powerpc/mpc85xx: Add workaround to enable TDM on T1040

This is a workaround for 32 bit hardware limitation of TDM.
T1040 has 36 bit physical addressing, TDM DMAC register
are 32 bit wide but need to store address of CCSR space
which lies beyond 32 bit address range. This workaround
creats a LAW to enable access of TDM DMA to CCSR by
mapping CCSR to overlap with DDR.
A hole of 16M is created in memory using device tree. This
workaround law is set only if "tdm" is defined in hwconfig.
Also disable POST tests and add LIODN for TDM

Signed-off-by: Sandeep Singh <Sandeep@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index d6cf885..78316a6 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -225,6 +225,32 @@ static void disable_cpc_sram(void)
 }
 #endif
 
+#if defined(T1040_TDM_QUIRK_CCSR_BASE)
+#ifdef CONFIG_POST
+#error POST memory test cannot be enabled with TDM
+#endif
+static void enable_tdm_law(void)
+{
+       int ret;
+       char buffer[HWCONFIG_BUFFER_SIZE] = {0};
+       int tdm_hwconfig_enabled = 0;
+
+       /*
+        * Extract hwconfig from environment since environment
+        * is not setup properly yet. Search for tdm entry in
+        * hwconfig.
+        */
+       ret = getenv_f("hwconfig", buffer, sizeof(buffer));
+       if (ret > 0) {
+               tdm_hwconfig_enabled = hwconfig_f("tdm", buffer);
+               /* If tdm is defined in hwconfig, set law for tdm workaround */
+               if (tdm_hwconfig_enabled)
+                       set_next_law(T1040_TDM_QUIRK_CCSR_BASE, LAW_SIZE_16M,
+                                    LAW_TRGT_IF_CCSR);
+       }
+}
+#endif
+
 static void enable_cpc(void)
 {
        int i;
@@ -729,6 +755,9 @@ skip_l2:
        disable_cpc_sram();
 #endif
        enable_cpc();
+#if defined(T1040_TDM_QUIRK_CCSR_BASE)
+       enable_tdm_law();
+#endif
 
 #ifndef CONFIG_SYS_FSL_NO_SERDES
        /* needs to be in ram since code uses global static vars */

diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c
index ed80a84..85dfa5b 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/fdt.c
+++ b/arch/powerpc/cpu/mpc85xx/fdt.c
@@ -14,6 +14,7 @@
 #include <linux/ctype.h>
 #include <asm/io.h>
 #include <asm/fsl_portals.h>
+#include <hwconfig.h>
 #ifdef CONFIG_FSL_ESDHC
 #include <fsl_esdhc.h>
 #endif
@@ -35,6 +36,11 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
        u32 bootpg = determine_mp_bootpg(NULL);
        u32 id = get_my_id();
        const char *enable_method;
+#if defined(T1040_TDM_QUIRK_CCSR_BASE)
+       int ret;
+       int tdm_hwconfig_enabled = 0;
+       char buffer[HWCONFIG_BUFFER_SIZE] = {0};
+#endif
 
        off = fdt_node_offset_by_prop_value(blob, -1, "device_type", "cpu", 4);
        while (off != -FDT_ERR_NOTFOUND) {
@@ -77,6 +83,26 @@ void ft_fixup_cpu(void *blob, u64 memory_limit)
                                "device_type", "cpu", 4);
        }
 
+#if defined(T1040_TDM_QUIRK_CCSR_BASE)
+#define        CONFIG_MEM_HOLE_16M     0x1000000
+       /*
+        * Extract hwconfig from environment.
+        * Search for tdm entry in hwconfig.
+        */
+       ret = getenv_f("hwconfig", buffer, sizeof(buffer));
+       if (ret > 0)
+               tdm_hwconfig_enabled = hwconfig_f("tdm", buffer);
+
+       /* Reserve the memory hole created by TDM LAW, so OSes dont use it */
+       if (tdm_hwconfig_enabled) {
+               off = fdt_add_mem_rsv(blob, T1040_TDM_QUIRK_CCSR_BASE,
+                                     CONFIG_MEM_HOLE_16M);
+               if (off < 0)
+                       printf("Failed  to reserve memory for tdm: %s\n",
+                              fdt_strerror(off));
+       }
+#endif
+
        /* Reserve the boot page so OSes dont use it */
        if ((u64)bootpg < memory_limit) {
                off = fdt_add_mem_rsv(blob, bootpg, (u64)4096);

diff --git a/arch/powerpc/cpu/mpc85xx/t1040_ids.c b/arch/powerpc/cpu/mpc85xx/t1040_ids.c
index 1034cd4..a5dfb81 100644 (file)
--- a/arch/powerpc/cpu/mpc85xx/t1040_ids.c
+++ b/arch/powerpc/cpu/mpc85xx/t1040_ids.c
@@ -47,6 +47,7 @@ struct liodn_id_table liodn_tbl[] = {
 
        /* SET_NEXUS_LIODN(557), -- not yet implemented */
        SET_QE_LIODN(559),
+       SET_TDM_LIODN(560),
 };
 int liodn_tbl_sz = ARRAY_SIZE(liodn_tbl);
 

diff --git a/arch/powerpc/include/asm/fsl_law.h b/arch/powerpc/include/asm/fsl_law.h
index 37d3a22..3b50487 100644 (file)
--- a/arch/powerpc/include/asm/fsl_law.h
+++ b/arch/powerpc/include/asm/fsl_law.h
@@ -68,6 +68,7 @@ enum law_trgt_if {
        LAW_TRGT_IF_DDR_INTLV_1234 = 0x16,
        LAW_TRGT_IF_BMAN = 0x18,
        LAW_TRGT_IF_DCSR = 0x1d,
+       LAW_TRGT_IF_CCSR = 0x1e,
        LAW_TRGT_IF_LBC = 0x1f,
        LAW_TRGT_IF_QMAN = 0x3c,
 

diff --git a/arch/powerpc/include/asm/fsl_liodn.h b/arch/powerpc/include/asm/fsl_liodn.h
index f658bcb..adfbb66 100644 (file)
--- a/arch/powerpc/include/asm/fsl_liodn.h
+++ b/arch/powerpc/include/asm/fsl_liodn.h
@@ -103,6 +103,10 @@ extern void fdt_fixup_liodn(void *blob);
        SET_GUTS_LIODN("fsl,qe", liodn, qeliodnr,\
                CONFIG_SYS_MPC85xx_QE_OFFSET)
 
+#define SET_TDM_LIODN(liodn) \
+       SET_GUTS_LIODN("fsl,tdm1.0", liodn, tdmliodnr,\
+               CONFIG_SYS_MPC85xx_TDM_OFFSET)
+
 #define SET_QMAN_LIODN(liodn) \
        SET_LIODN_ENTRY_1("fsl,qman", liodn, offsetof(ccsr_qman_t, liodnr) + \
                CONFIG_SYS_FSL_QMAN_OFFSET, \

diff --git a/arch/powerpc/include/asm/immap_85xx.h b/arch/powerpc/include/asm/immap_85xx.h
index fe1dcc2..8258ab3 100644 (file)
--- a/arch/powerpc/include/asm/immap_85xx.h
+++ b/arch/powerpc/include/asm/immap_85xx.h
@@ -1899,7 +1899,8 @@ defined(CONFIG_PPC_T1020) || defined(CONFIG_PPC_T1022)
        u32     sata2liodnr;    /* SATA 2 LIODN */
        u32     sata3liodnr;    /* SATA 3 LIODN */
        u32     sata4liodnr;    /* SATA 4 LIODN */
-       u8      res22[24];
+       u8      res22[20];
+       u32     tdmliodnr;      /* TDM LIODN */
        u32     qeliodnr;       /* QE LIODN */
        u8      res_57c[4];
        u32     dma1liodnr;     /* DMA 1 LIODN */
@@ -2915,6 +2916,7 @@ struct ccsr_sfp_regs {
 #define CONFIG_SYS_MPC85xx_LBC_OFFSET          0x124000
 #define CONFIG_SYS_MPC85xx_IFC_OFFSET          0x124000
 #define CONFIG_SYS_MPC85xx_GPIO_OFFSET         0x130000
+#define CONFIG_SYS_MPC85xx_TDM_OFFSET          0x185000
 #define CONFIG_SYS_MPC85xx_QE_OFFSET           0x140000
 #define CONFIG_SYS_FSL_CORENET_RMAN_OFFSET     0x1e0000
 #if defined(CONFIG_SYS_FSL_QORIQ_CHASSIS2) && !defined(CONFIG_PPC_B4860)\

diff --git a/include/configs/T1040QDS.h b/include/configs/T1040QDS.h
index 2215ac8..f2a75ae 100644 (file)
--- a/include/configs/T1040QDS.h
+++ b/include/configs/T1040QDS.h
@@ -201,6 +201,12 @@ unsigned long get_board_ddr_clk(void);
                                CSPR_MSEL_NOR | \
                                CSPR_V)
 #define CONFIG_SYS_NOR_AMASK   IFC_AMASK(128*1024*1024)
+
+/*
+ * TDM Definition
+ */
+#define T1040_TDM_QUIRK_CCSR_BASE      0xfe000000
+
 /* NOR Flash Timing Params */
 #define CONFIG_SYS_NOR_CSOR    CSOR_NAND_TRHZ_80
 #define CONFIG_SYS_NOR_FTIM0   (FTIM0_NOR_TACSE(0x4) | \

diff --git a/include/configs/T104xRDB.h b/include/configs/T104xRDB.h
index e564cb7..8d6c51b 100644 (file)
--- a/include/configs/T104xRDB.h
+++ b/include/configs/T104xRDB.h
@@ -230,6 +230,12 @@
                                CSPR_MSEL_NOR | \
                                CSPR_V)
 #define CONFIG_SYS_NOR_AMASK   IFC_AMASK(128*1024*1024)
+
+/*
+ * TDM Definition
+ */
+#define T1040_TDM_QUIRK_CCSR_BASE      0xfe000000
+
 /* NOR Flash Timing Params */
 #define CONFIG_SYS_NOR_CSOR    CSOR_NAND_TRHZ_80
 #define CONFIG_SYS_NOR_FTIM0   (FTIM0_NOR_TACSE(0x4) | \