[ARM] 4348/4: iop3xx: Give Linux control over PCI initialization

Currently the iop3xx platform support code assumes that RedBoot is the
bootloader and has already initialized the ATU. Linux should handle this
initialization for three reasons:

1/ The memory map that RedBoot sets up is not optimal (page_to_dma and
virt_to_phys return different addresses). The effect of this is that using
the dma mapping API for the internal bus dma units generates pci bus
addresses that are incorrect for the internal bus.

2/ Not all iop platforms use RedBoot

3/ If the ATU is already initialized it indicates that the iop is an add-in
card in another host, it does not own the PCI bus, and should not be
re-initialized.

Changelog:
* rather than change nr_controllers to zero, simply do not call
pci_common_init

Cc: Lennert Buytenhek <[e-mail]>
Signed-off-by: Dan Williams <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-iop32x/Kconfig

···
 	  Say Y here if you want to run your kernel on the Thecus n2100
 	  NAS appliance.
 
+config IOP3XX_ATU
+        bool "Enable the PCI Controller"
+        default y
+        help
+          Say Y here if you want the IOP to initialize its PCI Controller.
+          Say N if the IOP is an add in card, the host system owns the PCI
+          bus in this case.
+
 endmenu
 
 endif

arch/arm/mach-iop32x/iq31244.c

···
 
 static int __init iq31244_pci_init(void)
 {
-	if (is_ep80219())
-		pci_common_init(&ep80219_pci);
-	else if (machine_is_iq31244()) {
+	if (is_ep80219()) {
+		if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+			pci_common_init(&ep80219_pci);
+	} else if (machine_is_iq31244()) {
 		if (is_80219()) {
 			printk("note: iq31244 board type has been selected\n");
 			printk("note: to select ep80219 operation:\n");
···
 			printk("\t2/ update boot loader to pass"
 				" the ep80219 id: %d\n", MACH_TYPE_EP80219);
 		}
-		pci_common_init(&iq31244_pci);
+
+		if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+			pci_common_init(&iq31244_pci);
 	}
 
 	return 0;

arch/arm/mach-iop32x/iq80321.c

···
 
 static int __init iq80321_pci_init(void)
 {
-	if (machine_is_iq80321())
+	if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+		machine_is_iq80321())
 		pci_common_init(&iq80321_pci);
 
 	return 0;

arch/arm/mach-iop33x/Kconfig

···
 	  Say Y here if you want to run your kernel on the Intel IQ80332
 	  evaluation kit for the IOP332 chipset.
 
+config IOP3XX_ATU
+	bool "Enable the PCI Controller"
+	default y
+	help
+	  Say Y here if you want the IOP to initialize its PCI Controller.
+	  Say N if the IOP is an add in card, the host system owns the PCI
+	  bus in this case.
+
 endmenu
 
 endif

arch/arm/mach-iop33x/iq80331.c

···
 
 static int __init iq80331_pci_init(void)
 {
-	if (machine_is_iq80331())
+	if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+		machine_is_iq80331())
 		pci_common_init(&iq80331_pci);
 
 	return 0;

arch/arm/mach-iop33x/iq80332.c

···
 
 static int __init iq80332_pci_init(void)
 {
-	if (machine_is_iq80332())
+	if ((iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) &&
+		machine_is_iq80332())
 		pci_common_init(&iq80332_pci);
 
 	return 0;

arch/arm/plat-iop/pci.c

···
  * This routine checks the status of the last configuration cycle.  If an error
  * was detected it returns a 1, else it returns a 0.  The errors being checked
  * are parity, master abort, target abort (master and target).  These types of
- * errors occure during a config cycle where there is no device, like during
+ * errors occur during a config cycle where there is no device, like during
  * the discovery stage.
  */
 static int iop3xx_pci_status(void)
···
 	return pci_scan_bus(sys->busnr, &iop3xx_ops, sys);
 }
 
