1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ARC HSDK Platform support code 4 * 5 * Copyright (C) 2017 Synopsys, Inc. (www.synopsys.com) 6 */ 7 8 #include <linux/init.h> 9 #include <linux/of_fdt.h> 10 #include <linux/libfdt.h> 11 #include <linux/smp.h> 12 #include <asm/arcregs.h> 13 #include <asm/io.h> 14 #include <asm/mach_desc.h> 15 16 int arc_hsdk_axi_dmac_coherent __section(.data) = 0; 17 18 #define ARC_CCM_UNUSED_ADDR 0x60000000 19 20 static void __init hsdk_init_per_cpu(unsigned int cpu) 21 { 22 /* 23 * By default ICCM is mapped to 0x7z while this area is used for 24 * kernel virtual mappings, so move it to currently unused area. 25 */ 26 if (cpuinfo_arc700[cpu].iccm.sz) 27 write_aux_reg(ARC_REG_AUX_ICCM, ARC_CCM_UNUSED_ADDR); 28 29 /* 30 * By default DCCM is mapped to 0x8z while this area is used by kernel, 31 * so move it to currently unused area. 32 */ 33 if (cpuinfo_arc700[cpu].dccm.sz) 34 write_aux_reg(ARC_REG_AUX_DCCM, ARC_CCM_UNUSED_ADDR); 35 } 36 37 #define ARC_PERIPHERAL_BASE 0xf0000000 38 #define CREG_BASE (ARC_PERIPHERAL_BASE + 0x1000) 39 40 #define SDIO_BASE (ARC_PERIPHERAL_BASE + 0xA000) 41 #define SDIO_UHS_REG_EXT (SDIO_BASE + 0x108) 42 #define SDIO_UHS_REG_EXT_DIV_2 (2 << 30) 43 44 #define HSDK_GPIO_INTC (ARC_PERIPHERAL_BASE + 0x3000) 45 46 static void __init hsdk_enable_gpio_intc_wire(void) 47 { 48 /* 49 * Peripherals on CPU Card are wired to cpu intc via intermediate 50 * DW APB GPIO blocks (mainly for debouncing) 51 * 52 * --------------------- 53 * | snps,archs-intc | 54 * --------------------- 55 * | 56 * ---------------------- 57 * | snps,archs-idu-intc | 58 * ---------------------- 59 * | | | | | 60 * | [eth] [USB] [... other peripherals] 61 * | 62 * ------------------- 63 * | snps,dw-apb-intc | 64 * ------------------- 65 * | | | | 66 * [Bt] [HAPS] [... other peripherals] 67 * 68 * Current implementation of "irq-dw-apb-ictl" driver doesn't work well 69 * with stacked INTCs. In particular problem happens if its master INTC 70 * not yet instantiated. See discussion here - 71 * https://lkml.org/lkml/2015/3/4/755 72 * 73 * So setup the first gpio block as a passive pass thru and hide it from 74 * DT hardware topology - connect intc directly to cpu intc 75 * The GPIO "wire" needs to be init nevertheless (here) 76 * 77 * One side adv is that peripheral interrupt handling avoids one nested 78 * intc ISR hop 79 * 80 * According to HSDK User's Manual [1], "Table 2 Interrupt Mapping" 81 * we have the following GPIO input lines used as sources of interrupt: 82 * - GPIO[0] - Bluetooth interrupt of RS9113 module 83 * - GPIO[2] - HAPS interrupt (on HapsTrak 3 connector) 84 * - GPIO[3] - Audio codec (MAX9880A) interrupt 85 * - GPIO[8-23] - Available on Arduino and PMOD_x headers 86 * For now there's no use of Arduino and PMOD_x headers in Linux 87 * use-case so we only enable lines 0, 2 and 3. 