// SPDX-License-Identifier: GPL-2.0+
/* * CAAM control-plane driver backend
* Controller-level driver, kernel property detection, initialization
*
* Copyright 2008-2012 Freescale Semiconductor, Inc.
* Copyright 2018-2019 NXP
*/
#include <linux/device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/sys_soc.h>
#include "compat.h"
#include "regs.h"
#include "intern.h"
#include "jr.h"
#include "desc_constr.h"
#include "ctrl.h"
bool caam_dpaa2;
EXPORT_SYMBOL(caam_dpaa2);
#ifdef CONFIG_CAAM_QI
#include "qi.h"
#endif
/*
* i.MX targets tend to have clock control subsystems that can
* enable/disable clocking to our device.
*/
static inline struct clk *caam_drv_identify_clk(struct device *dev,
char *clk_name)
{
return caam_imx ? devm_clk_get(dev, clk_name) : NULL;
}
/*
* Descriptor to instantiate RNG State Handle 0 in normal mode and
* load the JDKEK, TDKEK and TDSK registers
*/
static void build_instantiation_desc(u32 *desc, int handle, int do_sk)
{
u32 *jump_cmd, op_flags;
init_job_desc(desc, 0);
op_flags = OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
(handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INIT;
/* INIT RNG in non-test mode */
append_operation(desc, op_flags);
if (!handle && do_sk) {
/*
* For SH0, Secure Keys must be generated as well
*/
/* wait for done */
jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
set_jump_tgt_here(desc, jump_cmd);
/*
* load 1 to clear written reg:
* resets the done interrrupt and returns the RNG to idle.
*/
append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
/* Initialize State Handle */
append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
OP_ALG_AAI_RNG4_SK);
}
append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
}
/* Descriptor for deinstantiation of State Handle 0 of the RNG block. */
static void build_deinstantiation_desc(u32 *desc, int handle)
{
init_job_desc(desc, 0);
/* Uninstantiate State Handle 0 */
append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
(handle << OP_ALG_AAI_SHIFT) | OP_ALG_AS_INITFINAL);
append_jump(desc, JUMP_CLASS_CLASS1 | JUMP_TYPE_HALT);
}
/*
* run_descriptor_deco0 - runs a descriptor on DECO0, under direct control of
* the software (no JR/QI used).
* @ctrldev - pointer to device
* @status - descriptor status, after being run
*
* Return: - 0 if no error occurred
* - -ENODEV if the DECO couldn't be acquired
* - -EAGAIN if an error occurred while executing the descriptor
*/
static inline int run_descriptor_deco0(struct device *ctrldev, u32 *desc,
u32 *status)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
struct caam_deco __iomem *deco = ctrlpriv->deco;
unsigned int timeout = 100000;
u32 deco_dbg_reg, deco_state, flags;
int i;
if (ctrlpriv->virt_en == 1) {
clrsetbits_32(&ctrl->deco_rsr, 0, DECORSR_JR0);
while (!(rd_reg32(&ctrl->deco_rsr) & DECORSR_VALID) &&
--timeout)
cpu_relax();
timeout = 100000;
}
clrsetbits_32(&ctrl->deco_rq, 0, DECORR_RQD0ENABLE);
while (!(rd_reg32(&ctrl->deco_rq) & DECORR_DEN0) &&
--timeout)
cpu_relax();
if (!timeout) {
dev_err(ctrldev, "failed to acquire DECO 0\n");
clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0);
return -ENODEV;
}
for (i = 0; i < desc_len(desc); i++)
wr_reg32(&deco->descbuf[i], caam32_to_cpu(*(desc + i)));
flags = DECO_JQCR_WHL;
/*
* If the descriptor length is longer than 4 words, then the
* FOUR bit in JRCTRL register must be set.
*/
if (desc_len(desc) >= 4)
flags |= DECO_JQCR_FOUR;
/* Instruct the DECO to execute it */
clrsetbits_32(&deco->jr_ctl_hi, 0, flags);
timeout = 10000000;
do {
deco_dbg_reg = rd_reg32(&deco->desc_dbg);
if (ctrlpriv->era < 10)
deco_state = (deco_dbg_reg & DESC_DBG_DECO_STAT_MASK) >>
DESC_DBG_DECO_STAT_SHIFT;
else
deco_state = (rd_reg32(&deco->dbg_exec) &
DESC_DER_DECO_STAT_MASK) >>
DESC_DER_DECO_STAT_SHIFT;
/*
* If an error occured in the descriptor, then
* the DECO status field will be set to 0x0D
*/
if (deco_state == DECO_STAT_HOST_ERR)
break;
cpu_relax();
} while ((deco_dbg_reg & DESC_DBG_DECO_STAT_VALID) && --timeout);
*status = rd_reg32(&deco->op_status_hi) &
DECO_OP_STATUS_HI_ERR_MASK;
if (ctrlpriv->virt_en == 1)
clrsetbits_32(&ctrl->deco_rsr, DECORSR_JR0, 0);
/* Mark the DECO as free */
clrsetbits_32(&ctrl->deco_rq, DECORR_RQD0ENABLE, 0);