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 <linux/spi/spi.h>
25 #include <linux/gpio.h>
26 #include <asm/machdep.h>
27 #include <asm/coldfire.h>
28 #include <asm/mcfsim.h>
29 #include <asm/mcfuart.h>
30 #include <asm/mcfdma.h>
31 #include <asm/mcfwdebug.h>
32 #include <asm/mcfqspi.h>
34 /***************************************************************************/
36 #if defined(CONFIG_SPI_COLDFIRE_QSPI) || defined(CONFIG_SPI_COLDFIRE_QSPI_MODULE)
37 static struct resource m532x_qspi_resources[] = {
39 .start = MCFQSPI_IOBASE,
40 .end = MCFQSPI_IOBASE + MCFQSPI_IOSIZE - 1,
41 .flags = IORESOURCE_MEM,
44 .start = MCFINT_VECBASE + MCFINT_QSPI,
45 .end = MCFINT_VECBASE + MCFINT_QSPI,
46 .flags = IORESOURCE_IRQ,
50 #define MCFQSPI_CS0 84
51 #define MCFQSPI_CS1 85
52 #define MCFQSPI_CS2 86
54 static int m532x_cs_setup(struct mcfqspi_cs_control *cs_control)
58 status = gpio_request(MCFQSPI_CS0, "MCFQSPI_CS0");
60 pr_debug("gpio_request for MCFQSPI_CS0 failed\n");
63 status = gpio_direction_output(MCFQSPI_CS0, 1);
65 pr_debug("gpio_direction_output for MCFQSPI_CS0 failed\n");
69 status = gpio_request(MCFQSPI_CS1, "MCFQSPI_CS1");
71 pr_debug("gpio_request for MCFQSPI_CS1 failed\n");
74 status = gpio_direction_output(MCFQSPI_CS1, 1);
76 pr_debug("gpio_direction_output for MCFQSPI_CS1 failed\n");
80 status = gpio_request(MCFQSPI_CS2, "MCFQSPI_CS2");
82 pr_debug("gpio_request for MCFQSPI_CS2 failed\n");
85 status = gpio_direction_output(MCFQSPI_CS2, 1);
87 pr_debug("gpio_direction_output for MCFQSPI_CS2 failed\n");
94 gpio_free(MCFQSPI_CS2);
96 gpio_free(MCFQSPI_CS1);
98 gpio_free(MCFQSPI_CS0);
103 static void m532x_cs_teardown(struct mcfqspi_cs_control *cs_control)
105 gpio_free(MCFQSPI_CS2);
106 gpio_free(MCFQSPI_CS1);
107 gpio_free(MCFQSPI_CS0);
110 static void m532x_cs_select(struct mcfqspi_cs_control *cs_control,
111 u8 chip_select, bool cs_high)
113 gpio_set_value(MCFQSPI_CS0 + chip_select, cs_high);
116 static void m532x_cs_deselect(struct mcfqspi_cs_control *cs_control,
117 u8 chip_select, bool cs_high)
119 gpio_set_value(MCFQSPI_CS0 + chip_select, !cs_high);
122 static struct mcfqspi_cs_control m532x_cs_control = {
123 .setup = m532x_cs_setup,
124 .teardown = m532x_cs_teardown,
125 .select = m532x_cs_select,
126 .deselect = m532x_cs_deselect,
129 static struct mcfqspi_platform_data m532x_qspi_data = {
132 .cs_control = &m532x_cs_control,
135 static struct platform_device m532x_qspi = {
138 .num_resources = ARRAY_SIZE(m532x_qspi_resources),
139 .resource = m532x_qspi_resources,
140 .dev.platform_data = &m532x_qspi_data,
143 static void __init m532x_qspi_init(void)
145 /* setup QSPS pins for QSPI with gpio CS control */
146 writew(0x01f0, MCF_GPIO_PAR_QSPI);
148 #endif /* defined(CONFIG_SPI_COLDFIRE_QSPI) || defined(CONFIG_SPI_COLDFIRE_QSPI_MODULE) */
151 static struct platform_device *m532x_devices[] __initdata = {
152 #if defined(CONFIG_SPI_COLDFIRE_QSPI) || defined(CONFIG_SPI_COLDFIRE_QSPI_MODULE)
157 /***************************************************************************/
159 static void __init m532x_uarts_init(void)
161 /* UART GPIO initialization */
162 MCF_GPIO_PAR_UART |= 0x0FFF;
165 /***************************************************************************/
167 static void __init m532x_fec_init(void)
169 /* Set multi-function pins to ethernet mode for fec0 */
170 MCF_GPIO_PAR_FECI2C |= (MCF_GPIO_PAR_FECI2C_PAR_MDC_EMDC |
171 MCF_GPIO_PAR_FECI2C_PAR_MDIO_EMDIO);
172 MCF_GPIO_PAR_FEC = (MCF_GPIO_PAR_FEC_PAR_FEC_7W_FEC |
173 MCF_GPIO_PAR_FEC_PAR_FEC_MII_FEC);
176 /***************************************************************************/
178 static void m532x_cpu_reset(void)
181 __raw_writeb(MCF_RCR_SWRESET, MCF_RCR);
184 /***************************************************************************/
186 void __init config_BSP(char *commandp, int size)
188 #if !defined(CONFIG_BOOTPARAM)
189 /* Copy command line from FLASH to local buffer... */
190 memcpy(commandp, (char *) 0x4000, 4);
191 if(strncmp(commandp, "kcl ", 4) == 0){
192 memcpy(commandp, (char *) 0x4004, size);
193 commandp[size-1] = 0;
195 memset(commandp, 0, size);
199 mach_sched_init = hw_timer_init;
201 #ifdef CONFIG_BDM_DISABLE
203 * Disable the BDM clocking. This also turns off most of the rest of
204 * the BDM device. This is good for EMC reasons. This option is not
205 * incompatible with the memory protection option.
