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/param.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
25 #include <asm/machdep.h>
26 #include <asm/coldfire.h>
27 #include <asm/mcfsim.h>
28 #include <asm/mcfuart.h>
29 #include <asm/mcfdma.h>
30 #include <asm/mcfwdebug.h>
32 /***************************************************************************/
34 void coldfire_reset(void);
36 extern unsigned int mcf_timervector;
37 extern unsigned int mcf_profilevector;
38 extern unsigned int mcf_timerlevel;
40 /***************************************************************************/
42 static struct mcf_platform_uart m532x_uart_platform[] = {
44 .mapbase = MCF_MBAR + MCFUART_BASE1,
45 .irq = MCFINT_VECBASE + MCFINT_UART0,
48 .mapbase = MCF_MBAR + MCFUART_BASE2,
49 .irq = MCFINT_VECBASE + MCFINT_UART1,
52 .mapbase = MCF_MBAR + MCFUART_BASE3,
53 .irq = MCFINT_VECBASE + MCFINT_UART2,
58 static struct platform_device m532x_uart = {
61 .dev.platform_data = m532x_uart_platform,
64 static struct platform_device *m532x_devices[] __initdata = {
68 /***************************************************************************/
70 static void __init m532x_uart_init_line(int line, int irq)
73 MCF_INTC0_ICR26 = 0x3;
75 /* GPIO initialization */
76 MCF_GPIO_PAR_UART |= 0x000F;
77 } else if (line == 1) {
78 MCF_INTC0_ICR27 = 0x3;
80 /* GPIO initialization */
81 MCF_GPIO_PAR_UART |= 0x0FF0;
82 } else if (line == 2) {
83 MCF_INTC0_ICR28 = 0x3;
88 static void __init m532x_uarts_init(void)
90 const int nrlines = ARRAY_SIZE(m532x_uart_platform);
93 for (line = 0; (line < nrlines); line++)
94 m532x_uart_init_line(line, m532x_uart_platform[line].irq);
97 /***************************************************************************/
99 void mcf_settimericr(unsigned int timer, unsigned int level)
101 volatile unsigned char *icrp;
107 case 2: irq = 33; icr = MCFSIM_ICR_TIMER2; break;
108 default: irq = 32; icr = MCFSIM_ICR_TIMER1; break;
111 icrp = (volatile unsigned char *) (MCF_MBAR + icr);
113 mcf_enable_irq0(irq);
117 /***************************************************************************/
119 void __init config_BSP(char *commandp, int size)
121 mcf_setimr(MCFSIM_IMR_MASKALL);
123 #if !defined(CONFIG_BOOTPARAM)
124 /* Copy command line from FLASH to local buffer... */
125 memcpy(commandp, (char *) 0x4000, 4);
126 if(strncmp(commandp, "kcl ", 4) == 0){
127 memcpy(commandp, (char *) 0x4004, size);
128 commandp[size-1] = 0;
130 memset(commandp, 0, size);
134 mcf_timervector = 64+32;
135 mcf_profilevector = 64+33;
136 mach_reset = coldfire_reset;
138 #ifdef CONFIG_BDM_DISABLE
140 * Disable the BDM clocking. This also turns off most of the rest of
141 * the BDM device. This is good for EMC reasons. This option is not
142 * incompatible with the memory protection option.
144 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
148 /***************************************************************************/
150 static int __init init_BSP(void)
153 platform_add_devices(m532x_devices, ARRAY_SIZE(m532x_devices));
157 arch_initcall(init_BSP);
159 /***************************************************************************/
160 /* Board initialization */
161 /***************************************************************************/
163 * PLL min/max specifications
165 #define MAX_FVCO 500000 /* KHz */
166 #define MAX_FSYS 80000 /* KHz */
167 #define MIN_FSYS 58333 /* KHz */
168 #define FREF 16000 /* KHz */
171 #define MAX_MFD 135 /* Multiplier */
172 #define MIN_MFD 88 /* Multiplier */
173 #define BUSDIV 6 /* Divider */
176 * Low Power Divider specifications
178 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
179 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
180 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
182 #define SYS_CLK_KHZ 80000
183 #define SYSTEM_PERIOD 12.5
185 * SDRAM Timing Parameters
187 #define SDRAM_BL 8 /* # of beats in a burst */
188 #define SDRAM_TWR 2 /* in clocks */
189 #define SDRAM_CASL 2.5 /* CASL in clocks */
190 #define SDRAM_TRCD 2 /* in clocks */
191 #define SDRAM_TRP 2 /* in clocks */
192 #define SDRAM_TRFC 7 /* in clocks */
193 #define SDRAM_TREFI 7800 /* in ns */
195 #define EXT_SRAM_ADDRESS (0xC0000000)
196 #define FLASH_ADDRESS (0x00000000)
197 #define SDRAM_ADDRESS (0x40000000)
199 #define NAND_FLASH_ADDRESS (0xD0000000)
206 void gpio_init(void);
207 void fbcs_init(void);
208 void sdramc_init(void);
209 int clock_pll (int fsys, int flags);
210 int clock_limp (int);
211 int clock_exit_limp (void);
212 int get_sys_clock (void);
214 asmlinkage void __init sysinit(void)
216 sys_clk_khz = clock_pll(0, 0);
217 sys_clk_mhz = sys_clk_khz/1000;
228 /* Disable watchdog timer */
232 #define MCF_SCM_BCR_GBW (0x00000100)
233 #define MCF_SCM_BCR_GBR (0x00000200)
237 /* All masters are trusted */
238 MCF_SCM_MPR = 0x77777777;
240 /* Allow supervisor/user, read/write, and trusted/untrusted
241 access to all slaves */
250 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
256 MCF_GPIO_PAR_CS = 0x0000003E;
258 /* Latch chip select */
259 MCF_FBCS1_CSAR = 0x10080000;
261 MCF_FBCS1_CSCR = 0x002A3780;
262 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
264 /* Initialize latch to drive signals to inactive states */
265 *((u16 *)(0x10080000)) = 0xFFFF;
268 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
