/*
* Motorola MCG Harrier northbridge/memory controller support
*
* Author: Dale Farnsworth
* dale.farnsworth@mvista.com
*
* 2001 (c) MontaVista, Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/harrier_defs.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pci.h>
#include <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/harrier.h>
/* define defaults for inbound windows */
#define HARRIER_ITAT_DEFAULT (HARRIER_ITAT_ENA | \
HARRIER_ITAT_MEM | \
HARRIER_ITAT_WPE | \
HARRIER_ITAT_GBL)
#define HARRIER_MPAT_DEFAULT (HARRIER_ITAT_ENA | \
HARRIER_ITAT_MEM | \
HARRIER_ITAT_WPE | \
HARRIER_ITAT_GBL)
/*
* Initialize the inbound window size on a non-monarch harrier.
*/
void __init harrier_setup_nonmonarch(uint ppc_reg_base, uint in0_size)
{
u16 temps;
u32 temp;
if (in0_size > HARRIER_ITSZ_2GB) {
printk
("harrier_setup_nonmonarch: Invalid window size code %d\n",
in0_size);
return;
}
/* Clear the PCI memory enable bit. If we don't, then when the
* inbound windows are enabled below, the corresponding BARs will be
* "live" and start answering to PCI memory reads from their default
* addresses (0x0), which overlap with system RAM.
*/
temps = in_le16((u16 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(PCI_COMMAND)));
temps &= ~(PCI_COMMAND_MEMORY);
out_le16((u16 *) (ppc_reg_base + HARRIER_XCSR_CONFIG(PCI_COMMAND)),
temps);
/* Setup a non-prefetchable inbound window */
out_le32((u32 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(HARRIER_ITSZ0_OFF)), in0_size);
temp = in_le32((u32 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(HARRIER_ITAT0_OFF)));
temp &= ~HARRIER_ITAT_PRE;
temp |= HARRIER_ITAT_DEFAULT;
out_le32((u32 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(HARRIER_ITAT0_OFF)), temp);
/* Enable the message passing block */
temp = in_le32((u32 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(HARRIER_MPAT_OFF)));
temp |= HARRIER_MPAT_DEFAULT;
out_le32((u32 *) (ppc_reg_base +
HARRIER_XCSR_CONFIG(HARRIER_MPAT_OFF)), temp);
}
void __init harrier_release_eready(uint ppc_reg_base)
{
ulong temp;
/*
* Set EREADY to allow the line to be pulled up after everyone is
* ready.
*/
temp = in_be32((uint *) (ppc_reg_base + HARRIER_MISC_CSR_OFF));
temp |= HARRIER_EREADY;
out_be32((uint *) (ppc_reg_base + HARRIER_MISC_CSR_OFF), temp);
}
void __init harrier_wait_eready(uint ppc_reg_base)
{
ulong temp;
/*
* Poll the ERDYS line until it goes high to indicate that all
* non-monarch PrPMCs are ready for bus enumeration (or that there are
* no PrPMCs present).
*/
/* FIXME: Add a timeout of some kind to prevent endless waits. */
do {
temp = in_be32((uint *) (ppc_reg_base + HARRIER_MISC_CSR_OFF));
} while (!(temp & HARRIER_ERDYS));
}
/*
* Initialize the Motorola MCG Harrier host bridge.
*
* This means setting up the PPC bus to PCI memory and I/O space mappings,
* setting the PCI memory space address of the MPIC (mapped straight
* through), and ioremap'ing the mpic registers.
* 'OpenPIC_Addr' will be set correctly by this routine.
* This routine will not change the PCI_CONFIG_ADDR or PCI_CONFIG_DATA
* addresses and assumes that the mapping of PCI memory space back to system
* memory is set up correctly by PPCBug.
*/
int __init
harrier_init(struct pci_controller *hose,
uint ppc_reg_base,
ulong processor_pci_mem_start,
ulong processor_pci_mem_end,
ulong processor_pci_io_start,
ulong processor_pci_io_end, ulong processor_mpic_base)
{
uint addr, offset;
/*
* Some sanity checks...
*/
if (((processor_pci_mem_start & 0xffff0000) != processor_pci_mem_start)
|| ((processor_pci_io_start & 0xffff0000) !=
processor_pci_io_start)) {
printk("harrier_init: %s\n",
"PPC to PCI mappings must start on 64 KB boundaries");
return -1;
}
if (((processor_pci_mem_end & 0x0000ffff) != 0x0000ffff) ||
((processor_pci_io_end & 0x0000ffff) != 0x0000ffff)) {
printk("harrier_init: PPC to PCI mappings %s\n",
"must end just before a 64 KB boundaries");
return -1;
}
if (((processor_pci_mem_end - processor_pci_mem_start) !=
(hose->mem_space.end - hose->mem_space.start)) ||
((processor_pci_io_end - processor_pci_io_start) !=
(hose->io_space.end - hose->io_space.start))) {
printk("harrier_init: %s\n",
"PPC and PCI memory or I/O space sizes don't match");
return -1;
}
if ((processor_mpic_base & 0xfffc0000) != processor_mpic_base) {
printk("harrier_init: %s\n",
"MPIC address must start on 256 KB boundary");
return -1;
}
if ((pci_dram_offset & 0xffff0000) != pci_dram_offset) {
printk("harrier_init: %s\n",
"pci_dram_offset must be multiple of 64 KB");
return -1;
}
/*
* Program the OTAD/OTOF registers to set up the PCI Mem & I/O
* space mappings. These are the mappings going from the processor to
* the PCI bus.
