imx6: proper fix for io-remap

The previous patch was not the proper fix for PCI devices that require io
resources.  The new patch is the proper fix backported from mainline.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

SVN-Revision: 39133

2 files changed, 59 insertions, 104 deletions

diff --git a/target/linux/imx6/patches-3.12/0030-PCI-imx6-remove-outbound-io-mem-ATU-region-mapping.patch b/target/linux/imx6/patches-3.12/0030-PCI-imx6-remove-outbound-io-mem-ATU-region-mapping.patch
deleted file mode 100644
index de93ac8f42..0000000000
--- a/target/linux/imx6/patches-3.12/0030-PCI-imx6-remove-outbound-io-mem-ATU-region-mapping.patch
+++ /dev/null
@@ -1,104 +0,0 @@
-From: Tim Harvey <tharvey@gateworks.com>
-Subject: [PATCH] PCI: imx6: remove outbound io/mem ATU region mapping
-
-The IMX6 iATU is used for address translation between the AXI bus
-address space and PCI address space.  This is used for type0 and type1
-config cycles but is not necessary for outbound io/mem regions.
-
-This patch removes the calls that inappropriately re-configures the ATU
-viewport for outbound memory and IO after config cycles and removes them
-altogether as they are not necessary.
-
-This resolves issues with PCI devices behind switches and has been tested with
-a Gige device behind a PLX PEX860x switch.
-
-Signed-off-by: Tim Harvey <tharvey@gateworks.com>
----
- drivers/pci/host/pcie-designware.c |   41 +++---------------------------------
- 1 file changed, 3 insertions(+), 38 deletions(-)
-
---- a/drivers/pci/host/pcie-designware.c
-+++ b/drivers/pci/host/pcie-designware.c
-@@ -43,7 +43,6 @@
- #define PCIE_ATU_VIEWPORT		0x900
- #define PCIE_ATU_REGION_INBOUND		(0x1 << 31)
- #define PCIE_ATU_REGION_OUTBOUND	(0x0 << 31)
--#define PCIE_ATU_REGION_INDEX1		(0x1 << 0)
- #define PCIE_ATU_REGION_INDEX0		(0x0 << 0)
- #define PCIE_ATU_CR1			0x904
- #define PCIE_ATU_TYPE_MEM		(0x0 << 0)
-@@ -264,8 +263,8 @@ static void dw_pcie_prog_viewport_cfg0(s
- 
- static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev)
- {
--	/* Program viewport 1 : OUTBOUND : CFG1 */
--	dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
-+	/* Program viewport 0 : OUTBOUND : CFG1 */
-+	dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
- 			  PCIE_ATU_VIEWPORT);
- 	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
- 	dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
-@@ -275,38 +274,8 @@ static void dw_pcie_prog_viewport_cfg1(s
- 			  PCIE_ATU_LIMIT);
- 	dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET);
- 	dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET);
--}
--
--static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp)
--{
--	/* Program viewport 0 : OUTBOUND : MEM */
--	dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0,
--			  PCIE_ATU_VIEWPORT);
--	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1);
--	dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
--	dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE);
--	dw_pcie_writel_rc(pp, (pp->mem_base >> 32), PCIE_ATU_UPPER_BASE);
--	dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1,
--			  PCIE_ATU_LIMIT);
--	dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, PCIE_ATU_LOWER_TARGET);
--	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr),
--			  PCIE_ATU_UPPER_TARGET);
--}
--
--static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp)
--{
--	/* Program viewport 1 : OUTBOUND : IO */
--	dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1,
--			  PCIE_ATU_VIEWPORT);
--	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1);
-+	dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1);
- 	dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
--	dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE);
--	dw_pcie_writel_rc(pp, (pp->io_base >> 32), PCIE_ATU_UPPER_BASE);
