freebsd-skq/sys/mips/atheros/ar934x_chip.c
adrian e44e1c10f7 Reshuffle all of the DDR flush operations into a single switch/mux,
and start teaching subsystems about it.

The Atheros MIPS platforms don't guarantee any kind of FIFO consistency
with interrupts in hardware.  So software needs to do a flush when it
receives an interrupt and before it calls the interrupt handler.

There are new ones for the QCA934x and QCA955x, so do a few things:

* Get rid of the individual ones (for ethernet and IP2);
* Create a mux and enum listing all the variations on DDR flushes;
* replace the uses of IP2 with the relevant one (which will typically
  be "PCI" here);
* call the USB DDR flush before calling the real USB interrupt handlers;
* call the ethernet one upon receiving an interrupt that's for us,
  rather than never calling it during operation.

Tested:

* QCA9558 (TP-Link archer c7 v2)
* AR9331 (Carambola 2)

TODO:

* PCI, USB, ethernet, etc need to do a double-check to see if the
  interrupt was truely for them before doing the DDR.  For now I
  prefer "correct" over "fast".
2015-07-04 03:05:57 +00:00

471 lines
12 KiB
C

/*-
* Copyright (c) 2013 Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/cons.h>
#include <sys/kdb.h>
#include <sys/reboot.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <net/ethernet.h>
#include <machine/clock.h>
#include <machine/cpu.h>
#include <machine/cpuregs.h>
#include <machine/hwfunc.h>
#include <machine/md_var.h>
#include <machine/trap.h>
#include <machine/vmparam.h>
#include <mips/atheros/ar71xxreg.h>
#include <mips/atheros/ar934xreg.h>
#include <mips/atheros/ar71xx_cpudef.h>
#include <mips/atheros/ar71xx_setup.h>
#include <mips/atheros/ar71xx_chip.h>
#include <mips/atheros/ar934x_chip.h>
static void
ar934x_chip_detect_mem_size(void)
{
}
static uint32_t
ar934x_get_pll_freq(uint32_t ref, uint32_t ref_div, uint32_t nint,
uint32_t nfrac, uint32_t frac, uint32_t out_div)
{
uint64_t t;
uint32_t ret;
t = u_ar71xx_refclk;
t *= nint;
t = t / ref_div;
ret = t;
t = u_ar71xx_refclk;
t *= nfrac;
t = t / (ref_div * frac);
ret += t;
ret /= (1 << out_div);
return (ret);
}
static void
ar934x_chip_detect_sys_frequency(void)
{
uint32_t pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv;
uint32_t cpu_pll, ddr_pll;
uint32_t bootstrap;
uint32_t reg;
bootstrap = ATH_READ_REG(AR934X_RESET_REG_BOOTSTRAP);
if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
u_ar71xx_refclk = 40 * 1000 * 1000;
else
u_ar71xx_refclk = 25 * 1000 * 1000;
pll = ATH_READ_REG(AR934X_SRIF_CPU_DPLL2_REG);
if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
AR934X_SRIF_DPLL2_OUTDIV_MASK;
pll = ATH_READ_REG(AR934X_SRIF_CPU_DPLL1_REG);
nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
AR934X_SRIF_DPLL1_NINT_MASK;
nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
AR934X_SRIF_DPLL1_REFDIV_MASK;
frac = 1 << 18;
} else {
pll = ATH_READ_REG(AR934X_PLL_CPU_CONFIG_REG);
out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
AR934X_PLL_CPU_CONFIG_NINT_MASK;
nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
frac = 1 << 6;
}
cpu_pll = ar934x_get_pll_freq(u_ar71xx_refclk, ref_div, nint,
nfrac, frac, out_div);
pll = ATH_READ_REG(AR934X_SRIF_DDR_DPLL2_REG);
if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
AR934X_SRIF_DPLL2_OUTDIV_MASK;
pll = ATH_READ_REG(AR934X_SRIF_DDR_DPLL1_REG);
nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
