[PATCH] clk: clk_versaclock: Add support for versaclock driver
Adam Ford
aford173 at gmail.com
Mon May 24 19:53:28 CEST 2021
The driver is based on the Versaclock driver from the Linux code, but
do differences in the clock API between them, some pieces had to change.
This driver creates a mux, pfd, pll, and a series of fod ouputs.
Rate Usecnt Name
------------------------------------------
25000000 0 `-- x304-clock
25000000 0 `-- clock-controller at 6a.mux
25000000 0 |-- clock-controller at 6a.pfd
2800000000 0 | `-- clock-controller at 6a.pll
33333333 0 | |-- clock-controller at 6a.fod0
33333333 0 | | `-- clock-controller at 6a.out1
33333333 0 | |-- clock-controller at 6a.fod1
33333333 0 | | `-- clock-controller at 6a.out2
50000000 0 | |-- clock-controller at 6a.fod2
50000000 0 | | `-- clock-controller at 6a.out3
125000000 0 | `-- clock-controller at 6a.fod3
125000000 0 | `-- clock-controller at 6a.out4
25000000 0 `-- clock-controller at 6a.out0_sel_i2cb
A translation function is added so the references to <&versaclock X> get routed
to the corresponding clock-controller at 6a.outX.
Signed-off-by: Adam Ford <aford173 at gmail.com>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 40a5a5dd88..75adccc138 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -197,4 +197,12 @@ config SANDBOX_CLK_CCF
Enable this option if you want to test the Linux kernel's Common
Clock Framework [CCF] code in U-Boot's Sandbox clock driver.
+config CLK_VERSACLOCK
+ tristate "Enable VersaClock 5/6 devices"
+ depends on CLK
+ depends on OF_CONTROL
+ help
+ This driver supports the IDT VersaClock 5 and VersaClock 6
+ programmable clock generators.
+
endmenu
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 645709b855..2a9ebec860 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -51,3 +51,4 @@ obj-$(CONFIG_SANDBOX_CLK_CCF) += clk_sandbox_ccf.o
obj-$(CONFIG_STM32H7) += clk_stm32h7.o
obj-$(CONFIG_CLK_VERSAL) += clk_versal.o
obj-$(CONFIG_CLK_CDCE9XX) += clk-cdce9xx.o
+obj-$(CONFIG_CLK_VERSACLOCK) +=clk_versaclock.o
diff --git a/drivers/clk/clk_versaclock.c b/drivers/clk/clk_versaclock.c
new file mode 100644
index 0000000000..30e49fad31
--- /dev/null
+++ b/drivers/clk/clk_versaclock.c
@@ -0,0 +1,1025 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for IDT Versaclock 5/6
+ *
+ * Derived from code Copyright (C) 2017 Marek Vasut <marek.vasut at gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <errno.h>
+#include <i2c.h>
+#include <dm/device_compat.h>
+#include <log.h>
+#include <linux/clk-provider.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+
+#include <dt-bindings/clk/versaclock.h>
+
+/* VersaClock5 registers */
+#define VC5_OTP_CONTROL 0x00
+
+/* Factory-reserved register block */
+#define VC5_RSVD_DEVICE_ID 0x01
+#define VC5_RSVD_ADC_GAIN_7_0 0x02
+#define VC5_RSVD_ADC_GAIN_15_8 0x03
+#define VC5_RSVD_ADC_OFFSET_7_0 0x04
+#define VC5_RSVD_ADC_OFFSET_15_8 0x05
+#define VC5_RSVD_TEMPY 0x06
+#define VC5_RSVD_OFFSET_TBIN 0x07
+#define VC5_RSVD_GAIN 0x08
+#define VC5_RSVD_TEST_NP 0x09
+#define VC5_RSVD_UNUSED 0x0a
+#define VC5_RSVD_BANDGAP_TRIM_UP 0x0b
+#define VC5_RSVD_BANDGAP_TRIM_DN 0x0c
+#define VC5_RSVD_CLK_R_12_CLK_AMP_4 0x0d
+#define VC5_RSVD_CLK_R_34_CLK_AMP_4 0x0e
+#define VC5_RSVD_CLK_AMP_123 0x0f
+
+/* Configuration register block */
+#define VC5_PRIM_SRC_SHDN 0x10
+#define VC5_PRIM_SRC_SHDN_EN_XTAL BIT(7)
+#define VC5_PRIM_SRC_SHDN_EN_CLKIN BIT(6)
+#define VC5_PRIM_SRC_SHDN_EN_DOUBLE_XTAL_FREQ BIT(3)
+#define VC5_PRIM_SRC_SHDN_SP BIT(1)
+#define VC5_PRIM_SRC_SHDN_EN_GBL_SHDN BIT(0)
+
+#define VC5_VCO_BAND 0x11
+#define VC5_XTAL_X1_LOAD_CAP 0x12
+#define VC5_XTAL_X2_LOAD_CAP 0x13
+#define VC5_REF_DIVIDER 0x15
+#define VC5_REF_DIVIDER_SEL_PREDIV2 BIT(7)
+#define VC5_REF_DIVIDER_REF_DIV(n) ((n) & 0x3f)
+
+#define VC5_VCO_CTRL_AND_PREDIV 0x16
+#define VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV BIT(7)
+
+#define VC5_FEEDBACK_INT_DIV 0x17
+#define VC5_FEEDBACK_INT_DIV_BITS 0x18
+#define VC5_FEEDBACK_FRAC_DIV(n) (0x19 + (n))
+#define VC5_RC_CONTROL0 0x1e
+#define VC5_RC_CONTROL1 0x1f
+/* Register 0x20 is factory reserved */
