[PATCH v7 10/22] clk: sifive: fu540-prci: ddr and ethernet clock initialization in SPL
Bin Meng
bmeng.cn at gmail.com
Sat May 2 14:28:29 CEST 2020
Hi Pragnesh,
On Sat, May 2, 2020 at 6:08 PM Pragnesh Patel <pragnesh.patel at sifive.com> wrote:
>
> Add ddr clock release reset and ehternet clock initialization for
> SPL
>
> Signed-off-by: Pragnesh Patel <pragnesh.patel at sifive.com>
> ---
> drivers/clk/sifive/fu540-prci.c | 87 ++++++++++++++++++++++++++++++---
> 1 file changed, 81 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clk/sifive/fu540-prci.c b/drivers/clk/sifive/fu540-prci.c
> index bf06c3a3bb..1c89bdf242 100644
> --- a/drivers/clk/sifive/fu540-prci.c
> +++ b/drivers/clk/sifive/fu540-prci.c
> @@ -41,6 +41,8 @@
> #include <linux/clk/analogbits-wrpll-cln28hpc.h>
> #include <dt-bindings/clock/sifive-fu540-prci.h>
>
> +#define MHz 1000000
> +
> /*
> * EXPECTED_CLK_PARENT_COUNT: how many parent clocks this driver expects:
> * hfclk and rtcclk
> @@ -152,6 +154,12 @@
> #define PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_MASK \
> (0x1 << PRCI_CLKMUXSTATUSREG_TLCLKSEL_STATUS_SHIFT)
>
> +/* PROCMONCFG */
> +#define PRCI_PROCMONCFG_OFFSET 0xF0
> +#define PRCI_PROCMONCFG_CORE_CLOCK_SHIFT 24
> +#define PRCI_PROCMONCFG_CORE_CLOCK_MASK \
> + (0x1 << PRCI_PROCMONCFG_CORE_CLOCK_SHIFT)
> +
> /*
> * Private structures
> */
> @@ -176,6 +184,7 @@ struct __prci_data {
> * @disable_bypass: fn ptr to code to not bypass the WRPLL (or NULL)
> * @cfg0_offs: WRPLL CFG0 register offset (in bytes) from the PRCI base address
> * @cfg1_offs: WRPLL CFG1 register offset (in bytes) from the PRCI base address
> + * @release_reset: fn ptr to code to release clock reset
> *
> * @enable_bypass and @disable_bypass are used for WRPLL instances
> * that contain a separate external glitchless clock mux downstream
> @@ -187,6 +196,9 @@ struct __prci_wrpll_data {
> void (*disable_bypass)(struct __prci_data *pd);
> u8 cfg0_offs;
> u8 cfg1_offs;
> +#ifdef CONFIG_SPL_BUILD
> + void (*release_reset)(struct __prci_data *pd);
> +#endif
> };
>
> struct __prci_clock;
> @@ -476,6 +488,11 @@ static int sifive_fu540_prci_clock_enable(struct __prci_clock *pc, bool enable)
>
> if (enable) {
> __prci_wrpll_write_cfg1(pd, pwd, PRCI_COREPLLCFG1_CKE_MASK);
> +
> +#ifdef CONFIG_SPL_BUILD
> + if (pwd->release_reset)
> + pwd->release_reset(pd);
> +#endif
> } else {
> u32 r;
>
> @@ -495,11 +512,6 @@ static const struct __prci_clock_ops sifive_fu540_prci_wrpll_clk_ops = {
> .enable_clk = sifive_fu540_prci_clock_enable,
> };
>
> -static const struct __prci_clock_ops sifive_fu540_prci_wrpll_ro_clk_ops = {
> - .recalc_rate = sifive_fu540_prci_wrpll_recalc_rate,
> - .enable_clk = sifive_fu540_prci_clock_enable,
> -};
> -
> /* TLCLKSEL clock integration */
>
> static unsigned long sifive_fu540_prci_tlclksel_recalc_rate(
> @@ -521,6 +533,39 @@ static const struct __prci_clock_ops sifive_fu540_prci_tlclksel_clk_ops = {
> .recalc_rate = sifive_fu540_prci_tlclksel_recalc_rate,
> };
>
> +#ifdef CONFIG_SPL_BUILD
> +/**
> + * __prci_ddr_release_reset() - Release DDR reset
> + * @pd: struct __prci_data * for the PRCI containing the DDRCLK mux reg
> + *
> + */
> +static void __prci_ddr_release_reset(struct __prci_data *pd)
> +{
> + u32 v;
> +
> + v = __prci_readl(pd, PRCI_DEVICESRESETREG_OFFSET);
> + v |= PRCI_DEVICESRESETREG_DDR_CTRL_RST_N_MASK;
> + __prci_writel(v, PRCI_DEVICESRESETREG_OFFSET, pd);
> +
> + // HACK to get the '1 full controller clock cycle'.
