230,12 +233,14 @@ static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val)
unsigned long flags;
int ret;
ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
ADI_HWSPINLOCK_TIMEOUT,
&flags);
if (ret) {
dev_err(sadi->dev, "get the hw lock failed\n");
return ret;
if (sadi->hwlock) {
ret = hwspin_lock_timeout_irqsave(sadi->hwlock,
ADI_HWSPINLOCK_TIMEOUT,
&flags);
if (ret) {
dev_err(sadi->dev, "get the hw lock failed\n");
return ret;
}
}
ret = sprd_adi_drain_fifo(sadi);
@ -261,7 +266,8 @@ static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val)
}
out:
hwspin_unlock_irqrestore(sadi->hwlock, &flags);
if (sadi->hwlock)
hwspin_unlock_irqrestore(sadi->hwlock, &flags);
return ret;
}
@ -476,16 +482,26 @@ static int sprd_adi_probe(struct platform_device *pdev)
sadi->slave_pbase = res->start + ADI_SLAVE_OFFSET;
sadi->ctlr = ctlr;
sadi->dev = &pdev->dev;
ret = of_hwspin_lock_get_id_byname(np, "adi");
if (ret < 0) {
dev_err(&pdev->dev, "can not get the hardware spinlock\n");
goto put_ctlr;
}
sadi->hwlock = devm_hwspin_lock_request_specific(&pdev->dev, ret);
if (!sadi->hwlock) {
ret = -ENXIO;
goto put_ctlr;
ret = of_hwspin_lock_get_id(np, 0);
if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
sadi->hwlock =
devm_hwspin_lock_request_specific(&pdev->dev, ret);
if (!sadi->hwlock) {
ret = -ENXIO;
goto put_ctlr;
}
} else {
switch (ret) {
case -ENOENT:
dev_info(&pdev->dev, "no hardware spinlock supplied\n");
break;
default:
dev_err(&pdev->dev,
"failed to find hwlock id, %d\n", ret);
/* fall-through */
case -EPROBE_DEFER:
goto put_ctlr;
}
}
sprd_adi_hw_init(sadi);