Adds a disable_irm option to ieee1394.ko which disables all Isochronous
Resource Manager functionality, useful to work around certain problems,
e.g. iPod detection.
Signed-off-by: Jody McIntyre <scjody@modernduck.com>

drivers/ieee1394/ieee1394.h

@@ -77,6 +77,30 @@ extern const char *hpsb_speedto_str[];
 #define SELFID_PORT_NONE         0x0
 
 
+/* 1394a PHY bitmasks */
+#define PHY_00_PHYSICAL_ID       0xFC
+#define PHY_00_R                 0x02 /* Root */
+#define PHY_00_PS                0x01 /* Power Status*/
+#define PHY_01_RHB               0x80 /* Root Hold-Off */
+#define PHY_01_IBR               0x80 /* Initiate Bus Reset */
+#define PHY_01_GAP_COUNT         0x3F
+#define PHY_02_EXTENDED          0xE0 /* 0x7 for 1394a-compliant PHY */
+#define PHY_02_TOTAL_PORTS       0x1F
+#define PHY_03_MAX_SPEED         0xE0
+#define PHY_03_DELAY             0x0F
+#define PHY_04_LCTRL             0x80 /* Link Active Report Control */
+#define PHY_04_CONTENDER         0x40
+#define PHY_04_JITTER            0x38
+#define PHY_04_PWR_CLASS         0x07 /* Power Class */
+#define PHY_05_WATCHDOG          0x80
+#define PHY_05_ISBR              0x40 /* Initiate Short Bus Reset */
+#define PHY_05_LOOP              0x20 /* Loop Detect */
+#define PHY_05_PWR_FAIL          0x10 /* Cable Power Failure Detect */
+#define PHY_05_TIMEOUT           0x08 /* Arbitration State Machine Timeout */
+#define PHY_05_PORT_EVENT        0x04 /* Port Event Detect */
+#define PHY_05_ENAB_ACCEL        0x02 /* Enable Arbitration Acceleration */
+#define PHY_05_ENAB_MULTI        0x01 /* Ena. Multispeed Packet Concatenation */
+
 #include <asm/byteorder.h>
 
 #ifdef __BIG_ENDIAN_BITFIELD

drivers/ieee1394/ieee1394_core.c

@@ -56,6 +56,12 @@ static int disable_nodemgr = 0;
 module_param(disable_nodemgr, int, 0444);
 MODULE_PARM_DESC(disable_nodemgr, "Disable nodemgr functionality.");
 
+/* Disable Isochronous Resource Manager functionality */
+int hpsb_disable_irm = 0;
+module_param_named(disable_irm, hpsb_disable_irm, bool, 0);
+MODULE_PARM_DESC(disable_irm,
+		 "Disable Isochronous Resource Manager functionality.");
+
 /* We are GPL, so treat us special */
 MODULE_LICENSE("GPL");
 
@@ -1129,10 +1135,19 @@ static int __init ieee1394_init(void)
 	}
 
 	if (disable_nodemgr) {
-		HPSB_INFO("nodemgr functionality disabled");
+		HPSB_INFO("nodemgr and IRM functionality disabled");
+		/* We shouldn't contend for IRM with nodemgr disabled, since
+		   nodemgr implements functionality required of ieee1394a-2000
+		   IRMs */
+		hpsb_disable_irm = 1;
+                      
 		return 0;
 	}
 
+	if (hpsb_disable_irm) {
+		HPSB_INFO("IRM functionality disabled");
+	}
+
 	ret = init_ieee1394_nodemgr();
 	if (ret < 0) {
 		HPSB_INFO("init nodemgr failed");
@@ -1219,6 +1234,7 @@ EXPORT_SYMBOL(hpsb_selfid_received);
 EXPORT_SYMBOL(hpsb_selfid_complete);
 EXPORT_SYMBOL(hpsb_packet_sent);
 EXPORT_SYMBOL(hpsb_packet_received);
+EXPORT_SYMBOL_GPL(hpsb_disable_irm);
 
 /** ieee1394_transactions.c **/
 EXPORT_SYMBOL(hpsb_get_tlabel);

drivers/ieee1394/ieee1394_core.h

@@ -218,6 +218,7 @@ static inline unsigned char ieee1394_file_to_instance(struct file *file)
 	return file->f_dentry->d_inode->i_cindex;
 }
 
+extern int hpsb_disable_irm;
 
