On Thu, May 08 2014 at 1:01:50 am BST, Feng Kan <[email protected]> wrote:
> This change is made to preserve the GIC v2 bypass bits in the
> GIC_CPU_CTRL register (also known as the GICC_CTLR register in spec).
> This code will preserve all bits configured by the bootload regarding
> v2 bypass group bits. In the X-Gene platform, the bypass functionality
> is not used and bypass bits should not be changed by the kernel gic
> code as it could lead to incorrect behavior.
>
> Signed-off-by: Vinayak Kale <[email protected]>
> Acked-by: Anup Patel <[email protected]>
> Signed-off-by: Feng Kan <[email protected]>
> ---
> V5: Use macro to replace read modify write of cpu_ctrl register.
> V4: Change to use bypass mask, change ot user more suitable variable name.
> drivers/irqchip/irq-gic.c | 16 +++++++++++++---
> 1 files changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 4300b66..42e9bf4 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -97,6 +97,13 @@ struct irq_chip gic_arch_extn = {
> #define MAX_GIC_NR 1
> #endif
>
> +#define set_cpuctrl(base, val) \
> + do { \
> + u32 bypass; \
> + bypass = readl(base + GIC_CPU_CTRL) & 0x1e0; \
> + writel_relaxed(bypass | val, base + GIC_CPU_CTRL);\
> + } while (0)
> +
Please use a function. A macro doesn't buy us anything here, and lacks
type safety.
Your previous patch was nicer in that respect. You just had to move the
enable code to a gic_cpu_if_up() function, and you were done...
> static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
>
> #ifdef CONFIG_GIC_NON_BANKED
> @@ -449,13 +456,15 @@ static void gic_cpu_init(struct gic_chip_data *gic)
> writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4 /
> 4);
>
> writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
> - writel_relaxed(1, base + GIC_CPU_CTRL);
> +
> + set_cpuctrl(base, 1);
> }
>
> void gic_cpu_if_down(void)
> {
> void __iomem *cpu_base = gic_data_cpu_base(&gic_data[0]);
> - writel_relaxed(0, cpu_base + GIC_CPU_CTRL);
> +
> + set_cpuctrl(cpu_base, 0);
> }
>
> #ifdef CONFIG_CPU_PM
> @@ -590,7 +599,8 @@ static void gic_cpu_restore(unsigned int gic_nr)
> writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4);
>
> writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK);
> - writel_relaxed(1, cpu_base + GIC_CPU_CTRL);
> +
> + set_cpuctrl(cpu_base, 1);
> }
>
> static int gic_notifier(struct notifier_block *self, unsigned long cmd,
> void *v)
M.
--
Jazz is not dead. It just smells funny.
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