1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020 MediaTek Inc. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/interrupt.h> 8 #include <linux/iopoll.h> 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/of.h> 12 #include <linux/of_irq.h> 13 #include <linux/of_address.h> 14 15 #define VIO_MOD_TO_REG_IND(m) ((m) / 32) 16 #define VIO_MOD_TO_REG_OFF(m) ((m) % 32) 17 18 struct mtk_devapc_vio_dbgs { 19 union { 20 u32 vio_dbg0; 21 struct { 22 u32 mstid:16; 23 u32 dmnid:6; 24 u32 vio_w:1; 25 u32 vio_r:1; 26 u32 addr_h:4; 27 u32 resv:4; 28 } dbg0_bits; 29 }; 30 31 u32 vio_dbg1; 32 }; 33 34 struct mtk_devapc_regs_ofs { 35 /* reg offset */ 36 u32 vio_mask_offset; 37 u32 vio_sta_offset; 38 u32 vio_dbg0_offset; 39 u32 vio_dbg1_offset; 40 u32 apc_con_offset; 41 u32 vio_shift_sta_offset; 42 u32 vio_shift_sel_offset; 43 u32 vio_shift_con_offset; 44 }; 45 46 struct mtk_devapc_data { 47 /* numbers of violation index */ 48 u32 vio_idx_num; 49 const struct mtk_devapc_regs_ofs *regs_ofs; 50 }; 51 52 struct mtk_devapc_context { 53 struct device *dev; 54 void __iomem *infra_base; 55 struct clk *infra_clk; 56 const struct mtk_devapc_data *data; 57 }; 58 59 static void clear_vio_status(struct mtk_devapc_context *ctx) 60 { 61 void __iomem *reg; 62 int i; 63 64 reg = ctx->infra_base + ctx->data->regs_ofs->vio_sta_offset; 65 66 for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++) 67 writel(GENMASK(31, 0), reg + 4 * i); 68 69 writel(GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1, 0), 70 reg + 4 * i); 71 } 72 73 static void mask_module_irq(struct mtk_devapc_context *ctx, bool mask) 74 { 75 void __iomem *reg; 76 u32 val; 77 int i; 78 79 reg = ctx->infra_base + ctx->data->regs_ofs->vio_mask_offset; 80 81 if (mask) 82 val = GENMASK(31, 0); 83 else 84 val = 0; 85 86 for (i = 0; i < VIO_MOD_TO_REG_IND(ctx->data->vio_idx_num) - 1; i++) 87 writel(val, reg + 4 * i); 88 89 val = readl(reg + 4 * i); 90 if (mask) 91 val |= GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1, 92 0); 93 else 94 val &= ~GENMASK(VIO_MOD_TO_REG_OFF(ctx->data->vio_idx_num) - 1, 95 0); 96 97 writel(val, reg + 4 * i); 98 } 99 100 #define PHY_DEVAPC_TIMEOUT 0x10000 101 102 /* 103 * devapc_sync_vio_dbg - do "shift" mechansim" to get full violation information. 104 * shift mechanism is depends on devapc hardware design. 105 * Mediatek devapc set multiple slaves as a group. 106 * When violation is triggered, violation info is kept 107 * inside devapc hardware. 108 * Driver should do shift mechansim to sync full violation 109 * info to VIO_DBGs registers. 110 * 111 */ 112 static int devapc_sync_vio_dbg(struct mtk_devapc_context *ctx) 113 { 114 void __iomem *pd_vio_shift_sta_reg; 115 void __iomem *pd_vio_shift_sel_reg; 116 void __iomem *pd_vio_shift_con_reg; 117 int min_shift_group; 118 int ret; 119 u32 val; 120 121 pd_vio_shift_sta_reg = ctx->infra_base + 122 ctx->data->regs_ofs->vio_shift_sta_offset; 123 pd_vio_shift_sel_reg = ctx->infra_base + 124 ctx->data->regs_ofs->vio_shift_sel_offset; 125 pd_vio_shift_con_reg = ctx->infra_base + 126 ctx->data->regs_ofs->vio_shift_con_offset; 127 128 /* Find the minimum shift group which has violation */ 129 val = readl(pd_vio_shift_sta_reg); 130 if (!val) 131 return false; 132 133 min_shift_group = __ffs(val); 134 135 /* Assign the group to sync */ 136 writel(0x1 << min_shift_group, pd_vio_shift_sel_reg); 137 138 /* Start syncing */ 139 writel(0x1, pd_vio_shift_con_reg); 140 141 ret = readl_poll_timeout(pd_vio_shift_con_reg, val, val == 0x3, 0, 142 PHY_DEVAPC_TIMEOUT); 143 if (ret) { 144 dev_err(ctx->dev, "%s: Shift violation info failed\n", __func__); 145 return false; 146 } 147 148 /* Stop syncing */ 149 writel(0x0, pd_vio_shift_con_reg); 150 151 /* Write clear */ 152 writel(0x1 << min_shift_group, pd_vio_shift_sta_reg); 153 154 return true; 155 } 156 157 /* 158 * devapc_extract_vio_dbg - extract full violation information after doing 159 * shift mechanism. 