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atheros: ar2315-pci: rework interrupt handling

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Add PCI IRQ controller to facilitate interrupt handling, move interrupts
initialization to the IRQ controller initialization from
pcibios_plat_dev_init() callback.

Also remove odd PCI dev configuration manipulation from pcibios_plat_dev_init()
callback.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

SVN-Revision: 42501
This commit is contained in:
John Crispin 2014-09-12 06:53:00 +00:00
parent 0f645cbd83
commit dbdd8906ac
2 changed files with 101 additions and 64 deletions
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46
target/linux/atheros/patches-3.14/100-board.patch
View file

@ -674,7 +674,7 @@
+#endif /* __ASM_MACH_AR231X_WAR_H */
--- /dev/null
+++ b/arch/mips/include/asm/mach-ar231x/ar2315_regs.h
@@ -0,0 +1,614 @@
@@ -0,0 +1,624 @@
+/*
+ * Register definitions for AR2315+
+ *
@ -716,6 +716,16 @@
+#define AR2315_MISC_IRQ_COUNT 10
+
+/*
+ * PCI interrupts, which share IP5
+ * Keep ordered according to AR2315_PCI_INT_XXX bits
+ */
+#define AR2315_PCI_IRQ_BASE 0x50
+#define AR2315_PCI_IRQ_EXT (AR2315_PCI_IRQ_BASE+0)
+#define AR2315_PCI_IRQ_ABORT (AR2315_PCI_IRQ_BASE+1)
+#define AR2315_PCI_IRQ_COUNT 2
+#define AR2315_PCI_IRQ_SHIFT 25 /* in AR2315_PCI_INT_STATUS */
+
+/*
+ * Address map
+ */
+#define AR2315_SPI_READ 0x08000000 /* SPI FLASH */
@ -1138,25 +1148,25 @@
+
+#define AR2315_PCI_OUT_PTR (AR2315_PCI + 0x0408)
+
+#define AR2315_PCI_INT_STATUS (AR2315_PCI + 0x0500) /* write one to clr */
+#define AR2315_PCI_TXINT 0x00000001 /* Desc In Completed */
+#define AR2315_PCI_TXOK 0x00000002 /* Desc In OK */
+#define AR2315_PCI_TXERR 0x00000004 /* Desc In ERR */
+#define AR2315_PCI_TXEOL 0x00000008 /* Desc In End-of-List */
+#define AR2315_PCI_RXINT 0x00000010 /* Desc Out Completed */
+#define AR2315_PCI_RXOK 0x00000020 /* Desc Out OK */
+#define AR2315_PCI_RXERR 0x00000040 /* Desc Out ERR */
+#define AR2315_PCI_RXEOL 0x00000080 /* Desc Out EOL */
+#define AR2315_PCI_TXOOD 0x00000200 /* Desc In Out-of-Desc */
+#define AR2315_PCI_MASK 0x0000FFFF /* Desc Mask */
+#define AR2315_PCI_EXT_INT 0x02000000
+#define AR2315_PCI_ABORT_INT 0x04000000
+#define AR2315_PCI_ISR (AR2315_PCI + 0x0500) /* write one to clr */
+#define AR2315_PCI_INT_TX 0x00000001 /* Desc In Completed */
+#define AR2315_PCI_INT_TXOK 0x00000002 /* Desc In OK */
+#define AR2315_PCI_INT_TXERR 0x00000004 /* Desc In ERR */
+#define AR2315_PCI_INT_TXEOL 0x00000008 /* Desc In End-of-List */
+#define AR2315_PCI_INT_RX 0x00000010 /* Desc Out Completed */
+#define AR2315_PCI_INT_RXOK 0x00000020 /* Desc Out OK */
+#define AR2315_PCI_INT_RXERR 0x00000040 /* Desc Out ERR */
+#define AR2315_PCI_INT_RXEOL 0x00000080 /* Desc Out EOL */
+#define AR2315_PCI_INT_TXOOD 0x00000200 /* Desc In Out-of-Desc */
+#define AR2315_PCI_INT_DESCMASK 0x0000FFFF /* Desc Mask */
+#define AR2315_PCI_INT_EXT 0x02000000 /* Extern PCI INTA */
+#define AR2315_PCI_INT_ABORT 0x04000000 /* PCI bus abort event */
+
+#define AR2315_PCI_INT_MASK (AR2315_PCI + 0x0504) /* same as INT_STATUS */
+#define AR2315_PCI_IMR (AR2315_PCI + 0x0504) /* mask _PCI_ISR bits */
+
+#define AR2315_PCI_INTEN_REG (AR2315_PCI + 0x0508)
+#define AR2315_PCI_INT_DISABLE 0x00 /* disable pci interrupts */
+#define AR2315_PCI_INT_ENABLE 0x01 /* enable pci interrupts */
+#define AR2315_PCI_IER (AR2315_PCI + 0x0508) /* global PCI int en */
+#define AR2315_PCI_IER_DISABLE 0x00 /* disable pci interrupts */
+#define AR2315_PCI_IER_ENABLE 0x01 /* enable pci interrupts */
+
+#define AR2315_PCI_HOST_IN_EN (AR2315_PCI + 0x0800)
+#define AR2315_PCI_HOST_IN_DIS (AR2315_PCI + 0x0804)

