1 /* 2 * Copyright 2011-2013 Freescale Semiconductor, Inc. 3 * Copyright 2011 Linaro Ltd. 4 * 5 * The code contained herein is licensed under the GNU General Public 6 * License. You may obtain a copy of the GNU General Public License 7 * Version 2 or later at the following locations: 8 * 9 * http://www.opensource.org/licenses/gpl-license.html 10 * http://www.gnu.org/copyleft/gpl.html 11 */ 12 13 #include <linux/clk.h> 14 #include <linux/clkdev.h> 15 #include <linux/cpu.h> 16 #include <linux/delay.h> 17 #include <linux/export.h> 18 #include <linux/init.h> 19 #include <linux/io.h> 20 #include <linux/irq.h> 21 #include <linux/irqchip.h> 22 #include <linux/of.h> 23 #include <linux/of_address.h> 24 #include <linux/of_irq.h> 25 #include <linux/of_platform.h> 26 #include <linux/pm_opp.h> 27 #include <linux/pci.h> 28 #include <linux/phy.h> 29 #include <linux/reboot.h> 30 #include <linux/regmap.h> 31 #include <linux/micrel_phy.h> 32 #include <linux/mfd/syscon.h> 33 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> 34 #include <asm/mach/arch.h> 35 #include <asm/mach/map.h> 36 #include <asm/system_misc.h> 37 38 #include "common.h" 39 #include "cpuidle.h" 40 #include "hardware.h" 41 42 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */ 43 static int ksz9021rn_phy_fixup(struct phy_device *phydev) 44 { 45 if (IS_BUILTIN(CONFIG_PHYLIB)) { 46 /* min rx data delay */ 47 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL, 48 0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW); 49 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0x0000); 50 51 /* max rx/tx clock delay, min rx/tx control delay */ 52 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL, 53 0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW); 54 phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0xf0f0); 55 phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL, 56 MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW); 57 } 58 59 return 0; 60 } 61 62 static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val) 63 { 64 phy_write(dev, 0x0d, device); 65 phy_write(dev, 0x0e, reg); 66 phy_write(dev, 0x0d, (1 << 14) | device); 67 phy_write(dev, 0x0e, val); 68 } 69 70 static int ksz9031rn_phy_fixup(struct phy_device *dev) 71 { 72 /* 73 * min rx data delay, max rx/tx clock delay, 74 * min rx/tx control delay 75 */ 76 mmd_write_reg(dev, 2, 4, 0); 77 mmd_write_reg(dev, 2, 5, 0); 78 mmd_write_reg(dev, 2, 8, 0x003ff); 79 80 return 0; 81 } 82 83 /* 84 * fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High 85 * as they are used for slots1-7 PERST# 86 */ 87 static void ventana_pciesw_early_fixup(struct pci_dev *dev) 88 { 89 u32 dw; 90 91 if (!of_machine_is_compatible("gw,ventana")) 92 return; 93 94 if (dev->devfn != 0) 95 return; 96 97 pci_read_config_dword(dev, 0x62c, &dw); 98 dw |= 0xaaa8; // GPIO1-7 outputs 99 pci_write_config_dword(dev, 0x62c, dw); 100 101 pci_read_config_dword(dev, 0x644, &dw); 102 dw |= 0xfe; // GPIO1-7 output high 103 pci_write_config_dword(dev, 0x644, dw); 104 105 msleep(100); 106 } 107 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup); 108 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup); 109 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup); 110 111 static int ar8031_phy_fixup(struct phy_device *dev) 112 { 113 u16 val; 114 115 /* To enable AR8031 output a 125MHz clk from CLK_25M */ 116 phy_write(dev, 0xd, 0x7); 117 phy_write(dev, 0xe, 0x8016); 118 phy_write(dev, 0xd, 0x4007); 119 120 val = phy_read(dev, 0xe); 121 val &= 0xffe3; 122 val |= 0x18; 123 phy_write(dev, 0xe, val); 124 125 /* introduce tx clock delay */ 126 phy_write(dev, 0x1d, 0x5); 127 val = phy_read(dev, 0x1e); 128 val |= 0x0100; 129 phy_write(dev, 