diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_mid.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_mid.c | 72 |
1 files changed, 70 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index 61f604c..88531a3 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -21,6 +21,7 @@ #define PCI_DEVICE_ID_INTEL_PNW_UART2 0x081c #define PCI_DEVICE_ID_INTEL_PNW_UART3 0x081d #define PCI_DEVICE_ID_INTEL_TNG_UART 0x1191 +#define PCI_DEVICE_ID_INTEL_DNV_UART 0x19d8 /* Intel MID Specific registers */ #define INTEL_MID_UART_PS 0x30 @@ -33,6 +34,7 @@ struct mid8250_board { unsigned long freq; unsigned int base_baud; int (*setup)(struct mid8250 *, struct uart_port *p); + void (*exit)(struct mid8250 *); }; struct mid8250 { @@ -41,6 +43,7 @@ struct mid8250 { struct pci_dev *dma_dev; struct uart_8250_dma dma; struct mid8250_board *board; + struct hsu_dma_chip dma_chip; }; /*****************************************************************************/ @@ -82,6 +85,53 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p) return 0; } +static int dnv_handle_irq(struct uart_port *p) +{ + struct mid8250 *mid = p->private_data; + int ret; + + ret = hsu_dma_irq(&mid->dma_chip, 0); + ret |= hsu_dma_irq(&mid->dma_chip, 1); + + /* For now, letting the HW generate separate interrupt for the UART */ + if (ret) + return ret; + + return serial8250_handle_irq(p, serial_port_in(p, UART_IIR)); +} + +#define DNV_DMA_CHAN_OFFSET 0x80 + +static int dnv_setup(struct mid8250 *mid, struct uart_port *p) +{ + struct hsu_dma_chip *chip = &mid->dma_chip; + struct pci_dev *pdev = to_pci_dev(p->dev); + int ret; + + chip->dev = &pdev->dev; + chip->irq = pdev->irq; + chip->regs = p->membase; + chip->length = pci_resource_len(pdev, 0); + chip->offset = DNV_DMA_CHAN_OFFSET; + + /* Falling back to PIO mode if DMA probing fails */ + ret = hsu_dma_probe(chip); + if (ret) + return 0; + + mid->dma_dev = pdev; + + p->handle_irq = dnv_handle_irq; + return 0; +} + +static void dnv_exit(struct mid8250 *mid) +{ + if (!mid->dma_dev) + return; + hsu_dma_remove(&mid->dma_chip); +} + /*****************************************************************************/ static void mid8250_set_termios(struct uart_port *p, @@ -135,6 +185,9 @@ static int mid8250_dma_setup(struct mid8250 *mid, struct uart_8250_port *port) struct hsu_dma_slave *rx_param; struct hsu_dma_slave *tx_param; + if (!mid->dma_dev) + return 0; + rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL); if (!rx_param) return -ENOMEM; @@ -202,22 +255,29 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id) ret = mid8250_dma_setup(mid, &uart); if (ret) - return ret; + goto err; ret = serial8250_register_8250_port(&uart); if (ret < 0) - return ret; + goto err; mid->line = ret; pci_set_drvdata(pdev, mid); return 0; +err: + if (mid->board->exit) + mid->board->exit(mid); + return ret; } static void mid8250_remove(struct pci_dev *pdev) { struct mid8250 *mid = pci_get_drvdata(pdev); + if (mid->board->exit) + mid->board->exit(mid); + serial8250_unregister_port(mid->line); } @@ -233,6 +293,13 @@ static const struct mid8250_board tng_board = { .setup = tng_setup, }; +static const struct mid8250_board dnv_board = { + .freq = 133333333, + .base_baud = 115200, + .setup = dnv_setup, + .exit = dnv_exit, +}; + #define MID_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board } static const struct pci_device_id pci_ids[] = { @@ -240,6 +307,7 @@ static const struct pci_device_id pci_ids[] = { MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART2, pnw_board), MID_DEVICE(PCI_DEVICE_ID_INTEL_PNW_UART3, pnw_board), MID_DEVICE(PCI_DEVICE_ID_INTEL_TNG_UART, tng_board), + MID_DEVICE(PCI_DEVICE_ID_INTEL_DNV_UART, dnv_board), { }, }; MODULE_DEVICE_TABLE(pci, pci_ids); |