serial: sirf: move to use generic dma dt-binding to get dma channels

instead of using sirf specific dma channel property like "sirf,uart-dma-rx-channel"
and "sirf,uart-dma-tx-channel", here we move to use generic dma dt-binding to get
the channel like:
- sirf,uart-dma-rx-channel = <21>;
- sirf,uart-dma-tx-channel = <2>;
+ dmas = <&dmac1 5>, <&dmac0 2>;
+ dma-names = "rx", "tx";

and we move dma_request_channel() to dma_request_slave_channel(), we don't need to
call sirfsoc dma filter function sirfsoc_dma_filter_id() again.

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 81 insertions, 156 deletions

diff --git a/arch/arm/boot/dts/atlas6.dtsi b/arch/arm/boot/dts/atlas6.dtsi
index f8674bcc4489..0c81dc945aed 100644
--- a/arch/arm/boot/dts/atlas6.dtsi
+++ b/arch/arm/boot/dts/atlas6.dtsi
@@ -217,8 +217,8 @@
                                 interrupts = <17>;
                                 fifosize = <128>;
                                 clocks = <&clks 13>;
-                                sirf,uart-dma-rx-channel = <21>;
-                                sirf,uart-dma-tx-channel = <2>;
+                                dmas = <&dmac1 5>, <&dmac0 2>;
+                                dma-names = "rx", "tx";
                         };
 
                         uart1: uart@b0060000 {
@@ -228,6 +228,7 @@
                                 interrupts = <18>;
                                 fifosize = <32>;
                                 clocks = <&clks 14>;
+                                dma-names = "no-rx", "no-tx";
                         };
 
                         uart2: uart@b0070000 {
@@ -237,8 +238,8 @@
                                 interrupts = <19>;
                                 fifosize = <128>;
                                 clocks = <&clks 15>;
-                                sirf,uart-dma-rx-channel = <6>;
-                                sirf,uart-dma-tx-channel = <7>;
+                                dmas = <&dmac0 6>, <&dmac0 7>;
+                                dma-names = "rx", "tx";
                         };
 
                         usp0: usp@b0080000 {
@@ -248,8 +249,8 @@
                                 interrupts = <20>;
                                 fifosize = <128>;
                                 clocks = <&clks 28>;
-                                sirf,usp-dma-rx-channel = <17>;
-                                sirf,usp-dma-tx-channel = <18>;
+                                dmas = <&dmac1 1>, <&dmac1 2>;
+                                dma-names = "rx", "tx";
                         };
 
                         usp1: usp@b0090000 {
@@ -259,8 +260,8 @@
                                 interrupts = <21>;
                                 fifosize = <128>;
                                 clocks = <&clks 29>;
-                                sirf,usp-dma-rx-channel = <14>;
-                                sirf,usp-dma-tx-channel = <15>;
+                                dmas = <&dmac0 14>, <&dmac0 15>;
+                                dma-names = "rx", "tx";
                         };
 
                         dmac0: dma-controller@b00b0000 {
diff --git a/arch/arm/boot/dts/prima2.dtsi b/arch/arm/boot/dts/prima2.dtsi
index 0e219932d7cc..8582ae41a583 100644
--- a/arch/arm/boot/dts/prima2.dtsi
+++ b/arch/arm/boot/dts/prima2.dtsi
@@ -223,8 +223,8 @@
                                 interrupts = <17>;
                                 fifosize = <128>;
                                 clocks = <&clks 13>;
-                                sirf,uart-dma-rx-channel = <21>;
-                                sirf,uart-dma-tx-channel = <2>;
+                                dmas = <&dmac1 5>, <&dmac0 2>;
+                                dma-names = "rx", "tx";
                         };
 
                         uart1: uart@b0060000 {
@@ -243,8 +243,8 @@
                                 interrupts = <19>;
                                 fifosize = <128>;
                                 clocks = <&clks 15>;
-                                sirf,uart-dma-rx-channel = <6>;
-                                sirf,uart-dma-tx-channel = <7>;
+                                dmas = <&dmac0 6>, <&dmac0 7>;
+                                dma-names = "rx", "tx";
                         };
 
                         usp0: usp@b0080000 {
@@ -254,8 +254,8 @@
                                 interrupts = <20>;
                                 fifosize = <128>;
                                 clocks = <&clks 28>;
-                                sirf,usp-dma-rx-channel = <17>;
-                                sirf,usp-dma-tx-channel = <18>;
+                                dmas = <&dmac1 1>, <&dmac1 2>;
+                                dma-names = "rx", "tx";
                         };
 
                         usp1: usp@b0090000 {
@@ -265,8 +265,8 @@
                                 interrupts = <21>;
                                 fifosize = <128>;
                                 clocks = <&clks 29>;
-                                sirf,usp-dma-rx-channel = <14>;
-                                sirf,usp-dma-tx-channel = <15>;
+                                dmas = <&dmac0 14>, <&dmac0 15>;
+                                dma-names = "rx", "tx";
                         };
 
                         usp2: usp@b00a0000 {
@@ -276,8 +276,8 @@
                                 interrupts = <22>;
                                 fifosize = <128>;
                                 clocks = <&clks 30>;
-                                sirf,usp-dma-rx-channel = <10>;
-                                sirf,usp-dma-tx-channel = <11>;
+                                dmas = <&dmac0 10>, <&dmac0 11>;
+                                dma-names = "rx", "tx";
                         };
 
                         dmac0: dma-controller@b00b0000 {
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index b7bfe24d4ebc..68b0fd4b9a6a 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -24,7 +24,6 @@
 #include <linux/dmaengine.h>
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
-#include <linux/sirfsoc_dma.h>
 #include <asm/irq.h>
 #include <asm/mach/irq.h>
 
@@ -173,7 +172,7 @@ static void sirfsoc_uart_stop_tx(struct uart_port *port)
         struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
 
-        if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
+        if (sirfport->tx_dma_chan) {
                 if (sirfport->tx_dma_state == TX_DMA_RUNNING) {
                         dmaengine_pause(sirfport->tx_dma_chan);
                         sirfport->tx_dma_state = TX_DMA_PAUSE;
@@ -288,7 +287,7 @@ static void sirfsoc_uart_start_tx(struct uart_port *port)
         struct sirfsoc_uart_port *sirfport = to_sirfport(port);
         struct sirfsoc_register *ureg = &sirfport->uart_reg->uart_reg;
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
-        if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+        if (sirfport->tx_dma_chan)
                 sirfsoc_uart_tx_with_dma(sirfport);
         else {
                 sirfsoc_uart_pio_tx_chars(sirfport, 1);
@@ -310,7 +309,7 @@ static void sirfsoc_uart_stop_rx(struct uart_port *port)
         struct sirfsoc_int_en *uint_en = &sirfport->uart_reg->uart_int_en;
 
         wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
+        if (sirfport->rx_dma_chan) {
                 if (!sirfport->is_marco)
                         wr_regl(port, ureg->sirfsoc_int_en_reg,
                                 rd_regl(port, ureg->sirfsoc_int_en_reg) &
@@ -675,7 +674,7 @@ recv_char:
                 uart_handle_cts_change(port, cts_status);
                 wake_up_interruptible(&state->port.delta_msr_wait);
         }
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
+        if (sirfport->rx_dma_chan) {
                 if (intr_status & uint_st->sirfsoc_rx_timeout)
                         sirfsoc_uart_handle_rx_tmo(sirfport);
                 if (intr_status & uint_st->sirfsoc_rx_done)
@@ -686,7 +685,7 @@ recv_char:
                                         SIRFSOC_UART_IO_RX_MAX_CNT);
         }
         if (intr_status & uint_st->sirfsoc_txfifo_empty) {
-                if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+                if (sirfport->tx_dma_chan)
                         sirfsoc_uart_tx_with_dma(sirfport);
                 else {
                         if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
@@ -778,7 +777,7 @@ static void sirfsoc_uart_start_rx(struct uart_port *port)
         wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_RESET);
         wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
         wr_regl(port, ureg->sirfsoc_rx_fifo_op, SIRFUART_FIFO_START);
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
+        if (sirfport->rx_dma_chan)
                 sirfsoc_uart_start_next_rx_dma(port);
         else {
                 if (!sirfport->is_marco)
@@ -1014,11 +1013,11 @@ static void sirfsoc_uart_set_termios(struct uart_port *port,
                         (sample_div_reg & SIRFSOC_USP_ASYNC_DIV2_MASK) <<
                         SIRFSOC_USP_ASYNC_DIV2_OFFSET);
         }
-        if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no))
+        if (sirfport->tx_dma_chan)
                 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_DMA_MODE);
         else
                 wr_regl(port, ureg->sirfsoc_tx_dma_io_ctrl, SIRFUART_IO_MODE);
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
+        if (sirfport->rx_dma_chan)
                 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_DMA_MODE);
         else
                 wr_regl(port, ureg->sirfsoc_rx_dma_io_ctrl, SIRFUART_IO_MODE);
@@ -1049,93 +1048,6 @@ static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
                 clk_disable_unprepare(sirfport->clk);
 }
 
-static unsigned int sirfsoc_uart_init_tx_dma(struct uart_port *port)
-{
-        struct sirfsoc_uart_port *sirfport = to_sirfport(port);
-        dma_cap_mask_t dma_mask;
-        struct dma_slave_config tx_slv_cfg = {
-                .dst_maxburst = 2,
-        };
-
-        dma_cap_zero(dma_mask);
-        dma_cap_set(DMA_SLAVE, dma_mask);
-        sirfport->tx_dma_chan = dma_request_channel(dma_mask,
-                (dma_filter_fn)sirfsoc_dma_filter_id,
-                (void *)sirfport->tx_dma_no);
-        if (!sirfport->tx_dma_chan) {
-                dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
-                                        sirfport->tx_dma_no);
-                return  -EPROBE_DEFER;
-        }
-        dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
-
-        return 0;
-}
-
-static unsigned int sirfsoc_uart_init_rx_dma(struct uart_port *port)
-{
-        struct sirfsoc_uart_port *sirfport = to_sirfport(port);
-        dma_cap_mask_t dma_mask;
-        int ret;
-        int i, j;
-        struct dma_slave_config slv_cfg = {
-                .src_maxburst = 2,
-        };
-
-        dma_cap_zero(dma_mask);
-        dma_cap_set(DMA_SLAVE, dma_mask);
-        sirfport->rx_dma_chan = dma_request_channel(dma_mask,
-                                        (dma_filter_fn)sirfsoc_dma_filter_id,
-                                        (void *)sirfport->rx_dma_no);
-        if (!sirfport->rx_dma_chan) {
-                dev_err(port->dev, "Uart Request Dma Channel Fail %d\n",
-                                sirfport->rx_dma_no);
-                ret = -EPROBE_DEFER;
-                goto request_err;
-        }
-        for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++) {
-                sirfport->rx_dma_items[i].xmit.buf =
-                        dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
-                        &sirfport->rx_dma_items[i].dma_addr, GFP_KERNEL);
-                if (!sirfport->rx_dma_items[i].xmit.buf) {
-                        dev_err(port->dev, "Uart alloc bufa failed\n");
-                        ret = -ENOMEM;
-                        goto alloc_coherent_err;
-                }
-                sirfport->rx_dma_items[i].xmit.head =
-                        sirfport->rx_dma_items[i].xmit.tail = 0;
-        }
-        dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
-
-        return 0;
-alloc_coherent_err:
-        for (j = 0; j < i; j++)
-                dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
-                                sirfport->rx_dma_items[j].xmit.buf,
-                                sirfport->rx_dma_items[j].dma_addr);
-        dma_release_channel(sirfport->rx_dma_chan);
-request_err:
-        return ret;
-}
-
-static void sirfsoc_uart_uninit_tx_dma(struct sirfsoc_uart_port *sirfport)
-{
-        dmaengine_terminate_all(sirfport->tx_dma_chan);
-        dma_release_channel(sirfport->tx_dma_chan);
-}
-
-static void sirfsoc_uart_uninit_rx_dma(struct sirfsoc_uart_port *sirfport)
-{
-        int i;
-        struct uart_port *port = &sirfport->port;
-        dmaengine_terminate_all(sirfport->rx_dma_chan);
-        dma_release_channel(sirfport->rx_dma_chan);
-        for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
-                dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
-                                sirfport->rx_dma_items[i].xmit.buf,
-                                sirfport->rx_dma_items[i].dma_addr);
-}
-
 static int sirfsoc_uart_startup(struct uart_port *port)
 {
         struct sirfsoc_uart_port *sirfport      = to_sirfport(port);
@@ -1174,18 +1086,12 @@ static int sirfsoc_uart_startup(struct uart_port *port)
         wr_regl(port, ureg->sirfsoc_rx_fifo_op, 0);
         wr_regl(port, ureg->sirfsoc_tx_fifo_ctrl, SIRFUART_FIFO_THD(port));
         wr_regl(port, ureg->sirfsoc_rx_fifo_ctrl, SIRFUART_FIFO_THD(port));
-
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no)) {
-                ret = sirfsoc_uart_init_rx_dma(port);
-                if (ret)
-                        goto init_rx_err;
+        if (sirfport->rx_dma_chan)
                 wr_regl(port, ureg->sirfsoc_rx_fifo_level_chk,
-                                SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) |
-                                SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) |
-                                SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b));
-        }
-        if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
-                sirfsoc_uart_init_tx_dma(port);
+                        SIRFUART_RX_FIFO_CHK_SC(port->line, 0x4) |
+                        SIRFUART_RX_FIFO_CHK_LC(port->line, 0xe) |
+                        SIRFUART_RX_FIFO_CHK_HC(port->line, 0x1b));
+        if (sirfport->tx_dma_chan) {
                 sirfport->tx_dma_state = TX_DMA_IDLE;
                 wr_regl(port, ureg->sirfsoc_tx_fifo_level_chk,
                                 SIRFUART_TX_FIFO_CHK_SC(port->line, 0x1b) |
@@ -1232,12 +1138,8 @@ static void sirfsoc_uart_shutdown(struct uart_port *port)
                 gpio_set_value(sirfport->rts_gpio, 1);
                 free_irq(gpio_to_irq(sirfport->cts_gpio), sirfport);
         }
-        if (IS_DMA_CHAN_VALID(sirfport->rx_dma_no))
-                sirfsoc_uart_uninit_rx_dma(sirfport);
-        if (IS_DMA_CHAN_VALID(sirfport->tx_dma_no)) {
-                sirfsoc_uart_uninit_tx_dma(sirfport);
+        if (sirfport->tx_dma_chan)
                 sirfport->tx_dma_state = TX_DMA_IDLE;
-        }
 }
 
