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      1 /* $Id: bootimx23.c,v 1.1 2013/10/07 17:36:40 matt Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Petri Laakso.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/param.h>
     33 #include <sys/cdefs.h>
     34 
     35 #include <arm/imx/imx23_digctlreg.h>
     36 #include <arm/imx/imx23_powerreg.h>
     37 #include <arm/imx/imx23_clkctrlreg.h>
     38 
     39 #include <lib/libsa/stand.h>
     40 
     41 #include "common.h"
     42 
     43 #define DRAM_REGS 41
     44 #define HBUS_DIV 2
     45 #define CPU_FRAC 22
     46 #define EMI_DIV 2
     47 #define EMI_FRAC 33
     48 #define SSP_DIV 2
     49 #define IO_FRAC 27
     50 
     51 /*
     52  * Initialize i.MX233
     53  */
     54 int
     55 _start(void)
     56 {
     57 
     58 	volatile uint32_t *digctl_ctrl_rs;
     59 	volatile uint32_t *digctl_ctrl_rc;
     60 	volatile uint32_t *digctl_id_r;
     61 	volatile uint32_t *pwr_status_r;
     62 	uint8_t boot_reason;
     63 	int on_batt;
     64 
     65 	digctl_ctrl_rs = (uint32_t *)(HW_DIGCTL_BASE + HW_DIGCTL_CTRL_SET);
     66 	digctl_ctrl_rc = (uint32_t *)(HW_DIGCTL_BASE + HW_DIGCTL_CTRL_CLR);
     67 	pwr_status_r = (uint32_t *)(HW_POWER_BASE + HW_POWER_STS);
     68 	digctl_id_r = (uint32_t *)(HW_DIGCTL_BASE + HW_DIGCTL_CHIPID);
     69 
     70 	/* Enable SJTAG. */
     71 	*digctl_ctrl_rs = HW_DIGCTL_CTRL_USE_SERIAL_JTAG;
     72 
     73 	/* Enable microseconds timer. */
     74 	*digctl_ctrl_rc = HW_DIGCTL_CTRL_XTAL24M_GATE;
     75 
     76 	if (*pwr_status_r & HW_POWER_STS_VDD5V_GT_VDDIO)
     77 		on_batt = 0;
     78 	else
     79 		on_batt = 1;
     80 
     81 	printf("\r\nbootimx23: ");
     82 	printf("HW revision TA%d, ",
     83 	   (uint8_t)__SHIFTOUT(*digctl_id_r, HW_DIGCTL_CHIPID_REVISION) + 1);
     84 	printf("boot reason ");
     85 	boot_reason =
     86 		(uint8_t) __SHIFTOUT(*pwr_status_r, HW_POWER_STS_PWRUP_SOURCE);
     87 
     88 	switch (boot_reason)
     89 	{
     90 		case 0x20:
     91 			printf("5V, ");
     92 			break;
     93 		case 0x10:
     94 			printf("RTC, ");
     95 			break;
     96 		case 0x02:
     97 			printf("high pswitch, ");
     98 			break;
     99 		case 0x01:
    100 			printf("mid pswitch, ");
    101 			break;
    102 		default:
    103 			printf("UNKNOWN, ");
    104 	}
    105 
    106 	printf("power source ");
    107 	if (on_batt)
    108 		printf("battery");
    109 	else
    110 		printf("5V");
    111 	printf("\r\n");
    112 
    113 	/* Power. */
    114 	en_vbusvalid();
    115 	if (!vbusvalid())
    116 		printf("WARNING: !VBUSVALID\r\n");
    117 
    118 	printf("Enabling 4P2 regulator...");
    119 	en_4p2_reg();
    120 	printf("done\r\n");
    121 
    122 	power_tune();
    123 
    124 	printf("Enabling 4P2 regulator output to DCDC...");
    125 	en_4p2_to_dcdc();
    126 	printf("done\r\n");
    127 
    128 	printf("Enabling VDDMEM...");
    129 	power_vddmem(2500);
    130 	printf("done\r\n");
    131 
    132 	printf("Powering VDDD from DCDC...");
    133 	/* Boot fails if I set here TRG to +1500mV, do it later. */
    134 	power_vddd_from_dcdc(1400, 1075);
    135 	printf("done\r\n");
    136 
    137 	printf("Powering VDDA from DCDC...");
    138 	power_vdda_from_dcdc(1800, 1625);
    139 	printf("done\r\n");
    140 
    141 	/*
    142 	 * VDDIO and thus SSP_CLK setup is postponed to
    143 	 * imx23_olinuxino_machdep.c because SB is not able to load kernel if
    144 	 * clocks are changed now.
    145 	 */
    146 	printf("Powering VDDIO from DCDC...");
    147 	power_vddio_from_dcdc(3100, 2925);
    148 	printf("done\r\n");
    149 
    150 	/* Clocks */
    151 	printf("Enabling clocks...");
    152 	en_pll();
    153 	bypass_saif(); /* Always set to zero bit. */
    154 	set_cpu_frac(CPU_FRAC);
    155 	set_hbus_div(HBUS_DIV);
    156 	bypass_cpu();
    157 	power_vddd_from_dcdc(1475, 1375);
    158 	set_emi_div(EMI_DIV);
    159 	set_emi_frac(EMI_FRAC);
    160 	bypass_emi();
    161 	printf("done\r\n");
    162 
    163 	printf("Configuring pins...");
    164 	pinctrl_prep();
    165 	printf("done\r\n");
    166 	printf("Configuring EMI...");
    167 	emi_prep();
    168 	printf("done\r\n");
    169 	args_prep();
    170 
    171 	return 0;
    172 }
    173