[PATCH 0/3] net: irda: pxaficp_ir: dmaengine conversion

[PATCH 0/3] net: irda: pxaficp_ir: dmaengine conversion

[Robert Jarzmik]

Hi,

This serie aims at converting pxaficp_ir to dmaengine. This is almost the last
driver to be converted, and once this is gone, legacy DMA support in pxa
architecture can be gone.

Nothing fancy here, standard readl/writel conversion, then dmaengine support.

The main trouble is that I cannot test it, I only compiled and inserted the
module, which works on lubbock, but I have no way to make a communcation try.

Petr, Dmitry, once the review is advanced enough, ie. in a couple of weeks, do
you have a way to test it on corgi/magician if I give you a git tree to pull
from ?

Cheers

--
Robert

Robert Jarzmik (3):
  net: irda: pxaficp_ir: use sched_clock() for time management
  net: irda: pxaficp_ir: convert to readl and writel
  net: irda: pxaficp_ir: dmaengine conversion

 drivers/net/irda/pxaficp_ir.c | 366 +++++++++++++++++++++++++++---------------
 1 file changed, 233 insertions(+), 133 deletions(-)

-- 
2.1.4

[PATCH 1/3] net: irda: pxaficp_ir: use sched_clock() for time management

[Robert Jarzmik]

Instead of using directly the OS timer through direct register access,
use the standard sched_clock(), which will end up in OSCR reading
anyway.

This is a first step for direct access register removal and machine
specific code removal from this driver.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/net/irda/pxaficp_ir.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
index 100454662e4b..b1794998c68e 100644
--- a/drivers/net/irda/pxaficp_ir.c
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -29,7 +29,6 @@
 
 #include <mach/dma.h>
 #include <linux/platform_data/irda-pxaficp.h>
-#include <mach/regs-ost.h>
 #include <mach/regs-uart.h>
 
 #define FICP		__REG(0x40800000)  /* Start of FICP area */
@@ -102,7 +101,7 @@
 struct pxa_irda {
 	int			speed;
 	int			newspeed;
-	unsigned long		last_oscr;
+	unsigned long long	last_clk;
 
 	unsigned char		*dma_rx_buff;
 	unsigned char		*dma_tx_buff;
@@ -292,7 +291,7 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 			}
 			lsr = STLSR;
 		}
-		si->last_oscr = readl_relaxed(OSCR);
+		si->last_clk = sched_clock();
 		break;
 
 	case 0x04: /* Received Data Available */
@@ -303,7 +302,7 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 		    dev->stats.rx_bytes++;
 	            async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
 	  	} while (STLSR & LSR_DR);
-		si->last_oscr = readl_relaxed(OSCR);
+		si->last_clk = sched_clock();
 	  	break;
 
 	case 0x02: /* Transmit FIFO Data Request */
@@ -319,7 +318,7 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
                         /* We need to ensure that the transmitter has finished. */
 			while ((STLSR & LSR_TEMT) == 0)
 				cpu_relax();
-			si->last_oscr = readl_relaxed(OSCR);
+			si->last_clk = sched_clock();
 
 			/*
 		 	* Ok, we've finished transmitting.  Now enable
@@ -373,7 +372,7 @@ static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
 
 	while (ICSR1 & ICSR1_TBY)
 		cpu_relax();
-	si->last_oscr = readl_relaxed(OSCR);
+	si->last_clk = sched_clock();
 
 	/*
 	 * HACK: It looks like the TBY bit is dropped too soon.
@@ -473,8 +472,8 @@ static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 
 	/* stop RX DMA */
 	DCSR(si->rxdma) &= ~DCSR_RUN;
-	si->last_oscr = readl_relaxed(OSCR);
 	icsr0 = ICSR0;
+	si->last_clk = sched_clock();
 
 	if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
 		if (icsr0 & ICSR0_FRE) {
@@ -549,7 +548,7 @@ static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 		skb_copy_from_linear_data(skb, si->dma_tx_buff, skb->len);
 
 		if (mtt)
-			while ((unsigned)(readl_relaxed(OSCR) - si->last_oscr)/4 < mtt)
+			while ((sched_clock() - si->last_clk) / 4 < mtt)
 				cpu_relax();
 
 		/* stop RX DMA,  disable FICP */
-- 
2.1.4

[PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Robert Jarzmik]

Convert the pxa IRDA driver to readl and writel primitives, and remove
another set of direct registers access. This leaves only the DMA
registers access, which will be dealt with dmaengine conversion.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/net/irda/pxaficp_ir.c | 210 +++++++++++++++++++++++++-----------------
 1 file changed, 126 insertions(+), 84 deletions(-)

diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
index b1794998c68e..519f6b0568a8 100644
--- a/drivers/net/irda/pxaficp_ir.c
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -29,15 +29,16 @@
 
 #include <mach/dma.h>
 #include <linux/platform_data/irda-pxaficp.h>
+#undef __REG
+#define __REG(x) (x)
 #include <mach/regs-uart.h>
 
-#define FICP		__REG(0x40800000)  /* Start of FICP area */
-#define ICCR0		__REG(0x40800000)  /* ICP Control Register 0 */
-#define ICCR1		__REG(0x40800004)  /* ICP Control Register 1 */
-#define ICCR2		__REG(0x40800008)  /* ICP Control Register 2 */
-#define ICDR		__REG(0x4080000c)  /* ICP Data Register */
-#define ICSR0		__REG(0x40800014)  /* ICP Status Register 0 */
-#define ICSR1		__REG(0x40800018)  /* ICP Status Register 1 */
+#define ICCR0		0x0000		/* ICP Control Register 0 */
+#define ICCR1		0x0004		/* ICP Control Register 1 */
+#define ICCR2		0x0008		/* ICP Control Register 2 */
+#define ICDR		0x000c		/* ICP Data Register */
+#define ICSR0		0x0014		/* ICP Status Register 0 */
+#define ICSR1		0x0018		/* ICP Status Register 1 */
 
 #define ICCR0_AME	(1 << 7)	/* Address match enable */
 #define ICCR0_TIE	(1 << 6)	/* Transmit FIFO interrupt enable */
@@ -55,9 +56,7 @@
 #define ICCR2_TRIG_16   (1 << 0)	/*	>= 16 bytes */
 #define ICCR2_TRIG_32   (2 << 0)	/*	>= 32 bytes */
 
-#ifdef CONFIG_PXA27x
 #define ICSR0_EOC	(1 << 6)	/* DMA End of Descriptor Chain */
-#endif
 #define ICSR0_FRE	(1 << 5)	/* Framing error */
 #define ICSR0_RFS	(1 << 4)	/* Receive FIFO service request */
 #define ICSR0_TFS	(1 << 3)	/* Transnit FIFO service request */
@@ -98,11 +97,50 @@
                 IrSR_RCVEIR_UART_MODE | \
                 IrSR_XMITIR_IR_MODE)
 
