ARM: Orion: Eth: Add clk/clkdev support.

The t_clk is moved from the shared part of the ethernet driver into
the per port section. Each port can have its own gated clock, which it
needs to enable/disable, as oppossed to there being one clock shared
by all ports. In practice, only kirkwood supports this at the moment.
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

arch/arm/mach-dove/common.c

@@ -102,8 +102,7 @@ void __init dove_ehci1_init(void)
 void __init dove_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data,
-			DOVE_GE00_PHYS_BASE, IRQ_DOVE_GE00_SUM,
-			0, get_tclk());
+			DOVE_GE00_PHYS_BASE, IRQ_DOVE_GE00_SUM, 0);
 }
 
 /*****************************************************************************

arch/arm/mach-kirkwood/common.c

@@ -86,14 +86,14 @@ static struct clk __init *kirkwood_register_gate(const char *name, u8 bit_idx)
 
 void __init kirkwood_clk_init(void)
 {
-	struct clk *runit;
+	struct clk *runit, *ge0, *ge1;
 
 	tclk = clk_register_fixed_rate(NULL, "tclk", NULL,
 				       CLK_IS_ROOT, kirkwood_tclk);
 
 	runit = kirkwood_register_gate("runit",  CGC_BIT_RUNIT);
-	kirkwood_register_gate("ge0",    CGC_BIT_GE0);
-	kirkwood_register_gate("ge1",    CGC_BIT_GE1);
+	ge0 = kirkwood_register_gate("ge0",    CGC_BIT_GE0);
+	ge1 = kirkwood_register_gate("ge1",    CGC_BIT_GE1);
 	kirkwood_register_gate("sata0",  CGC_BIT_SATA0);
 	kirkwood_register_gate("sata1",  CGC_BIT_SATA1);
 	kirkwood_register_gate("usb0",   CGC_BIT_USB0);
@@ -110,6 +110,8 @@ void __init kirkwood_clk_init(void)
 	/* clkdev entries, mapping clks to devices */
 	orion_clkdev_add(NULL, "orion_spi.0", runit);
 	orion_clkdev_add(NULL, "orion_spi.1", runit);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".0", ge0);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".1", ge1);
 }
 
 /*****************************************************************************
@@ -131,7 +133,7 @@ void __init kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge00_init(eth_data,
 			GE00_PHYS_BASE, IRQ_KIRKWOOD_GE00_SUM,
-			IRQ_KIRKWOOD_GE00_ERR, kirkwood_tclk);
+			IRQ_KIRKWOOD_GE00_ERR);
 }
 
 
@@ -145,7 +147,7 @@ void __init kirkwood_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge01_init(eth_data,
 			GE01_PHYS_BASE, IRQ_KIRKWOOD_GE01_SUM,
-			IRQ_KIRKWOOD_GE01_ERR, kirkwood_tclk);
+			IRQ_KIRKWOOD_GE01_ERR);
 }
 
 

arch/arm/mach-mv78xx0/common.c

@@ -213,7 +213,7 @@ void __init mv78xx0_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data,
 			GE00_PHYS_BASE, IRQ_MV78XX0_GE00_SUM,
-			IRQ_MV78XX0_GE_ERR, get_tclk());
+			IRQ_MV78XX0_GE_ERR);
 }
 
 
@@ -224,7 +224,7 @@ void __init mv78xx0_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge01_init(eth_data,
 			GE01_PHYS_BASE, IRQ_MV78XX0_GE01_SUM,
-			NO_IRQ, get_tclk());
+			NO_IRQ);
 }
 
 
@@ -248,7 +248,7 @@ void __init mv78xx0_ge10_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge10_init(eth_data,
 			GE10_PHYS_BASE, IRQ_MV78XX0_GE10_SUM,
-			NO_IRQ, get_tclk());
+			NO_IRQ);
 }
 
 
@@ -272,7 +272,7 @@ void __init mv78xx0_ge11_init(struct mv643xx_eth_platform_data *eth_data)
 
 	orion_ge11_init(eth_data,
 			GE11_PHYS_BASE, IRQ_MV78XX0_GE11_SUM,
-			NO_IRQ, get_tclk());
+			NO_IRQ);
 }
 