88 * 89 * [1] https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf 90 */ 91 #define GPIO_INTEN (HSDK_GPIO_INTC + 0x30) 92 #define GPIO_INTMASK (HSDK_GPIO_INTC + 0x34) 93 #define GPIO_INTTYPE_LEVEL (HSDK_GPIO_INTC + 0x38) 94 #define GPIO_INT_POLARITY (HSDK_GPIO_INTC + 0x3c) 95 #define GPIO_INT_CONNECTED_MASK 0x0d 96 97 iowrite32(0xffffffff, (void __iomem *) GPIO_INTMASK); 98 iowrite32(~GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTMASK); 99 iowrite32(0x00000000, (void __iomem *) GPIO_INTTYPE_LEVEL); 100 iowrite32(0xffffffff, (void __iomem *) GPIO_INT_POLARITY); 101 iowrite32(GPIO_INT_CONNECTED_MASK, (void __iomem *) GPIO_INTEN); 102 } 103 104 static int __init hsdk_tweak_node_coherency(const char *path, bool coherent) 105 { 106 void *fdt = initial_boot_params; 107 const void *prop; 108 int node, ret; 109 bool dt_coh_set; 110 111 node = fdt_path_offset(fdt, path); 112 if (node < 0) 113 goto tweak_fail; 114 115 prop = fdt_getprop(fdt, node, "dma-coherent", &ret); 116 if (!prop && ret != -FDT_ERR_NOTFOUND) 117 goto tweak_fail; 118 119 dt_coh_set = ret != -FDT_ERR_NOTFOUND; 120 ret = 0; 121 122 /* need to remove "dma-coherent" property */ 123 if (dt_coh_set && !coherent) 124 ret = fdt_delprop(fdt, node, "dma-coherent"); 125 126 /* need to set "dma-coherent" property */ 127 if (!dt_coh_set && coherent) 128 ret = fdt_setprop(fdt, node, "dma-coherent", NULL, 0); 129 130 if (ret < 0) 131 goto tweak_fail; 132 133 return 0; 134 135 tweak_fail: 136 pr_err("failed to tweak %s to %scoherent\n", path, coherent ? "" : "non"); 137 return -EFAULT; 138 } 139 140 enum hsdk_axi_masters { 141 M_HS_CORE = 0, 142 M_HS_RTT, 143 M_AXI_TUN, 144 M_HDMI_VIDEO, 145 M_HDMI_AUDIO, 146 M_USB_HOST, 147 M_ETHERNET, 148 M_SDIO, 149 M_GPU, 150 M_DMAC_0, 151 M_DMAC_1, 152 M_DVFS 153 }; 154 155 #define UPDATE_VAL 1 156 157 /* 158 * This is modified configuration of AXI bridge. Default settings 159 * are specified in "Table 111 CREG Address Decoder register reset values". 160 * 161 * AXI_M_m_SLV{0|1} - Slave Select register for master 'm'. 162 * Possible slaves are: 163 * - 0 => no slave selected 164 * - 1 => DDR controller port #1 165 * - 2 => SRAM controller 166 * - 3 => AXI tunnel 167 * - 4 => EBI controller 168 * - 5 => ROM controller 169 * - 6 => AXI2APB bridge 170 * - 7 => DDR controller port #2 171 * - 8 => DDR controller port #3 172 * - 9 => HS38x4 IOC 173 * - 10 => HS38x4 DMI 174 * AXI_M_m_OFFSET{0|1} - Addr Offset register for master 'm' 175 * 176 * Please read ARC HS Development IC Specification, section 17.2 for more 177 * information about apertures configuration. 178 * 179 * m master AXI_M_m_SLV0 AXI_M_m_SLV1 AXI_M_m_OFFSET0 AXI_M_m_OFFSET1 180 * 0 HS (CBU) 0x11111111 0x63111111 0xFEDCBA98 0x0E543210 181 * 1 HS (RTT) 0x77777777 0x77777777 0xFEDCBA98 0x76543210 182 * 2 AXI Tunnel 0x88888888 0x88888888 0xFEDCBA98 0x76543210 183 * 3 HDMI-VIDEO 0x77777777 0x77777777 0xFEDCBA98 0x76543210 184 * 4 HDMI-ADUIO 0x77777777 0x77777777 0xFEDCBA98 0x76543210 185 * 5 USB-HOST 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98 186 * 6 ETHERNET 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98 187 * 7 SDIO 0x77777777 0x77999999 0xFEDCBA98 0x76DCBA98 188 * 8 GPU 0x77777777 0x77777777 0xFEDCBA98 0x76543210 189 * 9 DMAC (port #1) 0x77777777 0x77777777 0xFEDCBA98 