[U-Boot] [PATCH v1 14/19] driver: clk: Add support for clocks on Armada 37xx
Marek Behún
marek.behun at nic.cz
Wed Mar 7 21:52:11 UTC 2018
The drivers are based on Linux driver by Gregory Clement.
The TBG clocks support only the .get_rate method.
- since setting rate is not supported, the driver computes the rates
when probing and so subsequent calls to the .get_rate method do not
read the corresponding registers again
The peripheral clocks support methods .get_rate, .enable and .disable.
- the .set_parent method theoretically could be supported on some clocks
(the parent would have to be one of the TBG clocks)
- the .set_rate method would have to try all the divider values to find
the best approximation of a given rate, and it doesn't seem like
this should be needed in U-Boot, therefore not implemented
Signed-off-by: Marek Behun <marek.behun at nic.cz>
---
arch/arm/dts/armada-37xx.dtsi | 20 ++
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/mvebu/Kconfig | 11 +
drivers/clk/mvebu/Makefile | 1 +
drivers/clk/mvebu/armada-37xx-periph.c | 464 +++++++++++++++++++++++++++++++++
drivers/clk/mvebu/armada-37xx-tbg.c | 153 +++++++++++
7 files changed, 651 insertions(+)
diff --git a/arch/arm/dts/armada-37xx.dtsi b/arch/arm/dts/armada-37xx.dtsi
index d0529637f4..e848812fca 100644
--- a/arch/arm/dts/armada-37xx.dtsi
+++ b/arch/arm/dts/armada-37xx.dtsi
@@ -106,6 +106,26 @@
status = "disabled";
};
+ nb_periph_clk: nb-periph-clk at 13000 {
+ compatible = "marvell,armada-3700-periph-clock-nb";
+ reg = <0x13000 0x100>;
+ clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>, <&tbg 3>;
+ #clock-cells = <1>;
+ };
+
+ sb_periph_clk: sb-periph-clk at 18000 {
+ compatible = "marvell,armada-3700-periph-clock-sb";
+ reg = <0x18000 0x100>;
+ clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>, <&tbg 3>;
+ #clock-cells = <1>;
+ };
+
+ tbg: tbg at 13200 {
+ compatible = "marvell,armada-3700-tbg-clock";
+ reg = <0x13200 0x100>;
+ #clock-cells = <1>;
+ };
+
pinctrl_nb: pinctrl-nb at 13800 {
compatible = "marvell,armada3710-nb-pinctrl",
"syscon", "simple-mfd";
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index cdfa052c16..a40c8e5c8f 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -80,5 +80,6 @@ source "drivers/clk/uniphier/Kconfig"
source "drivers/clk/exynos/Kconfig"
source "drivers/clk/at91/Kconfig"
source "drivers/clk/renesas/Kconfig"
+source "drivers/clk/mvebu/Kconfig"
endmenu
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index dab106ab7f..094bcf5847 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -11,6 +11,7 @@ obj-y += tegra/
obj-$(CONFIG_ARCH_ASPEED) += aspeed/
obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
obj-$(CONFIG_CLK_AT91) += at91/
+obj-$(CONFIG_CLK_MVEBU) += mvebu/
obj-$(CONFIG_CLK_BCM6345) += clk_bcm6345.o
obj-$(CONFIG_CLK_BOSTON) += clk_boston.o
obj-$(CONFIG_CLK_EXYNOS) += exynos/
diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
new file mode 100644
index 0000000000..e776a15e7b
--- /dev/null
+++ b/drivers/clk/mvebu/Kconfig
@@ -0,0 +1,11 @@
+config CLK_MVEBU
+ bool "MVEBU clock drivers"
+ depends on CLK && ARCH_MVEBU
+ help
+ Enable support for clock present on Marvell MVEBU SoCs.
