From 4ffb7a6a066e4be4577976d1c08e237c7479770a Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@ladisch.de>
Date: Thu, 10 Jun 2010 08:36:37 +0200
Subject: [PATCH] firewire: add CSR cmstr support
Implement the cmstr bit, which is required for cycle master capable
nodes and tested for by the Base 1394 Test Suite.
This bit allows the bus master to disable cycle start packets; there are
bus master implementations that actually do this.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---
drivers/firewire/core-transaction.c | 12 ++++++++--
drivers/firewire/core.h | 2 ++
drivers/firewire/ohci.c | 35 +++++++++++++++++++++++++++++
drivers/firewire/ohci.h | 1 +
4 files changed, 48 insertions(+), 2 deletions(-)
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index dd8ef650a7cb..e0c6cce894cf 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -1003,7 +1003,12 @@ static u32 read_state_register(struct fw_card *card)
* reset, but then cleared when the units are ready again, which
* happens immediately for us.
*/
- return 0;
+ u32 value = 0x0000;
+
+ /* Bit 8 (cmstr): */
+ value |= card->driver->read_csr_reg(card, CSR_STATE_CLEAR);
+
+ return value;
}
static void update_split_timeout(struct fw_card *card)
@@ -1034,6 +1039,8 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
if (tcode == TCODE_READ_QUADLET_REQUEST) {
*data = cpu_to_be32(read_state_register(card));
} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
+ card->driver->write_csr_reg(card, CSR_STATE_CLEAR,
+ be32_to_cpu(*data));
} else {
rcode = RCODE_TYPE_ERROR;
}
@@ -1043,7 +1050,8 @@ static void handle_registers(struct fw_card *card, struct fw_request *request,
if (tcode == TCODE_READ_QUADLET_REQUEST) {
*data = cpu_to_be32(read_state_register(card));
} else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
- /* FIXME: implement cmstr */
+ card->driver->write_csr_reg(card, CSR_STATE_SET,
+ be32_to_cpu(*data));
/* FIXME: implement abdicate */
} else {
rcode = RCODE_TYPE_ERROR;
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 3b8c0f042f49..aaecdd1c1767 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -40,6 +40,8 @@ struct fw_packet;
#define FEATURE_PRIORITY_BUDGET 0x01
+#define CSR_STATE_BIT_CMSTR (1 << 8)
+
struct fw_card_driver {
/*
* Enable the given card with the given initial config rom.
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 0e5413531785..1dcc2e427eb1 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -172,6 +172,7 @@ struct fw_ohci {
unsigned quirks;
unsigned int pri_req_max;
u32 bus_time;
+ bool is_root;
/*
* Spinlock for accessing fw_ohci data. Never call out of
@@ -1400,6 +1401,7 @@ static void bus_reset_tasklet(unsigned long data)
unsigned long flags;
void *free_rom = NULL;
dma_addr_t free_rom_bus = 0;
+ bool is_new_root;
reg = reg_read(ohci, OHCI1394_NodeID);
if (!(reg & OHCI1394_NodeID_idValid)) {
@@ -1413,6 +1415,12 @@ static void bus_reset_tasklet(unsigned long data)
ohci->node_id = reg & (OHCI1394_NodeID_busNumber |
OHCI1394_NodeID_nodeNumber);
+ is_new_root = (reg & OHCI1394_NodeID_root) != 0;
+ if (!(ohci->is_root && is_new_root))
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ OHCI1394_LinkControl_cycleMaster);
+ ohci->is_root = is_new_root;
+
reg = reg_read(ohci, OHCI1394_SelfIDCount);
if (reg & OHCI1394_SelfIDCount_selfIDError) {
fw_notify("inconsistent self IDs\n");
@@ -2013,6 +2021,16 @@ static u32 ohci_read_csr_reg(struct fw_card *card, int csr_offset)
u32 value;
switch (csr_offset) {
+ case CSR_STATE_CLEAR:
+ case CSR_STATE_SET:
+ /* the controller driver handles only the cmstr bit */
+ if (ohci->is_root &&
+ (reg_read(ohci, OHCI1394_LinkControlSet) &
+ OHCI1394_LinkControl_cycleMaster))
+ return CSR_STATE_BIT_CMSTR;
+ else
+ return 0;
+
case CSR_NODE_IDS:
return reg_read(ohci, OHCI1394_NodeID) << 16;
@@ -2050,6 +2068,23 @@ static void ohci_write_csr_reg(struct fw_card *card, int csr_offset, u32 value)
unsigned long flags;
switch (csr_offset) {
+ case CSR_STATE_CLEAR:
+ /* the controller driver handles only the cmstr bit */
+ if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
+ reg_write(ohci, OHCI1394_LinkControlClear,
+ OHCI1394_LinkControl_cycleMaster);
+ flush_writes(ohci);
+ }
+ break;
+
+ case CSR_STATE_SET:
+ if ((value & CSR_STATE_BIT_CMSTR) && ohci->is_root) {
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ OHCI1394_LinkControl_cycleMaster);
+ flush_writes(ohci);
+ }
+ break;
+
case CSR_NODE_IDS:
reg_write(ohci, OHCI1394_NodeID, value >> 16);
flush_writes(ohci);
diff --git a/drivers/firewire/ohci.h b/drivers/firewire/ohci.h
index 3bc9a5d744eb..0e6c5a466908 100644
--- a/drivers/firewire/ohci.h
+++ b/drivers/firewire/ohci.h
@@ -60,6 +60,7 @@
#define OHCI1394_LinkControl_cycleSource (1 << 22)
#define OHCI1394_NodeID 0x0E8
#define OHCI1394_NodeID_idValid 0x80000000
+#define OHCI1394_NodeID_root 0x40000000
#define OHCI1394_NodeID_nodeNumber 0x0000003f
#define OHCI1394_NodeID_busNumber 0x0000ffc0
#define OHCI1394_PhyControl 0x0EC
--
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