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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/clk/clk-mb86s7x.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/clk/clk-mb86s7x.c')
-rw-r--r-- | kernel/drivers/clk/clk-mb86s7x.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/kernel/drivers/clk/clk-mb86s7x.c b/kernel/drivers/clk/clk-mb86s7x.c new file mode 100644 index 000000000..f39c25a22 --- /dev/null +++ b/kernel/drivers/clk/clk-mb86s7x.c @@ -0,0 +1,386 @@ +/* + * Copyright (C) 2013-2015 FUJITSU SEMICONDUCTOR LIMITED + * Copyright (C) 2015 Linaro Ltd. + * + * 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 <soc/mb86s7x/scb_mhu.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 mb86s7x_peri_clk { + u32 payload_size; + u32 cntrlr; + u32 domain; + u32 port; + u32 en; + u64 frequency; +} __packed __aligned(4); + +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; + int ret; + + cmd.payload_size = sizeof(cmd); + cmd.cntrlr = crgclk->cntrlr; + cmd.domain = crgclk->domain; + cmd.port = crgclk->port; + cmd.en = en; + + /* Port 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); + + ret = mb86s7x_send_packet(CMD_PERI_CLOCK_GATE_SET_REQ, + &cmd, sizeof(cmd)); + if (ret < 0) { + pr_err("%s:%d failed!\n", __func__, __LINE__); + return ret; + } + + 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; + int code, ret; + + cmd.payload_size = sizeof(cmd); + cmd.cntrlr = crgclk->cntrlr; + cmd.domain = crgclk->domain; + cmd.port = crgclk->port; + cmd.frequency = *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.frequency); + } 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); + } + + ret = mb86s7x_send_packet(code, &cmd, sizeof(cmd)); + if (ret < 0) { + pr_err("%s:%d failed!\n", __func__, __LINE__); + return ret; + } + + 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.frequency); + 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.frequency); + + *rate = cmd.frequency; + 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, +}; + +struct mb86s70_crg11 { + struct mutex lock; /* protects CLK populating and searching */ +}; + +static struct clk *crg11_get(struct of_phandle_args *clkspec, void *data) +{ + struct mb86s70_crg11 *crg11 = data; + struct clk_init_data init; + u32 cntrlr, domain, port; + struct crg_clk *crgclk; + struct clk *clk; + char clkp[20]; + + if (clkspec->args_count != 3) + return ERR_PTR(-EINVAL); + + cntrlr = clkspec->args[0]; + domain = clkspec->args[1]; + port = clkspec->args[2]; + + if (port > 7) + snprintf(clkp, 20, "UngatedCLK%d_%X", cntrlr, domain); + else + snprintf(clkp, 20, "CLK%d_%X_%d", cntrlr, domain, port); + + mutex_lock(&crg11->lock); + + clk = __clk_lookup(clkp); + if (clk) { + mutex_unlock(&crg11->lock); + return clk; + } + + crgclk = kzalloc(sizeof(*crgclk), GFP_KERNEL); + if (!crgclk) { + mutex_unlock(&crg11->lock); + return ERR_PTR(-ENOMEM); + } + + 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); + + clk_register_clkdev(clk, clkp, NULL); + mutex_unlock(&crg11->lock); + return clk; +} + +static void __init crg_port_init(struct device_node *node) +{ + struct mb86s70_crg11 *crg11; + + crg11 = kzalloc(sizeof(*crg11), GFP_KERNEL); + if (!crg11) + return; + + mutex_init(&crg11->lock); + + of_clk_add_provider(node, crg11_get, crg11); +} +CLK_OF_DECLARE(crg11_gate, "fujitsu,mb86s70-crg11", crg_port_init); + +struct cl_clk { + struct clk_hw hw; + int cluster; +}; + +struct mb86s7x_cpu_freq { + u32 payload_size; + u32 cluster_class; + u32 cluster_id; + u32 cpu_id; + u64 frequency; +}; + +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; + int code, ret; + + cmd.payload_size = sizeof(cmd); + cmd.cluster_class = 0; + cmd.cluster_id = clc->cluster; + cmd.cpu_id = 0; + cmd.frequency = *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.frequency); + + ret = mb86s7x_send_packet(code, &cmd, sizeof(cmd)); + if (ret < 0) { + pr_err("%s:%d failed!\n", __func__, __LINE__); + return; + } + + 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.frequency); + + *rate = cmd.frequency; +} + +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) + 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, ret = -ENODEV; + struct device_node *np; + struct clk *clk; + + np = of_find_compatible_node(NULL, NULL, "fujitsu,mb86s70-scb-1.0"); + if (!np || !of_device_is_available(np)) + goto exit; + + 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)); + } + ret = 0; + + platform_device_register_simple("arm-bL-cpufreq-dt", -1, NULL, 0); +exit: + of_node_put(np); + return ret; +} +module_init(mb86s7x_clclk_of_init); |