119
target/linux/atheros/patches-3.14/105-ar2315_pci.patch
View file

@ -7,7 +7,7 @@
+obj-$(CONFIG_ATHEROS_AR2315_PCI) += pci.o
--- /dev/null
+++ b/arch/mips/ar231x/pci.c
@@ -0,0 +1,280 @@
@@ -0,0 +1,336 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
@ -174,23 +174,11 @@
+
+int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ return AR2315_IRQ_LCBUS_PCI;
+ return AR2315_PCI_IRQ_EXT;
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 5);
+ pci_write_config_word(dev, 0x40, 0);
+
+ /* Clear any pending Abort or external Interrupts
+ * and enable interrupt processing */
+ ar231x_mask_reg(AR2315_PCI_INTEN_REG, AR2315_PCI_INT_ENABLE, 0);
+ ar231x_write_reg(AR2315_PCI_INT_STATUS, (AR2315_PCI_ABORT_INT |
+ AR2315_PCI_EXT_INT));
+ ar231x_write_reg(AR2315_PCI_INT_MASK, (AR2315_PCI_ABORT_INT |
+ AR2315_PCI_EXT_INT));
+ ar231x_mask_reg(AR2315_PCI_INTEN_REG, 0, AR2315_PCI_INT_ENABLE);
+
+ return 0;
+}
+
@ -218,6 +206,72 @@
+ return 0;
+}
+
+static void ar2315_pci_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ u32 pending = ar231x_read_reg(AR2315_PCI_ISR) &
+ ar231x_read_reg(AR2315_PCI_IMR);
+
+ if (pending & AR2315_PCI_INT_EXT)
+ generic_handle_irq(AR2315_PCI_IRQ_EXT);
+ else if (pending & AR2315_PCI_INT_ABORT)
+ generic_handle_irq(AR2315_PCI_IRQ_ABORT);
+ else
+ spurious_interrupt();
+}
+
+static void ar2315_pci_irq_mask(struct irq_data *d)
+{
+ u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
+
+ ar231x_mask_reg(AR2315_PCI_IMR, m, 0);
+}
+
+static void ar2315_pci_irq_mask_ack(struct irq_data *d)
+{
+ u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
+
+ ar231x_mask_reg(AR2315_PCI_IMR, m, 0);
+ ar231x_write_reg(AR2315_PCI_ISR, m);
+}
+
+static void ar2315_pci_irq_unmask(struct irq_data *d)
+{
+ u32 m = 1 << (d->irq - AR2315_PCI_IRQ_BASE + AR2315_PCI_IRQ_SHIFT);
+
+ ar231x_mask_reg(AR2315_PCI_IMR, 0, m);
+}
+
+static struct irq_chip ar2315_pci_irq_chip = {
+ .name = "AR2315-PCI",
+ .irq_mask = ar2315_pci_irq_mask,
+ .irq_mask_ack = ar2315_pci_irq_mask_ack,
+ .irq_unmask = ar2315_pci_irq_unmask,
+};
+
+static void ar2315_pci_irq_init(void)
+{
+ int i;
+
+ ar231x_mask_reg(AR2315_PCI_IER, AR2315_PCI_IER_ENABLE, 0);
+ ar231x_mask_reg(AR2315_PCI_IMR, (AR2315_PCI_INT_ABORT |
