// 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 , 2023 NXP
*/
#include <linux/device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/sys_soc.h>
#include <linux/fsl/mc.h>
#include "compat.h"
#include "debugfs.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_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI
#include "qi.h"
#endif
/*
* 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 |
OP_ALG_PR_ON;
/* 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 interrupt 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);
}
#ifdef CONFIG_OF
static const struct of_device_id imx8m_machine_match[] = {
{ .compatible = "fsl,imx8mm" , },
{ .compatible = "fsl,imx8mn" , },
{ .compatible = "fsl,imx8mp" , },
{ .compatible = "fsl,imx8mq" , },
{ .compatible = "fsl,imx8ulp" , },
{ }
};
#endif
/*
* 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 ||
/*
* Apparently on i . MX8M { Q , M , N , P } it doesn ' t matter if virt_en = = 1
* and the following steps should be performed regardless
*/
of_match_node(imx8m_machine_match, of_root)) {
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 occurred in the descriptor , then
* the DECO status field will be set to 0 x0D
*/
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 );
if (!timeout)
return -EAGAIN;
return 0 ;
}
/*
* deinstantiate_rng - builds and executes a descriptor on DECO0 ,
* which deinitializes the RNG block .
* @ ctrldev - pointer to device
* @ state_handle_mask - bitmask containing the instantiation status
* for the RNG4 state handles which exist in
* the RNG4 block : 1 if it ' s been instantiated
*
* Return : - 0 if no error occurred
* - - ENOMEM if there isn ' t enough memory to allocate the descriptor
* - - ENODEV if DECO0 couldn ' t be acquired
* - - EAGAIN if an error occurred when executing the descriptor
*/
static int deinstantiate_rng(struct device *ctrldev, int state_handle_mask)
{
u32 *desc, status;
int sh_idx, ret = 0 ;
desc = kmalloc(CAAM_CMD_SZ * 3 , GFP_KERNEL);
if (!desc)
return -ENOMEM;
for (sh_idx = 0 ; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
/*
* If the corresponding bit is set , then it means the state
* handle was initialized by us , and thus it needs to be
* deinitialized as well
*/
if ((1 << sh_idx) & state_handle_mask) {
/*
* Create the descriptor for deinstantating this state
* handle
*/
build_deinstantiation_desc(desc, sh_idx);
/* Try to run it through DECO0 */
ret = run_descriptor_deco0(ctrldev, desc, &status);
if (ret ||
(status && status != JRSTA_SSRC_JUMP_HALT_CC)) {
dev_err(ctrldev,
"Failed to deinstantiate RNG4 SH%d\n" ,
sh_idx);
break ;
}
dev_info(ctrldev, "Deinstantiated RNG4 SH%d\n" , sh_idx);
}
}
kfree(desc);
return ret;
}
static void devm_deinstantiate_rng(void *data)
{
struct device *ctrldev = data;
struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
/*
* De - initialize RNG state handles initialized by this driver .
* In case of SoCs with Management Complex , RNG is managed by MC f / w .
*/
if (ctrlpriv->rng4_sh_init)
deinstantiate_rng(ctrldev, ctrlpriv->rng4_sh_init);
}
/*
* instantiate_rng - builds and executes a descriptor on DECO0 ,
* which initializes the RNG block .
* @ ctrldev - pointer to device
* @ state_handle_mask - bitmask containing the instantiation status
* for the RNG4 state handles which exist in
* the RNG4 block : 1 if it ' s been instantiated
* by an external entry , 0 otherwise .
* @ gen_sk - generate data to be loaded into the JDKEK , TDKEK and TDSK ;
* Caution : this can be done only once ; if the keys need to be
* regenerated , a POR is required
*
* Return : - 0 if no error occurred
* - - ENOMEM if there isn ' t enough memory to allocate the descriptor
* - - ENODEV if DECO0 couldn ' t be acquired
* - - EAGAIN if an error occurred when executing the descriptor
* f . i . there was a RNG hardware error due to not " good enough "
* entropy being acquired .
*/
static int instantiate_rng(struct device *ctrldev, int state_handle_mask,
int gen_sk)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(ctrldev);
struct caam_ctrl __iomem *ctrl;
u32 *desc, status = 0 , rdsta_val;
int ret = 0 , sh_idx;
ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
desc = kmalloc(CAAM_CMD_SZ * 7 , GFP_KERNEL);
if (!desc)
return -ENOMEM;
for (sh_idx = 0 ; sh_idx < RNG4_MAX_HANDLES; sh_idx++) {
const u32 rdsta_if = RDSTA_IF0 << sh_idx;
const u32 rdsta_pr = RDSTA_PR0 << sh_idx;
const u32 rdsta_mask = rdsta_if | rdsta_pr;
/* Clear the contents before using the descriptor */
memset(desc, 0 x00, CAAM_CMD_SZ * 7 );
/*
* If the corresponding bit is set , this state handle
* was initialized by somebody else , so it ' s left alone .