 static const char *sirfsoc_uart_type(struct uart_port *port)
@@ -1313,8 +1215,8 @@ sirfsoc_uart_console_setup(struct console *co, char *options)
         port->cons = co;
 
         /* default console tx/rx transfer using io mode */
-        sirfport->rx_dma_no = UNVALID_DMA_CHAN;
-        sirfport->tx_dma_no = UNVALID_DMA_CHAN;
+        sirfport->rx_dma_chan = NULL;
+        sirfport->tx_dma_chan = NULL;
         return uart_set_options(port, co, baud, parity, bits, flow);
 }
 
@@ -1382,6 +1284,13 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
         struct uart_port *port;
         struct resource *res;
         int ret;
+        int i, j;
+        struct dma_slave_config slv_cfg = {
+                .src_maxburst = 2,
+        };
+        struct dma_slave_config tx_slv_cfg = {
+                .dst_maxburst = 2,
+        };
         const struct of_device_id *match;
 
         match = of_match_node(sirfsoc_uart_ids, pdev->dev.of_node);
@@ -1402,27 +1311,10 @@ static int sirfsoc_uart_probe(struct platform_device *pdev)
 
         sirfport->hw_flow_ctrl = of_property_read_bool(pdev->dev.of_node,
                 "sirf,uart-has-rtscts");
-        if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart")) {
+        if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-uart"))
                 sirfport->uart_reg->uart_type = SIRF_REAL_UART;
-                if (of_property_read_u32(pdev->dev.of_node,
-                                "sirf,uart-dma-rx-channel",
-                                &sirfport->rx_dma_no))
-                        sirfport->rx_dma_no = UNVALID_DMA_CHAN;
-                if (of_property_read_u32(pdev->dev.of_node,
-                                "sirf,uart-dma-tx-channel",
-                                &sirfport->tx_dma_no))
-                        sirfport->tx_dma_no = UNVALID_DMA_CHAN;
-        }
         if (of_device_is_compatible(pdev->dev.of_node, "sirf,prima2-usp-uart")) {
                 sirfport->uart_reg->uart_type = SIRF_USP_UART;
-                if (of_property_read_u32(pdev->dev.of_node,
-                                "sirf,usp-dma-rx-channel",
-                                &sirfport->rx_dma_no))
-                        sirfport->rx_dma_no = UNVALID_DMA_CHAN;
-                if (of_property_read_u32(pdev->dev.of_node,
-                                "sirf,usp-dma-tx-channel",
-                                &sirfport->tx_dma_no))
-                        sirfport->tx_dma_no = UNVALID_DMA_CHAN;
                 if (!sirfport->hw_flow_ctrl)
                         goto usp_no_flow_control;
                 if (of_find_property(pdev->dev.of_node, "cts-gpios", NULL))
@@ -1515,8 +1407,32 @@ usp_no_flow_control:
                 goto port_err;
         }
 
