411 lines
11 KiB
C
411 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Renesas Ethernet SERDES device driver
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*
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* Copyright (C) 2022 Renesas Electronics Corporation
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/iopoll.h>
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#include <linux/kernel.h>
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#include <linux/phy.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#define R8A779F0_ETH_SERDES_NUM 3
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#define R8A779F0_ETH_SERDES_OFFSET 0x0400
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#define R8A779F0_ETH_SERDES_BANK_SELECT 0x03fc
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#define R8A779F0_ETH_SERDES_TIMEOUT_US 100000
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#define R8A779F0_ETH_SERDES_NUM_RETRY_LINKUP 3
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struct r8a779f0_eth_serdes_drv_data;
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struct r8a779f0_eth_serdes_channel {
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struct r8a779f0_eth_serdes_drv_data *dd;
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struct phy *phy;
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void __iomem *addr;
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phy_interface_t phy_interface;
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int speed;
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int index;
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};
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struct r8a779f0_eth_serdes_drv_data {
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void __iomem *addr;
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struct platform_device *pdev;
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struct reset_control *reset;
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struct r8a779f0_eth_serdes_channel channel[R8A779F0_ETH_SERDES_NUM];
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bool initialized;
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};
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/*
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* The datasheet describes initialization procedure without any information
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* about registers' name/bits. So, this is all black magic to initialize
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* the hardware.
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*/
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static void r8a779f0_eth_serdes_write32(void __iomem *addr, u32 offs, u32 bank, u32 data)
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{
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iowrite32(bank, addr + R8A779F0_ETH_SERDES_BANK_SELECT);
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iowrite32(data, addr + offs);
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}
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static int
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r8a779f0_eth_serdes_reg_wait(struct r8a779f0_eth_serdes_channel *channel,
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u32 offs, u32 bank, u32 mask, u32 expected)
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{
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int ret;
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u32 val;
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iowrite32(bank, channel->addr + R8A779F0_ETH_SERDES_BANK_SELECT);
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ret = readl_poll_timeout_atomic(channel->addr + offs, val,
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(val & mask) == expected,
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1, R8A779F0_ETH_SERDES_TIMEOUT_US);
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if (ret)
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dev_dbg(&channel->phy->dev,
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"%s: index %d, offs %x, bank %x, mask %x, expected %x\n",
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__func__, channel->index, offs, bank, mask, expected);
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return ret;
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}
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static int
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r8a779f0_eth_serdes_common_init_ram(struct r8a779f0_eth_serdes_drv_data *dd)
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{
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struct r8a779f0_eth_serdes_channel *channel;
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int i, ret;
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
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channel = &dd->channel[i];
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x026c, 0x180, BIT(0), 0x01);
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if (ret)
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return ret;
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}
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r8a779f0_eth_serdes_write32(dd->addr, 0x026c, 0x180, 0x03);
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return ret;
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}
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static int
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r8a779f0_eth_serdes_common_setting(struct r8a779f0_eth_serdes_channel *channel)
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{
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struct r8a779f0_eth_serdes_drv_data *dd = channel->dd;
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switch (channel->phy_interface) {
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case PHY_INTERFACE_MODE_SGMII:
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r8a779f0_eth_serdes_write32(dd->addr, 0x0244, 0x180, 0x0097);
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r8a779f0_eth_serdes_write32(dd->addr, 0x01d0, 0x180, 0x0060);
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r8a779f0_eth_serdes_write32(dd->addr, 0x01d8, 0x180, 0x2200);
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r8a779f0_eth_serdes_write32(dd->addr, 0x01d4, 0x180, 0x0000);
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r8a779f0_eth_serdes_write32(dd->addr, 0x01e0, 0x180, 0x003d);
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int
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r8a779f0_eth_serdes_chan_setting(struct r8a779f0_eth_serdes_channel *channel)
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{
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int ret;
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switch (channel->phy_interface) {
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case PHY_INTERFACE_MODE_SGMII:
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x380, 0x2000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x01c0, 0x180, 0x0011);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0248, 0x180, 0x0540);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0258, 0x180, 0x0015);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0100);
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r8a779f0_eth_serdes_write32(channel->addr, 0x01a0, 0x180, 0x0000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00d0, 0x180, 0x0002);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0150, 0x180, 0x0003);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00c8, 0x180, 0x0100);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0148, 0x180, 0x0100);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0174, 0x180, 0x0000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0160, 0x180, 0x0007);
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r8a779f0_eth_serdes_write32(channel->addr, 0x01ac, 0x180, 0x0000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00c4, 0x180, 0x0310);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00c8, 0x180, 0x0101);
