Assuming mac_clk is fed by an external clock, set clk_rmii_src clock select control register from IO for rgmii interface.
Signed-off-by: David Wu david.wu@rock-chips.com ---
Changes in v3: - Add "set parent" for gmac - Add internal mac clk div_sel for gmac
Changes in v2: - New patch
drivers/clk/rockchip/clk_rk322x.c | 107 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+)
diff --git a/drivers/clk/rockchip/clk_rk322x.c b/drivers/clk/rockchip/clk_rk322x.c index c8a2413..4e6d2f0 100644 --- a/drivers/clk/rockchip/clk_rk322x.c +++ b/drivers/clk/rockchip/clk_rk322x.c @@ -239,6 +239,41 @@ static ulong rockchip_mmc_get_clk(struct rk322x_cru *cru, uint clk_general_rate, return DIV_TO_RATE(src_rate, div) / 2; }
+static ulong rk322x_mac_set_clk(struct rk322x_cru *cru, uint freq) +{ + ulong ret; + + /* + * The gmac clock can be derived either from an external clock + * or can be generated from internally by a divider from SCLK_MAC. + */ + if (readl(&cru->cru_clksel_con[5]) & BIT(5)) { + /* An external clock will always generate the right rate... */ + ret = freq; + } else { + u32 con = readl(&cru->cru_clksel_con[5]); + ulong pll_rate; + u8 div; + + if ((con >> MAC_PLL_SEL_SHIFT) & MAC_PLL_SEL_MASK) + pll_rate = GPLL_HZ; + else + /* CPLL is not set */ + return -EPERM; + + div = DIV_ROUND_UP(pll_rate, freq) - 1; + if (div <= 0x1f) + rk_clrsetreg(&cru->cru_clksel_con[5], CLK_MAC_DIV_MASK, + div << CLK_MAC_DIV_SHIFT); + else + debug("Unsupported div for gmac:%d\n", div); + + return DIV_TO_RATE(pll_rate, div); + } + + return ret; +} + static ulong rockchip_mmc_set_clk(struct rk322x_cru *cru, uint clk_general_rate, int periph, uint freq) { @@ -352,6 +387,11 @@ static ulong rk322x_clk_set_rate(struct clk *clk, ulong rate) case CLK_DDR: new_rate = rk322x_ddr_set_clk(priv->cru, rate); break; + case SCLK_MAC: + new_rate = rk322x_mac_set_clk(priv->cru, rate); + break; + case PLL_GPLL: + return 0; default: return -ENOENT; } @@ -359,9 +399,76 @@ static ulong rk322x_clk_set_rate(struct clk *clk, ulong rate) return new_rate; }
+static int rk322x_gmac_set_parent(struct clk *clk, struct clk *parent) +{ + struct rk322x_clk_priv *priv = dev_get_priv(clk->dev); + struct rk322x_cru *cru = priv->cru; + + /* + * If the requested parent is in the same clock-controller and the id + * is SCLK_MAC_SRC ("sclk_gmac_src"), switch to the internal clock. + */ + if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC_SRC)) { + debug("%s: switching RGMII to SCLK_MAC_SRC\n", __func__); + rk_clrsetreg(&cru->cru_clksel_con[5], BIT(5), 0); + return 0; + } + + /* + * If the requested parent is in the same clock-controller and the id + * is SCLK_MAC_EXTCLK (sclk_mac_extclk), switch to the external clock. + */ + if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC_EXTCLK)) { + debug("%s: switching RGMII to SCLK_MAC_EXTCLK\n", __func__); + rk_clrsetreg(&cru->cru_clksel_con[5], BIT(5), BIT(5)); + return 0; + } + + return -EINVAL; +} + +static int rk322x_gmac_extclk_set_parent(struct clk *clk, struct clk *parent) +{ + struct rk322x_clk_priv *priv = dev_get_priv(clk->dev); + const char *clock_output_name; + struct rk322x_cru *cru = priv->cru; + int ret; + + ret = dev_read_string_index(parent->dev, "clock-output-names", + parent->id, &clock_output_name); + if (ret < 0) + return -ENODATA; + + if (!strcmp(clock_output_name, "ext_gmac")) { + debug("%s: switching gmac extclk to ext_gmac\n", __func__); + rk_clrsetreg(&cru->cru_clksel_con[29], BIT(10), 0); + return 0; + } else if (!strcmp(clock_output_name, "phy_50m_out")) { + debug("%s: switching gmac extclk to phy_50m_out\n", __func__); + rk_clrsetreg(&cru->cru_clksel_con[29], BIT(10), BIT(10)); + return 0; + } + + return -EINVAL; +} + +static int rk322x_clk_set_parent(struct clk *clk, struct clk *parent) +{ + switch (clk->id) { + case SCLK_MAC: + return rk322x_gmac_set_parent(clk, parent); + case SCLK_MAC_EXTCLK: + return rk322x_gmac_extclk_set_parent(clk, parent); + } + + debug("%s: unsupported clk %ld\n", __func__, clk->id); + return -ENOENT; +} + static struct clk_ops rk322x_clk_ops = { .get_rate = rk322x_clk_get_rate, .set_rate = rk322x_clk_set_rate, + .set_parent = rk322x_clk_set_parent, };
static int rk322x_clk_ofdata_to_platdata(struct udevice *dev)