arch/mips/netlogic/xlp/ahci-init.c

   1 /*
   2  * Copyright (c) 2003-2014 Broadcom Corporation
   3  * All Rights Reserved
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the Broadcom
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/dma-mapping.h>
  36 #include <linux/kernel.h>
  37 #include <linux/delay.h>
  38 #include <linux/init.h>
  39 #include <linux/pci.h>
  40 #include <linux/irq.h>
  41 #include <linux/bitops.h>
  42
  43 #include <asm/cpu.h>
  44 #include <asm/mipsregs.h>
  45
  46 #include <asm/netlogic/haldefs.h>
  47 #include <asm/netlogic/xlp-hal/xlp.h>
  48 #include <asm/netlogic/common.h>
  49 #include <asm/netlogic/xlp-hal/iomap.h>
  50 #include <asm/netlogic/mips-extns.h>
  51
  52 #define SATA_CTL                0x0
  53 #define SATA_STATUS             0x1     /* Status Reg */
  54 #define SATA_INT                0x2     /* Interrupt Reg */
  55 #define SATA_INT_MASK           0x3     /* Interrupt Mask Reg */
  56 #define SATA_CR_REG_TIMER       0x4     /* PHY Conrol Timer Reg */
  57 #define SATA_CORE_ID            0x5     /* Core ID Reg */
  58 #define SATA_AXI_SLAVE_OPT1     0x6     /* AXI Slave Options Reg */
  59 #define SATA_PHY_LOS_LEV        0x7     /* PHY LOS Level Reg */
  60 #define SATA_PHY_MULTI          0x8     /* PHY Multiplier Reg */
  61 #define SATA_PHY_CLK_SEL        0x9     /* Clock Select Reg */
  62 #define SATA_PHY_AMP1_GEN1      0xa     /* PHY Transmit Amplitude Reg 1 */
  63 #define SATA_PHY_AMP1_GEN2      0xb     /* PHY Transmit Amplitude Reg 2 */
  64 #define SATA_PHY_AMP1_GEN3      0xc     /* PHY Transmit Amplitude Reg 3 */
  65 #define SATA_PHY_PRE1           0xd     /* PHY Transmit Preemphasis Reg 1 */
  66 #define SATA_PHY_PRE2           0xe     /* PHY Transmit Preemphasis Reg 2 */
  67 #define SATA_PHY_PRE3           0xf     /* PHY Transmit Preemphasis Reg 3 */
  68 #define SATA_SPDMODE            0x10    /* Speed Mode Reg */
  69 #define SATA_REFCLK             0x11    /* Reference Clock Control Reg */
  70 #define SATA_BYTE_SWAP_DIS      0x12    /* byte swap disable */
  71
  72 /*SATA_CTL Bits */
  73 #define SATA_RST_N              BIT(0)
  74 #define PHY0_RESET_N            BIT(16)
  75 #define PHY1_RESET_N            BIT(17)
  76 #define PHY2_RESET_N            BIT(18)
  77 #define PHY3_RESET_N            BIT(19)
  78 #define M_CSYSREQ               BIT(2)
  79 #define S_CSYSREQ               BIT(3)
  80
  81 /*SATA_STATUS Bits */
  82 #define P0_PHY_READY            BIT(4)
  83 #define P1_PHY_READY            BIT(5)
  84 #define P2_PHY_READY            BIT(6)
  85 #define P3_PHY_READY            BIT(7)
  86
  87 #define nlm_read_sata_reg(b, r)         nlm_read_reg(b, r)
  88 #define nlm_write_sata_reg(b, r, v)     nlm_write_reg(b, r, v)
  89 #define nlm_get_sata_pcibase(node)      \
  90                 nlm_pcicfg_base(XLP_IO_SATA_OFFSET(node))
  91 /* SATA device specific configuration registers are starts at 0x900 offset */
  92 #define nlm_get_sata_regbase(node)      \
  93                 (nlm_get_sata_pcibase(node) + 0x900)
  94
  95 static void sata_clear_glue_reg(uint64_t regbase, uint32_t off, uint32_t bit)
  96 {
  97         uint32_t reg_val;
  98
  99         reg_val = nlm_read_sata_reg(regbase, off);
 100         nlm_write_sata_reg(regbase, off, (reg_val & ~bit));
 101 }
 102
 103 static void sata_set_glue_reg(uint64_t regbase, uint32_t off, uint32_t bit)
 104 {
 105         uint32_t reg_val;
 106
 107         reg_val = nlm_read_sata_reg(regbase, off);
 108         nlm_write_sata_reg(regbase, off, (reg_val | bit));
