[PATCH v4 6/7] serial: exar: add CTI specific setup code

Parker Newman
2024-04-17T20:32:07Z

From: Parker Newman <pnewman@connecttech.com>

This is a large patch but is only additions. All changes and removals
are made in previous patches in this series.

- Add CTI board_init and port setup functions for each UART type
- Add CTI_EXAR_DEVICE() and CTI_PCI_DEVICE() macros
- Add support for reading a word from the Exar EEPROM.
- Add support for configuring and setting a single MPIO
- Add various helper functions for CTI boards.
- Add osc_freq to struct exar8250

Signed-off-by: Parker Newman <pnewman@connecttech.com>
---
Changes in v3:
- Moved all base driver changes and refactoring to preparatory patches
- Switched any user space types to kernel types
- Switched all uses of pci_xxx print functions to dev_xxx
- Added struct device pointer in struct exar8250 to simplify above
- Switched osc_freq and port_flag parsing to use GENMASK() and
FIELD_GET()/FIELD_PREP()
- Renamed board_setup function pointer to board_init
- Removed some unneeded checks for priv being NULL
- Added various convenience functions instead of relying on bools ex:
exar_mpio_set_low()/exar_mpio_set_high() instead of exar_mpio_set()
- Renamed some variables and defines for clarity
- Numerous minor formatting fixes

Changes in v4:
- Removed pcidev and dev from struct exar8250
- Removed some debug prints
- Removed some unneeded checks if PCI vendor was Exar
- Changed several functions to take pcidev as arg to avoid adding to priv
- Removed _exar_mpio_config(), only needed exar_mpio_config_output()
- Removed _cti_set_tristate() and _cti_set_plx_int_enable, same as above

drivers/tty/serial/8250/8250_exar.c | 846 ++++++++++++++++++++++++++++
1 file changed, 846 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 197f45e306ff..6985aabe13cc 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -20,6 +20,7 @@
#include <linux/property.h>
#include <linux/string.h>
#include <linux/types.h>
+#include <linux/bitfield.h>

#include <linux/serial_8250.h>
#include <linux/serial_core.h>
@@ -128,6 +129,19 @@
#define UART_EXAR_DLD 0x02 /* Divisor Fractional */
#define UART_EXAR_DLD_485_POLARITY 0x80 /* RS-485 Enable Signal Polarity */

+/* EEPROM registers */
+#define UART_EXAR_REGB 0x8e
+#define UART_EXAR_REGB_EECK BIT(4)
+#define UART_EXAR_REGB_EECS BIT(5)
+#define UART_EXAR_REGB_EEDI BIT(6)
+#define UART_EXAR_REGB_EEDO BIT(7)
+#define UART_EXAR_REGB_EE_ADDR_SIZE 6
+#define UART_EXAR_REGB_EE_DATA_SIZE 16
+
+#define UART_EXAR_XR17C15X_PORT_OFFSET 0x200
+#define UART_EXAR_XR17V25X_PORT_OFFSET 0x200
+#define UART_EXAR_XR17V35X_PORT_OFFSET 0x400
+
/*
* IOT2040 MPIO wiring semantics:
*
@@ -163,6 +177,52 @@
#define IOT2040_UARTS_ENABLE 0x03
#define IOT2040_UARTS_GPIO_HI_MODE 0xF8 /* enable & LED as outputs */

