update spi driver

diff --git a/arch/arm/mach-rk29/board-malata.c b/arch/arm/mach-rk29/board-malata.c
old mode 100644 (file)
new mode 100755 (executable)
index 1e311dd..305db83
--- a/arch/arm/mach-rk29/board-malata.c
+++ b/arch/arm/mach-rk29/board-malata.c
@@ -1734,7 +1734,8 @@ static struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi0 cs0",
                .cs_gpio = RK29_PIN2_PC1,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C1_SPI0CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI0_CSN0,
        },
        {
                .name = "spi0 cs1",
@@ -1748,7 +1749,8 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi1 cs0",
                .cs_gpio = RK29_PIN2_PC5,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C5_SPI1CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI1_CSN0,
        },
        {
                .name = "spi1 cs1",
@@ -1761,22 +1763,10 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
 static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
 #if 1
-       int i,j,ret;
-
-       //cs
+       int i;
        if (cs_gpios) {
                for (i=0; i<cs_num; i++) {
                        rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);
-                       ret = gpio_request(cs_gpios[i].cs_gpio, cs_gpios[i].name);
-                       if (ret) {
-                               for (j=0;j<i;j++) {
-                                       gpio_free(cs_gpios[j].cs_gpio);
-                                       //rk29_mux_api_mode_resume(cs_gpios[j].cs_iomux_name);
-                               }
-                               printk("[fun:%s, line:%d], gpio request err\n", __func__, __LINE__);
-                               return -1;
-                       }
-                       gpio_direction_output(cs_gpios[i].cs_gpio, GPIO_HIGH);
                }
        }
 #endif
@@ -1785,16 +1775,6 @@ static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 
 static int spi_io_deinit(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
-#if 1
-       int i;
-
-       if (cs_gpios) {
-               for (i=0; i<cs_num; i++) {
-                       gpio_free(cs_gpios[i].cs_gpio);
-                       //rk29_mux_api_mode_resume(cs_gpios[i].cs_iomux_name);
-               }
-       }
-#endif
        return 0;
 }
 

diff --git a/arch/arm/mach-rk29/board-rk29-aigo.c b/arch/arm/mach-rk29/board-rk29-aigo.c
old mode 100644 (file)
new mode 100755 (executable)
index b9a93de..774bb15
--- a/arch/arm/mach-rk29/board-rk29-aigo.c
+++ b/arch/arm/mach-rk29/board-rk29-aigo.c
@@ -1559,11 +1559,12 @@ struct rk29_vmac_platform_data rk29_vmac_pdata = {
  * author: cmc@rock-chips.com\r
  *****************************************************************************************/\r
 #define SPI_CHIPSELECT_NUM 2\r
-struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {\r
+static struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {\r
     {\r
                .name = "spi0 cs0",\r
                .cs_gpio = RK29_PIN2_PC1,\r
-               .cs_iomux_name = NULL,\r
+               .cs_iomux_name = GPIO2C1_SPI0CSN0_NAME,\r
+               .cs_iomux_mode = GPIO2H_SPI0_CSN0,\r
        },\r
        {\r
                .name = "spi0 cs1",\r
@@ -1573,11 +1574,12 @@ struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
        }\r
 };\r
 \r
-struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {\r
+static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {\r
     {\r
                .name = "spi1 cs0",\r
                .cs_gpio = RK29_PIN2_PC5,\r
-               .cs_iomux_name = NULL,\r
+               .cs_iomux_name = GPIO2C5_SPI1CSN0_NAME,\r
+               .cs_iomux_mode = GPIO2H_SPI1_CSN0,\r
        },\r
        {\r
                .name = "spi1 cs1",\r
@@ -1590,22 +1592,10 @@ struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
 static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)\r
 {\r
 #if 1\r
-       int i,j,ret;\r
-\r
-       //cs\r
+       int i;\r
        if (cs_gpios) {\r
                for (i=0; i<cs_num; i++) {\r
                        rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);\r
-                       ret = gpio_request(cs_gpios[i].cs_gpio, cs_gpios[i].name);\r
-                       if (ret) {\r
-                               for (j=0;j<i;j++) {\r
-                                       gpio_free(cs_gpios[j].cs_gpio);\r
-                                       //rk29_mux_api_mode_resume(cs_gpios[j].cs_iomux_name);\r
-                               }\r
-                               printk("[fun:%s, line:%d], gpio request err\n", __func__, __LINE__);\r
-                               return -1;\r
-                       }\r
-                       gpio_direction_output(cs_gpios[i].cs_gpio, GPIO_HIGH);\r
                }\r
        }\r
 #endif\r
@@ -1614,16 +1604,6 @@ static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 \r
 static int spi_io_deinit(struct spi_cs_gpio *cs_gpios, int cs_num)\r
 {\r
-#if 1\r
-       int i;\r
-\r
-       if (cs_gpios) {\r
-               for (i=0; i<cs_num; i++) {\r
-                       gpio_free(cs_gpios[i].cs_gpio);\r
-                       //rk29_mux_api_mode_resume(cs_gpios[i].cs_iomux_name);\r
-               }\r
-       }\r
-#endif\r
        return 0;\r
 }\r
 \r

