1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License version 2 as published 4 * by the Free Software Foundation. 5 * 6 * Copyright (C) 2011-2012 John Crispin <blogic@openwrt.org> 7 */ 8 9 #include <linux/ioport.h> 10 #include <linux/export.h> 11 #include <linux/clkdev.h> 12 #include <linux/of.h> 13 #include <linux/of_platform.h> 14 #include <linux/of_address.h> 15 16 #include <lantiq_soc.h> 17 18 #include "../clk.h" 19 #include "../prom.h" 20 21 /* clock control register */ 22 #define CGU_IFCCR 0x0018 23 #define CGU_IFCCR_VR9 0x0024 24 /* system clock register */ 25 #define CGU_SYS 0x0010 26 /* pci control register */ 27 #define CGU_PCICR 0x0034 28 #define CGU_PCICR_VR9 0x0038 29 /* ephy configuration register */ 30 #define CGU_EPHY 0x10 31 /* power control register */ 32 #define PMU_PWDCR 0x1C 33 /* power status register */ 34 #define PMU_PWDSR 0x20 35 /* power control register */ 36 #define PMU_PWDCR1 0x24 37 /* power status register */ 38 #define PMU_PWDSR1 0x28 39 /* power control register */ 40 #define PWDCR(x) ((x) ? (PMU_PWDCR1) : (PMU_PWDCR)) 41 /* power status register */ 42 #define PWDSR(x) ((x) ? (PMU_PWDSR1) : (PMU_PWDSR)) 43 44 /* clock gates that we can en/disable */ 45 #define PMU_USB0_P BIT(0) 46 #define PMU_PCI BIT(4) 47 #define PMU_DMA BIT(5) 48 #define PMU_USB0 BIT(6) 49 #define PMU_ASC0 BIT(7) 50 #define PMU_EPHY BIT(7) /* ase */ 51 #define PMU_SPI BIT(8) 52 #define PMU_DFE BIT(9) 53 #define PMU_EBU BIT(10) 54 #define PMU_STP BIT(11) 55 #define PMU_GPT BIT(12) 56 #define PMU_AHBS BIT(13) /* vr9 */ 57 #define PMU_FPI BIT(14) 58 #define PMU_AHBM BIT(15) 59 #define PMU_ASC1 BIT(17) 60 #define PMU_PPE_QSB BIT(18) 61 #define PMU_PPE_SLL01 BIT(19) 62 #define PMU_PPE_TC BIT(21) 63 #define PMU_PPE_EMA BIT(22) 64 #define PMU_PPE_DPLUM BIT(23) 65 #define PMU_PPE_DPLUS BIT(24) 66 #define PMU_USB1_P BIT(26) 67 #define PMU_USB1 BIT(27) 68 #define PMU_SWITCH BIT(28) 69 #define PMU_PPE_TOP BIT(29) 70 #define PMU_GPHY BIT(30) 71 #define PMU_PCIE_CLK BIT(31) 72 73 #define PMU1_PCIE_PHY BIT(0) 74 #define PMU1_PCIE_CTL BIT(1) 75 #define PMU1_PCIE_PDI BIT(4) 76 #define PMU1_PCIE_MSI BIT(5) 77 78 #define pmu_w32(x, y) ltq_w32((x), pmu_membase + (y)) 79 #define pmu_r32(x) ltq_r32(pmu_membase + (x)) 80 81 static void __iomem *pmu_membase; 82 void __iomem *ltq_cgu_membase; 83 void __iomem *ltq_ebu_membase; 84 85 static u32 ifccr = CGU_IFCCR; 86 static u32 pcicr = CGU_PCICR; 87 88 /* legacy function kept alive to ease clkdev transition */ 89 void ltq_pmu_enable(unsigned int module) 90 { 91 int err = 1000000; 92 93 pmu_w32(pmu_r32(PMU_PWDCR) & ~module, PMU_PWDCR); 94 do {} while (--err && (pmu_r32(PMU_PWDSR) & module)); 95 96 if (!err) 97 panic("activating PMU module failed!"); 98 } 99 EXPORT_SYMBOL(ltq_pmu_enable); 100 101 /* legacy function kept alive to ease clkdev transition */ 102 void ltq_pmu_disable(unsigned int module) 103 { 104 pmu_w32(pmu_r32(PMU_PWDCR) | module, PMU_PWDCR); 