+/* CTI EEPROM offsets */
+#define CTI_EE_OFF_XR17C15X_OSC_FREQ 0x04 /* 2 words */
+#define CTI_EE_OFF_XR17V25X_OSC_FREQ 0x08 /* 2 words */
+#define CTI_EE_OFF_XR17C15X_PART_NUM 0x0A /* 4 words */
+#define CTI_EE_OFF_XR17V25X_PART_NUM 0x0E /* 4 words */
+#define CTI_EE_OFF_XR17C15X_SERIAL_NUM 0x0E /* 1 word */
+#define CTI_EE_OFF_XR17V25X_SERIAL_NUM 0x12 /* 1 word */
+#define CTI_EE_OFF_XR17V35X_SERIAL_NUM 0x11 /* 2 word */
+#define CTI_EE_OFF_XR17V35X_BRD_FLAGS 0x13 /* 1 word */
+#define CTI_EE_OFF_XR17V35X_PORT_FLAGS 0x14 /* 1 word */
+
+#define CTI_EE_MASK_PORT_FLAGS_TYPE GENMASK(7, 0)
+#define CTI_EE_MASK_OSC_FREQ_LOWER GENMASK(15, 0)
+#define CTI_EE_MASK_OSC_FREQ_UPPER GENMASK(31, 16)
+
+#define CTI_FPGA_RS485_IO_REG 0x2008
+#define CTI_FPGA_CFG_INT_EN_REG 0x48
+#define CTI_FPGA_CFG_INT_EN_EXT_BIT BIT(15) /* External int enable bit */
+
+#define CTI_DEFAULT_PCI_OSC_FREQ 29491200
+#define CTI_DEFAULT_PCIE_OSC_FREQ 125000000
+#define CTI_DEFAULT_FPGA_OSC_FREQ 33333333
+
+/*
+ * CTI Serial port line types. These match the values stored in the first
+ * nibble of the CTI EEPROM port_flags word.
+ */
+enum cti_port_type {
+ CTI_PORT_TYPE_NONE = 0,
+ CTI_PORT_TYPE_RS232, // RS232 ONLY
+ CTI_PORT_TYPE_RS422_485, // RS422/RS485 ONLY
+ CTI_PORT_TYPE_RS232_422_485_HW, // RS232/422/485 HW ONLY Switchable
+ CTI_PORT_TYPE_RS232_422_485_SW, // RS232/422/485 SW ONLY Switchable
+ CTI_PORT_TYPE_RS232_422_485_4B, // RS232/422/485 HW/SW (4bit ex. BCG004)
+ CTI_PORT_TYPE_RS232_422_485_2B, // RS232/422/485 HW/SW (2bit ex. BBG008)
+ CTI_PORT_TYPE_MAX,
+};
+
+#define CTI_PORT_TYPE_VALID(_port_type) \
+ (((_port_type) > CTI_PORT_TYPE_NONE) && \
+ ((_port_type) < CTI_PORT_TYPE_MAX))
+
+#define CTI_PORT_TYPE_RS485(_port_type) \
+ (((_port_type) > CTI_PORT_TYPE_RS232) && \
+ ((_port_type) < CTI_PORT_TYPE_MAX))
+
struct exar8250;

struct exar8250_platform {
@@ -192,11 +252,201 @@ struct exar8250_board {

struct exar8250 {
unsigned int nr;
+ unsigned int osc_freq;
struct exar8250_board *board;
void __iomem *virt;
int line[];
};

