mv643xx_eth: mbus decode window support

Make it possible to pass mbus_dram_target_info to the mv643xx_eth
driver via the platform data, and make the mv643xx_eth driver
program the window registers based on this data if it is passed in.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Reviewed-by: Tzachi Perelstein <tzachi@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>

2 files changed, 57 insertions, 0 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index eebf0d288e36..aabf1c60946d 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -91,6 +91,11 @@
  */
 #define PHY_ADDR_REG                            0x0000
 #define SMI_REG                                 0x0004
+#define WINDOW_BASE(i)                          (0x0200 + ((i) << 3))
+#define WINDOW_SIZE(i)                          (0x0204 + ((i) << 3))
+#define WINDOW_REMAP_HIGH(i)                    (0x0280 + ((i) << 2))
+#define WINDOW_BAR_ENABLE                       0x0290
+#define WINDOW_PROTECT(i)                       (0x0294 + ((i) << 4))
 
 /*
  * Per-port registers.
@@ -512,6 +517,8 @@ struct mv643xx_shared_private {
 
         /* used to protect SMI_REG, which is shared across ports */
         spinlock_t phy_lock;
+
+        u32 win_protect;
 };
 
 struct mv643xx_private {
@@ -1888,6 +1895,9 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
         mp->shared = platform_get_drvdata(pd->shared);
         port_num = mp->port_num = pd->port_number;
 
+        if (mp->shared->win_protect)
+                wrl(mp, WINDOW_PROTECT(port_num), mp->shared->win_protect);
+
         /* set default config values */
         eth_port_uc_addr_get(mp, dev->dev_addr);
         mp->rx_ring_size = PORT_DEFAULT_RECEIVE_QUEUE_SIZE;
@@ -1992,9 +2002,44 @@ static int mv643xx_eth_remove(struct platform_device *pdev)
         return 0;
 }
 
+static void mv643xx_eth_conf_mbus_windows(struct mv643xx_shared_private *msp,
+                                          struct mbus_dram_target_info *dram)
+{
+        void __iomem *base = msp->eth_base;
+        u32 win_enable;
+        u32 win_protect;
+        int i;
+
+        for (i = 0; i < 6; i++) {
+                writel(0, base + WINDOW_BASE(i));
+                writel(0, base + WINDOW_SIZE(i));
+                if (i < 4)
+                        writel(0, base + WINDOW_REMAP_HIGH(i));
+        }
+
+        win_enable = 0x3f;
+        win_protect = 0;
+
+        for (i = 0; i < dram->num_cs; i++) {
+                struct mbus_dram_window *cs = dram->cs + i;
+
+                writel((cs->base & 0xffff0000) |
+                        (cs->mbus_attr << 8) |
+                        dram->mbus_dram_target_id, base + WINDOW_BASE(i));
+                writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i));
+
+                win_enable &= ~(1 << i);
+                win_protect |= 3 << (2 * i);
+        }
+
+        writel(win_enable, base + WINDOW_BAR_ENABLE);
+        msp->win_protect = win_protect;
+}
+
 static int mv643xx_eth_shared_probe(struct platform_device *pdev)
 {
         static int mv643xx_version_printed = 0;
+        struct mv643xx_eth_shared_platform_data *pd = pdev->dev.platform_data;
         struct mv643xx_shared_private *msp;
         struct resource *res;
         int ret;
@@ -2021,6 +2066,12 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, msp);
 
+        /*
+         * (Re-)program MBUS remapping windows if we are asked to.
+         */
+        if (pd != NULL && pd->dram != NULL)
+                mv643xx_eth_conf_mbus_windows(msp, pd->dram);
+
         return 0;
 
 out_free:
diff --git a/include/linux/mv643xx_eth.h b/include/linux/mv643xx_eth.h
index 2d59855b61c1..4801b02b444e 100644
--- a/include/linux/mv643xx_eth.h
+++ b/include/linux/mv643xx_eth.h
@@ -5,6 +5,8 @@
 #ifndef __LINUX_MV643XX_ETH_H
 #define __LINUX_MV643XX_ETH_H
 
+#include <linux/mbus.h>
+
 #define MV643XX_ETH_SHARED_NAME         "mv643xx_eth_shared"
 #define MV643XX_ETH_NAME                "mv643xx_eth"
 #define MV643XX_ETH_SHARED_REGS         0x2000
@@ -13,6 +15,10 @@
 #define MV643XX_ETH_SIZE_REG_4          0x2224
 #define MV643XX_ETH_BASE_ADDR_ENABLE_REG        0x2290
 
+struct mv643xx_eth_shared_platform_data {
+        struct mbus_dram_target_info    *dram;
+};
+
 struct mv643xx_eth_platform_data {
         struct platform_device  *shared;
         int             port_number;