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Diffstat (limited to 'roms/u-boot/drivers/clk/aspeed/clk_ast2500.c')
-rw-r--r--roms/u-boot/drivers/clk/aspeed/clk_ast2500.c531
1 files changed, 531 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/clk/aspeed/clk_ast2500.c b/roms/u-boot/drivers/clk/aspeed/clk_ast2500.c
new file mode 100644
index 000000000..97f00f505
--- /dev/null
+++ b/roms/u-boot/drivers/clk/aspeed/clk_ast2500.c
@@ -0,0 +1,531 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2016 Google, Inc
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <log.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <asm/arch/scu_ast2500.h>
+#include <dm/lists.h>
+#include <dt-bindings/clock/aspeed-clock.h>
+#include <linux/delay.h>
+#include <linux/err.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
+ * the value of the M-PLL Parameter Register.
+ */
+static ulong ast2500_get_mpll_rate(ulong clkin, u32 mpll_reg)
+{
+ 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 + 1);
+}
+
+/*
+ * Get the rate of the H-PLL clock from input clock frequency and
+ * the value of the H-PLL Parameter Register.
+ */
+static ulong ast2500_get_hpll_rate(ulong clkin, u32 hpll_reg)
+{
+ 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 + 1);
+}
+
+static ulong ast2500_get_clkin(struct ast2500_scu *scu)
+{
+ return readl(&scu->hwstrap) & SCU_HWSTRAP_CLKIN_25MHZ
+ ? 25 * 1000 * 1000 : 24 * 1000 * 1000;
+}
+
+/**
+ * Get current rate or uart clock
+ *
+ * @scu SCU registers
+ * @uart_index UART index, 1-5
+ *
+ * @return current setting for uart clock rate
+ */
+static ulong ast2500_get_uart_clk_rate(struct ast2500_scu *scu, int uart_index)
+{
+ /*
+ * ast2500 datasheet is very confusing when it comes to UART clocks,
+ * especially when CLKIN = 25 MHz. The settings are in
+ * different registers and it is unclear how they interact.
+ *
+ * This has only been tested with default settings and CLKIN = 24 MHz.
+ */
+ ulong uart_clkin;
+
+ if (readl(&scu->misc_ctrl2) &
+ (1 << (uart_index - 1 + SCU_MISC2_UARTCLK_SHIFT)))
+ uart_clkin = 192 * 1000 * 1000;
+ else
+ uart_clkin = 24 * 1000 * 1000;
+
+ if (readl(&scu->misc_ctrl1) & SCU_MISC_UARTCLK_DIV13)
+ uart_clkin /= 13;
+
+ return uart_clkin;
+}
+
+static ulong ast2500_clk_get_rate(struct clk *clk)
+{
+ struct ast2500_clk_priv *priv = dev_get_priv(clk->dev);
+ ulong clkin = ast2500_get_clkin(priv->scu);
+ ulong rate;
+
+ switch (clk->id) {
+ case ASPEED_CLK_HPLL:
+ /*
+ * This ignores dynamic/static slowdown of ARMCLK and may
+ * be inaccurate.
+ */
+ rate = ast2500_get_hpll_rate(clkin,
+ readl(&priv->scu->h_pll_param));
+ break;
+ case ASPEED_CLK_MPLL:
+ rate = ast2500_get_mpll_rate(clkin,
+ readl(&priv->scu->m_pll_param));
+ break;
+ case ASPEED_CLK_APB:
+ {
+ 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 ASPEED_CLK_SDIO:
+ {
+ ulong apb_div = 4 + 4 * ((readl(&priv->scu->clk_sel1)
+ & SCU_SDCLK_DIV_MASK)
+ >> SCU_SDCLK_DIV_SHIFT);
+ rate = ast2500_get_hpll_rate(clkin,
+ readl(&priv->
+ scu->h_pll_param));
+ rate = rate / apb_div;
+ }
+ break;
+ case ASPEED_CLK_GATE_UART1CLK:
+ rate = ast2500_get_uart_clk_rate(priv->scu, 1);
+ break;
+ case ASPEED_CLK_GATE_UART2CLK:
+ rate = ast2500_get_uart_clk_rate(priv->scu, 2);
+ break;
+ case ASPEED_CLK_GATE_UART3CLK:
+ rate = ast2500_get_uart_clk_rate(priv->scu, 3);
+ break;
+ case ASPEED_CLK_GATE_UART4CLK:
+ rate = ast2500_get_uart_clk_rate(priv->scu, 4);
+ break;
+ case ASPEED_CLK_GATE_UART5CLK:
+ rate = ast2500_get_uart_clk_rate(priv->scu, 5);
+ break;
+ default:
+ return -ENOENT;
+ }
+
+ return rate;
+}
+
+struct ast2500_clock_config {
+ ulong input_rate;
+ ulong rate;
+ struct ast2500_div_config cfg;
+};
+
+static const struct ast2500_clock_config ast2500_clock_config_defaults[] = {
+ { 24000000, 250000000, { .num = 124, .denum = 1, .post_div = 5 } },
+};
+
+static bool ast2500_get_clock_config_default(ulong input_rate,
+ ulong requested_rate,
+ struct ast2500_div_config *cfg)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ast2500_clock_config_defaults); i++) {
+ const struct ast2500_clock_config *default_cfg =
+ &ast2500_clock_config_defaults[i];
+ if (default_cfg->input_rate == input_rate &&
+ default_cfg->rate == requested_rate) {
+ *cfg = default_cfg->cfg;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*
+ * @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)
+{
+ /*
+ * The assumption is that kHz precision is good enough and
+ * also enough to avoid overflow when multiplying.
