1 /* 2 * Copyright 2015 Vladimir Zapolskiy <vz@mleia.com> 3 * 4 * The code contained herein is licensed under the GNU General Public 5 * License. You may obtain a copy of the GNU General Public License 6 * Version 2 or later at the following locations: 7 * 8 * http://www.opensource.org/licenses/gpl-license.html 9 * http://www.gnu.org/copyleft/gpl.html 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/clk-provider.h> 14 #include <linux/of_address.h> 15 #include <linux/regmap.h> 16 17 #include <dt-bindings/clock/lpc32xx-clock.h> 18 19 #undef pr_fmt 20 #define pr_fmt(fmt) "%s: " fmt, __func__ 21 22 /* Common bitfield definitions for x397 PLL (lock), USB PLL and HCLK PLL */ 23 #define PLL_CTRL_ENABLE BIT(16) 24 #define PLL_CTRL_BYPASS BIT(15) 25 #define PLL_CTRL_DIRECT BIT(14) 26 #define PLL_CTRL_FEEDBACK BIT(13) 27 #define PLL_CTRL_POSTDIV (BIT(12)|BIT(11)) 28 #define PLL_CTRL_PREDIV (BIT(10)|BIT(9)) 29 #define PLL_CTRL_FEEDDIV (0xFF << 1) 30 #define PLL_CTRL_LOCK BIT(0) 31 32 /* Clock registers on System Control Block */ 33 #define LPC32XX_CLKPWR_DEBUG_CTRL 0x00 34 #define LPC32XX_CLKPWR_USB_DIV 0x1C 35 #define LPC32XX_CLKPWR_HCLKDIV_CTRL 0x40 36 #define LPC32XX_CLKPWR_PWR_CTRL 0x44 37 #define LPC32XX_CLKPWR_PLL397_CTRL 0x48 38 #define LPC32XX_CLKPWR_OSC_CTRL 0x4C 39 #define LPC32XX_CLKPWR_SYSCLK_CTRL 0x50 40 #define LPC32XX_CLKPWR_LCDCLK_CTRL 0x54 41 #define LPC32XX_CLKPWR_HCLKPLL_CTRL 0x58 42 #define LPC32XX_CLKPWR_ADCCLK_CTRL1 0x60 43 #define LPC32XX_CLKPWR_USB_CTRL 0x64 44 #define LPC32XX_CLKPWR_SSP_CTRL 0x78 45 #define LPC32XX_CLKPWR_I2S_CTRL 0x7C 46 #define LPC32XX_CLKPWR_MS_CTRL 0x80 47 #define LPC32XX_CLKPWR_MACCLK_CTRL 0x90 48 #define LPC32XX_CLKPWR_TEST_CLK_CTRL 0xA4 49 #define LPC32XX_CLKPWR_I2CCLK_CTRL 0xAC 50 #define LPC32XX_CLKPWR_KEYCLK_CTRL 0xB0 51 #define LPC32XX_CLKPWR_ADCCLK_CTRL 0xB4 52 #define LPC32XX_CLKPWR_PWMCLK_CTRL 0xB8 53 #define LPC32XX_CLKPWR_TIMCLK_CTRL 0xBC 54 #define LPC32XX_CLKPWR_TIMCLK_CTRL1 0xC0 55 #define LPC32XX_CLKPWR_SPI_CTRL 0xC4 56 #define LPC32XX_CLKPWR_FLASHCLK_CTRL 0xC8 57 #define LPC32XX_CLKPWR_UART3_CLK_CTRL 0xD0 58 #define LPC32XX_CLKPWR_UART4_CLK_CTRL 0xD4 59 #define LPC32XX_CLKPWR_UART5_CLK_CTRL 0xD8 60 #define LPC32XX_CLKPWR_UART6_CLK_CTRL 0xDC 61 #define LPC32XX_CLKPWR_IRDA_CLK_CTRL 0xE0 62 #define LPC32XX_CLKPWR_UART_CLK_CTRL 0xE4 63 #define LPC32XX_CLKPWR_DMA_CLK_CTRL 0xE8 64 65 /* Clock registers on USB controller */ 66 #define LPC32XX_USB_CLK_CTRL 0xF4 67 #define LPC32XX_USB_CLK_STS 0xF8 68 69 static struct regmap_config lpc32xx_scb_regmap_config = { 70 .name = "scb", 71 .reg_bits = 32, 72 .val_bits = 32, 73 .reg_stride = 4, 74 .val_format_endian = REGMAP_ENDIAN_LITTLE, 75 .max_register = 0x114, 76 .fast_io = true, 77 }; 78 79 static struct regmap *clk_regmap; 80 static void __iomem *usb_clk_vbase; 81 82 enum { 83 LPC32XX_USB_CLK_OTG = LPC32XX_USB_CLK_HOST + 1, 84 LPC32XX_USB_CLK_AHB, 85 86 LPC32XX_USB_CLK_MAX = LPC32XX_USB_CLK_AHB + 1, 87 }; 88 89 enum { 90 /* Start from the last defined clock in dt bindings */ 91 LPC32XX_CLK_ADC_DIV = LPC32XX_CLK_PERIPH + 1, 92 LPC32XX_CLK_ADC_RTC, 93 LPC32XX_CLK_TEST1, 94 LPC32XX_CLK_TEST2, 95 96 /* System clocks, PLL 397x and HCLK PLL clocks */ 97 LPC32XX_CLK_OSC, 98 LPC32XX_CLK_SYS, 99 LPC32XX_CLK_PLL397X, 100 LPC32XX_CLK_HCLK_DIV_PERIPH, 101 LPC32XX_CLK_HCLK_DIV, 102 LPC32XX_CLK_HCLK, 103 LPC32XX_CLK_ARM, 104 LPC32XX_CLK_ARM_VFP, 105 106 /* USB clocks */ 107 LPC32XX_CLK_USB_PLL, 108 LPC32XX_CLK_USB_DIV, 109 LPC32XX_CLK_USB, 110 111 /* Only one control PWR_CTRL[10] for both muxes */ 112 LPC32XX_CLK_PERIPH_HCLK_MUX, 113 LPC32XX_CLK_PERIPH_ARM_MUX, 114 115 /* Only one control PWR_CTRL[2] for all three muxes */ 116 LPC32XX_CLK_SYSCLK_PERIPH_MUX, 117 LPC32XX_CLK_SYSCLK_HCLK_MUX, 118 LPC32XX_CLK_SYSCLK_ARM_MUX, 119 120 /* Two clock sources external to the driver */ 121 LPC32XX_CLK_XTAL_32K, 122 LPC32XX_CLK_XTAL, 123 124 /* Renumbered USB clocks, may have a parent from SCB table */ 125 LPC32XX_CLK_USB_OFFSET, 126 LPC32XX_CLK_USB_I2C = LPC32XX_USB_CLK_I2C + LPC32XX_CLK_USB_OFFSET, 127 LPC32XX_CLK_USB_DEV = LPC32XX_USB_CLK_DEVICE + LPC32XX_CLK_USB_OFFSET, 128 LPC32XX_CLK_USB_HOST = LPC32XX_USB_CLK_HOST + LPC32XX_CLK_USB_OFFSET, 129 LPC32XX_CLK_USB_OTG = LPC32XX_USB_CLK_OTG + LPC32XX_CLK_USB_OFFSET, 130 LPC32XX_CLK_USB_AHB = LPC32XX_USB_CLK_AHB + LPC32XX_CLK_USB_OFFSET, 131 132 /* Stub for composite clocks */ 133 LPC32XX_CLK__NULL, 134 135 /* Subclocks of composite clocks, clocks above are for CCF */ 136 LPC32XX_CLK_PWM1_MUX, 137 LPC32XX_CLK_PWM1_DIV, 138 LPC32XX_CLK_PWM1_GATE, 139 LPC32XX_CLK_PWM2_MUX, 140 LPC32XX_CLK_PWM2_DIV, 141 LPC32XX_CLK_PWM2_GATE, 142 LPC32XX_CLK_UART3_MUX, 143 LPC32XX_CLK_UART3_DIV, 144 LPC32XX_CLK_UART3_GATE, 145 LPC32XX_CLK_UART4_MUX, 146 LPC32XX_CLK_UART4_DIV, 147 LPC32XX_CLK_UART4_GATE, 148 LPC32XX_CLK_UART5_MUX, 149 LPC32XX_CLK_UART5_DIV, 150 LPC32XX_CLK_UART5_GATE, 151 LPC32XX_CLK_UART6_MUX, 152 LPC32XX_CLK_UART6_DIV, 153 LPC32XX_CLK_UART6_GATE, 154 LPC32XX_CLK_TEST1_MUX, 155 LPC32XX_CLK_TEST1_GATE, 156 LPC32XX_CLK_TEST2_MUX, 157 LPC32XX_CLK_TEST2_GATE, 158 LPC32XX_CLK_USB_DIV_DIV, 159 LPC32XX_CLK_USB_DIV_GATE, 160 LPC32XX_CLK_SD_DIV, 161 LPC32XX_CLK_SD_GATE, 162 LPC32XX_CLK_LCD_DIV, 163 LPC32XX_CLK_LCD_GATE, 164 165 LPC32XX_CLK_HW_MAX, 166 LPC32XX_CLK_MAX = LPC32XX_CLK_SYSCLK_ARM_MUX + 1, 167 LPC32XX_CLK_CCF_MAX = LPC32XX_CLK_USB_AHB + 1, 168 }; 169 170 static struct clk *clk[LPC32XX_CLK_MAX]; 171 static struct clk_onecell_data clk_data = { 172 .clks = clk, 173 .clk_num = LPC32XX_CLK_MAX, 174 }; 175 176 static struct clk *usb_clk[LPC32XX_USB_CLK_MAX]; 177 static struct clk_onecell_data usb_clk_data = { 178 .clks = usb_clk, 179 .clk_num = LPC32XX_USB_CLK_MAX, 180 }; 181 182 #define LPC32XX_CLK_PARENTS_MAX 5 183 184 struct clk_proto_t { 185 const char *name; 186 const u8 parents[LPC32XX_CLK_PARENTS_MAX]; 187 u8 num_parents; 188 unsigned long flags; 189 }; 190 191 #define CLK_PREFIX(LITERAL) LPC32XX_CLK_ ## LITERAL 192 #define NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int)) 193 194 #define LPC32XX_CLK_DEFINE(_idx, _name, _flags, ...) \ 195 [CLK_PREFIX(_idx)] = { \ 196 .name = _name, \ 197 .flags = _flags, \ 198 .parents = { __VA_ARGS__ }, \ 199 .num_parents = NUMARGS(__VA_ARGS__), \ 200 } 201 202 static const struct clk_proto_t clk_proto[LPC32XX_CLK_CCF_MAX] __initconst = { 203 LPC32XX_CLK_DEFINE(XTAL, "xtal", 0x0), 204 LPC32XX_CLK_DEFINE(XTAL_32K, "xtal_32k", 0x0), 205 206 LPC32XX_CLK_DEFINE(RTC, "rtc", 0x0, LPC32XX_CLK_XTAL_32K), 207 LPC32XX_CLK_DEFINE(OSC, "osc", CLK_IGNORE_UNUSED, LPC32XX_CLK_XTAL), 208 LPC32XX_CLK_DEFINE(SYS, "sys", CLK_IGNORE_UNUSED, 209 LPC32XX_CLK_OSC, LPC32XX_CLK_PLL397X), 210 LPC32XX_CLK_DEFINE(PLL397X, "pll_397x", CLK_IGNORE_UNUSED, 211 LPC32XX_CLK_RTC), 212 LPC32XX_CLK_DEFINE(HCLK_PLL, "hclk_pll", CLK_IGNORE_UNUSED, 213 LPC32XX_CLK_SYS), 214 LPC32XX_CLK_DEFINE(HCLK_DIV_PERIPH, "hclk_div_periph", 215 CLK_IGNORE_UNUSED, LPC32XX_CLK_HCLK_PLL), 216 LPC32XX_CLK_DEFINE(HCLK_DIV, "hclk_div", CLK_IGNORE_UNUSED, 217 LPC32XX_CLK_HCLK_PLL), 218 LPC32XX_CLK_DEFINE(HCLK, "hclk", CLK_IGNORE_UNUSED, 219 LPC32XX_CLK_PERIPH_HCLK_MUX), 220 LPC32XX_CLK_DEFINE(PERIPH, "pclk", CLK_IGNORE_UNUSED, 221 LPC32XX_CLK_SYSCLK_PERIPH_MUX), 222 LPC32XX_CLK_DEFINE(ARM, "arm", CLK_IGNORE_UNUSED, 223 LPC32XX_CLK_PERIPH_ARM_MUX), 224 225 LPC32XX_CLK_DEFINE(PERIPH_HCLK_MUX, "periph_hclk_mux", 226 CLK_IGNORE_UNUSED, 227 LPC32XX_CLK_SYSCLK_HCLK_MUX, LPC32XX_CLK_SYSCLK_PERIPH_MUX), 228 LPC32XX_CLK_DEFINE(PERIPH_ARM_MUX, "periph_arm_mux", CLK_IGNORE_UNUSED, 229 LPC32XX_CLK_SYSCLK_ARM_MUX, LPC32XX_CLK_SYSCLK_PERIPH_MUX), 230 LPC32XX_CLK_DEFINE(SYSCLK_PERIPH_MUX, "sysclk_periph_mux", 231 CLK_IGNORE_UNUSED, 232 LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_DIV_PERIPH), 233 LPC32XX_CLK_DEFINE(SYSCLK_HCLK_MUX, "sysclk_hclk_mux", 234 CLK_IGNORE_UNUSED, 235 LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_DIV), 236 LPC32XX_CLK_DEFINE(SYSCLK_ARM_MUX, "sysclk_arm_mux", CLK_IGNORE_UNUSED, 237 LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_PLL), 238 239 LPC32XX_CLK_DEFINE(ARM_VFP, "vfp9", CLK_IGNORE_UNUSED, 240 LPC32XX_CLK_ARM), 241 LPC32XX_CLK_DEFINE(USB_PLL, "usb_pll", 242 CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT, LPC32XX_CLK_USB_DIV), 243 LPC32XX_CLK_DEFINE(USB_DIV, "usb_div", 0x0, LPC32XX_CLK_OSC), 244 LPC32XX_CLK_DEFINE(USB, "usb", 0x0, LPC32XX_CLK_USB_PLL), 245 LPC32XX_CLK_DEFINE(DMA, "dma", 0x0, LPC32XX_CLK_HCLK), 246 LPC32XX_CLK_DEFINE(MLC, "mlc", 0x0, LPC32XX_CLK_HCLK), 247 LPC32XX_CLK_DEFINE(SLC, "slc", 0x0, LPC32XX_CLK_HCLK), 248 LPC32XX_CLK_DEFINE(LCD, "lcd", 0x0, LPC32XX_CLK_HCLK), 249 LPC32XX_CLK_DEFINE(MAC, "mac", 0x0, LPC32XX_CLK_HCLK), 250 LPC32XX_CLK_DEFINE(SD, "sd", 0x0, LPC32XX_CLK_ARM), 251 LPC32XX_CLK_DEFINE(DDRAM, "ddram", CLK_GET_RATE_NOCACHE, 252 LPC32XX_CLK_SYSCLK_ARM_MUX), 253 LPC32XX_CLK_DEFINE(SSP0, "ssp0", 0x0, LPC32XX_CLK_HCLK), 254 LPC32XX_CLK_DEFINE(SSP1, "ssp1", 0x0, LPC32XX_CLK_HCLK), 255 256 /* 257 * CLK_GET_RATE_NOCACHE is needed, if UART clock is disabled, its 258 * divider register does not contain information about selected rate. 259 */ 260 LPC32XX_CLK_DEFINE(UART3, "uart3", CLK_GET_RATE_NOCACHE, 261 LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK), 262 LPC32XX_CLK_DEFINE(UART4, "uart4", CLK_GET_RATE_NOCACHE, 263 LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK), 264 LPC32XX_CLK_DEFINE(UART5, "uart5", CLK_GET_RATE_NOCACHE, 265 LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK), 266 LPC32XX_CLK_DEFINE(UART6, "uart6", CLK_GET_RATE_NOCACHE, 267 LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK), 268 LPC32XX_CLK_DEFINE(IRDA, "irda", 0x0, LPC32XX_CLK_PERIPH), 269 LPC32XX_CLK_DEFINE(I2C1, "i2c1", 0x0, LPC32XX_CLK_HCLK), 270 LPC32XX_CLK_DEFINE(I2C2, "i2c2", 0x0, LPC32XX_CLK_HCLK), 271 LPC32XX_CLK_DEFINE(TIMER0, "timer0", 0x0, LPC32XX_CLK_PERIPH), 272 LPC32XX_CLK_DEFINE(TIMER1, "timer1", 0x0, LPC32XX_CLK_PERIPH), 273 LPC32XX_CLK_DEFINE(TIMER2, "timer2", 0x0, LPC32XX_CLK_PERIPH), 274 LPC32XX_CLK_DEFINE(TIMER3, "timer3", 0x0, LPC32XX_CLK_PERIPH), 275 LPC32XX_CLK_DEFINE(TIMER4, "timer4", 0x0, LPC32XX_CLK_PERIPH), 276 LPC32XX_CLK_DEFINE(TIMER5, "timer5", 0x0, LPC32XX_CLK_PERIPH), 277 LPC32XX_CLK_DEFINE(WDOG, "watchdog", 0x0, LPC32XX_CLK_PERIPH), 278 LPC32XX_CLK_DEFINE(I2S0, "i2s0", 0x0, LPC32XX_CLK_HCLK), 279 LPC32XX_CLK_DEFINE(I2S1, "i2s1", 0x0, LPC32XX_CLK_HCLK), 280 LPC32XX_CLK_DEFINE(SPI1, "spi1", 0x0, LPC32XX_CLK_HCLK), 281 LPC32XX_CLK_DEFINE(SPI2, "spi2", 0x0, LPC32XX_CLK_HCLK), 282 LPC32XX_CLK_DEFINE(MCPWM, "mcpwm", 0x0, LPC32XX_CLK_HCLK), 283 LPC32XX_CLK_DEFINE(HSTIMER, "hstimer", 0x0, LPC32XX_CLK_PERIPH), 284 LPC32XX_CLK_DEFINE(KEY, "key", 0x0, LPC32XX_CLK_RTC), 285 LPC32XX_CLK_DEFINE(PWM1, "pwm1", 0x0, 286 LPC32XX_CLK_RTC, LPC32XX_CLK_PERIPH), 287 LPC32XX_CLK_DEFINE(PWM2, "pwm2", 0x0, 288 LPC32XX_CLK_RTC, LPC32XX_CLK_PERIPH), 289 LPC32XX_CLK_DEFINE(ADC, "adc", 0x0, 290 LPC32XX_CLK_ADC_RTC, LPC32XX_CLK_ADC_DIV), 291 LPC32XX_CLK_DEFINE(ADC_DIV, "adc_div", 0x0, LPC32XX_CLK_PERIPH), 292 LPC32XX_CLK_DEFINE(ADC_RTC, "adc_rtc", 0x0, LPC32XX_CLK_RTC), 293 LPC32XX_CLK_DEFINE(TEST1, "test1", 0x0, 294 LPC32XX_CLK_PERIPH, LPC32XX_CLK_RTC, LPC32XX_CLK_OSC), 295 LPC32XX_CLK_DEFINE(TEST2, "test2", 0x0, 296 LPC32XX_CLK_HCLK, LPC32XX_CLK_PERIPH, LPC32XX_CLK_USB, 297 LPC32XX_CLK_OSC, LPC32XX_CLK_PLL397X), 298 299 /* USB controller clocks */ 300 LPC32XX_CLK_DEFINE(USB_AHB, "usb_ahb", 0x0, LPC32XX_CLK_USB), 301 LPC32XX_CLK_DEFINE(USB_OTG, "usb_otg", 0x0, LPC32XX_CLK_USB_AHB), 302 LPC32XX_CLK_DEFINE(USB_I2C, "usb_i2c", 0x0, LPC32XX_CLK_USB_AHB), 303 LPC32XX_CLK_DEFINE(USB_DEV, "usb_dev", 0x0, LPC32XX_CLK_USB_OTG), 304 LPC32XX_CLK_DEFINE(USB_HOST, "usb_host", 0x0, LPC32XX_CLK_USB_OTG), 305 }; 306 307 struct lpc32xx_clk { 308 struct clk_hw hw; 309 u32 reg; 310 u32 enable; 311 u32 enable_mask; 312 u32 disable; 313 u32 disable_mask; 314 u32 busy; 315 u32 busy_mask; 316 }; 317 318 enum clk_pll_mode { 319 PLL_UNKNOWN, 320 PLL_DIRECT, 321 PLL_BYPASS, 322 PLL_DIRECT_BYPASS, 323 PLL_INTEGER, 324 PLL_NON_INTEGER, 325 }; 326 327 struct lpc32xx_pll_clk { 328 struct clk_hw hw; 329 u32 reg; 330 u32 enable; 331 unsigned long m_div; 332 unsigned long n_div; 333 unsigned long p_div; 334 enum clk_pll_mode mode; 335 }; 336 337 struct lpc32xx_usb_clk { 338 struct clk_hw hw; 339 u32 ctrl_enable; 340 u32 ctrl_disable; 341 u32 ctrl_mask; 342 u32 enable; 343 u32 busy; 344 }; 345 346 struct lpc32xx_clk_mux { 347 struct clk_hw