x86: broadwell: Add a SATA driver

Add a SATA driver for broadwell. This supports connecting an SSD and the
usual U-Boot commands to read and write data.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 270 insertions, 0 deletions

diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index db60e30..d422a1c 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -8,3 +8,4 @@ obj-y += cpu.o
 obj-y += iobp.o
 obj-y += pch.o
 obj-y += pinctrl_broadwell.o
+obj-y += sata.o
diff --git a/arch/x86/cpu/broadwell/sata.c b/arch/x86/cpu/broadwell/sata.c
new file mode 100644
index 0000000..dfb8486
--- /dev/null
+++ b/arch/x86/cpu/broadwell/sata.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * From coreboot src/soc/intel/broadwell/sata.c
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/intel_regs.h>
+#include <asm/lpc_common.h>
+#include <asm/pch_common.h>
+#include <asm/pch_common.h>
+#include <asm/arch/pch.h>
+
+struct sata_platdata {
+	int port_map;
+	uint port0_gen3_tx;
+	uint port1_gen3_tx;
+	uint port0_gen3_dtle;
+	uint port1_gen3_dtle;
+
+	/*
+	 * SATA DEVSLP Mux
+	 * 0 = port 0 DEVSLP on DEVSLP0/GPIO33
+	 * 1 = port 3 DEVSLP on DEVSLP0/GPIO33
+	 */
+	int devslp_mux;
+
+	/*
+	 * DEVSLP Disable
+	 * 0: DEVSLP is enabled
+	 * 1: DEVSLP is disabled
+	 */
+	int devslp_disable;
+};
+
+static void broadwell_sata_init(struct udevice *dev)
+{
+	struct sata_platdata *plat = dev_get_platdata(dev);
+	u32 reg32;
+	u8 *abar;
+	u16 reg16;
+	int port;
+
+	debug("SATA: Initializing controller in AHCI mode.\n");
+
+	/* Set timings */
+	dm_pci_write_config16(dev, IDE_TIM_PRI, IDE_DECODE_ENABLE);
+	dm_pci_write_config16(dev, IDE_TIM_SEC, IDE_DECODE_ENABLE);
+
+	/* for AHCI, Port Enable is managed in memory mapped space */
+	dm_pci_read_config16(dev, 0x92, &reg16);
+	reg16 &= ~0xf;
+	reg16 |= 0x8000 | plat->port_map;
+	dm_pci_write_config16(dev, 0x92, reg16);
+	udelay(2);
+
+	/* Setup register 98h */
+	dm_pci_read_config32(dev, 0x98, &reg32);
+	reg32 &= ~((1 << 31) | (1 << 30));
+	reg32 |= 1 << 23;
+	reg32 |= 1 << 24; /* Enable MPHY Dynamic Power Gating */
+	dm_pci_write_config32(dev, 0x98, reg32);
+
+	/* Setup register 9Ch */
+	reg16 = 0;           /* Disable alternate ID */
+	reg16 = 1 << 5;      /* BWG step 12 */
+	dm_pci_write_config16(dev, 0x9c, reg16);
+
+	/* SATA Initialization register */
+	reg32 = 0x183;
+	reg32 |= (plat->port_map ^ 0xf) << 24;
+	reg32 |= (plat->devslp_mux & 1) << 15;
+	dm_pci_write_config32(dev, 0x94, reg32);
+
+	/* Initialize AHCI memory-mapped space */
+	dm_pci_read_config32(dev, PCI_BASE_ADDRESS_5, &reg32);
+	abar = (u8 *)reg32;
+	debug("ABAR: %p\n", abar);