+static inline void exar_write_reg(struct exar8250 *priv,
+ unsigned int reg, u8 value)
+{
+ writeb(value, priv->virt + reg);
+}
+
+static inline u8 exar_read_reg(struct exar8250 *priv, unsigned int reg)
+{
+ return readb(priv->virt + reg);
+}
+
+static inline void exar_ee_select(struct exar8250 *priv)
+{
+ // Set chip select pin high to enable EEPROM reads/writes
+ exar_write_reg(priv, UART_EXAR_REGB, UART_EXAR_REGB_EECS);
+ // Min ~500ns delay needed between CS assert and EEPROM access
+ udelay(1);
+}
+
+static inline void exar_ee_deselect(struct exar8250 *priv)
+{
+ exar_write_reg(priv, UART_EXAR_REGB, 0x00);
+}
+
+static inline void exar_ee_write_bit(struct exar8250 *priv, int bit)
+{
+ u8 value = UART_EXAR_REGB_EECS;
+
+ if (bit)
+ value |= UART_EXAR_REGB_EEDI;
+
+ // Clock out the bit on the EEPROM interface
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ // 2us delay = ~500khz clock speed
+ udelay(2);
+
+ value |= UART_EXAR_REGB_EECK;
+
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ udelay(2);
+}
+
+static inline u8 exar_ee_read_bit(struct exar8250 *priv)
+{
+ u8 regb;
+ u8 value = UART_EXAR_REGB_EECS;
+
+ // Clock in the bit on the EEPROM interface
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ // 2us delay = ~500khz clock speed
+ udelay(2);
+
+ value |= UART_EXAR_REGB_EECK;
+
+ exar_write_reg(priv, UART_EXAR_REGB, value);
+ udelay(2);
+
+ regb = exar_read_reg(priv, UART_EXAR_REGB);
+
+ return (regb & UART_EXAR_REGB_EEDO ? 1 : 0);
+}
+
+/**
+ * exar_ee_read() - Read a word from the EEPROM
+ * @priv: Device's private structure
+ * @ee_addr: Offset of EEPROM to read word from
+ *
+ * Read a single 16bit word from an Exar UART's EEPROM.
+ *
+ * Return: EEPROM word
+ */
+static u16 exar_ee_read(struct exar8250 *priv, u8 ee_addr)
+{
+ int i;
+ u16 data = 0;
+
+ exar_ee_select(priv);
+
+ // Send read command (opcode 110)
+ exar_ee_write_bit(priv, 1);
+ exar_ee_write_bit(priv, 1);
+ exar_ee_write_bit(priv, 0);
+
+ // Send address to read from
+ for (i = 1 << (UART_EXAR_REGB_EE_ADDR_SIZE - 1); i; i >>= 1)
+ exar_ee_write_bit(priv, (ee_addr & i));
+
+ // Read data 1 bit at a time
+ for (i = 0; i <= UART_EXAR_REGB_EE_DATA_SIZE; i++) {
+ data <<= 1;
+ data |= exar_ee_read_bit(priv);
+ }
+
+ exar_ee_deselect(priv);
+
+ return data;
+}
+
+/**
+ * exar_mpio_config_output() - Configure an Exar MPIO as an output
+ * @priv: Device's private structure
+ * @mpio_num: MPIO number/offset to configure
+ *
+ * Configure a single MPIO as an output and disable tristate. It is reccomended
+ * to set the level with exar_mpio_set_high()/exar_mpio_set_low() prior to
+ * calling this function to ensure default MPIO pin state.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int exar_mpio_config_output(struct exar8250 *priv,
+ unsigned int mpio_num)
+{
+ unsigned int mpio_offset;
+ u8 sel_reg; // MPIO Select register (input/output)
+ u8 tri_reg; // MPIO Tristate register
+ u8 value;
+
+ if (mpio_num < 8) {
+ sel_reg = UART_EXAR_MPIOSEL_7_0;
+ tri_reg = UART_EXAR_MPIO3T_7_0;
+ mpio_offset = mpio_num;
+ } else if (mpio_num >= 8 && mpio_num < 16) {
+ sel_reg = UART_EXAR_MPIOSEL_15_8;
+ tri_reg = UART_EXAR_MPIO3T_15_8;
+ mpio_offset = mpio_num - 8;
+ } else {
+ return -EINVAL;
+ }
+
+ // Disable MPIO pin tri-state
+ value = exar_read_reg(priv, tri_reg);
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, tri_reg, value);
+
+ value = exar_read_reg(priv, sel_reg);
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, sel_reg, value);
+
+ return 0;
+}
+
+/**
+ * _exar_mpio_set() - Set an Exar MPIO output high or low
+ * @priv: Device's private structure
+ * @mpio_num: MPIO number/offset to set
+ * @high: Set MPIO high if true, low if false
+ *
+ * Set a single MPIO high or low. exar_mpio_config_output() must also be called
+ * to configure the pin as an output.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int _exar_mpio_set(struct exar8250 *priv,
+ unsigned int mpio_num, bool high)
+{
+ unsigned int mpio_offset;
+ u8 lvl_reg;
+ u8 value;
+
+ if (mpio_num < 8) {
+ lvl_reg = UART_EXAR_MPIOLVL_7_0;
+ mpio_offset = mpio_num;
+ } else if (mpio_num >= 8 && mpio_num < 16) {
+ lvl_reg = UART_EXAR_MPIOLVL_15_8;
+ mpio_offset = mpio_num - 8;
+ } else {
+ return -EINVAL;
+ }
+
+ value = exar_read_reg(priv, lvl_reg);
+ if (high)
+ value |= BIT(mpio_offset);
+ else
+ value &= ~BIT(mpio_offset);
+ exar_write_reg(priv, lvl_reg, value);
+
+ return 0;
+}
+
+static int exar_mpio_set_low(struct exar8250 *priv, unsigned int mpio_num)
+{
+ return _exar_mpio_set(priv, mpio_num, false);
+}
+
+static int exar_mpio_set_high(struct exar8250 *priv, unsigned int mpio_num)
+{
+ return _exar_mpio_set(priv, mpio_num, true);
+}
+
static int generic_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
@@ -385,6 +635,546 @@ pci_fastcom335_setup(struct exar8250 *priv, struct pci_dev *pcidev,
return 0;
}

