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");
64 uint32_t old_baud = serial_early_get_baud();
66 if (BFIN_DEBUG_EARLY_SERIAL) {
69 /* If the UART is off, that means we need to program
70 * the baud rate ourselves initially.
73 old_baud = CONFIG_BAUDRATE;
74 serial_early_set_baud(CONFIG_BAUDRATE);
81 __attribute__((always_inline))
82 static inline void serial_deinit(void)
85 if (BFIN_UART_USE_RTS && CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART) {
86 /* clear forced RTS rather than relying on auto RTS */
87 bfin_write_UART1_MCR(bfin_read_UART1_MCR() & ~FCPOL);
92 /* We need to reset the baud rate when we have early debug turned on
93 * or when we are booting over the UART.
94 * XXX: we should fix this to calc the old baud and restore it rather
95 * than hardcoding it via CONFIG_LDR_LOAD_BAUD ... but we have
96 * to figure out how to avoid the division in the baud calc ...
98 __attribute__((always_inline))
99 static inline void serial_reset_baud(uint32_t baud)
101 if (!BFIN_DEBUG_EARLY_SERIAL && CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_UART)
104 #ifndef CONFIG_LDR_LOAD_BAUD
105 # define CONFIG_LDR_LOAD_BAUD 115200
108 if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS)
109 serial_early_set_baud(baud);
110 else if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_UART)
111 serial_early_set_baud(CONFIG_LDR_LOAD_BAUD);
113 serial_early_set_baud(CONFIG_BAUDRATE);
116 __attribute__((always_inline))
117 static inline void serial_putc(char c)
119 if (!BFIN_DEBUG_EARLY_SERIAL)
127 while (!(*pUART_LSR & TEMT))
132 /* Max SCLK can be 133MHz ... dividing that by 4 gives
133 * us a freq of 33MHz for SPI which should generally be
134 * slow enough for the slow reads the bootrom uses.
136 #ifndef CONFIG_SPI_BAUD_INITBLOCK
137 # define CONFIG_SPI_BAUD_INITBLOCK 4
140 /* PLL_DIV defines */
141 #ifndef CONFIG_PLL_DIV_VAL
142 # if (CONFIG_CCLK_DIV == 1)
143 # define CONFIG_CCLK_ACT_DIV CCLK_DIV1
144 # elif (CONFIG_CCLK_DIV == 2)
145 # define CONFIG_CCLK_ACT_DIV CCLK_DIV2
146 # elif (CONFIG_CCLK_DIV == 4)
147 # define CONFIG_CCLK_ACT_DIV CCLK_DIV4
148 # elif (CONFIG_CCLK_DIV == 8)
149 # define CONFIG_CCLK_ACT_DIV CCLK_DIV8
151 # define CONFIG_CCLK_ACT_DIV CONFIG_CCLK_DIV_not_defined_properly
153 # define CONFIG_PLL_DIV_VAL (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV)
156 #ifndef CONFIG_PLL_LOCKCNT_VAL
157 # define CONFIG_PLL_LOCKCNT_VAL 0x0300
160 #ifndef CONFIG_PLL_CTL_VAL
161 # define CONFIG_PLL_CTL_VAL (SPORT_HYST | (CONFIG_VCO_MULT << 9))
164 #ifndef CONFIG_EBIU_RSTCTL_VAL
165 # define CONFIG_EBIU_RSTCTL_VAL 0 /* only MDDRENABLE is useful */
168 #ifndef CONFIG_EBIU_MBSCTL_VAL
169 # define CONFIG_EBIU_MBSCTL_VAL 0
172 /* Make sure our voltage value is sane so we don't blow up! */
173 #ifndef CONFIG_VR_CTL_VAL
174 # define BFIN_CCLK ((CONFIG_CLKIN_HZ * CONFIG_VCO_MULT) / CONFIG_CCLK_DIV)
175 # if defined(__ADSPBF533__) || defined(__ADSPBF532__) || defined(__ADSPBF531__)
176 # define CCLK_VLEV_120 400000000
177 # define CCLK_VLEV_125 533000000
178 # elif defined(__ADSPBF537__) || defined(__ADSPBF536__) || defined(__ADSPBF534__)
179 # define CCLK_VLEV_120 401000000
180 # define CCLK_VLEV_125 401000000
181 # elif defined(__ADSPBF561__)
182 # define CCLK_VLEV_120 300000000
183 # define CCLK_VLEV_125 501000000
185 # if BFIN_CCLK < CCLK_VLEV_120
186 # define CONFIG_VR_CTL_VLEV VLEV_120
187 # elif BFIN_CCLK < CCLK_VLEV_125
188 # define CONFIG_VR_CTL_VLEV VLEV_125
190 # define CONFIG_VR_CTL_VLEV VLEV_130
192 # if defined(__ADSPBF52x__) /* TBD; use default */
193 # undef CONFIG_VR_CTL_VLEV
194 # define CONFIG_VR_CTL_VLEV VLEV_110
195 # elif defined(__ADSPBF54x__) /* TBD; use default */
196 # undef CONFIG_VR_CTL_VLEV
197 # define CONFIG_VR_CTL_VLEV VLEV_120
200 # ifdef CONFIG_BFIN_MAC
201 # define CONFIG_VR_CTL_CLKBUF CLKBUFOE
203 # define CONFIG_VR_CTL_CLKBUF 0
206 # if defined(__ADSPBF52x__)
207 # define CONFIG_VR_CTL_FREQ FREQ_1000
209 # define CONFIG_VR_CTL_FREQ (GAIN_20 | FREQ_1000)
212 # define CONFIG_VR_CTL_VAL (CONFIG_VR_CTL_CLKBUF | CONFIG_VR_CTL_VLEV | CONFIG_VR_CTL_FREQ)
215 __attribute__((saveall))
216 void initcode(ADI_BOOT_DATA *bootstruct)
218 uint32_t old_baud = serial_init();
220 #ifdef CONFIG_HW_WATCHDOG
221 # ifndef CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE
222 # define CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE 20000
224 /* Program the watchdog with an initial timeout of ~20 seconds.
