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hw/arm/exynos: Fix Linux kernel division by zero for PLLs

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Without any clock controller, the Linux kernel was hitting division by
zero during boot or with clk_summary:
[    0.000000] [<c031054c>] (unwind_backtrace) from [<c030ba6c>] (show_stack+0x10/0x14)
[    0.000000] [<c030ba6c>] (show_stack) from [<c05b2660>] (dump_stack+0x88/0x9c)
[    0.000000] [<c05b2660>] (dump_stack) from [<c05b11a4>] (Ldiv0+0x8/0x10)
[    0.000000] [<c05b11a4>] (Ldiv0) from [<c06ad1e0>] (samsung_pll45xx_recalc_rate+0x58/0x74)
[    0.000000] [<c06ad1e0>] (samsung_pll45xx_recalc_rate) from [<c0692ec0>] (clk_register+0x39c/0x63c)
[    0.000000] [<c0692ec0>] (clk_register) from [<c125d360>] (samsung_clk_register_pll+0x2e0/0x3d4)
[    0.000000] [<c125d360>] (samsung_clk_register_pll) from [<c125d7e8>] (exynos4_clk_init+0x1b0/0x5e4)
[    0.000000] [<c125d7e8>] (exynos4_clk_init) from [<c12335f4>] (of_clk_init+0x17c/0x210)
[    0.000000] [<c12335f4>] (of_clk_init) from [<c1204700>] (time_init+0x24/0x2c)
[    0.000000] [<c1204700>] (time_init) from [<c1200b2c>] (start_kernel+0x24c/0x38c)
[    0.000000] [<c1200b2c>] (start_kernel) from [<4020807c>] (0x4020807c)

Provide stub for clock controller returning reset values for PLLs.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Message-id: 20170226200142.31169-1-krzk@kernel.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Krzysztof Kozlowski 2017-02-28 12:08:20 +00:00 • committed by Peter Maydell
parent 43ddc182e2
commit 1e0228fd20
3 changed files with 171 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
hw/arm/exynos4210.c
View file

@ -24,6 +24,7 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "qemu/log.h"
#include "cpu.h"
#include "hw/boards.h"
#include "sysemu/sysemu.h"
@ -74,6 +75,9 @@
/* PMU SFR base address */
#define EXYNOS4210_PMU_BASE_ADDR 0x10020000
/* Clock controller SFR base address */
#define EXYNOS4210_CLK_BASE_ADDR 0x10030000
/* Display controllers (FIMD) */
#define EXYNOS4210_FIMD0_BASE_ADDR 0x11C00000
@ -297,6 +301,8 @@ Exynos4210State *exynos4210_init(MemoryRegion *system_mem,
*/
sysbus_create_simple("exynos4210.pmu", EXYNOS4210_PMU_BASE_ADDR, NULL);
sysbus_create_simple("exynos4210.clk", EXYNOS4210_CLK_BASE_ADDR, NULL);
/* PWM */
sysbus_create_varargs("exynos4210.pwm", EXYNOS4210_PWM_BASE_ADDR,
s->irq_table[exynos4210_get_irq(22, 0)],