/* * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB . * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ /* stuff specific for the sc520, * but idependent of implementation */ #include #include #include #include #include #include /* * utility functions for boards based on the AMD sc520 * * void write_mmcr_byte(u16 mmcr, u8 data) * void write_mmcr_word(u16 mmcr, u16 data) * void write_mmcr_long(u16 mmcr, u32 data) * * u8 read_mmcr_byte(u16 mmcr) * u16 read_mmcr_word(u16 mmcr) * u32 read_mmcr_long(u16 mmcr) * * void init_sc520(void) * unsigned long init_sc520_dram(void) * void pci_sc520_init(struct pci_controller *hose) * * void reset_timer(void) * ulong get_timer(ulong base) * void set_timer(ulong t) * void udelay(unsigned long usec) * */ static u32 mmcr_base= 0xfffef000; void write_mmcr_byte(u16 mmcr, u8 data) { writeb(data, mmcr+mmcr_base); } void write_mmcr_word(u16 mmcr, u16 data) { writew(data, mmcr+mmcr_base); } void write_mmcr_long(u16 mmcr, u32 data) { writel(data, mmcr+mmcr_base); } u8 read_mmcr_byte(u16 mmcr) { return readb(mmcr+mmcr_base); } u16 read_mmcr_word(u16 mmcr) { return readw(mmcr+mmcr_base); } u32 read_mmcr_long(u16 mmcr) { return readl(mmcr+mmcr_base); } void init_sc520(void) { DECLARE_GLOBAL_DATA_PTR; /* Set the UARTxCTL register at it's slower, * baud clock giving us a 1.8432 MHz reference */ write_mmcr_byte(SC520_UART1CTL, 7); write_mmcr_byte(SC520_UART2CTL, 7); /* first set the timer pin mapping */ write_mmcr_byte(SC520_CLKSEL, 0x72); /* no clock frequency selected, use 1.1892MHz */ /* enable PCI bus arbitrer */ write_mmcr_byte(SC520_SYSARBCTL,0x02); /* enable concurrent mode */ write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */ write_mmcr_word(SC520_HBCTL,0x04); /* enable posted-writes */ if (CFG_SC520_HIGH_SPEED) { write_mmcr_byte(SC520_CPUCTL, 0x2); /* set it to 133 MHz and write back */ gd->cpu_clk = 133000000; printf("## CPU Speed set to 133MHz\n"); } else { write_mmcr_byte(SC520_CPUCTL, 1); /* set CPU to 100 MHz and write back cache */ printf("## CPU Speed set to 100MHz\n"); gd->cpu_clk = 100000000; } /* wait at least one millisecond */ asm("movl $0x2000,%%ecx\n" "wait_loop: pushl %%ecx\n" "popl %%ecx\n" "loop wait_loop\n": : : "ecx"); /* turn on the SDRAM write buffer */ write_mmcr_byte(SC520_DBCTL, 0x11); /* turn on the cache and disable write through */ asm("movl %%cr0, %%eax\n" "andl $0x9fffffff, %%eax\n" "movl %%eax, %%cr0\n" : : : "eax"); } unsigned long init_sc520_dram(void) { DECLARE_GLOBAL_DATA_PTR; bd_t *bd = gd->bd; u32 dram_present=0; u32 dram_ctrl; int val; int cas_precharge_delay = CFG_SDRAM_PRECHARGE_DELAY; int refresh_rate = CFG_SDRAM_REFRESH_RATE; int ras_cas_delay = CFG_SDRAM_RAS_CAS_DELAY; /* set SDRAM speed here */ refresh_rate/=78; if (refresh_rate<=1) { val = 0; /* 7.8us */ } else if (refresh_rate==2) { val = 1; /* 15.6us */ } else if (refresh_rate==3 || refresh_rate==4) { val = 2; /* 31.2us */ } else { val = 3; /* 62.4us */ } write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4)); val = read_mmcr_byte(SC520_DRCTMCTL); val &= 0xf0; if (cas_precharge_delay==3) { val |= 0x04; /* 3T */ } else if (cas_precharge_delay==4) { val |= 0x08; /* 4T */ } else if (cas_precharge_delay>4) { val |= 0x0c; } if (ras_cas_delay > 