1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved. 7 * Copyright (C) 2006 FON Technology, SL. 8 * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org> 9 * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org> 10 * Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com> 11 */ 12 13 /* 14 * Platform devices for Atheros AR5312 SoCs 15 */ 16 17 #include <linux/init.h> 18 #include <linux/kernel.h> 19 #include <linux/bitops.h> 20 #include <linux/irqdomain.h> 21 #include <linux/interrupt.h> 22 #include <linux/platform_device.h> 23 #include <linux/mtd/physmap.h> 24 #include <linux/reboot.h> 25 #include <asm/bootinfo.h> 26 #include <asm/reboot.h> 27 #include <asm/time.h> 28 29 #include <ath25_platform.h> 30 31 #include "devices.h" 32 #include "ar5312.h" 33 #include "ar5312_regs.h" 34 35 static void __iomem *ar5312_rst_base; 36 static struct irq_domain *ar5312_misc_irq_domain; 37 38 static inline u32 ar5312_rst_reg_read(u32 reg) 39 { 40 return __raw_readl(ar5312_rst_base + reg); 41 } 42 43 static inline void ar5312_rst_reg_write(u32 reg, u32 val) 44 { 45 __raw_writel(val, ar5312_rst_base + reg); 46 } 47 48 static inline void ar5312_rst_reg_mask(u32 reg, u32 mask, u32 val) 49 { 50 u32 ret = ar5312_rst_reg_read(reg); 51 52 ret &= ~mask; 53 ret |= val; 54 ar5312_rst_reg_write(reg, ret); 55 } 56 57 static irqreturn_t ar5312_ahb_err_handler(int cpl, void *dev_id) 58 { 59 u32 proc1 = ar5312_rst_reg_read(AR5312_PROC1); 60 u32 proc_addr = ar5312_rst_reg_read(AR5312_PROCADDR); /* clears error */ 61 u32 dma1 = ar5312_rst_reg_read(AR5312_DMA1); 62 u32 dma_addr = ar5312_rst_reg_read(AR5312_DMAADDR); /* clears error */ 63 64 pr_emerg("AHB interrupt: PROCADDR=0x%8.8x PROC1=0x%8.8x DMAADDR=0x%8.8x DMA1=0x%8.8x\n", 65 proc_addr, proc1, dma_addr, dma1); 66 67 machine_restart("AHB error"); /* Catastrophic failure */ 68 return IRQ_HANDLED; 69 } 70 71 static struct irqaction ar5312_ahb_err_interrupt = { 72 .handler = ar5312_ahb_err_handler, 73 .name = "ar5312-ahb-error", 74 }; 75 76 static void ar5312_misc_irq_handler(unsigned irq, struct irq_desc *desc) 77 { 78 u32 pending = ar5312_rst_reg_read(AR5312_ISR) & 79 ar5312_rst_reg_read(AR5312_IMR); 80 unsigned nr, misc_irq = 0; 81 82 if (pending) { 83 struct irq_domain *domain = irq_get_handler_data(irq); 84 85 nr = __ffs(pending); 86 misc_irq = irq_find_mapping(domain, nr); 87 } 88 89 if (misc_irq) { 90 generic_handle_irq(misc_irq); 91 if (nr == AR5312_MISC_IRQ_TIMER) 92 ar5312_rst_reg_read(AR5312_TIMER); 93 } else { 94 spurious_interrupt(); 95 } 96 } 97 98 /* Enable the specified AR5312_MISC_IRQ interrupt */ 99 static void ar5312_misc_irq_unmask(struct irq_data *d) 100 { 101 ar5312_rst_reg_mask(AR5312_IMR, 0, BIT(d->hwirq)); 102 } 103 104 /* Disable the specified AR5312_MISC_IRQ interrupt */ 105 static void ar5312_misc_irq_mask(struct irq_data *d) 106 { 107 