diff options
Diffstat (limited to 'target/linux/olpc/files/arch/i386/pci')
| -rw-r--r-- | target/linux/olpc/files/arch/i386/pci/olpc.c | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/target/linux/olpc/files/arch/i386/pci/olpc.c b/target/linux/olpc/files/arch/i386/pci/olpc.c deleted file mode 100644 index 1518d254c5..0000000000 --- a/target/linux/olpc/files/arch/i386/pci/olpc.c +++ /dev/null @@ -1,298 +0,0 @@ -/* - * olpcpci.c - Low-level PCI config space access for OLPC systems - * without the VSA PCI virtualization software. - * - * The AMD Geode chipset (GX2 processor, cs5536 I/O companion device) - * has some I/O functions (display, southbridge, sound, USB HCIs, etc) - * that more or less behave like PCI devices, but the hardware doesn't - * directly implement the PCI configuration space headers. AMD provides - * "VSA" (Virtual System Architecture) software that emulates PCI config - * space for these devices, by trapping I/O accesses to PCI config register - * (CF8/CFC) and running some code in System Management Mode interrupt state. - * On the OLPC platform, we don't want to use that VSA code because - * (a) it slows down suspend/resume, and (b) recompiling it requires special - * compilers that are hard to get. So instead of letting the complex VSA - * code simulate the PCI config registers for the on-chip devices, we - * just simulate them the easy way, by inserting the code into the - * pci_write_config and pci_read_config path. Most of the config registers - * are read-only anyway, so the bulk of the simulation is just table lookup. - */ - -#include <linux/pci.h> -#include <linux/init.h> -#include <asm/olpc.h> -#include <asm/geode.h> -#include "pci.h" - -static int is_lx; - -/* - * In the tables below, the first two line (8 longwords) are the - * size masks that are used when the higher level PCI code determines - * the size of the region by writing ~0 to a base address register - * and reading back the result. - * - * The following lines are the values that are read during normal - * PCI config access cycles, i.e. not after just having written - * ~0 to a base address register. - */ - -static const u32 lxnb_hdr[] = { /* dev 1 function 0 - devfn = 8 */ - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x281022 , 0x2200005 , 0x6000021 , 0x80f808 , /* AMD Vendor ID */ - 0x0 , 0x0 , 0x0 , 0x0 , /* No virtual registers, hence no BAR for them */ - 0x0 , 0x0 , 0x0 , 0x28100b , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 gxnb_hdr[] = { /* dev 1 function 0 - devfn = 8 */ - 0xfffffffd , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x28100b , 0x2200005 , 0x6000021 , 0x80f808 , /* NSC Vendor ID */ - 0xac1d , 0x0 , 0x0 , 0x0 , /* I/O BAR - base of virtual registers */ - 0x0 , 0x0 , 0x0 , 0x28100b , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 lxfb_hdr[] = { /* dev 1 function 1 - devfn = 9 */ - 0xff800008 , 0xffffc000 , 0xffffc000 , 0xffffc000 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x20811022 , 0x2200003 , 0x3000000 , 0x0 , /* AMD Vendor ID */ - 0xfd000000 , 0xfe000000 , 0xfe004000 , 0xfe008000 , /* FB, GP, VG, DF */ - 0xfe00c000 , 0x0 , 0x0 , 0x30100b , /* VIP */ - 0x0 , 0x0 , 0x0 , 0x10e , /* INTA, IRQ14 for graphics accel */ - 0x0 , 0x0 , 0x0 , 0x0 , - 0x3d0 , 