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 #ifdef CONFIG_SPI_COLDFIRE_QSPI
35 static void __init m532x_qspi_init(void)
37 /* setup QSPS pins for QSPI with gpio CS control */
38 writew(0x01f0, MCF_GPIO_PAR_QSPI);
41 #endif /* CONFIG_SPI_COLDFIRE_QSPI */
43 /***************************************************************************/
45 static void __init m532x_uarts_init(void)
47 /* UART GPIO initialization */
48 MCF_GPIO_PAR_UART |= 0x0FFF;
51 /***************************************************************************/
53 static void __init m532x_fec_init(void)
55 /* Set multi-function pins to ethernet mode for fec0 */
56 MCF_GPIO_PAR_FECI2C |= (MCF_GPIO_PAR_FECI2C_PAR_MDC_EMDC |
57 MCF_GPIO_PAR_FECI2C_PAR_MDIO_EMDIO);
58 MCF_GPIO_PAR_FEC = (MCF_GPIO_PAR_FEC_PAR_FEC_7W_FEC |
59 MCF_GPIO_PAR_FEC_PAR_FEC_MII_FEC);
62 /***************************************************************************/
64 void __init config_BSP(char *commandp, int size)
66 #if !defined(CONFIG_BOOTPARAM)
67 /* Copy command line from FLASH to local buffer... */
68 memcpy(commandp, (char *) 0x4000, 4);
69 if(strncmp(commandp, "kcl ", 4) == 0){
70 memcpy(commandp, (char *) 0x4004, size);
73 memset(commandp, 0, size);
77 mach_sched_init = hw_timer_init;
80 #ifdef CONFIG_SPI_COLDFIRE_QSPI
84 #ifdef CONFIG_BDM_DISABLE
86 * Disable the BDM clocking. This also turns off most of the rest of
87 * the BDM device. This is good for EMC reasons. This option is not
88 * incompatible with the memory protection option.
90 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
94 /***************************************************************************/
95 /* Board initialization */
96 /***************************************************************************/
98 * PLL min/max specifications
100 #define MAX_FVCO 500000 /* KHz */
101 #define MAX_FSYS 80000 /* KHz */
102 #define MIN_FSYS 58333 /* KHz */
103 #define FREF 16000 /* KHz */
106 #define MAX_MFD 135 /* Multiplier */
107 #define MIN_MFD 88 /* Multiplier */
108 #define BUSDIV 6 /* Divider */
111 * Low Power Divider specifications
113 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
114 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
115 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
117 #define SYS_CLK_KHZ 80000
118 #define SYSTEM_PERIOD 12.5
120 * SDRAM Timing Parameters
122 #define SDRAM_BL 8 /* # of beats in a burst */
123 #define SDRAM_TWR 2 /* in clocks */
124 #define SDRAM_CASL 2.5 /* CASL in clocks */
125 #define SDRAM_TRCD 2 /* in clocks */
126 #define SDRAM_TRP 2 /* in clocks */
127 #define SDRAM_TRFC 7 /* in clocks */
128 #define SDRAM_TREFI 7800 /* in ns */
130 #define EXT_SRAM_ADDRESS (0xC0000000)
131 #define FLASH_ADDRESS (0x00000000)
132 #define SDRAM_ADDRESS (0x40000000)
134 #define NAND_FLASH_ADDRESS (0xD0000000)
141 void gpio_init(void);
142 void fbcs_init(void);
143 void sdramc_init(void);
144 int clock_pll (int fsys, int flags);
145 int clock_limp (int);
146 int clock_exit_limp (void);
147 int get_sys_clock (void);
149 asmlinkage void __init sysinit(void)
151 sys_clk_khz = clock_pll(0, 0);
152 sys_clk_mhz = sys_clk_khz/1000;
163 /* Disable watchdog timer */
167 #define MCF_SCM_BCR_GBW (0x00000100)
168 #define MCF_SCM_BCR_GBR (0x00000200)
172 /* All masters are trusted */
173 MCF_SCM_MPR = 0x77777777;
175 /* Allow supervisor/user, read/write, and trusted/untrusted
176 access to all slaves */
185 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
191 MCF_GPIO_PAR_CS = 0x0000003E;
193 /* Latch chip select */
194 MCF_FBCS1_CSAR = 0x10080000;
196 MCF_FBCS1_CSCR = 0x002A3780;
197 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
199 /* Initialize latch to drive signals to inactive states */
200 *((u16 *)(0x10080000)) = 0xFFFF;
203 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
204 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
207 | MCF_FBCS_CSCR_WS(1));
208 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
211 /* Boot Flash connected to FBCS0 */
212 MCF_FBCS0_CSAR = FLASH_ADDRESS;
213 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
217 | MCF_FBCS_CSCR_WS(7));
218 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
222 void sdramc_init(void)
225 * Check to see if the SDRAM has already been initialized
226 * by a run control tool
228 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
229 /* SDRAM chip select initialization */
231 /* Initialize SDRAM chip select */
232 MCF_SDRAMC_SDCS0 = (0
233 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
234 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
