[PATCH 1/1] serial: 8250_pci: Fix real serial port count for F81504/508/512
From: Peter Hung
Date: Tue Dec 01 2015 - 01:51:50 EST
Fix real serial port count for F81504/508/512 with multi-function mode.
Fintek F81504/508/512 are multi-function boards. It could be configurated
via PCI configuration space register F0h/F3h with external EEPROM that
programmed by customer.
F0h bit0~5: Enable GPIO0~5
bit6~7: Reserve
F3h bit0~5: Multi-Functional Flag (0:GPIO/1:UART)
bit0: UART2 pin out for UART2 / GPIO0
bit1: UART3 pin out for UART3 / GPIO1
bit2: UART8 pin out for UART8 / GPIO2
bit3: UART9 pin out for UART9 / GPIO3
bit4: UART10 pin out for UART10 / GPIO4
bit5: UART11 pin out for UART11 / GPIO5
bit6~7: Reserve
It'll use (F0h & ~F3h) & 0x3f union set to find max set of GPIOs.
If a port is indicated as GPIO, it'll not report as serial port and reserve
for userspace to manipulate.
F81504: Max for 4 serial ports.
UART2/3 is multi-function.
F81508: Max for 8 serial ports.
UART2/3 is multi-function.
8/9/10/11 is GPIO only
F81512: Max for 12 serial ports.
UART2/3/8/9/10/11 is multi-function.
Signed-off-by: Peter Hung <hpeter+linux_kernel@xxxxxxxxx>
---
drivers/tty/serial/8250/8250_pci.c | 114 +++++++++++++++++++++++++++++++++++--
1 file changed, 108 insertions(+), 6 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 4097f3f..8a639cb 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1532,6 +1532,9 @@ pci_brcm_trumanage_setup(struct serial_private *priv,
/* only worked with FINTEK_RTS_CONTROL_BY_HW on */
#define FINTEK_RTS_INVERT BIT(5)
+/* The device is multi-function with UART & GPIO */
+static u8 fintek_gpio_mapping[] = {2, 3, 8, 9, 10, 11};
+
/* We should do proper H/W transceiver setting before change to RS485 mode */
static int pci_fintek_rs485_config(struct uart_port *port,
struct serial_rs485 *rs485)
@@ -1586,10 +1589,41 @@ static int pci_fintek_setup(struct serial_private *priv,
{
struct pci_dev *pdev = priv->dev;
u8 *data;
- u8 config_base;
- u16 iobase;
+ u8 tmp;
+ u8 config_base = 0;
+ u16 iobase, i, max_port, count = 0;
- config_base = 0x40 + 0x08 * idx;
+ switch (pdev->device) {
+ case 0x1104: /* 4 ports */
+ case 0x1108: /* 8 ports */
+ max_port = pdev->device & 0xff;
+ break;
+ case 0x1112: /* 12 ports */
+ max_port = 12;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* find real serial port index from logic idx */
+ for (i = 0; i < max_port; ++i) {
+ config_base = 0x40 + 0x08 * i;
+
+ pci_read_config_byte(pdev, config_base, &tmp);
+ if (!tmp)
+ continue;
+
+ if (count == idx)
+ break;
+
+ ++count;
+ }
+
+ if (i >= max_port) {
+ dev_err(&pdev->dev, "%s: mapping error! i=%d, idx=%d\n",
+ __func__, i, idx);
+ return -ENODEV;
+ }
/* Get the io address from configuration space */
pci_read_config_word(pdev, config_base + 4, &iobase);
@@ -1604,8 +1638,8 @@ static int pci_fintek_setup(struct serial_private *priv,
if (!data)
return -ENOMEM;
- /* preserve index in PCI configuration space */
- *data = idx;
+ /* preserve real index in PCI configuration space */
+ *data = i;
port->port.private_data = data;
return 0;
@@ -1614,12 +1648,40 @@ static int pci_fintek_setup(struct serial_private *priv,
static int pci_fintek_init(struct pci_dev *dev)
{
unsigned long iobase;
- u32 max_port, i;
+ u32 max_port, i, j;
u32 bar_data[3];
u8 config_base;
+ u8 tmp, f0h_data, f3h_data;
+ bool skip_init;
struct serial_private *priv = pci_get_drvdata(dev);
struct uart_8250_port *port;
+ /*
+ * The PCI board is multi-function, some serial port can converts to
+ * GPIO function. Customers could changes the F0/F3h values in EEPROM
+ *
+ * F0h bit0~5: Enable GPIO0~5
+ * bit6~7: Reserve
+ *
+ * F3h bit0~5: Multi-Functional Flag (0:GPIO/1:UART)
+ * bit0: UART2 pin out for UART2 / GPIO0
+ * bit1: UART3 pin out for UART3 / GPIO1
+ * bit2: UART8 pin out for UART8 / GPIO2
+ * bit3: UART9 pin out for UART9 / GPIO3
+ * bit4: UART10 pin out for UART10 / GPIO4
+ * bit5: UART11 pin out for UART11 / GPIO5
+ * bit6~7: Reserve
+ */
+ pci_read_config_byte(dev, 0xf0, &f0h_data);
+ pci_read_config_byte(dev, 0xf3, &f3h_data);
+
+ /* find the max set of GPIOs */
+ tmp = f0h_data | ~f3h_data;
+
+ /* rewrite GPIO setting */
+ pci_write_config_byte(dev, 0xf0, tmp & 0x3f);
+ pci_write_config_byte(dev, 0xf3, ~tmp & 0x3f);
+
switch (dev->device) {
case 0x1104: /* 4 ports */
case 0x1108: /* 8 ports */
@@ -1641,6 +1703,32 @@ static int pci_fintek_init(struct pci_dev *dev)
/* UART0 configuration offset start from 0x40 */
config_base = 0x40 + 0x08 * i;
+ skip_init = false;
+
+ /* find every port to check is multi-function port? */
+ for (j = 0; j < ARRAY_SIZE(fintek_gpio_mapping); ++j) {
+ if (fintek_gpio_mapping[j] != i || !(tmp & BIT(j)))
+ continue;
+
+ /*
+ * This port is multi-function and enabled as gpio
+ * mode. So we'll not configure it as serial port.
+ */
+ skip_init = true;
+ break;
+ }
+
+ /*
+ * If the serial port is setting to gpio mode, don't init it.
+ * Disable the serial port for user-space application to
+ * control.
+ */
+ if (skip_init) {
+ /* Disable current serial port */
+ pci_write_config_byte(dev, config_base + 0x00, 0x00);
+ continue;
+ }
+
/* Calculate Real IO Port */
iobase = (bar_data[i / 4] & 0xffffffe0) + (i % 4) * 8;
@@ -1674,6 +1762,20 @@ static int pci_fintek_init(struct pci_dev *dev)
}
}
+ /* Calculate real serial port number */
+ for (i = 0; i < ARRAY_SIZE(fintek_gpio_mapping); ++i) {
+ switch (dev->device) {
+ case 0x1104: /* 4 ports */
+ case 0x1108: /* 8 ports */
+ if (i >= 2) /* Ignore all bits higher than 0 & 1 */
+ break;
+ case 0x1112: /* 12 ports */
+ if (tmp & BIT(i))
+ --max_port;
+ break;
+ }
+ }
+
return max_port;
}
--
1.9.1
--
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