X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=cpu%2Fi386%2Fsc520%2Fsc520.c;fp=cpu%2Fi386%2Fsc520%2Fsc520.c;h=b958f8dc043606b079a9dd3a25a0bed03f38b1bd;hb=f5a77a09c93fe7f04c0c56f64ea436f7d318d674;hp=0000000000000000000000000000000000000000;hpb=75ba6d693b8f6247aa4b81323a2ee2fa28222215;p=u-boot diff --git a/cpu/i386/sc520/sc520.c b/cpu/i386/sc520/sc520.c new file mode 100644 index 0000000000..b958f8dc04 --- /dev/null +++ b/cpu/i386/sc520/sc520.c @@ -0,0 +1,516 @@ +/* + * (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 +#ifdef CONFIG_SC520_SSI +#include +#endif +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +/* + * 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) +{ + /* 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 (CONFIG_SYS_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) +{ + bd_t *bd = gd->bd; + + u32 dram_present=0; + u32 dram_ctrl; +#ifdef CONFIG_SYS_SDRAM_DRCTMCTL + /* these memory control registers are set up in the assember part, + * in sc520_asm.S, during 'mem_init'. If we muck with them here, + * after we are running a stack in RAM, we have troubles. Besides, + * these refresh and delay values are better ? simply specified + * outright in the include/configs/{cfg} file since the HW designer + * simply dictates it. + */ +#else + int val; + + int cas_precharge_delay = CONFIG_SYS_SDRAM_PRECHARGE_DELAY; + int refresh_rate = CONFIG_SYS_SDRAM_REFRESH_RATE; + int ras_cas_delay = CONFIG_SYS_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); +#endif + + /* 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 + + +static struct { + u8 priority; + u16 level_reg; + u8 level_bit; +} sc520_irq[] = { + { SC520_IRQ0, SC520_MPICMODE, 0x01 }, + { SC520_IRQ1, SC520_MPICMODE, 0x02 }, + { SC520_IRQ2, SC520_SL1PICMODE, 0x02 }, + { SC520_IRQ3, SC520_MPICMODE, 0x08 }, + { SC520_IRQ4, SC520_MPICMODE, 0x10 }, + { SC520_IRQ5, SC520_MPICMODE, 0x20 }, + { SC520_IRQ6, SC520_MPICMODE, 0x40 }, + { SC520_IRQ7, SC520_MPICMODE, 0x80 }, + + { SC520_IRQ8, SC520_SL1PICMODE, 0x01 }, + { SC520_IRQ9, SC520_SL1PICMODE, 0x02 }, + { SC520_IRQ10, SC520_SL1PICMODE, 0x04 }, + { SC520_IRQ11, SC520_SL1PICMODE, 0x08 }, + { SC520_IRQ12, SC520_SL1PICMODE, 0x10 }, + { SC520_IRQ13, SC520_SL1PICMODE, 0x20 }, + { SC520_IRQ14, SC520_SL1PICMODE, 0x40 }, + { SC520_IRQ15, SC520_SL1PICMODE, 0x80 } +}; + + +/* The interrupt used for PCI INTA-INTD */ +int sc520_pci_ints[15] = { + -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1 +}; + +/* utility function to configure a pci interrupt */ +int pci_sc520_set_irq(int pci_pin, int irq) +{ + int i; + +# if 1 + printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq); +#endif + if (irq < 0 || irq > 15) { + return -1; /* illegal irq */ + } + + if (pci_pin < 0 || pci_pin > 15) { + return -1; /* illegal pci int pin */ + } + + /* first disable any non-pci interrupt source that use + * this level */ + for (i=SC520_GPTMR0MAP;i<=SC520_GP10IMAP;i++) { + if (i>=SC520_PCIINTAMAP&&i<=SC520_PCIINTDMAP) { + continue; + } + if (read_mmcr_byte(i) == sc520_irq[irq].priority) { + write_mmcr_byte(i, SC520_IRQ_DISABLED); + } + } + + /* Set the trigger to level */ + write_mmcr_byte(sc520_irq[irq].level_reg, + read_mmcr_byte(sc520_irq[irq].level_reg) | sc520_irq[irq].level_bit); + + + if (pci_pin < 4) { + /* PCI INTA-INTD */ + /* route the interrupt */ + write_mmcr_byte(SC520_PCIINTAMAP + pci_pin, sc520_irq[irq].priority); + + + } else { + /* GPIRQ0-GPIRQ10 used for additional PCI INTS */ + write_mmcr_byte(SC520_GP0IMAP + pci_pin - 4, sc520_irq[irq].priority); + + /* also set the polarity in this case */ + write_mmcr_word(SC520_INTPINPOL, + read_mmcr_word(SC520_INTPINPOL) | (1 << (pci_pin-4))); + + } + + /* register the pin */ + sc520_pci_ints[pci_pin] = irq; + + + return 0; /* OK */ +} + +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_SYS_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 CONFIG_SYS_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 + +int ssi_set_interface(int freq, int lsb_first, int inv_clock, int inv_phase) +{ + u8 temp=0; + + if (freq >= 8192) { + temp |= CTL_CLK_SEL_4; + } else if (freq >= 4096) { + temp |= CTL_CLK_SEL_8; + } else if (freq >= 2048) { + temp |= CTL_CLK_SEL_16; + } else if (freq >= 1024) { + temp |= CTL_CLK_SEL_32; + } else if (freq >= 512) { + temp |= CTL_CLK_SEL_64; + } else if (freq >= 256) { + temp |= CTL_CLK_SEL_128; + } else if (freq >= 128) { + temp |= CTL_CLK_SEL_256; + } else { + temp |= CTL_CLK_SEL_512; + } + + if (!lsb_first) { + temp |= MSBF_ENB; + } + + if (inv_clock) { + temp |= CLK_INV_ENB; + } + + if (inv_phase) { + temp |= PHS_INV_ENB; + } + + write_mmcr_byte(SC520_SSICTL, temp); + + return 0; +} + +u8 ssi_txrx_byte(u8 data) +{ + write_mmcr_byte(SC520_SSIXMIT, data); + while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); + write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMITRCV); + while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); + return read_mmcr_byte(SC520_SSIRCV); +} + + +void ssi_tx_byte(u8 data) +{ + write_mmcr_byte(SC520_SSIXMIT, data); + while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); + write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_XMIT); +} + +u8 ssi_rx_byte(void) +{ + while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); + write_mmcr_byte(SC520_SSICMD, SSICMD_CMD_SEL_RCV); + while ((read_mmcr_byte(SC520_SSISTA)) & SSISTA_BSY); + return read_mmcr_byte(SC520_SSIRCV); +} + +#ifdef CONFIG_SYS_RESET_SC520 +void reset_cpu(ulong addr) +{ + printf("Resetting using SC520 MMCR\n"); + /* Write a '1' to the SYS_RST of the RESCFG MMCR */ + write_mmcr_word(SC520_RESCFG, 0x0001); + + /* NOTREACHED */ +} +#endif