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Documentation/arm/Samsung-S3C24XX/USB-Host.txt
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Documentation/arm/Samsung-S3C24XX/USB-Host.txt
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S3C24XX USB Host support
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========================
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Introduction
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------------
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This document details the S3C2410/S3C2440 in-built OHCI USB host support.
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Configuration
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-------------
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Enable at least the following kernel options:
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menuconfig:
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Device Drivers --->
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USB support --->
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<*> Support for Host-side USB
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<*> OHCI HCD support
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.config:
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CONFIG_USB
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CONFIG_USB_OHCI_HCD
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Once these options are configured, the standard set of USB device
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drivers can be configured and used.
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Board Support
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-------------
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The driver attaches to a platform device, which will need to be
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added by the board specific support file in linux/arch/arm/mach-s3c2410,
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such as mach-bast.c or mach-smdk2410.c
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The platform device's platform_data field is only needed if the
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board implements extra power control or over-current monitoring.
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The OHCI driver does not ensure the state of the S3C2410's MISCCTRL
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register, so if both ports are to be used for the host, then it is
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the board support file's responsibility to ensure that the second
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port is configured to be connected to the OHCI core.
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Platform Data
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-------------
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See linux/include/asm-arm/arch-s3c2410/usb-control.h for the
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descriptions of the platform device data. An implementation
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can be found in linux/arch/arm/mach-s3c2410/usb-simtec.c .
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The `struct s3c2410_hcd_info` contains a pair of functions
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that get called to enable over-current detection, and to
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control the port power status.
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The ports are numbered 0 and 1.
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power_control:
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Called to enable or disable the power on the port.
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enable_oc:
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Called to enable or disable the over-current monitoring.
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This should claim or release the resources being used to
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check the power condition on the port, such as an IRQ.
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report_oc:
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The OHCI driver fills this field in for the over-current code
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to call when there is a change to the over-current state on
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an port. The ports argument is a bitmask of 1 bit per port,
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with bit X being 1 for an over-current on port X.
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The function s3c2410_usb_report_oc() has been provided to
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ensure this is called correctly.
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port[x]:
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This is struct describes each port, 0 or 1. The platform driver
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should set the flags field of each port to S3C_HCDFLG_USED if
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the port is enabled.
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Document Author
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---------------
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Ben Dooks, (c) 2005 Simtec Electronics
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@ -1,6 +1,6 @@
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/* linux/arch/arm/mach-s3c2410/usb-simtec.c
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*
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* Copyright (c) 2004 Simtec Electronics
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* Copyright (c) 2004,2005 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* http://www.simtec.co.uk/products/EB2410ITX/
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@ -14,6 +14,8 @@
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* Modifications:
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* 14-Sep-2004 BJD Created
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* 18-Oct-2004 BJD Cleanups, and added code to report OC cleared
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* 09-Aug-2005 BJD Renamed s3c2410_report_oc to s3c2410_usb_report_oc
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* 09-Aug-2005 BJD Ports powered only if both are enabled
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*/
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#define DEBUG
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* designed boards.
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*/
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static unsigned int power_state[2];
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static void
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usb_simtec_powercontrol(int port, int to)
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{
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pr_debug("usb_simtec_powercontrol(%d,%d)\n", port, to);
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if (port == 1)
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s3c2410_gpio_setpin(S3C2410_GPB4, to ? 0:1);
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power_state[port] = to;
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if (power_state[0] && power_state[1])
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s3c2410_gpio_setpin(S3C2410_GPB4, 0);
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else
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s3c2410_gpio_setpin(S3C2410_GPB4, 1);
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}
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static irqreturn_t
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if (s3c2410_gpio_getpin(S3C2410_GPG10) == 0) {
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pr_debug("usb_simtec: over-current irq (oc detected)\n");
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s3c2410_report_oc(info, 3);
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s3c2410_usb_report_oc(info, 3);
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} else {
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pr_debug("usb_simtec: over-current irq (oc cleared)\n");
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s3c2410_report_oc(info, 0);
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s3c2410_usb_report_oc(info, 0);
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}
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return IRQ_HANDLED;
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@ -383,6 +383,7 @@ static void __init build_mem_type_table(void)
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{
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struct cachepolicy *cp;
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unsigned int cr = get_cr();
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unsigned int user_pgprot;
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int cpu_arch = cpu_architecture();
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int i;
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@ -408,6 +409,9 @@ static void __init build_mem_type_table(void)
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}
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}
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cp = &cache_policies[cachepolicy];
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user_pgprot = cp->pte;
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/*
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* ARMv6 and above have extended page tables.