 /* Our sysfs bus entry */
 extern struct bus_type ieee1394_bus_type;

drivers/ieee1394/nodemgr.c

@@ -23,6 +23,7 @@
 
 #include "ieee1394_types.h"
 #include "ieee1394.h"
+#include "ieee1394_core.h"
 #include "hosts.h"
 #include "ieee1394_transactions.h"
 #include "highlevel.h"
@@ -1464,7 +1465,7 @@ static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
 	quadlet_t bc;
 	int status;
 
-	if (host->is_irm)
+	if (hpsb_disable_irm || host->is_irm)
 		return 1;
 
 	status = hpsb_read(host, LOCAL_BUS | (host->irm_id),

drivers/ieee1394/ohci1394.c

@@ -482,7 +482,9 @@ static void ohci_initialize(struct ti_ohci *ohci)
 
 	/* Put some defaults to these undefined bus options */
 	buf = reg_read(ohci, OHCI1394_BusOptions);
-	buf |=  0xE0000000; /* Enable IRMC, CMC and ISC */
+	buf |=  0x60000000; /* Enable CMC and ISC */
+	if (!hpsb_disable_irm)
+		buf |=  0x80000000; /* Enable IRMC */
 	buf &= ~0x00ff0000; /* XXX: Set cyc_clk_acc to zero for now */
 	buf &= ~0x18000000; /* Disable PMC and BMC */
 	reg_write(ohci, OHCI1394_BusOptions, buf);
@@ -497,10 +499,12 @@ static void ohci_initialize(struct ti_ohci *ohci)
 	reg_write(ohci, OHCI1394_LinkControlClear, 0xffffffff);
 
 	/* Enable cycle timer and cycle master and set the IRM
-	 * contender bit in our self ID packets. */
-	reg_write(ohci, OHCI1394_LinkControlSet, OHCI1394_LinkControl_CycleTimerEnable |
+	 * contender bit in our self ID packets if appropriate. */
+	reg_write(ohci, OHCI1394_LinkControlSet,
+		  OHCI1394_LinkControl_CycleTimerEnable |
 		  OHCI1394_LinkControl_CycleMaster);
-	set_phy_reg_mask(ohci, 4, 0xc0);
+	set_phy_reg_mask(ohci, 4, PHY_04_LCTRL |
+			 (hpsb_disable_irm ? 0 : PHY_04_CONTENDER));
 
 	/* Set up self-id dma buffer */
 	reg_write(ohci, OHCI1394_SelfIDBuffer, ohci->selfid_buf_bus);

drivers/ieee1394/pcilynx.c

@@ -384,6 +384,7 @@ static quadlet_t generate_own_selfid(struct ti_lynx *lynx,
         lsid = 0x80400000 | ((phyreg[0] & 0xfc) << 22);
         lsid |= (phyreg[1] & 0x3f) << 16; /* gap count */
         lsid |= (phyreg[2] & 0xc0) << 8; /* max speed */
+	if (!hpsb_disable_irm)
 		lsid |= (phyreg[6] & 0x01) << 11; /* contender (phy dependent) */
         /* lsid |= 1 << 11; *//* set contender (hack) */
         lsid |= (phyreg[6] & 0x10) >> 3; /* initiated reset */
@@ -1780,20 +1781,26 @@ static int __devinit add_card(struct pci_dev *dev,
                   | LINK_CONTROL_RESET_TX    | LINK_CONTROL_RESET_RX);
 
 	if (!lynx->phyic.reg_1394a) {
-                /* attempt to enable contender bit -FIXME- would this work
-                 * elsewhere? */
+		if (!hpsb_disable_irm) {
+			/* attempt to enable contender bit -FIXME- would this
+			 * work elsewhere? */
 			reg_set_bits(lynx, GPIO_CTRL_A, 0x1);
 			reg_write(lynx, GPIO_DATA_BASE + 0x3c, 0x1);
+		}
 	} else {
-                /* set the contender and LCtrl bit in the extended PHY register
-                 * set. (Should check that bis 0,1,2 (=0xE0) is set
-                 * in register 2?)
+		/* set the contender (if appropriate) and LCtrl bit in the
+		 * extended PHY register set. (Should check that PHY_02_EXTENDED
+		 * is set in register 2?)
 		 */
 		i = get_phy_reg(lynx, 4);
-                if (i != -1) set_phy_reg(lynx, 4, i | 0xc0);
+		i |= PHY_04_LCTRL;
+		if (hpsb_disable_irm)
+			i &= !PHY_04_CONTENDER;
+		else
+			i |= PHY_04_CONTENDER;
+		if (i != -1) set_phy_reg(lynx, 4, i);
 	}
 	
-
         if (!skip_eeprom)
         {
                 i2c_adapter = bit_ops;