+/**
+ * cti_tristate_disable() - Disable RS485 transciever tristate
+ * @priv: Device's private structure
+ * @port_num: Port number to set tristate off
+ *
+ * Most RS485 capable cards have a power on tristate jumper/switch that ensures
+ * the RS422/RS485 transciever does not drive a multi-drop RS485 bus when it is
+ * not the master. When this jumper is installed the user must set the RS485
+ * mode to Full or Half duplex to disable tristate prior to using the port.
+ *
+ * Some Exar UARTs have an auto-tristate feature while others require setting
+ * an MPIO to disable the tristate.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int cti_tristate_disable(struct exar8250 *priv, unsigned int port_num)
+{
+ int ret;
+
+ ret = exar_mpio_set_high(priv, port_num);
+ if (ret)
+ return ret;
+
+ return exar_mpio_config_output(priv, port_num);
+}
+
+/**
+ * cti_plx_int_enable() - Enable UART interrupts to PLX bridge
+ * @priv: Device's private structure
+ *
+ * Some older CTI cards require MPIO_0 to be set low to enable the
+ * interupts from the UART to the PLX PCI->PCIe bridge.
+ *
+ * Return: 0 on success, negative error code on failure
+ */
+static int cti_plx_int_enable(struct exar8250 *priv)
+{
+ int ret;
+
+ ret = exar_mpio_set_low(priv, 0);
+ if (ret)
+ return ret;
+
+ return exar_mpio_config_output(priv, 0);
+}
+
+/**
+ * cti_read_osc_freq() - Read the UART oscillator frequency from EEPROM
+ * @priv: Device's private structure
+ * @eeprom_offset: Offset where the oscillator frequency is stored
+ *
+ * CTI XR17x15X and XR17V25X cards have the serial boards oscillator frequency
+ * stored in the EEPROM. FPGA and XR17V35X based cards use the PCI/PCIe clock.
+ *
+ * Return: frequency on success, negative error code on failure
+ */
+static int cti_read_osc_freq(struct exar8250 *priv, u8 eeprom_offset)
+{
+ u16 lower_word;
+ u16 upper_word;
+ int osc_freq;
+
+ lower_word = exar_ee_read(priv, eeprom_offset);
+ // Check if EEPROM word was blank
+ if (lower_word == 0xFFFF)
+ return -EIO;
+
+ upper_word = exar_ee_read(priv, (eeprom_offset + 1));
+ if (upper_word == 0xFFFF)
+ return -EIO;
+
+ osc_freq = FIELD_PREP(CTI_EE_MASK_OSC_FREQ_LOWER, lower_word) |
+ FIELD_PREP(CTI_EE_MASK_OSC_FREQ_UPPER, upper_word);
+
+ return osc_freq;
+}
+
+/**
+ * cti_get_port_type_xr17c15x_xr17v25x() - Get port type of xr17c15x/xr17v25x
+ * @priv: Device's private structure
+ * @port_num: Port to get type of
+ *
+ * CTI xr17c15x and xr17v25x based cards port types are based on PCI IDs.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_xr17c15x_xr17v25x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ enum cti_port_type port_type;
+
+ switch (pcidev->subsystem_device) {
+ // RS232 only cards
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS:
+ port_type = CTI_PORT_TYPE_RS232;
+ break;
+ // 1x RS232, 1x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1:
+ port_type = (port_num == 0) ?
+ CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ break;
+ // 2x RS232, 2x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2:
+ port_type = (port_num < 2) ?
+ CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ break;
+ // 4x RS232, 4x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ port_type = (port_num < 4) ?
+ CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ break;
+ // RS232/RS422/RS485 HW (jumper) selectable
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ port_type = CTI_PORT_TYPE_RS232_422_485_HW;
+ break;
+ // RS422/RS485 HW (jumper) selectable
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ port_type = CTI_PORT_TYPE_RS422_485;
+ break;
+ // 6x RS232, 2x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ port_type = (port_num < 6) ?
+ CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ break;
+ // 2x RS232, 6x RS422/RS485
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ port_type = (port_num < 2) ?
+ CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
+ break;
+ default:
+ dev_err(&pcidev->dev, "unknown/unsupported device\n");
+ port_type = CTI_PORT_TYPE_NONE;
+ }
+
+ return port_type;
+}
+
+/**
+ * cti_get_port_type_fpga() - Get the port type of a CTI FPGA card
+ * @priv: Device's private structure
+ * @port_num: Port to get type of
+ *
