+static void nv_legacybackoff_reseed(struct net_device *dev)
+{
+ u8 __iomem *base = get_hwbase(dev);
+ u32 reg;
+ u32 low;
+ int tx_status = 0;
+
+ reg = readl(base + NvRegSlotTime) & ~NVREG_SLOTTIME_MASK;
+ get_random_bytes(&low, sizeof(low));
+ reg |= low & NVREG_SLOTTIME_MASK;
+
+ /* Need to stop tx before change takes effect.
+ * Caller has already gained np->lock.
+ */
+ tx_status = readl(base + NvRegTransmitterControl) & NVREG_XMITCTL_START;
+ if (tx_status)
+ nv_stop_tx(dev);
+ nv_stop_rx(dev);
+ writel(reg, base + NvRegSlotTime);
+ if (tx_status)
+ nv_start_tx(dev);
+ nv_start_rx(dev);
+}
+
+/* Gear Backoff Seeds */
+#define BACKOFF_SEEDSET_ROWS 8
+#define BACKOFF_SEEDSET_LFSRS 15
+
+/* Known Good seed sets */
+static const u32 main_seedset[BACKOFF_SEEDSET_ROWS][BACKOFF_SEEDSET_LFSRS] = {
+ {145, 155, 165, 175, 185, 196, 235, 245, 255, 265, 275, 285, 660, 690, 874},
+ {245, 255, 265, 575, 385, 298, 335, 345, 355, 366, 375, 385, 761, 790, 974},
+ {145, 155, 165, 175, 185, 196, 235, 245, 255, 265, 275, 285, 660, 690, 874},
+ {245, 255, 265, 575, 385, 298, 335, 345, 355, 366, 375, 386, 761, 790, 974},
+ {266, 265, 276, 585, 397, 208, 345, 355, 365, 376, 385, 396, 771, 700, 984},
+ {266, 265, 276, 586, 397, 208, 346, 355, 365, 376, 285, 396, 771, 700, 984},
+ {366, 365, 376, 686, 497, 308, 447, 455, 466, 476, 485, 496, 871, 800, 84},
+ {466, 465, 476, 786, 597, 408, 547, 555, 566, 576, 585, 597, 971, 900, 184}};
+
+static const u32 gear_seedset[BACKOFF_SEEDSET_ROWS][BACKOFF_SEEDSET_LFSRS] = {
+ {251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375, 30, 295},
+ {351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
+ {351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 397},
+ {251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375, 30, 295},
+ {251, 262, 273, 324, 319, 508, 375, 364, 341, 371, 398, 193, 375, 30, 295},
+ {351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
+ {351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395},
+ {351, 375, 373, 469, 551, 639, 477, 464, 441, 472, 498, 293, 476, 130, 395}};
+
+static void nv_gear_backoff_reseed(struct net_device *dev)
+{
+ u8 __iomem *base = get_hwbase(dev);
+ u32 miniseed1, miniseed2, miniseed2_reversed, miniseed3, miniseed3_reversed;
+ u32 temp, seedset, combinedSeed;
+ int i;
+
+ /* Setup seed for free running LFSR */
+ /* We are going to read the time stamp counter 3 times
+ and swizzle bits around to increase randomness */
+ get_random_bytes(&miniseed1, sizeof(miniseed1));
+ miniseed1 &= 0x0fff;
+ if (miniseed1 == 0)
+ miniseed1 = 0xabc;
+
+ get_random_bytes(&miniseed2, sizeof(miniseed2));
+ miniseed2 &= 0x0fff;
+ if (miniseed2 == 0)
+ miniseed2 = 0xabc;
+ miniseed2_reversed =
+ ((miniseed2 & 0xF00) >> 8) |
+ (miniseed2 & 0x0F0) |
+ ((miniseed2 & 0x00F) << 8);
+
+ get_random_bytes(&miniseed3, sizeof(miniseed3));
+ miniseed3 &= 0x0fff;
+ if (miniseed3 == 0)
+ miniseed3 = 0xabc;
+ miniseed3_reversed =
+ ((miniseed3 & 0xF00) >> 8) |
+ (miniseed3 & 0x0F0) |
+ ((miniseed3 & 0x00F) << 8);
+
+ combinedSeed = ((miniseed1 ^ miniseed2_reversed) << 12) |
+ (miniseed2 ^ miniseed3_reversed);
+
+ /* Seeds can not be zero */
+ if ((combinedSeed & NVREG_BKOFFCTRL_SEED_MASK) == 0)
+ combinedSeed |= 0x08;
+ if ((combinedSeed & (NVREG_BKOFFCTRL_SEED_MASK << NVREG_BKOFFCTRL_GEAR)) == 0)
+ combinedSeed |= 0x8000;
+
+ /* No need to disable tx here */
+ temp = NVREG_BKOFFCTRL_DEFAULT | (0 << NVREG_BKOFFCTRL_SELECT);
+ temp |= combinedSeed & NVREG_BKOFFCTRL_SEED_MASK;
+ temp |= combinedSeed >> NVREG_BKOFFCTRL_GEAR;
+ writel(temp,base + NvRegBackOffControl);
+
+ /* Setup seeds for all gear LFSRs. */
+ get_random_bytes(&seedset, sizeof(seedset));
+ seedset = seedset % BACKOFF_SEEDSET_ROWS;
+ for (i = 1; i <= BACKOFF_SEEDSET_LFSRS; i++)
+ {
+ temp = NVREG_BKOFFCTRL_DEFAULT | (i << NVREG_BKOFFCTRL_SELECT);
+ temp |= main_seedset[seedset][i-1] & 0x3ff;
+ temp |= ((gear_seedset[seedset][i-1] & 0x3ff) << NVREG_BKOFFCTRL_GEAR);
+ writel(temp, base + NvRegBackOffControl);
+ }
+}
+