ahci: provide sunxi SATA driver using AHCI platform framework

This enables the necessary clocks, in AHB0 and in PLL6_CFG. This is done
for sun7i only since I don't have access to any other sunxi platforms
with sata included.

The PHY setup is derived from the Alwinner releases and Linux, but is mostly
undocumented.

The Allwinner AHCI controller also requires some magic (and, again,
undocumented) DMA initialisation when starting a port.  This is added under a
suitable ifdef.

This option is enabled for Cubieboard, Cubieboard2 and Cubietruck based on
contents of Linux DTS files, including SATA power pin config taken from the
DTS. All build tested, but runtime tested on Cubieboard2 and Cubietruck only.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

12 files changed, 133 insertions, 9 deletions

diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun4i.c b/arch/arm/cpu/armv7/sunxi/clock_sun4i.c
index b8b16cff951..ecbdb0162b2 100644
--- a/arch/arm/cpu/armv7/sunxi/clock_sun4i.c
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun4i.c
@@ -39,6 +39,10 @@ void clock_init_safe(void)
 	setbits_le32(&ccm->ahb_gate0, 0x1 << AHB_GATE_OFFSET_DMA);
 #endif
 	writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
+#ifdef CONFIG_SUNXI_AHCI
+	setbits_le32(&ccm->ahb_gate0, 0x1 << AHB_GATE_OFFSET_SATA);
+	setbits_le32(&ccm->pll6_cfg, 0x1 << CCM_PLL6_CTRL_SATA_EN_SHIFT);
+#endif
 }
 #endif
 
diff --git a/arch/arm/include/asm/arch-sunxi/clock_sun4i.h b/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
index 928f3f26709..2531cbdcd59 100644
--- a/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
+++ b/arch/arm/include/asm/arch-sunxi/clock_sun4i.h
@@ -218,10 +218,13 @@ struct sunxi_ccm_reg {
 #define CCM_PLL5_CTRL_BYPASS (0x1 << 30)
 #define CCM_PLL5_CTRL_EN (0x1 << 31)
 
-#define CCM_PLL6_CTRL_N_SHIFT	8
-#define CCM_PLL6_CTRL_N_MASK	(0x1f << CCM_PLL6_CTRL_N_SHIFT)
-#define CCM_PLL6_CTRL_K_SHIFT	4
-#define CCM_PLL6_CTRL_K_MASK	(0x3 << CCM_PLL6_CTRL_K_SHIFT)
+#define CCM_PLL6_CTRL_EN		31
+#define CCM_PLL6_CTRL_BYPASS_EN		30
+#define CCM_PLL6_CTRL_SATA_EN_SHIFT	14
+#define CCM_PLL6_CTRL_N_SHIFT		8
+#define CCM_PLL6_CTRL_N_MASK		(0x1f << CCM_PLL6_CTRL_N_SHIFT)
+#define CCM_PLL6_CTRL_K_SHIFT		4
+#define CCM_PLL6_CTRL_K_MASK		(0x3 << CCM_PLL6_CTRL_K_SHIFT)
 
