[PATCH 4/8] clk: Add clock driver for mb86s7x
Mollie Wu
mollie.wu at linaro.org
Sat Jul 12 23:30:52 PDT 2014
The CRG11 clock controller is managed by remote f/w.
This driver simply maps Linux CLK ops onto mailbox api.
Signed-off-by: Jassi Brar <jaswinder.singh at linaro.org>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Olof <olof at lixom.net>
Cc: Russell King <linux at arm.linux.org.uk>
Signed-off-by: Tetsuya Takinishi <t.takinishi at jp.fujitsu.com>
Signed-off-by: Mollie Wu <mollie.wu at linaro.org>
---
.../bindings/clock/fujitsu,mb86s7x_clk.txt | 32 ++
drivers/clk/Makefile | 1 +
drivers/clk/clk-mb86s7x.c | 352 +++++++++++++++++++++
3 files changed, 385 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/fujitsu,mb86s7x_clk.txt
create mode 100644 drivers/clk/clk-mb86s7x.c
diff --git a/Documentation/devicetree/bindings/clock/fujitsu,mb86s7x_clk.txt b/Documentation/devicetree/bindings/clock/fujitsu,mb86s7x_clk.txt
new file mode 100644
index 0000000..4a17d79
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/fujitsu,mb86s7x_clk.txt
@@ -0,0 +1,32 @@
+Fujitsu CRG11 clock driver bindings
+-----------------------------------
+
+Required properties :
+- compatible : Shall contain "fujitsu,mb86s7x_clk"
+- #clock-cells : Shall be 0
+- cntrlr : 0->ALW, 1->DDR3, 2->MAIN, 3->CA15, 4->HDMI, 5->DPHY
+- domain : [0, 15]
+- port : [0,7] -> Gateable Clock Ports. [8]->UngatedCLK
+
+The consumer specifies the desired clock pointing to its phandle.
+
+Example:
+
+ clk_alw_2_1: clk_alw_2_1 {
+ compatible = "fujitsu,mb86s7x_clk";
+ #clock-cells = <0>;
+ cntrlr = <0>;
+ domain = <2>;
+ port = <1>;
+ };
+
+ mhu: mhu0 at 2b1f0000 {
+ #mbox-cells = <1>;
+ compatible = "fujitsu,mhu";
+ reg = <0 0x2B1F0000 0x1000>;
+ interrupts = <0 36 4>, /* LP Non-Sec */
+ <0 35 4>, /* HP Non-Sec */
+ <0 37 4>; /* Secure */
+ clocks = <&clk_alw_2_1>;
+ clock-names = "clk";
+ };
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 567f102..ccbce66 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o
obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o
obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o
+obj-$(CONFIG_ARCH_MB86S7X) += clk-mb86s7x.o
obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
diff --git a/drivers/clk/clk-mb86s7x.c b/drivers/clk/clk-mb86s7x.c
new file mode 100644
index 0000000..ddb5f13
--- /dev/null
+++ b/drivers/clk/clk-mb86s7x.c
@@ -0,0 +1,352 @@
+/*
+ * Copyright (C) 2013-2014 FUJITSU SEMICONDUCTOR LIMITED
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/cpu.h>
+#include <linux/clk-provider.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
+#include <linux/topology.h>
+#include <linux/mailbox_client.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/mb86s7x_mbox.h>
+
+#define to_crg_clk(p) container_of(p, struct crg_clk, hw)
+#define to_clc_clk(p) container_of(p, struct cl_clk, hw)
+
+struct hack_rate {
+ unsigned clk_id;
+ unsigned long rate;
+ int gated;
+};
+
+struct crg_clk {
+ struct clk_hw hw;
+ u8 cntrlr, domain, port;
+};
+
+static int crg_gate_control(struct clk_hw *hw, int en)
+{
+ struct crg_clk *crgclk = to_crg_clk(hw);
+ struct mb86s7x_peri_clk cmd;
+ struct completion got_rsp;
+ int ret;
+
+ cmd.payload_size = sizeof(cmd);
+ cmd.cntrlr = crgclk->cntrlr;
+ cmd.domain = crgclk->domain;
+ cmd.port = crgclk->port;
+ cmd.en = en;
+
+ /* Port-8 is UngatedCLK */
+ if (cmd.port == 8)
+ return en ? 0 : -EINVAL;
+
