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-rw-r--r--arch/arm/mach-uniphier/arm32/debug_ll.S186
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/arm32/debug_ll.S b/arch/arm/mach-uniphier/arm32/debug_ll.S
new file mode 100644
index 0000000000..a70954cbee
--- /dev/null
+++ b/arch/arm/mach-uniphier/arm32/debug_ll.S
@@ -0,0 +1,186 @@
+/*
+ * On-chip UART initializaion for low-level debugging
+ *
+ * Copyright (C) 2014-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <linux/serial_reg.h>
+#include <linux/linkage.h>
+
+#include "../bcu/bcu-regs.h"
+#include "../sc-regs.h"
+#include "../sg-regs.h"
+
+#if !defined(CONFIG_DEBUG_SEMIHOSTING)
+#include CONFIG_DEBUG_LL_INCLUDE
+#endif
+
+#define BAUDRATE 115200
+#define DIV_ROUND(x, d) (((x) + ((d) / 2)) / (d))
+
+ENTRY(debug_ll_init)
+ ldr r0, =SG_REVISION
+ ldr r1, [r0]
+ and r1, r1, #SG_REVISION_TYPE_MASK
+ mov r1, r1, lsr #SG_REVISION_TYPE_SHIFT
+
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_SLD3)
+#define PH1_SLD3_UART_CLK 36864000
+ cmp r1, #0x25
+ bne ph1_sld3_end
+
+ sg_set_pinsel 64, 1, 4, 4, r0, r1 @ TXD0 -> TXD0
+
+ ldr r0, =BCSCR5
+ ldr r1, =0x24440000
+ str r1, [r0]
+
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CEN_PERI
+ str r1, [r0]
+
+ ldr r3, =DIV_ROUND(PH1_SLD3_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_sld3_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_LD4)
+#define PH1_LD4_UART_CLK 36864000
+ cmp r1, #0x26
+ bne ph1_ld4_end
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ sg_set_pinsel 88, 1, 8, 4, r0, r1 @ HSDOUT6 -> TXD0
+
+ ldr r3, =DIV_ROUND(PH1_LD4_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_ld4_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_PRO4)
+#define PH1_PRO4_UART_CLK 73728000
+ cmp r1, #0x28
+ bne ph1_pro4_end
+
+ sg_set_pinsel 128, 0, 4, 8, r0, r1 @ TXD0 -> TXD0
+
+ ldr r0, =SG_LOADPINCTRL
+ mov r1, #1
+ str r1, [r0]
+
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CEN_PERI
+ str r1, [r0]
+
+ ldr r3, =DIV_ROUND(PH1_PRO4_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_pro4_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_SLD8)
+#define PH1_SLD8_UART_CLK 80000000
+ cmp r1, #0x29
+ bne ph1_sld8_end
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ sg_set_pinsel 70, 3, 8, 4, r0, r1 @ HSDOUT0 -> TXD0
+
+ ldr r3, =DIV_ROUND(PH1_SLD8_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_sld8_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_PRO5)
+#define PH1_PRO5_UART_CLK 73728000
+ cmp r1, #0x2A
+ bne ph1_pro5_end
+
+ sg_set_pinsel 47, 0, 4, 8, r0, r1 @ TXD0 -> TXD0
+ sg_set_pinsel 49, 0, 4, 8, r0, r1 @ TXD1 -> TXD1
+ sg_set_pinsel 51, 0, 4, 8, r0, r1 @ TXD2 -> TXD2
+ sg_set_pinsel 53, 0, 4, 8, r0, r1 @ TXD3 -> TXD3
+
+ ldr r0, =SG_LOADPINCTRL
+ mov r1, #1
+ str r1, [r0]
+
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CEN_PERI
+ str r1, [r0]
+
+ ldr r3, =DIV_ROUND(PH1_PRO5_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_pro5_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PROXSTREAM2)
+#define PROXSTREAM2_UART_CLK 88900000
+ cmp r1, #0x2E
+ bne proxstream2_end
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ sg_set_pinsel 217, 8, 8, 4, r0, r1 @ TXD0 -> TXD0
+ sg_set_pinsel 115, 8, 8, 4, r0, r1 @ TXD1 -> TXD1
+ sg_set_pinsel 113, 8, 8, 4, r0, r1 @ TXD2 -> TXD2
+ sg_set_pinsel 219, 8, 8, 4, r0, r1 @ TXD3 -> TXD3
+
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CEN_PERI
+ str r1, [r0]
+
+ ldr r3, =DIV_ROUND(PROXSTREAM2_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+proxstream2_end:
+#endif
+#if defined(CONFIG_ARCH_UNIPHIER_PH1_LD6B)
+#define PH1_LD6B_UART_CLK 88900000
+ cmp r1, #0x2F
+ bne ph1_ld6b_end
+
+ ldr r0, =SG_IECTRL
+ ldr r1, [r0]
+ orr r1, r1, #1
+ str r1, [r0]
+
+ sg_set_pinsel 135, 3, 8, 4, r0, r1 @ PORT10 -> TXD0
+ sg_set_pinsel 115, 0, 8, 4, r0, r1 @ TXD1 -> TXD1
+ sg_set_pinsel 113, 2, 8, 4, r0, r1 @ SBO0 -> TXD2
+
+ ldr r0, =SC_CLKCTRL
+ ldr r1, [r0]
+ orr r1, r1, #SC_CLKCTRL_CEN_PERI
+ str r1, [r0]
+
+ ldr r3, =DIV_ROUND(PH1_LD6B_UART_CLK, 16 * BAUDRATE)
+
+ b init_uart
+ph1_ld6b_end:
+#endif
+
+init_uart:
+ addruart r0, r1, r2
+ mov r1, #UART_LCR_WLEN8 << 8
+ str r1, [r0, #0x10]
+ str r3, [r0, #0x24]
+
+ mov pc, lr
+ENDPROC(debug_ll_init)
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