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x00c8, 0x0180, BIT(0), 0);
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if (ret)
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return ret;
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r8a779f0_eth_serdes_write32(channel->addr, 0x0148, 0x180, 0x0101);
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0148, 0x0180, BIT(0), 0);
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if (ret)
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return ret;
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r8a779f0_eth_serdes_write32(channel->addr, 0x00c4, 0x180, 0x1310);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00d8, 0x180, 0x1800);
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r8a779f0_eth_serdes_write32(channel->addr, 0x00dc, 0x180, 0x0000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x001c, 0x300, 0x0001);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x380, 0x2100);
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0000, 0x0380, BIT(8), 0);
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if (ret)
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return ret;
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if (channel->speed == 1000)
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x0140);
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else if (channel->speed == 100)
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x2100);
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/* For AN_ON */
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r8a779f0_eth_serdes_write32(channel->addr, 0x0004, 0x1f80, 0x0005);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0028, 0x1f80, 0x07a1);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f80, 0x0208);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int
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r8a779f0_eth_serdes_chan_speed(struct r8a779f0_eth_serdes_channel *channel)
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{
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int ret;
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switch (channel->phy_interface) {
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case PHY_INTERFACE_MODE_SGMII:
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/* For AN_ON */
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if (channel->speed == 1000)
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x1140);
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else if (channel->speed == 100)
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r8a779f0_eth_serdes_write32(channel->addr, 0x0000, 0x1f00, 0x3100);
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0008, 0x1f80, BIT(0), 1);
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if (ret)
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return ret;
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r8a779f0_eth_serdes_write32(channel->addr, 0x0008, 0x1f80, 0x0000);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int r8a779f0_eth_serdes_monitor_linkup(struct r8a779f0_eth_serdes_channel *channel)
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{
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int i, ret;
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM_RETRY_LINKUP; i++) {
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ret = r8a779f0_eth_serdes_reg_wait(channel, 0x0004, 0x300,
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BIT(2), BIT(2));
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if (!ret)
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break;
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/* restart */
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r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0100);
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udelay(1);
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r8a779f0_eth_serdes_write32(channel->addr, 0x0144, 0x180, 0x0000);
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}
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return ret;
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}
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static int r8a779f0_eth_serdes_hw_init(struct r8a779f0_eth_serdes_channel *channel)
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{
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struct r8a779f0_eth_serdes_drv_data *dd = channel->dd;
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int i, ret;
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if (dd->initialized)
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return 0;
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ret = r8a779f0_eth_serdes_common_init_ram(dd);
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if (ret)
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return ret;
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
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ret = r8a779f0_eth_serdes_reg_wait(&dd->channel[i], 0x0000,
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0x300, BIT(15), 0);
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if (ret)
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return ret;
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}
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
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r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03d4, 0x380, 0x0443);
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ret = r8a779f0_eth_serdes_common_setting(channel);
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if (ret)
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return ret;
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++)
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r8a779f0_eth_serdes_write32(dd->channel[i].addr, 0x03d0, 0x380, 0x0001);
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r8a779f0_eth_serdes_write32(dd->addr, 0x0000, 0x380, 0x8000);
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ret = r8a779f0_eth_serdes_common_init_ram(dd);
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if (ret)
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return ret;
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return r8a779f0_eth_serdes_reg_wait(&dd->channel[0], 0x0000, 0x380, BIT(15), 0);
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}
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static int r8a779f0_eth_serdes_init(struct phy *p)
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{
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struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
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int ret;
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ret = r8a779f0_eth_serdes_hw_init(channel);
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if (!ret)
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channel->dd->initialized = true;
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return ret;
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}
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static int r8a779f0_eth_serdes_hw_init_late(struct r8a779f0_eth_serdes_channel
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*channel)
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{
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int ret;
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ret = r8a779f0_eth_serdes_chan_setting(channel);
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if (ret)
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return ret;
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ret = r8a779f0_eth_serdes_chan_speed(channel);
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if (ret)
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return ret;
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r8a779f0_eth_serdes_write32(channel->addr, 0x03c0, 0x380, 0x0000);
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r8a779f0_eth_serdes_write32(channel->addr, 0x03d0, 0x380, 0x0000);
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return r8a779f0_eth_serdes_monitor_linkup(channel);