+/* macros for registers read/write */
+#define ficp_writel(irda, val, off)					\
+	do {								\
+		dev_vdbg(irda->dev,					\
+			 "%s():%d ficp_writel(0x%x, %s)\n",		\
+			 __func__, __LINE__, (val), #off);		\
+		writel_relaxed((val), (irda)->irda_base + (off));	\
+	} while (0)
+
+#define ficp_readl(irda, off)						\
+	({								\
+		unsigned int _v;					\
+		_v = readl_relaxed((irda)->irda_base + (off));		\
+		dev_vdbg(irda->dev,					\
+			 "%s():%d ficp_readl(%s): 0x%x\n",		\
+			 __func__, __LINE__, #off, _v);			\
+		_v;							\
+	})
+
+#define stuart_writel(irda, val, off)					\
+	do {								\
+		dev_vdbg(irda->dev,					\
+			 "%s():%d stuart_writel(0x%x, %s)\n",		\
+			 __func__, __LINE__, (val), #off);		\
+		writel_relaxed((val), (irda)->stuart_base + (off));	\
+	} while (0)
+
+#define stuart_readl(irda, off)						\
+	({								\
+		unsigned int _v;					\
+		_v = readl_relaxed((irda)->stuart_base + (off));	\
+		dev_vdbg(irda->dev,					\
+			 "%s():%d stuart_readl(%s): 0x%x\n",		\
+			 __func__, __LINE__, #off, _v);			\
+		_v;							\
+	})
+
 struct pxa_irda {
 	int			speed;
 	int			newspeed;
 	unsigned long long	last_clk;
 
+	void __iomem		*stuart_base;
+	void __iomem		*irda_base;
 	unsigned char		*dma_rx_buff;
 	unsigned char		*dma_tx_buff;
 	dma_addr_t		dma_rx_buff_phy;
@@ -153,7 +191,7 @@ static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
 {
 	DCSR(si->rxdma)  = DCSR_NODESC;
-	DSADR(si->rxdma) = __PREG(ICDR);
+	DSADR(si->rxdma) = (unsigned long)si->irda_base + ICDR;
 	DTADR(si->rxdma) = si->dma_rx_buff_phy;
 	DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
 	DCSR(si->rxdma) |= DCSR_RUN;
@@ -163,7 +201,7 @@ inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
 {
 	DCSR(si->txdma)  = DCSR_NODESC;
 	DSADR(si->txdma) = si->dma_tx_buff_phy;
-	DTADR(si->txdma) = __PREG(ICDR);
+	DTADR(si->txdma) = (unsigned long)si->irda_base + ICDR;
 	DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
 	DCSR(si->txdma) |= DCSR_RUN;
 }
@@ -206,7 +244,7 @@ static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 			/* stop RX DMA */
 			DCSR(si->rxdma) &= ~DCSR_RUN;
 			/* disable FICP */
-			ICCR0 = 0;
+			ficp_writel(si, 0, ICCR0);
 			pxa_irda_disable_clk(si);
 
 			/* set board transceiver to SIR mode */
@@ -217,17 +255,19 @@ static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 		}
 
 		/* disable STUART first */
-		STIER = 0;
+		stuart_writel(si, 0, STIER);
 
 		/* access DLL & DLH */
-		STLCR |= LCR_DLAB;
-		STDLL = divisor & 0xff;
-		STDLH = divisor >> 8;
-		STLCR &= ~LCR_DLAB;
+		stuart_writel(si, stuart_readl(si, STLCR) | LCR_DLAB, STLCR);
+		stuart_writel(si, divisor & 0xff, STDLL);
+		stuart_writel(si, divisor >> 8, STDLH);
+		stuart_writel(si, stuart_readl(si, STLCR) & ~LCR_DLAB, STLCR);
 
 		si->speed = speed;
-		STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
-		STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
+		stuart_writel(si, IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6,
+			      STISR);
+		stuart_writel(si, IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE,
+			      STIER);
 
 		local_irq_restore(flags);
 		break;
@@ -236,12 +276,12 @@ static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 		local_irq_save(flags);
 
 		/* disable STUART */
-		STIER = 0;
-		STISR = 0;
+		stuart_writel(si, 0, STIER);
+		stuart_writel(si, 0, STISR);
 		pxa_irda_disable_clk(si);
 
 		/* disable FICP first */
-		ICCR0 = 0;
+		ficp_writel(si, 0, ICCR0);
 
 		/* set board transceiver to FIR mode */
 		pxa_irda_set_mode(si, IR_FIRMODE);
@@ -251,7 +291,7 @@ static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 
 		si->speed = speed;
 		pxa_irda_fir_dma_rx_start(si);
-		ICCR0 = ICCR0_ITR | ICCR0_RXE;
+		ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
 
 		local_irq_restore(flags);
 		break;
@@ -270,13 +310,13 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 	struct pxa_irda *si = netdev_priv(dev);
 	int iir, lsr, data;
 
-	iir = STIIR;
+	iir = stuart_readl(si, STIIR);
 
 	switch  (iir & 0x0F) {
 	case 0x06: /* Receiver Line Status */
-	  	lsr = STLSR;
+		lsr = stuart_readl(si, STLSR);
 		while (lsr & LSR_FIFOE) {
-			data = STRBR;
+			data = stuart_readl(si, STRBR);
 			if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
 				printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
 				dev->stats.rx_errors++;
@@ -289,7 +329,7 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 				async_unwrap_char(dev, &dev->stats,
 						  &si->rx_buff, data);
 			}
-			lsr = STLSR;
+			lsr = stuart_readl(si, STLSR);
 		}
 		si->last_clk = sched_clock();
 		break;
@@ -300,14 +340,16 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 	case 0x0C: /* Character Timeout Indication */
 	  	do  {
 		    dev->stats.rx_bytes++;
-	            async_unwrap_char(dev, &dev->stats, &si->rx_buff, STRBR);
-	  	} while (STLSR & LSR_DR);
+		    async_unwrap_char(dev, &dev->stats, &si->rx_buff,
+				      stuart_readl(si, STRBR));
+		} while (stuart_readl(si, STLSR) & LSR_DR);
 		si->last_clk = sched_clock();
 	  	break;
 
 	case 0x02: /* Transmit FIFO Data Request */
-	    	while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
-	    		STTHR = *si->tx_buff.data++;
+		while ((si->tx_buff.len) &&
+		       (stuart_readl(si, STLSR) & LSR_TDRQ)) {
+			stuart_writel(si, *si->tx_buff.data++, STTHR);
 			si->tx_buff.len -= 1;
 	    	}
 
@@ -316,7 +358,7 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 			dev->stats.tx_bytes += si->tx_buff.data - si->tx_buff.head;
 
                         /* We need to ensure that the transmitter has finished. */
-			while ((STLSR & LSR_TEMT) == 0)
+			while ((stuart_readl(si, STLSR) & LSR_TEMT) == 0)
 				cpu_relax();
 			si->last_clk = sched_clock();
 
@@ -330,9 +372,11 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 				si->newspeed = 0;
 			} else {
 				/* enable IR Receiver, disable IR Transmitter */
-				STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
+				stuart_writel(si, IrSR_IR_RECEIVE_ON |
+					      IrSR_XMODE_PULSE_1_6, STISR);
 				/* enable STUART and receive interrupts */
-				STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
+				stuart_writel(si, IER_UUE | IER_RLSE |
+					      IER_RAVIE | IER_RTIOE, STIER);
 			}
 			/* I'm hungry! */
 			netif_wake_queue(dev);
@@ -370,7 +414,7 @@ static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
 		dev->stats.tx_errors++;
 	}
 
