summaryrefslogtreecommitdiffstats
path: root/drivers/clk/socfpga/clk-pll-a10.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/socfpga/clk-pll-a10.c')
-rw-r--r--drivers/clk/socfpga/clk-pll-a10.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/clk/socfpga/clk-pll-a10.c b/drivers/clk/socfpga/clk-pll-a10.c
new file mode 100644
index 000000000..bee0f7da5
--- /dev/null
+++ b/drivers/clk/socfpga/clk-pll-a10.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015 Altera Corporation. All rights reserved
+ */
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include "clk.h"
+
+/* Clock Manager offsets */
+#define CLK_MGR_PLL_CLK_SRC_SHIFT 8
+#define CLK_MGR_PLL_CLK_SRC_MASK 0x3
+
+/* Clock bypass bits */
+#define SOCFPGA_PLL_BG_PWRDWN 0
+#define SOCFPGA_PLL_PWR_DOWN 1
+#define SOCFPGA_PLL_EXT_ENA 2
+#define SOCFPGA_PLL_DIVF_MASK 0x00001FFF
+#define SOCFPGA_PLL_DIVF_SHIFT 0
+#define SOCFPGA_PLL_DIVQ_MASK 0x003F0000
+#define SOCFPGA_PLL_DIVQ_SHIFT 16
+#define SOCFGPA_MAX_PARENTS 5
+
+#define SOCFPGA_MAIN_PLL_CLK "main_pll"
+#define SOCFPGA_PERIP_PLL_CLK "periph_pll"
+
+#define to_socfpga_clk(p) container_of(p, struct socfpga_pll, hw.hw)
+
+void __iomem *clk_mgr_a10_base_addr;
+
+static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk,
+ unsigned long parent_rate)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+ unsigned long divf, divq, reg;
+ unsigned long long vco_freq;
+
+ /* read VCO1 reg for numerator and denominator */
+ reg = readl(socfpgaclk->hw.reg + 0x4);
+ divf = (reg & SOCFPGA_PLL_DIVF_MASK) >> SOCFPGA_PLL_DIVF_SHIFT;
+ divq = (reg & SOCFPGA_PLL_DIVQ_MASK) >> SOCFPGA_PLL_DIVQ_SHIFT;
+ vco_freq = (unsigned long long)parent_rate * (divf + 1);
+ do_div(vco_freq, (1 + divq));
+ return (unsigned long)vco_freq;
+}
+
+static u8 clk_pll_get_parent(struct clk_hw *hwclk)
+{
+ struct socfpga_pll *socfpgaclk = to_socfpga_clk(hwclk);
+ u32 pll_src;
+
+ pll_src = readl(socfpgaclk->hw.reg);
+
+ return (pll_src >> CLK_MGR_PLL_CLK_SRC_SHIFT) &
+ CLK_MGR_PLL_CLK_SRC_MASK;
+}
+
+static const struct clk_ops clk_pll_ops = {
+ .recalc_rate = clk_pll_recalc_rate,
+ .get_parent = clk_pll_get_parent,
+};
+
+static struct clk_hw * __init __socfpga_pll_init(struct device_node *node,
+ const struct clk_ops *ops)
+{
+ u32 reg;
+ struct clk_hw *hw_clk;
+ struct socfpga_pll *pll_clk;
+ const char *clk_name = node->name;
+ const char *parent_name[SOCFGPA_MAX_PARENTS];
+ struct clk_init_data init;
+ struct device_node *clkmgr_np;
+ int i = 0;
+
+ of_property_read_u32(node, "reg", &reg);
+
+ pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL);
+ if (WARN_ON(!pll_clk))
+ return NULL;
+
+ clkmgr_np = of_find_compatible_node(NULL, NULL, "altr,clk-mgr");
+ clk_mgr_a10_base_addr = of_iomap(clkmgr_np, 0);
+ of_node_put(clkmgr_np);
+ BUG_ON(!clk_mgr_a10_base_addr);
+ pll_clk->hw.reg = clk_mgr_a10_base_addr + reg;
+
+ of_property_read_string(node, "clock-output-names", &clk_name);
+
+ init.name = clk_name;
+ init.ops = ops;
+ init.flags = 0;
+
+ while (i < SOCFGPA_MAX_PARENTS && (parent_name[i] =
+ of_clk_get_parent_name(node, i)) != NULL)
+ i++;
+ init.num_parents = i;
+ init.parent_names = parent_name;
+ pll_clk->hw.hw.init = &init;
+
+ pll_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;
+ hw_clk = &pll_clk->hw.hw;
+
+ if (clk_hw_register(NULL, hw_clk)) {
+ kfree(pll_clk);
+ return NULL;
+ }
+ of_clk_add_provider(node, of_clk_src_simple_get, hw_clk);
+ return hw_clk;
+}
+
+void __init socfpga_a10_pll_init(struct device_node *node)
+{
+ __socfpga_pll_init(node, &clk_pll_ops);
+}