diff options
Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/platforms/chrp/pci.c | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/chrp/pci.c b/arch/powerpc/platforms/chrp/pci.c new file mode 100644 index 000000000..6f6598e77 --- /dev/null +++ b/arch/powerpc/platforms/chrp/pci.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CHRP pci routines. + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/pgtable.h> +#include <linux/of_address.h> + +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/hydra.h> +#include <asm/machdep.h> +#include <asm/sections.h> +#include <asm/pci-bridge.h> +#include <asm/grackle.h> +#include <asm/rtas.h> + +#include "chrp.h" +#include "gg2.h" + +/* LongTrail */ +void __iomem *gg2_pci_config_base; + +/* + * The VLSI Golden Gate II has only 512K of PCI configuration space, so we + * limit the bus number to 3 bits + */ + +static int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off, + int len, u32 *val) +{ + volatile void __iomem *cfg_data; + struct pci_controller *hose = pci_bus_to_host(bus); + + if (bus->number > 7) + return PCIBIOS_DEVICE_NOT_FOUND; + /* + * Note: the caller has already checked that off is + * suitably aligned and that len is 1, 2 or 4. + */ + cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off); + switch (len) { + case 1: + *val = in_8(cfg_data); + break; + case 2: + *val = in_le16(cfg_data); + break; + default: + *val = in_le32(cfg_data); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off, + int len, u32 val) +{ + volatile void __iomem *cfg_data; + struct pci_controller *hose = pci_bus_to_host(bus); + + if (bus->number > 7) + return PCIBIOS_DEVICE_NOT_FOUND; + /* + * Note: the caller has already checked that off is + * suitably aligned and that len is 1, 2 or 4. + */ + cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off); + switch (len) { + case 1: + out_8(cfg_data, val); + break; + case 2: + out_le16(cfg_data, val); + break; + default: + out_le32(cfg_data, val); + break; + } + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops gg2_pci_ops = +{ + .read = gg2_read_config, + .write = gg2_write_config, +}; + +/* + * Access functions for PCI config space using RTAS calls. + */ +static int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset, + int len, u32 *val) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8) + | (((bus->number - hose->first_busno) & 0xff) << 16) + | (hose->global_number << 24); + int ret = -1; + int rval; + + rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len); + *val = ret; + return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL; +} + +static int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset, + int len, u32 val) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8) + | (((bus->number - hose->first_busno) & 0xff) << 16) + | (hose->global_number << 24); + int rval; + + rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL, + addr, len, val); + return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops rtas_pci_ops = +{ + .read = rtas_read_config, + .write = rtas_write_config, +}; + +volatile struct Hydra __iomem *Hydra = NULL; + +static int __init hydra_init(void) +{ + struct device_node *np; + struct resource r; + + np = of_find_node_by_name(NULL, "mac-io"); + if (np == NULL || of_address_to_resource(np, 0, &r)) { + of_node_put(np); + return 0; + } + of_node_put(np); + Hydra = ioremap(r.start, resource_size(&r)); + printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start); + printk("Hydra Feature_Control was %x", + in_le32(&Hydra->Feature_Control)); + out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN | + HYDRA_FC_SCSI_CELL_EN | + HYDRA_FC_SCCA_ENABLE | + HYDRA_FC_SCCB_ENABLE | + HYDRA_FC_ARB_BYPASS | + HYDRA_FC_MPIC_ENABLE | + HYDRA_FC_SLOW_SCC_PCLK | + HYDRA_FC_MPIC_IS_MASTER)); + printk(", now %x\n", in_le32(&Hydra->Feature_Control)); + return 1; +} + +#define PRG_CL_RESET_VALID 0x00010000 + +static void __init +setup_python(struct pci_controller *hose, struct device_node *dev) +{ + u32 __iomem *reg; + u32 val; + struct resource r; + + if (of_address_to_resource(dev, 0, &r)) { + printk(KERN_ERR "No address for Python PCI controller\n"); + return; + } + + /* Clear the magic go-slow bit */ + reg = ioremap(r.start + 0xf6000, 0x40); + BUG_ON(!reg); + val = in_be32(®[12]); + if (val & PRG_CL_RESET_VALID) { + out_be32(®[12], val & ~PRG_CL_RESET_VALID); + in_be32(®[12]); + } + iounmap(reg); + + setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010, 0); +} + +/* Marvell Discovery II based Pegasos 2 */ +static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev) +{ + struct device_node *root = of_find_node_by_path("/"); + struct device_node *rtas; + + rtas = of_find_node_by_name (root, "rtas"); + if (rtas) { + hose->ops = &rtas_pci_ops; + of_node_put(rtas); + } else { + printk ("RTAS supporting Pegasos OF not found, please upgrade" + " your firmware\n"); + } + pci_add_flags(PCI_REASSIGN_ALL_BUS); + /* keep the reference to the root node */ +} + +void __init +chrp_find_bridges(void) +{ + struct device_node *dev; + const int *bus_range; + int len, index = -1; + struct pci_controller *hose; + const unsigned int *dma; + const char *model, *machine; + int is_longtrail = 0, is_mot = 0, is_pegasos = 0; + struct device_node *root = of_find_node_by_path("/"); + struct resource r; + /* + * The