^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2019 NXP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/devfreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/pm_opp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct imx_bus {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct devfreq_dev_profile profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct devfreq *devfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct platform_device *icc_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static int imx_bus_target(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) unsigned long *freq, u32 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct dev_pm_opp *new_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) new_opp = devfreq_recommended_opp(dev, freq, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) if (IS_ERR(new_opp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) ret = PTR_ERR(new_opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) dev_err(dev, "failed to get recommended opp: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) dev_pm_opp_put(new_opp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return dev_pm_opp_set_rate(dev, *freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int imx_bus_get_cur_freq(struct device *dev, unsigned long *freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct imx_bus *priv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) *freq = clk_get_rate(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static int imx_bus_get_dev_status(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct devfreq_dev_status *stat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct imx_bus *priv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) stat->busy_time = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) stat->total_time = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) stat->current_frequency = clk_get_rate(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static void imx_bus_exit(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct imx_bus *priv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) platform_device_unregister(priv->icc_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* imx_bus_init_icc() - register matching icc provider if required */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int imx_bus_init_icc(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct imx_bus *priv = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) const char *icc_driver_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!of_get_property(dev->of_node, "#interconnect-cells", 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (!IS_ENABLED(CONFIG_INTERCONNECT_IMX)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) dev_warn(dev, "imx interconnect drivers disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) icc_driver_name = of_device_get_match_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (!icc_driver_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) dev_err(dev, "unknown interconnect driver\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) priv->icc_pdev = platform_device_register_data(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) dev, icc_driver_name, -1, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (IS_ERR(priv->icc_pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) dev_err(dev, "failed to register icc provider %s: %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) icc_driver_name, PTR_ERR(priv->icc_pdev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return PTR_ERR(priv->icc_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static int imx_bus_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct imx_bus *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) const char *gov = DEVFREQ_GOV_USERSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * Fetch the clock to adjust but don't explicitly enable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * For imx bus clock clk_set_rate is safe no matter if the clock is on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * or off and some peripheral side-buses might be off unless enabled by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * drivers for devices on those specific buses.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * Rate adjustment on a disabled bus clock just takes effect later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) priv->clk = devm_clk_get(dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (IS_ERR(priv->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ret = PTR_ERR(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) dev_err(dev, "failed to fetch clk: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) platform_set_drvdata(pdev, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ret = dev_pm_opp_of_add_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) dev_err(dev, "failed to get OPP table\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) priv->profile.polling_ms = 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) priv->profile.target = imx_bus_target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) priv->profile.get_dev_status = imx_bus_get_dev_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) priv->profile.exit = imx_bus_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) priv->profile.get_cur_freq = imx_bus_get_cur_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) priv->profile.initial_freq = clk_get_rate(priv->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) priv->devfreq = devm_devfreq_add_device(dev, &priv->profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) gov, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (IS_ERR(priv->devfreq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = PTR_ERR(priv->devfreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) dev_err(dev, "failed to add devfreq device: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) ret = imx_bus_init_icc(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) dev_pm_opp_of_remove_table(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static const struct of_device_id imx_bus_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) { .compatible = "fsl,imx8mq-noc", .data = "imx8mq-interconnect", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) { .compatible = "fsl,imx8mm-noc", .data = "imx8mm-interconnect", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) { .compatible = "fsl,imx8mn-noc", .data = "imx8mn-interconnect", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) { .compatible = "fsl,imx8m-noc", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) { .compatible = "fsl,imx8m-nic", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) { /* sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) MODULE_DEVICE_TABLE(of, imx_bus_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static struct platform_driver imx_bus_platdrv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) .probe = imx_bus_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) .name = "imx-bus-devfreq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) .of_match_table = of_match_ptr(imx_bus_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) module_platform_driver(imx_bus_platdrv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) MODULE_DESCRIPTION("Generic i.MX bus frequency scaling driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags