Common Freescale code for PCI initialization now exists, so migrate X-ES boards to use it.
Signed-off-by: Peter Tyser ptyser@xes-inc.com CC: Kumar Gala galak@kernel.crashing.org --- board/xes/common/fsl_8xxx_pci.c | 367 +++++--------------------------------- include/configs/XPEDITE5170.h | 12 +- include/configs/XPEDITE5200.h | 6 +- include/configs/XPEDITE5370.h | 12 +- include/configs/XPEDITE5500.h | 6 +- 5 files changed, 67 insertions(+), 336 deletions(-)
diff --git a/board/xes/common/fsl_8xxx_pci.c b/board/xes/common/fsl_8xxx_pci.c index fc6616d..f425cee 100644 --- a/board/xes/common/fsl_8xxx_pci.c +++ b/board/xes/common/fsl_8xxx_pci.c @@ -25,10 +25,10 @@ #include <pci.h> #include <asm/fsl_pci.h> #include <asm/io.h> +#include <linux/compiler.h> #include <libfdt.h> #include <fdt_support.h>
-int first_free_busno = 0;
#ifdef CONFIG_PCI1 static struct pci_controller pci1_hose; @@ -43,150 +43,6 @@ static struct pci_controller pcie2_hose; static struct pci_controller pcie3_hose; #endif
-#if defined CONFIG_P2020 -/* Correlate host/agent POR bits to usable info. Table 4-14 */ -struct host_agent_cfg_t { - uchar pcie_root[3]; - uchar rio_host[2]; -} host_agent_cfg[8] = { - {{0, 0, 0}, {0, 0}}, - {{0, 1, 1}, {1, 1}}, - {{1, 0, 1}, {0, 0}}, - {{1, 1, 0}, {1, 1}}, - {{0, 0, 1}, {0, 0}}, - {{0, 1, 0}, {1, 1}}, - {{1, 0, 0}, {0, 0}}, - {{1, 1, 1}, {1, 1}} -}; - -/* Correlate port width POR bits to usable info. Table 4-15 */ -struct io_port_cfg_t { - uchar pcie_width[3]; - uchar rio_width[2]; - uchar etsec_width[2]; -} io_port_cfg[16] = { - {{1, 0, 0}, {0, 0}, {0, 0}}, - {{0, 0, 0}, {0, 0}, {0, 0}}, - {{1, 1, 2}, {0, 0}, {0, 0}}, - {{0, 0, 0}, {0, 0}, {0, 0}}, - {{2, 0, 2}, {0, 0}, {0, 0}}, - {{0, 0, 0}, {0, 0}, {0, 0}}, - {{4, 0, 0}, {0, 0}, {0, 0}}, - {{0, 0, 0}, {1, 1}, {0, 0}}, - {{0, 0, 0}, {0, 4}, {0, 0}}, - {{0, 0, 0}, {0, 4}, {0, 0}}, - {{0, 0, 0}, {0, 4}, {0, 0}}, - {{0, 0, 0}, {1, 1}, {1, 1}}, - {{0, 0, 0}, {1, 1}, {1, 1}}, - {{1, 0, 0}, {1, 0}, {1, 1}}, - {{1, 1, 0}, {0, 0}, {1, 1}}, - {{2, 0, 0}, {0, 0}, {1, 1}}, -}; -#elif CONFIG_MPC8572 -/* Correlate host/agent POR bits to usable info. Table 4-14 */ -struct host_agent_cfg_t { - uchar pcie_root[3]; - uchar rio_host; -} host_agent_cfg[8] = { - {{0, 0, 0}, 0}, - {{0, 1, 1}, 1}, - {{1, 0, 1}, 0}, - {{1, 1, 0}, 1}, - {{0, 0, 1}, 0}, - {{0, 1, 0}, 1}, - {{1, 0, 0}, 0}, - {{1, 1, 1}, 1} -}; - -/* Correlate port width POR bits to usable info. Table 4-15 */ -struct io_port_cfg_t { - uchar pcie_width[3]; - uchar rio_width; -} io_port_cfg[16] = { - {{0, 0, 0}, 0}, - {{0, 0, 0}, 0}, - {{4, 0, 0}, 0}, - {{4, 4, 0}, 0}, - {{0, 0, 0}, 0}, - {{0, 0, 0}, 0}, - {{0, 0, 0}, 4}, - {{4, 2, 2}, 0}, - {{0, 0, 0}, 0}, - {{0, 0, 0}, 0}, - {{0, 0, 0}, 0}, - {{4, 0, 0}, 4}, - {{4, 0, 0}, 4}, - {{0, 0, 0}, 4}, - {{0, 0, 0}, 4}, - {{8, 0, 0}, 0}, -}; -#elif defined CONFIG_MPC8548 -/* Correlate host/agent POR bits to usable info. Table 4-12 */ -struct host_agent_cfg_t { - uchar pci_host[2]; - uchar pcie_root[1]; - uchar rio_host; -} host_agent_cfg[8] = { - {{1, 1}, {0}, 0}, - {{1, 1}, {1}, 0}, - {{1, 1}, {0}, 1}, - {{0, 0}, {0}, 0}, /* reserved */ - {{0, 1}, {1}, 0}, - {{1, 1}, {1}, 0}, - {{0, 1}, {1}, 1}, - {{1, 1}, {1}, 1} -}; - -/* Correlate port width POR bits to usable info. Table 4-13 */ -struct io_port_cfg_t { - uchar pcie_width[1]; - uchar rio_width; -} io_port_cfg[8] = { - {{0}, 0}, - {{0}, 0}, - {{0}, 0}, - {{4}, 4}, - {{4}, 4}, - {{0}, 4}, - {{0}, 4}, - {{8}, 0}, -}; -#elif defined CONFIG_MPC86xx -/* Correlate host/agent POR bits to usable info. Table 4-17 */ -struct host_agent_cfg_t { - uchar pcie_root[2]; - uchar rio_host; -} host_agent_cfg[8] = { - {{0, 0}, 0}, - {{1, 0}, 1}, - {{0, 1}, 0}, - {{1, 1}, 1} -}; - -/* Correlate port width POR bits to usable info. Table 4-16 */ -struct io_port_cfg_t { - uchar pcie_width[2]; - uchar rio_width; -} io_port_cfg[16] = { - {{0, 0}, 0}, - {{0, 0}, 0}, - {{8, 0}, 0}, - {{8, 8}, 0}, - {{0, 0}, 0}, - {{8, 0}, 4}, - {{8, 0}, 4}, - {{8, 0}, 4}, - {{0, 0}, 0}, - {{0, 0}, 4}, - {{0, 0}, 4}, - {{0, 0}, 4}, - {{0, 0}, 0}, - {{0, 0}, 0}, - {{0, 8}, 0}, - {{8, 8}, 0}, -}; -#endif - /* * 85xx and 86xx share naming conventions, but different layout. * Correlate names to CPU-specific values to share common @@ -212,22 +68,22 @@ struct io_port_cfg_t {
void pci_init_board(void) { - struct pci_controller *hose; - volatile ccsr_fsl_pci_t *pci; - int width; - int host; + struct fsl_pci_info pci_info[3]; + int first_free_busno = 0; + int num = 0; + int pcie_ep; + __maybe_unused int pcie_configured; + #if defined(CONFIG_MPC85xx) volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); #elif defined(CONFIG_MPC86xx) immap_t *immap = (immap_t *)CONFIG_SYS_IMMR; volatile ccsr_gur_t *gur = &immap->im_gur; #endif - uint devdisr = in_be32(&gur->devdisr); - uint io_sel = (in_be32(&gur->pordevsr) & MPC8xxx_PORDEVSR_IO_SEL) >> + u32 devdisr = in_be32(&gur->devdisr); + u32 pordevsr = in_be32(&gur->pordevsr); + __maybe_unused uint io_sel = (pordevsr & MPC8xxx_PORDEVSR_IO_SEL) >> MPC8xxx_PORDEVSR_IO_SEL_SHIFT; - uint host_agent = (in_be32(&gur->porbmsr) & MPC8xxx_PORBMSR_HA) >> - MPC8xxx_PORBMSR_HA_SHIFT; - struct pci_region *r;
#ifdef CONFIG_PCI1 uint pci_spd_norm = in_be32(&gur->pordevsr) & MPC85xx_PORDEVSR_PCI1_SPD; @@ -236,49 +92,19 @@ void pci_init_board(void) uint pcix = in_be32(&gur->pordevsr) & MPC85xx_PORDEVSR_PCI1; uint freq = CONFIG_SYS_CLK_FREQ / 1000 / 1000;
