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linux-stable/arch/arm/mach-imx/mach-imx6q.c
Oleksij Rempel 5e16360a01 ARM: imx6q: skip ethernet refclock reconfiguration if enet_clk_ref is present 
Current mach-imx6q code has following logic:
- if ptp clock of the ethernet controller node is attached to the SoC
  internal enet_ref clock, then we configure RMII reference clock pin as
  output by setting IOMUXC_GPR1 BIT(21).
  In this case - MAC (SoC) is the clock provider, PHY is the clock consumer.
- if ptp clock of the ethernet controller node is not attached to the
  enet_ref clock, then we configure RMII reference clock pin as input by
  clearing IOMUXC_GPR1 BIT(21).
  In this case - PHY is the clock provider, MAC is the clock consumer.

According to the Freescale MX6SDL ReferenceManual v4, IOMUXC_GPR1 BIT(21)
(page 2033) this configuration bit is not related to the PTP (IEEE1588)
clock:
21 ENET_CLK_SEL - choose enet reference clk mode:
   0 - get enet tx reference clk from pad (external OSC for both external
       PHY and Internal Controller)
   1 - get enet tx reference clk from internal clock from anatop (loopback
       through pad), this clock also sent out to external PHY.

According to the Documentation/devicetree/bindings/net/fsl,fec.yaml:
      The "ptp"(option), for IEEE1588 timer clock that requires the clock.
      The "enet_clk_ref"(option), for MAC transmit/receiver reference clock
      like RGMII TXC clock or RMII reference clock. It depends on board
      design, the clock is required if RGMII TXC and RMII reference clock
      source from SOC internal PLL.
      The "enet_out"(option), output clock for external device, like supply
      clock for PHY. The clock is required if PHY clock source from SOC.

We can see, that "enet_clk_ref" clock is the best fit for this purpose.
Other properties like "ptp" is designed for IEEE1588 and "enet_out" do
not have real functionality within imx related clock infrastructure.

