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MIPS: Loongson: PCI: Clean up pcimap setup

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Fixup the wrong original comment of pcimap, and make the source code more
understandable. and also, some new extra consideration is added in.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin 2009-07-02 23:23:30 +08:00 committed by Ralf Baechle
parent 5e983ff654
commit f7face03c6
3 changed files with 45 additions and 17 deletions
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17
arch/mips/include/asm/mach-lemote/loongson.h
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@ -33,4 +33,21 @@ extern void __init prom_init_memory(void);
extern void __init prom_init_cmdline(void);
extern void __init prom_init_env(void);
/* PCI Configuration Registers */
#define LOONGSON_PCI_ISR4C BONITO_PCI_REG(0x4c)
/* PCI_Hit*_Sel_* */
#define LOONGSON_PCI_HIT0_SEL_L BONITO(BONITO_REGBASE + 0x50)
#define LOONGSON_PCI_HIT0_SEL_H BONITO(BONITO_REGBASE + 0x54)
#define LOONGSON_PCI_HIT1_SEL_L BONITO(BONITO_REGBASE + 0x58)
#define LOONGSON_PCI_HIT1_SEL_H BONITO(BONITO_REGBASE + 0x5c)
#define LOONGSON_PCI_HIT2_SEL_L BONITO(BONITO_REGBASE + 0x60)
#define LOONGSON_PCI_HIT2_SEL_H BONITO(BONITO_REGBASE + 0x64)
/* PXArb Config & Status */
#define LOONGSON_PXARB_CFG BONITO(BONITO_REGBASE + 0x68)
#define LOONGSON_PXARB_STATUS BONITO(BONITO_REGBASE + 0x6c)
#endif /* __ASM_MACH_LOONGSON_LOONGSON_H */

4
arch/mips/include/asm/mach-lemote/pci.h
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@ -24,8 +24,8 @@
extern struct pci_ops bonito64_pci_ops;
#define LOONGSON2E_PCI_MEM_START 0x14000000UL
#define LOONGSON2E_PCI_MEM_END 0x1fffffffUL
#define LOONGSON2E_PCI_MEM_START BONITO_PCILO1_BASE
#define LOONGSON2E_PCI_MEM_END (BONITO_PCILO1_BASE + 0x04000000 * 2)
#define LOONGSON2E_PCI_IO_START 0x00004000UL
#endif /* !__ASM_MACH_LEMOTE_PCI_H_ */

41
arch/mips/lemote/lm2e/pci.c
View File

@ -34,33 +34,44 @@ static struct pci_controller loongson2e_pci_controller = {
.io_offset = 0x00000000UL,
};
static void __init ict_pcimap(void)
static void __init setup_pcimap(void)
{
/*
* local to PCI mapping: [256M,512M] -> [256M,512M]; differ from PMON
*
* local to PCI mapping for CPU accessing PCI space
* CPU address space [256M,448M] is window for accessing pci space
* we set pcimap_lo[0,1,2] to map it to pci space [256M,448M]
* pcimap: bit18,pcimap_2; bit[17-12],lo2;bit[11-6],lo1;bit[5-0],lo0
* we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
*
* pcimap: PCI_MAP2 PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
* [<2G] [384M,448M] [320M,384M] [0M,64M]
*/
/* 1,00 0110 ,0001 01,00 0000 */
BONITO_PCIMAP = 0x46140;
/* 1, 00 0010, 0000,01, 00 0000 */
/* BONITO_PCIMAP = 0x42040; */
BONITO_PCIMAP = BONITO_PCIMAP_PCIMAP_2 |
BONITO_PCIMAP_WIN(2, BONITO_PCILO2_BASE) |
BONITO_PCIMAP_WIN(1, BONITO_PCILO1_BASE) |
BONITO_PCIMAP_WIN(0, 0);
/*
* PCI to local mapping: [2G,2G+256M] -> [0,256M]
* PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
*/
BONITO_PCIBASE0 = 0x80000000;
BONITO_PCIBASE1 = 0x00800000;
BONITO_PCIBASE2 = 0x90000000;
BONITO_PCIBASE0 = 0x80000000ul; /* base: 2G -> mmap: 0M */
/* size: 256M, burst transmission, pre-fetch enable, 64bit */
LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
/* avoid deadlock of PCI reading/writing lock operation */
LOONGSON_PCI_ISR4C = 0xd2000001ul;
/* can not change gnt to break pci transfer when device's gnt not
deassert for some broken device */
LOONGSON_PXARB_CFG = 0x00fe0105ul;
}
static int __init pcibios_init(void)
{
ict_pcimap();
setup_pcimap();
loongson2e_pci_controller.io_map_base = mips_io_port_base;