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Subject[PATCH v4 2/2] Staging: octeon-usb: Changes macro CVMX_WAIT_FOR_FIELD32 to function call.
Date
Replacing CVMX_WAIT_FOR_FIELD32 macro with equivalent function.

Signed-off-by: Georgios Tsotsos <tsotsos@gmail.com>
---
v2: Changed CVMX_WAIT_FOR_FIELD32 syntax to avoid checkpatch check notice and
tried to make the macro more readable.
v3: Changed CVMX_WAIT_FOR_FIELD32 macro to function according as refereed in
commit message and suggested by Greg Kroah-Hartman
v4: Added patch version text

drivers/staging/octeon-usb/octeon-hcd.c | 65 +++++++++++++++++++--------------
1 file changed, 38 insertions(+), 27 deletions(-)

diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
index 4615133292b5..8a7bdf1a9fe6 100644
--- a/drivers/staging/octeon-usb/octeon-hcd.c
+++ b/drivers/staging/octeon-usb/octeon-hcd.c
@@ -377,29 +377,6 @@ struct octeon_hcd {
struct cvmx_usb_tx_fifo nonperiodic;
};

-/* This macro spins on a register waiting for it to reach a condition. */
-#define CVMX_WAIT_FOR_FIELD32(address, _union, cond, timeout_usec) \
- ({int result; \
- do { \
- u64 done = cvmx_get_cycle() + (u64)timeout_usec * \
- octeon_get_clock_rate() / 1000000; \
- union _union c; \
- \
- while (1) { \
- c.u32 = cvmx_usb_read_csr32(usb, address); \
- \
- if (cond) { \
- result = 0; \
- break; \
- } else if (cvmx_get_cycle() > done) { \
- result = -1; \
- break; \
- } else \
- __delay(100); \
- } \
- } while (0); \
- result; })
-
/*
* This macro logically sets a single field in a CSR. It does the sequence
* read, modify, and write
@@ -593,6 +570,42 @@ static inline int cvmx_usb_get_data_pid(struct cvmx_usb_pipe *pipe)
return 0; /* Data0 */
}

+/**
+ * Loop through register until txfflsh or rxfflsh become zero.
+ *
+ * @usb: USB block
+ * @address: 64bit address to read
+ * @timeout_usec: Timeout
+ * @fflsh_type: Indicates fflsh type, 0 for txfflsh, 1 for rxfflsh
+ *
+ */
+static int cvmx_wait_for_field32(struct octeon_hcd *usb, u64 address,
+ u64 timeout_usec, int fflsh_type)
+{
+ int result;
+ u64 done = cvmx_get_cycle() + timeout_usec *
+ (u64)octeon_get_clock_rate / 1000000;
+
+ union cvmx_usbcx_grstctl c;
+
+ while (1) {
+ c.u32 = cvmx_usb_read_csr32(usb, address);
+ if (fflsh_type == 0 && c.s.txfflsh == 0) {
+ result = 0;
+ break;
+ } else if (fflsh_type == 1 && c.s.rxfflsh == 0) {
+ result = 0;
+ break;
+ } else if (cvmx_get_cycle() > done) {
+ result = -1;
+ break;
+ }
+
+ __delay(100);
+ }
+ return result;
+}
+
static void cvmx_fifo_setup(struct octeon_hcd *usb)
{
union cvmx_usbcx_ghwcfg3 usbcx_ghwcfg3;
@@ -635,11 +648,9 @@ static void cvmx_fifo_setup(struct octeon_hcd *usb)
/* Flush all FIFOs */
USB_SET_FIELD32(address, cvmx_usbcx_grstctl, txfnum, 0x10);
USB_SET_FIELD32(address, cvmx_usbcx_grstctl, txfflsh, 1);
- CVMX_WAIT_FOR_FIELD32(address, cvmx_usbcx_grstctl,
- c.s.txfflsh == 0, 100);
+ cvmx_wait_for_field32(usb, address, 0, 100);
USB_SET_FIELD32(address, cvmx_usbcx_grstctl, rxfflsh, 1);
- CVMX_WAIT_FOR_FIELD32(address, cvmx_usbcx_grstctl,
- c.s.rxfflsh == 0, 100);
+ cvmx_wait_for_field32(usb, address, 1, 100);
}

/**
--
2.16.4
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