- width = 0; /* Silence compiler warning... */ - io_sel &= 0xf; /* Silence compiler warning... */ - pci = (ccsr_fsl_pci_t *) CONFIG_SYS_PCI1_ADDR; - hose = &pci1_hose; - host = host_agent_cfg[host_agent].pci_host[0]; - r = hose->regions; - if (!(devdisr & MPC85xx_DEVDISR_PCI1)) { + SET_STD_PCI_INFO(pci_info[num], 1); + pcie_ep = fsl_setup_hose(&pci1_hose, pci_info[num].regs); printf("\n PCI1: %d bit %s, %s %d MHz, %s, %s\n", pci_32 ? 32 : 64, pcix ? "PCIX" : "PCI", pci_spd_norm ? ">=" : "<=", pcix ? freq * 2 : freq, - host ? "host" : "agent", + pcie_ep ? "agent" : "host", pci_arb ? "arbiter" : "external-arbiter");
- /* outbound memory */ - pci_set_region(r++, - CONFIG_SYS_PCI1_MEM_BASE, - CONFIG_SYS_PCI1_MEM_PHYS, - CONFIG_SYS_PCI1_MEM_SIZE, - PCI_REGION_MEM); - - /* outbound io */ - pci_set_region(r++, - CONFIG_SYS_PCI1_IO_BASE, - CONFIG_SYS_PCI1_IO_PHYS, - CONFIG_SYS_PCI1_IO_SIZE, - PCI_REGION_IO); - - hose->region_count = r - hose->regions; - - hose->first_busno = first_free_busno; - - fsl_pci_init(hose, (u32)&pci->cfg_addr, (u32)&pci->cfg_data); - - /* Unlock inbound PCI configuration cycles */ - if (!host) - fsl_pci_config_unlock(hose); - - first_free_busno = hose->last_busno + 1; - printf(" PCI1 on bus %02x - %02x\n", - hose->first_busno, hose->last_busno); + first_free_busno = fsl_pci_init_port(&pci_info[num++], + &pci1_hose, first_free_busno); } else { printf(" PCI1: disabled\n"); } @@ -286,148 +112,53 @@ void pci_init_board(void) /* PCI1 not present on MPC8572 */ setbits_be32(&gur->devdisr, MPC85xx_DEVDISR_PCI1); #endif -#ifdef CONFIG_PCIE1 - pci = (ccsr_fsl_pci_t *) CONFIG_SYS_PCIE1_ADDR; - hose = &pcie1_hose; - host = host_agent_cfg[host_agent].pcie_root[0]; - width = io_port_cfg[io_sel].pcie_width[0]; - r = hose->regions; - - if (width && !(devdisr & MPC8xxx_DEVDISR_PCIE1)) { - printf("\n PCIE1 connected as %s (x%d)", - host ? "Root Complex" : "Endpoint", width); - if (in_be32(&pci->pme_msg_det)) { - out_be32(&pci->pme_msg_det, 0xffffffff); - debug(" with errors. Clearing. Now 0x%08x", - in_be32(&pci->pme_msg_det)); - } - printf("\n"); - - /* outbound memory */ - pci_set_region(r++, - CONFIG_SYS_PCIE1_MEM_BASE, - CONFIG_SYS_PCIE1_MEM_PHYS, - CONFIG_SYS_PCIE1_MEM_SIZE, - PCI_REGION_MEM); - - /* outbound io */ - pci_set_region(r++, - CONFIG_SYS_PCIE1_IO_BASE, - CONFIG_SYS_PCIE1_IO_PHYS, - CONFIG_SYS_PCIE1_IO_SIZE, - PCI_REGION_IO); - - hose->region_count = r - hose->regions; - - hose->first_busno = first_free_busno; - - fsl_pci_init(hose, (u32)&pci->cfg_addr, (u32)&pci->cfg_data);
