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This patch removes the un-necessary ifdef CONFIG_ACPI and directly
uses the acpi_match_table from the driver pdev.
Signed-off-by: Hoan Tran <hotran@apm.com>
[groeck: Dropped unnecessary initialization]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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This patch supports xgene-hwmon v2 which uses the non-cachable memory
as the PCC shared memory.
Signed-off-by: Hoan Tran <hotran@apm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Commit 2ca492e22cb7 has moved the call to 'kfifo_alloc()' from after the
main 'if' statement to before it.
But it has not updated the error handling paths accordingly.
Fix all that:
- if 'kfifo_alloc()' fails we can return directly
- direct returns after 'kfifo_alloc()' must now go to 'out_mbox_free'
- 'goto out_mbox_free' must be replaced by 'goto out', otherwise the
'[pcc_]mbox_free_channel()' call will be missed.
Fixes: 2ca492e22cb7 ("hwmon: (xgene) Fix crash when alarm occurs before driver probe")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The newly added hwmon driver fails to build in an allmodconfig
kernel:
ERROR: "memblock_is_memory" [drivers/hwmon/xgene-hwmon.ko] undefined!
According to comments in the code, the mailbox is a shared memory region,
not a set of MMIO registers, so we should use memremap() for mapping it
instead of ioremap or acpi_os_ioremap, and pointer dereferences instead
of readl/writel.
The driver already uses plain kernel pointers, so it's a bit unusual
to work with functions that operate on __iomem pointers, and this
fixes that part too.
I'm using READ_ONCE/WRITE_ONCE here to keep the existing behavior
regarding the ordering of the accesses from the CPU, but note that
there are no barriers (also unchanged from before).
I'm also keeping the endianness behavior, though I'm unsure whether
the message data was supposed to be in LE32 format in the first
place, it's possible this was meant to be interpreted as a byte
stream instead.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Hoan Tran <hotran@apm.com>
Tested-by: Hoan Tran <hotran@apm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The system crashes during probing xgene-hwmon driver when temperature
alarm interrupt occurs before.
It's because
- xgene_hwmon_probe() requests mailbox channel which also enables
the mailbox interrupt.
- As temperature alarm interrupt is pending, ISR runs and crashes when
accesses into invalid resourse as unmapped PCC shared memory.
This patch fixes this issue by saving this alarm message and scheduling a
bottom handler after xgene_hwmon_probe() finish.
Signed-off-by: Hoan Tran <hotran@apm.com>
Reported-by: Itaru Kitayama <itaru.kitayama@riken.jp>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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This patch adds hardware temperature and power reading support for
APM X-Gene SoC using the mailbox communication interface.
Signed-off-by: Hoan Tran <hotran@apm.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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