 /*****************************************************************************

arch/arm/mach-orion5x/common.c

@@ -109,7 +109,7 @@ void __init orion5x_eth_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data,
 			ORION5X_ETH_PHYS_BASE, IRQ_ORION5X_ETH_SUM,
-			IRQ_ORION5X_ETH_ERR, orion5x_tclk);
+			IRQ_ORION5X_ETH_ERR);
 }
 
 

arch/arm/plat-orion/common.c

@@ -43,6 +43,10 @@ void __init orion_clkdev_init(struct clk *tclk)
 {
 	orion_clkdev_add(NULL, "orion_spi.0", tclk);
 	orion_clkdev_add(NULL, "orion_spi.1", tclk);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".0", tclk);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".1", tclk);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".2", tclk);
+	orion_clkdev_add(NULL, MV643XX_ETH_NAME ".3", tclk);
 }
 
 /* Fill in the resources structure and link it into the platform
@@ -225,13 +229,11 @@ void __init orion_rtc_init(unsigned long mapbase,
  ****************************************************************************/
 static __init void ge_complete(
 	struct mv643xx_eth_shared_platform_data *orion_ge_shared_data,
-	int tclk,
 	struct resource *orion_ge_resource, unsigned long irq,
 	struct platform_device *orion_ge_shared,
 	struct mv643xx_eth_platform_data *eth_data,
 	struct platform_device *orion_ge)
 {
-	orion_ge_shared_data->t_clk = tclk;
 	orion_ge_resource->start = irq;
 	orion_ge_resource->end = irq;
 	eth_data->shared = orion_ge_shared;
@@ -282,12 +284,11 @@ static struct platform_device orion_ge00 = {
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk)
+			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge00_shared, orion_ge00_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
-	ge_complete(&orion_ge00_shared_data, tclk,
+	ge_complete(&orion_ge00_shared_data,
 		    orion_ge00_resources, irq, &orion_ge00_shared,
 		    eth_data, &orion_ge00);
 }
@@ -335,12 +336,11 @@ static struct platform_device orion_ge01 = {
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk)
+			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge01_shared, orion_ge01_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
-	ge_complete(&orion_ge01_shared_data, tclk,
+	ge_complete(&orion_ge01_shared_data,
 		    orion_ge01_resources, irq, &orion_ge01_shared,
 		    eth_data, &orion_ge01);
 }
@@ -388,12 +388,11 @@ static struct platform_device orion_ge10 = {
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk)
+			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge10_shared, orion_ge10_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
-	ge_complete(&orion_ge10_shared_data, tclk,
+	ge_complete(&orion_ge10_shared_data,
 		    orion_ge10_resources, irq, &orion_ge10_shared,
 		    eth_data, &orion_ge10);
 }
@@ -441,12 +440,11 @@ static struct platform_device orion_ge11 = {
 void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk)
+			    unsigned long irq_err)
 {
 	fill_resources(&orion_ge11_shared, orion_ge11_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
-	ge_complete(&orion_ge11_shared_data, tclk,
+	ge_complete(&orion_ge11_shared_data,
 		    orion_ge11_resources, irq, &orion_ge11_shared,
 		    eth_data, &orion_ge11);
 }

arch/arm/plat-orion/include/plat/common.h

@@ -39,29 +39,26 @@ void __init orion_rtc_init(unsigned long mapbase,
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk);
+			    unsigned long irq_err);
 
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk);
+			    unsigned long irq_err);
 
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk);
+			    unsigned long irq_err);
 
 void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err,
-			    int tclk);
+			    unsigned long irq_err);
 
 void __init orion_ge00_switch_init(struct dsa_platform_data *d,
 				   int irq);
+
 void __init orion_i2c_init(unsigned long mapbase,
 			   unsigned long irq,
 			   unsigned long freq_m);

drivers/net/ethernet/marvell/mv643xx_eth.c

@@ -57,6 +57,7 @@
 #include <linux/types.h>
 #include <linux/inet_lro.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 
 static char mv643xx_eth_driver_name[] = "mv643xx_eth";
 static char mv643xx_eth_driver_version[] = "1.4";
@@ -289,10 +290,10 @@ struct mv643xx_eth_shared_private {
 	/*
 	 * Hardware-specific parameters.
 	 */
-	unsigned int t_clk;
 	int extended_rx_coal_limit;
 	int tx_bw_control;
 	int tx_csum_limit;
+
 };
 
