MIPS: Netlogic: Support for XLP3XX on-chip SATA

XLP3XX includes an on-chip SATA controller with 4 ports. The
controller needs glue logic initialization and PCI fixup before
it can be used with the standard AHCI driver.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6872/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 210 insertions, 0 deletions

diff --git a/arch/mips/netlogic/xlp/Makefile b/arch/mips/netlogic/xlp/Makefile
index ed9a93c04650..0cb53af9726c 100644
--- a/arch/mips/netlogic/xlp/Makefile
+++ b/arch/mips/netlogic/xlp/Makefile
@@ -2,3 +2,4 @@ obj-y				+= setup.o nlm_hal.o cop2-ex.o dt.o
 obj-$(CONFIG_SMP)               += wakeup.o
 obj-$(CONFIG_USB)               += usb-init.o
 obj-$(CONFIG_USB)               += usb-init-xlp2.o
+obj-$(CONFIG_SATA_AHCI)         += ahci-init.o
diff --git a/arch/mips/netlogic/xlp/ahci-init.c b/arch/mips/netlogic/xlp/ahci-init.c
new file mode 100644
index 000000000000..a9d0fae02103
--- /dev/null
+++ b/arch/mips/netlogic/xlp/ahci-init.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2003-2014 Broadcom Corporation
+ * All Rights Reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the Broadcom
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/irq.h>
+#include <linux/bitops.h>
+
+#include <asm/cpu.h>
+#include <asm/mipsregs.h>
+
+#include <asm/netlogic/haldefs.h>
+#include <asm/netlogic/xlp-hal/xlp.h>
+#include <asm/netlogic/common.h>
+#include <asm/netlogic/xlp-hal/iomap.h>
+#include <asm/netlogic/mips-extns.h>
+
+#define SATA_CTL                0x0
+#define SATA_STATUS             0x1     /* Status Reg */
+#define SATA_INT                0x2     /* Interrupt Reg */
+#define SATA_INT_MASK           0x3     /* Interrupt Mask Reg */
+#define SATA_CR_REG_TIMER       0x4     /* PHY Conrol Timer Reg */
+#define SATA_CORE_ID            0x5     /* Core ID Reg */
+#define SATA_AXI_SLAVE_OPT1     0x6     /* AXI Slave Options Reg */
+#define SATA_PHY_LOS_LEV        0x7     /* PHY LOS Level Reg */
+#define SATA_PHY_MULTI          0x8     /* PHY Multiplier Reg */
+#define SATA_PHY_CLK_SEL        0x9     /* Clock Select Reg */
+#define SATA_PHY_AMP1_GEN1      0xa     /* PHY Transmit Amplitude Reg 1 */
+#define SATA_PHY_AMP1_GEN2      0xb     /* PHY Transmit Amplitude Reg 2 */
+#define SATA_PHY_AMP1_GEN3      0xc     /* PHY Transmit Amplitude Reg 3 */
+#define SATA_PHY_PRE1           0xd     /* PHY Transmit Preemphasis Reg 1 */
+#define SATA_PHY_PRE2           0xe     /* PHY Transmit Preemphasis Reg 2 */
+#define SATA_PHY_PRE3           0xf     /* PHY Transmit Preemphasis Reg 3 */
+#define SATA_SPDMODE            0x10    /* Speed Mode Reg */
+#define SATA_REFCLK             0x11    /* Reference Clock Control Reg */
+#define SATA_BYTE_SWAP_DIS      0x12    /* byte swap disable */
+
+/*SATA_CTL Bits */
+#define SATA_RST_N              BIT(0)
+#define PHY0_RESET_N            BIT(16)
+#define PHY1_RESET_N            BIT(17)
+#define PHY2_RESET_N            BIT(18)
+#define PHY3_RESET_N            BIT(19)
+#define M_CSYSREQ               BIT(2)
+#define S_CSYSREQ               BIT(3)
+
+/*SATA_STATUS Bits */
+#define P0_PHY_READY            BIT(4)
+#define P1_PHY_READY            BIT(5)
+#define P2_PHY_READY            BIT(6)
+#define P3_PHY_READY            BIT(7)
+
+#define nlm_read_sata_reg(b, r)         nlm_read_reg(b, r)
+#define nlm_write_sata_reg(b, r, v)     nlm_write_reg(b, r, v)
+#define nlm_get_sata_pcibase(node)      \
+                nlm_pcicfg_base(XLP_IO_SATA_OFFSET(node))
+/* SATA device specific configuration registers are starts at 0x900 offset */
+#define nlm_get_sata_regbase(node)      \
