diff options
Diffstat (limited to 'drivers/mailbox/mailbox-mpfs.c')
| -rw-r--r-- | drivers/mailbox/mailbox-mpfs.c | 81 |
1 files changed, 67 insertions, 14 deletions
diff --git a/drivers/mailbox/mailbox-mpfs.c b/drivers/mailbox/mailbox-mpfs.c index 20ee283a04cc..4df546e3b7ea 100644 --- a/drivers/mailbox/mailbox-mpfs.c +++ b/drivers/mailbox/mailbox-mpfs.c @@ -13,12 +13,15 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> +#include <linux/regmap.h> #include <linux/interrupt.h> +#include <linux/mfd/syscon.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <linux/mailbox_controller.h> #include <soc/microchip/mpfs.h> +#define MESSAGE_INT_OFFSET 0x18cu #define SERVICES_CR_OFFSET 0x50u #define SERVICES_SR_OFFSET 0x54u #define MAILBOX_REG_OFFSET 0x800u @@ -68,6 +71,7 @@ struct mpfs_mbox { void __iomem *int_reg; struct mbox_chan chans[1]; struct mpfs_mss_response *response; + struct regmap *sysreg_scb, *control_scb; u16 resp_offset; }; @@ -75,7 +79,10 @@ static bool mpfs_mbox_busy(struct mpfs_mbox *mbox) { u32 status; - status = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET); + if (mbox->control_scb) + regmap_read(mbox->control_scb, SERVICES_SR_OFFSET, &status); + else + status = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET); return status & SCB_STATUS_BUSY_MASK; } @@ -95,7 +102,11 @@ static bool mpfs_mbox_last_tx_done(struct mbox_chan *chan) * Failed services are intended to generated interrupts, but in reality * this does not happen, so the status must be checked here. */ - val = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET); + if (mbox->control_scb) + regmap_read(mbox->control_scb, SERVICES_SR_OFFSET, &val); + else + val = readl_relaxed(mbox->ctrl_base + SERVICES_SR_OFFSET); + response->resp_status = (val & SCB_STATUS_MASK) >> SCB_STATUS_POS; return true; @@ -143,7 +154,12 @@ static int mpfs_mbox_send_data(struct mbox_chan *chan, void *data) tx_trigger = (opt_sel << SCB_CTRL_POS) & SCB_CTRL_MASK; tx_trigger |= SCB_CTRL_REQ_MASK | SCB_STATUS_NOTIFY_MASK; - writel_relaxed(tx_trigger, mbox->ctrl_base + SERVICES_CR_OFFSET); + + if (mbox->control_scb) + regmap_write(mbox->control_scb, SERVICES_CR_OFFSET, tx_trigger); + else + writel_relaxed(tx_trigger, mbox->ctrl_base + SERVICES_CR_OFFSET); + return 0; } @@ -185,7 +201,10 @@ static irqreturn_t mpfs_mbox_inbox_isr(int irq, void *data) struct mbox_chan *chan = data; struct mpfs_mbox *mbox = (struct mpfs_mbox *)chan->con_priv; - writel_relaxed(0, mbox->int_reg); + if (mbox->control_scb) + regmap_write(mbox->sysreg_scb, MESSAGE_INT_OFFSET, 0); + else + writel_relaxed(0, mbox->int_reg); mpfs_mbox_rx_data(chan); @@ -221,28 +240,62 @@ static const struct mbox_chan_ops mpfs_mbox_ops = { .last_tx_done = mpfs_mbox_last_tx_done, }; -static int mpfs_mbox_probe(struct platform_device *pdev) +static inline int mpfs_mbox_syscon_probe(struct mpfs_mbox *mbox, struct platform_device *pdev) { - struct mpfs_mbox *mbox; - struct resource *regs; - int ret; + mbox->control_scb = syscon_regmap_lookup_by_compatible("microchip,mpfs-control-scb"); + if (IS_ERR(mbox->control_scb)) + return PTR_ERR(mbox->control_scb); - mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox), GFP_KERNEL); - if (!mbox) - return -ENOMEM; + mbox->sysreg_scb = syscon_regmap_lookup_by_compatible("microchip,mpfs-sysreg-scb"); + if (IS_ERR(mbox->sysreg_scb)) + return PTR_ERR(mbox->sysreg_scb); + + mbox->mbox_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mbox->ctrl_base)) + return PTR_ERR(mbox->mbox_base); + + return 0; +} + +static inline int mpfs_mbox_old_format_probe(struct mpfs_mbox *mbox, struct platform_device *pdev) +{ + dev_warn(&pdev->dev, "falling back to old devicetree format"); - mbox->ctrl_base = devm_platform_get_and_ioremap_resource(pdev, 0, ®s); + mbox->ctrl_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(mbox->ctrl_base)) return PTR_ERR(mbox->ctrl_base); - mbox->int_reg = devm_platform_get_and_ioremap_resource(pdev, 1, ®s); + mbox->int_reg = devm_platform_ioremap_resource(pdev, 1); if (IS_ERR(mbox->int_reg)) return PTR_ERR(mbox->int_reg); - mbox->mbox_base = devm_platform_get_and_ioremap_resource(pdev, 2, ®s); + mbox->mbox_base = devm_platform_ioremap_resource(pdev, 2); if (IS_ERR(mbox->mbox_base)) // account for the old dt-binding w/ 2 regs mbox->mbox_base = mbox->ctrl_base + MAILBOX_REG_OFFSET; + return 0; +} + +static int mpfs_mbox_probe(struct platform_device *pdev) +{ + struct mpfs_mbox *mbox; + int ret; + + mbox = devm_kzalloc(&pdev->dev, sizeof(*mbox), GFP_KERNEL); + if (!mbox) + return -ENOMEM; + + ret = mpfs_mbox_syscon_probe(mbox, pdev); + if (ret) { + /* + * set this to null, so it can be used as the decision for to + * regmap or not to regmap + */ + mbox->control_scb = NULL; + ret = mpfs_mbox_old_format_probe(mbox, pdev); + if (ret) + return ret; + } mbox->irq = platform_get_irq(pdev, 0); if (mbox->irq < 0) return mbox->irq; |