+
+config CLK_ARMADA_3720
+ bool "Marvell Armada 3720 clock driver"
+ depends on CLK_MVEBU && ARM64
+ help
+ Enable this to support the clocks on Marvell Armada 3720 SoC.
diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
new file mode 100644
index 0000000000..7f80313203
--- /dev/null
+++ b/drivers/clk/mvebu/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_CLK_ARMADA_3720) += armada-37xx-periph.o armada-37xx-tbg.o
diff --git a/drivers/clk/mvebu/armada-37xx-periph.c b/drivers/clk/mvebu/armada-37xx-periph.c
new file mode 100644
index 0000000000..94eabe5f19
--- /dev/null
+++ b/drivers/clk/mvebu/armada-37xx-periph.c
@@ -0,0 +1,464 @@
+/*
+ * Marvell Armada 37xx SoC Peripheral clocks
+ *
+ * Marek Behun <marek.behun at nic.cz>
+ *
+ * Based on Linux driver by:
+ * Gregory CLEMENT <gregory.clement at free-electrons.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <clk-uclass.h>
+#include <clk.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+
+#define TBG_SEL 0x0
+#define DIV_SEL0 0x4
+#define DIV_SEL1 0x8
+#define DIV_SEL2 0xC
+#define CLK_SEL 0x10
+#define CLK_DIS 0x14
+
+enum a37xx_periph_parent {
+ TBG_A_P = 0,
+ TBG_B_P = 1,
+ TBG_A_S = 2,
+ TBG_B_S = 3,
+ MAX_TBG_PARENTS = 4,
+ XTAL = 4,
+ MAX_PARENTS = 5,
+};
+
+static const struct {
+ const char *name;
+ enum a37xx_periph_parent parent;
+} a37xx_periph_parent_names[] = {
+ { "TBG-A-P", TBG_A_P },
+ { "TBG-B-P", TBG_B_P },
+ { "TBG-A-S", TBG_A_S },
+ { "TBG-B-S", TBG_B_S },
+ { "xtal" , XTAL },
+};
+
+struct clk_periph;
+
+struct a37xx_periphclk {
+ void __iomem *reg;
+
+ ulong parents[MAX_PARENTS];
+
+ const struct clk_periph *clks;
+ bool clk_has_periph_parent[16];
+ int clk_parent[16];
+
+ int count;
+};
+
+struct clk_div_table {
+ u32 div;
+ u32 val;
+};
+
+struct clk_periph {
+ const char *name;
+
+ const char *parent_name;
+
+ u32 disable_bit;
+ int mux_shift;
+
+ const struct clk_div_table *div_table[2];
+ s32 div_reg_off[2];
+ u32 div_mask[2];
+ int div_shift[2];
+
+ unsigned can_gate : 1;
+ unsigned can_mux : 1;
+ unsigned dividers : 2;
+};
+
+static const struct clk_div_table div_table1[] = {
+ { 1, 1 },
+ { 2, 2 },
+ { 0, 0 },
+};
+
+static const struct clk_div_table div_table2[] = {
+ { 2, 1 },
+ { 4, 2 },
+ { 0, 0 },
+};
+
+static const struct clk_div_table div_table6[] = {
+ { 1, 1 },
+ { 2, 2 },
+ { 3, 3 },
+ { 4, 4 },
+ { 5, 5 },
+ { 6, 6 },
+ { 0, 0 },
+};
+
+#define CLK_FULL_DD(_n, _d, _mux, _r0, _r1, _s0, _s1) \
+ { \
+ .name = #_n, \
+ .disable_bit = BIT(_d), \
+ .mux_shift = _mux, \
+ .div_table[0] = div_table6, \
+ .div_table[1] = div_table6, \
+ .div_reg_off[0] = _r0, \
+ .div_reg_off[1] = _r1, \
+ .div_shift[0] = _s0, \
+ .div_shift[1] = _s1, \
+ .div_mask[0] = 7, \
+ .div_mask[1] = 7, \
+ .can_gate = 1, \
+ .can_mux = 1, \
+ .dividers = 2, \
+ }
+
+#define CLK_FULL(_n, _d, _mux, _r, _s, _m, _t) \
+ { \
+ .name = #_n, \
+ .disable_bit = BIT(_d), \
+ .mux_shift = _mux, \
+ .div_table[0] = _t, \