+void __init iop3xx_atu_setup(void)
+{
+	/* BAR 0 ( Disabled ) */
+	*IOP3XX_IAUBAR0 = 0x0;
+	*IOP3XX_IABAR0  = 0x0;
+	*IOP3XX_IATVR0  = 0x0;
+	*IOP3XX_IALR0   = 0x0;
+
+	/* BAR 1 ( Disabled ) */
+	*IOP3XX_IAUBAR1 = 0x0;
+	*IOP3XX_IABAR1  = 0x0;
+	*IOP3XX_IALR1   = 0x0;
+
+	/* BAR 2 (1:1 mapping with Physical RAM) */
+	/* Set limit and enable */
+	*IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
+	*IOP3XX_IAUBAR2 = 0x0;
+
+	/* Align the inbound bar with the base of memory */
+	*IOP3XX_IABAR2 = PHYS_OFFSET |
+			       PCI_BASE_ADDRESS_MEM_TYPE_64 |
+			       PCI_BASE_ADDRESS_MEM_PREFETCH;
+
+	*IOP3XX_IATVR2 = PHYS_OFFSET;
+
+	/* Outbound window 0 */
+	*IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_PA;
+	*IOP3XX_OUMWTVR0 = 0;
+
+	/* Outbound window 1 */
+	*IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE;
+	*IOP3XX_OUMWTVR1 = 0;
+
+	/* BAR 3 ( Disabled ) */
+	*IOP3XX_IAUBAR3 = 0x0;
+	*IOP3XX_IABAR3  = 0x0;
+	*IOP3XX_IATVR3  = 0x0;
+	*IOP3XX_IALR3   = 0x0;
+
+	/* Setup the I/O Bar
+	 */
+	*IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_PA;;
+
+	/* Enable inbound and outbound cycles
+	 */
+	*IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+			       PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
+	*IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
+}
+
+void __init iop3xx_atu_disable(void)
+{
+	*IOP3XX_ATUCMD = 0;
+	*IOP3XX_ATUCR = 0;
+
+	/* wait for cycles to quiesce */
+	while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
+				     IOP3XX_PCSR_IN_Q_BUSY))
+		cpu_relax();
+
+	/* BAR 0 ( Disabled ) */
+	*IOP3XX_IAUBAR0 = 0x0;
+	*IOP3XX_IABAR0  = 0x0;
+	*IOP3XX_IATVR0  = 0x0;
+	*IOP3XX_IALR0   = 0x0;
+
+	/* BAR 1 ( Disabled ) */
+	*IOP3XX_IAUBAR1 = 0x0;
+	*IOP3XX_IABAR1  = 0x0;
+	*IOP3XX_IALR1   = 0x0;
+
+	/* BAR 2 ( Disabled ) */
+	*IOP3XX_IAUBAR2 = 0x0;
+	*IOP3XX_IABAR2  = 0x0;
+	*IOP3XX_IATVR2  = 0x0;
+	*IOP3XX_IALR2   = 0x0;
+
+	/* BAR 3 ( Disabled ) */
+	*IOP3XX_IAUBAR3 = 0x0;
+	*IOP3XX_IABAR3  = 0x0;
+	*IOP3XX_IATVR3  = 0x0;
+	*IOP3XX_IALR3   = 0x0;
+
+	/* Clear the outbound windows */
+	*IOP3XX_OIOWTVR  = 0;
+
+	/* Outbound window 0 */
+	*IOP3XX_OMWTVR0 = 0;
+	*IOP3XX_OUMWTVR0 = 0;
+
+	/* Outbound window 1 */
+	*IOP3XX_OMWTVR1 = 0;
+	*IOP3XX_OUMWTVR1 = 0;
+}
+
+/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
+int init_atu;
+
 void iop3xx_pci_preinit(void)
 {
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
+		iop3xx_atu_disable();
+		iop3xx_atu_setup();
+	}
+
 	DBG("PCI:  Intel 803xx PCI init code.\n");
 	DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
 	DBG("ATU: IOP3XX_OMWTVR0=0x%04x, IOP3XX_OIOWTVR=0x%04x\n",
···
 
 	hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, "imprecise external abort");
 }
+
+/* allow init_atu to be user overridden */
+static int __init iop3xx_init_atu_setup(char *str)
+{
+	init_atu = IOP3XX_INIT_ATU_DEFAULT;
+	if (str) {
+		while (*str != '\0') {
+			switch (*str) {
+			case 'y':
+			case 'Y':
+				init_atu = IOP3XX_INIT_ATU_ENABLE;
+				break;
+			case 'n':
+			case 'N':
+				init_atu = IOP3XX_INIT_ATU_DISABLE;
+				break;
+			case ',':
+			case '=':
+				break;
+			default:
+				printk(KERN_DEBUG "\"%s\" malformed at "
+					    "character: \'%c\'",
+					    __FUNCTION__,
+					    *str);
+				*(str + 1) = '\0';
+			}
+			str++;
+		}
+	}
+
+	return 1;
+}
+
+__setup("iop3xx_init_atu", iop3xx_init_atu_setup);
+

include/asm-arm/arch-iop32x/iop32x.h

···
 
 #include <asm/hardware/iop3xx.h>
 
+/* ATU Parameters
+ * set up a 1:1 bus to physical ram relationship
+ * w/ physical ram on top of pci in the memory map
+ */
+#define IOP32X_MAX_RAM_SIZE            0x40000000UL
+#define IOP3XX_MAX_RAM_SIZE            IOP32X_MAX_RAM_SIZE
+#define IOP3XX_PCI_LOWER_MEM_BA        0x80000000
+#define IOP32X_PCI_MEM_WINDOW_SIZE     0x04000000
+#define IOP3XX_PCI_MEM_WINDOW_SIZE     IOP32X_PCI_MEM_WINDOW_SIZE
 
