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powerpc/microwatt: Remove unused early debug code

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The original microwatt submission[1] included some early debug code for
using the Microwatt "potato" UART.

The series that was eventually merged switched to using a standard UART,
and so doesn't need any special early debug handling. But some of the
original code was merged accidentally under the non-existent
CONFIG_PPC_EARLY_DEBUG_MICROWATT.

Drop the unused code.

1: https://lore.kernel.org/linuxppc-dev/20200509050340.GD1464954@thinks.paulus.ozlabs.org/

Fixes: 48b545b801 ("powerpc/microwatt: Use standard 16550 UART for console")
Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220919052755.800907-1-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2022-09-19 15:27:55 +10:00
parent e74611aa91
commit 456c300510
1 changed files with 0 additions and 39 deletions
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39
arch/powerpc/kernel/udbg_16550.c
View file

@ -296,42 +296,3 @@ void __init udbg_init_40x_realmode(void)
}
#endif /* CONFIG_PPC_EARLY_DEBUG_40x */
#ifdef CONFIG_PPC_EARLY_DEBUG_MICROWATT
#define UDBG_UART_MW_ADDR ((void __iomem *)0xc0002000)
static u8 udbg_uart_in_isa300_rm(unsigned int reg)
{
uint64_t msr = mfmsr();
uint8_t c;
mtmsr(msr & ~(MSR_EE|MSR_DR));
isync();
eieio();
c = __raw_rm_readb(UDBG_UART_MW_ADDR + (reg << 2));
mtmsr(msr);
isync();
return c;
}
static void udbg_uart_out_isa300_rm(unsigned int reg, u8 val)
{
uint64_t msr = mfmsr();
mtmsr(msr & ~(MSR_EE|MSR_DR));
isync();
eieio();
__raw_rm_writeb(val, UDBG_UART_MW_ADDR + (reg << 2));
mtmsr(msr);
isync();
}
void __init udbg_init_debug_microwatt(void)
{
udbg_uart_in = udbg_uart_in_isa300_rm;
udbg_uart_out = udbg_uart_out_isa300_rm;
udbg_use_uart();
}
#endif /* CONFIG_PPC_EARLY_DEBUG_MICROWATT */