#include <dm/lists.h>
#include <dt-bindings/clock/ast2500-scu.h>
+/*
+ * MAC Clock Delay settings, taken from Aspeed SDK
+ */
+#define RGMII_TXCLK_ODLY 8
+#define RMII_RXCLK_IDLY 2
+
+/*
+ * TGMII Clock Duty constants, taken from Aspeed SDK
+ */
+#define RGMII2_TXCK_DUTY 0x66
+#define RGMII1_TXCK_DUTY 0x64
+
+#define D2PLL_DEFAULT_RATE (250 * 1000 * 1000)
+
DECLARE_GLOBAL_DATA_PTR;
/*
+ * Clock divider/multiplier configuration struct.
* For H-PLL and M-PLL the formula is
* (Output Frequency) = CLKIN * ((M + 1) / (N + 1)) / (P + 1)
* M - Numerator
* N - Denumerator
* P - Post Divider
* They have the same layout in their control register.
+ *
+ * D-PLL and D2-PLL have extra divider (OD + 1), which is not
+ * yet needed and ignored by clock configurations.
*/
+struct ast2500_div_config {
+ unsigned int num;
+ unsigned int denum;
+ unsigned int post_div;
+};
/*
* Get the rate of the M-PLL clock from input clock frequency and
*/
static ulong ast2500_get_mpll_rate(ulong clkin, u32 mpll_reg)
{
- const ulong num = (mpll_reg >> SCU_MPLL_NUM_SHIFT) & SCU_MPLL_NUM_MASK;
- const ulong denum = (mpll_reg >> SCU_MPLL_DENUM_SHIFT)
- & SCU_MPLL_DENUM_MASK;
- const ulong post_div = (mpll_reg >> SCU_MPLL_POST_SHIFT)
- & SCU_MPLL_POST_MASK;
+ const ulong num = (mpll_reg & SCU_MPLL_NUM_MASK) >> SCU_MPLL_NUM_SHIFT;
+ const ulong denum = (mpll_reg & SCU_MPLL_DENUM_MASK)
+ >> SCU_MPLL_DENUM_SHIFT;
+ const ulong post_div = (mpll_reg & SCU_MPLL_POST_MASK)
+ >> SCU_MPLL_POST_SHIFT;
- return (clkin * ((num + 1) / (denum + 1))) / post_div;
+ return (clkin * ((num + 1) / (denum + 1))) / (post_div + 1);
}
/*
*/
static ulong ast2500_get_hpll_rate(ulong clkin, u32 hpll_reg)
{
- const ulong num = (hpll_reg >> SCU_HPLL_NUM_SHIFT) & SCU_HPLL_NUM_MASK;
- const ulong denum = (hpll_reg >> SCU_HPLL_DENUM_SHIFT)
- & SCU_HPLL_DENUM_MASK;
- const ulong post_div = (hpll_reg >> SCU_HPLL_POST_SHIFT)
- & SCU_HPLL_POST_MASK;
+ const ulong num = (hpll_reg & SCU_HPLL_NUM_MASK) >> SCU_HPLL_NUM_SHIFT;
+ const ulong denum = (hpll_reg & SCU_HPLL_DENUM_MASK)
+ >> SCU_HPLL_DENUM_SHIFT;
+ const ulong post_div = (hpll_reg & SCU_HPLL_POST_MASK)
+ >> SCU_HPLL_POST_SHIFT;
- return (clkin * ((num + 1) / (denum + 1))) / post_div;
+ return (clkin * ((num + 1) / (denum + 1))) / (post_div + 1);
}
static ulong ast2500_get_clkin(struct ast2500_scu *scu)
rate = ast2500_get_mpll_rate(clkin,
readl(&priv->scu->m_pll_param));
break;
+ case BCLK_PCLK:
+ {
+ ulong apb_div = 4 + 4 * ((readl(&priv->scu->clk_sel1)
+ & SCU_PCLK_DIV_MASK)
+ >> SCU_PCLK_DIV_SHIFT);
+ rate = ast2500_get_hpll_rate(clkin,
+ readl(&priv->
+ scu->h_pll_param));
+ rate = rate / apb_div;
+ }
+ break;
case PCLK_UART1:
rate = ast2500_get_uart_clk_rate(priv->scu, 1);
break;
return rate;
}
-static void ast2500_scu_unlock(struct ast2500_scu *scu)
-{
- writel(SCU_UNLOCK_VALUE, &scu->protection_key);
- while (!readl(&scu->protection_key))
- ;
-}
-
-static void ast2500_scu_lock(struct ast2500_scu *scu)
-{
- writel(~SCU_UNLOCK_VALUE, &scu->protection_key);
- while (readl(&scu->protection_key))
- ;
-}
-
-static ulong ast2500_configure_ddr(struct ast2500_scu *scu, ulong rate)
+/*
+ * @input_rate - the rate of input clock in Hz
+ * @requested_rate - desired output rate in Hz
+ * @div - this is an IN/OUT parameter, at input all fields of the config
+ * need to be set to their maximum allowed values.
