watchdog: sbsa: use 32-bit read for WCV
According to SBSA spec v3.1 section 5.3: All registers are 32 bits in size and should be accessed using 32-bit reads and writes. If an access size other than 32 bits is used then the results are IMPLEMENTATION DEFINED. [...] The Generic Watchdog is little-endian The current code uses readq to read the watchdog compare register which does a 64-bit access. This fails on ThunderX2 which does not implement 64-bit access to this register. Fix this by using lo_hi_readq() that does two 32-bit reads. Signed-off-by: Jayachandran C <jnair@caviumnetworks.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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@ -50,6 +50,7 @@
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*/
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#include <linux/io.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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@ -159,7 +160,7 @@ static unsigned int sbsa_gwdt_get_timeleft(struct watchdog_device *wdd)
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!(readl(gwdt->control_base + SBSA_GWDT_WCS) & SBSA_GWDT_WCS_WS0))
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timeleft += readl(gwdt->control_base + SBSA_GWDT_WOR);
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timeleft += readq(gwdt->control_base + SBSA_GWDT_WCV) -
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timeleft += lo_hi_readq(gwdt->control_base + SBSA_GWDT_WCV) -
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arch_counter_get_cntvct();
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do_div(timeleft, gwdt->clk);
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