+
+/* Output divider control for divider 1,2,3,4 */
+#define VC5_OUT_DIV_CONTROL(idx) (0x21 + ((idx) * 0x10))
+#define VC5_OUT_DIV_CONTROL_RESET BIT(7)
+#define VC5_OUT_DIV_CONTROL_SELB_NORM BIT(3)
+#define VC5_OUT_DIV_CONTROL_SEL_EXT BIT(2)
+#define VC5_OUT_DIV_CONTROL_INT_MODE BIT(1)
+#define VC5_OUT_DIV_CONTROL_EN_FOD BIT(0)
+
+#define VC5_OUT_DIV_FRAC(idx, n) (0x22 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_FRAC4_OD_SCEE BIT(1)
+
+#define VC5_OUT_DIV_STEP_SPREAD(idx, n) (0x26 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SPREAD_MOD(idx, n) (0x29 + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SKEW_INT(idx, n) (0x2b + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_INT(idx, n) (0x2d + ((idx) * 0x10) + (n))
+#define VC5_OUT_DIV_SKEW_FRAC(idx) (0x2f + ((idx) * 0x10))
+/* Registers 0x30, 0x40, 0x50 are factory reserved */
+
+/* Clock control register for clock 1,2 */
+#define VC5_CLK_OUTPUT_CFG(idx, n) (0x60 + ((idx) * 0x2) + (n))
+#define VC5_CLK_OUTPUT_CFG0_CFG_SHIFT 5
+#define VC5_CLK_OUTPUT_CFG0_CFG_MASK GENMASK(7, VC5_CLK_OUTPUT_CFG0_CFG_SHIFT)
+
+#define VC5_CLK_OUTPUT_CFG0_CFG_LVPECL (VC5_LVPECL)
+#define VC5_CLK_OUTPUT_CFG0_CFG_CMOS (VC5_CMOS)
+#define VC5_CLK_OUTPUT_CFG0_CFG_HCSL33 (VC5_HCSL33)
+#define VC5_CLK_OUTPUT_CFG0_CFG_LVDS (VC5_LVDS)
+#define VC5_CLK_OUTPUT_CFG0_CFG_CMOS2 (VC5_CMOS2)
+#define VC5_CLK_OUTPUT_CFG0_CFG_CMOSD (VC5_CMOSD)
+#define VC5_CLK_OUTPUT_CFG0_CFG_HCSL25 (VC5_HCSL25)
+
+#define VC5_CLK_OUTPUT_CFG0_PWR_SHIFT 3
+#define VC5_CLK_OUTPUT_CFG0_PWR_MASK GENMASK(4, VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_PWR_18 (0 << VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_PWR_25 (2 << VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_PWR_33 (3 << VC5_CLK_OUTPUT_CFG0_PWR_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT 0
+#define VC5_CLK_OUTPUT_CFG0_SLEW_MASK GENMASK(1, VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_SLEW_80 (0 << VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_SLEW_85 (1 << VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_SLEW_90 (2 << VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
+#define VC5_CLK_OUTPUT_CFG0_SLEW_100 (3 << VC5_CLK_OUTPUT_CFG0_SLEW_SHIFT)
+#define VC5_CLK_OUTPUT_CFG1_EN_CLKBUF BIT(0)
+
+#define VC5_CLK_OE_SHDN 0x68
+#define VC5_CLK_OS_SHDN 0x69
+
+#define VC5_GLOBAL_REGISTER 0x76
+#define VC5_GLOBAL_REGISTER_GLOBAL_RESET BIT(5)
+
+/* PLL/VCO runs between 2.5 GHz and 3.0 GHz */
+#define VC5_PLL_VCO_MIN 2500000000UL
+#define VC5_PLL_VCO_MAX 3000000000UL
+
+/* VC5 Input mux settings */
+#define VC5_MUX_IN_XIN BIT(0)
+#define VC5_MUX_IN_CLKIN BIT(1)
+
+/* Maximum number of clk_out supported by this driver */
+#define VC5_MAX_CLK_OUT_NUM 5
+
+/* Maximum number of FODs supported by this driver */
+#define VC5_MAX_FOD_NUM 4
+
+/* flags to describe chip features */
+/* chip has built-in oscilator */
+#define VC5_HAS_INTERNAL_XTAL BIT(0)
+/* chip has PFD requency doubler */
+#define VC5_HAS_PFD_FREQ_DBL BIT(1)
+
+/* Supported IDT VC5 models. */
+enum vc5_model {
+ IDT_VC5_5P49V5923,
+ IDT_VC5_5P49V5925,
+ IDT_VC5_5P49V5933,
+ IDT_VC5_5P49V5935,
+ IDT_VC6_5P49V6901,
+ IDT_VC6_5P49V6965,
+};
+
+/* Structure to describe features of a particular VC5 model */
+struct vc5_chip_info {
+ const enum vc5_model model;
+ const unsigned int clk_fod_cnt;
+ const unsigned int clk_out_cnt;
+ const u32 flags;
+};
+
+struct vc5_driver_data;
+
+struct vc5_hw_data {
+ struct clk hw;
+ struct vc5_driver_data *vc5;
+ u32 div_int;
+ u32 div_frc;
+ unsigned int num;
+};
+
+struct vc5_out_data {
+ struct clk hw;
+ struct vc5_driver_data *vc5;
+ unsigned int num;
+ unsigned int clk_output_cfg0;
+ unsigned int clk_output_cfg0_mask;
+};
+
+struct vc5_driver_data {
+ struct udevice *i2c;
+ const struct vc5_chip_info *chip_info;
+
+ struct clk *pin_xin;
+ struct clk *pin_clkin;
+ unsigned char clk_mux_ins;
+ struct clk clk_mux;
+ struct clk clk_mul;
+ struct clk clk_pfd;
+ struct vc5_hw_data clk_pll;
+ struct vc5_hw_data clk_fod[VC5_MAX_FOD_NUM];
+ struct vc5_out_data clk_out[VC5_MAX_CLK_OUT_NUM];
