MIPS: TXx9: stop_unused_modules

TXx9 SoCs have pin multiplex.  Stop some controller modules which can
not be used due to pin configurations.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/mips/txx9/generic/setup_tx4938.c b/arch/mips/txx9/generic/setup_tx4938.c
index 0d8517ad3ad0..af724e53ef91 100644
--- a/arch/mips/txx9/generic/setup_tx4938.c
+++ b/arch/mips/txx9/generic/setup_tx4938.c
@@ -334,3 +334,59 @@ void __init tx4938_mtd_init(int ch)
                 return; /* disabled */
         txx9_physmap_flash_init(ch, start, size, &pdata);
 }
+
+static void __init tx4938_stop_unused_modules(void)
+{
+        __u64 pcfg, rst = 0, ckd = 0;
+        char buf[128];
+
+        buf[0] = '\0';
+        local_irq_disable();
+        pcfg = ____raw_readq(&tx4938_ccfgptr->pcfg);
+        switch (txx9_pcode) {
+        case 0x4937:
+                if (!(pcfg & TX4938_PCFG_SEL2)) {
+                        rst |= TX4938_CLKCTR_ACLRST;
+                        ckd |= TX4938_CLKCTR_ACLCKD;
+                        strcat(buf, " ACLC");
+                }
+                break;
+        case 0x4938:
+                if (!(pcfg & TX4938_PCFG_SEL2) ||
+                    (pcfg & TX4938_PCFG_ETH0_SEL)) {
+                        rst |= TX4938_CLKCTR_ACLRST;
+                        ckd |= TX4938_CLKCTR_ACLCKD;
+                        strcat(buf, " ACLC");
+                }
+                if ((pcfg &
+                     (TX4938_PCFG_ATA_SEL | TX4938_PCFG_ISA_SEL |
+                      TX4938_PCFG_NDF_SEL))
+                    != TX4938_PCFG_NDF_SEL) {
+                        rst |= TX4938_CLKCTR_NDFRST;
+                        ckd |= TX4938_CLKCTR_NDFCKD;
+                        strcat(buf, " NDFMC");
+                }
+                if (!(pcfg & TX4938_PCFG_SPI_SEL)) {
+                        rst |= TX4938_CLKCTR_SPIRST;
+                        ckd |= TX4938_CLKCTR_SPICKD;
+                        strcat(buf, " SPI");
+                }
+                break;
+        }
+        if (rst | ckd) {
+                txx9_set64(&tx4938_ccfgptr->clkctr, rst);
+                txx9_set64(&tx4938_ccfgptr->clkctr, ckd);
+        }
+        local_irq_enable();
+        if (buf[0])
+                pr_info("%s: stop%s\n", txx9_pcode_str, buf);
+}
+
+static int __init tx4938_late_init(void)
+{
+        if (txx9_pcode != 0x4937 && txx9_pcode != 0x4938)
+                return -ENODEV;
+        tx4938_stop_unused_modules();
+        return 0;
+}
+late_initcall(tx4938_late_init);