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/*
* Copyright (C) ST-Ericsson SA 2011
*
* Author: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
* License terms: GNU General Public License (GPL) version 2
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/tee.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/hardware/cache-l2x0.h>
static struct tee_session session;
static struct tee_context context;
static void __iomem *l2x0_base;
#define L2X0_PREFETCH_CTRL_REG (0x00000F60)
#define L2X0_PREFETCH_CTRL_BIT_DATA_EN (1 << 28)
#define L2X0_PREFETCH_CTRL_BIT_INST_EN (1 << 29)
#define L2X0_UUID_TEE_TA_START_LOW 0xBC765EDE
#define L2X0_UUID_TEE_TA_START_MID 0x6724
#define L2X0_UUID_TEE_TA_START_HIGH 0x11DF
#define L2X0_UUID_TEE_TA_START_CLOCKSEQ \
{0x8E, 0x12, 0xEC, 0xDB, 0xDF, 0xD7, 0x20, 0x85}
static void prefetch_enable(void)
{
struct tee_operation operation;
u32 data;
int err;
int origin_err;
data = readl(l2x0_base + L2X0_PREFETCH_CTRL_REG);
pr_debug("l2x0-prefetch: %s start, preftect_ctrl=0x%08x\n", __func__,
data);
if (!(data & L2X0_PREFETCH_CTRL_BIT_INST_EN) ||
!(data & L2X0_PREFETCH_CTRL_BIT_DATA_EN)) {
data |= (L2X0_PREFETCH_CTRL_BIT_INST_EN |
L2X0_PREFETCH_CTRL_BIT_DATA_EN);
operation.shm[0].buffer = &data;
operation.shm[0].size = sizeof(data);
operation.shm[0].flags = TEEC_MEM_INPUT;
operation.flags = TEEC_MEMREF_0_USED;
err = teec_invoke_command(&session,
TEE_STA_SET_L2CC_PREFETCH_CTRL_REGISTER,
&operation, &origin_err);
if (err)
pr_err("l2x0-prefetch: prefetch enable failed, err=%d",
err);
}
pr_debug("l2x0-prefetch: %s end, prefetch_ctrl=0x%08x\n", __func__,
readl(l2x0_base + L2X0_PREFETCH_CTRL_REG));
}
static void prefetch_disable(void)
{
struct tee_operation operation;
u32 data;
int err;
int origin_err;
data = readl(l2x0_base + L2X0_PREFETCH_CTRL_REG);
pr_debug("l2x0-prefetch: %s start, preftect_ctrl=0x%08x\n", __func__,
data);
if (data & (L2X0_PREFETCH_CTRL_BIT_INST_EN |
L2X0_PREFETCH_CTRL_BIT_DATA_EN)) {
data &= ~(L2X0_PREFETCH_CTRL_BIT_INST_EN |
L2X0_PREFETCH_CTRL_BIT_DATA_EN);
operation.shm[0].buffer = &data;
operation.shm[0].size = sizeof(data);
operation.shm[0].flags = TEEC_MEM_INPUT;
operation.flags = TEEC_MEMREF_0_USED;
err = teec_invoke_command(&session,
TEE_STA_SET_L2CC_PREFETCH_CTRL_REGISTER,
&operation, &origin_err);
if (err)
pr_err("l2x0-prefetch: prefetch disable failed, err=%d",
err);
}
pr_debug("l2x0-prefetch: %s end, prefetch_ctrl=0x%08x\n", __func__,
readl(l2x0_base + L2X0_PREFETCH_CTRL_REG));
}
static int __init prefetch_ctrl_init(void)
{
int err;
int origin_err;
/* Selects trustzone application needed for the job. */
struct tee_uuid static_uuid = {
L2X0_UUID_TEE_TA_START_LOW,
L2X0_UUID_TEE_TA_START_MID,
L2X0_UUID_TEE_TA_START_HIGH,
L2X0_UUID_TEE_TA_START_CLOCKSEQ,
};
/* Get PL310 base address. It will be used as readonly. */
if (cpu_is_u5500())
l2x0_base = __io_address(U5500_L2CC_BASE);
else if (cpu_is_u8500())
l2x0_base = __io_address(U8500_L2CC_BASE);
else
ux500_unknown_soc();
err = teec_initialize_context(NULL, &context);
if (err) {
pr_err("l2x0-prefetch: unable to initialize tee context,"
" err = %d\n", err);
err = -EINVAL;
goto error0;
}
err = teec_open_session(&context, &session, &static_uuid,
TEEC_LOGIN_PUBLIC, NULL, NULL, &origin_err);
if (err) {
pr_err("l2x0-prefetch: unable to open tee session,"
" tee error = %d, origin error = %d\n",
err, origin_err);
err = -EINVAL;
goto error1;
}
outer_cache.prefetch_enable = prefetch_enable;
outer_cache.prefetch_disable = prefetch_disable;
pr_info("l2x0-prefetch: initialized.\n");
return 0;
error1:
(void)teec_finalize_context(&context);
error0:
return err;
}
static void __exit prefetch_ctrl_exit(void)
{
outer_cache.prefetch_enable = NULL;
outer_cache.prefetch_disable = NULL;
(void)teec_close_session(&session);
(void)teec_finalize_context(&context);
}
/* Wait for TEE driver to be initialized. */
late_initcall(prefetch_ctrl_init);
module_exit(prefetch_ctrl_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PL310 prefetch control");
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