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Diffstat (limited to 'board/mpl/common/isa.c')
| -rw-r--r-- | board/mpl/common/isa.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/board/mpl/common/isa.c b/board/mpl/common/isa.c new file mode 100644 index 0000000..40731fc --- /dev/null +++ b/board/mpl/common/isa.c @@ -0,0 +1,469 @@ +/* + * (C) Copyright 2001 + * Denis Peter, MPL AG Switzerland + * + * 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 + * + * + * TODO: clean-up + */ + +#include <common.h> +#include <asm/processor.h> +#include <devices.h> +#include "isa.h" +#include "piix4_pci.h" +#include "kbd.h" +#include "video.h" + +extern int drv_isa_kbd_init (void); + +#undef ISA_DEBUG + +#ifdef ISA_DEBUG +#define PRINTF(fmt,args...) printf (fmt ,##args) +#else +#define PRINTF(fmt,args...) +#endif + +#ifndef TRUE +#define TRUE 1 +#endif +#ifndef FALSE +#define FALSE 0 +#endif + + + +/* fdc (logical device 0) */ +const SIO_LOGDEV_TABLE sio_fdc[] = { + {0x60, 3}, /* set IO to FDPort (3F0) */ + {0x61, 0xF0}, /* set IO to FDPort (3F0) */ + {0x70, 06}, /* set IRQ 6 for FDPort */ + {0x74, 02}, /* set DMA 2 for FDPort */ + {0xF0, 0x05}, /* set to PS2 type */ + {0xF1, 0x00}, /* default value */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; +/* paralell port (logical device 3) */ +const SIO_LOGDEV_TABLE sio_pport[] = { + {0x60, 3}, /* set IO to PPort (378) */ + {0x61, 0x78}, /* set IO to PPort (378) */ + {0x70, 07}, /* set IRQ 7 for PPort */ + {0xF1, 00}, /* set PPort to normal */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; +/* paralell port (logical device 3) Floppy assigned to lpt */ +const SIO_LOGDEV_TABLE sio_pport_fdc[] = { + {0x60, 3}, /* set IO to PPort (378) */ + {0x61, 0x78}, /* set IO to PPort (378) */ + {0x70, 07}, /* set IRQ 7 for PPort */ + {0xF1, 02}, /* set PPort to Floppy */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; +/* uart 1 (logical device 4) */ +const SIO_LOGDEV_TABLE sio_com1[] = { + {0x60, 3}, /* set IO to COM1 (3F8) */ + {0x61, 0xF8}, /* set IO to COM1 (3F8) */ + {0x70, 04}, /* set IRQ 4 for COM1 */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; +/* uart 2 (logical device 5) */ +const SIO_LOGDEV_TABLE sio_com2[] = { + {0x60, 2}, /* set IO to COM2 (2F8) */ + {0x61, 0xF8}, /* set IO to COM2 (2F8) */ + {0x70, 03}, /* set IRQ 3 for COM2 */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; + +/* keyboard controller (logical device 7) */ +const SIO_LOGDEV_TABLE sio_keyboard[] = { + {0x70, 1}, /* set IRQ 1 for keyboard */ + {0x72, 12}, /* set IRQ 12 for mouse */ + {0xF0, 0}, /* disable Port92 (this is a PowerPC!!) */ + {0x30, 1}, /* and activate the device */ + {0xFF, 0} /* end of device table */ +}; + + +/******************************************************************************* +* Config SuperIO FDC37C672 +********************************************************************************/ +unsigned char open_cfg_super_IO(int address) +{ + out8(CFG_ISA_IO_BASE_ADDRESS | address,0x55); /* open config */ + out8(CFG_ISA_IO_BASE_ADDRESS | address,0x20); /* set address to DEV ID */ + if(in8(CFG_ISA_IO_BASE_ADDRESS | address | 0x1)==0x40) /* ok Device ID is correct */ + return TRUE; + else + return FALSE; +} + +void close_cfg_super_IO(int address) +{ + out8(CFG_ISA_IO_BASE_ADDRESS | address,0xAA); /* close config */ +} + + +unsigned char read_cfg_super_IO(int address, unsigned char function, unsigned char regaddr) +{ + /* assuming config reg is open */ + out8(CFG_ISA_IO_BASE_ADDRESS | address,0x7); /* points to the function reg */ + out8(CFG_ISA_IO_BASE_ADDRESS | address | 1,function); /* set the function no */ + out8(CFG_ISA_IO_BASE_ADDRESS | address,regaddr); /* sets the address in the function */ + return in8(CFG_ISA_IO_BASE_ADDRESS | address | 1); +} + +void write_cfg_super_IO(int address, unsigned char function, unsigned char regaddr, unsigned char data) +{ + /* assuming config reg is open */ + out8(CFG_ISA_IO_BASE_ADDRESS | address,0x7); /* points to the function reg */ + out8(CFG_ISA_IO_BASE_ADDRESS | address | 1,function); /* set the function no */ + out8(CFG_ISA_IO_BASE_ADDRESS | address,regaddr); /* sets the address in the function */ + out8(CFG_ISA_IO_BASE_ADDRESS | address | 1,data); /* writes the data */ +} + +void isa_write_table(SIO_LOGDEV_TABLE *ldt,unsigned char ldev) +{ + while (ldt->index != 0xFF) { + write_cfg_super_IO(SIO_CFG_PORT, ldev, ldt->index, ldt->val); + ldt++; + } /* endwhile */ +} + +void isa_sio_loadtable(void) +{ + unsigned char *s = getenv("floppy"); + /* setup Floppy device 0*/ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_fdc,0); + /* setup parallel port device 3 */ + if(s && !strncmp(s, "lpt", 3)) { + printf("SIO: Floppy assigned to LPT\n"); + /* floppy is assigned to the LPT */ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_pport_fdc,3); + } + else { + /*printf("Floppy assigned to internal port\n");*/ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_pport,3); + } + /* setup Com1 port device 4 */ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_com1,4); + /* setup Com2 port device 5 */ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_com2,5); + /* setup keyboards device 7 */ + isa_write_table((SIO_LOGDEV_TABLE *)&sio_keyboard,7); +} + + +void isa_sio_setup(void) +{ + if(open_cfg_super_IO(SIO_CFG_PORT)==TRUE) + { + isa_sio_loadtable(); + close_cfg_super_IO(0x3F0); + } +} + + + +/****************************************************************************** + * IRQ Controller + * we use the Vector mode + */ + +struct isa_irq_action { + interrupt_handler_t *handler; + void *arg; + int count; +}; + +static struct isa_irq_action isa_irqs[16]; + + +/* + * This contains the irq mask for both 8259A irq controllers, + */ +static unsigned int cached_irq_mask = 0xffff; + +#define cached_imr1 (unsigned char)cached_irq_mask +#define cached_imr2 (unsigned char)(cached_irq_mask>>8) +#define IMR_1 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT1_OCW1 +#define IMR_2 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT2_OCW1 +#define ICW1_1 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT1_ICW1 +#define ICW1_2 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT2_ICW1 +#define ICW2_1 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT1_ICW2 +#define ICW2_2 CFG_ISA_IO_BASE_ADDRESS + PIIX4_ISA_INT2_ICW2 +#define ICW3_1 ICW2_1 +#define ICW3_2 ICW2_2 +#define ICW4_1 ICW2_1 +#define ICW4_2 ICW2_2 +#define ISR_1 ICW1_1 +#define ISR_2 ICW1_2 + + +void disable_8259A_irq(unsigned int irq) +{ + unsigned int mask = 1 << irq; + + cached_irq_mask |= mask; + if (irq & 8) + out8(IMR_2,cached_imr2); + else + out8(IMR_1,cached_imr1); +} + +void enable_8259A_irq(unsigned int irq) +{ + unsigned int mask = ~(1 << irq); + + cached_irq_mask &= mask; + if (irq & 8) + out8(IMR_2,cached_imr2); + else + out8(IMR_1,cached_imr1); +} +/* +int i8259A_irq_pending(unsigned int irq) +{ + unsigned int mask = 1<<irq; + int ret; + + if (irq < 8) + ret = inb(0x20) & mask; + else + ret = inb(0xA0) & (mask >> 8); + spin_unlock_irqrestore(&i8259A_lock, flags); + + return ret; +} +*/ + +/* + * This function assumes to be called rarely. Switching between + * 8259A registers is slow. + */ +int i8259A_irq_real(unsigned int irq) +{ + int value; + int irqmask = 1<<irq; + + if (irq < 8) { + out8(ISR_1,0x0B); /* ISR register */ + value = in8(ISR_1) & irqmask; + out8(ISR_1,0x0A); /* back to the IRR register */ + return value; + } + out8(ISR_2,0x0B); /* ISR register */ + value = in8(ISR_2) & (irqmask >> 8); + out8(ISR_2,0x0A); /* back to the IRR register */ + return value; +} + +/* + * Careful! The 8259A is a fragile beast, it pretty + * much _has_ to be done exactly like this (mask it + * first, _then_ send the EOI, and the order of EOI + * to the two 8259s is important! + */ +void mask_and_ack_8259A(unsigned int irq) +{ + unsigned int irqmask = 1 << irq; + unsigned int temp_irqmask = cached_irq_mask; + /* + * Lightweight spurious IRQ detection. We do not want + * to overdo spurious IRQ handling - it's usually a sign + * of hardware problems, so we only do the checks we can + * do without slowing down good hardware unnecesserily. + * + * Note that IRQ7 and IRQ15 (the two spurious IRQs + * usually resulting from the 8259A-1|2 PICs) occur + * even if the IRQ is masked in the 8259A. Thus we + * can check spurious 8259A IRQs without doing the + * quite slow i8259A_irq_real() call for every IRQ. + * This does not cover 100% of spurious interrupts, + * but should be enough to warn the user that there + * is something bad going on ... + */ + if (temp_irqmask & irqmask) + goto spurious_8259A_irq; + temp_irqmask |= irqmask; + +handle_real_irq: + if (irq & 8) { + in8(IMR_2); /* DUMMY - (do we need this?) */ + out8(IMR_2,(unsigned char)(temp_irqmask>>8)); + out8(ISR_2,0x60+(irq&7));/* 'Specific EOI' to slave */ + out8(ISR_1,0x62); /* 'Specific EOI' to master-IRQ2 */ + out8(IMR_2,cached_imr2); /* turn it on again */ + } else { + in8(IMR_1); /* DUMMY - (do we need this?) */ + out8(IMR_1,(unsigned char)temp_irqmask); + out8(ISR_1,0x60+irq); /* 'Specific EOI' to master */ + out8(IMR_1,cached_imr1); /* turn it on again */ + } + + return; + +spurious_8259A_irq: + /* + * this is the slow path - should happen rarely. + */ + if (i8259A_irq_real(irq)) + /* + * oops, the IRQ _is_ in service according to the + * 8259A - not spurious, go handle it. + */ + goto handle_real_irq; + + { + static int spurious_irq_mask; + /* + * At this point we can be sure the IRQ is spurious, + * lets ACK and report it. [once per IRQ] + */ + if (!(spurious_irq_mask & irqmask)) { + PRINTF("spurious 8259A interrupt: IRQ%d.