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Diffstat (limited to 'arch/arm/mach-mx5/mx50_ddr_freq.S')
-rw-r--r--arch/arm/mach-mx5/mx50_ddr_freq.S479
1 files changed, 479 insertions, 0 deletions
diff --git a/arch/arm/mach-mx5/mx50_ddr_freq.S b/arch/arm/mach-mx5/mx50_ddr_freq.S
new file mode 100644
index 000000000000..7628b6a7c7e6
--- /dev/null
+++ b/arch/arm/mach-mx5/mx50_ddr_freq.S
@@ -0,0 +1,479 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * mx50_ddr_freq_change
+ *
+ * Idle the processor (eg, wait for interrupt).
+ * Make sure DDR is in self-refresh.
+ * IRQs are already disabled.
+ */
+ENTRY(mx50_ddr_freq_change)
+ stmfd sp!, {r3,r4,r5,r6} @ Save registers
+
+ mov r6, r0 @save CCM address
+ mov r5, r1 @save DataBahn address
+ mov r4, r2 @save new freq requested
+
+ ldr r0, [r6, #0x90]
+
+ /* If Databahn is in LPM4, exit that mode first. */
+ ldr r1,[r5, #0x50] @Store LPM mode in r1.
+ mov r0, r1
+ bic r0, #0x1F
+ str r0,[r5, #0x50]
+
+LoopCKE2:
+ /*Wait for CKE = 1 */
+ ldr r0,[r5, #0xfc]
+ and r0, r0, #0x10000
+ ldr r2, =0x10000
+ cmp r0, r2
+ bne LoopCKE2
+
+ /*
+ * Make sure the DDR is self-refresh, before switching its frequency
+ * and clock source
+ */
+
+ /* Step 1: Enter self-refresh mode */
+ ldr r0,[r5, #0x4c]
+ orr r0,r0,#0x1
+ str r0,[r5, #0x4c]
+
+ /* Step 2: Poll the CKE_STATUS bit. */
+LoopCKE0:
+ /* Wait for CKE = 0 */
+ ldr r0,[r5, #0xfc]
+ and r0, r0, #0x10000
+ ldr r2, =0x10000
+ cmp r0, r2
+ beq LoopCKE0
+
+ /* Step 3: Mask the DLL lock state change, set bit 8 in int_mask. */
+ ldr r0, [r5, #0xac]
+ orr r0, r0, #0x100
+ str r0, [r5, #0xac]
+
+ /* Step 4: Stop the Controller. */
+ ldr r0,[r5]
+ bic r0, r0, #0x1
+ str r0,[r5]
+
+ /* Step 5: Clear the DLL lock state change bit 8 in int_ack */
+ ldr r0, [r5, #0xa8]
+ orr r0, r0, #0x1000000
+ str r0, [r5, #0xa8]
+
+ /* Step 6: Clear the interrupt mask for DLL lock state.
+ * Bit 8 in int_mask */
+ ldr r0, [r5, #0xac]
+ bic r0, r0, #0x100
+ str r0, [r5, #0xac]
+
+ /* Change the freq now */
+ /* If the freq req is below 24MHz, set DDR to synchronous mode.
