1 // SPDX-License-Identifier: GPL-2.0
13 #include <linux/clk-provider.h>
14 #include <linux/arm-smccc.h>
40  * +----------+       |\            +------+
41  * | dram_pll |-------|M| dram_core |      |
42  * +----------+       |U|---------->| D    |
43  *                 /--|X|           |  D   |
46  *            +---------+           |      |
48  *            +---------+           |      |
50  * +----------+    |                |      |
51  * | dram_alt |----/                |      |
52  * +----------+                     |      |
53  * | dram_apb |-------------------->|      |
54  * +----------+                     +------+
58  * Frequency switching is implemented in TF-A (via SMC call) and can change the
86 	 * Firmware reports values in MT/s, so we round-down from Hz  in imx8m_ddrc_find_freq()
90 	for (i = 0; i < priv->freq_count; ++i) {  in imx8m_ddrc_find_freq()
91 		freq = &priv->freq_table[i];  in imx8m_ddrc_find_freq()
92 		if (freq->rate == rate ||  in imx8m_ddrc_find_freq()
93 				freq->rate + 1 == rate ||  in imx8m_ddrc_find_freq()
94 				freq->rate - 1 == rate)  in imx8m_ddrc_find_freq()
125 	return hw ? hw->clk : NULL;  in clk_get_parent_by_index()
143 			priv->dram_core, freq->dram_core_parent_index - 1);  in imx8m_ddrc_set_freq()
146 		return -EINVAL;  in imx8m_ddrc_set_freq()
148 	if (freq->dram_alt_parent_index) {  in imx8m_ddrc_set_freq()
150 				priv->dram_alt,  in imx8m_ddrc_set_freq()
151 				freq->dram_alt_parent_index - 1);  in imx8m_ddrc_set_freq()
154 			return -EINVAL;  in imx8m_ddrc_set_freq()
159 	if (freq->dram_apb_parent_index) {  in imx8m_ddrc_set_freq()
161 				priv->dram_apb,  in imx8m_ddrc_set_freq()
162 				freq->dram_apb_parent_index - 1);  in imx8m_ddrc_set_freq()
165 			return -EINVAL;  in imx8m_ddrc_set_freq()
190 	imx8m_ddrc_smc_set_freq(freq->smcarg);  in imx8m_ddrc_set_freq()
193 	ret = clk_set_parent(priv->dram_core, new_dram_core_parent);  in imx8m_ddrc_set_freq()
197 		ret = clk_set_parent(priv->dram_alt, new_dram_alt_parent);  in imx8m_ddrc_set_freq()
203 		ret = clk_set_parent(priv->dram_apb, new_dram_apb_parent);  in imx8m_ddrc_set_freq()
215 	clk_get_rate(priv->dram_pll);  in imx8m_ddrc_set_freq()
246 	old_freq = clk_get_rate(priv->dram_core);  in imx8m_ddrc_target()
252 		return -EINVAL;  in imx8m_ddrc_target()
260 	new_freq = clk_get_rate(priv->dram_core);  in imx8m_ddrc_target()
278 	*freq = clk_get_rate(priv->dram_core);  in imx8m_ddrc_get_cur_freq()
288 	stat->busy_time = 0;  in imx8m_ddrc_get_dev_status()
289 	stat->total_time = 0;  in imx8m_ddrc_get_dev_status()
290 	stat->current_frequency = clk_get_rate(priv->dram_core);  in imx8m_ddrc_get_dev_status()
304 	priv->freq_count = res.a0;  in imx8m_ddrc_init_freq_info()
305 	if (priv->freq_count <= 0 ||  in imx8m_ddrc_init_freq_info()
306 			priv->freq_count > IMX8M_DDRC_MAX_FREQ_COUNT)  in imx8m_ddrc_init_freq_info()
307 		return -ENODEV;  in imx8m_ddrc_init_freq_info()
309 	for (index = 0; index < priv->freq_count; ++index) {  in imx8m_ddrc_init_freq_info()