*/
if (rdsta_if & state_handle_mask) {
if (rdsta_pr & state_handle_mask)
continue ;
dev_info(ctrldev,
"RNG4 SH%d was previously instantiated without prediction resistance. Tearing it down\n" ,
sh_idx);
ret = deinstantiate_rng(ctrldev, rdsta_if);
if (ret)
break ;
}
/* Create the descriptor for instantiating RNG State Handle */
build_instantiation_desc(desc, sh_idx, gen_sk);
/* Try to run it through DECO0 */
ret = run_descriptor_deco0(ctrldev, desc, &status);
/*
* If ret is not 0 , or descriptor status is not 0 , then
* something went wrong . No need to try the next state
* handle ( if available ) , bail out here .
* Also , if for some reason , the State Handle didn ' t get
* instantiated although the descriptor has finished
* without any error ( HW optimizations for later
* CAAM eras ) , then try again .
*/
if (ret)
break ;
rdsta_val = rd_reg32(&ctrl->r4tst[0 ].rdsta) & RDSTA_MASK;
if ((status && status != JRSTA_SSRC_JUMP_HALT_CC) ||
(rdsta_val & rdsta_mask) != rdsta_mask) {
ret = -EAGAIN;
break ;
}
dev_info(ctrldev, "Instantiated RNG4 SH%d\n" , sh_idx);
}
kfree(desc);
if (ret)
return ret;
return devm_add_action_or_reset(ctrldev, devm_deinstantiate_rng, ctrldev);
}
/*
* kick_trng - sets the various parameters for enabling the initialization
* of the RNG4 block in CAAM
* @ dev - pointer to the controller device
* @ ent_delay - Defines the length ( in system clocks ) of each entropy sample .
*/
static void kick_trng(struct device *dev, int ent_delay)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
struct caam_ctrl __iomem *ctrl;
struct rng4tst __iomem *r4tst;
u32 val, rtsdctl;
ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
r4tst = &ctrl->r4tst[0 ];
/*
* Setting both RTMCTL : PRGM and RTMCTL : TRNG_ACC causes TRNG to
* properly invalidate the entropy in the entropy register and
* force re - generation .
*/
clrsetbits_32(&r4tst->rtmctl, 0 , RTMCTL_PRGM | RTMCTL_ACC);
/*
* Performance - wise , it does not make sense to
* set the delay to a value that is lower
* than the last one that worked ( i . e . the state handles
* were instantiated properly ) .
*/
rtsdctl = rd_reg32(&r4tst->rtsdctl);
val = (rtsdctl & RTSDCTL_ENT_DLY_MASK) >> RTSDCTL_ENT_DLY_SHIFT;
if (ent_delay > val) {
val = ent_delay;
/* min. freq. count, equal to 1/4 of the entropy sample length */
wr_reg32(&r4tst->rtfrqmin, val >> 2 );
/* disable maximum frequency count */
wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
}
wr_reg32(&r4tst->rtsdctl, (val << RTSDCTL_ENT_DLY_SHIFT) |
RTSDCTL_SAMP_SIZE_VAL);
/*
* To avoid reprogramming the self - test parameters over and over again ,
* use RTSDCTL [ SAMP_SIZE ] as an indicator .