AR934X_SRIF_DPLL1_NINT_MASK;
nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
AR934X_SRIF_DPLL1_REFDIV_MASK;
frac = 1 << 18;
} else {
pll = ATH_READ_REG(AR934X_PLL_DDR_CONFIG_REG);
out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
AR934X_PLL_DDR_CONFIG_NINT_MASK;
nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
frac = 1 << 10;
}
ddr_pll = ar934x_get_pll_freq(u_ar71xx_refclk, ref_div, nint,
nfrac, frac, out_div);
clk_ctrl = ATH_READ_REG(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS)
u_ar71xx_cpu_freq = u_ar71xx_refclk;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
u_ar71xx_cpu_freq = cpu_pll / (postdiv + 1);
else
u_ar71xx_cpu_freq = ddr_pll / (postdiv + 1);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS)
u_ar71xx_ddr_freq = u_ar71xx_refclk;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
u_ar71xx_ddr_freq = ddr_pll / (postdiv + 1);
else
u_ar71xx_ddr_freq = cpu_pll / (postdiv + 1);
postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) &
AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK;
if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS)
u_ar71xx_ahb_freq = u_ar71xx_refclk;
else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
u_ar71xx_ahb_freq = ddr_pll / (postdiv + 1);
else
u_ar71xx_ahb_freq = cpu_pll / (postdiv + 1);
u_ar71xx_wdt_freq = u_ar71xx_refclk;
u_ar71xx_uart_freq = u_ar71xx_refclk;
/*
* Next, fetch reference clock speed for MDIO bus.
*/
reg = ATH_READ_REG(AR934X_PLL_SWITCH_CLOCK_CONTROL_REG);
if (reg & AR934X_PLL_SWITCH_CLOCK_CONTROL_MDIO_CLK_SEL) {
printf("%s: mdio=100MHz\n", __func__);
u_ar71xx_mdio_freq = (100 * 1000 * 1000);
} else {
printf("%s: mdio=%d Hz\n", __func__, u_ar71xx_refclk);
u_ar71xx_mdio_freq = u_ar71xx_refclk;
}
}
static void
ar934x_chip_device_stop(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR934X_RESET_REG_RESET_MODULE);
ATH_WRITE_REG(AR934X_RESET_REG_RESET_MODULE, reg | mask);
}
static void
ar934x_chip_device_start(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR934X_RESET_REG_RESET_MODULE);
ATH_WRITE_REG(AR934X_RESET_REG_RESET_MODULE, reg & ~mask);
}
static int
ar934x_chip_device_stopped(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR934X_RESET_REG_RESET_MODULE);
return ((reg & mask) == mask);
}
static void
ar934x_chip_set_mii_speed(uint32_t unit, uint32_t speed)
{
/* XXX TODO */
return;
}
/*
* XXX TODO !!
*/
static void
ar934x_chip_set_pll_ge(int unit, int speed, uint32_t pll)
{
switch (unit) {
case 0:
ATH_WRITE_REG(AR934X_PLL_ETH_XMII_CONTROL_REG, pll);
break;
case 1:
/* XXX nothing */
break;
default:
printf("%s: invalid PLL set for arge unit: %d\n",
__func__, unit);
return;
}
}
static void
ar934x_chip_ddr_flush(ar71xx_flush_ddr_id_t id)
{
switch (id) {
case AR71XX_CPU_DDR_FLUSH_GE0:
ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_GE0);
break;
case AR71XX_CPU_DDR_FLUSH_GE1:
ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_GE1);
break;
case AR71XX_CPU_DDR_FLUSH_USB:
ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_USB);
break;
case AR71XX_CPU_DDR_FLUSH_PCIE:
ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_PCIE);
break;
case AR71XX_CPU_DDR_FLUSH_WMAC:
ar71xx_ddr_flush(AR934X_DDR_REG_FLUSH_WMAC);
break;
default:
printf("%s: invalid DDR flush id (%d)\n", __func__, id);
break;
}
}
static uint32_t
ar934x_chip_get_eth_pll(unsigned int mac, int speed)
{