-	while (ICSR1 & ICSR1_TBY)
+	while (ficp_readl(si, ICSR1) & ICSR1_TBY)
 		cpu_relax();
 	si->last_clk = sched_clock();
 
@@ -386,11 +430,11 @@ static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
 	} else {
 		int i = 64;
 
-		ICCR0 = 0;
+		ficp_writel(si, 0, ICCR0);
 		pxa_irda_fir_dma_rx_start(si);
-		while ((ICSR1 & ICSR1_RNE) && i--)
-			(void)ICDR;
-		ICCR0 = ICCR0_ITR | ICCR0_RXE;
+		while ((ficp_readl(si, ICSR1) & ICSR1_RNE) && i--)
+			ficp_readl(si, ICDR);
+		ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
 
 		if (i < 0)
 			printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
@@ -408,9 +452,9 @@ static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, in
 
 	do {
 		/* Read Status, and then Data. 	 */
-		stat = ICSR1;
+		stat = ficp_readl(si, ICSR1);
 		rmb();
-		data = ICDR;
+		data = ficp_readl(si, ICDR);
 
 		if (stat & (ICSR1_CRE | ICSR1_ROR)) {
 			dev->stats.rx_errors++;
@@ -428,7 +472,7 @@ static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, in
 		/* If we hit the end of frame, there's no point in continuing. */
 		if (stat & ICSR1_EOF)
 			break;
-	} while (ICSR0 & ICSR0_EIF);
+	} while (ficp_readl(si, ICSR0) & ICSR0_EIF);
 
 	if (stat & ICSR1_EOF) {
 		/* end of frame. */
@@ -472,8 +516,8 @@ static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 
 	/* stop RX DMA */
 	DCSR(si->rxdma) &= ~DCSR_RUN;
-	icsr0 = ICSR0;
 	si->last_clk = sched_clock();
+	icsr0 = ficp_readl(si, ICSR0);
 
 	if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
 		if (icsr0 & ICSR0_FRE) {
@@ -483,7 +527,7 @@ static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 			printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
 			dev->stats.rx_errors++;
 		}
-		ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
+		ficp_writel(si, icsr0 & (ICSR0_FRE | ICSR0_RAB), ICSR0);
 	}
 
 	if (icsr0 & ICSR0_EIF) {
@@ -491,11 +535,11 @@ static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 		pxa_irda_fir_irq_eif(si, dev, icsr0);
 	}
 
-	ICCR0 = 0;
+	ficp_writel(si, 0, ICCR0);
 	pxa_irda_fir_dma_rx_start(si);
-	while ((ICSR1 & ICSR1_RNE) && i--)
-		(void)ICDR;
-	ICCR0 = ICCR0_ITR | ICCR0_RXE;
+	while ((ficp_readl(si, ICSR1) & ICSR1_RNE) && i--)
+		ficp_readl(si, ICDR);
+	ficp_writel(si, ICCR0_ITR | ICCR0_RXE, ICCR0);
 
 	if (i < 0)
 		printk(KERN_ERR "pxa_ir: cannot clear Rx FIFO!\n");
@@ -536,11 +580,12 @@ static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 		si->tx_buff.len  = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
 
 		/* Disable STUART interrupts and switch to transmit mode. */
-		STIER = 0;
-		STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
+		stuart_writel(si, 0, STIER);
+		stuart_writel(si, IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6,
+			      STISR);
 
 		/* enable STUART and transmit interrupts */
-		STIER = IER_UUE | IER_TIE;
+		stuart_writel(si, IER_UUE | IER_TIE, STIER);
 	} else {
 		unsigned long mtt = irda_get_mtt(skb);
 
@@ -553,10 +598,10 @@ static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 
 		/* stop RX DMA,  disable FICP */
 		DCSR(si->rxdma) &= ~DCSR_RUN;
-		ICCR0 = 0;
+		ficp_writel(si, 0, ICCR0);
 
 		pxa_irda_fir_dma_tx_start(si);
-		ICCR0 = ICCR0_ITR | ICCR0_TXE;
+		ficp_writel(si, ICCR0_ITR | ICCR0_TXE, ICCR0);
 	}
 
 	dev_kfree_skb(skb);
@@ -612,18 +657,18 @@ static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
 static void pxa_irda_startup(struct pxa_irda *si)
 {
 	/* Disable STUART interrupts */
-	STIER = 0;
+	stuart_writel(si, 0, STIER);
 	/* enable STUART interrupt to the processor */
-	STMCR = MCR_OUT2;
+	stuart_writel(si, MCR_OUT2, STMCR);
 	/* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
-	STLCR = LCR_WLS0 | LCR_WLS1;
+	stuart_writel(si, LCR_WLS0 | LCR_WLS1, STLCR);
 	/* enable FIFO, we use FIFO to improve performance */
-	STFCR = FCR_TRFIFOE | FCR_ITL_32;
+	stuart_writel(si, FCR_TRFIFOE | FCR_ITL_32, STFCR);
 
 	/* disable FICP */
-	ICCR0 = 0;
+	ficp_writel(si, 0, ICCR0);
 	/* configure FICP ICCR2 */
-	ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
+	ficp_writel(si, ICCR2_TXP | ICCR2_TRIG_32, ICCR2);
 
 	/* configure DMAC */
 	DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
@@ -643,15 +688,15 @@ static void pxa_irda_shutdown(struct pxa_irda *si)
 	local_irq_save(flags);
 
 	/* disable STUART and interrupt */
-	STIER = 0;
+	stuart_writel(si, 0, STIER);
 	/* disable STUART SIR mode */
-	STISR = 0;
+	stuart_writel(si, 0, STISR);
 
 	/* disable DMA */
 	DCSR(si->txdma) &= ~DCSR_RUN;
 	DCSR(si->rxdma) &= ~DCSR_RUN;
 	/* disable FICP */
-	ICCR0 = 0;
+	ficp_writel(si, 0, ICCR0);
 
 	/* disable the STUART or FICP clocks */
 	pxa_irda_disable_clk(si);
@@ -829,25 +874,33 @@ static const struct net_device_ops pxa_irda_netdev_ops = {
 static int pxa_irda_probe(struct platform_device *pdev)
 {
 	struct net_device *dev;
+	struct resource *res;
 	struct pxa_irda *si;
+	void __iomem *ficp, *stuart;
 	unsigned int baudrate_mask;
 	int err;
 
 	if (!pdev->dev.platform_data)
 		return -ENODEV;
 
-	err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
-	if (err)
-		goto err_mem_1;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	ficp = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ficp)) {
+		dev_err(&pdev->dev, "resource ficp not defined\n");
+		return PTR_ERR(ficp);
+	}
 
-	err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
-	if (err)
-		goto err_mem_2;
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	stuart = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(stuart)) {
+		dev_err(&pdev->dev, "resource stuart not defined\n");
+		return PTR_ERR(stuart);
+	}
 
 	dev = alloc_irdadev(sizeof(struct pxa_irda));
 	if (!dev) {
 		err = -ENOMEM;
-		goto err_mem_3;
+		goto err_mem_1;
 	}
 
 	SET_NETDEV_DEV(dev, &pdev->dev);
@@ -855,11 +908,13 @@ static int pxa_irda_probe(struct platform_device *pdev)
 	si->dev = &pdev->dev;
 	si->pdata = pdev->dev.platform_data;
 
