Unlike Intel Medfield and Tangier platforms DNV uses PCI BAR0 for IO compatible
resources and BAR1 for MMIO. We need latter in a way to support DMA. Introduce
an additional field in the internal structure and pass PCI BAR based on device
ID.
Reported-by: "Lai, Poey Seng" <poey.seng.lai@xxxxxxxxx>
Fixes: 6ede6dcd87aa ("serial: 8250_mid: add support for DMA engine handling from UART MMIO")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_mid.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 88531a3..7aa6ef8 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -14,6 +14,7 @@
#include <linux/pci.h>
#include <linux/dma/hsu.h>
+#include <linux/8250_pci.h>
#include "8250.h"
@@ -31,6 +32,7 @@
struct mid8250;
struct mid8250_board {
+ unsigned int flags;
unsigned long freq;
unsigned int base_baud;
int (*setup)(struct mid8250 *, struct uart_port *p);
@@ -106,12 +108,13 @@ 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);
+ unsigned int bar = FL_GET_BASE(mid->board->flags);
int ret;
chip->dev = &pdev->dev;
chip->irq = pdev->irq;
chip->regs = p->membase;
- chip->length = pci_resource_len(pdev, 0);
+ chip->length = pci_resource_len(pdev, bar);
chip->offset = DNV_DMA_CHAN_OFFSET;
/* Falling back to PIO mode if DMA probing fails */
@@ -217,6 +220,7 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct uart_8250_port uart;
struct mid8250 *mid;
+ unsigned int bar;
int ret;
ret = pcim_enable_device(pdev);
@@ -230,6 +234,7 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return -ENOMEM;
mid->board = (struct mid8250_board *)id->driver_data;
+ bar = FL_GET_BASE(mid->board->flags);
memset(&uart, 0, sizeof(struct uart_8250_port));
@@ -242,8 +247,8 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;
uart.port.set_termios = mid8250_set_termios;
- uart.port.mapbase = pci_resource_start(pdev, 0);
- uart.port.membase = pcim_iomap(pdev, 0, 0);
+ uart.port.mapbase = pci_resource_start(pdev, bar);
+ uart.port.membase = pcim_iomap(pdev, bar, 0);
if (!uart.port.membase)
return -ENOMEM;
@@ -282,18 +287,21 @@ static void mid8250_remove(struct pci_dev *pdev)
}
static const struct mid8250_board pnw_board = {
+ .flags = FL_BASE0,
.freq = 50000000,
.base_baud = 115200,
.setup = pnw_setup,
};
static const struct mid8250_board tng_board = {
+ .flags = FL_BASE0,
.freq = 38400000,
.base_baud = 1843200,
.setup = tng_setup,
};
static const struct mid8250_board dnv_board = {
+ .flags = FL_BASE1,
.freq = 133333333,
.base_baud = 115200,
.setup = dnv_setup,
--
2.8.0.rc3
--
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