*/
if ((rtsdctl & RTSDCTL_SAMP_SIZE_MASK) != RTSDCTL_SAMP_SIZE_VAL) {
wr_reg32(&r4tst->rtscmisc, (2 << 16 ) | 32 );
wr_reg32(&r4tst->rtpkrrng, 570 );
wr_reg32(&r4tst->rtpkrmax, 1600 );
wr_reg32(&r4tst->rtscml, (122 << 16 ) | 317 );
wr_reg32(&r4tst->rtscrl[0 ], (80 << 16 ) | 107 );
wr_reg32(&r4tst->rtscrl[1 ], (57 << 16 ) | 62 );
wr_reg32(&r4tst->rtscrl[2 ], (39 << 16 ) | 39 );
wr_reg32(&r4tst->rtscrl[3 ], (27 << 16 ) | 26 );
wr_reg32(&r4tst->rtscrl[4 ], (19 << 16 ) | 18 );
wr_reg32(&r4tst->rtscrl[5 ], (18 << 16 ) | 17 );
}
/*
* select raw sampling in both entropy shifter
* and statistical checker ; ; put RNG4 into run mode
*/
clrsetbits_32(&r4tst->rtmctl, RTMCTL_PRGM | RTMCTL_ACC,
RTMCTL_SAMP_MODE_RAW_ES_SC);
}
static int caam_get_era_from_hw(struct caam_perfmon __iomem *perfmon)
{
static const struct {
u16 ip_id;
u8 maj_rev;
u8 era;
} id[] = {
{0 x0A10, 1 , 1 },
{0 x0A10, 2 , 2 },
{0 x0A12, 1 , 3 },
{0 x0A14, 1 , 3 },
{0 x0A14, 2 , 4 },
{0 x0A16, 1 , 4 },
{0 x0A10, 3 , 4 },
{0 x0A11, 1 , 4 },
{0 x0A18, 1 , 4 },
{0 x0A11, 2 , 5 },
{0 x0A12, 2 , 5 },
{0 x0A13, 1 , 5 },
{0 x0A1C, 1 , 5 }
};
u32 ccbvid, id_ms;
u8 maj_rev, era;
u16 ip_id;
int i;
ccbvid = rd_reg32(&perfmon->ccb_id);
era = (ccbvid & CCBVID_ERA_MASK) >> CCBVID_ERA_SHIFT;
if (era) /* This is '0' prior to CAAM ERA-6 */
return era;
id_ms = rd_reg32(&perfmon->caam_id_ms);
ip_id = (id_ms & SECVID_MS_IPID_MASK) >> SECVID_MS_IPID_SHIFT;
maj_rev = (id_ms & SECVID_MS_MAJ_REV_MASK) >> SECVID_MS_MAJ_REV_SHIFT;
for (i = 0 ; i < ARRAY_SIZE(id); i++)
if (id[i].ip_id == ip_id && id[i].maj_rev == maj_rev)
return id[i].era;
return -ENOTSUPP;
}
/**
* caam_get_era ( ) - Return the ERA of the SEC on SoC , based
* on " sec - era " optional property in the DTS . This property is updated
* by u - boot .
* In case this property is not passed an attempt to retrieve the CAAM
* era via register reads will be made .
*
* @ perfmon : Performance Monitor Registers
*/
static int caam_get_era(struct caam_perfmon __iomem *perfmon)
{
struct device_node *caam_node;
int ret;
u32 prop;
caam_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0" );
ret = of_property_read_u32(caam_node, "fsl,sec-era" , &prop);
of_node_put(caam_node);
if (!ret)
return prop;
else
return caam_get_era_from_hw(perfmon);
}
/*
* ERRATA : imx6 devices ( imx6D , imx6Q , imx6DL , imx6S , imx6DP and imx6QP )
* have an issue wherein AXI bus transactions may not occur in the correct
* order . This isn ' t a problem running single descriptors , but can be if
* running multiple concurrent descriptors . Reworking the driver to throttle
* to single requests is impractical , thus the workaround is to limit the AXI
* pipeline to a depth of 1 ( from it ' s default of 4 ) to preclude this situation
* from occurring .
*/
static void handle_imx6_err005766(u32 __iomem *mcr)
{
if (of_machine_is_compatible("fsl,imx6q" ) ||
of_machine_is_compatible("fsl,imx6dl" ) ||
of_machine_is_compatible("fsl,imx6qp" ))
clrsetbits_32(mcr, MCFGR_AXIPIPE_MASK,
1 << MCFGR_AXIPIPE_SHIFT);
}
static const struct of_device_id caam_match[] = {
{
.compatible = "fsl,sec-v4.0" ,
},
{
.compatible = "fsl,sec4.0" ,
},
{},
};
MODULE_DEVICE_TABLE(of, caam_match);
struct caam_imx_data {
bool page0_access;
const struct clk_bulk_data *clks;
int num_clks;
};
static const struct clk_bulk_data caam_imx6_clks[] = {
{ .id = "ipg" },
{ .id = "mem" },
{ .id = "aclk" },
{ .id = "emi_slow" },
};
static const struct caam_imx_data caam_imx6_data = {
.page0_access = true ,
.clks = caam_imx6_clks,
.num_clks = ARRAY_SIZE(caam_imx6_clks),
};
static const struct clk_bulk_data caam_imx7_clks[] = {
{ .id = "ipg" },
{ .id = "aclk" },
};
static const struct caam_imx_data caam_imx7_data = {
.page0_access = true ,
.clks = caam_imx7_clks,
.num_clks = ARRAY_SIZE(caam_imx7_clks),
};
static const struct clk_bulk_data caam_imx6ul_clks[] = {
{ .id = "ipg" },
{ .id = "mem" },
{ .id = "aclk" },
};
static const struct caam_imx_data caam_imx6ul_data = {
.page0_access = true ,
.clks = caam_imx6ul_clks,
.num_clks = ARRAY_SIZE(caam_imx6ul_clks),
};
static const struct clk_bulk_data caam_vf610_clks[] = {
{ .id = "ipg" },
};
static const struct caam_imx_data caam_vf610_data = {
.page0_access = true ,
.clks = caam_vf610_clks,
.num_clks = ARRAY_SIZE(caam_vf610_clks),
};
static const struct caam_imx_data caam_imx8ulp_data;
static const struct soc_device_attribute caam_imx_soc_table[] = {
{ .soc_id = "i.MX6UL" , .data = &caam_imx6ul_data },
{ .soc_id = "i.MX6*" , .data = &caam_imx6_data },
{ .soc_id = "i.MX7*" , .data = &caam_imx7_data },
{ .soc_id = "i.MX8M*" , .data = &caam_imx7_data },
{ .soc_id = "i.MX8ULP" , .data = &caam_imx8ulp_data },
{ .soc_id = "i.MX8Q*" , .data = &caam_imx8ulp_data },
{ .soc_id = "VF*" , .data = &caam_vf610_data },
{ .family = "Freescale i.MX" },
{ /* sentinel */ }
};
static void disable_clocks(void *data)
{
struct caam_drv_private *ctrlpriv = data;
clk_bulk_disable_unprepare(ctrlpriv->num_clks, ctrlpriv->clks);
}
static int init_clocks(struct device *dev, const struct caam_imx_data *data)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
int ret;
ctrlpriv->num_clks = data->num_clks;
ctrlpriv->clks = devm_kmemdup(dev, data->clks,
data->num_clks * sizeof (data->clks[0 ]),
GFP_KERNEL);
if (!ctrlpriv->clks)
return -ENOMEM;
ret = devm_clk_bulk_get(dev, ctrlpriv->num_clks, ctrlpriv->clks);
if (ret) {
dev_err(dev,
"Failed to request all necessary clocks\n" );
return ret;
}
ret = clk_bulk_prepare_enable(ctrlpriv->num_clks, ctrlpriv->clks);
if (ret) {
dev_err(dev,
"Failed to prepare/enable all necessary clocks\n" );
return ret;
}
return devm_add_action_or_reset(dev, disable_clocks, ctrlpriv);
}
static void caam_remove_debugfs(void *root)
{
debugfs_remove_recursive(root);
}
#ifdef CONFIG_FSL_MC_BUS
static bool check_version(struct fsl_mc_version *mc_version, u32 major,
u32 minor, u32 revision)
{
if (mc_version->major > major)
return true ;
if (mc_version->major == major) {
if (mc_version->minor > minor)
return true ;
if (mc_version->minor == minor &&
mc_version->revision > revision)
return true ;
}
return false ;
}
#endif
static bool needs_entropy_delay_adjustment(void )
{
if (of_machine_is_compatible("fsl,imx6sx" ))
return true ;
return false ;
}
static int caam_ctrl_rng_init(struct device *dev)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
int ret, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
u8 rng_vid;
if (ctrlpriv->era < 10 ) {
struct caam_perfmon __iomem *perfmon;
perfmon = ctrlpriv->total_jobrs ?
(struct caam_perfmon __iomem *)&ctrlpriv->jr[0 ]->perfmon :
(struct caam_perfmon __iomem *)&ctrl->perfmon;
rng_vid = (rd_reg32(&perfmon->cha_id_ls) &
CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT;
} else {
struct version_regs __iomem *vreg;
vreg = ctrlpriv->total_jobrs ?
(struct version_regs __iomem *)&ctrlpriv->jr[0 ]->vreg :
(struct version_regs __iomem *)&ctrl->vreg;
rng_vid = (rd_reg32(&vreg->rng) & CHA_VER_VID_MASK) >>
CHA_VER_VID_SHIFT;
}
/*
* If SEC has RNG version > = 4 and RNG state handle has not been
* already instantiated , do RNG instantiation
* In case of SoCs with Management Complex , RNG is managed by MC f / w .
