[PATCH] chrp_pegasos_eth: Added Marvell Discovery II SRAM support

Add 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 <det.nicolas@free.fr>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 118 insertions, 6 deletions

diff --git a/arch/powerpc/platforms/chrp/pegasos_eth.c b/arch/powerpc/platforms/chrp/pegasos_eth.c
index cad5bfa153b2..a9052305c35d 100644
--- a/arch/powerpc/platforms/chrp/pegasos_eth.c
+++ b/arch/powerpc/platforms/chrp/pegasos_eth.c
@@ -17,7 +17,20 @@
 #include <linux/mv643xx.h>
 #include <linux/pci.h>
 
-/* Pegasos 2 specific Marvell MV 64361 gigabit ethernet port setup */
+#define PEGASOS2_MARVELL_REGBASE                (0xf1000000)
+#define PEGASOS2_MARVELL_REGSIZE                (0x00004000)
+#define PEGASOS2_SRAM_BASE                      (0xf2000000)
+#define PEGASOS2_SRAM_SIZE                      (256*1024)
+
+#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
+
 static struct resource mv643xx_eth_shared_resources[] = {
         [0] = {
                 .name   = "ethernet shared base",
@@ -44,7 +57,16 @@ static struct resource mv643xx_eth0_resources[] = {
         },
 };
 
-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_ETH0 + 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 +87,15 @@ static struct resource mv643xx_eth1_resources[] = {
         },
 };
 
-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,
@@ -83,9 +113,62 @@ static struct platform_device *mv643xx_eth_pd_devs[] __initdata = {
         &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;
+
+static int Enable_SRAM(void)
+{
+        u32 ALong;
+
+        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
+
+        MV_WRITE(MV64340_SRAM_CONFIG, 0);
 
-int
-mv643xx_eth_add_pds(void)
+        MV_WRITE(MV64340_INTEGRATED_SRAM_BASE_ADDR, PEGASOS2_SRAM_BASE >> 16);
+
+        MV_READ(MV64340_BASE_ADDR_ENABLE, ALong);
+        ALong &= ~(1 << 19);
+        MV_WRITE(MV64340_BASE_ADDR_ENABLE, ALong);
+
+        ALong = 0x02;
+        ALong |= PEGASOS2_SRAM_BASE & 0xffff0000;
+        MV_WRITE(MV643XX_ETH_BAR_4, ALong);
+
+        MV_WRITE(MV643XX_ETH_SIZE_REG_4, (PEGASOS2_SRAM_SIZE-1) & 0xffff0000);
+
+        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[] = {
@@ -93,9 +176,38 @@ mv643xx_eth_add_pds(void)
                 { }
         };
 
+#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));
+                ret = platform_add_devices(mv643xx_eth_pd_devs,
+                                ARRAY_SIZE(mv643xx_eth_pd_devs));
+
+                if ( Enable_SRAM() < 0)
+                {
+                        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);