| /* |
| * PMC-Sierra MSP board specific pci_ops |
| * |
| * Copyright 2001 MontaVista Software Inc. |
| * Copyright 2005-2007 PMC-Sierra, Inc |
| * |
| * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net |
| * |
| * Much of the code is derived from the original DDB5074 port by |
| * Geert Uytterhoeven <geert@sonycom.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| */ |
| |
| #define PCI_COUNTERS 1 |
| |
| #include <linux/types.h> |
| #include <linux/pci.h> |
| #include <linux/interrupt.h> |
| |
| #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS) |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #endif /* CONFIG_PROC_FS && PCI_COUNTERS */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| |
| #include <asm/byteorder.h> |
| #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL) |
| #include <asm/mipsmtregs.h> |
| #endif |
| |
| #include <msp_prom.h> |
| #include <msp_cic_int.h> |
| #include <msp_pci.h> |
| #include <msp_regs.h> |
| #include <msp_regops.h> |
| |
| #define PCI_ACCESS_READ 0 |
| #define PCI_ACCESS_WRITE 1 |
| |
| #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS) |
| static char proc_init; |
| extern struct proc_dir_entry *proc_bus_pci_dir; |
| unsigned int pci_int_count[32]; |
| |
| static void pci_proc_init(void); |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: read_msp_pci_counts |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Prints the count of how many times each PCI |
| * interrupt has asserted. Can be invoked by the |
| * /proc filesystem. |
| * |
| * INPUTS: page - part of STDOUT calculation |
| * off - part of STDOUT calculation |
| * count - part of STDOUT calculation |
| * data - unused |
| * |
| * OUTPUTS: start - new start location |
| * eof - end of file pointer |
| * |
| * RETURNS: len - STDOUT length |
| * |
| ****************************************************************************/ |
| static int read_msp_pci_counts(char *page, char **start, off_t off, |
| int count, int *eof, void *data) |
| { |
| int i; |
| int len = 0; |
| unsigned int intcount, total = 0; |
| |
| for (i = 0; i < 32; ++i) { |
| intcount = pci_int_count[i]; |
| if (intcount != 0) { |
| len += sprintf(page + len, "[%d] = %u\n", i, intcount); |
| total += intcount; |
| } |
| } |
| |
| len += sprintf(page + len, "total = %u\n", total); |
| if (len <= off+count) |
| *eof = 1; |
| |
| *start = page + off; |
| len -= off; |
| if (len > count) |
| len = count; |
| if (len < 0) |
| len = 0; |
| |
| return len; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: gen_pci_cfg_wr |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Generates a configuration write cycle for debug purposes. |
| * The IDSEL line asserted and location and data written are |
| * immaterial. Just want to be able to prove that a |
| * configuration write can be correctly generated on the |
| * PCI bus. Intent is that this function by invocable from |
| * the /proc filesystem. |
| * |
| * INPUTS: page - part of STDOUT calculation |
| * off - part of STDOUT calculation |
| * count - part of STDOUT calculation |
| * data - unused |
| * |
| * OUTPUTS: start - new start location |
| * eof - end of file pointer |
| * |
| * RETURNS: len - STDOUT length |
| * |
| ****************************************************************************/ |
| static int gen_pci_cfg_wr(char *page, char **start, off_t off, |
| int count, int *eof, void *data) |
| { |
| unsigned char where = 0; /* Write to static Device/Vendor ID */ |
| unsigned char bus_num = 0; /* Bus 0 */ |
| unsigned char dev_fn = 0xF; /* Arbitrary device number */ |
| u32 wr_data = 0xFF00AA00; /* Arbitrary data */ |
| struct msp_pci_regs *preg = (void *)PCI_BASE_REG; |
| int len = 0; |
| unsigned long value; |
| int intr; |
| |
| len += sprintf(page + len, "PMC MSP PCI: Beginning\n"); |
| |
| if (proc_init == 0) { |
| pci_proc_init(); |
| proc_init = ~0; |
| } |
| |
| len += sprintf(page + len, "PMC MSP PCI: Before Cfg Wr\n"); |
| |
| /* |
| * Generate PCI Configuration Write Cycle |
| */ |
| |
| /* Clear cause register bits */ |
| preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F); |
| |
| /* Setup address that is to appear on PCI bus */ |
| preg->config_addr = BPCI_CFGADDR_ENABLE | |
| (bus_num << BPCI_CFGADDR_BUSNUM_SHF) | |
| (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) | |
| (where & 0xFC); |
| |
| value = cpu_to_le32(wr_data); |
| |
| /* Launch the PCI configuration write cycle */ |
| *PCI_CONFIG_SPACE_REG = value; |
| |
| /* |
| * Check if the PCI configuration cycle (rd or wr) succeeded, by |
| * checking the status bits for errors like master or target abort. |
| */ |
| intr = preg->if_status; |
| |
| len += sprintf(page + len, "PMC MSP PCI: After Cfg Wr\n"); |
