Subject: [PATCH 2.6.14-rc3 1/1] chrp_pegasos_eth: Added Marvell Discovery II SRAM support

From: Nicolas DET <[email-masked]>
Date: Thu, 13 Oct 2005 22:00:24 +0200

Added proper entry to support the Marvell MV64361 (Marvell Discovery II)
SRAM.

This feature may be used by the mv643xx_eth driver.

Signed-off-by: Nicolas DET <[email-masked])

diff -ur a/arch/ppc/platforms/chrp_pegasos_eth.c b/arch/ppc/platforms/chrp_pegasos_eth.c
--- a/arch/ppc/platforms/chrp_pegasos_eth.c	2005-10-13 21:19:46.590643250 +0200
+++ b/arch/ppc/platforms/chrp_pegasos_eth.c	2005-10-13 21:29:54.976665000 +0200
@@ -17,6 +17,21 @@
 #include <linux/mv643xx.h>
 #include <linux/pci.h>
 
+// Pegasos II location and size for the SRAM stuff
+// Only used for the ethernet driver ATM
+#define PEGASOS2_MARVELL_REGBASE 		(0xf1000000)
+#define PEGASOS2_MARVELL_REGSIZE 		(0x00004000)
+#define PEGASOS2_SRAM_BASE 			(0xf2000000)
+#define PEGASOS2_SRAM_SIZE			(0x00040000)
+
+#define PEGASOS2_SRAM_BASE_ETH0			(PEGASOS2_SRAM_BASE)
+#define PEGASOS2_SRAM_BASE_ETH1			(PEGASOS2_SRAM_BASE_ETH0 + (PEGASOS2_SRAM_SIZE / 2) )
+
+#define PEGASOS2_SRAM_RXRING_SIZE		(PEGASOS2_SRAM_SIZE/4)
+#define PEGASOS2_SRAM_TXRING_SIZE		(PEGASOS2_SRAM_SIZE/4)
+
+#undef BE_VERBOSE
+
 /* Pegasos 2 specific Marvell MV 64361 gigabit ethernet port setup */
 static struct resource mv643xx_eth_shared_resources[] = {
 	[0] = {
@@ -44,7 +59,15 @@
 	},
 };
 
-static struct mv643xx_eth_platform_data eth0_pd;
+static struct mv643xx_eth_platform_data eth0_pd = {
+	.tx_sram_addr = PEGASOS2_SRAM_BASE_ETH0,
+	.tx_sram_size = PEGASOS2_SRAM_TXRING_SIZE,
+	.tx_queue_size = PEGASOS2_SRAM_TXRING_SIZE/16,
+
+	.rx_sram_addr = PEGASOS2_SRAM_BASE + PEGASOS2_SRAM_TXRING_SIZE,
+	.rx_sram_size = PEGASOS2_SRAM_RXRING_SIZE,
+	.rx_queue_size = PEGASOS2_SRAM_RXRING_SIZE/16,
+};
 
 static struct platform_device eth0_device = {
 	.name		= MV643XX_ETH_NAME,
@@ -65,7 +88,15 @@
 	},
 };
 
-static struct mv643xx_eth_platform_data eth1_pd;
+static struct mv643xx_eth_platform_data eth1_pd = {
+	.tx_sram_addr = PEGASOS2_SRAM_BASE_ETH1,
+	.tx_sram_size = PEGASOS2_SRAM_TXRING_SIZE,
+	.tx_queue_size = PEGASOS2_SRAM_TXRING_SIZE/16,
+	
+	.rx_sram_addr = PEGASOS2_SRAM_BASE_ETH1 + PEGASOS2_SRAM_TXRING_SIZE,
+	.rx_sram_size = PEGASOS2_SRAM_RXRING_SIZE,
+	.rx_queue_size = PEGASOS2_SRAM_RXRING_SIZE/16,
+};
 
 static struct platform_device eth1_device = {
 	.name		= MV643XX_ETH_NAME,
@@ -83,19 +114,111 @@
 	&eth1_device,
 };
 
+/***********/
+/***********/
+#define MV_READ(offset,val) 	{ val = readl(mv643xx_reg_base + offset); }
+#define MV_WRITE(offset,data) writel(data, mv643xx_reg_base + offset)
+
+static void __iomem *mv643xx_reg_base = NULL;
 
