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>

4 files changed, 148 insertions, 0 deletions

diff --git a/arch/mips/txx9/Kconfig b/arch/mips/txx9/Kconfig
index 17052db4161d..5a176ea0bd29 100644
--- a/arch/mips/txx9/Kconfig
+++ b/arch/mips/txx9/Kconfig
@@ -49,6 +49,7 @@ config TOSHIBA_RBTX4939
         bool "Toshiba RBTX4939 bobard"
         depends on MACH_TX49XX
         select SOC_TX4939
+        select TXX9_7SEGLED
         help
           This Toshiba board is based on the TX4939 processor. Say Y here to
           support this machine type
@@ -86,6 +87,9 @@ config SOC_TX4939
         select HW_HAS_PCI
         select PCI_TX4927
 
+config TXX9_7SEGLED
+        bool
+
 config TOSHIBA_FPCIB0
         bool "FPCIB0 Backplane Support"
         depends on PCI && MACH_TXX9
diff --git a/arch/mips/txx9/generic/7segled.c b/arch/mips/txx9/generic/7segled.c
new file mode 100644
index 000000000000..727ab21b6618
--- /dev/null
+++ b/arch/mips/txx9/generic/7segled.c
@@ -0,0 +1,112 @@
+/*
+ * 7 Segment LED routines
+ * Based on RBTX49xx patch from CELF patch archive.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * (C) Copyright TOSHIBA CORPORATION 2005-2007
+ * All Rights Reserved.
+ */
+#include <linux/sysdev.h>
+#include <linux/slab.h>
+#include <linux/map_to_7segment.h>
+#include <asm/txx9/generic.h>
+
+static unsigned int tx_7segled_num;
+static void (*tx_7segled_putc)(unsigned int pos, unsigned char val);
+
+void __init txx9_7segled_init(unsigned int num,
+                              void (*putc)(unsigned int pos, unsigned char val))
+{
+        tx_7segled_num = num;
+        tx_7segled_putc = putc;
+}
+
+static SEG7_CONVERSION_MAP(txx9_seg7map, MAP_ASCII7SEG_ALPHANUM_LC);
+
+int txx9_7segled_putc(unsigned int pos, char c)
+{
+        if (pos >= tx_7segled_num)
+                return -EINVAL;
+        c = map_to_seg7(&txx9_seg7map, c);
+        if (c < 0)
+                return c;
+        tx_7segled_putc(pos, c);
+        return 0;
+}
+
+static ssize_t ascii_store(struct sys_device *dev,
+                           struct sysdev_attribute *attr,
+                           const char *buf, size_t size)
+{
+        unsigned int ch = dev->id;
+        txx9_7segled_putc(ch, buf[0]);
+        return size;
+}
+
+static ssize_t raw_store(struct sys_device *dev,
+                         struct sysdev_attribute *attr,
+                         const char *buf, size_t size)
+{
+        unsigned int ch = dev->id;
+        tx_7segled_putc(ch, buf[0]);
+        return size;
+}
+
+static SYSDEV_ATTR(ascii, 0200, NULL, ascii_store);
+static SYSDEV_ATTR(raw, 0200, NULL, raw_store);
+
+static ssize_t map_seg7_show(struct sysdev_class *class, char *buf)
+{
+        memcpy(buf, &txx9_seg7map, sizeof(txx9_seg7map));
+        return sizeof(txx9_seg7map);
+}
+
+static ssize_t map_seg7_store(struct sysdev_class *class,
+                              const char *buf, size_t size)
+{
+        if (size != sizeof(txx9_seg7map))
+                return -EINVAL;
+        memcpy(&txx9_seg7map, buf, size);
+        return size;
+}
+
+static SYSDEV_CLASS_ATTR(map_seg7, 0600, map_seg7_show, map_seg7_store);
+
+static struct sysdev_class tx_7segled_sysdev_class = {
+        .name   = "7segled",
+};
+
+static int __init tx_7segled_init_sysfs(void)
+{
+        int error, i;
+        if (!tx_7segled_num)
+                return -ENODEV;
+        error = sysdev_class_register(&tx_7segled_sysdev_class);
+        if (error)
+                return error;
+        error = sysdev_class_create_file(&tx_7segled_sysdev_class,
+                                         &attr_map_seg7);
+        if (error)
+                return error;
+        for (i = 0; i < tx_7segled_num; i++) {
+                struct sys_device *dev;
+                dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+                if (!dev) {
+                        error = -ENODEV;
+                        break;
+                }
+                dev->id = i;
+                dev->cls = &tx_7segled_sysdev_class;
+                error = sysdev_register(dev);
+                if (!error) {
+                        sysdev_create_file(dev, &attr_ascii);
+                        sysdev_create_file(dev, &attr_raw);
+                }
+        }
+        return error;
+}
+
+device_initcall(tx_7segled_init_sysfs);
diff --git a/arch/mips/txx9/generic/Makefile b/arch/mips/txx9/generic/Makefile
index 0030d23bef5b..f2579ce054a1 100644
--- a/arch/mips/txx9/generic/Makefile
+++ b/arch/mips/txx9/generic/Makefile
@@ -10,5 +10,6 @@ obj-$(CONFIG_SOC_TX4938)	+= mem_tx4927.o setup_tx4938.o irq_tx4938.o
 obj-$(CONFIG_SOC_TX4939)        += setup_tx4939.o irq_tx4939.o
 obj-$(CONFIG_TOSHIBA_FPCIB0)    += smsc_fdc37m81x.o
 obj-$(CONFIG_SPI)               += spi_eeprom.o
+obj-$(CONFIG_TXX9_7SEGLED)      += 7segled.o
 
 EXTRA_CFLAGS += -Werror
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));