+};
+
+static const struct vc5_chip_info idt_5p49v5923_info = {
+ .model = IDT_VC5_5P49V5923,
+ .clk_fod_cnt = 2,
+ .clk_out_cnt = 3,
+ .flags = 0,
+};
+
+static const struct vc5_chip_info idt_5p49v5925_info = {
+ .model = IDT_VC5_5P49V5925,
+ .clk_fod_cnt = 4,
+ .clk_out_cnt = 5,
+ .flags = 0,
+};
+
+static const struct vc5_chip_info idt_5p49v5933_info = {
+ .model = IDT_VC5_5P49V5933,
+ .clk_fod_cnt = 2,
+ .clk_out_cnt = 3,
+ .flags = VC5_HAS_INTERNAL_XTAL,
+};
+
+static const struct vc5_chip_info idt_5p49v5935_info = {
+ .model = IDT_VC5_5P49V5935,
+ .clk_fod_cnt = 4,
+ .clk_out_cnt = 5,
+ .flags = VC5_HAS_INTERNAL_XTAL,
+};
+
+static const struct vc5_chip_info idt_5p49v6901_info = {
+ .model = IDT_VC6_5P49V6901,
+ .clk_fod_cnt = 4,
+ .clk_out_cnt = 5,
+ .flags = VC5_HAS_PFD_FREQ_DBL,
+};
+
+static const struct vc5_chip_info idt_5p49v6965_info = {
+ .model = IDT_VC6_5P49V6965,
+ .clk_fod_cnt = 4,
+ .clk_out_cnt = 5,
+ .flags = 0,
+};
+
+static int vc5_update_bits(struct udevice *dev, unsigned int reg, unsigned int mask,
+ unsigned int src)
+{
+ int ret;
+ unsigned char cache;
+
+ ret = dm_i2c_read(dev, reg, &cache, 1);
+ if (ret < 0)
+ return ret;
+
+ cache &= ~mask;
+ cache |= mask & src;
+ ret = dm_i2c_write(dev, reg, (uchar *)&cache, 1);
+
+ return ret;
+}
+
+static unsigned long vc5_mux_get_rate(struct clk *hw)
+{
+ return clk_get_rate(clk_get_parent(hw));
+}
+
+static int vc5_mux_set_parent(struct clk *hw, unsigned char index)
+{
+ struct vc5_driver_data *vc5 = container_of(hw, struct vc5_driver_data, clk_mux);
+ const u8 mask = VC5_PRIM_SRC_SHDN_EN_XTAL | VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ u8 src;
+
+ if (index > 1 || !vc5->clk_mux_ins)
+ return -EINVAL;
+
+ if (vc5->clk_mux_ins == (VC5_MUX_IN_CLKIN | VC5_MUX_IN_XIN)) {
+ if (index == 0)
+ src = VC5_PRIM_SRC_SHDN_EN_XTAL;
+ if (index == 1)
+ src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ } else {
+ if (index != 0)
+ return -EINVAL;
+
+ if (vc5->clk_mux_ins == VC5_MUX_IN_XIN)
+ src = VC5_PRIM_SRC_SHDN_EN_XTAL;
+ else if (vc5->clk_mux_ins == VC5_MUX_IN_CLKIN)
+ src = VC5_PRIM_SRC_SHDN_EN_CLKIN;
+ else /* Invalid; should have been caught by vc5_probe() */
+ return -EINVAL;
+ }
+
+ return vc5_update_bits(vc5->i2c, VC5_PRIM_SRC_SHDN, mask, src);
+}
+
+static const struct clk_ops vc5_mux_ops = {
+ .get_rate = vc5_mux_get_rate,
+};
+
+static unsigned long vc5_pfd_round_rate(struct clk *hw, unsigned long rate)
+{
+ struct clk *clk_parent = clk_get_parent(hw);
+ unsigned long parent_rate = clk_get_rate(clk_parent);
+ unsigned long idiv;
+
+ /* PLL cannot operate with input clock above 50 MHz. */
+ if (rate > 50000000)
+ return -EINVAL;
+
+ /* CLKIN within range of PLL input, feed directly to PLL. */
+ if (parent_rate <= 50000000)
+ return parent_rate;
+
+ idiv = DIV_ROUND_UP(parent_rate, rate);
+ if (idiv > 127)
+ return -EINVAL;
+
+ return parent_rate / idiv;
+}
+
+static unsigned long vc5_pfd_recalc_rate(struct clk *hw)
+{
+ struct vc5_driver_data *vc5 =
+ container_of(hw, struct vc5_driver_data, clk_pfd);
+ unsigned int prediv, div;
+ struct clk *clk_parent = clk_get_parent(hw);
+ unsigned long parent_rate = clk_get_rate(clk_parent);
+
+ dm_i2c_read(vc5->i2c, VC5_VCO_CTRL_AND_PREDIV, (uchar *)&prediv, 1);
+
+ /* The bypass_prediv is set, PLL fed from Ref_in directly. */
+ if (prediv & VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV)
+ return parent_rate;
+
+ dm_i2c_read(vc5->i2c, VC5_REF_DIVIDER, (uchar *)&div, 1);
+
+ /* The Sel_prediv2 is set, PLL fed from prediv2 (Ref_in / 2) */
+ if (div & VC5_REF_DIVIDER_SEL_PREDIV2)
+ return parent_rate / 2;
+ else
+ return parent_rate / VC5_REF_DIVIDER_REF_DIV(div);
+}
+
+static unsigned long vc5_pfd_set_rate(struct clk *hw, unsigned long rate)
+{
+ struct vc5_driver_data *vc5 =
+ container_of(hw, struct vc5_driver_data, clk_pfd);
+ unsigned long idiv;
+ u8 div;
+ struct clk *clk_parent = clk_get_parent(hw);
+ unsigned long parent_rate = clk_get_rate(clk_parent);
+
+ /* CLKIN within range of PLL input, feed directly to PLL. */
+ if (parent_rate <= 50000000) {
