* [PATCH v3 2/2] clk: add artpec-6 clock controller
2016-02-24 8:38 [PATCH v3 0/2] clk: Add Artpec-6 SoC support Lars Persson
2016-02-24 8:38 ` [PATCH v3 1/2] clk: add device tree binding for Artpec-6 clock controller Lars Persson
@ 2016-02-24 8:38 ` Lars Persson
1 sibling, 0 replies; 3+ messages in thread
From: Lars Persson @ 2016-02-24 8:38 UTC (permalink / raw)
To: devicetree, linux-clk
Cc: mturquette, sboyd, robh+dt, pawel.moll, mark.rutland,
ijc+devicetree, galak, linux-kernel, Lars Persson
Add a driver for the main clock controller of the Artpec-6 Soc.
Signed-off-by: Lars Persson <larper@axis.com>
---
drivers/clk/Makefile | 1 +
drivers/clk/axis/Makefile | 1 +
drivers/clk/axis/clk-artpec6.c | 177 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 179 insertions(+)
create mode 100644 drivers/clk/axis/Makefile
create mode 100644 drivers/clk/axis/clk-artpec6.c
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index b038e36..8cd72e7 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o
obj-$(CONFIG_COMMON_CLK_PWM) += clk-pwm.o
obj-$(CONFIG_COMMON_CLK_AT91) += at91/
+obj-$(CONFIG_ARCH_ARTPEC) += axis/
obj-y += bcm/
obj-$(CONFIG_ARCH_BERLIN) += berlin/
obj-$(CONFIG_ARCH_HISI) += hisilicon/
diff --git a/drivers/clk/axis/Makefile b/drivers/clk/axis/Makefile
new file mode 100644
index 0000000..628c9d3
--- /dev/null
+++ b/drivers/clk/axis/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_MACH_ARTPEC6) += clk-artpec6.o
diff --git a/drivers/clk/axis/clk-artpec6.c b/drivers/clk/axis/clk-artpec6.c
new file mode 100644
index 0000000..c1e3048
--- /dev/null
+++ b/drivers/clk/axis/clk-artpec6.c
@@ -0,0 +1,177 @@
+/*
+ * ARTPEC-6 clock initialization
+ *
+ * Copyright 2015-2016 Axis Comunications AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <dt-bindings/clock/axis,artpec6-clkctrl.h>
+
+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 void of_artpec6_clkctrl_setup(struct device_node *np)
+{
+ int propidx;
+ const char *i2s_refclk_name = NULL;
+ const char *frac_clk_name = NULL;
+ struct clk *sys_refclk;
+ const char *sys_refclk_name;
+ const char *i2s_mux_parents[2] = { NULL, NULL };
+ u32 pll_mode, pll_m, pll_n;
+
+ /* Mandatory parent clock. */
+ sys_refclk = of_clk_get_by_name(np, "sys_refclk");
+ if (IS_ERR(sys_refclk))
+ return;
+
+ sys_refclk_name = __clk_get_name(sys_refclk);
+ if (!sys_refclk_name)
+ return;
+
+ clkdata = kzalloc(sizeof(*clkdata), GFP_KERNEL);
+ if (!clkdata)
+ return;
+
+ /* 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_clk");
+ if (propidx >= 0)
+ frac_clk_name = of_clk_get_parent_name(np, propidx);
+
+ spin_lock_init(&clkdata->i2scfg_lock);
+
+ clkdata->syscon_base = of_iomap(np, 0);
+
+ /* 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;
+ }
+
+ clkdata->clk_table[ARTPEC6_CLK_CPU] =
+ clk_register_fixed_factor(NULL, "cpu", sys_refclk_name, 0, pll_n,
+ pll_m);
+ clkdata->clk_table[ARTPEC6_CLK_CPU_PERIPH] =
+ clk_register_fixed_factor(NULL, "cpu_periph", "cpu", 0, 1, 2);
+ clkdata->clk_table[ARTPEC6_CLK_NAND_CLKA] =
+ clk_register_fixed_factor(NULL, "nand_clka", "cpu", 0, 1, 8);
+ clkdata->clk_table[ARTPEC6_CLK_NAND_CLKB] =
