1 /* 2 * Copyright 2009-2010, 2013 Freescale Semiconductor, Inc. 3 * Jun-jie Zhang <b18070@freescale.com> 4 * Mingkai Hu <Mingkai.hu@freescale.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <miiphy.h> 11 #include <phy.h> 12 #include <fsl_mdio.h> 13 #include <asm/io.h> 14 #include <asm/errno.h> 15 16 void tsec_local_mdio_write(struct tsec_mii_mng __iomem *phyregs, int port_addr, 17 int dev_addr, int regnum, int value) 18 { 19 int timeout = 1000000; 20 21 out_be32(&phyregs->miimadd, (port_addr << 8) | (regnum & 0x1f)); 22 out_be32(&phyregs->miimcon, value); 23 /* Memory barrier */ 24 mb(); 25 26 while ((in_be32(&phyregs->miimind) & MIIMIND_BUSY) && timeout--) 27 ; 28 } 29 30 int tsec_local_mdio_read(struct tsec_mii_mng __iomem *phyregs, int port_addr, 31 int dev_addr, int regnum) 32 { 33 int value; 34 int timeout = 1000000; 35 36 /* Put the address of the phy, and the register number into MIIMADD */ 37 out_be32(&phyregs->miimadd, (port_addr << 8) | (regnum & 0x1f)); 38 39 /* Clear the command register, and wait */ 40 out_be32(&phyregs->miimcom, 0); 41 /* Memory barrier */ 42 mb(); 43 44 /* Initiate a read command, and wait */ 45 out_be32(&phyregs->miimcom, MIIMCOM_READ_CYCLE); 46 /* Memory barrier */ 47 mb(); 48 49 /* Wait for the the indication that the read is done */ 50 while ((in_be32(&phyregs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY)) 51 && timeout--) 52 ; 53 54 /* Grab the value read from the PHY */ 55 value = in_be32(&phyregs->miimstat); 56 57 return value; 58 } 59 60 static int fsl_pq_mdio_reset(struct mii_dev *bus) 61 { 62 struct tsec_mii_mng __iomem *regs = 63 (struct tsec_mii_mng __iomem *)bus->priv; 64 65 /* Reset MII (due to new addresses) */ 66 out_be32(®s->miimcfg, MIIMCFG_RESET_MGMT); 67 68 out_be32(®s->miimcfg, MIIMCFG_INIT_VALUE); 69 70 while (in_be32(®s->miimind) & MIIMIND_BUSY) 71 ; 72 73 return 0; 74 } 75 76 int tsec_phy_read(struct mii_dev *bus, int addr, int dev_addr, int regnum) 77 { 78 struct tsec_mii_mng __iomem *phyregs = 79 (struct tsec_mii_mng __iomem *)bus->priv; 80 81 return tsec_local_mdio_read(phyregs, addr, dev_addr, regnum); 82 } 83 84 int tsec_phy_write(struct mii_dev *bus, int addr, int dev_addr, int regnum, 85 u16 value) 86 { 87 struct tsec_mii_mng __iomem *phyregs = 88 (struct tsec_mii_mng __iomem *)bus->priv; 89 90 tsec_local_mdio_write(phyregs, addr, dev_addr, regnum, value); 91 92 return 0; 93 } 94 95 int fsl_pq_mdio_init(bd_t *bis, struct fsl_pq_mdio_info *info) 96 { 97 struct mii_dev *bus = mdio_alloc(); 98 99 if (!bus) { 100 printf("Failed to allocate FSL MDIO bus\n"); 101 return -1; 102 } 103 104 bus->read = tsec_phy_read; 105 bus->write = tsec_phy_write; 106 bus->reset = fsl_pq_mdio_reset; 107 strcpy(bus->name, info->name); 108 109 bus->priv = (void *)info->regs; 110 111 return mdio_register(bus); 112 } 113