From f552470eec83d3587c603922404ea5115c6963a7 Mon Sep 17 00:00:00 2001
From: Till Straumann <strauman@slac.stanford.edu>
Date: Thu, 21 Jul 2011 23:24:54 +0000
Subject: 2011-07-21 Till Straumann <Till.Straumann@TU-Berlin.de>

	* if_em/e1000_osdep.h, if_em/e1000_osdep.c, if_em/if_em.c:
	added e1000_register()/e1000_unregister() to keep track of
	devices that are 'in-use'. This allows for sharing the low-level
	code between bsdnet and standalone drivers (e.g., for PtP
	GigE links).
---
 bsd_eth_drivers/if_em/e1000_osdep.c | 95 +++++++++++++++++++++++++++++++++----
 1 file changed, 85 insertions(+), 10 deletions(-)

(limited to 'bsd_eth_drivers/if_em/e1000_osdep.c')

diff --git a/bsd_eth_drivers/if_em/e1000_osdep.c b/bsd_eth_drivers/if_em/e1000_osdep.c
index 781e99d..eec749b 100644
--- a/bsd_eth_drivers/if_em/e1000_osdep.c
+++ b/bsd_eth_drivers/if_em/e1000_osdep.c
@@ -49,34 +49,57 @@ POSSIBILITY OF SUCH DAMAGE.
 #define  PCIR_COMMAND PCI_COMMAND
 #endif
 
+#define PCISIG_INVAL 0xffffffff
+
+#define PCISIG_MK(b,d,f) ( ((b)<<8) | (((d)&0x1f)<<3) | ((f)&7) )
+
+#define PCISIG_BUS(sig)  ( ((sig) >> 8) & 0xffffff )
+#define PCISIG_DEV(sig)  ( ((sig) >> 3) & 0x1f     )
+#define PCISIG_FUN(sig)  (  (sig)       & 0x07     )
+
+
+static uint32_t e1k_devs[]={
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL,
+	PCISIG_INVAL
+};
+
+#define N_E1K_DEVS (sizeof(e1k_devs)/sizeof(e1k_devs[0]))
+
 void
 e1000_write_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
 {
-struct e1000_pcisig *s = hw->back;
-	pci_write_config_word( s->bus, s->dev, s->fun, reg, *value );
+struct e1000_pcisig *s_p = hw->back;
+uint32_t             s   = s_p->sig;
+
+	pci_write_config_word( PCISIG_BUS(s), PCISIG_DEV(s), PCISIG_FUN(s), reg, *value );
 }
 
 void
 e1000_read_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
 {
-struct e1000_pcisig *s = hw->back;
-	pci_read_config_word( s->bus, s->dev, s->fun, reg, value );
+struct e1000_pcisig *s_p = hw->back;
+uint32_t             s   = s_p->sig;
+	pci_read_config_word( PCISIG_BUS(s), PCISIG_DEV(s), PCISIG_FUN(s), reg, value );
 }
 
 void
 e1000_pci_set_mwi(struct e1000_hw *hw)
 {
-struct e1000_pcisig *s = hw->back;
-	pci_write_config_word( s->bus, s->dev, s->fun, PCIR_COMMAND,
-	    (hw->bus.pci_cmd_word | CMD_MEM_WRT_INVALIDATE) );
+uint16_t v = (hw->bus.pci_cmd_word | CMD_MEM_WRT_INVALIDATE);
+	e1000_write_pci_cfg( hw, PCIR_COMMAND, &v );
 }
 
 void
 e1000_pci_clear_mwi(struct e1000_hw *hw)
 {
-struct e1000_pcisig *s = hw->back;
-	pci_write_config_word( s->bus, s->dev, s->fun, PCIR_COMMAND,
-	    (hw->bus.pci_cmd_word & ~CMD_MEM_WRT_INVALIDATE) );
+uint16_t v = (hw->bus.pci_cmd_word & ~CMD_MEM_WRT_INVALIDATE);
+	e1000_write_pci_cfg( hw, PCIR_COMMAND, &v );
 }
 
 /*
@@ -115,6 +138,7 @@ void
 e1000_free_dev_spec_struct(struct e1000_hw *hw)
 {
 	free ( hw->dev_spec );
+	hw->dev_spec = 0;
 }
 
 
@@ -156,3 +180,54 @@ struct timespec then, now;
 		rtems_task_wake_after( ticks );
 	}
 }
+
+int
+e1000_register(struct e1000_pcisig *s_p, unsigned b, unsigned d, unsigned f )
+{
+int      i,j,key;
+uint32_t sig = PCISIG_MK(b,d,f);
+
+	if ( PCISIG_INVAL == sig )
+		return -1;
+
+	j = -1;
+
+	rtems_interrupt_disable(key);
+	for ( i = 0; i<N_E1K_DEVS; i++ ) {
+		if ( PCISIG_INVAL == e1k_devs[i] ) {
+			j = i;
+		} else if ( sig == e1k_devs[i] ) {
+			j = -1;
+			break;
+		}
+	}
+	if ( j >= 0 ) {
+		e1k_devs[j] = sig;
+		if ( s_p )
+			s_p->sig = sig;
+	}
+	rtems_interrupt_enable(key);
+
+	return j < 0;
+}
+
+void
+e1000_unregister(struct e1000_pcisig *s_p)
+{
+int      i,key;
+uint32_t sig = s_p ? s_p->sig : PCISIG_INVAL;
+
+	if ( PCISIG_INVAL == sig )
+		return;
+
+	rtems_interrupt_disable(key);
+	for ( i = 0; i<N_E1K_DEVS; i++ ) {
+		if ( sig == e1k_devs[i] ) {
+			e1k_devs[i] = PCISIG_INVAL;
+			if ( s_p ) 
+				s_p->sig = PCISIG_INVAL;
+			break;
+		}
+	}
+	rtems_interrupt_enable(key);
+}
-- 
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