aspeed: Add basic ast2500-specific drivers and configuration
Clock Driver
This driver is ast2500-specific and is not compatible with earlier
versions of this chip. The differences are not that big, but they are
in somewhat random places, so making it compatible with ast2400 is not
worth the effort at the moment.
SDRAM MC driver
The driver is very ast2500-specific and is completely incompatible
with previous versions of the chip.
The memory controller is very poorly documented by Aspeed in the
datasheet, with any mention of the whole range of registers missing. The
initialization procedure has been basically taken from Aspeed SDK, where
it is implemented in assembly. Here it is rewritten in C, with very limited
understanding of what exactly it is doing.
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/include/asm/arch-aspeed/scu_ast2500.h b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
new file mode 100644
index 0000000..fc0c01a
--- /dev/null
+++ b/arch/arm/include/asm/arch-aspeed/scu_ast2500.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#ifndef _ASM_ARCH_SCU_AST2500_H
+#define _ASM_ARCH_SCU_AST2500_H
+
+#define SCU_UNLOCK_VALUE 0x1688a8a8
+
+#define SCU_HWSTRAP_VGAMEM_MASK 3
+#define SCU_HWSTRAP_VGAMEM_SHIFT 2
+#define SCU_HWSTRAP_DDR4 (1 << 24)
+#define SCU_HWSTRAP_CLKIN_25MHZ (1 << 23)
+
+#define SCU_MPLL_DENUM_SHIFT 0
+#define SCU_MPLL_DENUM_MASK 0x1f
+#define SCU_MPLL_NUM_SHIFT 5
+#define SCU_MPLL_NUM_MASK 0xff
+#define SCU_MPLL_POST_SHIFT 13
+#define SCU_MPLL_POST_MASK 0x3f
+
+#define SCU_HPLL_DENUM_SHIFT 0
+#define SCU_HPLL_DENUM_MASK 0x1f
+#define SCU_HPLL_NUM_SHIFT 5
+#define SCU_HPLL_NUM_MASK 0xff
+#define SCU_HPLL_POST_SHIFT 13
+#define SCU_HPLL_POST_MASK 0x3f
+
+#define SCU_MISC2_UARTCLK_SHIFT 24
+
+#define SCU_MISC_UARTCLK_DIV13 (1 << 12)
+
+#ifndef __ASSEMBLY__
+
+struct ast2500_clk_priv {
+ struct ast2500_scu *scu;
+};
+
+struct ast2500_scu {
+ u32 protection_key;
+ u32 sysreset_ctrl1;
+ u32 clk_sel1;
+ u32 clk_stop_ctrl1;
+ u32 freq_counter_ctrl;
+ u32 freq_counter_cmp;
+ u32 intr_ctrl;
+ u32 d2_pll_param;
+ u32 m_pll_param;
+ u32 h_pll_param;
+ u32 d_pll_param;
+ u32 misc_ctrl1;
+ u32 pci_config[3];
+ u32 sysreset_status;
+ u32 vga_handshake[2];
+ u32 mac_clk_delay;
+ u32 misc_ctrl2;
+ u32 vga_scratch[8];
+ u32 hwstrap;
+ u32 rng_ctrl;
+ u32 rng_data;
+ u32 rev_id;
+ u32 pinmux_ctrl[6];
+ u32 reserved0;
+ u32 extrst_sel;
+ u32 pinmux_ctrl1[4];
+ u32 reserved1[2];
+ u32 mac_clk_delay_100M;
+ u32 mac_clk_delay_10M;
+ u32 wakeup_enable;
+ u32 wakeup_control;
+ u32 reserved2[3];
+ u32 sysreset_ctrl2;
+ u32 clk_sel2;
+ u32 clk_stop_ctrl2;
+ u32 freerun_counter;
+ u32 freerun_counter_ext;
+ u32 clk_duty_meas_ctrl;
+ u32 clk_duty_meas_res;
+ u32 reserved3[4];
+ /* The next registers are not key-protected */
+ struct ast2500_cpu2 {
+ u32 ctrl;
+ u32 base_addr[9];
+ u32 cache_ctrl;
+ } cpu2;
+ u32 reserved4;
+ u32 d_pll_ext_param[3];
+ u32 d2_pll_ext_param[3];
+ u32 mh_pll_ext_param;
+ u32 reserved5;
+ u32 chip_id[2];
+ u32 reserved6[2];
+ u32 uart_clk_ctrl;
+ u32 reserved7[7];
+ u32 pcie_config;
+ u32 mmio_decode;
+ u32 reloc_ctrl_decode[2];
+ u32 mailbox_addr;
+ u32 shared_sram_decode[2];
+ u32 bmc_rev_id;
+ u32 reserved8;
+ u32 bmc_device_id;
+ u32 reserved9[13];
+ u32 clk_duty_sel;
+};
+
+/**
+ * ast_get_clk() - get a pointer to Clock Driver
+ *
+ * @devp, OUT - pointer to Clock Driver
+ * @return zero on success, error code (< 0) otherwise.
+ */
+int ast_get_clk(struct udevice **devp);
+
+/**
+ * ast_get_scu() - get a pointer to SCU registers
+ *
+ * @return pointer to struct ast2500_scu on success, ERR_PTR otherwise
+ */
+void *ast_get_scu(void);
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_ARCH_SCU_AST2500_H */