105 } 106 EXPORT_SYMBOL(ltq_pmu_disable); 107 108 /* enable a hw clock */ 109 static int cgu_enable(struct clk *clk) 110 { 111 ltq_cgu_w32(ltq_cgu_r32(ifccr) | clk->bits, ifccr); 112 return 0; 113 } 114 115 /* disable a hw clock */ 116 static void cgu_disable(struct clk *clk) 117 { 118 ltq_cgu_w32(ltq_cgu_r32(ifccr) & ~clk->bits, ifccr); 119 } 120 121 /* enable a clock gate */ 122 static int pmu_enable(struct clk *clk) 123 { 124 int retry = 1000000; 125 126 pmu_w32(pmu_r32(PWDCR(clk->module)) & ~clk->bits, 127 PWDCR(clk->module)); 128 do {} while (--retry && (pmu_r32(PWDSR(clk->module)) & clk->bits)); 129 130 if (!retry) 131 panic("activating PMU module failed!\n"); 132 133 return 0; 134 } 135 136 /* disable a clock gate */ 137 static void pmu_disable(struct clk *clk) 138 { 139 pmu_w32(pmu_r32(PWDCR(clk->module)) | clk->bits, 140 PWDCR(clk->module)); 141 } 142 143 /* the pci enable helper */ 144 static int pci_enable(struct clk *clk) 145 { 146 unsigned int val = ltq_cgu_r32(ifccr); 147 /* set bus clock speed */ 148 if (of_machine_is_compatible("lantiq,ar9") || 149 of_machine_is_compatible("lantiq,vr9")) { 150 val &= ~0x1f00000; 151 if (clk->rate == CLOCK_33M) 152 val |= 0xe00000; 153 else 154 val |= 0x700000; /* 62.5M */ 155 } else { 156 val &= ~0xf00000; 157 if (clk->rate == CLOCK_33M) 158 val |= 0x800000; 159 else 160 val |= 0x400000; /* 62.5M */ 161 } 162 ltq_cgu_w32(val, ifccr); 163 pmu_enable(clk); 164 return 0; 165 } 166 167 /* enable the external clock as a source */ 168 static int pci_ext_enable(struct clk *clk) 169 { 170 ltq_cgu_w32(ltq_cgu_r32(ifccr) & ~(1 << 16), ifccr); 171 ltq_cgu_w32((1 << 30), pcicr); 172 return 0; 173 } 174 175 /* disable the external clock as a source */ 176 static void pci_ext_disable(struct clk *clk) 177 { 178 ltq_cgu_w32(ltq_cgu_r32(ifccr) | (1 << 16), ifccr); 179 ltq_cgu_w32((1 << 31) | (1 << 30), pcicr); 180 } 181 182 /* enable a clockout source */ 183 static int clkout_enable(struct clk *clk) 184 { 185 int i; 186 187 /* get the correct rate */ 188 for (i = 0; i < 4; i++) { 189 if (clk->rates[i] == clk->rate) { 190 int shift = 14 - (2 * clk->module); 191 int enable = 7 - clk->module; 192 unsigned int val = ltq_cgu_r32(ifccr); 193 194 val &= ~(3 << shift); 195 val |= i << shift; 196 val |= enable; 197 ltq_cgu_w32(val, ifccr); 198 return 0; 199 } 200 } 201 return -1; 202 } 203 204 /* manage the clock gates via PMU */ 205 static void clkdev_add_pmu(const char *dev, const char *con, 206 unsigned int module, unsigned int bits) 207 { 208 struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 209 210 clk->cl.dev_id = dev; 211 clk->cl.con_id = con; 212 clk->cl.clk = clk; 213 clk->enable = pmu_enable; 214 clk->disable = pmu_disable; 215 clk->module = module; 216 clk->bits = bits; 217 clkdev_add(&clk->cl); 218 } 219 220 /* manage the clock generator */ 221 static void clkdev_add_cgu(const char *dev, const char *con, 