lantiq: add pcie endianess switch for slave devices

The Fritzbox 3490, 5490 and 7490 devices have a Renesas µPD720202
USB3 PCIe device, which requires an endian switch for PCIe slave
devices. The flag and setting is not implemented in the available
patches. Since adding this setting would break other devices,
a DTB setting lantiq,switch-pcie-endianess is added for selective
enablement.

Signed-off-by: Daniel Kestrel <[email protected]>

target/linux/lantiq/patches-5.15/0001-MIPS-lantiq-add-pcie-driver.patch

@@ -3913,6 +3913,7 @@ Signed-off-by: John Crispin <[email protected]>
 +#define IFX_RCU_AHB_BE_PCIE_M                    0x00000001  /* Configure AHB master port that connects to PCIe RC in big endian */
 +#define IFX_RCU_AHB_BE_PCIE_S                    0x00000010  /* Configure AHB slave port that connects to PCIe RC in little endian */
 +#define IFX_RCU_AHB_BE_XBAR_M                    0x00000002  /* Configure AHB master port that connects to XBAR in big endian */
++#define IFX_RCU_AHB_BE_XBAR_S                    0x00000008  /* Configure AHB slave port that connects to XBAR in big endian */
 +#define CONFIG_IFX_PCIE_PHY_36MHZ_MODE
 +
 +#define IFX_PMU1_MODULE_PCIE_PHY   (0)
@@ -4159,7 +4160,6 @@ Signed-off-by: John Crispin <[email protected]>
 +}
 +
 +#endif /* IFXMIPS_PCIE_VR9_H */
-+
 --- a/arch/mips/pci/pci-legacy.c
 +++ b/arch/mips/pci/pci-legacy.c
 @@ -305,3 +305,30 @@ char *__init pcibios_setup(char *str)

target/linux/lantiq/patches-5.15/0151-lantiq-ifxmips_pcie-use-of.patch

@@ -39,7 +39,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  #include "ifxmips_pcie.h"
  #include "ifxmips_pcie_reg.h"
  
-@@ -40,6 +47,10 @@
+@@ -40,6 +47,11 @@
  static DEFINE_SPINLOCK(ifx_pcie_lock);
  
  u32 g_pcie_debug_flag = PCIE_MSG_ANY & (~PCIE_MSG_CFG);
@@ -47,10 +47,11 @@ Signed-off-by: Eddi De Pieri <[email protected]>
 +static struct phy *ltq_pcie_phy;
 +static struct reset_control *ltq_pcie_reset;
 +static struct regmap *ltq_rcu_regmap;
++static bool switch_pcie_endianess;
  
  static ifx_pcie_irq_t pcie_irqs[IFX_PCIE_CORE_NR] = {
      {
-@@ -82,6 +93,22 @@ void ifx_pcie_debug(const char *fmt, ...
+@@ -82,6 +94,22 @@ void ifx_pcie_debug(const char *fmt, ...
  	printk("%s", buf);
  }
  
@@ -73,7 +74,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  
  static inline int pcie_ltssm_enable(int pcie_port)
  {
-@@ -988,10 +1015,22 @@ int  ifx_pcie_bios_plat_dev_init(struct
+@@ -988,10 +1016,26 @@ int  ifx_pcie_bios_plat_dev_init(struct
  static int
  pcie_rc_initialize(int pcie_port)
  {
@@ -88,6 +89,10 @@ Signed-off-by: Eddi De Pieri <[email protected]>
 +#ifdef CONFIG_IFX_PCIE_HW_SWAP
 +	regmap_update_bits(ltq_rcu_regmap, 0x4c, IFX_RCU_AHB_BE_PCIE_S,
 +			   IFX_RCU_AHB_BE_PCIE_S);
++       if (switch_pcie_endianess) {
++	        regmap_update_bits(ltq_rcu_regmap, 0x4c, IFX_RCU_AHB_BE_XBAR_S,
++			           IFX_RCU_AHB_BE_XBAR_S);
++       }
 +#else
 +	regmap_update_bits(ltq_rcu_regmap, 0x4c, IFX_RCU_AHB_BE_PCIE_S,
 +			   0x0);
@@ -98,7 +103,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  
  	pcie_ep_gpio_rst_init(pcie_port);
  
