--- /dev/null
+/**
+ * Copyright 2010-2011 Freescale Semiconductor
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * This file provides support for the ngPIXIS, a board-specific FPGA used on
+ * some Freescale reference boards.
+ *
+ * A "switch" is black rectangular block on the motherboard. It contains
+ * eight "bits". The ngPIXIS has a set of memory-mapped registers (SWx) that
+ * shadow the actual physical switches. There is also another set of
+ * registers (ENx) that tell the ngPIXIS which bits of SWx should actually be
+ * used to override the values of the bits in the physical switches.
+ *
+ * The following macros need to be defined:
+ *
+ * PIXIS_BASE - The virtual address of the base of the PIXIS register map
+ *
+ * PIXIS_LBMAP_SWITCH - The switch number (i.e. the "x" in "SWx"). This value
+ * is used in the PIXIS_SW() macro to determine which offset in
+ * the PIXIS register map corresponds to the physical switch that controls
+ * the boot bank.
+ *
+ * PIXIS_LBMAP_MASK - A bit mask the defines which bits in SWx to use.
+ *
+ * PIXIS_LBMAP_SHIFT - The shift value that corresponds to PIXIS_LBMAP_MASK.
+ *
+ * PIXIS_LBMAP_ALTBANK - The value to program into SWx to tell the ngPIXIS to
+ * boot from the alternate bank.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+
+#include "ngpixis.h"
+
+static u8 __pixis_read(unsigned int reg)
+{
+ void *p = (void *)PIXIS_BASE;
+
+ return in_8(p + reg);
+}
+u8 pixis_read(unsigned int reg) __attribute__((weak, alias("__pixis_read")));
+
+static void __pixis_write(unsigned int reg, u8 value)
+{
+ void *p = (void *)PIXIS_BASE;
+
+ out_8(p + reg, value);
+}
+void pixis_write(unsigned int reg, u8 value)
+ __attribute__((weak, alias("__pixis_write")));
+
+/*
+ * Reset the board. This ignores the ENx registers.
+ */
+void __pixis_reset(void)
+{
+ PIXIS_WRITE(rst, 0);
+
+ while (1);
+}
+void pixis_reset(void) __attribute__((weak, alias("__pixis_reset")));
+
+/*
+ * Reset the board. Like pixis_reset(), but it honors the ENx registers.
+ */
+void __pixis_bank_reset(void)
+{
+ PIXIS_WRITE(vctl, 0);
+ PIXIS_WRITE(vctl, 1);
+
+ while (1);
+}
+void pixis_bank_reset(void) __attribute__((weak, alias("__pixis_bank_reset")));
+
+/**
+ * Set the boot bank to the power-on default bank
+ */
+void __clear_altbank(void)
+{
+ u8 reg;
+
+ /* Tell the ngPIXIS to use this the bits in the physical switch for the
+ * boot bank value, instead of the SWx register. We need to be careful
+ * only to set the bits in SWx that correspond to the boot bank.
+ */
+ reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
+ reg &= ~PIXIS_LBMAP_MASK;
+ PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
+}
+void clear_altbank(void) __attribute__((weak, alias("__clear_altbank")));
+
+/**
+ * Set the boot bank to the alternate bank
+ */
+void __set_altbank(void)
+{
+ u8 reg;
+
+ /* Program the alternate bank number into the SWx register.
+ */
+ reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].sw);
+ reg = (reg & ~PIXIS_LBMAP_MASK) | PIXIS_LBMAP_ALTBANK;
+ PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].sw, reg);
+
+ /* Tell the ngPIXIS to use this the bits in the SWx register for the
+ * boot bank value, instead of the physical switch. We need to be
+ * careful only to set the bits in SWx that correspond to the boot bank.