 109 }
 110
 111 static void nlm_sata_firmware_init(int node)
 112 {
 113         uint32_t reg_val;
 114         uint64_t regbase;
 115         int i;
 116
 117         pr_info("XLP AHCI Initialization started.\n");
 118         regbase = nlm_get_sata_regbase(node);
 119
 120         /* Reset SATA */
 121         sata_clear_glue_reg(regbase, SATA_CTL, SATA_RST_N);
 122         /* Reset PHY */
 123         sata_clear_glue_reg(regbase, SATA_CTL,
 124                         (PHY3_RESET_N | PHY2_RESET_N
 125                          | PHY1_RESET_N | PHY0_RESET_N));
 126
 127         /* Set SATA */
 128         sata_set_glue_reg(regbase, SATA_CTL, SATA_RST_N);
 129         /* Set PHY */
 130         sata_set_glue_reg(regbase, SATA_CTL,
 131                         (PHY3_RESET_N | PHY2_RESET_N
 132                          | PHY1_RESET_N | PHY0_RESET_N));
 133
 134         pr_debug("Waiting for PHYs to come up.\n");
 135         i = 0;
 136         do {
 137                 reg_val = nlm_read_sata_reg(regbase, SATA_STATUS);
 138                 i++;
 139         } while (((reg_val & 0xF0) != 0xF0) && (i < 10000));
 140
 141         for (i = 0; i < 4; i++) {
 142                 if (reg_val  & (P0_PHY_READY << i))
 143                         pr_info("PHY%d is up.\n", i);
 144                 else
 145                         pr_info("PHY%d is down.\n", i);
 146         }
 147
 148         pr_info("XLP AHCI init done.\n");
 149 }
 150
 151 static int __init nlm_ahci_init(void)
 152 {
 153         int node = 0;
 154         int chip = read_c0_prid() & PRID_IMP_MASK;
 155
 156         if (chip == PRID_IMP_NETLOGIC_XLP3XX)
 157                 nlm_sata_firmware_init(node);
 158         return 0;
 159 }
 160
 161 static void nlm_sata_intr_ack(struct irq_data *data)
 162 {
 163         uint32_t val = 0;
 164         uint64_t regbase;
 165
 166         regbase = nlm_get_sata_regbase(nlm_nodeid());
 167         val = nlm_read_sata_reg(regbase, SATA_INT);
 168         sata_set_glue_reg(regbase, SATA_INT, val);
 169 }
 170
 171 static void nlm_sata_fixup_bar(struct pci_dev *dev)
 172 {
 173         /*
 174          * The AHCI resource is in BAR 0, move it to
 175          * BAR 5, where it is expected
 176          */
 177         dev->resource[5] = dev->resource[0];
 178         memset(&dev->resource[0], 0, sizeof(dev->resource[0]));
 179 }
 180
 181 static void nlm_sata_fixup_final(struct pci_dev *dev)
 182 {
 183         uint32_t val;
 184         uint64_t regbase;
 185         int node = 0; /* XLP3XX does not support multi-node */
 186
 187         regbase = nlm_get_sata_regbase(node);
 188
 189         /* clear pending interrupts and then enable them */
 190         val = nlm_read_sata_reg(regbase, SATA_INT);
 191         sata_set_glue_reg(regbase, SATA_INT, val);
 192
 193         /* Mask the core interrupt. If all the interrupts
 194          * are enabled there are spurious interrupt flow
 195          * happening, to avoid only enable core interrupt
 196          * mask.
 197          */
 198         sata_set_glue_reg(regbase, SATA_INT_MASK, 0x1);
 199
 200         dev->irq = PIC_SATA_IRQ;
 201         nlm_set_pic_extra_ack(node, PIC_SATA_IRQ, nlm_sata_intr_ack);
 202 }
 203
 204 arch_initcall(nlm_ahci_init);
 205
 206 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_NETLOGIC, PCI_DEVICE_ID_NLM_SATA,
 207                 nlm_sata_fixup_bar);
 208 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_NETLOGIC, PCI_DEVICE_ID_NLM_SATA,
 209                 nlm_sata_fixup_final);