Commit 4ffb7a6a authored by Clemens Ladisch's avatar Clemens Ladisch
Browse files

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: default avatarClemens Ladisch <clemens@ladisch.de>
parent 3d1f46eb

drivers/firewire/core-transaction.c

+10 −2
Original line number Diff line number Diff line
@@ -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;

drivers/firewire/core.h

+2 −0
Original line number Diff line number Diff line
@@ -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.

drivers/firewire/ohci.c

+35 −0
Original line number Diff line number Diff line
@@ -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);

drivers/firewire/ohci.h

+1 −0
Original line number Diff line number Diff line
@@ -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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