fec_mxc: add MX25 support

Use RMII for MX25
Add code to init gasket that enables RMII

Signed-off-by: John Rigby <jcrigby@gmail.com>
CC: Ben Warren <biggerbadderben@gmail.com>

3 files changed, 61 insertions, 3 deletions

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index e027894..5af9cdb 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -367,6 +367,34 @@ static int fec_open(struct eth_device *edev)
 	 */
 	writel(readl(&fec->eth->ecntrl) | FEC_ECNTRL_ETHER_EN,
 		&fec->eth->ecntrl);
+#ifdef CONFIG_MX25
+	udelay(100);
+	/*
+	 * setup the MII gasket for RMII mode
+	 */
+
+	/* disable the gasket */
+	writew(0, &fec->eth->miigsk_enr);
+
+	/* wait for the gasket to be disabled */
+	while (readw(&fec->eth->miigsk_enr) & MIIGSK_ENR_READY)
+		udelay(2);
+
+	/* configure gasket for RMII, 50 MHz, no loopback, and no echo */
+	writew(MIIGSK_CFGR_IF_MODE_RMII, &fec->eth->miigsk_cfgr);
+
+	/* re-enable the gasket */
+	writew(MIIGSK_ENR_EN, &fec->eth->miigsk_enr);
+
+	/* wait until MII gasket is ready */
+	int max_loops = 10;
+	while ((readw(&fec->eth->miigsk_enr) & MIIGSK_ENR_READY) == 0) {
+		if (--max_loops <= 0) {
+			printf("WAIT for MII Gasket ready timed out\n");
+			break;
+		}
+	}
+#endif
 
 	miiphy_wait_aneg(edev);
 	miiphy_speed(edev->name, CONFIG_FEC_MXC_PHYADDR);
@@ -513,7 +541,8 @@ static void fec_halt(struct eth_device *dev)
 	 * Disable the Ethernet Controller
 	 * Note: this will also reset the BD index counter!
 	 */
-	writel(readl(&fec->eth->ecntrl) & ~FEC_ECNTRL_ETHER_EN, &fec->eth->ecntrl);
+	writel(readl(&fec->eth->ecntrl) & ~FEC_ECNTRL_ETHER_EN,
+			&fec->eth->ecntrl);
 	fec->rbd_index = 0;
 	fec->tbd_index = 0;
 	debug("eth_halt: done\n");
diff --git a/drivers/net/fec_mxc.h b/drivers/net/fec_mxc.h
index 6cb1bfc..5d0d69d 100644
--- a/drivers/net/fec_mxc.h
+++ b/drivers/net/fec_mxc.h
@@ -145,9 +145,17 @@ struct ethernet_regs {
 	uint32_t r_fdxfc;		/* MBAR_ETH + 0x2DC */
 	uint32_t ieee_r_octets_ok;	/* MBAR_ETH + 0x2E0 */
 
-	uint32_t res14[6];		/* MBAR_ETH + 0x2E4-2FC */
-
+	uint32_t res14[7];		/* MBAR_ETH + 0x2E4-2FC */
+
+#ifdef CONFIG_MX25
+	uint16_t miigsk_cfgr;		/* MBAR_ETH + 0x300 */
+	uint16_t res15[3];		/* MBAR_ETH + 0x302-306 */
+	uint16_t miigsk_enr;		/* MBAR_ETH + 0x308 */
+	uint16_t res16[3];		/* MBAR_ETH + 0x30a-30e */
+	uint32_t res17[60];		/* MBAR_ETH + 0x300-3FF */
+#else
 	uint32_t res15[64];		/* MBAR_ETH + 0x300-3FF */
+#endif
 };
 
 #define FEC_IEVENT_HBERR		0x80000000
@@ -196,6 +204,26 @@ struct ethernet_regs {
 #define FEC_ECNTRL_RESET		0x00000001	/* reset the FEC */
 #define FEC_ECNTRL_ETHER_EN		0x00000002	/* enable the FEC */
 
+#ifdef CONFIG_MX25
+/* defines for MIIGSK */
+/* RMII frequency control: 0=50MHz, 1=5MHz */
+#define MIIGSK_CFGR_FRCONT		(1 << 6)
+/* loopback mode */
+#define MIIGSK_CFGR_LBMODE		(1 << 4)
+/* echo mode */
+#define MIIGSK_CFGR_EMODE		(1 << 3)
+/* MII gasket mode field */
+#define MIIGSK_CFGR_IF_MODE_MASK	(3 << 0)
+/* MMI/7-Wire mode */
+#define MIIGSK_CFGR_IF_MODE_MII		(0 << 0)
+/* RMII mode */
+#define MIIGSK_CFGR_IF_MODE_RMII	(1 << 0)
+/* reflects MIIGSK Enable bit (RO) */
+#define MIIGSK_ENR_READY		(1 << 2)
+/* enable MIGSK (set by default) */
+#define MIIGSK_ENR_EN			(1 << 1)
+#endif
+
 /**
  * @brief Descriptor buffer alignment
  *
diff --git a/include/asm-arm/arch-mx25/clock.h b/include/asm-arm/arch-mx25/clock.h
index b0752e7..c59f588 100644
--- a/include/asm-arm/arch-mx25/clock.h
+++ b/include/asm-arm/arch-mx25/clock.h
@@ -30,6 +30,7 @@ ulong imx_get_perclk(int clk);
 ulong imx_get_ahbclk(void);
 
 #define imx_get_uartclk() imx_get_perclk(15)
+#define imx_get_fecclk() (imx_get_ahbclk()/2)
 
 
 #endif /* __ASM_ARCH_CLOCK_H */