diff options
Diffstat (limited to 'drivers/dma/ste_dma40.c')
| -rw-r--r-- | drivers/dma/ste_dma40.c | 72 |
1 files changed, 26 insertions, 46 deletions
diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 35b078d688d5..2797f64e5e48 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -13,6 +13,7 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/err.h> +#include <linux/amba/bus.h> #include <plat/ste_dma40.h> @@ -44,9 +45,6 @@ #define D40_ALLOC_PHY (1 << 30) #define D40_ALLOC_LOG_FREE 0 -/* Hardware designer of the block */ -#define D40_HW_DESIGNER 0x8 - /** * enum 40_command - The different commands and/or statuses. * @@ -2525,25 +2523,6 @@ static int __init d40_phy_res_init(struct d40_base *base) static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) { - static const struct d40_reg_val dma_id_regs[] = { - /* Peripheral Id */ - { .reg = D40_DREG_PERIPHID0, .val = 0x0040}, - { .reg = D40_DREG_PERIPHID1, .val = 0x0000}, - /* - * D40_DREG_PERIPHID2 Depends on HW revision: - * DB8500ed has 0x0008, - * ? has 0x0018, - * DB8500v1 has 0x0028 - * DB8500v2 has 0x0038 - */ - { .reg = D40_DREG_PERIPHID3, .val = 0x0000}, - - /* PCell Id */ - { .reg = D40_DREG_CELLID0, .val = 0x000d}, - { .reg = D40_DREG_CELLID1, .val = 0x00f0}, - { .reg = D40_DREG_CELLID2, .val = 0x0005}, - { .reg = D40_DREG_CELLID3, .val = 0x00b1} - }; struct stedma40_platform_data *plat_data; struct clk *clk = NULL; void __iomem *virtbase = NULL; @@ -2552,8 +2531,9 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) int num_log_chans = 0; int num_phy_chans; int i; - u32 val; - u32 rev; + u32 pid; + u32 cid; + u8 rev; clk = clk_get(&pdev->dev, NULL); @@ -2577,32 +2557,32 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) if (!virtbase) goto failure; - /* HW version check */ - for (i = 0; i < ARRAY_SIZE(dma_id_regs); i++) { - if (dma_id_regs[i].val != - readl(virtbase + dma_id_regs[i].reg)) { - d40_err(&pdev->dev, - "Unknown hardware! Expected 0x%x at 0x%x but got 0x%x\n", - dma_id_regs[i].val, - dma_id_regs[i].reg, - readl(virtbase + dma_id_regs[i].reg)); - goto failure; - } - } - - /* Get silicon revision and designer */ - val = readl(virtbase + D40_DREG_PERIPHID2); + /* This is just a regular AMBA PrimeCell ID actually */ + for (pid = 0, i = 0; i < 4; i++) + pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i) + & 255) << (i * 8); + for (cid = 0, i = 0; i < 4; i++) + cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i) + & 255) << (i * 8); - if ((val & D40_DREG_PERIPHID2_DESIGNER_MASK) != - D40_HW_DESIGNER) { + if (cid != AMBA_CID) { + d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n"); + goto failure; + } + if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) { d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n", - val & D40_DREG_PERIPHID2_DESIGNER_MASK, - D40_HW_DESIGNER); + AMBA_MANF_BITS(pid), + AMBA_VENDOR_ST); goto failure; } - - rev = (val & D40_DREG_PERIPHID2_REV_MASK) >> - D40_DREG_PERIPHID2_REV_POS; + /* + * HW revision: + * DB8500ed has revision 0 + * ? has revision 1 + * DB8500v1 has revision 2 + * DB8500v2 has revision 3 + */ + rev = AMBA_REV_BITS(pid); /* The number of physical channels on this HW */ num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4; |