+ .div_reg_off[0] = _r, \
+ .div_shift[0] = _s, \
+ .div_mask[0] = _m, \
+ .can_gate = 1, \
+ .can_mux = 1, \
+ .dividers = 1, \
+ }
+
+#define CLK_GATE_DIV(_n, _d, _r, _s, _m, _t, _p) \
+ { \
+ .name = #_n, \
+ .parent_name = _p, \
+ .disable_bit = BIT(_d), \
+ .div_table[0] = _t, \
+ .div_reg_off[0] = _r, \
+ .div_shift[0] = _s, \
+ .div_mask[0] = _m, \
+ .can_gate = 1, \
+ .dividers = 1, \
+ }
+
+#define CLK_GATE(_n, _d, _p) \
+ { \
+ .name = #_n, \
+ .parent_name = _p, \
+ .disable_bit = BIT(_d), \
+ .can_gate = 1, \
+ }
+
+#define CLK_MUX_DIV(_n, _mux, _r, _s, _m, _t) \
+ { \
+ .name = #_n, \
+ .mux_shift = _mux, \
+ .div_table[0] = _t, \
+ .div_reg_off[0] = _r, \
+ .div_shift[0] = _s, \
+ .div_mask[0] = _m, \
+ .can_mux = 1, \
+ .dividers = 1, \
+ }
+
+#define CLK_MUX_DD(_n, _mux, _r0, _r1, _s0, _s1) \
+ { \
+ .name = #_n, \
+ .mux_shift = _mux, \
+ .div_table[0] = div_table6, \
+ .div_table[1] = div_table6, \
+ .div_reg_off[0] = _r0, \
+ .div_reg_off[1] = _r1, \
+ .div_shift[0] = _s0, \
+ .div_shift[1] = _s1, \
+ .div_mask[0] = 7, \
+ .div_mask[1] = 7, \
+ .can_mux = 1, \
+ .dividers = 2, \
+ }
+
+/* NB periph clocks */
+static const struct clk_periph clks_nb[] ={
+ CLK_FULL_DD(mmc, 2, 0, DIV_SEL2, DIV_SEL2, 16, 13),
+ CLK_FULL_DD(sata_host, 3, 2, DIV_SEL2, DIV_SEL2, 10, 7),
+ CLK_FULL_DD(sec_at, 6, 4, DIV_SEL1, DIV_SEL1, 3, 0),
+ CLK_FULL_DD(sec_dap, 7, 6, DIV_SEL1, DIV_SEL1, 9, 6),
+ CLK_FULL_DD(tscem, 8, 8, DIV_SEL1, DIV_SEL1, 15, 12),
+ CLK_FULL(tscem_tmx, 10, 10, DIV_SEL1, 18, 7, div_table6),
+ CLK_GATE(avs, 11, "xtal"),
+ CLK_FULL_DD(sqf, 12, 12, DIV_SEL1, DIV_SEL1, 27, 24),
+ CLK_FULL_DD(pwm, 13, 14, DIV_SEL0, DIV_SEL0, 3, 0),
+ CLK_GATE(i2c_2, 16, "xtal"),
+ CLK_GATE(i2c_1, 17, "xtal"),
+ CLK_GATE_DIV(ddr_phy, 19, DIV_SEL0, 18, 1, div_table2, "TBG-A-S"),
+ CLK_FULL_DD(ddr_fclk, 21, 16, DIV_SEL0, DIV_SEL0, 15, 12),
+ CLK_FULL(trace, 22, 18, DIV_SEL0, 20, 7, div_table6),
+ CLK_FULL(counter, 23, 20, DIV_SEL0, 23, 7, div_table6),
+ CLK_FULL_DD(eip97, 24, 24, DIV_SEL2, DIV_SEL2, 22, 19),
+ CLK_MUX_DIV(cpu, 22, DIV_SEL0, 28, 7, div_table6),
+ { },
+};
+
+/* SB periph clocks */
+static const struct clk_periph clks_sb[] = {
+ CLK_MUX_DD(gbe_50, 6, DIV_SEL2, DIV_SEL2, 6, 9),
+ CLK_MUX_DD(gbe_core, 8, DIV_SEL1, DIV_SEL1, 18, 21),
+ CLK_MUX_DD(gbe_125, 10, DIV_SEL1, DIV_SEL1, 6, 9),
+ CLK_GATE(gbe1_50, 0, "gbe_50"),
+ CLK_GATE(gbe0_50, 1, "gbe_50"),
+ CLK_GATE(gbe1_125, 2, "gbe_125"),
+ CLK_GATE(gbe0_125, 3, "gbe_125"),
+ CLK_GATE_DIV(gbe1_core, 4, DIV_SEL1, 13, 1, div_table1, "gbe_core"),
+ CLK_GATE_DIV(gbe0_core, 5, DIV_SEL1, 14, 1, div_table1, "gbe_core"),
+ CLK_GATE_DIV(gbe_bm, 12, DIV_SEL1, 0, 1, div_table1, "gbe_core"),
+ CLK_FULL_DD(sdio, 11, 14, DIV_SEL0, DIV_SEL0, 3, 6),
+ CLK_FULL_DD(usb32_usb2_sys, 16, 16, DIV_SEL0, DIV_SEL0, 9, 12),
+ CLK_FULL_DD(usb32_ss_sys, 17, 18, DIV_SEL0, DIV_SEL0, 15, 18),
+ { },
+};
+
+static inline int get_mux(struct a37xx_periphclk *priv, int shift)
