Re: [PATCH 18/19] iop3xx: Give Linux control over PCI (ATU) initialization

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 

Dan Williams wrote:

From: Dan Williams <[email protected]>

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.

Signed-off-by: Dan Williams <[email protected]>
---

 arch/arm/mach-iop32x/Kconfig         |    8 ++
 arch/arm/mach-iop32x/ep80219.c       |    4 +
 arch/arm/mach-iop32x/iq31244.c       |    5 +
 arch/arm/mach-iop32x/iq80321.c       |    5 +
 arch/arm/mach-iop33x/Kconfig         |    8 ++
 arch/arm/mach-iop33x/iq80331.c       |    5 +
 arch/arm/mach-iop33x/iq80332.c       |    4 +
 arch/arm/plat-iop/pci.c              |  140 ++++++++++++++++++++++++++++++++++
 include/asm-arm/arch-iop32x/iop32x.h |    9 ++
 include/asm-arm/arch-iop32x/memory.h |    4 -
 include/asm-arm/arch-iop33x/iop33x.h |   10 ++
 include/asm-arm/arch-iop33x/memory.h |    4 -
 include/asm-arm/hardware/iop3xx.h    |   20 ++++-
 13 files changed, 214 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-iop32x/Kconfig b/arch/arm/mach-iop32x/Kconfig
index 05549a5..b2788e3 100644
--- a/arch/arm/mach-iop32x/Kconfig
+++ b/arch/arm/mach-iop32x/Kconfig
@@ -22,6 +22,14 @@ config ARCH_IQ80321
 	  Say Y here if you want to run your kernel on the Intel IQ80321
 	  evaluation kit for the IOP321 processor.
+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 
diff --git a/arch/arm/mach-iop32x/ep80219.c b/arch/arm/mach-iop32x/ep80219.c
index f616d3e..1a5c586 100644
--- a/arch/arm/mach-iop32x/ep80219.c
+++ b/arch/arm/mach-iop32x/ep80219.c
@@ -100,7 +100,7 @@ ep80219_pci_map_irq(struct pci_dev *dev,
static struct hw_pci ep80219_pci __initdata = { 
 	.swizzle	= pci_std_swizzle,
-	.nr_controllers = 1,
+	.nr_controllers = 0,
 	.setup		= iop3xx_pci_setup,
 	.preinit	= iop3xx_pci_preinit,
 	.scan		= iop3xx_pci_scan_bus,
@@ -109,6 +109,8 @@ static struct hw_pci ep80219_pci __initd
static int __init ep80219_pci_init(void) 
 {
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+		ep80219_pci.nr_controllers = 1;
 #if 0
 	if (machine_is_ep80219())
 		pci_common_init(&ep80219_pci);
diff --git a/arch/arm/mach-iop32x/iq31244.c b/arch/arm/mach-iop32x/iq31244.c
index 967a696..25d5d62 100644
--- a/arch/arm/mach-iop32x/iq31244.c
+++ b/arch/arm/mach-iop32x/iq31244.c
@@ -97,7 +97,7 @@ iq31244_pci_map_irq(struct pci_dev *dev,
static struct hw_pci iq31244_pci __initdata = { 
 	.swizzle	= pci_std_swizzle,
-	.nr_controllers = 1,
+	.nr_controllers = 0,
 	.setup		= iop3xx_pci_setup,
 	.preinit	= iop3xx_pci_preinit,
 	.scan		= iop3xx_pci_scan_bus,
@@ -106,6 +106,9 @@ static struct hw_pci iq31244_pci __initd
static int __init iq31244_pci_init(void) 
 {
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+		iq31244_pci.nr_controllers = 1;
+
 	if (machine_is_iq31244())
 		pci_common_init(&iq31244_pci);
diff --git a/arch/arm/mach-iop32x/iq80321.c b/arch/arm/mach-iop32x/iq80321.c 
index ef4388c..cdd2265 100644
--- a/arch/arm/mach-iop32x/iq80321.c
+++ b/arch/arm/mach-iop32x/iq80321.c
@@ -97,7 +97,7 @@ iq80321_pci_map_irq(struct pci_dev *dev,
static struct hw_pci iq80321_pci __initdata = { 
 	.swizzle	= pci_std_swizzle,
-	.nr_controllers = 1,
+	.nr_controllers = 0,
 	.setup		= iop3xx_pci_setup,
 	.preinit	= iop3xx_pci_preinit,
 	.scan		= iop3xx_pci_scan_bus,
@@ -106,6 +106,9 @@ static struct hw_pci iq80321_pci __initd
static int __init iq80321_pci_init(void) 
 {
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+		iq80321_pci.nr_controllers = 1;
+
 	if (machine_is_iq80321())
 		pci_common_init(&iq80321_pci);
diff --git a/arch/arm/mach-iop33x/Kconfig b/arch/arm/mach-iop33x/Kconfig 
index 9aa016b..45598e0 100644
--- a/arch/arm/mach-iop33x/Kconfig
+++ b/arch/arm/mach-iop33x/Kconfig
@@ -16,6 +16,14 @@ config MACH_IQ80332
 	  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 
diff --git a/arch/arm/mach-iop33x/iq80331.c b/arch/arm/mach-iop33x/iq80331.c
index 7714c94..3807000 100644
--- a/arch/arm/mach-iop33x/iq80331.c
+++ b/arch/arm/mach-iop33x/iq80331.c
@@ -78,7 +78,7 @@ iq80331_pci_map_irq(struct pci_dev *dev,
static struct hw_pci iq80331_pci __initdata = { 
 	.swizzle	= pci_std_swizzle,
-	.nr_controllers = 1,
+	.nr_controllers = 0,
 	.setup		= iop3xx_pci_setup,
 	.preinit	= iop3xx_pci_preinit,
 	.scan		= iop3xx_pci_scan_bus,
@@ -87,6 +87,9 @@ static struct hw_pci iq80331_pci __initd
static int __init iq80331_pci_init(void) 
 {
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+		iq80331_pci.nr_controllers = 1;
+
 	if (machine_is_iq80331())
 		pci_common_init(&iq80331_pci);
diff --git a/arch/arm/mach-iop33x/iq80332.c b/arch/arm/mach-iop33x/iq80332.c 
index a3fa7f8..8780d55 100644
--- a/arch/arm/mach-iop33x/iq80332.c
+++ b/arch/arm/mach-iop33x/iq80332.c
@@ -93,6 +93,10 @@ static struct hw_pci iq80332_pci __initd
static int __init iq80332_pci_init(void) 
 {
+
+	if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE)
+		iq80332_pci.nr_controllers = 1;
+
 	if (machine_is_iq80332())
 		pci_common_init(&iq80332_pci);
diff --git a/arch/arm/plat-iop/pci.c b/arch/arm/plat-iop/pci.c 
index e647812..19aace9 100644
--- a/arch/arm/plat-iop/pci.c
+++ b/arch/arm/plat-iop/pci.c
@@ -55,7 +55,7 @@ static u32 iop3xx_cfg_address(struct pci
  * 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)
@@ -223,8 +223,111 @@ struct pci_bus *iop3xx_pci_scan_bus(int 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;
You should be using readl(), writel() variants rather than writing C code that appears to be normal, but in reality has hardware side-effects. 

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux