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Date: Thu, 10 Mar 2011 10:10:41 +0000
From: Jamie Iles <jamie@...ieiles.com>
To: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: nicolas.ferre@...el.com, Jamie Iles <jamie@...ieiles.com>
Subject: [PATCH 6/8] macb: support higher rate GEM MDIO clock divisors
GEM devices support larger clock divisors and have a different
range of divisors. Program the MDIO clock divisors based on the
device type.
Signed-off-by: Jamie Iles <jamie@...ieiles.com>
---
drivers/net/macb.c | 49 ++++++++++++++++++++++++++++++++++++++++---------
drivers/net/macb.h | 11 +++++++++++
2 files changed, 51 insertions(+), 9 deletions(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 2541e3b..dbc6e7ea 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -801,7 +801,8 @@ static void macb_init_hw(struct macb *bp)
macb_reset_hw(bp);
__macb_set_hwaddr(bp);
- config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
+ config = bp->is_gem ? macb_readl(bp, NCFGR) & GEM_BF(CLK, -1L) :
+ macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
config |= MACB_BIT(PAE); /* PAuse Enable */
config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
config |= MACB_BIT(BIG); /* Receive oversized frames */
@@ -1118,6 +1119,42 @@ static const struct net_device_ops macb_netdev_ops = {
#define PCLK_NAME "pclk"
#endif
+static u32 macb_mdc_clk_div(unsigned long pclk_hz)
+{
+ u32 config;
+
+ if (pclk_hz <= 20000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV8);
+ else if (pclk_hz <= 40000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV16);
+ else if (pclk_hz <= 80000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV32);
+ else
+ config = MACB_BF(CLK, MACB_CLK_DIV64);
+
+ return config;
+}
+
+static u32 gem_mdc_clk_div(unsigned long pclk_hz)
+{
+ u32 config;
+
+ if (pclk_hz <= 20000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV8);
+ else if (pclk_hz <= 40000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV16);
+ else if (pclk_hz <= 80000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV32);
+ else if (pclk_hz <= 120000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV48);
+ else if (pclk_hz <= 160000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV64);
+ else
+ config = GEM_BF(CLK, GEM_CLK_DIV96);
+
+ return config;
+}
+
static int __macb_probe(struct platform_device *pdev, int is_gem)
{
struct resource *regs;
@@ -1202,14 +1239,8 @@ static int __macb_probe(struct platform_device *pdev, int is_gem)
/* Set MII management clock divider */
pclk_hz = clk_get_rate(bp->pclk);
- if (pclk_hz <= 20000000)
- config = MACB_BF(CLK, MACB_CLK_DIV8);
- else if (pclk_hz <= 40000000)
- config = MACB_BF(CLK, MACB_CLK_DIV16);
- else if (pclk_hz <= 80000000)
- config = MACB_BF(CLK, MACB_CLK_DIV32);
- else
- config = MACB_BF(CLK, MACB_CLK_DIV64);
+ config = bp->is_gem ? gem_mdc_clk_div(pclk_hz) :
+ macb_mdc_clk_div(pclk_hz);
macb_writel(bp, NCFGR, config);
macb_get_hwaddr(bp);
diff --git a/drivers/net/macb.h b/drivers/net/macb.h
index 6248af6..4cd1e41 100644
--- a/drivers/net/macb.h
+++ b/drivers/net/macb.h
@@ -130,6 +130,9 @@
#define MACB_IRXFCS_OFFSET 19
#define MACB_IRXFCS_SIZE 1
+/* GEM specific NCFGR bitfields. */
+#define GEM_CLK_OFFSET 18
+#define GEM_CLK_SIZE 3
/* Bitfields in NSR */
#define MACB_NSR_LINK_OFFSET 0
#define MACB_NSR_LINK_SIZE 1
@@ -238,6 +241,14 @@
#define MACB_CLK_DIV32 2
#define MACB_CLK_DIV64 3
+/* GEM specific constants for CLK. */
+#define GEM_CLK_DIV8 0
+#define GEM_CLK_DIV16 1
+#define GEM_CLK_DIV32 2
+#define GEM_CLK_DIV48 3
+#define GEM_CLK_DIV64 4
+#define GEM_CLK_DIV96 5
+
/* Constants for MAN register */
#define MACB_MAN_SOF 1
#define MACB_MAN_WRITE 1
--
1.7.4
--
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