[RFC PATCH 2/2] lib: utils/timer: Add a separate compatible for the D1 CLINT
Guo Ren
guoren at kernel.org
Tue Oct 19 20:10:41 PDT 2021
On Wed, Oct 20, 2021 at 9:58 AM Samuel Holland <samuel at sholland.org> wrote:
>
> The CLINT in the Allwinner D1 SoC apparently does not support 64-bit
> MMIO access. A property was added to support this quirk (and that
> property was copied to the ACLINT MTIMER code). However, since this
> difference in behavior makes the D1 CLINT incompatible with the SiFive
> CLINT's programming interface, a better solution is to use a separate
> compatible string.
>
> Signed-off-by: Samuel Holland <samuel at sholland.org>
> ---
> docs/platform/thead-c9xx.md | 4 +--
> lib/utils/ipi/fdt_ipi_mswi.c | 1 +
> lib/utils/timer/fdt_timer_mtimer.c | 39 +++++++++++++++++++-----------
> 3 files changed, 27 insertions(+), 17 deletions(-)
>
> diff --git a/docs/platform/thead-c9xx.md b/docs/platform/thead-c9xx.md
> index 3490ed5..ced784d 100644
> --- a/docs/platform/thead-c9xx.md
> +++ b/docs/platform/thead-c9xx.md
> @@ -52,12 +52,11 @@ DTS Example1: (Single core, eg: Allwinner D1 - c906)
> ranges;
>
> clint0: clint at 14000000 {
> - compatible = "riscv,clint0";
> + compatible = "allwinner,sun20i-d1-clint";
> interrupts-extended = <
> &cpu0_intc 3 &cpu0_intc 7
> >;
> reg = <0x0 0x14000000 0x0 0x04000000>;
> - clint,has-no-64bit-mmio;
> };
>
> intc: interrupt-controller at 10000000 {
> @@ -163,7 +162,6 @@ DTS Example2: (Multi cores with soc reset-regs)
> &cpu4_intc 3 &cpu4_intc 7
> >;
> reg = <0xff 0xdc000000 0x0 0x04000000>;
> - clint,has-no-64bit-mmio;
Could we still keep clint,has-no-64bit-mmio for compatible? It has
been widely used in our customers' dts.
> };
>
> intc: interrupt-controller at ffd8000000 {
> diff --git a/lib/utils/ipi/fdt_ipi_mswi.c b/lib/utils/ipi/fdt_ipi_mswi.c
> index 0176941..af69e16 100644
> --- a/lib/utils/ipi/fdt_ipi_mswi.c
> +++ b/lib/utils/ipi/fdt_ipi_mswi.c
> @@ -54,6 +54,7 @@ static int ipi_mswi_cold_init(void *fdt, int nodeoff,
> static const unsigned long clint_offset = CLINT_MSWI_OFFSET;
>
> static const struct fdt_match ipi_mswi_match[] = {
> + { .compatible = "allwinner,sun20i-d1-clint", .data = &clint_offset },
> { .compatible = "riscv,clint0", .data = &clint_offset },
> { .compatible = "sifive,clint0", .data = &clint_offset },
> { .compatible = "riscv,aclint-mswi" },
> diff --git a/lib/utils/timer/fdt_timer_mtimer.c b/lib/utils/timer/fdt_timer_mtimer.c
> index 1ad8508..e140567 100644
> --- a/lib/utils/timer/fdt_timer_mtimer.c
> +++ b/lib/utils/timer/fdt_timer_mtimer.c
> @@ -15,6 +15,11 @@
>
> #define MTIMER_MAX_NR 16
>
> +struct timer_mtimer_quirks {
> + unsigned int mtime_offset;
> + bool has_64bit_mmio;
> +};
> +
> static unsigned long mtimer_count = 0;
> static struct aclint_mtimer_data mtimer[MTIMER_MAX_NR];
> static struct aclint_mtimer_data *mt_reference = NULL;
> @@ -23,7 +28,7 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
> const struct fdt_match *match)
> {
> int i, rc;
> - unsigned long offset, addr[2], size[2];
> + unsigned long addr[2], size[2];
> struct aclint_mtimer_data *mt;
>
> if (MTIMER_MAX_NR <= mtimer_count)
> @@ -43,28 +48,25 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
> return rc;
>
> if (match->data) { /* SiFive CLINT */
> + const struct timer_mtimer_quirks *quirks = match->data;
> +
> /* Set CLINT addresses */
> mt->mtimecmp_addr = addr[0] + ACLINT_DEFAULT_MTIMECMP_OFFSET;
> mt->mtimecmp_size = ACLINT_DEFAULT_MTIMECMP_SIZE;
> mt->mtime_addr = addr[0] + ACLINT_DEFAULT_MTIME_OFFSET;
> mt->mtime_size = size[0] - mt->mtimecmp_size;
> /* Adjust MTIMER address and size for CLINT device */
> - offset = *((unsigned long *)match->data);
> - mt->mtime_addr += offset;
> - mt->mtimecmp_addr += offset;
> - mt->mtime_size -= offset;
> - /* Parse additional CLINT properties */
> - if (fdt_getprop(fdt, nodeoff, "clint,has-no-64bit-mmio", &rc))
> - mt->has_64bit_mmio = false;
> + mt->mtime_addr += quirks->mtime_offset;
> + mt->mtimecmp_addr += quirks->mtime_offset;
> + mt->mtime_size -= quirks->mtime_offset;
> + /* Apply additional CLINT quirks */
> + mt->has_64bit_mmio = quirks->has_64bit_mmio;
> } else { /* RISC-V ACLINT MTIMER */
> /* Set ACLINT MTIMER addresses */
> mt->mtime_addr = addr[0];
> mt->mtime_size = size[0];
> mt->mtimecmp_addr = addr[1];
> mt->mtimecmp_size = size[1];
> - /* Parse additional ACLINT MTIMER properties */
> - if (fdt_getprop(fdt, nodeoff, "mtimer,no-64bit-mmio", &rc))
> - mt->has_64bit_mmio = false;
Dito.
> }
>
> /* Check if MTIMER device has shared MTIME address */
> @@ -107,11 +109,20 @@ static int timer_mtimer_cold_init(void *fdt, int nodeoff,
> return 0;
> }
>
> -static unsigned long clint_offset = CLINT_MTIMER_OFFSET;
> +static const struct timer_mtimer_quirks d1_clint_quirks = {
> + .mtime_offset = CLINT_MTIMER_OFFSET,
> + .has_64bit_mmio = false,
> +};
> +
> +static const struct timer_mtimer_quirks sifive_clint_quirks = {
> + .mtime_offset = CLINT_MTIMER_OFFSET,
> + .has_64bit_mmio = true,
> +};
>
> static const struct fdt_match timer_mtimer_match[] = {
> - { .compatible = "riscv,clint0", .data = &clint_offset },
> - { .compatible = "sifive,clint0", .data = &clint_offset },
> + { .compatible = "allwinner,sun20i-d1-clint", .data = &d1_clint_quirks },
> + { .compatible = "riscv,clint0", .data = &sifive_clint_quirks },
> + { .compatible = "sifive,clint0", .data = &sifive_clint_quirks },
> { .compatible = "riscv,aclint-mtimer" },
> { },
> };
> --
> 2.32.0
>
--
Best Regards
Guo Ren
ML: https://lore.kernel.org/linux-csky/
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