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>
24 #include <asm/machdep.h>
25 #include <asm/coldfire.h>
26 #include <asm/mcfsim.h>
27 #include <asm/mcfuart.h>
28 #include <asm/mcfdma.h>
29 #include <asm/mcfwdebug.h>
31 /***************************************************************************/
33 extern unsigned int mcf_timervector;
34 extern unsigned int mcf_profilevector;
35 extern unsigned int mcf_timerlevel;
37 /***************************************************************************/
39 static struct mcf_platform_uart m532x_uart_platform[] = {
41 .mapbase = MCFUART_BASE1,
42 .irq = MCFINT_VECBASE + MCFINT_UART0,
45 .mapbase = MCFUART_BASE2,
46 .irq = MCFINT_VECBASE + MCFINT_UART1,
49 .mapbase = MCFUART_BASE3,
50 .irq = MCFINT_VECBASE + MCFINT_UART2,
55 static struct platform_device m532x_uart = {
58 .dev.platform_data = m532x_uart_platform,
61 static struct resource m532x_fec_resources[] = {
65 .flags = IORESOURCE_MEM,
70 .flags = IORESOURCE_IRQ,
75 .flags = IORESOURCE_IRQ,
80 .flags = IORESOURCE_IRQ,
84 static struct platform_device m532x_fec = {
87 .num_resources = ARRAY_SIZE(m532x_fec_resources),
88 .resource = m532x_fec_resources,
90 static struct platform_device *m532x_devices[] __initdata = {
95 /***************************************************************************/
97 static void __init m532x_uart_init_line(int line, int irq)
100 /* GPIO initialization */
101 MCF_GPIO_PAR_UART |= 0x000F;
102 } else if (line == 1) {
103 /* GPIO initialization */
104 MCF_GPIO_PAR_UART |= 0x0FF0;
108 static void __init m532x_uarts_init(void)
110 const int nrlines = ARRAY_SIZE(m532x_uart_platform);
113 for (line = 0; (line < nrlines); line++)
114 m532x_uart_init_line(line, m532x_uart_platform[line].irq);
116 /***************************************************************************/
118 static void __init m532x_fec_init(void)
120 /* Set multi-function pins to ethernet mode for fec0 */
121 MCF_GPIO_PAR_FECI2C |= (MCF_GPIO_PAR_FECI2C_PAR_MDC_EMDC |
122 MCF_GPIO_PAR_FECI2C_PAR_MDIO_EMDIO);
123 MCF_GPIO_PAR_FEC = (MCF_GPIO_PAR_FEC_PAR_FEC_7W_FEC |
124 MCF_GPIO_PAR_FEC_PAR_FEC_MII_FEC);
127 /***************************************************************************/
129 void mcf_settimericr(unsigned int timer, unsigned int level)
133 /***************************************************************************/
135 static void m532x_cpu_reset(void)
138 __raw_writeb(MCF_RCR_SWRESET, MCF_RCR);
141 /***************************************************************************/
143 void __init config_BSP(char *commandp, int size)
145 #if !defined(CONFIG_BOOTPARAM)
146 /* Copy command line from FLASH to local buffer... */
147 memcpy(commandp, (char *) 0x4000, 4);
148 if(strncmp(commandp, "kcl ", 4) == 0){
149 memcpy(commandp, (char *) 0x4004, size);
150 commandp[size-1] = 0;
152 memset(commandp, 0, size);
156 mcf_timervector = 64+32;
157 mcf_profilevector = 64+33;
158 mach_reset = m532x_cpu_reset;
160 #ifdef CONFIG_BDM_DISABLE
162 * Disable the BDM clocking. This also turns off most of the rest of
163 * the BDM device. This is good for EMC reasons. This option is not
164 * incompatible with the memory protection option.
166 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
170 /***************************************************************************/
172 static int __init init_BSP(void)
176 platform_add_devices(m532x_devices, ARRAY_SIZE(m532x_devices));
180 arch_initcall(init_BSP);
182 /***************************************************************************/
183 /* Board initialization */
184 /***************************************************************************/
186 * PLL min/max specifications
188 #define MAX_FVCO 500000 /* KHz */
189 #define MAX_FSYS 80000 /* KHz */
190 #define MIN_FSYS 58333 /* KHz */
191 #define FREF 16000 /* KHz */
194 #define MAX_MFD 135 /* Multiplier */
195 #define MIN_MFD 88 /* Multiplier */
196 #define BUSDIV 6 /* Divider */
199 * Low Power Divider specifications
201 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
202 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
203 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
205 #define SYS_CLK_KHZ 80000
206 #define SYSTEM_PERIOD 12.5
208 * SDRAM Timing Parameters
210 #define SDRAM_BL 8 /* # of beats in a burst */
211 #define SDRAM_TWR 2 /* in clocks */
212 #define SDRAM_CASL 2.5 /* CASL in clocks */
213 #define SDRAM_TRCD 2 /* in clocks */
214 #define SDRAM_TRP 2 /* in clocks */
215 #define SDRAM_TRFC 7 /* in clocks */
216 #define SDRAM_TREFI 7800 /* in ns */
218 #define EXT_SRAM_ADDRESS (0xC0000000)
219 #define FLASH_ADDRESS (0x00000000)
220 #define SDRAM_ADDRESS (0x40000000)
222 #define NAND_FLASH_ADDRESS (0xD0000000)
229 void gpio_init(void);
230 void fbcs_init(void);
231 void sdramc_init(void);
232 int clock_pll (int fsys, int flags);
233 int clock_limp (int);
234 int clock_exit_limp (void);
235 int get_sys_clock (void);
237 asmlinkage void __init sysinit(void)
239 sys_clk_khz = clock_pll(0, 0);
240 sys_clk_mhz = sys_clk_khz/1000;
251 /* Disable watchdog timer */
255 #define MCF_SCM_BCR_GBW (0x00000100)
256 #define MCF_SCM_BCR_GBR (0x00000200)
260 /* All masters are trusted */
261 MCF_SCM_MPR = 0x77777777;
263 /* Allow supervisor/user, read/write, and trusted/untrusted
264 access to all slaves */
273 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
279 MCF_GPIO_PAR_CS = 0x0000003E;
281 /* Latch chip select */
282 MCF_FBCS1_CSAR = 0x10080000;
284 MCF_FBCS1_CSCR = 0x002A3780;
285 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
