diff options
Diffstat (limited to 'arch/arm/common/uengine.c')
| -rw-r--r-- | arch/arm/common/uengine.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/arch/arm/common/uengine.c b/arch/arm/common/uengine.c deleted file mode 100644 index bef408f3d76..00000000000 --- a/arch/arm/common/uengine.c +++ /dev/null @@ -1,507 +0,0 @@ -/* - * Generic library functions for the microengines found on the Intel - * IXP2000 series of network processors. - * - * Copyright (C) 2004, 2005 Lennert Buytenhek <buytenh@wantstofly.org> - * Dedicated to Marija Kulikova. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License as - * published by the Free Software Foundation; either version 2.1 of the - * License, or (at your option) any later version. - */ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/string.h> -#include <linux/io.h> -#include <mach/hardware.h> -#include <asm/hardware/uengine.h> - -#if defined(CONFIG_ARCH_IXP2000) -#define IXP_UENGINE_CSR_VIRT_BASE IXP2000_UENGINE_CSR_VIRT_BASE -#define IXP_PRODUCT_ID IXP2000_PRODUCT_ID -#define IXP_MISC_CONTROL IXP2000_MISC_CONTROL -#define IXP_RESET1 IXP2000_RESET1 -#else -#if defined(CONFIG_ARCH_IXP23XX) -#define IXP_UENGINE_CSR_VIRT_BASE IXP23XX_UENGINE_CSR_VIRT_BASE -#define IXP_PRODUCT_ID IXP23XX_PRODUCT_ID -#define IXP_MISC_CONTROL IXP23XX_MISC_CONTROL -#define IXP_RESET1 IXP23XX_RESET1 -#else -#error unknown platform -#endif -#endif - -#define USTORE_ADDRESS 0x000 -#define USTORE_DATA_LOWER 0x004 -#define USTORE_DATA_UPPER 0x008 -#define CTX_ENABLES 0x018 -#define CC_ENABLE 0x01c -#define CSR_CTX_POINTER 0x020 -#define INDIRECT_CTX_STS 0x040 -#define ACTIVE_CTX_STS 0x044 -#define INDIRECT_CTX_SIG_EVENTS 0x048 -#define INDIRECT_CTX_WAKEUP_EVENTS 0x050 -#define NN_PUT 0x080 -#define NN_GET 0x084 -#define TIMESTAMP_LOW 0x0c0 -#define TIMESTAMP_HIGH 0x0c4 -#define T_INDEX_BYTE_INDEX 0x0f4 -#define LOCAL_CSR_STATUS 0x180 - -u32 ixp2000_uengine_mask; - -static void *ixp2000_uengine_csr_area(int uengine) -{ - return ((void *)IXP_UENGINE_CSR_VIRT_BASE) + (uengine << 10); -} - -/* - * LOCAL_CSR_STATUS=1 after a read or write to a microengine's CSR - * space means that the microengine we tried to access was also trying - * to access its own CSR space on the same clock cycle as we did. When - * this happens, we lose the arbitration process by default, and the - * read or write we tried to do was not actually performed, so we try - * again until it succeeds. - */ -u32 ixp2000_uengine_csr_read(int uengine, int offset) -{ - void *uebase; - u32 *local_csr_status; - u32 *reg; - u32 value; - - uebase = ixp2000_uengine_csr_area(uengine); - - local_csr_status = (u32 *)(uebase + LOCAL_CSR_STATUS); - reg = (u32 *)(uebase + offset); - do { - value = ixp2000_reg_read(reg); - } while (ixp2000_reg_read(local_csr_status) & 1); - - return value; -} -EXPORT_SYMBOL(ixp2000_uengine_csr_read); - -void ixp2000_uengine_csr_write(int uengine, int offset, u32 value) -{ - void *uebase; - u32 *local_csr_status; - u32 *reg; - - uebase = ixp2000_uengine_csr_area(uengine); - - local_csr_status = (u32 *)(uebase + LOCAL_CSR_STATUS); - reg = (u32 *)(uebase + offset); - do { - ixp2000_reg_write(reg, value); - } while (ixp2000_reg_read(local_csr_status) & 1); -} -EXPORT_SYMBOL(ixp2000_uengine_csr_write); - -void ixp2000_uengine_reset(u32 uengine_mask) -{ - u32 value; - - value = ixp2000_reg_read(IXP_RESET1) & ~ixp2000_uengine_mask; - - uengine_mask &= ixp2000_uengine_mask; - ixp2000_reg_wrb(IXP_RESET1, value | uengine_mask); - ixp2000_reg_wrb(IXP_RESET1, value); -} -EXPORT_SYMBOL(ixp2000_uengine_reset); - -void ixp2000_uengine_set_mode(int uengine, u32 mode) -{ - /* - * CTL_STR_PAR_EN: unconditionally enable parity checking on - * control store. - */ - mode |= 0x10000000; - ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mode); - - /* - * Enable updating of condition codes. - */ - ixp2000_uengine_csr_write(uengine, CC_ENABLE, 0x00002000); - - /* - * Initialise other per-microengine registers. - */ - ixp2000_uengine_csr_write(uengine, NN_PUT, 0x00); - ixp2000_uengine_csr_write(uengine, NN_GET, 0x00); - ixp2000_uengine_csr_write(uengine, T_INDEX_BYTE_INDEX, 0); -} -EXPORT_SYMBOL(ixp2000_uengine_set_mode); - -static int make_even_parity(u32 x) -{ - return hweight32(x) & 1; -} - -static void ustore_write(int uengine, u64 insn) -{ - /* - * Generate even parity for top and bottom 20 bits. - */ - insn |= (u64)make_even_parity((insn >> 20) & 0x000fffff) << 41; - insn |= (u64)make_even_parity(insn & 0x000fffff) << 40; - - /* - * Write to microstore. The second write auto-increments - * the USTORE_ADDRESS index register. - */ - ixp2000_uengine_csr_write(uengine, USTORE_DATA_LOWER, (u32)insn); - ixp2000_uengine_csr_write(uengine, USTORE_DATA_UPPER, (u32)(insn >> 32)); -} - -void ixp2000_uengine_load_microcode(int uengine, u8 *ucode, int insns) -{ - int i; - - /* - * Start writing to microstore at address 0. - */ - ixp2000_uengine_csr_write(uengine, USTORE_ADDRESS, 0x80000000); - for (i = 0; i < insns; i++) { - u64 insn; - - insn = (((u64)ucode[0]) << 32) | - (((u64)ucode[1]) << 24) | - (((u64)ucode[2]) << 16) | - (((u64)ucode[3]) << 8) | - ((u64)ucode[4]); - ucode += 5; - - ustore_write(uengine, insn); - } - - /* - * Pad with a few NOPs at the end (to avoid the microengine - * aborting as it prefetches beyond the last instruction), unless - * we run off the end of the instruction store first, at which - * point the address register will wrap back to zero. - */ - for (i = 0; i < 4; i++) { - u32 addr; - - addr = ixp2000_uengine_csr_read(uengine, USTORE_ADDRESS); - if (addr == 0x80000000) - break; - ustore_write(uengine, 0xf0000c0300ULL); - } - - /* - * End programming. - */ - ixp2000_uengine_csr_write(uengine, USTORE_ADDRESS, 0x00000000); -} -EXPORT_SYMBOL(ixp2000_uengine_load_microcode); - -void ixp2000_uengine_init_context(int uengine, int context, int pc) -{ - /* - * Select the right context for indirect access. - */ - ixp2000_uengine_csr_write(uengine, CSR_CTX_POINTER, context); - - /* - * Initialise signal masks to immediately go to Ready state. - */ - ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_SIG_EVENTS, 1); - ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_WAKEUP_EVENTS, 1); - - /* - * Set program counter. - */ - ixp2000_uengine_csr_write(uengine, INDIRECT_CTX_STS, pc); -} -EXPORT_SYMBOL(ixp2000_uengine_init_context); - -void