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 <shess@hessware.de>
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/mcfgpio.h>
30 #include <asm/mcfwdebug.h>
32 /***************************************************************************/
34 struct mcf_gpio_chip mcf_gpio_chips[] = {
35 MCFGPS(PIRQ, 0, 8, MCFEPORT_EPDDR, MCFEPORT_EPDR, MCFEPORT_EPPDR),
39 MCFGPF(BUSCTL, 32, 4),
43 MCFGPF(FECI2C, 64, 4),
47 MCFGPF(LCDDATAH, 96, 2),
48 MCFGPF(LCDDATAM, 104, 8),
49 MCFGPF(LCDDATAL, 112, 8),
50 MCFGPF(LCDCTLH, 120, 1),
51 MCFGPF(LCDCTLL, 128, 8),
54 unsigned int mcf_gpio_chips_size = ARRAY_SIZE(mcf_gpio_chips);
56 /***************************************************************************/
58 #if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI)
60 static void __init m532x_qspi_init(void)
62 /* setup QSPS pins for QSPI with gpio CS control */
63 writew(0x01f0, MCF_GPIO_PAR_QSPI);
66 #endif /* IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) */
68 /***************************************************************************/
70 static void __init m532x_uarts_init(void)
72 /* UART GPIO initialization */
73 MCF_GPIO_PAR_UART |= 0x0FFF;
76 /***************************************************************************/
78 static void __init m532x_fec_init(void)
80 /* Set multi-function pins to ethernet mode for fec0 */
81 MCF_GPIO_PAR_FECI2C |= (MCF_GPIO_PAR_FECI2C_PAR_MDC_EMDC |
82 MCF_GPIO_PAR_FECI2C_PAR_MDIO_EMDIO);
83 MCF_GPIO_PAR_FEC = (MCF_GPIO_PAR_FEC_PAR_FEC_7W_FEC |
84 MCF_GPIO_PAR_FEC_PAR_FEC_MII_FEC);
87 /***************************************************************************/
89 void __init config_BSP(char *commandp, int size)
91 #if !defined(CONFIG_BOOTPARAM)
92 /* Copy command line from FLASH to local buffer... */
93 memcpy(commandp, (char *) 0x4000, 4);
94 if(strncmp(commandp, "kcl ", 4) == 0){
95 memcpy(commandp, (char *) 0x4004, size);
98 memset(commandp, 0, size);
102 mach_sched_init = hw_timer_init;
105 #if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI)
109 #ifdef CONFIG_BDM_DISABLE
111 * Disable the BDM clocking. This also turns off most of the rest of
112 * the BDM device. This is good for EMC reasons. This option is not
113 * incompatible with the memory protection option.
115 wdebug(MCFDEBUG_CSR, MCFDEBUG_CSR_PSTCLK);
119 /***************************************************************************/
120 /* Board initialization */
121 /***************************************************************************/
123 * PLL min/max specifications
125 #define MAX_FVCO 500000 /* KHz */
126 #define MAX_FSYS 80000 /* KHz */
127 #define MIN_FSYS 58333 /* KHz */
128 #define FREF 16000 /* KHz */
131 #define MAX_MFD 135 /* Multiplier */
132 #define MIN_MFD 88 /* Multiplier */
133 #define BUSDIV 6 /* Divider */
136 * Low Power Divider specifications
138 #define MIN_LPD (1 << 0) /* Divider (not encoded) */
139 #define MAX_LPD (1 << 15) /* Divider (not encoded) */
140 #define DEFAULT_LPD (1 << 1) /* Divider (not encoded) */
142 #define SYS_CLK_KHZ 80000
143 #define SYSTEM_PERIOD 12.5
145 * SDRAM Timing Parameters
147 #define SDRAM_BL 8 /* # of beats in a burst */
148 #define SDRAM_TWR 2 /* in clocks */
149 #define SDRAM_CASL 2.5 /* CASL in clocks */
150 #define SDRAM_TRCD 2 /* in clocks */