--	dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1,
--			  PCIE_ATU_LIMIT);
--	dw_pcie_writel_rc(pp, pp->config.io_bus_addr, PCIE_ATU_LOWER_TARGET);
--	dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr),
--			  PCIE_ATU_UPPER_TARGET);
- }
- 
- static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
-@@ -322,11 +291,9 @@ static int dw_pcie_rd_other_conf(struct
- 	if (bus->parent->number == pp->root_bus_nr) {
- 		dw_pcie_prog_viewport_cfg0(pp, busdev);
- 		ret = cfg_read(pp->va_cfg0_base + address, where, size, val);
--		dw_pcie_prog_viewport_mem_outbound(pp);
- 	} else {
- 		dw_pcie_prog_viewport_cfg1(pp, busdev);
- 		ret = cfg_read(pp->va_cfg1_base + address, where, size, val);
--		dw_pcie_prog_viewport_io_outbound(pp);
- 	}
- 
- 	return ret;
-@@ -345,11 +312,9 @@ static int dw_pcie_wr_other_conf(struct
- 	if (bus->parent->number == pp->root_bus_nr) {
- 		dw_pcie_prog_viewport_cfg0(pp, busdev);
- 		ret = cfg_write(pp->va_cfg0_base + address, where, size, val);
--		dw_pcie_prog_viewport_mem_outbound(pp);
- 	} else {
- 		dw_pcie_prog_viewport_cfg1(pp, busdev);
- 		ret = cfg_write(pp->va_cfg1_base + address, where, size, val);
--		dw_pcie_prog_viewport_io_outbound(pp);
- 	}
- 
- 	return ret;
diff --git a/target/linux/imx6/patches-3.12/0030-pcie-designware-fix-io-transfers.patch b/target/linux/imx6/patches-3.12/0030-pcie-designware-fix-io-transfers.patch
new file mode 100644
index 0000000000..2445bc7a5d
--- /dev/null
+++ b/target/linux/imx6/patches-3.12/0030-pcie-designware-fix-io-transfers.patch
@@ -0,0 +1,59 @@
+From: Pratyush Anand <pratyush.anand@st.com>
+
+pp->io_base which is the input of the outbound IO address translation
+unit should be the cpu address, it was programmed wrongly to realio
+address.
+
+We should pass global_io_offset rather than sys->io_offset to
+pci_ioremap_io, so we map the new window into the first available spot
+in the Linux view of the I/O space.
+
+We must also pass cpu address instead  of realio address to
+pci_ioremap_io.
+
+This patch fixes above issue. It has been tested with Lecroy PTC in AIC
+mode and Pericom PI7C9X2G303EL PCIe switch, which does not work
+otherwise.
+
+Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
+Tested-by: Mohit Kumar <mohit.kumar@st.com>
+Tested-by: Tim Harvey <tharvey@gateworks.com>
+Cc: Arnd Bergmann <arnd@arndb.de>
+Cc: Marek Vasut <marex@denx.de>
+Cc: Richard Zhu <Hong-Xing.Zhu@freescale.com>
+Cc: linux-pci@vger.kernel.org
+Cc: spear-devel@list.st.com
+---
+ drivers/pci/host/pcie-designware.c |    5 ++---
+ 1 files changed, 2 insertions(+), 3 deletions(-)
+
+http://thread.gmane.org/gmane.linux.kernel.pci/27204
+
+diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
+--- a/drivers/pci/host/pcie-designware.c
++++ b/drivers/pci/host/pcie-designware.c
+@@ -177,6 +177,7 @@ int __init dw_pcie_host_init(struct pcie
+ 					   + global_io_offset);
+ 			pp->config.io_size = resource_size(&pp->io);
+ 			pp->config.io_bus_addr = range.pci_addr;
++			pp->io_base = range.cpu_addr;
+ 		}
+ 		if (restype == IORESOURCE_MEM) {
+ 			of_pci_range_to_resource(&range, np, &pp->mem);
+@@ -202,7 +203,6 @@ int __init dw_pcie_host_init(struct pcie
+ 
+ 	pp->cfg0_base = pp->cfg.start;
+ 	pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
+-	pp->io_base = pp->io.start;
+ 	pp->mem_base = pp->mem.start;
+ 
+ 	pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
+@@ -449,7 +449,7 @@ int dw_pcie_setup(int nr, struct pci_sys
+ 
+ 	if (global_io_offset < SZ_1M && pp->config.io_size > 0) {
+ 		sys->io_offset = global_io_offset - pp->config.io_bus_addr;
+-		pci_ioremap_io(sys->io_offset, pp->io.start);
++		pci_ioremap_io(global_io_offset, pp->io_base);
+ 		global_io_offset += SZ_64K;
+ 		pci_add_resource_offset(&sys->resources, &pp->io,
+ 					sys->io_offset);