[ARM] pxa: make pxa2xx_spi driver use ssp_request()/ssp_free()

1. make pxa2xx_spi.c use ssp_request() and ssp_free() to get the common
   information of the designated SSP port.

2. remove those IRQ/memory request code, ssp_request() has done that for
   the driver

3. the SPI platform device is thus made psuedo, no resource (memory/IRQ)
   has to be defined, all will be retreived by ssp_request()

4. introduce ssp_get_clk_div() to handle controller difference in clock
   divisor setting

5. use clk_xxx() API for clock enable/disable, and clk_get_rate() to
   handle the different SSP clock frequency between different processors

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 53 insertions, 86 deletions

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index abf05048c638..aaaea81e412a 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -153,6 +153,7 @@ config SPI_OMAP24XX
 config SPI_PXA2XX
         tristate "PXA2xx SSP SPI master"
         depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
+        select PXA_SSP
         help
           This enables using a PXA2xx SSP port as a SPI master controller.
           The driver can be configured to use any SSP port and additional
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index 0ac0f65f69a1..eb817b8eb024 100644
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -27,6 +27,7 @@
 #include <linux/spi/spi.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -37,6 +38,7 @@
 #include <asm/arch/hardware.h>
 #include <asm/arch/pxa-regs.h>
 #include <asm/arch/regs-ssp.h>
+#include <asm/arch/ssp.h>
 #include <asm/arch/pxa2xx_spi.h>
 
 MODULE_AUTHOR("Stephen Street");
@@ -81,6 +83,9 @@ struct driver_data {
         /* Driver model hookup */
         struct platform_device *pdev;
 
+        /* SSP Info */
+        struct ssp_device *ssp;
+
         /* SPI framework hookup */
         enum pxa_ssp_type ssp_type;
         struct spi_master *master;
@@ -779,6 +784,16 @@ int set_dma_burst_and_threshold(struct chip_data *chip, struct spi_device *spi,
         return retval;
 }
 
+static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate)
+{
+        unsigned long ssp_clk = clk_get_rate(ssp->clk);
+
+        if (ssp->type == PXA25x_SSP)
+                return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
+        else
+                return ((ssp_clk / rate - 1) & 0xfff) << 8;
+}
+
 static void pump_transfers(unsigned long data)
 {
         struct driver_data *drv_data = (struct driver_data *)data;
@@ -786,6 +801,7 @@ static void pump_transfers(unsigned long data)
         struct spi_transfer *transfer = NULL;
         struct spi_transfer *previous = NULL;
         struct chip_data *chip = NULL;
+        struct ssp_device *ssp = drv_data->ssp;
         void *reg = drv_data->ioaddr;
         u32 clk_div = 0;
         u8 bits = 0;
@@ -867,12 +883,7 @@ static void pump_transfers(unsigned long data)
                 if (transfer->bits_per_word)
                         bits = transfer->bits_per_word;
 
-                if (reg == SSP1_VIRT)
-                        clk_div = SSP1_SerClkDiv(speed);
-                else if (reg == SSP2_VIRT)
-                        clk_div = SSP2_SerClkDiv(speed);
-                else if (reg == SSP3_VIRT)
-                        clk_div = SSP3_SerClkDiv(speed);
+                clk_div = ssp_get_clk_div(ssp, speed);
 
                 if (bits <= 8) {
                         drv_data->n_bytes = 1;
@@ -1075,6 +1086,7 @@ static int setup(struct spi_device *spi)
         struct pxa2xx_spi_chip *chip_info = NULL;
         struct chip_data *chip;
         struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+        struct ssp_device *ssp = drv_data->ssp;
         unsigned int clk_div;
 
         if (!spi->bits_per_word)
@@ -1158,18 +1170,7 @@ static int setup(struct spi_device *spi)
                 }
         }
 
-        if (drv_data->ioaddr == SSP1_VIRT)
-                clk_div = SSP1_SerClkDiv(spi->max_speed_hz);
-        else if (drv_data->ioaddr == SSP2_VIRT)
-                clk_div = SSP2_SerClkDiv(spi->max_speed_hz);
-        else if (drv_data->ioaddr == SSP3_VIRT)
-                clk_div = SSP3_SerClkDiv(spi->max_speed_hz);
-        else
-        {
-                dev_err(&spi->dev, "failed setup: unknown IO address=0x%p\n",
-                        drv_data->ioaddr);
-                return -ENODEV;
-        }
+        clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz);
         chip->speed_hz = spi->max_speed_hz;
 
         chip->cr0 = clk_div
@@ -1184,15 +1185,15 @@ static int setup(struct spi_device *spi)
 