151 #define SDRAM_TRP 2 /* in clocks */
152 #define SDRAM_TRFC 7 /* in clocks */
153 #define SDRAM_TREFI 7800 /* in ns */
155 #define EXT_SRAM_ADDRESS (0xC0000000)
156 #define FLASH_ADDRESS (0x00000000)
157 #define SDRAM_ADDRESS (0x40000000)
159 #define NAND_FLASH_ADDRESS (0xD0000000)
166 void gpio_init(void);
167 void fbcs_init(void);
168 void sdramc_init(void);
169 int clock_pll (int fsys, int flags);
170 int clock_limp (int);
171 int clock_exit_limp (void);
172 int get_sys_clock (void);
174 asmlinkage void __init sysinit(void)
176 sys_clk_khz = clock_pll(0, 0);
177 sys_clk_mhz = sys_clk_khz/1000;
188 /* Disable watchdog timer */
192 #define MCF_SCM_BCR_GBW (0x00000100)
193 #define MCF_SCM_BCR_GBR (0x00000200)
197 /* All masters are trusted */
198 MCF_SCM_MPR = 0x77777777;
200 /* Allow supervisor/user, read/write, and trusted/untrusted
201 access to all slaves */
210 MCF_SCM_BCR = (MCF_SCM_BCR_GBR | MCF_SCM_BCR_GBW);
216 MCF_GPIO_PAR_CS = 0x0000003E;
218 /* Latch chip select */
219 MCF_FBCS1_CSAR = 0x10080000;
221 MCF_FBCS1_CSCR = 0x002A3780;
222 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_2M | MCF_FBCS_CSMR_V);
224 /* Initialize latch to drive signals to inactive states */
225 *((u16 *)(0x10080000)) = 0xFFFF;
228 MCF_FBCS1_CSAR = EXT_SRAM_ADDRESS;
229 MCF_FBCS1_CSCR = (MCF_FBCS_CSCR_PS_16
232 | MCF_FBCS_CSCR_WS(1));
233 MCF_FBCS1_CSMR = (MCF_FBCS_CSMR_BAM_512K
236 /* Boot Flash connected to FBCS0 */
237 MCF_FBCS0_CSAR = FLASH_ADDRESS;
238 MCF_FBCS0_CSCR = (MCF_FBCS_CSCR_PS_16
242 | MCF_FBCS_CSCR_WS(7));
243 MCF_FBCS0_CSMR = (MCF_FBCS_CSMR_BAM_32M
247 void sdramc_init(void)
250 * Check to see if the SDRAM has already been initialized
251 * by a run control tool
253 if (!(MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)) {
254 /* SDRAM chip select initialization */
256 /* Initialize SDRAM chip select */
257 MCF_SDRAMC_SDCS0 = (0
258 | MCF_SDRAMC_SDCS_BA(SDRAM_ADDRESS)
259 | MCF_SDRAMC_SDCS_CSSZ(MCF_SDRAMC_SDCS_CSSZ_32MBYTE));
262 * Basic configuration and initialization
264 MCF_SDRAMC_SDCFG1 = (0
265 | MCF_SDRAMC_SDCFG1_SRD2RW((int)((SDRAM_CASL + 2) + 0.5 ))
266 | MCF_SDRAMC_SDCFG1_SWT2RD(SDRAM_TWR + 1)
267 | MCF_SDRAMC_SDCFG1_RDLAT((int)((SDRAM_CASL*2) + 2))
268 | MCF_SDRAMC_SDCFG1_ACT2RW((int)((SDRAM_TRCD ) + 0.5))
269 | MCF_SDRAMC_SDCFG1_PRE2ACT((int)((SDRAM_TRP ) + 0.5))
270 | MCF_SDRAMC_SDCFG1_REF2ACT((int)(((SDRAM_TRFC) ) + 0.5))
271 | MCF_SDRAMC_SDCFG1_WTLAT(3));
272 MCF_SDRAMC_SDCFG2 = (0
273 | MCF_SDRAMC_SDCFG2_BRD2PRE(SDRAM_BL/2 + 1)
274 | MCF_SDRAMC_SDCFG2_BWT2RW(SDRAM_BL/2 + SDRAM_TWR)
275 | MCF_SDRAMC_SDCFG2_BRD2WT((int)((SDRAM_CASL+SDRAM_BL/2-1.0)+0.5))
276 | MCF_SDRAMC_SDCFG2_BL(SDRAM_BL-1));
280 * Precharge and enable write to SDMR
283 | MCF_SDRAMC_SDCR_MODE_EN
284 | MCF_SDRAMC_SDCR_CKE
285 | MCF_SDRAMC_SDCR_DDR
286 | MCF_SDRAMC_SDCR_MUX(1)
287 | MCF_SDRAMC_SDCR_RCNT((int)(((SDRAM_TREFI/(SYSTEM_PERIOD*64)) - 1) + 0.5))
288 | MCF_SDRAMC_SDCR_PS_16
289 | MCF_SDRAMC_SDCR_IPALL);
292 * Write extended mode register
295 | MCF_SDRAMC_SDMR_BNKAD_LEMR
296 | MCF_SDRAMC_SDMR_AD(0x0)
297 | MCF_SDRAMC_SDMR_CMD);
300 * Write mode register and reset DLL
303 | MCF_SDRAMC_SDMR_BNKAD_LMR
304 | MCF_SDRAMC_SDMR_AD(0x163)
305 | MCF_SDRAMC_SDMR_CMD);
308 * Execute a PALL command