| |
| /* Handle STDOUT calculations */ |
| if (len <= off+count) |
| *eof = 1; |
| *start = page + off; |
| len -= off; |
| if (len > count) |
| len = count; |
| if (len < 0) |
| len = 0; |
| |
| return len; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: pci_proc_init |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Create entries in the /proc filesystem for debug access. |
| * |
| * INPUTS: none |
| * |
| * OUTPUTS: none |
| * |
| * RETURNS: none |
| * |
| ****************************************************************************/ |
| static void pci_proc_init(void) |
| { |
| create_proc_read_entry("pmc_msp_pci_rd_cnt", 0, NULL, |
| read_msp_pci_counts, NULL); |
| create_proc_read_entry("pmc_msp_pci_cfg_wr", 0, NULL, |
| gen_pci_cfg_wr, NULL); |
| } |
| #endif /* CONFIG_PROC_FS && PCI_COUNTERS */ |
| |
| DEFINE_SPINLOCK(bpci_lock); |
| |
| /***************************************************************************** |
| * |
| * STRUCT: pci_io_resource |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Defines the address range that pciauto() will use to |
| * assign to the I/O BARs of PCI devices. |
| * |
| * Use the start and end addresses of the MSP7120 PCI Host |
| * Controller I/O space, in the form that they appear on the |
| * PCI bus AFTER MSP7120 has performed address translation. |
| * |
| * For I/O accesses, MSP7120 ignores OATRAN and maps I/O |
| * accesses into the bottom 0xFFF region of address space, |
| * so that is the range to put into the pci_io_resource |
| * struct. |
| * |
| * In MSP4200, the start address was 0x04 instead of the |
| * expected 0x00. Will just assume there was a good reason |
| * for this! |
| * |
| * NOTES: Linux, by default, will assign I/O space to the lowest |
| * region of address space. Since MSP7120 and Linux, |
| * by default, have no offset in between how they map, the |
| * io_offset element of pci_controller struct should be set |
| * to zero. |
| * ELEMENTS: |
| * name - String used for a meaningful name. |
| * |
| * start - Start address of MSP7120's I/O space, as MSP7120 presents |
| * the address on the PCI bus. |
| * |
| * end - End address of MSP7120's I/O space, as MSP7120 presents |
| * the address on the PCI bus. |
| * |
| * flags - Attributes indicating the type of resource. In this case, |
| * indicate I/O space. |
| * |
| ****************************************************************************/ |
| static struct resource pci_io_resource = { |
| .name = "pci IO space", |
| .start = 0x04, |
| .end = 0x0FFF, |
| .flags = IORESOURCE_IO /* I/O space */ |
| }; |
| |
| /***************************************************************************** |
| * |
| * STRUCT: pci_mem_resource |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Defines the address range that pciauto() will use to |
| * assign to the memory BARs of PCI devices. |
| * |
| * The .start and .end values are dependent upon how address |
| * translation is performed by the OATRAN regiser. |
| * |
| * The values to use for .start and .end are the values |
| * in the form they appear on the PCI bus AFTER MSP7120 has |
| * performed OATRAN address translation. |
| * |
| * ELEMENTS: |
| * name - String used for a meaningful name. |
| * |
| * start - Start address of MSP7120's memory space, as MSP7120 presents |
| * the address on the PCI bus. |
| * |
| * end - End address of MSP7120's memory space, as MSP7120 presents |
| * the address on the PCI bus. |
| * |
| * flags - Attributes indicating the type of resource. In this case, |
| * indicate memory space. |
| * |
| ****************************************************************************/ |
| static struct resource pci_mem_resource = { |
| .name = "pci memory space", |
| .start = MSP_PCI_SPACE_BASE, |
| .end = MSP_PCI_SPACE_END, |
| .flags = IORESOURCE_MEM /* memory space */ |
| }; |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: bpci_interrupt |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: PCI status interrupt handler. Updates the count of how |
| * many times each status bit has been set, then clears |
| * the status bits. If the appropriate macros are defined, |
| * these counts can be viewed via the /proc filesystem. |
| * |
| * INPUTS: irq - unused |
| * dev_id - unused |
| * pt_regs - unused |
| * |
| * OUTPUTS: none |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * |
| ****************************************************************************/ |
| static int bpci_interrupt(int irq, void *dev_id) |
| { |
| struct msp_pci_regs *preg = (void *)PCI_BASE_REG; |
| unsigned int stat = preg->if_status; |
| |
| #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS) |
| int i; |
| for (i = 0; i < 32; ++i) { |
