diff options
Diffstat (limited to 'arch/sh/drivers/pci/pci-sh7751.c')
| -rw-r--r-- | arch/sh/drivers/pci/pci-sh7751.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/pci-sh7751.c b/arch/sh/drivers/pci/pci-sh7751.c new file mode 100644 index 0000000000..11ed21c2e9 --- /dev/null +++ b/arch/sh/drivers/pci/pci-sh7751.c @@ -0,0 +1,179 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Low-Level PCI Support for the SH7751 + * + * Copyright (C) 2003 - 2009 Paul Mundt + * Copyright (C) 2001 Dustin McIntire + * + * With cleanup by Paul van Gool <pvangool@mimotech.com>, 2003. + */ +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/io.h> +#include "pci-sh4.h" +#include <asm/addrspace.h> +#include <linux/sizes.h> + +static int __init __area_sdram_check(struct pci_channel *chan, + unsigned int area) +{ + unsigned long word; + + word = __raw_readl(SH7751_BCR1); + /* check BCR for SDRAM in area */ + if (((word >> area) & 1) == 0) { + printk("PCI: Area %d is not configured for SDRAM. BCR1=0x%lx\n", + area, word); + return 0; + } + pci_write_reg(chan, word, SH4_PCIBCR1); + + word = __raw_readw(SH7751_BCR2); + /* check BCR2 for 32bit SDRAM interface*/ + if (((word >> (area << 1)) & 0x3) != 0x3) { + printk("PCI: Area %d is not 32 bit SDRAM. BCR2=0x%lx\n", + area, word); + return 0; + } + pci_write_reg(chan, word, SH4_PCIBCR2); + + return 1; +} + +static struct resource sh7751_pci_resources[] = { + { + .name = "SH7751_IO", + .start = 0x1000, + .end = SZ_4M - 1, + .flags = IORESOURCE_IO + }, { + .name = "SH7751_mem", + .start = SH7751_PCI_MEMORY_BASE, + .end = SH7751_PCI_MEMORY_BASE + SH7751_PCI_MEM_SIZE - 1, + .flags = IORESOURCE_MEM + }, +}; + +static struct pci_channel sh7751_pci_controller = { + .pci_ops = &sh4_pci_ops, + .resources = sh7751_pci_resources, + .nr_resources = ARRAY_SIZE(sh7751_pci_resources), + .mem_offset = 0x00000000, + .io_offset = 0x00000000, + .io_map_base = SH7751_PCI_IO_BASE, +}; + +static struct sh4_pci_address_map sh7751_pci_map = { + .window0 = { + .base = SH7751_CS3_BASE_ADDR, + .size = 0x04000000, + }, +}; + +static int __init sh7751_pci_init(void) +{ + struct pci_channel *chan = &sh7751_pci_controller; + unsigned int id; + u32 word, reg; + + printk(KERN_NOTICE "PCI: Starting initialization.\n"); + + chan->reg_base = 0xfe200000; + + /* check for SH7751/SH7751R hardware */ + id = pci_read_reg(chan, SH7751_PCICONF0); + if (id != ((SH7751_DEVICE_ID << 16) | SH7751_VENDOR_ID) && + id != ((SH7751R_DEVICE_ID << 16) | SH7751_VENDOR_ID)) { + pr_debug("PCI: This is not an SH7751(R) (%x)\n", id); + return -ENODEV; + } + + /* Set the BCR's to enable PCI access */ + reg = __raw_readl(SH7751_BCR1); + reg |= 0x80000; + __raw_writel(reg, SH7751_BCR1); + + /* Turn the clocks back on (not done in reset)*/ + pci_write_reg(chan, 0, SH4_PCICLKR); + /* Clear Powerdown IRQ's (not done in reset) */ + word = SH4_PCIPINT_D3 | SH4_PCIPINT_D0; + pci_write_reg(chan, word, SH4_PCIPINT); + + /* set the command/status bits to: + * Wait Cycle Control + Parity Enable + Bus Master + + * Mem space enable + */ + word = SH7751_PCICONF1_WCC | SH7751_PCICONF1_PER | + SH7751_PCICONF1_BUM | SH7751_PCICONF1_MES; + pci_write_reg(chan, word, SH7751_PCICONF1); + + /* define this host as the host bridge */ + word = PCI_BASE_CLASS_BRIDGE << 24; + pci_write_reg(chan, word, SH7751_PCICONF2); + + /* Set IO and Mem windows to local address + * Make PCI and local address the same for easy 1 to 1 mapping + */ + word = sh7751_pci_map.window0.size - 1; + pci_write_reg(chan, word, SH4_PCILSR0); + /* Set the values on window 0 PCI config registers */ + word = P2SEGADDR(sh7751_pci_map.window0.base); + pci_write_reg(chan, word, SH4_PCILAR0); + pci_write_reg(chan, word, SH7751_PCICONF5); + + /* Set the local 16MB PCI memory space window to + * the lowest PCI mapped address + */ + word = chan->resources[1].start & SH4_PCIMBR_MASK; + pr_debug("PCI: Setting upper bits of Memory window to 0x%x\n", word); + pci_write_reg(chan, word , SH4_PCIMBR); + + /* Make sure the MSB's of IO window are set to access PCI space + * correctly */ + word = chan->resources[0].start & SH4_PCIIOBR_MASK; + pr_debug("PCI: Setting upper bits of IO window to 0x%x\n", word); + pci_write_reg(chan, word, SH4_PCIIOBR); + + /* Set PCI WCRx, BCRx's, copy from BSC locations */ + + /* check BCR for SDRAM in specified area */ + switch (sh7751_pci_map.window0.base) { + case SH7751_CS0_BASE_ADDR: word = __area_sdram_check(chan, 0); break; + case SH7751_CS1_BASE_ADDR: word = __area_sdram_check(chan, 1); break; + case SH7751_CS2_BASE_ADDR: word = __area_sdram_check(chan, 2); break; + case SH7751_CS3_BASE_ADDR: word = __area_sdram_check(chan, 3); break; + case SH7751_CS4_BASE_ADDR: word = __area_sdram_check(chan, 4); break; + case SH7751_CS5_BASE_ADDR: word = __area_sdram_check(chan, 5); break; + case SH7751_CS6_BASE_ADDR: word = __area_sdram_check(chan, 6); break; + } + + if (!word) + return -1; + + /* configure the wait control registers */ + word = __raw_readl(SH7751_WCR1); + pci_write_reg(chan, word, SH4_PCIWCR1); + word = __raw_readl(SH7751_WCR2); + pci_write_reg(chan, word, SH4_PCIWCR2); + word = __raw_readl(SH7751_WCR3); + pci_write_reg(chan, word, SH4_PCIWCR3); + word = __raw_readl(SH7751_MCR); + pci_write_reg(chan, word, SH4_PCIMCR); + + /* NOTE: I'm ignoring the PCI error IRQs for now.. + * TODO: add support for the internal error interrupts and + * DMA interrupts... + */ + + pci_fixup_pcic(chan); + + /* SH7751 init done, set central function init complete */ + /* use round robin mode to stop a device starving/overruning */ + word = SH4_PCICR_PREFIX | SH4_PCICR_CFIN | SH4_PCICR_ARBM; + pci_write_reg(chan, word, SH4_PCICR); + + return register_pci_controller(chan); +} +arch_initcall(sh7751_pci_init); |