hw; 348 u32 reg; 349 u32 mask; 350 u8 shift; 351 u32 *table; 352 u8 flags; 353 }; 354 355 struct lpc32xx_clk_div { 356 struct clk_hw hw; 357 u32 reg; 358 u8 shift; 359 u8 width; 360 const struct clk_div_table *table; 361 u8 flags; 362 }; 363 364 struct lpc32xx_clk_gate { 365 struct clk_hw hw; 366 u32 reg; 367 u8 bit_idx; 368 u8 flags; 369 }; 370 371 #define to_lpc32xx_clk(_hw) container_of(_hw, struct lpc32xx_clk, hw) 372 #define to_lpc32xx_pll_clk(_hw) container_of(_hw, struct lpc32xx_pll_clk, hw) 373 #define to_lpc32xx_usb_clk(_hw) container_of(_hw, struct lpc32xx_usb_clk, hw) 374 #define to_lpc32xx_mux(_hw) container_of(_hw, struct lpc32xx_clk_mux, hw) 375 #define to_lpc32xx_div(_hw) container_of(_hw, struct lpc32xx_clk_div, hw) 376 #define to_lpc32xx_gate(_hw) container_of(_hw, struct lpc32xx_clk_gate, hw) 377 378 static inline bool pll_is_valid(u64 val0, u64 val1, u64 min, u64 max) 379 { 380 return (val0 >= (val1 * min) && val0 <= (val1 * max)); 381 } 382 383 static inline u32 lpc32xx_usb_clk_read(struct lpc32xx_usb_clk *clk) 384 { 385 return readl(usb_clk_vbase + LPC32XX_USB_CLK_STS); 386 } 387 388 static inline void lpc32xx_usb_clk_write(struct lpc32xx_usb_clk *clk, u32 val) 389 { 390 writel(val, usb_clk_vbase + LPC32XX_USB_CLK_CTRL); 391 } 392 393 static int clk_mask_enable(struct clk_hw *hw) 394 { 395 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 396 u32 val; 397 398 regmap_read(clk_regmap, clk->reg, &val); 399 400 if (clk->busy_mask && (val & clk->busy_mask) == clk->busy) 401 return -EBUSY; 402 403 return regmap_update_bits(clk_regmap, clk->reg, 404 clk->enable_mask, clk->enable); 405 } 406 407 static void clk_mask_disable(struct clk_hw *hw) 408 { 409 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 410 411 regmap_update_bits(clk_regmap, clk->reg, 412 clk->disable_mask, clk->disable); 413 } 414 415 static int clk_mask_is_enabled(struct clk_hw *hw) 416 { 417 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 418 u32 val; 419 420 regmap_read(clk_regmap, clk->reg, &val); 421 422 return ((val & clk->enable_mask) == clk->enable); 423 } 424 425 static const struct clk_ops clk_mask_ops = { 426 .enable = clk_mask_enable, 427 .disable = clk_mask_disable, 428 .is_enabled = clk_mask_is_enabled, 429 }; 430 431 static int clk_pll_enable(struct clk_hw *hw) 432 { 433 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 434 u32 val, count; 435 436 regmap_update_bits(clk_regmap, clk->reg, clk->enable, clk->enable); 437 438 for (count = 0; count < 1000; count++) { 439 regmap_read(clk_regmap, clk->reg, &val); 440 if (val & PLL_CTRL_LOCK) 441 break; 442 } 443 444 if (val & PLL_CTRL_LOCK) 445 return 0; 446 447 return -ETIMEDOUT; 448 } 449 450 static void clk_pll_disable(struct clk_hw *hw) 451 { 452 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 453 454 regmap_update_bits(clk_regmap, clk->reg, clk->enable, 0x0); 455 } 456 457 static int clk_pll_is_enabled(struct clk_hw *hw) 458 { 459 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 460 u32 val; 461 462 regmap_read(clk_regmap, clk->reg, &val); 463 464 val &= clk->enable | PLL_CTRL_LOCK; 465 if (val == (clk->enable | PLL_CTRL_LOCK)) 466 return 1; 467 468 return 0; 469 } 470 471 static unsigned long clk_pll_397x_recalc_rate(struct clk_hw *hw, 472 unsigned long parent_rate) 473 { 474 return parent_rate * 397; 475 } 476 477 static unsigned long clk_pll_recalc_rate(struct clk_hw *hw, 478 unsigned long parent_rate) 479 { 480 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 481 bool is_direct, is_bypass, is_feedback; 482 unsigned long rate, cco_rate, ref_rate; 483 u32 val; 484 485 regmap_read(clk_regmap, clk->reg, &val); 486 is_direct = val & PLL_CTRL_DIRECT; 487 is_bypass = val & PLL_CTRL_BYPASS; 488 is_feedback = val & PLL_CTRL_FEEDBACK; 489 490 clk->m_div = ((val & PLL_CTRL_FEEDDIV) >> 1) + 1; 491 clk->n_div = ((val & PLL_CTRL_PREDIV) >> 9) + 1; 492 clk->p_div = ((val & PLL_CTRL_POSTDIV) >> 11) + 1; 493 494 if (is_direct && is_bypass) { 495 clk->p_div = 0; 496 clk->mode = PLL_DIRECT_BYPASS; 497 return parent_rate; 498 } 499 if (is_bypass) { 500 clk->mode = PLL_BYPASS; 501 return parent_rate / (1 << clk->p_div); 502 } 503 if (is_direct) { 504 clk->p_div = 0; 505 clk->mode = PLL_DIRECT; 506 } 507 508 ref_rate = parent_rate / clk->n_div; 509 rate = cco_rate = ref_rate * clk->m_div; 510 511 if (!is_direct) { 512 if (is_feedback) { 513 cco_rate *= (1 << clk->p_div); 514 clk->mode = PLL_INTEGER; 515 } else { 516 rate /= (1 << clk->p_div); 517 clk->mode = PLL_NON_INTEGER; 518 } 519 } 520 521 pr_debug("%s: %lu: 0x%x: %d/%d/%d, %lu/%lu/%d => %lu\n", 522 clk_hw_get_name(hw), 523 parent_rate, val, is_direct, is_bypass, is_feedback, 524 clk->n_div, clk->m_div, (1 << clk->p_div), rate); 525 526 if (clk_pll_is_enabled(hw) && 527 !(pll_is_valid(parent_rate, 1, 1000000, 20000000) 528 && pll_is_valid(cco_rate, 1, 156000000, 320000000) 529 && pll_is_valid(ref_rate, 1, 1000000, 27000000))) 530 pr_err("%s: PLL clocks are not in valid ranges: %lu/%lu/%lu\n", 531 clk_hw_get_name(hw), 532 parent_rate, cco_rate, ref_rate); 533 534 return rate; 535 } 536 537 static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate, 538 unsigned long parent_rate) 539 { 540 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 541 u32 val; 542 unsigned long new_rate; 543 544 /* Validate PLL clock parameters computed on round rate stage */ 545 switch (clk->mode) { 546 case PLL_DIRECT: 547 val = PLL_CTRL_DIRECT; 548 val |= (clk->m_div - 1) << 1; 549 val |= (clk->n_div - 1) << 9; 550 new_rate = (parent_rate * clk->m_div) / clk->n_div; 551 break; 552 case PLL_BYPASS: 553 val = PLL_CTRL_BYPASS; 554 val |= (clk->p_div - 1) << 11; 555 new_rate = parent_rate / (1 << (clk->p_div)); 556 break; 557 case PLL_DIRECT_BYPASS: 558 val = PLL_CTRL_DIRECT | PLL_CTRL_BYPASS; 559 new_rate = parent_rate; 560 break; 561 case PLL_INTEGER: 562 val = PLL_CTRL_FEEDBACK; 563 val |= (clk->m_div - 1) << 1; 564 val |= (clk->n_div - 1) << 9; 565 val |= (clk->p_div - 1) << 11; 566 new_rate = (parent_rate * clk->m_div) / clk->n_div; 567 break; 568 case PLL_NON_INTEGER: 569 val = 0x0; 570 val |= (clk->m_div - 1) << 1; 571 val |= (clk->n_div - 1) << 9; 572 val |= (clk->p_div - 1) << 11; 573 new_rate = (parent_rate * clk->m_div) / 574 (clk->n_div * (1 << clk->p_div)); 575 break; 576 default: 577 return -EINVAL; 578 } 579 580 /* Sanity check that round rate is equal to the requested one */ 581 if (new_rate != rate) 582 return -EINVAL; 583 584 return regmap_update_bits(clk_regmap, clk->reg, 0x1FFFF, val); 585 } 586 587 static long clk_hclk_pll_round_rate(struct clk_hw *hw, unsigned long rate, 588 unsigned long *parent_rate) 589 { 590 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 591 u64 m_i, o = rate, i = *parent_rate, d = (u64)rate << 6; 592 u64 m = 0, n = 0, p = 0; 593 int p_i, n_i; 594 595 pr_debug("%s: %lu/%lu\n", clk_hw_get_name(hw), *parent_rate, rate); 596 597 if (rate > 266500000) 598 return -EINVAL; 599 600 /* Have to check all 20 possibilities to find the minimal M */ 601 for (p_i = 4; p_i >= 0; p_i--) { 602 for (n_i = 4; n_i > 0; n_i--) { 603 m_i = div64_u64(o * n_i * (1 << p_i), i); 604 605 /* Check for valid PLL parameter constraints */ 606 if (!(m_i && m_i <= 256 607 && pll_is_valid(i, n_i, 1000000, 27000000) 608 && pll_is_valid(i * m_i * (1 << p_i), n_i, 609 156000000, 320000000))) 610 continue; 611 612 /* Store some intermediate valid parameters */ 613 if (o * n_i * (1 << p_i) - i * m_i <= d) { 614 m = m_i; 615 n = n_i; 616 p = p_i; 617 d = o * n_i * (1 << p_i) - i * m_i; 618 } 619 } 620 } 621 622 if (d == (u64)rate << 6) { 623 pr_err("%s: %lu: no valid PLL parameters are found\n", 624 clk_hw_get_name(hw), rate); 625 return -EINVAL; 626 } 627 628 clk->m_div = m; 629 clk->n_div = n; 630 clk->p_div = p; 631 632 /* Set only direct or non-integer mode of PLL */ 633 if (!p) 634 clk->mode = PLL_DIRECT; 635 else 636 clk->mode = PLL_NON_INTEGER; 637 638 o = div64_u64(i * m, n * (1 << p)); 639 640 if (!d) 641 pr_debug("%s: %lu: found exact match: %llu/%llu/%llu\n", 642 clk_hw_get_name(hw), rate, m, n, p); 643 else 644 pr_debug("%s: %lu: found closest: %llu/%llu/%llu - %llu\n", 645 clk_hw_get_name(hw), rate, m, n, p, o); 646 647 return o; 648 } 649 650 static long clk_usb_pll_round_rate(struct clk_hw *hw, unsigned long rate, 651 unsigned long *parent_rate) 652 { 653 struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw); 654 struct clk_hw *usb_div_hw, *osc_hw; 655 u64 d_i, n_i, m, o; 656 657 pr_debug("%s: %lu/%lu\n", clk_hw_get_name(hw), *parent_rate, rate); 658 659 /* 660 * The only supported USB clock is 48MHz, with PLL internal constraints 661 * on Fclkin, Fcco and Fref this implies that Fcco must be 192MHz 662 * and post-divider must be 4, this slightly simplifies calculation of 663 * USB divider, USB PLL N and M parameters. 664 */ 665 if (rate != 48000000) 666 return -EINVAL; 667 668 /* USB divider clock */ 669 usb_div_hw = clk_hw_get_parent_by_index(hw, 0); 670 if (!usb_div_hw) 671 return -EINVAL; 672 673 /* Main oscillator clock */ 674 osc_hw = clk_hw_get_parent_by_index(usb_div_hw, 0); 675 if (!osc_hw) 676 return -EINVAL; 677 o = clk_hw_get_rate(osc_hw); /* must be in range 1..20 MHz */ 678 679 /* Check if valid USB divider and USB PLL parameters exists */ 680 for (d_i = 16; d_i >= 1; d_i--) { 681 for (n_i = 1; n_i <= 4; n_i++) { 682 m = div64_u64(192000000 * d_i * n_i, o); 683 if (!(m && m <= 256 684 && m * o == 192000000 * d_i * n_i 685 && pll_is_valid(o, d_i, 1000000, 20000000) 686 && pll_is_valid(o, d_i * n_i, 1000000, 27000000))) 687 continue; 688 689 clk->n_div = n_i; 690 clk->m_div = m; 691 clk->p_div = 2; 692 clk->mode = PLL_NON_INTEGER; 693 *parent_rate = div64_u64(o, d_i); 694 695 return rate; 696 } 697 } 698 699 return -EINVAL; 700 } 701 702 #define LPC32XX_DEFINE_PLL_OPS(_name, _rc, _sr, _rr) \ 703 static const struct clk_ops clk_ ##_name ## _ops = { \ 704 .enable = clk_pll_enable, \ 705 .disable = clk_pll_disable, \ 706 .is_enabled = clk_pll_is_enabled, \ 707 .recalc_rate = _rc, \ 708 .set_rate = _sr, \ 709 .round_rate = _rr, \ 710 } 711 712 LPC32XX_DEFINE_PLL_OPS(pll_397x, clk_pll_397x_recalc_rate, NULL, NULL); 713 LPC32XX_DEFINE_PLL_OPS(hclk_pll, clk_pll_recalc_rate, 714 clk_pll_set_rate, clk_hclk_pll_round_rate); 715 LPC32XX_DEFINE_PLL_OPS(usb_pll, clk_pll_recalc_rate, 716 clk_pll_set_rate, clk_usb_pll_round_rate); 717 718 static int clk_ddram_is_enabled(struct clk_hw *hw) 719 { 720 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 721 u32 val; 722 723 regmap_read(clk_regmap, clk->reg, &val); 724 val &= clk->enable_mask | clk->busy_mask; 725 726 return (val == (BIT(7) | BIT(0)) || 727 val == (BIT(8) | BIT(1))); 728 } 729 730 static int clk_ddram_enable(struct clk_hw *hw) 731 { 732 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 733 u32 val, hclk_div; 734 735 regmap_read(clk_regmap, clk->reg, &val); 736 hclk_div = val & clk->busy_mask; 737 738 /* 739 * DDRAM clock must be 2 times higher than HCLK, 740 * this implies DDRAM clock can not be enabled, 741 * if HCLK clock rate is equal to ARM clock rate 742 */ 743 if (hclk_div == 0x0 || hclk_div == (BIT(1) | BIT(0))) 744 return -EINVAL; 745 746 return regmap_update_bits(clk_regmap, clk->reg, 747 clk->enable_mask, hclk_div << 7); 748 } 749 750 static unsigned long clk_ddram_recalc_rate(struct clk_hw *hw, 751 unsigned long parent_rate) 752 { 753 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 754 u32 val; 755 756 if (!clk_ddram_is_enabled(hw)) 757 return 0; 758 759 regmap_read(clk_regmap, clk->reg, &val); 760 val &= clk->enable_mask; 761 762 return parent_rate / (val >> 7); 763 } 764 765 static const struct clk_ops clk_ddram_ops = { 766 .enable = clk_ddram_enable, 767 .disable = clk_mask_disable, 768 .is_enabled = clk_ddram_is_enabled, 769 .recalc_rate = clk_ddram_recalc_rate, 770 }; 771 772 static unsigned long lpc32xx_clk_uart_recalc_rate(struct clk_hw *hw, 773 unsigned long parent_rate) 774 { 775 struct lpc32xx_clk *clk = to_lpc32xx_clk(hw); 776 u32 val, x, y; 777 778 regmap_read(clk_regmap, clk->reg, &val); 779 x = (val & 0xFF00) >> 8; 780 y = val & 0xFF; 781 782 if (x && y) 783 return (parent_rate * x) / y; 784 else 785 return 0; 786 } 787 788 static const struct clk_ops lpc32xx_uart_div_ops = { 789 .recalc_rate = lpc32xx_clk_uart_recalc_rate, 790 }; 791 792 static const struct clk_div_table clk_hclk_div_table[] = { 793 { .val = 0, .div = 1 }, 794 { .val = 1, .div = 2 }, 795 { .val = 2, .div = 4 }, 796 { }, 797 }; 798 799 static u32 test1_mux_table[] = { 0, 1, 2, }; 800 static u32 test2_mux_table[] = { 0, 1, 2, 5, 7, }; 801 802 static int clk_usb_enable(struct clk_hw *hw) 803 { 804 struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw); 805 u32 val, ctrl_val, count; 806 807 pr_debug("%s: 0x%x\n", clk_hw_get_name(hw), clk->enable); 808 809 if (clk->ctrl_mask) { 810 regmap_read(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, &ctrl_val); 811 regmap_update_bits(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, 812 clk->ctrl_mask, clk->ctrl_enable); 813 } 814 815 val = lpc32xx_usb_clk_read(clk); 816 if (clk->busy && (val & clk->busy) == clk->busy) { 817 if (clk->ctrl_mask) 818 regmap_write(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, 819 ctrl_val); 820 return -EBUSY; 821 } 822 823 val |= clk->enable; 824 lpc32xx_usb_clk_write(clk, val); 825 826 for (count = 0; count < 1000; count++) { 827 val = lpc32xx_usb_clk_read(clk); 828 if ((val & clk->enable) == clk->enable) 829 break; 830 } 831 832 if ((val & clk->enable) == clk->enable) 833 return 0; 834 835 if (clk->ctrl_mask) 836 regmap_write(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, ctrl_val); 837 838 return -ETIMEDOUT; 839 } 840 841 static void clk_usb_disable(struct clk_hw *hw) 842 { 843 struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw); 844 u32 val = lpc32xx_usb_clk_read(clk); 845 846 val &= ~clk->enable; 847 lpc32xx_usb_clk_write(clk, val); 848 849 if (clk->ctrl_mask) 850 regmap_update_bits(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, 851 clk->ctrl_mask, clk->ctrl_disable); 852 } 853 854 static int clk_usb_is_enabled(struct clk_hw *hw) 855 { 856 struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw); 857 u32 ctrl_val, val; 858 859 if (clk->ctrl_mask) { 860 regmap_read(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, &ctrl_val); 861 if ((ctrl_val & clk->ctrl_mask) != clk->ctrl_enable) 862 return 0; 863 } 864 865 val = lpc32xx_usb_clk_read(clk); 866 867 return ((val & clk->enable) == clk->enable); 868 } 869 870 static unsigned long clk_usb_i2c_recalc_rate(struct clk_hw *hw, 871 unsigned long parent_rate) 872 { 873 return clk_get_rate(clk[LPC32XX_CLK_PERIPH]); 874 } 875 876 static const struct clk_ops clk_usb_ops = { 877 .enable = clk_usb_enable, 878 .disable = clk_usb_disable, 879 .is_enabled = clk_usb_is_enabled, 880 }; 881 882 static const struct clk_ops clk_usb_i2c_ops = { 883 .enable = clk_usb_enable, 884 .disable = clk_usb_disable, 885 .is_enabled = clk_usb_is_enabled, 886 .recalc_rate = clk_usb_i2c_recalc_rate, 887 }; 888 889 static int lpc32xx_clk_gate_enable(struct clk_hw *hw) 890 { 891 struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw); 892 u32 mask = BIT(clk->bit_idx); 893 u32 val = (clk->flags & CLK_GATE_SET_TO_DISABLE ? 0x0 : mask); 894 895 return regmap_update_bits(clk_regmap, clk->reg, mask, val); 896 } 897 898 static void lpc32xx_clk_gate_disable(struct clk_hw *hw) 899 { 900 struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw); 901 u32 mask = BIT(clk->bit_idx); 902 u32 val = (clk->flags & CLK_GATE_SET_TO_DISABLE ? mask : 0x0); 903 904 regmap_update_bits(clk_regmap, clk->reg, mask, val); 905 } 906 907 static int lpc32xx_clk_gate_is_enabled(struct clk_hw *hw) 908 { 909 struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw); 910 u32 val; 911 bool is_set; 912 913 regmap_read(clk_regmap, clk->reg, &val); 914 is_set = val & BIT(clk->bit_idx); 915 916 return (clk->flags & CLK_GATE_SET_TO_DISABLE ? !is_set : is_set); 917 } 918 919 static const struct clk_ops lpc32xx_clk_gate_ops = { 920 .enable = lpc32xx_clk_gate_enable, 921 .disable = lpc32xx_clk_gate_disable, 922 .is_enabled = lpc32xx_clk_gate_is_enabled, 923 }; 924 925 #define div_mask(width) ((1 << (width)) - 1) 926 927 static unsigned int _get_table_div(const struct clk_div_table *table, 928 unsigned int val) 929 { 930 const struct clk_div_table *clkt; 931 932 for (clkt = table; clkt->div; clkt++) 933 if (clkt->val == val) 934 return clkt->div; 935 return 0; 936 } 937 938 static unsigned int _get_div(const struct clk_div_table *table, 939 unsigned int val, unsigned long flags, u8 width) 940 { 941 if (flags & CLK_DIVIDER_ONE_BASED) 942 return val; 943 if (table) 944 return _get_table_div(table, val); 945 return val + 1; 946 } 947 948 static unsigned long clk_divider_recalc_rate(struct clk_hw *hw, 949 unsigned long parent_rate) 950 { 951 struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw); 952 unsigned int val; 953 954 regmap_read(clk_regmap, divider->reg, &val); 955 956 val >>= divider->shift; 957 val &= div_mask(divider->width); 958 959 return divider_recalc_rate(hw, parent_rate, val, divider->table, 960 divider->flags, divider->width); 961 } 962 963 static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate, 964 unsigned long *prate) 965 { 966 struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw); 967 unsigned int bestdiv; 968 969 /* if read only, just return current value */ 970 if (divider->flags & CLK_DIVIDER_READ_ONLY) { 971 regmap_read(clk_regmap, divider->reg, &bestdiv); 972 bestdiv >>= divider->shift; 973 bestdiv &= div_mask(divider->width); 974 bestdiv = _get_div(divider->table, bestdiv, divider->flags, 975 divider->width); 976 return DIV_ROUND_UP(*prate, bestdiv); 977 } 978 979 return divider_round_rate(hw, rate, prate, divider->table, 980 divider->width, divider->flags); 981 } 982 983 static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate, 984 unsigned long parent_rate) 985 { 986 struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw); 987 unsigned int value; 988 989 value = divider_get_val(rate, parent_rate, divider->table, 990 divider->width, divider->flags); 991 992 return regmap_update_bits(clk_regmap, divider->reg, 993 div_mask(divider->width) << divider->shift, 994 value << divider->shift); 995 } 996 997 static const struct clk_ops lpc32xx_clk_divider_ops = { 998 .recalc_rate = clk_divider_recalc_rate, 999 .round_rate = clk_divider_round_rate, 1000 .set_rate = clk_divider_set_rate, 1001 }; 1002 1003 static u8 clk_mux_get_parent(struct clk_hw *hw) 1004 { 1005 struct lpc32xx_clk_mux *mux = to_lpc32xx_mux(hw); 1006 u32 num_parents = clk_hw_get_num_parents(hw); 