-int
-mv643xx_eth_add_pds(void)
+
+static int Enable_SRAM(void)
+{
+	u32 ALong;
+	
+	// Let's io remap the mv register to touch the SRAM config
+	if (mv643xx_reg_base == NULL)
+		mv643xx_reg_base = ioremap(PEGASOS2_MARVELL_REGBASE, PEGASOS2_MARVELL_REGSIZE);
+
+	if (mv643xx_reg_base == NULL)
+	return -ENOMEM;
+
+#ifdef BE_VERBOSE
+	printk("Pegasos II/Marvell MV64361: register remapped from %p to %p\n", (void *)PEGASOS2_MARVELL_REGBASE, (void *)mv643xx_reg_base);
+#endif
+
+	// First the SRAM config register
+	// We set it to 0 ATM -> No cache coherency, no parity check
+	MV_WRITE(MV64340_SRAM_CONFIG, 0);
+
+	// set the SRAM address on the CPU side
+	MV_WRITE(MV64340_INTEGRATED_SRAM_BASE_ADDR, PEGASOS2_SRAM_BASE >> 16);
+
+	// Now enable it (CPU side)
+	MV_READ(MV64340_BASE_ADDR_ENABLE, ALong);
+	ALong &= ~(1 << 19);
+	MV_WRITE(MV64340_BASE_ADDR_ENABLE, ALong);
+
+	// And now to the GB side on WB 4 (0->3) can be use for DRAM stuff
+	ALong = 0x02; // Integrated SRAM value
+	ALong |= PEGASOS2_SRAM_BASE & 0xffff0000; // Finally set the SRAM adress in the uppter par of the register
+	MV_WRITE(MV643XX_ETH_BAR_4, ALong);
+
+	// and the size ...
+	MV_WRITE(MV643XX_ETH_SIZE_REG_4, PEGASOS2_SRAM_SIZE & 0xffff0000);
+
+	// Finaly enable the window
+	MV_READ(MV643XX_ETH_BASE_ADDR_ENABLE_REG, ALong);
+	ALong &= ~(1 << 4);
+	MV_WRITE(MV643XX_ETH_BASE_ADDR_ENABLE_REG, ALong);
+
+#ifdef BE_VERBOSE
+	printk("Pegasos II/Marvell MV64361: register unmapped\n");
+	printk("Pegasos II/Marvell MV64361: SRAM at %p, size=%x\n", (void*) PEGASOS2_SRAM_BASE, PEGASOS2_SRAM_SIZE);
+#endif
+
+	iounmap(mv643xx_reg_base);
+	mv643xx_reg_base = NULL;
+
+	return 1;
+}
+
+
+/***********/
+/***********/
+int mv643xx_eth_add_pds(void)
 {
 	int ret = 0;
-	static struct pci_device_id pci_marvell_mv64360[] = {
+	static struct pci_device_id pci_marvell_mv64360[] =
+	{
 		{ PCI_DEVICE(PCI_VENDOR_ID_MARVELL, PCI_DEVICE_ID_MARVELL_MV64360) },
 		{ }
 	};
 
-	if (pci_dev_present(pci_marvell_mv64360)) {
+#ifdef BE_VERBOSE
+	printk("Pegasos II/Marvell MV64361: init\n");
+#endif
+
+	if (pci_dev_present(pci_marvell_mv64360))
+	{
 		ret = platform_add_devices(mv643xx_eth_pd_devs, ARRAY_SIZE(mv643xx_eth_pd_devs));
+		
+		if ( Enable_SRAM() < 0)
+		{
+			// Humm, disable SRAM stuff
+			eth0_pd.tx_sram_addr = 0;
+			eth0_pd.tx_sram_size = 0;
+			eth0_pd.rx_sram_addr = 0;
+			eth0_pd.rx_sram_size = 0;
+			
+			eth1_pd.tx_sram_addr = 0;
+			eth1_pd.tx_sram_size = 0;
+			eth1_pd.rx_sram_addr = 0;
+			eth1_pd.rx_sram_size = 0;
+			
+#ifdef BE_VERBOSE
+			printk("Pegasos II/Marvell MV64361: Can't enable the SRAM\n");
+#endif
+		}	
 	}
+	
+#ifdef BE_VERBOSE
+		
+	printk("Pegasos II/Marvell MV64361: init is over\n");
+#endif
+	
 	return ret;
 }
+
 device_initcall(mv643xx_eth_add_pds);
+