+ vc5_update_bits(vc5->i2c, VC5_VCO_CTRL_AND_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV);
+ vc5_update_bits(vc5->i2c, VC5_REF_DIVIDER, 0xff, 0x00);
+ return 0;
+ }
+
+ idiv = DIV_ROUND_UP(parent_rate, rate);
+
+ /* We have dedicated div-2 predivider. */
+ if (idiv == 2)
+ div = VC5_REF_DIVIDER_SEL_PREDIV2;
+ else
+ div = VC5_REF_DIVIDER_REF_DIV(idiv);
+
+ vc5_update_bits(vc5->i2c, VC5_REF_DIVIDER, 0xff, div);
+ vc5_update_bits(vc5->i2c, VC5_VCO_CTRL_AND_PREDIV,
+ VC5_VCO_CTRL_AND_PREDIV_BYPASS_PREDIV, 0);
+
+ return 0;
+}
+
+static const struct clk_ops vc5_pfd_ops = {
+ .round_rate = vc5_pfd_round_rate,
+ .get_rate = vc5_pfd_recalc_rate,
+ .set_rate = vc5_pfd_set_rate,
+};
+
+/*
+ * VersaClock5 PLL/VCO
+ */
+static unsigned long vc5_pll_recalc_rate(struct clk *hw)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc = hwdata->vc5;
+ struct clk *clk_parent = clk_get_parent(hw);
+ unsigned long parent_rate = clk_get_rate(clk_parent);
+ u32 div_int, div_frc;
+ u8 fb[5];
+
+ dm_i2c_read(vc->i2c, VC5_FEEDBACK_INT_DIV, fb, 5);
+
+ div_int = (fb[0] << 4) | (fb[1] >> 4);
+ div_frc = (fb[2] << 16) | (fb[3] << 8) | fb[4];
+
+ /* The PLL divider has 12 integer bits and 24 fractional bits */
+ return (parent_rate * div_int) + ((parent_rate * div_frc) >> 24);
+}
+
+static unsigned long vc5_pll_round_rate(struct clk *hw, unsigned long rate)
+{
+ struct clk *clk_parent = clk_get_parent(hw);
+ unsigned long parent_rate = clk_get_rate(clk_parent);
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ u32 div_int;
+ u64 div_frc;
+
+ if (rate < VC5_PLL_VCO_MIN)
+ rate = VC5_PLL_VCO_MIN;
+ if (rate > VC5_PLL_VCO_MAX)
+ rate = VC5_PLL_VCO_MAX;
+
+ /* Determine integer part, which is 12 bit wide */
+ div_int = rate / parent_rate;
+ if (div_int > 0xfff)
+ rate = parent_rate * 0xfff;
+
+ /* Determine best fractional part, which is 24 bit wide */
+ div_frc = rate % parent_rate;
+ div_frc *= BIT(24) - 1;
+ do_div(div_frc, parent_rate);
+
+ hwdata->div_int = div_int;
+ hwdata->div_frc = (u32)div_frc;
+
+ return (parent_rate * div_int) + ((parent_rate * div_frc) >> 24);
+}
+
+static unsigned long vc5_pll_set_rate(struct clk *hw, unsigned long rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+ u8 fb[5];
+
+ fb[0] = hwdata->div_int >> 4;
+ fb[1] = hwdata->div_int << 4;
+ fb[2] = hwdata->div_frc >> 16;
+ fb[3] = hwdata->div_frc >> 8;
+ fb[4] = hwdata->div_frc;
+
+ return dm_i2c_write(vc5->i2c, VC5_FEEDBACK_INT_DIV, fb, 5);
+}
+
+static const struct clk_ops vc5_pll_ops = {
+ .round_rate = vc5_pll_round_rate,
+ .get_rate = vc5_pll_recalc_rate,
+ .set_rate = vc5_pll_set_rate,
+};
+
+static unsigned long vc5_fod_recalc_rate(struct clk *hw)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc = hwdata->vc5;
+ struct clk *parent = &vc->clk_pll.hw;
+ unsigned long parent_rate = vc5_pll_recalc_rate(parent);
+
+ /* VCO frequency is divided by two before entering FOD */
+ u32 f_in = parent_rate / 2;
+ u32 div_int, div_frc;
+ u8 od_int[2];
+ u8 od_frc[4];
+
+ dm_i2c_read(vc->i2c, VC5_OUT_DIV_INT(hwdata->num, 0), od_int, 2);
+ dm_i2c_read(vc->i2c, VC5_OUT_DIV_FRAC(hwdata->num, 0), od_frc, 4);
+
+ div_int = (od_int[0] << 4) | (od_int[1] >> 4);
+ div_frc = (od_frc[0] << 22) | (od_frc[1] << 14) |
+ (od_frc[2] << 6) | (od_frc[3] >> 2);
+
+ /* Avoid division by zero if the output is not configured. */
+ if (div_int == 0 && div_frc == 0)
+ return 0;
+
+ /* The PLL divider has 12 integer bits and 30 fractional bits */
+ return div64_u64((u64)f_in << 24ULL, ((u64)div_int << 24ULL) + div_frc);
+}
+
+static unsigned long vc5_fod_round_rate(struct clk *hw, unsigned long rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc = hwdata->vc5;
+ struct clk *parent = &vc->clk_pll.hw;
+ unsigned long parent_rate = vc5_pll_recalc_rate(parent);
+
+ /* VCO frequency is divided by two before entering FOD */
+ u32 f_in = parent_rate / 2;
+ u32 div_int;
+ u64 div_frc;
+
+ /* Determine integer part, which is 12 bit wide */
+ div_int = f_in / rate;
+
+ /*
+ * WARNING: The clock chip does not output signal if the integer part
+ * of the divider is 0xfff and fractional part is non-zero.