+ clk_register_fixed_rate(NULL, "nand_clkb", sys_refclk_name, 0,
+ 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_ETH_ACLK] =
+ clk_register_fixed_factor(NULL, "eth_aclk", "cpu", 0, 1, 4);
+ clkdata->clk_table[ARTPEC6_CLK_DMA_ACLK] =
+ clk_register_fixed_factor(NULL, "dma_aclk", "cpu", 0, 1, 4);
+ clkdata->clk_table[ARTPEC6_CLK_PTP_REF] =
+ clk_register_fixed_rate(NULL, "ptp_ref", sys_refclk_name, 0,
+ 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_SD_PCLK] =
+ clk_register_fixed_rate(NULL, "sd_pclk", sys_refclk_name, 0,
+ 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_SD_IMCLK] =
+ clk_register_fixed_rate(NULL, "sd_imclk", sys_refclk_name, 0,
+ 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_I2S_HST] =
+ clk_register_fixed_factor(NULL, "i2s_hst", "cpu", 0, 1, 8);
+
+ if (i2s_refclk_name && frac_clk_name) {
+ i2s_mux_parents[0] = frac_clk_name;
+ i2s_mux_parents[1] = i2s_refclk_name;
+
+ clkdata->clk_table[ARTPEC6_CLK_I2S0_CLK] =
+ clk_register_mux(NULL, "i2s0", i2s_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT |
+ CLK_SET_RATE_PARENT,
+ clkdata->syscon_base + 0x14, 0, 1, 0,
+ &clkdata->i2scfg_lock);
+
+ clkdata->clk_table[ARTPEC6_CLK_I2S1_CLK] =
+ clk_register_mux(NULL, "i2s1", i2s_mux_parents, 2,
+ CLK_SET_RATE_NO_REPARENT |
+ CLK_SET_RATE_PARENT,
+ clkdata->syscon_base + 0x14, 1, 1, 0,
+ &clkdata->i2scfg_lock);
+ } else if (frac_clk_name) {
+ /* Lock the mux for internal clock reference. */
+ writel(0x0, clkdata->syscon_base + 0x14);
+ clkdata->clk_table[ARTPEC6_CLK_I2S0_CLK] =
+ clk_register_fixed_factor(NULL, "i2s0", frac_clk_name,
+ 0, 1, 1);
+ clkdata->clk_table[ARTPEC6_CLK_I2S1_CLK] =
+ clk_register_fixed_factor(NULL, "i2s1", frac_clk_name,
+ 0, 1, 1);
+ } else if (i2s_refclk_name) {
+ /* Lock the mux for external clock reference. */
+ writel(0x3, clkdata->syscon_base + 0x14);
+ clkdata->clk_table[ARTPEC6_CLK_I2S0_CLK] =
+ clk_register_fixed_factor(NULL, "i2s0", i2s_refclk_name,
+ 0, 1, 1);
+ clkdata->clk_table[ARTPEC6_CLK_I2S1_CLK] =
+ clk_register_fixed_factor(NULL, "i2s1", i2s_refclk_name,
+ 0, 1, 1);
+ }
+
+ clkdata->clk_table[ARTPEC6_CLK_UART_PCLK] =
+ clk_register_fixed_factor(NULL, "uart_pclk", "cpu", 0, 1, 8);
+ clkdata->clk_table[ARTPEC6_CLK_UART_REFCLK] =
+ clk_register_fixed_rate(NULL, "uart_ref", sys_refclk_name, 0,
+ 50000000);
+ clkdata->clk_table[ARTPEC6_CLK_I2C] =
+ clk_register_fixed_rate(NULL, "i2c", sys_refclk_name, 0, 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_SPI_PCLK] =
+ clk_register_fixed_factor(NULL, "spi_pclk", "cpu", 0, 1, 8);
+ clkdata->clk_table[ARTPEC6_CLK_SPI_SSPCLK] =
+ clk_register_fixed_rate(NULL, "spi_sspclk", sys_refclk_name, 0,
+ 50000000);
+ clkdata->clk_table[ARTPEC6_CLK_SYS_TIMER] =
+ clk_register_fixed_rate(NULL, "timer", sys_refclk_name, 0,
+ 100000000);
+ clkdata->clk_table[ARTPEC6_CLK_FRACDIV_IN] =
+ clk_register_fixed_rate(NULL, "fracdiv_in", sys_refclk_name, 0,
+ 600000000);
+ clkdata->clk_table[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(artpec6_clkctrl, "axis,artpec6-clkctrl",
+ of_artpec6_clkctrl_setup);
--
2.1.4
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