ixp2000_uengine_start_contexts(int uengine, u8 ctx_mask) -{ - u32 mask; - - /* - * Enable the specified context to go to Executing state. - */ - mask = ixp2000_uengine_csr_read(uengine, CTX_ENABLES); - mask |= ctx_mask << 8; - ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mask); -} -EXPORT_SYMBOL(ixp2000_uengine_start_contexts); - -void ixp2000_uengine_stop_contexts(int uengine, u8 ctx_mask) -{ - u32 mask; - - /* - * Disable the Ready->Executing transition. Note that this - * does not stop the context until it voluntarily yields. - */ - mask = ixp2000_uengine_csr_read(uengine, CTX_ENABLES); - mask &= ~(ctx_mask << 8); - ixp2000_uengine_csr_write(uengine, CTX_ENABLES, mask); -} -EXPORT_SYMBOL(ixp2000_uengine_stop_contexts); - -static int check_ixp_type(struct ixp2000_uengine_code *c) -{ - u32 product_id; - u32 rev; - - product_id = ixp2000_reg_read(IXP_PRODUCT_ID); - if (((product_id >> 16) & 0x1f) != 0) - return 0; - - switch ((product_id >> 8) & 0xff) { -#ifdef CONFIG_ARCH_IXP2000 - case 0: /* IXP2800 */ - if (!(c->cpu_model_bitmask & 4)) - return 0; - break; - - case 1: /* IXP2850 */ - if (!(c->cpu_model_bitmask & 8)) - return 0; - break; - - case 2: /* IXP2400 */ - if (!(c->cpu_model_bitmask & 2)) - return 0; - break; -#endif - -#ifdef CONFIG_ARCH_IXP23XX - case 4: /* IXP23xx */ - if (!(c->cpu_model_bitmask & 0x3f0)) - return 0; - break; -#endif - - default: - return 0; - } - - rev = product_id & 0xff; - if (rev < c->cpu_min_revision || rev > c->cpu_max_revision) - return 0; - - return 1; -} - -static void generate_ucode(u8 *ucode, u32 *gpr_a, u32 *gpr_b) -{ - int offset; - int i; - - offset = 0; - - for (i = 0; i < 128; i++) { - u8 b3; - u8 b2; - u8 b1; - u8 b0; - - b3 = (gpr_a[i] >> 24) & 0xff; - b2 = (gpr_a[i] >> 16) & 0xff; - b1 = (gpr_a[i] >> 8) & 0xff; - b0 = gpr_a[i] & 0xff; - - /* immed[@ai, (b1 << 8) | b0] */ - /* 11110000 0000VVVV VVVV11VV VVVVVV00 1IIIIIII */ - ucode[offset++] = 0xf0; - ucode[offset++] = (b1 >> 4); - ucode[offset++] = (b1 << 4) | 0x0c | (b0 >> 6); - ucode[offset++] = (b0 << 2); - ucode[offset++] = 0x80 | i; - - /* immed_w1[@ai, (b3 << 8) | b2] */ - /* 11110100 0100VVVV VVVV11VV VVVVVV00 1IIIIIII */ - ucode[offset++] = 0xf4; - ucode[offset++] = 0x40 | (b3 >> 4); - ucode[offset++] = (b3 << 4) | 0x0c | (b2 >> 6); - ucode[offset++] = (b2 << 2); - ucode[offset++] = 0x80 | i; - } - - for (i = 0; i < 128; i++) { - u8 b3; - u8 b2; - u8 b1; - u8 b0; - - b3 = (gpr_b[i] >> 24) & 0xff; - b2 = (gpr_b[i] >> 16) & 0xff; - b1 = (gpr_b[i] >> 8) & 0xff; - b0 = gpr_b[i] & 0xff; - - /* immed[@bi, (b1 << 8) | b0] */ - /* 11110000 0000VVVV VVVV001I IIIIII11 VVVVVVVV */ - ucode[offset++] = 0xf0; - ucode[offset++] = (b1 >> 4); - ucode[offset++] = (b1 << 4) | 0x02 | (i >> 6); - ucode[offset++] = (i << 2) | 0x03; - ucode[offset++] = b0; - - /* immed_w1[@bi, (b3 << 8) | b2] */ - /* 11110100 0100VVVV VVVV001I IIIIII11 VVVVVVVV */ - ucode[offset++] = 0xf4; - ucode[offset++] = 0x40 | (b3 >> 4); - ucode[offset++] = (b3 << 4) | 0x02 | (i >> 6); - ucode[offset++] = (i << 2) | 0x03; - ucode[offset++] = b2; - } - - /* ctx_arb[kill] */ - ucode[offset++] = 0xe0; - ucode[offset++] = 0x00; - ucode[offset++] = 0x01; - ucode[offset++] = 