+ * else set to async mode. */
+ ldr r0, =24000000
+ cmp r4, r0
+ bgt Async_Mode
+
+ /* Set the DDR to be Synchronous
+ mode. */
+ /* Set the Databahn to sync mode. */
+ ldr r0, [r5, #0xdc]
+ orr r0, r0, #0x30000
+ str r0, [r5, #0xdc]
+
+ /* Turn OFF the DDR_CKLGATE_MASK in MXC_CCM_DDR */
+ ldr r0, [r6, #0x98]
+ bic r0, r0, #0xC0000000
+ str r0, [r6, #0x98]
+
+ /* Check if XTAL can source the DDR. */
+ ldr r0, =24000000
+ cmp r4, r0
+ ble databahn_ddr_24
+
+ /*Source DDR from PLL1. Setup the dividers accordingly. */
+ ldr r0, =800000000
+ ldr r3, =1
+Loop1:
+ sub r0, r0, r4
+ cmp r0, r4
+ blt Div_Found
+ add r3, r3, #1
+ bgt Loop1
+
+Div_Found:
+ ldr r0, [r6, #0x94]
+ bic r0, r0, #0x3f
+ orr r0, r0, r3
+ str r0, [r6, #0x94]
+ /* Set the DDR to sourced from PLL1 in sync path */
+ ldr r0, [r6, #0x90]
+ orr r0, r0, #0x3
+ str r0, [r6, #0x90]
+
+ /* Turn OFF the DDR_CKLGATE_MASK in MXC_CCM_DDR */
+ ldr r0, [r6, #0x98]
+ bic r0, r0, #0xC0000000
+ str r0, [r6, #0x98]
+
+ ldr r0, =24000000
+ cmp r4, r0
+ beq databahn_ddr_24
+
+ b Ddr_not_24
+
+databahn_ddr_24:
+ ldr r0, =0x00000003
+ str r0, [r5, #0x08]
+ ldr r0, =0x000012c0
+ str r0, [r5, #0x0c]
+
+ ldr r0, =0x00000018
+ str r0, [r5, #0x10]
+ ldr r0, =0x000000f0
+ str r0, [r5, #0x14]
+ ldr r0, =0x02010b0c
+ str r0, [r5, #0x18]
+ ldr r0, =0x02020102
+ str r0, [r5, #0x1c]
+
+ ldr r0, =0x05010102
+ str r0, [r5, #0x20]
+ ldr r0, =0x01000103
+ str r0, [r5, #0x28]
+ ldr r0, =0x04030101
+ str r0, [r5, #0x2c]
+
+ ldr r0, =0x00000202
+ str r0, [r5, #0x34]
+ ldr r0, =0x00000001
+ str r0, [r5, #0x38]
+ ldr r0, =0x00000401
+ str r0, [r5, #0x3c]
+
+ ldr r0, =0x00050056
+ str r0, [r5, #0x40]
+ ldr r0, =0x00040004
+ str r0, [r5, #0x48]
+
+ ldr r0, =0x00040022
+ str r0, [r5, #0x6c]
+
+ ldr r0, =0x00040022
+ str r0, [r5, #0x78]
+
+ ldr r0, =0x00180000
+ str r0, [r5, #0x80]
+ ldr r0, =0x00000009
+ str r0, [r5, #0x84]
+ ldr r0, =0x02400003
+ str r0, [r5, #0x88]
+ ldr r0, =0x01000200
+ str r0, [r5, #0x8c]
+
+ ldr r0, =0x00000000
+ str r0, [r5, #0xcc]
+
+ ldr r0, =0x01000201
+ str r0, [r5, #0xd0]
+ ldr r0, =0x01010301
+ str r0, [r5, #0xd4]
+ ldr r0, =0x00000101
+ str r0, [r5, #0xd8]
+
+ ldr r0, =0x02000602
+ str r0, [r5, #0x104]
+ ldr r0, =0x00560000
+ str r0, [r5, #0x108]
+ ldr r0, =0x00560056
+ str r0, [r5, #0x10c]
+
+ ldr r0, =0x00560056
+ str r0, [r5, #0x110]
+ ldr r0, =0x03060056
+ str r0, [r5, #0x114]
+
+ /* Set the Databahn DLL in bypass mode */
+ /* PHY Register settings. */
+ ldr r0, =0x00000100
+ str r0, [r5, #0x200]
+ ldr r0, =0x000f1100
+ str r0, [r5, #0x204]