0x3c0 , 0xa0000 , 0x0 , /* VG IO, VG IO, EGA FB, MONO FB */ - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 gxfb_hdr[] = { /* dev 1 function 1 - devfn = 9 */ - 0xff800008 , 0xffffc000 , 0xffffc000 , 0xffffc000 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x30100b , 0x2200003 , 0x3000000 , 0x0 , /* NSC Vendor ID */ - 0xfd000000 , 0xfe000000 , 0xfe004000 , 0xfe008000 , /* FB, GP, VG, DF */ - 0x0 , 0x0 , 0x0 , 0x30100b , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x3d0 , 0x3c0 , 0xa0000 , 0x0 , /* VG IO, VG IO, EGA FB, MONO FB */ - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 aes_hdr[] = { /* dev 1 function 2 - devfn = 0xa */ - 0xffffc000 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x20821022 , 0x2a00006 , 0x10100000 , 0x8 , /* NSC Vendor ID */ - 0xfe010000 , 0x0 , 0x0 , 0x0 , /* AES registers */ - 0x0 , 0x0 , 0x0 , 0x20821022 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , -}; - - -static const u32 isa_hdr[] = { /* dev f function 0 - devfn = 78 */ - 0xfffffff9 , 0xffffff01 , 0xffffffc1 , 0xffffffe1 , - 0xffffff81 , 0xffffffc1 , 0x0 , 0x0 , - - 0x20901022 , 0x2a00049 , 0x6010003 , 0x802000 , - 0x18b1 , 0x1001 , 0x1801 , 0x1881 , /* SMB-8 GPIO-256 MFGPT-64 IRQ-32 */ - 0x1401 , 0x1841 , 0x0 , 0x20901022 , /* PMS-128 ACPI-64 */ - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0xaa5b , /* interrupt steering */ - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 ac97_hdr[] = { /* dev f function 3 - devfn = 7b */ - 0xffffff81 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x20931022 , 0x2a00041 , 0x4010001 , 0x0 , - 0x1481 , 0x0 , 0x0 , 0x0 , /* I/O BAR-128 */ - 0x0 , 0x0 , 0x0 , 0x20931022 , - 0x0 , 0x0 , 0x0 , 0x205 , /* IntB , IRQ5 */ - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 ohci_hdr[] = { /* dev f function 4 - devfn = 7c */ - 0xfffff000 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x20941022 , 0x2300006 , 0xc031002 , 0x0 , - 0xfe01a000 , 0x0 , 0x0 , 0x0 , /* MEMBAR-1000 */ - 0x0 , 0x0 , 0x0 , 0x20941022 , - 0x0 , 0x40 , 0x0 , 0x40a , /* CapPtr INT-D, IRQ A */ - 0xc8020001 , 0x0 , 0x0 , 0x0 , /* Capabilities - 40 is R/O, 44 is mask 8103 (power control) */ - 0x0 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , -}; - -static const u32 ehci_hdr[] = { /* dev f function 4 - devfn = 7d */ - 0xfffff000 , 0x0 , 0x0 , 0x0 , - 0x0 , 0x0 , 0x0 , 0x0 , - - 0x20951022 , 0x2300006 , 0xc032002 , 0x0 , - 0xfe01b000 , 0x0 , 0x0 , 0x0 , /* MEMBAR-1000 */ - 0x0 , 0x0 , 0x0 , 0x20951022 , - 0x0 , 0x40 , 0x0 , 0x40a , /* CapPtr INT-D, IRQ A */ - 0xc8020001 , 0x0 , 0x0 , 0x0 , /* Capabilities - 40 is R/O, 44 is mask 8103 (power control) */ -#if 0 - 0x1 , 0x40080000 , 0x0 , 0x0 , /* EECP - see section 2.1.7 of EHCI spec */ -#endif - 0x01000001 , 0x00000000 , 0x0 , 0x0 , /* EECP - see section 2.1.7 of EHCI spec */ - 0x2020 , 0x0 , 0x0 , 0x0 , /* (EHCI page 8) 60 SBRN (R/O), 61 FLADJ (R/W), PORTWAKECAP */ -}; - -static u32 ff_loc = ~0; -static u32 zero_loc = 0; - -static int bar_probing = 0; /* Set after a write of ~0 to a BAR */ - -#define NB_SLOT 0x1 /* Northbridge - GX chip - Device 1 */ -#define SB_SLOT 0xf /* Southbridge - CS5536 chip - Device F */ -#define SIMULATED(bus, devfn) (((bus) == 0) && ((PCI_SLOT(devfn) == NB_SLOT) || (PCI_SLOT(devfn) == SB_SLOT))) - -static