MIPS: TXx9: 7 segment LED support

Add sysfs interface for 7 segment LED and implement access routine for
RBTX4939.

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

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/mips/txx9/rbtx4939/setup.c b/arch/mips/txx9/rbtx4939/setup.c
index 9855d7bccc20..c88517774910 100644
--- a/arch/mips/txx9/rbtx4939/setup.c
+++ b/arch/mips/txx9/rbtx4939/setup.c
@@ -239,6 +239,32 @@ static inline void rbtx4939_led_setup(void)
 }
 #endif
 
+static void __rbtx4939_7segled_putc(unsigned int pos, unsigned char val)
+{
+#if defined(CONFIG_LEDS_CLASS) || defined(CONFIG_LEDS_CLASS_MODULE)
+        unsigned long flags;
+        local_irq_save(flags);
+        /* bit7: reserved for LED class */
+        led_val[pos] = (led_val[pos] & 0x80) | (val & 0x7f);
+        val = led_val[pos];
+        local_irq_restore(flags);
+#endif
+        writeb(val, rbtx4939_7seg_addr(pos / 4, pos % 4));
+}
+
+static void rbtx4939_7segled_putc(unsigned int pos, unsigned char val)
+{
+        /* convert from map_to_seg7() notation */
+        val = (val & 0x88) |
+                ((val & 0x40) >> 6) |
+                ((val & 0x20) >> 4) |
+                ((val & 0x10) >> 2) |
+                ((val & 0x04) << 2) |
+                ((val & 0x02) << 4) |
+                ((val & 0x01) << 6);
+        __rbtx4939_7segled_putc(pos, val);
+}
+
 static void __init rbtx4939_arch_init(void)
 {
         rbtx4939_pci_setup();
@@ -269,6 +295,8 @@ static void __init rbtx4939_device_init(void)
 
 static void __init rbtx4939_setup(void)
 {
+        int i;
+
         rbtx4939_ebusc_setup();
         /* always enable ATA0 */
         txx9_set64(&tx4939_ccfgptr->pcfg, TX4939_PCFG_ATA0MODE);
@@ -279,6 +307,9 @@ static void __init rbtx4939_setup(void)
 
         _machine_restart = rbtx4939_machine_restart;
 
+        txx9_7segled_init(RBTX4939_MAX_7SEGLEDS, rbtx4939_7segled_putc);
+        for (i = 0; i < RBTX4939_MAX_7SEGLEDS; i++)
+                txx9_7segled_putc(i, '-');
         pr_info("RBTX4939 (Rev %02x) --- FPGA(Rev %02x) DIPSW:%02x,%02x\n",
                 readb(rbtx4939_board_rev_addr), readb(rbtx4939_ioc_rev_addr),
                 readb(rbtx4939_udipsw_addr), readb(rbtx4939_bdipsw_addr));