- /* Unlock inbound PCI configuration cycles */ - if (!host) - fsl_pci_config_unlock(hose); - - first_free_busno = hose->last_busno + 1; - printf(" PCIE1 on bus %02x - %02x\n", - hose->first_busno, hose->last_busno); +#ifdef CONFIG_PCIE1 + pcie_configured = is_fsl_pci_cfg(LAW_TRGT_IF_PCIE_1, io_sel); + + if (pcie_configured && !(devdisr & MPC8xxx_DEVDISR_PCIE1)) { + SET_STD_PCIE_INFO(pci_info[num], 1); + pcie_ep = fsl_setup_hose(&pcie1_hose, pci_info[num].regs); + printf(" PCIE1 connected as %s\n", + pcie_ep ? "Endpoint" : "Root Complex"); + first_free_busno = fsl_pci_init_port(&pci_info[num++], + &pcie1_hose, first_free_busno); + } else { + printf(" PCIE1: disabled\n"); } #else setbits_be32(&gur->devdisr, MPC8xxx_DEVDISR_PCIE1); #endif /* CONFIG_PCIE1 */
#ifdef CONFIG_PCIE2 - pci = (ccsr_fsl_pci_t *) CONFIG_SYS_PCIE2_ADDR; - hose = &pcie2_hose; - host = host_agent_cfg[host_agent].pcie_root[1]; - width = io_port_cfg[io_sel].pcie_width[1]; - r = hose->regions; - - if (width && !(devdisr & MPC8xxx_DEVDISR_PCIE2)) { - printf("\n PCIE2 connected as %s (x%d)", - host ? "Root Complex" : "Endpoint", width); - if (in_be32(&pci->pme_msg_det)) { - out_be32(&pci->pme_msg_det, 0xffffffff); - debug(" with errors. Clearing. Now 0x%08x", - in_be32(&pci->pme_msg_det)); - } - printf("\n"); - - /* outbound memory */ - pci_set_region(r++, - CONFIG_SYS_PCIE2_MEM_BASE, - CONFIG_SYS_PCIE2_MEM_PHYS, - CONFIG_SYS_PCIE2_MEM_SIZE, - PCI_REGION_MEM); - - /* outbound io */ - pci_set_region(r++, - CONFIG_SYS_PCIE2_IO_BASE, - CONFIG_SYS_PCIE2_IO_PHYS, - CONFIG_SYS_PCIE2_IO_SIZE, - PCI_REGION_IO); - - hose->region_count = r - hose->regions; - - hose->first_busno = first_free_busno; - - fsl_pci_init(hose, (u32)&pci->cfg_addr, (u32)&pci->cfg_data); - - /* Unlock inbound PCI configuration cycles */ - if (!host) - fsl_pci_config_unlock(hose); - - first_free_busno = hose->last_busno + 1; - printf(" PCIE2 on bus %02x - %02x\n", - hose->first_busno, hose->last_busno); + pcie_configured = is_fsl_pci_cfg(LAW_TRGT_IF_PCIE_2, io_sel); + + if (pcie_configured && !(devdisr & MPC8xxx_DEVDISR_PCIE2)) { + SET_STD_PCIE_INFO(pci_info[num], 2); + pcie_ep = fsl_setup_hose(&pcie2_hose, pci_info[num].regs); + printf(" PCIE2 connected as %s\n", + pcie_ep ? "Endpoint" : "Root Complex"); + first_free_busno = fsl_pci_init_port(&pci_info[num++], + &pcie2_hose, first_free_busno); + } else { + printf(" PCIE2: disabled\n"); } #else setbits_be32(&gur->devdisr, MPC8xxx_DEVDISR_PCIE2); #endif /* CONFIG_PCIE2 */
