-/* Set the PAD MUX to route the MMC reader correctly to GPIO0. */
-void pmx_set_mission_mode_mmc(void)
-{
- u16 val;
-
- val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
- val &= ~U300_SYSCON_PMC1LR_MMCSD_MASK;
- writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1LR);
- val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
- val &= ~U300_SYSCON_PMC1HR_APP_GPIO_1_MASK;
- val |= U300_SYSCON_PMC1HR_APP_GPIO_1_MMC;
- writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
-}
-
-void pmx_set_mission_mode_spi(void)
-{
- u16 val;
-
- /* Set up padmuxing so the SPI port and its chipselects are active */
- val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
- /*
- * Activate the SPI port (disable the use of these pins for generic
- * GPIO, DSP, AAIF
- */
- val &= ~U300_SYSCON_PMC1HR_APP_SPI_2_MASK;
- val |= U300_SYSCON_PMC1HR_APP_SPI_2_SPI;
- /*
- * Use GPIO pin SPI CS1 for CS1 actually (it can be used for other
- * things also)
- */
- val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK;
- val |= U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI;
- /*
- * Use GPIO pin SPI CS2 for CS2 actually (it can be used for other
- * things also)
- */
- val &= ~U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK;
- val |= U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI;
- writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMC1HR);
+static DEFINE_MUTEX(pmx_mutex);
+
+const u32 pmx_registers[] = {
+ (U300_SYSCON_VBASE + U300_SYSCON_PMC1LR),
+ (U300_SYSCON_VBASE + U300_SYSCON_PMC1HR),
+ (U300_SYSCON_VBASE + U300_SYSCON_PMC2R),
+ (U300_SYSCON_VBASE + U300_SYSCON_PMC3R),
+ (U300_SYSCON_VBASE + U300_SYSCON_PMC4R)
+};
+
+/* High level functionality */
+
+/* Lazy dog:
+ * onmask = {
+ * {"PMC1LR" mask, "PMC1LR" value},
+ * {"PMC1HR" mask, "PMC1HR" value},
+ * {"PMC2R" mask, "PMC2R" value},
+ * {"PMC3R" mask, "PMC3R" value},
+ * {"PMC4R" mask, "PMC4R" value}
+ * }
+ */
+static struct pmx mmc_setting = {
+ .setting = U300_APP_PMX_MMC_SETTING,
+ .default_on = false,
+ .activated = false,
+ .name = "MMC",
+ .onmask = {
+ {U300_SYSCON_PMC1LR_MMCSD_MASK,
+ U300_SYSCON_PMC1LR_MMCSD_MMCSD},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {U300_SYSCON_PMC4R_APP_MISC_12_MASK,
+ U300_SYSCON_PMC4R_APP_MISC_12_APP_GPIO}
+ },
+};
+
+static struct pmx spi_setting = {
+ .setting = U300_APP_PMX_SPI_SETTING,
+ .default_on = false,
+ .activated = false,
+ .name = "SPI",
+ .onmask = {{0, 0},
+ {U300_SYSCON_PMC1HR_APP_SPI_2_MASK |
+ U300_SYSCON_PMC1HR_APP_SPI_CS_1_MASK |
+ U300_SYSCON_PMC1HR_APP_SPI_CS_2_MASK,
+ U300_SYSCON_PMC1HR_APP_SPI_2_SPI |
+ U300_SYSCON_PMC1HR_APP_SPI_CS_1_SPI |
+ U300_SYSCON_PMC1HR_APP_SPI_CS_2_SPI},
+ {0, 0},
+ {0, 0},
+ {0, 0}
+ },
+};
+
+/* Available padmux settings */
+static struct pmx *pmx_settings[] = {
+ &mmc_setting,
+ &spi_setting,
+};
+
+static void update_registers(struct pmx *pmx, bool activate)
+{
+ u16 regval, val, mask;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pmx_registers); i++) {
+ if (activate)
+ val = pmx->onmask[i].val;
+ else
+ val = 0;
+
+ mask = pmx->onmask[i].mask;
+ if (mask != 0) {
+ regval = readw(pmx_registers[i]);
+ regval &= ~mask;
+ regval |= val;
+ writew(regval, pmx_registers[i]);
+ }
+ }
+}
+
+struct pmx *pmx_get(struct device *dev, enum pmx_settings setting)
+{
+ int i;
+ struct pmx *pmx = ERR_PTR(-ENOENT);
+
+ if (dev == NULL)
+ return ERR_PTR(-EINVAL);
+
+ mutex_lock(&pmx_mutex);
+ for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