nits: should use /* */
> + asm volatile ("fence");
> + v = __prci_readl(pd, PRCI_DEVICESRESETREG_OFFSET);
> + v |= (PRCI_DEVICESRESETREG_DDR_AXI_RST_N_MASK |
> + PRCI_DEVICESRESETREG_DDR_AHB_RST_N_MASK |
> + PRCI_DEVICESRESETREG_DDR_PHY_RST_N_MASK);
> + __prci_writel(v, PRCI_DEVICESRESETREG_OFFSET, pd);
> + // HACK to get the '1 full controller clock cycle'.
the same here
> + asm volatile ("fence");
> +
> + /* These take like 16 cycles to actually propagate. We can't go sending
nits: wrong multi-line comment format
> + * stuff before they come out of reset. So wait. (TODO: Add a register
> + * to read the current reset states, or DDR Control device?)
Is there no register to reflect the reset states?
> + */
> + for (int i = 0; i < 256; i++)
> + asm volatile ("nop");
> +}
> +#endif
> +
> /*
> * PRCI integration data for each WRPLL instance
> */
> @@ -535,6 +580,9 @@ static struct __prci_wrpll_data __prci_corepll_data = {
> static struct __prci_wrpll_data __prci_ddrpll_data = {
> .cfg0_offs = PRCI_DDRPLLCFG0_OFFSET,
> .cfg1_offs = PRCI_DDRPLLCFG1_OFFSET,
> +#ifdef CONFIG_SPL_BUILD
> + .release_reset = __prci_ddr_release_reset,
> +#endif
> };
>
> static struct __prci_wrpll_data __prci_gemgxlpll_data = {
> @@ -556,7 +604,7 @@ static struct __prci_clock __prci_init_clocks[] = {
> [PRCI_CLK_DDRPLL] = {
> .name = "ddrpll",
> .parent_name = "hfclk",
> - .ops = &sifive_fu540_prci_wrpll_ro_clk_ops,
> + .ops = &sifive_fu540_prci_wrpll_clk_ops,
> .pwd = &__prci_ddrpll_data,
> },
> [PRCI_CLK_GEMGXLPLL] = {
> @@ -662,6 +710,29 @@ static int sifive_fu540_prci_disable(struct clk *clk)
> return ret;
> }
>
> +#ifdef CONFIG_SPL_BUILD
> +static void ethernet_init(struct udevice *dev)
> +{
> + u32 v;
> + struct clk clock;
> + struct __prci_data *pd = dev_get_priv(dev);
> +
> + /* GEMGXL init */
> + clock.id = PRCI_CLK_GEMGXLPLL;
> + sifive_fu540_prci_set_rate(&clock, 125UL * MHz);
> + sifive_fu540_prci_clock_enable(&__prci_init_clocks[clock.id], 1);
> +
> + /* Release GEMGXL reset */
> + v = __prci_readl(pd, PRCI_DEVICESRESETREG_OFFSET);
> + v |= PRCI_DEVICESRESETREG_GEMGXL_RST_N_MASK;
> + __prci_writel(v, PRCI_DEVICESRESETREG_OFFSET, pd);
> +
> + /* Procmon => core clock */
> + __prci_writel(PRCI_PROCMONCFG_CORE_CLOCK_MASK, PRCI_PROCMONCFG_OFFSET,
> + pd);
> +}
> +#endif
> +
> static int sifive_fu540_prci_probe(struct udevice *dev)
> {
> int i, err;
> @@ -687,6 +758,10 @@ static int sifive_fu540_prci_probe(struct udevice *dev)
> __prci_wrpll_read_cfg0(pd, pc->pwd);
> }
>
> +#ifdef CONFIG_SPL_BUILD
> + ethernet_init(dev);
> +#endif
> +
> return 0;
> }
Regards,
Bin
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