+	si->irda_base = ficp;
+	si->stuart_base = stuart;
 	si->uart_irq = platform_get_irq(pdev, 0);
 	si->icp_irq = platform_get_irq(pdev, 1);
 
-	si->sir_clk = clk_get(&pdev->dev, "UARTCLK");
-	si->fir_clk = clk_get(&pdev->dev, "FICPCLK");
+	si->sir_clk = devm_clk_get(&pdev->dev, "UARTCLK");
+	si->fir_clk = devm_clk_get(&pdev->dev, "FICPCLK");
 	if (IS_ERR(si->sir_clk) || IS_ERR(si->fir_clk)) {
 		err = PTR_ERR(IS_ERR(si->sir_clk) ? si->sir_clk : si->fir_clk);
 		goto err_mem_4;
@@ -924,15 +979,7 @@ err_startup:
 err_mem_5:
 		kfree(si->rx_buff.head);
 err_mem_4:
-		if (si->sir_clk && !IS_ERR(si->sir_clk))
-			clk_put(si->sir_clk);
-		if (si->fir_clk && !IS_ERR(si->fir_clk))
-			clk_put(si->fir_clk);
 		free_netdev(dev);
-err_mem_3:
-		release_mem_region(__PREG(FICP), 0x1c);
-err_mem_2:
-		release_mem_region(__PREG(STUART), 0x24);
 	}
 err_mem_1:
 	return err;
@@ -951,14 +998,9 @@ static int pxa_irda_remove(struct platform_device *_dev)
 			si->pdata->shutdown(si->dev);
 		kfree(si->tx_buff.head);
 		kfree(si->rx_buff.head);
-		clk_put(si->fir_clk);
-		clk_put(si->sir_clk);
 		free_netdev(dev);
 	}
 
-	release_mem_region(__PREG(STUART), 0x24);
-	release_mem_region(__PREG(FICP), 0x1c);
-
 	return 0;
 }
 
-- 
2.1.4

[PATCH 3/3] net: irda: pxaficp_ir: dmaengine conversion

[Robert Jarzmik]

Convert pxaficp_ir to dmaengine. As pxa architecture is shifting from
raw DMA registers access to pxa_dma dmaengine driver, convert this
driver to dmaengine.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 drivers/net/irda/pxaficp_ir.c | 145 +++++++++++++++++++++++++++++-------------
 1 file changed, 102 insertions(+), 43 deletions(-)

diff --git a/drivers/net/irda/pxaficp_ir.c b/drivers/net/irda/pxaficp_ir.c
index 519f6b0568a8..42318fb2c95a 100644
--- a/drivers/net/irda/pxaficp_ir.c
+++ b/drivers/net/irda/pxaficp_ir.c
@@ -19,6 +19,9 @@
 #include <linux/etherdevice.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/dma/pxa-dma.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
 
@@ -146,8 +149,12 @@ struct pxa_irda {
 	dma_addr_t		dma_rx_buff_phy;
 	dma_addr_t		dma_tx_buff_phy;
 	unsigned int		dma_tx_buff_len;
-	int			txdma;
-	int			rxdma;
+	struct dma_chan		*txdma;
+	struct dma_chan		*rxdma;
+	dma_cookie_t		rx_cookie;
+	dma_cookie_t		tx_cookie;
+	int			drcmr_rx;
+	int			drcmr_tx;
 
 	int			uart_irq;
 	int			icp_irq;
@@ -165,6 +172,8 @@ struct pxa_irda {
 	struct clk		*cur_clk;
 };
 
+static int pxa_irda_set_speed(struct pxa_irda *si, int speed);
+
 static inline void pxa_irda_disable_clk(struct pxa_irda *si)
 {
 	if (si->cur_clk)
@@ -188,22 +197,41 @@ static inline void pxa_irda_enable_sirclk(struct pxa_irda *si)
 #define IS_FIR(si)		((si)->speed >= 4000000)
 #define IRDA_FRAME_SIZE_LIMIT	2047
 
+static void pxa_irda_fir_dma_rx_irq(void *data);
+static void pxa_irda_fir_dma_tx_irq(void *data);
+
 inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
 {
-	DCSR(si->rxdma)  = DCSR_NODESC;
-	DSADR(si->rxdma) = (unsigned long)si->irda_base + ICDR;
-	DTADR(si->rxdma) = si->dma_rx_buff_phy;
-	DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC |  DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
-	DCSR(si->rxdma) |= DCSR_RUN;
+	struct dma_async_tx_descriptor *tx;
+
+	tx = dmaengine_prep_slave_single(si->rxdma, si->dma_rx_buff_phy,
+					 IRDA_FRAME_SIZE_LIMIT, DMA_FROM_DEVICE,
+					 DMA_PREP_INTERRUPT);
+	if (!tx) {
+		dev_err(si->dev, "prep_slave_sg() failed\n");
+		return;
+	}
+	tx->callback = pxa_irda_fir_dma_rx_irq;
+	tx->callback_param = si;
+	si->rx_cookie = dmaengine_submit(tx);
+	dma_async_issue_pending(si->rxdma);
 }
 
 inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
 {
-	DCSR(si->txdma)  = DCSR_NODESC;
-	DSADR(si->txdma) = si->dma_tx_buff_phy;
-	DTADR(si->txdma) = (unsigned long)si->irda_base + ICDR;
-	DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG |  DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
-	DCSR(si->txdma) |= DCSR_RUN;
+	struct dma_async_tx_descriptor *tx;
+
+	tx = dmaengine_prep_slave_single(si->txdma, si->dma_tx_buff_phy,
+					 si->dma_tx_buff_len, DMA_TO_DEVICE,
+					 DMA_PREP_INTERRUPT);
+	if (!tx) {
+		dev_err(si->dev, "prep_slave_sg() failed\n");
+		return;
+	}
+	tx->callback = pxa_irda_fir_dma_tx_irq;
+	tx->callback_param = si;
+	si->tx_cookie = dmaengine_submit(tx);
+	dma_async_issue_pending(si->rxdma);
 }
 
 /*
@@ -242,7 +270,7 @@ static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
 
 		if (IS_FIR(si)) {
 			/* stop RX DMA */
-			DCSR(si->rxdma) &= ~DCSR_RUN;
+			dmaengine_terminate_all(si->rxdma);
 			/* disable FICP */
 			ficp_writel(si, 0, ICCR0);
 			pxa_irda_disable_clk(si);
@@ -388,30 +416,27 @@ static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
 }
 
 /* FIR Receive DMA interrupt handler */
-static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
+static void pxa_irda_fir_dma_rx_irq(void *data)
 {
-	int dcsr = DCSR(channel);
-
-	DCSR(channel) = dcsr & ~DCSR_RUN;
+	struct net_device *dev = data;
+	struct pxa_irda *si = netdev_priv(dev);
 
-	printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
+	dmaengine_terminate_all(si->rxdma);
+	netdev_dbg(dev, "pxa_ir: fir rx dma bus error\n");
 }
 
 /* FIR Transmit DMA interrupt handler */
-static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
+static void pxa_irda_fir_dma_tx_irq(void *data)
 {
 	struct net_device *dev = data;
 	struct pxa_irda *si = netdev_priv(dev);
-	int dcsr;
-
-	dcsr = DCSR(channel);
-	DCSR(channel) = dcsr & ~DCSR_RUN;
 
