This patch adds support for mtmips SoCs to initialize the SDRAM.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v3 changes: none v2 changes: none --- arch/mips/mach-mtmips/ddr_init.c | 59 ++++++++++++++++++++++++ arch/mips/mach-mtmips/include/mach/ddr.h | 4 ++ 2 files changed, 63 insertions(+)
diff --git a/arch/mips/mach-mtmips/ddr_init.c b/arch/mips/mach-mtmips/ddr_init.c index 6c6d0933f2..9c986daea6 100644 --- a/arch/mips/mach-mtmips/ddr_init.c +++ b/arch/mips/mach-mtmips/ddr_init.c @@ -15,6 +15,13 @@
#define DDR_BW_TEST_PAT 0xaa5555aa
+static const u32 sdr_size_cfg1[] = { + [DRAM_8MB] = (1 << NUMROWS_S), + [DRAM_16MB] = (1 << NUMROWS_S) | (1 << NUMCOLS_S), + [DRAM_32MB] = (2 << NUMROWS_S) | (1 << NUMCOLS_S), + [DRAM_64MB] = (2 << NUMROWS_S) | (2 << NUMCOLS_S), +}; + static const u32 dram_size[] = { [DRAM_8MB] = SZ_8M, [DRAM_16MB] = SZ_16M, @@ -193,3 +200,55 @@ void ddr2_init(struct mc_ddr_init_param *param) param->memsize = dram_size[sz]; param->bus_width = bw; } + +static void mc_sdr_init(void __iomem *memc, mc_reset_t mc_reset, u32 cfg0, + u32 cfg1) +{ + mc_reset(1); + __udelay(200); + mc_reset(0); + + writel(cfg0, memc + MEMCTL_SDRAM_CFG0_REG); + writel(cfg1, memc + MEMCTL_SDRAM_CFG1_REG); + + while (!(readl(memc + MEMCTL_SDRAM_CFG1_REG) & SDRAM_INIT_DONE)) + ; + + clrsetbits_32(memc + MEMCTL_PWR_SAVE_CNT_REG, SR_TAR_CNT_M, + 1 << SR_TAR_CNT_S); + + setbits_32(memc + MEMCTL_DDR_SELF_REFRESH_REG, SR_AUTO_EN); +} + +void sdr_init(struct mc_ddr_init_param *param) +{ + enum mc_dram_size sz; + u32 cfg1; + + cfg1 = param->sdr_cfg1 | SDRAM_INIT_START; + cfg1 &= ~(NUMCOLS_M | NUMROWS_M); + + /* First initialization, determine SDR capacity */ + mc_sdr_init(param->memc, param->mc_reset, param->sdr_cfg0, + cfg1 | sdr_size_cfg1[DRAM_64MB]); + + if (dram_addr_test_bit(9)) { + sz = DRAM_8MB; + } else { + if (dram_addr_test_bit(10)) { + if (dram_addr_test_bit(23)) + sz = DRAM_16MB; + else + sz = DRAM_32MB; + } else { + sz = DRAM_64MB; + } + } + + /* Final initialization */ + mc_sdr_init(param->memc, param->mc_reset, param->sdr_cfg0, + cfg1 | sdr_size_cfg1[sz]); + + /* Return actual DDR configuration */ + param->memsize = dram_size[sz]; +} diff --git a/arch/mips/mach-mtmips/include/mach/ddr.h b/arch/mips/mach-mtmips/include/mach/ddr.h index f92198137b..15ff66ace6 100644 --- a/arch/mips/mach-mtmips/include/mach/ddr.h +++ b/arch/mips/mach-mtmips/include/mach/ddr.h @@ -35,6 +35,9 @@ typedef void (*mc_reset_t)(int assert); struct mc_ddr_init_param { void __iomem *memc;
+ u32 sdr_cfg0; + u32 sdr_cfg1; + u32 dq_dly; u32 dqs_dly;
@@ -45,6 +48,7 @@ struct mc_ddr_init_param { u32 bus_width; };
+void sdr_init(struct mc_ddr_init_param *param); void ddr1_init(struct mc_ddr_init_param *param); void ddr2_init(struct mc_ddr_init_param *param); void ddr_calibrate(void __iomem *memc, u32 memsize, u32 bw);