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/memsetup.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 CFG_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, =CFG_GPSR0_VAL
58 ldr r1, =CFG_GPSR1_VAL
62 ldr r1, =CFG_GPSR2_VAL
66 ldr r1, =CFG_GPCR0_VAL
70 ldr r1, =CFG_GPCR1_VAL
74 ldr r1, =CFG_GPCR2_VAL
78 ldr r1, =CFG_GPDR0_VAL
82 ldr r1, =CFG_GPDR1_VAL
86 ldr r1, =CFG_GPDR2_VAL
90 ldr r1, =CFG_GAFR0_L_VAL
94 ldr r1, =CFG_GAFR0_U_VAL
98 ldr r1, =CFG_GAFR1_L_VAL
102 ldr r1, =CFG_GAFR1_U_VAL
106 ldr r1, =CFG_GAFR2_L_VAL
110 ldr r1, =CFG_GAFR2_U_VAL
113 ldr r0, =PSSR /* enable GPIO pins */
114 ldr r1, =CFG_PSSR_VAL
117 /* ldr r3, =MSC1 / low - bank 2 Lubbock Registers / SRAM */
118 /* ldr r2, =CFG_MSC1_VAL / high - bank 3 Ethernet Controller */
119 /* str r2, [r3] / need to set MSC1 before trying to write to the HEX LEDs */
120 /* ldr r2, [r3] / need to read it back to make sure the value latches (see MSC section of manual) */
122 /* ldr r1, =LED_BLANK */
124 /* str r0, [r1] / turn on hex leds */
128 /* ldr r0, =0xB0070001 */
130 /* str r0, [r1] / hex display */
133 /* ---------------------------------------------------------------- */
134 /* Enable memory interface */
136 /* The sequence below is based on the recommended init steps */
137 /* detailed in the Intel PXA250 Operating Systems Developers Guide, */
139 /* ---------------------------------------------------------------- */
141 /* ---------------------------------------------------------------- */
142 /* Step 1: Wait for at least 200 microsedonds to allow internal */
143 /* clocks to settle. Only necessary after hard reset... */
144 /* FIXME: can be optimized later */
145 /* ---------------------------------------------------------------- */
147 ldr r3, =OSCR /* reset the OS Timer Count to zero */
150 ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
151 /* so 0x300 should be plenty */
159 ldr r1, =MEMC_BASE /* get memory controller base addr. */
161 /* ---------------------------------------------------------------- */
162 /* Step 2a: Initialize Asynchronous static memory controller */
163 /* ---------------------------------------------------------------- */
165 /* MSC registers: timing, bus width, mem type */
168 ldr r2, =CFG_MSC0_VAL
169 str r2, [r1, #MSC0_OFFSET]
170 ldr r2, [r1, #MSC0_OFFSET] /* read back to ensure */
171 /* that data latches */
173 ldr r2, =CFG_MSC1_VAL
174 str r2, [r1, #MSC1_OFFSET]
175 ldr r2, [r1, #MSC1_OFFSET]
178 ldr r2, =CFG_MSC2_VAL
179 str r2, [r1, #MSC2_OFFSET]
180 ldr r2, [r1, #MSC2_OFFSET]
182 /* ---------------------------------------------------------------- */
183 /* Step 2b: Initialize Card Interface */
184 /* ---------------------------------------------------------------- */
186 /* MECR: Memory Expansion Card Register */
187 ldr r2, =CFG_MECR_VAL
188 str r2, [r1, #MECR_OFFSET]
189 ldr r2, [r1, #MECR_OFFSET]
191 /* MCMEM0: Card Interface slot 0 timing */
192 ldr r2, =CFG_MCMEM0_VAL
193 str r2, [r1, #MCMEM0_OFFSET]
194 ldr r2, [r1, #MCMEM0_OFFSET]
196 /* MCMEM1: Card Interface slot 1 timing */
197 ldr r2, =CFG_MCMEM1_VAL
198 str r2, [r1, #MCMEM1_OFFSET]
199 ldr r2, [r1, #MCMEM1_OFFSET]
201 /* MCATT0: Card Interface Attribute Space Timing, slot 0 */
202 ldr r2, =CFG_MCATT0_VAL
203 str r2, [r1, #MCATT0_OFFSET]
204 ldr r2, [r1, #MCATT0_OFFSET]
206 /* MCATT1: Card Interface Attribute Space Timing, slot 1 */
207 ldr r2, =CFG_MCATT1_VAL
208 str r2, [r1, #MCATT1_OFFSET]
209 ldr r2, [r1, #MCATT1_OFFSET]
211 /* MCIO0: Card Interface I/O Space Timing, slot 0 */
212 ldr r2, =CFG_MCIO0_VAL
213 str r2, [r1, #MCIO0_OFFSET]
214 ldr r2, [r1, #MCIO0_OFFSET]
216 /* MCIO1: Card Interface I/O Space Timing, slot 1 */
217 ldr r2, =CFG_MCIO1_VAL
218 str r2, [r1, #MCIO1_OFFSET]
219 ldr r2, [r1, #MCIO1_OFFSET]
221 /* ---------------------------------------------------------------- */
222 /* Step 2c: Write FLYCNFG FIXME: what's that??? */
223 /* ---------------------------------------------------------------- */
226 /* ---------------------------------------------------------------- */
227 /* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
228 /* ---------------------------------------------------------------- */
230 /* Before accessing MDREFR we need a valid DRI field, so we set */
231 /* this to power on defaults + DIR field. */
234 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