-	if (dcsr & DCSR_ENDINTR)  {
+	dmaengine_terminate_all(si->txdma);
+	if (dmaengine_tx_status(si->txdma, si->tx_cookie, NULL) == DMA_ERROR) {
+		dev->stats.tx_errors++;
+	} else {
 		dev->stats.tx_packets++;
 		dev->stats.tx_bytes += si->dma_tx_buff_len;
-	} else {
-		dev->stats.tx_errors++;
 	}
 
 	while (ficp_readl(si, ICSR1) & ICSR1_TBY)
@@ -446,9 +471,12 @@ static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
 static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev, int icsr0)
 {
 	unsigned int len, stat, data;
+	struct dma_tx_state state;
 
 	/* Get the current data position. */
-	len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
+
+	dmaengine_tx_status(si->rxdma, si->rx_cookie, &state);
+	len = IRDA_FRAME_SIZE_LIMIT - state.residue;
 
 	do {
 		/* Read Status, and then Data. 	 */
@@ -515,7 +543,7 @@ static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
 	int icsr0, i = 64;
 
 	/* stop RX DMA */
-	DCSR(si->rxdma) &= ~DCSR_RUN;
+	dmaengine_terminate_all(si->rxdma);
 	si->last_clk = sched_clock();
 	icsr0 = ficp_readl(si, ICSR0);
 
@@ -597,7 +625,7 @@ static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
 				cpu_relax();
 
 		/* stop RX DMA,  disable FICP */
-		DCSR(si->rxdma) &= ~DCSR_RUN;
+		dmaengine_terminate_all(si->rxdma);
 		ficp_writel(si, 0, ICCR0);
 
 		pxa_irda_fir_dma_tx_start(si);
@@ -670,10 +698,6 @@ static void pxa_irda_startup(struct pxa_irda *si)
 	/* configure FICP ICCR2 */
 	ficp_writel(si, ICCR2_TXP | ICCR2_TRIG_32, ICCR2);
 
-	/* configure DMAC */
-	DRCMR(17) = si->rxdma | DRCMR_MAPVLD;
-	DRCMR(18) = si->txdma | DRCMR_MAPVLD;
-
 	/* force SIR reinitialization */
 	si->speed = 4000000;
 	pxa_irda_set_speed(si, 9600);
@@ -693,8 +717,8 @@ static void pxa_irda_shutdown(struct pxa_irda *si)
 	stuart_writel(si, 0, STISR);
 
 	/* disable DMA */
-	DCSR(si->txdma) &= ~DCSR_RUN;
-	DCSR(si->rxdma) &= ~DCSR_RUN;
+	dmaengine_terminate_all(si->rxdma);
+	dmaengine_terminate_all(si->txdma);
 	/* disable FICP */
 	ficp_writel(si, 0, ICCR0);
 
@@ -715,6 +739,9 @@ static void pxa_irda_shutdown(struct pxa_irda *si)
 static int pxa_irda_start(struct net_device *dev)
 {
 	struct pxa_irda *si = netdev_priv(dev);
+	dma_cap_mask_t mask;
+	struct dma_slave_config	config;
+	struct pxad_param param;
 	int err;
 
 	si->speed = 9600;
@@ -734,14 +761,37 @@ static int pxa_irda_start(struct net_device *dev)
 	disable_irq(si->icp_irq);
 
 	err = -EBUSY;
-	si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
-	if (si->rxdma < 0)
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+	param.prio = PXAD_PRIO_LOWEST;
+
+	memset(&config, 0, sizeof(config));
+	config.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+	config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+	config.src_addr = (dma_addr_t)si->irda_base + ICDR;
+	config.dst_addr = (dma_addr_t)si->irda_base + ICDR;
+	config.src_maxburst = 32;
+	config.dst_maxburst = 32;
+
+	param.drcmr = si->drcmr_rx;
+	si->rxdma = dma_request_slave_channel_compat(mask, pxad_filter_fn,
+						     &param, &dev->dev, "rx");
+	if (!si->rxdma)
 		goto err_rx_dma;
 
-	si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
-	if (si->txdma < 0)
+	param.drcmr = si->drcmr_tx;
+	si->txdma = dma_request_slave_channel_compat(mask, pxad_filter_fn,
+						     &param, &dev->dev, "tx");
+	if (!si->txdma)
 		goto err_tx_dma;
 
+	err = dmaengine_slave_config(si->rxdma, &config);
+	if (err)
+		goto err_dma_rx_buff;
+	err = dmaengine_slave_config(si->txdma, &config);
+	if (err)
+		goto err_dma_rx_buff;
+
 	err = -ENOMEM;
 	si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
 					     &si->dma_rx_buff_phy, GFP_KERNEL);
@@ -781,9 +831,9 @@ err_irlap:
 err_dma_tx_buff:
 	dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
 err_dma_rx_buff:
-	pxa_free_dma(si->txdma);
+	dma_release_channel(si->txdma);
 err_tx_dma:
-	pxa_free_dma(si->rxdma);
+	dma_release_channel(si->rxdma);
 err_rx_dma:
 	free_irq(si->icp_irq, dev);
 err_irq2:
@@ -810,8 +860,10 @@ static int pxa_irda_stop(struct net_device *dev)
 	free_irq(si->uart_irq, dev);
 	free_irq(si->icp_irq, dev);
 
-	pxa_free_dma(si->rxdma);
-	pxa_free_dma(si->txdma);
+	dmaengine_terminate_all(si->rxdma);
+	dmaengine_terminate_all(si->txdma);
+	dma_release_channel(si->rxdma);
+	dma_release_channel(si->txdma);
 
 	if (si->dma_rx_buff)
 		dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
@@ -920,6 +972,13 @@ static int pxa_irda_probe(struct platform_device *pdev)
 		goto err_mem_4;
 	}
 
+	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (res)
+		si->drcmr_rx = res->start;
+	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+	if (res)
+		si->drcmr_tx = res->start;
+
 	/*
 	 * Initialise the SIR buffers
 	 */
-- 
2.1.4

Re: [PATCH 0/3] net: irda: pxaficp_ir: dmaengine conversion

[Petr Cvek]

Dne 3.9.2015 v 08:20 Robert Jarzmik napsal(a):
> Hi,
> 
> This serie aims at converting pxaficp_ir to dmaengine. This is almost the last
> driver to be converted, and once this is gone, legacy DMA support in pxa
> architecture can be gone.
> 
> Nothing fancy here, standard readl/writel conversion, then dmaengine support.
> 
> The main trouble is that I cannot test it, I only compiled and inserted the
> module, which works on lubbock, but I have no way to make a communcation try.
> 
> Petr, Dmitry, once the review is advanced enough, ie. in a couple of weeks, do
> you have a way to test it on corgi/magician if I give you a git tree to pull
> from ?
> 
> Cheers
> 
> --
> Robert
> 
> Robert Jarzmik (3):
>   net: irda: pxaficp_ir: use sched_clock() for time management
>   net: irda: pxaficp_ir: convert to readl and writel
>   net: irda: pxaficp_ir: dmaengine conversion
> 
>  drivers/net/irda/pxaficp_ir.c | 366 +++++++++++++++++++++++++++---------------
>  1 file changed, 233 insertions(+), 133 deletions(-)
> 

Hi,
I will test it this week.