diff --git a/arch/arm/mach-rk29/board-rk29-phonesdk.c b/arch/arm/mach-rk29/board-rk29-phonesdk.c
index d8a69cdf4699a69b95b2d1704fb8485e8bd8f396..3cb3453a6ea151cd0bef7dc1d3d1e0f6ca242e27 100755 (executable)
--- a/arch/arm/mach-rk29/board-rk29-phonesdk.c
+++ b/arch/arm/mach-rk29/board-rk29-phonesdk.c
@@ -2483,7 +2483,8 @@ static struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi0 cs0",
                .cs_gpio = RK29_PIN2_PC1,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C1_SPI0CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI0_CSN0,
        },
        {
                .name = "spi0 cs1",
@@ -2497,7 +2498,8 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi1 cs0",
                .cs_gpio = RK29_PIN2_PC5,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C5_SPI1CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI1_CSN0,
        },
        {
                .name = "spi1 cs1",
@@ -2510,40 +2512,18 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
 static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
 #if 1
-       int i,j,ret;
-
-       //cs
-       if (cs_gpios) {
-               for (i=0; i<cs_num; i++) {
-                       rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);
-                       ret = gpio_request(cs_gpios[i].cs_gpio, cs_gpios[i].name);
-                       if (ret) {
-                               for (j=0;j<i;j++) {
-                                       gpio_free(cs_gpios[j].cs_gpio);
-                                       //rk29_mux_api_mode_resume(cs_gpios[j].cs_iomux_name);
-                               }
-                               printk("[fun:%s, line:%d], gpio request err\n", __func__, __LINE__);
-                               return -1;
+               int i;
+               if (cs_gpios) {
+                       for (i=0; i<cs_num; i++) {
+                               rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);
                        }
-                       gpio_direction_output(cs_gpios[i].cs_gpio, GPIO_HIGH);
                }
-       }
 #endif
        return 0;
 }
 
 static int spi_io_deinit(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
-#if 1
-       int i;
-
-       if (cs_gpios) {
-               for (i=0; i<cs_num; i++) {
-                       gpio_free(cs_gpios[i].cs_gpio);
-                       //rk29_mux_api_mode_resume(cs_gpios[i].cs_iomux_name);
-               }
-       }
-#endif
        return 0;
 }
 

diff --git a/arch/arm/mach-rk29/board-rk29-winaccord.c b/arch/arm/mach-rk29/board-rk29-winaccord.c
old mode 100644 (file)
new mode 100755 (executable)
index b1ba8e6..3eb9520
--- a/arch/arm/mach-rk29/board-rk29-winaccord.c
+++ b/arch/arm/mach-rk29/board-rk29-winaccord.c
@@ -1476,11 +1476,12 @@ struct rk29_vmac_platform_data rk29_vmac_pdata = {
  * author: cmc@rock-chips.com
  *****************************************************************************************/
 #define SPI_CHIPSELECT_NUM 2
-struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
+static struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi0 cs0",
                .cs_gpio = RK29_PIN2_PC1,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C1_SPI0CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI0_CSN0,
        },
        {
                .name = "spi0 cs1",
@@ -1490,11 +1491,12 @@ struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
        }
 };
 
-struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
+static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi1 cs0",
                .cs_gpio = RK29_PIN2_PC5,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C5_SPI1CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI1_CSN0,
        },
        {
                .name = "spi1 cs1",
@@ -1507,22 +1509,10 @@ struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
 static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
 #if 1
-       int i,j,ret;
-
-       //cs
+       int i;
        if (cs_gpios) {
                for (i=0; i<cs_num; i++) {
                        rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);
-                       ret = gpio_request(cs_gpios[i].cs_gpio, cs_gpios[i].name);
-                       if (ret) {
-                               for (j=0;j<i;j++) {
-                                       gpio_free(cs_gpios[j].cs_gpio);
-                                       //rk29_mux_api_mode_resume(cs_gpios[j].cs_iomux_name);
-                               }
-                               printk("[fun:%s, line:%d], gpio request err\n", __func__, __LINE__);
-                               return -1;
-                       }
-                       gpio_direction_output(cs_gpios[i].cs_gpio, GPIO_HIGH);
                }
        }
 #endif
@@ -1531,16 +1521,6 @@ static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 
 static int spi_io_deinit(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
-#if 1
-       int i;
-
-       if (cs_gpios) {
-               for (i=0; i<cs_num; i++) {
-                       gpio_free(cs_gpios[i].cs_gpio);
-                       //rk29_mux_api_mode_resume(cs_gpios[i].cs_iomux_name);
-               }
-       }
-#endif
        return 0;
 }
 