+ ldr r0, =0xf3003a27
+ str r0, [r5, #0x208]
+ ldr r0, =0x074002c1
+ str r0, [r5, #0x20c]
+
+ ldr r0, =0xf3003a27
+ str r0, [r5, #0x210]
+ ldr r0, =0x074002c1
+ str r0, [r5, #0x214]
+ ldr r0, =0xf3003a27
+ str r0, [r5, #0x218]
+ ldr r0, =0x074002c1
+ str r0, [r5, #0x21c]
+
+ ldr r0, =0xf3003a27
+ str r0, [r5, #0x220]
+ ldr r0, =0x074002c1
+ str r0, [r5, #0x224]
+ ldr r0, =0xf3003a27
+ str r0, [r5, #0x228]
+ ldr r0, =0x074002c1
+ str r0, [r5, #0x22c]
+
+ ldr r0, =0x00810004
+ str r0, [r5, #0x234]
+ ldr r0, =0x30219f14
+ str r0, [r5, #0x238]
+ ldr r0, =0x00219f01
+ str r0, [r5, #0x23c]
+
+ ldr r0, =0x30219f14
+ str r0, [r5, #0x240]
+ ldr r0, =0x00219f01
+ str r0, [r5, #0x244]
+ ldr r0, =0x30219f14
+ str r0, [r5, #0x248]
+ ldr r0, =0x00219f01
+ str r0, [r5, #0x24c]
+
+ ldr r0, =0x30219f14
+ str r0, [r5, #0x250]
+ ldr r0, =0x00219f01
+ str r0, [r5, #0x254]
+ ldr r0, =0x30219f14
+ str r0, [r5, #0x258]
+ ldr r0, =0x00219f01
+ str r0, [r5, #0x25c]
+
+ b Setup_Done
+
+Async_Mode:
+ /* Set the Databahn to async mode. */
+ ldr r0, [r5, #0xdc]
+ and r0, r0, #0xfffcffff
+ str r0, [r5, #0xdc]
+
+ /*Source DDR from PLL1. Setup the dividers accordingly. */
+ ldr r0, =800000000
+ ldr r3, =1
+Loop2:
+ sub r0, r0, r4
+ cmp r0, r4
+ blt Div_Found1
+ add r3, r3, #1
+ bgt Loop2
+
+Div_Found1:
+ ldr r0, [r6, #0x98]
+ bic r0, r0, #0x3f
+ orr r0, r0, r3
+ str r0, [r6, #0x98]
+
+ /* Set the DDR to sourced from PLL1 in async path */
+ ldr r0, [r6, #0x98]
+ bic r0, r0, #0x40
+ str r0, [r6, #0x98]
+
+ /* Turn ON the DDR_CKLGATE_MASK in MXC_CCM_DDR */
+ ldr r0, [r6, #0x98]
+ orr r0, r0, #0x40000000
+ str r0, [r6, #0x98]
+
+ ldr r0, =24000000
+ cmp r4, r0
+ beq databahn_ddr_24
+
+Ddr_not_24:
+ ldr r0, =0x0000001b
+ str r0, [r5, #0x8]
+ ldr r0, =0x0000d056
+ str r0, [r5, #0xc]
+
+ ldr r0, =0x0000010b
+ str r0, [r5, #0x10]
+ ldr r0, =0x00000a6b
+ str r0, [r5, #0x14]
+ ldr r0, =0x02020d0c
+ str r0, [r5, #0x18]
+ ldr r0, =0x0c110302
+ str r0, [r5, #0x1c]
+
+ ldr r0, =0x05020503
+ str r0, [r5, #0x20]
+ ldr r0, =0x01000403
+ str r0, [r5, #0x28]
+ ldr r0, =0x09040501
+ str r0, [r5, #0x2c]
+
+ ldr r0, =0x00000e02
+ str r0, [r5, #0x34]
+ ldr r0, =0x00000006
+ str r0, [r5, #0x38]
+ ldr r0, =0x00002301
+ str r0, [r5, #0x3c]
+
+ ldr r0, =0x00050408
+ str r0, [r5, #0x40]
+ ldr r0, =0x00260026
+ str r0, [r5, #0x48]
+
+ ldr r0, =0x00040042
+ str r0, [r5, #0x6c]
+
+ ldr r0, =0x00040042
+ str r0, [r5, #0x78]
+
+ ldr r0, =0x010b0000
+ str r0, [r5, #0x80]
+ ldr r0, =0x00000060
+ str r0, [r5, #0x84]
+ ldr r0, =0x02400018
+ str r0, [r5, #0x88]