+ * Clamp the divider at 0xffe to keep the code simple.
+ */
+ if (div_int > 0xffe) {
+ div_int = 0xffe;
+ rate = f_in / div_int;
+ }
+
+ /* Determine best fractional part, which is 30 bit wide */
+ div_frc = f_in % rate;
+ div_frc <<= 24;
+ do_div(div_frc, rate);
+
+ hwdata->div_int = div_int;
+ hwdata->div_frc = (u32)div_frc;
+
+ return div64_u64((u64)f_in << 24ULL, ((u64)div_int << 24ULL) + div_frc);
+}
+
+static unsigned long vc5_fod_set_rate(struct clk *hw, unsigned long rate)
+{
+ struct vc5_hw_data *hwdata = container_of(hw, struct vc5_hw_data, hw);
+ struct vc5_driver_data *vc5 = hwdata->vc5;
+
+ u8 data[14] = {
+ hwdata->div_frc >> 22, hwdata->div_frc >> 14,
+ hwdata->div_frc >> 6, hwdata->div_frc << 2,
+ 0, 0, 0, 0, 0,
+ 0, 0,
+ hwdata->div_int >> 4, hwdata->div_int << 4,
+ 0
+ };
+
+ dm_i2c_write(vc5->i2c, VC5_OUT_DIV_FRAC(hwdata->num, 0), data, 14);
+
+ /*
+ * Toggle magic bit in undocumented register for unknown reason.
+ * This is what the IDT timing commander tool does and the chip
+ * datasheet somewhat implies this is needed, but the register
+ * and the bit is not documented.
+ */
+ vc5_update_bits(vc5->i2c, VC5_GLOBAL_REGISTER,
+ VC5_GLOBAL_REGISTER_GLOBAL_RESET, 0);
+ vc5_update_bits(vc5->i2c, VC5_GLOBAL_REGISTER,
+ VC5_GLOBAL_REGISTER_GLOBAL_RESET,
+ VC5_GLOBAL_REGISTER_GLOBAL_RESET);
+
+ return 0;
+}
+
+static const struct clk_ops vc5_fod_ops = {
+ .round_rate = vc5_fod_round_rate,
+ .get_rate = vc5_fod_recalc_rate,
+ .set_rate = vc5_fod_set_rate,
+};
+
+static int vc5_clk_out_prepare(struct clk *hw)
+{
+ struct udevice *dev;
+ struct vc5_driver_data *vc5;
+ struct vc5_out_data *hwdata;
+
+ const u8 mask = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT |
+ VC5_OUT_DIV_CONTROL_EN_FOD;
+ unsigned int src;
+ int ret;
+
+ uclass_get_device_by_name(UCLASS_CLK, clk_hw_get_name(hw), &dev);
+ vc5 = dev_get_priv(dev);
+ hwdata = &vc5->clk_out[hw->id];
+
+ /*
+ * If the input mux is disabled, enable it first and
+ * select source from matching FOD.
