2 * initcode.c - Initialize the processor. This is usually entails things
3 * like external memory, voltage regulators, etc... Note that this file
4 * cannot make any function calls as it may be executed all by itself by
5 * the Blackfin's bootrom in LDR format.
7 * Copyright (c) 2004-2008 Analog Devices Inc.
9 * Licensed under the GPL-2 or later.
13 #include <asm/blackfin.h>
14 #include <asm/mach-common/bits/bootrom.h>
15 #include <asm/mach-common/bits/ebiu.h>
16 #include <asm/mach-common/bits/pll.h>
17 #include <asm/mach-common/bits/uart.h>
19 #define BFIN_IN_INITCODE
22 __attribute__((always_inline))
23 static inline uint32_t serial_init(void)
26 # ifdef BFIN_BOOT_UART_USE_RTS
27 # define BFIN_UART_USE_RTS 1
29 # define BFIN_UART_USE_RTS 0
31 if (BFIN_UART_USE_RTS && CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) {
34 /* force RTS rather than relying on auto RTS */
35 bfin_write_UART1_MCR(bfin_read_UART1_MCR() | FCPOL);
37 /* Wait for the line to clear up. We cannot rely on UART
38 * registers as none of them reflect the status of the RSR.
39 * Instead, we'll sleep for ~10 bit times at 9600 baud.
40 * We can precalc things here by assuming boot values for
41 * PLL rather than loading registers and calculating.
42 * baud = SCLK / (16 ^ (1 - EDBO) * Divisor)
44 * Divisor = (SCLK / baud) / 16
45 * SCLK = baud * 16 * Divisor
46 * SCLK = (0x14 * CONFIG_CLKIN_HZ) / 5
47 * CCLK = (16 * Divisor * 5) * (9600 / 10)
48 * In reality, this will probably be just about 1 second delay,
49 * so assuming 9600 baud is OK (both as a very low and too high
50 * speed as this will buffer things enough).
52 #define _NUMBITS (10) /* how many bits to delay */
53 #define _LOWBAUD (9600) /* low baud rate */
54 #define _SCLK ((0x14 * CONFIG_CLKIN_HZ) / 5) /* SCLK based on PLL */
55 #define _DIVISOR ((_SCLK / _LOWBAUD) / 16) /* UART DLL/DLH */
56 #define _NUMINS (3) /* how many instructions in loop */
57 #define _CCLK (((16 * _DIVISOR * 5) * (_LOWBAUD / _NUMBITS)) / _NUMINS)
60 asm volatile("" : : : "memory");
65 if (BFIN_DEBUG_EARLY_SERIAL || CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART)
66 old_baud = serial_early_get_baud();
68 old_baud = CONFIG_BAUDRATE;
70 if (BFIN_DEBUG_EARLY_SERIAL) {
73 /* If the UART is off, that means we need to program
74 * the baud rate ourselves initially.
77 old_baud = CONFIG_BAUDRATE;
78 serial_early_set_baud(CONFIG_BAUDRATE);
85 __attribute__((always_inline))
86 static inline void serial_deinit(void)
89 if (BFIN_UART_USE_RTS && CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) {
90 /* clear forced RTS rather than relying on auto RTS */
91 bfin_write_UART1_MCR(bfin_read_UART1_MCR() & ~FCPOL);
96 /* We need to reset the baud rate when we have early debug turned on
97 * or when we are booting over the UART.
98 * XXX: we should fix this to calc the old baud and restore it rather
99 * than hardcoding it via CONFIG_LDR_LOAD_BAUD ... but we have
100 * to figure out how to avoid the division in the baud calc ...
102 __attribute__((always_inline))
103 static inline void serial_reset_baud(uint32_t baud)
105 if (!BFIN_DEBUG_EARLY_SERIAL && CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_UART)
108 #ifndef CONFIG_LDR_LOAD_BAUD
109 # define CONFIG_LDR_LOAD_BAUD 115200
112 if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS)
113 serial_early_set_baud(baud);
114 else if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART)
115 serial_early_set_baud(CONFIG_LDR_LOAD_BAUD);
117 serial_early_set_baud(CONFIG_BAUDRATE);
120 __attribute__((always_inline))
121 static inline void serial_putc(char c)
123 if (!BFIN_DEBUG_EARLY_SERIAL)
131 while (!(*pUART_LSR & TEMT))
136 /* Max SCLK can be 133MHz ... dividing that by (2*4) gives
137 * us a freq of 16MHz for SPI which should generally be
138 * slow enough for the slow reads the bootrom uses.
