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Subject[PATCH 2.5] [2/6] EISA support updates
From
Date
Documentation update.

M.

diff -ruN linux-latest/Documentation/eisa.txt linux-eisa/Documentation/eisa.txt
--- linux-latest/Documentation/eisa.txt 2003-07-04 09:42:45.000000000 +0200
+++ linux-eisa/Documentation/eisa.txt 2003-07-04 09:44:46.000000000 +0200
@@ -46,12 +46,14 @@
to this device, as well as some parameters for probing purposes.

struct eisa_root_device {
- struct list_head node;
- struct device *dev; /* Pointer to bridge device */
- struct resource *res;
- unsigned long bus_base_addr;
- int slots; /* Max slot number */
- int bus_nr; /* Set by eisa_root_register */
+ struct device *dev; /* Pointer to bridge device */
+ struct resource *res;
+ unsigned long bus_base_addr;
+ int slots; /* Max slot number */
+ int force_probe; /* Probe even when no slot 0 */
+ u64 dma_mask; /* from bridge device */
+ int bus_nr; /* Set by eisa_root_register */
+ struct resource eisa_root_res; /* ditto */
};

node : used for eisa_root_register internal purpose
@@ -59,6 +61,8 @@
res : root device I/O resource
bus_base_addr : slot 0 address on this bus
slots : max slot number to probe
+force_probe : Probe even when slot 0 is empty (no EISA mainboard)
+dma_mask : Default DMA mask. Usualy the bridge device dma_mask.
bus_nr : unique bus id, set by eisa_root_register

** Driver :
@@ -87,7 +91,7 @@
Documentation/driver-model/driver.txt. Only .name,
.probe and .remove members are mandatory.

-An example is the 3c509 driver :
+An example is the 3c59x driver :

static struct eisa_device_id vortex_eisa_ids[] = {
{ "TCM5920", EISA_3C592_OFFSET },
@@ -116,15 +120,20 @@
struct eisa_device {
struct eisa_device_id id;
int slot;
- unsigned long base_addr;
- struct resource res;
+ int state;
+ unsigned long base_addr;
+ struct resource res[EISA_MAX_RESOURCES];
+ u64 dma_mask;
struct device dev; /* generic device */
};

id : EISA id, as read from device. id.driver_data is set from the
matching driver EISA id.
slot : slot number which the device was detected on
-res : I/O resource allocated to this device
+state : set of flags indicating the state of the device. Current
+ flags are EISA_CONFIG_ENABLED and EISA_CONFIG_FORCED.
+res : set of four 256 bytes I/O regions allocated to this device
+dma_mask: DMA mask set from the parent device.
dev : generic device (see Documentation/driver-model/device.txt)

You can get the 'struct eisa_device' from 'struct device' using the
@@ -140,6 +149,32 @@

Gets the pointer previously stored into the device's driver_data area.

+int eisa_get_region_index (void *addr);
+
+Returns the region number (0 <= x < EISA_MAX_RESOURCES) of a given
+address.
+
+** Kernel parameters :
+
+eisa_bus.enable_dev :
+
+A comma-separated list of slots to be enabled, even if the firmware
+set the card as disabled. The driver must be able to properly
+initialize the device in such conditions.
+
+eisa_bus.disable_dev :
+
+A comma-separated list of slots to be enabled, even if the firmware
+set the card as enabled. The driver won't be called to handle this
+device.
+
+virtual_root.force_probe :
+
+Force the probing code to probe EISA slots even when it cannot find an
+EISA compliant mainboard (nothing appears on slot 0). Defaultd to 0
+(don't force), and set to 1 (force probing) when either
+CONFIG_ALPHA_JENSEN or CONFIG_EISA_VLB_PRIMING are set.
+
** Random notes :

Converting an EISA driver to the new API mostly involves *deleting*
@@ -156,10 +191,13 @@
expect to have explored the whole machine when they exit their probe
routine.

+For example, switching your favorite EISA SCSI card to the "hotplug"
+model is "the right thing"(tm).
+
** Thanks :

I'd like to thank the following people for their help :
- Xavier Benigni for lending me a wonderful Alpha Jensen,
- James Bottomley, Jeff Garzik for getting this stuff into the kernel,
- Andries Brouwer for contributing numerous EISA ids,
-- Catrin Jones for coping with too many machines at home
+- Catrin Jones for coping with far too many machines at home.
--
Places change, faces change. Life is so very strange.
-
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