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authorTimur Tabi <timur@freescale.com>2011-04-01 13:19:36 -0500
committerKumar Gala <galak@kernel.crashing.org>2011-04-28 22:09:23 -0500
commitda30b9fd97f031a6b6863359f3d4c6633e5c7035 (patch)
tree8193ca2746ebc44306440f5e203f954e95d88586 /arch/powerpc
parent82c9dfdc20b1bf86e732e61e7230cfa7c933247f (diff)
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powerpc/85xx: Implement work-around for P4080 erratum SERDES-A005
SerDes PLL bandwidth default setting is incorrect when no lanes are configured as PCI Express. Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/cpu/mpc85xx/cmd_errata.c3
-rw-r--r--arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c48
-rw-r--r--arch/powerpc/include/asm/config_mpc85xx.h1
3 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 0564816..7b9f773 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -47,6 +47,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#if defined(CONFIG_SYS_P4080_ERRATUM_SERDES9)
puts("Work-around for Erratum SERDES9 enabled\n");
#endif
+#if defined(CONFIG_SYS_P4080_ERRATUM_SERDES_A005)
+ puts("Work-around for Erratum SERDES-A005 enabled\n");
+#endif
#if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
puts("Work-around for Erratum CPU22 enabled\n");
#endif
diff --git a/arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c b/arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c
index d39f963..edacdb8 100644
--- a/arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c
+++ b/arch/powerpc/cpu/mpc85xx/fsl_corenet_serdes.c
@@ -386,6 +386,52 @@ static void p4080_erratum_serdes8(serdes_corenet_t *regs, ccsr_gur_t *gur,
}
#endif
+#ifdef CONFIG_SYS_P4080_ERRATUM_SERDES_A005
+/*
+ * If PCIe is not selected as a protocol for any lanes driven by a given PLL,
+ * that PLL should have SRDSBnPLLCR1[PLLBW_SEL] = 0.
+ */
+static void p4080_erratum_serdes_a005(serdes_corenet_t *regs, unsigned int cfg)
+{
+ enum srds_prtcl device;
+
+ switch (cfg) {
+ case 0x13:
+ case 0x16:
+ /*
+ * If SRDS_PRTCL = 0x13 or 0x16, set SRDSB1PLLCR1[PLLBW_SEL]
+ * to 0.
+ */
+ clrbits_be32(&regs->bank[FSL_SRDS_BANK_1].pllcr1,
+ SRDS_PLLCR1_PLL_BWSEL);
+ break;
+ case 0x19:
+ /*
+ * If SRDS_PRTCL = 0x19, set SRDSB1PLLCR1[PLLBW_SEL] to 0 and
+ * SRDSB3PLLCR1[PLLBW_SEL] to 1.
+ */
+ clrbits_be32(&regs->bank[FSL_SRDS_BANK_1].pllcr1,
+ SRDS_PLLCR1_PLL_BWSEL);
+ setbits_be32(&regs->bank[FSL_SRDS_BANK_3].pllcr1,
+ SRDS_PLLCR1_PLL_BWSEL);
+ break;
+ }
+
+ /*
+ * Set SRDSBnPLLCR1[PLLBW_SEL] to 0 for each bank that selects XAUI
+ * before XAUI is initialized.
+ */
+ for (device = XAUI_FM1; device <= XAUI_FM2; device++) {
+ if (is_serdes_configured(device)) {
+ int bank = serdes_get_bank_by_device(cfg, device);
+
+ clrbits_be32(&regs->bank[bank].pllcr1,
+ SRDS_PLLCR1_PLL_BWSEL);
+ }
+ }
+}
+#endif
+
void fsl_serdes_init(void)
{
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
@@ -570,6 +616,8 @@ void fsl_serdes_init(void)
puts("\n");
#endif
+#ifdef CONFIG_SYS_P4080_ERRATUM_SERDES_A005
+ p4080_erratum_serdes_a005(srds_regs, cfg);
#endif
for (idx = 0; idx < SRDS_MAX_BANK; idx++) {
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index da2e998..b8b8914 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -311,6 +311,7 @@
#define CONFIG_SYS_P4080_ERRATUM_CPU22
#define CONFIG_SYS_P4080_ERRATUM_SERDES8
#define CONFIG_SYS_P4080_ERRATUM_SERDES9
+#define CONFIG_SYS_P4080_ERRATUM_SERDES_A005
/* P5010 is single core version of P5020 */
#elif defined(CONFIG_PPC_P5010)