+{
+ return (readl(priv->reg + TBG_SEL) >> shift) & 3;
+}
+
+static ulong periph_clk_get_rate(struct a37xx_periphclk *priv, int id);
+
+static ulong get_parent_rate(struct a37xx_periphclk *priv, int id)
+{
+ const struct clk_periph *clk = &priv->clks[id];
+
+ if (clk->can_mux) {
+ /* parent is one of TBG clocks */
+ int tbg = get_mux(priv, clk->mux_shift);
+
+ return priv->parents[tbg];
+ } else if (priv->clk_has_periph_parent[id]) {
+ /* parent is one of other periph clocks */
+
+ if (priv->clk_parent[id] >= priv->count)
+ return -EINVAL;
+
+ return periph_clk_get_rate(priv, priv->clk_parent[id]);
+ } else {
+ /* otherwise parent is one of TBGs or XTAL */
+
+ if (priv->clk_parent[id] >= MAX_PARENTS)
+ return -EINVAL;
+
+ return priv->parents[priv->clk_parent[id]];
+ }
+}
+
+static ulong get_div(struct a37xx_periphclk *priv,
+ const struct clk_periph *clk, int idx)
+{
+ const struct clk_div_table *i;
+ u32 reg;
+
+ reg = readl(priv->reg + clk->div_reg_off[idx]);
+ reg = (reg >> clk->div_shift[idx]) & clk->div_mask[idx];
+
+ /* find divisor for register value val */
+ for (i = clk->div_table[idx]; i && i->div != 0; ++i)
+ if (i->val == reg)
+ return i->div;
+
+ return 0;
+}
+
+static ulong periph_clk_get_rate(struct a37xx_periphclk *priv, int id)
+{
+ const struct clk_periph *clk = &priv->clks[id];
+ ulong rate, div;
+ int i;
+
+ rate = get_parent_rate(priv, id);
+ if (rate == -EINVAL)
+ return -EINVAL;
+
+ /* divide the parent rate by dividers */
+ div = 1;
+ for (i = 0; i < clk->dividers; ++i)
+ div *= get_div(priv, clk, i);
+
+ if (!div)
+ return 0;
+
+ return DIV_ROUND_UP(rate, div);
+
+}
+
+static ulong armada_37xx_periph_clk_get_rate(struct clk *clk)
+{
+ struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
+
+ if (clk->id >= priv->count)
+ return -EINVAL;
+
+ return periph_clk_get_rate(priv, clk->id);
+}
+
+static int periph_clk_enable(struct clk *clk, int enable)
+{
+ struct a37xx_periphclk *priv = dev_get_priv(clk->dev);
+ const struct clk_periph *periph_clk = &priv->clks[clk->id];
+
+ if (clk->id >= priv->count)
+ return -EINVAL;
+
+ if (!periph_clk->can_gate)
+ return -ENOTSUPP;
+
+ if (enable)
+ clrbits_le32(priv->reg + CLK_DIS, periph_clk->disable_bit);
+ else
+ setbits_le32(priv->reg + CLK_DIS, periph_clk->disable_bit);
+
+ return 0;
+}
+
+static int armada_37xx_periph_clk_enable(struct clk *clk)
+{
+ return periph_clk_enable(clk, 1);
+}
+
+static int armada_37xx_periph_clk_disable(struct clk *clk)
+{
+ return periph_clk_enable(clk, 0);
+}
+
+int armada_37xx_periph_clk_dump(struct udevice *dev)
+{
+ struct a37xx_periphclk *priv = dev_get_priv(dev);
+ const struct clk_periph *clks;
+ int i;
+
+ if (!priv)
+ return -ENODEV;
+
+ clks = priv->clks;
+
+ for (i = 0; i < priv->count; ++i)
+ printf(" %s at %lu Hz\n", clks[i].name,
+ periph_clk_get_rate(priv, i));
+ printf("\n");
+
+ return 0;
+}
+
+static int armada_37xx_periph_clk_probe(struct udevice *dev)
+{
