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Subject[PATCH 04/11] spi/pxa2xx: embed the ssp_device to platform data
Date
The spi-pxa2xx-pci glue driver had to implement pxa_ssp_request()/free() in
order to support the spi-pxa2xx platform driver. Since the ACPI enabled
platforms can use the same platform driver we would need to implement
pxa_ssp_request()/free() in some central place that can be shared by the
ACPI and PCI glue code.

Instead of doing that we can make pxa_ssp_request()/free() to be available
only when CONFIG_ARCH_PXA is set. On other arches these are being stubbed
out in preference to passing the ssp_device from the platform data
directly.

We also change the SPI bus number to be taken from ssp->port_id instead of
platform device id. This way the supporting code that passes the ssp can
decide the number (or it can set it to the same as pdev->id).

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
drivers/spi/spi-pxa2xx-pci.c | 73 +++-------------------------------------
drivers/spi/spi-pxa2xx.c | 15 ++++++---
include/linux/pxa2xx_ssp.h | 9 +++++
include/linux/spi/pxa2xx_spi.h | 3 ++
4 files changed, 28 insertions(+), 72 deletions(-)

diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
index ece979e..364964d 100644
--- a/drivers/spi/spi-pxa2xx-pci.c
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -8,55 +8,11 @@
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>

-struct ce4100_info {
- struct ssp_device ssp;
- struct platform_device *spi_pdev;
-};
-
-static DEFINE_MUTEX(ssp_lock);
-static LIST_HEAD(ssp_list);
-
-struct ssp_device *pxa_ssp_request(int port, const char *label)
-{
- struct ssp_device *ssp = NULL;
-
- mutex_lock(&ssp_lock);
-
- list_for_each_entry(ssp, &ssp_list, node) {
- if (ssp->port_id == port && ssp->use_count == 0) {
- ssp->use_count++;
- ssp->label = label;
- break;
- }
- }
-
- mutex_unlock(&ssp_lock);
-
- if (&ssp->node == &ssp_list)
- return NULL;
-
- return ssp;
-}
-EXPORT_SYMBOL_GPL(pxa_ssp_request);
-
-void pxa_ssp_free(struct ssp_device *ssp)
-{
- mutex_lock(&ssp_lock);
- if (ssp->use_count) {
- ssp->use_count--;
- ssp->label = NULL;
- } else
- dev_err(&ssp->pdev->dev, "device already free\n");
- mutex_unlock(&ssp_lock);
-}
-EXPORT_SYMBOL_GPL(pxa_ssp_free);
-
static int ce4100_spi_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
struct platform_device_info pi;
int ret;
- struct ce4100_info *spi_info;
struct platform_device *pdev;
struct pxa2xx_spi_master spi_pdata;
struct ssp_device *ssp;
@@ -69,14 +25,10 @@ static int ce4100_spi_probe(struct pci_dev *dev,
if (!ret)
return ret;

- spi_info = devm_kzalloc(&dev->dev, sizeof(*spi_info), GFP_KERNEL);
- if (!spi_info)
- return -ENOMEM;
-
memset(&spi_pdata, 0, sizeof(spi_pdata));
spi_pdata.num_chipselect = dev->devfn;

- ssp = &spi_info->ssp;
+ ssp = &spi_pdata.ssp;
ssp->phys_base = pci_resource_start(dev, 0);
ssp->mmio_base = pcim_iomap_table(dev)[0];
if (!ssp->mmio_base) {
@@ -87,10 +39,6 @@ static int ce4100_spi_probe(struct pci_dev *dev,
ssp->port_id = dev->devfn;
ssp->type = PXA25x_SSP;

- mutex_lock(&ssp_lock);
- list_add(&ssp->node, &ssp_list);
- mutex_unlock(&ssp_lock);
-
memset(&pi, 0, sizeof(pi));
pi.parent = &dev->dev;
pi.name = "pxa2xx-spi";
@@ -99,30 +47,19 @@ static int ce4100_spi_probe(struct pci_dev *dev,
pi.size_data = sizeof(spi_pdata);

pdev = platform_device_register_full(&pi);
- if (!pdev) {
- mutex_lock(&ssp_lock);
- list_del(&ssp->node);
- mutex_unlock(&ssp_lock);
-
+ if (!pdev)
return -ENOMEM;
- }

- spi_info->spi_pdev = pdev;
- pci_set_drvdata(dev, spi_info);
+ pci_set_drvdata(dev, pdev);

return 0;
}

static void ce4100_spi_remove(struct pci_dev *dev)
{
- struct ce4100_info *spi_info = pci_get_drvdata(dev);
- struct ssp_device *ssp = &spi_info->ssp;
-
- platform_device_unregister(spi_info->spi_pdev);
+ struct platform_device *pdev = pci_get_drvdata(dev);

- mutex_lock(&ssp_lock);
- list_del(&ssp->node);
- mutex_unlock(&ssp_lock);
+ platform_device_unregister(pdev);
}

static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index ad842eb..17bd136 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -1374,11 +1374,18 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
struct ssp_device *ssp;
int status;

- platform_info = dev->platform_data;
+ platform_info = dev_get_platdata(dev);
+ if (!platform_info) {
+ dev_err(&pdev->dev, "missing platform data\n");
+ return -ENODEV;
+ }

ssp = pxa_ssp_request(pdev->id, pdev->name);
- if (ssp == NULL) {
- dev_err(&pdev->dev, "failed to request SSP%d\n", pdev->id);
+ if (!ssp)
+ ssp = &platform_info->ssp;
+
+ if (!ssp->mmio_base) {
+ dev_err(&pdev->dev, "failed to get ssp\n");
return -ENODEV;
}

@@ -1400,7 +1407,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

- master->bus_num = pdev->id;
+ master->bus_num = ssp->port_id;
master->num_chipselect = platform_info->num_chipselect;
master->dma_alignment = DMA_ALIGNMENT;
master->cleanup = cleanup;
diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/pxa2xx_ssp.h
index f366320..065e7f6 100644
--- a/include/linux/pxa2xx_ssp.h
+++ b/include/linux/pxa2xx_ssp.h
@@ -206,6 +206,15 @@ static inline u32 pxa_ssp_read_reg(struct ssp_device *dev, u32 reg)
return __raw_readl(dev->mmio_base + reg);
}

+#ifdef CONFIG_ARCH_PXA
struct ssp_device *pxa_ssp_request(int port, const char *label);
void pxa_ssp_free(struct ssp_device *);
+#else
+static inline struct ssp_device *pxa_ssp_request(int port, const char *label)
+{
+ return NULL;
+}
+static inline void pxa_ssp_free(struct ssp_device *ssp) {}
+#endif
+
#endif
diff --git a/include/linux/spi/pxa2xx_spi.h b/include/linux/spi/pxa2xx_spi.h
index c73d144..6b99f09 100644
--- a/include/linux/spi/pxa2xx_spi.h
+++ b/include/linux/spi/pxa2xx_spi.h
@@ -28,6 +28,9 @@ struct pxa2xx_spi_master {
u32 clock_enable;
u16 num_chipselect;
u8 enable_dma;
+
+ /* For non-PXA arches */
+ struct ssp_device ssp;
};

/* spi_board_info.controller_data for SPI slave devices,
--
1.7.10.4


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