[PATCH v3 02/24] drivers/video/fbdev: use ioremap_wc/wt() instead of __ioremap()

Christophe Leroy
2018-10-09T13:54:20Z

_PAGE_NO_CACHE is a platform specific flag. In addition, this flag
is misleading because one would think it requests a noncached page
whereas a noncached page is _PAGE_NO_CACHE | _PAGE_GUARDED

_PAGE_NO_CACHE alone means write combined noncached page, so lets
use ioremap_wc() instead.

_PAGE_WRITETHRU is also platform specific flag. Use ioremap_wt()
instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
drivers/video/fbdev/chipsfb.c | 3 +--
drivers/video/fbdev/controlfb.c | 5 +----
drivers/video/fbdev/platinumfb.c | 5 +----
drivers/video/fbdev/valkyriefb.c | 12 ++++++------
4 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/video/fbdev/chipsfb.c b/drivers/video/fbdev/chipsfb.c
index f103665cad43..40182ed85648 100644
--- a/drivers/video/fbdev/chipsfb.c
+++ b/drivers/video/fbdev/chipsfb.c
@@ -27,7 +27,6 @@
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/console.h>
-#include <asm/io.h>

#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
@@ -401,7 +400,7 @@ static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
#endif /* CONFIG_PMAC_BACKLIGHT */

#ifdef CONFIG_PPC
- p->screen_base = __ioremap(addr, 0x200000, _PAGE_NO_CACHE);
+ p->screen_base = ioremap_wc(addr, 0x200000);
#else
p->screen_base = ioremap(addr, 0x200000);
#endif
diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
index 8d14b29aafea..9cb0ef7ac29e 100644
--- a/drivers/video/fbdev/controlfb.c
+++ b/drivers/video/fbdev/controlfb.c
@@ -48,9 +48,7 @@
#include <linux/nvram.h>
#include <linux/adb.h>
#include <linux/cuda.h>
-#include <asm/io.h>
#include <asm/prom.h>
-#include <asm/pgtable.h>
#include <asm/btext.h>

#include "macmodes.h"
@@ -715,8 +713,7 @@ static int __init control_of_init(struct device_node *dp)
goto error_out;
}
/* map at most 8MB for the frame buffer */
- p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
- _PAGE_WRITETHRU);
+ p->frame_buffer = ioremap_wt(p->frame_buffer_phys, 0x800000);

if (!p->control_regs_phys ||
!request_mem_region(p->control_regs_phys, p->control_regs_size,
diff --git a/drivers/video/fbdev/platinumfb.c b/drivers/video/fbdev/platinumfb.c
index 377d3399a3ad..bf6b7fb83cf4 100644
--- a/drivers/video/fbdev/platinumfb.c
+++ b/drivers/video/fbdev/platinumfb.c
@@ -32,9 +32,7 @@
#include <linux/nvram.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
-#include <asm/io.h>
#include <asm/prom.h>
-#include <asm/pgtable.h>

#include "macmodes.h"
#include "platinumfb.h"
@@ -577,8 +575,7 @@ static int platinumfb_probe(struct platform_device* odev)

/* frame buffer - map only 4MB */
pinfo->frame_buffer_phys = pinfo->rsrc_fb.start;
- pinfo->frame_buffer = __ioremap(pinfo->rsrc_fb.start, 0x400000,
- _PAGE_WRITETHRU);
+ pinfo->frame_buffer = ioremap_wt(pinfo->rsrc_fb.start, 0x400000);
pinfo->base_frame_buffer = pinfo->frame_buffer;

/* registers */
diff --git a/drivers/video/fbdev/valkyriefb.c b/drivers/video/fbdev/valkyriefb.c
index 275fb98236d3..d51c3a8009cb 100644
--- a/drivers/video/fbdev/valkyriefb.c
+++ b/drivers/video/fbdev/valkyriefb.c
@@ -54,13 +54,11 @@
#include <linux/nvram.h>
#include <linux/adb.h>
#include <linux/cuda.h>
-#include <asm/io.h>
#ifdef CONFIG_MAC
#include <asm/macintosh.h>
#else
#include <asm/prom.h>
#endif
-#include <asm/pgtable.h>

#include "macmodes.h"
#include "valkyriefb.h"
@@ -318,7 +316,7 @@ static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
int __init valkyriefb_init(void)
{
struct fb_info_valkyrie *p;
- unsigned long frame_buffer_phys, cmap_regs_phys, flags;
+ unsigned long frame_buffer_phys, cmap_regs_phys;
int err;
char *option = NULL;

@@ -337,7 +335,6 @@ int __init valkyriefb_init(void)
/* Hardcoded addresses... welcome to 68k Macintosh country :-) */
frame_buffer_phys = 0xf9000000;
cmap_regs_phys = 0x50f24000;
- flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
#else /* ppc (!CONFIG_MAC) */
{
struct device_node *dp;
@@ -354,7 +351,6 @@ int __init valkyriefb_init(void)

frame_buffer_phys = r.start;
cmap_regs_phys = r.start + 0x304000;
- flags = _PAGE_WRITETHRU;
}
#endif /* ppc (!CONFIG_MAC) */

@@ -369,7 +365,11 @@ int __init valkyriefb_init(void)
}
p->total_vram = 0x100000;
p->frame_buffer_phys = frame_buffer_phys;
- p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
+#ifdef CONFIG_MAC
+ p->frame_buffer = ioremap_nocache(frame_buffer_phys, p->total_vram);
+#else
+ p->frame_buffer = ioremap_wt(frame_buffer_phys, p->total_vram);
+#endif
p->cmap_regs_phys = cmap_regs_phys;
p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
--
2.13.3