287 /* Initialize latch to drive signals to inactive states */
288 *((u16 *)(0x10080000)) = 0xFFFF;
291 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
292 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
295 | MCF_FBCS_CSCR_WS(1));
296 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
299 /* Boot Flash connected to FBCS0 */
300 MCF_FBCS0_CSAR = FLASH_ADDRESS;
301 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
305 | MCF_FBCS_CSCR_WS(7));
306 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
310 void sdramc_init(void)
313 * Check to see if the SDRAM has already been initialized
314 * by a run control tool
316 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
317 /* SDRAM chip select initialization */
319 /* Initialize SDRAM chip select */
320 MCF_SDRAMC_SDCS0 = (0
321 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
322 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
325 * Basic configuration and initialization
327 MCF_SDRAMC_SDCFG1 = (0
328 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
329 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
330 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
331 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
332 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
333 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
334 | MCF_SDRAMC_SDCFG1_WTLAT(3));
335 MCF_SDRAMC_SDCFG2 = (0
336 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
337 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
338 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
339 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
343 * Precharge and enable write to SDMR
346 | MCF_SDRAMC_SDCR_MODE_EN
347 | MCF_SDRAMC_SDCR_CKE
348 | MCF_SDRAMC_SDCR_DDR
349 | MCF_SDRAMC_SDCR_MUX(1)
350 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
351 | MCF_SDRAMC_SDCR_PS_16
352 | MCF_SDRAMC_SDCR_IPALL);
355 * Write extended mode register
358 | MCF_SDRAMC_SDMR_BNKAD_LEMR
359 | MCF_SDRAMC_SDMR_AD(0x0)
360 | MCF_SDRAMC_SDMR_CMD);
363 * Write mode register and reset DLL
366 | MCF_SDRAMC_SDMR_BNKAD_LMR
367 | MCF_SDRAMC_SDMR_AD(0x163)
368 | MCF_SDRAMC_SDMR_CMD);
371 * Execute a PALL command
373 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
376 * Perform two REF cycles
378 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
379 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
382 * Write mode register and clear reset DLL
385 | MCF_SDRAMC_SDMR_BNKAD_LMR
386 | MCF_SDRAMC_SDMR_AD(0x063)
387 | MCF_SDRAMC_SDMR_CMD);
390 * Enable auto refresh and lock SDMR
392 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
393 MCF_SDRAMC_SDCR |= (0
394 | MCF_SDRAMC_SDCR_REF
395 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
401 /* Enable UART0 pins */
402 MCF_GPIO_PAR_UART = ( 0
403 | MCF_GPIO_PAR_UART_PAR_URXD0
404 | MCF_GPIO_PAR_UART_PAR_UTXD0);
406 /* Initialize TIN3 as a GPIO output to enable the write
408 MCF_GPIO_PAR_TIMER = 0x00;
409 __raw_writeb(0x08, MCFGPIO_PDDR_TIMER);
410 __raw_writeb(0x00, MCFGPIO_PCLRR_TIMER);
414 int clock_pll(int fsys, int flags)
416 int fref, temp, fout, mfd;
422 /* Return current PLL output */
425 return (fref * mfd / (BUSDIV * 4));
428 /* Check bounds of requested system clock */
434 /* Multiplying by 100 when calculating the temp value,
435 and then dividing by 100 to calculate the mfd allows
436 for exact values without needing to include floating
438 temp = 100 * fsys / fref;
439 mfd = 4 * BUSDIV * temp / 100;
441 /* Determine the output frequency for selected values */
442 fout = (fref * mfd / (BUSDIV * 4));
445 * Check to see if the SDRAM has already been initialized.
446 * If it has then the SDRAM needs to be put into self refresh
447 * mode before reprogramming the PLL.
449 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
450 /* Put SDRAM into self refresh mode */
451 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
454 * Initialize the PLL to generate the new system clock frequency.
455 * The device must be put into LIMP mode to reprogram the PLL.
458 /* Enter LIMP mode */
459 clock_limp(DEFAULT_LPD);
461 /* Reprogram PLL for desired fsys */
463 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
464 | MCF_PLL_PODR_BUSDIV(BUSDIV));
472 * Return the SDRAM to normal operation if it is in use.
474 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
475 /* Exit self refresh mode */
476 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
478 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
479 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
481 /* wait for DQS logic to relock */
482 for (i = 0; i < 0x200; i++)
488 int clock_limp(int div)
492 /* Check bounds of divider */
498 /* Save of the current value of the SSIDIV so we don't
499 overwrite the value*/
500 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
502 /* Apply the divider to the system clock */
504 | MCF_CCM_CDR_LPDIV(div)
505 | MCF_CCM_CDR_SSIDIV(temp));
507 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
509 return (FREF/(3*(1 << div)));
512 int clock_exit_limp(void)
517 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
519 /* Wait for PLL to lock */
520 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
523 fout = get_sys_clock();
528 int get_sys_clock(void)
532 /* Test to see if device is in LIMP mode */
533 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
534 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
535 return (FREF/(2 << divider));
538 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));