-@@ -1000,26 +1039,21 @@ pcie_rc_initialize(int pcie_port)
+@@ -1000,26 +1044,21 @@ pcie_rc_initialize(int pcie_port)
  	* reset PCIe PHY will solve this issue 
  	*/
  	for (i = 0; i < IFX_PCIE_PHY_LOOP_CNT; i++) {
@@ -135,7 +140,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  
  		/* Enable PCIe PHY and Clock */
  		pcie_core_pmu_setup(pcie_port);
-@@ -1035,6 +1069,10 @@ pcie_rc_initialize(int pcie_port)
+@@ -1035,6 +1074,10 @@ pcie_rc_initialize(int pcie_port)
  		/* Once link is up, break out */
  		if (pcie_app_loigc_setup(pcie_port) == 0)
  			break;
@@ -146,7 +151,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  	}
  	if (i >= IFX_PCIE_PHY_LOOP_CNT) {
  		printk(KERN_ERR "%s link up failed!!!!!\n", __func__);
-@@ -1045,17 +1083,67 @@ pcie_rc_initialize(int pcie_port)
+@@ -1045,17 +1088,74 @@ pcie_rc_initialize(int pcie_port)
  	return 0;
  }
  
@@ -199,6 +204,13 @@ Signed-off-by: Eddi De Pieri <[email protected]>
 +        return PTR_ERR(ltq_pcie_reset);
 +    }
 +
++    if (of_property_read_bool(node, "lantiq,switch-pcie-endianess")) {
++        switch_pcie_endianess = true;
++        dev_info(&pdev->dev, "switch pcie endianess requested\n");
++    } else {
++        switch_pcie_endianess = false;
++    }
++
 +    ltq_rcu_regmap = syscon_regmap_lookup_by_phandle(node, "lantiq,rcu");
 +    if (IS_ERR(ltq_rcu_regmap))
 +        return PTR_ERR(ltq_rcu_regmap);
@@ -216,7 +228,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
      for (pcie_port = startup_port; pcie_port < IFX_PCIE_CORE_NR; pcie_port++){
  	if (pcie_rc_initialize(pcie_port) == 0) {
  	    IFX_PCIE_PRINT(PCIE_MSG_INIT, "%s: ifx_pcie_cfg_base 0x%p\n", 
-@@ -1067,6 +1155,7 @@ static int __init ifx_pcie_bios_init(voi
+@@ -1067,6 +1167,7 @@ static int __init ifx_pcie_bios_init(voi
                  return -ENOMEM;
              }
              ifx_pcie_controller[pcie_port].pcic.io_map_base = (unsigned long)io_map_base;
@@ -224,7 +236,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  
              register_pci_controller(&ifx_pcie_controller[pcie_port].pcic);
              /* XXX, clear error status */
-@@ -1083,6 +1172,30 @@ static int __init ifx_pcie_bios_init(voi
+@@ -1083,6 +1184,30 @@ static int __init ifx_pcie_bios_init(voi
  
      return 0;
  }
@@ -266,7 +278,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  #define IFX_REG_R32    ltq_r32
  #define IFX_REG_W32    ltq_w32
  #define CONFIG_IFX_PCIE_HW_SWAP
-@@ -53,21 +51,6 @@
+@@ -54,21 +52,6 @@
  #define OUT			((volatile u32*)(IFX_GPIO + 0x0070))
  
  
@@ -288,7 +300,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  static inline void pcie_ahb_pmu_setup(void) 
  {
  	/* Enable AHB bus master/slave */
-@@ -79,24 +62,6 @@ static inline void pcie_ahb_pmu_setup(vo
+@@ -80,24 +63,6 @@ static inline void pcie_ahb_pmu_setup(vo
      //AHBS_PMU_SETUP(IFX_PMU_ENABLE);
  }
  
@@ -313,7 +325,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  static inline void pcie_phy_pmu_enable(int pcie_port)
  {
  	struct clk *clk;
-@@ -115,17 +80,6 @@ static inline void pcie_phy_pmu_disable(
+@@ -116,17 +81,6 @@ static inline void pcie_phy_pmu_disable(
  //    PCIE_PHY_PMU_SETUP(IFX_PMU_DISABLE);
  }
  
@@ -331,7 +343,7 @@ Signed-off-by: Eddi De Pieri <[email protected]>
  static inline void pcie_pdi_pmu_enable(int pcie_port)
  {
      /* Enable PDI to access PCIe PHY register */
-@@ -135,65 +89,6 @@ static inline void pcie_pdi_pmu_enable(i
+@@ -136,65 +90,6 @@ static inline void pcie_pdi_pmu_enable(i
      //PDI_PMU_SETUP(IFX_PMU_ENABLE);
  }