+ */
+
+ dm_i2c_read(vc5->i2c, VC5_OUT_DIV_CONTROL(hwdata->num), (uchar *)&src, 1);
+
+ if ((src & mask) == 0) {
+ src = VC5_OUT_DIV_CONTROL_RESET | VC5_OUT_DIV_CONTROL_EN_FOD;
+ ret = vc5_update_bits(vc5->i2c,
+ VC5_OUT_DIV_CONTROL(hwdata->num),
+ mask | VC5_OUT_DIV_CONTROL_RESET, src);
+ if (ret)
+ return ret;
+ }
+
+ /* Enable the clock buffer */
+ vc5_update_bits(vc5->i2c, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF,
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF);
+ if (hwdata->clk_output_cfg0_mask) {
+ vc5_update_bits(vc5->i2c, VC5_CLK_OUTPUT_CFG(hwdata->num, 0),
+ hwdata->clk_output_cfg0_mask,
+ hwdata->clk_output_cfg0);
+ }
+
+ return 0;
+}
+
+static int vc5_clk_out_unprepare(struct clk *hw)
+{
+ struct udevice *dev;
+ struct vc5_driver_data *vc5;
+ struct vc5_out_data *hwdata;
+ int ret;
+
+ uclass_get_device_by_name(UCLASS_CLK, clk_hw_get_name(hw), &dev);
+ vc5 = dev_get_priv(dev);
+ hwdata = &vc5->clk_out[hw->id];
+
+ /* Disable the clock buffer */
+ ret = vc5_update_bits(vc5->i2c, VC5_CLK_OUTPUT_CFG(hwdata->num, 1),
+ VC5_CLK_OUTPUT_CFG1_EN_CLKBUF, 0);
+
+ return ret;
+}
+
+static int vc5_clk_out_set_parent(struct vc5_driver_data *vc, u8 num, u8 index)
+{
+ const u8 mask = VC5_OUT_DIV_CONTROL_RESET |
+ VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT |
+ VC5_OUT_DIV_CONTROL_EN_FOD;
+ const u8 extclk = VC5_OUT_DIV_CONTROL_SELB_NORM |
+ VC5_OUT_DIV_CONTROL_SEL_EXT;
+ u8 src = VC5_OUT_DIV_CONTROL_RESET;
+
+ if (index == 0)
+ src |= VC5_OUT_DIV_CONTROL_EN_FOD;
+ else
+ src |= extclk;
+
+ return vc5_update_bits(vc->i2c, VC5_OUT_DIV_CONTROL(num), mask, src);
+}
+
+/*
+ * The device references to the Versaclock point to the head, so xlate needs to
+ * redirect it to clk_out[idx]
+ */
+static int vc5_clk_out_xlate(struct clk *hw, struct ofnode_phandle_args *args)
+{
+ unsigned int idx = args->args[0];
+
+ if (args->args_count != 1) {
+ debug("Invaild args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ hw->id = idx;
+
+ return 0;
+}
+
+static unsigned long vc5_clk_out_set_rate(struct clk *hw, unsigned long rate)
+{
+ struct udevice *dev;
+ struct vc5_driver_data *vc;
+ struct clk *parent;
+
+ uclass_get_device_by_name(UCLASS_CLK, clk_hw_get_name(hw), &dev);
+ vc = dev_get_priv(dev);
+ parent = clk_get_parent(&vc->clk_out[hw->id].hw);
+
+ /* setting the output rate really means setting the parent FOD rate */
+ return clk_set_rate(parent, clk_round_rate(parent, rate));
+}
+
+static unsigned long vc5_clk_out_get_rate(struct clk *hw)
+{
+ return clk_get_parent_rate(hw);
+}
+
+static const struct clk_ops vc5_clk_out_ops = {
+ .enable = vc5_clk_out_prepare,
+ .disable = vc5_clk_out_unprepare,
+ .set_rate = vc5_clk_out_set_rate,
+ .get_rate = vc5_clk_out_get_rate,
+};
+
+static const struct clk_ops vc5_clk_out_sel_ops = {
+ .enable = vc5_clk_out_prepare,
+ .disable = vc5_clk_out_unprepare,
+ .get_rate = vc5_clk_out_get_rate,
+};
+
+static const struct clk_ops vc5_clk_ops = {
+ .enable = vc5_clk_out_prepare,
+ .disable = vc5_clk_out_unprepare,
+ .of_xlate = vc5_clk_out_xlate,
+ .set_rate = vc5_clk_out_set_rate,
+ .get_rate = vc5_clk_out_get_rate,
+};
+
+static int vc5_map_index_to_output(const enum vc5_model model,
+ const unsigned int n)
+{
+ switch (model) {
+ case IDT_VC5_5P49V5933:
+ return (n == 0) ? 0 : 3;
+ case IDT_VC5_5P49V5923:
+ case IDT_VC5_5P49V5925:
+ case IDT_VC5_5P49V5935:
+ case IDT_VC6_5P49V6901:
+ case IDT_VC6_5P49V6965:
+ default:
+ return n;
+ }
+}
+
+static int vc5_update_mode(ofnode np_output,
+ struct vc5_out_data *clk_out)
+{
+ u32 value;
+
+ if (!ofnode_read_u32(np_output, "idt,mode", &value)) {
+ clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_CFG_MASK;
+ switch (value) {
+ case VC5_CLK_OUTPUT_CFG0_CFG_LVPECL:
+ case VC5_CLK_OUTPUT_CFG0_CFG_CMOS:
+ case VC5_CLK_OUTPUT_CFG0_CFG_HCSL33:
+ case VC5_CLK_OUTPUT_CFG0_CFG_LVDS:
+ case VC5_CLK_OUTPUT_CFG0_CFG_CMOS2:
+ case VC5_CLK_OUTPUT_CFG0_CFG_CMOSD:
+ case VC5_CLK_OUTPUT_CFG0_CFG_HCSL25:
+ clk_out->clk_output_cfg0 |=
+ value << VC5_CLK_OUTPUT_CFG0_CFG_SHIFT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int vc5_update_power(ofnode np_output, struct vc5_out_data *clk_out)
+{
+ u32 value;
+
+ if (!ofnode_read_u32(np_output, "idt,voltage-microvolt", &value)) {
+ clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_PWR_MASK;
+ switch (value) {
+ case 1800000:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_18;
+ break;
+ case 2500000:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_25;
+ break;
+ case 3300000:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_PWR_33;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int vc5_map_cap_value(u32 femtofarads)
+{
+ int mapped_value;
+
+ /*
+ * The datasheet explicitly states 9000 - 25000 with 0.5pF
+ * steps, but the Programmer's guide shows the steps are 0.430pF.
+ * After getting feedback from Renesas, the .5pF steps were the
+ * goal, but 430nF was the actual values.