*/
if (!(ctrlpriv->mc_en && ctrlpriv->pr_support) && rng_vid >= 4 ) {
ctrlpriv->rng4_sh_init =
rd_reg32(&ctrl->r4tst[0 ].rdsta);
/*
* If the secure keys ( TDKEK , JDKEK , TDSK ) , were already
* generated , signal this to the function that is instantiating
* the state handles . An error would occur if RNG4 attempts
* to regenerate these keys before the next POR .
*/
gen_sk = ctrlpriv->rng4_sh_init & RDSTA_SKVN ? 0 : 1 ;
ctrlpriv->rng4_sh_init &= RDSTA_MASK;
do {
int inst_handles =
rd_reg32(&ctrl->r4tst[0 ].rdsta) & RDSTA_MASK;
/*
* If either SH were instantiated by somebody else
* ( e . g . u - boot ) then it is assumed that the entropy
* parameters are properly set and thus the function
* setting these ( kick_trng ( . . . ) ) is skipped .
* Also , if a handle was instantiated , do not change
* the TRNG parameters .
*/
if (needs_entropy_delay_adjustment())
ent_delay = 12000 ;
if (!inst_handles) {
dev_info(dev,
"Entropy delay = %u\n" ,
ent_delay);
kick_trng(dev, ent_delay);
ent_delay = ent_delay * 2 ;
}
/*
* if instantiate_rng ( . . . ) fails , the loop will rerun
* and the kick_trng ( . . . ) function will modify the
* upper and lower limits of the entropy sampling
* interval , leading to a successful initialization of
* the RNG .
*/
ret = instantiate_rng(dev, inst_handles,
gen_sk);
/*
* Entropy delay is determined via TRNG characterization .
* TRNG characterization is run across different voltages
* and temperatures .
* If worst case value for ent_dly is identified ,
* the loop can be skipped for that platform .
*/
if (needs_entropy_delay_adjustment())
break ;
if (ret == -EAGAIN)
/*
* if here , the loop will rerun ,
* so don ' t hog the CPU
*/
cpu_relax();
} while ((ret == -EAGAIN) && (ent_delay < RTSDCTL_ENT_DLY_MAX));
if (ret) {
dev_err(dev, "failed to instantiate RNG" );
return ret;
}
/*
* Set handles initialized by this module as the complement of
* the already initialized ones
*/
ctrlpriv->rng4_sh_init = ~ctrlpriv->rng4_sh_init & RDSTA_MASK;
/* Enable RDB bit so that RNG works faster */
clrsetbits_32(&ctrl->scfgr, 0 , SCFGR_RDBENABLE);
}
return 0 ;
}
/* Indicate if the internal state of the CAAM is lost during PM */
static int caam_off_during_pm(void )
{
bool not_off_during_pm = of_machine_is_compatible("fsl,imx6q" ) ||
of_machine_is_compatible("fsl,imx6qp" ) ||
of_machine_is_compatible("fsl,imx6dl" );
return not_off_during_pm ? 0 : 1 ;
}
static void caam_state_save(struct device *dev)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
struct caam_ctl_state *state = &ctrlpriv->state;
struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
u32 deco_inst, jr_inst;
int i;
state->mcr = rd_reg32(&ctrl->mcr);
state->scfgr = rd_reg32(&ctrl->scfgr);
deco_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) &
CHA_ID_MS_DECO_MASK) >> CHA_ID_MS_DECO_SHIFT;
for (i = 0 ; i < deco_inst; i++) {
state->deco_mid[i].liodn_ms =
rd_reg32(&ctrl->deco_mid[i].liodn_ms);
state->deco_mid[i].liodn_ls =
rd_reg32(&ctrl->deco_mid[i].liodn_ls);
}
jr_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) &
CHA_ID_MS_JR_MASK) >> CHA_ID_MS_JR_SHIFT;
for (i = 0 ; i < jr_inst; i++) {
state->jr_mid[i].liodn_ms =
rd_reg32(&ctrl->jr_mid[i].liodn_ms);
state->jr_mid[i].liodn_ls =
rd_reg32(&ctrl->jr_mid[i].liodn_ls);
}
}
static void caam_state_restore(const struct device *dev)
{
const struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
const struct caam_ctl_state *state = &ctrlpriv->state;
struct caam_ctrl __iomem *ctrl = ctrlpriv->ctrl;
u32 deco_inst, jr_inst;
int i;
wr_reg32(&ctrl->mcr, state->mcr);
wr_reg32(&ctrl->scfgr, state->scfgr);
deco_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) &
CHA_ID_MS_DECO_MASK) >> CHA_ID_MS_DECO_SHIFT;