uint32_t pll;
switch (speed) {
case 10:
pll = AR934X_PLL_VAL_10;
break;
case 100:
pll = AR934X_PLL_VAL_100;
break;
case 1000:
pll = AR934X_PLL_VAL_1000;
break;
default:
printf("%s%d: invalid speed %d\n", __func__, mac, speed);
pll = 0;
}
return (pll);
}
static void
ar934x_chip_reset_ethernet_switch(void)
{
ar71xx_device_stop(AR934X_RESET_ETH_SWITCH);
DELAY(100);
ar71xx_device_start(AR934X_RESET_ETH_SWITCH);
DELAY(100);
}
static void
ar934x_configure_gmac(uint32_t gmac_cfg)
{
uint32_t reg;
reg = ATH_READ_REG(AR934X_GMAC_REG_ETH_CFG);
printf("%s: ETH_CFG=0x%08x\n", __func__, reg);
reg &= ~(AR934X_ETH_CFG_RGMII_GMAC0 | AR934X_ETH_CFG_MII_GMAC0 |
AR934X_ETH_CFG_MII_GMAC0 | AR934X_ETH_CFG_SW_ONLY_MODE |
AR934X_ETH_CFG_SW_PHY_SWAP);
reg |= gmac_cfg;
ATH_WRITE_REG(AR934X_GMAC_REG_ETH_CFG, reg);
}
static void
ar934x_chip_init_usb_peripheral(void)
{
uint32_t reg;
reg = ATH_READ_REG(AR934X_RESET_REG_BOOTSTRAP);
if (reg & AR934X_BOOTSTRAP_USB_MODE_DEVICE)
return;
ar71xx_device_stop(AR934X_RESET_USBSUS_OVERRIDE);
DELAY(100);
ar71xx_device_start(AR934X_RESET_USB_PHY);
DELAY(100);
ar71xx_device_start(AR934X_RESET_USB_PHY_ANALOG);
DELAY(100);
ar71xx_device_start(AR934X_RESET_USB_HOST);
DELAY(100);
}
static void
ar934x_chip_set_mii_if(uint32_t unit, uint32_t mii_mode)
{
/*
* XXX !
*
* Nothing to see here; although gmac0 can have its
* MII configuration changed, the register values
* are slightly different.
*/
}
/*
* XXX TODO: fetch default MII divider configuration
*/
static void
ar934x_chip_reset_wmac(void)
{
/* XXX TODO */
}
static void
ar934x_chip_init_gmac(void)
{
long gmac_cfg;
if (resource_long_value("ar934x_gmac", 0, "gmac_cfg",
&gmac_cfg) == 0) {
printf("%s: gmac_cfg=0x%08lx\n",
__func__,
(long) gmac_cfg);
ar934x_configure_gmac((uint32_t) gmac_cfg);
}
}
/*
* Reset the NAND Flash Controller.
*
* + active=1 means "make it active".
* + active=0 means "make it inactive".
*/
static void
ar934x_chip_reset_nfc(int active)
{
if (active) {
ar71xx_device_start(AR934X_RESET_NANDF);
DELAY(100);
ar71xx_device_start(AR934X_RESET_ETH_SWITCH_ANALOG);
DELAY(250);
} else {
ar71xx_device_stop(AR934X_RESET_ETH_SWITCH_ANALOG);
DELAY(250);
ar71xx_device_stop(AR934X_RESET_NANDF);
DELAY(100);
}
}
/*
* Configure the GPIO output mux setup.
*
* The AR934x introduced an output mux which allowed
* certain functions to be configured on any pin.
* Specifically, the switch PHY link LEDs and
* WMAC external RX LNA switches are not limited to
* a specific GPIO pin.
*/
static void
ar934x_chip_gpio_output_configure(int gpio, uint8_t func)
{
uint32_t reg, s;
uint32_t t;
if (gpio > AR934X_GPIO_COUNT)
return;
reg = AR934X_GPIO_REG_OUT_FUNC0 + 4 * (gpio / 4);
s = 8 * (gpio % 4);
/* read-modify-write */
t = ATH_READ_REG(AR71XX_GPIO_BASE + reg);
t &= ~(0xff << s);
t |= func << s;
ATH_WRITE_REG(AR71XX_GPIO_BASE + reg, t);
/* flush write */
ATH_READ_REG(AR71XX_GPIO_BASE + reg);
}
struct ar71xx_cpu_def ar934x_chip_def = {
&ar934x_chip_detect_mem_size,
&ar934x_chip_detect_sys_frequency,
&ar934x_chip_device_stop,
&ar934x_chip_device_start,
&ar934x_chip_device_stopped,
&ar934x_chip_set_pll_ge,
&ar934x_chip_set_mii_speed,
&ar934x_chip_set_mii_if,
&ar934x_chip_get_eth_pll,
&ar934x_chip_ddr_flush,
&ar934x_chip_init_usb_peripheral,
&ar934x_chip_reset_ethernet_switch,
&ar934x_chip_reset_wmac,
&ar934x_chip_init_gmac,
&ar934x_chip_reset_nfc,
&ar934x_chip_gpio_output_configure,
};