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path: root/drivers/clk/axis/clk-artpec6.c
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Diffstat (limited to 'drivers/clk/axis/clk-artpec6.c')
-rw-r--r--drivers/clk/axis/clk-artpec6.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/clk/axis/clk-artpec6.c b/drivers/clk/axis/clk-artpec6.c
new file mode 100644
index 000000000..f95959ff8
--- /dev/null
+++ b/drivers/clk/axis/clk-artpec6.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ARTPEC-6 clock initialization
+ *
+ * Copyright 2015-2016 Axis Comunications AB.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <dt-bindings/clock/axis,artpec6-clkctrl.h>
+
+#define NUM_I2S_CLOCKS 2
+
+struct artpec6_clkctrl_drvdata {
+ struct clk *clk_table[ARTPEC6_CLK_NUMCLOCKS];
+ void __iomem *syscon_base;
+ struct clk_onecell_data clk_data;
+ spinlock_t i2scfg_lock;
+};
+
+static struct artpec6_clkctrl_drvdata *clkdata;
+
+static const char *const i2s_clk_names[NUM_I2S_CLOCKS] = {
+ "i2s0",
+ "i2s1",
+};
+
+static const int i2s_clk_indexes[NUM_I2S_CLOCKS] = {
+ ARTPEC6_CLK_I2S0_CLK,
+ ARTPEC6_CLK_I2S1_CLK,
+};
+
+static void of_artpec6_clkctrl_setup(struct device_node *np)
+{
+ int i;
+ const char *sys_refclk_name;
+ u32 pll_mode, pll_m, pll_n;
+ struct clk **clks;
+
+ /* Mandatory parent clock. */
+ i = of_property_match_string(np, "clock-names", "sys_refclk");
+ if (i < 0)
+ return;
+
+ sys_refclk_name = of_clk_get_parent_name(np, i);
+
+ clkdata = kzalloc(sizeof(*clkdata), GFP_KERNEL);
+ if (!clkdata)
+ return;
+
+ clks = clkdata->clk_table;
+
+ for (i = 0; i < ARTPEC6_CLK_NUMCLOCKS; ++i)
+ clks[i] = ERR_PTR(-EPROBE_DEFER);
+
+ clkdata->syscon_base = of_iomap(np, 0);
+ BUG_ON(clkdata->syscon_base == NULL);
+
+ /* Read PLL1 factors configured by boot strap pins. */
+ pll_mode = (readl(clkdata->syscon_base) >> 6) & 3;
+ switch (pll_mode) {
+ case 0: /* DDR3-2133 mode */
+ pll_m = 4;
+ pll_n = 85;
+ break;
+ case 1: /* DDR3-1866 mode */
+ pll_m = 6;
+ pll_n = 112;
+ break;
+ case 2: /* DDR3-1600 mode */
+ pll_m = 4;
+ pll_n = 64;
+ break;
+ case 3: /* DDR3-1333 mode */
+ pll_m = 8;
+ pll_n = 106;
+ break;
+ }
+
+ clks[ARTPEC6_CLK_CPU] =
+ clk_register_fixed_factor(NULL, "cpu", sys_refclk_name, 0, pll_n,
+ pll_m);
+ clks[ARTPEC6_CLK_CPU_PERIPH] =
+ clk_register_fixed_factor(NULL, "cpu_periph", "cpu", 0, 1, 2);
+
+ /* EPROBE_DEFER on the apb_clock is not handled in amba devices. */
+ clks[ARTPEC6_CLK_UART_PCLK] =
+ clk_register_fixed_factor(NULL, "uart_pclk", "cpu", 0, 1, 8);
+ clks[ARTPEC6_CLK_UART_REFCLK] =
+ clk_register_fixed_rate(NULL, "uart_ref", sys_refclk_name, 0,
+ 50000000);
+
+ clks[ARTPEC6_CLK_SPI_PCLK] =
+ clk_register_fixed_factor(NULL, "spi_pclk", "cpu", 0, 1, 8);
+ clks[ARTPEC6_CLK_SPI_SSPCLK] =
+ clk_register_fixed_rate(NULL, "spi_sspclk", sys_refclk_name, 0,
+ 50000000);
+
+ clks[ARTPEC6_CLK_DBG_PCLK] =
+ clk_register_fixed_factor(NULL, "dbg_pclk", "cpu", 0, 1, 8);
+
+ clkdata->clk_data.clks = clkdata->clk_table;
+ clkdata->clk_data.clk_num = ARTPEC6_CLK_NUMCLOCKS;
+
+ of_clk_add_provider(np, of_clk_src_onecell_get, &clkdata->clk_data);
+}
+
+CLK_OF_DECLARE_DRIVER(artpec6_clkctrl, "axis,artpec6-clkctrl",
+ of_artpec6_clkctrl_setup);
+
+static int artpec6_clkctrl_probe(struct platform_device *pdev)
+{
+ int propidx;
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct clk **clks = clkdata->clk_table;
+ const char *sys_refclk_name;
+ const char *i2s_refclk_name = NULL;
+ const char *frac_clk_name[2] = { NULL, NULL };
+ const char *i2s_mux_parents[2];
+ u32 muxreg;
+ int i;
+ int err = 0;