diff --git a/arch/arm/mach-rk29/board-rk29sdk.c b/arch/arm/mach-rk29/board-rk29sdk.c
index 145b04edbd5884618efc548a7b67b475c731cc47..183dc28ace83ffe8661a89b064e58961f96866dd 100755 (executable)
--- a/arch/arm/mach-rk29/board-rk29sdk.c
+++ b/arch/arm/mach-rk29/board-rk29sdk.c
@@ -1679,7 +1679,8 @@ static struct spi_cs_gpio rk29xx_spi0_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi0 cs0",
                .cs_gpio = RK29_PIN2_PC1,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C1_SPI0CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI0_CSN0,
        },
        {
                .name = "spi0 cs1",
@@ -1693,7 +1694,8 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
     {
                .name = "spi1 cs0",
                .cs_gpio = RK29_PIN2_PC5,
-               .cs_iomux_name = NULL,
+               .cs_iomux_name = GPIO2C5_SPI1CSN0_NAME,
+               .cs_iomux_mode = GPIO2H_SPI1_CSN0,
        },
        {
                .name = "spi1 cs1",
@@ -1706,22 +1708,10 @@ static struct spi_cs_gpio rk29xx_spi1_cs_gpios[SPI_CHIPSELECT_NUM] = {
 static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
 #if 1
-       int i,j,ret;
-
-       //cs
+       int i;
        if (cs_gpios) {
                for (i=0; i<cs_num; i++) {
                        rk29_mux_api_set(cs_gpios[i].cs_iomux_name, cs_gpios[i].cs_iomux_mode);
-                       ret = gpio_request(cs_gpios[i].cs_gpio, cs_gpios[i].name);
-                       if (ret) {
-                               for (j=0;j<i;j++) {
-                                       gpio_free(cs_gpios[j].cs_gpio);
-                                       //rk29_mux_api_mode_resume(cs_gpios[j].cs_iomux_name);
-                               }
-                               printk("[fun:%s, line:%d], gpio request err\n", __func__, __LINE__);
-                               return -1;
-                       }
-                       gpio_direction_output(cs_gpios[i].cs_gpio, GPIO_HIGH);
                }
        }
 #endif
@@ -1730,16 +1720,6 @@ static int spi_io_init(struct spi_cs_gpio *cs_gpios, int cs_num)
 
 static int spi_io_deinit(struct spi_cs_gpio *cs_gpios, int cs_num)
 {
-#if 1
-       int i;
-
-       if (cs_gpios) {
-               for (i=0; i<cs_num; i++) {
-                       gpio_free(cs_gpios[i].cs_gpio);
-                       //rk29_mux_api_mode_resume(cs_gpios[i].cs_iomux_name);
-               }
-       }
-#endif
        return 0;
 }
 