+ struct a37xx_periphclk *priv = dev_get_priv(dev);
+ const struct clk_periph *clks;
+ int ret, i;
+
+ clks = (const struct clk_periph *) dev_get_driver_data(dev);
+ if (!clks)
+ return -ENODEV;
+
+ priv->reg = dev_read_addr_ptr(dev);
+ if (!priv->reg) {
+ dev_err(dev, "no io address\n");
+ return -ENODEV;
+ }
+
+ /* count clk_periph nodes */
+ priv->count = 0;
+ while (clks[priv->count].name)
+ priv->count++;
+
+ priv->clks = clks;
+
+ /* assign parent IDs to nodes which have non-NULL parent_name */
+ for (i = 0; i < priv->count; ++i) {
+ int j;
+
+ if (!clks[i].parent_name)
+ continue;
+
+ /* first try if parent_name is one of TBGs or XTAL */
+ for (j = 0; j < MAX_PARENTS; ++j)
+ if (!strcmp(clks[i].parent_name,
+ a37xx_periph_parent_names[j].name))
+ break;
+
+ if (j < MAX_PARENTS) {
+ priv->clk_has_periph_parent[i] = false;
+ priv->clk_parent[i] =
+ a37xx_periph_parent_names[j].parent;
+ continue;
+ }
+
+ /* else parent_name should be one of other periph clocks */
+ for (j = 0; j < priv->count; ++j) {
+ if (!strcmp(clks[i].parent_name, clks[j].name))
+ break;
+ }
+
+ if (j < priv->count) {
+ priv->clk_has_periph_parent[i] = true;
+ priv->clk_parent[i] = j;
+ continue;
+ }
+
+ dev_err(dev, "undefined parent %s\n", clks[i].parent_name);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < MAX_PARENTS; ++i) {
+ struct clk clk;
+
+ if (i == XTAL) {
+ priv->parents[i] = get_ref_clk() * 1000000;
+ continue;
+ }
+
+ ret = clk_get_by_index(dev, i, &clk);
+ if (ret) {
+ dev_err(dev, "one of parent clocks (%i) missing: %i\n",
+ i, ret);
+ return -ENODEV;
+ }
+
+ priv->parents[i] = clk_get_rate(&clk);
+ clk_free(&clk);
+ }
+
+ return 0;
+}
+
+static const struct clk_ops armada_37xx_periph_clk_ops = {
+ .get_rate = armada_37xx_periph_clk_get_rate,
+ .enable = armada_37xx_periph_clk_enable,
+ .disable = armada_37xx_periph_clk_disable,
+};
+
+static const struct udevice_id armada_37xx_periph_clk_ids[] = {
+ {
+ .compatible = "marvell,armada-3700-periph-clock-nb",
+ .data = (ulong) clks_nb,
+ },
+ {
+ .compatible = "marvell,armada-3700-periph-clock-sb",
+ .data = (ulong) clks_sb,
+ },
+ {}
+};
+
+U_BOOT_DRIVER(armada_37xx_periph_clk) = {
+ .name = "armada_37xx_periph_clk",
+ .id = UCLASS_CLK,
+ .of_match = armada_37xx_periph_clk_ids,
+ .ops = &armada_37xx_periph_clk_ops,
+ .priv_auto_alloc_size = sizeof(struct a37xx_periphclk),
+ .probe = armada_37xx_periph_clk_probe,
+};
diff --git a/drivers/clk/mvebu/armada-37xx-tbg.c b/drivers/clk/mvebu/armada-37xx-tbg.c
new file mode 100644
index 0000000000..e8c654f1a6
--- /dev/null
+++ b/drivers/clk/mvebu/armada-37xx-tbg.c
@@ -0,0 +1,153 @@
+/*
+ * Marvell Armada 37xx SoC Time Base Generator clocks
+ *
+ * Marek Behun <marek.behun at nic.cz>
+ *
+ * Based on Linux driver by:
+ * Gregory CLEMENT <gregory.clement at free-electrons.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <clk.h>
+#include <dm.h>
+#include <asm/io.h>
+#include <asm/arch/cpu.h>
+
+#define NUM_TBG 4
+