160 */ 161 static void devapc_extract_vio_dbg(struct mtk_devapc_context *ctx) 162 { 163 struct mtk_devapc_vio_dbgs vio_dbgs; 164 void __iomem *vio_dbg0_reg; 165 void __iomem *vio_dbg1_reg; 166 167 vio_dbg0_reg = ctx->infra_base + ctx->data->regs_ofs->vio_dbg0_offset; 168 vio_dbg1_reg = ctx->infra_base + ctx->data->regs_ofs->vio_dbg1_offset; 169 170 vio_dbgs.vio_dbg0 = readl(vio_dbg0_reg); 171 vio_dbgs.vio_dbg1 = readl(vio_dbg1_reg); 172 173 /* Print violation information */ 174 if (vio_dbgs.dbg0_bits.vio_w) 175 dev_info(ctx->dev, "Write Violation\n"); 176 else if (vio_dbgs.dbg0_bits.vio_r) 177 dev_info(ctx->dev, "Read Violation\n"); 178 179 dev_info(ctx->dev, "Bus ID:0x%x, Dom ID:0x%x, Vio Addr:0x%x\n", 180 vio_dbgs.dbg0_bits.mstid, vio_dbgs.dbg0_bits.dmnid, 181 vio_dbgs.vio_dbg1); 182 } 183 184 /* 185 * devapc_violation_irq - the devapc Interrupt Service Routine (ISR) will dump 186 * violation information including which master violates 187 * access slave. 188 */ 189 static irqreturn_t devapc_violation_irq(int irq_number, void *data) 190 { 191 struct mtk_devapc_context *ctx = data; 192 193 while (devapc_sync_vio_dbg(ctx)) 194 devapc_extract_vio_dbg(ctx); 195 196 clear_vio_status(ctx); 197 198 return IRQ_HANDLED; 199 } 200 201 /* 202 * start_devapc - unmask slave's irq to start receiving devapc violation. 203 */ 204 static void start_devapc(struct mtk_devapc_context *ctx) 205 { 206 writel(BIT(31), ctx->infra_base + ctx->data->regs_ofs->apc_con_offset); 207 208 mask_module_irq(ctx, false); 209 } 210 211 /* 212 * stop_devapc - mask slave's irq to stop service. 213 */ 214 static void stop_devapc(struct mtk_devapc_context *ctx) 215 { 216 mask_module_irq(ctx, true); 217 218 writel(BIT(2), ctx->infra_base + ctx->data->regs_ofs->apc_con_offset); 219 } 220 221 static const struct mtk_devapc_regs_ofs devapc_regs_ofs_mt6779 = { 222 .vio_mask_offset = 0x0, 223 .vio_sta_offset = 0x400, 224 .vio_dbg0_offset = 0x900, 225 .vio_dbg1_offset = 0x904, 226 .apc_con_offset = 0xF00, 227 .vio_shift_sta_offset = 0xF10, 228 .vio_shift_sel_offset = 0xF14, 229 .vio_shift_con_offset = 0xF20, 230 }; 231 232 static const struct mtk_devapc_data devapc_mt6779 = { 233 .vio_idx_num = 511, 234 .regs_ofs = &devapc_regs_ofs_mt6779, 235 }; 236 237 static const struct mtk_devapc_data devapc_mt8186 = { 238 .vio_idx_num = 519, 239 .regs_ofs = &devapc_regs_ofs_mt6779, 240 }; 241 242 static const struct of_device_id mtk_devapc_dt_match[] = { 243 { 244 .compatible = "mediatek,mt6779-devapc", 245 .data = &devapc_mt6779, 246 }, { 247 .compatible = "mediatek,mt8186-devapc", 248 .data = &devapc_mt8186, 249 }, { 250 }, 251 }; 252 MODULE_DEVICE_TABLE(of, mtk_devapc_dt_match); 253 254 static int mtk_devapc_probe(struct platform_device *pdev) 255 { 256 struct device_node *node = pdev->dev.of_node; 257 struct mtk_devapc_context *ctx; 258 u32 devapc_irq; 259 int ret; 260 261 if (IS_ERR(node)) 262 return -ENODEV; 263 264 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL); 265 if (!ctx) 266 return -ENOMEM; 267 268 ctx->data = of_device_get_match_data(&pdev->dev); 269 ctx->dev = &pdev->dev; 270 271 ctx->infra_base = of_iomap(node, 0); 272 if (!ctx->infra_base) 273 return -EINVAL; 274 275 devapc_irq = irq_of_parse_and_map(node, 0); 276 if (!devapc_irq) 277 return -EINVAL; 278 279 ctx->infra_clk = devm_clk_get_enabled(&pdev->dev, "devapc-infra-clock"); 280 if (IS_ERR(ctx->infra_clk)) 281 return -EINVAL; 282 283 ret = devm_request_irq(&pdev->dev, devapc_irq, devapc_violation_irq, 284 IRQF_TRIGGER_NONE, "devapc", ctx); 285 if (ret) 286 return ret; 287 288 platform_set_drvdata(pdev, ctx); 289 290 start_devapc(ctx); 291 292 return 0; 293 } 294 295 static void mtk_devapc_remove(struct platform_device *pdev) 296 { 297 struct mtk_devapc_context *ctx = platform_get_drvdata(pdev); 298 299 stop_devapc(ctx); 300 } 301 302 static struct platform_driver mtk_devapc_driver = { 303 .probe = mtk_devapc_probe, 304 .remove = mtk_devapc_remove, 305 .driver = { 306 .name = "mtk-devapc", 307 .of_match_table = mtk_devapc_dt_match, 308 }, 309 }; 310 311 module_platform_driver(mtk_devapc_driver); 312 313 MODULE_DESCRIPTION("Mediatek Device APC Driver"); 314 MODULE_AUTHOR("Neal Liu <neal.liu@mediatek.com>"); 315 MODULE_LICENSE("GPL"); 316