2 * Copyright 2013 Emilio López
4 * Emilio López <emilio@elopez.com.ar>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/clk.h>
18 #include <linux/clk-provider.h>
19 #include <linux/of_address.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
23 #include "clk-factors.h"
26 * sun4i_get_mod0_factors() - calculates m, n factors for MOD0-style clocks
27 * MOD0 rate is calculated as follows
28 * rate = (parent_rate >> p) / (m + 1);
31 static void sun4i_a10_get_mod0_factors(struct factors_request *req)
35 /* These clocks can only divide, so we will never be able to achieve
36 * frequencies higher than the parent frequency */
37 if (req->rate > req->parent_rate)
38 req->rate = req->parent_rate;
40 div = DIV_ROUND_UP(req->parent_rate, req->rate);
44 else if (div / 2 < 16)
46 else if (div / 4 < 16)
51 calcm = DIV_ROUND_UP(div, 1 << calcp);
53 req->rate = (req->parent_rate >> calcp) / calcm;
58 /* user manual says "n" but it's really "p" */
59 static const struct clk_factors_config sun4i_a10_mod0_config = {
66 static const struct factors_data sun4i_a10_mod0_data = {
69 .muxmask = BIT(1) | BIT(0),
70 .table = &sun4i_a10_mod0_config,
71 .getter = sun4i_a10_get_mod0_factors,
74 static DEFINE_SPINLOCK(sun4i_a10_mod0_lock);
76 static void __init sun4i_a10_mod0_setup(struct device_node *node)
80 reg = of_iomap(node, 0);
83 * This happens with mod0 clk nodes instantiated through
84 * mfd, as those do not have their resources assigned at
85 * CLK_OF_DECLARE time yet, so do not print an error.
90 sunxi_factors_register(node, &sun4i_a10_mod0_data,
91 &sun4i_a10_mod0_lock, reg);
93 CLK_OF_DECLARE(sun4i_a10_mod0, "allwinner,sun4i-a10-mod0-clk", sun4i_a10_mod0_setup);
95 static int sun4i_a10_mod0_clk_probe(struct platform_device *pdev)
97 struct device_node *np = pdev->dev.of_node;
104 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
105 reg = devm_ioremap_resource(&pdev->dev, r);
109 sunxi_factors_register(np, &sun4i_a10_mod0_data,
110 &sun4i_a10_mod0_lock, reg);
114 static const struct of_device_id sun4i_a10_mod0_clk_dt_ids[] = {
115 { .compatible = "allwinner,sun4i-a10-mod0-clk" },
119 static struct platform_driver sun4i_a10_mod0_clk_driver = {
121 .name = "sun4i-a10-mod0-clk",
122 .of_match_table = sun4i_a10_mod0_clk_dt_ids,
124 .probe = sun4i_a10_mod0_clk_probe,
126 builtin_platform_driver(sun4i_a10_mod0_clk_driver);
128 static const struct factors_data sun9i_a80_mod0_data __initconst = {
131 .muxmask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
132 .table = &sun4i_a10_mod0_config,
133 .getter = sun4i_a10_get_mod0_factors,
136 static void __init sun9i_a80_mod0_setup(struct device_node *node)
140 reg = of_io_request_and_map(node, 0, of_node_full_name(node));
142 pr_err("Could not get registers for mod0-clk: %s\n",
147 sunxi_factors_register(node, &sun9i_a80_mod0_data,
148 &sun4i_a10_mod0_lock, reg);
150 CLK_OF_DECLARE(sun9i_a80_mod0, "allwinner,sun9i-a80-mod0-clk", sun9i_a80_mod0_setup);
152 static DEFINE_SPINLOCK(sun5i_a13_mbus_lock);
154 static void __init sun5i_a13_mbus_setup(struct device_node *node)
159 reg = of_iomap(node, 0);
161 pr_err("Could not get registers for a13-mbus-clk\n");
165 mbus = sunxi_factors_register(node, &sun4i_a10_mod0_data,
166 &sun5i_a13_mbus_lock, reg);
168 /* The MBUS clocks needs to be always enabled */
170 clk_prepare_enable(mbus);
172 CLK_OF_DECLARE(sun5i_a13_mbus, "allwinner,sun5i-a13-mbus-clk", sun5i_a13_mbus_setup);
181 #define to_mmc_phase(_hw) container_of(_hw, struct mmc_phase, hw)
183 static int mmc_get_phase(struct clk_hw *hw)
185 struct clk *mmc, *mmc_parent, *clk = hw->clk;
186 struct mmc_phase *phase = to_mmc_phase(hw);
187 unsigned int mmc_rate, mmc_parent_rate;
192 value = readl(phase->reg);