0x00; - ucode[offset++] = 0x00; -} - -static int set_initial_registers(int uengine, struct ixp2000_uengine_code *c) -{ - int per_ctx_regs; - u32 *gpr_a; - u32 *gpr_b; - u8 *ucode; - int i; - - gpr_a = kzalloc(128 * sizeof(u32), GFP_KERNEL); - gpr_b = kzalloc(128 * sizeof(u32), GFP_KERNEL); - ucode = kmalloc(513 * 5, GFP_KERNEL); - if (gpr_a == NULL || gpr_b == NULL || ucode == NULL) { - kfree(ucode); - kfree(gpr_b); - kfree(gpr_a); - return 1; - } - - per_ctx_regs = 16; - if (c->uengine_parameters & IXP2000_UENGINE_4_CONTEXTS) - per_ctx_regs = 32; - - for (i = 0; i < 256; i++) { - struct ixp2000_reg_value *r = c->initial_reg_values + i; - u32 *bank; - int inc; - int j; - - if (r->reg == -1) - break; - - bank = (r->reg & 0x400) ? gpr_b : gpr_a; - inc = (r->reg & 0x80) ? 128 : per_ctx_regs; - - j = r->reg & 0x7f; - while (j < 128) { - bank[j] = r->value; - j += inc; - } - } - - generate_ucode(ucode, gpr_a, gpr_b); - ixp2000_uengine_load_microcode(uengine, ucode, 513); - ixp2000_uengine_init_context(uengine, 0, 0); - ixp2000_uengine_start_contexts(uengine, 0x01); - for (i = 0; i < 100; i++) { - u32 status; - - status = ixp2000_uengine_csr_read(uengine, ACTIVE_CTX_STS); - if (!(status & 0x80000000)) - break; - } - ixp2000_uengine_stop_contexts(uengine, 0x01); - - kfree(ucode); - kfree(gpr_b); - kfree(gpr_a); - - return !!(i == 100); -} - -int ixp2000_uengine_load(int uengine, struct ixp2000_uengine_code *c) -{ - int ctx; - - if (!check_ixp_type(c)) - return 1; - - if (!(ixp2000_uengine_mask & (1 << uengine))) - return 1; - - ixp2000_uengine_reset(1 << uengine); - ixp2000_uengine_set_mode(uengine, c->uengine_parameters); - if (set_initial_registers(uengine, c)) - return 1; - ixp2000_uengine_load_microcode(uengine, c->insns, c->num_insns); - - for (ctx = 0; ctx < 8; ctx++) - ixp2000_uengine_init_context(uengine, ctx, 0); - - return 0; -} -EXPORT_SYMBOL(ixp2000_uengine_load); - - -static int __init ixp2000_uengine_init(void) -{ - int uengine; - u32 value; - - /* - * Determine number of microengines present. - */ - switch ((ixp2000_reg_read(IXP_PRODUCT_ID) >> 8) & 0x1fff) { -#ifdef CONFIG_ARCH_IXP2000 - case 0: /* IXP2800 */ - case 1: /* IXP2850 */ - ixp2000_uengine_mask = 0x00ff00ff; - break; - - case 2: /* IXP2400 */ - ixp2000_uengine_mask = 0x000f000f; - break; -#endif - -#ifdef CONFIG_ARCH_IXP23XX - case 4: /* IXP23xx */ - ixp2000_uengine_mask = (*IXP23XX_EXP_CFG_FUSE >> 8) & 0xf; - break; -#endif - - default: - printk(KERN_INFO "Detected unknown IXP2000 model (%.8x)\n", - (unsigned int)ixp2000_reg_read(IXP_PRODUCT_ID)); - ixp2000_uengine_mask = 0x00000000; - break; - } - - /* - * Reset microengines. - */ - ixp2000_uengine_reset(ixp2000_uengine_mask); - - /* - * Synchronise timestamp counters across all microengines. - */ - value = ixp2000_reg_read(IXP_MISC_CONTROL); - ixp2000_reg_wrb(IXP_MISC_CONTROL, value & ~0x80); - for (uengine = 0; uengine < 32; uengine++) { - if (ixp2000_uengine_mask & (1 << uengine)) { - ixp2000_uengine_csr_write(uengine, TIMESTAMP_LOW, 0); - ixp2000_uengine_csr_write(uengine, TIMESTAMP_HIGH, 0); - } - } - ixp2000_reg_wrb(IXP_MISC_CONTROL, value | 0x80); - - return 0; -} - -subsys_initcall(ixp2000_uengine_init); |