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}
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static int r8a779f0_eth_serdes_power_on(struct phy *p)
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{
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struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
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return r8a779f0_eth_serdes_hw_init_late(channel);
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}
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static int r8a779f0_eth_serdes_set_mode(struct phy *p, enum phy_mode mode,
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int submode)
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{
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struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
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if (mode != PHY_MODE_ETHERNET)
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return -EOPNOTSUPP;
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switch (submode) {
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case PHY_INTERFACE_MODE_GMII:
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case PHY_INTERFACE_MODE_SGMII:
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case PHY_INTERFACE_MODE_USXGMII:
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channel->phy_interface = submode;
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int r8a779f0_eth_serdes_set_speed(struct phy *p, int speed)
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{
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struct r8a779f0_eth_serdes_channel *channel = phy_get_drvdata(p);
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channel->speed = speed;
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return 0;
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}
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static const struct phy_ops r8a779f0_eth_serdes_ops = {
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.init = r8a779f0_eth_serdes_init,
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.power_on = r8a779f0_eth_serdes_power_on,
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.set_mode = r8a779f0_eth_serdes_set_mode,
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.set_speed = r8a779f0_eth_serdes_set_speed,
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};
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static struct phy *r8a779f0_eth_serdes_xlate(struct device *dev,
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struct of_phandle_args *args)
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{
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struct r8a779f0_eth_serdes_drv_data *dd = dev_get_drvdata(dev);
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if (args->args[0] >= R8A779F0_ETH_SERDES_NUM)
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return ERR_PTR(-ENODEV);
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return dd->channel[args->args[0]].phy;
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}
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static const struct of_device_id r8a779f0_eth_serdes_of_table[] = {
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{ .compatible = "renesas,r8a779f0-ether-serdes", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, r8a779f0_eth_serdes_of_table);
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static int r8a779f0_eth_serdes_probe(struct platform_device *pdev)
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{
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struct r8a779f0_eth_serdes_drv_data *dd;
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struct phy_provider *provider;
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struct resource *res;
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int i;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "invalid resource\n");
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return -EINVAL;
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}
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dd = devm_kzalloc(&pdev->dev, sizeof(*dd), GFP_KERNEL);
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if (!dd)
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return -ENOMEM;
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platform_set_drvdata(pdev, dd);
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dd->pdev = pdev;
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dd->addr = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(dd->addr))
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return PTR_ERR(dd->addr);
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dd->reset = devm_reset_control_get(&pdev->dev, NULL);
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if (IS_ERR(dd->reset))
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return PTR_ERR(dd->reset);
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reset_control_reset(dd->reset);
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for (i = 0; i < R8A779F0_ETH_SERDES_NUM; i++) {
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struct r8a779f0_eth_serdes_channel *channel = &dd->channel[i];
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channel->phy = devm_phy_create(&pdev->dev, NULL,
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&r8a779f0_eth_serdes_ops);
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if (IS_ERR(channel->phy))
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return PTR_ERR(channel->phy);
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channel->addr = dd->addr + R8A779F0_ETH_SERDES_OFFSET * i;
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channel->dd = dd;
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channel->index = i;
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phy_set_drvdata(channel->phy, channel);
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}
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provider = devm_of_phy_provider_register(&pdev->dev,
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r8a779f0_eth_serdes_xlate);
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if (IS_ERR(provider))
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return PTR_ERR(provider);
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pm_runtime_enable(&pdev->dev);
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pm_runtime_get_sync(&pdev->dev);
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return 0;
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}
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static void r8a779f0_eth_serdes_remove(struct platform_device *pdev)
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{
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pm_runtime_put(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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platform_set_drvdata(pdev, NULL);
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}
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static struct platform_driver r8a779f0_eth_serdes_driver_platform = {
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.probe = r8a779f0_eth_serdes_probe,
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.remove_new = r8a779f0_eth_serdes_remove,
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.driver = {
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.name = "r8a779f0_eth_serdes",
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.of_match_table = r8a779f0_eth_serdes_of_table,
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}
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};
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module_platform_driver(r8a779f0_eth_serdes_driver_platform);
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MODULE_AUTHOR("Yoshihiro Shimoda");
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MODULE_DESCRIPTION("Renesas Ethernet SERDES device driver");
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MODULE_LICENSE("GPL");
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