pinctrl: pinctrl-single: Add 'pinctrl-single, bits' support

The TI Davinci (da850/l138/am1808) use pinctrl-single,bits for
pinmuxing peripherals.  This patch allosw the pinctrl-single
driver to parse the pinctrl-single,bits options and correctly
setup devices.

Signed-off-by: Adam Ford <aford173@gmail.com>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 9dec88c..1dfc97d 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -16,6 +16,7 @@ struct single_pdata {
        int offset;             /* index of last configuration register */
        u32 mask;               /* configuration-value mask bits */
        int width;              /* configuration register bit width */
+       bool bits_per_mux;
 };
 
 struct single_fdt_pin_cfg {
@@ -23,6 +24,12 @@ struct single_fdt_pin_cfg {
        fdt32_t val;            /* configuration register value */
 };
 
+struct single_fdt_bits_cfg {
+       fdt32_t reg;            /* configuration register offset */
+       fdt32_t val;            /* configuration register value */
+       fdt32_t mask;           /* configuration register mask */
+};
+
 /**
  * single_configure_pins() - Configure pins based on FDT data
  *
@@ -71,15 +78,53 @@ static int single_configure_pins(struct udevice *dev,
        return 0;
 }
 
+static int single_configure_bits(struct udevice *dev,
+                                const struct single_fdt_bits_cfg *pins,
+                                int size)
+{
+       struct single_pdata *pdata = dev->platdata;
+       int count = size / sizeof(struct single_fdt_bits_cfg);
+       phys_addr_t n, reg;
+       u32 val, mask;
+
+       for (n = 0; n < count; n++, pins++) {
+               reg = fdt32_to_cpu(pins->reg);
+               if ((reg < 0) || (reg > pdata->offset)) {
+                       dev_dbg(dev, "  invalid register offset 0x%pa\n", &reg);
+                       continue;
+               }
+               reg += pdata->base;
+
+               mask = fdt32_to_cpu(pins->mask);
+               val = fdt32_to_cpu(pins->val) & mask;
+
+               switch (pdata->width) {
+               case 16:
+                       writew((readw(reg) & ~mask) | val, reg);
+                       break;
+               case 32:
+                       writel((readl(reg) & ~mask) | val, reg);
+                       break;
+               default:
+                       dev_warn(dev, "unsupported register width %i\n",
+                                pdata->width);
+                       continue;
+               }
+               dev_dbg(dev, "  reg/val 0x%pa/0x%08x\n", &reg, val);
+       }
+       return 0;
+}
 static int single_set_state(struct udevice *dev,
                            struct udevice *config)
 {
        const void *fdt = gd->fdt_blob;
        const struct single_fdt_pin_cfg *prop;
+       const struct single_fdt_bits_cfg *prop_bits;
        int len;
 
        prop = fdt_getprop(fdt, dev_of_offset(config), "pinctrl-single,pins",
                           &len);
+
        if (prop) {
                dev_dbg(dev, "configuring pins for %s\n", config->name);
                if (len % sizeof(struct single_fdt_pin_cfg)) {
@@ -87,9 +132,24 @@ static int single_set_state(struct udevice *dev,
                        return -FDT_ERR_BADSTRUCTURE;
                }
                single_configure_pins(dev, prop, len);
-               len = 0;
+               return 0;
        }
 
+       /* pinctrl-single,pins not found so check for pinctrl-single,bits */
+       prop_bits = fdt_getprop(fdt, dev_of_offset(config),
+                               "pinctrl-single,bits",
+                                   &len);
+       if (prop_bits) {
+               dev_dbg(dev, "configuring pins for %s\n", config->name);
+               if (len % sizeof(struct single_fdt_bits_cfg)) {
+                       dev_dbg(dev, "  invalid bits configuration in fdt\n");
+                       return -FDT_ERR_BADSTRUCTURE;
+               }
+               single_configure_bits(dev, prop_bits, len);
+               return 0;
+       }
+
+       /* Neither 'pinctrl-single,pins' nor 'pinctrl-single,bits' were found */
        return len;
 }
 
@@ -119,6 +179,9 @@ static int single_ofdata_to_platdata(struct udevice *dev)
        pdata->mask = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev),
                                     "pinctrl-single,function-mask",
                                     0xffffffff);
+       pdata->bits_per_mux = fdtdec_get_bool(gd->fdt_blob, dev_of_offset(dev),
+                                             "pinctrl-single,bit-per-mux");
+
        return 0;
 }