+ * Because of this, the actual range goes to 22760 instead of 25000
+ */
+ if (femtofarads < 9000 || femtofarads > 22760)
+ return -EINVAL;
+
+ /*
+ * The Programmer's guide shows XTAL[5:0] but in reality,
+ * XTAL[0] and XTAL[1] are both LSB which makes the math
+ * strange. With clarfication from Renesas, setting the
+ * values should be simpler by ignoring XTAL[0]
+ */
+ mapped_value = DIV_ROUND_CLOSEST(femtofarads - 9000, 430);
+
+ /*
+ * Since the calculation ignores XTAL[0], there is one
+ * special case where mapped_value = 32. In reality, this means
+ * the real mapped value should be 111111b. In other cases,
+ * the mapped_value needs to be shifted 1 to the left.
+ */
+ if (mapped_value > 31)
+ mapped_value = 0x3f;
+ else
+ mapped_value <<= 1;
+
+ return mapped_value;
+}
+
+static int vc5_update_cap_load(ofnode node, struct vc5_driver_data *vc5)
+{
+ u32 value;
+ int mapped_value;
+
+ if (!ofnode_read_u32(node, "idt,xtal-load-femtofarads", &value)) {
+ mapped_value = vc5_map_cap_value(value);
+
+ if (mapped_value < 0)
+ return mapped_value;
+
+ /*
+ * The mapped_value is really the high 6 bits of
+ * VC5_XTAL_X1_LOAD_CAP and VC5_XTAL_X2_LOAD_CAP, so
+ * shift the value 2 places.
+ */
+ vc5_update_bits(vc5->i2c, VC5_XTAL_X1_LOAD_CAP, ~0x03, mapped_value << 2);
+ vc5_update_bits(vc5->i2c, VC5_XTAL_X2_LOAD_CAP, ~0x03, mapped_value << 2);
+ }
+
+ return 0;
+}
+
+static int vc5_update_slew(ofnode np_output, struct vc5_out_data *clk_out)
+{
+ u32 value;
+
+ if (!ofnode_read_u32(np_output, "idt,slew-percent", &value)) {
+ clk_out->clk_output_cfg0_mask |= VC5_CLK_OUTPUT_CFG0_SLEW_MASK;
+
+ switch (value) {
+ case 80:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_80;
+ break;
+ case 85:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_85;
+ break;
+ case 90:
+ clk_out->clk_output_cfg0 |= VC5_CLK_OUTPUT_CFG0_SLEW_90;
+ break;
+ case 100:
+ clk_out->clk_output_cfg0 |=
+ VC5_CLK_OUTPUT_CFG0_SLEW_100;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static const struct udevice_id versaclock_ids[] = {
+ { .compatible = "idt,5p49v5923", .data = (ulong)&idt_5p49v5923_info },
+ { .compatible = "idt,5p49v5925", .data = (ulong)&idt_5p49v5925_info },
+ { .compatible = "idt,5p49v5933", .data = (ulong)&idt_5p49v5933_info },
+ { .compatible = "idt,5p49v5935", .data = (ulong)&idt_5p49v5935_info },
+ { .compatible = "idt,5p49v6901", .data = (ulong)&idt_5p49v6901_info },
+ { .compatible = "idt,5p49v6965", .data = (ulong)&idt_5p49v6965_info },
+ {},
+};
+
+static int vc5_get_output_config(struct udevice *dev,
+ struct vc5_out_data *clk_out)
+{
+ ofnode np_output;
+ char child_name[5];
+ int ret = 0;
+
+ sprintf(child_name, "OUT%d", clk_out->num + 1);
+
+ np_output = ofnode_find_subnode(dev_ofnode(dev), child_name);
+
+ if (!ofnode_valid(np_output)) {
+ printf("!ofnode_valid(np_output)\n");
+ return 0;
+ }
+
+ ret = vc5_update_mode(np_output, clk_out);
+ if (ret)
+ goto output_error;
+
+ ret = vc5_update_power(np_output, clk_out);
+ if (ret)
+ goto output_error;
+
+ ret = vc5_update_slew(np_output, clk_out);
+
+output_error:
+ if (ret)
+ pr_err("Invalid clock output configuration OUT%d\n", clk_out->num + 1);
+
+ return ret;
+}
+
+int versaclock_probe(struct udevice *dev)
+{
+ struct vc5_driver_data *vc5 = dev_get_priv(dev);
+ struct vc5_chip_info *chip = (void *)dev_get_driver_data(dev);
+ unsigned int n, idx = 0;
+ char *mux_name, *pfd_name, *pll_name, *outsel_name;
+ char *out_name[VC5_MAX_CLK_OUT_NUM];
+ char *fod_name[VC5_MAX_FOD_NUM];
+ int ret;
+ u64 val;
+
+ val = (u64)dev_read_addr_ptr(dev);
+ ret = i2c_get_chip(dev->parent, val, 1, &vc5->i2c);
+
+ if (ret) {
+ dev_err(dev, "I2C probe failed.\n");
+ return ret;
+ }
+
+ vc5->chip_info = chip;
+ vc5->pin_xin = devm_clk_get(dev, "xin");
+
+ if (IS_ERR(vc5->pin_xin))