-        return 0;
+        sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx");
+        for (i = 0; sirfport->rx_dma_chan && i < SIRFSOC_RX_LOOP_BUF_CNT; i++) {
+                sirfport->rx_dma_items[i].xmit.buf =
+                        dma_alloc_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+                        &sirfport->rx_dma_items[i].dma_addr, GFP_KERNEL);
+                if (!sirfport->rx_dma_items[i].xmit.buf) {
+                        dev_err(port->dev, "Uart alloc bufa failed\n");
+                        ret = -ENOMEM;
+                        goto alloc_coherent_err;
+                }
+                sirfport->rx_dma_items[i].xmit.head =
+                        sirfport->rx_dma_items[i].xmit.tail = 0;
+        }
+        if (sirfport->rx_dma_chan)
+                dmaengine_slave_config(sirfport->rx_dma_chan, &slv_cfg);
+        sirfport->tx_dma_chan = dma_request_slave_channel(port->dev, "tx");
+        if (sirfport->tx_dma_chan)
+                dmaengine_slave_config(sirfport->tx_dma_chan, &tx_slv_cfg);
 
+        return 0;
+alloc_coherent_err:
+        for (j = 0; j < i; j++)
+                dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+                                sirfport->rx_dma_items[j].xmit.buf,
+                                sirfport->rx_dma_items[j].dma_addr);
+        dma_release_channel(sirfport->rx_dma_chan);
 port_err:
         clk_put(sirfport->clk);
 err:
@@ -1529,6 +1445,19 @@ static int sirfsoc_uart_remove(struct platform_device *pdev)
         struct uart_port *port = &sirfport->port;
         clk_put(sirfport->clk);
         uart_remove_one_port(&sirfsoc_uart_drv, port);
+        if (sirfport->rx_dma_chan) {
+                int i;
+                dmaengine_terminate_all(sirfport->rx_dma_chan);
+                dma_release_channel(sirfport->rx_dma_chan);
+                for (i = 0; i < SIRFSOC_RX_LOOP_BUF_CNT; i++)
+                        dma_free_coherent(port->dev, SIRFSOC_RX_DMA_BUF_SIZE,
+                                        sirfport->rx_dma_items[i].xmit.buf,
+                                        sirfport->rx_dma_items[i].dma_addr);
+        }
+        if (sirfport->tx_dma_chan) {
+                dmaengine_terminate_all(sirfport->tx_dma_chan);
+                dma_release_channel(sirfport->tx_dma_chan);
+        }
         return 0;
 }
 
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index b7d679c0881b..8a6eddad2f3c 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -392,9 +392,6 @@ struct sirfsoc_uart_register sirfsoc_uart = {
 /* Indicate how many buffers used */
 #define SIRFSOC_RX_LOOP_BUF_CNT         2
 
-/* Indicate if DMA channel valid */
-#define IS_DMA_CHAN_VALID(x)    ((x) != -1)
-#define UNVALID_DMA_CHAN        -1
 /* For Fast Baud Rate Calculation */
 struct sirfsoc_baudrate_to_regv {
         unsigned int baud_rate;
@@ -423,8 +420,6 @@ struct sirfsoc_uart_port {
         /* for SiRFmarco, there are SET/CLR for UART_INT_EN */
         bool                            is_marco;
         struct sirfsoc_uart_register    *uart_reg;
-        int                             rx_dma_no;
-        int                             tx_dma_no;
         struct dma_chan                 *rx_dma_chan;
         struct dma_chan                 *tx_dma_chan;
         dma_addr_t                      tx_dma_addr;