310 		struct imx8m_ddrc_freq *freq = &priv->freq_table[index];  in imx8m_ddrc_init_freq_info()
316 			return -ENODEV;  in imx8m_ddrc_init_freq_info()
318 		freq->rate = res.a0;  in imx8m_ddrc_init_freq_info()
319 		freq->smcarg = index;  in imx8m_ddrc_init_freq_info()
320 		freq->dram_core_parent_index = res.a1;  in imx8m_ddrc_init_freq_info()
321 		freq->dram_alt_parent_index = res.a2;  in imx8m_ddrc_init_freq_info()
322 		freq->dram_apb_parent_index = res.a3;  in imx8m_ddrc_init_freq_info()
325 		if (freq->dram_core_parent_index != 1 &&  in imx8m_ddrc_init_freq_info()
326 				freq->dram_core_parent_index != 2)  in imx8m_ddrc_init_freq_info()
327 			return -ENODEV;  in imx8m_ddrc_init_freq_info()
329 		if (freq->dram_alt_parent_index > 8 ||  in imx8m_ddrc_init_freq_info()
330 				freq->dram_apb_parent_index > 8)  in imx8m_ddrc_init_freq_info()
331 			return -ENODEV;  in imx8m_ddrc_init_freq_info()
333 		if (freq->dram_core_parent_index == 2 &&  in imx8m_ddrc_init_freq_info()
334 				freq->dram_alt_parent_index == 0)  in imx8m_ddrc_init_freq_info()
335 			return -ENODEV;  in imx8m_ddrc_init_freq_info()
380 	struct device *dev = &pdev->dev;  in imx8m_ddrc_probe()
387 		return -ENOMEM;  in imx8m_ddrc_probe()
397 	priv->dram_core = devm_clk_get(dev, "core");  in imx8m_ddrc_probe()
398 	if (IS_ERR(priv->dram_core)) {  in imx8m_ddrc_probe()
399 		ret = PTR_ERR(priv->dram_core);  in imx8m_ddrc_probe()
400 		dev_err(dev, "failed to fetch core clock: %d\n", ret);  in imx8m_ddrc_probe()
403 	priv->dram_pll = devm_clk_get(dev, "pll");  in imx8m_ddrc_probe()
404 	if (IS_ERR(priv->dram_pll)) {  in imx8m_ddrc_probe()
405 		ret = PTR_ERR(priv->dram_pll);  in imx8m_ddrc_probe()
406 		dev_err(dev, "failed to fetch pll clock: %d\n", ret);  in imx8m_ddrc_probe()
409 	priv->dram_alt = devm_clk_get(dev, "alt");  in imx8m_ddrc_probe()
410 	if (IS_ERR(priv->dram_alt)) {  in imx8m_ddrc_probe()
411 		ret = PTR_ERR(priv->dram_alt);  in imx8m_ddrc_probe()
412 		dev_err(dev, "failed to fetch alt clock: %d\n", ret);  in imx8m_ddrc_probe()
415 	priv->dram_apb = devm_clk_get(dev, "apb");  in imx8m_ddrc_probe()
416 	if (IS_ERR(priv->dram_apb)) {  in imx8m_ddrc_probe()
417 		ret = PTR_ERR(priv->dram_apb);  in imx8m_ddrc_probe()
418 		dev_err(dev, "failed to fetch apb clock: %d\n", ret);  in imx8m_ddrc_probe()
432 	priv->profile.polling_ms = 1000;  in imx8m_ddrc_probe()
433 	priv->profile.target = imx8m_ddrc_target;  in imx8m_ddrc_probe()
434 	priv->profile.get_dev_status = imx8m_ddrc_get_dev_status;  in imx8m_ddrc_probe()
435 	priv->profile.exit = imx8m_ddrc_exit;  in imx8m_ddrc_probe()
436 	priv->profile.get_cur_freq = imx8m_ddrc_get_cur_freq;  in imx8m_ddrc_probe()
437 	priv->profile.initial_freq = clk_get_rate(priv->dram_core);  in imx8m_ddrc_probe()
439 	priv->devfreq = devm_devfreq_add_device(dev, &priv->profile,  in imx8m_ddrc_probe()
441 	if (IS_ERR(priv->devfreq)) {  in imx8m_ddrc_probe()
442 		ret = PTR_ERR(priv->devfreq);  in imx8m_ddrc_probe()
455 	{ .compatible = "fsl,imx8m-ddrc", },
463 		.name	= "imx8m-ddrc-devfreq",