+ pr_debug("%s:%d CMD Cntrlr-%u Dom-%u Port-%u En-%u}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port, cmd.en);
+
+ init_completion(&got_rsp);
+ ret = mhu_send_packet(CMD_PERI_CLOCK_GATE_SET_REQ,
+ &cmd, sizeof(cmd), &got_rsp);
+ if (ret < 0) {
+ pr_err("%s:%d failed!\n", __func__, __LINE__);
+ return ret;
+ }
+ if (ret)
+ wait_for_completion(&got_rsp);
+
+ pr_debug("%s:%d REP Cntrlr-%u Dom-%u Port-%u En-%u}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port, cmd.en);
+
+ /* If the request was rejected */
+ if (cmd.en != en)
+ ret = -EINVAL;
+ else
+ ret = 0;
+
+ return ret;
+}
+
+static int crg_port_prepare(struct clk_hw *hw)
+{
+ return crg_gate_control(hw, 1);
+}
+
+static void crg_port_unprepare(struct clk_hw *hw)
+{
+ crg_gate_control(hw, 0);
+}
+
+static int
+crg_rate_control(struct clk_hw *hw, int set, unsigned long *rate)
+{
+ struct crg_clk *crgclk = to_crg_clk(hw);
+ struct mb86s7x_peri_clk cmd;
+ struct completion got_rsp;
+ int code, ret;
+
+ cmd.payload_size = sizeof(cmd);
+ cmd.cntrlr = crgclk->cntrlr;
+ cmd.domain = crgclk->domain;
+ cmd.port = crgclk->port;
+ cmd.freqency = *rate;
+
+ if (set) {
+ code = CMD_PERI_CLOCK_RATE_SET_REQ;
+ pr_debug("%s:%d CMD Cntrlr-%u Dom-%u Port-%u Rate-SET %lluHz}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port, cmd.freqency);
+ } else {
+ code = CMD_PERI_CLOCK_RATE_GET_REQ;
+ pr_debug("%s:%d CMD Cntrlr-%u Dom-%u Port-%u Rate-GET}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port);
+ }
+
+ init_completion(&got_rsp);
+ ret = mhu_send_packet(code, &cmd, sizeof(cmd), &got_rsp);
+ if (ret < 0) {
+ pr_err("%s:%d failed!\n", __func__, __LINE__);
+ return ret;
+ }
+ if (ret)
+ wait_for_completion(&got_rsp);
+
+ if (set)
+ pr_debug("%s:%d REP Cntrlr-%u Dom-%u Port-%u Rate-SET %lluHz}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port, cmd.freqency);
+ else
+ pr_debug("%s:%d REP Cntrlr-%u Dom-%u Port-%u Rate-GOT %lluHz}\n",
+ __func__, __LINE__, cmd.cntrlr,
+ cmd.domain, cmd.port, cmd.freqency);
+
+ *rate = cmd.freqency;
+ return 0;
+}
+
+static unsigned long
+crg_port_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
+{
+ unsigned long rate;
+
+ crg_rate_control(hw, 0, &rate);
+
+ return rate;
+}
+
+static long
+crg_port_round_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long *pr)
+{
+ return rate;
+}
+
+static int
+crg_port_set_rate(struct clk_hw *hw,
+ unsigned long rate, unsigned long parent_rate)
+{
+ return crg_rate_control(hw, 1, &rate);
+}
+
+const struct clk_ops crg_port_ops = {
+ .prepare = crg_port_prepare,
+ .unprepare = crg_port_unprepare,
+ .recalc_rate = crg_port_recalc_rate,
+ .round_rate = crg_port_round_rate,
+ .set_rate = crg_port_set_rate,
+};
+
+static void __init crg_port_init(struct device_node *node)
+{
+ struct clk_init_data init;
+ u32 cntrlr, domain, port;
+ struct crg_clk *crgclk;
+ struct clk *clk;
+ char clkp[20];
+ int rc;
+
+ rc = of_property_read_u32(node, "cntrlr", &cntrlr);
+ if (WARN_ON(rc))
+ return;
+ rc = of_property_read_u32(node, "domain", &domain);
+ if (WARN_ON(rc))
+ return;
+ rc = of_property_read_u32(node, "port", &port);
+ if (WARN_ON(rc))
+ return;
+
+ if (port > 7)
+ snprintf(clkp, 20, "UngatedCLK%d_%X", cntrlr, domain);
+ else
+ snprintf(clkp, 20, "CLK%d_%X_%d", cntrlr, domain, port);
+
+ clk = __clk_lookup(clkp);
+ if (clk)
+ return;
+
+ crgclk = kzalloc(sizeof(*crgclk), GFP_KERNEL);
+ if (!crgclk)
+ return;
+ init.name = clkp;
+ init.num_parents = 0;
