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Rename try_msr_calibrate_tsc() to cpu_mhz_from_msr(), as that
better describes what the routine does.
This keeps in sync with Linux kernel commit:
02c0cd2: x86/tsc_msr: Remove irqoff around MSR-based TSC enumeration
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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Atom processors use a 19.2 MHz crystal oscillator.
Early processors generate 100 MHz via 19.2 MHz * 26 / 5 = 99.84 MHz.
Later processors generate 100 MHz via 19.2 MHz * 125 / 24 = 100 MHz.
Update the Silvermont-based tables accordingly, matching the Software
Developers Manual.
Also, correct a 166 MHz entry that should have been 116 MHz, and add
a missing 80 MHz entry for VLV2.
This keeps in sync with Linux kernel commit:
05680e7: x86/tsc_msr: Correct Silvermont reference clock values
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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Some processor abbreviations in the comments of freq_desc_tables[]
are obscure. This updates part of these to mention processors
that are known to us. Also expand frequency definitions.
This keeps in sync with Linux kernel commit:
9e0cae9: x86/tsc_msr: Update comments, expand definitions
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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If either ratio or freq is zero, the return value is zero. There
is no need to create a fail branch and return zero there.
This keeps in sync with Linux kernel commit:
14bb4e3: x86/tsc_msr: Remove debugging messages
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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try_msr_calibrate_tsc() is currently Intel-specific, and should not
execute on any other vendor's parts.
This keeps in sync with Linux kernel commit:
ba82683: x86/tsc_msr: Identify Intel-specific code
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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Currently we read the tsc radio like this:
ratio = (MSR_PLATFORM_INFO >> 8) & 0x1f;
Thus we get bit 8-12 of MSR_PLATFORM_INFO, however according to the
Intel manual, the ratio bits are bit 8-15.
Fix this problem by masking 0xff instead.
This keeps in sync with Linux kernel commit:
886123f: x86/tsc: Read all ratio bits from MSR_PLATFORM_INFO
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
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Right now i8254_init() is called from timer_init() in the tsc timer
driver. But actually i8254 and tsc are completely different things.
Since tsc timer has been converted to driver model, we should find
a new place that is appropriate for U-Boot to call i8254_init(),
which is now x86_cpu_init_f().
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
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To group all dm timer drivers together, move tsc timer to
drivers/timer directory.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
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