+ */
+ 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;
+
+ /*
+ * Look for a well known frequency first.
+ */
+ if (ast2500_get_clock_config_default(input_rate, requested_rate, cfg))
+ return requested_rate;
+
+ 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)
+ continue;
+
+ if (new_rate_khz - rate_khz < delta) {
+ delta = new_rate_khz - rate_khz;
+ *cfg = it;
+ if (delta == 0)
+ return new_rate_khz * 1000;
+ }
+ }
+ }
+
+ 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_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);
+ 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.
+ *
+ * TODO(clg@kaod.org): the SIP and SIC values depend on the
+ * Numerator value
+ */
+ 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);
+
+ ulong new_rate;
+ switch (clk->id) {
+ case ASPEED_CLK_MPLL:
+ new_rate = ast2500_configure_ddr(priv->scu, rate);
+ break;
+ case ASPEED_CLK_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) {
+ case ASPEED_CLK_SDIO:
+ if (readl(&priv->scu->clk_stop_ctrl1) & SCU_CLKSTOP_SDCLK) {
+ ast_scu_unlock(priv->scu);
+
+ setbits_le32(&priv->scu->sysreset_ctrl1,
+ SCU_SYSRESET_SDIO);
+ udelay(100);
+ clrbits_le32(&priv->scu->clk_stop_ctrl1,
+ SCU_CLKSTOP_SDCLK);
+ mdelay(10);
+ clrbits_le32(&priv->scu->sysreset_ctrl1,
+ SCU_SYSRESET_SDIO);
+
+ ast_scu_lock(priv->scu);
+ }
+ break;
+ /*
+ * For MAC clocks the clock rate is
+ * configured based on whether RGMII or RMII mode has been selected
+ * through hardware strapping.
+ */
+ case ASPEED_CLK_GATE_MAC1CLK:
+ ast2500_configure_mac(priv->scu, 1);
+ break;
+ case ASPEED_CLK_GATE_MAC2CLK:
+ ast2500_configure_mac(priv->scu, 2);
+ break;
+ case ASPEED_CLK_D2PLL:
+ ast2500_configure_d2pll(priv->scu, D2PLL_DEFAULT_RATE);
+ break;
+ 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_of_to_plat(struct udevice *dev)
+{
+ struct ast2500_clk_priv *priv = dev_get_priv(dev);
+
+ priv->scu = devfdt_get_addr_ptr(dev);
+ if (IS_ERR(priv->scu))
+ return PTR_ERR(priv->scu);
+
+ return 0;
+}
+
+static int ast2500_clk_bind(struct udevice *dev)
+{
+ int ret;
+
+ /* The reset driver does not have a device node, so bind it here */
+ ret = device_bind_driver(gd->dm_root, "ast_sysreset", "reset", &dev);
+ if (ret)
+ debug("Warning: No reset driver: ret=%d\n", ret);
+
+ return 0;
+}
+
+static const struct udevice_id ast2500_clk_ids[] = {
+ { .compatible = "aspeed,ast2500-scu" },
+ { }
+};
+
+U_BOOT_DRIVER(aspeed_ast2500_scu) = {
+ .name = "aspeed_ast2500_scu",
+ .id = UCLASS_CLK,
+ .of_match = ast2500_clk_ids,
+ .priv_auto = sizeof(struct ast2500_clk_priv),
+ .ops = &ast2500_clk_ops,
+ .bind = ast2500_clk_bind,
+ .of_to_plat = ast2500_clk_of_to_plat,
+};