 #endif

include/asm-arm/arch-iop32x/memory.h

···
  * bus_to_virt: Used to convert an address for DMA operations
  *		to an address that the kernel can use.
  */
-#define __virt_to_bus(x)	(((__virt_to_phys(x)) & ~(*IOP3XX_IATVR2)) | ((*IOP3XX_IABAR2) & 0xfffffff0))
-#define __bus_to_virt(x)	(__phys_to_virt(((x) & ~(*IOP3XX_IALR2)) | ( *IOP3XX_IATVR2)))
+#define __virt_to_bus(x)	(__virt_to_phys(x))
+#define __bus_to_virt(x)	(__phys_to_virt(x))
 
 
 #endif

include/asm-arm/arch-iop33x/iop33x.h

···
 #define IOP33X_UART1_PHYS	(IOP3XX_PERIPHERAL_PHYS_BASE + 0x1740)
 #define IOP33X_UART1_VIRT	(IOP3XX_PERIPHERAL_VIRT_BASE + 0x1740)
 
+/* ATU Parameters
+ * set up a 1:1 bus to physical ram relationship
+ * w/ pci on top of physical ram in memory map
+ */
+#define IOP33X_MAX_RAM_SIZE		0x80000000UL
+#define IOP3XX_MAX_RAM_SIZE		IOP33X_MAX_RAM_SIZE
+#define IOP3XX_PCI_LOWER_MEM_BA	(PHYS_OFFSET + IOP33X_MAX_RAM_SIZE)
+#define IOP33X_PCI_MEM_WINDOW_SIZE	0x08000000
+#define IOP3XX_PCI_MEM_WINDOW_SIZE	IOP33X_PCI_MEM_WINDOW_SIZE
+
 
 #endif

include/asm-arm/arch-iop33x/memory.h

···
  * bus_to_virt: Used to convert an address for DMA operations
  *		to an address that the kernel can use.
  */
-#define __virt_to_bus(x)	(((__virt_to_phys(x)) & ~(*IOP3XX_IATVR2)) | ((*IOP3XX_IABAR2) & 0xfffffff0))
-#define __bus_to_virt(x)	(__phys_to_virt(((x) & ~(*IOP3XX_IALR2)) | ( *IOP3XX_IATVR2)))
+#define __virt_to_bus(x)	(__virt_to_phys(x))
+#define __bus_to_virt(x)	(__phys_to_virt(x))
 
 
 #endif

include/asm-arm/hardware/iop3xx.h

···
 extern void gpio_line_config(int line, int direction);
 extern int  gpio_line_get(int line);
 extern void gpio_line_set(int line, int value);
+extern int init_atu;
 #endif
 
 
···
 #define IOP3XX_PCIXCMD		(volatile u16 *)IOP3XX_REG_ADDR(0x01e2)
 #define IOP3XX_PCIXSR		(volatile u32 *)IOP3XX_REG_ADDR(0x01e4)
 #define IOP3XX_PCIIRSR		(volatile u32 *)IOP3XX_REG_ADDR(0x01ec)
+#define IOP3XX_PCSR_OUT_Q_BUSY (1 << 15)
+#define IOP3XX_PCSR_IN_Q_BUSY	(1 << 14)
+#define IOP3XX_ATUCR_OUT_EN	(1 << 1)
+
+#define IOP3XX_INIT_ATU_DEFAULT 0
+#define IOP3XX_INIT_ATU_DISABLE -1
+#define IOP3XX_INIT_ATU_ENABLE	 1
+
+#ifdef CONFIG_IOP3XX_ATU
+#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
+				IOP3XX_INIT_ATU_ENABLE : init_atu)
+#else
+#define iop3xx_get_init_atu(x) (init_atu == IOP3XX_INIT_ATU_DEFAULT ?\
+				IOP3XX_INIT_ATU_DISABLE : init_atu)
+#endif
 
 /* Messaging Unit  */
 #define IOP3XX_IMR0		(volatile u32 *)IOP3XX_REG_ADDR(0x0310)
···
 /*
  * IOP3XX I/O and Mem space regions for PCI autoconfiguration
  */
-#define IOP3XX_PCI_MEM_WINDOW_SIZE	0x04000000
-#define IOP3XX_PCI_LOWER_MEM_PA		0x80000000
-#define IOP3XX_PCI_LOWER_MEM_BA		(*IOP3XX_OMWTVR0)
+#define IOP3XX_PCI_LOWER_MEM_PA	0x80000000
 
 #define IOP3XX_PCI_IO_WINDOW_SIZE	0x00010000
 #define IOP3XX_PCI_LOWER_IO_PA		0x90000000
 #define IOP3XX_PCI_LOWER_IO_VA		0xfe000000
-#define IOP3XX_PCI_LOWER_IO_BA		(*IOP3XX_OIOWTVR)
+#define IOP3XX_PCI_LOWER_IO_BA		0x90000000
 #define IOP3XX_PCI_UPPER_IO_PA		(IOP3XX_PCI_LOWER_IO_PA +\
 					IOP3XX_PCI_IO_WINDOW_SIZE - 1)
 #define IOP3XX_PCI_UPPER_IO_VA		(IOP3XX_PCI_LOWER_IO_VA +\