Since the "enet_clk_ref" is not used by the imx6qdl devicetrees, we can
use it as indicator of potentially properly configured DT. At same time
we can keep ptp clock based logic as the fallback for old DTs.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
2023-03-06 09:57:02 +08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2011-2013 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*/
#include <linux/clk.h>
#include <linux/irqchip.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/phy.h>
#include <linux/regmap.h>
#include <linux/micrel_phy.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
/* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
static int ksz9021rn_phy_fixup(struct phy_device *phydev)
{
if (IS_BUILTIN(CONFIG_PHYLIB)) {
/* min rx data delay */
phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
0x8000 | MICREL_KSZ9021_RGMII_RX_DATA_PAD_SCEW);
phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0x0000);
/* max rx/tx clock delay, min rx/tx control delay */
phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
0x8000 | MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
phy_write(phydev, MICREL_KSZ9021_EXTREG_DATA_WRITE, 0xf0f0);
phy_write(phydev, MICREL_KSZ9021_EXTREG_CTRL,
MICREL_KSZ9021_RGMII_CLK_CTRL_PAD_SCEW);
}
return 0;
}
/*
* fixup for PLX PEX8909 bridge to configure GPIO1-7 as output High
* as they are used for slots1-7 PERST#
*/
static void ventana_pciesw_early_fixup(struct pci_dev *dev)
{
u32 dw;
if (!of_machine_is_compatible("gw,ventana"))
return;
if (dev->devfn != 0)
return;
pci_read_config_dword(dev, 0x62c, &dw);
dw |= 0xaaa8; // GPIO1-7 outputs
pci_write_config_dword(dev, 0x62c, dw);
pci_read_config_dword(dev, 0x644, &dw);
dw |= 0xfe; // GPIO1-7 output high
pci_write_config_dword(dev, 0x644, dw);
msleep(100);
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8609, ventana_pciesw_early_fixup);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8606, ventana_pciesw_early_fixup);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_PLX, 0x8604, ventana_pciesw_early_fixup);
static void __init imx6q_enet_phy_init(void)
{
if (IS_BUILTIN(CONFIG_PHYLIB)) {
phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
ksz9021rn_phy_fixup);
}
}
static void __init imx6q_1588_init(void)
{
struct device_node *np;
struct clk *ptp_clk, *fec_enet_ref;
struct clk *enet_ref;
struct regmap *gpr;
u32 clksel;
np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-fec");
if (!np) {
pr_warn("%s: failed to find fec node\n", __func__);
return;
}
/*
* If enet_clk_ref configured, we assume DT did it properly and .
* clk-imx6q.c will do needed configuration.
*/
fec_enet_ref = of_clk_get_by_name(np, "enet_clk_ref");
if (!IS_ERR(fec_enet_ref))
goto put_node;
ptp_clk = of_clk_get(np, 2);
if (IS_ERR(ptp_clk)) {
pr_warn("%s: failed to get ptp clock\n", __func__);
goto put_node;
}
enet_ref = clk_get_sys(NULL, "enet_ref");
if (IS_ERR(enet_ref)) {
pr_warn("%s: failed to get enet clock\n", __func__);
goto put_ptp_clk;
}
/*
* If enet_ref from ANATOP/CCM is the PTP clock source, we need to
* set bit IOMUXC_GPR1[21]. Or the PTP clock must be from pad
* (external OSC), and we need to clear the bit.
*/
clksel = clk_is_match(ptp_clk, enet_ref) ?
IMX6Q_GPR1_ENET_CLK_SEL_ANATOP :
IMX6Q_GPR1_ENET_CLK_SEL_PAD;
gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
if (!IS_ERR(gpr))
regmap_update_bits(gpr, IOMUXC_GPR1,
IMX6Q_GPR1_ENET_CLK_SEL_MASK,
clksel);
else
pr_err("failed to find fsl,imx6q-iomuxc-gpr regmap\n");
clk_put(enet_ref);
put_ptp_clk:
clk_put(ptp_clk);
put_node:
of_node_put(np);
}
static void __init imx6q_axi_init(void)
{
struct regmap *gpr;
unsigned int mask;
gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
if (!IS_ERR(gpr)) {
/*
* Enable the cacheable attribute of VPU and IPU
* AXI transactions.
*/
mask = IMX6Q_GPR4_VPU_WR_CACHE_SEL |
IMX6Q_GPR4_VPU_RD_CACHE_SEL |
IMX6Q_GPR4_VPU_P_WR_CACHE_VAL |
IMX6Q_GPR4_VPU_P_RD_CACHE_VAL_MASK |
IMX6Q_GPR4_IPU_WR_CACHE_CTL |
IMX6Q_GPR4_IPU_RD_CACHE_CTL;
regmap_update_bits(gpr, IOMUXC_GPR4, mask, mask);
/* Increase IPU read QoS priority */
regmap_update_bits(gpr, IOMUXC_GPR6,
IMX6Q_GPR6_IPU1_ID00_RD_QOS_MASK |
IMX6Q_GPR6_IPU1_ID01_RD_QOS_MASK,
(0xf << 16) | (0x7 << 20));
regmap_update_bits(gpr, IOMUXC_GPR7,
IMX6Q_GPR7_IPU2_ID00_RD_QOS_MASK |
IMX6Q_GPR7_IPU2_ID01_RD_QOS_MASK,
(0xf << 16) | (0x7 << 20));
} else {
pr_warn("failed to find fsl,imx6q-iomuxc-gpr regmap\n");
}
}
static void __init imx6q_init_machine(void)
{
if (cpu_is_imx6q() && imx_get_soc_revision() >= IMX_CHIP_REVISION_2_0)
/*
* SoCs that identify as i.MX6Q >= rev 2.0 are really i.MX6QP.
* Quirk: i.MX6QP revision = i.MX6Q revision - (1, 0),
* e.g. i.MX6QP rev 1.1 identifies as i.MX6Q rev 2.1.
*/
imx_print_silicon_rev("i.MX6QP", imx_get_soc_revision() - 0x10);
else
imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
imx_get_soc_revision());
imx6q_enet_phy_init();
of_platform_default_populate(NULL, NULL, NULL);
imx_anatop_init();
cpu_is_imx6q() ? imx6q_pm_init() : imx6dl_pm_init();
imx6q_1588_init();
imx6q_axi_init();
}
static void __init imx6q_init_late(void)
{
/*
* WAIT mode is broken on imx6 Dual/Quad revision 1.0 and 1.1 so
* there is no point to run cpuidle on them.
*
* It does work on imx6 Solo/DualLite starting from 1.1
*/
if ((cpu_is_imx6q() && imx_get_soc_revision() > IMX_CHIP_REVISION_1_1) ||
(cpu_is_imx6dl() && imx_get_soc_revision() > IMX_CHIP_REVISION_1_0))
imx6q_cpuidle_init();
if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ))
platform_device_register_simple("imx6q-cpufreq", -1, NULL, 0);
}
static void __init imx6q_map_io(void)
{
debug_ll_io_init();
imx_scu_map_io();
}
static void __init imx6q_init_irq(void)
{
imx_gpc_check_dt();
imx_init_revision_from_anatop();
imx_init_l2cache();
imx_src_init();
irqchip_init();
imx6_pm_ccm_init("fsl,imx6q-ccm");
}
static const char * const imx6q_dt_compat[] __initconst = {
"fsl,imx6dl",
"fsl,imx6q",
"fsl,imx6qp",
NULL,
};
DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
.l2c_aux_val = 0,
.l2c_aux_mask = ~0,
.smp = smp_ops(imx_smp_ops),
.map_io = imx6q_map_io,
.init_irq = imx6q_init_irq,
.init_machine = imx6q_init_machine,
.init_late = imx6q_init_late,
.dt_compat = imx6q_dt_compat,
MACHINE_END
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