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From: Anton Vorontsov on 2 Mar 2010 13:30
Currently the driver uses host->iomap to store all the iomapped BARs
of a PCI device (while AHCI devices actually use just a single memory
window).

We're going to teach AHCI to work with non-PCI buses, so there are two
options to make this work:

1. "fake" host->iomap array for non-PCI devices, and place the needed
address at iomap[AHCI_PCI_BAR];
2. Get rid of host->iomap usage, instead introduce a private mmio
field.

This patch implements the second option.

Signed-off-by: Anton Vorontsov <avorontsov(a)ru.mvista.com>
---
drivers/ata/ahci.c | 34 ++++++++++++++++++++--------------
1 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index ef7949a..4f00aea 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -281,6 +281,7 @@ struct ahci_em_priv {
};

struct ahci_host_priv {
+ void __iomem * mmio; /* bus-independant mem map */
unsigned int flags; /* AHCI_HFLAG_* */
u32 cap; /* cap to use */
u32 cap2; /* cap2 to use */
@@ -719,7 +720,8 @@ static inline int ahci_nr_ports(u32 cap)
static inline void __iomem *__ahci_port_base(struct ata_host *host,
unsigned int port_no)
{
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ struct ahci_host_priv *hpriv = host->private_data;
+ void __iomem *mmio = hpriv->mmio;

return mmio + 0x100 + (port_no * 0x80);
}
@@ -779,7 +781,8 @@ static ssize_t ahci_show_host_version(struct device *dev,
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
- void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ void __iomem *mmio = hpriv->mmio;

return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
}
@@ -812,7 +815,7 @@ static ssize_t ahci_show_port_cmd(struct device *dev,
static void ahci_save_initial_config(struct pci_dev *pdev,
struct ahci_host_priv *hpriv)
{
- void __iomem *mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 cap, cap2, vers, port_map;
int i;
int mv;
@@ -941,7 +944,7 @@ static void ahci_save_initial_config(struct pci_dev *pdev,
static void ahci_restore_initial_config(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;

writel(hpriv->saved_cap, mmio + HOST_CAP);
if (hpriv->saved_cap2)
@@ -1300,7 +1303,7 @@ static int ahci_reset_controller(struct ata_host *host)
{
struct pci_dev *pdev = to_pci_dev(host->dev);
struct ahci_host_priv *hpriv = host->private_data;
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 tmp;

/* we must be in AHCI mode, before using anything
@@ -1431,7 +1434,8 @@ static void ahci_init_sw_activity(struct ata_link *link)

static int ahci_reset_em(struct ata_host *host)
{
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ struct ahci_host_priv *hpriv = host->private_data;
+ void __iomem *mmio = hpriv->mmio;
u32 em_ctl;

em_ctl = readl(mmio + HOST_EM_CTL);
@@ -1447,7 +1451,7 @@ static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
- void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 em_ctl;
u32 message[] = {0, 0};
unsigned long flags;
@@ -1615,7 +1619,7 @@ static void ahci_init_controller(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
struct pci_dev *pdev = to_pci_dev(host->dev);
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
int i;
void __iomem *port_mmio;
u32 tmp;
@@ -2258,7 +2262,7 @@ static irqreturn_t ahci_interrupt(int irq, void *dev_instance)
VPRINTK("ENTER\n");

hpriv = host->private_data;
- mmio = host->iomap[AHCI_PCI_BAR];
+ mmio = hpriv->mmio;

/* sigh. 0xffffffff is a valid return from h/w */
irq_stat = readl(mmio + HOST_IRQ_STAT);
@@ -2347,7 +2351,8 @@ static void ahci_freeze(struct ata_port *ap)

static void ahci_thaw(struct ata_port *ap)
{
- void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ void __iomem *mmio = hpriv->mmio;
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp;
struct ahci_port_priv *pp = ap->private_data;
@@ -2443,7 +2448,7 @@ static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
struct ata_host *host = dev_get_drvdata(&pdev->dev);
struct ahci_host_priv *hpriv = host->private_data;
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 ctl;

if (mesg.event & PM_EVENT_SUSPEND &&
@@ -2592,7 +2597,7 @@ static void ahci_print_info(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
struct pci_dev *pdev = to_pci_dev(host->dev);
- void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 vers, cap, cap2, impl, speed;
const char *speed_s;
u16 cc;
@@ -3078,6 +3083,8 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if ((hpriv->flags & AHCI_HFLAG_NO_MSI) || pci_enable_msi(pdev))
pci_intx(pdev, 1);

+ hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
+
/* save initial config */
ahci_save_initial_config(pdev, hpriv);

@@ -3098,7 +3105,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)

if (ahci_em_messages && (hpriv->cap & HOST_CAP_EMS)) {
u8 messages;
- void __iomem *mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
+ void __iomem *mmio = hpriv->mmio;
u32 em_loc = readl(mmio + HOST_EM_LOC);
u32 em_ctl = readl(mmio + HOST_EM_CTL);

@@ -3142,7 +3149,6 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
if (!host)
return -ENOMEM;
- host->iomap = pcim_iomap_table(pdev);
host->private_data = hpriv;

if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
--
1.7.0

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Prev: [PATCH 1/1] perf archive: Don't try to collect files without a build-id
Next: [PATCH RFC 0/12] ahci: Add support for non-PCI devices