Blackfin Serial Driver: Fix bug - request UART2/3 peripheral mapped interrupts in PIO mode
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -117,15 +117,14 @@ int request_dma(unsigned int channel, char *device_id)
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#ifdef CONFIG_BF54x
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if (channel >= CH_UART2_RX && channel <= CH_UART3_TX) {
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if (strncmp(device_id, "BFIN_UART", 9) == 0) {
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dma_ch[channel].regs->peripheral_map &= 0x0FFF;
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dma_ch[channel].regs->peripheral_map |=
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unsigned int per_map;
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per_map = dma_ch[channel].regs->peripheral_map & 0xFFF;
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if (strncmp(device_id, "BFIN_UART", 9) == 0)
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dma_ch[channel].regs->peripheral_map = per_map |
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((channel - CH_UART2_RX + 0xC)<<12);
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} else {
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dma_ch[channel].regs->peripheral_map &= 0x0FFF;
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dma_ch[channel].regs->peripheral_map |=
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else
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dma_ch[channel].regs->peripheral_map = per_map |
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((channel - CH_UART2_RX + 0x6)<<12);
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}
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}
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#endif
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@ -649,6 +649,42 @@ static int bfin_serial_startup(struct uart_port *port)
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free_irq(uart->port.irq, uart);
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return -EBUSY;
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}
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# ifdef CONFIG_BF54x
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{
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unsigned uart_dma_ch_rx, uart_dma_ch_tx;
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switch (uart->port.irq) {
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case IRQ_UART3_RX:
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uart_dma_ch_rx = CH_UART3_RX;
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uart_dma_ch_tx = CH_UART3_TX;
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break;
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case IRQ_UART2_RX:
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uart_dma_ch_rx = CH_UART2_RX;
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uart_dma_ch_tx = CH_UART2_TX;
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break;
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default:
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uart_dma_ch_rx = uart_dma_ch_tx = 0;
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break;
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};
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if (uart_dma_ch_rx &&
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request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
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printk(KERN_NOTICE"Fail to attach UART interrupt\n");
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free_irq(uart->port.irq, uart);
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free_irq(uart->port.irq + 1, uart);
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return -EBUSY;
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}
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if (uart_dma_ch_tx &&
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request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
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printk(KERN_NOTICE "Fail to attach UART interrupt\n");
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free_dma(uart_dma_ch_rx);
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free_irq(uart->port.irq, uart);
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free_irq(uart->port.irq + 1, uart);
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return -EBUSY;
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}
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}
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# endif
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#endif
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UART_SET_IER(uart, ERBFI);
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return 0;
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@ -666,6 +702,20 @@ static void bfin_serial_shutdown(struct uart_port *port)
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del_timer(&(uart->rx_dma_timer));
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dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
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#else
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#ifdef CONFIG_BF54x
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switch (uart->port.irq) {
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case IRQ_UART3_RX:
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free_dma(CH_UART3_RX);
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free_dma(CH_UART3_TX);
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break;
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case IRQ_UART2_RX:
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free_dma(CH_UART2_RX);
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free_dma(CH_UART2_TX);
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break;
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default:
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break;
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};
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#endif
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#ifdef CONFIG_KGDB_UART
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if (uart->port.line != CONFIG_KGDB_UART_PORT)
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#endif
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