+ * FPGA based cards port types are based on PCI IDs.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_fpga(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ enum cti_port_type port_type;
+
+ switch (pcidev->device) {
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X:
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X:
+ case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16:
+ port_type = CTI_PORT_TYPE_RS232_422_485_HW;
+ break;
+ default:
+ dev_err(&pcidev->dev, "unknown/unsupported device\n");
+ return CTI_PORT_TYPE_NONE;
+ }
+
+ return port_type;
+}
+
+/**
+ * cti_get_port_type_xr17v35x() - Read port type from the EEPROM
+ * @priv: Device's private structure
+ * @port_num: port offset
+ *
+ * CTI XR17V35X based cards have the port types stored in the EEPROM.
+ * This function reads the port type for a single port.
+ *
+ * Return: port type on success, CTI_PORT_TYPE_NONE on failure
+ */
+static enum cti_port_type cti_get_port_type_xr17v35x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ unsigned int port_num)
+{
+ enum cti_port_type port_type;
+ u16 port_flags;
+ u8 offset;
+
+ offset = CTI_EE_OFF_XR17V35X_PORT_FLAGS + port_num;
+ port_flags = exar_ee_read(priv, offset);
+
+ port_type = FIELD_GET(CTI_EE_MASK_PORT_FLAGS_TYPE, port_flags);
+ if (!CTI_PORT_TYPE_VALID(port_type)) {
+ /*
+ * If the port type is missing the card assume it is a
+ * RS232/RS422/RS485 card to be safe.
+ *
+ * There is one known board (BEG013) that only has
+ * 3 of 4 port types written to the EEPROM so this
+ * acts as a work around.
+ */
+ dev_warn(&pcidev->dev,
+ "failed to get port %d type from EEPROM\n", port_num);
+ port_type = CTI_PORT_TYPE_RS232_422_485_HW;
+ }
+
+ return port_type;
+}
+
+static int cti_rs485_config_mpio_tristate(struct uart_port *port,
+ struct ktermios *termios,
+ struct serial_rs485 *rs485)
+{
+ struct exar8250 *priv = (struct exar8250 *)port->private_data;
+ int ret;
+
+ ret = generic_rs485_config(port, termios, rs485);
+ if (ret)
+ return ret;
+
+ // Disable power-on RS485 tri-state via MPIO
+ return cti_tristate_disable(priv, port->port_id);
+}
+
+static int cti_port_setup_common(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ int idx, unsigned int offset,
+ struct uart_8250_port *port)
+{
+ int ret;
+
+ if (priv->osc_freq == 0)
+ return -EINVAL;
+
+ port->port.port_id = idx;
+ port->port.uartclk = priv->osc_freq;
+
+ ret = serial8250_pci_setup_port(pcidev, port, 0, offset, 0);
+ if (ret) {
+ dev_err(&pcidev->dev,
+ "failed to setup pci for port %d err: %d\n", idx, ret);
+ return ret;
+ }
+
+ port->port.private_data = (void *)priv;
+ port->port.pm = exar_pm;
+ port->port.shutdown = exar_shutdown;
+
+ return 0;
+}
+
+static int cti_port_setup_fpga(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+
+ port_type = cti_get_port_type_fpga(priv, pcidev, idx);
+
+ // FPGA shares port offests with XR17C15X
+ offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ port->port.rs485_config = generic_rs485_config;
+ port->port.rs485_supported = generic_rs485_supported;
+ }
+
+ return cti_port_setup_common(priv, pcidev, idx, offset, port);
+}
+
+static int cti_port_setup_xr17v35x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+ int ret;
+
+ port_type = cti_get_port_type_xr17v35x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17V35X_PORT_OFFSET;
+ port->port.type = PORT_XR17V35X;
+
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ switch (port_type) {
+ case CTI_PORT_TYPE_RS422_485:
+ case CTI_PORT_TYPE_RS232_422_485_HW:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
+ port->port.rs485_supported = generic_rs485_supported;
+ break;
+ case CTI_PORT_TYPE_RS232_422_485_SW:
+ case CTI_PORT_TYPE_RS232_422_485_4B:
+ case CTI_PORT_TYPE_RS232_422_485_2B:
+ port->port.rs485_config = generic_rs485_config;
+ port->port.rs485_supported = generic_rs485_supported;
+ break;
+ default:
+ break;
+ }
+
+ ret = cti_port_setup_common(priv, pcidev, idx, offset, port);
+ if (ret)
+ return ret;
+
+ exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00);
+ exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD);
+ exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 128);
+ exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 128);
+
+ return 0;
+}
+
+static int cti_port_setup_xr17v25x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+ int ret;