269 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
272 | MCF_FBCS_CSCR_WS(1));
273 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
276 /* Boot Flash connected to FBCS0 */
277 MCF_FBCS0_CSAR = FLASH_ADDRESS;
278 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
282 | MCF_FBCS_CSCR_WS(7));
283 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
287 void sdramc_init(void)
290 * Check to see if the SDRAM has already been initialized
291 * by a run control tool
293 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
294 /* SDRAM chip select initialization */
296 /* Initialize SDRAM chip select */
297 MCF_SDRAMC_SDCS0 = (0
298 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
299 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
302 * Basic configuration and initialization
304 MCF_SDRAMC_SDCFG1 = (0
305 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
306 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
307 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
308 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
309 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
310 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
311 | MCF_SDRAMC_SDCFG1_WTLAT(3));
312 MCF_SDRAMC_SDCFG2 = (0
313 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
314 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
315 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
316 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
320 * Precharge and enable write to SDMR
323 | MCF_SDRAMC_SDCR_MODE_EN
324 | MCF_SDRAMC_SDCR_CKE
325 | MCF_SDRAMC_SDCR_DDR
326 | MCF_SDRAMC_SDCR_MUX(1)
327 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
328 | MCF_SDRAMC_SDCR_PS_16
329 | MCF_SDRAMC_SDCR_IPALL);
332 * Write extended mode register
335 | MCF_SDRAMC_SDMR_BNKAD_LEMR
336 | MCF_SDRAMC_SDMR_AD(0x0)
337 | MCF_SDRAMC_SDMR_CMD);
340 * Write mode register and reset DLL
343 | MCF_SDRAMC_SDMR_BNKAD_LMR
344 | MCF_SDRAMC_SDMR_AD(0x163)
345 | MCF_SDRAMC_SDMR_CMD);
348 * Execute a PALL command
350 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
353 * Perform two REF cycles
355 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
356 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
359 * Write mode register and clear reset DLL
362 | MCF_SDRAMC_SDMR_BNKAD_LMR
363 | MCF_SDRAMC_SDMR_AD(0x063)
364 | MCF_SDRAMC_SDMR_CMD);
367 * Enable auto refresh and lock SDMR
369 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
370 MCF_SDRAMC_SDCR |= (0
371 | MCF_SDRAMC_SDCR_REF
372 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
378 /* Enable UART0 pins */
379 MCF_GPIO_PAR_UART = ( 0
380 | MCF_GPIO_PAR_UART_PAR_URXD0
381 | MCF_GPIO_PAR_UART_PAR_UTXD0);
383 /* Initialize TIN3 as a GPIO output to enable the write
385 MCF_GPIO_PAR_TIMER = 0x00;
386 MCF_GPIO_PDDR_TIMER = 0x08;
387 MCF_GPIO_PCLRR_TIMER = 0x0;
391 int clock_pll(int fsys, int flags)
393 int fref, temp, fout, mfd;
399 /* Return current PLL output */
402 return (fref * mfd / (BUSDIV * 4));
405 /* Check bounds of requested system clock */
411 /* Multiplying by 100 when calculating the temp value,
412 and then dividing by 100 to calculate the mfd allows
413 for exact values without needing to include floating
415 temp = 100 * fsys / fref;
416 mfd = 4 * BUSDIV * temp / 100;
418 /* Determine the output frequency for selected values */
419 fout = (fref * mfd / (BUSDIV * 4));
422 * Check to see if the SDRAM has already been initialized.
423 * If it has then the SDRAM needs to be put into self refresh
424 * mode before reprogramming the PLL.
426 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
427 /* Put SDRAM into self refresh mode */
428 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
431 * Initialize the PLL to generate the new system clock frequency.
432 * The device must be put into LIMP mode to reprogram the PLL.
435 /* Enter LIMP mode */
436 clock_limp(DEFAULT_LPD);
438 /* Reprogram PLL for desired fsys */
440 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
441 | MCF_PLL_PODR_BUSDIV(BUSDIV));
449 * Return the SDRAM to normal operation if it is in use.
451 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
452 /* Exit self refresh mode */
453 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
455 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
456 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
458 /* wait for DQS logic to relock */
459 for (i = 0; i < 0x200; i++)
465 int clock_limp(int div)
469 /* Check bounds of divider */
475 /* Save of the current value of the SSIDIV so we don't
476 overwrite the value*/
477 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
479 /* Apply the divider to the system clock */
481 | MCF_CCM_CDR_LPDIV(div)
482 | MCF_CCM_CDR_SSIDIV(temp));
484 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
486 return (FREF/(3*(1 << div)));
489 int clock_exit_limp(void)
494 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
496 /* Wait for PLL to lock */
497 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
500 fout = get_sys_clock();
505 int get_sys_clock(void)
509 /* Test to see if device is in LIMP mode */
510 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
511 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
512 return (FREF/(2 << divider));
515 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));