[U-Boot] [PATCH 3/9] riscv: Add a SYSCON driver for Andestech's PLMT

[Rick Chen]

Hi Bin

Bin Meng <bmeng.cn at gmail.com> 於 2019年3月20日 週三 下午3:22寫道：
>
> Hi Rick,
>
> On Tue, Mar 19, 2019 at 5:12 PM Andes <uboot at andestech.com> wrote:
> >
> > From: Rick Chen <rick at andestech.com>
> >
> > The platform-Level Machine Timer(PLMT) block
> > holds memory-mapped mtime register associated
> > with timer tick.
> >
> > This driver implements the riscv_get_time()which
>
> nits: need one space before "which"

OK

>
> > are required by the generic RISC-V timer driver.
>
> are -> is

OK

>
> >
> > Signed-off-by: Rick Chen <rick at andestech.com>
> > Cc: Greentime Hu <greentime at andestech.com>
> > ---
> >  arch/riscv/Kconfig                   |  9 ++++++
> >  arch/riscv/include/asm/global_data.h |  3 ++
> >  arch/riscv/include/asm/syscon.h      |  1 +
> >  arch/riscv/lib/Makefile              |  1 +
> >  arch/riscv/lib/nds_plmt.c            | 53 ++++++++++++++++++++++++++++++++++++
> >  5 files changed, 67 insertions(+)
> >  create mode 100644 arch/riscv/lib/nds_plmt.c
> >
> > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> > index fef11dd..697892e 100644
> > --- a/arch/riscv/Kconfig
> > +++ b/arch/riscv/Kconfig
> > @@ -118,6 +118,15 @@ config NDS_PLIC
> >           The Andes PLIC block holds memory-mapped claim and pending registers
> >           associated with software interrupt.
> >
> > +config NDS_PLMT
>
> ANDES_PLMT?

OK

>
> > +       bool
> > +       depends on RISCV_MMODE
> > +       select REGMAP
> > +       select SYSCON
> > +       help
> > +         The Andes PLMT block holds memory-mapped mtime register
> > +         associated with timer tick.
> > +
> >  config RISCV_RDTIME
> >         bool
> >         default y if RISCV_SMODE
> > diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h
> > index 15867f5..0695ae3 100644
> > --- a/arch/riscv/include/asm/global_data.h
> > +++ b/arch/riscv/include/asm/global_data.h
> > @@ -21,6 +21,9 @@ struct arch_global_data {
> >  #ifdef CONFIG_NDS_PLIC
> >         void __iomem *plic;     /* plic base address */
> >  #endif
> > +#ifdef CONFIG_NDS_PLMT
> > +       void __iomem *plmt;     /* plmt base address */
> > +#endif
> >  #ifdef CONFIG_SMP
> >         struct ipi_data ipi[CONFIG_NR_CPUS];
> >  #endif
> > diff --git a/arch/riscv/include/asm/syscon.h b/arch/riscv/include/asm/syscon.h
> > index 0229989..9fdee09 100644
> > --- a/arch/riscv/include/asm/syscon.h
> > +++ b/arch/riscv/include/asm/syscon.h
> > @@ -14,6 +14,7 @@ enum {
> >         RISCV_NONE,
> >         RISCV_SYSCON_CLINT,     /* Core Local Interruptor (CLINT) */
> >         RISCV_SYSCON_PLIC,      /* Platform Level Interrup Controller (PLIC) */
> > +       RISCV_SYSCON_PLMT,      /* Platform Level Machine Timer (PLMT) */
> >  };
> >
> >  #endif /* _ASM_SYSCON_H */
> > diff --git a/arch/riscv/lib/Makefile b/arch/riscv/lib/Makefile
> > index 8187c2b..383eed3 100644
> > --- a/arch/riscv/lib/Makefile
> > +++ b/arch/riscv/lib/Makefile
> > @@ -12,6 +12,7 @@ obj-y += cache.o
> >  obj-$(CONFIG_RISCV_RDTIME) += rdtime.o
> >  obj-$(CONFIG_SIFIVE_CLINT) += sifive_clint.o
> >  obj-$(CONFIG_NDS_PLIC) += nds_plic.o
> > +obj-$(CONFIG_NDS_PLMT) += nds_plmt.o
> >  obj-y  += interrupts.o
> >  obj-y  += reset.o
> >  obj-$(CONFIG_SBI_IPI) += sbi_ipi.o
> > diff --git a/arch/riscv/lib/nds_plmt.c b/arch/riscv/lib/nds_plmt.c
> > new file mode 100644
> > index 0000000..12d7e0e
> > --- /dev/null
> > +++ b/arch/riscv/lib/nds_plmt.c
> > @@ -0,0 +1,53 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (C) 2019, Rick Chen <rick at andestech.com>
> > + *
> > + * U-Boot syscon driver for Andes's Platform Level Machine Timer (PLMT).
> > + * The PLMT block holds memory-mapped mtime register
> > + * associated with timer tick.
> > + */
> > +
> > +#include <common.h>
> > +#include <dm.h>
> > +#include <regmap.h>
> > +#include <syscon.h>
> > +#include <asm/io.h>
> > +#include <asm/syscon.h>
> > +
> > +/* mtime register */
> > +#define MTIME_REG(base)                        ((ulong)(base))
> > +
> > +DECLARE_GLOBAL_DATA_PTR;
> > +
> > +#define PLMT_BASE_GET(void)                                            \
> > +       do {                                                            \
> > +               long *ret;                                              \
> > +                                                                       \
> > +               if (!gd->arch.plmt) {                                   \
> > +                       ret = syscon_get_first_range(RISCV_SYSCON_PLMT); \
> > +                       if (IS_ERR(ret))                                \
> > +                               return PTR_ERR(ret);                    \
> > +                       gd->arch.plmt = ret;                            \
> > +               }                                                       \
> > +       } while (0)
> > +
> > +int riscv_get_time(u64 *time)
> > +{
> > +       PLMT_BASE_GET();
> > +
> > +       *time = readq((void __iomem *)MTIME_REG(gd->arch.plmt));
> > +
> > +       return 0;
> > +}
> > +
> > +static const struct udevice_id nds_plmt_ids[] = {
> > +       { .compatible = "riscv,plmt0", .data = RISCV_SYSCON_PLMT },
> > +       { }
> > +};
> > +
> > +U_BOOT_DRIVER(nds_plmt) = {
> > +       .name           = "nds_plmt",
> > +       .id             = UCLASS_SYSCON,
> > +       .of_match       = nds_plmt_ids,
> > +       .flags          = DM_FLAG_PRE_RELOC,
> > +};
> > --
>
> Regards,
> Bin