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authorSergey Ryazanov <ryazanov.s.a@gmail.com>2014-10-29 02:18:47 +0300
committerRalf Baechle <ralf@linux-mips.org>2014-11-24 09:45:28 +0300
commit3ed7a2a702dc0f5bc44d67f27a1a289356b5dc42 (patch)
treee6be54de91de364abe733cf1b6ebec18aaf48ca1 /arch/mips/ath25
parentd58eaa7ffdcb58ab8bb95927149e2f152ec163c6 (diff)
downloadlinux-3ed7a2a702dc0f5bc44d67f27a1a289356b5dc42.tar.xz
MIPS: ath25: add AR2315 PCI host controller driver
Add PCI host controller driver and DMA address calculation hook. Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com> Cc: Linux MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/8246/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/ath25')
-rw-r--r--arch/mips/ath25/Kconfig7
-rw-r--r--arch/mips/ath25/ar2315.c57
2 files changed, 64 insertions, 0 deletions
diff --git a/arch/mips/ath25/Kconfig b/arch/mips/ath25/Kconfig
index ca3dde472bef..fc19dd57e42d 100644
--- a/arch/mips/ath25/Kconfig
+++ b/arch/mips/ath25/Kconfig
@@ -7,3 +7,10 @@ config SOC_AR2315
bool "Atheros AR2315+ SoC support"
depends on ATH25
default y
+
+config PCI_AR2315
+ bool "Atheros AR2315 PCI controller support"
+ depends on SOC_AR2315
+ select HW_HAS_PCI
+ select PCI
+ default y
diff --git a/arch/mips/ath25/ar2315.c b/arch/mips/ath25/ar2315.c
index 52805b725a67..f02478915afd 100644
--- a/arch/mips/ath25/ar2315.c
+++ b/arch/mips/ath25/ar2315.c
@@ -19,6 +19,7 @@
#include <linux/bitops.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
+#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <asm/bootinfo.h>
#include <asm/reboot.h>
@@ -133,6 +134,10 @@ static void ar2315_irq_dispatch(void)
if (pending & CAUSEF_IP3)
do_IRQ(AR2315_IRQ_WLAN0);
+#ifdef CONFIG_PCI_AR2315
+ else if (pending & CAUSEF_IP5)
+ do_IRQ(AR2315_IRQ_LCBUS_PCI);
+#endif
else if (pending & CAUSEF_IP2)
do_IRQ(AR2315_IRQ_MISC);
else if (pending & CAUSEF_IP7)
@@ -296,10 +301,62 @@ void __init ar2315_plat_mem_setup(void)
_machine_restart = ar2315_restart;
}
+#ifdef CONFIG_PCI_AR2315
+static struct resource ar2315_pci_res[] = {
+ {
+ .name = "ar2315-pci-ctrl",
+ .flags = IORESOURCE_MEM,
+ .start = AR2315_PCI_BASE,
+ .end = AR2315_PCI_BASE + AR2315_PCI_SIZE - 1,
+ },
+ {
+ .name = "ar2315-pci-ext",
+ .flags = IORESOURCE_MEM,
+ .start = AR2315_PCI_EXT_BASE,
+ .end = AR2315_PCI_EXT_BASE + AR2315_PCI_EXT_SIZE - 1,
+ },
+ {
+ .name = "ar2315-pci",
+ .flags = IORESOURCE_IRQ,
+ .start = AR2315_IRQ_LCBUS_PCI,
+ .end = AR2315_IRQ_LCBUS_PCI,
+ },
+};
+#endif
+
void __init ar2315_arch_init(void)
{
unsigned irq = irq_create_mapping(ar2315_misc_irq_domain,
AR2315_MISC_IRQ_UART0);
ath25_serial_setup(AR2315_UART0_BASE, irq, ar2315_apb_frequency());
+
+#ifdef CONFIG_PCI_AR2315
+ if (ath25_soc == ATH25_SOC_AR2315) {
+ /* Reset PCI DMA logic */
+ ar2315_rst_reg_mask(AR2315_RESET, 0, AR2315_RESET_PCIDMA);
+ msleep(20);
+ ar2315_rst_reg_mask(AR2315_RESET, AR2315_RESET_PCIDMA, 0);
+ msleep(20);
+
+ /* Configure endians */
+ ar2315_rst_reg_mask(AR2315_ENDIAN_CTL, 0, AR2315_CONFIG_PCIAHB |
+ AR2315_CONFIG_PCIAHB_BRIDGE);
+
+ /* Configure as PCI host with DMA */
+ ar2315_rst_reg_write(AR2315_PCICLK, AR2315_PCICLK_PLLC_CLKM |
+ (AR2315_PCICLK_IN_FREQ_DIV_6 <<
+ AR2315_PCICLK_DIV_S));
+ ar2315_rst_reg_mask(AR2315_AHB_ARB_CTL, 0, AR2315_ARB_PCI);
+ ar2315_rst_reg_mask(AR2315_IF_CTL, AR2315_IF_PCI_CLK_MASK |
+ AR2315_IF_MASK, AR2315_IF_PCI |
+ AR2315_IF_PCI_HOST | AR2315_IF_PCI_INTR |
+ (AR2315_IF_PCI_CLK_OUTPUT_CLK <<
+ AR2315_IF_PCI_CLK_SHIFT));
+
+ platform_device_register_simple("ar2315-pci", -1,
+ ar2315_pci_res,
+ ARRAY_SIZE(ar2315_pci_res));
+ }
+#endif
}