0x76543210 190 * 10 DMAC (port #2) 0x77777777 0x77777777 0xFEDCBA98 0x76543210 191 * 11 DVFS 0x00000000 0x60000000 0x00000000 0x00000000 192 */ 193 194 #define CREG_AXI_M_SLV0(m) ((void __iomem *)(CREG_BASE + 0x20 * (m))) 195 #define CREG_AXI_M_SLV1(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x04)) 196 #define CREG_AXI_M_OFT0(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x08)) 197 #define CREG_AXI_M_OFT1(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x0C)) 198 #define CREG_AXI_M_UPDT(m) ((void __iomem *)(CREG_BASE + 0x20 * (m) + 0x14)) 199 200 #define CREG_AXI_M_HS_CORE_BOOT ((void __iomem *)(CREG_BASE + 0x010)) 201 202 #define CREG_PAE ((void __iomem *)(CREG_BASE + 0x180)) 203 #define CREG_PAE_UPDT ((void __iomem *)(CREG_BASE + 0x194)) 204 205 static void __init hsdk_init_memory_bridge_axi_dmac(void) 206 { 207 bool coherent = !!arc_hsdk_axi_dmac_coherent; 208 u32 axi_m_slv1, axi_m_oft1; 209 210 /* 211 * Don't tweak memory bridge configuration if we failed to tweak DTB 212 * as we will end up in a inconsistent state. 213 */ 214 if (hsdk_tweak_node_coherency("/soc/dmac@80000", coherent)) 215 return; 216 217 if (coherent) { 218 axi_m_slv1 = 0x77999999; 219 axi_m_oft1 = 0x76DCBA98; 220 } else { 221 axi_m_slv1 = 0x77777777; 222 axi_m_oft1 = 0x76543210; 223 } 224 225 writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_0)); 226 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_0)); 227 writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_0)); 228 writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_0)); 229 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_0)); 230 231 writel(0x77777777, CREG_AXI_M_SLV0(M_DMAC_1)); 232 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_DMAC_1)); 233 writel(axi_m_slv1, CREG_AXI_M_SLV1(M_DMAC_1)); 234 writel(axi_m_oft1, CREG_AXI_M_OFT1(M_DMAC_1)); 235 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DMAC_1)); 236 } 237 238 static void __init hsdk_init_memory_bridge(void) 239 { 240 u32 reg; 241 242 /* 243 * M_HS_CORE has one unique register - BOOT. 244 * We need to clean boot mirror (BOOT[1:0]) bits in them to avoid first 245 * aperture to be masked by 'boot mirror'. 246 */ 247 reg = readl(CREG_AXI_M_HS_CORE_BOOT) & (~0x3); 248 writel(reg, CREG_AXI_M_HS_CORE_BOOT); 249 writel(0x11111111, CREG_AXI_M_SLV0(M_HS_CORE)); 250 writel(0x63111111, CREG_AXI_M_SLV1(M_HS_CORE)); 251 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HS_CORE)); 252 writel(0x0E543210, CREG_AXI_M_OFT1(M_HS_CORE)); 253 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HS_CORE)); 254 255 writel(0x77777777, CREG_AXI_M_SLV0(M_HS_RTT)); 256 writel(0x77777777, CREG_AXI_M_SLV1(M_HS_RTT)); 257 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HS_RTT)); 258 writel(0x76543210, CREG_AXI_M_OFT1(M_HS_RTT)); 259 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HS_RTT)); 260 261 writel(0x88888888, CREG_AXI_M_SLV0(M_AXI_TUN)); 262 writel(0x88888888, CREG_AXI_M_SLV1(M_AXI_TUN)); 263 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_AXI_TUN)); 264 writel(0x76543210, CREG_AXI_M_OFT1(M_AXI_TUN)); 