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@@ -0,0 +1,241 @@
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+/*
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+ * ZynqMP clock driver
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+ *
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+ * Copyright (C) 2016 Xilinx, Inc.
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+ *
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+ * SPDX-License-Identifier: GPL-2.0+
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+ */
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+
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+#include <common.h>
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+#include <linux/bitops.h>
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+#include <clk-uclass.h>
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+#include <dm/device.h>
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+#include <clk.h>
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+
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+#define ZYNQMP_GEM0_REF_CTRL 0xFF5E0050
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+#define ZYNQMP_IOPLL_CTRL 0xFF5E0020
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+#define ZYNQMP_RPLL_CTRL 0xFF5E0030
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+#define ZYNQMP_DPLL_CTRL 0xFD1A002C
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+#define ZYNQMP_SIP_SVC_MMIO_WRITE 0xC2000013
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+#define ZYNQMP_SIP_SVC_MMIO_WRITE 0xC2000013
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+#define ZYNQMP_SIP_SVC_MMIO_WRITE 0xC2000013
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+#define ZYNQMP_SIP_SVC_MMIO_READ 0xC2000014
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+#define ZYNQMP_DIV_MAX_VAL 0x3F
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+#define ZYNQMP_DIV1_SHFT 8
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+#define ZYNQMP_DIV1_SHFT 8
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+#define ZYNQMP_DIV2_SHFT 16
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+#define ZYNQMP_DIV_MASK 0x3F
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+#define ZYNQMP_PLL_CTRL_FBDIV_MASK 0x7F
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+#define ZYNQMP_PLL_CTRL_FBDIV_SHFT 8
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+#define ZYNQMP_GEM_REF_CTRL_SRC_MASK 0x7
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+#define ZYNQMP_GEM0_CLK_ID 45
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+#define ZYNQMP_GEM1_CLK_ID 46
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+#define ZYNQMP_GEM2_CLK_ID 47
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+#define ZYNQMP_GEM3_CLK_ID 48
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+
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+static unsigned long pss_ref_clk;
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+
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+static int zynqmp_calculate_divisors(unsigned long req_rate,
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+ unsigned long parent_rate,
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+ u32 *div1, u32 *div2)
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+{
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+ u32 req_div = 1;
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+ u32 i;
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+
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+ /*
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+ * calculate two divisors to get
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+ * required rate and each divisor
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+ * should be less than 63
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+ */
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+ req_div = DIV_ROUND_UP(parent_rate, req_rate);
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+
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+ for (i = 1; i <= req_div; i++) {
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+ if ((req_div % i) == 0) {
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+ *div1 = req_div / i;
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+ *div2 = i;
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+ if ((*div1 < ZYNQMP_DIV_MAX_VAL) &&
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+ (*div2 < ZYNQMP_DIV_MAX_VAL))
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+ return 0;
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+ }
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+ }
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+
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+ return -1;
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+}
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+
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+static int zynqmp_get_periph_id(unsigned long id)
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+{
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+ int periph_id;
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+
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+ switch (id) {
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+ case ZYNQMP_GEM0_CLK_ID:
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+ periph_id = 0;
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+ break;
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+ case ZYNQMP_GEM1_CLK_ID:
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+ periph_id = 1;
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+ break;
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+ case ZYNQMP_GEM2_CLK_ID:
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+ periph_id = 2;
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+ break;
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+ case ZYNQMP_GEM3_CLK_ID:
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+ periph_id = 3;
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+ break;
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+ default:
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+ printf("%s, Invalid clock id:%ld\n", __func__, id);
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+ return -EINVAL;
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+ }
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+
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+ return periph_id;
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+}
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+
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+static int zynqmp_set_clk(unsigned long id, u32 div1, u32 div2)
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+{
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+ struct pt_regs regs;
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+ ulong reg;
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+ u32 mask, value;
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+
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+ id = zynqmp_get_periph_id(id);
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+ if (id < 0)
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+ return -EINVAL;
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+
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+ reg = (ulong)((u32 *)ZYNQMP_GEM0_REF_CTRL + id);
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+ mask = (ZYNQMP_DIV_MASK << ZYNQMP_DIV1_SHFT) |
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+ (ZYNQMP_DIV_MASK << ZYNQMP_DIV2_SHFT);
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+ value = (div1 << ZYNQMP_DIV1_SHFT) | (div2 << ZYNQMP_DIV2_SHFT);
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+
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+ debug("%s: reg:0x%lx, mask:0x%x, value:0x%x\n", __func__, reg, mask,
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+ value);
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+
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+ regs.regs[0] = ZYNQMP_SIP_SVC_MMIO_WRITE;
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+ regs.regs[1] = ((u64)mask << 32) | reg;
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+ regs.regs[2] = value;
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+ regs.regs[3] = 0;
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+
