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- fixes to get alchemy platform back in shape

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- fix for initrd detection
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Merge tag 'mips-fixes_6.4_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

Pull MIPS fixes from Thomas Bogendoerfer:

 - fixes to get alchemy platform back in shape

 - fix for initrd detection

* tag 'mips-fixes_6.4_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  mips: Move initrd_start check after initrd address sanitisation.
  MIPS: Alchemy: fix dbdma2
  MIPS: Restore Au1300 support
  MIPS: unhide PATA_PLATFORM
This commit is contained in:
Linus Torvalds 2023-05-28 07:08:52 -04:00
commit 045049cb38
4 changed files with 26 additions and 16 deletions
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1
arch/mips/Kconfig
View File

@ -79,6 +79,7 @@ config MIPS
select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
select HAVE_PATA_PLATFORM
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
select HAVE_PERF_USER_STACK_DUMP

27
arch/mips/alchemy/common/dbdma.c
View File

@ -30,6 +30,7 @@
*
*/
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
@ -623,17 +624,18 @@ u32 au1xxx_dbdma_put_source(u32 chanid, dma_addr_t buf, int nbytes, u32 flags)
dp->dscr_cmd0 &= ~DSCR_CMD0_IE;
/*
* There is an errata on the Au1200/Au1550 parts that could result
* in "stale" data being DMA'ed. It has to do with the snoop logic on
* the cache eviction buffer. DMA_NONCOHERENT is on by default for
* these parts. If it is fixed in the future, these dma_cache_inv will
* just be nothing more than empty macros. See io.h.
* There is an erratum on certain Au1200/Au1550 revisions that could
* result in "stale" data being DMA'ed. It has to do with the snoop
* logic on the cache eviction buffer. dma_default_coherent is set
* to false on these parts.
*/
dma_cache_wback_inv((unsigned long)buf, nbytes);
if (!dma_default_coherent)
dma_cache_wback_inv(KSEG0ADDR(buf), nbytes);
dp->dscr_cmd0 |= DSCR_CMD0_V; /* Let it rip */
wmb(); /* drain writebuffer */
dma_cache_wback_inv((unsigned long)dp, sizeof(*dp));
ctp->chan_ptr->ddma_dbell = 0;
wmb(); /* force doorbell write out to dma engine */
/* Get next descriptor pointer. */
ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
@ -685,17 +687,18 @@ u32 au1xxx_dbdma_put_dest(u32 chanid, dma_addr_t buf, int nbytes, u32 flags)
dp->dscr_source1, dp->dscr_dest0, dp->dscr_dest1);
#endif
/*
* There is an errata on the Au1200/Au1550 parts that could result in
* "stale" data being DMA'ed. It has to do with the snoop logic on the
* cache eviction buffer. DMA_NONCOHERENT is on by default for these
* parts. If it is fixed in the future, these dma_cache_inv will just
* be nothing more than empty macros. See io.h.
* There is an erratum on certain Au1200/Au1550 revisions that could
* result in "stale" data being DMA'ed. It has to do with the snoop
* logic on the cache eviction buffer. dma_default_coherent is set
* to false on these parts.
*/
dma_cache_inv((unsigned long)buf, nbytes);
if (!dma_default_coherent)
dma_cache_inv(KSEG0ADDR(buf), nbytes);
dp->dscr_cmd0 |= DSCR_CMD0_V; /* Let it rip */
wmb(); /* drain writebuffer */
dma_cache_wback_inv((unsigned long)dp, sizeof(*dp));
ctp->chan_ptr->ddma_dbell = 0;
wmb(); /* force doorbell write out to dma engine */
/* Get next descriptor pointer. */
ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));

5
arch/mips/kernel/cpu-probe.c
View File

@ -1502,6 +1502,10 @@ static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
break;
}
break;
case PRID_IMP_NETLOGIC_AU13XX:
c->cputype = CPU_ALCHEMY;
__cpu_name[cpu] = "Au1300";
break;
}
}
@ -1863,6 +1867,7 @@ void cpu_probe(void)
cpu_probe_mips(c, cpu);
break;
case PRID_COMP_ALCHEMY:
case PRID_COMP_NETLOGIC:
cpu_probe_alchemy(c, cpu);
break;
case PRID_COMP_SIBYTE:

9
arch/mips/kernel/setup.c
View File

@ -158,10 +158,6 @@ static unsigned long __init init_initrd(void)
pr_err("initrd start must be page aligned\n");
goto disable;
}
if (initrd_start < PAGE_OFFSET) {
pr_err("initrd start < PAGE_OFFSET\n");
goto disable;
}
/*
* Sanitize initrd addresses. For example firmware
@ -174,6 +170,11 @@ static unsigned long __init init_initrd(void)
initrd_end = (unsigned long)__va(end);
initrd_start = (unsigned long)__va(__pa(initrd_start));
if (initrd_start < PAGE_OFFSET) {
pr_err("initrd start < PAGE_OFFSET\n");
goto disable;
}
ROOT_DEV = Root_RAM0;
return PFN_UP(end);
disable: