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Message-ID: <c6421ed2-1c7d-e84b-6d6d-c2562b5c1970@kernel.org>
Date: Fri, 23 Dec 2022 15:22:00 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Md Danish Anwar <a0501179@...com>,
MD Danish Anwar <danishanwar@...com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>
Cc: Suman Anna <s-anna@...com>, "Andrew F . Davis" <afd@...com>,
nm@...com, vigneshr@...com, srk@...com,
linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v12 5/6] remoteproc: pru: Add pru_rproc_set_ctable()
function
Hi Danish,
On 23/12/2022 12:58, Md Danish Anwar wrote:
> Hi Roger,
>
> Can you please review this patch.
I am the author of that patch so my review tag will be kind or worthless. ;)
cheers,
-roger
>
> Thanks,
> Danish.
>
> On 16/12/22 11:03, MD Danish Anwar wrote:
>> From: Roger Quadros <rogerq@...com>
>>
>> Some firmwares expect the OS drivers to configure the CTABLE
>> entries publishing dynamically allocated memory regions. For
>> example, the PRU Ethernet firmwares use the C28 and C30 entries
>> for retrieving the Shared RAM and System SRAM (OCMC) areas
>> allocated by the PRU Ethernet client driver.
>>
>> Provide a way for users to do that through a new API,
>> pru_rproc_set_ctable(). The API returns 0 on success and
>> a negative value on error.
>>
>> NOTE:
>> The programmable CTABLE entries are typically re-programmed by
>> the PRU firmwares when dealing with a certain block of memory
>> during block processing. This API provides an interface to the
>> PRU client drivers to publish a dynamically allocated memory
>> block with the PRU firmware using a CTABLE entry instead of a
>> negotiated address in shared memory. Additional synchronization
>> may be needed between the PRU client drivers and firmwares if
>> different addresses needs to be published at run-time reusing
>> the same CTABLE entry.
>>
>> CTABLE for stands for "constant table".
>> Each CTable entry just holds the upper address bits so PRU can
>> reference to external memory with larger address bits.
>>
>> For use case please see
>> prueth_sw_emac_config() in "drivers/net/ethernet/ti/prueth_switch.c"
>>
>> /* Set in constant table C28 of PRUn to ICSS Shared memory */
>> pru_rproc_set_ctable(prueth->pru0, PRU_C28, sharedramaddr);
>> pru_rproc_set_ctable(prueth->pru1, PRU_C28, sharedramaddr);
>>
>> /* Set in constant table C30 of PRUn to OCMC memory */
>> pru_rproc_set_ctable(prueth->pru0, PRU_C30, ocmcaddr);
>> pru_rproc_set_ctable(prueth->pru1, PRU_C30, ocmcaddr);
>>
>> Signed-off-by: Andrew F. Davis <afd@...com>
>> Signed-off-by: Suman Anna <s-anna@...com>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>> ---
>> drivers/remoteproc/pru_rproc.c | 59 ++++++++++++++++++++++++++++++++++
>> include/linux/pruss.h | 22 +++++++++++++
>> 2 files changed, 81 insertions(+)
>>
>> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
>> index 8e2fbe392ef3..176186882acf 100644
>> --- a/drivers/remoteproc/pru_rproc.c
>> +++ b/drivers/remoteproc/pru_rproc.c
>> @@ -120,6 +120,7 @@ struct pru_private_data {
>> * @mapped_irq: virtual interrupt numbers of created fw specific mapping
>> * @pru_interrupt_map: pointer to interrupt mapping description (firmware)
>> * @pru_interrupt_map_sz: pru_interrupt_map size
>> + * @rmw_lock: lock for read, modify, write operations on registers
>> * @dbg_single_step: debug state variable to set PRU into single step mode
>> * @dbg_continuous: debug state variable to restore PRU execution mode
>> * @evt_count: number of mapped events
>> @@ -137,6 +138,7 @@ struct pru_rproc {
>> unsigned int *mapped_irq;
>> struct pru_irq_rsc *pru_interrupt_map;
>> size_t pru_interrupt_map_sz;
>> + spinlock_t rmw_lock;
>> u32 dbg_single_step;
>> u32 dbg_continuous;
>> u8 evt_count;
>> @@ -153,6 +155,23 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
>> writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
>> }
>>
>> +static inline
>> +void pru_control_set_reg(struct pru_rproc *pru, unsigned int reg,
>> + u32 mask, u32 set)
>> +{
>> + u32 val;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&pru->rmw_lock, flags);
>> +
>> + val = pru_control_read_reg(pru, reg);
>> + val &= ~mask;
>> + val |= (set & mask);
>> + pru_control_write_reg(pru, reg, val);
>> +
>> + spin_unlock_irqrestore(&pru->rmw_lock, flags);
>> +}
>> +
>> static struct rproc *__pru_rproc_get(struct device_node *np, int index)
>> {
>> struct rproc *rproc;
>> @@ -269,6 +288,45 @@ void pru_rproc_put(struct rproc *rproc)
>> }
>> EXPORT_SYMBOL_GPL(pru_rproc_put);
>>
>> +/**
>> + * pru_rproc_set_ctable() - set the constant table index for the PRU
>> + * @rproc: the rproc instance of the PRU
>> + * @c: constant table index to set
>> + * @addr: physical address to set it to
>> + *
>> + * Return: 0 on success, or errno in error case.
>> + */
>> +int pru_rproc_set_ctable(struct rproc *rproc, enum pru_ctable_idx c, u32 addr)
>> +{
>> + struct pru_rproc *pru = rproc->priv;
>> + unsigned int reg;
>> + u32 mask, set;
>> + u16 idx;
>> + u16 idx_mask;
>> +
>> + if (IS_ERR_OR_NULL(rproc))
>> + return -EINVAL;
>> +
>> + if (!rproc->dev.parent || !is_pru_rproc(rproc->dev.parent))
>> + return -ENODEV;
>> +
>> + /* pointer is 16 bit and index is 8-bit so mask out the rest */
>> + idx_mask = (c >= PRU_C28) ? 0xFFFF : 0xFF;
>> +
>> + /* ctable uses bit 8 and upwards only */
>> + idx = (addr >> 8) & idx_mask;
>> +
>> + /* configurable ctable (i.e. C24) starts at PRU_CTRL_CTBIR0 */
>> + reg = PRU_CTRL_CTBIR0 + 4 * (c >> 1);
>> + mask = idx_mask << (16 * (c & 1));
>> + set = idx << (16 * (c & 1));
>> +
>> + pru_control_set_reg(pru, reg, mask, set);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(pru_rproc_set_ctable);
>> +
>> static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
>> {
>> return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
>> @@ -940,6 +998,7 @@ static int pru_rproc_probe(struct platform_device *pdev)
>> pru->rproc = rproc;
>> pru->fw_name = fw_name;
>> pru->client_np = NULL;
>> + spin_lock_init(&pru->rmw_lock);
>> mutex_init(&pru->lock);
>>
>> for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
>> diff --git a/include/linux/pruss.h b/include/linux/pruss.h
>> index 6ea737e995e9..a6bc3df92fee 100644
>> --- a/include/linux/pruss.h
>> +++ b/include/linux/pruss.h
>> @@ -28,13 +28,29 @@ enum pruss_pru_id {
>> PRUSS_NUM_PRUS,
>> };
>>
>> +/*
>> + * enum pru_ctable_idx - Configurable Constant table index identifiers
>> + */
>> +enum pru_ctable_idx {
>> + PRU_C24 = 0,
>> + PRU_C25,
>> + PRU_C26,
>> + PRU_C27,
>> + PRU_C28,
>> + PRU_C29,
>> + PRU_C30,
>> + PRU_C31,
>> +};
>> +
>> struct device_node;
>> +struct rproc;
>>
>> #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
>>
>> struct rproc *pru_rproc_get(struct device_node *np, int index,
>> enum pruss_pru_id *pru_id);
>> void pru_rproc_put(struct rproc *rproc);
>> +int pru_rproc_set_ctable(struct rproc *rproc, enum pru_ctable_idx c, u32 addr);
>>
>> #else
>>
>> @@ -46,6 +62,12 @@ pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id)
>>
>> static inline void pru_rproc_put(struct rproc *rproc) { }
>>
>> +static inline int pru_rproc_set_ctable(struct rproc *rproc,
>> + enum pru_ctable_idx c, u32 addr)
>> +{
>> + return -EOPNOTSUPP;
>> +}
>> +
>> #endif /* CONFIG_PRU_REMOTEPROC */
>>
>> static inline bool is_pru_rproc(struct device *dev)
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