[U-Boot] [PATCH 3/3] ahci: provide sunxi SATA driver using AHCI platform framework

Ian Campbell
2014-07-18T19:38:41Z

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>
---
arch/arm/cpu/armv7/sunxi/clock_sun4i.c | 4 ++
arch/arm/include/asm/arch-sunxi/clock_sun4i.h | 11 ++--
board/sunxi/Makefile | 1 +
board/sunxi/ahci.c | 84 +++++++++++++++++++++++++++
boards.cfg | 10 ++--
drivers/block/ahci.c | 16 +++++
include/ahci.h | 4 ++
include/configs/sunxi-common.h | 12 ++++
8 files changed, 133 insertions(+), 9 deletions(-)
create mode 100644 board/sunxi/ahci.c

diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun4i.c b/arch/arm/cpu/armv7/sunxi/clock_sun4i.c
index b8b16cf..ecbdb01 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 928f3f2..2531cbd 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 62acb8f..03f55cc 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 0000000..0c262ea
--- /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/boards.cfg b/boards.cfg
index 035b5c7..f69bd32 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -378,11 +378,11 @@ Active arm armv7 s5pc1xx samsung goni
Active arm armv7 s5pc1xx samsung smdkc100 smdkc100 - Minkyu Kang <mk7.kang@samsung.com>
Active arm armv7 socfpga altera socfpga socfpga_cyclone5 - -
Active arm armv7 sunxi - sunxi A13-OLinuXinoM sun5i:A13_OLINUXINOM,SPL,CONS_INDEX=2 Hans de Goede <hdegoede@redhat.com>
-Active arm armv7 sunxi - sunxi Cubieboard sun4i:CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC Hans de Goede <hdegoede@redhat.com>
-Active arm armv7 sunxi - sunxi Cubieboard2 sun7i:CUBIEBOARD2,SPL,SUNXI_GMAC Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
-Active arm armv7 sunxi - sunxi Cubieboard2_FEL sun7i:CUBIEBOARD2,SPL_FEL,SUNXI_GMAC Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
-Active arm armv7 sunxi - sunxi Cubietruck sun7i:CUBIETRUCK,SPL,AXP209_POWER,SUNXI_GMAC,RGMII Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
-Active arm armv7 sunxi - sunxi Cubietruck_FEL sun7i:CUBIETRUCK,SPL_FEL,AXP209_POWER,SUNXI_GMAC,RGMII Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
+Active arm armv7 sunxi - sunxi Cubieboard sun4i:CUBIEBOARD,SPL,AXP209_POWER,SUNXI_EMAC,AHCI,SATAPWR=SUNXI_GPB(8) Hans de Goede <hdegoede@redhat.com>
+Active arm armv7 sunxi - sunxi Cubieboard2 sun7i:CUBIEBOARD2,SPL,SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPB(8) Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
+Active arm armv7 sunxi - sunxi Cubieboard2_FEL sun7i:CUBIEBOARD2,SPL_FEL,SUNXI_GMAC,AHCI,SATAPWR=SUNXI_GPB(8) Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
+Active arm armv7 sunxi - sunxi Cubietruck sun7i:CUBIETRUCK,SPL,AXP209_POWER,SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPH(12) Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
+Active arm armv7 sunxi - sunxi Cubietruck_FEL sun7i:CUBIETRUCK,SPL_FEL,AXP209_POWER,SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPH(12) Ian Campbell <ijc@hellion.org.uk>:Hans de Goede <hdegoede@redhat.com>
Active arm armv7 sunxi - sunxi r7-tv-dongle sun5i:R7DONGLE,SPL,AXP152_POWER Hans de Goede <hdegoede@redhat.com>
Active arm armv7 u8500 st-ericsson snowball snowball - Mathieu Poirier <mathieu.poirier@linaro.org>
Active arm armv7 u8500 st-ericsson u8500 u8500_href - -
diff --git a/drivers/block/ahci.c b/drivers/block/ahci.c
index 4df8046..dce99ad 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 90e8509..35b8a8c 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 845b004..43eb718 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

--
2.0.1