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/config.h>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/param.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
28 #include <asm/traps.h>
29 #include <asm/machdep.h>
30 #include <asm/coldfire.h>
31 #include <asm/mcftimer.h>
32 #include <asm/mcfsim.h>
33 #include <asm/mcfdma.h>
34 #include <asm/mcfwdebug.h>
36 /***************************************************************************/
38 void coldfire_tick(void);
39 void coldfire_timer_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
40 unsigned long coldfire_timer_offset(void);
41 void coldfire_trap_init(void);
42 void coldfire_reset(void);
44 extern unsigned int mcf_timervector;
45 extern unsigned int mcf_profilevector;
46 extern unsigned int mcf_timerlevel;
48 /***************************************************************************/
51 * DMA channel base address table.
53 unsigned int dma_base_addr[MAX_M68K_DMA_CHANNELS] = { };
54 unsigned int dma_device_address[MAX_M68K_DMA_CHANNELS];
56 /***************************************************************************/
58 void mcf_settimericr(unsigned int timer, unsigned int level)
60 volatile unsigned char *icrp;
66 case 2: irq = 33; icr = MCFSIM_ICR_TIMER2; break;
67 default: irq = 32; icr = MCFSIM_ICR_TIMER1; break;
70 icrp = (volatile unsigned char *) (MCF_MBAR + icr);
76 /***************************************************************************/
78 int mcf_timerirqpending(int timer)
83 case 1: imr = 0x1; break;
84 case 2: imr = 0x2; break;
87 return (mcf_getiprh() & imr);
90 /***************************************************************************/
92 void config_BSP(char *commandp, int size)
94 mcf_setimr(MCFSIM_IMR_MASKALL);
96 #if defined(CONFIG_BOOTPARAM)
97 strncpy(commandp, CONFIG_BOOTPARAM_STRING, size);
100 /* Copy command line from FLASH to local buffer... */
101 memcpy(commandp, (char *) 0x4000, 4);
102 if(strncmp(commandp, "kcl ", 4) == 0){
103 memcpy(commandp, (char *) 0x4004, size);
104 commandp[size-1] = 0;
106 memset(commandp, 0, size);
110 mcf_timervector = 64+32;
111 mcf_profilevector = 64+33;
112 mach_sched_init = coldfire_timer_init;
113 mach_tick = coldfire_tick;
114 mach_gettimeoffset = coldfire_timer_offset;
115 mach_trap_init = coldfire_trap_init;
116 mach_reset = coldfire_reset;
118 #ifdef MCF_BDM_DISABLE
120 * Disable the BDM clocking. This also turns off most of the rest of
121 * the BDM device. This is good for EMC reasons. This option is not
122 * incompatible with the memory protection option.
124 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
128 /***************************************************************************/
129 /* Board initialization */
131 /********************************************************************/
133 * PLL min/max specifications
135 #define MAX_FVCO 500000 /* KHz */
136 #define MAX_FSYS 80000 /* KHz */
137 #define MIN_FSYS 58333 /* KHz */
138 #define FREF 16000 /* KHz */
141 #define MAX_MFD 135 /* Multiplier */
142 #define MIN_MFD 88 /* Multiplier */
143 #define BUSDIV 6 /* Divider */
146 * Low Power Divider specifications
148 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
149 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
150 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
152 #define SYS_CLK_KHZ 80000
153 #define SYSTEM_PERIOD 12.5
155 * SDRAM Timing Parameters
157 #define SDRAM_BL 8 /* # of beats in a burst */
158 #define SDRAM_TWR 2 /* in clocks */
159 #define SDRAM_CASL 2.5 /* CASL in clocks */
160 #define SDRAM_TRCD 2 /* in clocks */
161 #define SDRAM_TRP 2 /* in clocks */
162 #define SDRAM_TRFC 7 /* in clocks */
163 #define SDRAM_TREFI 7800 /* in ns */
165 #define EXT_SRAM_ADDRESS (0xC0000000)
166 #define FLASH_ADDRESS (0x00000000)
167 #define SDRAM_ADDRESS (0x40000000)
169 #define NAND_FLASH_ADDRESS (0xD0000000)
176 void gpio_init(void);
177 void fbcs_init(void);
178 void sdramc_init(void);
179 int clock_pll (int fsys, int flags);
180 int clock_limp (int);
181 int clock_exit_limp (void);
182 int get_sys_clock (void);
184 asmlinkage void __init sysinit(void)
186 sys_clk_khz = clock_pll(0, 0);
187 sys_clk_mhz = sys_clk_khz/1000;
198 /* Disable watchdog timer */
202 #define MCF_SCM_BCR_GBW (0x00000100)
203 #define MCF_SCM_BCR_GBR (0x00000200)
207 /* All masters are trusted */
208 MCF_SCM_MPR = 0x77777777;
210 /* Allow supervisor/user, read/write, and trusted/untrusted
211 access to all slaves */
220 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
226 MCF_GPIO_PAR_CS = 0x0000003E;
228 /* Latch chip select */
229 MCF_FBCS1_CSAR = 0x10080000;
231 MCF_FBCS1_CSCR = 0x002A3780;
232 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
234 /* Initialize latch to drive signals to inactive states */
235 *((u16 *)(0x10080000)) = 0xFFFF;
238 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
239 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
242 | MCF_FBCS_CSCR_WS(1));
243 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
246 /* Boot Flash connected to FBCS0 */
247 MCF_FBCS0_CSAR = FLASH_ADDRESS;