+
+ if (setting == pmx_settings[i]->setting) {
+
+ if (pmx_settings[i]->dev != NULL) {
+ WARN(1, "padmux: required setting "
+ "in use by another consumer\n");
+ } else {
+ pmx = pmx_settings[i];
+ pmx->dev = dev;
+ dev_dbg(dev, "padmux: setting nr %d is now "
+ "bound to %s and ready to use\n",
+ setting, dev_name(dev));
+ break;
+ }
+ }
+ }
+ mutex_unlock(&pmx_mutex);
+
+ return pmx;
+}
+EXPORT_SYMBOL(pmx_get);
+
+int pmx_put(struct device *dev, struct pmx *pmx)
+{
+ int i;
+ int ret = -ENOENT;
+
+ if (pmx == NULL || dev == NULL)
+ return -EINVAL;
+
+ mutex_lock(&pmx_mutex);
+ for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
+
+ if (pmx->setting == pmx_settings[i]->setting) {
+
+ if (dev != pmx->dev) {
+ WARN(1, "padmux: cannot release handle as "
+ "it is bound to another consumer\n");
+ ret = -EINVAL;
+ break;
+ } else {
+ pmx_settings[i]->dev = NULL;
+ ret = 0;
+ break;
+ }
+ }
+ }
+ mutex_unlock(&pmx_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(pmx_put);
+
+int pmx_activate(struct device *dev, struct pmx *pmx)
+{
+ int i, j, ret;
+ ret = 0;
+
+ if (pmx == NULL || dev == NULL)
+ return -EINVAL;
+
+ mutex_lock(&pmx_mutex);
+
+ /* Make sure the required bits are not used */
+ for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
+
+ if (pmx_settings[i]->dev == NULL || pmx_settings[i] == pmx)
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
+
+ if (pmx_settings[i]->onmask[j].mask & pmx->
+ onmask[j].mask) {
+ /* More than one entry on the same bits */
+ WARN(1, "padmux: cannot activate "
+ "setting. Bit conflict with "
+ "an active setting\n");
+
+ ret = -EUSERS;
+ goto exit;
+ }
+ }
+ }
+ update_registers(pmx, true);
+ pmx->activated = true;
+ dev_dbg(dev, "padmux: setting nr %d is activated\n",
+ pmx->setting);
+
+exit:
+ mutex_unlock(&pmx_mutex);
+ return ret;
+}
+EXPORT_SYMBOL(pmx_activate);
+
+int pmx_deactivate(struct device *dev, struct pmx *pmx)
+{
+ int i;
+ int ret = -ENOENT;
+
+ if (pmx == NULL || dev == NULL)
+ return -EINVAL;
+
+ mutex_lock(&pmx_mutex);
+ for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
+
+ if (pmx_settings[i]->dev == NULL)
+ continue;
+
+ if (pmx->setting == pmx_settings[i]->setting) {
+
+ if (dev != pmx->dev) {
+ WARN(1, "padmux: cannot deactivate "
+ "pmx setting as it was activated "
+ "by another consumer\n");
+
+ ret = -EBUSY;
+ continue;
+ } else {
+ update_registers(pmx, false);
+ pmx_settings[i]->dev = NULL;
+ pmx->activated = false;
+ ret = 0;
+ dev_dbg(dev, "padmux: setting nr %d is deactivated",
+ pmx->setting);
+ break;
+ }
+ }
+ }
+ mutex_unlock(&pmx_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(pmx_deactivate);
+
+/*
+ * For internal use only. If it is to be exported,
+ * it should be reentrant. Notice that pmx_activate
+ * (i.e. runtime settings) always override default settings.
+ */
+static int pmx_set_default(void)
+{
+ /* Used to identify several entries on the same bits */
+ u16 modbits[ARRAY_SIZE(pmx_registers)];
+
+ int i, j;
+
+ memset(modbits, 0, ARRAY_SIZE(pmx_registers) * sizeof(u16));
+
+ for (i = 0; i < ARRAY_SIZE(pmx_settings); i++) {
+
+ if (!pmx_settings[i]->default_on)
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(pmx_registers); j++) {
+
+ /* Make sure there is only one entry on the same bits */
+ if (modbits[j] & pmx_settings[i]->onmask[j].mask) {
+ BUG();
+ return -EUSERS;
+ }
+ modbits[j] |= pmx_settings[i]->onmask[j].mask;
+ }
+ update_registers(pmx_settings[i], true);
+ }
+ return 0;