Support for Adder875 in Linux 2.4

Support for Adder875 in Linux 2.4

[Markus Westergren]

Hi,

I'm working on a project which will use hardware based on Analogue & Micro
Adder875 module together with Linux 2.4.

I use RedBoot as bootloader and kernel 2.4.27-pre1, both came with the Adder
module.

The project require:

 - dual ethernet support with AM79C874 PHY
   The driver I've found (fec.c) only supports one ethernet. I'v started
	modifying a newer version of this driver which have support for my PHY. I
	have made some progress but it's not working yet. Found out that the first
	FEC is used to communicate with both PHY's. Both devices are detected
	correctly and the first seems to work but the second hangs the kernel when
	the first packet is sent or received.
 - SPI support
   Have found a simple driver (cpm_spi.c), which I have not tested yet.
 - PCMCIA support
   Will try to modify the m8xx_pcmcia driver.

Not required but would be good to have:
 - USB host support
   Have no clue where to start looking.

Have anyone used this module together with Linux and are there working drivers
for it? Any tips/ideas?

Thanks

/Markus

------------------
Markus Westergren
Biologigrand 17
S-907 32 Umea
SWEDEN

Re: Support for Adder875 in Linux 2.4

[Yuli Barcohen]

>>>>> Markus Westergren writes:

    Markus> Hi, I'm working on a project which will use hardware based
    Markus> on Analogue & Micro Adder875 module together with Linux 2.4.

    Markus> I use RedBoot as bootloader and kernel 2.4.27-pre1, both
    Markus> came with the Adder module.

    Markus> The project require:

    Markus> - dual ethernet support with AM79C874 PHY
    Markus>    The driver I've found (fec.c) only supports one
    Markus>    ethernet. I'v started
    Markus> 	modifying a newer version of this driver which have
    Markus> 	support for my PHY. I have made some progress but it's
    Markus> 	not working yet. Found out that the first FEC is used to
    Markus> 	communicate with both PHY's. Both devices are detected
    Markus> 	correctly and the first seems to work but the second
    Markus> 	hangs the kernel when the first packet is sent or
    Markus> 	received.
    Markus> - SPI support
    Markus>    Have found a simple driver (cpm_spi.c), which I have not
    Markus>    tested yet.
    Markus> - PCMCIA support
    Markus>    Will try to modify the m8xx_pcmcia driver.

    Markus> Not required but would be good to have:
    Markus> - USB host support
    Markus>    Have no clue where to start looking.

    Markus> Have anyone used this module together with Linux and are
    Markus> there working drivers for it? Any tips/ideas?

Arabella Linux supports all these. Not sure how you are going to use
PCMCIA on this specific board - it's not connected.

-- 
========================================================================
 Yuli Barcohen       | Phone +972-9-765-1788 |  Software Project Leader
 yuli@arabellasw.com | Fax   +972-9-765-7494 | Arabella Software, Israel
========================================================================

Re: Support for Adder875 in Linux 2.4

[Jan Damborsky]

Markus Westergren wrote:

>Hi,
>
>I'm working on a project which will use hardware based on Analogue & Micro
>Adder875 module together with Linux 2.4.
>
>I use RedBoot as bootloader and kernel 2.4.27-pre1, both came with the Adder
>module.
>
>The project require:
>
> - dual ethernet support with AM79C874 PHY
>   The driver I've found (fec.c) only supports one ethernet. I'v started
>	modifying a newer version of this driver which have support for my PHY. I
>	have made some progress but it's not working yet. Found out that the first
>	FEC is used to communicate with both PHY's. Both devices are detected
>	correctly and the first seems to work but the second hangs the kernel when
>	the first packet is sent or received.
>  
>
We use our proprietary board with MPC880, dual ethernet + Am79C874 PHY.
Kernel 2.4.25  (linuxppc_2_4_devel checked out from www.denx.de). Original
source tree supports only one FEC, but with minor ugly hack we utilize 
both MPC880 FECs
without problem. If interested, I can send you a patch for get 2nd FEC 
working.

