[PATCH v2 05/24] mtd: rawnand: sunxi: remove usage of struct sunxi_ccm_reg
Andre Przywara
andre.przywara at arm.com
Mon Jan 19 15:10:20 CET 2026
On Tue, 28 Oct 2025 10:12:26 +0100
Richard Genoud <richard.genoud at bootlin.com> wrote:
Hi Richard,
many thanks for doing this change.
> The sunxi_ccm_reg is legacy, drop its usage from nand related code
>
> For that, CCU_NAND0_CLK_CFG and CCU_AHB_GATE1 are added to the clock
> files when missing.
> And clock code in sunxi_nand{,_spl}.c and board.c are changed to use the
> new scheme.
>
> Moreover, drop AHB_DIV_1 in favor of the more readable CCM_NAND_CTRL_M/N
>
> Suggested-by: Andre Przywara <andre.przywara at arm.com>
> Signed-off-by: Richard Genoud <richard.genoud at bootlin.com>
> ---
> arch/arm/include/asm/arch-sunxi/clock_sun4i.h | 1 +
> arch/arm/include/asm/arch-sunxi/clock_sun6i.h | 1 +
> arch/arm/include/asm/arch-sunxi/clock_sun8i_a83t.h | 1 +
> arch/arm/include/asm/arch-sunxi/clock_sun9i.h | 2 ++
> board/sunxi/board.c | 11 ++++++-----
> drivers/mtd/nand/raw/sunxi_nand.c | 11 +++++------
> drivers/mtd/nand/raw/sunxi_nand_spl.c | 13 +++++++------
> 7 files changed, 23 insertions(+), 17 deletions(-)
>
> diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun4i.h b/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
> index 00bdd5f938df..caa4b62b3e2d 100644
> --- a/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
> +++ b/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
> @@ -11,6 +11,7 @@
> #define _SUNXI_CLOCK_SUN4I_H
>
> #define CCU_AHB_GATE0 0x60
> +#define CCU_NAND0_CLK_CFG 0x80
> #define CCU_MMC0_CLK_CFG 0x88
> #define CCU_MMC1_CLK_CFG 0x8c
> #define CCU_MMC2_CLK_CFG 0x90
> diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun6i.h b/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
> index 28c3faccbbcf..bdb08a32d01b 100644
> --- a/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
> +++ b/arch/arm/include/asm/arch-sunxi/clock_sun6i.h
> @@ -11,6 +11,7 @@
> #define _SUNXI_CLOCK_SUN6I_H
>
> #define CCU_AHB_GATE0 0x060
> +#define CCU_NAND0_CLK_CFG 0x80
Just a nit, but can you please change this to 0x080, to align with the
other numbers?
> #define CCU_MMC0_CLK_CFG 0x088
> #define CCU_MMC1_CLK_CFG 0x08c
> #define CCU_MMC2_CLK_CFG 0x090
> diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun8i_a83t.h b/arch/arm/include/asm/arch-sunxi/clock_sun8i_a83t.h
> index 5ad2163926ad..70cd0ca00d21 100644
> --- a/arch/arm/include/asm/arch-sunxi/clock_sun8i_a83t.h
> +++ b/arch/arm/include/asm/arch-sunxi/clock_sun8i_a83t.h
> @@ -14,6 +14,7 @@
> #define _SUNXI_CLOCK_SUN8I_A83T_H
>
> #define CCU_AHB_GATE0 0x060
> +#define CCU_NAND0_CLK_CFG 0x80
Same here.
> #define CCU_MMC0_CLK_CFG 0x088
> #define CCU_MMC1_CLK_CFG 0x08c
> #define CCU_MMC2_CLK_CFG 0x090
> diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun9i.h b/arch/arm/include/asm/arch-sunxi/clock_sun9i.h
> index 8d696e533f8f..3448f3fb3225 100644
> --- a/arch/arm/include/asm/arch-sunxi/clock_sun9i.h
> +++ b/arch/arm/include/asm/arch-sunxi/clock_sun9i.h
> @@ -12,11 +12,13 @@
> #include <linux/bitops.h>
> #endif
>
> +#define CCU_NAND0_CLK_CFG 0x400
> #define CCU_MMC0_CLK_CFG 0x410
> #define CCU_MMC1_CLK_CFG 0x414
> #define CCU_MMC2_CLK_CFG 0x418
> #define CCU_MMC3_CLK_CFG 0x41c
> #define CCU_AHB_GATE0 0x580
> +#define CCU_AHB_GATE1 0x584
> #define CCU_AHB_RESET0_CFG 0x5a0
For the records, I checked the value of the offsets, they look correct.