265 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_AXI_TUN)); 266 267 writel(0x77777777, CREG_AXI_M_SLV0(M_HDMI_VIDEO)); 268 writel(0x77777777, CREG_AXI_M_SLV1(M_HDMI_VIDEO)); 269 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HDMI_VIDEO)); 270 writel(0x76543210, CREG_AXI_M_OFT1(M_HDMI_VIDEO)); 271 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HDMI_VIDEO)); 272 273 writel(0x77777777, CREG_AXI_M_SLV0(M_HDMI_AUDIO)); 274 writel(0x77777777, CREG_AXI_M_SLV1(M_HDMI_AUDIO)); 275 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_HDMI_AUDIO)); 276 writel(0x76543210, CREG_AXI_M_OFT1(M_HDMI_AUDIO)); 277 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_HDMI_AUDIO)); 278 279 writel(0x77777777, CREG_AXI_M_SLV0(M_USB_HOST)); 280 writel(0x77999999, CREG_AXI_M_SLV1(M_USB_HOST)); 281 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_USB_HOST)); 282 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_USB_HOST)); 283 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_USB_HOST)); 284 285 writel(0x77777777, CREG_AXI_M_SLV0(M_ETHERNET)); 286 writel(0x77999999, CREG_AXI_M_SLV1(M_ETHERNET)); 287 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_ETHERNET)); 288 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_ETHERNET)); 289 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_ETHERNET)); 290 291 writel(0x77777777, CREG_AXI_M_SLV0(M_SDIO)); 292 writel(0x77999999, CREG_AXI_M_SLV1(M_SDIO)); 293 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_SDIO)); 294 writel(0x76DCBA98, CREG_AXI_M_OFT1(M_SDIO)); 295 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_SDIO)); 296 297 writel(0x77777777, CREG_AXI_M_SLV0(M_GPU)); 298 writel(0x77777777, CREG_AXI_M_SLV1(M_GPU)); 299 writel(0xFEDCBA98, CREG_AXI_M_OFT0(M_GPU)); 300 writel(0x76543210, CREG_AXI_M_OFT1(M_GPU)); 301 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_GPU)); 302 303 writel(0x00000000, CREG_AXI_M_SLV0(M_DVFS)); 304 writel(0x60000000, CREG_AXI_M_SLV1(M_DVFS)); 305 writel(0x00000000, CREG_AXI_M_OFT0(M_DVFS)); 306 writel(0x00000000, CREG_AXI_M_OFT1(M_DVFS)); 307 writel(UPDATE_VAL, CREG_AXI_M_UPDT(M_DVFS)); 308 309 hsdk_init_memory_bridge_axi_dmac(); 310 311 /* 312 * PAE remapping for DMA clients does not work due to an RTL bug, so 313 * CREG_PAE register must be programmed to all zeroes, otherwise it 314 * will cause problems with DMA to/from peripherals even if PAE40 is 315 * not used. 316 */ 317 writel(0x00000000, CREG_PAE); 318 writel(UPDATE_VAL, CREG_PAE_UPDT); 319 } 320 321 static void __init hsdk_init_early(void) 322 { 323 hsdk_init_memory_bridge(); 324 325 /* 326 * Switch SDIO external ciu clock divider from default div-by-8 to 327 * minimum possible div-by-2. 328 */ 329 iowrite32(SDIO_UHS_REG_EXT_DIV_2, (void __iomem *) SDIO_UHS_REG_EXT); 330 331 hsdk_enable_gpio_intc_wire(); 332 } 333 334 static const char *hsdk_compat[] __initconst = { 335 "snps,hsdk", 336 NULL, 337 }; 338 339 MACHINE_START(SIMULATION, "hsdk") 340 .dt_compat = hsdk_compat, 341 .init_early = hsdk_init_early, 342 .init_per_cpu = hsdk_init_per_cpu, 343 MACHINE_END 344