+ * The result (the best config we could find), would also be returned
+ * in this structure.
+ *
+ * @return The clock rate, when the resulting div_config is used.
+ */
+static ulong ast2500_calc_clock_config(ulong input_rate, ulong requested_rate,
+ struct ast2500_div_config *cfg)
{
- ulong clkin = ast2500_get_clkin(scu);
- u32 mpll_reg;
-
/*
- * There are not that many combinations of numerator, denumerator
- * and post divider, so just brute force the best combination.
- * However, to avoid overflow when multiplying, use kHz.
+ * The assumption is that kHz precision is good enough and
+ * also enough to avoid overflow when multiplying.
*/
- const ulong clkin_khz = clkin / 1000;
- const ulong rate_khz = rate / 1000;
- ulong best_num = 0;
- ulong best_denum = 0;
- ulong best_post = 0;
- ulong delta = rate;
- ulong num, denum, post;
-
- for (denum = 0; denum <= SCU_MPLL_DENUM_MASK; ++denum) {
- for (post = 0; post <= SCU_MPLL_POST_MASK; ++post) {
- num = (rate_khz * (post + 1) / clkin_khz) * (denum + 1);
- ulong new_rate_khz = (clkin_khz
- * ((num + 1) / (denum + 1)))
- / (post + 1);
+ const ulong input_rate_khz = input_rate / 1000;
+ const ulong rate_khz = requested_rate / 1000;
+ const struct ast2500_div_config max_vals = *cfg;
+ struct ast2500_div_config it = { 0, 0, 0 };
+ ulong delta = rate_khz;
+ ulong new_rate_khz = 0;
+
+ for (; it.denum <= max_vals.denum; ++it.denum) {
+ for (it.post_div = 0; it.post_div <= max_vals.post_div;
+ ++it.post_div) {
+ it.num = (rate_khz * (it.post_div + 1) / input_rate_khz)
+ * (it.denum + 1);
+ if (it.num > max_vals.num)
+ continue;
+
+ new_rate_khz = (input_rate_khz
+ * ((it.num + 1) / (it.denum + 1)))
+ / (it.post_div + 1);
/* Keep the rate below requested one. */
if (new_rate_khz > rate_khz)
if (new_rate_khz - rate_khz < delta) {
delta = new_rate_khz - rate_khz;
-
- best_num = num;
- best_denum = denum;
- best_post = post;
-
+ *cfg = it;
if (delta == 0)
- goto rate_calc_done;
+ return new_rate_khz * 1000;
}
}
}
- rate_calc_done:
+ return new_rate_khz * 1000;
+}
+
+static ulong ast2500_configure_ddr(struct ast2500_scu *scu, ulong rate)
+{
+ ulong clkin = ast2500_get_clkin(scu);
+ u32 mpll_reg;
+ struct ast2500_div_config div_cfg = {
+ .num = (SCU_MPLL_NUM_MASK >> SCU_MPLL_NUM_SHIFT),
+ .denum = (SCU_MPLL_DENUM_MASK >> SCU_MPLL_DENUM_SHIFT),
+ .post_div = (SCU_MPLL_POST_MASK >> SCU_MPLL_POST_SHIFT),
+ };
+
+ ast2500_calc_clock_config(clkin, rate, &div_cfg);
+
mpll_reg = readl(&scu->m_pll_param);
- mpll_reg &= ~((SCU_MPLL_POST_MASK << SCU_MPLL_POST_SHIFT)
- | (SCU_MPLL_NUM_MASK << SCU_MPLL_NUM_SHIFT)
