| /* |
| * Hisilicon clock driver |
| * |
| * Copyright (c) 2013-2015 Hisilicon Limited. |
| * Copyright (c) 2017 Linaro Limited. |
| * Copyright (c) 2017 Hisilicon Limited. |
| * |
| * Author: Kai Zhao <zhaokai1@hisilicon.com> |
| * Author: Leo Yan <leo.yan@linaro.org> |
| * Author: Tao Wang <kevin.wangtao@hisilicon.com> |
| * |
| * 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <linux/version.h> |
| #include <linux/kernel.h> |
| #include <linux/clk.h> |
| #include <linux/clk-provider.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/device.h> |
| #include <linux/init.h> |
| #include <linux/sched.h> |
| #include <linux/clkdev.h> |
| #include <linux/delay.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/of_device.h> |
| #include <linux/mailbox_client.h> |
| #include <dt-bindings/clock/hi3660-clock.h> |
| |
| #define FREQ_DATA_OFFSET 0x70 |
| #define MHZ 1000000 |
| |
| struct hi3660_stub_clk_chan { |
| struct mbox_client cl; |
| struct mbox_chan *mbox; |
| }; |
| |
| struct hi3660_stub_clk { |
| unsigned int id; |
| struct device *dev; |
| struct clk_hw hw; |
| const char *clk_name; |
| unsigned int set_rate_cmd; |
| unsigned int msg[8]; |
| unsigned int rate; |
| }; |
| |
| static void __iomem *freq_reg; |
| static struct hi3660_stub_clk_chan *chan; |
| |
| static struct hi3660_stub_clk hisi_stub_clk[HI3660_CLK_STUB_NUM] = { |
| [HI3660_CLK_STUB_CLUSTER0] = { |
| .id = HI3660_CLK_STUB_CLUSTER0, |
| .clk_name = "cpu-cluster.0", |
| .set_rate_cmd = 0x0001030A, |
| }, |
| [HI3660_CLK_STUB_CLUSTER1] = { |
| .id = HI3660_CLK_STUB_CLUSTER1, |
| .clk_name = "cpu-cluster.1", |
| .set_rate_cmd = 0x0002030A, |
| }, |
| [HI3660_CLK_STUB_GPU] = { |
| .id = HI3660_CLK_STUB_GPU, |
| .clk_name = "clk-g3d", |
| .set_rate_cmd = 0x0003030A, |
| }, |
| [HI3660_CLK_STUB_DDR] = { |
| .id = HI3660_CLK_STUB_DDR, |
| .clk_name = "clk-ddrc", |
| .set_rate_cmd = 0x0004030A, |
| }, |
| [HI3660_CLK_STUB_DDR_VOTE] = { |
| .id = HI3660_CLK_STUB_DDR_VOTE, |
| .clk_name = "clk-ddrc-vote", |
| .set_rate_cmd = 0x00040309, |
| }, |
| [HI3660_CLK_STUB_DDR_LIMIT] = { |
| .id = HI3660_CLK_STUB_DDR_LIMIT, |
| .clk_name = "clk-ddrc-limit", |
| .set_rate_cmd = 0x00040308, |
| }, |
| }; |
| |
| static unsigned long hi3660_stub_clk_recalc_rate( |
| struct clk_hw *hw, unsigned long parent_rate) |
| { |
| struct hi3660_stub_clk *stub_clk = |
| container_of(hw, struct hi3660_stub_clk, hw); |
| |
| if (stub_clk->id < HI3660_CLK_STUB_DDR_VOTE) |
| stub_clk->rate = readl(freq_reg + (stub_clk->id << 2)) * MHZ; |
| |
| pr_debug("get rate%d;%u\n", stub_clk->id, stub_clk->rate); |
| |
| return stub_clk->rate; |
| } |
| |
| static long hi3660_stub_clk_round_rate(struct clk_hw *hw, unsigned long rate, |
| unsigned long *prate) |
| { |
| return rate; |
| } |
| |
| int hi3660_stub_clk_determine_rate(struct clk_hw *hw, |
| struct clk_rate_request *req) |
| { |
| pr_debug("%s: enter %ld\n", __func__, req->rate); |
| return 0; |
| } |
| |
| static int hi3660_stub_clk_set_rate(struct clk_hw *hw, unsigned long rate, |
| unsigned long parent_rate) |
| { |
| struct hi3660_stub_clk *stub_clk = |
| container_of(hw, struct hi3660_stub_clk, hw); |
| |
| if (stub_clk->id < HI3660_CLK_STUB_NUM) { |
| stub_clk->msg[0] = stub_clk->set_rate_cmd; |
| stub_clk->msg[1] = rate / MHZ; |
| |