for (i = 0 ; i < deco_inst; i++) {
wr_reg32(&ctrl->deco_mid[i].liodn_ms,
state->deco_mid[i].liodn_ms);
wr_reg32(&ctrl->deco_mid[i].liodn_ls,
state->deco_mid[i].liodn_ls);
}
jr_inst = (rd_reg32(&ctrl->perfmon.cha_num_ms) &
CHA_ID_MS_JR_MASK) >> CHA_ID_MS_JR_SHIFT;
for (i = 0 ; i < jr_inst; i++) {
wr_reg32(&ctrl->jr_mid[i].liodn_ms,
state->jr_mid[i].liodn_ms);
wr_reg32(&ctrl->jr_mid[i].liodn_ls,
state->jr_mid[i].liodn_ls);
}
if (ctrlpriv->virt_en == 1 )
clrsetbits_32(&ctrl->jrstart, 0 , JRSTART_JR0_START |
JRSTART_JR1_START | JRSTART_JR2_START |
JRSTART_JR3_START);
}
static int caam_ctrl_suspend(struct device *dev)
{
const struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
if (ctrlpriv->caam_off_during_pm && !ctrlpriv->no_page0)
caam_state_save(dev);
return 0 ;
}
static int caam_ctrl_resume(struct device *dev)
{
struct caam_drv_private *ctrlpriv = dev_get_drvdata(dev);
int ret = 0 ;
if (ctrlpriv->caam_off_during_pm && !ctrlpriv->no_page0) {
caam_state_restore(dev);
/* HW and rng will be reset so deinstantiation can be removed */
devm_remove_action(dev, devm_deinstantiate_rng, dev);
ret = caam_ctrl_rng_init(dev);
}
return ret;
}
static DEFINE_SIMPLE_DEV_PM_OPS(caam_ctrl_pm_ops, caam_ctrl_suspend, caam_ctrl_resume);
/* Probe routine for CAAM top (controller) level */
static int caam_probe(struct platform_device *pdev)
{
int ret, ring;
u64 caam_id;
const struct soc_device_attribute *imx_soc_match;
struct device *dev;
struct device_node *nprop, *np;
struct caam_ctrl __iomem *ctrl;
struct caam_drv_private *ctrlpriv;
struct caam_perfmon __iomem *perfmon;
struct dentry *dfs_root;
u32 scfgr, comp_params;
int pg_size;
int BLOCK_OFFSET = 0 ;
bool reg_access = true ;
const struct caam_imx_data *imx_soc_data;
ctrlpriv = devm_kzalloc(&pdev->dev, sizeof (*ctrlpriv), GFP_KERNEL);
if (!ctrlpriv)
return -ENOMEM;
dev = &pdev->dev;
dev_set_drvdata(dev, ctrlpriv);
nprop = pdev->dev.of_node;
imx_soc_match = soc_device_match(caam_imx_soc_table);
if (!imx_soc_match && of_match_node(imx8m_machine_match, of_root))
return -EPROBE_DEFER;
caam_imx = (bool )imx_soc_match;
ctrlpriv->caam_off_during_pm = caam_imx && caam_off_during_pm();
if (imx_soc_match) {
/*
* Until Layerscape and i . MX OP - TEE get in sync ,
* only i . MX OP - TEE use cases disallow access to
* caam page 0 ( controller ) registers .
*/
np = of_find_compatible_node(NULL, NULL, "linaro,optee-tz" );
ctrlpriv->optee_en = !!np;
of_node_put(np);
reg_access = !ctrlpriv->optee_en;
if (!imx_soc_match->data) {
dev_err(dev, "No clock data provided for i.MX SoC" );
return -EINVAL;
}
imx_soc_data = imx_soc_match->data;
reg_access = reg_access && imx_soc_data->page0_access;
ctrlpriv->no_page0 = !reg_access;
/*
* CAAM clocks cannot be controlled from kernel .
*/
if (!imx_soc_data->num_clks)
goto iomap_ctrl;
ret = init_clocks(dev, imx_soc_match->data);
if (ret)
return ret;
}
iomap_ctrl:
/* Get configuration properties from device tree */
/* First, get register page */
ctrl = devm_of_iomap(dev, nprop, 0 , NULL);
ret = PTR_ERR_OR_ZERO(ctrl);
if (ret) {
dev_err(dev, "caam: of_iomap() failed\n" );
return ret;
}
ring = 0 ;
for_each_available_child_of_node(nprop, np)
if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring" ) ||
of_device_is_compatible(np, "fsl,sec4.0-job-ring" )) {
u32 reg;
if (of_property_read_u32_index(np, "reg" , 0 , ®)) {
dev_err(dev, "%s read reg property error\n" ,
np->full_name);
continue ;
}
ctrlpriv->jr[ring] = (struct caam_job_ring __iomem __force *)
((__force uint8_t *)ctrl + reg);
ctrlpriv->total_jobrs++;
ring++;
}
/*
* Wherever possible , instead of accessing registers from the global page ,
* use the alias registers in the first ( cf . DT nodes order )
* job ring ' s page .