+
+ /* Mandatory parent clock. */
+ propidx = of_property_match_string(np, "clock-names", "sys_refclk");
+ if (propidx < 0)
+ return -EINVAL;
+
+ sys_refclk_name = of_clk_get_parent_name(np, propidx);
+
+ /* Find clock names of optional parent clocks. */
+ propidx = of_property_match_string(np, "clock-names", "i2s_refclk");
+ if (propidx >= 0)
+ i2s_refclk_name = of_clk_get_parent_name(np, propidx);
+
+ propidx = of_property_match_string(np, "clock-names", "frac_clk0");
+ if (propidx >= 0)
+ frac_clk_name[0] = of_clk_get_parent_name(np, propidx);
+ propidx = of_property_match_string(np, "clock-names", "frac_clk1");
+ if (propidx >= 0)
+ frac_clk_name[1] = of_clk_get_parent_name(np, propidx);
+
+ spin_lock_init(&clkdata->i2scfg_lock);
+
+ clks[ARTPEC6_CLK_NAND_CLKA] =
+ clk_register_fixed_factor(dev, "nand_clka", "cpu", 0, 1, 8);
+ clks[ARTPEC6_CLK_NAND_CLKB] =
+ clk_register_fixed_rate(dev, "nand_clkb", sys_refclk_name, 0,
+ 100000000);
+ clks[ARTPEC6_CLK_ETH_ACLK] =
+ clk_register_fixed_factor(dev, "eth_aclk", "cpu", 0, 1, 4);
+ clks[ARTPEC6_CLK_DMA_ACLK] =
+ clk_register_fixed_factor(dev, "dma_aclk", "cpu", 0, 1, 4);
+ clks[ARTPEC6_CLK_PTP_REF] =
+ clk_register_fixed_rate(dev, "ptp_ref", sys_refclk_name, 0,
+ 100000000);
+ clks[ARTPEC6_CLK_SD_PCLK] =
+ clk_register_fixed_rate(dev, "sd_pclk", sys_refclk_name, 0,
+ 100000000);
+ clks[ARTPEC6_CLK_SD_IMCLK] =
+ clk_register_fixed_rate(dev, "sd_imclk", sys_refclk_name, 0,
+ 100000000);
+ clks[ARTPEC6_CLK_I2S_HST] =
+ clk_register_fixed_factor(dev, "i2s_hst", "cpu", 0, 1, 8);
+
+ for (i = 0; i < NUM_I2S_CLOCKS; ++i) {
+ if (i2s_refclk_name && frac_clk_name[i]) {
+ i2s_mux_parents[0] = frac_clk_name[i];
+ i2s_mux_parents[1] = i2s_refclk_name;
+
+ clks[i2s_clk_indexes[i]] =
+ clk_register_mux(dev, i2s_clk_names[i],
+ i2s_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT |
+ CLK_SET_RATE_PARENT,
+ clkdata->syscon_base + 0x14, i, 1,
+ 0, &clkdata->i2scfg_lock);
+ } else if (frac_clk_name[i]) {
+ /* Lock the mux for internal clock reference. */
+ muxreg = readl(clkdata->syscon_base + 0x14);
+ muxreg &= ~BIT(i);
+ writel(muxreg, clkdata->syscon_base + 0x14);
+ clks[i2s_clk_indexes[i]] =
+ clk_register_fixed_factor(dev, i2s_clk_names[i],
+ frac_clk_name[i], 0, 1,
+ 1);
+ } else if (i2s_refclk_name) {
+ /* Lock the mux for external clock reference. */
+ muxreg = readl(clkdata->syscon_base + 0x14);
+ muxreg |= BIT(i);
+ writel(muxreg, clkdata->syscon_base + 0x14);
+ clks[i2s_clk_indexes[i]] =
+ clk_register_fixed_factor(dev, i2s_clk_names[i],
+ i2s_refclk_name, 0, 1, 1);
+ }
+ }
+
+ clks[ARTPEC6_CLK_I2C] =
+ clk_register_fixed_rate(dev, "i2c", sys_refclk_name, 0, 100000000);
+
+ clks[ARTPEC6_CLK_SYS_TIMER] =
+ clk_register_fixed_rate(dev, "timer", sys_refclk_name, 0,
+ 100000000);
+ clks[ARTPEC6_CLK_FRACDIV_IN] =
+ clk_register_fixed_rate(dev, "fracdiv_in", sys_refclk_name, 0,
+ 600000000);
+
+ for (i = 0; i < ARTPEC6_CLK_NUMCLOCKS; ++i) {
+ if (IS_ERR(clks[i]) && PTR_ERR(clks[i]) != -EPROBE_DEFER) {
+ dev_err(dev,
+ "Failed to register clock at index %d err=%ld\n",
+ i, PTR_ERR(clks[i]));
+ err = PTR_ERR(clks[i]);
+ }
+ }
+
+ return err;
+}
+
+static const struct of_device_id artpec_clkctrl_of_match[] = {
+ { .compatible = "axis,artpec6-clkctrl" },
+ {}
+};
+
+static struct platform_driver artpec6_clkctrl_driver = {
+ .probe = artpec6_clkctrl_probe,
+ .driver = {
+ .name = "artpec6_clkctrl",
+ .of_match_table = artpec_clkctrl_of_match,
+ },
+};
+
+builtin_platform_driver(artpec6_clkctrl_driver);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 12:22:13 +0000