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ARCv2: IOC: use @ioc_enable not @ioc_exist where intended

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if user disables IOC from debugger at startup (by clearing @ioc_enable),
@ioc_exists is cleared too. This means boot prints don't capture the
fact that IOC was present but disabled which could be misleading.

So invert how we use @ioc_enable and @ioc_exists and make it more
canonical. @ioc_exists represent whether hardware is present or not and
stays same whether enabled or not. @ioc_enable is still user driven,
but will be auto-disabled if IOC hardware is not present, i.e. if
@ioc_exist=0. This is opposite to what we were doing before, but much
clearer.

This means @ioc_enable is now the "exported" toggle in rest of code such
as dma mapping API.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2016-10-13 15:58:59 -07:00
parent 91e040a79d
commit cf986d4702
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arc/include/asm/cache.h
View File

@ -53,7 +53,7 @@ extern void arc_cache_init(void);
extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
extern void read_decode_cache_bcr(void);
extern int ioc_exists;
extern int ioc_enable;
extern unsigned long perip_base, perip_end;
#endif /* !__ASSEMBLY__ */

10
arch/arc/mm/cache.c
View File

@ -22,8 +22,8 @@
#include <asm/setup.h>
static int l2_line_sz;
int ioc_exists;
volatile int slc_enable = 1, ioc_enable = 1;
static int ioc_exists;
int slc_enable = 1, ioc_enable = 1;
unsigned long perip_base = ARC_UNCACHED_ADDR_SPACE; /* legacy value for boot */
unsigned long perip_end = 0xFFFFFFFF; /* legacy value */
@ -113,8 +113,10 @@ static void read_decode_cache_bcr_arcv2(int cpu)
}
READ_BCR(ARC_REG_CLUSTER_BCR, cbcr);
if (cbcr.c && ioc_enable)
if (cbcr.c)
ioc_exists = 1;
else
ioc_enable = 0;
/* HS 2.0 didn't have AUX_VOL */
if (cpuinfo_arc700[cpu].core.family > 0x51) {
@ -1002,7 +1004,7 @@ void arc_cache_init(void)
read_aux_reg(ARC_REG_SLC_CTRL) | SLC_CTRL_DISABLE);
}
if (is_isa_arcv2() && ioc_exists) {
if (is_isa_arcv2() && ioc_enable) {
/* IO coherency base - 0x8z */
write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000);
/* IO coherency aperture size - 512Mb: 0x8z-0xAz */

4
arch/arc/mm/dma.c
View File

@ -45,7 +45,7 @@ static void *arc_dma_alloc(struct device *dev, size_t size,
* -For coherent data, Read/Write to buffers terminate early in cache
* (vs. always going to memory - thus are faster)
*/
if ((is_isa_arcv2() && ioc_exists) ||
if ((is_isa_arcv2() && ioc_enable) ||
(attrs & DMA_ATTR_NON_CONSISTENT))
need_coh = 0;
@ -97,7 +97,7 @@ static void arc_dma_free(struct device *dev, size_t size, void *vaddr,
int is_non_coh = 1;
is_non_coh = (attrs & DMA_ATTR_NON_CONSISTENT) ||
(is_isa_arcv2() && ioc_exists);
(is_isa_arcv2() && ioc_enable);
if (PageHighMem(page) || !is_non_coh)
iounmap((void __force __iomem *)vaddr);