diff options
Diffstat (limited to 'arch/ppc/boot/simple/qspan_pci.c')
| -rw-r--r-- | arch/ppc/boot/simple/qspan_pci.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/arch/ppc/boot/simple/qspan_pci.c b/arch/ppc/boot/simple/qspan_pci.c deleted file mode 100644 index d2966d032a4..00000000000 --- a/arch/ppc/boot/simple/qspan_pci.c +++ /dev/null @@ -1,269 +0,0 @@ -/* - * LinuxPPC arch/ppc/kernel/qspan_pci.c Dan Malek (dmalek@jlc.net) - * - * QSpan Motorola bus to PCI bridge. The config address register - * is located 0x500 from the base of the bridge control/status registers. - * The data register is located at 0x504. - * This is a two step operation. First, the address register is written, - * then the data register is read/written as required. - * I don't know what to do about interrupts (yet). - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/pci.h> -#include <asm/mpc8xx.h> - -/* - * When reading the configuration space, if something does not respond - * the bus times out and we get a machine check interrupt. So, the - * good ol' exception tables come to mind to trap it and return some - * value. - * - * On an error we just return a -1, since that is what the caller wants - * returned if nothing is present. I copied this from __get_user_asm, - * with the only difference of returning -1 instead of EFAULT. - * There is an associated hack in the machine check trap code. - * - * The QSPAN is also a big endian device, that is it makes the PCI - * look big endian to us. This presents a problem for the Linux PCI - * functions, which assume little endian. For example, we see the - * first 32-bit word like this: - * ------------------------ - * | Device ID | Vendor ID | - * ------------------------ - * If we read/write as a double word, that's OK. But in our world, - * when read as a word, device ID is at location 0, not location 2 as - * the little endian PCI would believe. We have to switch bits in - * the PCI addresses given to us to get the data to/from the correct - * byte lanes. - * - * The QSPAN only supports 4 bits of "slot" in the dev_fn instead of 5. - * It always forces the MS bit to zero. Therefore, dev_fn values - * greater than 128 are returned as "no device found" errors. - * - * The QSPAN can only perform long word (32-bit) configuration cycles. - * The "offset" must have the two LS bits set to zero. Read operations - * require we read the entire word and then sort out what should be - * returned. Write operations other than long word require that we - * read the long word, update the proper word or byte, then write the - * entire long word back. - * - * PCI Bridge hack. We assume (correctly) that bus 0 is the primary - * PCI bus from the QSPAN. If we are called with a bus number other - * than zero, we create a Type 1 configuration access that a downstream - * PCI bridge will interpret. - */ - -#define __get_pci_config(x, addr, op) \ - __asm__ __volatile__( \ - "1: "op" %0,0(%1)\n" \ - " eieio\n" \ - "2:\n" \ - ".section .fixup,\"ax\"\n" \ - "3: li %0,-1\n" \ - " b 2b\n" \ - ".section __ex_table,\"a\"\n" \ - " .align 2\n" \ - " .long 1b,3b\n" \ - ".text" \ - : "=r"(x) : "r"(addr)) - -#define QS_CONFIG_ADDR ((volatile uint *)(PCI_CSR_ADDR + 0x500)) -#define QS_CONFIG_DATA ((volatile uint *)(PCI_CSR_ADDR + 0x504)) - -#define mk_config_addr(bus, dev, offset) \ - (((bus)<<16) | ((dev)<<8) | (offset & 0xfc)) - -#define mk_config_type1(bus, dev, offset) \ - mk_config_addr(bus, dev, offset) | 1; - -/* Initialize the QSpan device registers after power up. -*/ -void -qspan_init(void) -{ - uint *qptr; - - - - qptr = (uint *)PCI_CSR_ADDR; - - /* PCI Configuration/status. Upper bits written to clear - * pending interrupt or status. Lower bits enable QSPAN as - * PCI master, enable memory and I/O cycles, and enable PCI - * parity