207 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
211 /***************************************************************************/
213 static int __init init_BSP(void)
217 #if defined(CONFIG_SPI_COLDFIRE_QSPI) || defined(CONFIG_SPI_COLDFIRE_QSPI_MODULE)
220 platform_add_devices(m532x_devices, ARRAY_SIZE(m532x_devices));
224 arch_initcall(init_BSP);
226 /***************************************************************************/
227 /* Board initialization */
228 /***************************************************************************/
230 * PLL min/max specifications
232 #define MAX_FVCO 500000 /* KHz */
233 #define MAX_FSYS 80000 /* KHz */
234 #define MIN_FSYS 58333 /* KHz */
235 #define FREF 16000 /* KHz */
238 #define MAX_MFD 135 /* Multiplier */
239 #define MIN_MFD 88 /* Multiplier */
240 #define BUSDIV 6 /* Divider */
243 * Low Power Divider specifications
245 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
246 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
247 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
249 #define SYS_CLK_KHZ 80000
250 #define SYSTEM_PERIOD 12.5
252 * SDRAM Timing Parameters
254 #define SDRAM_BL 8 /* # of beats in a burst */
255 #define SDRAM_TWR 2 /* in clocks */
256 #define SDRAM_CASL 2.5 /* CASL in clocks */
257 #define SDRAM_TRCD 2 /* in clocks */
258 #define SDRAM_TRP 2 /* in clocks */
259 #define SDRAM_TRFC 7 /* in clocks */
260 #define SDRAM_TREFI 7800 /* in ns */
262 #define EXT_SRAM_ADDRESS (0xC0000000)
263 #define FLASH_ADDRESS (0x00000000)
264 #define SDRAM_ADDRESS (0x40000000)
266 #define NAND_FLASH_ADDRESS (0xD0000000)
273 void gpio_init(void);
274 void fbcs_init(void);
275 void sdramc_init(void);
276 int clock_pll (int fsys, int flags);
277 int clock_limp (int);
278 int clock_exit_limp (void);
279 int get_sys_clock (void);
281 asmlinkage void __init sysinit(void)
283 sys_clk_khz = clock_pll(0, 0);
284 sys_clk_mhz = sys_clk_khz/1000;
295 /* Disable watchdog timer */
299 #define MCF_SCM_BCR_GBW (0x00000100)
300 #define MCF_SCM_BCR_GBR (0x00000200)
304 /* All masters are trusted */
305 MCF_SCM_MPR = 0x77777777;
307 /* Allow supervisor/user, read/write, and trusted/untrusted
308 access to all slaves */
317 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
323 MCF_GPIO_PAR_CS = 0x0000003E;
325 /* Latch chip select */
326 MCF_FBCS1_CSAR = 0x10080000;
328 MCF_FBCS1_CSCR = 0x002A3780;
329 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
331 /* Initialize latch to drive signals to inactive states */
332 *((u16 *)(0x10080000)) = 0xFFFF;
335 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
336 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
339 | MCF_FBCS_CSCR_WS(1));
340 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
343 /* Boot Flash connected to FBCS0 */
344 MCF_FBCS0_CSAR = FLASH_ADDRESS;
345 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
349 | MCF_FBCS_CSCR_WS(7));
350 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
354 void sdramc_init(void)
357 * Check to see if the SDRAM has already been initialized
358 * by a run control tool
360 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
361 /* SDRAM chip select initialization */
363 /* Initialize SDRAM chip select */
364 MCF_SDRAMC_SDCS0 = (0
365 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
366 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
369 * Basic configuration and initialization
371 MCF_SDRAMC_SDCFG1 = (0
372 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
373 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
374 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
375 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
376 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
377 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
378 | MCF_SDRAMC_SDCFG1_WTLAT(3));
379 MCF_SDRAMC_SDCFG2 = (0
380 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
381 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
