[PATCH] ppc32 CPM_UART: Fixed odd address translations

Current address translation methods can produce wrong results, because
virt_to_bus and vice versa may not produce correct offsets on dma-allocated
memory. The right way is, while tracking both phys and virt address of the
window that has been allocated for boffer descriptors, and use those
numbers to compute the offset and make translation properly.

Signed-off-by: Vitaly Bordug <vbordug@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 50 insertions, 26 deletions

diff --git a/drivers/serial/cpm_uart/cpm_uart.h b/drivers/serial/cpm_uart/cpm_uart.h
index 17f2c7aa4503..aa5eb7ddeda9 100644
--- a/drivers/serial/cpm_uart/cpm_uart.h
+++ b/drivers/serial/cpm_uart/cpm_uart.h
@@ -66,6 +66,7 @@ struct uart_cpm_port {
 	uint			 dp_addr;
 	void			*mem_addr;
 	dma_addr_t		 dma_addr;
+	u32			mem_size;
 	/* helpers */
 	int			 baud;
 	int			 bits;
@@ -92,4 +93,36 @@ void scc2_lineif(struct uart_cpm_port *pinfo);
 void scc3_lineif(struct uart_cpm_port *pinfo);
 void scc4_lineif(struct uart_cpm_port *pinfo);
 
+/*
+   virtual to phys transtalion
+*/
+static inline unsigned long cpu2cpm_addr(void* addr, struct uart_cpm_port *pinfo)
+{
+	int offset;
+	u32 val = (u32)addr;
+	/* sane check */
+	if ((val >= (u32)pinfo->mem_addr) &&
+			(val<((u32)pinfo->mem_addr + pinfo->mem_size))) {
+		offset = val - (u32)pinfo->mem_addr;
+		return pinfo->dma_addr+offset;
+	}
+	printk("%s(): address %x to translate out of range!\n", __FUNCTION__, val);
+	return 0;
+}
+
+static inline void *cpm2cpu_addr(unsigned long addr, struct uart_cpm_port *pinfo)
+{
+	int offset;
+	u32 val = addr;
+	/* sane check */
+	if ((val >= pinfo->dma_addr) &&
+			(val<(pinfo->dma_addr + pinfo->mem_size))) {
+		offset = val - (u32)pinfo->dma_addr;
+		return (void*)(pinfo->mem_addr+offset);
+	}
+	printk("%s(): address %x to translate out of range!\n", __FUNCTION__, val);
+	return 0;
+}
+
+
 #endif /* CPM_UART_H */
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c
index 9a5b044ce068..ced193bf9e1e 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -72,19 +72,6 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo);
 
 /**************************************************************/
 
-static inline unsigned long cpu2cpm_addr(void *addr)
-{
-	if ((unsigned long)addr >= CPM_ADDR)
-		return (unsigned long)addr;
-	return virt_to_bus(addr);
-}
-
-static inline void *cpm2cpu_addr(unsigned long addr)
-{
-	if (addr >= CPM_ADDR)
-		return (void *)addr;
-	return bus_to_virt(addr);
-}
 
 /* Place-holder for board-specific stuff */
 struct platform_device* __attribute__ ((weak)) __init
@@ -290,7 +277,7 @@ static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs)
 		}
 
 		/* get pointer */
-		cp = cpm2cpu_addr(bdp->cbd_bufaddr);
+		cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 
 		/* loop through the buffer */
 		while (i-- > 0) {
@@ -633,7 +620,7 @@ static int cpm_uart_tx_pump(struct uart_port *port)
 		/* Pick next descriptor and fill from buffer */
 		bdp = pinfo->tx_cur;
 