3) { val |= 2; } else { val |= 1; } write_mmcr_byte(SC520_DRCTMCTL, val); /* We read-back the configuration of the dram * controller that the assembly code wrote */ dram_ctrl = read_mmcr_long(SC520_DRCBENDADR); bd->bi_dram[0].start = 0; if (dram_ctrl & 0x80) { /* bank 0 enabled */ dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22; bd->bi_dram[0].size = bd->bi_dram[1].start; } else { bd->bi_dram[0].size = 0; bd->bi_dram[1].start = bd->bi_dram[0].start; } if (dram_ctrl & 0x8000) { /* bank 1 enabled */ dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14; bd->bi_dram[1].size = bd->bi_dram[2].start - bd->bi_dram[1].start; } else { bd->bi_dram[1].size = 0; bd->bi_dram[2].start = bd->bi_dram[1].start; } if (dram_ctrl & 0x800000) { /* bank 2 enabled */ dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6; bd->bi_dram[2].size = bd->bi_dram[3].start - bd->bi_dram[2].start; } else { bd->bi_dram[2].size = 0; bd->bi_dram[3].start = bd->bi_dram[2].start; } if (dram_ctrl & 0x80000000) { /* bank 3 enabled */ dram_present = (dram_ctrl & 0x7f000000) >> 2; bd->bi_dram[3].size = dram_present - bd->bi_dram[3].start; } else { bd->bi_dram[3].size = 0; } #if 0 printf("Configured %d bytes of dram\n", dram_present); #endif gd->ram_size = dram_present; return dram_present; } #ifdef CONFIG_PCI void pci_sc520_init(struct pci_controller *hose) { hose->first_busno = 0; hose->last_busno = 0xff; /* System memory space */ pci_set_region(hose->regions + 0, SC520_PCI_MEMORY_BUS, SC520_PCI_MEMORY_PHYS, SC520_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_MEMORY); /* PCI memory space */ pci_set_region(hose->regions + 1, SC520_PCI_MEM_BUS, SC520_PCI_MEM_PHYS, SC520_PCI_MEM_SIZE, PCI_REGION_MEM); /* ISA/PCI memory space */ pci_set_region(hose->regions + 2, SC520_ISA_MEM_BUS, SC520_ISA_MEM_PHYS, SC520_ISA_MEM_SIZE, PCI_REGION_MEM); /* PCI I/O space */ pci_set_region(hose->regions + 3, SC520_PCI_IO_BUS, SC520_PCI_IO_PHYS, SC520_PCI_IO_SIZE, PCI_REGION_IO); /* ISA/PCI I/O space */ pci_set_region(hose->regions + 4, SC520_ISA_IO_BUS, SC520_ISA_IO_PHYS, SC520_ISA_IO_SIZE, PCI_REGION_IO); hose->region_count = 5; pci_setup_type1(hose, SC520_REG_ADDR, SC520_REG_DATA); pci_register_hose(hose); hose->last_busno = pci_hose_scan(hose); /* enable target memory acceses on host brige */ pci_write_config_word(0, PCI_COMMAND, PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); } #endif #ifdef CFG_TIMER_SC520 void reset_timer(void) { write_mmcr_word(SC520_GPTMR0CNT, 0); write_mmcr_word(SC520_GPTMR0CTL, 0x6001); } ulong get_timer(ulong base) { /* fixme: 30 or 33 */ return read_mmcr_word(SC520_GPTMR0CNT) / 33; } void set_timer(ulong t) { /* FixMe: use two cascade coupled timers */ write_mmcr_word(SC520_GPTMR0CTL, 0x4001); write_mmcr_word(SC520_GPTMR0CNT, t*33); write_mmcr_word(SC520_GPTMR0CTL, 0x6001); } void udelay(unsigned long usec) { int m=0; long u; read_mmcr_word(SC520_SWTMRMILLI); read_mmcr_word(SC520_SWTMRMICRO); #if 0 /* do not enable this line, udelay is used in the serial driver -> recursion */ printf("udelay: %ld m.u %d.%d tm.tu %d.%d\n", usec, m, u, tm, tu); #endif while (1) { m += read_mmcr_word(SC520_SWTMRMILLI); u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000); if (usec <= u) { break; } } } #endif