+ AR2315_PCI_INT_EXT), 0);
+
+ for (i = 0; i < AR2315_PCI_IRQ_COUNT; ++i) {
+ int irq = AR2315_PCI_IRQ_BASE + i;
+
+ irq_set_chip_and_handler(irq, &ar2315_pci_irq_chip,
+ handle_level_irq);
+ }
+
+ irq_set_chained_handler(AR2315_IRQ_LCBUS_PCI, ar2315_pci_irq_handler);
+
+ /* Clear any pending Abort or external Interrupts
+ * and enable interrupt processing */
+ ar231x_write_reg(AR2315_PCI_ISR, (AR2315_PCI_INT_ABORT |
+ AR2315_PCI_INT_EXT));
+ ar231x_mask_reg(AR2315_PCI_IER, 0, AR2315_PCI_IER_ENABLE);
+}
+
+static int __init
+ar2315_pci_init(void)
+{
@ -235,9 +289,9 @@
+ AR2315_MEM_SIZE, AR2315_IO_SIZE);
+ set_io_port_base(ar2315_pci_controller.io_map_base); /* PCI I/O space*/
+
+ /* Reset PCI DMA logic */
+ reg = ar231x_mask_reg(AR2315_RESET, 0, AR2315_RESET_PCIDMA);
+ msleep(20);
+
+ reg &= ~AR2315_RESET_PCIDMA;
+ ar231x_write_reg(AR2315_RESET, reg);
+ msleep(20);
@ -278,6 +332,8 @@
+ if (res)
+ goto error;
+
+ ar2315_pci_irq_init();
+
+ register_pci_controller(&ar2315_pci_controller);
+
+ return 0;
@ -303,42 +359,13 @@
+ default y
--- a/arch/mips/ar231x/ar2315.c
+++ b/arch/mips/ar231x/ar2315.c
@@ -87,6 +87,28 @@ static void ar2315_misc_irq_handler(unsi
do_IRQ(AR2315_MISC_IRQ_NONE);
}
+#ifdef CONFIG_ATHEROS_AR2315_PCI
+static inline void pci_abort_irq(void)
+{
+ ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_ABORT_INT);
+}
+
+static inline void pci_ack_irq(void)
+{
+ ar231x_write_reg(AR2315_PCI_INT_STATUS, AR2315_PCI_EXT_INT);
+}
+
+static void ar2315_pci_irq(int irq)
+{
+ if (ar231x_read_reg(AR2315_PCI_INT_STATUS) == AR2315_PCI_ABORT_INT)
+ pci_abort_irq();
+ else {
+ do_IRQ(irq);
+ pci_ack_irq();
+ }
+}
+#endif /* CONFIG_ATHEROS_AR2315_PCI */
+
/*
* Called when an interrupt is received, this function
* determines exactly which interrupt it was, and it
@@ -104,6 +126,10 @@ ar2315_irq_dispatch(void)
@@ -104,6 +104,10 @@ ar2315_irq_dispatch(void)
do_IRQ(AR2315_IRQ_WLAN0_INTRS);
else if (pending & CAUSEF_IP4)
do_IRQ(AR2315_IRQ_ENET0_INTRS);
+#ifdef CONFIG_ATHEROS_AR2315_PCI
+ else if (pending & CAUSEF_IP5)
+ ar2315_pci_irq(AR2315_IRQ_LCBUS_PCI);
+ do_IRQ(AR2315_IRQ_LCBUS_PCI);
+#endif
else if (pending & CAUSEF_IP2)
do_IRQ(AR2315_IRQ_MISC_INTRS);