 #define CCM_GPS_CTRL_RESET (0x1 << 0)
 #define CCM_GPS_CTRL_GATE (0x1 << 1)
diff --git a/board/sunxi/Makefile b/board/sunxi/Makefile
index 62acb8ff27a..03f55cc49d1 100644
--- a/board/sunxi/Makefile
+++ b/board/sunxi/Makefile
@@ -10,6 +10,7 @@
 #
 obj-y	+= board.o
 obj-$(CONFIG_SUNXI_GMAC)	+= gmac.o
+obj-$(CONFIG_SUNXI_AHCI)	+= ahci.o
 obj-$(CONFIG_A13_OLINUXINOM)	+= dram_a13_oli_micro.o
 obj-$(CONFIG_CUBIEBOARD)	+= dram_cubieboard.o
 obj-$(CONFIG_CUBIEBOARD2)	+= dram_cubieboard2.o
diff --git a/board/sunxi/ahci.c b/board/sunxi/ahci.c
new file mode 100644
index 00000000000..0c262eabb75
--- /dev/null
+++ b/board/sunxi/ahci.c
@@ -0,0 +1,84 @@
+#include <common.h>
+#include <ahci.h>
+#include <scsi.h>
+#include <errno.h>
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#define AHCI_PHYCS0R 0x00c0
+#define AHCI_PHYCS1R 0x00c4
+#define AHCI_PHYCS2R 0x00c8
+#define AHCI_RWCR    0x00fc
+
+/* This magic PHY initialisation was taken from the Allwinner releases
+ * and Linux driver, but is completely undocumented.
+ */
+static int sunxi_ahci_phy_init(u32 base)
+{
+	u8 *reg_base = (u8 *)base;
+	u32 reg_val;
+	int timeout;
+
+	writel(0, reg_base + AHCI_RWCR);
+	mdelay(5);
+
+	setbits_le32(reg_base + AHCI_PHYCS1R, 0x1 << 19);
+	clrsetbits_le32(reg_base + AHCI_PHYCS0R,
+			(0x7 << 24),
+			(0x5 << 24) | (0x1 << 23) | (0x1 << 18));
+	clrsetbits_le32(reg_base + AHCI_PHYCS1R,
+			(0x3 << 16) | (0x1f << 8) | (0x3 << 6),
+			(0x2 << 16) | (0x6 << 8) | (0x2 << 6));
+	setbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 28) | (0x1 << 15));
+	clrbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 19));
+	clrsetbits_le32(reg_base + AHCI_PHYCS0R, (0x7 << 20), (0x3 << 20));
+	clrsetbits_le32(reg_base + AHCI_PHYCS2R, (0x1f << 5), (0x19 << 5));
+	mdelay(5);
+
+	setbits_le32(reg_base + AHCI_PHYCS0R, (0x1 << 19));
+
+	timeout = 250; /* Power up takes approx 50 us */
+	for (;;) {
+		reg_val = readl(reg_base + AHCI_PHYCS0R) & (0x7 << 28);
+		if (reg_val == (0x2 << 28))
+			break;
+		if (--timeout == 0) {
+			printf("AHCI PHY power up failed.\n");
+			return -EIO;
+		}
+		udelay(1);
+	};
+
+	setbits_le32(reg_base + AHCI_PHYCS2R, (0x1 << 24));
+
+	timeout = 100; /* Calibration takes approx 10 us */
+	for (;;) {
+		reg_val = readl(reg_base + AHCI_PHYCS2R) & (0x1 << 24);
+		if (reg_val == 0x0)
+			break;
+		if (--timeout == 0) {
+			printf("AHCI PHY calibration failed.\n");
+			return -EIO;
+		}
+		udelay(1);
+	}
+
+	mdelay(15);
+
+	writel(0x7, reg_base + AHCI_RWCR);
+
+	return 0;
+}
+
+void scsi_init(void)
+{
+	printf("SUNXI SCSI INIT\n");
+#ifdef CONFIG_SATAPWR
+	gpio_direction_output(CONFIG_SATAPWR, 1);
+#endif
+
+	if (sunxi_ahci_phy_init(SUNXI_SATA_BASE) < 0)
+		return;
+
+	ahci_init(SUNXI_SATA_BASE);
+}
diff --git a/configs/Cubieboard2_FEL_defconfig b/configs/Cubieboard2_FEL_defconfig
index 08f31591c2a..4eddd089691 100644
--- a/configs/Cubieboard2_FEL_defconfig
+++ b/configs/Cubieboard2_FEL_defconfig
@@ -1,4 +1,4 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD2,SPL_FEL,SUNXI_GMAC"
+CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD2,SPL_FEL,SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPB(8)"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SUN7I=y
diff --git a/configs/Cubieboard2_defconfig b/configs/Cubieboard2_defconfig
index 122dac94fb4..ce06fe9ab13 100644
--- a/configs/Cubieboard2_defconfig
+++ b/configs/Cubieboard2_defconfig
@@ -1,4 +1,4 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD2,SPL,SUNXI_GMAC"
+CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD2,SPL,SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPB(8)"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SUN7I=y
diff --git a/configs/Cubieboard_defconfig b/configs/Cubieboard_defconfig
index 29bf8361e1b..7646ea4a37a 100644
--- a/configs/Cubieboard_defconfig
+++ b/configs/Cubieboard_defconfig
@@ -1,4 +1,4 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC"
+CONFIG_SYS_EXTRA_OPTIONS="CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC,AHCI,SATAPWR=SUNXI_GPB(8)"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SUN4I=y
diff --git a/configs/Cubietruck_FEL_defconfig b/configs/Cubietruck_FEL_defconfig
index b95c5fab28b..73867f725fa 100644
--- a/configs/Cubietruck_FEL_defconfig
+++ b/configs/Cubietruck_FEL_defconfig
@@ -1,4 +1,4 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="CUBIETRUCK,SPL_FEL,AXP209_POWER,SUNXI_GMAC,RGMII"
+CONFIG_SYS_EXTRA_OPTIONS="CUBIETRUCK,SPL_FEL,AXP209_POWER,SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPH(12)"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SUN7I=y
diff --git a/configs/Cubietruck_defconfig b/configs/Cubietruck_defconfig
index 4c1e9a3987b..eb460ac9b1b 100644
--- a/configs/Cubietruck_defconfig
+++ b/configs/Cubietruck_defconfig
@@ -1,4 +1,4 @@
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="CUBIETRUCK,SPL,AXP209_POWER,SUNXI_GMAC,RGMII"
+CONFIG_SYS_EXTRA_OPTIONS="CUBIETRUCK,SPL,AXP209_POWER,SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPH(12)"
 +S:CONFIG_ARM=y
 +S:CONFIG_TARGET_SUN7I=y
diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index 4df804671a8..dce99adc6b5 100644
--- a/drivers/block/ahci.c
+++ b/drivers/block/ahci.c
@@ -129,6 +129,14 @@ int __weak ahci_link_up(struct ahci_probe_ent *probe_ent, u8 port)
 	return 1;
 }
 
