1 /***************************************************************************/
4 * linux/arch/m68knommu/platform/532x/config.c
6 * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
7 * Copyright (C) 2000, Lineo (www.lineo.com)
8 * Yaroslav Vinogradov yaroslav.vinogradov@freescale.com
9 * Copyright Freescale Semiconductor, Inc 2006
10 * Copyright (c) 2006, emlix, Sebastian Hess <sh@emlix.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
18 /***************************************************************************/
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/param.h>
23 #include <linux/init.h>
24 #include <linux/interrupt.h>
27 #include <asm/traps.h>
28 #include <asm/machdep.h>
29 #include <asm/coldfire.h>
30 #include <asm/mcftimer.h>
31 #include <asm/mcfsim.h>
32 #include <asm/mcfdma.h>
33 #include <asm/mcfwdebug.h>
35 /***************************************************************************/
37 void coldfire_tick(void);
38 void coldfire_timer_init(irq_handler_t handler);
39 unsigned long coldfire_timer_offset(void);
40 void coldfire_trap_init(void);
41 void coldfire_reset(void);
43 extern unsigned int mcf_timervector;
44 extern unsigned int mcf_profilevector;
45 extern unsigned int mcf_timerlevel;
47 /***************************************************************************/
50 * DMA channel base address table.
52 unsigned int dma_base_addr[MAX_M68K_DMA_CHANNELS] = { };
53 unsigned int dma_device_address[MAX_M68K_DMA_CHANNELS];
55 /***************************************************************************/
57 void mcf_settimericr(unsigned int timer, unsigned int level)
59 volatile unsigned char *icrp;
65 case 2: irq = 33; icr = MCFSIM_ICR_TIMER2; break;
66 default: irq = 32; icr = MCFSIM_ICR_TIMER1; break;
69 icrp = (volatile unsigned char *) (MCF_MBAR + icr);
75 /***************************************************************************/
77 int mcf_timerirqpending(int timer)
82 case 1: imr = 0x1; break;
83 case 2: imr = 0x2; break;
86 return (mcf_getiprh() & imr);
89 /***************************************************************************/
91 void config_BSP(char *commandp, int size)
93 mcf_setimr(MCFSIM_IMR_MASKALL);
95 #if !defined(CONFIG_BOOTPARAM)
96 /* Copy command line from FLASH to local buffer... */
97 memcpy(commandp, (char *) 0x4000, 4);
98 if(strncmp(commandp, "kcl ", 4) == 0){
99 memcpy(commandp, (char *) 0x4004, size);
100 commandp[size-1] = 0;
102 memset(commandp, 0, size);
106 mcf_timervector = 64+32;
107 mcf_profilevector = 64+33;
108 mach_sched_init = coldfire_timer_init;
109 mach_tick = coldfire_tick;
110 mach_gettimeoffset = coldfire_timer_offset;
111 mach_trap_init = coldfire_trap_init;
112 mach_reset = coldfire_reset;
114 #ifdef MCF_BDM_DISABLE
116 * Disable the BDM clocking. This also turns off most of the rest of
117 * the BDM device. This is good for EMC reasons. This option is not
118 * incompatible with the memory protection option.
120 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
124 /***************************************************************************/
125 /* Board initialization */
127 /********************************************************************/
129 * PLL min/max specifications
131 #define MAX_FVCO 500000 /* KHz */
132 #define MAX_FSYS 80000 /* KHz */
133 #define MIN_FSYS 58333 /* KHz */
134 #define FREF 16000 /* KHz */
137 #define MAX_MFD 135 /* Multiplier */
138 #define MIN_MFD 88 /* Multiplier */
139 #define BUSDIV 6 /* Divider */
142 * Low Power Divider specifications
144 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
145 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
146 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
148 #define SYS_CLK_KHZ 80000
149 #define SYSTEM_PERIOD 12.5
151 * SDRAM Timing Parameters
153 #define SDRAM_BL 8 /* # of beats in a burst */
154 #define SDRAM_TWR 2 /* in clocks */
155 #define SDRAM_CASL 2.5 /* CASL in clocks */
156 #define SDRAM_TRCD 2 /* in clocks */
157 #define SDRAM_TRP 2 /* in clocks */
158 #define SDRAM_TRFC 7 /* in clocks */
159 #define SDRAM_TREFI 7800 /* in ns */
161 #define EXT_SRAM_ADDRESS (0xC0000000)
162 #define FLASH_ADDRESS (0x00000000)
163 #define SDRAM_ADDRESS (0x40000000)
165 #define NAND_FLASH_ADDRESS (0xD0000000)
172 void gpio_init(void);
173 void fbcs_init(void);
174 void sdramc_init(void);
175 int clock_pll (int fsys, int flags);
176 int clock_limp (int);
177 int clock_exit_limp (void);
178 int get_sys_clock (void);
180 asmlinkage void __init sysinit(void)
182 sys_clk_khz = clock_pll(0, 0);
183 sys_clk_mhz = sys_clk_khz/1000;
194 /* Disable watchdog timer */
198 #define MCF_SCM_BCR_GBW (0x00000100)
199 #define MCF_SCM_BCR_GBR (0x00000200)
203 /* All masters are trusted */
204 MCF_SCM_MPR = 0x77777777;
206 /* Allow supervisor/user, read/write, and trusted/untrusted
207 access to all slaves */
216 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
222 MCF_GPIO_PAR_CS = 0x0000003E;
224 /* Latch chip select */
225 MCF_FBCS1_CSAR = 0x10080000;
227 MCF_FBCS1_CSCR = 0x002A3780;
228 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
230 /* Initialize latch to drive signals to inactive states */
231 *((u16 *)(0x10080000)) = 0xFFFF;
234 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
235 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