OT: (hw verified) Magician sadly does not support FIR (only SIR transceiver module) :-( .

Petr

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 3.9.2015 v 08:20 Robert Jarzmik napsal(a):
> Convert the pxa IRDA driver to readl and writel primitives, and remove
> another set of direct registers access. This leaves only the DMA
> registers access, which will be dealt with dmaengine conversion.

Test on magician (nonvanilla, but there should not be any collision).

>  
> -	err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
> -	if (err)
> -		goto err_mem_1;
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	ficp = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(ficp)) {
> +		dev_err(&pdev->dev, "resource ficp not defined\n");

Fails around here with:

[ 4245.368764] pxa2xx-ir pxa2xx-ir: invalid resource
[ 4245.369191] pxa2xx-ir pxa2xx-ir: resource ficp not defined
[ 4245.369364] pxa2xx-ir: probe of pxa2xx-ir failed with error -22

Did you defined resources somewhere? Actual resources are in "pxa_ir_resources" variable at:

	http://lxr.free-electrons.com/source/arch/arm/mach-pxa/devices.c#L386

or this pdata should be moved into specific machine files?

Cheers,
Petr

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 8.9.2015 v 22:24 Petr Cvek napsal(a):
> 
> Did you defined resources somewhere? Actual resources are in "pxa_ir_resources" variable at:
> 
> 	http://lxr.free-electrons.com/source/arch/arm/mach-pxa/devices.c#L386
> 
> or this pdata should be moved into specific machine files?
> 

I tried to add following patch for new resources, but now it fails with:

[  141.534545] pxa2xx-ir pxa2xx-ir: can't request region for resource [mem 0x40700000-0x40700100]
[  141.534574] pxa2xx-ir pxa2xx-ir: resource stuart not defined
[  141.534656] pxa2xx-ir: probe of pxa2xx-ir failed with error -16

That's because STUART is allocated by normal UART driver at:

	http://lxr.free-electrons.com/source/arch/arm/mach-pxa/devices.c#L244

So somehow there must be configuration for STUART used with FICP and STUART alone (probably can be used for normal UART).


diff --git a/arch/arm/mach-pxa/devices.c b/arch/arm/mach-pxa/devices.c
index 3543466..316ffa3 100644
--- a/arch/arm/mach-pxa/devices.c
+++ b/arch/arm/mach-pxa/devices.c
@@ -394,6 +394,26 @@ static struct resource pxa_ir_resources[] = {
 		.end    = IRQ_ICP,
 		.flags  = IORESOURCE_IRQ,
 	},
+	[2] = {
+		.start  = 0x40800000,
+		.end    = 0x40800000 + 0x100,
+		.flags  = IORESOURCE_MEM,
+	},
+	[3] = {
+		.start  = 0x40700000,
+		.end    = 0x40700000 + 0x100,
+		.flags  = IORESOURCE_MEM,
+	},
+	[4] = {
+		.start  = 17,
+		.end    = 17,
+		.flags  = IORESOURCE_DMA,
+	},
+	[5] = {
+		.start  = 18,
+		.end    = 18,
+		.flags  = IORESOURCE_DMA,
+	},
 };
 
 struct platform_device pxa_device_ficp = {
-- 
1.7.12.1

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Robert Jarzmik]

Petr Cvek <petr.cvek@tul.cz> writes:

> Dne 8.9.2015 v 22:24 Petr Cvek napsal(a):
>> 
>> Did you defined resources somewhere? Actual resources are in
>> "pxa_ir_resources" variable at:
I have them in patch [1], which is exactly the patch you have made yourself.

> I tried to add following patch for new resources, but now it fails with:
>
> [  141.534545] pxa2xx-ir pxa2xx-ir: can't request region for resource [mem 0x40700000-0x40700100]
> [  141.534574] pxa2xx-ir pxa2xx-ir: resource stuart not defined
> [  141.534656] pxa2xx-ir: probe of pxa2xx-ir failed with error -16
>
> That's because STUART is allocated by normal UART driver at:
>
> 	http://lxr.free-electrons.com/source/arch/arm/mach-pxa/devices.c#L244
>
> So somehow there must be configuration for STUART used with FICP and STUART
> alone (probably can be used for normal UART).
That's because you have to remove from magician.c:
	pxa_set_stuart_info(NULL);

Cheers.

--
Robert

[1]
>From ea242c5b1c4dcdf2a99ea604ee542ded5e6384b9 Mon Sep 17 00:00:00 2001
From: Robert Jarzmik <robert.jarzmik@free.fr>
Date: Sat, 29 Aug 2015 00:37:51 +0200
Subject: [PATCH] ARM: pxa: add resources to pxaficp_ir

Add io memory and dma requestor lines to the irda pxa device. This is
part of the conversion of pxaficp_ir to dmaengine, and to shrink its
adherence to 'mach' includes.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 arch/arm/mach-pxa/devices.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/mach-pxa/devices.c b/arch/arm/mach-pxa/devices.c
index e6ce669b54af..6d5ab8199536 100644
--- a/arch/arm/mach-pxa/devices.c
+++ b/arch/arm/mach-pxa/devices.c
@@ -395,6 +395,26 @@ static struct resource pxa_ir_resources[] = {
 		.end    = IRQ_ICP,
 		.flags  = IORESOURCE_IRQ,
 	},
+	[3] = {
+		.start  = 0x40800000,
+		.end	= 0x4080001b,
+		.flags  = IORESOURCE_MEM,
+	},
+	[4] = {
+		.start  = 0x40700000,
+		.end	= 0x40700023,
+		.flags  = IORESOURCE_MEM,
+	},
+	[5] = {
+		.start  = 17,
+		.end	= 17,
+		.flags  = IORESOURCE_DMA,
+	},
+	[6] = {
+		.start  = 18,
+		.end	= 18,
+		.flags  = IORESOURCE_DMA,
+	},
 };
 
 struct platform_device pxa_device_ficp = {
-- 
2.1.4

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 9.9.2015 v 08:25 Robert Jarzmik napsal(a):
> Petr Cvek <petr.cvek@tul.cz> writes:
> 
>> Dne 8.9.2015 v 22:24 Petr Cvek napsal(a):
>>>
>>> Did you defined resources somewhere? Actual resources are in
>>> "pxa_ir_resources" variable at:
> I have them in patch [1], which is exactly the patch you have made yourself.

Is there a mailing list for this specific patch? It seems I did not get any mail with it.

> 
>> I tried to add following patch for new resources, but now it fails with:
>>
>> [  141.534545] pxa2xx-ir pxa2xx-ir: can't request region for resource [mem 0x40700000-0x40700100]
>> [  141.534574] pxa2xx-ir pxa2xx-ir: resource stuart not defined
>> [  141.534656] pxa2xx-ir: probe of pxa2xx-ir failed with error -16
>>
>> That's because STUART is allocated by normal UART driver at:
>>
>> 	http://lxr.free-electrons.com/source/arch/arm/mach-pxa/devices.c#L244
>>
>> So somehow there must be configuration for STUART used with FICP and STUART
>> alone (probably can be used for normal UART).
> That's because you have to remove from magician.c:
> 	pxa_set_stuart_info(NULL);
> 

Thanks, I missed that.