235 ldr r4, [r1, #MDREFR_OFFSET]
238 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
239 ldr r4, [r1, #MDREFR_OFFSET]
241 /* Note: preserve the mdrefr value in r4 */
244 /* ---------------------------------------------------------------- */
245 /* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
246 /* ---------------------------------------------------------------- */
248 /* Initialize SXCNFG register. Assert the enable bits */
250 /* Write SXMRS to cause an MRS command to all enabled banks of */
251 /* synchronous static memory. Note that SXLCR need not be written */
254 /* FIXME: we use async mode for now */
257 /* ---------------------------------------------------------------- */
258 /* Step 4: Initialize SDRAM */
259 /* ---------------------------------------------------------------- */
261 /* Step 4a: assert MDREFR:K1RUN and MDREFR:K2RUN and configure */
262 /* MDREFR:K1DB2 and MDREFR:K2DB2 as desired. */
264 orr r4, r4, #(MDREFR_K1RUN|MDREFR_K0RUN)
266 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
267 ldr r4, [r1, #MDREFR_OFFSET]
270 /* Step 4b: de-assert MDREFR:SLFRSH. */
272 bic r4, r4, #(MDREFR_SLFRSH)
274 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
275 ldr r4, [r1, #MDREFR_OFFSET]
278 /* Step 4c: assert MDREFR:E1PIN and E0PIO */
280 orr r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN)
282 str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
283 ldr r4, [r1, #MDREFR_OFFSET]
286 /* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
287 /* configure but not enable each SDRAM partition pair. */
289 ldr r4, =CFG_MDCNFG_VAL
290 bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
292 str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
293 ldr r4, [r1, #MDCNFG_OFFSET]
296 /* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
299 ldr r3, =OSCR /* reset the OS Timer Count to zero */
302 ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
303 /* so 0x300 should be plenty */
310 /* Step 4f: Trigger a number (usually 8) refresh cycles by */
311 /* attempting non-burst read or write accesses to disabled */
312 /* SDRAM, as commonly specified in the power up sequence */
313 /* documented in SDRAM data sheets. The address(es) used */
314 /* for this purpose must not be cacheable. */
316 ldr r3, =CFG_DRAM_BASE
327 /* Step 4g: Write MDCNFG with enable bits asserted */
328 /* (MDCNFG:DEx set to 1). */
330 ldr r3, [r1, #MDCNFG_OFFSET]
331 orr r3, r3, #(MDCNFG_DE0|MDCNFG_DE1)
332 str r3, [r1, #MDCNFG_OFFSET]
334 /* Step 4h: Write MDMRS. */
336 ldr r2, =CFG_MDMRS_VAL
337 str r2, [r1, #MDMRS_OFFSET]
340 /* We are finished with Intel's memory controller initialisation */
343 /* ---------------------------------------------------------------- */
344 /* Disable (mask) all interrupts at interrupt controller */
345 /* ---------------------------------------------------------------- */
349 mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
353 ldr r2, =ICMR /* mask all interrupts at the controller */
357 /* ---------------------------------------------------------------- */
358 /* Clock initialisation */
359 /* ---------------------------------------------------------------- */
363 /* Disable the peripheral clocks, and set the core clock frequency */
364 /* (hard-coding at 398.12MHz for now). */
366 /* Turn Off ALL on-chip peripheral clocks for re-configuration */
367 /* Note: See label 'ENABLECLKS' for the re-enabling */
373 /* default value in case no valid rotary switch setting is found */
374 ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
376 /* ... and write the core clock config register */
380 /* enable the 32Khz oscillator for RTC and PowerManager */
386 /* NOTE: spin here until OSCC.OOK get set, meaning the PLL */
393 /* ---------------------------------------------------------------- */
395 /* ---------------------------------------------------------------- */
397 /* Save SDRAM size */
401 /* Interrupt init: Mask all interrupts */
402 ldr r0, =ICMR /* enable no sources */
410 /*Disable software and data breakpoints */
412 mcr p15,0,r0,c14,c8,0 /* ibcr0 */
413 mcr p15,0,r0,c14,c9,0 /* ibcr1 */
414 mcr p15,0,r0,c14,c4,0 /* dbcon */
416 /*Enable all debug functionality */
418 mcr p14,0,r0,c10,c0,0 /* dcsr */
422 /* ---------------------------------------------------------------- */
424 /* ---------------------------------------------------------------- */