From 506f1a31932747f56a5029d5b3c14b1b68f41ccc Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Thu, 10 Jun 2010 08:25:19 +0200 Subject: [PATCH] firewire: add CSR NODE_IDS support The NODE_IDS register, and especially its bus_id field, is quite useless because 1394.1 requires that the bus_id field always stays 0x3ff. However, the 1394 specification requires this register on all transaction capable nodes, and the Base 1394 Test Suite tests for it, so we better implement it. Signed-off-by: Clemens Ladisch --- drivers/firewire/core-transaction.c | 11 +++++++++++ drivers/firewire/core.h | 1 + drivers/firewire/ohci.c | 20 ++++++++++++++++++++ 3 files changed, 32 insertions(+) diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c index a4d8109edec..16ffa27d23b 100644 --- a/drivers/firewire/core-transaction.c +++ b/drivers/firewire/core-transaction.c @@ -1023,6 +1023,17 @@ static void handle_registers(struct fw_card *card, struct fw_request *request, } break; + case CSR_NODE_IDS: + if (tcode == TCODE_READ_QUADLET_REQUEST) + *data = cpu_to_be32(card->driver-> + read_csr_reg(card, CSR_NODE_IDS)); + else if (tcode == TCODE_WRITE_QUADLET_REQUEST) + card->driver->write_csr_reg(card, CSR_NODE_IDS, + be32_to_cpu(*data)); + else + rcode = RCODE_TYPE_ERROR; + break; + case CSR_CYCLE_TIME: if (TCODE_IS_READ_REQUEST(tcode) && length == 4) *data = cpu_to_be32(card->driver-> diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index c19e9873e43..efcdeb2e31e 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -76,6 +76,7 @@ struct fw_card_driver { int node_id, int generation); u32 (*read_csr_reg)(struct fw_card *card, int csr_offset); + void (*write_csr_reg)(struct fw_card *card, int csr_offset, u32 value); struct fw_iso_context * (*allocate_iso_context)(struct fw_card *card, diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index a8093a9a3fc..a55fbbce9e7 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -1974,6 +1974,9 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset) struct fw_ohci *ohci = fw_ohci(card); switch (csr_offset) { + case CSR_NODE_IDS: + return reg_read(ohci, OHCI1394_NodeID) << 16; + case CSR_CYCLE_TIME: return get_cycle_time(ohci); @@ -1983,6 +1986,22 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset) } } +static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value) +{ + struct fw_ohci *ohci = fw_ohci(card); + + switch (csr_offset) { + case CSR_NODE_IDS: + reg_write(ohci, OHCI1394_NodeID, value >> 16); + flush_writes(ohci); + break; + + default: + WARN_ON(1); + break; + } +} + static void copy_iso_headers(struct iso_context *ctx, void *p) { int i = ctx->header_length; @@ -2421,6 +2440,7 @@ static const struct fw_card_driver ohci_driver = { .cancel_packet = ohci_cancel_packet, .enable_phys_dma = ohci_enable_phys_dma, .read_csr_reg = ohci_read_csr_reg, + .write_csr_reg = ohci_write_csr_reg, .allocate_iso_context = ohci_allocate_iso_context, .free_iso_context = ohci_free_iso_context, -- 2.20.1