BTW This patch required update of my kernel repo. It seems that my:

	magician.c patches + ficp patch + new dma engine

does not work for me at all. Kernel throws some panic about interrupts and then it ends in an infinite stack dumping loop. Fault occurs before rootfs is mounted, so probably around MMC init (with removed SD card it fails normally with no rootfs found error).

Is it required to change something in the mach-pxa machine specific files?

Which hardware was used for testing new dma engine implementation? Notably MMC driver part, probably commit:

	6464b71409511939efce1ae4fb4ec6e3483b11b2

Best regards,
Petr

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Robert Jarzmik]

Petr Cvek <petr.cvek@tul.cz> writes:

> Dne 9.9.2015 v 08:25 Robert Jarzmik napsal(a):
>> Petr Cvek <petr.cvek@tul.cz> writes:
>> 
>>> Dne 8.9.2015 v 22:24 Petr Cvek napsal(a):
>>>>
>>>> Did you defined resources somewhere? Actual resources are in
>>>> "pxa_ir_resources" variable at:
>> I have them in patch [1], which is exactly the patch you have made yourself.
>
> Is there a mailing list for this specific patch? It seems I did not get any
> mail with it.
Should have been posted to linux arm kernel mailing list, unless my mailer
failed ...

> BTW This patch required update of my kernel repo. It seems that my:
>
> 	magician.c patches + ficp patch + new dma engine
>
> does not work for me at all. Kernel throws some panic about interrupts and then
> it ends in an infinite stack dumping loop. Fault occurs before rootfs is
> mounted, so probably around MMC init (with removed SD card it fails normally
> with no rootfs found error).
Could you send me (privately) the stack you're getting please. This is something
I'd like to catch up early in the -rc releases.

> Is it required to change something in the mach-pxa machine specific files?
Nope. As long as CONFIG_PXA_DMA is set, it's alright. Building on top of
linux-next of the future v4.3-rc1 would be better, as the dmaengine support
should be consistent across drivers/dma and arch/arm/mach-pxa in there.

> Which hardware was used for testing new dma engine implementation? Notably MMC
> driver part, probably commit:
Mioa701 (pxa270), cm-x300 (pxa310), zylonite (pxa310). The MMC was specificaly
tested on mioa701, on top of linux-next a week ago (about the day v4.2 was released).

Now with your stack, could you also give me the upstream commit id of the tip of
the tree you're using (before your patches) please ?

And it is true I have not tested the rootfs special case, where drivers are not
yet initialized (and more specifically gpio and interrupt chip). Your backtrace
should tell me if you fall into this category of issues ... but I digress, this
has no link with pxaficp.

Cheers.

-- 
Robert

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 10.9.2015 v 13:14 Robert Jarzmik napsal(a):
> Petr Cvek <petr.cvek@tul.cz> writes:
> 
>> Dne 9.9.2015 v 08:25 Robert Jarzmik napsal(a):
>>> Petr Cvek <petr.cvek@tul.cz> writes:
>>>
>>>> Dne 8.9.2015 v 22:24 Petr Cvek napsal(a):
>>>>>
>>>>> Did you defined resources somewhere? Actual resources are in
>>>>> "pxa_ir_resources" variable at:
>>> I have them in patch [1], which is exactly the patch you have made yourself.
>>
>> Is there a mailing list for this specific patch? It seems I did not get any
>> mail with it.
> Should have been posted to linux arm kernel mailing list, unless my mailer
> failed ...
> 
Searching for:

	"ARM: pxa: add resources to pxaficp_ir"

did not found anything, same was for "ficp" in the linux-arm-kernel/netdev/linux-kernel
mailing list archive.

>> BTW This patch required update of my kernel repo. It seems that my:
>>
>> 	magician.c patches + ficp patch + new dma engine
>>
>> does not work for me at all. Kernel throws some panic about interrupts and then
>> it ends in an infinite stack dumping loop. Fault occurs before rootfs is
>> mounted, so probably around MMC init (with removed SD card it fails normally
>> with no rootfs found error).
> Could you send me (privately) the stack you're getting please. This is something
> I'd like to catch up early in the -rc releases.

Well this will be problem as I cannot save anything to an SD card after and during the failure.
Only viable interfaces would be earlycon on an infraport or high speed camera on LCD :-). 

But I was able to revert this commit:

	6464b71409511939efce1ae4fb4ec6e3483b11b2	mmc: pxamci: switch over to dmaengine use

and after that I am able to boot.

> 
> Now with your stack, could you also give me the upstream commit id of the tip of
> the tree you're using (before your patches) please ?

It is probably irelevant now, but for complete information:

Discovered on my working repo: mainline b8889c4fc6ba03e289cec6a4d692f6f080a55e53
Still present on fresh downloaded: linux-next 22dc312d56ba077db27a9798b340e7d161f1df05

> 
> And it is true I have not tested the rootfs special case, where drivers are not
> yet initialized (and more specifically gpio and interrupt chip). Your backtrace
> should tell me if you fall into this category of issues ... but I digress, this
> has no link with pxaficp.

Should I start new thread? (same bug can be present in the FICP too)

I will try to configure an initrd rootfs this should create more ways to save kernel log.


Anyway after mmc dma revert I was still not able to start FICP. There is an error:

	Unable to handle kernel paging request at virtual address 32e00004

from pxa_irda_startup() and it seems it is caused by register definitions. For example:

	writel_relaxed((val), (irda)->stuart_base + (off));

is called by

	stuart_writel(si, 0, STIER);

but STIER is not just an offset, but full register address:
	
	__REG(0x40700004)

So the definition should be changed, unless there is another patch I did not received (in that case, send me full patchset again please) :-).


Best regards,
Petr

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Robert Jarzmik]

Petr Cvek <petr.cvek@tul.cz> writes:

>> Should have been posted to linux arm kernel mailing list, unless my mailer
>> failed ...
>> 
> Searching for:
>
> 	"ARM: pxa: add resources to pxaficp_ir"
>
> did not found anything, same was for "ficp" in the linux-arm-kernel/netdev/linux-kernel
> mailing list archive.
Ah ok, I'll resend it then.

>>> BTW This patch required update of my kernel repo. It seems that my:
>>>
>>> 	magician.c patches + ficp patch + new dma engine
>>>
>>> does not work for me at all. Kernel throws some panic about interrupts and then
>>> it ends in an infinite stack dumping loop. Fault occurs before rootfs is
>>> mounted, so probably around MMC init (with removed SD card it fails normally
>>> with no rootfs found error).
>> Could you send me (privately) the stack you're getting please. This is something
>> I'd like to catch up early in the -rc releases.
>
> Well this will be problem as I cannot save anything to an SD card after and
> during the failure.  Only viable interfaces would be earlycon on an infraport
> or high speed camera on LCD :-).
Ah just as on my mioa701. I ended up soldering a JTAG cable :)

> But I was able to revert this commit:
>
> 	6464b71409511939efce1ae4fb4ec6e3483b11b2	mmc: pxamci: switch over to dmaengine use
>
> and after that I am able to boot.
Okay. I'll try to reproduce this failure then. If I fail, well, before using the
JTAG cable, I used another trick: I was taking a movie from the LCD with a
smartphone, and it worked. It was an horrible thing to decrypt ... Let's hope
I'll be lucky on one of my platforms.