ar5312_rst_reg_mask(AR5312_IMR, BIT(d->hwirq), 0); 108 ar5312_rst_reg_read(AR5312_IMR); /* flush write buffer */ 109 } 110 111 static struct irq_chip ar5312_misc_irq_chip = { 112 .name = "ar5312-misc", 113 .irq_unmask = ar5312_misc_irq_unmask, 114 .irq_mask = ar5312_misc_irq_mask, 115 }; 116 117 static int ar5312_misc_irq_map(struct irq_domain *d, unsigned irq, 118 irq_hw_number_t hw) 119 { 120 irq_set_chip_and_handler(irq, &ar5312_misc_irq_chip, handle_level_irq); 121 return 0; 122 } 123 124 static struct irq_domain_ops ar5312_misc_irq_domain_ops = { 125 .map = ar5312_misc_irq_map, 126 }; 127 128 static void ar5312_irq_dispatch(void) 129 { 130 u32 pending = read_c0_status() & read_c0_cause(); 131 132 if (pending & CAUSEF_IP2) 133 do_IRQ(AR5312_IRQ_WLAN0); 134 else if (pending & CAUSEF_IP5) 135 do_IRQ(AR5312_IRQ_WLAN1); 136 else if (pending & CAUSEF_IP6) 137 do_IRQ(AR5312_IRQ_MISC); 138 else if (pending & CAUSEF_IP7) 139 do_IRQ(ATH25_IRQ_CPU_CLOCK); 140 else 141 spurious_interrupt(); 142 } 143 144 void __init ar5312_arch_init_irq(void) 145 { 146 struct irq_domain *domain; 147 unsigned irq; 148 149 ath25_irq_dispatch = ar5312_irq_dispatch; 150 151 domain = irq_domain_add_linear(NULL, AR5312_MISC_IRQ_COUNT, 152 &ar5312_misc_irq_domain_ops, NULL); 153 if (!domain) 154 panic("Failed to add IRQ domain"); 155 156 irq = irq_create_mapping(domain, AR5312_MISC_IRQ_AHB_PROC); 157 setup_irq(irq, &ar5312_ahb_err_interrupt); 158 159 irq_set_chained_handler(AR5312_IRQ_MISC, ar5312_misc_irq_handler); 160 irq_set_handler_data(AR5312_IRQ_MISC, domain); 161 162 ar5312_misc_irq_domain = domain; 163 } 164 165 static struct physmap_flash_data ar5312_flash_data = { 166 .width = 2, 167 }; 168 169 static struct resource ar5312_flash_resource = { 170 .start = AR5312_FLASH_BASE, 171 .end = AR5312_FLASH_BASE + AR5312_FLASH_SIZE - 1, 172 .flags = IORESOURCE_MEM, 173 }; 174 175 static struct platform_device ar5312_physmap_flash = { 176 .name = "physmap-flash", 177 .id = 0, 178 .dev.platform_data = &ar5312_flash_data, 179 .resource = &ar5312_flash_resource, 180 .num_resources = 1, 181 }; 182 183 static void __init ar5312_flash_init(void) 184 { 185 void __iomem *flashctl_base; 186 u32 ctl; 187 188 flashctl_base = ioremap_nocache(AR5312_FLASHCTL_BASE, 189 AR5312_FLASHCTL_SIZE); 190 191 ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL0); 192 ctl &= AR5312_FLASHCTL_MW; 193 194 /* fixup flash width */ 195 switch (ctl) { 196 case AR5312_FLASHCTL_MW16: 197 ar5312_flash_data.width = 2; 198 break; 199 case AR5312_FLASHCTL_MW8: 200 default: 201 ar5312_flash_data.width = 1; 202 break; 203 } 204 205 /* 206 * Configure flash bank 0. 