Pratik Patel | dc161b9 | 2014-11-03 11:07:37 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/err.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/clk.h> |
| 21 | #include <linux/coresight.h> |
| 22 | #include <linux/amba/bus.h> |
| 23 | |
| 24 | #include "coresight-priv.h" |
| 25 | |
| 26 | #define TPIU_SUPP_PORTSZ 0x000 |
| 27 | #define TPIU_CURR_PORTSZ 0x004 |
| 28 | #define TPIU_SUPP_TRIGMODES 0x100 |
| 29 | #define TPIU_TRIG_CNTRVAL 0x104 |
| 30 | #define TPIU_TRIG_MULT 0x108 |
| 31 | #define TPIU_SUPP_TESTPATM 0x200 |
| 32 | #define TPIU_CURR_TESTPATM 0x204 |
| 33 | #define TPIU_TEST_PATREPCNTR 0x208 |
| 34 | #define TPIU_FFSR 0x300 |
| 35 | #define TPIU_FFCR 0x304 |
| 36 | #define TPIU_FSYNC_CNTR 0x308 |
| 37 | #define TPIU_EXTCTL_INPORT 0x400 |
| 38 | #define TPIU_EXTCTL_OUTPORT 0x404 |
| 39 | #define TPIU_ITTRFLINACK 0xee4 |
| 40 | #define TPIU_ITTRFLIN 0xee8 |
| 41 | #define TPIU_ITATBDATA0 0xeec |
| 42 | #define TPIU_ITATBCTR2 0xef0 |
| 43 | #define TPIU_ITATBCTR1 0xef4 |
| 44 | #define TPIU_ITATBCTR0 0xef8 |
| 45 | |
| 46 | /** register definition **/ |
| 47 | /* FFCR - 0x304 */ |
| 48 | #define FFCR_FON_MAN BIT(6) |
| 49 | |
| 50 | /** |
| 51 | * @base: memory mapped base address for this component. |
| 52 | * @dev: the device entity associated to this component. |
| 53 | * @csdev: component vitals needed by the framework. |
| 54 | * @clk: the clock this component is associated to. |
| 55 | */ |
| 56 | struct tpiu_drvdata { |
| 57 | void __iomem *base; |
| 58 | struct device *dev; |
| 59 | struct coresight_device *csdev; |
| 60 | struct clk *clk; |
| 61 | }; |
| 62 | |
| 63 | static void tpiu_enable_hw(struct tpiu_drvdata *drvdata) |
| 64 | { |
| 65 | CS_UNLOCK(drvdata->base); |
| 66 | |
| 67 | /* TODO: fill this up */ |
| 68 | |
| 69 | CS_LOCK(drvdata->base); |
| 70 | } |
| 71 | |
| 72 | static int tpiu_enable(struct coresight_device *csdev) |
| 73 | { |
| 74 | struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 75 | int ret; |
| 76 | |
| 77 | ret = clk_prepare_enable(drvdata->clk); |
| 78 | if (ret) |
| 79 | return ret; |
| 80 | |
| 81 | tpiu_enable_hw(drvdata); |
| 82 | |
| 83 | dev_info(drvdata->dev, "TPIU enabled\n"); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | static void tpiu_disable_hw(struct tpiu_drvdata *drvdata) |
| 88 | { |
| 89 | CS_UNLOCK(drvdata->base); |
| 90 | |
| 91 | /* Clear formatter controle reg. */ |
| 92 | writel_relaxed(0x0, drvdata->base + TPIU_FFCR); |
| 93 | /* Generate manual flush */ |
| 94 | writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR); |
| 95 | |
| 96 | CS_LOCK(drvdata->base); |
| 97 | } |
| 98 | |
| 99 | static void tpiu_disable(struct coresight_device *csdev) |
| 100 | { |
| 101 | struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 102 | |
| 103 | tpiu_disable_hw(drvdata); |
| 104 | |
| 105 | clk_disable_unprepare(drvdata->clk); |
| 106 | |
| 107 | dev_info(drvdata->dev, "TPIU disabled\n"); |
| 108 | } |
| 109 | |
| 110 | static const struct coresight_ops_sink tpiu_sink_ops = { |
| 111 | .enable = tpiu_enable, |
| 112 | .disable = tpiu_disable, |
| 113 | }; |
| 114 | |
