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drm/ast: Use constants for WDT registers

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WDT is the Watchdog timer. WDC registers are located at the memory
range at [0x1e785000, 0x1e785fff]. There are currently up to 8
watchdog timers in the range, of which 2 are being used by AST2500.

Refer to them with macros named AST_REG_WDT<n>, where <n> is the byte
offset into the watchdog timer's memory range. Each macro also takes
the index of the watchdog timer to access. A new watchdog timer starts
at each 0x40 byte offset.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patch.msgid.link/20260327133532.79696-8-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2026-03-27 14:32:59 +01:00
parent f9f57e03d2
commit a0320ef5a9
2 changed files with 23 additions and 10 deletions
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20
drivers/gpu/drm/ast/ast_2500.c
View File

@ -127,9 +127,9 @@ void ast_2500_patch_ahb(void __iomem *regs)
* [1]:= 1:WDT will be cleeared and disabled after timeout occurs
* [0]:= 1:WDT enable
*/
__ast_moutdwm(regs, 0x1E785004, 0x00000010);
__ast_moutdwm(regs, 0x1E785008, 0x00004755);
__ast_moutdwm(regs, 0x1E78500c, 0x00000033);
__ast_moutdwm(regs, AST_REG_WDT04(0), 0x00000010);
__ast_moutdwm(regs, AST_REG_WDT08(0), 0x00004755);
__ast_moutdwm(regs, AST_REG_WDT0C(0), 0x00000033);
udelay(1000);
}
@ -304,12 +304,12 @@ static void set_mpll_2500(struct ast_device *ast)
static void reset_mmc_2500(struct ast_device *ast)
{
ast_moutdwm(ast, 0x1E78505C, 0x00000004);
ast_moutdwm(ast, 0x1E785044, 0x00000001);
ast_moutdwm(ast, 0x1E785048, 0x00004755);
ast_moutdwm(ast, 0x1E78504C, 0x00000013);
ast_moutdwm(ast, AST_REG_WDT1C(1), 0x00000004);
ast_moutdwm(ast, AST_REG_WDT04(1), 0x00000001);
ast_moutdwm(ast, AST_REG_WDT08(1), 0x00004755);
ast_moutdwm(ast, AST_REG_WDT0C(1), 0x00000013);
mdelay(100);
ast_moutdwm(ast, 0x1E785054, 0x00000077);
ast_moutdwm(ast, AST_REG_WDT14(1), 0x00000077);
ast_moutdwm(ast, AST_REG_MCR00, AST_REG_MCR00_PROTECTION_KEY);
}
@ -508,8 +508,8 @@ static void ast_post_chip_2500(struct ast_device *ast)
ast_2500_patch_ahb(ast->regs);
/* Disable watchdog */
ast_moutdwm(ast, 0x1E78502C, 0x00000000);
ast_moutdwm(ast, 0x1E78504C, 0x00000000);
ast_moutdwm(ast, AST_REG_WDT2C(0), 0x00000000);
ast_moutdwm(ast, AST_REG_WDT0C(1), 0x00000000);
/*
* Reset USB port to patch USB unknown device issue

13
drivers/gpu/drm/ast/ast_reg.h
View File

@ -196,4 +196,17 @@
#define AST_REG_A2P(__offset) (AST_REG_A2P_BASE + (__offset))
#define AST_REG_A2P58 AST_REG_A2P(0x58)
/*
* Watchdog timer (0x1e785000 - 0x1e785fff)
*/
#define AST_REG_WDT_BASE(__n) (0x1e785000 + (__n) * 0x40)
#define AST_REG_WDT(__n, __offset) (AST_REG_WDT_BASE((__n)) + (__offset))
#define AST_REG_WDT04(__n) AST_REG_WDT((__n), 0x04)
#define AST_REG_WDT08(__n) AST_REG_WDT((__n), 0x08)
#define AST_REG_WDT0C(__n) AST_REG_WDT((__n), 0x0c)
#define AST_REG_WDT14(__n) AST_REG_WDT((__n), 0x14)
#define AST_REG_WDT1C(__n) AST_REG_WDT((__n), 0x1c)
#define AST_REG_WDT2C(__n) AST_REG_WDT((__n), 0x2c)
#endif