diff options
Diffstat (limited to 'arch/sh/boards/renesas/hs7751rvoip/pci.c')
| -rw-r--r-- | arch/sh/boards/renesas/hs7751rvoip/pci.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/sh/boards/renesas/hs7751rvoip/pci.c b/arch/sh/boards/renesas/hs7751rvoip/pci.c new file mode 100644 index 00000000000..7a442d1eca4 --- /dev/null +++ b/arch/sh/boards/renesas/hs7751rvoip/pci.c @@ -0,0 +1,150 @@ +/* + * linux/arch/sh/kernel/pci-hs7751rvoip.c + * + * Author: Ian DaSilva (idasilva@mvista.com) + * + * Highly leveraged from pci-bigsur.c, written by Dustin McIntire. + * + * May be copied or modified under the terms of the GNU General Public + * License. See linux/COPYING for more information. + * + * PCI initialization for the Renesas SH7751R HS7751RVoIP board + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/module.h> + +#include <asm/io.h> +#include "../../../drivers/pci/pci-sh7751.h" +#include <asm/hs7751rvoip/hs7751rvoip.h> + +#define PCIMCR_MRSET_OFF 0xBFFFFFFF +#define PCIMCR_RFSH_OFF 0xFFFFFFFB + +/* + * 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 __init pcibios_init_platform(void) +{ + unsigned long bcr1, wcr1, wcr2, wcr3, mcr; + unsigned short bcr2, bcr3; + + /* + * 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)); + bcr3 = (*(volatile unsigned short *)(SH7751_BCR3)); + 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 | 0x00080000; /* Enable Bit 19, BREQEN */ + (*(volatile unsigned long *)(SH7751_BCR1)) = bcr1; + + bcr1 = bcr1 | 0x40080000; /* 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_PCIBCR3, bcr3); /* PCIC BCR3 */ + 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, 0x0000c3ff); + PCIC_WRITE(SH7751_PCIAINTM, 0x0000380f); + + /* Set up standard PCI config registers */ + PCIC_WRITE(SH7751_PCICONF1, 0xFB900047); /* Bus Master, Mem & I/O access */ + PCIC_WRITE(SH7751_PCICONF2, 0x00000000); /* PCI Class code & Revision ID */ + PCIC_WRITE(SH7751_PCICONF4, 0xab000001); /* PCI I/O address (local regs) */ + PCIC_WRITE(SH7751_PCICONF5, 0x0c000000); /* PCI MEM address (local RAM) */ + PCIC_WRITE(SH7751_PCICONF6, 0xd0000000); /* PCI MEM address (unused) */ + PCIC_WRITE(SH7751_PCICONF11, 0x35051054); /* PCI Subsystem ID & Vendor ID */ + PCIC_WRITE(SH7751_PCILSR0, 0x03f00000); /* MEM (full 64M exposed) */ + PCIC_WRITE(SH7751_PCILSR1, 0x00000000); /* MEM (unused) */ + PCIC_WRITE(SH7751_PCILAR0, 0x0c000000); /* MEM (direct map from PCI) */ + PCIC_WRITE(SH7751_PCILAR1, 0x00000000); /* MEM (unused) */ + + /* Now turn it on... */ + PCIC_WRITE(SH7751_PCICR, 0xa5000001); + + /* + * Set PCIMBR and PCIIOBR here, assuming a single window + * (16M MEM, 256K 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 ifdef to + * catch erroneous assumption. + */ + BUG_ON(PCIBIOS_MIN_MEM != SH7751_PCI_MEMORY_BASE); + + PCIC_WRITE(SH7751_PCIMBR, PCIBIOS_MIN_MEM); + + /* Set IOBR for window containing area specified in pci.h */ + PCIC_WRITE(SH7751_PCIIOBR, (PCIBIOS_MIN_IO & SH7751_PCIIOBR_MASK)); + + /* All done, may as well say so... */ + printk("SH7751R PCI: Finished initialization of the PCI controller\n"); + + return 1; +} + +int __init pcibios_map_platform_irq(u8 slot, u8 pin) +{ + switch (slot) { + case 0: return IRQ_PCISLOT; /* PCI Extend slot */ + case 1: return IRQ_PCMCIA; /* PCI Cardbus Bridge */ + case 2: return IRQ_PCIETH; /* Realtek Ethernet controller */ + case 3: return IRQ_PCIHUB; /* Realtek Ethernet Hub controller */ + default: + printk("PCI: Bad IRQ mapping request for slot %d\n", slot); + return -1; + } +} + +static struct resource sh7751_io_resource = { + .name = "SH7751_IO", + .start = 0x4000, + .end = 0x4000 + SH7751_PCI_IO_SIZE - 1, + .flags = IORESOURCE_IO +}; + +static struct resource sh7751_mem_resource = { + .name = "SH7751_mem", + .start = SH7751_PCI_MEMORY_BASE, + .end = SH7751_PCI_MEMORY_BASE + SH7751_PCI_MEM_SIZE - 1, + .flags = IORESOURCE_MEM +}; + +extern struct pci_ops sh7751_pci_ops; + +struct pci_channel board_pci_channels[] = { + { &sh7751_pci_ops, &sh7751_io_resource, &sh7751_mem_resource, 0, 0xff }, + { NULL, NULL, NULL, 0, 0 }, +}; +EXPORT_SYMBOL(board_pci_channels); |