1007 u32 val; 1008 1009 regmap_read(clk_regmap, mux->reg, &val); 1010 val >>= mux->shift; 1011 val &= mux->mask; 1012 1013 if (mux->table) { 1014 u32 i; 1015 1016 for (i = 0; i < num_parents; i++) 1017 if (mux->table[i] == val) 1018 return i; 1019 return -EINVAL; 1020 } 1021 1022 if (val >= num_parents) 1023 return -EINVAL; 1024 1025 return val; 1026 } 1027 1028 static int clk_mux_set_parent(struct clk_hw *hw, u8 index) 1029 { 1030 struct lpc32xx_clk_mux *mux = to_lpc32xx_mux(hw); 1031 1032 if (mux->table) 1033 index = mux->table[index]; 1034 1035 return regmap_update_bits(clk_regmap, mux->reg, 1036 mux->mask << mux->shift, index << mux->shift); 1037 } 1038 1039 static const struct clk_ops lpc32xx_clk_mux_ro_ops = { 1040 .get_parent = clk_mux_get_parent, 1041 }; 1042 1043 static const struct clk_ops lpc32xx_clk_mux_ops = { 1044 .get_parent = clk_mux_get_parent, 1045 .set_parent = clk_mux_set_parent, 1046 .determine_rate = __clk_mux_determine_rate, 1047 }; 1048 1049 enum lpc32xx_clk_type { 1050 CLK_FIXED, 1051 CLK_MUX, 1052 CLK_DIV, 1053 CLK_GATE, 1054 CLK_COMPOSITE, 1055 CLK_LPC32XX, 1056 CLK_LPC32XX_PLL, 1057 CLK_LPC32XX_USB, 1058 }; 1059 1060 struct clk_hw_proto0 { 1061 const struct clk_ops *ops; 1062 union { 1063 struct lpc32xx_pll_clk pll; 1064 struct lpc32xx_clk clk; 1065 struct lpc32xx_usb_clk usb_clk; 1066 struct lpc32xx_clk_mux mux; 1067 struct lpc32xx_clk_div div; 1068 struct lpc32xx_clk_gate gate; 1069 }; 1070 }; 1071 1072 struct clk_hw_proto1 { 1073 struct clk_hw_proto0 *mux; 1074 struct clk_hw_proto0 *div; 1075 struct clk_hw_proto0 *gate; 1076 }; 1077 1078 struct clk_hw_proto { 1079 enum lpc32xx_clk_type type; 1080 1081 union { 1082 struct clk_fixed_rate f; 1083 struct clk_hw_proto0 hw0; 1084 struct clk_hw_proto1 hw1; 1085 }; 1086 }; 1087 1088 #define LPC32XX_DEFINE_FIXED(_idx, _rate) \ 1089 [CLK_PREFIX(_idx)] = { \ 1090 .type = CLK_FIXED, \ 1091 { \ 1092 .f = { \ 1093 .fixed_rate = (_rate), \ 1094 }, \ 1095 }, \ 1096 } 1097 1098 #define LPC32XX_DEFINE_PLL(_idx, _name, _reg, _enable) \ 1099 [CLK_PREFIX(_idx)] = { \ 1100 .type = CLK_LPC32XX_PLL, \ 1101 { \ 1102 .hw0 = { \ 1103 .ops = &clk_ ##_name ## _ops, \ 1104 { \ 1105 .pll = { \ 1106 .reg = LPC32XX_CLKPWR_ ## _reg, \ 1107 .enable = (_enable), \ 1108 }, \ 1109 }, \ 1110 }, \ 1111 }, \ 1112 } 1113 1114 #define LPC32XX_DEFINE_MUX(_idx, _reg, _shift, _mask, _table, _flags) \ 1115 [CLK_PREFIX(_idx)] = { \ 1116 .type = CLK_MUX, \ 1117 { \ 1118 .hw0 = { \ 1119 .ops = (_flags & CLK_MUX_READ_ONLY ? \ 1120 &lpc32xx_clk_mux_ro_ops : \ 1121 &lpc32xx_clk_mux_ops), \ 1122 { \ 1123 .mux = { \ 1124 .reg = LPC32XX_CLKPWR_ ## _reg, \ 1125 .mask = (_mask), \ 1126 .shift = (_shift), \ 1127 .table = (_table), \ 1128 .flags = (_flags), \ 1129 }, \ 1130 }, \ 1131 }, \ 1132 }, \ 1133 } 1134 1135 #define LPC32XX_DEFINE_DIV(_idx, _reg, _shift, _width, _table, _flags) \ 1136 [CLK_PREFIX(_idx)] = { \ 1137 .type = CLK_DIV, \ 1138 { \ 1139 .hw0 = { \ 1140 .ops = &lpc32xx_clk_divider_ops, \ 1141 { \ 1142 .div = { \ 1143 .reg = LPC32XX_CLKPWR_ ## _reg, \ 1144 .shift = (_shift), \ 1145 .width = (_width), \ 1146 .table = (_table), \ 1147 .flags = (_flags), \ 1148 }, \ 1149 }, \ 1150 }, \ 1151 }, \ 1152 } 1153 1154 #define LPC32XX_DEFINE_GATE(_idx, _reg, _bit, _flags) \ 1155 [CLK_PREFIX(_idx)] = { \ 1156 .type = CLK_GATE, \ 1157 { \ 1158 .hw0 = { \ 1159 .ops = &lpc32xx_clk_gate_ops, \ 1160 { \ 1161 .gate = { \ 1162 .reg = LPC32XX_CLKPWR_ ## _reg, \ 1163 .bit_idx = (_bit), \ 1164 .flags = (_flags), \ 1165 }, \ 1166 }, \ 1167 }, \ 1168 }, \ 1169 } 1170 1171 #define LPC32XX_DEFINE_CLK(_idx, _reg, _e, _em, _d, _dm, _b, _bm, _ops) \ 1172 [CLK_PREFIX(_idx)] = { \ 1173 .type = CLK_LPC32XX, \ 1174 { \ 1175 .hw0 = { \ 1176 .ops = &(_ops), \ 1177 { \ 1178 .clk = { \ 1179 .reg = LPC32XX_CLKPWR_ ## _reg, \ 1180 .enable = (_e), \ 1181 .enable_mask = (_em), \ 1182 .disable = (_d), \ 1183 .disable_mask = (_dm), \ 1184 .busy = (_b), \ 1185 .busy_mask = (_bm), \ 1186 }, \ 1187 }, \ 1188 }, \ 1189 }, \ 1190 } 1191 1192 #define LPC32XX_DEFINE_USB(_idx, _ce, _cd, _cm, _e, _b, _ops) \ 1193 [CLK_PREFIX(_idx)] = { \ 1194 .type = CLK_LPC32XX_USB, \ 1195 { \ 1196 .hw0 = { \ 1197 .ops = &(_ops), \ 1198 { \ 1199 .usb_clk = { \ 1200 .ctrl_enable = (_ce), \ 1201 .ctrl_disable = (_cd), \ 1202 .ctrl_mask = (_cm), \ 1203 .enable = (_e), \ 1204 .busy = (_b), \ 1205 } \ 1206 }, \ 1207 } \ 1208 }, \ 1209 } 1210 1211 #define LPC32XX_DEFINE_COMPOSITE(_idx, _mux, _div, _gate) \ 1212 [CLK_PREFIX(_idx)] = { \ 1213 .type = CLK_COMPOSITE, \ 1214 { \ 1215 .hw1 = { \ 1216 .mux = (CLK_PREFIX(_mux) == LPC32XX_CLK__NULL ? NULL : \ 1217 &clk_hw_proto[CLK_PREFIX(_mux)].hw0), \ 1218 .div = (CLK_PREFIX(_div) == LPC32XX_CLK__NULL ? NULL : \ 1219 &clk_hw_proto[CLK_PREFIX(_div)].hw0), \ 1220 .gate = (CLK_PREFIX(_gate) == LPC32XX_CLK__NULL ? NULL :\ 1221 &clk_hw_proto[CLK_PREFIX(_gate)].hw0), \ 1222 }, \ 1223 }, \ 1224 } 1225 1226 static struct clk_hw_proto clk_hw_proto[LPC32XX_CLK_HW_MAX] = { 1227 LPC32XX_DEFINE_FIXED(RTC, 32768), 1228 LPC32XX_DEFINE_PLL(PLL397X, pll_397x, HCLKPLL_CTRL, BIT(1)), 1229 LPC32XX_DEFINE_PLL(HCLK_PLL, hclk_pll, HCLKPLL_CTRL, PLL_CTRL_ENABLE), 1230 LPC32XX_DEFINE_PLL(USB_PLL, usb_pll, USB_CTRL, PLL_CTRL_ENABLE), 1231 LPC32XX_DEFINE_GATE(OSC, OSC_CTRL, 0, CLK_GATE_SET_TO_DISABLE), 1232 LPC32XX_DEFINE_GATE(USB, USB_CTRL, 18, 0), 1233 1234 LPC32XX_DEFINE_DIV(HCLK_DIV_PERIPH, HCLKDIV_CTRL, 2, 5, NULL, 1235 CLK_DIVIDER_READ_ONLY), 1236 LPC32XX_DEFINE_DIV(HCLK_DIV, HCLKDIV_CTRL, 0, 2, clk_hclk_div_table, 1237 CLK_DIVIDER_READ_ONLY), 1238 1239 /* Register 3 read-only muxes with a single control PWR_CTRL[2] */ 1240 LPC32XX_DEFINE_MUX(SYSCLK_PERIPH_MUX, PWR_CTRL, 2, 0x1, NULL, 1241 CLK_MUX_READ_ONLY), 1242 LPC32XX_DEFINE_MUX(SYSCLK_HCLK_MUX, PWR_CTRL, 2, 0x1, NULL, 1243 CLK_MUX_READ_ONLY), 1244 LPC32XX_DEFINE_MUX(SYSCLK_ARM_MUX, PWR_CTRL, 2, 0x1, NULL, 1245 CLK_MUX_READ_ONLY), 1246 /* Register 2 read-only muxes with a single control PWR_CTRL[10] */ 1247 LPC32XX_DEFINE_MUX(PERIPH_HCLK_MUX, PWR_CTRL, 10, 0x1, NULL, 1248 CLK_MUX_READ_ONLY), 1249 LPC32XX_DEFINE_MUX(PERIPH_ARM_MUX, PWR_CTRL, 10, 0x1, NULL, 1250 CLK_MUX_READ_ONLY), 1251 1252 /* 3 always on gates with a single control