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+ smc_call(®s);
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+
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+ return regs.regs[0];
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+}
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+
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+static unsigned long zynqmp_clk_get_rate(struct clk *clk)
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+{
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+ struct pt_regs regs;
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+ ulong reg;
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+ unsigned long value;
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+ int id;
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+
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+ id = zynqmp_get_periph_id(clk->id);
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+ if (id < 0)
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+ return -EINVAL;
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+
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+ reg = (ulong)((u32 *)ZYNQMP_GEM0_REF_CTRL + id);
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+
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+ regs.regs[0] = ZYNQMP_SIP_SVC_MMIO_READ;
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+ regs.regs[1] = reg;
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+ regs.regs[2] = 0;
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+ regs.regs[3] = 0;
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+
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+ smc_call(®s);
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+
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+ value = upper_32_bits(regs.regs[0]);
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+
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+ value &= ZYNQMP_GEM_REF_CTRL_SRC_MASK;
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+
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+ switch (value) {
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+ case 0:
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+ regs.regs[1] = ZYNQMP_IOPLL_CTRL;
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+ break;
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+ case 2:
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+ regs.regs[1] = ZYNQMP_RPLL_CTRL;
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+ break;
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+ case 3:
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+ regs.regs[1] = ZYNQMP_DPLL_CTRL;
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+ break;
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+ default:
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+ return -EINVAL;
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+ }
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+
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+ regs.regs[0] = ZYNQMP_SIP_SVC_MMIO_READ;
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+ regs.regs[2] = 0;
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+ regs.regs[3] = 0;
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+
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+ smc_call(®s);
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+
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+ value = upper_32_bits(regs.regs[0]) &
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+ (ZYNQMP_PLL_CTRL_FBDIV_MASK <<
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+ ZYNQMP_PLL_CTRL_FBDIV_SHFT);
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+ value >>= ZYNQMP_PLL_CTRL_FBDIV_SHFT;
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+ value *= pss_ref_clk;
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+
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+ return value;
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+}
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+
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+static ulong zynqmp_clk_set_rate(struct clk *clk, unsigned long clk_rate)
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+{
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+ int ret;
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+ u32 div1 = 0;
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+ u32 div2 = 0;
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+ unsigned long input_clk;
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+
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+ input_clk = zynqmp_clk_get_rate(clk);
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+ if (IS_ERR_VALUE(input_clk)) {
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+ dev_err(dev, "failed to get input_clk\n");
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+ return -EINVAL;
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+ }
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+
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+ debug("%s: i/p CLK %ld, clk_rate:0x%ld\n", __func__, input_clk,
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+ clk_rate);
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+
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+ ret = zynqmp_calculate_divisors(clk_rate, input_clk, &div1, &div2);
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+ if (ret) {
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+ dev_err(dev, "failed to proper divisors\n");
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+ return -EINVAL;
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+ }
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+
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+ debug("%s: Div1:%d, Div2:%d\n", __func__, div1, div2);
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+
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+ ret = zynqmp_set_clk(clk->id, div1, div2);
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+ if (ret) {
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+ dev_err(dev, "failed to set gem clk\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int zynqmp_clk_probe(struct udevice *dev)
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+{
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+ struct clk clk;
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+ int ret;
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+
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+ debug("%s\n", __func__);
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+ ret = clk_get_by_name(dev, "pss_ref_clk", &clk);
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+ if (ret < 0) {
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+ dev_err(dev, "failed to get pss_ref_clk\n");
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+ return ret;
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+ }
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+
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+ pss_ref_clk = clk_get_rate(&clk);
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+ if (IS_ERR_VALUE(pss_ref_clk)) {
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+ dev_err(dev, "failed to get rate pss_ref_clk\n");
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static struct clk_ops zynqmp_clk_ops = {
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+ .set_rate = zynqmp_clk_set_rate,
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+ .get_rate = zynqmp_clk_get_rate,
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+};
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+
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+static const struct udevice_id zynqmp_clk_ids[] = {
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+ { .compatible = "xlnx,zynqmp-clkc" },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(zynqmp_clk) = {
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+ .name = "zynqmp-clk",
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+ .id = UCLASS_CLK,
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+ .of_match = zynqmp_clk_ids,
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+ .probe = zynqmp_clk_probe,
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+ .ops = &zynqmp_clk_ops,
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+};
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