2 * Most of this taken from Redboot hal_platform_setup.h with cleanup
4 * NOTE: I haven't clean this up considerably, just enough to get it
5 * running. See hal_platform_setup.h for the source. See
6 * board/cradle/lowlevel_init.S for another PXA250 setup that is
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 #include <asm/arch/pxa-regs.h>
32 DRAM_SIZE: .long CONFIG_SYS_DRAM_SIZE
34 /* wait for coprocessor write complete */
36 mrc p15,0,\reg,c2,c0,0
51 /* Set up GPIO pins first ----------------------------------------- */
54 ldr r1, =CONFIG_SYS_GPSR0_VAL
58 ldr r1, =CONFIG_SYS_GPSR1_VAL
62 ldr r1, =CONFIG_SYS_GPSR2_VAL
66 ldr r1, =CONFIG_SYS_GPCR0_VAL
70 ldr r1, =CONFIG_SYS_GPCR1_VAL
74 ldr r1, =CONFIG_SYS_GPCR2_VAL
78 ldr r1, =CONFIG_SYS_GPDR0_VAL
82 ldr r1, =CONFIG_SYS_GPDR1_VAL
86 ldr r1, =CONFIG_SYS_GPDR2_VAL
90 ldr r1, =CONFIG_SYS_GAFR0_L_VAL
94 ldr r1, =CONFIG_SYS_GAFR0_U_VAL
98 ldr r1, =CONFIG_SYS_GAFR1_L_VAL
102 ldr r1, =CONFIG_SYS_GAFR1_U_VAL
106 ldr r1, =CONFIG_SYS_GAFR2_L_VAL
110 ldr r1, =CONFIG_SYS_GAFR2_U_VAL
113 ldr r0, =PSSR /* enable GPIO pins */
114 ldr r1, =CONFIG_SYS_PSSR_VAL
117 /* ---------------------------------------------------------------- */
118 /* Enable memory interface */
120 /* The sequence below is based on the recommended init steps */
121 /* detailed in the Intel PXA250 Operating Systems Developers Guide, */
123 /* ---------------------------------------------------------------- */
125 /* ---------------------------------------------------------------- */
126 /* Step 1: Wait for at least 200 microsedonds to allow internal */
127 /* clocks to settle. Only necessary after hard reset... */
128 /* FIXME: can be optimized later */
129 /* ---------------------------------------------------------------- */
131 ldr r3, =OSCR /* reset the OS Timer Count to zero */
134 ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
135 /* so 0x300 should be plenty */
143 ldr r1, =MEMC_BASE /* get memory controller base addr. */
145 /* ---------------------------------------------------------------- */
146 /* Step 2a: Initialize Asynchronous static memory controller */
147 /* ---------------------------------------------------------------- */
149 /* MSC registers: timing, bus width, mem type */
152 ldr r2, =CONFIG_SYS_MSC0_VAL
153 str r2, [r1, #MSC0_OFFSET]
154 ldr r2, [r1, #MSC0_OFFSET] /* read back to ensure */
155 /* that data latches */
157 ldr r2, =CONFIG_SYS_MSC1_VAL
158 str r2, [r1, #MSC1_OFFSET]
159 ldr r2, [r1, #MSC1_OFFSET]
162 ldr r2, =CONFIG_SYS_MSC2_VAL
163 str r2, [r1, #MSC2_OFFSET]
164 ldr r2, [r1, #MSC2_OFFSET]
166 /* ---------------------------------------------------------------- */
167 /* Step 2b: Initialize Card Interface */
168 /* ---------------------------------------------------------------- */
170 /* MECR: Memory Expansion Card Register */
171 ldr r2, =CONFIG_SYS_MECR_VAL
172 str r2, [r1, #MECR_OFFSET]
173 ldr r2, [r1, #MECR_OFFSET]
175 /* MCMEM0: Card Interface slot 0 timing */
176 ldr r2, =CONFIG_SYS_MCMEM0_VAL
177 str r2, [r1, #MCMEM0_OFFSET]
178 ldr r2, [r1, #MCMEM0_OFFSET]
180 /* MCMEM1: Card Interface slot 1 timing */
181 ldr r2, =CONFIG_SYS_MCMEM1_VAL
182 str r2, [r1, #MCMEM1_OFFSET]
183 ldr r2, [r1, #MCMEM1_OFFSET]
185 /* MCATT0: Card Interface Attribute Space Timing, slot 0 */
186 ldr r2, =CONFIG_SYS_MCATT0_VAL
187 str r2, [r1, #MCATT0_OFFSET]
188 ldr r2, [r1, #MCATT0_OFFSET]
190 /* MCATT1: Card Interface Attribute Space Timing, slot 1 */
191 ldr r2, =CONFIG_SYS_MCATT1_VAL
192 str r2, [r1, #MCATT1_OFFSET]
193 ldr r2, [r1, #MCATT1_OFFSET]
195 /* MCIO0: Card Interface I/O Space Timing, slot 0 */
196 ldr r2, =CONFIG_SYS_MCIO0_VAL
197 str r2, [r1, #MCIO0_OFFSET]
198 ldr r2, [r1, #MCIO0_OFFSET]
200 /* MCIO1: Card Interface I/O Space Timing, slot 1 */
201 ldr r2, =CONFIG_SYS_MCIO1_VAL
202 str r2, [r1, #MCIO1_OFFSET]
203 ldr r2, [r1, #MCIO1_OFFSET]
205 /* ---------------------------------------------------------------- */
206 /* Step 2c: Write FLYCNFG FIXME: what's that??? */
207 /* ---------------------------------------------------------------- */
210 /* ---------------------------------------------------------------- */
211 /* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
212 /* ---------------------------------------------------------------- */
214 /* Before accessing MDREFR we need a valid DRI field, so we set */
215 /* this to power on defaults + DRI field. */
217 ldr r3, =CONFIG_SYS_MDREFR_VAL