+
+ port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17V25X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ // XR17V25X supports fractional baudrates
+ port->port.get_divisor = xr17v35x_get_divisor;
+ port->port.set_divisor = xr17v35x_set_divisor;
+ port->port.startup = xr17v35x_startup;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ switch (pcidev->subsystem_device) {
+ // These cards support power on 485 tri-state via MPIO
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
+ break;
+ // Otherwise auto or no power on 485 tri-state support
+ default:
+ port->port.rs485_config = generic_rs485_config;
+ break;
+ }
+
+ port->port.rs485_supported = generic_rs485_supported;
+ }
+
+ ret = cti_port_setup_common(priv, pcidev, idx, offset, port);
+ if (ret)
+ return ret;
+
+ exar_write_reg(priv, (offset + UART_EXAR_8XMODE), 0x00);
+ exar_write_reg(priv, (offset + UART_EXAR_FCTR), UART_FCTR_EXAR_TRGD);
+ exar_write_reg(priv, (offset + UART_EXAR_TXTRG), 32);
+ exar_write_reg(priv, (offset + UART_EXAR_RXTRG), 32);
+
+ return 0;
+}
+
+static int cti_port_setup_xr17c15x(struct exar8250 *priv,
+ struct pci_dev *pcidev,
+ struct uart_8250_port *port,
+ int idx)
+{
+ enum cti_port_type port_type;
+ unsigned int offset;
+
+ port_type = cti_get_port_type_xr17c15x_xr17v25x(priv, pcidev, idx);
+
+ offset = idx * UART_EXAR_XR17C15X_PORT_OFFSET;
+ port->port.type = PORT_XR17D15X;
+
+ if (CTI_PORT_TYPE_RS485(port_type)) {
+ switch (pcidev->subsystem_device) {
+ // These cards support power on 485 tri-state via MPIO
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
+ port->port.rs485_config = cti_rs485_config_mpio_tristate;
+ break;
+ // Otherwise auto or no power on 485 tri-state support
+ default:
+ port->port.rs485_config = generic_rs485_config;
+ break;
+ }
+
+ port->port.rs485_supported = generic_rs485_supported;
+ }
+
+ return cti_port_setup_common(priv, pcidev, idx, offset, port);
+}
+
+static int cti_board_init_xr17v35x(struct exar8250 *priv,
+ struct pci_dev *pcidev)
+{
+ // XR17V35X uses the PCIe clock rather than an oscillator
+ priv->osc_freq = CTI_DEFAULT_PCIE_OSC_FREQ;
+
+ return 0;
+}
+
+static int cti_board_init_xr17v25x(struct exar8250 *priv,
+ struct pci_dev *pcidev)
+{
+ int osc_freq;
+
+ osc_freq = cti_read_osc_freq(priv, CTI_EE_OFF_XR17V25X_OSC_FREQ);
+ if (osc_freq < 0) {
+ dev_warn(&pcidev->dev,
+ "failed to read osc freq from EEPROM, using default\n");
+ osc_freq = CTI_DEFAULT_PCI_OSC_FREQ;
+ }
+
+ priv->osc_freq = osc_freq;
+
+ /* enable interupts on cards that need the "PLX fix" */
+ switch (pcidev->subsystem_device) {
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B:
+ cti_plx_int_enable(priv);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int cti_board_init_xr17c15x(struct exar8250 *priv,
+ struct pci_dev *pcidev)
+{
+ int osc_freq;
+
+ osc_freq = cti_read_osc_freq(priv, CTI_EE_OFF_XR17C15X_OSC_FREQ);
+ if (osc_freq <= 0) {
+ dev_warn(&pcidev->dev,
+ "failed to read osc freq from EEPROM, using default\n");
+ osc_freq = CTI_DEFAULT_PCI_OSC_FREQ;
+ }
+
+ priv->osc_freq = osc_freq;
+
+ /* enable interrupts on cards that need the "PLX fix" */
+ switch (pcidev->subsystem_device) {
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A:
+ case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B:
+ cti_plx_int_enable(priv);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int cti_board_init_fpga(struct exar8250 *priv, struct pci_dev *pcidev)
+{
+ int ret;
+ u16 cfg_val;
+
+ // FPGA OSC is fixed to the 33MHz PCI clock
+ priv->osc_freq = CTI_DEFAULT_FPGA_OSC_FREQ;
+
+ // Enable external interrupts in special cfg space register
+ ret = pci_read_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, &cfg_val);
+ if (ret)
+ return ret;
+
+ cfg_val |= CTI_FPGA_CFG_INT_EN_EXT_BIT;
+ ret = pci_write_config_word(pcidev, CTI_FPGA_CFG_INT_EN_REG, cfg_val);
+ if (ret)
+ return ret;
+
+ // RS485 gate needs to be enabled; otherwise RTS/CTS will not work
+ exar_write_reg(priv, CTI_FPGA_RS485_IO_REG, 0x01);
+
+ return 0;
+}
+
static int
pci_xr17c154_setup(struct exar8250 *priv, struct pci_dev *pcidev,
struct uart_8250_port *port, int idx)
@@ -880,6 +1670,26 @@ static const struct exar8250_board pbn_fastcom335_8 = {
.setup = pci_fastcom335_setup,
};