+ dev_err(dev, "failed to get xin clock\n");
+
+ ret = clk_enable(vc5->pin_xin);
+ if (ret)
+ dev_err(dev, "failed to enable XIN clock\n");
+
+ vc5->pin_clkin = devm_clk_get(dev, "clkin");
+
+ /* Register clock input mux */
+ if (!IS_ERR(vc5->pin_xin)) {
+ vc5->clk_mux_ins |= VC5_MUX_IN_XIN;
+ } else if (vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL) {
+ if (IS_ERR(vc5->pin_xin))
+ return PTR_ERR(vc5->pin_xin);
+ vc5->clk_mux_ins |= VC5_MUX_IN_XIN;
+ }
+
+ mux_name = malloc(strlen(dev->name) + 4);
+ sprintf(mux_name, "%s.mux", dev->name);
+ clk_register(&vc5->clk_mux, "versaclock-mux", mux_name, vc5->pin_xin->dev->name);
+
+ if (!IS_ERR(vc5->pin_xin))
+ vc5_mux_set_parent(&vc5->clk_mux, 1);
+ else
+ vc5_mux_set_parent(&vc5->clk_mux, 0);
+
+ /* Configure Optional Loading Capacitance for external XTAL */
+ if (!(vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL)) {
+ ret = vc5_update_cap_load(dev_ofnode(dev), vc5);
+ if (ret)
+ dev_err(dev, "failed to vc5_update_cap_load\n");
+ }
+
+ /* Register PFD */
+ pfd_name = malloc(strlen(dev->name) + 5);
+ sprintf(pfd_name, "%s.pfd", dev->name);
+ clk_register(&vc5->clk_pfd, "versaclock-pfd", pfd_name, vc5->clk_mux.dev->name);
+
+ /* Register PLL */
+ vc5->clk_pll.num = 0;
+ vc5->clk_pll.vc5 = vc5;
+ pll_name = malloc(strlen(dev->name) + 4);
+ sprintf(pll_name, "%s.pll", dev->name);
+ clk_register(&vc5->clk_pll.hw, "versaclock-pll", pll_name, vc5->clk_pfd.dev->name);
+
+ /* Register FODs */
+ for (n = 0; n < vc5->chip_info->clk_fod_cnt; n++) {
+ fod_name[n] = malloc(strlen(dev->name) + 5);
+ sprintf(fod_name[n], "%s.fod%d", dev->name, n);
+ idx = vc5_map_index_to_output(vc5->chip_info->model, n);
+ vc5->clk_fod[n].num = idx;
+ vc5->clk_fod[n].vc5 = vc5;
+ ret = clk_register(&vc5->clk_fod[n].hw, "versaclock-fod", fod_name[n],
+ vc5->clk_pll.hw.dev->name);
+ }
+
+ /* Register MUX-connected OUT0_I2C_SELB output */
+ vc5->clk_out[0].num = idx;
+ vc5->clk_out[0].vc5 = vc5;
+ outsel_name = malloc(strlen(dev->name) + 14); /* .out0_sel_i2cb */
+ sprintf(outsel_name, "%s.out0_sel_i2cb", dev->name);
+ ret = clk_register(&vc5->clk_out[0].hw, "versaclock-outsel", outsel_name,
+ vc5->clk_mux.dev->name);
+
+ /* Register FOD-connected OUTx outputs */
+ for (n = 1; n < vc5->chip_info->clk_out_cnt; n++) {
+ idx = vc5_map_index_to_output(vc5->chip_info->model, n - 1);
+ out_name[n] = malloc(strlen(dev->name) + 5);
+ sprintf(out_name[n], "%s.out%d", dev->name, n);
+ vc5->clk_out[n].num = idx;
+ vc5->clk_out[n].vc5 = vc5;
+ ret = clk_register(&vc5->clk_out[n].hw, "versaclock-out", out_name[n],
+ vc5->clk_fod[idx].hw.dev->name);
+
+ vc5_clk_out_set_parent(vc5, idx, 0);
+
+ /* Fetch Clock Output configuration from DT (if specified) */
+ ret = vc5_get_output_config(dev, &vc5->clk_out[n]);
+ if (ret)
+ dev_err(dev, "failed to vc5_get_output_config()\n");
+ }
+
+ return 0;
+}
+
+U_BOOT_DRIVER(versaclock_mux) = {
+ .name = "versaclock-mux",
+ .id = UCLASS_CLK,
+ .ops = &vc5_mux_ops,
+};
+
+U_BOOT_DRIVER(versaclock_pfd) = {
+ .name = "versaclock-pfd",
+ .id = UCLASS_CLK,
+ .ops = &vc5_pfd_ops,
+};
+
+U_BOOT_DRIVER(versaclock_pll) = {
+ .name = "versaclock-pll",
+ .id = UCLASS_CLK,
+ .ops = &vc5_pll_ops,
+};
+
+U_BOOT_DRIVER(versaclock_fod) = {
+ .name = "versaclock-fod",
+ .id = UCLASS_CLK,
+ .ops = &vc5_fod_ops,
+};
+
+U_BOOT_DRIVER(versaclock_out) = {
+ .name = "versaclock-out",
+ .id = UCLASS_CLK,
+ .ops = &vc5_clk_out_ops,
+};
+
+U_BOOT_DRIVER(versaclock_outsel) = {
+ .name = "versaclock-outsel",
+ .id = UCLASS_CLK,
+ .ops = &vc5_clk_out_sel_ops,
+};
+
+U_BOOT_DRIVER(versaclock) = {
+ .name = "versaclock",
+ .id = UCLASS_CLK,
+ .ops = &vc5_clk_ops,
+ .of_match = versaclock_ids,
+ .probe = versaclock_probe,
+ .priv_auto = sizeof(struct vc5_driver_data),
+};
--
2.25.1
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