222 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
223 ldr r4, [r1, #MDREFR_OFFSET]
225 /* Note: preserve the mdrefr value in r4 */
228 /* ---------------------------------------------------------------- */
229 /* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
230 /* ---------------------------------------------------------------- */
232 /* Initialize SXCNFG register. Assert the enable bits */
234 /* Write SXMRS to cause an MRS command to all enabled banks of */
235 /* synchronous static memory. Note that SXLCR need not be written */
238 /* FIXME: we use async mode for now */
241 /* ---------------------------------------------------------------- */
242 /* Step 4: Initialize SDRAM */
243 /* ---------------------------------------------------------------- */
245 /* set MDREFR according to user define with exception of a few bits */
247 ldr r4, =CONFIG_SYS_MDREFR_VAL
248 orr r4, r4, #(MDREFR_SLFRSH)
249 bic r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN)
250 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
251 ldr r4, [r1, #MDREFR_OFFSET]
253 /* Step 4b: de-assert MDREFR:SLFRSH. */
255 bic r4, r4, #(MDREFR_SLFRSH)
256 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
257 ldr r4, [r1, #MDREFR_OFFSET]
260 /* Step 4c: assert MDREFR:E1PIN and E0PIO as desired */
262 ldr r4, =CONFIG_SYS_MDREFR_VAL
263 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
264 ldr r4, [r1, #MDREFR_OFFSET]
267 /* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
268 /* configure but not enable each SDRAM partition pair. */
270 ldr r4, =CONFIG_SYS_MDCNFG_VAL
271 bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
273 str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
274 ldr r4, [r1, #MDCNFG_OFFSET]
277 /* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
280 ldr r3, =OSCR /* reset the OS Timer Count to zero */
283 ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
284 /* so 0x300 should be plenty */
291 /* Step 4f: Trigger a number (usually 8) refresh cycles by */
292 /* attempting non-burst read or write accesses to disabled */
293 /* SDRAM, as commonly specified in the power up sequence */
294 /* documented in SDRAM data sheets. The address(es) used */
295 /* for this purpose must not be cacheable. */
297 ldr r3, =CONFIG_SYS_DRAM_BASE
308 /* Step 4g: Write MDCNFG with enable bits asserted */
309 /* (MDCNFG:DEx set to 1). */
311 ldr r3, [r1, #MDCNFG_OFFSET]
312 orr r3, r3, #(MDCNFG_DE0|MDCNFG_DE1)
313 str r3, [r1, #MDCNFG_OFFSET]
315 /* Step 4h: Write MDMRS. */
317 ldr r2, =CONFIG_SYS_MDMRS_VAL
318 str r2, [r1, #MDMRS_OFFSET]
321 /* We are finished with Intel's memory controller initialisation */
324 /* ---------------------------------------------------------------- */
325 /* Disable (mask) all interrupts at interrupt controller */
326 /* ---------------------------------------------------------------- */
330 mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
334 ldr r2, =ICMR /* mask all interrupts at the controller */
338 /* ---------------------------------------------------------------- */
339 /* Clock initialisation */
340 /* ---------------------------------------------------------------- */
344 /* Disable the peripheral clocks, and set the core clock frequency */
345 /* (hard-coding at 398.12MHz for now). */
347 /* Turn Off ALL on-chip peripheral clocks for re-configuration */
348 /* Note: See label 'ENABLECLKS' for the re-enabling */
354 /* default value in case no valid rotary switch setting is found */
355 ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
357 /* ... and write the core clock config register */
362 /* enable the 32Khz oscillator for RTC and PowerManager */
368 /* NOTE: spin here until OSCC.OOK get set, meaning the PLL */
376 /* ---------------------------------------------------------------- */
378 /* ---------------------------------------------------------------- */
380 /* Save SDRAM size */
384 /* Interrupt init: Mask all interrupts */
385 ldr r0, =ICMR /* enable no sources */
393 /*Disable software and data breakpoints */
395 mcr p15,0,r0,c14,c8,0 /* ibcr0 */
396 mcr p15,0,r0,c14,c9,0 /* ibcr1 */
397 mcr p15,0,r0,c14,c4,0 /* dbcon */
399 /*Enable all debug functionality */
401 mcr p14,0,r0,c10,c0,0 /* dcsr */
405 /* ---------------------------------------------------------------- */
406 /* End lowlevel_init */
407 /* ---------------------------------------------------------------- */