#ifdef CONFIG_PCIE3 - pci = (ccsr_fsl_pci_t *) CONFIG_SYS_PCIE3_ADDR; - hose = &pcie3_hose; - host = host_agent_cfg[host_agent].pcie_root[2]; - width = io_port_cfg[io_sel].pcie_width[2]; - r = hose->regions; - - if (width && !(devdisr & MPC8xxx_DEVDISR_PCIE3)) { - printf("\n PCIE3 connected as %s (x%d)", - host ? "Root Complex" : "Endpoint", width); - if (in_be32(&pci->pme_msg_det)) { - out_be32(&pci->pme_msg_det, 0xffffffff); - debug(" with errors. Clearing. Now 0x%08x", - in_be32(&pci->pme_msg_det)); - } - printf("\n"); - - /* outbound memory */ - pci_set_region(r++, - CONFIG_SYS_PCIE3_MEM_BASE, - CONFIG_SYS_PCIE3_MEM_PHYS, - CONFIG_SYS_PCIE3_MEM_SIZE, - PCI_REGION_MEM); - - /* outbound io */ - pci_set_region(r++, - CONFIG_SYS_PCIE3_IO_BASE, - CONFIG_SYS_PCIE3_IO_PHYS, - CONFIG_SYS_PCIE3_IO_SIZE, - PCI_REGION_IO); - - hose->region_count = r - hose->regions; - - hose->first_busno = first_free_busno; - - fsl_pci_init(hose, (u32)&pci->cfg_addr, (u32)&pci->cfg_data); - - /* Unlock inbound PCI configuration cycles */ - if (!host) - fsl_pci_config_unlock(hose); - - first_free_busno = hose->last_busno + 1; - printf(" PCIE3 on bus %02x - %02x\n", - hose->first_busno, hose->last_busno); + pcie_configured = is_fsl_pci_cfg(LAW_TRGT_IF_PCIE_3, io_sel); + + if (pcie_configured && !(devdisr & MPC8xxx_DEVDISR_PCIE3)) { + SET_STD_PCIE_INFO(pci_info[num], 3); + pcie_ep = fsl_setup_hose(&pcie3_hose, pci_info[num].regs); + printf(" PCIE3 connected as %s\n", + pcie_ep ? "Endpoint" : "Root Complex"); + first_free_busno = fsl_pci_init_port(&pci_info[num++], + &pcie3_hose, first_free_busno); + } else { + printf(" PCIE3: disabled\n"); } #else setbits_be32(&gur->devdisr, MPC8xxx_DEVDISR_PCIE3); diff --git a/include/configs/XPEDITE5170.h b/include/configs/XPEDITE5170.h index 8770a8d..634b662 100644 --- a/include/configs/XPEDITE5170.h +++ b/include/configs/XPEDITE5170.h @@ -321,18 +321,18 @@ extern unsigned long get_board_sys_clk(unsigned long dummy); * Memory space is mapped 1-1, but I/O space must start from 0. */ /* PCIE1 - PEX8518 */ -#define CONFIG_SYS_PCIE1_MEM_BASE 0x80000000 -#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BASE +#define CONFIG_SYS_PCIE1_MEM_BUS 0x80000000 +#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BUS #define CONFIG_SYS_PCIE1_MEM_SIZE 0x40000000 /* 1G */ -#define CONFIG_SYS_PCIE1_IO_BASE 0x00000000 +#define CONFIG_SYS_PCIE1_IO_BUS 0x00000000 #define CONFIG_SYS_PCIE1_IO_PHYS 0xe8000000 #define CONFIG_SYS_PCIE1_IO_SIZE 0x00800000 /* 8M */
/* PCIE2 - VPX P1 */ -#define CONFIG_SYS_PCIE2_MEM_BASE 0xc0000000 -#define CONFIG_SYS_PCIE2_MEM_PHYS CONFIG_SYS_PCIE2_MEM_BASE +#define CONFIG_SYS_PCIE2_MEM_BUS 0xc0000000 +#define CONFIG_SYS_PCIE2_MEM_PHYS CONFIG_SYS_PCIE2_MEM_BUS #define CONFIG_SYS_PCIE2_MEM_SIZE 0x10000000 /* 256M */ -#define CONFIG_SYS_PCIE2_IO_BASE 0x00000000 +#define CONFIG_SYS_PCIE2_IO_BUS 0x00000000 #define CONFIG_SYS_PCIE2_IO_PHYS 0xe8800000 #define CONFIG_SYS_PCIE2_IO_SIZE 0x00800000 /* 8M */