Re: Support for Adder875 in Linux 2.4

[Markus Westergren]

On Mon, 14 Feb 2005, Yuli Barcohen wrote:

> >>>>> Markus Westergren writes:
>
>     Markus> Hi, I'm working on a project which will use hardware based
>     Markus> on Analogue & Micro Adder875 module together with Linux 2.4.
>
>     Markus> I use RedBoot as bootloader and kernel 2.4.27-pre1, both
>     Markus> came with the Adder module.
>
>     Markus> The project require:
>
>     Markus> - dual ethernet support with AM79C874 PHY
>     Markus>    The driver I've found (fec.c) only supports one
>     Markus>    ethernet. I'v started
>     Markus> 	modifying a newer version of this driver which have
>     Markus> 	support for my PHY. I have made some progress but it's
>     Markus> 	not working yet. Found out that the first FEC is used to
>     Markus> 	communicate with both PHY's. Both devices are detected
>     Markus> 	correctly and the first seems to work but the second
>     Markus> 	hangs the kernel when the first packet is sent or
>     Markus> 	received.
>     Markus> - SPI support
>     Markus>    Have found a simple driver (cpm_spi.c), which I have not
>     Markus>    tested yet.
>     Markus> - PCMCIA support
>     Markus>    Will try to modify the m8xx_pcmcia driver.
>
>     Markus> Not required but would be good to have:
>     Markus> - USB host support
>     Markus>    Have no clue where to start looking.
>
>     Markus> Have anyone used this module together with Linux and are
>     Markus> there working drivers for it? Any tips/ideas?
>
> Arabella Linux supports all these. Not sure how you are going to use
> PCMCIA on this specific board - it's not connected.
>
The board in my project is almost like a Adder875 but unlike the Adder it has a
PCMCIA slot connected.

I have tested a version of Arabella (FREE v2.1, kernel 2.4.25). It looks like
that the fec driver only supports general PHY and no link interrupts.

/Markus

Re: Support for Adder875 in Linux 2.4

[Markus Westergren]

On Mon, 14 Feb 2005, Jan Damborsky wrote:

> Markus Westergren wrote:
>
> >Hi,
> >
> >I'm working on a project which will use hardware based on Analogue & Micro
> >Adder875 module together with Linux 2.4.
> >
> >I use RedBoot as bootloader and kernel 2.4.27-pre1, both came with the Adder
> >module.
> >
> >The project require:
> >
> > - dual ethernet support with AM79C874 PHY
> >   The driver I've found (fec.c) only supports one ethernet. I'v started
> >	modifying a newer version of this driver which have support for my PHY. I
> >	have made some progress but it's not working yet. Found out that the first
> >	FEC is used to communicate with both PHY's. Both devices are detected
> >	correctly and the first seems to work but the second hangs the kernel when
> >	the first packet is sent or received.
> >
> >
> We use our proprietary board with MPC880, dual ethernet + Am79C874 PHY.
> Kernel 2.4.25  (linuxppc_2_4_devel checked out from www.denx.de). Original
> source tree supports only one FEC, but with minor ugly hack we utilize
> both MPC880 FECs
> without problem. If interested, I can send you a patch for get 2nd FEC
> working.
>
I got my board working with both ethernet ports today. I'm interested in your
patch so that I can see if we made the same ugly hack and if I have overlocked
something :)

/Markus

(no subject)

[Yuli Barcohen]

>>>>> Markus Westergren writes:

    Markus> The board in my project is almost like a Adder875 but unlike
    Markus> the Adder it has a PCMCIA slot connected.

No problems, it's supported

    Markus> I have tested a version of Arabella (FREE v2.1, kernel
    Markus> 2.4.25). It looks like that the fec driver only supports
    Markus> general PHY and no link interrupts.

Yes, because nobody of our customers needed PHY-specific support. It's
trivial to add if necessary.

-- 
========================================================================
 Yuli Barcohen       | Phone +972-9-765-1788 |  Software Project Leader
 yuli@arabellasw.com | Fax   +972-9-765-7494 | Arabella Software, Israel
========================================================================

Re: Support for Adder875 in Linux 2.4

[Jan Damborsky]

[-- Attachment #1: Type: text/plain, Size: 411 bytes --]

Markus Westergren wrote:

>I got my board working with both ethernet ports today. I'm interested in your
>patch so that I can see if we made the same ugly hack and if I have overlocked
>something :)
>
>/Markus
>  
>
The patch is here. I am sorry it has not been done against current denk 
source tree,
I used  the one from 19th January. But I hope it might satisfy for 
understanding the way
the hack is done.


