diff options
Diffstat (limited to 'drivers/usb/otg/ulpi.c')
| -rw-r--r-- | drivers/usb/otg/ulpi.c | 60 |
1 files changed, 52 insertions, 8 deletions
diff --git a/drivers/usb/otg/ulpi.c b/drivers/usb/otg/ulpi.c index ccc81950822b..059d9ac0ab5b 100644 --- a/drivers/usb/otg/ulpi.c +++ b/drivers/usb/otg/ulpi.c @@ -29,12 +29,23 @@ #include <linux/usb/otg.h> #include <linux/usb/ulpi.h> + +struct ulpi_info { + unsigned int id; + char *name; +}; + #define ULPI_ID(vendor, product) (((vendor) << 16) | (product)) +#define ULPI_INFO(_id, _name) \ + { \ + .id = (_id), \ + .name = (_name), \ + } /* ULPI hardcoded IDs, used for probing */ -static unsigned int ulpi_ids[] = { - ULPI_ID(0x04cc, 0x1504), /* NXP ISP1504 */ - ULPI_ID(0x0424, 0x0006), /* SMSC USB3319 */ +static struct ulpi_info ulpi_ids[] = { + ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"), + ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB3319"), }; static int ulpi_set_otg_flags(struct otg_transceiver *otg) @@ -137,6 +148,32 @@ static int ulpi_set_flags(struct otg_transceiver *otg) return ulpi_set_fc_flags(otg); } +static int ulpi_check_integrity(struct otg_transceiver *otg) +{ + int ret, i; + unsigned int val = 0x55; + + for (i = 0; i < 2; i++) { + ret = otg_io_write(otg, val, ULPI_SCRATCH); + if (ret < 0) + return ret; + + ret = otg_io_read(otg, ULPI_SCRATCH); + if (ret < 0) + return ret; + + if (ret != val) { + pr_err("ULPI integrity check: failed!"); + return -ENODEV; + } + val = val << 1; + } + + pr_info("ULPI integrity check: passed.\n"); + + return 0; +} + static int ulpi_init(struct otg_transceiver *otg) { int i, vid, pid, ret; @@ -153,12 +190,19 @@ static int ulpi_init(struct otg_transceiver *otg) pr_info("ULPI transceiver vendor/product ID 0x%04x/0x%04x\n", vid, pid); - for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) - if (ulpi_ids[i] == ULPI_ID(vid, pid)) - return ulpi_set_flags(otg); + for (i = 0; i < ARRAY_SIZE(ulpi_ids); i++) { + if (ulpi_ids[i].id == ULPI_ID(vid, pid)) { + pr_info("Found %s ULPI transceiver.\n", + ulpi_ids[i].name); + break; + } + } + + ret = ulpi_check_integrity(otg); + if (ret) + return ret; - pr_err("ULPI ID does not match any known transceiver.\n"); - return -ENODEV; + return ulpi_set_flags(otg); } static int ulpi_set_host(struct otg_transceiver *otg, struct usb_bus *host) |