310 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IPALL;
313 * Perform two REF cycles
315 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
316 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_IREF;
319 * Write mode register and clear reset DLL
322 | MCF_SDRAMC_SDMR_BNKAD_LMR
323 | MCF_SDRAMC_SDMR_AD(0x063)
324 | MCF_SDRAMC_SDMR_CMD);
327 * Enable auto refresh and lock SDMR
329 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_MODE_EN;
330 MCF_SDRAMC_SDCR |= (0
331 | MCF_SDRAMC_SDCR_REF
332 | MCF_SDRAMC_SDCR_DQS_OE(0xC));
338 /* Enable UART0 pins */
339 MCF_GPIO_PAR_UART = ( 0
340 | MCF_GPIO_PAR_UART_PAR_URXD0
341 | MCF_GPIO_PAR_UART_PAR_UTXD0);
343 /* Initialize TIN3 as a GPIO output to enable the write
345 MCF_GPIO_PAR_TIMER = 0x00;
346 __raw_writeb(0x08, MCFGPIO_PDDR_TIMER);
347 __raw_writeb(0x00, MCFGPIO_PCLRR_TIMER);
351 int clock_pll(int fsys, int flags)
353 int fref, temp, fout, mfd;
359 /* Return current PLL output */
362 return (fref * mfd / (BUSDIV * 4));
365 /* Check bounds of requested system clock */
371 /* Multiplying by 100 when calculating the temp value,
372 and then dividing by 100 to calculate the mfd allows
373 for exact values without needing to include floating
375 temp = 100 * fsys / fref;
376 mfd = 4 * BUSDIV * temp / 100;
378 /* Determine the output frequency for selected values */
379 fout = (fref * mfd / (BUSDIV * 4));
382 * Check to see if the SDRAM has already been initialized.
383 * If it has then the SDRAM needs to be put into self refresh
384 * mode before reprogramming the PLL.
386 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
387 /* Put SDRAM into self refresh mode */
388 MCF_SDRAMC_SDCR &= ~MCF_SDRAMC_SDCR_CKE;
391 * Initialize the PLL to generate the new system clock frequency.
392 * The device must be put into LIMP mode to reprogram the PLL.
395 /* Enter LIMP mode */
396 clock_limp(DEFAULT_LPD);
398 /* Reprogram PLL for desired fsys */
400 | MCF_PLL_PODR_CPUDIV(BUSDIV/3)
401 | MCF_PLL_PODR_BUSDIV(BUSDIV));
409 * Return the SDRAM to normal operation if it is in use.
411 if (MCF_SDRAMC_SDCR & MCF_SDRAMC_SDCR_REF)
412 /* Exit self refresh mode */
413 MCF_SDRAMC_SDCR |= MCF_SDRAMC_SDCR_CKE;
415 /* Errata - workaround for SDRAM opeartion after exiting LIMP mode */
416 MCF_SDRAMC_LIMP_FIX = MCF_SDRAMC_REFRESH;
418 /* wait for DQS logic to relock */
419 for (i = 0; i < 0x200; i++)
425 int clock_limp(int div)
429 /* Check bounds of divider */
435 /* Save of the current value of the SSIDIV so we don't
436 overwrite the value*/
437 temp = (MCF_CCM_CDR & MCF_CCM_CDR_SSIDIV(0xF));
439 /* Apply the divider to the system clock */
441 | MCF_CCM_CDR_LPDIV(div)
442 | MCF_CCM_CDR_SSIDIV(temp));
444 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_LIMP;
446 return (FREF/(3*(1 << div)));
449 int clock_exit_limp(void)
454 MCF_CCM_MISCCR = (MCF_CCM_MISCCR & ~ MCF_CCM_MISCCR_LIMP);
456 /* Wait for PLL to lock */
457 while (!(MCF_CCM_MISCCR & MCF_CCM_MISCCR_PLL_LOCK))
460 fout = get_sys_clock();
465 int get_sys_clock(void)
469 /* Test to see if device is in LIMP mode */
470 if (MCF_CCM_MISCCR & MCF_CCM_MISCCR_LIMP) {
471 divider = MCF_CCM_CDR & MCF_CCM_CDR_LPDIV(0xF);
472 return (FREF/(2 << divider));
475 return ((FREF * MCF_PLL_PFDR) / (BUSDIV * 4));