         /* NOTE:  PXA25x_SSP _could_ use external clocking ... */
         if (drv_data->ssp_type != PXA25x_SSP)
-                dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+                dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d\n",
                                 spi->bits_per_word,
-                                (CLOCK_SPEED_HZ)
+                                clk_get_rate(ssp->clk)
                                         / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
                                 spi->mode & 0x3);
         else
-                dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+                dev_dbg(&spi->dev, "%d bits/word, %ld Hz, mode %d\n",
                                 spi->bits_per_word,
-                                (CLOCK_SPEED_HZ/2)
+                                clk_get_rate(ssp->clk)
                                         / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
                                 spi->mode & 0x3);
 
@@ -1324,14 +1325,14 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
         struct pxa2xx_spi_master *platform_info;
         struct spi_master *master;
         struct driver_data *drv_data = 0;
-        struct resource *memory_resource;
-        int irq;
+        struct ssp_device *ssp;
         int status = 0;
 
         platform_info = dev->platform_data;
 
-        if (platform_info->ssp_type == SSP_UNDEFINED) {
-                dev_err(&pdev->dev, "undefined SSP\n");
+        ssp = ssp_request(pdev->id, pdev->name);
+        if (ssp == NULL) {
+                dev_err(&pdev->dev, "failed to request SSP%d\n", pdev->id);
                 return -ENODEV;
         }
 
@@ -1339,12 +1340,14 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
         master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
         if (!master) {
                 dev_err(&pdev->dev, "can not alloc spi_master\n");
+                ssp_free(ssp);
                 return -ENOMEM;
         }
         drv_data = spi_master_get_devdata(master);
         drv_data->master = master;
         drv_data->master_info = platform_info;
         drv_data->pdev = pdev;
+        drv_data->ssp = ssp;
 
         master->bus_num = pdev->id;
         master->num_chipselect = platform_info->num_chipselect;
@@ -1352,21 +1355,13 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
         master->setup = setup;
         master->transfer = transfer;
 
-        drv_data->ssp_type = platform_info->ssp_type;
+        drv_data->ssp_type = ssp->type;
         drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
                                                 sizeof(struct driver_data)), 8);
 
-        /* Setup register addresses */
-        memory_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!memory_resource) {
-                dev_err(&pdev->dev, "memory resources not defined\n");
-                status = -ENODEV;
-                goto out_error_master_alloc;
-        }
-
-        drv_data->ioaddr = (void *)io_p2v((unsigned long)(memory_resource->start));
-        drv_data->ssdr_physical = memory_resource->start + 0x00000010;
-        if (platform_info->ssp_type == PXA25x_SSP) {
+        drv_data->ioaddr = ssp->mmio_base;
+        drv_data->ssdr_physical = ssp->phys_base + SSDR;
+        if (ssp->type == PXA25x_SSP) {
                 drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
                 drv_data->dma_cr1 = 0;
                 drv_data->clear_sr = SSSR_ROR;
@@ -1378,15 +1373,7 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
                 drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
         }
 
-        /* Attach to IRQ */
-        irq = platform_get_irq(pdev, 0);
-        if (irq < 0) {
-                dev_err(&pdev->dev, "irq resource not defined\n");
-                status = -ENODEV;
-                goto out_error_master_alloc;
-        }
-
-        status = request_irq(irq, ssp_int, 0, dev->bus_id, drv_data);
+        status = request_irq(ssp->irq, ssp_int, 0, dev->bus_id, drv_data);
         if (status < 0) {
                 dev_err(&pdev->dev, "can not get IRQ\n");
                 goto out_error_master_alloc;
@@ -1419,29 +1406,12 @@ static int __init pxa2xx_spi_probe(struct platform_device *pdev)
                         goto out_error_dma_alloc;
                 }
 
