firewire: replace get_features card driver hook

by feature variables in the fw_card struct.  The hook appeared to be an
unnecessary abstraction in the card driver interface.

Cleaner would be to pass those feature flags as arguments to
fw_card_initialize() or fw_card_add(), but the FairnessControl register
is in the SCLK domain and may therefore not be accessible while Link
Power Status is off, i.e. before the card->driver->enable call from
fw_card_add().
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/core-topology.c

@@ -543,8 +543,7 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation,
 
 	spin_lock_irqsave(&card->lock, flags);
 
-	card->broadcast_channel_allocated = (card->driver->get_features(card) &
-					     FEATURE_CHANNEL_31_ALLOCATED) != 0;
+	card->broadcast_channel_allocated = card->broadcast_channel_auto_allocated;
 	card->node_id = node_id;
 	/*
 	 * Update node_id before generation to prevent anybody from using

drivers/firewire/core-transaction.c

@@ -1129,8 +1129,7 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
 		break;
 
 	case CSR_PRIORITY_BUDGET:
-		if (!(card->driver->get_features(card) &
-						FEATURE_PRIORITY_BUDGET))
+		if (!card->priority_budget_implemented)
 			rcode = RCODE_ADDRESS_ERROR;
 		else if (tcode == TCODE_READ_QUADLET_REQUEST)
 			*data = cpu_to_be32(card->driver->

drivers/firewire/core.h

@@ -38,9 +38,6 @@ struct fw_packet;
 #define BROADCAST_CHANNEL_INITIAL	(1 << 31 | 31)
 #define BROADCAST_CHANNEL_VALID		(1 << 30)
 
-#define FEATURE_PRIORITY_BUDGET		0x01
-#define FEATURE_CHANNEL_31_ALLOCATED	0x02
-
 #define CSR_STATE_BIT_CMSTR	(1 << 8)
 #define CSR_STATE_BIT_ABDICATE	(1 << 10)
 
@@ -84,8 +81,6 @@ struct fw_card_driver {
 	u32 (*read_csr_reg)(struct fw_card *card, int csr_offset);
 	void (*write_csr_reg)(struct fw_card *card, int csr_offset, u32 value);
 
-	unsigned int (*get_features)(struct fw_card *card);
-
 	struct fw_iso_context *
 	(*allocate_iso_context)(struct fw_card *card,
 				int type, int channel, size_t header_size);

drivers/firewire/ohci.c

@@ -172,7 +172,6 @@ struct fw_ohci {
 	int request_generation;	/* for timestamping incoming requests */
 	unsigned quirks;
 	unsigned int pri_req_max;
-	unsigned int features;
 	u32 bus_time;
 	bool is_root;
 
@@ -1753,15 +1752,14 @@ static int ohci_enable(struct fw_card *card,
 	if (version >= OHCI_VERSION_1_1) {
 		reg_write(ohci, OHCI1394_InitialChannelsAvailableHi,
 			  0xfffffffe);
-		ohci->features |= FEATURE_CHANNEL_31_ALLOCATED;
+		card->broadcast_channel_auto_allocated = true;
 	}
 
 	/* Get implemented bits of the priority arbitration request counter. */
 	reg_write(ohci, OHCI1394_FairnessControl, 0x3f);
 	ohci->pri_req_max = reg_read(ohci, OHCI1394_FairnessControl) & 0x3f;
 	reg_write(ohci, OHCI1394_FairnessControl, 0);
-	if (ohci->pri_req_max != 0)
-		ohci->features |= FEATURE_PRIORITY_BUDGET;
+	card->priority_budget_implemented = ohci->pri_req_max != 0;
 
 	ar_context_run(&ohci->ar_request_ctx);
 	ar_context_run(&ohci->ar_response_ctx);
@@ -2132,13 +2130,6 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
 	}
 }
 
-static unsigned int ohci_get_features(struct fw_card *card)
-{
-	struct fw_ohci *ohci = fw_ohci(card);
-
-	return ohci->features;
-}
-
 static void copy_iso_headers(struct iso_context *ctx, void *p)
 {
 	int i = ctx->header_length;
@@ -2578,7 +2569,6 @@ static const struct fw_card_driver ohci_driver = {
 	.enable_phys_dma	= ohci_enable_phys_dma,
 	.read_csr_reg		= ohci_read_csr_reg,
 	.write_csr_reg		= ohci_write_csr_reg,
-	.get_features		= ohci_get_features,
 
 	.allocate_iso_context	= ohci_allocate_iso_context,
 	.free_iso_context	= ohci_free_iso_context,

include/linux/firewire.h

@@ -122,6 +122,9 @@ struct fw_card {
 	bool bm_abdicate; /* value of csr_abdicate before last bus reset */
 	bool csr_abdicate; /* visible in CSR STATE_CLEAR/SET registers */
 
+	bool priority_budget_implemented;	/* controller feature */
+	bool broadcast_channel_auto_allocated;	/* controller feature */
+
 	bool broadcast_channel_allocated;
 	u32 broadcast_channel;
 	__be32 topology_map[(CSR_TOPOLOGY_MAP_END - CSR_TOPOLOGY_MAP) / 4];