From: Parker Newman <pnewman@xxxxxxxxxxxxxxx> Replace the custom 93cx6 EEPROM read functions with the eeprom_93cx6 driver. This removes duplicate code and improves code readability. exar_ee_read() calls are replaced with eeprom_93cx6_read() or eeprom_93cx6_multiread(). Link to discussion with Andy Shevchenko: Link: https://lore.kernel.org/linux-serial/Ztr5u2wEt8VF1IdI@xxxxxxxxxxxxxxxxxx/ Note: Old exar_ee_read() and associated functions are removed in next patch in this series. Signed-off-by: Parker Newman <pnewman@xxxxxxxxxxxxxxx> --- drivers/tty/serial/8250/8250_exar.c | 54 +++++++++++++++++++++++------ 1 file changed, 43 insertions(+), 11 deletions(-) diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index b7a75db15249..0edb5aeba199 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -21,6 +21,7 @@ #include <linux/property.h> #include <linux/string.h> #include <linux/types.h> +#include <linux/eeprom_93cx6.h> #include <linux/serial_8250.h> #include <linux/serial_core.h> @@ -252,6 +253,7 @@ struct exar8250 { unsigned int nr; unsigned int osc_freq; struct exar8250_board *board; + struct eeprom_93cx6 eeprom; void __iomem *virt; int line[]; }; @@ -355,6 +357,39 @@ static u16 exar_ee_read(struct exar8250 *priv, u8 ee_addr) return data; } +static void exar_eeprom_93cx6_reg_read(struct eeprom_93cx6 *eeprom) +{ + struct exar8250 *priv = (struct exar8250 *)eeprom->data; + u8 regb = exar_read_reg(priv, UART_EXAR_REGB); + + // EECK and EECS always read 0 from REGB so only set EEDO + eeprom->reg_data_out = regb & UART_EXAR_REGB_EEDO; +} + +static void exar_eeprom_93cx6_reg_write(struct eeprom_93cx6 *eeprom) +{ + struct exar8250 *priv = (struct exar8250 *)eeprom->data; + u8 regb = 0; + + if (eeprom->reg_data_in) + regb |= UART_EXAR_REGB_EEDI; + if (eeprom->reg_data_clock) + regb |= UART_EXAR_REGB_EECK; + if (eeprom->reg_chip_select) + regb |= UART_EXAR_REGB_EECS; + + exar_write_reg(priv, UART_EXAR_REGB, regb); +} + +static void exar_eeprom_init(struct exar8250 *priv) +{ + priv->eeprom.data = (void *)priv; + priv->eeprom.register_read = exar_eeprom_93cx6_reg_read; + priv->eeprom.register_write = exar_eeprom_93cx6_reg_write; + priv->eeprom.width = PCI_EEPROM_WIDTH_93C46; + priv->eeprom.quirks |= PCI_EEPROM_QUIRK_EXTRA_READ_CYCLE; +} + /** * exar_mpio_config_output() - Configure an Exar MPIO as an output * @priv: Device's private structure @@ -696,20 +731,15 @@ static int cti_plx_int_enable(struct exar8250 *priv) */ static int cti_read_osc_freq(struct exar8250 *priv, u8 eeprom_offset) { - u16 lower_word; - u16 upper_word; + __le32 osc_freq_le; - lower_word = exar_ee_read(priv, eeprom_offset); - // Check if EEPROM word was blank - if (lower_word == 0xFFFF) - return -EIO; + eeprom_93cx6_multiread(&priv->eeprom, eeprom_offset, + (__le16 *)&osc_freq_le, 2); - upper_word = exar_ee_read(priv, (eeprom_offset + 1)); - if (upper_word == 0xFFFF) + if (osc_freq_le == 0xFFFFFFFF) return -EIO; - return FIELD_PREP(CTI_EE_MASK_OSC_FREQ_LOWER, lower_word) | - FIELD_PREP(CTI_EE_MASK_OSC_FREQ_UPPER, upper_word); + return le32_to_cpu(osc_freq_le); } /** @@ -833,7 +863,7 @@ static enum cti_port_type cti_get_port_type_xr17v35x(struct exar8250 *priv, u8 offset; offset = CTI_EE_OFF_XR17V35X_PORT_FLAGS + port_num; - port_flags = exar_ee_read(priv, offset); + eeprom_93cx6_read(&priv->eeprom, offset, &port_flags); port_type = FIELD_GET(CTI_EE_MASK_PORT_FLAGS_TYPE, port_flags); if (CTI_PORT_TYPE_VALID(port_type)) @@ -1551,6 +1581,8 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent) if (rc) return rc; + exar_eeprom_init(priv); + for (i = 0; i < nr_ports && i < maxnr; i++) { rc = board->setup(priv, pcidev, &uart, i); if (rc) { -- 2.46.0