- | (SCU_MPLL_DENUM_MASK << SCU_MPLL_DENUM_SHIFT));
- mpll_reg |= (best_post << SCU_MPLL_POST_SHIFT)
- | (best_num << SCU_MPLL_NUM_SHIFT)
- | (best_denum << SCU_MPLL_DENUM_SHIFT);
-
- ast2500_scu_unlock(scu);
+ mpll_reg &= ~(SCU_MPLL_POST_MASK | SCU_MPLL_NUM_MASK
+ | SCU_MPLL_DENUM_MASK);
+ mpll_reg |= (div_cfg.post_div << SCU_MPLL_POST_SHIFT)
+ | (div_cfg.num << SCU_MPLL_NUM_SHIFT)
+ | (div_cfg.denum << SCU_MPLL_DENUM_SHIFT);
+
+ ast_scu_unlock(scu);
writel(mpll_reg, &scu->m_pll_param);
- ast2500_scu_lock(scu);
+ ast_scu_lock(scu);
return ast2500_get_mpll_rate(clkin, mpll_reg);
}
+static ulong ast2500_configure_mac(struct ast2500_scu *scu, int index)
+{
+ ulong clkin = ast2500_get_clkin(scu);
+ ulong hpll_rate = ast2500_get_hpll_rate(clkin,
+ readl(&scu->h_pll_param));
+ ulong required_rate;
+ u32 hwstrap;
+ u32 divisor;
+ u32 reset_bit;
+ u32 clkstop_bit;
+
+ /*
+ * According to data sheet, for 10/100 mode the MAC clock frequency
+ * should be at least 25MHz and for 1000 mode at least 100MHz
+ */
+ hwstrap = readl(&scu->hwstrap);
+ if (hwstrap & (SCU_HWSTRAP_MAC1_RGMII | SCU_HWSTRAP_MAC2_RGMII))
+ required_rate = 100 * 1000 * 1000;
+ else
+ required_rate = 25 * 1000 * 1000;
+
+ divisor = hpll_rate / required_rate;
+
+ if (divisor < 4) {
+ /* Clock can't run fast enough, but let's try anyway */
+ debug("MAC clock too slow\n");
+ divisor = 4;
+ } else if (divisor > 16) {
+ /* Can't slow down the clock enough, but let's try anyway */
+ debug("MAC clock too fast\n");
+ divisor = 16;
+ }
+
+ switch (index) {
+ case 1:
+ reset_bit = SCU_SYSRESET_MAC1;
+ clkstop_bit = SCU_CLKSTOP_MAC1;
+ break;
+ case 2:
+ reset_bit = SCU_SYSRESET_MAC2;
+ clkstop_bit = SCU_CLKSTOP_MAC2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ast_scu_unlock(scu);
+ clrsetbits_le32(&scu->clk_sel1, SCU_MACCLK_MASK,
+ ((divisor - 2) / 2) << SCU_MACCLK_SHIFT);
+
+ /*
+ * Disable MAC, start its clock and re-enable it.
+ * The procedure and the delays (100us & 10ms) are
+ * specified in the datasheet.
+ */
+ setbits_le32(&scu->sysreset_ctrl1, reset_bit);
+ udelay(100);
+ clrbits_le32(&scu->clk_stop_ctrl1, clkstop_bit);
+ mdelay(10);
+ clrbits_le32(&scu->sysreset_ctrl1, reset_bit);
+
+ writel((RGMII2_TXCK_DUTY << SCU_CLKDUTY_RGMII2TXCK_SHIFT)
+ | (RGMII1_TXCK_DUTY << SCU_CLKDUTY_RGMII1TXCK_SHIFT),
+ &scu->clk_duty_sel);
+
+ ast_scu_lock(scu);
+
+ return required_rate;
+}
+
+static ulong ast2500_configure_d2pll(struct ast2500_scu *scu, ulong rate)
+{
+ /*
+ * The values and the meaning of the next three
+ * parameters are undocumented. Taken from Aspeed SDK.