382 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
383 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
387 * Precharge and enable write to SDMR
390 | MCF_SDRAMC_SDCR_MODE_EN
391 | MCF_SDRAMC_SDCR_CKE
392 | MCF_SDRAMC_SDCR_DDR
393 | MCF_SDRAMC_SDCR_MUX(1)
394 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
395 | MCF_SDRAMC_SDCR_PS_16
396 | MCF_SDRAMC_SDCR_IPALL);
399 * Write extended mode register
402 | MCF_SDRAMC_SDMR_BNKAD_LEMR
403 | MCF_SDRAMC_SDMR_AD(0x0)
404 | MCF_SDRAMC_SDMR_CMD);
407 * Write mode register and reset DLL
410 | MCF_SDRAMC_SDMR_BNKAD_LMR
411 | MCF_SDRAMC_SDMR_AD(0x163)
412 | MCF_SDRAMC_SDMR_CMD);
415 * Execute a PALL command
417 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
420 * Perform two REF cycles
422 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
423 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
426 * Write mode register and clear reset DLL
429 | MCF_SDRAMC_SDMR_BNKAD_LMR
430 | MCF_SDRAMC_SDMR_AD(0x063)
431 | MCF_SDRAMC_SDMR_CMD);
434 * Enable auto refresh and lock SDMR
436 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
437 MCF_SDRAMC_SDCR |= (0
438 | MCF_SDRAMC_SDCR_REF
439 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
445 /* Enable UART0 pins */
446 MCF_GPIO_PAR_UART = ( 0
447 | MCF_GPIO_PAR_UART_PAR_URXD0
448 | MCF_GPIO_PAR_UART_PAR_UTXD0);
450 /* Initialize TIN3 as a GPIO output to enable the write
452 MCF_GPIO_PAR_TIMER = 0x00;
453 __raw_writeb(0x08, MCFGPIO_PDDR_TIMER);
454 __raw_writeb(0x00, MCFGPIO_PCLRR_TIMER);
458 int clock_pll(int fsys, int flags)
460 int fref, temp, fout, mfd;
466 /* Return current PLL output */
469 return (fref * mfd / (BUSDIV * 4));
472 /* Check bounds of requested system clock */
478 /* Multiplying by 100 when calculating the temp value,
479 and then dividing by 100 to calculate the mfd allows
480 for exact values without needing to include floating
482 temp = 100 * fsys / fref;
483 mfd = 4 * BUSDIV * temp / 100;
485 /* Determine the output frequency for selected values */
486 fout = (fref * mfd / (BUSDIV * 4));
489 * Check to see if the SDRAM has already been initialized.
490 * If it has then the SDRAM needs to be put into self refresh
491 * mode before reprogramming the PLL.
493 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
494 /* Put SDRAM into self refresh mode */
495 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
498 * Initialize the PLL to generate the new system clock frequency.
499 * The device must be put into LIMP mode to reprogram the PLL.
502 /* Enter LIMP mode */
503 clock_limp(DEFAULT_LPD);
505 /* Reprogram PLL for desired fsys */
507 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
508 | MCF_PLL_PODR_BUSDIV(BUSDIV));
516 * Return the SDRAM to normal operation if it is in use.
518 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
519 /* Exit self refresh mode */
520 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
522 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
523 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
525 /* wait for DQS logic to relock */
526 for (i = 0; i < 0x200; i++)
532 int clock_limp(int div)
536 /* Check bounds of divider */
542 /* Save of the current value of the SSIDIV so we don't
543 overwrite the value*/
544 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
546 /* Apply the divider to the system clock */
548 | MCF_CCM_CDR_LPDIV(div)
549 | MCF_CCM_CDR_SSIDIV(temp));
551 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
553 return (FREF/(3*(1 << div)));
556 int clock_exit_limp(void)
561 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
563 /* Wait for PLL to lock */
564 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
567 fout = get_sys_clock();
572 int get_sys_clock(void)
576 /* Test to see if device is in LIMP mode */
577 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
578 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
579 return (FREF/(2 << divider));
582 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));