u32 *hdr_addr(const u32 *hdr, int reg) -{ - u32 addr; - - /* - * This is a little bit tricky. The header maps consist of - * 0x20 bytes of size masks, followed by 0x70 bytes of header data. - * In the normal case, when not probing a BAR's size, we want - * to access the header data, so we add 0x20 to the reg offset, - * thus skipping the size mask area. - * In the BAR probing case, we want to access the size mask for - * the BAR, so we subtract 0x10 (the config header offset for - * BAR0), and don't skip the size mask area. - */ - - addr = (u32)hdr + reg + (bar_probing ? -0x10 : 0x20); - - bar_probing = 0; - return (u32 *)addr; -} - -static int pci_olpc_read(unsigned int seg, unsigned int bus, - unsigned int devfn, int reg, int len, u32 *value) -{ - u32 *addr; - - /* Use the hardware mechanism for non-simulated devices */ - if (!SIMULATED(bus, devfn)) - return pci_conf1_read(seg, bus, devfn, reg, len, value); - - /* - * No device has config registers past 0x70, so we save table space - * by not storing entries for the nonexistent registers - */ - if (reg >= 0x70) - addr = &zero_loc; - else { - switch (devfn) { - case 0x8: - addr = hdr_addr(is_lx ? lxnb_hdr : gxnb_hdr, reg); - break; - case 0x9: - addr = hdr_addr(is_lx ? lxfb_hdr : gxfb_hdr, reg); - break; - case 0xa: - addr = is_lx ? hdr_addr(aes_hdr, reg) : &ff_loc; - break; - case 0x78: - addr = hdr_addr(isa_hdr, reg); - break; - case 0x7b: - addr = hdr_addr(ac97_hdr, reg); - break; - case 0x7c: - addr = hdr_addr(ohci_hdr, reg); - break; - case 0x7d: - addr = hdr_addr(ehci_hdr, reg); - break; - default: - addr = &ff_loc; - break; - } - } - switch (len) { - case 1: - *value = *(u8 *) addr; - break; - case 2: - *value = *(u16 *) addr; - break; - case 4: - *value = *addr; - break; - default: - BUG(); - } - - return 0; -} - -static int pci_olpc_write(unsigned int seg, unsigned int bus, - unsigned int devfn, int reg, int len, u32 value) -{ - /* Use the hardware mechanism for non-simulated devices */ - if (!SIMULATED(bus, devfn)) - return pci_conf1_write(seg, bus, devfn, reg, len, value); - - /* XXX we may want to extend this to simulate EHCI power management */ - - /* - * Mostly we just discard writes, but if the write is a size probe - * (i.e. writing ~0 to a BAR), we remember it and arrange to return - * the appropriate size mask on the next read. This is cheating - * to some extent, because it depends on the fact that the next - * access after such a write will always be a read to the same BAR. - */ - - if ((reg >= 0x10) && (reg < 0x2c)) { - /* Write is to a BAR */ - if (value == ~0) - bar_probing = 1; - } else { - /* - * No warning on writes to ROM BAR, CMD, LATENCY_TIMER, - * CACHE_LINE_SIZE, or PM registers. - */ - if ((reg != 0x30) && (reg != 0x04) && (reg != 0x0d) && - (reg != 0x0c) && (reg != 0x44)) - printk(KERN_WARNING "OLPC PCI: Config write to devfn %x reg %x value %x\n", devfn, reg, value); - } - - return 0; -} - -static struct pci_raw_ops pci_olpc_conf = { - .read = pci_olpc_read, - .write = pci_olpc_write, -}; - -void __init pci_olpc_init(void) -{ - if (!machine_is_olpc() || olpc_has_vsa()) - return; - - printk(KERN_INFO "PCI: Using configuration type OLPC\n"); - raw_pci_ops = &pci_olpc_conf; - is_lx = is_geode_lx(); -} |