+                (nlm_get_sata_pcibase(node) + 0x900)
+
+static void sata_clear_glue_reg(uint64_t regbase, uint32_t off, uint32_t bit)
+{
+        uint32_t reg_val;
+
+        reg_val = nlm_read_sata_reg(regbase, off);
+        nlm_write_sata_reg(regbase, off, (reg_val & ~bit));
+}
+
+static void sata_set_glue_reg(uint64_t regbase, uint32_t off, uint32_t bit)
+{
+        uint32_t reg_val;
+
+        reg_val = nlm_read_sata_reg(regbase, off);
+        nlm_write_sata_reg(regbase, off, (reg_val | bit));
+}
+
+static void nlm_sata_firmware_init(int node)
+{
+        uint32_t reg_val;
+        uint64_t regbase;
+        int i;
+
+        pr_info("XLP AHCI Initialization started.\n");
+        regbase = nlm_get_sata_regbase(node);
+
+        /* Reset SATA */
+        sata_clear_glue_reg(regbase, SATA_CTL, SATA_RST_N);
+        /* Reset PHY */
+        sata_clear_glue_reg(regbase, SATA_CTL,
+                        (PHY3_RESET_N | PHY2_RESET_N
+                         | PHY1_RESET_N | PHY0_RESET_N));
+
+        /* Set SATA */
+        sata_set_glue_reg(regbase, SATA_CTL, SATA_RST_N);
+        /* Set PHY */
+        sata_set_glue_reg(regbase, SATA_CTL,
+                        (PHY3_RESET_N | PHY2_RESET_N
+                         | PHY1_RESET_N | PHY0_RESET_N));
+
+        pr_debug("Waiting for PHYs to come up.\n");
+        i = 0;
+        do {
+                reg_val = nlm_read_sata_reg(regbase, SATA_STATUS);
+                i++;
+        } while (((reg_val & 0xF0) != 0xF0) && (i < 10000));
+
+        for (i = 0; i < 4; i++) {
+                if (reg_val  & (P0_PHY_READY << i))
+                        pr_info("PHY%d is up.\n", i);
+                else
+                        pr_info("PHY%d is down.\n", i);
+        }
+
+        pr_info("XLP AHCI init done.\n");
+}
+
+static int __init nlm_ahci_init(void)
+{
+        int node = 0;
+        int chip = read_c0_prid() & PRID_REV_MASK;
+
+        if (chip == PRID_IMP_NETLOGIC_XLP3XX)
+                nlm_sata_firmware_init(node);
+        return 0;
+}
+
+static void nlm_sata_intr_ack(struct irq_data *data)
+{
+        uint32_t val = 0;
+        uint64_t regbase;
+
+        regbase = nlm_get_sata_regbase(nlm_nodeid());
+        val = nlm_read_sata_reg(regbase, SATA_INT);
+        sata_set_glue_reg(regbase, SATA_INT, val);
+}
+
+static void nlm_sata_fixup_bar(struct pci_dev *dev)
+{
+        /*
+         * The AHCI resource is in BAR 0, move it to
+         * BAR 5, where it is expected
+         */
+        dev->resource[5] = dev->resource[0];
+        memset(&dev->resource[0], 0, sizeof(dev->resource[0]));
+}
+
+static void nlm_sata_fixup_final(struct pci_dev *dev)
+{
+        uint32_t val;
+        uint64_t regbase;
+        int node = 0; /* XLP3XX does not support multi-node */
+
+        regbase = nlm_get_sata_regbase(node);
+
+        /* clear pending interrupts and then enable them */
+        val = nlm_read_sata_reg(regbase, SATA_INT);
+        sata_set_glue_reg(regbase, SATA_INT, val);
+
+        /* Mask the core interrupt. If all the interrupts
+         * are enabled there are spurious interrupt flow
+         * happening, to avoid only enable core interrupt
+         * mask.
+         */
+        sata_set_glue_reg(regbase, SATA_INT_MASK, 0x1);
+
+        dev->irq = PIC_SATA_IRQ;
+        nlm_set_pic_extra_ack(node, PIC_SATA_IRQ, nlm_sata_intr_ack);
+}
+
+arch_initcall(nlm_ahci_init);
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_NETLOGIC, PCI_DEVICE_ID_NLM_SATA,
+                nlm_sata_fixup_bar);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_NETLOGIC, PCI_DEVICE_ID_NLM_SATA,
+                nlm_sata_fixup_final);