*/
perfmon = ring ? (struct caam_perfmon __iomem *)&ctrlpriv->jr[0 ]->perfmon :
(struct caam_perfmon __iomem *)&ctrl->perfmon;
caam_little_end = !(bool )(rd_reg32(&perfmon->status) &
(CSTA_PLEND | CSTA_ALT_PLEND));
comp_params = rd_reg32(&perfmon->comp_parms_ms);
if (reg_access && comp_params & CTPR_MS_PS &&
rd_reg32(&ctrl->mcr) & MCFGR_LONG_PTR)
caam_ptr_sz = sizeof (u64);
else
caam_ptr_sz = sizeof (u32);
caam_dpaa2 = !!(comp_params & CTPR_MS_DPAA2);
ctrlpriv->qi_present = !!(comp_params & CTPR_MS_QI_MASK);
#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI
/* If (DPAA 1.x) QI present, check whether dependencies are available */
if (ctrlpriv->qi_present && !caam_dpaa2) {
ret = qman_is_probed();
if (!ret) {
return -EPROBE_DEFER;
} else if (ret < 0 ) {
dev_err(dev, "failing probe due to qman probe error\n" );
return -ENODEV;
}
ret = qman_portals_probed();
if (!ret) {
return -EPROBE_DEFER;
} else if (ret < 0 ) {
dev_err(dev, "failing probe due to qman portals probe error\n" );
return -ENODEV;
}
}
#endif
/* Allocating the BLOCK_OFFSET based on the supported page size on
* the platform
*/
pg_size = (comp_params & CTPR_MS_PG_SZ_MASK) >> CTPR_MS_PG_SZ_SHIFT;
if (pg_size == 0 )
BLOCK_OFFSET = PG_SIZE_4K;
else
BLOCK_OFFSET = PG_SIZE_64K;
ctrlpriv->ctrl = (struct caam_ctrl __iomem __force *)ctrl;
ctrlpriv->assure = (struct caam_assurance __iomem __force *)
((__force uint8_t *)ctrl +
BLOCK_OFFSET * ASSURE_BLOCK_NUMBER
);
ctrlpriv->deco = (struct caam_deco __iomem __force *)
((__force uint8_t *)ctrl +
BLOCK_OFFSET * DECO_BLOCK_NUMBER
);
/* Get the IRQ of the controller (for security violations only) */
ctrlpriv->secvio_irq = irq_of_parse_and_map(nprop, 0 );
np = of_find_compatible_node(NULL, NULL, "fsl,qoriq-mc" );
ctrlpriv->mc_en = !!np;
of_node_put(np);
#ifdef CONFIG_FSL_MC_BUS
if (ctrlpriv->mc_en) {
struct fsl_mc_version *mc_version;
mc_version = fsl_mc_get_version();
if (mc_version)
ctrlpriv->pr_support = check_version(mc_version, 10 , 20 ,
0 );
else
return -EPROBE_DEFER;
}
#endif
if (!reg_access)
goto set_dma_mask;
/*
* Enable DECO watchdogs and , if this is a PHYS_ADDR_T_64BIT kernel ,
* long pointers in master configuration register .
* In case of SoCs with Management Complex , MC f / w performs
* the configuration .