222 unsigned int bits) 223 { 224 struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 225 226 clk->cl.dev_id = dev; 227 clk->cl.con_id = con; 228 clk->cl.clk = clk; 229 clk->enable = cgu_enable; 230 clk->disable = cgu_disable; 231 clk->bits = bits; 232 clkdev_add(&clk->cl); 233 } 234 235 /* pci needs its own enable function as the setup is a bit more complex */ 236 static unsigned long valid_pci_rates[] = {CLOCK_33M, CLOCK_62_5M, 0}; 237 238 static void clkdev_add_pci(void) 239 { 240 struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 241 struct clk *clk_ext = kzalloc(sizeof(struct clk), GFP_KERNEL); 242 243 /* main pci clock */ 244 clk->cl.dev_id = "17000000.pci"; 245 clk->cl.con_id = NULL; 246 clk->cl.clk = clk; 247 clk->rate = CLOCK_33M; 248 clk->rates = valid_pci_rates; 249 clk->enable = pci_enable; 250 clk->disable = pmu_disable; 251 clk->module = 0; 252 clk->bits = PMU_PCI; 253 clkdev_add(&clk->cl); 254 255 /* use internal/external bus clock */ 256 clk_ext->cl.dev_id = "17000000.pci"; 257 clk_ext->cl.con_id = "external"; 258 clk_ext->cl.clk = clk_ext; 259 clk_ext->enable = pci_ext_enable; 260 clk_ext->disable = pci_ext_disable; 261 clkdev_add(&clk_ext->cl); 262 } 263 264 /* xway socs can generate clocks on gpio pins */ 265 static unsigned long valid_clkout_rates[4][5] = { 266 {CLOCK_32_768K, CLOCK_1_536M, CLOCK_2_5M, CLOCK_12M, 0}, 267 {CLOCK_40M, CLOCK_12M, CLOCK_24M, CLOCK_48M, 0}, 268 {CLOCK_25M, CLOCK_40M, CLOCK_30M, CLOCK_60M, 0}, 269 {CLOCK_12M, CLOCK_50M, CLOCK_32_768K, CLOCK_25M, 0}, 270 }; 271 272 static void clkdev_add_clkout(void) 273 { 274 int i; 275 276 for (i = 0; i < 4; i++) { 277 struct clk *clk; 278 char *name; 279 280 name = kzalloc(sizeof("clkout0"), GFP_KERNEL); 281 sprintf(name, "clkout%d", i); 282 283 clk = kzalloc(sizeof(struct clk), GFP_KERNEL); 284 clk->cl.dev_id = "1f103000.cgu"; 285 clk->cl.con_id = name; 286 clk->cl.clk = clk; 287 clk->rate = 0; 288 clk->rates = valid_clkout_rates[i]; 289 clk->enable = clkout_enable; 290 clk->module = i; 291 clkdev_add(&clk->cl); 292 } 293 } 294 295 /* bring up all register ranges that we need for basic system control */ 296 void __init ltq_soc_init(void) 297 { 298 struct resource res_pmu, res_cgu, res_ebu; 299 struct device_node *np_pmu = 300 of_find_compatible_node(NULL, NULL, "lantiq,pmu-xway"); 301 struct device_node *np_cgu = 302 of_find_compatible_node(NULL, NULL, "lantiq,cgu-xway"); 303 struct device_node *np_ebu = 304 of_find_compatible_node(NULL, NULL, "lantiq,ebu-xway"); 305 306 /* check if all the core register ranges are available */ 307 if (!np_pmu || !np_cgu || !np_ebu) 308 panic("Failed to load core nodess from devicetree"); 309 310 if (of_address_to_resource(np_pmu, 0, &res_pmu) || 311 of_address_to_resource(np_cgu, 0, &res_cgu) || 312 of_address_to_resource(np_ebu, 0, &res_ebu)) 313 panic("Failed to get core resources"); 314 315 if ((request_mem_region(res_pmu.start, resource_size(&res_pmu), 