powerpc/85xx: Add SWIOTLB support to FSL boards

Add the platform-specific code for enabling SWIOTLB if needed on P2020DS,
MPC85xx DS, and MPC85xx MDS boards as they are capable of having >4G of
memory.

We determine if we need to enable swiotlb based on how much memory is in
the board and if it exceeds 4G or what we can map via PCI inbound
windows.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 43d385cedcd730e4595abcab85593488db868f4d..0ee5b12c7d9556838c29cdf031ad4c2b86752cad 100644 (file)
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -35,12 +35,14 @@ config MPC85xx_MDS
        select DEFAULT_UIMAGE
        select PHYLIB
        select HAS_RAPIDIO
+       select SWIOTLB
        help
          This option enables support for the MPC85xx MDS board
 
 config MPC8536_DS
        bool "Freescale MPC8536 DS"
        select DEFAULT_UIMAGE
+       select SWIOTLB
        help
          This option enables support for the MPC8536 DS board
 
@@ -49,6 +51,7 @@ config MPC85xx_DS
        select PPC_I8259
        select DEFAULT_UIMAGE
        select FSL_ULI1575
+       select SWIOTLB
        help
          This option enables support for the MPC85xx DS (MPC8544 DS) board
 

diff --git a/arch/powerpc/platforms/85xx/mpc8536_ds.c b/arch/powerpc/platforms/85xx/mpc8536_ds.c
index 63efca20d7bd12d0de6d143f02b227d290209efc..055ff417bae95a298461e2cab002deb6edad9581 100644 (file)
--- a/arch/powerpc/platforms/85xx/mpc8536_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc8536_ds.c
@@ -17,6 +17,7 @@
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
 #include <linux/of_platform.h>
+#include <linux/lmb.h>
 
 #include <asm/system.h>
 #include <asm/time.h>
@@ -26,6 +27,7 @@
 #include <asm/prom.h>
 #include <asm/udbg.h>
 #include <asm/mpic.h>
+#include <asm/swiotlb.h>
 
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
@@ -65,7 +67,9 @@ static void __init mpc8536_ds_setup_arch(void)
 {
 #ifdef CONFIG_PCI
        struct device_node *np;
+       struct pci_controller *hose;
 #endif
+       dma_addr_t max = 0xffffffff;
 
        if (ppc_md.progress)
                ppc_md.progress("mpc8536_ds_setup_arch()", 0);
@@ -80,11 +84,22 @@ static void __init mpc8536_ds_setup_arch(void)
                                fsl_add_bridge(np, 1);
                        else
                                fsl_add_bridge(np, 0);
+
+                       hose = pci_find_hose_for_OF_device(np);
+                       max = min(max, hose->dma_window_base_cur +
+                                       hose->dma_window_size);
                }
        }
 
 #endif
 
+#ifdef CONFIG_SWIOTLB
+       if (lmb_end_of_DRAM() > max) {
+               ppc_swiotlb_enable = 1;
+               set_pci_dma_ops(&swiotlb_pci_dma_ops);
+       }
+#endif
+
        printk("MPC8536 DS board from Freescale Semiconductor\n");
 }
 
@@ -102,6 +117,8 @@ static int __init mpc8536_ds_publish_devices(void)
 }
 machine_device_initcall(mpc8536_ds, mpc8536_ds_publish_devices);
 
+machine_arch_initcall(mpc8536_ds, swiotlb_setup_bus_notifier);
+
 /*
  * Called very early, device-tree isn't unflattened
  */

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_ds.c b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
index 53d5851a6c977986789d6f7e73d88ab038504325..849c0ac0025fd6d849fcb2eb9a295e542fb41155 100644 (file)
--- a/arch/powerpc/platforms/85xx/mpc85xx_ds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_ds.c
@@ -20,6 +20,7 @@
 #include <linux/seq_file.h>
 #include <linux/interrupt.h>
 #include <linux/of_platform.h>
+#include <linux/lmb.h>
 
 #include <asm/system.h>
 #include <asm/time.h>
@@ -30,6 +31,7 @@
 #include <asm/udbg.h>
 #include <asm/mpic.h>
 #include <asm/i8259.h>
+#include <asm/swiotlb.h>
 