140 #if !defined(CONFIG_SPI_FLASH_SLOW_READ) && \
141 ((defined(__ADSPBF52x__) && __SILICON_REVISION__ >= 2) || \
142 (defined(__ADSPBF54x__) && __SILICON_REVISION__ >= 1))
143 # define BOOTROM_SUPPORTS_SPI_FAST_READ 1
145 # define BOOTROM_SUPPORTS_SPI_FAST_READ 0
147 #ifndef CONFIG_SPI_BAUD_INITBLOCK
148 # define CONFIG_SPI_BAUD_INITBLOCK (BOOTROM_SUPPORTS_SPI_FAST_READ ? 2 : 4)
151 # define bfin_write_SPI_BAUD bfin_write_SPI0_BAUD
154 /* PLL_DIV defines */
155 #ifndef CONFIG_PLL_DIV_VAL
156 # if (CONFIG_CCLK_DIV == 1)
157 # define CONFIG_CCLK_ACT_DIV CCLK_DIV1
158 # elif (CONFIG_CCLK_DIV == 2)
159 # define CONFIG_CCLK_ACT_DIV CCLK_DIV2
160 # elif (CONFIG_CCLK_DIV == 4)
161 # define CONFIG_CCLK_ACT_DIV CCLK_DIV4
162 # elif (CONFIG_CCLK_DIV == 8)
163 # define CONFIG_CCLK_ACT_DIV CCLK_DIV8
165 # define CONFIG_CCLK_ACT_DIV CONFIG_CCLK_DIV_not_defined_properly
167 # define CONFIG_PLL_DIV_VAL (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV)
170 #ifndef CONFIG_PLL_LOCKCNT_VAL
171 # define CONFIG_PLL_LOCKCNT_VAL 0x0300
174 #ifndef CONFIG_PLL_CTL_VAL
175 # define CONFIG_PLL_CTL_VAL (SPORT_HYST | (CONFIG_VCO_MULT << 9) | CONFIG_CLKIN_HALF)
178 #ifndef CONFIG_EBIU_RSTCTL_VAL
179 # define CONFIG_EBIU_RSTCTL_VAL 0 /* only MDDRENABLE is useful */
181 #if ((CONFIG_EBIU_RSTCTL_VAL & 0xFFFFFFC4) != 0)
182 # error invalid EBIU_RSTCTL value: must not set reserved bits
185 #ifndef CONFIG_EBIU_MBSCTL_VAL
186 # define CONFIG_EBIU_MBSCTL_VAL 0
189 #if defined(CONFIG_EBIU_DDRQUE_VAL) && ((CONFIG_EBIU_DDRQUE_VAL & 0xFFFF8000) != 0)
190 # error invalid EBIU_DDRQUE value: must not set reserved bits
193 /* Make sure our voltage value is sane so we don't blow up! */
194 #ifndef CONFIG_VR_CTL_VAL
195 # define BFIN_CCLK ((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_CCLK_DIV)
196 # if defined(__ADSPBF533__) || defined(__ADSPBF532__) || defined(__ADSPBF531__)
197 # define CCLK_VLEV_120 400000000
198 # define CCLK_VLEV_125 533000000
199 # elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
200 # define CCLK_VLEV_120 401000000
201 # define CCLK_VLEV_125 401000000
202 # elif defined(__ADSPBF561__)
203 # define CCLK_VLEV_120 300000000
204 # define CCLK_VLEV_125 501000000
206 # if BFIN_CCLK < CCLK_VLEV_120
207 # define CONFIG_VR_CTL_VLEV VLEV_120
208 # elif BFIN_CCLK < CCLK_VLEV_125
209 # define CONFIG_VR_CTL_VLEV VLEV_125
211 # define CONFIG_VR_CTL_VLEV VLEV_130
213 # if defined(__ADSPBF52x__) /* TBD; use default */
214 # undef CONFIG_VR_CTL_VLEV
215 # define CONFIG_VR_CTL_VLEV VLEV_110
216 # elif defined(__ADSPBF54x__) /* TBD; use default */
217 # undef CONFIG_VR_CTL_VLEV
218 # define CONFIG_VR_CTL_VLEV VLEV_120
219 # elif defined(__ADSPBF538__) || defined(__ADSPBF539__) /* TBD; use default */
220 # undef CONFIG_VR_CTL_VLEV
221 # define CONFIG_VR_CTL_VLEV VLEV_125
224 # ifdef CONFIG_BFIN_MAC
225 # define CONFIG_VR_CTL_CLKBUF CLKBUFOE
227 # define CONFIG_VR_CTL_CLKBUF 0
230 # if defined(__ADSPBF52x__)
231 # define CONFIG_VR_CTL_FREQ FREQ_1000
233 # define CONFIG_VR_CTL_FREQ (GAIN_20 | FREQ_1000)
236 # define CONFIG_VR_CTL_VAL (CONFIG_VR_CTL_CLKBUF | CONFIG_VR_CTL_VLEV | CONFIG_VR_CTL_FREQ)
239 BOOTROM_CALLED_FUNC_ATTR
240 void initcode(ADI_BOOT_DATA *bootstruct)
242 uint32_t old_baud = serial_init();
244 #ifdef CONFIG_HW_WATCHDOG
245 # ifndef CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE
246 # define CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE 20000
248 /* Program the watchdog with an initial timeout of ~20 seconds.
249 * Hopefully that should be long enough to load the u-boot LDR
250 * (from wherever) and then the common u-boot code can take over.
251 * In bypass mode, the start.S would have already set a much lower
252 * timeout, so don't clobber that.