+ init.ops = &crg_port_ops;
+ init.flags = CLK_IS_ROOT;
+ crgclk->hw.init = &init;
+ crgclk->cntrlr = cntrlr;
+ crgclk->domain = domain;
+ crgclk->port = port;
+ clk = clk_register(NULL, &crgclk->hw);
+ if (IS_ERR(clk))
+ pr_err("%s:%d Error!\n", __func__, __LINE__);
+ else
+ pr_debug("Registered %s\n", clkp);
+
+ of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ clk_register_clkdev(clk, clkp, NULL);
+}
+CLK_OF_DECLARE(crg11_gate, "fujitsu,mb86s7x_clk", crg_port_init);
+
+struct cl_clk {
+ struct clk_hw hw;
+ int cluster;
+};
+
+static void mhu_cluster_rate(struct clk_hw *hw, unsigned long *rate, int get)
+{
+ struct cl_clk *clc = to_clc_clk(hw);
+ struct mb86s7x_cpu_freq cmd;
+ struct completion got_rsp;
+ int code, ret;
+
+ cmd.payload_size = sizeof(cmd);
+ cmd.cluster_class = 0;
+ cmd.cluster_id = clc->cluster;
+ cmd.cpu_id = 0;
+ cmd.freqency = *rate;
+
+ if (get)
+ code = CMD_CPU_CLOCK_RATE_GET_REQ;
+ else
+ code = CMD_CPU_CLOCK_RATE_SET_REQ;
+
+ pr_debug("%s:%d CMD Cl_Class-%u CL_ID-%u CPU_ID-%u Freq-%llu}\n",
+ __func__, __LINE__, cmd.cluster_class,
+ cmd.cluster_id, cmd.cpu_id, cmd.freqency);
+
+ init_completion(&got_rsp);
+ ret = mhu_send_packet(code, &cmd, sizeof(cmd), &got_rsp);
+ if (ret < 0) {
+ pr_err("%s:%d failed!\n", __func__, __LINE__);
+ return;
+ }
+ if (ret)
+ wait_for_completion(&got_rsp);
+
+ pr_debug("%s:%d REP Cl_Class-%u CL_ID-%u CPU_ID-%u Freq-%llu}\n",
+ __func__, __LINE__, cmd.cluster_class,
+ cmd.cluster_id, cmd.cpu_id, cmd.freqency);
+
+ *rate = cmd.freqency;
+}
+
+static unsigned long
+clc_recalc_rate(struct clk_hw *hw, unsigned long unused)
+{
+ unsigned long rate;
+
+ mhu_cluster_rate(hw, &rate, 1);
+ return rate;
+}
+
+static long
+clc_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *unused)
+{
+ return rate;
+}
+
+static int
+clc_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long unused)
+{
+ unsigned long res = rate;
+
+ mhu_cluster_rate(hw, &res, 0);
+
+ return (res == rate) ? 0 : -EINVAL;
+}
+
+static struct clk_ops clk_clc_ops = {
+ .recalc_rate = clc_recalc_rate,
+ .round_rate = clc_round_rate,
+ .set_rate = clc_set_rate,
+};
+
+struct clk *mb86s7x_clclk_register(struct device *cpu_dev)
+{
+ struct clk_init_data init;
+ struct cl_clk *clc;
+
+ clc = kzalloc(sizeof(*clc), GFP_KERNEL);
+ if (!clc) {
+ pr_err("could not allocate cl_clk\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ clc->hw.init = &init;
+ clc->cluster = topology_physical_package_id(cpu_dev->id);
+
+ init.name = dev_name(cpu_dev);
+ init.ops = &clk_clc_ops;
+ init.flags = CLK_IS_ROOT | CLK_GET_RATE_NOCACHE;
+ init.num_parents = 0;
+
+ return devm_clk_register(cpu_dev, &clc->hw);
+}
+
+static int mb86s7x_clclk_of_init(void)
+{
+ int cpu;
+ struct clk *clk;
+
+ for_each_possible_cpu(cpu) {
+ struct device *cpu_dev = get_cpu_device(cpu);
+
+ if (!cpu_dev) {
+ pr_err("failed to get cpu%d device\n", cpu);
+ continue;
+ }
+
+ clk = mb86s7x_clclk_register(cpu_dev);
+ if (IS_ERR(clk)) {
+ pr_err("failed to register cpu%d clock\n", cpu);
+ continue;
+ }
+ if (clk_register_clkdev(clk, NULL, dev_name(cpu_dev))) {
+ pr_err("failed to register cpu%d clock lookup\n", cpu);
+ continue;
+ }
+ pr_debug("registered clk for %s\n", dev_name(cpu_dev));
+ }
+
+ platform_device_register_simple("arm-bL-cpufreq-dt", -1, NULL, 0);
+
+ return 0;
+}
+module_init(mb86s7x_clclk_of_init);
--
1.8.1.2
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