| pr_debug("%s: set_rate_cmd[0] %x [1] %x\n", __func__, |
| stub_clk->msg[0], stub_clk->msg[1]); |
| |
| mbox_send_message(chan->mbox, stub_clk->msg); |
| } |
| |
| stub_clk->rate = rate; |
| return 0; |
| } |
| |
| static struct clk_ops hi3660_stub_clk_ops = { |
| .recalc_rate = hi3660_stub_clk_recalc_rate, |
| .determine_rate = hi3660_stub_clk_determine_rate, |
| .round_rate = hi3660_stub_clk_round_rate, |
| .set_rate = hi3660_stub_clk_set_rate, |
| }; |
| |
| static struct clk *hi3660_register_stub_clk(struct device *dev, |
| struct hi3660_stub_clk *stub_clk) |
| { |
| struct clk_init_data init = {}; |
| struct clk *clk; |
| |
| stub_clk->hw.init = &init; |
| stub_clk->dev = dev; |
| |
| init.name = stub_clk->clk_name; |
| init.ops = &hi3660_stub_clk_ops; |
| init.num_parents = 0; |
| init.flags = CLK_IS_ROOT | CLK_GET_RATE_NOCACHE; |
| |
| clk = devm_clk_register(dev, &stub_clk->hw); |
| if (!IS_ERR(clk)) |
| dev_dbg(dev, "Registered clock '%s'\n", init.name); |
| |
| return clk; |
| } |
| |
| static int hi3660_stub_clk_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *np = pdev->dev.of_node; |
| struct clk_onecell_data *data; |
| struct resource *res; |
| struct clk **clk_table; |
| struct clk *clk; |
| unsigned int idx; |
| |
| data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
| if (!data) { |
| dev_err(dev, "could not allocate clock data\n"); |
| return -ENOMEM; |
| } |
| |
| clk_table = devm_kzalloc(dev, |
| sizeof(*clk_table) * HI3660_CLK_STUB_NUM, GFP_KERNEL); |
| if (!clk_table) { |
| dev_err(dev, "could not allocate clock lookup table\n"); |
| return -ENOMEM; |
| } |
| data->clks = clk_table; |
| data->clk_num = HI3660_CLK_STUB_NUM; |
| |
| chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL); |
| if (!chan) { |
| dev_err(dev, "failed to allocate memory for mbox\n"); |
| return -ENOMEM; |
| } |
| |
| /* Use mailbox client with blocking mode */ |
| chan->cl.dev = dev; |
| chan->cl.tx_done = NULL; |
| chan->cl.tx_block = false; |
| chan->cl.tx_tout = 500; |
| chan->cl.knows_txdone = false; |
| |
| /* Allocate mailbox channel */ |
| chan->mbox = mbox_request_channel(&chan->cl, 0); |
| if (IS_ERR(chan->mbox)) { |
| dev_err(dev, "failed get mailbox channel\n"); |
| return PTR_ERR(chan->mbox); |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| freq_reg = devm_ioremap(dev, res->start, resource_size(res)); |
| if (IS_ERR(freq_reg)) { |
| dev_err(dev, "failed get shared memory\n"); |
| return -ENOMEM; |
| } |
| freq_reg += FREQ_DATA_OFFSET; |
| |
| for (idx = 0; idx < HI3660_CLK_STUB_NUM; idx++) { |
| clk = hi3660_register_stub_clk(dev, &hisi_stub_clk[idx]); |
| if (IS_ERR(clk)) |
| return PTR_ERR(clk); |
| |
| data->clks[idx] = clk; |
| } |
| of_clk_add_provider(np, of_clk_src_onecell_get, data); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id hi3660_stub_clk_of_match[] = { |
| { .compatible = "hisilicon,hi3660-stub-clk", }, |
| {} |
| }; |
| |
| static struct platform_driver hi3660_stub_clk_driver = { |
| .driver = { |
| .name = "hi3660-stub-clk", |
| .of_match_table = hi3660_stub_clk_of_match, |
| }, |
| .probe = hi3660_stub_clk_probe, |
| }; |
| |
| static int __init hi3660_stub_clk_init(void) |
| { |
| return platform_driver_register(&hi3660_stub_clk_driver); |
| } |
| subsys_initcall(hi3660_stub_clk_init); |