diff options
Diffstat (limited to 'drivers/media/pci/solo6x10/solo6x10-eeprom.c')
| -rw-r--r-- | drivers/media/pci/solo6x10/solo6x10-eeprom.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/media/pci/solo6x10/solo6x10-eeprom.c b/drivers/media/pci/solo6x10/solo6x10-eeprom.c new file mode 100644 index 000000000..0d864b8ca --- /dev/null +++ b/drivers/media/pci/solo6x10/solo6x10-eeprom.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com> + * + * Original author: + * Ben Collins <bcollins@ubuntu.com> + * + * Additional work by: + * John Brooks <john.brooks@bluecherry.net> + */ + +#include <linux/kernel.h> +#include <linux/delay.h> + +#include "solo6x10.h" + +/* Control */ +#define EE_SHIFT_CLK 0x04 +#define EE_CS 0x08 +#define EE_DATA_WRITE 0x02 +#define EE_DATA_READ 0x01 +#define EE_ENB (0x80 | EE_CS) + +#define eeprom_delay() udelay(100) +#if 0 +#define eeprom_delay() solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) +#define eeprom_delay() ({ \ + int i, ret; \ + udelay(100); \ + for (i = ret = 0; i < 1000 && !ret; i++) \ + ret = solo_eeprom_reg_read(solo_dev); \ +}) +#endif +#define ADDR_LEN 6 + +/* Commands */ +#define EE_EWEN_CMD 4 +#define EE_EWDS_CMD 4 +#define EE_WRITE_CMD 5 +#define EE_READ_CMD 6 +#define EE_ERASE_CMD 7 + +static unsigned int solo_eeprom_reg_read(struct solo_dev *solo_dev) +{ + return solo_reg_read(solo_dev, SOLO_EEPROM_CTRL) & EE_DATA_READ; +} + +static void solo_eeprom_reg_write(struct solo_dev *solo_dev, u32 data) +{ + solo_reg_write(solo_dev, SOLO_EEPROM_CTRL, data); + eeprom_delay(); +} + +static void solo_eeprom_cmd(struct solo_dev *solo_dev, int cmd) +{ + int i; + + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ACCESS_EN); + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); + + for (i = 4 + ADDR_LEN; i >= 0; i--) { + int dataval = (cmd & (1 << i)) ? EE_DATA_WRITE : 0; + + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | dataval); + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | + EE_SHIFT_CLK | dataval); + } + + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); +} + +unsigned int solo_eeprom_ewen(struct solo_dev *solo_dev, int w_en) +{ + int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN); + unsigned int retval = 0; + int i; + + solo_eeprom_cmd(solo_dev, ewen_cmd); + + for (i = 0; i < 16; i++) { + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | + EE_SHIFT_CLK); + retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); + retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); + } + + solo_eeprom_reg_write(solo_dev, ~EE_CS); + retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); + + return retval; +} + +__be16 solo_eeprom_read(struct solo_dev *solo_dev, int loc) +{ + int read_cmd = loc | (EE_READ_CMD << ADDR_LEN); + u16 retval = 0; + int i; + + solo_eeprom_cmd(solo_dev, read_cmd); + + for (i = 0; i < 16; i++) { + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE | + EE_SHIFT_CLK); + retval = (retval << 1) | solo_eeprom_reg_read(solo_dev); + solo_eeprom_reg_write(solo_dev, SOLO_EEPROM_ENABLE); + } + + solo_eeprom_reg_write(solo_dev, ~EE_CS); + + return (__force __be16)retval; +} + +int solo_eeprom_write(struct solo_dev *solo_dev, int loc, + __be16 data) +{ + int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN); + unsigned int retval; + int i; + + solo_eeprom_cmd(solo_dev, write_cmd); + + for (i = 15; i >= 0; i--) { + unsigned int dataval = ((__force unsigned)data >> i) & 1; + + solo_eeprom_reg_write(solo_dev, EE_ENB); + solo_eeprom_reg_write(solo_dev, + EE_ENB | (dataval << 1) | EE_SHIFT_CLK); + } + + solo_eeprom_reg_write(solo_dev, EE_ENB); + solo_eeprom_reg_write(solo_dev, ~EE_CS); + solo_eeprom_reg_write(solo_dev, EE_ENB); + + for (i = retval = 0; i < 10000 && !retval; i++) + retval = solo_eeprom_reg_read(solo_dev); + + solo_eeprom_reg_write(solo_dev, ~EE_CS); + + return !retval; +} |