[-- Attachment #2: fec.diff --]
[-- Type: text/plain, Size: 8434 bytes --]

diff -purN linuxppc_2_4_devel-org/arch/ppc/8xx_io/fec.c linuxppc_2_4_devel-new/arch/ppc/8xx_io/fec.c
--- linuxppc_2_4_devel-org/arch/ppc/8xx_io/fec.c	2004-08-02 17:34:43.000000000 +0200
+++ linuxppc_2_4_devel-new/arch/ppc/8xx_io/fec.c	2005-02-15 21:36:09.000000000 +0100
@@ -181,6 +181,7 @@ typedef struct {
  * the buffer descriptor determines the actual condition.
  */
 struct fec_enet_private {
+    int irq_num;
 	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
 	struct	sk_buff* tx_skbuff[TX_RING_SIZE];
 	ushort	skb_cur;
@@ -232,6 +233,10 @@ struct fec_enet_private {
 #endif
 };
 
+/* Initialize the FEC Ethernet on 860T and 2nd FEC on Duet.
+ */
+static int __init fec_enet_low_init(int ch);
+
 static int fec_enet_open(struct net_device *dev);
 static int fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev);
 #ifdef	CONFIG_USE_MDIO
@@ -250,7 +255,6 @@ static struct net_device_stats *fec_enet
 static void set_multicast_list(struct net_device *dev);
 static void fec_restart(struct net_device *dev, int duplex);
 static void fec_stop(struct net_device *dev);
-static	ushort	my_enet_addr[3];
 
 #ifdef	CONFIG_USE_MDIO
 static int fec_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
@@ -2018,7 +2022,7 @@ static void set_multicast_list(struct ne
 	volatile fec_t *ep;
 
 	fep = (struct fec_enet_private *)dev->priv;
-	ep = &(((immap_t *)IMAP_ADDR)->im_cpm.cp_fec);
+    ep = (volatile fec_t *)dev->base_addr;
 
 	if (dev->flags&IFF_PROMISC) {
 
@@ -2128,14 +2132,31 @@ static void set_multicast_list(struct ne
 	}
 }
 
-/* Initialize the FEC Ethernet on 860T.
- */
 int __init fec_enet_init(void)
 {
+#ifdef CONFIG_FEC2_ENET
+    int ret;
+
+    if ((ret = fec_enet_low_init(0)) < 0)
+        return(ret);
+
+    return(fec_enet_low_init(1));
+#else
+    return(fec_enet_low_init(0));
+#endif
+} /* end of fec_enet_init() */
+
+/* Initialize the FEC Ethernet on 860T and 2nd FEC on Duet.
+ */
+static int __init
+fec_enet_low_init(
+    int ch)
+{
 	struct net_device *dev;
 	struct fec_enet_private *fep;
 	int i, j, k;
-	unsigned char	*eap, *iap, *ba;
+
+	unsigned char	*iap, *ba;
 	dma_addr_t	mem_addr;
 	volatile	cbd_t	*bdp;
 	cbd_t		*cbd_base;
@@ -2162,7 +2183,10 @@ int __init fec_enet_init(void)
 	*/
 	dev = init_etherdev(0, 0);
 
+    if (ch == 0)
 	fecp = &(immap->im_cpm.cp_fec);
+    else
+	fecp = &(immap->im_cpm.cp_fec2);
 
 	/* Whack a reset.  We should wait for this.
 	*/
@@ -2179,7 +2203,7 @@ int __init fec_enet_init(void)
 	/* Set the Ethernet address.  If using multiple Enets on the 8xx,
 	 * this needs some work to get unique addresses.
 	 */
-	eap = (unsigned char *)my_enet_addr;
+
 	iap = bd->bi_enetaddr;
 
 #ifdef CONFIG_SCC_ENET
@@ -2201,12 +2225,15 @@ int __init fec_enet_init(void)
 	tmpaddr[3] |= 0x80;
 # endif
 	iap = tmpaddr;
-#endif
+#endif /* CONFIG_SCC_ENET */
 
 	for (i=0; i<6; i++) {
-		dev->dev_addr[i] = *eap++ = *iap++;
+		dev->dev_addr[i] = *iap++;
 	}
 
+    if (ch == 1)
+        dev->dev_addr[3] ^= 0x01;
+
 	/* Allocate memory for buffer descriptors.
 	*/
 	if (((RX_RING_SIZE + TX_RING_SIZE) * sizeof(cbd_t)) > PAGE_SIZE) {
@@ -2258,8 +2285,15 @@ int __init fec_enet_init(void)
 	fep->ph_priv = NULL;
 #endif
 	/* Install our interrupt handler. */
+    if (ch == 0) {
+        fep->irq_num = FEC_INTERRUPT;
 	if (request_irq(FEC_INTERRUPT, fec_enet_interrupt, 0, "fec", dev) != 0)
 		panic("Could not allocate FEC IRQ!");
+    } else {
+        fep->irq_num = FEC2_INTERRUPT;
+	if (request_irq(FEC2_INTERRUPT, fec_enet_interrupt, 0, "fec2", dev) != 0)
+		panic("Could not allocate FEC2 IRQ!");
+    }
 
 	dev->base_addr = (unsigned long)fecp;
 	dev->priv = fep;
@@ -2316,6 +2350,33 @@ int __init fec_enet_init(void)
 	mii_free = mii_cmds;
 #endif	/* CONFIG_USE_MDIO */
 