| 115 | static const struct coresight_ops tpiu_cs_ops = { |
| 116 | .sink_ops = &tpiu_sink_ops, |
| 117 | }; |
| 118 | |
| 119 | static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) |
| 120 | { |
| 121 | int ret; |
| 122 | void __iomem *base; |
| 123 | struct device *dev = &adev->dev; |
| 124 | struct coresight_platform_data *pdata = NULL; |
| 125 | struct tpiu_drvdata *drvdata; |
| 126 | struct resource *res = &adev->res; |
| 127 | struct coresight_desc *desc; |
| 128 | struct device_node *np = adev->dev.of_node; |
| 129 | |
| 130 | if (np) { |
| 131 | pdata = of_get_coresight_platform_data(dev, np); |
| 132 | if (IS_ERR(pdata)) |
| 133 | return PTR_ERR(pdata); |
| 134 | adev->dev.platform_data = pdata; |
| 135 | } |
| 136 | |
| 137 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| 138 | if (!drvdata) |
| 139 | return -ENOMEM; |
| 140 | |
| 141 | drvdata->dev = &adev->dev; |
| 142 | dev_set_drvdata(dev, drvdata); |
| 143 | |
| 144 | /* Validity for the resource is already checked by the AMBA core */ |
| 145 | base = devm_ioremap_resource(dev, res); |
| 146 | if (IS_ERR(base)) |
| 147 | return PTR_ERR(base); |
| 148 | |
| 149 | drvdata->base = base; |
| 150 | |
| 151 | drvdata->clk = adev->pclk; |
| 152 | ret = clk_prepare_enable(drvdata->clk); |
| 153 | if (ret) |
| 154 | return ret; |
| 155 | |
| 156 | /* Disable tpiu to support older devices */ |
| 157 | tpiu_disable_hw(drvdata); |
| 158 | |
| 159 | clk_disable_unprepare(drvdata->clk); |
| 160 | |
| 161 | desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); |
| 162 | if (!desc) |
| 163 | return -ENOMEM; |
| 164 | |
| 165 | desc->type = CORESIGHT_DEV_TYPE_SINK; |
| 166 | desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT; |
| 167 | desc->ops = &tpiu_cs_ops; |
| 168 | desc->pdata = pdata; |
| 169 | desc->dev = dev; |
| 170 | drvdata->csdev = coresight_register(desc); |
| 171 | if (IS_ERR(drvdata->csdev)) |
| 172 | return PTR_ERR(drvdata->csdev); |
| 173 | |
| 174 | dev_info(dev, "TPIU initialized\n"); |
| 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int tpiu_remove(struct amba_device *adev) |
| 179 | { |
| 180 | struct tpiu_drvdata *drvdata = amba_get_drvdata(adev); |
| 181 | |
| 182 | coresight_unregister(drvdata->csdev); |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | static struct amba_id tpiu_ids[] = { |
| 187 | { |
| 188 | .id = 0x0003b912, |
| 189 | .mask = 0x0003ffff, |
| 190 | }, |
| 191 | { 0, 0}, |
| 192 | }; |
| 193 | |
| 194 | static struct amba_driver tpiu_driver = { |
| 195 | .drv = { |
| 196 | .name = "coresight-tpiu", |
| 197 | .owner = THIS_MODULE, |
| 198 | }, |
| 199 | .probe = tpiu_probe, |
| 200 | .remove = tpiu_remove, |
| 201 | .id_table = tpiu_ids, |
| 202 | }; |
| 203 | |
| 204 | static int __init tpiu_init(void) |
| 205 | { |
| 206 | return amba_driver_register(&tpiu_driver); |
| 207 | } |
| 208 | module_init(tpiu_init); |
| 209 | |
| 210 | static void __exit tpiu_exit(void) |
| 211 | { |
| 212 | amba_driver_unregister(&tpiu_driver); |
| 213 | } |
| 214 | module_exit(tpiu_exit); |
| 215 | |
| 216 | MODULE_LICENSE("GPL v2"); |
| 217 | MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver"); |