PWR_CTRL[0] same as OSC */ 1253 LPC32XX_DEFINE_GATE(PERIPH, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE), 1254 LPC32XX_DEFINE_GATE(HCLK, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE), 1255 LPC32XX_DEFINE_GATE(ARM, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE), 1256 1257 LPC32XX_DEFINE_GATE(ARM_VFP, DEBUG_CTRL, 4, 0), 1258 LPC32XX_DEFINE_GATE(DMA, DMA_CLK_CTRL, 0, 0), 1259 LPC32XX_DEFINE_CLK(DDRAM, HCLKDIV_CTRL, 0x0, BIT(8) | BIT(7), 1260 0x0, BIT(8) | BIT(7), 0x0, BIT(1) | BIT(0), clk_ddram_ops), 1261 1262 LPC32XX_DEFINE_GATE(TIMER0, TIMCLK_CTRL1, 2, 0), 1263 LPC32XX_DEFINE_GATE(TIMER1, TIMCLK_CTRL1, 3, 0), 1264 LPC32XX_DEFINE_GATE(TIMER2, TIMCLK_CTRL1, 4, 0), 1265 LPC32XX_DEFINE_GATE(TIMER3, TIMCLK_CTRL1, 5, 0), 1266 LPC32XX_DEFINE_GATE(TIMER4, TIMCLK_CTRL1, 0, 0), 1267 LPC32XX_DEFINE_GATE(TIMER5, TIMCLK_CTRL1, 1, 0), 1268 1269 LPC32XX_DEFINE_GATE(SSP0, SSP_CTRL, 0, 0), 1270 LPC32XX_DEFINE_GATE(SSP1, SSP_CTRL, 1, 0), 1271 LPC32XX_DEFINE_GATE(SPI1, SPI_CTRL, 0, 0), 1272 LPC32XX_DEFINE_GATE(SPI2, SPI_CTRL, 4, 0), 1273 LPC32XX_DEFINE_GATE(I2S0, I2S_CTRL, 0, 0), 1274 LPC32XX_DEFINE_GATE(I2S1, I2S_CTRL, 1, 0), 1275 LPC32XX_DEFINE_GATE(I2C1, I2CCLK_CTRL, 0, 0), 1276 LPC32XX_DEFINE_GATE(I2C2, I2CCLK_CTRL, 1, 0), 1277 LPC32XX_DEFINE_GATE(WDOG, TIMCLK_CTRL, 0, 0), 1278 LPC32XX_DEFINE_GATE(HSTIMER, TIMCLK_CTRL, 1, 0), 1279 1280 LPC32XX_DEFINE_GATE(KEY, KEYCLK_CTRL, 0, 0), 1281 LPC32XX_DEFINE_GATE(MCPWM, TIMCLK_CTRL1, 6, 0), 1282 1283 LPC32XX_DEFINE_MUX(PWM1_MUX, PWMCLK_CTRL, 1, 0x1, NULL, 0), 1284 LPC32XX_DEFINE_DIV(PWM1_DIV, PWMCLK_CTRL, 4, 4, NULL, 1285 CLK_DIVIDER_ONE_BASED), 1286 LPC32XX_DEFINE_GATE(PWM1_GATE, PWMCLK_CTRL, 0, 0), 1287 LPC32XX_DEFINE_COMPOSITE(PWM1, PWM1_MUX, PWM1_DIV, PWM1_GATE), 1288 1289 LPC32XX_DEFINE_MUX(PWM2_MUX, PWMCLK_CTRL, 3, 0x1, NULL, 0), 1290 LPC32XX_DEFINE_DIV(PWM2_DIV, PWMCLK_CTRL, 8, 4, NULL, 1291 CLK_DIVIDER_ONE_BASED), 1292 LPC32XX_DEFINE_GATE(PWM2_GATE, PWMCLK_CTRL, 2, 0), 1293 LPC32XX_DEFINE_COMPOSITE(PWM2, PWM2_MUX, PWM2_DIV, PWM2_GATE), 1294 1295 LPC32XX_DEFINE_MUX(UART3_MUX, UART3_CLK_CTRL, 16, 0x1, NULL, 0), 1296 LPC32XX_DEFINE_CLK(UART3_DIV, UART3_CLK_CTRL, 1297 0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops), 1298 LPC32XX_DEFINE_GATE(UART3_GATE, UART_CLK_CTRL, 0, 0), 1299 LPC32XX_DEFINE_COMPOSITE(UART3, UART3_MUX, UART3_DIV, UART3_GATE), 1300 1301 LPC32XX_DEFINE_MUX(UART4_MUX, UART4_CLK_CTRL, 16, 0x1, NULL, 0), 1302 LPC32XX_DEFINE_CLK(UART4_DIV, UART4_CLK_CTRL, 1303 0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops), 1304 LPC32XX_DEFINE_GATE(UART4_GATE, UART_CLK_CTRL, 1, 0), 1305 LPC32XX_DEFINE_COMPOSITE(UART4, UART4_MUX, UART4_DIV, UART4_GATE), 1306 1307 LPC32XX_DEFINE_MUX(UART5_MUX, UART5_CLK_CTRL, 16, 0x1, NULL, 0), 1308 LPC32XX_DEFINE_CLK(UART5_DIV, UART5_CLK_CTRL, 1309 0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops), 1310 LPC32XX_DEFINE_GATE(UART5_GATE, UART_CLK_CTRL, 2, 0), 1311 LPC32XX_DEFINE_COMPOSITE(UART5, UART5_MUX, UART5_DIV, UART5_GATE), 1312 1313 LPC32XX_DEFINE_MUX(UART6_MUX, UART6_CLK_CTRL, 16, 0x1, NULL, 0), 1314 LPC32XX_DEFINE_CLK(UART6_DIV, UART6_CLK_CTRL, 1315 0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops), 1316 LPC32XX_DEFINE_GATE(UART6_GATE, UART_CLK_CTRL, 3, 0), 1317 LPC32XX_DEFINE_COMPOSITE(UART6, UART6_MUX, UART6_DIV, UART6_GATE), 1318 1319 LPC32XX_DEFINE_CLK(IRDA, IRDA_CLK_CTRL, 1320 0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops), 1321 1322 LPC32XX_DEFINE_MUX(TEST1_MUX, TEST_CLK_CTRL, 5, 0x3, 1323 test1_mux_table, 0), 1324 LPC32XX_DEFINE_GATE(TEST1_GATE, TEST_CLK_CTRL, 4, 0), 1325 LPC32XX_DEFINE_COMPOSITE(TEST1, TEST1_MUX, _NULL, TEST1_GATE), 1326 1327 LPC32XX_DEFINE_MUX(TEST2_MUX, TEST_CLK_CTRL, 1, 0x7, 1328 test2_mux_table, 0), 1329 LPC32XX_DEFINE_GATE(TEST2_GATE, TEST_CLK_CTRL, 0, 0), 1330 LPC32XX_DEFINE_COMPOSITE(TEST2, TEST2_MUX, _NULL, TEST2_GATE), 1331 1332 LPC32XX_DEFINE_MUX(SYS, SYSCLK_CTRL, 0, 0x1, NULL, CLK_MUX_READ_ONLY), 1333 1334 LPC32XX_DEFINE_DIV(USB_DIV_DIV, USB_DIV, 0, 4, NULL, 0), 1335 LPC32XX_DEFINE_GATE(USB_DIV_GATE, USB_CTRL, 17, 0), 1336 LPC32XX_DEFINE_COMPOSITE(USB_DIV, _NULL, USB_DIV_DIV, USB_DIV_GATE), 1337 1338 LPC32XX_DEFINE_DIV(SD_DIV, MS_CTRL, 0, 4, NULL, CLK_DIVIDER_ONE_BASED), 1339 LPC32XX_DEFINE_CLK(SD_GATE, MS_CTRL, BIT(5) | BIT(9), BIT(5) | BIT(9), 1340 0x0, BIT(5) | BIT(9), 0x0, 0x0, clk_mask_ops), 1341 LPC32XX_DEFINE_COMPOSITE(SD, _NULL, SD_DIV, SD_GATE), 1342 1343 LPC32XX_DEFINE_DIV(LCD_DIV, LCDCLK_CTRL, 0, 5, NULL, 0), 1344 LPC32XX_DEFINE_GATE(LCD_GATE, LCDCLK_CTRL, 5, 0), 1345 LPC32XX_DEFINE_COMPOSITE(LCD, _NULL, LCD_DIV, LCD_GATE), 1346 1347 LPC32XX_DEFINE_CLK(MAC, MACCLK_CTRL, 1348 BIT(2) | BIT(1) | BIT(0), BIT(2) | BIT(1) | BIT(0), 1349 BIT(2) | BIT(1) | BIT(0), BIT(2) | BIT(1) | BIT(0), 1350 0x0, 0x0, clk_mask_ops), 1351 LPC32XX_DEFINE_CLK(SLC, FLASHCLK_CTRL, 1352 BIT(2) | BIT(0), BIT(2) | BIT(0), 0x0, 1353 BIT(0), BIT(1), BIT(2) | BIT(1), clk_mask_ops), 1354 LPC32XX_DEFINE_CLK(MLC, FLASHCLK_CTRL, 1355 BIT(1), BIT(2) | BIT(1), 0x0, BIT(1), 1356 BIT(2) | BIT(0), BIT(2) | BIT(0), clk_mask_ops), 1357 /* 1358 * ADC/TS clock unfortunately cannot be registered as a composite one 1359 * due to a different connection of gate, div and mux, e.g. gating it 1360 * won't mean that the clock is off, if peripheral clock is its parent: 1361 * 1362 * rtc-->[gate]-->| | 1363 * | mux |--> adc/ts 1364 * pclk-->[div]-->| | 1365 * 1366 * Constraints: 1367 * ADC --- resulting clock must be <= 4.5 MHz 1368 * TS --- resulting clock must be <= 400 KHz 1369 */ 1370 LPC32XX_DEFINE_DIV(ADC_DIV, ADCCLK_CTRL1, 0, 8, NULL, 0), 1371 LPC32XX_DEFINE_GATE(ADC_RTC, ADCCLK_CTRL, 0, 0), 1372 LPC32XX_DEFINE_MUX(ADC, ADCCLK_CTRL1, 8, 0x1, NULL, 0), 1373 1374 /* USB controller clocks */ 1375 LPC32XX_DEFINE_USB(USB_AHB, 1376 BIT(24), 0x0, BIT(24), BIT(4), 0, clk_usb_ops), 1377 LPC32XX_DEFINE_USB(USB_OTG, 1378 0x0, 0x0, 0x0, BIT(3), 0, clk_usb_ops), 1379 LPC32XX_DEFINE_USB(USB_I2C, 1380 0x0, BIT(23), BIT(23), BIT(2), 0, clk_usb_i2c_ops), 1381 LPC32XX_DEFINE_USB(USB_DEV, 1382 BIT(22), 0x0, BIT(22), BIT(1), BIT(0), clk_usb_ops), 1383 LPC32XX_DEFINE_USB(USB_HOST, 1384 BIT(21), 0x0, BIT(21), BIT(0), BIT(1), clk_usb_ops), 1385 }; 1386 1387 static struct clk * __init