diff --git a/include/configs/XPEDITE5200.h b/include/configs/XPEDITE5200.h index 1fbe4fb..a23e7c5 100644 --- a/include/configs/XPEDITE5200.h +++ b/include/configs/XPEDITE5200.h @@ -264,10 +264,10 @@ * General PCI * Memory space is mapped 1-1, but I/O space must start from 0. */ -#define CONFIG_SYS_PCI1_MEM_BASE 0x80000000 -#define CONFIG_SYS_PCI1_MEM_PHYS CONFIG_SYS_PCI1_MEM_BASE +#define CONFIG_SYS_PCI1_MEM_BUS 0x80000000 +#define CONFIG_SYS_PCI1_MEM_PHYS CONFIG_SYS_PCI1_MEM_BUS #define CONFIG_SYS_PCI1_MEM_SIZE 0x40000000 /* 1G */ -#define CONFIG_SYS_PCI1_IO_BASE 0x00000000 +#define CONFIG_SYS_PCI1_IO_BUS 0x00000000 #define CONFIG_SYS_PCI1_IO_PHYS 0xe8000000 #define CONFIG_SYS_PCI1_IO_SIZE 0x00800000 /* 1M */
diff --git a/include/configs/XPEDITE5370.h b/include/configs/XPEDITE5370.h index 8225fff..9ed4ffa 100644 --- a/include/configs/XPEDITE5370.h +++ b/include/configs/XPEDITE5370.h @@ -330,18 +330,18 @@ extern unsigned long get_board_ddr_clk(unsigned long dummy); * Memory space is mapped 1-1, but I/O space must start from 0. */ /* PCIE1 - VPX P1 */ -#define CONFIG_SYS_PCIE1_MEM_BASE 0x80000000 -#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BASE +#define CONFIG_SYS_PCIE1_MEM_BUS 0x80000000 +#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BUS #define CONFIG_SYS_PCIE1_MEM_SIZE 0x40000000 /* 1G */ -#define CONFIG_SYS_PCIE1_IO_BASE 0x00000000 +#define CONFIG_SYS_PCIE1_IO_BUS 0x00000000 #define CONFIG_SYS_PCIE1_IO_PHYS 0xe8000000 #define CONFIG_SYS_PCIE1_IO_SIZE 0x00800000 /* 8M */
/* PCIE2 - PEX8518 */ -#define CONFIG_SYS_PCIE2_MEM_BASE 0xc0000000 -#define CONFIG_SYS_PCIE2_MEM_PHYS CONFIG_SYS_PCIE2_MEM_BASE +#define CONFIG_SYS_PCIE2_MEM_BUS 0xc0000000 +#define CONFIG_SYS_PCIE2_MEM_PHYS CONFIG_SYS_PCIE2_MEM_BUS #define CONFIG_SYS_PCIE2_MEM_SIZE 0x10000000 /* 256M */ -#define CONFIG_SYS_PCIE2_IO_BASE 0x00000000 +#define CONFIG_SYS_PCIE2_IO_BUS 0x00000000 #define CONFIG_SYS_PCIE2_IO_PHYS 0xe8800000 #define CONFIG_SYS_PCIE2_IO_SIZE 0x00800000 /* 8M */
diff --git a/include/configs/XPEDITE5500.h b/include/configs/XPEDITE5500.h index b618e3b..a76ba84 100644 --- a/include/configs/XPEDITE5500.h +++ b/include/configs/XPEDITE5500.h @@ -311,10 +311,10 @@ extern unsigned long get_board_ddr_clk(unsigned long dummy); */
/* controller 1 - PEX8112 or XMC, depending on build option */ -#define CONFIG_SYS_PCIE1_MEM_BASE 0x80000000 -#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BASE +#define CONFIG_SYS_PCIE1_MEM_BUS 0x80000000 +#define CONFIG_SYS_PCIE1_MEM_PHYS CONFIG_SYS_PCIE1_MEM_BUS #define CONFIG_SYS_PCIE1_MEM_SIZE 0x40000000 /* 1G */ -#define CONFIG_SYS_PCIE1_IO_BASE 0x00000000 +#define CONFIG_SYS_PCIE1_IO_BUS 0x00000000 #define CONFIG_SYS_PCIE1_IO_PHYS 0xe8000000 #define CONFIG_SYS_PCIE1_IO_SIZE 0x00800000 /* 8M */