+/* MPC87x/88x have got 2 FECs and different pinout */
+#if defined(CONFIG_TS3_DUET)
+    if (ch == 0) {
+	immap->im_ioport.iop_papar |=  0xf830;
+	immap->im_ioport.iop_padir |=  0x0830;
+	immap->im_ioport.iop_padir &= ~0xf000;
+
+	immap->im_cpm.cp_pbpar     |=  0x00001001;
+	immap->im_cpm.cp_pbdir     &= ~0x00001001;
+
+	immap->im_ioport.iop_pcpar |=  0x000c;
+	immap->im_ioport.iop_pcdir &= ~0x000c;
+
+	immap->im_cpm.cp_pepar     |=  0x00000003;
+	immap->im_cpm.cp_pedir     |=  0x00000003;
+	immap->im_cpm.cp_peso      &= ~0x00000003;
+
+	immap->im_cpm.cp_cptr      &= ~0x00000100;
+    } else {
+        immap->im_cpm.cp_pepar     |= 0x0003fffc;
+        immap->im_cpm.cp_pedir     |= 0x0003fffc;
+        immap->im_cpm.cp_peso      &= ~0x000087fc;
+        immap->im_cpm.cp_peso      |= 0x00037800;
+
+        immap->im_cpm.cp_cptr      &= ~0x00000080;
+    } /*endif*/
+#else
 #ifndef CONFIG_ICU862
 	/* Configure all of port D for MII.
 	*/
@@ -2355,6 +2416,7 @@ int __init fec_enet_init(void)
 		immap->im_ioport.iop_pddir = 0x1c58;	/* Pre rev. D */
 	else
 		immap->im_ioport.iop_pddir = 0x1fff;	/* Rev. D and later */
+#endif /* CONFIG_TS3_DUET */
 
 #ifdef	CONFIG_USE_MDIO
 	/* Set MII speed to 2.5 MHz
@@ -2373,7 +2435,10 @@ int __init fec_enet_init(void)
 		", MII irq %d"
 #endif
 		", addr ",
-		dev->name, FEC_INTERRUPT
+
+		dev->name, 
+                fep->irq_num
+
 #ifdef PHY_INTERRUPT
 		, PHY_INTERRUPT
 #endif
@@ -2411,12 +2476,9 @@ fec_restart(struct net_device *dev, int 
 	struct fec_enet_private *fep;
 	int i;
 	volatile	cbd_t	*bdp;
-	volatile	immap_t	*immap;
 	volatile	fec_t	*fecp;
 
-	immap = (immap_t *)IMAP_ADDR;	/* pointer to internal registers */
-
-	fecp = &(immap->im_cpm.cp_fec);
+    fecp = (volatile fec_t *)dev->base_addr;
 
 	fep = dev->priv;
 
@@ -2439,8 +2501,9 @@ fec_restart(struct net_device *dev, int 
 
 	/* Set station address.
 	*/
-	fecp->fec_addr_low  = (my_enet_addr[0] << 16) | my_enet_addr[1];
-	fecp->fec_addr_high =  my_enet_addr[2];
+	fecp->fec_addr_low  = (dev->dev_addr[0] << 24) | (dev->dev_addr[1] << 16)
+     | (dev->dev_addr[2] << 8) | (dev->dev_addr[3] << 0);
+	fecp->fec_addr_high =  (dev->dev_addr[4] << 8) | dev->dev_addr[5];
 
 	/* Reset all multicast.
 	*/
@@ -2531,7 +2594,7 @@ fec_restart(struct net_device *dev, int 
 	*/
 	fecp->fec_ievent = 0xffc0;
 
-	fecp->fec_ivec = (FEC_INTERRUPT/2) << 29;
+    fecp->fec_ivec = (fep->irq_num/2) << 29;
 
 	/* Enable interrupts we wish to service.
 	*/
@@ -2552,21 +2615,17 @@ fec_restart(struct net_device *dev, int 
 static void
 fec_stop(struct net_device *dev)
 {
-	volatile	immap_t	*immap;
 	volatile	fec_t	*fecp;
 	struct fec_enet_private *fep;
 	int i;
 