+static const struct exar8250_board pbn_cti_xr17c15x = {
+ .board_init = cti_board_init_xr17c15x,
+ .setup = cti_port_setup_xr17c15x,
+};
+
+static const struct exar8250_board pbn_cti_xr17v25x = {
+ .board_init = cti_board_init_xr17v25x,
+ .setup = cti_port_setup_xr17v25x,
+};
+
+static const struct exar8250_board pbn_cti_xr17v35x = {
+ .board_init = cti_board_init_xr17v35x,
+ .setup = cti_port_setup_xr17v35x,
+};
+
+static const struct exar8250_board pbn_cti_fpga = {
+ .board_init = cti_board_init_fpga,
+ .setup = cti_port_setup_fpga,
+};
+
static const struct exar8250_board pbn_exar_ibm_saturn = {
.num_ports = 1,
.setup = pci_xr17c154_setup,
@@ -924,6 +1734,26 @@ static const struct exar8250_board pbn_exar_XR17V8358 = {
.exit = pci_xr17v35x_exit,
};

+// For Connect Tech cards with Exar vendor/device PCI IDs
+#define CTI_EXAR_DEVICE(devid, bd) { \
+ PCI_DEVICE_SUB( \
+ PCI_VENDOR_ID_EXAR, \
+ PCI_DEVICE_ID_EXAR_##devid, \
+ PCI_SUBVENDOR_ID_CONNECT_TECH, \
+ PCI_ANY_ID), 0, 0, \
+ (kernel_ulong_t)&bd \
+ }
+
+// For Connect Tech cards with Connect Tech vendor/device PCI IDs (FPGA based)
+#define CTI_PCI_DEVICE(devid, bd) { \
+ PCI_DEVICE_SUB( \
+ PCI_VENDOR_ID_CONNECT_TECH, \
+ PCI_DEVICE_ID_CONNECT_TECH_PCI_##devid, \
+ PCI_ANY_ID, \
+ PCI_ANY_ID), 0, 0, \
+ (kernel_ulong_t)&bd \
+ }
+
#define EXAR_DEVICE(vend, devid, bd) { PCI_DEVICE_DATA(vend, devid, &bd) }