\n", irq); + spurious_irq_mask |= irqmask; + } + /* irq_err_count++; */ + /* + * Theoretically we do not have to handle this IRQ, + * but in Linux this does not cause problems and is + * simpler for us. + */ + goto handle_real_irq; + } +} + +void init_8259A(void) +{ + out8(IMR_1,0xff); /* mask all of 8259A-1 */ + out8(IMR_2,0xff); /* mask all of 8259A-2 */ + + out8(ICW1_1,0x11); /* ICW1: select 8259A-1 init */ + out8(ICW2_1,0x20 + 0); /* ICW2: 8259A-1 IR0-7 mapped to 0x20-0x27 */ + out8(ICW3_1,0x04); /* 8259A-1 (the master) has a slave on IR2 */ + out8(ICW4_1,0x01); /* master expects normal EOI */ + out8(ICW1_2,0x11); /* ICW2: select 8259A-2 init */ + out8(ICW2_2,0x20 + 8); /* ICW2: 8259A-2 IR0-7 mapped to 0x28-0x2f */ + out8(ICW3_2,0x02); /* 8259A-2 is a slave on master's IR2 */ + out8(ICW4_2,0x01); /* (slave's support for AEOI in flat mode + is to be investigated) */ + udelay(10000); /* wait for 8259A to initialize */ + out8(IMR_1,cached_imr1); /* restore master IRQ mask */ + udelay(10000); /* wait for 8259A to initialize */ + out8(IMR_2,cached_imr2); /* restore slave IRQ mask */ +} + + +#define PCI_INT_ACK_ADDR 0xEED00000 + +int handle_isa_int(void) +{ + unsigned long irqack; + unsigned char isr1,isr2,irq; + /* first we acknokledge the int via the PCI bus */ + irqack=in32(PCI_INT_ACK_ADDR); + /* now we get the ISRs */ + isr2=in8(ISR_2); + isr1=in8(ISR_1); + irq=(unsigned char)irqack; + if((irq==7)&&((isr1&0x80)==0)) { + PRINTF("IRQ7 detected but not in ISR\n"); + } + else { + /* we should handle cascaded interrupts here also */ + /* printf("ISA Irq %d\n",irq); */ + isa_irqs[irq].count++; + if (isa_irqs[irq].handler != NULL) + (*isa_irqs[irq].handler)(isa_irqs[irq].arg); /* call isr */ + else + { + PRINTF ("bogus interrupt vector 0x%x\n", irq); + } + } + /* issue EOI instruction to clear the IRQ */ + mask_and_ack_8259A(irq); + return 0; +} + + + +/****************************************************************** + * Install and free an ISA interrupt handler. + */ + +void isa_irq_install_handler(int vec, interrupt_handler_t *handler, void *arg) +{ + if (isa_irqs[vec].handler != NULL) { + printf ("ISA Interrupt vector %d: handler 0x%x replacing 0x%x\n", + vec, (uint)handler, (uint)isa_irqs[vec].handler); + } + isa_irqs[vec].handler = handler; + isa_irqs[vec].arg = arg; + enable_8259A_irq(vec); + PRINTF ("Install ISA IRQ %d ==> %p, @ %p mask=%04x\n", vec, handler, &isa_irqs[vec].handler,cached_irq_mask); + +} + +void isa_irq_free_handler(int vec) +{ + disable_8259A_irq(vec); + isa_irqs[vec].handler = NULL; + isa_irqs[vec].arg = NULL; + printf ("Free ISA IRQ %d mask=%04x\n", vec, cached_irq_mask); + +} + +/****************************************************************************/ +void isa_init_irq_contr(void) +{ + int i; + /* disable all Interrupts */ + /* first write icws controller 1 */ + for(i=0;i<16;i++) + { + isa_irqs[i].handler=NULL; + isa_irqs[i].arg=NULL; + isa_irqs[i].count=0; + } + init_8259A(); + out8(IMR_2,0xFF); +} + + +/****************************************************************** + * Init the ISA bus and devices. + */ + + +int isa_init(void) +{ + isa_sio_setup(); + drv_isa_kbd_init(); + return 0; +} + + + |