316 res_pmu.name) < 0) || 317 (request_mem_region(res_cgu.start, resource_size(&res_cgu), 318 res_cgu.name) < 0) || 319 (request_mem_region(res_ebu.start, resource_size(&res_ebu), 320 res_ebu.name) < 0)) 321 pr_err("Failed to request core reources"); 322 323 pmu_membase = ioremap_nocache(res_pmu.start, resource_size(&res_pmu)); 324 ltq_cgu_membase = ioremap_nocache(res_cgu.start, 325 resource_size(&res_cgu)); 326 ltq_ebu_membase = ioremap_nocache(res_ebu.start, 327 resource_size(&res_ebu)); 328 if (!pmu_membase || !ltq_cgu_membase || !ltq_ebu_membase) 329 panic("Failed to remap core resources"); 330 331 /* make sure to unprotect the memory region where flash is located */ 332 ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0); 333 334 /* add our generic xway clocks */ 335 clkdev_add_pmu("10000000.fpi", NULL, 0, PMU_FPI); 336 clkdev_add_pmu("1e100400.serial", NULL, 0, PMU_ASC0); 337 clkdev_add_pmu("1e100a00.gptu", NULL, 0, PMU_GPT); 338 clkdev_add_pmu("1e100bb0.stp", NULL, 0, PMU_STP); 339 clkdev_add_pmu("1e104100.dma", NULL, 0, PMU_DMA); 340 clkdev_add_pmu("1e100800.spi", NULL, 0, PMU_SPI); 341 clkdev_add_pmu("1e105300.ebu", NULL, 0, PMU_EBU); 342 clkdev_add_clkout(); 343 344 /* add the soc dependent clocks */ 345 if (of_machine_is_compatible("lantiq,vr9")) { 346 ifccr = CGU_IFCCR_VR9; 347 pcicr = CGU_PCICR_VR9; 348 } else { 349 clkdev_add_pmu("1e180000.etop", NULL, 0, PMU_PPE); 350 } 351 352 if (!of_machine_is_compatible("lantiq,ase")) { 353 clkdev_add_pmu("1e100c00.serial", NULL, 0, PMU_ASC1); 354 clkdev_add_pci(); 355 } 356 357 if (of_machine_is_compatible("lantiq,ase")) { 358 if (ltq_cgu_r32(CGU_SYS) & (1 << 5)) 359 clkdev_add_static(CLOCK_266M, CLOCK_133M, CLOCK_133M); 360 else 361 clkdev_add_static(CLOCK_133M, CLOCK_133M, CLOCK_133M); 362 clkdev_add_cgu("1e180000.etop", "ephycgu", CGU_EPHY), 363 clkdev_add_pmu("1e180000.etop", "ephy", 0, PMU_EPHY); 364 } else if (of_machine_is_compatible("lantiq,vr9")) { 365 clkdev_add_static(ltq_vr9_cpu_hz(), ltq_vr9_fpi_hz(), 366 ltq_vr9_fpi_hz()); 367 clkdev_add_pmu("1d900000.pcie", "phy", 1, PMU1_PCIE_PHY); 368 clkdev_add_pmu("1d900000.pcie", "bus", 0, PMU_PCIE_CLK); 369 clkdev_add_pmu("1d900000.pcie", "msi", 1, PMU1_PCIE_MSI); 370 clkdev_add_pmu("1d900000.pcie", "pdi", 1, PMU1_PCIE_PDI); 371 clkdev_add_pmu("1d900000.pcie", "ctl", 1, PMU1_PCIE_CTL); 372 clkdev_add_pmu("1d900000.pcie", "ahb", 0, PMU_AHBM | PMU_AHBS); 373 clkdev_add_pmu("1e108000.eth", NULL, 0, 374 PMU_SWITCH | PMU_PPE_DPLUS | PMU_PPE_DPLUM | 375 PMU_PPE_EMA | PMU_PPE_TC | PMU_PPE_SLL01 | 376 PMU_PPE_QSB | PMU_PPE_TOP); 377 } else if (of_machine_is_compatible("lantiq,ar9")) { 378 clkdev_add_static(ltq_ar9_cpu_hz(), ltq_ar9_fpi_hz(), 379 ltq_ar9_fpi_hz()); 380 clkdev_add_pmu("1e180000.etop", "switch", 0, PMU_SWITCH); 381 } else { 382 clkdev_add_static(ltq_danube_cpu_hz(), ltq_danube_fpi_hz(), 383 ltq_danube_fpi_hz()); 384 } 385 } 386