On Wed, Jul 28, 2021 at 12:29 PM Sean Anderson <sean...@gmail.com> wrote:
>
> On 7/27/21 4:54 AM, Zong Li wrote:
> > Invokes the generic cache_enable interface to execute the relative
> > implementation in SiFive ccache driver.
> >
> > Signed-off-by: Zong Li <zong...@sifive.com>
> > ---
> > arch/riscv/cpu/fu540/Kconfig | 1 +
> > arch/riscv/cpu/fu540/cache.c | 62 ++++++++---------------
> > arch/riscv/cpu/fu740/Kconfig | 1 +
> > arch/riscv/cpu/fu740/cache.c | 60 +++++++---------------
> > arch/riscv/include/asm/arch-fu540/cache.h | 2 +-
> > arch/riscv/include/asm/arch-fu740/cache.h | 2 +-
> > board/sifive/unleashed/unleashed.c | 10 +---
> > board/sifive/unmatched/unmatched.c | 9 +---
> > 8 files changed, 45 insertions(+), 102 deletions(-)
> >
> > diff --git a/arch/riscv/cpu/fu540/Kconfig b/arch/riscv/cpu/fu540/Kconfig
> > index 05463b2625..1f50b823ed 100644
> > --- a/arch/riscv/cpu/fu540/Kconfig
> > +++ b/arch/riscv/cpu/fu540/Kconfig
> > @@ -19,6 +19,7 @@ config SIFIVE_FU540
> > imply SMP
> > imply CLK_SIFIVE
> > imply CLK_SIFIVE_PRCI
> > + imply SIFIVE_CACHE_CCACHE
> > imply SIFIVE_SERIAL
> > imply MACB
> > imply MII
> > diff --git a/arch/riscv/cpu/fu540/cache.c b/arch/riscv/cpu/fu540/cache.c
> > index 0fc4ef6c00..3c754c4614 100644
> > --- a/arch/riscv/cpu/fu540/cache.c
> > +++ b/arch/riscv/cpu/fu540/cache.c
> > @@ -1,55 +1,33 @@
> > // SPDX-License-Identifier: GPL-2.0+
> > /*
> > - * Copyright (C) 2020 SiFive, Inc
> > + * Copyright (C) 2020 - 2021 SiFive, Inc
> > *
> > * Authors:
> > * Pragnesh Patel <pragnesh.pa...@sifive.com>
> > */
> >
> > #include <common.h>
> > -#include <asm/global_data.h>
> > -#include <asm/io.h>
> > -#include <linux/bitops.h>
> > +#include <cache.h>
> > +#include <dm.h>
> >
> > -/* Register offsets */
> > -#define L2_CACHE_CONFIG 0x000
> > -#define L2_CACHE_ENABLE 0x008
> > -
> > -#define MASK_NUM_WAYS GENMASK(15, 8)
> > -#define NUM_WAYS_SHIFT 8
> > -
> > -DECLARE_GLOBAL_DATA_PTR;
> > -
> > -int cache_enable_ways(void)
> > +int sifive_ccache_enable_ways(void)
> > {
>
> Is there any reason this function is duplicated? See below for further
> comments.
Sorry, I don't completely understand about duplication here. Do you
mean why we need this function? or why is it present in both unleashed
and unmatched?
>
> > - const void *blob = gd->fdt_blob;
> > - int node;
> > - fdt_addr_t base;
> > - u32 config;
> > - u32 ways;
> > -
> > - volatile u32 *enable;
> > -
> > - node = fdt_node_offset_by_compatible(blob, -1,
> > - "sifive,fu540-c000-ccache");
> > -
> > - if (node < 0)
> > - return node;
> > -
> > - base = fdtdec_get_addr_size_auto_parent(blob, 0, node, "reg", 0,
> > - NULL, false);
> > - if (base == FDT_ADDR_T_NONE)
> > - return FDT_ADDR_T_NONE;
> > -
> > - config = readl((volatile u32 *)base + L2_CACHE_CONFIG);
> > - ways = (config & MASK_NUM_WAYS) >> NUM_WAYS_SHIFT;
> > -
> > - enable = (volatile u32 *)(base + L2_CACHE_ENABLE);
> > + struct udevice *dev;
> > + int ret;
> > +
> > + ret = uclass_get_device_by_driver(UCLASS_CACHE,
> > + DM_DRIVER_GET(sifive_ccache),
> > + &dev);
> > + if (ret) {
> > + pr_debug("%s: could not enable cache ways\n", __func__);
> > + return ret;
> > + }
> > +
> > + ret = cache_enable(dev);
> > + if (ret) {
> > + pr_debug("%s: ccache enable filed\n", __func__);
> > + return ret;
> > + }
> >
> > - /* memory barrier */
> > - mb();
> > - (*enable) = ways - 1;
> > - /* memory barrier */
> > - mb();
> > return 0;
> > }
> > diff --git a/arch/riscv/cpu/fu740/Kconfig b/arch/riscv/cpu/fu740/Kconfig
> > index 8e54310b9c..87d8016c88 100644
> > --- a/arch/riscv/cpu/fu740/Kconfig
> > +++ b/arch/riscv/cpu/fu740/Kconfig
> > @@ -19,6 +19,7 @@ config SIFIVE_FU740
> > imply SMP
> > imply CLK_SIFIVE
> > imply CLK_SIFIVE_PRCI
> > + imply SIFIVE_CACHE_CCACHE
> > imply SIFIVE_SERIAL
> > imply MACB
> > imply MII
> > diff --git a/arch/riscv/cpu/fu740/cache.c b/arch/riscv/cpu/fu740/cache.c
> > index 680955c9e3..1d6c295d98 100644
> > --- a/arch/riscv/cpu/fu740/cache.c
> > +++ b/arch/riscv/cpu/fu740/cache.c
> > @@ -7,49 +7,27 @@
> > */
> >
> > #include <common.h>
> > -#include <asm/io.h>
> > -#include <linux/bitops.h>