 #define TX_BW_CONTROL_ABSENT		0
@@ -431,6 +432,12 @@ struct mv643xx_eth_private {
 	int tx_desc_sram_size;
 	int txq_count;
 	struct tx_queue txq[8];
+
+	/*
+	 * Hardware-specific parameters.
+	 */
+	struct clk *clk;
+	unsigned int t_clk;
 };
 
 
@@ -1010,7 +1017,7 @@ static void tx_set_rate(struct mv643xx_eth_private *mp, int rate, int burst)
 	int mtu;
 	int bucket_size;
 
-	token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+	token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
 	if (token_rate > 1023)
 		token_rate = 1023;
 
@@ -1042,7 +1049,7 @@ static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
 	int token_rate;
 	int bucket_size;
 
-	token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+	token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
 	if (token_rate > 1023)
 		token_rate = 1023;
 
@@ -1309,7 +1316,7 @@ static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
 		temp = (val & 0x003fff00) >> 8;
 
 	temp *= 64000000;
-	do_div(temp, mp->shared->t_clk);
+	do_div(temp, mp->t_clk);
 
 	return (unsigned int)temp;
 }
@@ -1319,7 +1326,7 @@ static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
 	u64 temp;
 	u32 val;
 
-	temp = (u64)usec * mp->shared->t_clk;
+	temp = (u64)usec * mp->t_clk;
 	temp += 31999999;
 	do_div(temp, 64000000);
 
@@ -1345,7 +1352,7 @@ static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
 
 	temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
 	temp *= 64000000;
-	do_div(temp, mp->shared->t_clk);
+	do_div(temp, mp->t_clk);
 
 	return (unsigned int)temp;
 }
@@ -1354,7 +1361,7 @@ static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
 {
 	u64 temp;
 
-	temp = (u64)usec * mp->shared->t_clk;
+	temp = (u64)usec * mp->t_clk;
 	temp += 31999999;
 	do_div(temp, 64000000);
 
@@ -2662,10 +2669,6 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
 	if (dram)
 		mv643xx_eth_conf_mbus_windows(msp, dram);
 
-	/*
-	 * Detect hardware parameters.
-	 */
-	msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000;
 	msp->tx_csum_limit = (pd != NULL && pd->tx_csum_limit) ?
 					pd->tx_csum_limit : 9 * 1024;
 	infer_hw_params(msp);
@@ -2890,6 +2893,18 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 
 	mp->dev = dev;
 
+	/*
+	 * Get the clk rate, if there is one, otherwise use the default.
+	 */
+	mp->clk = clk_get(&pdev->dev, (pdev->id ? "1" : "0"));
+	if (!IS_ERR(mp->clk)) {
+		clk_prepare_enable(mp->clk);
+		mp->t_clk = clk_get_rate(mp->clk);
+	} else {
+		mp->t_clk = 133000000;
+		printk(KERN_WARNING "Unable to get clock");
+	}
+
 	set_params(mp, pd);
 	netif_set_real_num_tx_queues(dev, mp->txq_count);
 	netif_set_real_num_rx_queues(dev, mp->rxq_count);
@@ -2978,6 +2993,11 @@ static int mv643xx_eth_remove(struct platform_device *pdev)
 	if (mp->phy != NULL)
 		phy_detach(mp->phy);
 	cancel_work_sync(&mp->tx_timeout_task);
+
+	if (!IS_ERR(mp->clk)) {
+		clk_disable_unprepare(mp->clk);
+		clk_put(mp->clk);
+	}
 	free_netdev(mp->dev);
 
 	platform_set_drvdata(pdev, NULL);

include/linux/mv643xx_eth.h

@@ -18,7 +18,6 @@
 struct mv643xx_eth_shared_platform_data {
 	struct mbus_dram_target_info	*dram;
 	struct platform_device	*shared_smi;
-	unsigned int		t_clk;
 	/*
 	 * Max packet size for Tx IP/Layer 4 checksum, when set to 0, default
 	 * limit of 9KiB will be used.