PCI host bridge nodes on some machines don't have + * properties to adequately identify them, so we have to + * look at what sort of machine this is as well. + */ + machine = of_get_property(root, "model", NULL); + if (machine != NULL) { + is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0; + is_mot = strncmp(machine, "MOT", 3) == 0; + if (strncmp(machine, "Pegasos2", 8) == 0) + is_pegasos = 2; + else if (strncmp(machine, "Pegasos", 7) == 0) + is_pegasos = 1; + } + for_each_child_of_node(root, dev) { + if (!of_node_is_type(dev, "pci")) + continue; + ++index; + /* The GG2 bridge on the LongTrail doesn't have an address */ + if (of_address_to_resource(dev, 0, &r) && !is_longtrail) { + printk(KERN_WARNING "Can't use %pOF: no address\n", + dev); + continue; + } + bus_range = of_get_property(dev, "bus-range", &len); + if (bus_range == NULL || len < 2 * sizeof(int)) { + printk(KERN_WARNING "Can't get bus-range for %pOF\n", + dev); + continue; + } + if (bus_range[1] == bus_range[0]) + printk(KERN_INFO "PCI bus %d", bus_range[0]); + else + printk(KERN_INFO "PCI buses %d..%d", + bus_range[0], bus_range[1]); + printk(" controlled by %pOF", dev); + if (!is_longtrail) + printk(" at %llx", (unsigned long long)r.start); + printk("\n"); + + hose = pcibios_alloc_controller(dev); + if (!hose) { + printk("Can't allocate PCI controller structure for %pOF\n", + dev); + continue; + } + hose->first_busno = hose->self_busno = bus_range[0]; + hose->last_busno = bus_range[1]; + + model = of_get_property(dev, "model", NULL); + if (model == NULL) + model = "<none>"; + if (strncmp(model, "IBM, Python", 11) == 0) { + setup_python(hose, dev); + } else if (is_mot + || strncmp(model, "Motorola, Grackle", 17) == 0) { + setup_grackle(hose); + } else if (is_longtrail) { + void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000); + hose->ops = &gg2_pci_ops; + hose->cfg_data = p; + gg2_pci_config_base = p; + } else if (is_pegasos == 1) { + setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc, 0); + } else if (is_pegasos == 2) { + setup_peg2(hose, dev); + } else if (!strncmp(model, "IBM,CPC710", 10)) { + setup_indirect_pci(hose, + r.start + 0x000f8000, + r.start + 0x000f8010, + 0); + if (index == 0) { + dma = of_get_property(dev, "system-dma-base", + &len); + if (dma && len >= sizeof(*dma)) { + dma = (unsigned int *) + (((unsigned long)dma) + + len - sizeof(*dma)); + pci_dram_offset = *dma; + } + } + } else { + printk("No methods for %pOF (model %s), using RTAS\n", + dev, model); + hose->ops = &rtas_pci_ops; + } + + pci_process_bridge_OF_ranges(hose, dev, index == 0); + + /* check the first bridge for a property that we can + use to set pci_dram_offset */ + dma = of_get_property(dev, "ibm,dma-ranges", &len); + if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) { + pci_dram_offset = dma[2] - dma[3]; + printk("pci_dram_offset = %lx\n", pci_dram_offset); + } + } + of_node_put(root); + + /* + * "Temporary" fixes for PCI devices. + * -- Geert + */ + hydra_init(); /* Mac I/O */ + + pci_create_OF_bus_map(); +} + +/* SL82C105 IDE Control/Status Register */ +#define SL82C105_IDECSR 0x40 + +/* Fixup for Winbond ATA quirk, required for briq mostly because the + * 8259 is configured for level sensitive IRQ 14 and so wants the + * ATA controller to be set to fully native mode or bad things + * will happen. + */ +static void chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105) +{ + u8 progif; + + /* If non-briq machines need that fixup too, please speak up */ + if (!machine_is(chrp) || _chrp_type != _CHRP_briq) + return; + + if ((sl82c105->class & 5) != 5) { + printk("W83C553: Switching SL82C105 IDE to PCI native mode\n"); + /* Enable SL82C105 PCI native IDE mode */ + pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif); + pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05); + sl82c105->class |= 0x05; + /* Disable SL82C105 second port */ + pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003); + /* Clear IO BARs, they will be reassigned */ + pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_0, 0); + pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_1, 0); + pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_2, 0); + pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_3, 0); + } +} +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, + chrp_pci_fixup_winbond_ata); + +/* Pegasos2 firmware version 20040810 configures the built-in IDE controller + * in legacy mode, but sets the PCI registers to PCI native mode. + * The chip can only operate in legacy mode, so force the PCI class into legacy + * mode as well. The same fixup must be done to the class-code property in + * the IDE node /pci@80000000/ide@C,1 + */ +static void chrp_pci_fixup_vt8231_ata(struct pci_dev *viaide) +{ + u8 progif; + struct pci_dev *viaisa; + + if (!machine_is(chrp) || _chrp_type != _CHRP_Pegasos) + return; + if (viaide->irq != 14) + return; + + viaisa = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL); + if (!viaisa) + return; + dev_info(&viaide->dev, "Fixing VIA IDE, force legacy mode on\n"); + + pci_read_config_byte(viaide, PCI_CLASS_PROG, &progif); + pci_write_config_byte(viaide, PCI_CLASS_PROG, progif & ~0x5); + viaide->class &= ~0x5; + + pci_dev_put(viaisa); +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, chrp_pci_fixup_vt8231_ata); |