[PATCH 16/31] powerpc: Add DMA ops support for of_plaform_device to Cell
flat view
STALE7293d
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2006-11-07 07:22:48
Subsystem:
the rest · Maintainer:
Linus Torvalds
This patch adds a bus device notifier to the of_platform bus type on cell to setup the DMA operations for of_platform_devices. We currently use the PCI operations as Cell use a special version of them that happens to be suitable for our needs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> arch/powerpc/platforms/cell/setup.c | 45 +++++++++++++++++++++++++++++++++--- 1 file changed, 42 insertions(+), 3 deletions(-) Index: linux-cell/arch/powerpc/platforms/cell/setup.c ===================================================================
--- linux-cell.orig/arch/powerpc/platforms/cell/setup.c 2006-10-26 16:42:30.000000000 +1000
+++ linux-cell/arch/powerpc/platforms/cell/setup.c 2006-10-26 16:45:00.000000000 +1000@@ -30,6 +30,7 @@ #include <linux/console.h> #include <linux/mutex.h> #include <linux/memory_hotplug.h> +#include <linux/notifier.h> #include <asm/mmu.h> #include <asm/processor.h>
@@ -82,10 +83,49 @@ static void cell_progress(char *s, unsig printk("*** %04x : %s\n", hex, s ? s : ""); } +static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct device *dev = data; + struct device_ext *dext; + + if (action != BUS_NOTIFY_ADD_DEVICE) + return 0; + + dext = device_get_ext(dev); + if (dext == NULL) { + dev_printk(KERN_ERR, dev, + "OF platform device with extension !\n"); + return 0; + } + + /* For now, we just use the PCI DMA ops for everything, though + * we'll need something better when we have a real iommu + * implementation. + */ + dext->dma_ops = pci_dma_ops; + + return 0; +} + +static struct notifier_block cell_of_bus_notifier = { + .notifier_call = cell_of_bus_notify +}; + + static int __init cell_publish_devices(void) { - if (machine_is(cell)) - of_platform_bus_probe(NULL, NULL, NULL); + if (!machine_is(cell)) + return 0; + + /* Register callbacks on OF platform device addition/removal + * to handle linking them to the right DMA operations + */ + register_bus_notifier(&of_platform_bus_type, &cell_of_bus_notifier); + + /* Publish OF platform devices for southbridge IOs */ + of_platform_bus_probe(NULL, NULL, NULL); + return 0; } device_initcall(cell_publish_devices);
@@ -154,7 +194,6 @@ static void __init cell_setup_arch(void) #ifdef CONFIG_SMP smp_init_cell(); #endif - /* init to some ~sane value until calibrate_delay() runs */ loops_per_jiffy = 50000000;