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serial: 8250_mid: add support for DMA engine handling from UART MMIO

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The platforms that have this UART, but that don't have
separate PCI device for the DMA Engine, need to create the
HSU DMA Engine device separately.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2015-10-13 13:29:06 +03:00 committed by Greg Kroah-Hartman
parent 4c97ad993d
commit 6ede6dcd87
2 changed files with 71 additions and 2 deletions
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72
drivers/tty/serial/8250/8250_mid.c
View File

@ -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);

1
drivers/tty/serial/8250/8250_pci.c
View File

@ -3809,6 +3809,7 @@ static const struct pci_device_id blacklist[] = {
{ PCI_VDEVICE(INTEL, 0x081c), },
{ PCI_VDEVICE(INTEL, 0x081d), },
{ PCI_VDEVICE(INTEL, 0x1191), },
{ PCI_VDEVICE(INTEL, 0x19d8), },
};
/*