 #include <sysdev/fsl_soc.h>
 #include <sysdev/fsl_pci.h>
@@ -155,7 +157,9 @@ static void __init mpc85xx_ds_setup_arch(void)
 {
 #ifdef CONFIG_PCI
        struct device_node *np;
+       struct pci_controller *hose;
 #endif
+       dma_addr_t max = 0xffffffff;
 
        if (ppc_md.progress)
                ppc_md.progress("mpc85xx_ds_setup_arch()", 0);
@@ -171,6 +175,10 @@ static void __init mpc85xx_ds_setup_arch(void)
                                fsl_add_bridge(np, 1);
                        else
                                fsl_add_bridge(np, 0);
+
+                       hose = pci_find_hose_for_OF_device(np);
+                       max = min(max, hose->dma_window_base_cur +
+                                       hose->dma_window_size);
                }
        }
 
@@ -181,6 +189,13 @@ static void __init mpc85xx_ds_setup_arch(void)
        mpc85xx_smp_init();
 #endif
 
+#ifdef CONFIG_SWIOTLB
+       if (lmb_end_of_DRAM() > max) {
+               ppc_swiotlb_enable = 1;
+               set_pci_dma_ops(&swiotlb_pci_dma_ops);
+       }
+#endif
+
        printk("MPC85xx DS board from Freescale Semiconductor\n");
 }
 
@@ -217,6 +232,10 @@ machine_device_initcall(mpc8544_ds, mpc85xxds_publish_devices);
 machine_device_initcall(mpc8572_ds, mpc85xxds_publish_devices);
 machine_device_initcall(p2020_ds, mpc85xxds_publish_devices);
 
+machine_arch_initcall(mpc8544_ds, swiotlb_setup_bus_notifier);
+machine_arch_initcall(mpc8572_ds, swiotlb_setup_bus_notifier);
+machine_arch_initcall(p2020_ds, swiotlb_setup_bus_notifier);
+
 /*
  * Called very early, device-tree isn't unflattened
  */

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
index b2c0a431997339e782c2ff1fe1847774d9361ff7..77f90b35635681f818e448645fcfa9a174dd4e67 100644 (file)
--- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
@@ -33,6 +33,7 @@
 #include <linux/of_platform.h>
 #include <linux/of_device.h>
 #include <linux/phy.h>
+#include <linux/lmb.h>
 
 #include <asm/system.h>
 #include <asm/atomic.h>
@@ -49,6 +50,7 @@
 #include <asm/qe.h>
 #include <asm/qe_ic.h>
 #include <asm/mpic.h>
+#include <asm/swiotlb.h>
 
 #undef DEBUG
 #ifdef DEBUG
@@ -155,6 +157,10 @@ static void __init mpc85xx_mds_setup_arch(void)
 {
        struct device_node *np;
        static u8 __iomem *bcsr_regs = NULL;
+#ifdef CONFIG_PCI
+       struct pci_controller *hose;
+#endif
+       dma_addr_t max = 0xffffffff;
 
        if (ppc_md.progress)
                ppc_md.progress("mpc85xx_mds_setup_arch()", 0);
@@ -179,6 +185,10 @@ static void __init mpc85xx_mds_setup_arch(void)
                                fsl_add_bridge(np, 1);
                        else
                                fsl_add_bridge(np, 0);
+
+                       hose = pci_find_hose_for_OF_device(np);
+                       max = min(max, hose->dma_window_base_cur +
+                                       hose->dma_window_size);
                }
        }
 #endif
@@ -227,6 +237,13 @@ static void __init mpc85xx_mds_setup_arch(void)
                iounmap(bcsr_regs);
        }
 #endif /* CONFIG_QUICC_ENGINE */
+
+#ifdef CONFIG_SWIOTLB
+       if (lmb_end_of_DRAM() > max) {
+               ppc_swiotlb_enable = 1;
+               set_pci_dma_ops(&swiotlb_pci_dma_ops);
+       }
+#endif
 }
 
 
@@ -281,6 +298,9 @@ static int __init mpc85xx_publish_devices(void)
 machine_device_initcall(mpc8568_mds, mpc85xx_publish_devices);
 machine_device_initcall(mpc8569_mds, mpc85xx_publish_devices);
 
+machine_arch_initcall(mpc8568_mds, swiotlb_setup_bus_notifier);
+machine_arch_initcall(mpc8569_mds, swiotlb_setup_bus_notifier);
+
 static void __init mpc85xx_mds_pic_init(void)
 {
        struct mpic *mpic;