| if ((1 << i) & stat) |
| ++pci_int_count[i]; |
| } |
| #endif /* PROC_FS && PCI_COUNTERS */ |
| |
| /* printk("PCI ISR: Status=%08X\n", stat); */ |
| |
| /* write to clear all asserted interrupts */ |
| preg->if_status = stat; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_config_access |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Performs a PCI configuration access (rd or wr), then |
| * checks that the access succeeded by querying MSP7120's |
| * PCI status bits. |
| * |
| * INPUTS: |
| * access_type - kind of PCI configuration cycle to perform |
| * (read or write). Legal values are |
| * PCI_ACCESS_WRITE and PCI_ACCESS_READ. |
| * |
| * bus - pointer to the bus number of the device to |
| * be targetted for the configuration cycle. |
| * The only element of the pci_bus structure |
| * used is bus->number. This argument determines |
| * if the configuration access will be Type 0 or |
| * Type 1. Since MSP7120 assumes itself to be the |
| * PCI Host, any non-zero bus->number generates |
| * a Type 1 access. |
| * |
| * devfn - this is an 8-bit field. The lower three bits |
| * specify the function number of the device to |
| * be targetted for the configuration cycle, with |
| * all three-bit combinations being legal. The |
| * upper five bits specify the device number, |
| * with legal values being 10 to 31. |
| * |
| * where - address within the Configuration Header |
| * space to access. |
| * |
| * data - for write accesses, contains the data to |
| * write. |
| * |
| * OUTPUTS: |
| * data - for read accesses, contains the value read. |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * -1 - access failure |
| * |
| ****************************************************************************/ |
| int msp_pcibios_config_access(unsigned char access_type, |
| struct pci_bus *bus, |
| unsigned int devfn, |
| unsigned char where, |
| u32 *data) |
| { |
| struct msp_pci_regs *preg = (void *)PCI_BASE_REG; |
| unsigned char bus_num = bus->number; |
| unsigned char dev_fn = (unsigned char)devfn; |
| unsigned long flags; |
| unsigned long intr; |
| unsigned long value; |
| static char pciirqflag; |
| #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL) |
| unsigned int vpe_status; |
| #endif |
| |
| #if defined(CONFIG_PROC_FS) && defined(PCI_COUNTERS) |
| if (proc_init == 0) { |
| pci_proc_init(); |
| proc_init = ~0; |
| } |
| #endif /* CONFIG_PROC_FS && PCI_COUNTERS */ |
| |
| /* |
| * Just the first time this function invokes, allocate |
| * an interrupt line for PCI host status interrupts. The |
| * allocation assigns an interrupt handler to the interrupt. |
| */ |
| if (pciirqflag == 0) { |
| request_irq(MSP_INT_PCI,/* Hardcoded internal MSP7120 wiring */ |
| bpci_interrupt, |
| SA_SHIRQ | SA_INTERRUPT, |
| "PMC MSP PCI Host", |
| preg); |
| pciirqflag = ~0; |
| } |
| |
| #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL) |
| local_irq_save(flags); |
| vpe_status = dvpe(); |
| #else |
| spin_lock_irqsave(&bpci_lock, flags); |
| #endif |
| |
| /* |
| * Clear PCI cause register bits. |
| * |
| * In Polo, the PCI Host had a dedicated DMA called the |
| * Block Copy (not to be confused with the general purpose Block |
| * Copy Engine block). There appear to have been special interrupts |
| * for this Block Copy, called Block Copy 0 Fault (BC0F) and |
| * Block Copy 1 Fault (BC1F). MSP4200 and MSP7120 don't have this |
| * dedicated Block Copy block, so these two interrupts are now |
| * marked reserved. In case the Block Copy is resurrected in a |
| * future design, maintain the code that treats these two interrupts |
| * specially. |
| * |
| * Write to clear all interrupts in the PCI status register, aside |
| * from BC0F and BC1F. |
| */ |
| preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F); |
| |
| /* Setup address that is to appear on PCI bus */ |
| preg->config_addr = BPCI_CFGADDR_ENABLE | |
| (bus_num << BPCI_CFGADDR_BUSNUM_SHF) | |
| (dev_fn << BPCI_CFGADDR_FUNCTNUM_SHF) | |
| (where & 0xFC); |
| |
| /* IF access is a PCI configuration write */ |
| if (access_type == PCI_ACCESS_WRITE) { |
| value = cpu_to_le32(*data); |
| *PCI_CONFIG_SPACE_REG = value; |
| } else { |
| /* ELSE access is a PCI configuration read */ |
| value = le32_to_cpu(*PCI_CONFIG_SPACE_REG); |
| *data = value; |
| } |
| |
| /* |
| * Check if the PCI configuration cycle (rd or wr) succeeded, by |
| * checking the status bits for errors like master or target abort. |
| */ |
| intr = preg->if_status; |
| |
| /* Clear config access */ |
| preg->config_addr = 0; |
| |
| /* IF error occurred */ |
| if (intr & ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F)) { |
| /* Clear status bits */ |
