ARM: cns3xxx: Add support for AHCI controllers

CNS3xxx chips have AHCI-compatible SATA controller. This patch adds
the support using generic ahci_platform driver.

Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>

3 files changed, 54 insertions, 0 deletions

diff --git a/arch/arm/mach-cns3xxx/cns3420vb.c b/arch/arm/mach-cns3xxx/cns3420vb.c
index 04ae1ced60f0..9df8391fd78a 100644
--- a/arch/arm/mach-cns3xxx/cns3420vb.c
+++ b/arch/arm/mach-cns3xxx/cns3420vb.c
@@ -118,6 +118,7 @@ static void __init cns3420_init(void)
 {
         platform_add_devices(cns3420_pdevs, ARRAY_SIZE(cns3420_pdevs));
 
+        cns3xxx_ahci_init();
         cns3xxx_sdhci_init();
 
         pm_power_off = cns3xxx_power_off;
diff --git a/arch/arm/mach-cns3xxx/devices.c b/arch/arm/mach-cns3xxx/devices.c
index b01a30114622..50b4d31c27c0 100644
--- a/arch/arm/mach-cns3xxx/devices.c
+++ b/arch/arm/mach-cns3xxx/devices.c
@@ -14,6 +14,7 @@
 #include <linux/io.h>
 #include <linux/init.h>
 #include <linux/compiler.h>
+#include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <mach/cns3xxx.h>
 #include <mach/irqs.h>
@@ -21,6 +22,57 @@
 #include "devices.h"
 
 /*
+ * AHCI
+ */
+static struct resource cns3xxx_ahci_resource[] = {
+        [0] = {
+                .start  = CNS3XXX_SATA2_BASE,
+                .end    = CNS3XXX_SATA2_BASE + CNS3XXX_SATA2_SIZE - 1,
+                .flags  = IORESOURCE_MEM,
+        },
+        [1] = {
+                .start  = IRQ_CNS3XXX_SATA,
+                .end    = IRQ_CNS3XXX_SATA,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static u64 cns3xxx_ahci_dmamask = DMA_BIT_MASK(32);
+
+static struct platform_device cns3xxx_ahci_pdev = {
+        .name           = "ahci",
+        .id             = 0,
+        .resource       = cns3xxx_ahci_resource,
+        .num_resources  = ARRAY_SIZE(cns3xxx_ahci_resource),
+        .dev            = {
+                .dma_mask               = &cns3xxx_ahci_dmamask,
+                .coherent_dma_mask      = DMA_BIT_MASK(32),
+        },
+};
+
+void __init cns3xxx_ahci_init(void)
+{
+        u32 tmp;
+
+        tmp = __raw_readl(MISC_SATA_POWER_MODE);
+        tmp |= 0x1 << 16; /* Disable SATA PHY 0 from SLUMBER Mode */
+        tmp |= 0x1 << 17; /* Disable SATA PHY 1 from SLUMBER Mode */
+        __raw_writel(tmp, MISC_SATA_POWER_MODE);
+
+        /* Enable SATA PHY */
+        cns3xxx_pwr_power_up(0x1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_SATA_PHY0);
+        cns3xxx_pwr_power_up(0x1 << PM_PLL_HM_PD_CTRL_REG_OFFSET_SATA_PHY1);
+
+        /* Enable SATA Clock */
+        cns3xxx_pwr_clk_en(0x1 << PM_CLK_GATE_REG_OFFSET_SATA);
+
+        /* De-Asscer SATA Reset */
+        cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SATA));
+
+        platform_device_register(&cns3xxx_ahci_pdev);
+}
+
+/*
  * SDHCI
  */
 static struct resource cns3xxx_sdhci_resources[] = {
diff --git a/arch/arm/mach-cns3xxx/devices.h b/arch/arm/mach-cns3xxx/devices.h
index 0735a45a3aee..27e15a10aa85 100644
--- a/arch/arm/mach-cns3xxx/devices.h
+++ b/arch/arm/mach-cns3xxx/devices.h
@@ -14,6 +14,7 @@
 #ifndef __CNS3XXX_DEVICES_H_
 #define __CNS3XXX_DEVICES_H_
 
+void __init cns3xxx_ahci_init(void);
 void __init cns3xxx_sdhci_init(void);
 
 #endif /* __CNS3XXX_DEVICES_H_ */