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[PATCH v4 09/16] [loongson] pci: clean up pcimap setup

To: linux-kernel@vger.kernel.org, linux-mips@linux-mips.org, ralf@linux-mips.org
Subject: [PATCH v4 09/16] [loongson] pci: clean up pcimap setup
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Thu, 2 Jul 2009 23:23:30 +0800
Cc: Wu Zhangjin <wuzhangjin@gmail.com>, Yan Hua <yanh@lemote.com>, Philippe Vachon <philippe@cowpig.ca>, Zhang Le <r0bertz@gentoo.org>, Zhang Fuxin <zhangfx@lemote.com>, loongson-dev <loongson-dev@googlegroups.com>, Liu Junliang <liujl@lemote.com>, Erwan Lerale <erwan@thiscow.com>, Arnaud Patard <apatard@mandriva.com>
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References: <cover.1246546684.git.wuzhangjin@gmail.com>
Sender: linux-mips-bounce@linux-mips.org
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>
---
 arch/mips/include/asm/mach-lemote/loongson.h |   17 +++++++++++
 arch/mips/include/asm/mach-lemote/pci.h      |    4 +-
 arch/mips/lemote/lm2e/pci.c                  |   41 ++++++++++++++++---------
 3 files changed, 45 insertions(+), 17 deletions(-)

diff --git a/arch/mips/include/asm/mach-lemote/loongson.h 
b/arch/mips/include/asm/mach-lemote/loongson.h
index 76cc2bd..916eace 100644
--- a/arch/mips/include/asm/mach-lemote/loongson.h
+++ b/arch/mips/include/asm/mach-lemote/loongson.h
@@ -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 */
diff --git a/arch/mips/include/asm/mach-lemote/pci.h 
b/arch/mips/include/asm/mach-lemote/pci.h
index 92b2f59..3e6b130 100644
--- a/arch/mips/include/asm/mach-lemote/pci.h
+++ b/arch/mips/include/asm/mach-lemote/pci.h
@@ -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_ */
diff --git a/arch/mips/lemote/lm2e/pci.c b/arch/mips/lemote/lm2e/pci.c
index bee846e..9812c30 100644
--- a/arch/mips/lemote/lm2e/pci.c
+++ b/arch/mips/lemote/lm2e/pci.c
@@ -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;
 
-- 
1.6.2.1


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