1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. 2 * 3 * Description: CoreSight Trace Port Interface Unit driver 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 and 7 * only version 2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/device.h> 18 #include <linux/io.h> 19 #include <linux/err.h> 20 #include <linux/slab.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/coresight.h> 23 #include <linux/amba/bus.h> 24 #include <linux/clk.h> 25 26 #include "coresight-priv.h" 27 28 #define TPIU_SUPP_PORTSZ 0x000 29 #define TPIU_CURR_PORTSZ 0x004 30 #define TPIU_SUPP_TRIGMODES 0x100 31 #define TPIU_TRIG_CNTRVAL 0x104 32 #define TPIU_TRIG_MULT 0x108 33 #define TPIU_SUPP_TESTPATM 0x200 34 #define TPIU_CURR_TESTPATM 0x204 35 #define TPIU_TEST_PATREPCNTR 0x208 36 #define TPIU_FFSR 0x300 37 #define TPIU_FFCR 0x304 38 #define TPIU_FSYNC_CNTR 0x308 39 #define TPIU_EXTCTL_INPORT 0x400 40 #define TPIU_EXTCTL_OUTPORT 0x404 41 #define TPIU_ITTRFLINACK 0xee4 42 #define TPIU_ITTRFLIN 0xee8 43 #define TPIU_ITATBDATA0 0xeec 44 #define TPIU_ITATBCTR2 0xef0 45 #define TPIU_ITATBCTR1 0xef4 46 #define TPIU_ITATBCTR0 0xef8 47 48 /** register definition **/ 49 /* FFSR - 0x300 */ 50 #define FFSR_FT_STOPPED BIT(1) 51 /* FFCR - 0x304 */ 52 #define FFCR_FON_MAN BIT(6) 53 #define FFCR_STOP_FI BIT(12) 54 55 /** 56 * @base: memory mapped base address for this component. 57 * @dev: the device entity associated to this component. 58 * @atclk: optional clock for the core parts of the TPIU. 59 * @csdev: component vitals needed by the framework. 60 */ 61 struct tpiu_drvdata { 62 void __iomem *base; 63 struct device *dev; 64 struct clk *atclk; 65 struct coresight_device *csdev; 66 }; 67 68 static void tpiu_enable_hw(struct tpiu_drvdata *drvdata) 69 { 70 CS_UNLOCK(drvdata->base); 71 72 /* TODO: fill this up */ 73 74 CS_LOCK(drvdata->base); 75 } 76 77 static int tpiu_enable(struct coresight_device *csdev, u32 mode) 78 { 79 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 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 and stop on flush */ 92 writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR); 93 /* Generate manual flush */ 94 writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR); 95 /* Wait for flush to complete */ 96 coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN, 0); 97 /* Wait for formatter to stop */ 98 coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED, 1); 99 100 CS_LOCK(drvdata->base); 101 } 102 103 static void tpiu_disable(struct coresight_device *csdev) 104 { 105 struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 106 107 tpiu_disable_hw(drvdata); 108 109 dev_info(drvdata->dev, "TPIU disabled\n"); 110 } 111 112 static const struct coresight_ops_sink tpiu_sink_ops = { 113 .enable = tpiu_enable, 114 .disable = tpiu_disable, 115 }; 116 117 static const struct coresight_ops tpiu_cs_ops = { 118 .sink_ops = &tpiu_sink_ops, 119 }; 120 121 static int tpiu_probe(struct amba_device *adev, const struct amba_id *id) 122 { 123 int ret; 124 void __iomem *base; 125 struct device *dev = &adev->dev; 126 struct coresight_platform_data *pdata = NULL; 127 struct tpiu_drvdata *drvdata; 128 struct resource *res = &adev->res; 129 struct coresight_desc desc = { 0 }; 130 struct device_node *np = adev->dev.of_node; 131 132 if (np) { 133 pdata = of_get_coresight_platform_data(dev, np); 134 if (IS_ERR(pdata)) 135 return PTR_ERR(pdata); 136 adev->dev.platform_data = pdata; 137 } 138 139 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 140 if (!drvdata) 141 return -ENOMEM; 142 143 drvdata->dev = &adev->dev; 144 drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */ 145 if (!IS_ERR(drvdata->atclk)) { 146 ret = clk_prepare_enable(drvdata->atclk); 147 if (ret) 148 return ret; 149 } 150 dev_set_drvdata(dev, drvdata); 151 152 /* Validity for the resource is already checked by the AMBA core */ 153 base = devm_ioremap_resource(dev, res); 154 if (IS_ERR(base)) 155 return PTR_ERR(base); 156 157 drvdata->base = base; 158 159 /* Disable tpiu to support older devices */ 160 tpiu_disable_hw(drvdata); 161 162 pm_runtime_put(&adev->dev); 163 164 desc.type = CORESIGHT_DEV_TYPE_SINK; 165 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT; 166 desc.ops = &tpiu_cs_ops; 167 desc.pdata = pdata; 168 desc.dev = dev; 169 drvdata->csdev = coresight_register(&desc); 170 171 return PTR_ERR_OR_ZERO(drvdata->csdev); 172 } 173 174 #ifdef CONFIG_PM 175 static int tpiu_runtime_suspend(struct device *dev) 176 { 177 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev); 178 179 if (drvdata && !IS_ERR(drvdata->atclk)) 180 clk_disable_unprepare(drvdata->atclk); 181 182 return 0; 183 } 184 185 static int tpiu_runtime_resume(struct device *dev) 186 { 187 struct tpiu_drvdata *drvdata = dev_get_drvdata(dev); 188 189 if (drvdata && !IS_ERR(drvdata->atclk)) 190 clk_prepare_enable(drvdata->atclk); 191 192 return 0; 193 } 194 #endif 195 196 static const struct dev_pm_ops tpiu_dev_pm_ops = { 197 SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL) 198 }; 199 200 static const struct amba_id tpiu_ids[] = { 201 { 202 .id = 0x000bb912, 203 .mask = 0x000fffff, 204 }, 205 { 206 .id = 0x0004b912, 207 .mask = 0x0007ffff, 208 }, 209 { 210 /* Coresight SoC-600 */ 211 .id = 0x000bb9e7, 212 .mask = 0x000fffff, 213 }, 214 { 0, 0}, 215 }; 216 217 static struct amba_driver tpiu_driver = { 218 .drv = { 219 .name = "coresight-tpiu", 220 .owner = THIS_MODULE, 221 .pm = &tpiu_dev_pm_ops, 222 .suppress_bind_attrs = true, 223 }, 224 .probe = tpiu_probe, 225 .id_table = tpiu_ids, 226 }; 227 builtin_amba_driver(tpiu_driver); 228