| preg->if_status = ~(BPCI_IFSTATUS_BC0F | BPCI_IFSTATUS_BC1F); |
| |
| #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL) |
| evpe(vpe_status); |
| local_irq_restore(flags); |
| #else |
| spin_unlock_irqrestore(&bpci_lock, flags); |
| #endif |
| |
| return -1; |
| } |
| |
| #if defined(CONFIG_PMC_MSP7120_GW) || defined(CONFIG_PMC_MSP7120_EVAL) |
| evpe(vpe_status); |
| local_irq_restore(flags); |
| #else |
| spin_unlock_irqrestore(&bpci_lock, flags); |
| #endif |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_read_config_byte |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Read a byte from PCI configuration address spac |
| * Since the hardware can't address 8 bit chunks |
| * directly, read a 32-bit chunk, then mask off extraneous |
| * bits. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the read is destined for. |
| * devfn - device/function combination that the read is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * |
| * OUTPUTS val - read data |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * -1 - read access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_read_config_byte(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u32 *val) |
| { |
| u32 data = 0; |
| |
| /* |
| * If the config access did not complete normally (e.g., underwent |
| * master abort) do the PCI compliant thing, which is to supply an |
| * all ones value. |
| */ |
| if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, |
| where, &data)) { |
| *val = 0xFFFFFFFF; |
| return -1; |
| } |
| |
| *val = (data >> ((where & 3) << 3)) & 0x0ff; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_read_config_word |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Read a word (16 bits) from PCI configuration address space. |
| * Since the hardware can't address 16 bit chunks |
| * directly, read a 32-bit chunk, then mask off extraneous |
| * bits. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the read is destined for. |
| * devfn - device/function combination that the read is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * |
| * OUTPUTS val - read data |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * PCIBIOS_BAD_REGISTER_NUMBER - bad register address |
| * -1 - read access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_read_config_word(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u32 *val) |
| { |
| u32 data = 0; |
| |
| /* if (where & 1) */ /* Commented out non-compliant code. |
| * Should allow word access to configuration |
| * registers, with only exception being when |
| * the word access would wrap around into |
| * the next dword. |
| */ |
| if ((where & 3) == 3) { |
| *val = 0xFFFFFFFF; |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| } |
| |
| /* |
| * If the config access did not complete normally (e.g., underwent |
| * master abort) do the PCI compliant thing, which is to supply an |
| * all ones value. |
| */ |
| if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, |
| where, &data)) { |
| *val = 0xFFFFFFFF; |
| return -1; |
| } |
| |
| *val = (data >> ((where & 3) << 3)) & 0x0ffff; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_read_config_dword |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Read a double word (32 bits) from PCI configuration |
| * address space. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the read is destined for. |
| * devfn - device/function combination that the read is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * |
| * OUTPUTS val - read data |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * PCIBIOS_BAD_REGISTER_NUMBER - bad register address |
| * -1 - read access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_read_config_dword(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u32 *val) |
| { |
| u32 data = 0; |
| |
| /* Address must be dword aligned. */ |
| if (where & 3) { |
| *val = 0xFFFFFFFF; |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| } |
| |
| /* |
| * If the config access did not complete normally (e.g., underwent |
| * master abort) do the PCI compliant thing, which is to supply an |
| * all ones value. |
| */ |
| if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, |
| where, &data)) { |
| *val = 0xFFFFFFFF; |
| return -1; |
| } |
| |
| *val = data; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_write_config_byte |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Write a byte to PCI configuration address space. |
| * Since the hardware can't address 8 bit chunks |
| * directly, a read-modify-write is performed. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the write is destined for. |
| * devfn - device/function combination that the write is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * val - value to write |