207 * Assume 8M window size. Flash will be aliased if it's smaller 208 */ 209 ctl |= AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC_8M | AR5312_FLASHCTL_RBLE; 210 ctl |= 0x01 << AR5312_FLASHCTL_IDCY_S; 211 ctl |= 0x07 << AR5312_FLASHCTL_WST1_S; 212 ctl |= 0x07 << AR5312_FLASHCTL_WST2_S; 213 __raw_writel(ctl, flashctl_base + AR5312_FLASHCTL0); 214 215 /* Disable other flash banks */ 216 ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL1); 217 ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC); 218 __raw_writel(ctl, flashctl_base + AR5312_FLASHCTL1); 219 ctl = __raw_readl(flashctl_base + AR5312_FLASHCTL2); 220 ctl &= ~(AR5312_FLASHCTL_E | AR5312_FLASHCTL_AC); 221 __raw_writel(ctl, flashctl_base + AR5312_FLASHCTL2); 222 223 iounmap(flashctl_base); 224 } 225 226 void __init ar5312_init_devices(void) 227 { 228 struct ath25_boarddata *config; 229 230 ar5312_flash_init(); 231 232 /* Locate board/radio config data */ 233 ath25_find_config(AR5312_FLASH_BASE, AR5312_FLASH_SIZE); 234 config = ath25_board.config; 235 236 /* AR2313 has CPU minor rev. 10 */ 237 if ((current_cpu_data.processor_id & 0xff) == 0x0a) 238 ath25_soc = ATH25_SOC_AR2313; 239 240 /* AR2312 shares the same Silicon ID as AR5312 */ 241 else if (config->flags & BD_ISCASPER) 242 ath25_soc = ATH25_SOC_AR2312; 243 244 /* Everything else is probably AR5312 or compatible */ 245 else 246 ath25_soc = ATH25_SOC_AR5312; 247 248 platform_device_register(&ar5312_physmap_flash); 249 250 switch (ath25_soc) { 251 case ATH25_SOC_AR5312: 252 if (!ath25_board.radio) 253 return; 254 255 if (!(config->flags & BD_WLAN0)) 256 break; 257 258 ath25_add_wmac(0, AR5312_WLAN0_BASE, AR5312_IRQ_WLAN0); 259 break; 260 case ATH25_SOC_AR2312: 261 case ATH25_SOC_AR2313: 262 if (!ath25_board.radio) 263 return; 264 break; 265 default: 266 break; 267 } 268 269 if (config->flags & BD_WLAN1) 270 ath25_add_wmac(1, AR5312_WLAN1_BASE, AR5312_IRQ_WLAN1); 271 } 272 273 static void ar5312_restart(char *command) 274 { 275 /* reset the system */ 276 local_irq_disable(); 277 while (1) 278 ar5312_rst_reg_write(AR5312_RESET, AR5312_RESET_SYSTEM); 279 } 280 281 /* 282 * This table is indexed by bits 5..4 of the CLOCKCTL1 register 283 * to determine the predevisor value. 284 */ 285 static unsigned clockctl1_predivide_table[4] __initdata = { 1, 2, 4, 5 }; 286 287 static unsigned __init ar5312_cpu_frequency(void) 288 { 289 u32 scratch, devid, clock_ctl1; 290 u32 predivide_mask, multiplier_mask, doubler_mask; 291 unsigned predivide_shift, multiplier_shift; 292 unsigned predivide_select, predivisor, multiplier; 293 294 /* Trust the bootrom's idea of cpu frequency. */ 295 scratch = ar5312_rst_reg_read(AR5312_SCRATCH); 296 if (scratch) 297 return scratch; 298 299 devid = ar5312_rst_reg_read(AR5312_REV); 300 devid = (devid & AR5312_REV_MAJ) >> AR5312_REV_MAJ_S; 301 if (devid == AR5312_REV_MAJ_AR2313) { 302 predivide_mask = AR2313_CLOCKCTL1_PREDIVIDE_MASK; 303 predivide_shift = AR2313_CLOCKCTL1_PREDIVIDE_SHIFT; 304 multiplier_mask = AR2313_CLOCKCTL1_MULTIPLIER_MASK; 305 multiplier_shift = AR2313_CLOCKCTL1_MULTIPLIER_SHIFT; 306 doubler_mask = AR2313_CLOCKCTL1_DOUBLER_MASK; 307 } else { /* AR5312 and AR2312 */ 308 predivide_mask = AR5312_CLOCKCTL1_PREDIVIDE_MASK; 309 predivide_shift = AR5312_CLOCKCTL1_PREDIVIDE_SHIFT; 310 multiplier_mask = AR5312_CLOCKCTL1_MULTIPLIER_MASK; 311 multiplier_shift = AR5312_CLOCKCTL1_MULTIPLIER_SHIFT; 312 doubler_mask = AR5312_CLOCKCTL1_DOUBLER_MASK; 313 } 314 315 /* 316 * Clocking is derived from a fixed 40MHz input clock. 317 * 318 * cpu_freq = input_clock * MULT (where MULT is PLL multiplier) 319 * sys_freq = cpu_freq / 4 (used for APB clock, serial, 320 * flash, Timer, Watchdog Timer) 321 * 322 * cnt_freq = cpu_freq / 2 (use for CPU count/compare) 323 * 324 * So, for example, with a PLL multiplier of 5, we have 325 * 326 * cpu_freq = 200MHz 327 * sys_freq = 50MHz 328 * cnt_freq = 100MHz 329 * 330 * We compute the CPU frequency, based on PLL settings. 331 */ 332 333 clock_ctl1 = ar5312_rst_reg_read(AR5312_CLOCKCTL1); 334 predivide_select = (clock_ctl1 & predivide_mask) >> predivide_shift; 335 predivisor = clockctl1_predivide_table[predivide_select]; 336 multiplier = (clock_ctl1 & multiplier_mask) >> multiplier_shift; 337 338 if (clock_ctl1 & doubler_mask) 339 multiplier <<= 1; 340 341 return (40000000 / predivisor) * multiplier; 342 } 343 344 static inline unsigned ar5312_sys_frequency(void) 345 { 346 return ar5312_cpu_frequency() / 4; 347 } 348 349 void __init ar5312_plat_time_init(void) 350 { 351 mips_hpt_frequency = ar5312_cpu_frequency() / 2; 352 } 353 354 void __init ar5312_plat_mem_setup(void) 355 { 356 void __iomem *sdram_base; 357 u32 memsize, memcfg, bank0_ac, bank1_ac; 358 u32 devid; 359 360 /* Detect memory size */ 361 sdram_base = ioremap_nocache(AR5312_SDRAMCTL_BASE, 362 AR5312_SDRAMCTL_SIZE); 363 memcfg = __raw_readl(sdram_base + AR5312_MEM_CFG1); 364 bank0_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC0); 365 bank1_ac = ATH25_REG_MS(memcfg, AR5312_MEM_CFG1_AC1); 366 memsize = (bank0_ac ? (1 << (bank0_ac + 1)) : 0) + 367 (bank1_ac ? (1 << (bank1_ac + 1)) : 0); 368 memsize <<= 20; 369 add_memory_region(0, memsize, BOOT_MEM_RAM); 370 iounmap(sdram_base); 371 372 ar5312_rst_base = ioremap_nocache(AR5312_RST_BASE, AR5312_RST_SIZE); 373 374 devid = ar5312_rst_reg_read(AR5312_REV); 375 devid >>= AR5312_REV_WMAC_MIN_S; 376 devid &= AR5312_REV_CHIP; 377 ath25_board.devid = (u16)devid; 378 379 /* Clear any lingering AHB errors */ 380 ar5312_rst_reg_read(AR5312_PROCADDR); 381 ar5312_rst_reg_read(AR5312_DMAADDR); 382 ar5312_rst_reg_write(AR5312_WDT_CTRL, AR5312_WDT_CTRL_IGNORE); 383 384 _machine_restart = ar5312_restart; 385 } 386 387 void __init ar5312_arch_init(void) 388 { 389 unsigned irq = irq_create_mapping(ar5312_misc_irq_domain, 390 AR5312_MISC_IRQ_UART0); 391 392 ath25_serial_setup(AR5312_UART0_BASE, irq, ar5312_sys_frequency()); 393 } 394