193 delay = (value >> phase->offset) & 0x3;
198 /* Get the main MMC clock */
199 mmc = clk_get_parent(clk);
204 mmc_rate = clk_get_rate(mmc);
208 /* Now, get the MMC parent (most likely some PLL) */
209 mmc_parent = clk_get_parent(mmc);
214 mmc_parent_rate = clk_get_rate(mmc_parent);
215 if (!mmc_parent_rate)
218 /* Get MMC clock divider */
219 mmc_div = mmc_parent_rate / mmc_rate;
221 step = DIV_ROUND_CLOSEST(360, mmc_div);
225 static int mmc_set_phase(struct clk_hw *hw, int degrees)
227 struct clk *mmc, *mmc_parent, *clk = hw->clk;
228 struct mmc_phase *phase = to_mmc_phase(hw);
229 unsigned int mmc_rate, mmc_parent_rate;
234 /* Get the main MMC clock */
235 mmc = clk_get_parent(clk);
240 mmc_rate = clk_get_rate(mmc);
244 /* Now, get the MMC parent (most likely some PLL) */
245 mmc_parent = clk_get_parent(mmc);
250 mmc_parent_rate = clk_get_rate(mmc_parent);
251 if (!mmc_parent_rate)
254 if (degrees != 180) {
257 /* Get MMC clock divider */
258 mmc_div = mmc_parent_rate / mmc_rate;
261 * We can only outphase the clocks by multiple of the
264 * Since the MMC clock in only a divider, and the
265 * formula to get the outphasing in degrees is deg =
266 * 360 * delta / period
268 * If we simplify this formula, we can see that the
269 * only thing that we're concerned about is the number
270 * of period we want to outphase our clock from, and
271 * the divider set by the MMC clock.
273 step = DIV_ROUND_CLOSEST(360, mmc_div);
274 delay = DIV_ROUND_CLOSEST(degrees, step);
279 spin_lock_irqsave(phase->lock, flags);
280 value = readl(phase->reg);
281 value &= ~GENMASK(phase->offset + 3, phase->offset);
282 value |= delay << phase->offset;
283 writel(value, phase->reg);
284 spin_unlock_irqrestore(phase->lock, flags);
289 static const struct clk_ops mmc_clk_ops = {
290 .get_phase = mmc_get_phase,
291 .set_phase = mmc_set_phase,
295 * sunxi_mmc_setup - Common setup function for mmc module clocks
297 * The only difference between module clocks on different platforms is the
298 * width of the mux register bits and the valid values, which are passed in
299 * through struct factors_data. The phase clocks parts are identical.
301 static void __init sunxi_mmc_setup(struct device_node *node,
302 const struct factors_data *data,
305 struct clk_onecell_data *clk_data;
310 reg = of_io_request_and_map(node, 0, of_node_full_name(node));
312 pr_err("Couldn't map the %s clock registers\n", node->name);
316 clk_data = kmalloc(sizeof(*clk_data), GFP_KERNEL);
320 clk_data->clks = kcalloc(3, sizeof(*clk_data->clks), GFP_KERNEL);
324 clk_data->clk_num = 3;
325 clk_data->clks[0] = sunxi_factors_register(node, data, lock, reg);
326 if (!clk_data->clks[0])
329 parent = __clk_get_name(clk_data->clks[0]);
331 for (i = 1; i < 3; i++) {
332 struct clk_init_data init = {
334 .parent_names = &parent,
337 struct mmc_phase *phase;
339 phase = kmalloc(sizeof(*phase), GFP_KERNEL);
343 phase->hw.init = &init;
352 if (of_property_read_string_index(node, "clock-output-names",
354 init.name = node->name;
356 clk_data->clks[i] = clk_register(NULL, &phase->hw);
357 if (IS_ERR(clk_data->clks[i])) {
363 of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
368 kfree(clk_data->clks);
373 static DEFINE_SPINLOCK(sun4i_a10_mmc_lock);
375 static void __init sun4i_a10_mmc_setup(struct device_node *node)
377 sunxi_mmc_setup(node, &sun4i_a10_mod0_data, &sun4i_a10_mmc_lock);
379 CLK_OF_DECLARE(sun4i_a10_mmc, "allwinner,sun4i-a10-mmc-clk", sun4i_a10_mmc_setup);
381 static DEFINE_SPINLOCK(sun9i_a80_mmc_lock);
383 static void __init sun9i_a80_mmc_setup(struct device_node *node)
385 sunxi_mmc_setup(node, &sun9i_a80_mod0_data, &sun9i_a80_mmc_lock);
387 CLK_OF_DECLARE(sun9i_a80_mmc, "allwinner,sun9i-a80-mmc-clk", sun9i_a80_mmc_setup);