#define IBM_DEVICE(devid, sdevid, bd) { \
@@ -953,6 +1783,22 @@ static const struct pci_device_id exar_pci_tbl[] = {
EXAR_DEVICE(ACCESSIO, COM_4SM, pbn_exar_XR17C15x),
EXAR_DEVICE(ACCESSIO, COM_8SM, pbn_exar_XR17C15x),

+ CTI_EXAR_DEVICE(XR17C152, pbn_cti_xr17c15x),
+ CTI_EXAR_DEVICE(XR17C154, pbn_cti_xr17c15x),
+ CTI_EXAR_DEVICE(XR17C158, pbn_cti_xr17c15x),
+
+ CTI_EXAR_DEVICE(XR17V252, pbn_cti_xr17v25x),
+ CTI_EXAR_DEVICE(XR17V254, pbn_cti_xr17v25x),
+ CTI_EXAR_DEVICE(XR17V258, pbn_cti_xr17v25x),
+
+ CTI_EXAR_DEVICE(XR17V352, pbn_cti_xr17v35x),
+ CTI_EXAR_DEVICE(XR17V354, pbn_cti_xr17v35x),
+ CTI_EXAR_DEVICE(XR17V358, pbn_cti_xr17v35x),
+
+ CTI_PCI_DEVICE(XR79X_12_XIG00X, pbn_cti_fpga),
+ CTI_PCI_DEVICE(XR79X_12_XIG01X, pbn_cti_fpga),
+ CTI_PCI_DEVICE(XR79X_16, pbn_cti_fpga),
+
IBM_DEVICE(XR17C152, SATURN_SERIAL_ONE_PORT, pbn_exar_ibm_saturn),

/* USRobotics USR298x-OEM PCI Modems */
--
2.43.2