225 * Hopefully that should be long enough to load the u-boot LDR
226 * (from wherever) and then the common u-boot code can take over.
227 * In bypass mode, the start.S would have already set a much lower
228 * timeout, so don't clobber that.
230 if (CONFIG_BFIN_BOOT_MODE != BFIN_BOOT_BYPASS) {
231 bfin_write_WDOG_CNT(MSEC_TO_SCLK(CONFIG_HW_WATCHDOG_TIMEOUT_INITCODE));
232 bfin_write_WDOG_CTL(0);
238 /* Blackfin bootroms use the SPI slow read opcode instead of the SPI
239 * fast read, so we need to slow down the SPI clock a lot more during
240 * boot. Once we switch over to u-boot's SPI flash driver, we'll
241 * increase the speed appropriately.
243 if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_SPI_MASTER)
245 bfin_write_SPI0_BAUD(CONFIG_SPI_BAUD_INITBLOCK);
247 bfin_write_SPI_BAUD(CONFIG_SPI_BAUD_INITBLOCK);
252 /* Disable all peripheral wakeups except for the PLL event. */
254 bfin_write_SIC_IWR0(1);
255 bfin_write_SIC_IWR1(0);
257 bfin_write_SIC_IWR2(0);
259 #elif defined(SICA_IWR0)
260 bfin_write_SICA_IWR0(1);
261 bfin_write_SICA_IWR1(0);
263 bfin_write_SIC_IWR(1);
268 bfin_write_PLL_LOCKCNT(CONFIG_PLL_LOCKCNT_VAL);
272 /* Only reprogram when needed to avoid triggering unnecessary
273 * PLL relock sequences.
275 if (bfin_read_VR_CTL() != CONFIG_VR_CTL_VAL) {
277 bfin_write_VR_CTL(CONFIG_VR_CTL_VAL);
283 bfin_write_PLL_DIV(CONFIG_PLL_DIV_VAL);
287 /* Only reprogram when needed to avoid triggering unnecessary
288 * PLL relock sequences.
290 if (bfin_read_PLL_CTL() != CONFIG_PLL_CTL_VAL) {
292 bfin_write_PLL_CTL(CONFIG_PLL_CTL_VAL);
296 /* Since we've changed the SCLK above, we may need to update
297 * the UART divisors (UART baud rates are based on SCLK).
299 serial_reset_baud(old_baud);
303 /* Program the async banks controller. */
304 bfin_write_EBIU_AMBCTL0(CONFIG_EBIU_AMBCTL0_VAL);
305 bfin_write_EBIU_AMBCTL1(CONFIG_EBIU_AMBCTL1_VAL);
306 bfin_write_EBIU_AMGCTL(CONFIG_EBIU_AMGCTL_VAL);
309 /* Not all parts have these additional MMRs. */
310 bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTL_VAL);
311 bfin_write_EBIU_MODE(CONFIG_EBIU_MODE_VAL);
312 bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTL_VAL);
317 /* Program the external memory controller. */
319 bfin_write_EBIU_RSTCTL(bfin_read_EBIU_RSTCTL() | 0x1 /*DDRSRESET*/ | CONFIG_EBIU_RSTCTL_VAL);
320 bfin_write_EBIU_DDRCTL0(CONFIG_EBIU_DDRCTL0_VAL);
321 bfin_write_EBIU_DDRCTL1(CONFIG_EBIU_DDRCTL1_VAL);
322 bfin_write_EBIU_DDRCTL2(CONFIG_EBIU_DDRCTL2_VAL);
323 # ifdef CONFIG_EBIU_DDRCTL3_VAL
324 /* default is disable, so don't need to force this */
325 bfin_write_EBIU_DDRCTL3(CONFIG_EBIU_DDRCTL3_VAL);
328 bfin_write_EBIU_SDRRC(CONFIG_EBIU_SDRRC_VAL);
329 bfin_write_EBIU_SDBCTL(CONFIG_EBIU_SDBCTL_VAL);
330 bfin_write_EBIU_SDGCTL(CONFIG_EBIU_SDGCTL_VAL);
335 /* Restore all peripheral wakeups. */
337 bfin_write_SIC_IWR0(-1);
338 bfin_write_SIC_IWR1(-1);
340 bfin_write_SIC_IWR2(-1);
342 #elif defined(SICA_IWR0)
343 bfin_write_SICA_IWR0(-1);
344 bfin_write_SICA_IWR1(-1);
346 bfin_write_SIC_IWR(-1);