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freebsd-skq/sys/mips/atheros/ar71xx_chip.c
Adrian Chadd c37904e8ba 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

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/*-
* Copyright (c) 2010 Adrian Chadd
* 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/ar71xx_chip.h>
#include <mips/atheros/ar71xx_cpudef.h>
#include <mips/sentry5/s5reg.h>
/* XXX these should replace the current definitions in ar71xxreg.h */
/* XXX perhaps an ar71xx_chip.h header file? */
#define AR71XX_PLL_REG_CPU_CONFIG AR71XX_PLL_CPU_BASE + 0x00
#define AR71XX_PLL_REG_SEC_CONFIG AR71XX_PLL_CPU_BASE + 0x04
#define AR71XX_PLL_REG_ETH0_INT_CLOCK AR71XX_PLL_CPU_BASE + 0x10
#define AR71XX_PLL_REG_ETH1_INT_CLOCK AR71XX_PLL_CPU_BASE + 0x14
#define AR71XX_PLL_DIV_SHIFT 3
#define AR71XX_PLL_DIV_MASK 0x1f
#define AR71XX_CPU_DIV_SHIFT 16
#define AR71XX_CPU_DIV_MASK 0x3
#define AR71XX_DDR_DIV_SHIFT 18
#define AR71XX_DDR_DIV_MASK 0x3
#define AR71XX_AHB_DIV_SHIFT 20
#define AR71XX_AHB_DIV_MASK 0x7
/* XXX these shouldn't be in here - this file is a per-chip file */
/* XXX these should be in the top-level ar71xx type, not ar71xx -chip */
uint32_t u_ar71xx_cpu_freq;
uint32_t u_ar71xx_ahb_freq;
uint32_t u_ar71xx_ddr_freq;
uint32_t u_ar71xx_uart_freq;
uint32_t u_ar71xx_wdt_freq;
uint32_t u_ar71xx_refclk;
uint32_t u_ar71xx_mdio_freq;
static void
ar71xx_chip_detect_mem_size(void)
{
}
static void
ar71xx_chip_detect_sys_frequency(void)
{
uint32_t pll;
uint32_t freq;
uint32_t div;
u_ar71xx_mdio_freq = u_ar71xx_refclk = AR71XX_BASE_FREQ;
pll = ATH_READ_REG(AR71XX_PLL_REG_CPU_CONFIG);
div = ((pll >> AR71XX_PLL_DIV_SHIFT) & AR71XX_PLL_DIV_MASK) + 1;
freq = div * AR71XX_BASE_FREQ;
div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
u_ar71xx_cpu_freq = freq / div;
div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1;
u_ar71xx_ddr_freq = freq / div;
div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
u_ar71xx_ahb_freq = u_ar71xx_cpu_freq / div;
u_ar71xx_wdt_freq = u_ar71xx_cpu_freq / div;
u_ar71xx_uart_freq = u_ar71xx_cpu_freq / div;
}
/*
* This does not lock the CPU whilst doing the work!
*/
static void
ar71xx_chip_device_stop(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR71XX_RST_RESET);
ATH_WRITE_REG(AR71XX_RST_RESET, reg | mask);
}
static void
ar71xx_chip_device_start(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR71XX_RST_RESET);
ATH_WRITE_REG(AR71XX_RST_RESET, reg & ~mask);
}
static int
ar71xx_chip_device_stopped(uint32_t mask)
{
uint32_t reg;
reg = ATH_READ_REG(AR71XX_RST_RESET);
return ((reg & mask) == mask);
}
void
ar71xx_chip_set_mii_speed(uint32_t unit, uint32_t speed)
{
uint32_t val, reg, ctrl;
switch (unit) {
case 0:
reg = AR71XX_MII0_CTRL;
break;
case 1:
reg = AR71XX_MII1_CTRL;
break;
default:
printf("%s: invalid MII unit set for arge unit: %d\n",
__func__, unit);
return;
}
switch (speed) {
case 10:
ctrl = MII_CTRL_SPEED_10;
break;
case 100:
ctrl = MII_CTRL_SPEED_100;
break;
case 1000:
ctrl = MII_CTRL_SPEED_1000;
break;
default:
printf("%s: invalid MII speed (%d) set for arge unit: %d\n",
__func__, speed, unit);
return;
}
val = ATH_READ_REG(reg);
val &= ~(MII_CTRL_SPEED_MASK << MII_CTRL_SPEED_SHIFT);
val |= (ctrl & MII_CTRL_SPEED_MASK) << MII_CTRL_SPEED_SHIFT;