-	immap = (immap_t *)IMAP_ADDR;	/* pointer to internal registers */
-
-	fecp = &(immap->im_cpm.cp_fec);
+    fecp = (volatile fec_t *)dev->base_addr;
 
 	if ((fecp->fec_ecntrl & FEC_ECNTRL_ETHER_EN) == 0)
 		return;	/* already down */
 
 	fep = dev->priv;
 
-
 	fecp->fec_x_cntrl = 0x01;	/* Graceful transmit stop */
 
 	for (i = 0;
@@ -2584,7 +2643,8 @@ fec_stop(struct net_device *dev)
 
 	/* Enable MII command finished interrupt
 	*/
-	fecp->fec_ivec = (FEC_INTERRUPT/2) << 29;
+    fecp->fec_ivec = (fep->irq_num/2) << 29;
+
 	fecp->fec_imask = FEC_ENET_MII;
 
 #ifdef	CONFIG_USE_MDIO
diff -purN linuxppc_2_4_devel-org/include/asm-ppc/8xx_immap.h linuxppc_2_4_devel-new/include/asm-ppc/8xx_immap.h
--- linuxppc_2_4_devel-org/include/asm-ppc/8xx_immap.h	2004-08-02 17:40:47.000000000 +0200
+++ linuxppc_2_4_devel-new/include/asm-ppc/8xx_immap.h	2005-02-15 21:09:22.000000000 +0100
@@ -9,6 +9,7 @@
  * a combination that I found difficult to separate into logical
  * functional files.....but anyone else is welcome to try.  -- Dan
  */
+
 #ifdef __KERNEL__
 #ifndef __IMMAP_8XX__
 #define __IMMAP_8XX__
@@ -426,8 +427,21 @@ typedef struct comm_proc {
 	uint	cp_pbpar;
 	char	res12[2];
 	ushort	cp_pbodr;
-	uint	cp_pbdat;
-	char	res13[0x18];
+        uint	cp_pbdat;
+
+	/* 
+	 * Port E - MPC87x/88x only.
+	 */
+	uint	cp_pedir;
+	uint	cp_pepar;
+	uint	cp_peso;
+	uint	cp_peodr;
+	uint	cp_pedat;
+
+	/* Communications Processor Timing Register -
+	   Contains RMII Timing for the FECs on MPC87x/88x only.
+	*/
+	uint	cp_cptr;
 
 	/* Serial Interface and Time Slot Assignment.
 	*/
@@ -454,7 +468,12 @@ typedef struct comm_proc {
 	union	fec_lcd fl_un;
 #define cp_fec	fl_un.fl_un_fec
 #define lcd_cmap fl_un.fl_un_cmap
-	char	res18[0x1000];
+
+	char	res18[0xE00];
+
+	/* The DUET family has a second FEC here */
+	fec_t	cp_fec2;
+#define cp_fec1	cp_fec	/* consistency macro */
 
 	/* Dual Ported RAM follows.
 	 * There are many different formats for this memory area

Re: Support for Adder875 in Linux 2.4

[Markus Westergren]

On Wed, 16 Feb 2005, Jan Damborsky wrote:

> Markus Westergren wrote:
>
> >I got my board working with both ethernet ports today. I'm interested in your
> >patch so that I can see if we made the same ugly hack and if I have overlocked
> >something :)
> >
> >/Markus
> >
> >
> The patch is here. I am sorry it has not been done against current denk
> source tree,
> I used  the one from 19th January. But I hope it might satisfy for
> understanding the way
> the hack is done.
>
>
Thank you.

/Markus

Re: Support for Adder875 in Linux 2.4

[Jan Damborsky]

Markus Westergren wrote:

>On Wed, 16 Feb 2005, Jan Damborsky wrote:
>
>  
>
>>Markus Westergren wrote:
>>
>>    
>>
>>>I got my board working with both ethernet ports today. I'm interested in your
>>>patch so that I can see if we made the same ugly hack and if I have overlocked
>>>something :)
>>>
>>>/Markus
>>>
>>>
>>>      
>>>
>>The patch is here. I am sorry it has not been done against current denk
>>source tree,
>>I used  the one from 19th January. But I hope it might satisfy for
>>understanding the way
>>the hack is done.
>>
>>
>>    
>>
>Thank you.
>  
>
You're welcome :)
Please, let me now, if you made the FEC modification in the similar way.
If not, please let me see your patch for later inspiration.