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