*/
if (!ctrlpriv->mc_en)
clrsetbits_32(&ctrl->mcr, MCFGR_AWCACHE_MASK,
MCFGR_AWCACHE_CACH | MCFGR_AWCACHE_BUFF |
MCFGR_WDENABLE | MCFGR_LARGE_BURST);
handle_imx6_err005766(&ctrl->mcr);
/*
* Read the Compile Time parameters and SCFGR to determine
* if virtualization is enabled for this platform
*/
scfgr = rd_reg32(&ctrl->scfgr);
ctrlpriv->virt_en = 0 ;
if (comp_params & CTPR_MS_VIRT_EN_INCL) {
/* VIRT_EN_INCL = 1 & VIRT_EN_POR = 1 or
* VIRT_EN_INCL = 1 & VIRT_EN_POR = 0 & SCFGR_VIRT_EN = 1
*/
if ((comp_params & CTPR_MS_VIRT_EN_POR) ||
(!(comp_params & CTPR_MS_VIRT_EN_POR) &&
(scfgr & SCFGR_VIRT_EN)))
ctrlpriv->virt_en = 1 ;
} else {
/* VIRT_EN_INCL = 0 && VIRT_EN_POR_VALUE = 1 */
if (comp_params & CTPR_MS_VIRT_EN_POR)
ctrlpriv->virt_en = 1 ;
}
if (ctrlpriv->virt_en == 1 )
clrsetbits_32(&ctrl->jrstart, 0 , JRSTART_JR0_START |
JRSTART_JR1_START | JRSTART_JR2_START |
JRSTART_JR3_START);
set_dma_mask:
ret = dma_set_mask_and_coherent(dev, caam_get_dma_mask(dev));
if (ret) {
dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n" , ret);
return ret;
}
ctrlpriv->era = caam_get_era(perfmon);
ctrlpriv->domain = iommu_get_domain_for_dev(dev);
dfs_root = debugfs_create_dir(dev_name(dev), NULL);
if (IS_ENABLED(CONFIG_DEBUG_FS)) {
ret = devm_add_action_or_reset(dev, caam_remove_debugfs,
dfs_root);
if (ret)
return ret;
}
caam_debugfs_init(ctrlpriv, perfmon, dfs_root);
/* Check to see if (DPAA 1.x) QI present. If so, enable */
if (ctrlpriv->qi_present && !caam_dpaa2) {
ctrlpriv->qi = (struct caam_queue_if __iomem __force *)
((__force uint8_t *)ctrl +
BLOCK_OFFSET * QI_BLOCK_NUMBER
);
/* This is all that's required to physically enable QI */
wr_reg32(&ctrlpriv->qi->qi_control_lo, QICTL_DQEN);
/* If QMAN driver is present, init CAAM-QI backend */
#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI
ret = caam_qi_init(pdev);
if (ret)
dev_err(dev, "caam qi i/f init failed: %d\n" , ret);
#endif
}
/* If no QI and no rings specified, quit and go home */
if ((!ctrlpriv->qi_present) && (!ctrlpriv->total_jobrs)) {
dev_err(dev, "no queues configured, terminating\n" );
return -ENOMEM;
}
comp_params = rd_reg32(&perfmon->comp_parms_ls);
ctrlpriv->blob_present = !!(comp_params & CTPR_LS_BLOB);
/*
* Some SoCs like the LS1028A ( non - E ) indicate CTPR_LS_BLOB support ,
* but fail when actually using it due to missing AES support , so
* check both here .
*/
if (ctrlpriv->era < 10 ) {
ctrlpriv->blob_present = ctrlpriv->blob_present &&
(rd_reg32(&perfmon->cha_num_ls) & CHA_ID_LS_AES_MASK);
} else {
struct version_regs __iomem *vreg;
vreg = ctrlpriv->total_jobrs ?
(struct version_regs __iomem *)&ctrlpriv->jr[0 ]->vreg :
(struct version_regs __iomem *)&ctrl->vreg;
ctrlpriv->blob_present = ctrlpriv->blob_present &&
(rd_reg32(&vreg->aesa) & CHA_VER_MISC_AES_NUM_MASK);
}
if (reg_access) {
ret = caam_ctrl_rng_init(dev);
if (ret)
return ret;
}
caam_id = (u64)rd_reg32(&perfmon->caam_id_ms) << 32 |
(u64)rd_reg32(&perfmon->caam_id_ls);
/* Report "alive" for developer to see */
dev_info(dev, "device ID = 0x%016llx (Era %d)\n" , caam_id,
ctrlpriv->era);
dev_info(dev, "job rings = %d, qi = %d\n" ,
ctrlpriv->total_jobrs, ctrlpriv->qi_present);
ret = devm_of_platform_populate(dev);
if (ret)
dev_err(dev, "JR platform devices creation error\n" );
return ret;
}
static struct platform_driver caam_driver = {
.driver = {
.name = "caam" ,
.of_match_table = caam_match,
.pm = pm_ptr(&caam_ctrl_pm_ops),
},
.probe = caam_probe,
};
module_platform_driver(caam_driver);
MODULE_LICENSE("GPL" );
MODULE_DESCRIPTION("FSL CAAM request backend" );
MODULE_AUTHOR("Freescale Semiconductor - NMG/STC" );
Messung V0.5 in Prozent C=94 H=96 G=94
¤ Dauer der Verarbeitung: 0.17 Sekunden
(vorverarbeitet am 2026-09-29)
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