diff --git a/drivers/spi/rk29_spim.c b/drivers/spi/rk29_spim.c
index c706987e12cc63f81604bd64bd37c03a6c123c58..e940e37550eccfe0b24db55a5fdfc4f689d246f6 100755 (executable)
--- a/drivers/spi/rk29_spim.c
+++ b/drivers/spi/rk29_spim.c
@@ -89,24 +89,24 @@ struct chip_data {
 #define TXBUSY    (1<<3)\r
 \r
 static void spi_dump_regs(struct rk29xx_spi *dws) {\r
-       printk("MRST SPI0 registers:\n");\r
-       printk("=================================\n");\r
-       printk("CTRL0: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_CTRLR0));\r
-       printk("CTRL1: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_CTRLR1));\r
-       printk("SSIENR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_ENR));\r
-       printk("SER: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_SER));\r
-       printk("BAUDR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_BAUDR));\r
-       printk("TXFTLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_TXFTLR));\r
-       printk("RXFTLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_RXFTLR));\r
-       printk("TXFLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_TXFLR));\r
-       printk("RXFLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_RXFLR));\r
-       printk("SR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_SR));\r
-       printk("IMR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_IMR));\r
-       printk("ISR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_ISR));\r
-       printk("DMACR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_DMACR));\r
-       printk("DMATDLR: \t0x%08x\n", rk29xx_readl(dws, SPIM_DMATDLR));\r
-       printk("DMARDLR: \t0x%08x\n", rk29xx_readl(dws, SPIM_DMARDLR));\r
-       printk("=================================\n");\r
+       DBG("MRST SPI0 registers:\n");\r
+       DBG("=================================\n");\r
+       DBG("CTRL0: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_CTRLR0));\r
+       DBG("CTRL1: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_CTRLR1));\r
+       DBG("SSIENR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_ENR));\r
+       DBG("SER: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_SER));\r
+       DBG("BAUDR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_BAUDR));\r
+       DBG("TXFTLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_TXFTLR));\r
+       DBG("RXFTLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_RXFTLR));\r
+       DBG("TXFLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_TXFLR));\r
+       DBG("RXFLR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_RXFLR));\r
+       DBG("SR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_SR));\r
+       DBG("IMR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_IMR));\r
+       DBG("ISR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_ISR));\r
+       DBG("DMACR: \t\t0x%08x\n", rk29xx_readl(dws, SPIM_DMACR));\r
+       DBG("DMATDLR: \t0x%08x\n", rk29xx_readl(dws, SPIM_DMATDLR));\r
+       DBG("DMARDLR: \t0x%08x\n", rk29xx_readl(dws, SPIM_DMARDLR));\r
+       DBG("=================================\n");\r
 \r
 }\r
 \r
@@ -245,15 +245,21 @@ static void flush(struct rk29xx_spi *dws)
 static void spi_cs_control(struct rk29xx_spi *dws, u32 cs, u8 flag)\r
 {\r
        #if 1\r
-           return;\r
+       if (flag)\r
+               rk29xx_writel(dws, SPIM_SER, 1 << cs);\r
+       else            \r
+               rk29xx_writel(dws, SPIM_SER, 0);\r
+       return;\r
        #else\r
        struct rk29xx_spi_platform_data *pdata = dws->master->dev.platform_data;\r
        struct spi_cs_gpio *cs_gpios = pdata->chipselect_gpios;\r
 \r
-       if (flag == 0)\r
+       if (flag == 0) {\r
                gpio_direction_output(cs_gpios[cs].cs_gpio, GPIO_HIGH);\r
-       else\r
+       }\r
+       else {\r
                gpio_direction_output(cs_gpios[cs].cs_gpio, GPIO_LOW);\r
+       }\r
        #endif\r
 }\r
 \r
@@ -1007,17 +1013,20 @@ static void dma_transfer(struct rk29xx_spi *dws) //int cs_change)
        DBG("dws->tx_dmach: %d, dws->rx_dmach: %d, transfer->tx_dma: 0x%x\n", dws->tx_dmach, dws->rx_dmach, (unsigned int)transfer->tx_dma);\r
        if (transfer->tx_buf != NULL) {\r
                dws->state |= TXBUSY;\r
-               if (transfer->len & 0x3) {\r
+               /*if (transfer->len & 0x3) {\r
                        burst = 1;\r
                }\r
                else {\r
                        burst = 4;\r
                }\r
-               if (rk29_dma_config(dws->tx_dmach, burst)) {\r
+               if (rk29_dma_config(dws->tx_dmach, burst)) {*/\r
+               if (rk29_dma_config(dws->tx_dmach, 1)) {//there is not dma burst but bitwide, set it 1 alwayss\r
                        dev_err(&dws->master->dev, "function: %s, line: %d\n", __FUNCTION__, __LINE__);\r
                        goto err_out;\r
                }\r
                \r
+               rk29_dma_ctrl(dws->tx_dmach, RK29_DMAOP_FLUSH); \r
+               \r
                iRet = rk29_dma_enqueue(dws->tx_dmach, (void *)dws,\r
                                        transfer->tx_dma, transfer->len);\r
                if (iRet) {\r
@@ -1032,12 +1041,16 @@ static void dma_transfer(struct rk29xx_spi *dws) //int cs_change)
                }\r
        }\r
 \r
+       wait_till_not_busy(dws);\r
+\r
        if (transfer->rx_buf != NULL) {\r
                dws->state |= RXBUSY;\r
                if (rk29_dma_config(dws->rx_dmach, 1)) {\r
                        dev_err(&dws->master->dev, "function: %s, line: %d\n", __FUNCTION__, __LINE__);\r
                        goto err_out;\r
                }\r
+\r
+               rk29_dma_ctrl(dws->rx_dmach, RK29_DMAOP_FLUSH); \r
                \r
                iRet = rk29_dma_enqueue(dws->rx_dmach, (void *)dws,\r
                                        transfer->rx_dma, transfer->len);\r

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
old mode 100644 (file)
new mode 100755 (executable)
index 1d3ba25..e029cb5
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -834,6 +834,7 @@ int spi_write_then_read(struct spi_device *spi,
        } else
                local_buf = buf;
 
+       memset(local_buf, 0, SPI_BUFSIZ);
        memcpy(local_buf, txbuf, n_tx);
        x[0].tx_buf = local_buf;
        x[1].rx_buf = local_buf + n_tx;