lpc32xx_clk_register(u32 id) 1388 { 1389 const struct clk_proto_t *lpc32xx_clk = &clk_proto[id]; 1390 struct clk_hw_proto *clk_hw = &clk_hw_proto[id]; 1391 const char *parents[LPC32XX_CLK_PARENTS_MAX]; 1392 struct clk *clk; 1393 unsigned int i; 1394 1395 for (i = 0; i < lpc32xx_clk->num_parents; i++) 1396 parents[i] = clk_proto[lpc32xx_clk->parents[i]].name; 1397 1398 pr_debug("%s: derived from '%s', clock type %d\n", lpc32xx_clk->name, 1399 parents[0], clk_hw->type); 1400 1401 switch (clk_hw->type) { 1402 case CLK_LPC32XX: 1403 case CLK_LPC32XX_PLL: 1404 case CLK_LPC32XX_USB: 1405 case CLK_MUX: 1406 case CLK_DIV: 1407 case CLK_GATE: 1408 { 1409 struct clk_init_data clk_init = { 1410 .name = lpc32xx_clk->name, 1411 .parent_names = parents, 1412 .num_parents = lpc32xx_clk->num_parents, 1413 .flags = lpc32xx_clk->flags, 1414 .ops = clk_hw->hw0.ops, 1415 }; 1416 struct clk_hw *hw; 1417 1418 if (clk_hw->type == CLK_LPC32XX) 1419 hw = &clk_hw->hw0.clk.hw; 1420 else if (clk_hw->type == CLK_LPC32XX_PLL) 1421 hw = &clk_hw->hw0.pll.hw; 1422 else if (clk_hw->type == CLK_LPC32XX_USB) 1423 hw = &clk_hw->hw0.usb_clk.hw; 1424 else if (clk_hw->type == CLK_MUX) 1425 hw = &clk_hw->hw0.mux.hw; 1426 else if (clk_hw->type == CLK_DIV) 1427 hw = &clk_hw->hw0.div.hw; 1428 else if (clk_hw->type == CLK_GATE) 1429 hw = &clk_hw->hw0.gate.hw; 1430 else 1431 return ERR_PTR(-EINVAL); 1432 1433 hw->init = &clk_init; 1434 clk = clk_register(NULL, hw); 1435 break; 1436 } 1437 case CLK_COMPOSITE: 1438 { 1439 struct clk_hw *mux_hw = NULL, *div_hw = NULL, *gate_hw = NULL; 1440 const struct clk_ops *mops = NULL, *dops = NULL, *gops = NULL; 1441 struct clk_hw_proto0 *mux0, *div0, *gate0; 1442 1443 mux0 = clk_hw->hw1.mux; 1444 div0 = clk_hw->hw1.div; 1445 gate0 = clk_hw->hw1.gate; 1446 if (mux0) { 1447 mops = mux0->ops; 1448 mux_hw = &mux0->clk.hw; 1449 } 1450 if (div0) { 1451 dops = div0->ops; 1452 div_hw = &div0->clk.hw; 1453 } 1454 if (gate0) { 1455 gops = gate0->ops; 1456 gate_hw = &gate0->clk.hw; 1457 } 1458 1459 clk = clk_register_composite(NULL, lpc32xx_clk->name, 1460 parents, lpc32xx_clk->num_parents, 1461 mux_hw, mops, div_hw, dops, 1462 gate_hw, gops, lpc32xx_clk->flags); 1463 break; 1464 } 1465 case CLK_FIXED: 1466 { 1467 struct clk_fixed_rate *fixed = &clk_hw->f; 1468 1469 clk = clk_register_fixed_rate(NULL, lpc32xx_clk->name, 1470 parents[0], 0, fixed->fixed_rate); 1471 break; 1472 } 1473 default: 1474 clk = ERR_PTR(-EINVAL); 1475 } 1476 1477 return clk; 1478 } 1479 1480 static void __init lpc32xx_clk_div_quirk(u32 reg, u32 div_mask, u32 gate) 1481 { 1482 u32 val; 1483 1484 regmap_read(clk_regmap, reg, &val); 1485 1486 if (!(val & div_mask)) { 1487 val &= ~gate; 1488 val |= BIT(__ffs(div_mask)); 1489 } 1490 1491 regmap_update_bits(clk_regmap, reg, gate | div_mask, val); 1492 } 1493 1494 static void __init lpc32xx_clk_init(struct device_node *np) 1495 { 1496 unsigned int i; 1497 struct clk *clk_osc, *clk_32k; 1498 void __iomem *base = NULL; 1499 1500 /* Ensure that parent clocks are available and valid */ 1501 clk_32k = of_clk_get_by_name(np, clk_proto[LPC32XX_CLK_XTAL_32K].name); 1502 if (IS_ERR(clk_32k)) { 1503 pr_err("failed to find external 32KHz clock: %ld\n", 1504 PTR_ERR(clk_32k)); 1505 return; 1506 } 1507 if (clk_get_rate(clk_32k) != 32768) { 1508 pr_err("invalid clock rate of external 32KHz oscillator\n"); 1509 return; 1510 } 1511 1512 clk_osc = of_clk_get_by_name(np, clk_proto[LPC32XX_CLK_XTAL].name); 1513 if (IS_ERR(clk_osc)) { 1514 pr_err("failed to find external main oscillator clock: %ld\n", 1515 PTR_ERR(clk_osc)); 1516 return; 1517 } 1518 1519 base = of_iomap(np, 0); 1520 if (!base) { 1521 pr_err("failed to map system control block registers\n"); 1522 return; 1523 } 1524 1525 clk_regmap = regmap_init_mmio(NULL, base, &lpc32xx_scb_regmap_config); 1526 if (IS_ERR(clk_regmap)) { 1527 pr_err("failed to regmap system control block: %ld\n", 1528 PTR_ERR(clk_regmap)); 1529 iounmap(base); 1530 return; 1531 } 1532 1533 /* 1534 * Divider part of PWM and MS clocks requires a quirk to avoid 1535 * a misinterpretation of formally valid zero value in register 1536 * bitfield, which indicates another clock gate. Instead of 1537 * adding complexity to a gate clock ensure that zero value in 1538 * divider clock is never met in runtime. 1539 */ 1540 lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_PWMCLK_CTRL, 0xf0, BIT(0)); 1541 lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_PWMCLK_CTRL, 0xf00, BIT(2)); 1542 lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_MS_CTRL, 0xf, BIT(5) | BIT(9)); 1543 1544 for (i = 1; i < LPC32XX_CLK_MAX; i++) { 1545 clk[i] = lpc32xx_clk_register(i); 1546 if (IS_ERR(clk[i])) { 1547 pr_err("failed to register %s clock: %ld\n", 1548 clk_proto[i].name, PTR_ERR(clk[i])); 1549 clk[i] = NULL; 1550 } 1551 } 1552 1553 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); 1554 1555 /* Set 48MHz rate of USB PLL clock */ 1556 clk_set_rate(clk[LPC32XX_CLK_USB_PLL], 48000000); 1557 1558 /* These two clocks must be always on independently on consumers */ 1559 clk_prepare_enable(clk[LPC32XX_CLK_ARM]); 1560 clk_prepare_enable(clk[LPC32XX_CLK_HCLK]); 1561 1562 /* Enable ARM VFP by default */ 1563 clk_prepare_enable(clk[LPC32XX_CLK_ARM_VFP]); 1564 1565 /* Disable enabled by default clocks for NAND MLC and SLC */ 1566 clk_mask_disable(&clk_hw_proto[LPC32XX_CLK_SLC].hw0.clk.hw); 1567 clk_mask_disable(&clk_hw_proto[LPC32XX_CLK_MLC].hw0.clk.hw); 1568 } 1569 CLK_OF_DECLARE(lpc32xx_clk, "nxp,lpc3220-clk", lpc32xx_clk_init); 1570 1571 static void __init lpc32xx_usb_clk_init(struct device_node *np) 1572 { 1573 unsigned int i; 1574 1575 usb_clk_vbase = of_iomap(np, 0); 1576 if (!usb_clk_vbase) { 1577 pr_err("failed to map address range\n"); 1578 return; 1579 } 1580 1581 for (i = 1; i < LPC32XX_USB_CLK_MAX; i++) { 1582 usb_clk[i] = lpc32xx_clk_register(i + LPC32XX_CLK_USB_OFFSET); 1583 if (IS_ERR(usb_clk[i])) { 1584 pr_err("failed to register %s clock: %ld\n", 1585 clk_proto[i].name, PTR_ERR(usb_clk[i])); 1586 usb_clk[i] = NULL; 1587 } 1588 } 1589 1590 of_clk_add_provider(np, of_clk_src_onecell_get, &usb_clk_data); 1591 } 1592 CLK_OF_DECLARE(lpc32xx_usb_clk, "nxp,lpc3220-usb-clk", lpc32xx_usb_clk_init); 1593