238 | MCF_FBCS_CSCR_WS(1));
239 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
242 /* Boot Flash connected to FBCS0 */
243 MCF_FBCS0_CSAR = FLASH_ADDRESS;
244 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
248 | MCF_FBCS_CSCR_WS(7));
249 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
253 void sdramc_init(void)
256 * Check to see if the SDRAM has already been initialized
257 * by a run control tool
259 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
260 /* SDRAM chip select initialization */
262 /* Initialize SDRAM chip select */
263 MCF_SDRAMC_SDCS0 = (0
264 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
265 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
268 * Basic configuration and initialization
270 MCF_SDRAMC_SDCFG1 = (0
271 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
272 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
273 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
274 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
275 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
276 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
277 | MCF_SDRAMC_SDCFG1_WTLAT(3));
278 MCF_SDRAMC_SDCFG2 = (0
279 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
280 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
281 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
282 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
286 * Precharge and enable write to SDMR
289 | MCF_SDRAMC_SDCR_MODE_EN
290 | MCF_SDRAMC_SDCR_CKE
291 | MCF_SDRAMC_SDCR_DDR
292 | MCF_SDRAMC_SDCR_MUX(1)
293 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
294 | MCF_SDRAMC_SDCR_PS_16
295 | MCF_SDRAMC_SDCR_IPALL);
298 * Write extended mode register
301 | MCF_SDRAMC_SDMR_BNKAD_LEMR
302 | MCF_SDRAMC_SDMR_AD(0x0)
303 | MCF_SDRAMC_SDMR_CMD);
306 * Write mode register and reset DLL
309 | MCF_SDRAMC_SDMR_BNKAD_LMR
310 | MCF_SDRAMC_SDMR_AD(0x163)
311 | MCF_SDRAMC_SDMR_CMD);
314 * Execute a PALL command
316 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
319 * Perform two REF cycles
321 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
322 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
325 * Write mode register and clear reset DLL
328 | MCF_SDRAMC_SDMR_BNKAD_LMR
329 | MCF_SDRAMC_SDMR_AD(0x063)
330 | MCF_SDRAMC_SDMR_CMD);
333 * Enable auto refresh and lock SDMR
335 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
336 MCF_SDRAMC_SDCR |= (0
337 | MCF_SDRAMC_SDCR_REF
338 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
344 /* Enable UART0 pins */
345 MCF_GPIO_PAR_UART = ( 0
346 | MCF_GPIO_PAR_UART_PAR_URXD0
347 | MCF_GPIO_PAR_UART_PAR_UTXD0);
349 /* Initialize TIN3 as a GPIO output to enable the write
351 MCF_GPIO_PAR_TIMER = 0x00;
352 MCF_GPIO_PDDR_TIMER = 0x08;
353 MCF_GPIO_PCLRR_TIMER = 0x0;
357 int clock_pll(int fsys, int flags)
359 int fref, temp, fout, mfd;
365 /* Return current PLL output */
368 return (fref * mfd / (BUSDIV * 4));
371 /* Check bounds of requested system clock */
377 /* Multiplying by 100 when calculating the temp value,
378 and then dividing by 100 to calculate the mfd allows
379 for exact values without needing to include floating
381 temp = 100 * fsys / fref;
382 mfd = 4 * BUSDIV * temp / 100;
384 /* Determine the output frequency for selected values */
385 fout = (fref * mfd / (BUSDIV * 4));
388 * Check to see if the SDRAM has already been initialized.
389 * If it has then the SDRAM needs to be put into self refresh
390 * mode before reprogramming the PLL.
392 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
393 /* Put SDRAM into self refresh mode */
394 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
397 * Initialize the PLL to generate the new system clock frequency.
398 * The device must be put into LIMP mode to reprogram the PLL.
401 /* Enter LIMP mode */
402 clock_limp(DEFAULT_LPD);
404 /* Reprogram PLL for desired fsys */
406 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
407 | MCF_PLL_PODR_BUSDIV(BUSDIV));
415 * Return the SDRAM to normal operation if it is in use.
417 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
418 /* Exit self refresh mode */
419 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
421 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
422 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
424 /* wait for DQS logic to relock */
425 for (i = 0; i < 0x200; i++)
431 int clock_limp(int div)
435 /* Check bounds of divider */
441 /* Save of the current value of the SSIDIV so we don't
442 overwrite the value*/
443 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
445 /* Apply the divider to the system clock */
447 | MCF_CCM_CDR_LPDIV(div)
448 | MCF_CCM_CDR_SSIDIV(temp));
450 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
452 return (FREF/(3*(1 << div)));
455 int clock_exit_limp(void)
460 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
462 /* Wait for PLL to lock */
463 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
466 fout = get_sys_clock();
471 int get_sys_clock(void)
475 /* Test to see if device is in LIMP mode */
476 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
477 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
478 return (FREF/(2 << divider));
481 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));