248 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
252 | MCF_FBCS_CSCR_WS(7));
253 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
257 void sdramc_init(void)
260 * Check to see if the SDRAM has already been initialized
261 * by a run control tool
263 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
264 /* SDRAM chip select initialization */
266 /* Initialize SDRAM chip select */
267 MCF_SDRAMC_SDCS0 = (0
268 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
269 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
272 * Basic configuration and initialization
274 MCF_SDRAMC_SDCFG1 = (0
275 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
276 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
277 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
278 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
279 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
280 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
281 | MCF_SDRAMC_SDCFG1_WTLAT(3));
282 MCF_SDRAMC_SDCFG2 = (0
283 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
284 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
285 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
286 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
290 * Precharge and enable write to SDMR
293 | MCF_SDRAMC_SDCR_MODE_EN
294 | MCF_SDRAMC_SDCR_CKE
295 | MCF_SDRAMC_SDCR_DDR
296 | MCF_SDRAMC_SDCR_MUX(1)
297 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
298 | MCF_SDRAMC_SDCR_PS_16
299 | MCF_SDRAMC_SDCR_IPALL);
302 * Write extended mode register
305 | MCF_SDRAMC_SDMR_BNKAD_LEMR
306 | MCF_SDRAMC_SDMR_AD(0x0)
307 | MCF_SDRAMC_SDMR_CMD);
310 * Write mode register and reset DLL
313 | MCF_SDRAMC_SDMR_BNKAD_LMR
314 | MCF_SDRAMC_SDMR_AD(0x163)
315 | MCF_SDRAMC_SDMR_CMD);
318 * Execute a PALL command
320 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
323 * Perform two REF cycles
325 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
326 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
329 * Write mode register and clear reset DLL
332 | MCF_SDRAMC_SDMR_BNKAD_LMR
333 | MCF_SDRAMC_SDMR_AD(0x063)
334 | MCF_SDRAMC_SDMR_CMD);
337 * Enable auto refresh and lock SDMR
339 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
340 MCF_SDRAMC_SDCR |= (0
341 | MCF_SDRAMC_SDCR_REF
342 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
348 /* Enable UART0 pins */
349 MCF_GPIO_PAR_UART = ( 0
350 | MCF_GPIO_PAR_UART_PAR_URXD0
351 | MCF_GPIO_PAR_UART_PAR_UTXD0);
353 /* Initialize TIN3 as a GPIO output to enable the write
355 MCF_GPIO_PAR_TIMER = 0x00;
356 MCF_GPIO_PDDR_TIMER = 0x08;
357 MCF_GPIO_PCLRR_TIMER = 0x0;
361 int clock_pll(int fsys, int flags)
363 int fref, temp, fout, mfd;
369 /* Return current PLL output */
372 return (fref * mfd / (BUSDIV * 4));
375 /* Check bounds of requested system clock */
381 /* Multiplying by 100 when calculating the temp value,
382 and then dividing by 100 to calculate the mfd allows
383 for exact values without needing to include floating
385 temp = 100 * fsys / fref;
386 mfd = 4 * BUSDIV * temp / 100;
388 /* Determine the output frequency for selected values */
389 fout = (fref * mfd / (BUSDIV * 4));
392 * Check to see if the SDRAM has already been initialized.
393 * If it has then the SDRAM needs to be put into self refresh
394 * mode before reprogramming the PLL.
396 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
397 /* Put SDRAM into self refresh mode */
398 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
401 * Initialize the PLL to generate the new system clock frequency.
402 * The device must be put into LIMP mode to reprogram the PLL.
405 /* Enter LIMP mode */
406 clock_limp(DEFAULT_LPD);
408 /* Reprogram PLL for desired fsys */
410 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
411 | MCF_PLL_PODR_BUSDIV(BUSDIV));
419 * Return the SDRAM to normal operation if it is in use.
421 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
422 /* Exit self refresh mode */
423 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
425 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
426 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
428 /* wait for DQS logic to relock */
429 for (i = 0; i < 0x200; i++)
435 int clock_limp(int div)
439 /* Check bounds of divider */
445 /* Save of the current value of the SSIDIV so we don't
446 overwrite the value*/
447 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
449 /* Apply the divider to the system clock */
451 | MCF_CCM_CDR_LPDIV(div)
452 | MCF_CCM_CDR_SSIDIV(temp));
454 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
456 return (FREF/(3*(1 << div)));
459 int clock_exit_limp(void)
464 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
466 /* Wait for PLL to lock */
467 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
470 fout = get_sys_clock();
475 int get_sys_clock(void)
479 /* Test to see if device is in LIMP mode */
480 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
481 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
482 return (FREF/(2 << divider));
485 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));