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/*
* Cisco Meraki MR18 board support
*
* Copyright (C) 2015 Chris Blake <chrisrblake93@gmail.com>
* Copyright (C) 2015 Christian Lamparter <chunkeey@googlemail.com>
* Copyright (C) 2015 Thomas Hebb <tommyhebb@gmail.com>
*
* Based on Cisco Meraki GPL Release r23-20150601 MR18 Device Config
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <linux/ath9k_platform.h>
#include <linux/platform/ar934x_nfc.h>
#include <linux/platform_data/phy-at803x.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include <linux/leds-nu801.h>
#include <linux/pci.h>
#include "common.h"
#include "dev-eth.h"
#include "pci.h"
#include "dev-gpio-buttons.h"
#include "dev-leds-gpio.h"
#include "dev-nfc.h"
#include "dev-wmac.h"
#include "machtypes.h"
#define MR18_GPIO_LED_POWER_WHITE 18
#define MR18_GPIO_LED_POWER_ORANGE 21
#define MR18_GPIO_BTN_RESET 17
#define MR18_KEYS_POLL_INTERVAL 20 /* msecs */
#define MR18_KEYS_DEBOUNCE_INTERVAL (3 * MR18_KEYS_POLL_INTERVAL)
#define MR18_WAN_PHYADDR 3
/* used for eth calibration */
#define MR18_OTP_BASE (AR71XX_APB_BASE + 0x130000)
#define MR18_OTP_SIZE (0x2000) /* just a guess */
#define MR18_OTP_MEM_0_REG (0x0000)
#define MR18_OTP_INTF2_REG (0x1008)
#define MR18_OTP_STATUS0_REG (0x1018)
#define MR18_OTP_STATUS0_EFUSE_VALID BIT(2)
#define MR18_OTP_STATUS1_REG (0x101c)
#define MR18_OTP_LDO_CTRL_REG (0x1024)
#define MR18_OTP_LDO_STATUS_REG (0x102c)
#define MR18_OTP_LDO_STATUS_POWER_ON BIT(0)
static struct gpio_led MR18_leds_gpio[] __initdata = {
{
.name = "mr18:white:power",
.gpio = MR18_GPIO_LED_POWER_WHITE,
.active_low = 1,
}, {
.name = "mr18:orange:power",
.gpio = MR18_GPIO_LED_POWER_ORANGE,
.active_low = 0,
},
};
static struct gpio_keys_button MR18_gpio_keys[] __initdata = {
{
.desc = "reset",
.type = EV_KEY,
.code = KEY_RESTART,
.debounce_interval = MR18_KEYS_DEBOUNCE_INTERVAL,
.gpio = MR18_GPIO_BTN_RESET,
.active_low = 1,
},
};
static struct led_nu801_template tricolor_led_template = {
.device_name = "mr18",
.name = "tricolor",
.num_leds = 1,
.cki = 11,
.sdi = 12,
.lei = -1,
.ndelay = 500,
.init_brightness = {
LED_OFF,
LED_OFF,
LED_OFF,
},
.default_trigger = "none",
.led_colors = { "red", "green", "blue" },
};
static struct led_nu801_platform_data tricolor_led_data = {
.num_controllers = 1,
.template = &tricolor_led_template,
};
static struct platform_device tricolor_leds = {
.name = "leds-nu801",
.id = -1,
.dev.platform_data = &tricolor_led_data,
};
static int mr18_extract_sgmii_res_cal(void)
{
void __iomem *base;
unsigned int reversed_sgmii_value;
unsigned int otp_value, otp_per_val, rbias_per, read_data;
unsigned int rbias_pos_or_neg;
unsigned int sgmii_res_cal_value;
int res_cal_val;
base = ioremap_nocache(MR18_OTP_BASE, MR18_OTP_SIZE);
if (!base)
return -EIO;
__raw_writel(0x7d, base + MR18_OTP_INTF2_REG);
__raw_writel(0x00, base + MR18_OTP_LDO_CTRL_REG);
while (__raw_readl(base + MR18_OTP_LDO_STATUS_REG) &
MR18_OTP_LDO_STATUS_POWER_ON);
__raw_readl(base + MR18_OTP_MEM_0_REG + 4);
while (!(__raw_readl(base + MR18_OTP_STATUS0_REG) &
MR18_OTP_STATUS0_EFUSE_VALID));
read_data = __raw_readl(base + MR18_OTP_STATUS1_REG);
iounmap(base);
if (!(read_data & 0x1fff))
return -ENODEV;
if (read_data & 0x00001000)
otp_value = (read_data & 0xfc0) >> 6;
else
otp_value = read_data & 0x3f;
if (otp_value > 31) {
otp_per_val = 63 - otp_value;
rbias_pos_or_neg = 1;
} else {
otp_per_val = otp_value;
rbias_pos_or_neg = 0;
}
rbias_per = otp_per_val * 15;
if (rbias_pos_or_neg == 1)
res_cal_val = (rbias_per + 34) / 21;
else if (rbias_per > 34)
res_cal_val = -((rbias_per - 34) / 21);
else
res_cal_val = (34 - rbias_per) / 21;
sgmii_res_cal_value = (8 + res_cal_val) & 0xf;
reversed_sgmii_value = (sgmii_res_cal_value & 8) >> 3;