+ ldr r0, =0x01000e00
+ str r0, [r5, #0x8c]
+
+ ldr r0, =0x01000000
+ str r0, [r5, #0xcc]
+
+ ldr r0, =0x01000201
+ str r0, [r5, #0xd0]
+ ldr r0, =0x00000200
+ str r0, [r5, #0xd4]
+ ldr r0, =0x00000102
+ str r0, [r5, #0xd8]
+
+ ldr r0, =0x02000802
+ str r0, [r5, #0x104]
+ ldr r0, =0x04080000
+ str r0, [r5, #0x108]
+ ldr r0, =0x04080408
+ str r0, [r5, #0x10c]
+
+ ldr r0, =0x04080408
+ str r0, [r5, #0x110]
+ ldr r0, =0x03060408
+ str r0, [r5, #0x114]
+
+ /* PHY setting for 266MHz */
+ ldr r0, =0x00000000
+ str r0, [r5, #0x200]
+ ldr r0, =0x00000000
+ str r0, [r5, #0x204]
+ ldr r0, =0xf5003a27
+ str r0, [r5, #0x208]
+
+ ldr r0, =0xf5003a27
+ str r0, [r5, #0x210]
+ ldr r0, =0xf5003a27
+ str r0, [r5, #0x218]
+
+ ldr r0, =0xf5003a27
+ str r0, [r5, #0x220]
+ ldr r0, =0xf5003a27
+ str r0, [r5, #0x228]
+
+ ldr r0, =0x074002e1
+ str r0, [r5, #0x20c]
+ ldr r0, =0x074002e1
+ str r0, [r5, #0x214]
+ ldr r0, =0x074002e1
+ str r0, [r5, #0x21c]
+ ldr r0, =0x074002e1
+ str r0, [r5, #0x224]
+ ldr r0, =0x074002e1
+ str r0, [r5, #0x22c]
+
+ ldr r0, =0x00810006
+ str r0, [r5, #0x234]
+ ldr r0, =0x20099414
+ str r0, [r5, #0x238]
+ ldr r0, =0x000a1401
+ str r0, [r5, #0x23c]
+
+ ldr r0, =0x20099414
+ str r0, [r5, #0x240]
+ ldr r0, =0x000a1401
+ str r0, [r5, #0x244]
+ ldr r0, =0x20099414
+ str r0, [r5, #0x248]
+ ldr r0, =0x000a1401
+ str r0, [r5, #0x24c]
+
+ ldr r0, =0x20099414
+ str r0, [r5, #0x250]
+ ldr r0, =0x000a1401
+ str r0, [r5, #0x254]
+ ldr r0, =0x20099414
+ str r0, [r5, #0x258]
+ ldr r0, =0x000a1401
+ str r0, [r5, #0x25c]
+
+ b Setup_Done
+
+
+Setup_Done:
+ /* Start controller */
+ ldr r0,[r5]
+ orr r0, r0,#0x1
+ str r0,[r5]
+
+ /* Poll the DLL lock state change in int_status reg*/
+ /* DLL is bypassed in the 24MHz mode, so no waiting for DLL to lock. */
+ ldr r0, =24000000
+ cmp r4, r0
+ beq Exit_Self_Refresh
+DllLock:
+ ldr r0, [r5, #0xa8]
+ and r0, r0, #0x100
+ ldr r2, =0x100
+ cmp r0, r2
+ bne DllLock
+
+ /*Leave self-refresh mode */
+Exit_Self_Refresh:
+ ldr r0,[r5, #0x4c]
+ and r0,r0,#0xfffffffe
+ str r0,[r5, #0x4c]
+
+LoopCKE1:
+ /*Wait for CKE = 1 */
+ ldr r0,[r5, #0xfc]
+ and r0, r0, #0x10000
+ ldr r2, =0x10000
+ cmp r0, r2
+ bne LoopCKE1
+
+ /* Put the databahn back to into the LPM mode. */
+ str r1,[r5, #0x50]
+
+ /* Restore registers */
+ ldmfd sp!, {r3,r4,r5,r6}
+ mov pc, lr
+
+ .type mx50_do_ddr_freq_change, #object
+ENTRY(mx50_do_ddr_freq_change)
+ .word mx50_ddr_freq_change
+ .size mx50_ddr_freq_change, . - mx50_ddr_freq_change
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