| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2009-2016 Cavium, Inc. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/delay.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/phy.h> |
| 12 | #include <linux/io.h> |
| 13 | |
| 14 | #include "mdio-cavium.h" |
| 15 | |
| 16 | static void cavium_mdiobus_set_mode(struct cavium_mdiobus *p, |
| 17 | enum cavium_mdiobus_mode m) |
| 18 | { |
| 19 | union cvmx_smix_clk smi_clk; |
| 20 | |
| 21 | if (m == p->mode) |
| 22 | return; |
| 23 | |
| 24 | smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK); |
| 25 | smi_clk.s.mode = (m == C45) ? 1 : 0; |
| 26 | smi_clk.s.preamble = 1; |
| 27 | oct_mdio_writeq(smi_clk.u64, p->register_base + SMI_CLK); |
| 28 | p->mode = m; |
| 29 | } |
| 30 | |
| 31 | static int cavium_mdiobus_c45_addr(struct cavium_mdiobus *p, |
| 32 | int phy_id, int regnum) |
| 33 | { |
| 34 | union cvmx_smix_cmd smi_cmd; |
| 35 | union cvmx_smix_wr_dat smi_wr; |
| 36 | int timeout = 1000; |
| 37 | |
| 38 | cavium_mdiobus_set_mode(p, C45); |
| 39 | |
| 40 | smi_wr.u64 = 0; |
| 41 | smi_wr.s.dat = regnum & 0xffff; |
| 42 | oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT); |
| 43 | |
| 44 | regnum = (regnum >> 16) & 0x1f; |
| 45 | |
| 46 | smi_cmd.u64 = 0; |
| 47 | smi_cmd.s.phy_op = 0; /* MDIO_CLAUSE_45_ADDRESS */ |
| 48 | smi_cmd.s.phy_adr = phy_id; |
| 49 | smi_cmd.s.reg_adr = regnum; |
| 50 | oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD); |
| 51 | |
| 52 | do { |
| 53 | /* Wait 1000 clocks so we don't saturate the RSL bus |
| 54 | * doing reads. |
| 55 | */ |
| 56 | __delay(1000); |
| 57 | smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT); |
| 58 | } while (smi_wr.s.pending && --timeout); |
| 59 | |
| 60 | if (timeout <= 0) |
| 61 | return -EIO; |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | int cavium_mdiobus_read(struct mii_bus *bus, int phy_id, int regnum) |
| 66 | { |
| 67 | struct cavium_mdiobus *p = bus->priv; |
| 68 | union cvmx_smix_cmd smi_cmd; |
| 69 | union cvmx_smix_rd_dat smi_rd; |
| 70 | unsigned int op = 1; /* MDIO_CLAUSE_22_READ */ |
| 71 | int timeout = 1000; |
| 72 | |
| 73 | if (regnum & MII_ADDR_C45) { |
| 74 | int r = cavium_mdiobus_c45_addr(p, phy_id, regnum); |
| 75 | |
| 76 | if (r < 0) |
| 77 | return r; |
| 78 | |
| 79 | regnum = (regnum >> 16) & 0x1f; |
| 80 | op = 3; /* MDIO_CLAUSE_45_READ */ |
| 81 | } else { |
| 82 | cavium_mdiobus_set_mode(p, C22); |
| 83 | } |
| 84 | |
| 85 | smi_cmd.u64 = 0; |
| 86 | smi_cmd.s.phy_op = op; |
| 87 | smi_cmd.s.phy_adr = phy_id; |
| 88 | smi_cmd.s.reg_adr = regnum; |
| 89 | oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD); |
| 90 | |
| 91 | do { |
| 92 | /* Wait 1000 clocks so we don't saturate the RSL bus |
| 93 | * doing reads. |
| 94 | */ |
| 95 | __delay(1000); |
| 96 | smi_rd.u64 = oct_mdio_readq(p->register_base + SMI_RD_DAT); |
| 97 | } while (smi_rd.s.pending && --timeout); |
| 98 | |
| 99 | if (smi_rd.s.val) |
| 100 | return smi_rd.s.dat; |
| 101 | else |
| 102 | return -EIO; |
| 103 | } |
| 104 | EXPORT_SYMBOL(cavium_mdiobus_read); |
| 105 | |
| 106 | int cavium_mdiobus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val) |
| 107 | { |
| 108 | struct cavium_mdiobus *p = bus->priv; |
| 109 | union cvmx_smix_cmd smi_cmd; |
| 110 | union cvmx_smix_wr_dat smi_wr; |
| 111 | unsigned int op = 0; /* MDIO_CLAUSE_22_WRITE */ |
| 112 | int timeout = 1000; |
| 113 | |
| 114 | if (regnum & MII_ADDR_C45) { |
| 115 | int r = cavium_mdiobus_c45_addr(p, phy_id, regnum); |
| 116 | |
| 117 | if (r < 0) |
| 118 | return r; |
| 119 | |
| 120 | regnum = (regnum >> 16) & 0x1f; |
| 121 | op = 1; /* MDIO_CLAUSE_45_WRITE */ |
| 122 | } else { |
| 123 | cavium_mdiobus_set_mode(p, C22); |
| 124 | } |
| 125 | |
| 126 | smi_wr.u64 = 0; |
| 127 | smi_wr.s.dat = val; |
| 128 | oct_mdio_writeq(smi_wr.u64, p->register_base + SMI_WR_DAT); |
| 129 | |
| 130 | smi_cmd.u64 = 0; |
| 131 | smi_cmd.s.phy_op = op; |
| 132 | smi_cmd.s.phy_adr = phy_id; |
| 133 | smi_cmd.s.reg_adr = regnum; |
| 134 | oct_mdio_writeq(smi_cmd.u64, p->register_base + SMI_CMD); |
| 135 | |
| 136 | do { |
| 137 | /* Wait 1000 clocks so we don't saturate the RSL bus |
| 138 | * doing reads. |
| 139 | */ |
| 140 | __delay(1000); |
| 141 | smi_wr.u64 = oct_mdio_readq(p->register_base + SMI_WR_DAT); |
| 142 | } while (smi_wr.s.pending && --timeout); |
| 143 | |
| 144 | if (timeout <= 0) |
| 145 | return -EIO; |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | EXPORT_SYMBOL(cavium_mdiobus_write); |
| 150 | |
| 151 | MODULE_DESCRIPTION("Common code for OCTEON and Thunder MDIO bus drivers"); |
| 152 | MODULE_AUTHOR("David Daney"); |
| 153 | MODULE_LICENSE("GPL"); |