+
+	/* CAP (HBA Capabilities) : enable power management */
+	clrsetbits_le32(abar + 0x00, 0x00020060 /* SXS+EMS+PMS */,
+			0x0c006000 /* PSC+SSC+SALP+SSS */ |
+			1 << 18); /* SAM: SATA AHCI MODE ONLY */
+
+	/* PI (Ports implemented) */
+	writel(plat->port_map, abar + 0x0c);
+	(void) readl(abar + 0x0c); /* Read back 1 */
+	(void) readl(abar + 0x0c); /* Read back 2 */
+
+	/* CAP2 (HBA Capabilities Extended)*/
+	if (plat->devslp_disable) {
+		clrbits_le32(abar + 0x24, 1 << 3);
+	} else {
+		/* Enable DEVSLP */
+		setbits_le32(abar + 0x24, 1 << 5 | 1 << 4 | 1 << 3 | 1 << 2);
+
+		for (port = 0; port < 4; port++) {
+			if (!(plat->port_map & (1 << port)))
+				continue;
+			/* DEVSLP DSP */
+			setbits_le32(abar + 0x144 + (0x80 * port), 1 << 1);
+		}
+	}
+
+	/* Static Power Gating for unused ports */
+	reg32 = readl(RCB_REG(0x3a84));
+	/* Port 3 and 2 disabled */
+	if ((plat->port_map & ((1 << 3)|(1 << 2))) == 0)
+		reg32 |= (1 << 24) | (1 << 26);
+	/* Port 1 and 0 disabled */
+	if ((plat->port_map & ((1 << 1)|(1 << 0))) == 0)
+		reg32 |= (1 << 20) | (1 << 18);
+	writel(reg32, RCB_REG(0x3a84));
+
+	/* Set Gen3 Transmitter settings if needed */
+	if (plat->port0_gen3_tx)
+		pch_iobp_update(SATA_IOBP_SP0_SECRT88,
+				~(SATA_SECRT88_VADJ_MASK <<
+				  SATA_SECRT88_VADJ_SHIFT),
+				(plat->port0_gen3_tx &
+				 SATA_SECRT88_VADJ_MASK)
+				<< SATA_SECRT88_VADJ_SHIFT);
+
+	if (plat->port1_gen3_tx)
+		pch_iobp_update(SATA_IOBP_SP1_SECRT88,
+				~(SATA_SECRT88_VADJ_MASK <<
+				  SATA_SECRT88_VADJ_SHIFT),
+				(plat->port1_gen3_tx &
+				 SATA_SECRT88_VADJ_MASK)
+				<< SATA_SECRT88_VADJ_SHIFT);
+
+	/* Set Gen3 DTLE DATA / EDGE registers if needed */
+	if (plat->port0_gen3_dtle) {
+		pch_iobp_update(SATA_IOBP_SP0DTLE_DATA,
+				~(SATA_DTLE_MASK << SATA_DTLE_DATA_SHIFT),
+				(plat->port0_gen3_dtle & SATA_DTLE_MASK)
+				<< SATA_DTLE_DATA_SHIFT);
+
+		pch_iobp_update(SATA_IOBP_SP0DTLE_EDGE,
+				~(SATA_DTLE_MASK << SATA_DTLE_EDGE_SHIFT),
+				(plat->port0_gen3_dtle & SATA_DTLE_MASK)
+				<< SATA_DTLE_EDGE_SHIFT);
+	}
+
+	if (plat->port1_gen3_dtle) {
+		pch_iobp_update(SATA_IOBP_SP1DTLE_DATA,
+				~(SATA_DTLE_MASK << SATA_DTLE_DATA_SHIFT),
+				(plat->port1_gen3_dtle & SATA_DTLE_MASK)
+				<< SATA_DTLE_DATA_SHIFT);
+
+		pch_iobp_update(SATA_IOBP_SP1DTLE_EDGE,
+				~(SATA_DTLE_MASK << SATA_DTLE_EDGE_SHIFT),
+				(plat->port1_gen3_dtle & SATA_DTLE_MASK)
+				<< SATA_DTLE_EDGE_SHIFT);
+	}
+
+	/*
+	 * Additional Programming Requirements for Power Optimizer
+	 */
+
+	/* Step 1 */
+	pch_common_sir_write(dev, 0x64, 0x883c9003);
+
+	/* Step 2: SIR 68h[15:0] = 880Ah */
