Blackfin: add support for the on-chip MAC status interrupts

This patch provides infrastructure for MAC Wake-On-Lan and PHYINT use in
phylib.  New Interrupts added:

IRQ_MAC_PHYINT   /* PHY_INT Interrupt */
IRQ_MAC_MMCINT   /* MMC Counter Interrupt */
IRQ_MAC_RXFSINT  /* RX Frame-Status Interrupt */
IRQ_MAC_TXFSINT  /* TX Frame-Status Interrupt */
IRQ_MAC_WAKEDET  /* Wake-Up Interrupt */
IRQ_MAC_RXDMAERR /* RX DMA Direction Error Interrupt */
IRQ_MAC_TXDMAERR /* TX DMA Direction Error Interrupt */
IRQ_MAC_STMDONE  /* Station Mgt. Transfer Done Interrupt */

On BF537/6 the implementation is not straight forward since there are now
two chained chained_handlers.  A cleaner approach would have been to add
latter IRQs to the demux of IRQ_GENERIC_ERROR.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 136 insertions, 4 deletions

diff --git a/arch/blackfin/mach-common/ints-priority.c b/arch/blackfin/mach-common/ints-priority.c
index ebf886091187..11c05f3e178b 100644
--- a/arch/blackfin/mach-common/ints-priority.c
+++ b/arch/blackfin/mach-common/ints-priority.c
@@ -325,7 +325,6 @@ static int error_int_mask;
 static void bfin_generic_error_mask_irq(unsigned int irq)
 {
         error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
-
         if (!error_int_mask)
                 bfin_internal_mask_irq(IRQ_GENERIC_ERROR);
 }
@@ -416,6 +415,127 @@ static void bfin_demux_error_irq(unsigned int int_err_irq,
 }
 #endif                          /* BF537_GENERIC_ERROR_INT_DEMUX */
 