254 if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) {
255 bfin_write_WDOG_CNT(MSEC_TO_SCLK(CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE));
256 bfin_write_WDOG_CTL(0);
262 /* Blackfin bootroms use the SPI slow read opcode instead of the SPI
263 * fast read, so we need to slow down the SPI clock a lot more during
264 * boot. Once we switch over to u-boot's SPI flash driver, we'll
265 * increase the speed appropriately.
267 if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_SPI_MASTER) {
268 if (BOOTROM_SUPPORTS_SPI_FAST_READ && CONFIG_SPI_BAUD_INITBLOCK < 4)
269 bootstruct->dFlags |= BFLAG_FASTREAD;
270 bfin_write_SPI_BAUD(CONFIG_SPI_BAUD_INITBLOCK);
275 /* Disable all peripheral wakeups except for the PLL event. */
277 bfin_write_SIC_IWR0(1);
278 bfin_write_SIC_IWR1(0);
280 bfin_write_SIC_IWR2(0);
282 #elif defined(SICA_IWR0)
283 bfin_write_SICA_IWR0(1);
284 bfin_write_SICA_IWR1(0);
286 bfin_write_SIC_IWR(1);
289 /* With newer bootroms, we use the helper function to set up
290 * the memory controller. Older bootroms lacks such helpers
291 * so we do it ourselves.
293 if (BOOTROM_CAPS_SYSCONTROL) {
296 ADI_SYSCTRL_VALUES memory_settings;
297 memory_settings.uwVrCtl = CONFIG_VR_CTL_VAL;
298 memory_settings.uwPllCtl = CONFIG_PLL_CTL_VAL;
299 memory_settings.uwPllDiv = CONFIG_PLL_DIV_VAL;
300 memory_settings.uwPllLockCnt = CONFIG_PLL_LOCKCNT_VAL;
301 syscontrol(SYSCTRL_WRITE | SYSCTRL_VRCTL | SYSCTRL_PLLCTL | SYSCTRL_PLLDIV | SYSCTRL_LOCKCNT |
302 (CONFIG_VR_CTL_VAL & FREQ_MASK ? SYSCTRL_INTVOLTAGE : SYSCTRL_EXTVOLTAGE), &memory_settings, NULL);
306 bfin_write_PLL_LOCKCNT(CONFIG_PLL_LOCKCNT_VAL);
310 /* Only reprogram when needed to avoid triggering unnecessary
311 * PLL relock sequences.
313 if (bfin_read_VR_CTL() != CONFIG_VR_CTL_VAL) {
315 bfin_write_VR_CTL(CONFIG_VR_CTL_VAL);
321 bfin_write_PLL_DIV(CONFIG_PLL_DIV_VAL);
325 /* Only reprogram when needed to avoid triggering unnecessary
326 * PLL relock sequences.
328 if (bfin_read_PLL_CTL() != CONFIG_PLL_CTL_VAL) {
330 bfin_write_PLL_CTL(CONFIG_PLL_CTL_VAL);
335 /* Since we've changed the SCLK above, we may need to update
336 * the UART divisors (UART baud rates are based on SCLK).
338 serial_reset_baud(old_baud);
342 /* Program the async banks controller. */
343 bfin_write_EBIU_AMBCTL0(CONFIG_EBIU_AMBCTL0_VAL);
344 bfin_write_EBIU_AMBCTL1(CONFIG_EBIU_AMBCTL1_VAL);
345 bfin_write_EBIU_AMGCTL(CONFIG_EBIU_AMGCTL_VAL);
348 /* Not all parts have these additional MMRs. */
349 bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTL_VAL);
350 bfin_write_EBIU_MODE(CONFIG_EBIU_MODE_VAL);
351 bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTL_VAL);
356 /* Program the external memory controller. */
358 bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | 0x1 /*DDRSRESET*/ | CONFIG_EBIU_RSTCTL_VAL);
359 bfin_write_EBIU_DDRCTL0(CONFIG_EBIU_DDRCTL0_VAL);
360 bfin_write_EBIU_DDRCTL1(CONFIG_EBIU_DDRCTL1_VAL);
361 bfin_write_EBIU_DDRCTL2(CONFIG_EBIU_DDRCTL2_VAL);
362 # ifdef CONFIG_EBIU_DDRCTL3_VAL
363 /* default is disable, so don't need to force this */
364 bfin_write_EBIU_DDRCTL3(CONFIG_EBIU_DDRCTL3_VAL);
367 bfin_write_EBIU_SDRRC(CONFIG_EBIU_SDRRC_VAL);
368 bfin_write_EBIU_SDBCTL(CONFIG_EBIU_SDBCTL_VAL);
369 bfin_write_EBIU_SDGCTL(CONFIG_EBIU_SDGCTL_VAL);
374 /* Restore all peripheral wakeups. */
376 bfin_write_SIC_IWR0(-1);
377 bfin_write_SIC_IWR1(-1);
379 bfin_write_SIC_IWR2(-1);
381 #elif defined(SICA_IWR0)
382 bfin_write_SICA_IWR0(-1);
383 bfin_write_SICA_IWR1(-1);
385 bfin_write_SIC_IWR(-1);