+ */
+ const u32 d2_pll_ext_param = 0x2c;
+ const u32 d2_pll_sip = 0x11;
+ const u32 d2_pll_sic = 0x18;
+ u32 clk_delay_settings =
+ (RMII_RXCLK_IDLY << SCU_MICDS_MAC1RMII_RDLY_SHIFT)
+ | (RMII_RXCLK_IDLY << SCU_MICDS_MAC2RMII_RDLY_SHIFT)
+ | (RGMII_TXCLK_ODLY << SCU_MICDS_MAC1RGMII_TXDLY_SHIFT)
+ | (RGMII_TXCLK_ODLY << SCU_MICDS_MAC2RGMII_TXDLY_SHIFT);
+ struct ast2500_div_config div_cfg = {
+ .num = SCU_D2PLL_NUM_MASK >> SCU_D2PLL_NUM_SHIFT,
+ .denum = SCU_D2PLL_DENUM_MASK >> SCU_D2PLL_DENUM_SHIFT,
+ .post_div = SCU_D2PLL_POST_MASK >> SCU_D2PLL_POST_SHIFT,
+ };
+ ulong clkin = ast2500_get_clkin(scu);
+ ulong new_rate;
+
+ ast_scu_unlock(scu);
+ writel((d2_pll_ext_param << SCU_D2PLL_EXT1_PARAM_SHIFT)
+ | SCU_D2PLL_EXT1_OFF
+ | SCU_D2PLL_EXT1_RESET, &scu->d2_pll_ext_param[0]);
+
+ /*
+ * Select USB2.0 port1 PHY clock as a clock source for GCRT.
+ * This would disconnect it from D2-PLL.
+ */
+ clrsetbits_le32(&scu->misc_ctrl1, SCU_MISC_D2PLL_OFF,
+ SCU_MISC_GCRT_USB20CLK);
+
+ new_rate = ast2500_calc_clock_config(clkin, rate, &div_cfg);
+ writel((d2_pll_sip << SCU_D2PLL_SIP_SHIFT)
+ | (d2_pll_sic << SCU_D2PLL_SIC_SHIFT)
+ | (div_cfg.num << SCU_D2PLL_NUM_SHIFT)
+ | (div_cfg.denum << SCU_D2PLL_DENUM_SHIFT)
+ | (div_cfg.post_div << SCU_D2PLL_POST_SHIFT),
+ &scu->d2_pll_param);
+
+ clrbits_le32(&scu->d2_pll_ext_param[0],
+ SCU_D2PLL_EXT1_OFF | SCU_D2PLL_EXT1_RESET);
+
+ clrsetbits_le32(&scu->misc_ctrl2,
+ SCU_MISC2_RGMII_HPLL | SCU_MISC2_RMII_MPLL
+ | SCU_MISC2_RGMII_CLKDIV_MASK |
+ SCU_MISC2_RMII_CLKDIV_MASK,
+ (4 << SCU_MISC2_RMII_CLKDIV_SHIFT));
+
+ writel(clk_delay_settings | SCU_MICDS_RGMIIPLL, &scu->mac_clk_delay);
+ writel(clk_delay_settings, &scu->mac_clk_delay_100M);
+ writel(clk_delay_settings, &scu->mac_clk_delay_10M);
+
+ ast_scu_lock(scu);
+
+ return new_rate;
+}
+
static ulong ast2500_clk_set_rate(struct clk *clk, ulong rate)
{
struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
case MCLK_DDR:
new_rate = ast2500_configure_ddr(priv->scu, rate);
break;
+ case PLL_D2PLL:
+ new_rate = ast2500_configure_d2pll(priv->scu, rate);
+ break;
default:
return -ENOENT;
}
return new_rate;
}
+static int ast2500_clk_enable(struct clk *clk)
+{
+ struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
+
+ switch (clk->id) {
+ /*
+ * For MAC clocks the clock rate is
+ * configured based on whether RGMII or RMII mode has been selected
+ * through hardware strapping.
+ */
+ case PCLK_MAC1:
+ ast2500_configure_mac(priv->scu, 1);
+ break;
+ case PCLK_MAC2:
+ ast2500_configure_mac(priv->scu, 2);
+ break;
+ case PLL_D2PLL:
+ ast2500_configure_d2pll(priv->scu, D2PLL_DEFAULT_RATE);
+ default:
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
struct clk_ops ast2500_clk_ops = {
.get_rate = ast2500_clk_get_rate,
.set_rate = ast2500_clk_set_rate,
+ .enable = ast2500_clk_enable,
};
static int ast2500_clk_probe(struct udevice *dev)
{
struct ast2500_clk_priv *priv = dev_get_priv(dev);
- priv->scu = dev_get_addr_ptr(dev);
+ priv->scu = devfdt_get_addr_ptr(dev);
if (IS_ERR(priv->scu))
return PTR_ERR(priv->scu);
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