+#define TBG_CTRL0 0x4
+#define TBG_CTRL1 0x8
+#define TBG_CTRL7 0x20
+#define TBG_CTRL8 0x30
+
+#define TBG_DIV_MASK 0x1FF
+
+#define TBG_A_REFDIV 0
+#define TBG_B_REFDIV 16
+
+#define TBG_A_FBDIV 2
+#define TBG_B_FBDIV 18
+
+#define TBG_A_VCODIV_SE 0
+#define TBG_B_VCODIV_SE 16
+
+#define TBG_A_VCODIV_DIFF 1
+#define TBG_B_VCODIV_DIFF 17
+
+struct tbg_def {
+ const char *name;
+ u32 refdiv_offset;
+ u32 fbdiv_offset;
+ u32 vcodiv_reg;
+ u32 vcodiv_offset;
+};
+
+static const struct tbg_def tbg[NUM_TBG] = {
+ {"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF},
+ {"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8, TBG_B_VCODIV_DIFF},
+ {"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SE},
+ {"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SE},
+};
+
+struct a37xx_tbgclk {
+ ulong rates[NUM_TBG];
+ unsigned int mult[NUM_TBG];
+ unsigned int div[NUM_TBG];
+};
+
+static unsigned int tbg_get_mult(void __iomem *reg, const struct tbg_def *ptbg)
+{
+ u32 val;
+
+ val = readl(reg + TBG_CTRL0);
+
+ return ((val >> ptbg->fbdiv_offset) & TBG_DIV_MASK) << 2;
+}
+
+static unsigned int tbg_get_div(void __iomem *reg, const struct tbg_def *ptbg)
+{
+ u32 val;
+ unsigned int div;
+
+ val = readl(reg + TBG_CTRL7);
+
+ div = (val >> ptbg->refdiv_offset) & TBG_DIV_MASK;
+ if (div == 0)
+ div = 1;
+ val = readl(reg + ptbg->vcodiv_reg);
+
+ div *= 1 << ((val >> ptbg->vcodiv_offset) & TBG_DIV_MASK);
+
+ return div;
+}
+
+static ulong armada_37xx_tbg_clk_get_rate(struct clk *clk)
+{
+ struct a37xx_tbgclk *priv = dev_get_priv(clk->dev);
+
+ if (clk->id >= NUM_TBG)
+ return -ENODEV;
+
+ return priv->rates[clk->id];
+}
+
+int armada_37xx_tbg_clk_dump(struct udevice *dev)
+{
+ struct a37xx_tbgclk *priv = dev_get_priv(dev);
+ int i;
+
+ for (i = 0; i < NUM_TBG; ++i)
+ printf(" %s at %lu Hz\n", tbg[i].name,
+ priv->rates[i]);
+ printf("\n");
+
+ return 0;
+}
+
+static int armada_37xx_tbg_clk_probe(struct udevice *dev)
+{
+ struct a37xx_tbgclk *priv = dev_get_priv(dev);
+ void __iomem *reg;
+ ulong xtal;
+ int i;
+
+ reg = dev_read_addr_ptr(dev);
+ if (!reg) {
+ dev_err(dev, "no io address\n");
+ return -ENODEV;
+ }
+
+ xtal = (ulong) get_ref_clk() * 1000000;
+
+ for (i = 0; i < NUM_TBG; ++i) {
+ unsigned int mult, div;
+
+ mult = tbg_get_mult(reg, &tbg[i]);
+ div = tbg_get_div(reg, &tbg[i]);
+
+ priv->rates[i] = (xtal * mult) / div;
+ }
+
+ return 0;
+}
+
+static const struct clk_ops armada_37xx_tbg_clk_ops = {
+ .get_rate = armada_37xx_tbg_clk_get_rate,
+};
+
+static const struct udevice_id armada_37xx_tbg_clk_ids[] = {
+ { .compatible = "marvell,armada-3700-tbg-clock" },
+ {}
+};
+
+U_BOOT_DRIVER(armada_37xx_tbg_clk) = {
+ .name = "armada_37xx_tbg_clk",
+ .id = UCLASS_CLK,
+ .of_match = armada_37xx_tbg_clk_ids,
+ .ops = &armada_37xx_tbg_clk_ops,
+ .priv_auto_alloc_size = sizeof(struct a37xx_tbgclk),
+ .probe = armada_37xx_tbg_clk_probe,
+};
--
2.16.1
More information about the U-Boot
mailing list