> > -#include <asm/global_data.h>
> > +#include <cache.h>
> > +#include <dm.h>
> >
> > -/* Register offsets */
> > -#define L2_CACHE_CONFIG 0x000
> > -#define L2_CACHE_ENABLE 0x008
> > -
> > -#define MASK_NUM_WAYS GENMASK(15, 8)
> > -#define NUM_WAYS_SHIFT 8
> > -
> > -DECLARE_GLOBAL_DATA_PTR;
> > -
> > -int cache_enable_ways(void)
> > +int sifive_ccache_enable_ways(void)
> > {
> > - const void *blob = gd->fdt_blob;
> > - int node;
> > - fdt_addr_t base;
> > - u32 config;
> > - u32 ways;
> > -
> > - volatile u32 *enable;
> > -
> > - node = fdt_node_offset_by_compatible(blob, -1,
> > - "sifive,fu740-c000-ccache");
> > -
> > - if (node < 0)
> > - return node;
> > -
> > - base = fdtdec_get_addr_size_auto_parent(blob, 0, node, "reg", 0,
> > - NULL, false);
> > - if (base == FDT_ADDR_T_NONE)
> > - return FDT_ADDR_T_NONE;
> > -
> > - config = readl((volatile u32 *)base + L2_CACHE_CONFIG);
> > - ways = (config & MASK_NUM_WAYS) >> NUM_WAYS_SHIFT;
> > -
> > - enable = (volatile u32 *)(base + L2_CACHE_ENABLE);
> > + struct udevice *dev;
> > + int ret;
> > +
> > + ret = uclass_get_device_by_driver(UCLASS_CACHE,
> > + DM_DRIVER_GET(sifive_ccache),
> > + &dev);
> > + if (ret) {
> > + pr_debug("%s: could not enable cache ways\n", __func__);
> > + return ret;
>
> return log_msg_ret(...);
>
> (and you don't have to add a __func__ parameter if you use that function)
Okay, let me change the function. Thanks.
>
> > + }
> > +
> > + ret = cache_enable(dev);
> > + if (ret) {
> > + pr_debug("%s: ccache enable filed\n", __func__);
>
> failed; ditto
okay.
>
> > + return ret;
> > + }
> >
> > - /* memory barrier */
> > - mb();
> > - (*enable) = ways - 1;
> > - /* memory barrier */
> > - mb();
>
> Is this handled by the __iowmb/__iormb in writel/readl in the driver?
>
Yes, the ccache driver uses writel to write the register, and writel
will invoke __iowmb.
> > return 0;
> > }
> > diff --git a/arch/riscv/include/asm/arch-fu540/cache.h
> > b/arch/riscv/include/asm/arch-fu540/cache.h
> > index 135a17c679..c252eb64d1 100644
> > --- a/arch/riscv/include/asm/arch-fu540/cache.h
> > +++ b/arch/riscv/include/asm/arch-fu540/cache.h
> > @@ -9,6 +9,6 @@
> > #ifndef _CACHE_SIFIVE_H
> > #define _CACHE_SIFIVE_H
> >
> > -int cache_enable_ways(void);
> > +int sifive_ccache_enable_ways(void);
> >
> > #endif /* _CACHE_SIFIVE_H */
> > diff --git a/arch/riscv/include/asm/arch-fu740/cache.h
> > b/arch/riscv/include/asm/arch-fu740/cache.h
> > index 7d4fe9942b..8c456e3658 100644
> > --- a/arch/riscv/include/asm/arch-fu740/cache.h
> > +++ b/arch/riscv/include/asm/arch-fu740/cache.h
> > @@ -9,6 +9,6 @@
> > #ifndef _CACHE_SIFIVE_H
> > #define _CACHE_SIFIVE_H
> >
> > -int cache_enable_ways(void);
> > +int sifive_ccache_enable_ways(void);
> >
> > #endif /* _CACHE_SIFIVE_H */
> > diff --git a/board/sifive/unleashed/unleashed.c
> > b/board/sifive/unleashed/unleashed.c
> > index 43027f0b54..12e61ec85f 100644
> > --- a/board/sifive/unleashed/unleashed.c
> > +++ b/board/sifive/unleashed/unleashed.c
> > @@ -126,14 +126,6 @@ void *board_fdt_blob_setup(void)
> >
> > int board_init(void)
> > {
> > - int ret;
> > -
> > /* enable all cache ways */
> > - ret = cache_enable_ways();
> > - if (ret) {
> > - debug("%s: could not enable cache ways\n", __func__);
> > - return ret;
>
> ditto, though here I would just skip the error message since you reported it
> above already
>
It seems to me that this part was dropped in this patch.
> > - }
> > -
> > - return 0;
> > + return sifive_ccache_enable_ways();
> > }
> > diff --git a/board/sifive/unmatched/unmatched.c
> > b/board/sifive/unmatched/unmatched.c
> > index 2f5629b578..d27c4d3e88 100644
> > --- a/board/sifive/unmatched/unmatched.c
> > +++ b/board/sifive/unmatched/unmatched.c
> > @@ -23,13 +23,6 @@ void *board_fdt_blob_setup(void)
> >
> > int board_init(void)
> > {
> > - int ret;
> > -
> > /* enable all cache ways */
> > - ret = cache_enable_ways();
> > - if (ret) {
> > - debug("%s: could not enable cache ways\n", __func__);
>
> ditto
Okay.
>
> > - return ret;
> > - }
> > - return 0;
> > + return sifive_ccache_enable_ways();
> > }
> >
>
> --Sean