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*/
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@ -426,11 +430,18 @@ static void __init build_mem_type_table(void)
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mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
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mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
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/*
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* Mark the device area as "shared device"
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*/
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mem_types[MT_DEVICE].prot_pte |= L_PTE_BUFFERABLE;
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mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
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}
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cp = &cache_policies[cachepolicy];
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/*
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* User pages need to be mapped with the ASID
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* (iow, non-global)
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*/
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user_pgprot |= L_PTE_ASID;
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}
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if (cpu_arch >= CPU_ARCH_ARMv5) {
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mem_types[MT_LOW_VECTORS].prot_pte |= cp->pte & PTE_CACHEABLE;
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for (i = 0; i < 16; i++) {
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unsigned long v = pgprot_val(protection_map[i]);
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v &= (~(PTE_BUFFERABLE|PTE_CACHEABLE)) | cp->pte;
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v &= (~(PTE_BUFFERABLE|PTE_CACHEABLE)) | user_pgprot;
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protection_map[i] = __pgprot(v);
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}
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@ -111,12 +111,6 @@ ENTRY(cpu_v6_switch_mm)
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mcr p15, 0, r1, c13, c0, 1 @ set context ID
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mov pc, lr
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#define nG (1 << 11)
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#define APX (1 << 9)
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#define AP1 (1 << 5)
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#define AP0 (1 << 4)
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#define XN (1 << 0)
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/*
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* cpu_v6_set_pte(ptep, pte)
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*
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ENTRY(cpu_v6_set_pte)
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str r1, [r0], #-2048 @ linux version
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bic r2, r1, #0x00000ff0
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bic r2, r1, #0x000007f0
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bic r2, r2, #0x00000003
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orr r2, r2, #AP0 | 2
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orr r2, r2, #PTE_EXT_AP0 | 2
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tst r1, #L_PTE_WRITE
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tstne r1, #L_PTE_DIRTY
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orreq r2, r2, #APX
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orreq r2, r2, #PTE_EXT_APX
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tst r1, #L_PTE_USER
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orrne r2, r2, #AP1 | nG
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tstne r2, #APX
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bicne r2, r2, #APX | AP0
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orrne r2, r2, #PTE_EXT_AP1
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tstne r2, #PTE_EXT_APX
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bicne r2, r2, #PTE_EXT_APX | PTE_EXT_AP0
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tst r1, #L_PTE_YOUNG
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biceq r2, r2, #APX | AP1 | AP0
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biceq r2, r2, #PTE_EXT_APX | PTE_EXT_AP_MASK
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@ tst r1, #L_PTE_EXEC
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@ orreq r2, r2, #XN
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@ orreq r2, r2, #PTE_EXT_XN
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tst r1, #L_PTE_PRESENT
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moveq r2, #0
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@ -717,6 +717,9 @@ static void pxafb_enable_controller(struct pxafb_info *fbi)
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DPRINTK("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
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DPRINTK("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);
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/* enable LCD controller clock */
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pxa_set_cken(CKEN16_LCD, 1);
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/* Sequence from 11.7.10 */
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LCCR3 = fbi->reg_lccr3;
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LCCR2 = fbi->reg_lccr2;
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schedule_timeout(20 * HZ / 1000);
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remove_wait_queue(&fbi->ctrlr_wait, &wait);
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/* disable LCD controller clock */
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pxa_set_cken(CKEN16_LCD, 0);
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}
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/*
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ret = -ENOMEM;
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goto failed;
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}
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/* enable LCD controller clock */
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pxa_set_cken(CKEN16_LCD, 1);
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ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, "LCD", fbi);
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if (ret) {
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@ -12,6 +12,7 @@
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* Changelog:
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* 11-Sep-2004 BJD Created file
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* 21-Sep-2004 BJD Updated port info
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* 09-Aug-2005 BJD Renamed s3c2410_report_oc s3c2410_usb_report_oc
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*/
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#ifndef __ASM_ARCH_USBCONTROL_H
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void (*report_oc)(struct s3c2410_hcd_info *, int ports);
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};
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static void inline s3c2410_report_oc(struct s3c2410_hcd_info *info, int ports)
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static void inline s3c2410_usb_report_oc(struct s3c2410_hcd_info *info, int ports)
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{
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if (info->report_oc != NULL) {
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(info->report_oc)(info, ports);
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@ -188,12 +188,18 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
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/*
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* - extended small page/tiny page
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*/
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#define PTE_EXT_XN (1 << 0) /* v6 */
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#define PTE_EXT_AP_MASK (3 << 4)
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#define PTE_EXT_AP0 (1 << 4)
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#define PTE_EXT_AP1 (2 << 4)
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#define PTE_EXT_AP_UNO_SRO (0 << 4)
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#define PTE_EXT_AP_UNO_SRW (1 << 4)
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#define PTE_EXT_AP_URO_SRW (2 << 4)
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#define PTE_EXT_AP_URW_SRW (3 << 4)
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#define PTE_EXT_AP_UNO_SRW (PTE_EXT_AP0)
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#define PTE_EXT_AP_URO_SRW (PTE_EXT_AP1)
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#define PTE_EXT_AP_URW_SRW (PTE_EXT_AP1|PTE_EXT_AP0)
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#define PTE_EXT_TEX(x) ((x) << 6) /* v5 */
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#define PTE_EXT_APX (1 << 9) /* v6 */
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#define PTE_EXT_SHARED (1 << 10) /* v6 */
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#define PTE_EXT_NG (1 << 11) /* v6 */
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/*
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* - small page
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#define L_PTE_WRITE (1 << 5)
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#define L_PTE_EXEC (1 << 6)
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#define L_PTE_DIRTY (1 << 7)
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#define L_PTE_SHARED (1 << 10) /* shared between CPUs (v6) */
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#define L_PTE_ASID (1 << 11) /* non-global (use ASID, v6) */
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#ifndef __ASSEMBLY__
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