+ */
+ reg = PIXIS_READ(s[PIXIS_LBMAP_SWITCH - 1].en);
+ reg |= PIXIS_LBMAP_MASK;
+ PIXIS_WRITE(s[PIXIS_LBMAP_SWITCH - 1].en, reg);
+}
+void set_altbank(void) __attribute__((weak, alias("__set_altbank")));
+
+#ifdef DEBUG
+static void pixis_dump_regs(void)
+{
+ unsigned int i;
+
+ printf("id=%02x\n", PIXIS_READ(id));
+ printf("arch=%02x\n", PIXIS_READ(arch));
+ printf("scver=%02x\n", PIXIS_READ(scver));
+ printf("csr=%02x\n", PIXIS_READ(csr));
+ printf("rst=%02x\n", PIXIS_READ(rst));
+ printf("aux=%02x\n", PIXIS_READ(aux));
+ printf("spd=%02x\n", PIXIS_READ(spd));
+ printf("brdcfg0=%02x\n", PIXIS_READ(brdcfg0));
+ printf("brdcfg1=%02x\n", PIXIS_READ(brdcfg1));
+ printf("addr=%02x\n", PIXIS_READ(addr));
+ printf("data=%02x\n", PIXIS_READ(data));
+ printf("led=%02x\n", PIXIS_READ(led));
+ printf("vctl=%02x\n", PIXIS_READ(vctl));
+ printf("vstat=%02x\n", PIXIS_READ(vstat));
+ printf("vcfgen0=%02x\n", PIXIS_READ(vcfgen0));
+ printf("ocmcsr=%02x\n", PIXIS_READ(ocmcsr));
+ printf("ocmmsg=%02x\n", PIXIS_READ(ocmmsg));
+ printf("gmdbg=%02x\n", PIXIS_READ(gmdbg));
+ printf("sclk=%02x%02x%02x\n",
+ PIXIS_READ(sclk[0]), PIXIS_READ(sclk[1]), PIXIS_READ(sclk[2]));
+ printf("dclk=%02x%02x%02x\n",
+ PIXIS_READ(dclk[0]), PIXIS_READ(dclk[1]), PIXIS_READ(dclk[2]));
+ printf("watch=%02x\n", PIXIS_READ(watch));
+
+ for (i = 0; i < 8; i++) {
+ printf("SW%u=%02x/%02x ", i + 1,
+ PIXIS_READ(s[i].sw), PIXIS_READ(s[i].en));
+ }
+ putc('\n');
+}
+#endif
+
+void pixis_sysclk_set(unsigned long sysclk)
+{
+ unsigned long freq_word;
+ u8 sclk0, sclk1, sclk2;
+
+ freq_word = ics307_sysclk_calculator(sysclk);
+ sclk2 = freq_word & 0xff;
+ sclk1 = (freq_word >> 8) & 0xff;
+ sclk0 = (freq_word >> 16) & 0xff;
+
+ /* set SYSCLK enable bit */
+ PIXIS_WRITE(vcfgen0, 0x01);
+
+ /* SYSCLK to required frequency */
+ PIXIS_WRITE(sclk[0], sclk0);
+ PIXIS_WRITE(sclk[1], sclk1);
+ PIXIS_WRITE(sclk[2], sclk2);
+}
+
+int pixis_reset_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ unsigned int i;
+ unsigned long sysclk;
+ char *p_altbank = NULL;
+#ifdef DEBUG
+ char *p_dump = NULL;
+#endif
+ char *unknown_param = NULL;
+
+ /* No args is a simple reset request.
+ */
+ if (argc <= 1)
+ pixis_reset();
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "altbank") == 0) {
+ p_altbank = argv[i];
+ continue;
+ }
+
+#ifdef DEBUG
+ if (strcmp(argv[i], "dump") == 0) {
+ p_dump = argv[i];
+ continue;
+ }
+#endif
+ if (strcmp(argv[i], "sysclk") == 0) {
+ sysclk = simple_strtoul(argv[i + 1], NULL, 0);
+ i += 1;
+ pixis_sysclk_set(sysclk);
+ continue;
+ }
+
+ unknown_param = argv[i];
+ }
+
+ if (unknown_param) {
+ printf("Invalid option: %s\n", unknown_param);
+ return 1;
+ }
+
+#ifdef DEBUG
+ if (p_dump) {
+ pixis_dump_regs();
+
+ /* 'dump' ignores other commands */
+ return 0;
+ }
+#endif
+
+ if (p_altbank)
+ set_altbank();
+ else
+ clear_altbank();
+
+ pixis_bank_reset();
+
+ /* Shouldn't be reached. */
+ return 0;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char pixis_help_text[] =
+ "- hard reset to default bank\n"
+ "pixis_reset altbank - reset to alternate bank\n"
+#ifdef DEBUG
+ "pixis_reset dump - display the PIXIS registers\n"
+#endif
+ "pixis_reset sysclk <SYSCLK_freq> - reset with SYSCLK frequency(KHz)\n";
+#endif
+
+U_BOOT_CMD(
+ pixis_reset, CONFIG_SYS_MAXARGS, 1, pixis_reset_cmd,
+ "Reset the board using the FPGA sequencer", pixis_help_text
+ );
Code Review / kvmfornfv.git / blobdiff