ATH_WRITE_REG(reg, val);
}
void
ar71xx_chip_set_mii_if(uint32_t unit, uint32_t mii_mode)
{
uint32_t val, reg, mii_if;
switch (unit) {
case 0:
reg = AR71XX_MII0_CTRL;
if (mii_mode == AR71XX_MII_MODE_GMII)
mii_if = MII0_CTRL_IF_GMII;
else if (mii_mode == AR71XX_MII_MODE_MII)
mii_if = MII0_CTRL_IF_MII;
else if (mii_mode == AR71XX_MII_MODE_RGMII)
mii_if = MII0_CTRL_IF_RGMII;
else if (mii_mode == AR71XX_MII_MODE_RMII)
mii_if = MII0_CTRL_IF_RMII;
else {
printf("%s: invalid MII mode (%d) for unit %d\n",
__func__, mii_mode, unit);
return;
}
break;
case 1:
reg = AR71XX_MII1_CTRL;
if (mii_mode == AR71XX_MII_MODE_RGMII)
mii_if = MII1_CTRL_IF_RGMII;
else if (mii_mode == AR71XX_MII_MODE_RMII)
mii_if = MII1_CTRL_IF_RMII;
else {
printf("%s: invalid MII mode (%d) for unit %d\n",
__func__, mii_mode, unit);
return;
}
break;
default:
printf("%s: invalid MII unit set for arge unit: %d\n",
__func__, unit);
return;
}
val = ATH_READ_REG(reg);
val &= ~(MII_CTRL_IF_MASK << MII_CTRL_IF_SHIFT);
val |= (mii_if & MII_CTRL_IF_MASK) << MII_CTRL_IF_SHIFT;
ATH_WRITE_REG(reg, val);
}
/* Speed is either 10, 100 or 1000 */
static void
ar71xx_chip_set_pll_ge(int unit, int speed, uint32_t pll)
{
switch (unit) {
case 0:
ar71xx_write_pll(AR71XX_PLL_SEC_CONFIG,
AR71XX_PLL_ETH_INT0_CLK, pll,
AR71XX_PLL_ETH0_SHIFT);
break;
case 1:
ar71xx_write_pll(AR71XX_PLL_SEC_CONFIG,
AR71XX_PLL_ETH_INT1_CLK, pll,
AR71XX_PLL_ETH1_SHIFT);
break;
default:
printf("%s: invalid PLL set for arge unit: %d\n",
__func__, unit);
return;
}
}
static void
ar71xx_chip_ddr_flush(ar71xx_flush_ddr_id_t id)
{
switch (id) {
case AR71XX_CPU_DDR_FLUSH_GE0:
ar71xx_ddr_flush(AR71XX_WB_FLUSH_GE0);
break;
case AR71XX_CPU_DDR_FLUSH_GE1:
ar71xx_ddr_flush(AR71XX_WB_FLUSH_GE1);
break;
case AR71XX_CPU_DDR_FLUSH_USB:
ar71xx_ddr_flush(AR71XX_WB_FLUSH_USB);
break;
case AR71XX_CPU_DDR_FLUSH_PCIE:
ar71xx_ddr_flush(AR71XX_WB_FLUSH_PCI);
break;
default:
printf("%s: invalid DDR flush id (%d)\n", __func__, id);
break;
}
}
static uint32_t
ar71xx_chip_get_eth_pll(unsigned int mac, int speed)
{
uint32_t pll;
switch (speed) {
case 10:
pll = PLL_ETH_INT_CLK_10;
break;
case 100:
pll = PLL_ETH_INT_CLK_100;
break;
case 1000:
pll = PLL_ETH_INT_CLK_1000;
break;
default:
printf("%s%d: invalid speed %d\n", __func__, mac, speed);
pll = 0;
}
return (pll);
}
static void
ar71xx_chip_init_usb_peripheral(void)
{
ar71xx_device_stop(RST_RESET_USB_OHCI_DLL |
RST_RESET_USB_HOST | RST_RESET_USB_PHY);
DELAY(1000);
ar71xx_device_start(RST_RESET_USB_OHCI_DLL |
RST_RESET_USB_HOST | RST_RESET_USB_PHY);
DELAY(1000);
ATH_WRITE_REG(AR71XX_USB_CTRL_CONFIG,
USB_CTRL_CONFIG_OHCI_DES_SWAP |
USB_CTRL_CONFIG_OHCI_BUF_SWAP |
USB_CTRL_CONFIG_EHCI_DES_SWAP |
USB_CTRL_CONFIG_EHCI_BUF_SWAP);
ATH_WRITE_REG(AR71XX_USB_CTRL_FLADJ,
(32 << USB_CTRL_FLADJ_HOST_SHIFT) |
(3 << USB_CTRL_FLADJ_A5_SHIFT));
DELAY(1000);
}
struct ar71xx_cpu_def ar71xx_chip_def = {
&ar71xx_chip_detect_mem_size,
&ar71xx_chip_detect_sys_frequency,
&ar71xx_chip_device_stop,
&ar71xx_chip_device_start,
&ar71xx_chip_device_stopped,
&ar71xx_chip_set_pll_ge,
&ar71xx_chip_set_mii_speed,
&ar71xx_chip_set_mii_if,
&ar71xx_chip_get_eth_pll,
&ar71xx_chip_ddr_flush,
&ar71xx_chip_init_usb_peripheral,
};
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