+	reg32 = pch_common_sir_read(dev, 0x68);
+	reg32 &= 0xffff0000;
+	reg32 |= 0x880a;
+	pch_common_sir_write(dev, 0x68, reg32);
+
+	/* Step 3: SIR 60h[3] = 1 */
+	reg32 = pch_common_sir_read(dev, 0x60);
+	reg32 |= (1 << 3);
+	pch_common_sir_write(dev, 0x60, reg32);
+
+	/* Step 4: SIR 60h[0] = 1 */
+	reg32 = pch_common_sir_read(dev, 0x60);
+	reg32 |= (1 << 0);
+	pch_common_sir_write(dev, 0x60, reg32);
+
+	/* Step 5: SIR 60h[1] = 1 */
+	reg32 = pch_common_sir_read(dev, 0x60);
+	reg32 |= (1 << 1);
+	pch_common_sir_write(dev, 0x60, reg32);
+
+	/* Clock Gating */
+	pch_common_sir_write(dev, 0x70, 0x3f00bf1f);
+	pch_common_sir_write(dev, 0x54, 0xcf000f0f);
+	pch_common_sir_write(dev, 0x58, 0x00190000);
+	clrsetbits_le32(RCB_REG(0x333c), 0x00300000, 0x00c00000);
+
+	dm_pci_read_config32(dev, 0x300, &reg32);
+	reg32 |= 1 << 17 | 1 << 16 | 1 << 19;
+	reg32 |= 1 << 31 | 1 << 30 | 1 << 29;
+	dm_pci_write_config32(dev, 0x300, reg32);
+
+	dm_pci_read_config32(dev, 0x98, &reg32);
+	reg32 |= 1 << 29;
+	dm_pci_write_config32(dev, 0x98, reg32);
+
+	/* Register Lock */
+	dm_pci_read_config32(dev, 0x9c, &reg32);
+	reg32 |= 1 << 31;
+	dm_pci_write_config32(dev, 0x9c, reg32);
+}
+
+static int broadwell_sata_enable(struct udevice *dev)
+{
+	struct sata_platdata *plat = dev_get_platdata(dev);
+	struct gpio_desc desc;
+	u16 map;
+	int ret;
+
+	/*
+	 * Set SATA controller mode early so the resource allocator can
+	 * properly assign IO/Memory resources for the controller.
+	 */
+	map = 0x0060;
+
+	map |= (plat->port_map ^ 0x3f) << 8;
+	dm_pci_write_config16(dev, 0x90, map);
+
+	ret = gpio_request_by_name(dev, "reset-gpio", 0, &desc, GPIOD_IS_OUT);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int broadwell_sata_ofdata_to_platdata(struct udevice *dev)
+{
+	struct sata_platdata *plat = dev_get_platdata(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
+
+	plat->port_map = fdtdec_get_int(blob, node, "intel,sata-port-map", 0);
+	plat->port0_gen3_tx = fdtdec_get_int(blob, node,
+					"intel,sata-port0-gen3-tx", 0);
+
+	return 0;
+}
+
+static int broadwell_sata_probe(struct udevice *dev)
+{
+	if (!(gd->flags & GD_FLG_RELOC))
+		return broadwell_sata_enable(dev);
+	else
+		broadwell_sata_init(dev);
+
+	return 0;
+}
+
+static const struct udevice_id broadwell_ahci_ids[] = {
+	{ .compatible = "intel,wildcatpoint-ahci" },
+	{ }
+};
+
+U_BOOT_DRIVER(ahci_broadwell_drv) = {
+	.name		= "ahci_broadwell",
+	.id		= UCLASS_DISK,
+	.of_match	= broadwell_ahci_ids,
+	.ofdata_to_platdata	= broadwell_sata_ofdata_to_platdata,
+	.probe		= broadwell_sata_probe,
+	.platdata_auto_alloc_size	 = sizeof(struct sata_platdata),
+};