>> Now with your stack, could you also give me the upstream commit id of the tip of
>> the tree you're using (before your patches) please ?
>
> It is probably irelevant now, but for complete information:
>
> Discovered on my working repo: mainline b8889c4fc6ba03e289cec6a4d692f6f080a55e53
> Still present on fresh downloaded: linux-next
> 22dc312d56ba077db27a9798b340e7d161f1df05
Ok, thanks.

>> And it is true I have not tested the rootfs special case, where drivers are not
>> yet initialized (and more specifically gpio and interrupt chip). Your backtrace
>> should tell me if you fall into this category of issues ... but I digress, this
>> has no link with pxaficp.
>
> Should I start new thread? (same bug can be present in the FICP too)
Yes, this pxamci bothers me, it deserves a thread.

> I will try to configure an initrd rootfs this should create more ways to save
> kernel log.
Great idea.

>
> Anyway after mmc dma revert I was still not able to start FICP. There is an error:
>
> 	Unable to handle kernel paging request at virtual address 32e00004
>
> from pxa_irda_startup() and it seems it is caused by register definitions. For example:
>
> 	writel_relaxed((val), (irda)->stuart_base + (off));
>
> is called by
>
> 	stuart_writel(si, 0, STIER);
>
> but STIER is not just an offset, but full register address:
> 	
> 	__REG(0x40700004)
>
> So the definition should be changed, unless there is another patch I did not
> received (in that case, send me full patchset again please) :-).
Agreed, this is a bug in this patch. With this fix, is the pxaficp working or do
you need a bit more time to experiment ?

Cheers.

-- 
Robert

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 11.9.2015 v 08:18 Robert Jarzmik napsal(a):
> Petr Cvek <petr.cvek@tul.cz> writes:
> 
>>> Should have been posted to linux arm kernel mailing list, unless my mailer
>>> failed ...
>>>
>> Searching for:
>>
>> 	"ARM: pxa: add resources to pxaficp_ir"
>>
>> did not found anything, same was for "ficp" in the linux-arm-kernel/netdev/linux-kernel
>> mailing list archive.
> Ah ok, I'll resend it then.
> 
>>>> BTW This patch required update of my kernel repo. It seems that my:
>>>>
>>>> 	magician.c patches + ficp patch + new dma engine
>>>>
>>>> does not work for me at all. Kernel throws some panic about interrupts and then
>>>> it ends in an infinite stack dumping loop. Fault occurs before rootfs is
>>>> mounted, so probably around MMC init (with removed SD card it fails normally
>>>> with no rootfs found error).
>>> Could you send me (privately) the stack you're getting please. This is something
>>> I'd like to catch up early in the -rc releases.
>>
>> Well this will be problem as I cannot save anything to an SD card after and
>> during the failure.  Only viable interfaces would be earlycon on an infraport
>> or high speed camera on LCD :-).
> Ah just as on my mioa701. I ended up soldering a JTAG cable :)
Rather not :-D.

> 
>>> And it is true I have not tested the rootfs special case, where drivers are not
>>> yet initialized (and more specifically gpio and interrupt chip). Your backtrace
>>> should tell me if you fall into this category of issues ... but I digress, this
>>> has no link with pxaficp.
>>
>> Should I start new thread? (same bug can be present in the FICP too)
> Yes, this pxamci bothers me, it deserves a thread.

Will start soon.

>>
>> Anyway after mmc dma revert I was still not able to start FICP. There is an error:
>>
>> 	Unable to handle kernel paging request at virtual address 32e00004
>>
>> from pxa_irda_startup() and it seems it is caused by register definitions. For example:
>>
>> 	writel_relaxed((val), (irda)->stuart_base + (off));
>>
>> is called by
>>
>> 	stuart_writel(si, 0, STIER);
>>
>> but STIER is not just an offset, but full register address:
>> 	
>> 	__REG(0x40700004)
>>
>> So the definition should be changed, unless there is another patch I did not
>> received (in that case, send me full patchset again please) :-).
> Agreed, this is a bug in this patch. With this fix, is the pxaficp working or do
> you need a bit more time to experiment ?

I have tried with a nasty hack (use only lower part of address, it should equal with reg offset):
	#undef __REG
	-#define __REG(x) (x)
	+#define __REG(x) (x & 0xffff)

and it seems to work. The module inits and I am able to see IrDA traffic and ping other machine. FIR mode (mostly impacted by DMA) is still untested as magician unfortunately supports only SIR mode.

Petr

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Robert Jarzmik]

Petr Cvek <petr.cvek@tul.cz> writes:

>>>> And it is true I have not tested the rootfs special case, where drivers are not
>>>> yet initialized (and more specifically gpio and interrupt chip). Your backtrace
>>>> should tell me if you fall into this category of issues ... but I digress, this
>>>> has no link with pxaficp.
>>>
>>> Should I start new thread? (same bug can be present in the FICP too)
>> Yes, this pxamci bothers me, it deserves a thread.
>
> Will start soon.
And I think I see your problem now :
  (a) there is a regression from the commit 8c8fe97b2b8a, for which the fix is
  here: https://lkml.org/lkml/2015/9/6/112
  (b) for gpio expanders, another fix is here :
  https://lkml.org/lkml/2015/9/12/62

The regression is on dmaengine, that's where the thread belongs I think, at
least if that fixes your issue.

>>> but STIER is not just an offset, but full register address:
>>> 	
>>> 	__REG(0x40700004)
>>>
>>> So the definition should be changed, unless there is another patch I did not
>>> received (in that case, send me full patchset again please) :-).
>> Agreed, this is a bug in this patch. With this fix, is the pxaficp working or do
>> you need a bit more time to experiment ?
>
> I have tried with a nasty hack (use only lower part of address, it should equal with reg offset):
> 	#undef __REG
> 	-#define __REG(x) (x)
> 	+#define __REG(x) (x & 0xffff)
>
> and it seems to work. The module inits and I am able to see IrDA traffic and
> ping other machine. FIR mode (mostly impacted by DMA) is still untested as
> magician unfortunately supports only SIR mode.
Okay, I'll add a fix in the next iteration, thanks for finding this.

Cheers.

-- 
Robert

Re: [PATCH 2/3] net: irda: pxaficp_ir: convert to readl and writel

[Petr Cvek]

Dne 12.9.2015 v 13:03 Robert Jarzmik napsal(a):
> Petr Cvek <petr.cvek@tul.cz> writes:
> 
>>>>> And it is true I have not tested the rootfs special case, where drivers are not
>>>>> yet initialized (and more specifically gpio and interrupt chip). Your backtrace
>>>>> should tell me if you fall into this category of issues ... but I digress, this
>>>>> has no link with pxaficp.
>>>>
>>>> Should I start new thread? (same bug can be present in the FICP too)
>>> Yes, this pxamci bothers me, it deserves a thread.
>>
>> Will start soon.
> And I think I see your problem now :
>   (a) there is a regression from the commit 8c8fe97b2b8a, for which the fix is
>   here: https://lkml.org/lkml/2015/9/6/112
>   (b) for gpio expanders, another fix is here :
>   https://lkml.org/lkml/2015/9/12/62
> 
> The regression is on dmaengine, that's where the thread belongs I think, at
> least if that fixes your issue.
> 
Great now it finally boots. Thanks.

Petr