x86: qemu: move x86 specific operations out of qfw core

The original implementation of qfw includes several x86 specific
operations, like directly calling outb/inb and using some inline
assembly code which prevents it being ported to other architectures.

This patch adds callback functions and moves those to arch/x86/

Signed-off-by: Miao Yan <yanmiaobest@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 38 insertions, 1 deletions

diff --git a/arch/x86/cpu/qemu/qemu.c b/arch/x86/cpu/qemu/qemu.c
index 32a4351874..6ff99474bf 100644
--- a/arch/x86/cpu/qemu/qemu.c
+++ b/arch/x86/cpu/qemu/qemu.c
@@ -15,6 +15,43 @@
 
 static bool i440fx;
 
+#ifdef CONFIG_QFW
+
+#define FW_CONTROL_PORT	0x510
+#define FW_DATA_PORT		0x511
+#define FW_DMA_PORT_LOW	0x514
+#define FW_DMA_PORT_HIGH	0x518
+
+static void qemu_x86_fwcfg_read_entry_pio(uint16_t entry,
+		uint32_t size, void *address)
+{
+	uint32_t i = 0;
+	uint8_t *data = address;
+
+	/*
+	 * writting FW_CFG_INVALID will cause read operation to resume at
+	 * last offset, otherwise read will start at offset 0
+	 */
+	if (entry != FW_CFG_INVALID)
+		outw(entry, FW_CONTROL_PORT);
+	while (size--)
+		data[i++] = inb(FW_DATA_PORT);
+}
+
+static void qemu_x86_fwcfg_read_entry_dma(struct fw_cfg_dma_access *dma)
+{
+	outl(cpu_to_be32((uint32_t)dma), FW_DMA_PORT_HIGH);
+
+	while (be32_to_cpu(dma->control) & ~FW_CFG_DMA_ERROR)
+		__asm__ __volatile__ ("pause");
+}
+
+static struct fw_cfg_arch_ops fwcfg_x86_ops = {
+	.arch_read_pio = qemu_x86_fwcfg_read_entry_pio,
+	.arch_read_dma = qemu_x86_fwcfg_read_entry_dma
+};
+#endif
+
 static void enable_pm_piix(void)
 {
 	u8 en;
@@ -89,7 +126,7 @@ static void qemu_chipset_init(void)
 	}
 
 #ifdef CONFIG_QFW
-	qemu_fwcfg_init();
+	qemu_fwcfg_init(&fwcfg_x86_ops);
 #endif
 }