// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/sh_intc.h>
#include "pci-sh4.h"
int pcibios_map_platform_irq(const struct pci_dev *, u8 slot, u8 pin)
{
switch (slot) {
case 0 : return evt2irq(0 x3a0);
case 1 : return evt2irq(0 x3a0); /* AMD Ethernet controller */
case 2 : return -1 ;
case 3 : return -1 ;
case 4 : return -1 ;
default :
printk("PCI: Bad IRQ mapping request for slot %d\n" , slot);
return -1 ;
}
}
#define PCIMCR_MRSET_OFF 0 xBFFFFFFF
#define PCIMCR_RFSH_OFF 0 xFFFFFFFB
/*
* Only long word accesses of the PCIC ' s internal local registers and the
* configuration registers from the CPU is supported .
*/
#define PCIC_WRITE(x,v) writel((v), PCI_REG(x))
#define PCIC_READ(x) readl(PCI_REG(x))
/*
* Description : This function sets up and initializes the pcic , sets
* up the BARS , maps the DRAM into the address space etc , etc .
*/
int pci_fixup_pcic(struct pci_channel *chan)
{
unsigned long bcr1, wcr1, wcr2, wcr3, mcr;
unsigned short bcr2;
/*
* Initialize the slave bus controller on the pcic . The values used
* here should not be hardcoded , but they should be taken from the bsc
* on the processor , to make this function as generic as possible .
* ( i . e . Another sbc may usr different SDRAM timing settings - - in order
* for the pcic to work , its settings need to be exactly the same . )
*/
bcr1 = (*(volatile unsigned long *)(SH7751_BCR1));
bcr2 = (*(volatile unsigned short *)(SH7751_BCR2));
wcr1 = (*(volatile unsigned long *)(SH7751_WCR1));
wcr2 = (*(volatile unsigned long *)(SH7751_WCR2));
wcr3 = (*(volatile unsigned long *)(SH7751_WCR3));
mcr = (*(volatile unsigned long *)(SH7751_MCR));
bcr1 = bcr1 | 0 x00080000; /* Enable Bit 19, BREQEN */
(*(volatile unsigned long *)(SH7751_BCR1)) = bcr1;
bcr1 = bcr1 | 0 x40080000; /* Enable Bit 19 BREQEN, set PCIC to slave */
PCIC_WRITE(SH7751_PCIBCR1, bcr1); /* PCIC BCR1 */
PCIC_WRITE(SH7751_PCIBCR2, bcr2); /* PCIC BCR2 */
PCIC_WRITE(SH7751_PCIWCR1, wcr1); /* PCIC WCR1 */
PCIC_WRITE(SH7751_PCIWCR2, wcr2); /* PCIC WCR2 */
PCIC_WRITE(SH7751_PCIWCR3, wcr3); /* PCIC WCR3 */
mcr = (mcr & PCIMCR_MRSET_OFF) & PCIMCR_RFSH_OFF;
PCIC_WRITE(SH7751_PCIMCR, mcr); /* PCIC MCR */
/* Enable all interrupts, so we know what to fix */
PCIC_WRITE(SH7751_PCIINTM, 0 x0000c3ff);
PCIC_WRITE(SH7751_PCIAINTM, 0 x0000380f);
/* Set up standard PCI config registers */
PCIC_WRITE(SH7751_PCICONF1, 0 xF39000C7); /* Bus Master, Mem & I/O access */
PCIC_WRITE(SH7751_PCICONF2, 0 x00000000); /* PCI Class code & Revision ID */
PCIC_WRITE(SH7751_PCICONF4, 0 xab000001); /* PCI I/O address (local regs) */
PCIC_WRITE(SH7751_PCICONF5, 0 x0c000000); /* PCI MEM address (local RAM) */
PCIC_WRITE(SH7751_PCICONF6, 0 xd0000000); /* PCI MEM address (unused) */
PCIC_WRITE(SH7751_PCICONF11, 0 x35051054); /* PCI Subsystem ID & Vendor ID */
PCIC_WRITE(SH7751_PCILSR0, 0 x03f00000); /* MEM (full 64M exposed) */
PCIC_WRITE(SH7751_PCILSR1, 0 x00000000); /* MEM (unused) */
PCIC_WRITE(SH7751_PCILAR0, 0 x0c000000); /* MEM (direct map from PCI) */
PCIC_WRITE(SH7751_PCILAR1, 0 x00000000); /* MEM (unused) */
/* Now turn it on... */
PCIC_WRITE(SH7751_PCICR, 0 xa5000001);
/*
* Set PCIMBR and PCIIOBR here , assuming a single window
* ( 16 M MEM , 256 K IO ) is enough . If a larger space is
* needed , the readx / writex and inx / outx functions will
* have to do more ( e . g . setting registers for each call ) .
*/
/*
* Set the MBR so PCI address is one - to - one with window ,
* meaning all calls go straight through . . . use BUG_ON to
* catch erroneous assumption .
*/
BUG_ON(chan->resources[1 ].start != SH7751_PCI_MEMORY_BASE);
PCIC_WRITE(SH7751_PCIMBR, chan->resources[1 ].start);
/* Set IOBR for window containing area specified in pci.h */
PCIC_WRITE(SH7751_PCIIOBR, (chan->resources[0 ].start & SH7751_PCIIOBR_MASK));
/* All done, may as well say so... */
printk("SH7751 PCI: Finished initialization of the PCI controller\n" );
return 1 ;
}
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(vorverarbeitet am 2026-09-28)
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