error checking. - * IMPORTANT: The last two bits of this word enable PCI - * master cycles into the QBus. The QSpan is broken and can't - * meet the timing specs of the PQ bus for this to work. Therefore, - * if you don't have external bus arbitration, you can't use - * this function. - */ -#ifdef EXTERNAL_PQ_ARB - qptr[1] = 0xf9000147; -#else - qptr[1] = 0xf9000144; -#endif - - /* PCI Misc configuration. Set PCI latency timer resolution - * of 8 cycles, set cache size to 4 x 32. - */ - qptr[3] = 0; - - /* Set up PCI Target address mapping. Enable, Posted writes, - * 2Gbyte space (processor memory controller determines actual size). - */ - qptr[64] = 0x8f000080; - - /* Map processor 0x80000000 to PCI 0x00000000. - * Processor address bit 1 determines I/O type access (0x80000000) - * or memory type access (0xc0000000). - */ - qptr[65] = 0x80000000; - - /* Enable error logging and clear any pending error status. - */ - qptr[80] = 0x90000000; - - qptr[512] = 0x000c0003; - - /* Set up Qbus slave image. - */ - qptr[960] = 0x01000000; - qptr[961] = 0x000000d1; - qptr[964] = 0x00000000; - qptr[965] = 0x000000d1; - -} - -/* Functions to support PCI bios-like features to read/write configuration - * space. If the function fails for any reason, a -1 (0xffffffff) value - * must be returned. - */ -#define DEVICE_NOT_FOUND (-1) -#define SUCCESSFUL 0 - -int qs_pci_read_config_byte(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned char *val) -{ - uint temp; - u_char *cp; - - if ((bus > 7) || (dev_fn > 127)) { - *val = 0xff; - return DEVICE_NOT_FOUND; - } - - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - __get_pci_config(temp, QS_CONFIG_DATA, "lwz"); - - offset ^= 0x03; - cp = ((u_char *)&temp) + (offset & 0x03); - *val = *cp; - return SUCCESSFUL; -} - -int qs_pci_read_config_word(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned short *val) -{ - uint temp; - ushort *sp; - - if ((bus > 7) || (dev_fn > 127)) { - *val = 0xffff; - return DEVICE_NOT_FOUND; - } - - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - __get_pci_config(temp, QS_CONFIG_DATA, "lwz"); - offset ^= 0x02; - - sp = ((ushort *)&temp) + ((offset >> 1) & 1); - *val = *sp; - return SUCCESSFUL; -} - -int qs_pci_read_config_dword(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned int *val) -{ - if ((bus > 7) || (dev_fn > 127)) { - *val = 0xffffffff; - return DEVICE_NOT_FOUND; - } - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - __get_pci_config(*val, QS_CONFIG_DATA, "lwz"); - return SUCCESSFUL; -} - -int qs_pci_write_config_byte(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned char val) -{ - uint temp; - u_char *cp; - - if ((bus > 7) || (dev_fn > 127)) - return DEVICE_NOT_FOUND; - - qs_pci_read_config_dword(bus, dev_fn, offset, &temp); - - offset ^= 0x03; - cp = ((u_char *)&temp) + (offset & 0x03); - *cp = val; - - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - *QS_CONFIG_DATA = temp; - - return SUCCESSFUL; -} - -int qs_pci_write_config_word(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned short val) -{ - uint temp; - ushort *sp; - - if ((bus > 7) || (dev_fn > 127)) - return DEVICE_NOT_FOUND; - - qs_pci_read_config_dword(bus, dev_fn, offset, &temp); - - offset ^= 0x02; - sp = ((ushort *)&temp) + ((offset >> 1) & 1); - *sp = val; - - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - *QS_CONFIG_DATA = temp; - - return SUCCESSFUL; -} - -int qs_pci_write_config_dword(unsigned char bus, unsigned char dev_fn, - unsigned char offset, unsigned int val) -{ - if ((bus > 7) || (dev_fn > 127)) - return DEVICE_NOT_FOUND; - - if (bus == 0) - *QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset); - else - *QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset); - *(unsigned int *)QS_CONFIG_DATA = val; - - return SUCCESSFUL; -} - |