projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b07079f1 VR |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // | |
| 3 | // Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ | |
| 4 | // Author: Vignesh Raghavendra <vigneshr@ti.com> | |
| 5 | ||
| 6 | #include <linux/err.h> | |
| 7 | #include <linux/kernel.h> | |
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/mtd/cfi.h> | |
| 10 | #include <linux/mtd/hyperbus.h> | |
| 11 | #include <linux/mtd/mtd.h> | |
| 12 | #include <linux/mux/consumer.h> | |
| 13 | #include <linux/of.h> | |
| b6fe8bc6 | 14 | #include <linux/of_address.h> |
| b07079f1 VR |
15 | #include <linux/platform_device.h> |
| 16 | #include <linux/pm_runtime.h> | |
| 17 | #include <linux/types.h> | |
| 18 | ||
| 19 | #define AM654_HBMC_CALIB_COUNT 25 | |
| 20 | ||
| 21 | struct am654_hbmc_priv { | |
| 22 | struct hyperbus_ctlr ctlr; | |
| 23 | struct hyperbus_device hbdev; | |
| 24 | struct mux_control *mux_ctrl; | |
| 25 | }; | |
| 26 | ||
| 27 | static int am654_hbmc_calibrate(struct hyperbus_device *hbdev) | |
| 28 | { | |
| 29 | struct map_info *map = &hbdev->map; | |
| 30 | struct cfi_private cfi; | |
| 31 | int count = AM654_HBMC_CALIB_COUNT; | |
| 32 | int pass_count = 0; | |
| 33 | int ret; | |
| 34 | ||
| 35 | cfi.interleave = 1; | |
| 36 | cfi.device_type = CFI_DEVICETYPE_X16; | |
| 37 | cfi_send_gen_cmd(0xF0, 0, 0, map, &cfi, cfi.device_type, NULL); | |
| 38 | cfi_send_gen_cmd(0x98, 0x55, 0, map, &cfi, cfi.device_type, NULL); | |
| 39 | ||
| 40 | while (count--) { | |
| 41 | ret = cfi_qry_present(map, 0, &cfi); | |
| 42 | if (ret) | |
| 43 | pass_count++; | |
| 44 | else | |
| 45 | pass_count = 0; | |
| 46 | if (pass_count == 5) | |
| 47 | break; | |
| 48 | } | |
| 49 | ||
| 50 | cfi_qry_mode_off(0, map, &cfi); | |
| 51 | ||
| 52 | return ret; | |
| 53 | } | |
| 54 | ||
| 55 | static const struct hyperbus_ops am654_hbmc_ops = { | |
| 56 | .calibrate = am654_hbmc_calibrate, | |
| 57 | }; | |
| 58 | ||
| 59 | static int am654_hbmc_probe(struct platform_device *pdev) | |
| 60 | { | |
| b6fe8bc6 | 61 | struct device_node *np = pdev->dev.of_node; |
| b07079f1 VR |
62 | struct device *dev = &pdev->dev; |
| 63 | struct am654_hbmc_priv *priv; | |
| b6fe8bc6 | 64 | struct resource res; |
| b07079f1 VR |
65 | int ret; |
| 66 | ||
| 67 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
| 68 | if (!priv) | |
| 69 | return -ENOMEM; | |
| 70 | ||
| 71 | platform_set_drvdata(pdev, priv); | |
| 72 | ||
| b6fe8bc6 SS |
73 | ret = of_address_to_resource(np, 0, &res); |
| 74 | if (ret) | |
| 75 | return ret; | |
| 76 | ||
| b07079f1 VR |
77 | if (of_property_read_bool(dev->of_node, "mux-controls")) { |
| 78 | struct mux_control *control = devm_mux_control_get(dev, NULL); | |
| 79 | ||
| 80 | if (IS_ERR(control)) | |
| 81 | return PTR_ERR(control); | |
| 82 | ||
| 83 | ret = mux_control_select(control, 1); | |
| 84 | if (ret) { | |
| 85 | dev_err(dev, "Failed to select HBMC mux\n"); | |
| 86 | return ret; | |
| 87 | } | |
| 88 | priv->mux_ctrl = control; | |
| 89 | } | |
| 90 | ||
| 91 | pm_runtime_enable(dev); | |
| 92 | ret = pm_runtime_get_sync(dev); | |
| 93 | if (ret < 0) { | |
| 94 | pm_runtime_put_noidle(dev); | |
| 95 | goto disable_pm; | |
| 96 | } | |
| 97 | ||
| b6fe8bc6 SS |
98 | priv->hbdev.map.size = resource_size(&res); |
| 99 | priv->hbdev.map.virt = devm_ioremap_resource(dev, &res); | |
| 100 | if (IS_ERR(priv->hbdev.map.virt)) | |
| 101 | return PTR_ERR(priv->hbdev.map.virt); | |
| 102 | ||
| b07079f1 VR |
103 | priv->ctlr.dev = dev; |
| 104 | priv->ctlr.ops = &am654_hbmc_ops; | |
| 105 | priv->hbdev.ctlr = &priv->ctlr; | |
| 106 | priv->hbdev.np = of_get_next_child(dev->of_node, NULL); | |
| 107 | ret = hyperbus_register_device(&priv->hbdev); | |
| 108 | if (ret) { | |
| 109 | dev_err(dev, "failed to register controller\n"); | |
| 110 | pm_runtime_put_sync(&pdev->dev); | |
| 111 | goto disable_pm; | |
| 112 | } | |
| 113 | ||
| 114 | return 0; | |
| 115 | disable_pm: | |
| 116 | pm_runtime_disable(dev); | |
| 117 | if (priv->mux_ctrl) | |
| 118 | mux_control_deselect(priv->mux_ctrl); | |
| 119 | return ret; | |
| 120 | } | |
| 121 | ||
| 122 | static int am654_hbmc_remove(struct platform_device *pdev) | |
| 123 | { | |
| 124 | struct am654_hbmc_priv *priv = platform_get_drvdata(pdev); | |
| 125 | int ret; | |
| 126 | ||
| 127 | ret = hyperbus_unregister_device(&priv->hbdev); | |
| 128 | if (priv->mux_ctrl) | |
| 129 | mux_control_deselect(priv->mux_ctrl); | |
| 130 | pm_runtime_put_sync(&pdev->dev); | |
| 131 | pm_runtime_disable(&pdev->dev); | |
| 132 | ||
| 133 | return ret; | |
| 134 | } | |
| 135 | ||
| 136 | static const struct of_device_id am654_hbmc_dt_ids[] = { | |
| 137 | { | |
| 138 | .compatible = "ti,am654-hbmc", | |
| 139 | }, | |
| 140 | { /* end of table */ } | |
| 141 | }; | |
| 142 | ||
| 143 | MODULE_DEVICE_TABLE(of, am654_hbmc_dt_ids); | |
| 144 | ||
| 145 | static struct platform_driver am654_hbmc_platform_driver = { | |
| 146 | .probe = am654_hbmc_probe, | |
| 147 | .remove = am654_hbmc_remove, | |
| 148 | .driver = { | |
| 149 | .name = "hbmc-am654", | |
| 150 | .of_match_table = am654_hbmc_dt_ids, | |
| 151 | }, | |
| 152 | }; | |
| 153 | ||
| 154 | module_platform_driver(am654_hbmc_platform_driver); | |
| 155 | ||
| 156 | MODULE_DESCRIPTION("HBMC driver for AM654 SoC"); | |
| 157 | MODULE_LICENSE("GPL v2"); | |
| 158 | MODULE_ALIAS("platform:hbmc-am654"); | |
| 159 | MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>"); |