+#ifdef CONFIG_SUNXI_AHCI
+/* The sunxi AHCI controller requires this undocumented setup */
+static void sunxi_dma_init(volatile u8 *port_mmio)
+{
+	clrsetbits_le32(port_mmio + PORT_P0DMACR, 0x0000ff00, 0x00004400);
+}
+#endif
+
 static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 {
 #ifndef CONFIG_SCSI_AHCI_PLAT
@@ -213,6 +221,10 @@ static int ahci_host_init(struct ahci_probe_ent *probe_ent)
 			msleep(500);
 		}
 
+#ifdef CONFIG_SUNXI_AHCI
+		sunxi_dma_init(port_mmio);
+#endif
+
 		/* Add the spinup command to whatever mode bits may
 		 * already be on in the command register.
 		 */
@@ -545,6 +557,10 @@ static int ahci_port_start(u8 port)
 
 	writel_with_flush(pp->rx_fis, port_mmio + PORT_FIS_ADDR);
 
+#ifdef CONFIG_SUNXI_AHCI
+	sunxi_dma_init(port_mmio);
+#endif
+
 	writel_with_flush(PORT_CMD_ICC_ACTIVE | PORT_CMD_FIS_RX |
 			  PORT_CMD_POWER_ON | PORT_CMD_SPIN_UP |
 			  PORT_CMD_START, port_mmio + PORT_CMD);
diff --git a/include/ahci.h b/include/ahci.h
index 90e850929b7..35b8a8c09b1 100644
--- a/include/ahci.h
+++ b/include/ahci.h
@@ -58,6 +58,10 @@
 #define PORT_SCR_ERR		0x30 /* SATA phy register: SError */
 #define PORT_SCR_ACT		0x34 /* SATA phy register: SActive */
 
+#ifdef CONFIG_SUNXI_AHCI
+#define PORT_P0DMACR		0x70 /* SUNXI specific "DMA register" */
+#endif
+
 /* PORT_IRQ_{STAT,MASK} bits */
 #define PORT_IRQ_COLD_PRES	(1 << 31) /* cold presence detect */
 #define PORT_IRQ_TF_ERR		(1 << 30) /* task file error */
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 8ab6429e482..1505510cda8 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -57,6 +57,18 @@
 #define PHYS_SDRAM_0			CONFIG_SYS_SDRAM_BASE
 #define PHYS_SDRAM_0_SIZE		0x80000000 /* 2 GiB */
 
+#ifdef CONFIG_AHCI
+#define CONFIG_LIBATA
+#define CONFIG_SCSI_AHCI
+#define CONFIG_SCSI_AHCI_PLAT
+#define CONFIG_SUNXI_AHCI
+#define CONFIG_SYS_SCSI_MAX_SCSI_ID	1
+#define CONFIG_SYS_SCSI_MAX_LUN		1
+#define CONFIG_SYS_SCSI_MAX_DEVICE	(CONFIG_SYS_SCSI_MAX_SCSI_ID * \
+					 CONFIG_SYS_SCSI_MAX_LUN)
+#define CONFIG_CMD_SCSI
+#endif
+
 #define CONFIG_CMD_MEMORY
 #define CONFIG_CMD_SETEXPR