-                if (drv_data->ioaddr == SSP1_VIRT) {
-                                DRCMRRXSSDR = DRCMR_MAPVLD
-                                                | drv_data->rx_channel;
-                                DRCMRTXSSDR = DRCMR_MAPVLD
-                                                | drv_data->tx_channel;
-                } else if (drv_data->ioaddr == SSP2_VIRT) {
-                                DRCMRRXSS2DR = DRCMR_MAPVLD
-                                                | drv_data->rx_channel;
-                                DRCMRTXSS2DR = DRCMR_MAPVLD
-                                                | drv_data->tx_channel;
-                } else if (drv_data->ioaddr == SSP3_VIRT) {
-                                DRCMRRXSS3DR = DRCMR_MAPVLD
-                                                | drv_data->rx_channel;
-                                DRCMRTXSS3DR = DRCMR_MAPVLD
-                                                | drv_data->tx_channel;
-                } else {
-                        dev_err(dev, "bad SSP type\n");
-                        goto out_error_dma_alloc;
-                }
+                DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data->rx_channel;
+                DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data->tx_channel;
         }
 
         /* Enable SOC clock */
-        pxa_set_cken(platform_info->clock_enable, 1);
+        clk_enable(ssp->clk);
 
         /* Load default SSP configuration */
         write_SSCR0(0, drv_data->ioaddr);
@@ -1480,7 +1450,7 @@ out_error_queue_alloc:
         destroy_queue(drv_data);
 
 out_error_clock_enabled:
-        pxa_set_cken(platform_info->clock_enable, 0);
+        clk_disable(ssp->clk);
 
 out_error_dma_alloc:
         if (drv_data->tx_channel != -1)
@@ -1489,17 +1459,18 @@ out_error_dma_alloc:
                 pxa_free_dma(drv_data->rx_channel);
 
 out_error_irq_alloc:
-        free_irq(irq, drv_data);
+        free_irq(ssp->irq, drv_data);
 
 out_error_master_alloc:
         spi_master_put(master);
+        ssp_free(ssp);
         return status;
 }
 
 static int pxa2xx_spi_remove(struct platform_device *pdev)
 {
         struct driver_data *drv_data = platform_get_drvdata(pdev);
-        int irq;
+        struct ssp_device *ssp = drv_data->ssp;
         int status = 0;
 
         if (!drv_data)
@@ -1521,28 +1492,21 @@ static int pxa2xx_spi_remove(struct platform_device *pdev)
 
         /* Disable the SSP at the peripheral and SOC level */
         write_SSCR0(0, drv_data->ioaddr);
-        pxa_set_cken(drv_data->master_info->clock_enable, 0);
+        clk_disable(ssp->clk);
 
         /* Release DMA */
         if (drv_data->master_info->enable_dma) {
-                if (drv_data->ioaddr == SSP1_VIRT) {
-                        DRCMRRXSSDR = 0;
-                        DRCMRTXSSDR = 0;
-                } else if (drv_data->ioaddr == SSP2_VIRT) {
-                        DRCMRRXSS2DR = 0;
-                        DRCMRTXSS2DR = 0;
-                } else if (drv_data->ioaddr == SSP3_VIRT) {
-                        DRCMRRXSS3DR = 0;
-                        DRCMRTXSS3DR = 0;
-                }
+                DRCMR(ssp->drcmr_rx) = 0;
+                DRCMR(ssp->drcmr_tx) = 0;
                 pxa_free_dma(drv_data->tx_channel);
                 pxa_free_dma(drv_data->rx_channel);
         }
 
         /* Release IRQ */
-        irq = platform_get_irq(pdev, 0);
-        if (irq >= 0)
-                free_irq(irq, drv_data);
+        free_irq(ssp->irq, drv_data);
+
+        /* Release SSP */
+        ssp_free(ssp);
 
         /* Disconnect from the SPI framework */
         spi_unregister_master(drv_data->master);
@@ -1577,6 +1541,7 @@ static int suspend_devices(struct device *dev, void *pm_message)
 static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
 {
         struct driver_data *drv_data = platform_get_drvdata(pdev);
+        struct ssp_device *ssp = drv_data->ssp;
         int status = 0;
 
         /* Check all childern for current power state */
@@ -1589,7 +1554,7 @@ static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
         if (status != 0)
                 return status;
         write_SSCR0(0, drv_data->ioaddr);
-        pxa_set_cken(drv_data->master_info->clock_enable, 0);
+        clk_disable(ssp->clk);
 
         return 0;
 }
@@ -1597,10 +1562,11 @@ static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
 static int pxa2xx_spi_resume(struct platform_device *pdev)
 {
         struct driver_data *drv_data = platform_get_drvdata(pdev);
+        struct ssp_device *ssp = drv_data->ssp;
         int status = 0;
 
         /* Enable the SSP clock */
-        pxa_set_cken(drv_data->master_info->clock_enable, 1);
+        clk_disable(ssp->clk);
 
         /* Start the queue running */
         status = start_queue(drv_data);