> struct sunxi_ccm_reg {
> diff --git a/board/sunxi/board.c b/board/sunxi/board.c
> index 2929bc17f084..09b531b7f52a 100644
> --- a/board/sunxi/board.c
> +++ b/board/sunxi/board.c
> @@ -307,15 +307,16 @@ static void nand_pinmux_setup(void)
>
> static void nand_clock_setup(void)
> {
> - struct sunxi_ccm_reg *const ccm =
> - (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
> + void * const ccm = (void *)SUNXI_CCM_BASE;
>
> - setbits_le32(&ccm->ahb_gate0, (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
> + setbits_le32(ccm + CCU_AHB_GATE0,
> + (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
> #if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I || \
> defined CONFIG_MACH_SUN9I || defined CONFIG_MACH_SUN50I
So the usage of #define's for the offsets instead of struct members would
now allow for those preprocessor guards to be replaced by C statements:
if (IS_ENABLED(CONFIG_MACH_SUN6I) || IS_ENABLED(CONFIG_MACH_SUN8I)
...
> - setbits_le32(&ccm->ahb_reset0_cfg, (1 << AHB_GATE_OFFSET_NAND0));
> + setbits_le32(ccm + CCU_AHB_RESET0_CFG, (1 << AHB_GATE_OFFSET_NAND0));
> #endif
> - setbits_le32(&ccm->nand0_clk_cfg, CCM_NAND_CTRL_ENABLE | AHB_DIV_1);
> + setbits_le32(ccm + CCU_NAND0_CLK_CFG, CCM_NAND_CTRL_ENABLE |
> + CCM_NAND_CTRL_N(0) | CCM_NAND_CTRL_M(1));
> }
>
> void board_nand_init(void)
> diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
> index c6b9b2a4ebac..ba2740ed1876 100644
> --- a/drivers/mtd/nand/raw/sunxi_nand.c
> +++ b/drivers/mtd/nand/raw/sunxi_nand.c
> @@ -289,8 +289,7 @@ static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_hw_control *ctrl)
>
> static void sunxi_nfc_set_clk_rate(unsigned long hz)
> {
> - struct sunxi_ccm_reg *const ccm =
> - (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
> + void * const ccm = (void *)SUNXI_CCM_BASE;
> int div_m, div_n;
>
> div_m = (clock_get_pll6() + hz - 1) / hz;
> @@ -305,14 +304,14 @@ static void sunxi_nfc_set_clk_rate(unsigned long hz)
> /* config mod clock */
> writel(CCM_NAND_CTRL_ENABLE | CCM_NAND_CTRL_PLL6 |
> CCM_NAND_CTRL_N(div_n) | CCM_NAND_CTRL_M(div_m),
> - &ccm->nand0_clk_cfg);
> + ccm + CCU_NAND0_CLK_CFG);
>
> /* gate on nand clock */
> - setbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_NAND0));
> + setbits_le32(ccm + CCU_AHB_GATE0, (1 << AHB_GATE_OFFSET_NAND0));
> #ifdef CONFIG_MACH_SUN9I
same here
> - setbits_le32(&ccm->ahb_gate1, (1 << AHB_GATE_OFFSET_DMA));
> + setbits_le32(ccm + CCU_AHB_GATE1, (1 << AHB_GATE_OFFSET_DMA));
> #else
> - setbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_DMA));
> + setbits_le32(ccm + CCU_AHB_GATE0, (1 << AHB_GATE_OFFSET_DMA));
> #endif
> }
>
> diff --git a/drivers/mtd/nand/raw/sunxi_nand_spl.c b/drivers/mtd/nand/raw/sunxi_nand_spl.c
> index e90450439e41..2fcf52658008 100644
> --- a/drivers/mtd/nand/raw/sunxi_nand_spl.c
> +++ b/drivers/mtd/nand/raw/sunxi_nand_spl.c
> @@ -533,14 +533,15 @@ unsigned int nand_page_size(void)
>
> void nand_deselect(void)
> {
> - struct sunxi_ccm_reg *const ccm =
> - (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
> + void * const ccm = (void *)SUNXI_CCM_BASE;
>
> - clrbits_le32(&ccm->ahb_gate0, (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
> + clrbits_le32(ccm + CCU_AHB_GATE0,
> + (CLK_GATE_OPEN << AHB_GATE_OFFSET_NAND0));
> #ifdef CONFIG_MACH_SUN9I
and here.
But the actual changes look alright, including the usage of
CCM_NAND_CTRL_N() and CCM_NAND_CTRL_M().
Cheers,
Andre
> - clrbits_le32(&ccm->ahb_gate1, (1 << AHB_GATE_OFFSET_DMA));
> + clrbits_le32(ccm + CCU_AHB_GATE1, (1 << AHB_GATE_OFFSET_DMA));
> #else
> - clrbits_le32(&ccm->ahb_gate0, (1 << AHB_GATE_OFFSET_DMA));
> + clrbits_le32(ccm + CCU_AHB_GATE0, (1 << AHB_GATE_OFFSET_DMA));
> #endif
> - clrbits_le32(&ccm->nand0_clk_cfg, CCM_NAND_CTRL_ENABLE | AHB_DIV_1);
> + clrbits_le32(ccm + CCU_NAND0_CLK_CFG, CCM_NAND_CTRL_ENABLE |
> + CCM_NAND_CTRL_N(0) | CCM_NAND_CTRL_M(1));
> }
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