| * |
| * OUTPUTS none |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * -1 - write access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_write_config_byte(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u8 val) |
| { |
| u32 data = 0; |
| |
| /* read config space */ |
| if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, |
| where, &data)) |
| return -1; |
| |
| /* modify the byte within the dword */ |
| data = (data & ~(0xff << ((where & 3) << 3))) | |
| (val << ((where & 3) << 3)); |
| |
| /* write back the full dword */ |
| if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, |
| where, &data)) |
| return -1; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_write_config_word |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Write a word (16-bits) to PCI configuration address space. |
| * Since the hardware can't address 16 bit chunks |
| * directly, a read-modify-write is performed. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the write is destined for. |
| * devfn - device/function combination that the write is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * val - value to write |
| * |
| * OUTPUTS none |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * PCIBIOS_BAD_REGISTER_NUMBER - bad register address |
| * -1 - write access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_write_config_word(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u16 val) |
| { |
| u32 data = 0; |
| |
| /* Fixed non-compliance: if (where & 1) */ |
| if ((where & 3) == 3) |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| |
| /* read config space */ |
| if (msp_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, |
| where, &data)) |
| return -1; |
| |
| /* modify the word within the dword */ |
| data = (data & ~(0xffff << ((where & 3) << 3))) | |
| (val << ((where & 3) << 3)); |
| |
| /* write back the full dword */ |
| if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, |
| where, &data)) |
| return -1; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_write_config_dword |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Write a double word (32-bits) to PCI configuration address |
| * space. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the write is destined for. |
| * devfn - device/function combination that the write is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * val - value to write |
| * |
| * OUTPUTS none |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * PCIBIOS_BAD_REGISTER_NUMBER - bad register address |
| * -1 - write access failure |
| * |
| ****************************************************************************/ |
| static int |
| msp_pcibios_write_config_dword(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| u32 val) |
| { |
| /* check that address is dword aligned */ |
| if (where & 3) |
| return PCIBIOS_BAD_REGISTER_NUMBER; |
| |
| /* perform write */ |
| if (msp_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, |
| where, &val)) |
| return -1; |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_read_config |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Interface the PCI configuration read request with |
| * the appropriate function, based on how many bytes |
| * the read request is. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the write is destined for. |
| * devfn - device/function combination that the write is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * size - in units of bytes, should be 1, 2, or 4. |
| * |
| * OUTPUTS val - value read, with any extraneous bytes masked |
| * to zero. |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * -1 - failure |
| * |
| ****************************************************************************/ |
| int |
| msp_pcibios_read_config(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| int size, |
| u32 *val) |
| { |
| if (size == 1) { |
| if (msp_pcibios_read_config_byte(bus, devfn, where, val)) { |
| return -1; |
| } |
| } else if (size == 2) { |
| if (msp_pcibios_read_config_word(bus, devfn, where, val)) { |
| return -1; |
| } |
| } else if (size == 4) { |
| if (msp_pcibios_read_config_dword(bus, devfn, where, val)) { |
| return -1; |
| } |
| } else { |
| *val = 0xFFFFFFFF; |
| return -1; |
| } |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pcibios_write_config |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Interface the PCI configuration write request with |
| * the appropriate function, based on how many bytes |
| * the read request is. |
| * |
| * INPUTS bus - structure containing attributes for the PCI bus |
| * that the write is destined for. |
| * devfn - device/function combination that the write is |