0x1e, val); 130 131 return 0; 132 } 133 134 #define PHY_ID_AR8031 0x004dd074 135 136 static int ar8035_phy_fixup(struct phy_device *dev) 137 { 138 u16 val; 139 140 /* Ar803x phy SmartEEE feature cause link status generates glitch, 141 * which cause ethernet link down/up issue, so disable SmartEEE 142 */ 143 phy_write(dev, 0xd, 0x3); 144 phy_write(dev, 0xe, 0x805d); 145 phy_write(dev, 0xd, 0x4003); 146 147 val = phy_read(dev, 0xe); 148 phy_write(dev, 0xe, val & ~(1 << 8)); 149 150 /* 151 * Enable 125MHz clock from CLK_25M on the AR8031. This 152 * is fed in to the IMX6 on the ENET_REF_CLK (V22) pad. 153 * Also, introduce a tx clock delay. 154 * 155 * This is the same as is the AR8031 fixup. 156 */ 157 ar8031_phy_fixup(dev); 158 159 /*check phy power*/ 160 val = phy_read(dev, 0x0); 161 if (val & BMCR_PDOWN) 162 phy_write(dev, 0x0, val & ~BMCR_PDOWN); 163 164 return 0; 165 } 166 167 #define PHY_ID_AR8035 0x004dd072 168 169 static void __init imx6q_enet_phy_init(void) 170 { 171 if (IS_BUILTIN(CONFIG_PHYLIB)) { 172 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK, 173 ksz9021rn_phy_fixup); 174 phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK, 175 ksz9031rn_phy_fixup); 176 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff, 177 ar8031_phy_fixup); 178 phy_register_fixup_for_uid(PHY_ID_AR8035, 0xffffffef, 179 ar8035_phy_fixup); 180 } 181 } 182 183 static void __init imx6q_1588_init(void) 184 { 185 struct device_node *np; 186 struct clk *ptp_clk; 187 struct clk *enet_ref; 188 struct regmap *gpr; 189 u32 clksel; 190 191 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-fec"); 192 if (!np) { 193 pr_warn("%s: failed to find fec node\n", __func__); 194 return; 195 } 196 197 ptp_clk = of_clk_get(np, 2); 198 if (IS_ERR(ptp_clk)) { 199 pr_warn("%s: failed to get ptp clock\n", __func__); 200 goto put_node; 201 } 202 203 enet_ref = clk_get_sys(NULL, "enet_ref"); 204 if (IS_ERR(enet_ref)) { 205 pr_warn("%s: failed to get enet clock\n", __func__); 206 goto put_ptp_clk; 207 } 208 209 /* 210 * If enet_ref from ANATOP/CCM is the PTP clock source, we need to 211 * set bit IOMUXC_GPR1[21]. Or the PTP clock must be from pad 212 * (external OSC), and we need to clear the bit. 213 */ 214 clksel = clk_is_match(ptp_clk, enet_ref) ? 215 IMX6Q_GPR1_ENET_CLK_SEL_ANATOP : 216 IMX6Q_GPR1_ENET_CLK_SEL_PAD; 217 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); 218 if (!IS_ERR(gpr)) 219 regmap_update_bits(gpr, IOMUXC_GPR1, 220 IMX6Q_GPR1_ENET_CLK_SEL_MASK, 221 clksel); 222 else 223 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n"); 224 225 clk_put(enet_ref); 226 put_ptp_clk: 227 clk_put(ptp_clk); 228 put_node: 229 of_node_put(np); 230 } 231 232 static void __init imx6q_axi_init(void) 233 { 234 struct regmap *gpr; 235 unsigned int mask; 236 237 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr"); 238 if (!IS_ERR(gpr)) { 239 /* 240 * Enable the cacheable attribute of VPU and IPU 241 * AXI transactions. 242 */ 243 mask = IMX6Q_GPR4_VPU_WR_CACHE_SEL | 244 IMX6Q_GPR4_VPU_RD_CACHE_SEL | 245 IMX6Q_GPR4_VPU_P_WR_CACHE_VAL | 246 IMX6Q_GPR4_VPU_P_RD_CACHE_VAL_MASK | 247 IMX6Q_GPR4_IPU_WR_CACHE_CTL | 248 IMX6Q_GPR4_IPU_RD_CACHE_CTL; 249 regmap_update_bits(gpr, IOMUXC_GPR4, mask, mask); 250 251 /* Increase IPU read QoS priority */ 252 regmap_update_bits(gpr, IOMUXC_GPR6, 253 IMX6Q_GPR6_IPU1_ID00_RD_QOS_MASK | 254 IMX6Q_GPR6_IPU1_ID01_RD_QOS_MASK, 255 (0xf << 16) | (0x7 << 20)); 256 regmap_update_bits(gpr, IOMUXC_GPR7, 257 IMX6Q_GPR7_IPU2_ID00_RD_QOS_MASK | 258 IMX6Q_GPR7_IPU2_ID01_RD_QOS_MASK, 259 (0xf << 16) | (0x7 << 20)); 260 } else { 261 pr_warn("failed to find fsl,imx6q-iomuxc-gpr regmap\n"); 262 } 263 } 264 265 static void __init imx6q_init_machine(void) 