*
* Note: Don't need to 'AND' start/end addresses with 0xffff0000
* because sanity check above ensures that they are properly
* aligned.
*/
/* Set up PPC->PCI Mem mapping */
addr = processor_pci_mem_start | (processor_pci_mem_end >> 16);
#ifdef CONFIG_HARRIER_STORE_GATHERING
offset = (hose->mem_space.start - processor_pci_mem_start) | 0x9a;
#else
offset = (hose->mem_space.start - processor_pci_mem_start) | 0x92;
#endif
out_be32((uint *) (ppc_reg_base + HARRIER_OTAD0_OFF), addr);
out_be32((uint *) (ppc_reg_base + HARRIER_OTOF0_OFF), offset);
/* Set up PPC->PCI I/O mapping -- Contiguous I/O space */
addr = processor_pci_io_start | (processor_pci_io_end >> 16);
offset = (hose->io_space.start - processor_pci_io_start) | 0x80;
out_be32((uint *) (ppc_reg_base + HARRIER_OTAD1_OFF), addr);
out_be32((uint *) (ppc_reg_base + HARRIER_OTOF1_OFF), offset);
/* Enable MPIC */
OpenPIC_Addr = (void *)processor_mpic_base;
addr = (processor_mpic_base >> 16) | 1;
out_be16((ushort *) (ppc_reg_base + HARRIER_MBAR_OFF), addr);
out_8((u_char *) (ppc_reg_base + HARRIER_MPIC_CSR_OFF),
HARRIER_MPIC_OPI_ENABLE);
return 0;
}
/*
* Find the amount of RAM present.
* This assumes that PPCBug has initialized the memory controller (SMC)
* on the Harrier correctly (i.e., it does no sanity checking).
* It also assumes that the memory base registers are set to configure the
* memory as contiguous starting with "RAM A BASE", "RAM B BASE", etc.
* however, RAM base registers can be skipped (e.g. A, B, C are set,
* D is skipped but E is set is okay).
*/
#define MB (1024*1024UL)
static uint harrier_size_table[] __initdata = {
0 * MB, /* 0 ==> 0 MB */
32 * MB, /* 1 ==> 32 MB */
64 * MB, /* 2 ==> 64 MB */
64 * MB, /* 3 ==> 64 MB */
128 * MB, /* 4 ==> 128 MB */
128 * MB, /* 5 ==> 128 MB */
128 * MB, /* 6 ==> 128 MB */
256 * MB, /* 7 ==> 256 MB */
256 * MB, /* 8 ==> 256 MB */
256 * MB, /* 9 ==> 256 MB */
512 * MB, /* a ==> 512 MB */
512 * MB, /* b ==> 512 MB */
512 * MB, /* c ==> 512 MB */
1024 * MB, /* d ==> 1024 MB */
1024 * MB, /* e ==> 1024 MB */
2048 * MB, /* f ==> 2048 MB */
};
/*
* *** WARNING: You MUST have a BAT set up to map in the XCSR regs ***
*
* Read the memory controller's registers to determine the amount of system
* memory. Assumes that the memory controller registers are already mapped
* into virtual memory--too early to use ioremap().
*/
unsigned long __init harrier_get_mem_size(uint xcsr_base)
{
ulong last_addr;
int i;
uint vend_dev_id;
uint *size_table;
uint val;
uint *csrp;
uint size;
int size_table_entries;
vend_dev_id = in_be32((uint *) xcsr_base + PCI_VENDOR_ID);
if (((vend_dev_id & 0xffff0000) >> 16) != PCI_VENDOR_ID_MOTOROLA) {
printk("harrier_get_mem_size: %s (0x%x)\n",
"Not a Motorola Memory Controller", vend_dev_id);
return 0;
}
vend_dev_id &= 0x0000ffff;
if (vend_dev_id == PCI_DEVICE_ID_MOTOROLA_HARRIER) {
size_table = harrier_size_table;
size_table_entries = sizeof(harrier_size_table) /
sizeof(harrier_size_table[0]);
} else {
printk("harrier_get_mem_size: %s (0x%x)\n",
"Not a Harrier", vend_dev_id);
return 0;
}
last_addr = 0;
csrp = (uint *) (xcsr_base + HARRIER_SDBA_OFF);
for (i = 0; i < 8; i++) {
val = in_be32(csrp++);
if (val & 0x100) { /* If enabled */
size = val >> HARRIER_SDB_SIZE_SHIFT;
size &= HARRIER_SDB_SIZE_MASK;
if (size >= size_table_entries) {
break; /* Register not set correctly */
}
size = size_table[size];
val &= ~(size - 1);
val += size;
if (val > last_addr) {
last_addr = val;
}
}
}
return last_addr;
}