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+static int mac_stat_int_mask;
+
+static void bfin_mac_status_ack_irq(unsigned int irq)
+{
+        switch (irq) {
+        case IRQ_MAC_MMCINT:
+                bfin_write_EMAC_MMC_TIRQS(
+                        bfin_read_EMAC_MMC_TIRQE() &
+                        bfin_read_EMAC_MMC_TIRQS());
+                bfin_write_EMAC_MMC_RIRQS(
+                        bfin_read_EMAC_MMC_RIRQE() &
+                        bfin_read_EMAC_MMC_RIRQS());
+                break;
+        case IRQ_MAC_RXFSINT:
+                bfin_write_EMAC_RX_STKY(
+                        bfin_read_EMAC_RX_IRQE() &
+                        bfin_read_EMAC_RX_STKY());
+                break;
+        case IRQ_MAC_TXFSINT:
+                bfin_write_EMAC_TX_STKY(
+                        bfin_read_EMAC_TX_IRQE() &
+                        bfin_read_EMAC_TX_STKY());
+                break;
+        case IRQ_MAC_WAKEDET:
+                 bfin_write_EMAC_WKUP_CTL(
+                        bfin_read_EMAC_WKUP_CTL() | MPKS | RWKS);
+                break;
+        default:
+                /* These bits are W1C */
+                bfin_write_EMAC_SYSTAT(1L << (irq - IRQ_MAC_PHYINT));
+                break;
+        }
+}
+
+static void bfin_mac_status_mask_irq(unsigned int irq)
+{
+        mac_stat_int_mask &= ~(1L << (irq - IRQ_MAC_PHYINT));
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+        switch (irq) {
+        case IRQ_MAC_PHYINT:
+                bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() & ~PHYIE);
+                break;
+        default:
+                break;
+        }
+#else
+        if (!mac_stat_int_mask)
+                bfin_internal_mask_irq(IRQ_MAC_ERROR);
+#endif
+        bfin_mac_status_ack_irq(irq);
+}
+
+static void bfin_mac_status_unmask_irq(unsigned int irq)
+{
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+        switch (irq) {
+        case IRQ_MAC_PHYINT:
+                bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() | PHYIE);
+                break;
+        default:
+                break;
+        }
+#else
+        if (!mac_stat_int_mask)
+                bfin_internal_unmask_irq(IRQ_MAC_ERROR);
+#endif
+        mac_stat_int_mask |= 1L << (irq - IRQ_MAC_PHYINT);
+}
+
+#ifdef CONFIG_PM
+int bfin_mac_status_set_wake(unsigned int irq, unsigned int state)
+{
+#ifdef BF537_GENERIC_ERROR_INT_DEMUX
+        return bfin_internal_set_wake(IRQ_GENERIC_ERROR, state);
+#else
+        return bfin_internal_set_wake(IRQ_MAC_ERROR, state);
+#endif
+}
+#endif
+
+static struct irq_chip bfin_mac_status_irqchip = {
+        .name = "MACST",
+        .ack = bfin_ack_noop,
+        .mask_ack = bfin_mac_status_mask_irq,
+        .mask = bfin_mac_status_mask_irq,
+        .unmask = bfin_mac_status_unmask_irq,
+#ifdef CONFIG_PM
+        .set_wake = bfin_mac_status_set_wake,
+#endif
+};
+
+static void bfin_demux_mac_status_irq(unsigned int int_err_irq,
+                                 struct irq_desc *inta_desc)
+{
+        int i, irq = 0;
+        u32 status = bfin_read_EMAC_SYSTAT();
+
+        for (i = 0; i < (IRQ_MAC_STMDONE - IRQ_MAC_PHYINT); i++)
+                if (status & (1L << i)) {
+                        irq = IRQ_MAC_PHYINT + i;
+                        break;
+                }
+
+        if (irq) {
+                if (mac_stat_int_mask & (1L << (irq - IRQ_MAC_PHYINT))) {
+                        bfin_handle_irq(irq);
+                } else {
+                        bfin_mac_status_ack_irq(irq);
+                        pr_debug("IRQ %d:"
+                                 " MASKED MAC ERROR INTERRUPT ASSERTED\n",
+                                 irq);
+                }
+        } else
+                printk(KERN_ERR
+                       "%s : %s : LINE %d :\nIRQ ?: MAC ERROR"
+                       " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
+                       __func__, __FILE__, __LINE__);
+}
+#endif
+
 static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
 {
 #ifdef CONFIG_IPIPE
@@ -1070,7 +1190,11 @@ int __init init_arch_irq(void)
                         set_irq_chained_handler(irq, bfin_demux_error_irq);
                         break;
 #endif
-
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+                case IRQ_MAC_ERROR:
+                        set_irq_chained_handler(irq, bfin_demux_mac_status_irq);
+                        break;
+#endif
 #ifdef CONFIG_SMP
                 case IRQ_SUPPLE_0:
                 case IRQ_SUPPLE_1:
@@ -1111,14 +1235,22 @@ int __init init_arch_irq(void)
         for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++)
                 set_irq_chip_and_handler(irq, &bfin_generic_error_irqchip,
                                          handle_level_irq);
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+        set_irq_chained_handler(IRQ_MAC_ERROR, bfin_demux_mac_status_irq);
+#endif
 #endif
 
+#if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
+        for (irq = IRQ_MAC_PHYINT; irq <= IRQ_MAC_STMDONE; irq++)
+                set_irq_chip_and_handler(irq, &bfin_mac_status_irqchip,
+                                         handle_level_irq);
+#endif
         /* if configured as edge, then will be changed to do_edge_IRQ */
-        for (irq = GPIO_IRQ_BASE; irq < NR_MACH_IRQS; irq++)
+        for (irq = GPIO_IRQ_BASE;
+                irq < (GPIO_IRQ_BASE + MAX_BLACKFIN_GPIOS); irq++)
                 set_irq_chip_and_handler(irq, &bfin_gpio_irqchip,
                                          handle_level_irq);
 
-
         bfin_write_IMASK(0);
         CSYNC();
         ilat = bfin_read_ILAT();