266 { 267 struct device *parent; 268 269 imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q", 270 imx_get_soc_revision()); 271 272 parent = imx_soc_device_init(); 273 if (parent == NULL) 274 pr_warn("failed to initialize soc device\n"); 275 276 imx6q_enet_phy_init(); 277 278 of_platform_populate(NULL, of_default_bus_match_table, NULL, parent); 279 280 imx_anatop_init(); 281 cpu_is_imx6q() ? imx6q_pm_init() : imx6dl_pm_init(); 282 imx6q_1588_init(); 283 imx6q_axi_init(); 284 } 285 286 #define OCOTP_CFG3 0x440 287 #define OCOTP_CFG3_SPEED_SHIFT 16 288 #define OCOTP_CFG3_SPEED_1P2GHZ 0x3 289 #define OCOTP_CFG3_SPEED_996MHZ 0x2 290 #define OCOTP_CFG3_SPEED_852MHZ 0x1 291 292 static void __init imx6q_opp_check_speed_grading(struct device *cpu_dev) 293 { 294 struct device_node *np; 295 void __iomem *base; 296 u32 val; 297 298 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp"); 299 if (!np) { 300 pr_warn("failed to find ocotp node\n"); 301 return; 302 } 303 304 base = of_iomap(np, 0); 305 if (!base) { 306 pr_warn("failed to map ocotp\n"); 307 goto put_node; 308 } 309 310 /* 311 * SPEED_GRADING[1:0] defines the max speed of ARM: 312 * 2b'11: 1200000000Hz; 313 * 2b'10: 996000000Hz; 314 * 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. 315 * 2b'00: 792000000Hz; 316 * We need to set the max speed of ARM according to fuse map. 317 */ 318 val = readl_relaxed(base + OCOTP_CFG3); 319 val >>= OCOTP_CFG3_SPEED_SHIFT; 320 val &= 0x3; 321 322 if ((val != OCOTP_CFG3_SPEED_1P2GHZ) && cpu_is_imx6q()) 323 if (dev_pm_opp_disable(cpu_dev, 1200000000)) 324 pr_warn("failed to disable 1.2 GHz OPP\n"); 325 if (val < OCOTP_CFG3_SPEED_996MHZ) 326 if (dev_pm_opp_disable(cpu_dev, 996000000)) 327 pr_warn("failed to disable 996 MHz OPP\n"); 328 if (cpu_is_imx6q()) { 329 if (val != OCOTP_CFG3_SPEED_852MHZ) 330 if (dev_pm_opp_disable(cpu_dev, 852000000)) 331 pr_warn("failed to disable 852 MHz OPP\n"); 332 } 333 iounmap(base); 334 put_node: 335 of_node_put(np); 336 } 337 338 static void __init imx6q_opp_init(void) 339 { 340 struct device_node *np; 341 struct device *cpu_dev = get_cpu_device(0); 342 343 if (!cpu_dev) { 344 pr_warn("failed to get cpu0 device\n"); 345 return; 346 } 347 np = of_node_get(cpu_dev->of_node); 348 if (!np) { 349 pr_warn("failed to find cpu0 node\n"); 350 return; 351 } 352 353 if (of_init_opp_table(cpu_dev)) { 354 pr_warn("failed to init OPP table\n"); 355 goto put_node; 356 } 357 358 imx6q_opp_check_speed_grading(cpu_dev); 359 360 put_node: 361 of_node_put(np); 362 } 363 364 static struct platform_device imx6q_cpufreq_pdev = { 365 .name = "imx6q-cpufreq", 366 }; 367 368 static void __init imx6q_init_late(void) 369 { 370 /* 371 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point 372 * to run cpuidle on them. 373 */ 374 if (imx_get_soc_revision() > IMX_CHIP_REVISION_1_1) 375 imx6q_cpuidle_init(); 376 377 if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) { 378 imx6q_opp_init(); 379 platform_device_register(&imx6q_cpufreq_pdev); 380 } 381 } 382 383 static void __init imx6q_map_io(void) 384 { 385 debug_ll_io_init(); 386 imx_scu_map_io(); 387 } 388 389 static void __init imx6q_init_irq(void) 390 { 391 imx_gpc_check_dt(); 392 imx_init_revision_from_anatop(); 393 imx_init_l2cache(); 394 imx_src_init(); 395 irqchip_init(); 396 } 397 398 static const char * const imx6q_dt_compat[] __initconst = { 399 "fsl,imx6dl", 400 "fsl,imx6q", 401 NULL, 402 }; 403 404 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)") 405 .smp = smp_ops(imx_smp_ops), 406 .map_io = imx6q_map_io, 407 .init_irq = imx6q_init_irq, 408 .init_machine = imx6q_init_machine, 409 .init_late = imx6q_init_late, 410 .dt_compat = imx6q_dt_compat, 411 MACHINE_END 412