Re: [PATCH v7 6/6] spmi: pmic-arb: Add multi bus support

From: Abel Vesa
Date: Tue Apr 02 2024 - 04:51:16 EST

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In reply to: Neil Armstrong: "Re: [PATCH v7 6/6] spmi: pmic-arb: Add multi bus support"
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On 24-04-02 10:25:52, Neil Armstrong wrote:
> Hi Abel,
>
> On 29/03/2024 19:54, Abel Vesa wrote:
> > Starting with HW version 7, there are actually two separate buses
> > (with two separate sets of wires). So add support for the second bus.
> > The first platform that needs this support for the second bus is the
> > Qualcomm X1 Elite, so add the compatible for it as well.
> >
> > Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
> > ---
> > drivers/spmi/spmi-pmic-arb.c | 138 +++++++++++++++++++++++++++++++++++++------
> > 1 file changed, 120 insertions(+), 18 deletions(-)
> >
> > diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
> > index 19ff8665f3d9..56f2b3190d82 100644
> > --- a/drivers/spmi/spmi-pmic-arb.c
> > +++ b/drivers/spmi/spmi-pmic-arb.c
> > @@ -13,6 +13,7 @@
> > #include <linux/kernel.h>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > +#include <linux/of_address.h>
> > #include <linux/of_irq.h>
> > #include <linux/platform_device.h>
> > #include <linux/slab.h>
> > @@ -95,6 +96,8 @@ enum pmic_arb_channel {
> > PMIC_ARB_CHANNEL_OBS,
> > };
> > +#define PMIC_ARB_MAX_BUSES 2
> > +
> > /* Maximum number of support PMIC peripherals */
> > #define PMIC_ARB_MAX_PERIPHS 512
> > #define PMIC_ARB_MAX_PERIPHS_V7 1024
> > @@ -148,6 +151,7 @@ struct spmi_pmic_arb;
> > * @min_apid: minimum APID (used for bounding IRQ search)
> > * @max_apid: maximum APID
> > * @irq: PMIC ARB interrupt.
> > + * @id: unique ID of the bus
> > */
> > struct spmi_pmic_arb_bus {
> > struct spmi_pmic_arb *pmic_arb;
> > @@ -165,6 +169,7 @@ struct spmi_pmic_arb_bus {
> > u16 min_apid;
> > u16 max_apid;
> > int irq;
> > + u8 id;
> > };
> > /**
> > @@ -179,7 +184,8 @@ struct spmi_pmic_arb_bus {
> > * @ee: the current Execution Environment
> > * @ver_ops: version dependent operations.
> > * @max_periphs: Number of elements in apid_data[]
> > - * @bus: per arbiter bus instance
> > + * @buses: per arbiter buses instances
> > + * @buses_available: number of buses registered
> > */
> > struct spmi_pmic_arb {
> > void __iomem *rd_base;
> > @@ -191,7 +197,8 @@ struct spmi_pmic_arb {
> > u8 ee;
> > const struct pmic_arb_ver_ops *ver_ops;
> > int max_periphs;
> > - struct spmi_pmic_arb_bus *bus;
> > + struct spmi_pmic_arb_bus *buses[PMIC_ARB_MAX_BUSES];
> > + int buses_available;
> > };
> > /**
> > @@ -219,7 +226,7 @@ struct spmi_pmic_arb {
> > struct pmic_arb_ver_ops {
> > const char *ver_str;
> > int (*get_core_resources)(struct platform_device *pdev, void __iomem *core);
> > - int (*init_apid)(struct spmi_pmic_arb_bus *bus);
> > + int (*init_apid)(struct spmi_pmic_arb_bus *bus, int index);
> > int (*ppid_to_apid)(struct spmi_pmic_arb_bus *bus, u16 ppid);
> > /* spmi commands (read_cmd, write_cmd, cmd) functionality */
> > int (*offset)(struct spmi_pmic_arb_bus *bus, u8 sid, u16 addr,
> > @@ -308,8 +315,8 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
> > }
> > if (status & PMIC_ARB_STATUS_FAILURE) {
> > - dev_err(&ctrl->dev, "%s: %#x %#x: transaction failed (%#x)\n",
> > - __func__, sid, addr, status);
> > + dev_err(&ctrl->dev, "%s: %#x %#x: transaction failed (%#x) reg: 0x%x\n",
> > + __func__, sid, addr, status, offset);
> > WARN_ON(1);
> > return -EIO;
> > }
> > @@ -325,8 +332,8 @@ static int pmic_arb_wait_for_done(struct spmi_controller *ctrl,
> > udelay(1);
> > }
> > - dev_err(&ctrl->dev, "%s: %#x %#x: timeout, status %#x\n",
> > - __func__, sid, addr, status);
> > + dev_err(&ctrl->dev, "%s: %#x %#x %#x: timeout, status %#x\n",
> > + __func__, bus->id, sid, addr, status);
> > return -ETIMEDOUT;
> > }
> > @@ -1005,11 +1012,17 @@ static int pmic_arb_get_core_resources_v1(struct platform_device *pdev,
> > return 0;
> > }
> > -static int pmic_arb_init_apid_v1(struct spmi_pmic_arb_bus *bus)
> > +static int pmic_arb_init_apid_v1(struct spmi_pmic_arb_bus *bus, int index)
> > {
> > struct spmi_pmic_arb *pmic_arb = bus->pmic_arb;
> > u32 *mapping_table;
> > + if (index) {
> > + dev_err(&bus->spmic->dev, "Unsupported buses count %d detected\n",
> > + index);
> > + return -EINVAL;
> > + }
>
> Shouldn't be here
>

You're right. Since the DT bindings for HW < v7 doesn't allow multi bus
support, this check is not needed. Will drop.

> > +
> > mapping_table = devm_kcalloc(&bus->spmic->dev, pmic_arb->max_periphs,
> > sizeof(*mapping_table), GFP_KERNEL);
> > if (!mapping_table)
> > @@ -1252,11 +1265,17 @@ static int pmic_arb_offset_v2(struct spmi_pmic_arb_bus *bus, u8 sid, u16 addr,
> > return 0x1000 * pmic_arb->ee + 0x8000 * apid;
> > }
> > -static int pmic_arb_init_apid_v5(struct spmi_pmic_arb_bus *bus)
> > +static int pmic_arb_init_apid_v5(struct spmi_pmic_arb_bus *bus, int index)
> > {
> > struct spmi_pmic_arb *pmic_arb = bus->pmic_arb;
> > int ret;
> > + if (index) {
> > + dev_err(&bus->spmic->dev, "Unsupported buses count %d detected\n",
> > + index);
> > + return -EINVAL;
> > + }
>
> Shouldn't be here
>

Ditto.

> > +
> > bus->base_apid = 0;
> > bus->apid_count = readl_relaxed(pmic_arb->core + PMIC_ARB_FEATURES) &
> > PMIC_ARB_FEATURES_PERIPH_MASK;
> > @@ -1328,6 +1347,50 @@ static int pmic_arb_get_core_resources_v7(struct platform_device *pdev,
> > return pmic_arb_get_obsrvr_chnls_v2(pdev);
> > }
> > +/*
> > + * Only v7 supports 2 buses. Each bus will get a different apid count, read
> > + * from different registers.
> > + */
> > +static int pmic_arb_init_apid_v7(struct spmi_pmic_arb_bus *bus, int index)
> > +{
> > + struct spmi_pmic_arb *pmic_arb = bus->pmic_arb;
> > + int ret;
> > +
> > + if (index == 0) {
> > + bus->base_apid = 0;
> > + bus->apid_count = readl_relaxed(pmic_arb->core + PMIC_ARB_FEATURES) &
> > + PMIC_ARB_FEATURES_PERIPH_MASK;
> > + } else if (index == 1) {
> > + bus->base_apid = readl_relaxed(pmic_arb->core + PMIC_ARB_FEATURES) &
> > + PMIC_ARB_FEATURES_PERIPH_MASK;
> > + bus->apid_count = readl_relaxed(pmic_arb->core + PMIC_ARB_FEATURES1) &
> > + PMIC_ARB_FEATURES_PERIPH_MASK;
> > + } else {
> > + dev_err(&bus->spmic->dev, "Unsupported buses count %d detected\n",
> > + bus->id);
> > + return -EINVAL;
> > + }
> > +
> > + if (bus->base_apid + bus->apid_count > pmic_arb->max_periphs) {
> > + dev_err(&bus->spmic->dev, "Unsupported APID count %d detected\n",
> > + bus->base_apid + bus->apid_count);
> > + return -EINVAL;
> > + }
> > +
> > + ret = pmic_arb_init_apid_min_max(bus);
> > + if (ret)
> > + return ret;
> > +
> > + ret = pmic_arb_read_apid_map_v5(bus);
> > + if (ret) {
> > + dev_err(&bus->spmic->dev, "could not read APID->PPID mapping table, rc= %d\n",
> > + ret);
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
>
> Shouldn't be here
>

Since the apid base and count are different between buses and since v7
supports 2 buses, we need a v7 specific init_apid. So this one is
needed.

> > +
> > /*
> > * v7 offset per ee and per apid for observer channels and per apid for
> > * read/write channels.
> > @@ -1580,7 +1643,7 @@ static const struct pmic_arb_ver_ops pmic_arb_v5 = {
> > static const struct pmic_arb_ver_ops pmic_arb_v7 = {
> > .ver_str = "v7",
> > .get_core_resources = pmic_arb_get_core_resources_v7,
> > - .init_apid = pmic_arb_init_apid_v5,
> > + .init_apid = pmic_arb_init_apid_v7,
>
> Shouldn't be here
>

See above.

> > .ppid_to_apid = pmic_arb_ppid_to_apid_v5,
> > .non_data_cmd = pmic_arb_non_data_cmd_v2,
> > .offset = pmic_arb_offset_v7,
> > @@ -1604,6 +1667,7 @@ static int spmi_pmic_arb_bus_init(struct platform_device *pdev,
> > struct device_node *node,
> > struct spmi_pmic_arb *pmic_arb)
> > {
> > + int bus_index = pmic_arb->buses_available;
> > struct spmi_pmic_arb_bus *bus;
> > struct device *dev = &pdev->dev;
> > struct spmi_controller *ctrl;
> > @@ -1622,7 +1686,7 @@ static int spmi_pmic_arb_bus_init(struct platform_device *pdev,
> > bus = spmi_controller_get_drvdata(ctrl);
> > - pmic_arb->bus = bus;
> > + pmic_arb->buses[bus_index] = bus;
> > bus->ppid_to_apid = devm_kcalloc(dev, PMIC_ARB_MAX_PPID,
> > sizeof(*bus->ppid_to_apid),
> > @@ -1665,12 +1729,13 @@ static int spmi_pmic_arb_bus_init(struct platform_device *pdev,
> > bus->cnfg = cnfg;
> > bus->irq = irq;
> > bus->spmic = ctrl;
> > + bus->id = bus_index;
> > - ret = pmic_arb->ver_ops->init_apid(bus);
> > + ret = pmic_arb->ver_ops->init_apid(bus, bus_index);
> > if (ret)
> > return ret;
> > - dev_dbg(&pdev->dev, "adding irq domain\n");
> > + dev_dbg(&pdev->dev, "adding irq domain for bus %d\n", bus_index);
> > bus->domain = irq_domain_add_tree(dev->of_node,
> > &pmic_arb_irq_domain_ops, bus);
> > @@ -1683,14 +1748,53 @@ static int spmi_pmic_arb_bus_init(struct platform_device *pdev,
> > pmic_arb_chained_irq, bus);
> > ctrl->dev.of_node = node;
> > + dev_set_name(&ctrl->dev, "spmi-%d", bus_index);
> > ret = devm_spmi_controller_add(dev, ctrl);
> > if (ret)
> > return ret;
> > + pmic_arb->buses_available++;
> > +
> > return 0;
> > }
> > +static int spmi_pmic_arb_register_buses(struct spmi_pmic_arb *pmic_arb,
> > + struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *node = dev->of_node;
> > + struct device_node *child;
> > + int ret;
> > +
> > + /* legacy mode doesn't provide child node for the bus */
> > + if (of_device_is_compatible(node, "qcom,spmi-pmic-arb"))
> > + return spmi_pmic_arb_bus_init(pdev, node, pmic_arb);
> > +
> > + for_each_available_child_of_node(node, child) {
> > + if (of_node_name_eq(child, "spmi")) {
> > + ret = spmi_pmic_arb_bus_init(pdev, child, pmic_arb);
> > + if (ret)
> > + return ret;
> > + }
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static void spmi_pmic_arb_deregister_buses(struct spmi_pmic_arb *pmic_arb)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < PMIC_ARB_MAX_BUSES; i++) {
> > + struct spmi_pmic_arb_bus *bus = pmic_arb->buses[i];
> > +
> > + irq_set_chained_handler_and_data(bus->irq,
> > + NULL, NULL);
> > + irq_domain_remove(bus->domain);
> > + }
> > +}
> > +
> > static int spmi_pmic_arb_probe(struct platform_device *pdev)
> > {
> > struct spmi_pmic_arb *pmic_arb;
> > @@ -1761,21 +1865,19 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
> > pmic_arb->ee = ee;
> > - return spmi_pmic_arb_bus_init(pdev, dev->of_node, pmic_arb);
> > + return spmi_pmic_arb_register_buses(pmic_arb, pdev);
> > }
> > static void spmi_pmic_arb_remove(struct platform_device *pdev)
> > {
> > struct spmi_pmic_arb *pmic_arb = platform_get_drvdata(pdev);
> > - struct spmi_pmic_arb_bus *bus = pmic_arb->bus;
> > - irq_set_chained_handler_and_data(bus->irq,
> > - NULL, NULL);
> > - irq_domain_remove(bus->domain);
> > + spmi_pmic_arb_deregister_buses(pmic_arb);
> > }
> > static const struct of_device_id spmi_pmic_arb_match_table[] = {
> > { .compatible = "qcom,spmi-pmic-arb", },
> > + { .compatible = "qcom,x1e80100-spmi-pmic-arb", },
> > {},
> > };
> > MODULE_DEVICE_TABLE(of, spmi_pmic_arb_match_table);
> >
>
> With issues fixed, it looks fine.
>
> Thanks,
> Neil

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