| * destined for. |
| * where - register within the Configuration Header space |
| * to access. |
| * size - in units of bytes, should be 1, 2, or 4. |
| * val - value to write |
| * |
| * OUTPUTS: none |
| * |
| * RETURNS: PCIBIOS_SUCCESSFUL - success |
| * -1 - failure |
| * |
| ****************************************************************************/ |
| int |
| msp_pcibios_write_config(struct pci_bus *bus, |
| unsigned int devfn, |
| int where, |
| int size, |
| u32 val) |
| { |
| if (size == 1) { |
| if (msp_pcibios_write_config_byte(bus, devfn, |
| where, (u8)(0xFF & val))) { |
| return -1; |
| } |
| } else if (size == 2) { |
| if (msp_pcibios_write_config_word(bus, devfn, |
| where, (u16)(0xFFFF & val))) { |
| return -1; |
| } |
| } else if (size == 4) { |
| if (msp_pcibios_write_config_dword(bus, devfn, where, val)) { |
| return -1; |
| } |
| } else { |
| return -1; |
| } |
| |
| return PCIBIOS_SUCCESSFUL; |
| } |
| |
| /***************************************************************************** |
| * |
| * STRUCTURE: msp_pci_ops |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: structure to abstract the hardware specific PCI |
| * configuration accesses. |
| * |
| * ELEMENTS: |
| * read - function for Linux to generate PCI Configuration reads. |
| * write - function for Linux to generate PCI Configuration writes. |
| * |
| ****************************************************************************/ |
| struct pci_ops msp_pci_ops = { |
| .read = msp_pcibios_read_config, |
| .write = msp_pcibios_write_config |
| }; |
| |
| /***************************************************************************** |
| * |
| * STRUCTURE: msp_pci_controller |
| * _________________________________________________________________________ |
| * |
| * Describes the attributes of the MSP7120 PCI Host Controller |
| * |
| * ELEMENTS: |
| * pci_ops - abstracts the hardware specific PCI configuration |
| * accesses. |
| * |
| * mem_resource - address range pciauto() uses to assign to PCI device |
| * memory BARs. |
| * |
| * mem_offset - offset between how MSP7120 outbound PCI memory |
| * transaction addresses appear on the PCI bus and how Linux |
| * wants to configure memory BARs of the PCI devices. |
| * MSP7120 does nothing funky, so just set to zero. |
| * |
| * io_resource - address range pciauto() uses to assign to PCI device |
| * I/O BARs. |
| * |
| * io_offset - offset between how MSP7120 outbound PCI I/O |
| * transaction addresses appear on the PCI bus and how |
| * Linux defaults to configure I/O BARs of the PCI devices. |
| * MSP7120 maps outbound I/O accesses into the bottom |
| * bottom 4K of PCI address space (and ignores OATRAN). |
| * Since the Linux default is to configure I/O BARs to the |
| * bottom 4K, no special offset is needed. Just set to zero. |
| * |
| ****************************************************************************/ |
| static struct pci_controller msp_pci_controller = { |
| .pci_ops = &msp_pci_ops, |
| .mem_resource = &pci_mem_resource, |
| .mem_offset = 0, |
| .io_resource = &pci_io_resource, |
| .io_offset = 0 |
| }; |
| |
| /***************************************************************************** |
| * |
| * FUNCTION: msp_pci_init |
| * _________________________________________________________________________ |
| * |
| * DESCRIPTION: Initialize the PCI Host Controller and register it with |
| * Linux so Linux can seize control of the PCI bus. |
| * |
| ****************************************************************************/ |
| void __init msp_pci_init(void) |
| { |
| struct msp_pci_regs *preg = (void *)PCI_BASE_REG; |
| u32 id; |
| |
| /* Extract Device ID */ |
| id = read_reg32(PCI_JTAG_DEVID_REG, 0xFFFF) >> 12; |
| |
| /* Check if JTAG ID identifies MSP7120 */ |
| if (!MSP_HAS_PCI(id)) { |
| printk(KERN_WARNING "PCI: No PCI; id reads as %x\n", id); |
| goto no_pci; |
| } |
| |
| /* |
| * Enable flushing of the PCI-SDRAM queue upon a read |
| * of the SDRAM's Memory Configuration Register. |
| */ |
| *(unsigned long *)QFLUSH_REG_1 = 3; |
| |
| /* Configure PCI Host Controller. */ |
| preg->if_status = ~0; /* Clear cause register bits */ |
| preg->config_addr = 0; /* Clear config access */ |
| preg->oatran = MSP_PCI_OATRAN; /* PCI outbound addr translation */ |
| preg->if_mask = 0xF8BF87C0; /* Enable all PCI status interrupts */ |
| |
| /* configure so inb(), outb(), and family are functional */ |
| set_io_port_base(MSP_PCI_IOSPACE_BASE); |
| |
| /* Tell Linux the details of the MSP7120 PCI Host Controller */ |
| register_pci_controller(&msp_pci_controller); |
| |
| return; |
| |
| no_pci: |
| /* Disable PCI channel */ |
| printk(KERN_WARNING "PCI: no host PCI bus detected\n"); |
| } |