reversed_sgmii_value |= (sgmii_res_cal_value & 4) >> 1;
reversed_sgmii_value |= (sgmii_res_cal_value & 2) << 1;
reversed_sgmii_value |= (sgmii_res_cal_value & 1) << 3;
printk(KERN_INFO "SGMII cal value = 0x%x\n", reversed_sgmii_value);
return reversed_sgmii_value;
}
static void mr18_setup_qca955x_eth_serdes_cal(unsigned int sgmii_value)
{
void __iomem *ethbase, *pllbase;
u32 t;
ethbase = ioremap_nocache(QCA955X_GMAC_BASE, QCA955X_GMAC_SIZE);
pllbase = ioremap_nocache(AR71XX_PLL_BASE, AR71XX_PLL_SIZE);
/* To Check the locking of the SGMII PLL */
t = __raw_readl(ethbase + QCA955X_GMAC_REG_SGMII_SERDES);
t &= ~(QCA955X_SGMII_SERDES_RES_CALIBRATION_MASK <<
QCA955X_SGMII_SERDES_RES_CALIBRATION_SHIFT);
t |= (sgmii_value & QCA955X_SGMII_SERDES_RES_CALIBRATION_MASK) <<
QCA955X_SGMII_SERDES_RES_CALIBRATION_SHIFT;
__raw_writel(t, ethbase + QCA955X_GMAC_REG_SGMII_SERDES);
__raw_writel(QCA955X_PLL_ETH_SGMII_SERDES_LOCK_DETECT |
QCA955X_PLL_ETH_SGMII_SERDES_PLL_REFCLK |
QCA955X_PLL_ETH_SGMII_SERDES_EN_PLL,
pllbase + QCA955X_PLL_ETH_SGMII_SERDES_REG);
ath79_device_reset_clear(QCA955X_RESET_SGMII_ANALOG);
ath79_device_reset_clear(QCA955X_RESET_SGMII);
while (!(__raw_readl(ethbase + QCA955X_GMAC_REG_SGMII_SERDES) &
QCA955X_SGMII_SERDES_LOCK_DETECT_STATUS));
iounmap(ethbase);
iounmap(pllbase);
}
static struct ath9k_platform_data pci_main_wifi_data = {
.led_pin = -1,
};
static struct ath9k_platform_data pci_scan_wifi_data = {
.led_pin = -1,
};
static int mr18_dual_pci_plat_dev_init(struct pci_dev *dev)
{
/* The PCIE devices are attached to different busses but they
* both share the same slot number. Checking the PCI_SLOT vals
* does not work.
*/
switch (dev->bus->number) {
case 0:
dev->dev.platform_data = &pci_main_wifi_data;
break;
case 1:
dev->dev.platform_data = &pci_scan_wifi_data;
break;
}
return 0;
}
static void __init mr18_setup(void)
{
int res;
/* NAND */
ath79_nfc_set_ecc_mode(AR934X_NFC_ECC_SOFT_BCH);
ath79_register_nfc();
/* even though, the PHY is connected via RGMII,
* the SGMII/SERDES PLLs need to be calibrated and locked.
* Or else, the PHY won't be working for this platfrom.
*
* Figuring this out took such a long time, that we want to
* point this quirk out, before someone wants to remove it.
*/
res = mr18_extract_sgmii_res_cal();
if (res >= 0) {
/* Setup SoC Eth Config */
ath79_setup_qca955x_eth_cfg(QCA955X_ETH_CFG_RGMII_EN |
(3 << QCA955X_ETH_CFG_RXD_DELAY_SHIFT) |
(3 << QCA955X_ETH_CFG_RDV_DELAY_SHIFT));
/* MDIO Interface */
ath79_register_mdio(0, 0x0);
mr18_setup_qca955x_eth_serdes_cal(res);
/* GMAC0 is connected to an Atheros AR8035-A */
ath79_init_mac(ath79_eth0_data.mac_addr, NULL, 0);
ath79_eth0_data.mii_bus_dev = &ath79_mdio0_device.dev;
ath79_eth0_data.phy_if_mode = PHY_INTERFACE_MODE_RGMII;
ath79_eth0_data.phy_mask = BIT(MR18_WAN_PHYADDR);
ath79_eth0_pll_data.pll_1000 = 0xa6000000;
ath79_eth0_pll_data.pll_100 = 0xa0000101;
ath79_eth0_pll_data.pll_10 = 0x80001313;
ath79_register_eth(0);
} else {
printk(KERN_ERR "failed to read EFUSE for ethernet cal\n");
}
/* LEDs and Buttons */
platform_device_register(&tricolor_leds);
ath79_register_leds_gpio(-1, ARRAY_SIZE(MR18_leds_gpio),
MR18_leds_gpio);
ath79_register_gpio_keys_polled(-1, MR18_KEYS_POLL_INTERVAL,
ARRAY_SIZE(MR18_gpio_keys),
MR18_gpio_keys);
/* Clear RTC reset (Needed by SoC WiFi) */
ath79_device_reset_clear(QCA955X_RESET_RTC);
/* WiFi */
ath79_register_wmac_simple();
pci_main_wifi_data.eeprom_name = "pci_wmac0.eeprom";
pci_scan_wifi_data.eeprom_name = "pci_wmac1.eeprom";
ath79_pci_set_plat_dev_init(mr18_dual_pci_plat_dev_init);
ath79_register_pci();
}
MIPS_MACHINE(ATH79_MACH_MR18, "MR18", "Meraki MR18", mr18_setup);
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