237 * Basic configuration and initialization
239 MCF_SDRAMC_SDCFG1 = (0
240 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
241 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
242 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
243 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
244 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
245 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
246 | MCF_SDRAMC_SDCFG1_WTLAT(3));
247 MCF_SDRAMC_SDCFG2 = (0
248 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
249 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
250 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
251 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
255 * Precharge and enable write to SDMR
258 | MCF_SDRAMC_SDCR_MODE_EN
259 | MCF_SDRAMC_SDCR_CKE
260 | MCF_SDRAMC_SDCR_DDR
261 | MCF_SDRAMC_SDCR_MUX(1)
262 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
263 | MCF_SDRAMC_SDCR_PS_16
264 | MCF_SDRAMC_SDCR_IPALL);
267 * Write extended mode register
270 | MCF_SDRAMC_SDMR_BNKAD_LEMR
271 | MCF_SDRAMC_SDMR_AD(0x0)
272 | MCF_SDRAMC_SDMR_CMD);
275 * Write mode register and reset DLL
278 | MCF_SDRAMC_SDMR_BNKAD_LMR
279 | MCF_SDRAMC_SDMR_AD(0x163)
280 | MCF_SDRAMC_SDMR_CMD);
283 * Execute a PALL command
285 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
288 * Perform two REF cycles
290 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
291 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
294 * Write mode register and clear reset DLL
297 | MCF_SDRAMC_SDMR_BNKAD_LMR
298 | MCF_SDRAMC_SDMR_AD(0x063)
299 | MCF_SDRAMC_SDMR_CMD);
302 * Enable auto refresh and lock SDMR
304 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
305 MCF_SDRAMC_SDCR |= (0
306 | MCF_SDRAMC_SDCR_REF
307 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
313 /* Enable UART0 pins */
314 MCF_GPIO_PAR_UART = ( 0
315 | MCF_GPIO_PAR_UART_PAR_URXD0
316 | MCF_GPIO_PAR_UART_PAR_UTXD0);
318 /* Initialize TIN3 as a GPIO output to enable the write
320 MCF_GPIO_PAR_TIMER = 0x00;
321 __raw_writeb(0x08, MCFGPIO_PDDR_TIMER);
322 __raw_writeb(0x00, MCFGPIO_PCLRR_TIMER);
326 int clock_pll(int fsys, int flags)
328 int fref, temp, fout, mfd;
334 /* Return current PLL output */
337 return (fref * mfd / (BUSDIV * 4));
340 /* Check bounds of requested system clock */
346 /* Multiplying by 100 when calculating the temp value,
347 and then dividing by 100 to calculate the mfd allows
348 for exact values without needing to include floating
350 temp = 100 * fsys / fref;
351 mfd = 4 * BUSDIV * temp / 100;
353 /* Determine the output frequency for selected values */
354 fout = (fref * mfd / (BUSDIV * 4));
357 * Check to see if the SDRAM has already been initialized.
358 * If it has then the SDRAM needs to be put into self refresh
359 * mode before reprogramming the PLL.
361 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
362 /* Put SDRAM into self refresh mode */
363 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
366 * Initialize the PLL to generate the new system clock frequency.
367 * The device must be put into LIMP mode to reprogram the PLL.
370 /* Enter LIMP mode */
371 clock_limp(DEFAULT_LPD);
373 /* Reprogram PLL for desired fsys */
375 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
376 | MCF_PLL_PODR_BUSDIV(BUSDIV));
384 * Return the SDRAM to normal operation if it is in use.
386 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
387 /* Exit self refresh mode */
388 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
390 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
391 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
393 /* wait for DQS logic to relock */
394 for (i = 0; i < 0x200; i++)
400 int clock_limp(int div)
404 /* Check bounds of divider */
410 /* Save of the current value of the SSIDIV so we don't
411 overwrite the value*/
412 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
414 /* Apply the divider to the system clock */
416 | MCF_CCM_CDR_LPDIV(div)
417 | MCF_CCM_CDR_SSIDIV(temp));
419 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
421 return (FREF/(3*(1 << div)));
424 int clock_exit_limp(void)
429 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
431 /* Wait for PLL to lock */
432 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
435 fout = get_sys_clock();
440 int get_sys_clock(void)
444 /* Test to see if device is in LIMP mode */
445 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
446 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
447 return (FREF/(2 << divider));
450 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));