-		p = cpm2cpu_addr(bdp->cbd_bufaddr);
+		p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 
 		*p++ = port->x_char;
 		bdp->cbd_datlen = 1;
@@ -660,7 +647,7 @@ static int cpm_uart_tx_pump(struct uart_port *port)
 
 	while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) {
 		count = 0;
-		p = cpm2cpu_addr(bdp->cbd_bufaddr);
+		p = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 		while (count < pinfo->tx_fifosize) {
 			*p++ = xmit->buf[xmit->tail];
 			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
@@ -709,12 +696,12 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
 	mem_addr = pinfo->mem_addr;
 	bdp = pinfo->rx_cur = pinfo->rx_bd_base;
 	for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) {
-		bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
+		bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 		bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT;
 		mem_addr += pinfo->rx_fifosize;
 	}
 
-	bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
+	bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 	bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT;
 
 	/* Set the physical address of the host memory
@@ -724,12 +711,12 @@ static void cpm_uart_initbd(struct uart_cpm_port *pinfo)
 	mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize);
 	bdp = pinfo->tx_cur = pinfo->tx_bd_base;
 	for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) {
-		bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
+		bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 		bdp->cbd_sc = BD_SC_INTRPT;
 		mem_addr += pinfo->tx_fifosize;
 	}
 
-	bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr);
+	bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr, pinfo);
 	bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT;
 }
 
@@ -1099,7 +1086,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
 		 * If the buffer address is in the CPM DPRAM, don't
 		 * convert it.
 		 */
-		cp = cpm2cpu_addr(bdp->cbd_bufaddr);
+		cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 
 		*cp = *s;
 
@@ -1116,7 +1103,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
 			while ((bdp->cbd_sc & BD_SC_READY) != 0)
 				;
 
-			cp = cpm2cpu_addr(bdp->cbd_bufaddr);
+			cp = cpm2cpu_addr(bdp->cbd_bufaddr, pinfo);
 
 			*cp = 13;
 			bdp->cbd_datlen = 1;
diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm1.c b/drivers/serial/cpm_uart/cpm_uart_cpm1.c
index 31223aa862f5..a5a30622637a 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm1.c
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm1.c
@@ -144,7 +144,7 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 		/* was hostalloc but changed cause it blows away the */
 		/* large tlb mapping when pinning the kernel area    */
 		mem_addr = (u8 *) cpm_dpram_addr(cpm_dpalloc(memsz, 8));
-		dma_addr = 0;
+		dma_addr = (u32)mem_addr;
 	} else
 		mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 					      GFP_KERNEL);
@@ -157,8 +157,9 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 	}
 
 	pinfo->dp_addr = dp_offset;
-	pinfo->mem_addr = mem_addr;
-	pinfo->dma_addr = dma_addr;
+	pinfo->mem_addr = mem_addr;             /*  virtual address*/
+	pinfo->dma_addr = dma_addr;             /*  physical address*/
+	pinfo->mem_size = memsz;
 
 	pinfo->rx_buf = mem_addr;
 	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos
diff --git a/drivers/serial/cpm_uart/cpm_uart_cpm2.c b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
index c9c3b1d8810b..7c6b07aeea92 100644
--- a/drivers/serial/cpm_uart/cpm_uart_cpm2.c
+++ b/drivers/serial/cpm_uart/cpm_uart_cpm2.c
@@ -209,8 +209,10 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 
 	memsz = L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize) +
 	    L1_CACHE_ALIGN(pinfo->tx_nrfifos * pinfo->tx_fifosize);
-	if (is_con)
+	if (is_con) {
 		mem_addr = alloc_bootmem(memsz);
+		dma_addr = mem_addr;
+	}
 	else
 		mem_addr = dma_alloc_coherent(NULL, memsz, &dma_addr,
 					      GFP_KERNEL);
@@ -225,6 +227,7 @@ int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con)
 	pinfo->dp_addr = dp_offset;
 	pinfo->mem_addr = mem_addr;
 	pinfo->dma_addr = dma_addr;
+	pinfo->mem_size = memsz;
 
 	pinfo->rx_buf = mem_addr;
 	pinfo->tx_buf = pinfo->rx_buf + L1_CACHE_ALIGN(pinfo->rx_nrfifos